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Copolymerized liquid fluorosilicone rubber based on isopropanol extracting method

A technology of fluorosilicone raw rubber and isopropanol, applied in the field of polymer chemistry, can solve problems such as rubber decomposition and energy loss, and achieve the effects of reducing shrinkage rate, avoiding energy loss and improving thermal stability.

Inactive Publication Date: 2018-09-07
长春物恒新技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this process may cause part of the rubber to be decomposed, and even cause a lot of energy loss

Method used

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  • Copolymerized liquid fluorosilicone rubber based on isopropanol extracting method
  • Copolymerized liquid fluorosilicone rubber based on isopropanol extracting method
  • Copolymerized liquid fluorosilicone rubber based on isopropanol extracting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] In a nitrogen-protected container, add 10g tetramethylammonium hydroxide pentahydrate, 122g octamethylcyclotetrasiloxane, 120ml toluene, react at 85°C for 1 hour, stop heating and cool to room temperature, under reduced pressure, The toluene was slowly steamed at 70°C, and the toluene was continuously replenished during the distillation process. After 6 hours, the distillation was stopped and cooled to room temperature. The α,ω-diamine(tetramethylammonium)methylsiloxane (TMAc) initiator was obtained.

[0036] The proton nuclear magnetic resonance spectrum of TMAc was measured with a Bruker Advance 510 nuclear magnetic resonance instrument (300 MHz), and the deuterated CDCl 3 as the solvent, with TMS (tetramethylsilane) as the internal standard, the test results are shown in figure 1 . Depend on figure 1 It can be seen that TMAc has only one proton magnetic peak, and the peak position is at 2.38ppm. It was proved that the synthesized TMAc was consistent with the expe...

Embodiment 2

[0044] Polymerization was carried out by changing the feed ratio, and the synthesis process was the same as in Example 1 to obtain homogeneous and transparent liquid fluorosilicone raw rubber 6-10. Feed ratio and yield see Figure 13 .

Embodiment 3

[0046] Polymerization was carried out by changing the feed ratio, and the synthesis process was the same as in Example 1 to obtain liquid fluorosilicone raw rubber 15-21. Feed ratio and yield see Figure 14 .

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Abstract

The invention relates to a preparation method of homogenous and transparent liquid fluorosilicone rubber based on an isopropanol extracting method, and belongs to the technical field of macromolecularchemistry. The preparation method comprises the following steps of using 1,3,5-tri-(3,3,3-trifluoro propyl)cyclotrisiloxane (D3F) and octamethylcyclotetrasiloxane (D4) as reactants, using hexamethyldisiloxane ([Me3Si]2O) and 1,3-divinyl-1,1,3,3-tetramethyldisiloxane ([VinMe2Si]2O) as mixed molecule quality regulators, and using alpha,omega-bis(tetramethyl-ammonium) methylsiloxane (TMAc) as an initiator; balancing and polymerizing, so as to obtain the transparent liquid fluorosilicone rubber with adjustable molecular weight; utilizing the isopropanol to extract the produced low-molecule organosiloxane in the polymerizing process, so as to reduce the content of low-molecule siloxane to 1.2-2.7wt%. The preparation method has the advantages that the synthesizing route is simple; the obtainedliquid fluorosilicone rubber is homogenous and transparent, high-property fluorosilicone rubber can be obtained after crosslinking, and the liquid fluorosilicone rubber is a macromolecular raw material with better industrial prospect.

Description

technical field [0001] The invention belongs to the technical field of polymer chemistry and relates to a liquid fluorosilicone raw rubber, in particular to a homogeneous and transparent liquid copolymerized fluorosilicone raw rubber based on an isopropanol extraction method. Background technique [0002] Fluorosilicone rubber is a fluorine-modified silicone polymer with -Si-O- as the main chain and fluorine-containing groups (mainly 3,3,3-trifluoropropyl) in the side chain. It is a new type of rubber material that combines the heat resistance, low temperature resistance, weather resistance, resilience, mold release, and fluororubber oil resistance and solvent resistance of silicone rubber. It can be widely used in automobiles, aircraft, aerospace, petrochemical, Important industrial sectors and fields such as machinery and artificial organs have become indispensable new polymer materials in national defense and national economy. The production of fluorosilicone rubber incl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/24C08G77/34C08G77/06
CPCC08G77/06C08G77/24C08G77/34
Inventor 李彦栗筝李长华李沛霖高欣魏艳凤
Owner 长春物恒新技术有限公司
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