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Organic silicon damping additive and preparation method thereof

An organosilicon and additive technology, applied in the field of organosilicon damping materials, can solve the problems of low chemical activity of EPDM rubber, decline in damping performance, decline in mechanical properties, etc., to solve the migration problem, reduce the influence of mechanics, reduce internal The effect of high frictional resistance

Active Publication Date: 2016-12-07
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN101962480A discloses a method for preparing methylphenyl silicone rubber with low phenyl content. The rubber is mechanically mixed with low phenyl silicone rubber, vinyl silicone oil, white carbon black, etc. The mechanical properties of the material Poor, the damping coefficient is low in the operating temperature range -50°C-150°C, tanδ max No more than 0.4, especially above -20°C, tanδ<0.1
Chinese patent CN201210233193.6 prepared a silicone rubber / EPDM blend rubber. Due to the low chemical activity of EPDM rubber and slow vulcanization speed, diphenylmethane bismaleimide was used to improve the composition of EPDM rubber. The vulcanization speed of the two kinds of rubber can be suppressed, so that the vulcanization speed of the two rubbers tends to be close, and co-vulcanization can be realized. However, due to the compatibility problem of the two substances themselves, the blending will reduce the mechanical properties, and the long-term Easy to form phase separation during storage or use
Although the interpenetrating network polymer has excellent damping properties, it is difficult to form
As an additive, hindered phenol can effectively increase the damping performance of polar polymers, but because hindered phenol molecules are small and easy to precipitate, the damping performance drops rapidly at high temperature

Method used

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  • Organic silicon damping additive and preparation method thereof
  • Organic silicon damping additive and preparation method thereof
  • Organic silicon damping additive and preparation method thereof

Examples

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Effect test

Embodiment 1

[0035] Example 1: Preparation of aminopropylphenyl silicone oil (i.e. the modified silicone oil in the summary of the invention): 13.6g methylphenylcyclosiloxane, 0.88g aminopropylmethyl dimethyl Oxysilane, 0.09g Tetramethyltetravinylcyclotetrasiloxane (D 4 Vi ), 0.1gKOH powder, 30gH 2 O, 20mL DMSO and 0.90g decamethyltetrasiloxane (MD 2 M), heat up to 90-110°C in a nitrogen atmosphere, stir for 3 hours, vacuumize to remove the water and ethanol generated in the system, keep the vacuum and heating state for 30 minutes, remove the vacuum, keep warm and continue to balance for 5-6 hours, and then cool down the system to 50°C, then add metered ratio of glacial acetic acid to neutralize KOH. After neutralization for 5 minutes, the temperature was raised to 200°C, and the small molecules in the system were removed under vacuum conditions to obtain a compound with a molecular weight of 5000, a molar content of aminopropylsiloxane chains of 5%, and a methylphenyl chain of 94%. , ...

Embodiment 2

[0037] Example 2: 10 g of aminopropylphenyl with a molecular weight of 5000, aminopropylsiloxane chains with a molar content of 5%, methylphenyl chains with 94%, and vinyl chains with a content of 1% Silicone oil was dissolved in 100g of xylene, under nitrogen atmosphere, the temperature was raised to 150°C, 0.55g of phthalic anhydride was added, and the reflux was maintained, and the water produced in the reaction was continuously removed with a water separator until the reaction was complete. Lower the temperature, fully shake with hot sodium bicarbonate solution, wash off the unreacted anhydride, filter, dry, and remove the solvent in a vacuum to obtain 5% phthalimide imide propyl siloxane chain unit damping additives.

Embodiment 3

[0038] Embodiment 3: Referring to Example 2. The silicone oil is replaced with a molecular weight of 50,000, an aminopropylsiloxane chain unit content of 10%, a methylphenyl chain unit of 89%, and a vinyl chain unit content of 1%. Add 1.32 g of phthalic anhydride to aminopropylphenyl silicone oil, and keep other conditions constant, to prepare a damping additive with a phthalimide propylsiloxane chain segment content of 10%.

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Abstract

The invention discloses an organic silicon damping additive. The molecular structure formula of the organic silicon damping additive is as shown in the description, wherein R is an aromatic group; w / (w+x+y+z)*100%=1%-40%;z / (w+x+y+z)*100%=0.1%-5%; and (x+y) / (w+x+y+z)*100%=55%-98.9%. According to the organic silicon damping additive disclosed by the invention, the volume of a polysiloxane side group of an aromatic imide side group contained in a side chain is larger than that of phenyl, internal friction resistance between chain segments is large, and the damping effect can be improved. In addition, the molecular weight of the organic silicon damping additive and the content of the imide side group are adjusted, so that the damping temperature range is widened. In addition, the organic silicon damping additive disclosed by the invention also contains vinyl chain links and can realize covulcanization with methyl phenyl silicone rubber, so that not only is the migration problem of a low molecular weight damping additive solved, but also the influence on the mechanics of silicone rubber is reduced.

Description

technical field [0001] The invention relates to a silicone polymer containing aromatic imide side groups and as a damping additive to improve the damping performance of silicone rubber, belonging to the field of silicone damping materials. Background technique [0002] Silicone rubber is a viscoelastic damping material, which has advantages such as high and low temperature resistance, and radiation resistance. It can be used in special environments such as aerospace, but the damping performance is generally low and the effective temperature range is narrow. In order to obtain high damping silicone materials, researchers mainly improve from the perspective of polymer matrix or adding damping agents. Chinese patent CN101962480A discloses a method for preparing methylphenyl silicone rubber with low phenyl content. The rubber is mechanically mixed with low phenyl silicone rubber, vinyl silicone oil, white carbon black, etc. The mechanical properties of the material Poor, the da...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/388C08L83/04C08L83/08C08K3/36
CPCC08G77/388C08L83/04C08L83/08C08K3/36
Inventor 周传健张颖张晨赵士贵
Owner SHANDONG UNIV
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