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Room-temperature-curable polyorganosiloxane composition

A polyorganosiloxane, room-temperature curing technology, which is applied in the field of polyorganosiloxane compositions, can solve the problems of reduced hardness of the cured product, and achieve the effects of good curability, excellent hydrolysis resistance, and excellent adhesion

Inactive Publication Date: 2015-07-15
MOMENTIVE PERFORMANCE MATERIALS JAPAN LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the composition of Patent Document 2, there is also a problem that the hardness of the cured product is greatly reduced in a high-temperature, high-humidity atmosphere.

Method used

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  • Room-temperature-curable polyorganosiloxane composition
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  • Room-temperature-curable polyorganosiloxane composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0112] First, prepare the M unit and Q as follows OH Unit composition polyorganosiloxane (hereinafter expressed as MQ OH resin).

[0113] [(c)MQ OH Resin Preparation]

[0114] 100 parts of trimethylchlorosilane and 200 parts of sodium silicate were hydrolyzed and condensed in a mixed solvent of water, IPA (isopropyl alcohol) and xylene. After stirring at a temperature below 80°C for 2 hours, the liquid is separated into water phase and oil phase, and MQ is obtained as the oil phase OH Resin solution in xylene. The resulting MQ OH Resin M unit and Q OH The molar ratio of the unit (M / Q OH ) was 0.9, the mass average molecular weight (Mw) was 3000, and the hydroxyl group content was 0.2% by mass.

[0115] To (a1) 100.0 parts of polydimethylsiloxane (viscosity 10Pa·s, hydroxyl content 0.036mmol / g) which is terminated by hydroxyl groups at both ends of the molecular chain (d) is mixed with trimethylsilyl groups at both ends of the molecular chain 10.0 parts of end-blocked ...

Embodiment 2~13、 comparative example 1~7

[0118] Each component shown as the main ingredient composition in Tables 1 to 3 was blended according to the composition shown in the same table, mixed in the same manner as in Example 1, and the total number of parts of the main ingredient composition shown in the same table was obtained. In addition, each component shown as a curing agent composition in Tables 1 to 3 was blended according to the composition shown in the same table, and mixed in the same manner as in Example 1 to obtain a curing agent combination of the total number of parts shown in the same table. thing. Then, the main component composition and the curing agent composition thus obtained were uniformly mixed to obtain a polyorganosiloxane composition curable at room temperature.

[0119] Tables 1 to 3 collectively show the total amount of alkoxy groups bonded to silicon atoms in the (e) component and (f) component in Examples 1 to 13 and Comparative Examples 1 to 7, and (a) component and (c) The molar ratio...

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Abstract

Provided is a room-temperature-curable polyorganosiloxane composition which minimises the deterioration of hardness of a cured product in high-temperature and high-humidity conditions, and which has excellent adhesiveness to a variety of base materials. The composition is a two-component room-temperature-curable polyorganosiloxane composition comprising a main agent composition (A), and a curing agent composition (B). The main agent composition (A) contains, at a predetermined ratio, polyorganosiloxane that has a resin structure represented by (c) average unit formula: (R1 3SiO1 / 2)p[Si(OH)xO(4-x) / 2]q. The curing agent composition (B) contains: (e) a trifunctional or tetrafunctional silane compound, or a partial hydrolysis condensate thereof; and (f) an amino group-containing silicon compound.

Description

technical field [0001] The present invention relates to a condensation reaction type polyorganosiloxane composition that cures at room temperature to form a rubbery elastomer. Background technique [0002] It is widely used in bonding, sealing materials, potting materials, FIPG (Formed In Place Gasket) sealing materials, etc. A condensation reaction type silicone rubber composition that cures at room temperature to form a rubber-like elastomer when exposed to moisture in the air. [0003] However, the conventional condensation reaction type silicone rubber composition has the problem that the cured product, that is, the rubber, is hydrolyzed in a high-temperature and high-humidity atmosphere, resulting in a significant decrease in physical properties such as hardness. [0004] As a non-solvent type room temperature curable silicone composition, it is proposed to contain the formula R 3 SiO 1 / 2 Represented monofunctional siloxy unit (M unit) and formula SiO 4 / 2 A two-comp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/06C08K3/00C08K5/5415C08K5/544
CPCC08K9/04C08K2003/265C08K3/00C08L83/06C08K5/544C08K5/5415C08G77/16C08L83/04C08K5/5419C08K5/57C08L83/00
Inventor P.库马饭田勋
Owner MOMENTIVE PERFORMANCE MATERIALS JAPAN LLC
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