Single-component addition type thermocuring silicone rubber composition

A silicone rubber composition and an addition molding technology are applied in the field of one-component addition-type heat-curing silicone rubber compositions, which can solve the problem that the storage time and the heat-curing reaction time cannot be balanced, the storage period is short, and the colloid surface is prone to wrinkles and Air holes, etc.

Pending Publication Date: 2021-09-10
GUANGDONG HENGDA NEW MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of this application is to provide a one-component addition-type heat-curing silicone rubber composition. The technical solution provided by the invention solves the problem that the existing one-com...

Method used

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  • Single-component addition type thermocuring silicone rubber composition
  • Single-component addition type thermocuring silicone rubber composition
  • Single-component addition type thermocuring silicone rubber composition

Examples

Experimental program
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Embodiment 1

[0102] Both ends is used as component A Viscosity 25 ℃ respectively with dimethyl vinyl-terminated 10000mPa · S is a dimethylpolysiloxane parts 60, specific surface area of ​​200m 2 / G, 40 parts of fumed silica, hexamethyl disilazane 8 parts, 2 parts of water, was added kneaded by a kneader, after uniformly mixed, further mixed at 150 deg.] C under vacuum for 1-3 hours, then added group a sub-component parts 40, 150 vacuum kneading deg.] C for 1 to 2 hours, cooled at room temperature to give a silicone rubber base.

[0103] To 100 parts of a silicone rubber base was added separately with both ends of component A Viscosity 25 ℃ dimethyl vinyl-terminated dimethyl polysiloxane 1000mPa · S 42 parts, both ends of the molecular chain with three vinyl-terminated molar fraction of 0.20% of 6 parts of methyl vinyl gum, having a Si-H group in the side chain methyl hydrogen polysiloxane (Si-H group content of 0.005mol / g) of component B 3.14 parts of component, 0.19 parts of ethynyl-9-fluo...

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Abstract

The invention discloses a single-component addition type thermocuring silicone rubber composition, belonging to the technical field of addition type silicone rubber compositions. The single-component addition type thermocuring silicone rubber composition comprises: a component A, which is an organopolysiloxane polymer having two or more vinyl groups in each molecule and being in a liquid state at 25 DEG C; a component B, which is a hydrogen-containing polysiloxane polymer having two or more hydrosilyl groups in each molecule; a component C, which is a curing reaction catalyst; a component D, which is a curing reaction retarding agent and is one or a mixture of a plurality of substances selected from the group consisting of 3,5-dimethyl-1-hexyn-3-ol, 1-ethynyl-1-cyclohexanol, 2-phenyl-3-butyn-2-ol, 9-ethynyl-9-fluorenol, tetramethyl tetravinyl cyclotetrasiloxane, diallyl maleate, diethyl fumarate and phenylacetylene; and a component E, which is a powdery reinforcing filler. By adopting the above technical scheme provided by the invention, the technical problems that the storage period of existing single-component addition type silicone rubber is short, storage time and thermocuring reaction time cannot be balanced at the same time, and wrinkles and air holes are easy to generate on the surface of the rubber body are solved.

Description

Technical field [0001] The present application relates to the field addition type silicone rubber composition, particularly to a heat-curing one-component addition-type silicone rubber composition. Background technique [0002] Silicone material is silicon - oxygen (Si-O) bond as the main chain structure, the inorganic semi-organic semi-elastic polymer with organic groups on the silicon atom, and therefore has good thermal stability of silicone and low-temperature resistance, and It has good electrical insulating properties, as well as having a good rubber elasticity, and good acid resistance, solvent resistance. Thus, silica is often used as a sealing material is applied to various fields of electrical, electronic parts, automotive parts, equipment parts and the like. [0003] A cured silicone rubber manner divided into a condensation type and addition. Condensation-type RTV silicone rubber, a small molecule byproducts cured, the curing speed is slow, poor strength, large shrink...

Claims

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Application Information

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IPC IPC(8): C08L83/07C08L83/05C08K13/04C08K7/26C08K5/544C08K5/05
CPCC08L83/04C08K2201/006C08L2205/025C08K13/04C08K7/26C08K5/5445C08K5/05
Inventor 林探厅关怀卢秀娴王先胜周为民
Owner GUANGDONG HENGDA NEW MATERIALS TECH
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