HG/T 2724.2-1995 Test method for rubber threads - Determination of resistance to copper contamination during washing HG/T2724.2-1995 Standard download decompression password: www.bzxz.net

Chemical Industry Standard of the People's Republic of China
HG/T2724.2-1995
cqv ISO 2321: 1983
Test method for rubber thread
Determination of resistance to copper contamination during washing
Issued on June 30, 1995
Ministry of Chemical Industry of the People's Republic of China
Implementation on January 1, 1996
This standard is equivalent to Part 14 of the international standard ISO2321:1983 "Rubber thread-Test method", and an extensive survey was conducted nationwide on the reagents and materials required for the formulation of this standard. It was found that there are certain differences between the actual situation in my country and the international standard. One is the difference in reagents. The international standard requires the concentration of ammonia water (AR) to be 280 g/L, while the current ammonia water (AR) sold in my country is 228 g/L; the second is that acetate fiber is required in the material for sample preparation, but my country does not have a production base for acetate fiber, and has not developed a standard acetate fiber fabric. Therefore, acetate red fiber samples are not used in this standard. Due to the above two reasons, this standard is equivalent to the tenth part of ISO2321:1983 "Rubber Thread - Test Methods", and has made editorial changes in the text structure and expression. This standard specifies the method for determining the copper pollution resistance of rubber thread during washing. This standard is used to determine the amount of pollution and discoloration of adjacent textile materials when the rubber thread is washed in water containing copper salts. This test is only of comparative value and cannot indicate the accurate performance of the rubber thread, because the steel content in civil water varies greatly. By adopting international standards, the current situation of no test method for the copper pollution resistance of rubber thread in my country's production enterprises can be changed, in order to improve the quality level of my country's rubber thread and lay a solid foundation for my country's rubber thread export and earning foreign exchange. This standard is proposed by the Technical Supervision Department of the Ministry of Chemical Industry of the People's Republic of China, and 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, Ministry of Chemical Industry. The main drafters of this standard are Shi Lei and Li Meiyao. ISO Foreword
ISO (International Organization for Standardization) is a worldwide federation of national standards associations (TSO member groups). The work of formulating international standards is carried out through ISO technical committees. Any member group interested in the items established by the technical committee has 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 all member groups for their approval before they can be issued by the ISO Council for approval as international standards. Who
International Standard ISO2321 was prepared by ISO/TC45\Rubber and Rubber Products\Technical Committee. This second edition was submitted directly to the TSO Council in accordance with Section 6.11.2 of Part 1 of the ISO Technical Working Guidelines. This second edition replaces the first edition (i.e. ISO 2321:1975) and has been approved by the following national member bodies. Portugal
Belgium
BulgariabZxz.net
Canada
Czechoslovakia
Federal Republic of Germany
Ireland
Israel
Italy
For technical reasons the following national members have expressed disapproval of this document: 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
Determination of resistance to copper contamination during washing
This standard specifies the method for determining the resistance of rubber threads to copper contamination during washing. This standard applies to threads made of natural rubber and synthetic polyisoprene rubber. 2 Reference standards
HG/T 2724.2—1995
eqyISO2321:1983
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. At the time of publication of the standard, the versions shown are valid. All standards will be revised. Parties using this standard should explore the possibility of using the latest versions of the following standards: GB250—84 Grey scale for evaluating color change (idtISO105/A02:1978) GB 251—84 Grey scale for evaluating staining (it ISO 105/A 03:1978) GB2941-91 Rubber test specimen environmental conditioning and test standard temperature, mixing and time (cqvISO471:1983, eqvIso 1826: 1981)
3 Principle
The rubber thread and textile are formed into a tight combination sample, placed in a washing liquid containing a known amount of steel, heated at a specified time and temperature, and after washing and drying, the staining of the textile and the discoloration of the rubber thread are evaluated with a gray sample card, thereby determining the resistance of the rubber thread to copper pollution during washing.
4 Reagents
This test uses analytically pure reagents, and deionized water or double distilled water prepared in a full glass steamer is used to prepare the solution. 4.1 Steel, equivalent to a standard solution of 1 mg copper/mL: weigh 3.928 g of copper sulfate pentahydrate (CuSO,5H,0) and dissolve it in a small amount of water, add 125 mL of 25% ammonia water1) and transfer quantitatively to a 1000 mL volumetric flask, dilute with water to the mark and shake well. 4. 2 Copper, equivalent to 5 ug copper/mL standard solution: transfer 5mL copper standard solution (4.1) into a 1000mL volumetric flask, dilute to the mark with water, shake well. This solution should be prepared before use.
4.3 Soap standard solution:
dissolve 10g sodium hydroxide in 100mL water, add 500mL near-boiling water, add 70.5% oleic acid while stirring, and heat to 70°C. When the foam gradually disappears, transfer the solution to a 1000mL volumetric flask after cooling, dilute to the mark with water and shake well. Instructions for use:
1) ISD2321:1983 stipulates that the concentration of nitrogen water (AR) is 280g/L, while the concentration of analytical pure nitrogen water produced in my country at this stage is 228g/L. Therefore, this standard uses nitrogen water with a concentration of 228/L (25%). Approved by the Ministry of Chemical Industry of the People's Republic of China on June 30, 1995 and implemented on January 1, 1996.
4.4 Sodium dodecylbenzene sulfonate,
5 Instruments and materials
5.1 Aluminum plate: 50mm×50mm×3mm.
HG/T 2724.2—1995
5.2 Degree meter: 0～100℃, graduation value is 0.2℃, 5.3 Electric constant temperature water bath.
5.4 Beaker: 250 mL.
5.5 Volumetric flask: 1 000 mL.
5.6 Pipette: 5 mL, 1 mL.
5.7 Grey sample card:
The grey sample card for evaluating discoloration shall comply with the requirements of GB250, and the grey sample card for evaluating staining shall comply with the requirements of GB251. 5.8 Textile samples:
Polyamide (nylon), viscose textile yarn and standard adjacent fabric, or multi-fiber standard adjacent fabric (SW type) 1) The specification of standard adjacent fabric is 40mm×100mm 6 Combined sample and preparation
Each combined sample shall be composed of a tight combination of 0.5~1.0g rubber thread and textile. The textile shall not have surface modifiers that affect color difference. The extractable matter in the textile shall not exceed 0.3% (m/m) For a certain rubber thread to be tested, according to the available textile samples, the sample can be prepared according to the provisions of 6.1 and 6.2, or according to the provisions of 6.3.
6.1, single fiber standard adjacent fabric Fabric sample
Take 0.5~1.0g of 75mm long rubber thread, place it on a piece of polyamide fabric, then cover it with a piece of viscose fabric, then roll it into a round hanging body perpendicular to the length of the rubber thread, and tie it with cotton thread to form a combined sample. 6.2 Single fiber textile yarn sample
Take 0.5~1.0g of rubber thread about 100mm long, and then take a bundle of polyester amide and viscose yarn of equivalent length, tie the upper ends of these three bundles with cotton thread, and then braid them into a braid about 75mm long, and tie the other end with cotton thread to form a combined sample. 6.3 Multi-fiber standard lining fabric sample
Wrap a 40mm×100mm multi-fiber fabric on both sides of the aluminum plate (5.1), and wrap 0.5~1.0g of rubber thread around the fabric so that it passes closely over each fiber and keeps the tension to a minimum to form a combined sample. 7 Test steps
7.1 Pour 200 mL of the standard steel solution (4.2) into a 250 mL beaker, add 1 mL of the standard soap solution (4.3) or 1 g of sodium dodecyl sulfonate (4.4).
7.2 Raise the test temperature to 70 ± 2°C, add a group containing the sample, stir the solution, and keep it at this temperature for 30 min7.3 Take out the combined sample, clean it with cold distilled water, and dry it naturally until the sample stops dripping. At the standard temperature specified in GB2941, place the sample on a surface and air dry it. 7.4 Take out the rubber thread and textile from the combined sample, and use the gray sample card to evaluate the color change of the rubber thread and the staining of each textile on the contact surface with the rubber thread.
Instructions for use:
1) ISO2321:1983 stipulates that acetate fiber is required in the materials required for sample preparation. At present, there is no acetate fiber production base and no standard acetate fiber adjacent fabric. Therefore, this standard uses SW multi-fiber. Result expression
HG / T 2724. 2 — 1995
The test results are expressed in the staining level of the textile and the color change level of the rubber thread. 9
Test report
The test report should include the following contents:
Source of sample and identification mark;
Based on standard;
Selected textile sample and detergent; test results
Test date:
Tester.
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