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Synthesis and use of alkylalkoxy acyloxysilanes and blends thereof for use as a crosslinking agent in moisture curing rtv's

A technology of moisture curing and room temperature vulcanization, which is applied in the field of preparing the crosslinking agent or chain extender and novel RTV sealant composition, and can solve the problems of concentration change and the like

Inactive Publication Date: 2005-04-20
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While the latter qualities can be obtained in part by using mixtures of different crosslinkers within a given sealant composition, this will result in variations in their concentration throughout the composition

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Example 1 illustrates the preparation of (1-butoxy)methyldiacetoxysilane. The crosslinker is synthesized by mixing the following ingredients under anhydrous conditions.

[0052] 297.2g 1-butanol

[0053] 882.6g Triacetoxysilane

[0054] The reaction mixture was stirred for 15 minutes, then the acetic acid was evaporated under reduced pressure.

Embodiment 2

[0056] Example 2 illustrates the preparation of a mixture of (1-butoxy)methyldiacetoxysilane and methyltriacetoxysilane. The crosslinker was synthesized by mixing the following ingredients under anhydrous conditions. The catalyst mixture is liquid at 20°C.

[0057] 103.4g 1-butanol

[0058] 882.6g methyltriacetoxysilane

[0059] The reaction mixture was stirred for 15 minutes, then the acetic acid was evaporated under reduced pressure.

Embodiment 3

[0061] Example 3 illustrates the preparation of a mixture of methyltriacetoxysilane and butoxymethyldiacetoxysilane. The crosslinker was synthesized by mixing the following ingredients under anhydrous conditions. The catalyst mixture is liquid at 20°C.

[0062] 21.0g n-butanol

[0063] 220.1g Triacetoxysilane

[0064] The reaction mixture was stirred for 15 minutes, then the acetic acid was evaporated under reduced pressure. product of 1 H-NMR and 29 Si NMR with mixtures of methyltriacetoxysilane, (2-propoxy)methyldiacetoxysilane, and bis(2-propoxy)methylacetoxysilane 1 H-NMR and 29 SiNMR agrees.

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Abstract

A one part moisture curable room temperature vulcanizable silicone composition comprising an alkylalkoxyacyloxysilane selected from the group consisting of R1SiR2aR33-a and R4R5bR63-bSi-O-SiR7R8cR93-c and mixtures thereof; where R1, R4 and R7 are independently selected from the group of alkyl radicals having, the formula (CH2)nX, where n has 1 to 10 carbon atoms, and X is selected from the group consisting of hydrogen, amino, epoxy, cyano, thiocyano, allyl, and vinyl; R2R5 and R8 are independently selected from the group of acyloxy radicals having the formula OC(O)(CH2)mH, where m has 1 to 8 carbon atoms; R3, R6 and R9 are independently selected from the group of alkoxy radicals or mixture of alkoxy radicals of 1 to 10 carbon atoms wherein the subscripts a, b and c are subject to the following limitations: 0<a<3; 0<b<3; and 0<c<3 wherein said alkylalkoxyacyloxysilane is a liquid at a temperature above 0° C.

Description

field of invention [0001] The present invention relates to novel polyorganosiloxane crosslinkers or chain extenders for use in room temperature vulcanizable (RTV) sealants, and to novel RTV sealant compositions comprising them. The present invention also relates to novel methods of preparing said crosslinkers or chain extenders. Background of the invention [0002] Several of the previously described RTV sealant types are discussed below: [0003] Siloxanol-silicate type [0004] The main polymer component in the earliest RTV silicone systems was a linear or moderately branched silicone with silanol end groups. Alkyl silicates or alkyl polysilicates (generally tetraethylorthosilicate or partial hydrolysis and condensation products derived therefrom) are often used as crosslinking agents. Commonly used catalysts are tin compounds such as stannous octoate, dibutyltin dilaurate. Fillers, coloring pigments and other auxiliary materials can also be used. Typically the system...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/10C08G77/06C08G77/08C08K5/5415C08K5/5419C08K5/57C08L83/04C08L83/06
CPCC08G77/16C08G77/18C08K5/5419C08L83/04Y10S528/901C08L2666/44
Inventor 乔纳森·R·萨金特
Owner GENERAL ELECTRIC CO
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