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Crosslinkable compounds based on organyloxy group-containing organopolysiloxanes

A technology of organosilicon compounds and polysiloxanes, applied in the direction of coatings, etc., can solve the problems of embrittlement, brittleness, and undesired solvents of cured products.

Active Publication Date: 2020-09-04
WACKER CHEM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, solvents are undesirable due to their flammability or as VOCs
Low viscosity polymers often result in brittle, brittle compositions or must be recompensated with rheologically active reinforcing fillers
Reactive diluents such as functionalized alkoxysilanes, for example, would be a compromise, however, these usually affect the cure very significantly or also cause embrittlement of the cured product

Method used

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  • Crosslinkable compounds based on organyloxy group-containing organopolysiloxanes
  • Crosslinkable compounds based on organyloxy group-containing organopolysiloxanes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0208] 500 g of polydimethylsiloxane having a dimethoxyvinylsilyl terminal group and a viscosity of 8 000 mPa·s, 3.0 g of trimethoxymethylsilane composed of 25% by weight and A mixture of octylphosphonic acid consisting of 75% octylphosphonic acid, 20 g of vinyltriethoxysilane and 15 g of N-aminoethylaminopropyltrimethoxysilane was mixed in a laboratory planetary mixer at about 300 rpm and A pressure of 200-300 hPa is homogenized for a duration of 3 minutes. Then, 347g of ground, uncoated marble powder with an average particle size of 2μm and 10g of marble powder with a specific surface area of ​​150m 2 / g of hydrophilic fumed silica was mixed slowly at a pressure of 900-1100 hPa and dispersed at 800 rpm and a pressure of 200-300 hPa for 8 minutes. Activation of the thus obtained available The mixture was flowed for 3 minutes with stirring to remove air bubbles.

[0209] A portion of the composition thus produced was dispensed to be kept in the sleeve and stored at 23° C. a...

Embodiment 2

[0212] The procedure described in Example 1 was repeated, except that 100 g of isooctyltrimethoxysilane was used instead of isooctyltriethoxysilane.

[0213] The results are shown in Table 1.

Embodiment 3

[0215] The procedure described in Example 1 was repeated, except that 100 g of cetyltrimethoxysilane was used instead of isooctyltriethoxysilane.

[0216] The results are shown in Table 1.

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Abstract

The invention relates to crosslinkable compounds based on organyloxy group-containing organopolysiloxanes, in particular organopolysiloxanes with low viscosities including such organopolysiloxanes with self-leveling properties, to methods for producing same, and to the use thereof, in particular as coatings or as liquid membranes, containing (A) organyloxy group-containing organopolysiloxanes of units of the formula (I) RaR1 b (OR2) cSiO(4-a-b-c) / 2, (B) organosilicon compounds of the formula (II) (R4O)dSiR3 (4-d) (II) and / or the partial hydrolysates thereof, (C) basic nitrogen-containing organosilicon compounds of the formula (III) (R6O)eSiR5 (4-e) (III) and / or the partial hydrolysates thereof, and (D) organosilicon compounds of the formula (IV) (R8O)hSiR7 (4-h) (IV) and / or the partial hydrolysates thereof, wherein the groups and indexes have the meanings specified in claim 1.

Description

technical field [0001] The present invention relates to crosslinkable (crosslinkable) compounds based on organopolysiloxanes containing organyloxy groups, in particular of low viscosity, including those with self-leveling properties. Compositions, to methods for their production and to their use, in particular as coatings (coatings) or as films applied as liquids. Background technique [0002] One-component (RTV-1) sealants that are water-resistant and storable but undergo curing to an elastomer when water enters have long been known. These products are used in large quantities, for example in the construction industry, as sealants for joints or facade joints, or can be applied as elastic coatings. These mixtures are based on silyl-terminated polymers with reactive substituents such as OH groups or hydrolyzable groups such as, for example, alkoxy groups. In addition, these sealants may contain fillers, plasticizers, crosslinkers, catalysts and additives. In this regard, r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/04
CPCC08G77/18C08G77/20C08L83/04C08K5/5425C08K5/544C08K5/5419C08K5/5333C08K5/5415C08K5/56C09D183/04C08G77/26C08G2150/00C08L2312/08
Inventor 沃尔弗拉姆·申德勒
Owner WACKER CHEM GMBH