Halogen-free anti-flaming silicon rubber and its preparing method and use
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A silicone rubber, rubber technology
Active Publication Date: 2008-02-13
SHANGHAI HUITIAN NEW CHEMICAL MATERIALS CO LTD
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[0004] Patent application number 200410077503.5 discloses a silicone rubber with different vinyl content as the base material, adding hydrogen-containing silicone oil, hydroxyl silicone oil, reinforcing agent, metal hydroxide, and at least containing chloroplatinic acid, polytetrafluoroethylene One, the silicone rubber has excellent flame retardant performance, but because it contains halogen, it will have
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Embodiment 1
[0041] (1) 20 parts by weight of high vinyl content methyl vinyl silicone rubber with molecular weight 600000, vinyl molar content 0.23% and molecular weight 580000, 30 weight parts of low vinyl content methyl vinyl silicone rubber with vinyl molar content 0.08% The parts are mixed on the double-roller mill for 3 to 5 minutes, and the mixing is uniform;
[0042] (2) Add 0.4 parts by weight hydrogen-containing silicone oil, 4 parts by weight hydroxyl silicone oil and 25 parts by weight to the mixture of (1) successively. 2 / g of fumed silica, mixed evenly, to make rubber compound A;
[0043] (3) Mix 100 parts by weight of low vinyl content methylvinyl silicone rubber with a molecular weight of 580000 and a vinyl molar content of 0.08% on a double-roll mill for 3 to 5 minutes. Base silicone oil, 0.8 parts by weight of hydrogen-containing silicone oil, mixed evenly;
[0044] (4) Add 55 parts by weight of aluminum hydroxide and 5 parts by weight of zinc borate to the mixture of ...
Embodiment 2
[0047] Steps (1)-(4) are all the same as in Example 1.
[0048](5) Mix the mixed rubbers A and B prepared in (2) and (4), add solvent petroleum ether, mix the mixture with the solvent at a weight ratio of 1:2, add 1 part by weight of vulcanizing agent 2,5- Dimethyl-2,5-di-tert-butyl peroxide hexane, dispersed evenly on the glass fiber cloth by high-speed stirring, vulcanized on a flat vulcanizer at 180°C for 5 minutes, and then placed in an oven at 200°C for the second time Vulcanized for 2 hours, cooled and parked to obtain a halogen-free silicone rubber glass fiber cloth.
Embodiment 3
[0050] Other steps are the same as in Example 1 with uniform dosage, except that 55 parts by weight of aluminum hydroxide is changed to 55 parts by weight of melamine cyanurate, and vulcanized silicone rubber D is obtained through vulcanization.
[0051] Performance tests were performed on vulcanized silicone rubbers C and D (the flame retardant grade was tested according to GB / T13488-92), and the results are shown in Table 1.
[0052] Table 1
[0053]
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Abstract
A halogen-free flame retardant silicone rubber is made by the vulcanization of the compound with the methyl vinyl silicone rubber as the basic gel and the vulcanization agent; the compound consists of the two-component mixing gel; according to the weight shares, the compound includes: A component: 10 to 30 shares of methyl vinyl silicone rubber with the high content of vinyl, 20 to 40 shares of methyl vinyl silicone rubber with the low content of vinyl, 0.25 to 1 share of hydrogen silicone oil, 2 to 4 shares of hydroxy silicone oil, 20 to 40 shares of white carbon; B component: 90 to 110 shares of methyl vinyl silicone rubber with the low content of vinyl, 0.5 to 2 shares of methyl silicone oil, 0.25 to 1 share of hydrogen silicone oil, 50 to 70 shares of aluminum hydroxide and virgule or cyanuric melamine, and 2 to 5 shares of zinc borate. The preparation method is to mix and refine well the silicone rubber with the high and low content of vinyl; the hydrogen silicone oil, hydroxy silicone oil and white carbon are added to make the mixed and refined gel A; the silicone rubber with the low content of vinyl, the methyl silicone oil, hydrogen oil, aluminum hydroxide and virgule or cyanuric melamine, zinc borate are added to make the mixed and refined gel B; the mixed and refined gel A and B are mixed and vulcanized ; the fire-retardant performance can reach to the level of FV-0.
Description
technical field [0001] The invention relates to a halogen-free flame-retardant silicone rubber and its preparation method and application, in particular to a halogen-free flame-retardant silicone rubber for coating fiber cloth. Background technique [0002] Flame-retardant silicone rubber has a wide range of applications. Patent No. ZL97107706.1 discloses a room temperature vulcanized flame-retardant silicone rubber prepared with melamine cyanurate or melamine cyanurate and decabromodiphenyl ether as a flame retardant. When it has good self-extinguishing property, it is proposed that when the addition amount is less than 5 parts by weight, the self-extinguishing effect is poor, and when it is more than 100 parts by weight, the process performance of the composition is obviously deteriorated, which provides a basis for future research and development. But its flame retardant performance has certain limitations. [0003] Coating with flame-retardant silicone rubber, such as g...
Claims
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