Fluorine-silicon copolymer rubber and preparation method thereof

A technology of copolymerization and rubber, which is applied in the field of fluorosilicone copolymerization rubber and its preparation, which can solve the problems of cost reduction and poor low temperature resistance

Active Publication Date: 2008-08-27
SHANGHAI 3F NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] An object of the present invention is to provide a fluorosilicone copolymer rubber with good low temperature resistance, heat resistance, weather resistance and corrosion resistance, and certain oil resistance. It has a higher average molecular weight and a moderate molecular weight distribution. At the same time, it has

Method used

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  • Fluorine-silicon copolymer rubber and preparation method thereof
  • Fluorine-silicon copolymer rubber and preparation method thereof
  • Fluorine-silicon copolymer rubber and preparation method thereof

Examples

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preparation example Construction

[0030] The invention provides a kind of preparation method of fluorosilicone copolymer rubber, it comprises providing 3,3,3-trifluoropropylmethyl cyclotrisiloxane monomer (hereinafter referred to as D 3 F ) step, the 3,3,3-trifluoropropylmethylcyclotrisiloxane monomer (D 3 F ) has the following structural formula:

[0031]

[0032] In the formula, Me represents CH 3 -, Rf stands for CF 3 CH 2 CH 2 -.

[0033] The 3,3,3-trifluoropropylmethylcyclotrisiloxane monomer (D 3 F ) is commercially available, for example it can be purchased from Zhejiang Sanhuan Chemical Co., Ltd.

[0034] In the polymerization reactant, the 3,3,3-trifluoropropylmethylcyclotrisiloxane monomer (D 3 F ) in an amount of 100 parts by weight.

[0035] In a better example of the present invention, need to 3,3,3-trifluoropropylmethyl cyclotrisiloxane monomer (D 3 F ) for dehydration. The specific dehydration step comprises 3,3,3-trifluoropropylmethylcyclotrisiloxane monomer (D 3 F ) into th...

Embodiment 1

[0110] Polymerization step

[0111] 5kg octamethylcyclotetrasiloxane monomer (D 4 Me ), 30g methyl vinyl cyclotetrasiloxane monomer (D 4 MeVi ) was filtered through a 2# sand core funnel, and added to a pre-dried 30L stainless steel polymerization reactor. 5kg D 3 F Put it into the dehydrator, heat it with infrared lamps, and heat it with electricity in the kettle.

[0112] The material needs to be dehydrated separately before polymerization, and pre-dehydrated with dry N2, that is, D 4 Me Monomer and D 4 MeVi The monomer is dehydrated in a 30L stainless steel reactor. The dehydration conditions are negative pressure 9303Pa, 70°C, dehydration for 2 hours, D 3 F Add it into the feeding bottle for dehydration. The dehydration conditions are negative pressure 7974Pa, dehydration at 80°C for 2 hours, and then add 60g of the catalyst component (ammonium gum) prepared above under normal pressure into a 30L stainless steel reactor to continue dehydration for 1 hour. , s...

Embodiment 2

[0117] The procedure described in Example 1 was repeated except that the polymerization time was 40 minutes. Six points were taken at different positions of the obtained polymer to compare the molecular weight distribution, and the results are listed in Table 2.

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Abstract

The invention discloses a fluorine-containing silicon copolymer which comprises the fluorine-containing silicon copolymer which has the following general formula, wherein Me represents CH3-, Rf represents CF3 CH2 CH2-, wherein X/Y/Z=400-500/600-400/1-10, property molecular weight is 10-100 ten thousand, better is 30-80 ten thousand, molecular distribution parameter is 1-3, better is 1.2-1.8, and volatilization parts are less than 3%, and ethenyl chain link content is within 0.3-0.8%. And a preparation process of fluorine-containing silicon copolymer is disclosed.

Description

technical field [0001] The invention relates to a fluorosilicone copolymerized rubber and a preparation method thereof. In particular, it relates to a fluorosilicone copolymer rubber with good high-temperature and low-temperature stability, low cost, and easy industrialization and a preparation method thereof. Background technique [0002] Fluorosilicone homopolymer rubber (such as polymethyltrifluoropropylsiloxane) has good oil resistance, low temperature resistance, weather resistance and corrosion resistance. As a high-performance elastomer, it plays an important role in the aviation industry and the automobile industry. Applications. However, the main disadvantage of fluorosilicone homopolymer rubber (such as polymethyltrifluoropropylsiloxane) is its high price, and it is easy to decompose and produce low molecular weight rings under high temperature and sealed state, thus limiting its application. In addition, with the development of aviation technology, higher requir...

Claims

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Application Information

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IPC IPC(8): C08G77/24C08G77/50C08G77/20C08G77/08
Inventor 袁利兵姚亚中顾永平
Owner SHANGHAI 3F NEW MATERIAL TECH CO LTD
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