Fluorosilicone rubber continuous-polymerization method

A technology of fluorosilicone rubber and polymerization method, which is applied in the field of continuous polymerization of fluorosilicone rubber, can solve the problems of large pressure loss and does not involve continuous polymerization of fluorosilicone rubber, so as to avoid large pressure loss, high production efficiency, and equipment structure simple effect

Active Publication Date: 2014-12-17
福建永泓高新材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The patent number is CN1154974A, and the Chinese invention patent titled "Silicone rubber raw rubber continuous polymerization device and process" uses a static mixer to realize the continuous polymerization of ordinary silicone rubber, but it does not involve the continuous polymerization of fluorosilicone rubber.
In addition, it only uses a SV-type static mixer. Although it uses front and rear mixers with different diameters to solve the problem of increasing viscosity of the reaction medium, the content of non-polymerized monomers in fluorosilicone rubber is less than 5% (ordinary silicone rubber) Non-polymerized monomers in rubber account for at least 12%), and the trifluoropropyl group makes the molecular chain relatively rigid, so the viscosity in the later stage of polymerization will be greater than 200,000 Pa·S, which is much higher than the viscosity of ordinary silicone rubber in the later stage of polymerization. SV Type static mixer, the pressure loss will be very large

Method used

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  • Fluorosilicone rubber continuous-polymerization method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Such as figure 1 As shown, use a dehydration kettle A1 and a dehydration kettle B1 with a volume of 500 liters, a stirring feed port, a discharge port, an evacuation port and a sight glass, and first add trifluoropropylmethylcyclotrisiloxane to the dehydration kettle A1 300kg alkane, stirring, then add 1kg lithium silanolate catalyst, 0.1kg small molecular weight hydroxy fluorosilicone oil (viscosity is 60mPa S) and 1.5kg tetravinyltetramethylcyclotetrasiloxane in dehydration kettle A1, heat Raise the temperature to 60°C and dehydrate for 3 hours under the pressure of -0.95MPa. After the dehydration is completed, the material is transferred to the small-diameter JTSV static mixer 4 through the metering pump 3, and the conveying speed is controlled at 50kg / hour. When half of the material in the dehydration kettle A1 is transferred to the small-diameter JTSV static mixer 4 through the metering pump 3, add 300 kg of trifluoropropylmethylcyclotrisiloxane to the dehydration...

Embodiment 2

[0035] Repeat the steps described in embodiment 1, adjust the conveying speed of metering pump 3 and control at 100kg / hour, adjust the material residence time of JTSV type static mixer 4 at 0.5 hour, adjust the material residence time of JTX2 type static mixer 5 at 1 Hour. Fluorosilicone rubber with a molecular weight of 500,000-700,000 and a volatile content of 2-4% is obtained.

Embodiment 3

[0037] Repeat the steps described in Example 1, adjust the conveying speed of metering pump 3 to control at 34kg / hour, adjust the material residence time of JTSV type static mixer 4 at 1.5 hours, adjust the material residence time of JTX2 type static mixer 5 at 3 Hour. Fluorosilicone rubber with a molecular weight of 850,000 to 950,000 and a volatile content of 1.5 to 2.5% are obtained.

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Abstract

The invention relates to a fluorosilicone rubber continuous-polymerization method. The fluorosilicone rubber continuous-polymerization method comprises the following steps of carrying out mixing dehydration of a lithium siliconate catalyst, a molecular weight conditioning agent, trifluoropropylmethylcyclotrisiloxane and a vinyl ring according to a certain stoichiometric ratio to obtain a material, transferring the material to a JTSV-type static mixer having a small diameter and a JTX2-type static mixer, and carrying out directional plunger movement of the material in the JTSV-type static mixer and the JTX2-type static mixer with control of inner temperatures and duration time of the static mixers so that a prepared fluorosilicone rubber has specified molecular weight and comprises specified volatile components. The fluorosilicone rubber continuous-polymerization method utilizes the static mixers to realize continuous-polymerization of a fluorosilicone rubber, has simple processes, a simple equipment structure, a high production yield, and a small pressure loss. The fluorosilicone rubber obtained by the fluorosilicone rubber continuous-polymerization method has molecular weight more than 500000 and volatile component content less than 4wt%.

Description

technical field [0001] The invention relates to a polymer polymerization method, in particular to a continuous polymerization method of fluorosilicone rubber. Background technique [0002] Fluorosilicone rubber is a modified silicone rubber. A trifluoropropyl group replaces a side methyl group of ordinary silicone rubber. It combines the advantages of fluororubber and silicone rubber. It has the excellent low temperature and high temperature resistance of ordinary silicone rubber. Excellent weather resistance, also has the excellent resistance to non-polar media performance of fluororubber. So far, fluorosilicone rubber is the only industrialized synthetic rubber that is resistant to low temperatures of -68°C, high temperatures above 200°C, and non-polar media. [0003] At present, the polymerization of fluorosilicone rubber is divided into continuous polymerization and interstitial polymerization. Interstitial polymerization is to complete all processes such as dehydration...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G77/24C08G77/06
Inventor 徐旭东罗建文
Owner 福建永泓高新材料有限公司
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