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Fire-retardant silicon rubber and its preparation method

A technology of silicone rubber and hydrogen-containing silicon, applied in the rubber field, can solve problems such as damage to the performance of silicone rubber, environmental hazards, and difficulty in vulcanization, and achieve the effects of improving flame retardancy, reducing dosage, and improving tear resistance.

Inactive Publication Date: 2005-07-20
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the above flame retardants can give silicone rubber a certain flame retardancy, all kinds of flame retardants have their own shortcomings.
For example, the use of brominated flame retardants such as decabromodiphenyl ether brings great harm to the environment and does not conform to the direction of the development of environmentally friendly materials. Developed countries such as Europe and the United States have begun to impose strict restrictions, and have seriously damaged the performance of silicone rubber itself. For example, mechanical properties decrease, vulcanization is difficult, and gelation occurs during storage; the mixed use of manganese carbonate and platinum compounds will hinder the full vulcanization of silicone rubber; when using inorganic flame retardants such as magnesium hydroxide and aluminum hydroxide, it is often necessary to Only a large amount of addition can play an effective flame retardant effect, which will seriously damage the processing performance and physical and mechanical properties of silicone rubber, especially the tearing performance

Method used

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  • Fire-retardant silicon rubber and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 96 parts by weight (phr) of methyl vinyl silicone rubber with a vinyl content of 0.3 mol% (the average degree of polymerization is 6500) and 4 phr of methyl vinyl silicone rubber with a vinyl content of 0.06 mol% (the average degree of polymerization is 5100 ) mixed evenly on the open mill, and then sequentially added 0.6phr hydrogen-containing silicone oil, 6phr hydroxyl silicone oil and 40phr specific surface area of ​​380m 2 / g of fumed silica, mixed evenly, and made into rubber compound A. Then add 45phr aluminum hydroxide and 15phr magnesium hydroxide to compound A, knead evenly, then heat treat at 150°C for 2 hours, cool to room temperature and carry out secondary re-milling, then add 2phr vulcanizing agent 2,5 -Dimethyl-2,5-di-tert-butylperoxyhexane, after mixing uniformly to obtain rubber compound B. Add 20 ppm of chloroplatinic acid to the rubber compound B to obtain the rubber compound C. Vulcanize compound B and compound C on a flat vulcanizing machine at 1...

Embodiment 2

[0039] The chloroplatinic acid used in the compound C in Example 1 was changed to 2.5 phr polytetrafluoroethylene powder to obtain sample D, and the results are shown in Table 2. It can be seen that adding polytetrafluoroethylene to silicone rubber can improve the flame retardancy and mechanical properties of silicone rubber.

[0040] Table 2 Effect of PTFE on properties of flame retardant silicone rubber

[0041]

Embodiment 3

[0043] According to the recipe and process in Example 1, by changing the consumption of chloroplatinic acid, the results are shown in Tables 3 and 4. It can be seen that with the increase of the amount of chloroplatinic acid, although the oxygen index of silicone rubber does not change much, the flame retardancy level gradually increases, and the tear strength of silicone rubber also increases. Considering the cost and performance of silicone rubber comprehensively, the optimal dosage of chloroplatinic acid is 20ppm (based on the amount of platinum).

[0044]Table 3 Effect of the amount of chloroplatinic acid on the flame retardant properties of silicone rubber

[0045] Dosage of chloroplatinic acid First combustion Second combustion Limiting oxygen index

[0046] Flammability rating

[0047] (ppm) Time (s) Time (s) (%)

[0048] 0 8 38 FV-1 38.0

[0049] 5 7 32 FV-1 38.1

[0050] 10 5 30 FV-1 38.2

[0051] 15 4 24 FV-0 38.2

...

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Abstract

The preparation process of fireproof silicone rubber includes the following steps: mixing silicone rubber with high vinyl group content and silicone rubber with low vinyl group content in double-roller opened mixer for 3-5 min while adding hydrogenous silicone oil and hydroxyl silicone oil; adding vapor phase white carbon black and mixing for 20-40 min to prepare high tearing silicone rubber mixture; adding aluminum hydroxide and magnesium hydroxide and mixing homogeneously; heat treatment at 140-180 deg.c for 1-4 hr and cooling; mixing for the second time, adding sulfurizing agent and platinum compound or fluoride and sulfurizing in a plate sulfurizing machine at 160-180 deg.c for 15-40 min to form rubber sheet; and sulfurizing in a stove at 160-200 deg.c for 1-4 hr. The prepared silicone rubber has excellent tearing resisting performance and fireproof performance, and may be used widely in electronic, electric, automobile, mechanical and other fields.

Description

technical field [0001] The invention relates to the field of rubber, in particular to an environment-friendly high-tear flame-retardant silicone rubber. The invention also relates to a preparation method of the flame-retardant silicone rubber. Background technique [0002] Silicone rubber has many excellent properties such as high and low temperature resistance, weather resistance, insulation and physiological inertia, and is widely used in various fields of the national economy. However, silicone rubber itself is flammable. For example, although the oxygen index of methyl vinyl silicone rubber reinforced with 40phr fumed silica reaches 24%, it can still burn continuously when exposed to an open flame. The flammability of silicone rubber limits its more applications in electrical and electronic, automotive, mechanical, aerospace and other fields. Therefore, it is of great significance to carry out research on flame retardant silicone rubber. ...

Claims

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Application Information

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IPC IPC(8): C08K3/22C08L83/00
Inventor 曾幸荣程买增罗昆张远江
Owner SOUTH CHINA UNIV OF TECH
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