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A method for detecting the vinyl content of low vinyl methyl vinyl silicone rubber

A technology of vinyl methyl ethylene and methyl vinyl silicon, which is applied in the field of detecting the vinyl content of low vinyl methyl vinyl silicone rubber, can solve the deviation of the results, cannot accurately reflect the vinyl content of vinyl 110 silicone rubber, The operation is cumbersome and other problems, to achieve the effect of fast detection

Active Publication Date: 2021-02-02
HUBEI XINGRUI SILICON MATERIAL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the industry product analysis of 110 methyl vinyl silicone rubber in my country refers to the industry standard HG / T 3312-2000 "110 methyl vinyl silicone rubber". The analysis method of vinyl content is the iodine bromide method, which is cumbersome to operate. It involves multiple titrations and the titration process needs to be shaken vigorously all the time, otherwise the incomplete reaction will lead to large deviations in the results. The detection time is as long as 5 hours, and the error range of the detection results is ±0.02%, which cannot accurately reflect 0.03%~0.06% low vinyl 110 silicon Vinyl content of rubber
[0004] 110 silicone rubber has a linear structure before vulcanization, has fluidity, and does not have rubber properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 200g of 110 silicone rubber and 2g of di-tert-butyl peroxide were mixed evenly on a two-roll mill, the temperature and pressure of the flat vulcanizer were set to 180°C and 10MPa, respectively, and 50g of the mixed rubber was weighed and placed on the mold. It is vulcanized and formed on a flat vulcanizing machine. After the sample is cooled, its hardness is measured by a Shore hardness tester to be 12°A, that is, the vinyl content of the measured 110 silicone rubber is 0.03%.

Embodiment 2

[0026] 100g of 110 silicone rubber and 2g of dicumyl peroxide were mixed evenly on a two-roll mill, and the temperature and pressure of the flat vulcanizer were set to 160°C and 15MPa, respectively, and 50g of the mixed rubber was weighed and placed on the mold. It is vulcanized and formed on a flat vulcanizing machine. After the sample is cooled, its hardness is measured by a Shore hardness tester to be 11°A, that is, the vinyl content of the measured 110 silicone rubber is 0.03%.

Embodiment 3

[0028] 100g of 110 silicone rubber and 2g of 2.5-dimethyl-2.5-tert-butyl hexane peroxide were mixed evenly on a two-roll mill, and the temperature and pressure of the flat vulcanizer were set to 170°C and 12MPa, respectively, and 50g was weighed. The mixed rubber is placed on the mold and vulcanized on a flat vulcanizer. After the sample is cooled, its hardness is measured by a Shore hardness tester to be 12°A, that is, the measured vinyl content of 110 silicone rubber is 0.03%.

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PUM

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Abstract

The invention relates to a method for detecting the vinyl content of low vinyl methyl vinyl silicone rubber (referred to as "110 silicone rubber"). Molding, testing the Shore hardness, and obtaining the vinyl content according to the Shore hardness. The traditional detection method is the iodine bromide method, that is, the addition color reaction. This method is cumbersome to operate, takes a long time to detect (5 hours), and has a large detection deviation (±0.02%), especially for low vinyl content of less than 0.06%. Base 110 silicone rubber cannot be effectively identified. The new method for detecting the vinyl content of 110 silicone rubber is the application method, that is, the network structure is formed by vulcanization and cross-linking, and the vinyl content is reflected by the hardness. This method has the advantages of rapid evaluation, simple operation and direct application, and can more intuitively guide customers to use the product.

Description

technical field [0001] The invention relates to a method for detecting the vinyl content of low vinyl methyl vinyl silicone rubber. Background technique [0002] The downstream products of compound rubber have huge demand for low vinyl content 110 silicone rubber, mainly low-hardness products, which are mixed with high vinyl content silicone rubber to improve the performance of compound rubber. Vinyl content and is strict. [0003] At present, the industry product analysis of 110 methyl vinyl silicone rubber in my country refers to the industry standard HG / T 3312-2000 "110 methyl vinyl silicone rubber". The analysis method of vinyl content is the iodine bromide method, which is cumbersome to operate. It involves multiple titrations and the titration process needs to be shaken all the time, otherwise the reaction is not complete, resulting in large deviations in the results. The detection time is as long as 5 hours, and the error range of the detection results is ±0.02%, whic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/40
CPCG01N3/40G01N2203/0076G01N2203/0098
Inventor 孙刚陈泽雨张光荣李迪田桂林
Owner HUBEI XINGRUI SILICON MATERIAL CO LTD
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