Some standard content:
Chemical Industry Standard of the People's Republic of China
HG/T2250-91
Iron Oxide Black Pigment
Published on November 12, 1991
Ministry of Chemical Industry of the People's Republic of China
Implementation on July 1, 1992
Chemical Industry Standard of the People's Republic of China
Iron Oxide Black Pigment
This standard adopts the international standard ISO1248-1974 "Iron Oxide Pigments for Paints". 1 Subject Content and Scope of Application
HG/T2250-91
This standard specifies the technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of iron oxide black pigments. This standard applies to iron oxide black pigments made by the interaction of trivalent iron and divalent iron. It is mainly used in coatings, inks, construction and other industries.
Molecular formula: Fe30
Relative molecular mass: 231.54 (according to the international relative atomic mass in 1987) 2 Reference standards
Preparation of standard solutions for titration analysis (volume analysis) of chemical reagents GB601
GB603 Preparation of preparations and products used in chemical reagent test methods GB1715
GB1717
GB1864
Determination of pigment sieve residue
Determination of pH value of pigment aqueous suspension
Comparison of pigment colors||tt ||GB5211.13
GB5211.15
GB5211.19
Determination of water-soluble pigments by hot extraction method
Determination of volatile pigments at 105°C
Determination of pH of aqueous extract of pigments
Determination of oil absorption of pigments
Determination of relative tinting strength and diluted color of coloring pigmentsGB6682
Laboratory water specifications
GB9285
3Product model
Sampling of raw materials for paints and varnishes
HE 01—01.
4Technical requirements
The technical indicators of black iron oxide should meet the requirements in the following table. Item
Iron content [expressed as Fe:0.(105℃ drying)], %105℃ volatile matter, %
Approved by the Ministry of Chemical Industry of the People's Republic of China on 1991-11-12>
Visual comparison method
Qualified products
Implemented on 1992-07-01
Water-soluble matter, %
Sieve residue (45um sieve), %
pH of water extract, mL
Water suspension pH value
Oil absorption + g/100g
Total calcium content (expressed as Cao), %
Color 1).2) (Compared with standard sample)
Relative tinting strength 1) (Compared with standard sample), %
Presence of organic coloring matter
HG/T2250-91
Approximately ~ slightly
Note: 1) The standard sample provider of "color" and "relative tinting strength" is Shiyan Iron Oxide Yellow Pigment Factory. 2) When the hue of the "color" item is the same, the sample is brighter than the standard sample, and the color difference is "slightly" grade, which can be used as a first-class product. 5 Test method
Qualified products
All reagents used should be analytically pure reagents, and the third-grade water specified in GB6682 or water of corresponding purity should be used. 5.1 Determination of iron content
5.1.1 Principle of the method
According to the principle of redox reaction, the iron content is titrated with potassium dichromate standard titration solution. 5.1.2 Reagents and materials
5.1.2.1 Hydrochloric acid (GB622) solution: 1+1 solution. 5.1.2.2 Stannous chloride SnCl2 (GB638) solution: 100g/L hydrochloric acid solution. Weigh 50g stannous chloride (SnCl2) and dissolve it in 300mL hydrochloric acid (GB622), and dilute it to 500mL with water. Place this clear solution in a sealed bottle and add a small amount of metal tin particles. 5.1.2.3 Mercuric chloride (I) (HG3-1068) saturated solution: 60100g/L. 5.1.2.4 Sulfuric acid and phosphoric acid mixture: Take 150mL of sulfuric acid (GB625) and 150mL of phosphoric acid (GB1282) and mix them in 500mL of water, and dilute to 1L.
Barium diphenylamine sulfonate solution: Dissolve 1g of barium diphenylamine sulfonate in 100mL of sulfuric acid (GB625). Potassium dichromate standard titration solution: c(
K2Cr20z)=0.1mol/L. Accurately weigh 4.9035g of potassium dichromate that has been dried at 150℃ in advance and dissolve it in water, and dilute to 1L.
5.1.3 Instruments and equipment
5.1.3.1 Balance: Sensitivity 0.0001g.
5.1.3.2 Conical flask: 500mL.
5.1.3.3 Oven: 150±2℃.
5.1.3.4 Electric furnace.
5.1.4 Analysis steps
5.1.4.1 Sample
Weigh 0.3g of the sample that has been dried in advance (105±2℃) to an accuracy of 0.0001g. 5.1.4.2 Determination
HG/T2250—91
Put the sample in a 500mL conical flask, add 30mL of hydrochloric acid (5.1.2.1), and heat to completely dissolve it. In order to promote the dissolution of the sample, a few drops of stannous chloride (5.1.2.2) can be added while heating, but be careful not to add too much to cause the solution color to disappear. Continue to heat the above solution to a slight boil, slowly add stannous chloride (5.1.2.2) while shaking until the solution just turns colorless, then add 1-2 drops in excess, cool the flask to room temperature under running water, add 200 mL of cold water to dilute, then add 15 mL of saturated solution of mercuric chloride (1) (5.1.2.3), shake vigorously until a slightly white precipitate appears, add 50 mL of sulfuric acid and phosphoric acid mixed solution (5.1.2.4) and 3 drops of diphenylamine barium sulfonate solution (5.1.2.5) after 1 minute, slowly titrate with potassium dichromate standard titration solution, and the end point is when the color changes from dark green to purple. The titration should be started no more than 3 minutes after the addition of the mercuric chloride (I) solution. 5.1.5 Result Expression
Calculate with ferroferric oxide (Fe3O2 mass percentage X, expressed as formula 1): X,-·010. 077 17×100V·X7.717m1
Wherein: V1—the amount of potassium dichromate standard titration solution, mL; Ci——the actual concentration of potassium dichromate standard titration solution, mol/L, m1—the mass of the sample, g,
0.07717——the mass of ferroferric oxide equivalent to 1.00mL potassium dichromate standard titration solution (cKCr20)=1.000mol/LJ, expressed in grams.
Take the average of two determinations and keep one decimal place. 5.1.6 Allowable Difference
The relative error of two parallel determinations shall not be greater than 0.2%. 5.2 Determination of volatile matter at 105℃
Perform according to the provisions of GB5211.3.
5.3 Determination of water-soluble matter
Perform according to the provisions of GB5211.2. Sample weight is 5g. 5.4 Determination of sieve residue
Perform according to the provisions of Method A in GB1715.
5.5 Determination of pH value of water extract
Perform according to the provisions of 3.2.1 in GB5211.13. 5.6 Determination of pH value of water suspension
Perform according to the provisions of GB1717. Sample weight is 5g. 5.7 Determination of oil absorption
Perform according to the provisions of GB5211.15. Sample weight is 10g. 5.8 Determination of total calcium content
5.8.1 Principle of the method
The organic extractant extracts iron, and the total calcium content is titrated with potassium permanganate standard titration solution according to the principle of redox reaction. 5.8.2 Reagents and materials
5.8.2.1 Hydrochloric acid (GB622) solution: 1+1 solution. Nitric acid (GB626).
Methyl isobutyl ketone (HG3—1118): chemically pure. 5.8.2.3
5.8.2.4 Ammonia water (GB631): does not contain carbon dioxide. Methyl red indicator: 1g/L ethanol solution, prepared according to GB603. 5.8.2.5
HG/T2250—91
5.8.2.6 Acetic acid (GB676) solution: 99%~100%. 5.8.2.7 Ammonium oxalate (HG3-976) saturated solution. 5.8.2.8 Ammonium oxalate (HG3-976) solution: 1 g/L. 5.8.2.9 Sulfuric acid (GB625) solution: 1 + 4 solution. 5.8.2.10 Potassium permanganate standard titration solution: c(5.8.3 Instruments and equipment
5.8.3.1 Beaker: 250mL.
5.8.3.2 Volumetric flask: 250mL.
5.8.3.3 Pipette: 100mL.
5.8.3.4 Pear-shaped separatory funnel: 250mL. 5.8.3.5 Electric furnace: connected to autotransformer.
5.8.3.6 Balance: sensitivity 0.001g.
5.8.4 Analysis steps
5.8.4.1 Sample
Weigh 10g of sample, accurate to 0.001g.
5.8.4.2 Determination
KMnO.）=0.1mol/L, prepared and calibrated according to GB601. Place the sample in a beaker, add 100mL of hydrochloric acid (5.8.2.1) containing 5mL of nitric acid (5.8.2.2), evaporate to dryness on an electric stove (5.8.3.5), add 100mL of hydrochloric acid (5.8.2.1) and boil, transfer to a 250mL volumetric flask after cooling, dilute to scale with hydrochloric acid (5.8.2.1), take 100mL of the solution, and evaporate to dryness. Add 60mL of hydrochloric acid (5.8.2.1) to dissolve it, and after the solution cools, use 60mL of methyl isobutyl ketone (5.8.2.3) to extract the iron. If the solution is still colored, extract it a second time until the solution is colorless. Add 2 drops of methyl red indicator (5.8.2.5) to the above solution, neutralize with ammonia water (5.8.2.4), acidify the solution with a slightly excessive amount of acetic acid (5.8.2.6), boil the solution, add 50 mL of preheated ammonium oxalate solution (5.8.2.7) and continue boiling until the precipitate becomes granular, let it stand for about 1 hour, filter, and wash with dilute ammonium oxalate solution (5.8.2.8) until the filtrate is free of chloride ions, and finally wash away the ammonium oxalate with a minimum amount of cold water.
Use a glass rod to penetrate the tip of the filter paper, and rinse the precipitate into the flask with hot water, wash the filter paper with about 30 mL of warm sulfuric acid (5.8.2.9), dilute the solution in the flask to 250 mL, and titrate with potassium permanganate standard titration solution (5.8.2.10) at about 75°C until it turns slightly red. The solution temperature should not be lower than 60°C at the titration end point. 5.8.5 Result Expression
Expressed as the mass percentage of calcium oxide (CaO), X, calculated according to formula (2): V2. c2X0.02804
×100=
V2-C2X7.01
Wherein: V2—the amount of potassium permanganate standard titration solution, mL; C2
actual concentration of potassium permanganate standard titration solution, mol/Lm2——mass of the sample, g; Www.bzxZ.net
(2)
0.02804——the mass of calcium oxide equivalent to 1.00mL potassium permanganate standard titration solution [c (KMnO.) = 1.000mol/L], expressed in grams.
The measurement result shall be rounded to two decimal places.
5.9 Determination of color
HG/T2250—91
Perform according to the provisions of GB1864. Take 1.0g of sample, add 0.5mL of refined linseed oil for the first time, grind for 200 turns (50×4), then add 0.5mL and grind for 25 turns.
5.10 Determination of relative tinting strength
Perform according to the provisions of GB5211.19. Preparation of pigment dispersion: take 3.0g of pigment and 1.5g of paint base; preparation of diluted color paste: take 3.0g of white paste and 0.36g of pigment dispersion.
5.11 Determination of the presence of organic coloring matter
5.11.1 Reagents and materials
5.11.1.1 Ethanol (GB678): 95% (V/V). 5.11.1.2 Sodium hydroxide (GB629) solution: 40g/L ethanol solution. 5.11.1.3 Chloroform (GB682).
5.11.2 Instruments and equipment
5.11.2.1 Balance: sensitivity 0.01g.
5.11.2.2 Beaker.
5.11.2.3 Water bath.
5.11.3 Analysis steps
5.11.3.1 Sample
Weigh 2g of sample (two portions) with an accuracy of 0.01g5.11.3.2 Determination
Put one portion of the sample in a small beaker, add 25mL of water, heat to boil, let it clarify, and pour out the supernatant. Add 25mL of ethanol (5.11.1.1) to the residue (pigment), boil it in a water bath, and pour off the supernatant as before. Add 25mL of sodium hydroxide solution (5.11.1.2) to the residue (pigment), boil it in a water bath, let it clarify, pour off the supernatant: observe its color. If the supernatant contains pigment, filter it and observe it again. Put another sample in a small beaker, add 25mL of chloroform (5.11.1.3), boil it in a water bath, let it clarify, pour off the supernatant, observe its color. If the supernatant still contains pigment, filter it and observe it again. 5.11.4 Result Expression
If one of the above solutions is colored, it is considered to have organic coloring matter. If the solutions are all colorless, there is no organic coloring matter. 6 Inspection rules
6.1 Iron oxide black products shall be inspected by the quality inspection department of the manufacturer, and the manufacturer shall ensure that the quality of all products shipped out of the factory meets the technical requirements of this standard. Each batch of iron oxide black shipped out of the factory shall be accompanied by a product quality certificate. 6.2 Among the technical indicators of iron oxide black, iron content, volatile matter at 105℃, water-soluble matter, sieve residue, pH value of water extract, pH value of water suspension, oil absorption, color, and relative tinting strength are nine items as factory inspection items. Each batch of products shall be inspected item by item according to the test methods specified in this standard.
6.3 Among the technical indicators of iron oxide black, total calcium content and the presence of organic coloring matter shall be inspected once every six months according to the test methods specified in this standard.
6.4 Sampling method: in accordance with the relevant provisions of GB9285. 6.5 The quality inspection department shall conduct inspection according to the technical requirements and test methods specified in this standard. If the inspection results do not meet the requirements of this standard, the original batch shall be doubled according to the provisions of Article 6.4, and the items that do not meet the indicators of this standard shall be re-inspected. If the re-inspection results still do not meet the requirements of this standard, the entire batch of products shall be unqualified. 6.6 The user has the right to inspect the products according to the technical requirements and test methods specified in this standard. If the two parties disagree on the inspection results and need to conduct arbitration, the arbitration institution shall be selected by both parties through consultation. 5
7 Marking, packaging, transportation, purchase and storage
7.1 Marking
HG/T2250-91
The packaging should be clearly marked, including the manufacturer's name, product name, trademark, production batch number, standard number, grade and net weight, etc., and be accompanied by a quality certificate.
7.2 Packaging
Iron oxide black pigment is packaged in plastic woven bags lined with plastic film bags or plastic-coated woven bags, with a net weight of 25kg per bag. 7.3 Transportation
During transportation and loading and unloading, it is required to load and unload gently, prevent collision and breakage, and follow the relevant transportation regulations. 7.4 Storage
Iron oxide black pigment is stored in a dry and ventilated place. It is strictly forbidden to contact with acidic and alkaline items. Under the above storage conditions, the effective storage period of unopened pigment is three years.
Additional instructions:
This standard was proposed by the Science and Technology Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Standardization of Paints and Pigments. This standard was drafted by Shanghai Iron Oxide Pigment Factory. The main drafters of this standard are Lai Shenghua and Yang Baogen. From the date of implementation of this standard, the original national standard GB1861-80 "Iron Oxide Black" will be invalid. 63) Extract the iron. If the solution is still colored, extract it a second time until the solution is colorless. Add 2 drops of methyl red indicator (5.8.2.5) to the above solution, neutralize it with ammonia water (5.8.2.4), acidify the solution with a slightly excessive amount of acetic acid (5.8.2.6), boil the solution, add 50 mL of preheated ammonium oxalate solution (5.8.2.7) and continue boiling until the precipitate becomes granular. Let it stand for about 1 hour, filter it, and wash it with dilute ammonium oxalate solution (5.8.2.8) until the filtrate is free of chloride ions. Finally, wash away the ammonium oxalate with a minimum amount of cold water.
Use a glass rod to penetrate the tip of the filter paper and rinse the precipitate into the flask with hot water. Use about 30mL of warm sulfuric acid (5.8.2.9) to wash the filter paper. Dilute the solution in the flask to 250mL and titrate with potassium permanganate standard titration solution (5.8.2.10) at about 75℃ until it turns slightly red. The solution temperature should not be lower than 60℃ at the titration endpoint. 5.8.5 Result Expression
Expressed as the mass percentage of calcium oxide (CaO), X, calculated according to formula (2): V2. c2X0.02804
×100=
V2-C2X7.01
Wherein: V2—the amount of potassium permanganate standard titration solution, mL; C2
actual concentration of potassium permanganate standard titration solution, mol/Lm2——mass of the sample, g;
(2)
0.02804——the mass of calcium oxide equivalent to 1.00mL potassium permanganate standard titration solution [c (KMnO.) = 1.000mol/L], expressed in grams.
The measurement result shall be rounded to two decimal places.
5.9 Determination of color
HG/T2250—91
Perform according to the provisions of GB1864. Take 1.0g of sample, add 0.5mL of refined linseed oil for the first time, grind for 200 turns (50×4), then add 0.5mL and grind for 25 turns.
5.10 Determination of relative tinting strength
Perform according to the provisions of GB5211.19. Preparation of pigment dispersion: take 3.0g of pigment and 1.5g of paint base; preparation of diluted color paste: take 3.0g of white paste and 0.36g of pigment dispersion.
5.11 Determination of the presence of organic coloring matter
5.11.1 Reagents and materials
5.11.1.1 Ethanol (GB678): 95% (V/V). 5.11.1.2 Sodium hydroxide (GB629) solution: 40g/L ethanol solution. 5.11.1.3 Chloroform (GB682).
5.11.2 Instruments and equipment
5.11.2.1 Balance: sensitivity 0.01g.
5.11.2.2 Beaker.
5.11.2.3 Water bath.
5.11.3 Analysis steps
5.11.3.1 Sample
Weigh 2g of sample (two portions) with an accuracy of 0.01g5.11.3.2 Determination
Put one portion of the sample in a small beaker, add 25mL of water, heat to boil, let it clarify, and pour out the supernatant. Add 25mL of ethanol (5.11.1.1) to the residue (pigment), boil it in a water bath, and pour off the supernatant as before. Add 25mL of sodium hydroxide solution (5.11.1.2) to the residue (pigment), boil it in a water bath, let it clarify, pour off the supernatant: observe its color. If the supernatant contains pigment, filter it and observe it again. Put another sample in a small beaker, add 25mL of chloroform (5.11.1.3), boil it in a water bath, let it clarify, pour off the supernatant, observe its color. If the supernatant still contains pigment, filter it and observe it again. 5.11.4 Result Expression
If one of the above solutions is colored, it is considered to have organic coloring matter. If the solutions are all colorless, there is no organic coloring matter. 6 Inspection rules
6.1 Iron oxide black products shall be inspected by the quality inspection department of the manufacturer, and the manufacturer shall ensure that the quality of all products shipped out of the factory meets the technical requirements of this standard. Each batch of iron oxide black shipped out of the factory shall be accompanied by a product quality certificate. 6.2 Among the technical indicators of iron oxide black, iron content, volatile matter at 105℃, water-soluble matter, sieve residue, pH value of water extract, pH value of water suspension, oil absorption, color, and relative tinting strength are nine items as factory inspection items. Each batch of products shall be inspected item by item according to the test methods specified in this standard.
6.3 Among the technical indicators of iron oxide black, total calcium content and the presence of organic coloring matter shall be inspected once every six months according to the test methods specified in this standard.
6.4 Sampling method: in accordance with the relevant provisions of GB9285. 6.5 The quality inspection department shall conduct inspection according to the technical requirements and test methods specified in this standard. If the inspection results do not meet the requirements of this standard, the original batch shall be doubled according to the provisions of Article 6.4, and the items that do not meet the indicators of this standard shall be re-inspected. If the re-inspection results still do not meet the requirements of this standard, the entire batch of products shall be unqualified. 6.6 The user has the right to inspect the products according to the technical requirements and test methods specified in this standard. If the two parties disagree on the inspection results and need to conduct arbitration, the arbitration institution shall be selected by both parties through consultation. 5
7 Marking, packaging, transportation, purchase and storage
7.1 Marking
HG/T2250-91
The packaging should be clearly marked, including the manufacturer's name, product name, trademark, production batch number, standard number, grade and net weight, etc., and be accompanied by a quality certificate.
7.2 Packaging
Iron oxide black pigment is packaged in plastic woven bags lined with plastic film bags or plastic-coated woven bags, with a net weight of 25kg per bag. 7.3 Transportation
During transportation and loading and unloading, it is required to load and unload gently, prevent collision and breakage, and follow the relevant transportation regulations. 7.4 Storage
Iron oxide black pigment is stored in a dry and ventilated place. It is strictly forbidden to contact with acidic and alkaline items. Under the above storage conditions, the effective storage period of unopened pigment is three years.
Additional instructions:
This standard was proposed by the Science and Technology Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Standardization of Paints and Pigments. This standard was drafted by Shanghai Iron Oxide Pigment Factory. The main drafters of this standard are Lai Shenghua and Yang Baogen. From the date of implementation of this standard, the original national standard GB1861-80 "Iron Oxide Black" will be invalid. 63) Extract the iron. If the solution is still colored, extract it a second time until the solution is colorless. Add 2 drops of methyl red indicator (5.8.2.5) to the above solution, neutralize it with ammonia water (5.8.2.4), acidify the solution with a slightly excessive amount of acetic acid (5.8.2.6), boil the solution, add 50 mL of preheated ammonium oxalate solution (5.8.2.7) and continue boiling until the precipitate becomes granular. Let it stand for about 1 hour, filter it, and wash it with dilute ammonium oxalate solution (5.8.2.8) until the filtrate is free of chloride ions. Finally, wash away the ammonium oxalate with a minimum amount of cold water.
Use a glass rod to penetrate the tip of the filter paper and rinse the precipitate into the flask with hot water. Use about 30mL of warm sulfuric acid (5.8.2.9) to wash the filter paper. Dilute the solution in the flask to 250mL and titrate with potassium permanganate standard titration solution (5.8.2.10) at about 75℃ until it turns slightly red. The solution temperature should not be lower than 60℃ at the titration endpoint. 5.8.5 Result Expression
Expressed as the mass percentage of calcium oxide (CaO), X, calculated according to formula (2): V2. c2X0.02804
×100=
V2-C2X7.01
Wherein: V2—the amount of potassium permanganate standard titration solution, mL; C2
actual concentration of potassium permanganate standard titration solution, mol/Lm2——mass of the sample, g;
(2)
0.02804——the mass of calcium oxide equivalent to 1.00mL potassium permanganate standard titration solution [c (KMnO.) = 1.000mol/L], expressed in grams.
The measurement result shall be rounded to two decimal places.
5.9 Determination of color
HG/T2250—91
Perform according to the provisions of GB1864. Take 1.0g of sample, add 0.5mL of refined linseed oil for the first time, grind for 200 turns (50×4), then add 0.5mL and grind for 25 turns.
5.10 Determination of relative tinting strength
Perform according to the provisions of GB5211.19. Preparation of pigment dispersion: take 3.0g of pigment and 1.5g of paint base; preparation of diluted color paste: take 3.0g of white paste and 0.36g of pigment dispersion.
5.11 Determination of the presence of organic coloring matter
5.11.1 Reagents and materials
5.11.1.1 Ethanol (GB678): 95% (V/V). 5.11.1.2 Sodium hydroxide (GB629) solution: 40g/L ethanol solution. 5.11.1.3 Chloroform (GB682).
5.11.2 Instruments and equipment
5.11.2.1 Balance: sensitivity 0.01g.
5.11.2.2 Beaker.
5.11.2.3 Water bath.
5.11.3 Analysis steps
5.11.3.1 Sample
Weigh 2g of sample (two portions) with an accuracy of 0.01g5.11.3.2 Determination
Put one portion of the sample in a small beaker, add 25mL of water, heat to boil, let it clarify, and pour out the supernatant. Add 25mL of ethanol (5.11.1.1) to the residue (pigment), boil it in a water bath, and pour off the supernatant as before. Add 25mL of sodium hydroxide solution (5.11.1.2) to the residue (pigment), boil it in a water bath, let it clarify, pour off the supernatant: observe its color. If the supernatant contains pigment, filter it and observe it again. Put another sample in a small beaker, add 25mL of chloroform (5.11.1.3), boil it in a water bath, let it clarify, pour off the supernatant, observe its color. If the supernatant still contains pigment, filter it and observe it again. 5.11.4 Result Expression
If one of the above solutions is colored, it is considered to have organic coloring matter. If the solutions are all colorless, there is no organic coloring matter. 6 Inspection rules
6.1 Iron oxide black products shall be inspected by the quality inspection department of the manufacturer, and the manufacturer shall ensure that the quality of all products shipped out of the factory meets the technical requirements of this standard. Each batch of iron oxide black shipped out of the factory shall be accompanied by a product quality certificate. 6.2 Among the technical indicators of iron oxide black, iron content, volatile matter at 105℃, water-soluble matter, sieve residue, pH value of water extract, pH value of water suspension, oil absorption, color, and relative tinting strength are nine items as factory inspection items. Each batch of products shall be inspected item by item according to the test methods specified in this standard.
6.3 Among the technical indicators of iron oxide black, total calcium content and the presence of organic coloring matter shall be inspected once every six months according to the test methods specified in this standard.
6.4 Sampling method: in accordance with the relevant provisions of GB9285. 6.5 The quality inspection department shall conduct inspection according to the technical requirements and test methods specified in this standard. If the inspection results do not meet the requirements of this standard, the original batch shall be doubled according to the provisions of Article 6.4, and the items that do not meet the indicators of this standard shall be re-inspected. If the re-inspection results still do not meet the requirements of this standard, the entire batch of products shall be unqualified. 6.6 The user has the right to inspect the products according to the technical requirements and test methods specified in this standard. If the two parties disagree on the inspection results and need to conduct arbitration, the arbitration institution shall be selected by both parties through consultation. 5
7 Marking, packaging, transportation, purchase and storage
7.1 Marking
HG/T2250-91
The packaging should be clearly marked, including the manufacturer's name, product name, trademark, production batch number, standard number, grade and net weight, etc., and be accompanied by a quality certificate.
7.2 Packaging
Iron oxide black pigment is packaged in plastic woven bags lined with plastic film bags or plastic-coated woven bags, with a net weight of 25kg per bag. 7.3 Transportation
During transportation and loading and unloading, it is required to load and unload gently, prevent collision and breakage, and follow the relevant transportation regulations. 7.4 Storage
Iron oxide black pigment is stored in a dry and ventilated place. It is strictly forbidden to contact with acidic and alkaline items. Under the above storage conditions, the effective storage period of unopened pigment is three years.
Additional instructions:
This standard was proposed by the Science and Technology Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Standardization of Paints and Pigments. This standard was drafted by Shanghai Iron Oxide Pigment Factory. The main drafters of this standard are Lai Shenghua and Yang Baogen. From the date of implementation of this standard, the original national standard GB1861-80 "Iron Oxide Black" will be invalid. 611.1.3 Chloroform (GB682).
5.11.2 Instruments and equipment
5.11.2.1 Balance: sensitivity 0.01g.
5.11.2.2 Beaker.
5.11.2.3 Water bath.
5.11.3 Analysis steps
5.11.3.1 Sample
Weigh 2g of sample (two portions) to the nearest 0.01g5.11.3.2 Determination
Put one portion of the sample in a small beaker, add 25mL of water, heat to boil, let it clarify, and pour out the supernatant. Add 25mL of ethanol (5.11.1.1) to the residue (pigment), boil it in a water bath, and pour out the supernatant as before. Add 25mL of sodium hydroxide solution (5.11.1.2) to the residue (pigment), boil it in a water bath, let it clarify, pour out the supernatant, observe its color, if the clear liquid contains pigment, filter it and observe it again. Put another sample in a small beaker, add 25mL of chloroform (5.11.1.3) and boil it in a water bath, let it clarify, pour out the supernatant, observe its color, if the clear liquid still contains pigment, filter it and observe it again. 5.11.4 Result expression
If one of the above solutions is colored, it is considered that there is organic coloring matter. If the solutions are colorless, there is no organic coloring matter. 6 Inspection rules
6.1 The quality inspection department of the manufacturer shall be responsible for the inspection of black iron oxide products. The manufacturer shall ensure that the quality of all products shipped out of the factory meets the technical requirements of this standard. Each batch of black iron oxide shipped out of the factory shall be accompanied by a product quality certificate. 6.2 Among the technical indicators of black iron oxide, nine items, including iron content, volatile matter at 105℃, water-soluble matter, sieve residue, pH value of water extract, pH value of water suspension, oil absorption, color, and relative tinting strength, are used as factory inspection items. Each batch of products shall be inspected item by item according to the test methods specified in this standard before leaving the factory.
6.3 Among the technical indicators of black iron oxide, two items, including total calcium content and the presence of organic coloring matter, shall be inspected once every six months according to the test methods specified in this standard.
6.4 Sampling method: in accordance with the relevant provisions of GB9285. 6.5 The quality inspection department shall inspect according to the technical requirements and test methods specified in this standard. If the inspection results do not meet the requirements of this standard, double sampling shall be carried out from the original batch number according to the provisions of Article 6.4, and the items that do not meet the requirements of this standard shall be re-inspected. If the re-inspection results still do not meet the requirements of this standard, the entire batch of products shall be unqualified. 6.6 The user unit has the right to inspect the products according to the technical requirements and test methods specified in this standard. If the two parties disagree on the inspection results and need to conduct arbitration, the arbitration institution shall be selected by the two parties through consultation. 5
7 Marking, packaging, transportation, purchase and storage
7.1 Marking
HG/T2250-91
The packaging should be clearly marked, including the manufacturer's name, product name, trademark, production batch number, standard number, grade and net weight, and attached with a quality certificate.
7.2 Packaging
Iron oxide black pigment is packaged in plastic woven bags lined with plastic film bags or plastic-coated woven bags, with a net weight of 25kg per bag. 7.3 Transportation
During transportation and loading and unloading, it is required to load and unload lightly, and collision and rupture should be prevented. It should be carried out in accordance with relevant transportation regulations. 7.4 Storage
Iron oxide black pigment is stored in a dry and ventilated place, and it is strictly forbidden to contact with acidic and alkaline items. According to the above storage conditions, the effective storage period of unopened pigment is three years.
Additional Notes:
This standard was proposed by the Science and Technology Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Standardization of Paints and Pigments. This standard was drafted by Shanghai Iron Oxide Pigment Factory. The main drafters of this standard are Lai Shenghua and Yang Baogen. From the date of implementation of this standard, the original national standard GB1861-80 "Iron Oxide Black" will be invalid.11.1.3 Chloroform (GB682).
5.11.2 Instruments and equipment
5.11.2.1 Balance: sensitivity 0.01g.
5.11.2.2 Beaker.
5.11.2.3 Water bath.
5.11.3 Analysis steps
5.11.3.1 Sample
Weigh 2g of sample (two portions) to the nearest 0.01g5.11.3.2 Determination
Put one portion of the sample in a small beaker, add 25mL of water, heat to boil, let it clarify, and pour out the supernatant. Add 25mL of ethanol (5.11.1.1) to the residue (pigment), boil it in a water bath, and pour out the supernatant as before. Add 25mL of sodium hydroxide solution (5.11.1.2) to the residue (pigment), boil it in a water bath, let it clarify, pour out the supernatant, observe its color, if the clear liquid contains pigment, filter it and observe it again. Put another sample in a small beaker, add 25mL of chloroform (5.11.1.3) and boil it in a water bath, let it clarify, pour out the supernatant, observe its color, if the clear liquid still contains pigment, filter it and observe it again. 5.11.4 Result expression
If one of the above solutions is colored, it is considered that there is organic coloring matter. If the solutions are colorless, there is no organic coloring matter. 6 Inspection rules
6.1 The quality inspection department of the manufacturer shall be responsible for the inspection of black iron oxide products. The manufacturer shall ensure that the quality of all products shipped out of the factory meets the technical requirements of this standard. Each batch of black iron oxide shipped out of the factory shall be accompanied by a product quality certificate. 6.2 Among the technical indicators of black iron oxide, nine items, including iron content, volatile matter at 105℃, water-soluble matter, sieve residue, pH value of water extract, pH value of water suspension, oil absorption, color, and relative tinting strength, are used as factory inspection items. Each batch of products shall be inspected item by item according to the test methods specified in this standard before leaving the factory.
6.3 Among the technical indicators of black iron oxide, two items, including total calcium content and the presence of organic coloring matter, shall be inspected once every six months according to the test methods specified in this standard.
6.4 Sampling method: in accordance with the relevant provisions of GB9285. 6.5 The quality inspection department shall inspect according to the technical requirements and test methods specified in this standard. If the inspection results do not meet the requirements of this standard, double sampling shall be carried out from the original batch number according to the provisions of Article 6.4, and the items that do not meet the requirements of this standard shall be re-inspected. If the re-inspection results still do not meet the requirements of this standard, the entire batch of products shall be unqualified. 6.6 The user unit has the right to inspect the products according to the technical requirements and test methods specified in this standard. If the two parties disagree on the inspection results and need to conduct arbitration, the arbitration institution shall be selected by the two parties through consultation. 5
7 Marking, packaging, transportation, purchase and storage
7.1 Marking
HG/T2250-91
The packaging should be clearly marked, including the manufacturer's name, product name, trademark, production batch number, standard number, grade and net weight, and attached with a quality certificate.
7.2 Packaging
Iron oxide black pigment is packaged in plastic woven bags lined with plastic film bags or plastic-coated woven bags, with a net weight of 25kg per bag. 7.3 Transportation
During transportation and loading and unloading, it is required to load and unload lightly, and collision and rupture should be prevented. It should be carried out in accordance with relevant transportation regulations. 7.4 Storage
Iron oxide black pigment is stored in a dry and ventilated place, and it is strictly forbidden to contact with acidic and alkaline items. According to the above storage conditions, the effective storage period of unopened pigment is three years.
Additional Notes:
This standard was proposed by the Science and Technology Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Standardization of Paints and Pigments. This standard was drafted by Shanghai Iron Oxide Pigment Factory. The main drafters of this standard are Lai Shenghua and Yang Baogen. From the date of implementation of this standard, the original national standard GB1861-80 "Iron Oxide Black" will be invalid.
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