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Room-temperature-curable polyorganosiloxane composition

A technology of polyorganosiloxane and room temperature curing, which is applied in the field of room temperature curable polyorganosiloxane compositions, and can solve the problems of insufficient matting effect and adverse effects on the physical properties of cured products, etc.

Active Publication Date: 2010-11-24
MOMENTIVE PERFORMANCE MATERIALS JAPAN LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in such a conventional method, there is a problem that the matting effect is insufficient and the physical properties of the cured product may be adversely affected.

Method used

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  • Room-temperature-curable polyorganosiloxane composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 100 parts of polydimethylsiloxane with a viscosity of 20,000 mPa·s at both ends of the molecular chain terminated by methyldimethoxysiloxy groups, untreated heavy calcium carbonate (manufactured by MARUOCALCIUM Co., Ltd. / ス一 パ-SS) 200 parts, 100 parts of light calcium carbonate (manufactured by Shiraishi Industry Co., Ltd. / Shiraishi TDD) through resin acid surface treatment, 2 parts of carbon black, and the two ends of the molecular chain with a viscosity of 100 mPa·s are treated with trimethylformaldehyde After 33 parts of siloxy-terminated polydimethylsiloxane are evenly mixed, mix 5 parts of methyltrimethoxysilane, 5 parts of diisopropoxybis(ethyl acetoacetate)titanium, and 1 part of isocyanuric acid, 1 part of 3,5-tris[3-(trimethoxysilyl)propyl]ester was used to prepare a one-component room temperature curable polyorganosiloxane composition.

[0031]On the Teflon (registered trademark) plate to which the obtained composition does not stick, place a mold having a thick...

Embodiment 2

[0034] Except that in embodiment 1, the untreated heavy calcium carbonate is changed into 270 parts, and the light calcium carbonate treated with resin acid surface is changed into 30 parts, and in the same manner as in embodiment 1, a one-component type room temperature curing method is prepared. Polyorganosiloxane composition.

Embodiment 3

[0036] Except that in embodiment 1, the untreated heavy calcium carbonate is changed into 290 parts, and the light calcium carbonate treated with resin acid surface is changed into 10 parts, and in the same manner as in embodiment 1, a one-component type room temperature curing method is prepared. Polyorganosiloxane composition.

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Abstract

A room-temperature-curable polyorganosiloxane composition which can become a silicone rubber having a matte surface and does not decrease in physical properties. Specifically, the room-temperature-curable polyorganosiloxane composition comprises: (A) 100 parts by weight of a substantially linear polyorganosiloxane which has a viscosity at 25 DEG C of 20-1,000,000 cSt and in which the molecular chain ends have been blocked with a silanol group or a silicon-bonded hydrolyzable group; (B) 0.1-15 parts by weight of an organosilicon compound having three or more silicon-bonded hydrolyzable groups per molecule; (C) 0-15 parts by weight of a condensation catalyst; (D) 100-400 parts by weight of untreated heavy calcium carbonate or heavy calcium carbonate whose surface has been treated with a resin acid; and (E) 1-200 parts by weight of untreated lightweight calcium carbonate or lightweight calcium carbonate whose surface has been treated with a resin acid (provided that at least one of the ingredients (D) and (E) must have been treated with a resin acid and that the proportion of the ingredient (D) is 50-99.9 wt.% of the sum of the ingredients (D) and (E)).

Description

technical field [0001] The present invention relates to room temperature curable polyorganosiloxane compositions capable of forming a matte surface silicone rubber after room temperature curing. Background technique [0002] Currently, various types of room temperature-curable polyorganosiloxane compositions are known as room temperature-curable polyorganosiloxane compositions that cure at room temperature to form rubber-like elastomers upon contact with moisture in the air, and are used as building exterior sealants and the like. [0003] After the conventional silicone sealing material is cured, since the surface is glossy, sunlight is reflected and nearby people may be dazzled, or the appearance may become unsuitable for the environment. [0004] Therefore, a room temperature curable polyorganosiloxane composition capable of forming a silicone rubber having a matte surface after curing has been expected. [0005] In order to provide silicone rubber with such a matte surf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/06C08K3/26C08K5/5415C08K9/04
CPCC08K5/0091C08K3/26C08G77/18C08K9/04C08L83/06C08G77/16C08K5/5419C08L83/04C08K2003/265
Inventor 大场敏男
Owner MOMENTIVE PERFORMANCE MATERIALS JAPAN LLC
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