Room temperature vulcanized fluorosilicone rubber and preparation method thereof

A technology of fluorosilicone rubber and room temperature vulcanization, which is applied in the field of silicone rubber, which can solve the problems of rising colloidal temperature, rubber cross-linking and scrapping, and system viscosity rising, so as to improve oil resistance, enhance bonding performance, improve dispersibility and compatibility capacitive effect

Active Publication Date: 2019-12-17
GUANGZHOU DAOLIN SYNTHETIC MATERIALS CO LTD +2
View PDF9 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the preparation process, after the catalyst is added, there will be a short cross-linking process that will cause the viscosity of the system to rise sharply or even gel, which is usually called "viscosity peak". It needs high-speed shearing and standing for a period of time to reduce the viscosity. However, high-speed stirring will cause the temperature of the colloid to rise, which will seriously cause the rubber to be cross-linked and scrapped, which will cause difficulties in the regulation of production.
At the same time, due to the high activity of hydroxyl groups in α, ω-dihydroxypolydimethylsiloxane, the prepared silicone sealant has high activity. During storage, there will be a small amount of reaction between silicon hydroxyl groups and silanes. The alcohol is released, and under the action of the catalyst,

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
  • Room temperature vulcanized fluorosilicone rubber and preparation method thereof
  • Room temperature vulcanized fluorosilicone rubber and preparation method thereof
  • Room temperature vulcanized fluorosilicone rubber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] This embodiment provides a room temperature vulcanized fluorosilicone rubber and its preparation method, the steps are as follows:

[0056] (1) Preparation of methoxy-terminated fluoropolysiloxane

[0057] Mix trifluoropropyltrimethylcyclotrisiloxane, octamethylcyclotetrasiloxane and vinyl double head, then add macroporous cation exchange resin D002 to carry out polymerization reaction, after the reaction, filter and remove In addition to low-molecular reactants, vinyl-terminated fluorosilicone oil can be obtained; understandably, products with different fluorine contents can be prepared by adjusting the ratio of raw materials.

[0058] Mix the vinyl-terminated fluorosilicone oil and trimethoxyhydrogensilane, add a platinum catalyst, and carry out a hydrosilylation reaction at 65°C. The reaction time is 4h. Removal of small molecule reactants to prepare methoxy-terminated fluorine-containing polysiloxane.

[0059] (2) Prepare substrate tackifier

[0060] (3,3,3-trifl...

Embodiment 2

[0070] This embodiment provides a room temperature vulcanized fluorosilicone rubber and its preparation method, the steps are as follows:

[0071] (1) Preparation of ethoxy-terminated fluoropolysiloxane

[0072] Mix trifluoropropyltrimethylcyclotrisiloxane, octamethylcyclotetrasiloxane and vinyl double head, and then add tetramethylammonium hydroxide to carry out polymerization reaction. In addition to low-molecular reactants, vinyl-terminated fluorosilicone oil can be obtained; understandably, products with different fluorine contents can be prepared by adjusting the ratio of raw materials.

[0073] Mix the vinyl-terminated fluorosilicone oil and triethoxyhydrogensilane, add a platinum catalyst, and carry out a hydrosilylation reaction at 65°C. The reaction time is 4h. After the reaction, vacuumize, at 130°C, -0.1Mpa The small molecular reactant is removed under the condition of ethoxy-terminated fluorine-containing polysiloxane.

[0074] (2) Prepare substrate tackifier

...

Embodiment 3

[0085] This embodiment provides a room temperature vulcanized fluorosilicone rubber and its preparation method, the steps are as follows:

[0086] (1) Preparation of methoxy-terminated fluoropolysiloxane

[0087] Mix trifluoropropyltrimethylcyclotrisiloxane, octamethylcyclotetrasiloxane and vinyl double head, then add trifluoromethanesulfonic acid to carry out polymerization reaction, after the reaction, add sodium bicarbonate After neutralization, the low-molecular reactants are removed to obtain vinyl-terminated fluorosilicone oil; understandably, products with different fluorine contents can be prepared by adjusting the ratio of raw materials.

[0088] Mix the vinyl-terminated fluorosilicone oil and trimethoxyhydrogensilane, add a platinum catalyst, and carry out a hydrosilylation reaction at 65°C. The reaction time is 4h. Removal of small molecule reactants to prepare methoxy-terminated fluorine-containing polysiloxane.

[0089] (2) Prepare substrate tackifier

[0090] ...

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

The invention relates to a room -temperature vulcanized fluorosilicone rubber and a preparation method thereof. The room temperature vulcanized fluorosilicone rubber is prepared from, by weight, 100 parts of a base rubber, 5-10 parts of a cross-linking agent, 1-10 parts of a base material tackifier, 0.05-1 part of a catalyst and 30-100 parts of a colloid reinforcing agent; the base rubber is alkoxy-terminated fluorine-containing polysiloxane; and the cross-linking agent is fluoroalkylalkoxysilane. Compared with traditional dealcoholized RTV silicone rubbers, the room temperature vulcanized fluorosilicone rubber prepared in the invention has the advantages of greatly improved oil resistance, greatly improved antifouling property, greatly improved bonding property, greatly improved storage property and good processability.

Description

technical field [0001] The invention relates to the field of silicone rubber, in particular to room temperature vulcanized fluorosilicone rubber and a preparation method thereof. Background technique [0002] With the rapid development of electronic products, they are constantly favored by people and widely used in people's daily life. The demand for electronic products in the market is also increasing, and the performance requirements of electronic products are also getting higher and higher. For example, in the field of high-end electronic appliances, more and more attention has been paid to the effective protection of PCB electronic circuit boards. In order to prevent all kinds of moisture and mold from invading the circuit board, the RTV silicone rubber coated with some components on the electronic circuit board is required to be environmentally friendly, oil-resistant, solvent-resistant, waterproof, corrosion-resistant, have a certain self-cleaning performance, and at ...

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
IPC IPC(8): C08L83/08C08K13/04C08K7/26C08K5/544
CPCC08L83/08C08L2205/035C08L2205/025C08K13/04C08K7/26C08K5/544
Inventor 冯钦邦江广荣曾祥浩易勇王跃林欧阳喜仁
Owner GUANGZHOU DAOLIN SYNTHETIC MATERIALS CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap