Some standard content:
Chemical Industry Standard of the People's Republic of China
Rubber Adhesive RS
1 Subject Content and Scope of Application
HG/T 2188-91
This standard specifies the technical requirements, test methods, inspection rules and product marking, packaging, transportation and storage requirements of adhesive RS.
This standard applies to resorcinol donor adhesive prepared by eutectic melting of isophthalic acid and stearic acid, which is combined with methyl donor adhesive and is used for bonding rubber to skeleton materials. Here, skeleton materials include brass-plated or galvanized steel cords, steel wire ropes and metal plates, as well as nylon, polyester, vinylon, viscose fiber, glass fiber or palm fiber and other wiring or fabrics. 2 Reference Standards
GB601, Chemical Reagents. Preparation of standard solution for titration analysis (volumetric analysis) GB603 Preparation of preparations and products used in chemical reagent test methods GB4472 General rules for determination of density and relative density of chemical products 3 Technical requirements
3.1 Physical and chemical properties
Binder RS is soluble in alcohol, ether, chloroform, carbon tetrachloride, partially soluble in water, and insoluble in n-heptane. 3.2 Control items and indicators
Binder RS should meet the following control items and indicator requirements, Item
Methanodiol content, %
Ash content. %
Dense, area/cm
4 Test method
4.1 Appearance
Gray or light-colored flakes
58. 0~62. 0
1. 102 ~ 1. 160
Visually inspect the intact packaging. The sample with a short storage time within the validity period is gray flakes; the sample with a long storage time within the validity period is light brown flakes. This change phenomenon is caused by the oxidation of the product surface by air and will not affect the adhesive properties. 4.2 Determination of resorcinol content
4.2.1 Principle
Use sodium nitrite standard solution to titrate the test solution containing resorcinol to generate colored azo compounds: the titration end point is when starch potassium iodide test paper shows blue. The content of mesoprolol can be calculated according to the consumed volume of sodium nitrite standard solution. Approved by the Ministry of Chemical Industry of the People's Republic of China on December 23, 1991, 6
1992-05-01 implementation
HG/T-2188-91
The chemical reaction formula for the determination of mesoprolol by nitrite method is as follows: HO,s
4.2.2 Reagents and solutions
4.2.2.1 Hydrochloric acid solution: 3+7:
NH,+NaNO,+2HCl- HO,S
4.2.2.2 Standard sodium nitrite titration solution: c(NaNO,)=0.5mo1/L: According to, GB 601 Preparation and calibration,
4.2.2.3 Starch potassium iodide test paper: Prepare according to GB603.4.2.3 Instruments
4.2.3.1 Analytical balance: Sensitivity 0.0001g.4.2.3.2 Acid burette: 50mL
4.2.3.3 Ice bath.
4.2.4 Preparation of test solution
N,C1+NaCI+2H,
Weigh 0.5g of sample, calibrate to 0.0002g, place in a beaker with a capacity of 600mL, add 300mL of pannic acid solution (4.2.2.1), and use it as test solution after dissolving.
4.2.5. Analysis steps
The temperature of the test solution is lowered to below 10°C in an ice bath while stirring; then the sodium nitrite standard titration solution (4.2.2.2) is used for titration. During titration, the lower end of the burette is inserted into the test solution about 10 mm, and a sodium nitrite standard titration solution equivalent to 90% of the theoretical amount is added at once within 2 ml. The burette is raised so that the lower end is away from the surface of the test solution, and the titration is continued slowly. When the end point is approaching, a drop of the test solution is dipped into the iodine test paper with a glass rod. After a slight blue spot appears, the end point is reached when the slight blue spot still appears after 5 minutes by the same method. 4.2.6 Expression of analysis results
4.2.6.1 Isophthalic acid content (%) is calculated according to formula (1): V.ex0.05505
y- cx 5.505
Wherein: "V-consumed volume of sodium nitrite standard titration solution, mL:-actual concentration of sodium nitrite standard titration solution. 1/L; mass of sample, g;
0.05505m-the mass of meta-diphenol in grams equivalent to the concentration of 1.00mL sodium nitrite standard titration solution c(NaNO,)=1mol/L),
4.2.6.2 Take the average value of the parallel test results as the meta-diphenol content of the sample, 4.2. 7 Allowable difference
The difference between the two test results of parallel determination should not be greater than 1%. 4. 3 Determination of ash content
4. 3. 1 Principle
HG /T 2188-91
The mass of the sample completely carbonized and burned to constant weight is taken as the ash content, 4. 3.2 Apparatus
4.3.2.1 Silica or platinum: 50 mL,
4.3.2.2 Analytical balance: sensitivity 0.0001 g.4.3.2.3 Sealed electric furnace;
4.3.2. 4 Muffle furnace;
4.3.2.5 Hand-held desiccator
4.3.3 Analysis steps
After burning the clean and dry sample in a muffle furnace at 650℃ for 30min, put it in a desiccator and cool it to room temperature. Weigh its mass and accurate to 0.0002 %. Weigh 5g of sample in a crucible and accurate to 0.0002g. Heat the sample slowly in a closed electric furnace (avoid fire) until it is completely carbonized. Then move the crucible into the muffle furnace, burn it at 650±25℃ for 25min, take it out, put it in a desiccator and cool it to room temperature (about 30min), weigh its mass, and then put it in the furnace to burn for 30min, cool and weigh it. Repeat the operation until constant weight is reached.
4.3.4 Expression of analysis results
4.3.4.1 Test The ash content of the sample is calculated by formula (2): m-m
wherein: m is the mass of the ash after ignition, gm2 is the mass of the ash after ignition, gi
is the mass of the sample, g.
4.3.4.2 The average value of the two test results is taken as the ash content of the sample. 4.3.4.3 Allowable difference
The difference between the two test results of parallel setting should not be greater than 0.0005g4.4 Determination of density by balance method
4.4.1 Principle
Use a balance to weigh the mass of the solid sample in the air and in the measuring medium respectively. When the sample is immersed in the measuring medium, its mass is less than that in the air, and its reduction value is the mass of the sample displaced by the same volume of the measuring medium, and the volume of the sample is equal to the volume of the displaced measuring medium.
4.4.2 Reagents
n-heptane: experimental reagent, 0.681～0.687.4.4.3 Apparatus
4.4.3.1 Analysis balance: 0.0001g, 4.4.3.2 Two beakers, with volumes of 50mL and 100mL respectively 4.4.3.3 Balance pan cross stand: the size should be suitable for being placed in the gap between the balance pan and the hanging basket (or hair), that is, it should meet the requirements of Figure 3 of GB4472
4. 4. 4. 4 Sample
Weigh about 20g of sample in a 50mL beaker, place the beaker on an electric furnace and heat it slowly until the sample is completely melted. When the sample cools and becomes semi-fluid, stir it evenly and sinter it into an irregular circle with a diameter of about 1.5～2.0cm. When the sample is not completely solidified, drill a small hole in the center to discharge the unnecessary bubbles in the sample. After the sample is completely cooled and formed, put it in a dryer as the sample to be tested.
4. 4.5 Analysis steps
HG/T 2188-91
Follow the analysis steps in Article 2.2.3.3 of GB4472, and the test humidity is 21±0.5C. 4. 4.6 Expression of analysis results
Calculate according to the method specified in Article 2.2.3.4 of GB4472. The average value of the results of two parallel tests is the density of the tested sample.
4.4. Allowable difference
The allowable difference of two test results in parallel is 0.005.5 Inspection rules
5.1 The quality inspection department of the manufacturer is responsible for the inspection of the adhesive RS to ensure that each batch of products shipped from the factory meets the technical requirements of this standard. 5.2 The user has the right to review the quality of the purchased products according to the technical requirements and test methods specified in this standard. 5.3 Batch and Bundle Sample
5.3.1 Batch
The manufacturer generally regards one signed product as a batch. The user regards the total amount of one purchase as a batch. 5.3.2 Sampling
20% of the total number of packages of each batch of products shall be sampled, and the number of sampled packages shall not be less than 3. When the number of packages of each batch of products is less than 3, samples shall be taken piece by piece, and the amount of each sample shall not be less than 100g. 5.3.3 Sampling method
5.3.3.1 Use a stainless steel sampling tube to take samples of approximately the same number from the upper, middle and lower parts of the product packaging. 5.3,3.2 Mix the samples carefully. If the sample size is too large, it can be reduced to reduce its amount. The specific method is: pour the sample onto clean paper and spread it into a circle of uniform thickness. Draw two intersecting vertical lines through the center of the circle to divide the sample into four equal parts. Take two of the four parts and mix them evenly as test samples. The remaining sample after reduction shall not be less than 100 birds. Put them into two clean and dry ground-mouth bottles respectively, affix labels, indicate the sample name, batch number, production date, and sampling date, send one bottle to the quality inspection department for quality inspection, and seal the other bottle for re-inspection or arbitration. The sample retention period is half a year. 5.4 Judgment rules
5.4.1 If any indicator of product quality inspection does not meet the requirements of this standard, When the requirements of the standard are met, samples of twice the number of trays should be taken from twice the packaging according to the specified sampling method for re-inspection. If the re-inspection results still do not meet the requirements of this standard, the entire batch of products shall be deemed unqualified.
5.4.2. When the supply and demand parties have objections to the product quality, the quality supervision agency specified by the state may conduct arbitration. 6 Marking, packaging, transportation and storage
6.1 Marking
The surface of the adhesive RS packaging is printed with obvious and firm markings, indicating the manufacturer's name, product name, trademark, production date, production batch number, main product parameters and effective use period, etc. 6.2 Packaging
The adhesive RS is enclosed in a kraft paper bag lined with plastic and covered with a burlap bag with the openings sewn together. The net weight of each bag is 20kg.6.3 Transportation
This product must not be exposed to sunlight or moisture during long-distance transportation, and must not be hooked during loading and unloading.6.4 Storage
This product should be stored in a dry, clean, light-proof warehouse and must not be piled in the open air or exposed to moisture. From the date of production, the effective storage period of this product is 1 year.bzxz.net
Additional instructions:
HG/T 2188-91
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 Shanghai Rubber Products Research Institute. This standard was funded by Beijing Rubber Industry Research and Design Institute of the Ministry of Chemical Industry and Changzhou Shuguang Chemical Plant. The main developers of this standard are Pu Qijun, Chen Naijue and Ding Juan.
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