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Crossed-linking composition with organic silicon compound as main ingredient

A technology of organosilicon compounds and crosslinking compositions, applied in other chemical processes, chemical instruments and methods, etc.

Inactive Publication Date: 2008-06-11
WACKER CHEM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, cleavage products or unreacted monomers must additionally be removed

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0162] In the isolation of air humidity and at 120 ° C, 500 grams of octamethylcyclotetrasiloxane, 187.5 grams of methyltrimethoxysilane and 0.35 grams of 40% tetrabutylphosphonium hydroxide solution were stirred for 2 hours, then cooled, The product was neutralized with 3 g of polystyrene-based acidic ion exchanger (commercially available under the trade name "Purolite CT 169DR", manufactured by Purolite, Germany), and filtered with a fine filter.

[0163] 685 grams of silicone crosslinker were produced.

[0164] 29-Si-NMR verified 98% conversion based on silane.

[0165] The analysis result of 29-Si-NMR is:

[0166] 53.9%Me 2 SiO, 25.8% (MeO)Me 2 SiO 0.5 , 9.9% (MeO) MeSiO, 3.6% MeSiO 1.5 , 3.6% (MeO) 2 MeSiO 0.5 , 2.8%Me 2 Si(OMe) 2 , 0.4% MeSi(OMe) 3 .

[0167] Its viscosity is 3.0 mm2 / s and its flash point is 24°C.

[0168] In a planetary mixer, make 330 g of a polydimethylsiloxane mixture with a viscosity of 80,000 mPa·s, wherein the siloxane is made of dimet...

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Abstract

The present invention relates to a composition with main component of organosilicon compounds, controllable modulus and being capable of being crosslinked through condensation reaction, a method for preparing the composition and application of the composition as a sealant, wherein, the composition contains at least an organic siloxane composed of units in formula (I) of RdXeSiO(4-d-e) (Definitions of these groups and indexes are the same as the definitions in the No.1 Claim) as a crosslinking agent, and the conditions are that: sum of d and e is less than or equal to 3, each molecule contains three to fifteen units in formula (I), each molecule contains at least two groups X, and each molecule contains at least one formula (I) unit in which d is equal to two and e is equal to zero.

Description

technical field [0001] The present invention relates to a composition with organosilicon compound as the main component, which has controllable modulus and can be crosslinked by condensation reaction, its production method and its use as a sealant. Background technique [0002] One-component sealants which are storable in the absence of water and vulcanize to elastomers at room temperature on contact with water are known. For example, these products are used extensively in the construction industry. The main components of these mixtures are polymers terminated by silyl groups bearing reactive substituents such as OH groups or hydrolyzable groups such as alkoxy groups and crosslinkers such as alkoxysilanes. [0003] Especially for joint sealants, it is always desirable that the modulus of the sample is low so that the force acting on both sides of the joint is as small as possible, where the modulus is the stress value at 100% elongation. Another desirable property is that ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08K5/5419C08L83/04C08G77/14C08G77/04C09K3/10
CPCC08G77/14C08G77/045C08G77/18C08L83/04C08L83/00C08L2666/44
Inventor 马尔科·普拉瑟
Owner WACKER CHEM GMBH
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