HG/T 2724.1-1995 Test method for rubber thread. Test on the effect of washing on rubber thread HG/T2724.1-1995 Standard download decompression password: www.bzxz.net

This standard is equivalent to the international standard ISO2321:1983 "Rubber thread - Equivalent to the international standard in technical content and equivalent to the international standard in writing rules. - Test methods" Part 16 was formulated. By adopting international standards, the test methods suitable for rubber thread in my country are formulated, laying the foundation for the formulation of product standards in the future and adapting to the needs of international trade, technology and economic exchanges as soon as possible. In the standard detergent composition, TSO2321 stipulates that 0.5 g of anhydrous sodium silicate (Na2O: SiO2 = 1: 2) is required per liter of distilled water solution, while my country only produces sodium silicate (Na2O: SiO2 = 1.03 ± 0.03). If it is imported from abroad, it is neither economical nor convenient, so we use sodium silicate (1.1634 g) instead of anhydrous sodium silicate (0.5 g). This standard was 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 Latex Industry Research Institute of the Ministry of Chemical Industry. Drafting unit of this standard: Latex Industry Research Institute of Ministry of Chemical Industry, main drafters of this standard Xia Yingyuan Wen Sizheng Laihua Foreword
ISO
ISO (International Organization for Standardization) is a world-wide joint organization of national standards associations (TSOD member groups). The work of formulating international standards is carried out through ISO technical committees. All member bodies interested in the projects established by the technical committees have the right to participate in the committee. All governmental and non-governmental international organizations that have relations with ISO can participate in this work. The draft international standards adopted by the technical committees should be sent to the member groups for approval before they can be approved as international standards by the ISO Council.
International Standard ISO 2321 was prepared by ISO/TC45* Rubber and Rubber Products\Technical Committee. This second edition was submitted to the ISO Council in accordance with Section 6, 11.2 of Part 1 of ISO Technical Work Guidelines. The second edition replaces the first edition (i.e. ISO2321:1975) and is approved by the following national member groups. Belgium
Bulgaria
Canada
Czechoslovakia
Federal Republic of Germany
Ireland
Israel
Italy
The following member countries have expressed disapproval of this document for technical reasons: United States
Portugal
Romania
This International Standard also replaces Annex 1—1975, Annex 2—1980 and Annex 3—1980. 1 Scope
Chemical Industry Standard of the People's Republic of China
Test methods for rubber threads
Test for the effect of washing on threads
This standard specifies the test method for the effect of washing on rubber threads. This standard is applicable to threads made of natural rubber and synthetic polyisoprene rubber. 2 Referenced standards
HG/T 2724. 1 — 1995
c4v ISO 2321: 1983
The following standards contain provisions which, through reference in this standard, constitute provisions of this standard. At the time of publication, the versions indicated are valid. All standards are subject to revision. Parties using this standard should investigate the possibility of using the latest versions of the following standards. GB2941-91 Standard temperature, humidity and time for conditioning and testing of rubber test environments (cgvISO471:1983.eqvIs01826:1981)
Rubber hot air aging test method (negISO188:1977) GB/T 3512--83 (89)
3 Overview
3.1 Rubber threads or their coverings are often subjected to washing treatment with detergents of different compositions and washing liquids of different humidity. This test can determine the effect of washing on rubber threads.
3.2 The rubber threads are washed with standard washing liquid, then dried and aged, and the percentage retention of the selected physical properties is measured. 3.3 This test is only of comparative significance and cannot be linked to the actual service life of the rubber thread or its coating. 4 Principle
4.1 Use appropriate test methods to determine the selected physical properties of the rubber thread. Take out the specimens from the same sample, maintain 100% elongation, and conduct washing, air-drying and hot air aging tests. Then determine the selected physical properties and record the retention percentage. 4.2 The physical properties selected for the test can be tensile strength, elongation at break, Schwartz value, elongation at constant load, and stress retention rate. The most suitable test is Schwarlz value or stress retention rate. 5 Apparatus
5.1 The apparatus should comply with the provisions of the selected physical property test method. 5.2 The fixture should be suitable for maintaining 100% elongation of the specimen. Glass or stainless steel fixtures suitable for washing and painting can be selected; the aging test fixture should be made of low thermal expansion and low heat capacity materials. 5.3 Standard textile washing wheels or other devices that can maintain the washing solution at an appropriate temperature. When the straightened specimen is completely immersed in the washing solution, the washing solution should be slightly stirred: If a standard textile washing wheel is used, the fixture must be securely fixed in the basin to avoid damage to the rubber thread during stirring.
5.4 The circulating hot air oven complies with the provisions of GB/T3512, approved by the Ministry of Chemical Industry of the People's Republic of China on June 30, 1995 and implemented on January 1, 1996
6 Standard washing solution
HG/T2724.1-1995
6.1 The standard washing solution should contain the following ingredients in each distilled water solution: 1. 0 g sodium dodecylbenzene sulfonate;
1. 5g anhydrous sodium tripolyphosphate;
0.5g sodium perborate;
:1.1634g sodium silicate nonahydrate (Na,0:SiOz=1.03±0.03)12;1. 0g anhydrous sodium sulfate;
0.0086g copper sulfate pentahydrate,
6.2 Within 1h of the washing test, dissolve 2.0g of sodium perborate in 98.0g of distilled water at room temperature to prepare a sodium perborate solution. Just before the sample is immersed, add 25g of this solution to 975% of the solution containing all other chemicals and heated to the washing temperature.
6.3 Use 100g of standard washing solution for every gram of rubber thread. If the amount of washing solution required to satisfy the test sample exceeds this ratio, the rubber thread should be taken from the same sample and added to the solvent to maintain this ratio. Test steps
7.1 Place the sample in accordance with the provisions of GB2941.
7.2 Use appropriate test methods to take the specified number of samples to determine the initial values ​​of the selected physical properties. 7.2.1 If the Schwatiz value is determined, the maximum pre-elongation limit should be 300% to avoid excessive damage to the sample during the pre-elongation period after aging.
7.2.2 If the stress retention rate is to be determined, the rubber wire should be pre-lengthened to 300% and cycled six times before being stretched to 100% for measurement.
7.3 Move the specimen that has been stretched to 100% to a stainless steel or glass fixture and leave it for 60±10 min in accordance with the provisions of GB2941. 7.4 Wash each type of rubber wire in a separate washing tank filled with standard washing solution at a solution temperature of 85±1°C for 1 h, and stir the washing solution slightly.
7.5 Remove the fixture from the solution, rinse with tap water for 10 min, then wipe dry with a towel and dry at room temperature for 110 min. 7.6 Move the specimen that is still at 100% elongation to a Aging test fixture on the aging test, and make the stress in the rubber wire ring balanced, put it in the circulating hot air oven, age at 125 ± 1 ° C for 4h. Before the sample is loaded, the oven should be stabilized at the test temperature. When loading the sample, the temperature should not drop sharply. Use a high heat capacity oven and the sample loading time is the shortest. 7.7 Take out the sample from the oven and keep it for at least 16h as specified in GB2941. 7.8 According to the test method used before washing and aging, re-measure the selected physical properties. When the sample is damaged at an incorrect bundling point, the test should be repeated.
8 Result expression
The retention percentage of the initial value of the selected physical property is calculated as follows: X,bZxz.net
Where: X. ———Performance value before washing and aging; X——Performance value after washing and aging
Instructions for use:
1) ISO 2321:1983 stipulates 0.5g anhydrous sodium silicate (Na,O:SiO,1:2), which is not produced in my country at present. 6
Test report
The test report should include the following contents:
Source of sample and identification mark;
Based standard and standard number;
HG/T 2724. 1 - 1995
Selected physical properties, adopted test methods and equipment used; Retention percentage of physical properties and its initial value: Test date:
Tester.
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