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Damping silicon rubber with relatively small temperature effect and preparation method thereof

A temperature effect, silicone rubber technology, applied in the field of damping silicone rubber and its preparation, can solve the problems of material damping performance having a great influence, the damping effect of the damping material is not good, and cannot be used as an elastic body, etc., and achieves stable damping performance and damping. Good effect and heat resistance improvement effect

Active Publication Date: 2015-07-08
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adding hollow glass microspheres and mica fillers to the mixing formula can increase the damping factor of the material to 1.5, but it will drop suddenly as the temperature increases or decreases. At -100 ° C, the damping factor drops below 0.1, and the The preparation process of the invention is complicated and takes a long time
[0004] Chinese patent CN1746224A discloses a method for preparing damping silicone rubber containing methylphenyl vinyl, which is characterized in that the raw rubber contains methylphenylsiloxane chains, dimethylsiloxane chains and methyl Vinyl siloxane chain link is reinforced by adding silazane-treated white carbon black and iron oxide for dyeing and improving its heat resistance. The damping silicone rubber disclosed in this patent can be used at a temperature of -50°C-100°C The damping factor tanδ≥0.2 in the range, and the temperature below -50℃ has not been studied
Chinese patent CN101962480A discloses a methyl phenyl silicone rubber with low phenyl content. The rubber is mechanically blended with low phenyl silicone rubber, vinyl silicone oil, white carbon black, etc. The material has poor mechanical properties. In the temperature range of -50°C-150°C, the damping coefficient is low, tanδ max Not more than 0.4, especially below -20°C, tanδ<0.1, indicating that the damping effect of the damping material is not good at low temperatures
[0005] U.S. Patent No. 5,332,795 discloses the preparation of a silicone gel containing phenyl groups and trifluoropropyl groups. The material has good damping characteristics and low temperature resistance. The gel of this patent is made of small molecular silicone oil through Cross-linking, the formation of low cross-linking density, low strength, large deformation, can only be used as a filler material, can not be used as an elastomer, the damping performance of the material is greatly affected by the frequency

Method used

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  • Damping silicon rubber with relatively small temperature effect and preparation method thereof
  • Damping silicon rubber with relatively small temperature effect and preparation method thereof
  • Damping silicon rubber with relatively small temperature effect and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1: Add 18.6g of tetramethyldivinyldisiloxane and 2g of sodium hydroxide powder into a pressure-resistant reactor, add 15ml of anhydrous toluene and 2g of polypropylene oxide with a molecular weight of 1000, seal the reactor, and raise the temperature React at 100°C for 1 hour, cool down to -5°C, press in 1.15g of sodium wire, gradually raise the temperature to 80°C, continue to react for 1hr, then add 40.8g of methylphenylcyclosiloxane and 45.9g of hexaethylcyclotri The mixture of siloxanes was reacted at 100°C for 2 hours, continued to heat up to 120°C to evaporate the toluene and reacted for 1 hour, and cooled to room temperature to obtain a sodium hydroxide silicon alkoxide initiator.

Embodiment 2

[0038] Embodiment 2: 9.3g of tetramethyldivinyldisiloxane and 1.425g of calcium hydroxide powder are added to a pressure-resistant reactor, 15ml of anhydrous toluene and 2g of polypropylene oxide with a molecular weight of 1000 are added, and the reactor is closed. Raise the temperature to 150°C for 1 hour, cool to -5°C, press in 1g of calcium wire, gradually raise the temperature to 80°C, continue the reaction for 1hr, then add 20.4g of methylphenylcyclosiloxane and 23g of hexaethylcyclotrisilane The mixture of oxanes was reacted at 100°C for 2hrs, continued to heat up to 120°C to evaporate toluene and reacted for 1hr, and then cooled down to room temperature to obtain calcium hydroxide silicon alkoxide initiator.

Embodiment 3

[0039] Example 3: As a comparison, a conventional method was used to prepare sodium hydroxide silicon alkoxide, 4g of sodium hydroxide powder was added to the reactor, 10.2g of methylphenylcyclosiloxane and 11.95g of hexaethylcyclotrisiloxane were added The mixture was heated up to 100°C for 1 hr, then added a mixture of 30.6 g of methylphenylcyclosiloxane and 35.85 g of hexaethylcyclotrisiloxane, reacted at 100°C for 2 hr, and continued to heat up to 120°C for 1 hr. Cool down to room temperature to obtain sodium hydroxide silicon alkoxide initiator.

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Abstract

The invention relates to damping silicon rubber with a relatively small temperature effect and a preparation method thereof. The crude rubber of the damping silicon rubber is characterized in that a main chain of the crude rubber of the silicon rubber consists of methyl phenyl silicone chain elements, diethyl silicone chain elements, dimethyl silicone chain elements and methyl ethylene silicone chain elements with different content; the molecular weight of the crude rubber is more than 400 thousands; the crude rubber is prepared by copolymerizing methyl phenyl cyclosiloxane, diethyl cyclosiloxane, dimethyl cyclosiloxane and methyl ethylene cyclosiloxane in the presence of initiators of polypropylene oxide and the like. The crude rubber with the structure has good damping property in a relatively wide temperature range after being vulcanized, the dynamic loss factor and the modulus hardly change along with temperature changes, and the damping silicon rubber belongs to the field of organic silicon high polymer.

Description

technical field [0001] The invention belongs to the field of silicone rubber preparation, in particular to a damping silicone rubber with small temperature effect and a preparation method thereof. Background technique [0002] Silicone rubber is a rubber material with -Si-O- chain link as the main chain, which has excellent high and low temperature resistance, and stable mechanical properties in a wide temperature range and wide frequency. Silicone rubber can be widely used as a damping material in aerospace and other fields, making up for the shortcomings of conventional damping and shock-absorbing materials with a narrow temperature range. However, the damping factor of ordinary silicone rubber is small (generally 0.05-0.1), or the damping factor and dynamic modulus vary greatly with temperature, so it is difficult to meet the requirements of high damping stability applications. [0003] Chinese patent CN102181056A discloses a method for preparing damping silicone rubber,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08K3/36C08K5/14B29C35/02C08G77/20
Inventor 周传健张颖
Owner SHANDONG UNIV
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