Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for producing cross-linked siloxane network

A technology of siloxane and cyclic siloxane is applied in the field of preparing cross-linked siloxane network, which can solve the problem of reducing the pot life of the composition by strong alkali and the like

Inactive Publication Date: 2019-03-15
MILLIKEN & CO
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, the use of a strong base significantly reduces the "pot life" or "working time" of the composition once the components are combined

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for producing cross-linked siloxane network
  • Method for producing cross-linked siloxane network
  • Method for producing cross-linked siloxane network

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] This example illustrates the manufacture of compositions according to the invention and the manufacture of crosslinked silicone elastomers from said compositions.

[0083] The first part ("Part A") is prepared by combining (i) a siloxane compound comprising repeating units of cyclotrisiloxane having a structure conforming to formula (XL), (ii) a compound having a structure conforming to formula (XX) siloxane compounds, (iii) siloxane compounds conforming to the structure of formula (LX), and (iv) 2,2,4,4-tetramethyl-6,6-diphenylcyclotrisiloxane ( "Diphenyl-D 3 ”). A siloxane compound comprising a cyclotrisiloxane repeating unit of a structure conforming to formula (XL) is a polymer having a mass average molar mass of about 15,000 g / mol. The repeating unit of a structure conforming to formula (XL) In, the group R 41 with R 42 is methyl and the group R 43 with R 44 is phenyl. In addition to the repeating units according to the structure of formula (XL), the polymer ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A method for producing a cross-linked siloxane network comprises the steps of (a) providing a first part comprising a first siloxane compound and a cure inhibitor, (b) providing a second part, the second part comprising a hydroxide salt, (c) combining the first part and the second part to produce a reaction mixture, (d) heating the reaction mixture to a temperature sufficient for the hydroxide salt to open the ring of the cyclic siloxane moiety, and (e) maintaining the reaction mixture at an elevated temperature so that at least a portion of the opened cyclic siloxane moieties react with eachother to produce a cross-linked siloxane network.

Description

technical field [0001] The present application relates to methods of preparing crosslinked siloxane networks such as those found in silicone elastomers. Background technique [0002] Silicone compounds and silicones have many uses in modern industry. For example, silicone compounds have been widely used to produce crosslinked silicone polymers. These polymers are typically produced by hydrosilylation or condensation reactions. In the hydrosilylation reaction, the vinyl group-bearing siloxane compound undergoes addition to link the individual molecules of the compound by forming new Si-C bonds. Hydrosilylation reactions are typically catalyzed by platinum since platinum cannot be recovered from cured elastomers, which constitutes the cost of these polymers. In the condensation reaction, the siloxane compound reacts in the condensation reaction to form a new Si—O—Si bond between the molecules. This condensation reaction produces volatile organic compounds (VOCs) as by-prod...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/06C08G77/08C08L83/04
CPCC08G77/045C08G77/08C08L83/04C08K3/20C08K3/36C08K3/38C08K5/005C08K5/55C08L83/00C08G77/06C08K5/17C08K5/5415
Inventor R·A·斯特普尔顿S·斯里瓦斯塔瓦S·斯坦科维奇R·W·J·汉森王云章
Owner MILLIKEN & CO