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Chemical Industry Standard of the People's Republic of China
HG2233—91
Copolymer oxymethylene resin
Published on December 27, 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
Copolymer oxymethylene resin
Subject content and scope of application
HG2233—91
This standard specifies copolymer oxymethylene resin Technical requirements, test methods, inspection rules and marking, packaging, transportation and storage requirements
This standard applies to copolymerized oxymethylene resins prepared by bulk polymerization with trioxymethylene and suitable comonomers as raw materials. ·2 Reference standards
GB1033
GB1040
GB1043
GB1634
GB1843
GB2918
GB3682
GB4 608
GB6678
GB6679
GB9341
3Product model
Test method for density and relative density of plastics
Test method for tensile test of plastics
Impact test method for cylindrical beam of plastics
Test method for heat deformation temperature (abbreviated as heat deformation temperature) of plastic bending loadImpact test method for cantilever beam of plastics
Standard environment for conditioning and testing of plastic specimensFlow rate of thermoplastic melt Test method for melt flow rate Test method for partially crystalline polymer melting point Optical method General rules for sampling of chemical products,
General rules for sampling of solid chemical products
Test method for bending properties of plastics
The product models in this standard are divided into the following eight models according to the melt flow rate: M10, M25, M60, M90, M120, M160, M200, M270.
4 Technical requirements
The appearance of copolymer formaldehyde resin is milky white or light yellow particles, and the particles should be uniform and bright. 4.2 Physical and chemical properties
The physical and chemical properties of copolymer formaldehyde resin shall conform to the technical indicators specified in the table. Approved by the Ministry of Chemical Industry of the People's Republic of China on December 27, 1991 and implemented on July 1, 1992
Density, g/cm
Melt flow rate, nom/10min
Melting point, ℃
Heat deformation temperature (1.82MPa), C
Tensile yield strength, MPa
Elongation at break, %
Simply supported beam, unnotched, lm/m
Cantilever beam, notched, J/m
Flexural modulus of elasticity, 10°MPa
5 Test methods
5.1 Appearance inspection
Visual inspection.
5.2 Determination of density
HG2233-
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Use the method specified in GB1033 B method to carry out 5.3 Determination of melt flow rate
The method specified in GB3682 is used for determination. 5.4 Determination of melting point
The method specified in GB4608 is used for determination. It can also be determined by the method specified in Appendix A. However, the provisions of GB4608 shall prevail in arbitration.
5.5 Determination of heat deformation temperature
The method specified in GB1634 is used for determination. The maximum normal bending stress of the specimen after loading is 1.82MPa. 5.6 Determination of tensile yield strength and elongation at break is carried out by the method specified in GB1040. The specimen is type I and the test speed is D gear. The specimen state adjustment and the standard test environment are carried out according to the method specified in Article 2.1 of GB2918. The state adjustment time is not less than 16h. 5.7 Determination of simply supported beam impact strength
The method specified in GB1043 shall be adopted for determination. The specimen shall be a large specimen without a notch. The specimen state adjustment and the standard test environment shall be the method specified in Article 2.1 of GB2918. The state adjustment time shall be not less than 16 hours. 5.8 Determination of cantilever beam impact strength
The method specified in GB1843 shall be adopted for determination. The specimen state adjustment and the standard test environment shall be the method specified in Article 2.1 of GB2918. The state adjustment time shall be not less than 16 hours. 5.9 Determination of flexural elastic modulus
The method specified in GB9341 shall be adopted for determination. 6 Inspection rules
HG2233-91
6.1 The same batch of resins produced by the same production line and mixed evenly by a mixer shall be a batch. 6.2 The sampling unit shall be the provisions of GB6678. The number of sampling units shall be calculated by packaging bags. The sampling method shall be the provisions of GB6679. Mix and reduce the obtained samples to the required amount for the test, which shall not be less than 4kg. 6.3 Each batch of products must be inspected by the quality inspection department of the manufacturer, and ensure that all products leaving the factory meet the technical requirements specified in this standard.
6.4 In this standard, appearance, melt flow rate, tensile yield strength, elongation at break, and simply supported beam impact strength are factory inspection items; density, melting point, heat deformation temperature, cantilever beam impact strength, and bending elastic modulus are random inspection items, which shall be inspected at least once a month. Type inspection shall be carried out in accordance with Article 6.6.1 of GB1.3. 6.5 If the user unit needs to inspect the received products, it shall be carried out in accordance with the provisions of this standard. Acceptance inspection shall be carried out within one month after receiving the product.
6.6 If a test result does not meet the requirements of this standard, samples should be taken from twice the number of packages in the batch of products, and the unqualified items should be retested and the grade should be determined based on the retest results. 6.7 When the supply and demand parties have objections to the product quality, they shall negotiate to resolve or the statutory quality inspection department shall conduct arbitration. 7 Marking, packaging, transportation, storage
7.1 Marking
Each batch of products leaving the factory should have a quality report. Each package should have a clear and firm mark indicating the product name, trademark, model, grade, net weight and manufacturer name
7.2 PackagingWww.bzxZ.net
The product should be packaged in a polyethylene film bag with a kraft paper polypropylene woven composite bag as the outer cover; or in a polyethylene film bag with a polypropylene woven bag as the outer cover. The net weight of each bag is 25kg. Each packaging bag should have a quality certificate and indicate the production date and the number of this standard. 7.3 Transportation
During transportation, the product should be protected from sunlight and moisture. The packaging should not be damaged during loading and unloading. This product is non-dangerous goods.
7.4 Storage
The product should be stored in a dark, dry and clean room. It should not be close to heaters or other heat sources and should be stored separately according to model, batch number and grade.
A1 Scope of application
HG2233-91
Appendix A
Test method for melting point of polyoxymethylene resin DSC method
(Supplement)
This method is applicable to the determination of melting point of polyoxymethylene resin granular products A2 Principle
In a controlled atmosphere environment, under program-controlled heating and cooling rate conditions , the differential scanning calorimeter (DSC) is used to measure the differential scanning calorimetry (DSC) curve of polyoxymethylene resin. The intersection of the tangent line of the maximum inflection point of the rear edge of the melting endothermic peak and the extrapolated baseline corresponds to the melting point of polyoxymethylene resin. This method uses standard steel as internal standard to calibrate the measured temperature readings. A3 Instruments and equipment
A3.1 Differential scanning calorimeter (DSC): heating rate is 20~30C/min, 2~2.5C/min cooling rate is 2~25c/min; heat range is 5×4.189mJ/s. A3.2 Millivolt recorder: two records, minimum range 1mV/100 grid, A3.3 Sample pan: aluminum, diameter 5mm, height 5mm. A3.4 Blade.
A4 Test conditions
A4.1, reference material: α-alumina.
A4.2 Heating rate: 20~30℃/min initially, 2~2.5/min when the temperature reaches 140℃. Cooling rate: 2~2.5c/min.
A4.3 Heat range: 5×4.189mJ/s.
A4.4 Recorder: Paper feed rate is 30mm/min, range is 1mV/100 grids A4.5 Atmosphere: Nitrogen, flow rate is 10~20mL/min. A5 Test steps
A5.1 Take granular polyoxymethylene resin and place it on clean filter paper. Use a blade to cut a total of 5±0.3mg thin slices, place them flat on the sample tray, and place a piece of metal steel with a mass of 1~3mg. Open the sample cell of the DSC meter and move the sample tray to the sample cell. A5.2 Take another sample tray and place 5mg α-alumina powder. Then move this sample tray to another sample cell and close the sample cell.
A5.3 Turn on the power of the instrument and start heating. The heating rate is not higher than 30℃／min. When it is close to 140C, adjust the heating rate to 2℃/min and continue to heat up to 175℃. Then cool to 140℃ at 2℃/min, and then heat to 175℃ at 2℃/min. Use a recorder to record the melting endothermic DSC curves of metal indium and polyoxymethylene resin during the second heating process, as shown in Figure A1A5.4 Synchronously record the heating curve of the program-controlled temperature. A5.5 On the DSC curve, the tangent line of the maximum inflection point of the leading edge of the melting endothermic peak of the metal steel intersects with the extrapolated baseline, and the reading of the intersection on the heating curve is found at the corresponding point a.
A5.6 On the DSC curve, the tangent line of the maximum inflection point of the trailing edge of the melting endothermic peak of the polyoxymethylene resin intersects with the extrapolated baseline, and the reading of the intersection on the heating curve is found at the corresponding point b. .
HG2233
Figure A1 Schematic diagram of DSC curve of polyoxymethylene
A6 Expression of analysis results
A6.1 The melting point of polyoxymethylene is calculated according to formula (A1); T-156.6+(ba)
Wherein: T
Melting point of polyoxymethylene resin, C;
-Temperature reading corresponding to the melting point of metal indium, grid;-Temperature reading corresponding to the melting point of polyoxymethylene, grid; 156.6-Metal melting point (literature value), ℃;-Conversion factor on the recording paper, ℃/grid. The test results are expressed as the arithmetic mean of the two parallel measurements, retained to one decimal place. A6.2 Allowable difference
The difference between parallel determination results should not be greater than 0.5℃.A7 Report
The test report should include the following contents:
Material name, model, batch number;
Results calculated according to A6.1;
Tester, checker;
Test date.
Additional remarks:
HG2233-91
This standard was proposed by the Science and Technology Department of the Ministry of Chemical Industry of the People's Republic of China and was drafted by the Plastic Resin Products Branch (SC4) of the National Plastic Standardization Technical Committee. This standard was drafted by Shanghai Solvent Factory and Shijingou United Chemical Factory of Jilin Chemical Industry Company. The main drafters of this standard are He Weiliang, Ti Xunhong, Zhang Shuyan and Mei Cuifen. This standard adopts the copolymer part of the American Society for Testing and Materials standard ASTMD4181-85 "Specification for Polyoxymethylene (POM) Molding and Extrusion Materials".
Appendix A of this standard refers to the American Society for Testing and Materials standard ASTMD3418-85 "Test Method for Transition Temperature of Polymers-Thermal Analysis Method".
People's Republic of China
Chemical Industry Standard
Copolymer Acetal Resin
HG2233-91
Editor Chemical Industry Standard Compilation Department
(Standardization Research Institute of Ministry of Chemical Industry)
Postal Code: 100013
Indian Drama Standardization Research Institute of Ministry of Chemical Industry
Copyright reserved. Reproduction is prohibited
Number of words on a sheet: 12000
Format: 880×12301/16
First edition in November 1992
First printing in November 1992
Number of prints: 1-500
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