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Copolymerized high-performance damping silicon rubber and preparation method thereof

A high-performance, silicone rubber technology, applied in the field of functional polymer materials, can solve the problems of poor high and low temperature resistance, increased modulus change, unfavorable damping performance, etc., to achieve good mechanical properties and durability, easy processing, The effect of superior vibration damping performance

Active Publication Date: 2011-09-14
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the structure of this copolymer is very different from that of silicone rubber, which makes the excellent high and low temperature resistance of silicone rubber worse, and increases the modulus of the rubber material in the operating temperature range, which is not conducive to the wide temperature range. Stable damping performance is obtained in the range of

Method used

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  • Copolymerized high-performance damping silicon rubber and preparation method thereof
  • Copolymerized high-performance damping silicon rubber and preparation method thereof
  • Copolymerized high-performance damping silicon rubber and preparation method thereof

Examples

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Embodiment

[0057] The preparation method of copolymerized high-performance damping silicone rubber comprises the following steps:

[0058] 1. Purification of methylphenyldichlorosilane

[0059] In parts by weight, add 100 parts of industrial-grade methylphenyldichlorosilane into a reactor with a stirrer and a thermometer. Prepare the mixed solution by weight ratio, drop it into the above reactor under stirring, keep stirring for 1-2 hours after the mixed solution is added dropwise, and then distill and purify at a temperature of 190-205°C to obtain a methylphenyldichlorosilane liquid with a purity of Increased from 35wt% to 93.6-96.7wt%;

[0060] 2. Preparation of mixed rings containing methylphenylsiloxane

[0061] Mix the above-mentioned purified methylphenyldichlorosilane with a 40wt% toluene aqueous solution at a volume ratio of 1 to 3:1 to form a solution, and add it dropwise to a 10 to 20wt% HCl aqueous solution under stirring for hydrolysis. The temperature is 10-30°C. After a...

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Abstract

The invention discloses copolymerized high-performance damping silicon rubber and a preparation method thereof. The preparation method is characterized by comprising the following steps of: adding 100 parts by mole of octamethylcy-clotetrasiloxane, 0.001-1 part by mole of tetram-ethy1tetravinylcyclotetrasiloxane, 1-50 parts by mole of octaphenyl cyclotetrasiloxane and 1-500 parts by mole of hybrid ring containing methylphenyl siloxane chain links into a reactor; dehydrating by forming nitrogen bubbles at the temperature of between 55 DEG C and 65 DEG C under the protection of nitrogen gas for 1-3 hours; adding 0.01-5 percent by weight of catalyst; continually drying nitrogen bubbles; adding 0.00001-1 part by millimole of end-capping reagent when the viscosity rises; undergoing a balanced reaction at the temperature of between 90 DEG C and 110 DEG C for 7-8 hours; raising the temperature to 145-165 DEG C after the reaction; preserving heat for 1-2 hours; decomposing and breaking the catalyst; raising the temperature to 180-200 DEG C finally; separating low molecular substances out at reduced pressure under the vacuum degree of 6-12 Mpa until distillate is eliminated fully; cooling to room temperature and discharging; and stopping reducing pressure to obtain polymethyl phenyl ethylene siloxane. Phenyl siloxane rubber further prepared from the copolymer has superior damping capacity and mechanical property.

Description

technical field [0001] The invention relates to a copolymerized high-performance damping silicone rubber and a preparation method thereof, belonging to the field of functional polymer materials. Background technique [0002] Silicone rubber is a special rubber material with certain mechanical properties in a wide temperature range or wide frequency, superior heat resistance, cold resistance, weather resistance, ozone resistance, and radiation resistance. It is widely used in aerospace, precision instruments, and mechanical equipment. and national security and other cutting-edge technology fields. Compared with other materials such as polyurethane, polyacrylate rubber and butyl rubber, the molecular chain structure of ordinary methyl vinyl silicone rubber is symmetrical, and although there are many side methyl groups, it is small in size and small in steric hindrance, resulting in its damping loss factor tanδ is very small (0.05-0.1), in order to improve the damping performa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/20C08G77/06
Inventor 黄光速郑静叶林铭谢志坚
Owner SICHUAN UNIV
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