High-anti-yellowing silicon rubber compound and preparation method thereof

A technology of raw silicone rubber and silicone rubber, applied in the field of silicone rubber, can solve the problems of affecting the appearance of the product, the effect is not particularly obvious, restricting the application of silicone rubber, etc., to achieve the effect of expanding the use environment

Inactive Publication Date: 2012-10-03
阳江市小天星实业有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the fact that raw materials for the production of silicone rubber and additives generally contain trace amounts of metal elements and NO - 3 , and it is precisely because of these trace metal elements and NO - 3 It leads to serious yellowing of silicone rubber during the vulcanization process, especially after secondary vulcanization, which directly affects the appearance of the product
Limit the application of silicone rubber in lighting, solar photovoltaic sealing industry
Researchers have done a lot of research in this area before, using many anti-yellowing additives, but the effect is not particularly obvious

Method used

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  • High-anti-yellowing silicon rubber compound and preparation method thereof
  • High-anti-yellowing silicon rubber compound and preparation method thereof

Examples

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Comparison scheme
Effect test

preparation example Construction

[0023] A kind of preparation method of aforementioned high anti-yellowing silicone rubber compound, comprises the following steps:

[0024] 1) Put the silicone rubber raw rubber, hydroxy silicone oil, zinc stearate, release aid, hydrogen-containing silicone oil and anti-yellowing additive pyrophosphoric acid in the aforementioned parts by weight into a kneader and stir for 5-10 minutes, then divide Add white carbon black in batches and knead into a dough. After kneading evenly, raise the temperature to 150-180°C, banbury for 0.5-4h at a vacuum degree of 0.05-0.07MPa, and finally cool down to below 80°C and filter to obtain silicone rubber. glue;

[0025] 2) Let the above-mentioned mixed rubber stand still, then add a vulcanizing agent to the open mill for reverse milling, and then carry out one-stage vulcanization and two-stage vulcanization, and measure the mechanical properties of the first-stage vulcanization and two-stage vulcanization of the silicone rubber compound accor...

Embodiment 1

[0027] Example 1: The average degree of polymerization is 10000, the vinyl content is 100 parts by weight of methyl vinyl raw rubber of 0.22 mol%, 9 parts of hydroxyl silicone oil, 0.5 part of zinc stearate, 3 parts of hydrogen-containing silicone oil and anti-yellowing Pyrophosphoric acid (concentration: 600-800ppm) 0.01 part of the auxiliary agent is put into the kneader and stirred for 5-10 minutes at a time, and then added in 40 parts by mass in three times. The specific surface area (BET method) is at least 150m 2 / g of fumed silica is kneaded into agglomerates, and after kneading evenly, start to heat up, and when the temperature of the rubber material rises to about 160°C, start vacuuming, keep the vacuum within 0.05-0.07MPa, banbury for 0.5-4h, after the vacuum is over When the temperature is lowered to below 80°C, the material is discharged, filtered, and packaged to obtain a rubber compound.

[0028]100 parts by weight of this silicone rubber compound, mix and disper...

Embodiment 2

[0029] Example 2: the average degree of polymerization is 10000, the vinyl content is 100 parts by weight of methyl vinyl raw rubber of 0.22 mol %, 9 parts of hydroxyl silicone oil, 0.5 part of zinc stearate, 3 parts of hydrogen-containing silicone oil and anti-yellowing Pyrophosphoric acid (concentration: 600-800ppm) 0.05 parts of the auxiliary agent is put into the kneader for 5-10 minutes at a time, and then added in 40 parts by mass in three times. The specific surface area (BET method) is at least 150m 2 / g of fumed silica is kneaded into agglomerates, and after kneading evenly, start to heat up, and when the temperature of the rubber material rises to about 160°C, start vacuuming, keep the vacuum within 0.05-0.07MPa, banbury for 0.5-4h, after the vacuum is over When the temperature is lowered to below 80°C, the material is discharged, filtered, and packaged to obtain a rubber compound. In the same manner as in Example 1, the vulcanization test was carried out on the sili...

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Abstract

The invention discloses a high-anti-yellowing silicon rubber compound which is characterized by comprising the following raw materials by weight: 100 parts of raw silicon rubber, 1-20 parts of hydroxy silicone oil, 20-70 parts of white carbon black, 0.1-3 parts of zinc stearate used as an inner release agent, 1-10 parts of hydrogen-containing silicone oil and 0.01-0.5 part of pyrophosphoric acid used as an anti-yellowing assistant. The invention also discloses a preparation method of the high-anti-yellowing silicon rubber compound. The high-anti-yellowing silicon rubber compound and the preparation method have the advantages that on the basis of not reducing the physical and mechanical properties of the silicon rubber compound, the high-anti-yellowing silicon rubber compound is good in anti-yellowing capability, good in processability and good in physical and mechanical properties.

Description

technical field [0001] The invention relates to the technical field of silicone rubber, in particular to a high anti-yellowing silicone rubber compound and a preparation method thereof. Background technique [0002] Silicone rubber is a kind of polymer material with both inorganic and organic properties. Compared with ordinary rubber, silicone rubber has excellent heat resistance, cold resistance, weather resistance, electrical properties and physiological inertia, and is widely used in aerospace, electronic appliances, biomedicine and other fields. However, due to the fact that raw materials for the production of silicone rubber and additives generally contain trace amounts of metal elements and NO - 3 , and it is precisely because of these trace metal elements and NO - 3 This leads to severe yellowing of silicone rubber during the vulcanization process, especially after secondary vulcanization, which directly affects the appearance of the product. It limits the applic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08L83/04C08K13/02C08K3/36C08K5/5415C08K3/32C08K5/098
Inventor 葛建芳黄春尧程少辉
Owner 阳江市小天星实业有限公司
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