Method for determining vinyl content of low-vinyl methyl vinyl silicone rubber

A technology of vinyl methyl vinyl and methyl vinyl silicon, which is applied in the field of detection of vinyl content of low vinyl methyl vinyl silicone rubber, can solve the deviation of results, does not have rubber characteristics, and cannot accurately reflect vinyl 110 silicon Problems such as rubber vinyl content, to achieve the effect of fast detection speed

Active Publication Date: 2018-02-06
HUBEI XINGRUI SILICON MATERIAL CO LTD
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  • Summary
  • 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] Mix 200g110 silicone rubber and 2g di-tert-butyl peroxide evenly on a double-roller open mill, set the temperature and pressure of the flat vulcanizer to 180°C and 10MPa respectively, weigh 50g of the mixed rubber and put it on the mold Vulcanize and form the sample on a flat vulcanizing machine. After the sample is cooled, use a Shore hardness tester to test its hardness to 12°A, that is, the vinyl content of the measured 110 silicone rubber is 0.03%.

Embodiment 2

[0026] Mix 100g110 silicone rubber and 2g dicumyl peroxide evenly on a double-roller open mill, set the temperature and pressure of the flat vulcanizer to 160°C and 15MPa respectively, weigh 50g of the mixed rubber and put it on the mold Vulcanize and form the sample on a flat vulcanizing machine. After the sample is cooled, use a Shore hardness tester to test its hardness to 11°A, that is, the vinyl content of the measured 110 silicone rubber is 0.03%.

Embodiment 3

[0028] Mix 100g110 silicone rubber and 2g2.5-dimethyl-2.5-tert-butylperoxyhexane evenly on a double-roller mill, set the temperature and pressure of the flat vulcanizer to 170°C and 12MPa respectively, and weigh 50g Put the mixed rubber material on the mold and vulcanize it on a flat vulcanizing machine. After the sample is cooled, use a Shore hardness tester to test its hardness to 12°A, that is, the vinyl content of the measured 110 silicone rubber is 0.03%.

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PUM

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Abstract

The invention relates to a method for determining the vinyl content of low-vinyl methyl vinyl silicone rubber (''110 silicone rubber'' for short). The method is characterized by comprising the steps of uniformly mixing the 110 silicone rubber with a vulcanizing agent, putting a rubber material on a mold for formation, detecting the Shore hardness, and determining the vinyl content according to theShore hardness. A traditional determination method is an iodine bromide method, namely addition developing reaction, and the traditional determination method has the disadvantages that the operationis tedious, the detection time is long (5 hours), the detection deviation is large (+ / -0.02%), and particularly, the low-vinyl 110 silicone rubber with the vinyl content lower than 0.06% cannot be effectively identified. A novel method for detecting the vinyl content of the vinyl 110 silicone rubber is an application method, namely that a network structure is formed through vulcanization and crosslinking, and the vinyl content is reflected by virtue of the hardness. The method disclosed by the invention has the advantages that the evaluation is rapid, the operation is simple, the application is direct, and meanwhile, the use of products by a client can be relatively visually guided.

Description

technical field [0001] The invention relates to a method for detecting the vinyl content of low-vinylmethylvinyl silicone rubber. Background technique [0002] The downstream products of compounded rubber have a 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 the compound rubber. These products have a great demand for low vinyl 110 silicone rubber Vinyl content and as stringent. [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 ...

Claims

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Application Information

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Patent Type & Authority Applications(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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