Some standard content:
Chemical Industry Standard of the People's Republic of China
HG/T2405-92
Vinyl acetate-ethylene copolymer emulsion adhesive 1992-10-22 issued
Ministry of Chemical Industry of the People's Republic of China
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Chemical Industry Standard of the People's Republic of China
Vinyl acetate-ethylene copolymer emulsion adhesive subject content and scope of application
HG/T 240592
This standard specifies the technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of vinyl acetate-ethylene copolymer emulsion adhesives.
This standard applies to vinyl acetate-ethylene copolymer emulsion adhesives. 2 Reference standards
GB2944 Provisions for packaging, marking, transportation and storage of adhesive products GB11175 Test methods for polyvinyl acetate emulsion GB11178
Polyvinyl acetate emulsion wood adhesive
3 Product varieties
Vinyl acetate-ethylene copolymer emulsion adhesives are divided into three types: Type I, Type II and Type II. Technical requirements
Product performance should comply with the provisions of Table 1:
Evaporation residue, %
Viscosity, Pa·s (25℃)
Minimum film-forming temperature, ℃
Residual vinyl acetate, %
Particle size, um
Dilution stability, %
Ethylene content, %
First-class product
First-class product
Milky white or slightly yellow, without coarse particles, foreign matter or sediment 4 .0~6.5
Approved by the Ministry of Chemical Industry of the People's Republic of China on October 22, 19922.3~3.3
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First-class product
Implementation on July 1, 1993
5 Test method
HG/T2405-92
5.1 Appearance, pH value, evaporation residue: viscosity, minimum film forming temperature, residual vinyl acetate, particle size shall be carried out in accordance with GB11175.
5.2 Ethylene content shall be carried out in accordance with Appendix A
5.3: Dilution stability shall be carried out in accordance with Appendix B.
6 Inspection rules
6.1 Sampling method shall be carried out in accordance with the provisions of Chapter 3 of GB11175. 6.2 Products must be inspected by the quality inspection department of the manufacturer. If the inspection is qualified, the quality inspection department will issue a certificate. 6.3 Factory inspection
Appearance, pH, evaporation residue, viscosity, residual vinyl acetate, dilution stability, ethylene content and other items must be inspected once per batch, with a maximum batch size of 100m3
6.4 Type inspection
6.4.1 All technical requirements specified in this standard should be inspected. 6.4.2 At least once a month.
6.5 Judgment rules
If any of the test results do not meet the technical requirements of this standard, double sampling should be carried out according to the sampling method specified in Chapter 3 of GB11175, and the unqualified items should be re-tested. If the re-test meets the standard requirements, the batch of products is first-class, otherwise the batch of products is unqualified.
6.5 If the supply and demand parties have disputes over the test results, the adhesive management unit of the Ministry of Chemical Industry or the quality inspection department designated by the superior shall conduct arbitration 7 Marking, packaging, transportation, purchase and storage
7.1 Packaging
When vinyl acetate-ethylene copolymer emulsion adhesive is packed in a packaging barrel lined with double-layer plastic bags, the net weight of the paper barrel packaging is 30kg, and the net weight of the open steel barrel packaging is 200kg. When using closed steel barrels lined with plastic, the net weight is 200kg. When using closed and open rigid all-plastic barrels, the net weight is 130kg, and it can also be packed in stainless steel bulk tank trucks. 7.2 Marking
The packaging container should have clear and firm markings, including: product name, brand, grade, standard number, trademark, net weight, production batch number and production date, name, address, telephone number of the production unit, etc. 7.3 Transportation
It should be handled with care during transportation to prevent impact. 7.4 Storage
Vinyl acetate-ethylene copolymer emulsion adhesive must be stored indoors at an ambient temperature of 5-37℃; the storage period is half a year from the date of production. The performance of products that exceed the storage period should be inspected for all items in accordance with the provisions of this standard, and they can be used if they pass the inspection. 2
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HG/T2405-92
Appendix A
Determination method of ethylene content
(supplement)
Grating infrared spectrophotometer or Fourier transform infrared spectrophotometer can scan in the wavenumber range of 3200cm-1 to 500cm-1. b. Thallium iodide-thallium bromide (KRS-5) wafer or silver bromide wafer. c. Infrared drying lamp.
A2 Determination steps
A2.1 Use nuclear magnetic resonance spectrometer to calibrate the ethylene content of a series of standard samples. The calibration conditions are frequency 100MHz, temperature 150℃, hydrogen spectrum, and solvent is dimethyl sulfoxide. A2.2 Use a glass rod to evenly apply a thin layer of the above standard samples with known ethylene content on KRS-5 or silver bromide wafer. Dry under infrared drying lamp until transparent (about 15 minutes), and perform infrared spectrum scanning on the dried polymer film to check whether the transmittance of the two absorption peaks of 2860c and 606cm~l is between 30% and 70%. If the transmittance exceeds this range, the film must be re-coated to adjust the film thickness to the appropriate range. Then convert the scanning recording mode to the absorbance method and scan in the wavenumber range of 4000cm-1 to 400cm-1
A2.3 Draw a baseline from the closest 3100cm-l to 2775cm~l, and measure the absorption peak from the peak at 2860cm-1 to the baseline in units of absorbance,
A2:4 Draw a baseline from the closest 704cm21 to 573cm-1, and measure the absorption peak from the peak at 606cm-1 to the baseline in units of absorbance,
A2.5 Calculate 2860c A2.6 Calculate the peak ratio RM-1 at 2860cm-1 and 606cm-1 by the same steps as A2.2 to A2.5 for the sample with unknown ethylene content. A3 Calculation and expression of results A3.1 Graphical method A3.1.1 Take the ethylene content of different standard samples as the horizontal axis and the corresponding peak ratio RMo as the vertical axis to draw a graph on a single logarithmic coordinate paper to obtain a working curve. A3.1.2 From the working curve, use the RM value of A2.6 to find the corresponding Ethylene content, calculation method A3.2 (arbitration method)
From A2.6:
Peak value at 2860cm\
Peak value at 606cm
L,R+1.733
w,·28.05
w·28.05+(100-w)86.09
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Where: wi-
HG/T2405—92||t t||Ethylene content of the sample, % (mol/mol);
Ethylene content of the sample, % (m/m);
Intercept of the working curve;
-Slope of the working curve;
-Molar mass of ethylene, g/mol;
86.1-Molar mass of ethyl acetate, g/mol.A4 Test report
The results should be expressed to one decimal place;
The results are generally expressed as the mass percentage of ethylene; This method belongs to the relative quantitative method, and the absolute error is ±1%. Appendix B
Dilution stability determination method
(Supplement)
B1 Summary of the method
The sample is diluted to reduce the concentration of protective colloid of vinyl acetate-ethylene copolymer latex adhesive, and the degree of precipitation of the test latex particles under the action of gravity field. Www.bzxZ.net
B2 Instruments and devices
Electric centrifuge;
b. Graduated centrifuge tube, 10mL.
B3 Operation steps
In a 100mL beaker, weigh 20±0.2g of the emulsion sample, add 20mL of distilled water to the sample, mix well, add the mixed emulsion sample to the 10mL scale line of two graduated centrifuge tubes, centrifuge at 2500-2600r/min for 4±0.1min. Take out the centrifuge tube, pour out the upper solution, continue to drain for about 10s, and record the average volume of the retained sediment, accurate to 0.1mL.
B4 Calculation of test results
Volume ratio of sediment (%)
Where: 0.5—dilution ratio;
Calculation result is rounded to two significant figures.
B5 Test report
Express dilution stability as a percentage of sediment volume. Average volume of sediment
Effective volume of centrifuge test tube×0.5
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HG/T2405-92
This standard is 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 drafted by Beijing Organic Chemical Plant. The main drafters of this standard are Yang Xuedong and Li Zongyu. Standard Investment Network MB Products.c People's Republic of China
Chemical Industry Standard
Vinyl acetate-ethylene copolymer emulsion adhesive HG/T2405-92
Editor Chemical Industry Standard Editorial Department
(Standardization Research Institute of Ministry of Chemical Industry)
Postal Code: 100013
Printing Standardization Research Institute of Ministry of Chemical Industry
Copyright reserved. No reproduction allowed
Format 880×12301/16 Printing Sheet 7/6 Number of Words 8000 First Edition January 1993
First Printing January 1993
Printing 1500
Standard Investment Network m.bx Products.c HG/T 2405--92
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