Hot-wet resistant and aging resistant dual-component condensation type room temperature curing silicone rubber

A room temperature curing, two-component technology, applied in non-polymer adhesive additives, adhesives, adhesive additives, etc., can solve problems such as performance degradation

Active Publication Date: 2012-04-25
MIANYANG WELLS ELECTRONICS MATERIAIS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Aminopropyltriethoxysilane, aminoethylaminopropyltriethoxysilane and other commonly used aminosilane coupling agents are highly alkaline, which may lead to degradation of silicone rubber and performance degradation under hot and humid conditions.

Method used

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  • Hot-wet resistant and aging resistant dual-component condensation type room temperature curing silicone rubber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Component A: 50g hydroxyl-terminated polydimethylsiloxane with a viscosity of 20000mPa.s, 50g stearic acid-treated calcium carbonate with an average particle size of 0.06 microns, mix well, three-roll milling, add 3g epoxy resin E51 , mixed evenly, vacuum defoaming.

[0031] Component B: 49g of methyl silicone oil with a viscosity of 10000mPa.s, 10g of pigment carbon black, 20g of ethyl orthosilicate, 1g of dibutyltin dilaurate, 20g of aminopropyltriethoxysilane, mix well, vacuum defoaming, sealed package.

[0032] When using, mix component A and component B uniformly according to the weight ratio of 10:1, and defoam to obtain black two-component room temperature curing condensation type silicone rubber 1#. The results are shown in Table 1.

Embodiment 2

[0034] Component A: 55g of hydroxyl-terminated polydimethylsiloxane with a viscosity of 10000mPa.s, 42g of stearic acid-treated calcium carbonate with an average particle size of 0.08 microns, 3g of titanium dioxide, mix well, three-roll milling, add 2g Glycidyl ether propyl trimethoxysilane, mixed evenly, vacuum defoaming.

[0035] B component: 60g viscosity 5000mPa.s methyl silicone oil, 9g hexamethyldisilazane treatment specific surface area 200m 2 / g of fumed silica, 1g of stannous octoate, 10g of aminopropyltrimethoxysilane, and 20g of partially hydrolyzed oligomer of methyltrimethoxysilane, mixed evenly, vacuum defoamed, and sealed in packaging.

[0036] When using, mix A component and B component according to the weight ratio of 10:1, and defoam to obtain white two-component room temperature curing silicone rubber 2#. The results are shown in Table 1.

Embodiment 3

[0038] Component A: 87g hydroxyl-terminated polydimethylsiloxane with a viscosity of 20000mPa.s, 13g hexamethyldisilazane with a specific surface area of ​​200m 2 / g of fumed silica, mix evenly, three-roll milling, add 2g allyl glycidyl ether, mix evenly, and vacuum defoam.

[0039] Component B: 55g of methyl silicone oil with a viscosity of 1000mPa.s, 4g of hexamethyldisilazane treated with a specific surface area of ​​200m 2 / g of fumed silica, 20g of aminoethylaminopropyl triethoxysilane, 20g of propyl orthosilicate, 1g of dibutyltin diacetylacetonate, mixed evenly, vacuum defoamed, sealed and packaged.

[0040] When using, mix component A and component B uniformly according to the weight ratio of 10:1, and defoam to obtain translucent two-component room temperature curing condensation type silicone rubber 3#. The results are shown in Table 1.

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Abstract

The present invention discloses a hot-wet resistant and aging resistant dual-component condensation type room temperature curing silicone rubber. According to the rubber, a epoxy group-containing compound and an amino silane coupling agent compound are respectively added to a component A and a component B of the dual-component condensation type room temperature curing silicone rubber; treatments of mixing and curing are performed to form a elastomer, wherein the elastomer provides excellent adhesion for the substrate, and retains good mechanical property and good adhesion property under the hot-wet environment. According to the present invention, during the rubber applying process, the component A and the component B of the dual-component condensation type room temperature curing siliconerubber are uniformly mixed according to a weight ratio or a volume ratio automatically calculated by equipment, then bubbles are removed, and the curing treatment is performed for a plurality of hours or days at the room temperature to form the elastomer, wherein the elastomer has good mechanical property and good adhesion property. Compared to the silicone rubber without addition of the epoxy group-containing compound, the silicone rubber of the present invention has significant hot-wet resistance.

Description

technical field [0001] The invention is a preparation method of a two-component condensation type room temperature curing silicone rubber resistant to damp heat aging. Background technique [0002] Two-component condensation type room temperature curing silicone rubber does not release heat when curing, has small shrinkage rate, low internal stress, and can be vulcanized deeply. After curing, it has the characteristics of heat resistance, cold resistance, dielectric property, ozone resistance and environmental aging resistance. Ideal for many specific industrial assemblies. In the field, there have been a large number of two-component room temperature curing silicone rubbers that are cross-linked into elastomers through condensation reactions. The main components of these silicone rubbers are: hydroxyl-terminated polydimethylsiloxane, methyl silicone oil, white carbon black, silicon micropowder, calcium carbonate and other fillers, alkoxysilane crosslinking agent, organotin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J183/06C09J183/04C09J11/06C09J11/04
Inventor 刘良军芦成陆南平赵元刚
Owner MIANYANG WELLS ELECTRONICS MATERIAIS
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