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Chemical Industry Standard of the People's Republic of China
HG/T2660-95
Polyurethane enamel of various colors (two-component)
Published on March 6, 1995
Ministry of Chemical Industry of the People's Republic of China
Implemented on June 1, 1996
W Chemical Industry Standard of the People's Republic of China
Polyurethane enamel of various colors (two-component)
1 Subject content and scope of application
HG/T2660-95
This standard specifies the technical requirements, test methods, inspection rules, marking, packaging, storage and transportation of polyurethane enamel of various colors (two-component).
This standard is applicable to the packaged coating composed of prepolymer containing toluene diisocyanate as a component; pigments, fillers and additives and hydroxyl-containing alkyd resin as two components.
The products of this standard are applicable to the surface decoration and protection of wooden furniture and interior metal products. 2 Reference standards
Determination of hiding power of coatings
GB/T1726
GB/T1727
GB/T1728
GB/T1730
GB/T1764
GB/T1768
GB/T3186
GB/T5208
GB/T6682
GB/T6740
GB/T6742
GB/T675 1
General preparation of paint film
Determination of drying time of paint film and putty film
Determination of paint film hardness Pendulum damping test
Determination of paint film thickness
Determination of paint film abrasion resistance
Sampling of paint products
Determination of paint flash point Rapid equilibrium method
Specifications and test methods for water used in analytical laboratories Determination of volatile and non-volatile matters in paints
Bending test of paint film (cylindrical axis)
Determination of volatile and non-volatile matters in paints and varnishes GB/T 6753.1
Determination of grinding fineness of paint
4 Determination of resistance of paint and varnish to liquid media
GB/T9274
GB9278
Coating sample state conditioning and test temperature and humidity GB/T9286
GB/T9750
GB/T9754
GB/T9761
Scratch test of paint and varnish film Test
Paint product packaging marking
Paints and varnishes Determination of specular gloss at 20°, 60° and 85° of paint films without metallic pigments Paints and varnishes Visual colorimetry of paints
GB/T13491
HG/T2458
3 Technical requirements
General rules for packaging of coating products
General rules for inspection, transportation and storage of coating products Products should comply with the technical requirements in Table 1.
Approved by the Ministry of Chemical Industry of the People's Republic of China on March 6, 1995 and implemented on June 1, 1996
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Coating color and appearance
State of original paint in container
Component-
Component 2
Non-volatile matter content, %
Fineness, μm
Hiding power/m2
Red, yellow
Drying time, h
Gloss, 60℃
Light color (105±2℃)
Dark color (120±2℃)
Cross-cut test, grade
Bending, mm
Water resistance
Acid resistance (immersed in 5%V/V sulfuric acid solution)Alcohol resistance (immersed in Abrasion resistance in 50% V/V ethanol solution (750g/500r), g
Flash point, ℃
Free TDI monomer, %
Not less than
Not greater than
Not greater than
Not less than
Not greater than
Not less than
Not greater than
Not less than
Not greater than
HG/T2660—95
First-class product
Qualified product
Conforms to the standard plate and its color difference range, the paint film is flat and smooth, light yellow and brown transparent liquid, no mechanical impurities, easy to stir and evenly, no obvious lumps
No bubbling, no thread, no shedding for 96 hours, the paint film is allowed to turn white, and it recovers in 2 hours.
No blistering, bridging, or shedding for 14 hours
No blistering, bridging, or shedding for 72 hours. The paint film is allowed to turn white and recover for 2 hours.
No blistering, bridging, or shedding for 12 hours
No blistering, bridging, or shedding for 5 hours. No abnormal changes in the paint film
No blistering, bridging, or shedding for 4 hours.
W4 Test Method
4.1 General Test Conditions
HG/T2660—95
4.1.1 The ratio between the two components is adjusted according to the ratio between the components specified in the product introduction and instructions of each manufacturer. The plate making method is carried out in accordance with the provisions of GB/T1727.
4.1.2 The state adjustment of the test room is carried out in accordance with the provisions of GB9278. 4.1.3 The film thickness shall be measured in accordance with GB/T1764. The film thickness shall be between (30 ± 4) um. Unless otherwise specified, the test plates shall be tinplate plates.
4.1.4 The physical indexes of the paint film after plate making shall be tested after drying for 48 hours under constant temperature and humidity conditions. The rest of the indexes shall be tested after drying for 1 hour under the standard temperature conditions and then placed under constant temperature and humidity conditions for 1 hour. 4.2 The color and appearance of the paint film shall be measured in accordance with GB/T9761.
4.3 The state of the original paint in the container shall be measured in accordance with 4.3 of GB/T3186.
4.4 The non-volatile content shall be measured in accordance with GB/T6740. The mixed components shall be measured. 4.5 Fineness
According to GB/T6753.1.
4.6 Hiding power
According to GB/T1726.
4.7 Drying time
According to GB/T1728, surface drying according to method B, actual drying according to method A4.8 Gloss
According to GB/T9754.
4.9 Cross-cut test
According to GB/T9286, 6×6 cutting, cutting spacing 1mm. 4.10 Bending
According to GB/T6742.
4.11 Hardness
According to method B in GB/T1730.
4.12 Water resistance
Immerse in water in accordance with GB/T6682 and carry out according to the provisions of 5 in GB/T9274. 4.13 Acid resistance
The test plate is a 50×120×0.45～0.55mm steel plate, which is edge-sealed after preparation and is tested in accordance with the provisions of 5 in GB/T9274. 4.14 Alcohol resistance
The test plate is a 90×120×2～3mm glass plate, which is edge-sealed after preparation and is tested in accordance with the provisions of 5 in GB/T9274. 4.15 Abrasion resistance
It is tested in accordance with the provisions of GB/T1768.
4.16 Flash point
It is tested in accordance with the provisions of GB/T5208.
4.17 Free monomer (TDI)
It is tested in accordance with the provisions of Appendix B.
W.bzsoso：com5 Inspection rules
5.1 It is tested in accordance with the provisions of Chapter 3 of HG/T2458. HG/T2660—95
5.2 The items listed in this standard are type inspection items. Except for the paint film color and appearance, non-volatile content, fineness, hiding power, drying time, gloss, cross-cut test, bending, hardness, and the state of the original paint container, which are factory inspection items, the remaining items are sampled once a year. 6 Marking
Perform according to GB/T9750.
7 Packaging
Perform according to GB/T13491.
8 Transportation and storage
Perform according to Chapter 4 of HG/T2458.
9 Safety, hygiene, and environmental protection regulations
This paint contains organic solvents such as ketones, lipids, and xylene, which are flammable liquids and have certain toxicity. Therefore, the construction site should comply with the coating operation and safety operating procedures, and take measures such as fire prevention, dust prevention, anti-static, and anti-poisoning. 4
WHG/T2660—95
Appendix A
Construction reference
(reference)
A1 Can be applied by brush or spray. One coat should have good construction and leveling properties. To adjust the viscosity, use X-10 polyurethane thinner. Avoid using alcohol, ammonia solvents and nitro lacquer thinners. A2 Before use, mix the two components according to the ratio specified on the manufacturer's packaging or instruction manual. Do not mix too much at one time. It is best to use up the prepared paint within 4 hours (23±2℃). The interval between the next spray or brush coating is 2 hours in summer and 4 hours in winter. A3 The paint dries at room temperature and can also be dried. A4 Component 1 must be properly stored and the container must be tightly sealed to prevent water seepage and air leakage from causing the paint to gel and deteriorate. Appendix B
Determination of free toluene diisocyanate in polyurethane coatings by gas chromatography (supplement)
B1 Scope of application
This appendix applies to the determination of free toluene diisocyanate (TDI) in polyurethane coatings. B2 Principle of the method
The sample is gasified and passed through a chromatographic column to separate the free toluene diisocyanate to be measured from other components, and then detected by a hydrogen flame ionization detector and quantified by the internal standard method.
B3 Materials
B3.1 Carrier gas: nitrogen, purity 99.8%
B3.2 Fuel gas: hydrogen, purity 99.8%
B3.3 Fuel-supporting gas: air.
B4 Reagents
B4.1 Ethyl acetate: analytical grade, dehydrated with 5A molecular sieve; B4.2 Tetradecane: chromatographic grade;
B4.3 Toluene diisocyanate: analytical grade (mixture of 80% 2,4-toluene diisocyanate and 20% 2,6-toluene diisocyanate). B5 Instruments
B5.1 Gas chromatograph: any type of chromatograph that can meet the requirements of analytical conditions, equipped with a hydrogen flame ionization detector, and the detection limit of benzene D≤1X10-g/s. The inner lining of the vaporizer can be replaced with a glass tube or a section of empty column in front of the column, and it should be cleaned regularly. B5.2 Chromatographic column: 2mm inner diameter, 1m long stainless steel column. Column packing:
Fixed liquid: 7% dimethyl silicone oil SE-30. a.
b.Carrier: 102 silanized white carrier, particle size 0.150~0.180mm (80~100 mesh). B5.3 Injector: micro syringe, 1uL. 5
WB6 Chromatographic operating conditions
Internal standard: tetradecane;
Column temperature: 150℃;
Detector temperature: 200℃;
Vaporization chamber temperature: 150℃;
Carrier gas flow rate: nitrogen, 30mL/min
Injection volume: 0.2uL.
B7 Preparation
B7.1 Preparation of stationary phase
HG/T2660—95
According to the liquid-carrier ratio, accurately weigh a certain amount of stationary liquid dimethyl silicone oil, measure 1.2 times the volume of the carrier solvent chloroform, add it to a ground-mouth round-bottom flask, connect a ground-mouth condenser, heat and reflux for half an hour, after the stationary liquid is completely dissolved, pour the carrier, continue to reflux for 1.5 to 2 hours, then cut off the power and remove the condenser, heat to about 50°C in a fume hood with an infrared lamp, slowly evaporate the solvent until dry, heat to 60°C, dry for half an hour, sieve and set aside. B7.2 Filling and aging of chromatographic column
Plug one end of the washed and dried column with a copper wire mesh. Connect the column to the vacuum pump to evacuate the air, connect the other end to the funnel, slowly add the prepared stationary phase, and gently tap the column until the stationary phase no longer enters, plug the two ends with glass wool. Then connect the column to the chromatograph (without the detector) and pass nitrogen for segmented aging, age at 80℃, 120℃, and 160℃ for 2h respectively, and then raise the temperature to 185℃ for aging until the baseline is straight. B7.3 Determination of correction factor
B7.3.1 Preparation of internal standard solution: weigh 1.0g (accurate to 0.0002g) of tetradecane, put it into a dry volumetric flask, and dilute it to 100mL with anhydrous ethyl acetate.
B7.3.2 Preparation of toluene diisocyanate solution: weigh 1.0g (accurate to 0.0002g) of toluene diisocyanate monomer, put it into a dry volumetric flask, and dilute it to 100mL with anhydrous ethyl acetate. The shelf life of this solution is 2 days. B7.3.3 Prepare standard samples: Use a pipette to accurately draw 5 mL of internal standard solution and 5 mL of toluene diisocyanate solution, inject into the sample bottle, mix, and shake well.
B7.3.4 According to the chromatographic operating conditions, after the instrument is stabilized, inject the standard sample into the chromatograph and record the chromatogram. B7.3.5 Calculate the relative correction factor of toluene diisocyanate according to formula (B1): mTDr·Ac14
mC14·ATDE
Where: f——relative correction factor of toluene diisocyanate mTDI
——mass of toluene diisocyanate in the standard sample, nom;——mass of tetradecane in the standard sample, g;——peak area of toluene diisocyanate;
Ac4——peak area of tetradecane.
The relative correction factor measured by the above test steps can only be used if the difference between the two measurement results is less than 10%. B7.4 Determination of relative retention time
B7.4.1 According to the chromatographic operating conditions, after the instrument is stable, inject the standard sample into the chromatograph and record the retention time of each component. Take tetradecane as the benchmark, calculate the relative retention time of each component, and use this relative retention time for qualitative analysis. B7.4.2 The retention time of each component is in the following order: ethyl acetate;
toluene diisocyanate;bzxz.net
tetradecane.
Ww.bzsoso：comHG/T2660—95
Attached is a typical chromatogram of free toluene diisocyanate monomer in polyurethane coating. 21
Figure B1 Typical chromatogram of free toluene diisocyanate monomer in polyurethane coating 1-ethyl acetate 2-solvent in coating
B8 Determination steps
B8.1 Determination of sample weight: The sample weight is determined according to the content of free toluene diisocyanate, see Table (B1): 7
W. Percentage of free toluene diisocyanate
HG/T2660-95
Weighing weight g
B8.2 Inject the sample into the sample bottle according to the above table, weigh the mass of the sample by incremental method (accurate to 0.0002g), then add 5mL of internal standard solution with a pipette, add 5mL of anhydrous ethyl acetate with a 10mL measuring cylinder, and mix and shake well. B8.3 According to the chromatographic operating conditions, after the instrument is stable, inject 0.2mL of the sample prepared according to the above requirements into the chromatograph and record the chromatogram. B8.4 Qualitatively analyze each component according to the relative retention time. B8.5 Measure the peak areas of free toluene diisocyanate and tetradecane (internal standard). When measuring manually, measure the peak height and half peak width. The peak area is obtained by multiplying the peak height by the half peak width. If a data processor is used, the analysis and calculation program can be pre-programmed for automatic calculation. B9 Calculate
Calculate the percentage of free toluene diisocyanate according to formula (B2). Calculate to 0.01%. X
mc4.Arpr·f
m·Acl
-Free toluene diisocyanate in the sample is the mass percentage, % Where: XTRI-
The mass of the sample, g,
mc14-The mass of the added internal standard tetradecane, gArDr-The peak area of free toluene diisocyanate, cm?; Ac14-The peak area of the internal standard tetradecane, cmYu-Relative correction factor of toluene diisocyanate B10 Precision
The following values are used to judge the reliability of the results. B10.1 Repeatability: The absolute value of the difference between the results of two repeated measurements by the same operator should not be greater than 0.10%. B10.2 Reproducibility: The absolute value of the difference between the results of the same sample measured by two laboratories should not be greater than 0.20%. B11 Report
Take the arithmetic mean of the results of two parallel determinations as the determination result of free toluene diisocyanate in the sample, and the reported result should be expressed to two decimal places.
Additional Notes:
This standard is proposed by the Technical Supervision 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 Wuhan Shuanghu Paint Industry Company and Changzhou Paint Chemical Research Institute of the Ministry of Chemical Industry. The main drafters of this standard are Liu Xingping, Liu Jiyuan and Sun Shaohua. This standard is not equivalent to the Canadian Government Specification Bureau 1-GP-180M general-purpose two-package polyurethane coating standard. 8
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