Single-component heat-curing liquid silicone rubber and preparation method thereof

A liquid silicone rubber, heating and curing technology, applied in the field of liquid silicone rubber, can solve the problems of vulcanization, large thixotropy, and short storage time at room temperature, and achieve excellent temperature resistance, good thermal conductivity, and long-term stability.

Active Publication Date: 2013-04-10
CHENGDU TALY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This product has the following disadvantages in production and application: In terms of production, the added filler has a great influence on heat resistance, thermal conductivity and product viscosity. Adding too much filler will increase the viscosity and thixotropy. The decrease in viscosity brings troubles to production control; in terms of application: 1. When used as a sealant or adhesive, the bonding strength to the substrate is not enough and easy to peel off; 2. Good thermal conductivity, excellent flame retardancy and good strength The product has a high viscosity and is not suitable for handling
3. The storage performance of the product is not good. The storage period at room temperature does not exceed 6 months. After the storage time exceeds 6 months, the performance will decline. In serious cases, it will be directly vulcanized and cannot be used.
4. General long-term high temperature resistance
[0010] 3. Fast curing under heating: As an assembly line production operation, in order to ensure work efficiency, it is necessary for this special silica gel to be able to quickly cure under heating conditions. If it cannot be cured quickly, it will lead to a lot of waste of time in the workflow and affect production efficiency.
General one-component heat-cured silicone rubber has a short storage time at room temperature and is stored at low temperature.

Method used

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  • Single-component heat-curing liquid silicone rubber and preparation method thereof
  • Single-component heat-curing liquid silicone rubber and preparation method thereof
  • Single-component heat-curing liquid silicone rubber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Add 100 parts of vinyl polysiloxane, 50 parts of pretreated alumina, 50 parts of aluminum nitride, 30 parts of aluminum hydroxide and 10 parts of fumed silica into the kneader, stir evenly, and heat up to 130°C , after vacuum stirring for 2 hours, take it out, and grind it once on a three-roller machine to obtain a base compound with evenly dispersed fillers.

[0045] Take 100 parts of the base rubber and stir in a planetary kettle, add 3 parts of hydropolysiloxane obtained according to the mass of the added base rubber, 0.5 parts of vinyltriethoxysilane as a tackifier, and 0.005 parts of butyne Alcohol and 0.005 cyclohexynol, after stirring evenly, add 0.05 parts of platinum complex catalyst, and stir for 2 hours. Filtered packaging can be formulated into one-component heat-cured silicone rubber.

[0046] Among them, the pretreatment of fillers (including alumina, aluminum nitride or aluminum hydroxide)

[0047] Add 100 parts (parts by mass, the same below) of alu...

Embodiment 2

[0049] Add 100 parts of vinyl polysiloxane, 100 parts of pretreated aluminum oxide, 80 parts of aluminum nitride, 50 parts of aluminum hydroxide and 20 parts of fumed silica into the kneader, stir evenly, and heat up to 160°C After evacuating and stirring for 6 hours, take it out, and grind it twice on a three-roller machine to obtain a base compound with evenly dispersed fillers.

[0050] Take 100 parts of the base rubber and stir in a planetary kettle, add 6 parts of hydropolysiloxane obtained according to the mass of the added base rubber, 2 parts of vinyltrimethoxysilane tackifier, 0.01 part of butynol and 0.01 part of cyclohexynol, after stirring evenly, add 0.2 part of platinum complex catalyst, and stir for 4 hours. Filtered packaging can be formulated into one-component heat-cured silicone rubber.

[0051] Pretreatment of fillers including alumina, aluminum nitride or aluminum hydroxide

[0052] Add 100 parts (parts by mass, the same below) of alumina, aluminum nitr...

Embodiment 3

[0054] Add 100 parts of vinyl polysiloxane, 80 parts of pretreated aluminum oxide, 70 parts of aluminum nitride, 40 parts of aluminum hydroxide and 15 parts of fumed silica into the kneader, stir evenly, and heat up to 150°C , after evacuating and stirring for 5 hours, take it out, and grind it once on a three-roller machine to obtain a base compound with evenly dispersed fillers.

[0055] Take 100 parts of the base rubber and stir in the planetary kettle, add 5 parts of hydropolysiloxane obtained according to the mass of the added base rubber, γ-(2,3-epoxypropoxy)propyltrimethoxy 1.5 parts of silane tackifier, 0.008 part of butynol and 0.007 part of cyclohexynol, after stirring evenly, add 0.1 part of platinum complex catalyst, and stir for 3 hours. Filtered packaging can be formulated into one-component heat-cured silicone rubber.

[0056] Pretreatment of fillers including alumina, aluminum nitride or aluminum hydroxide

[0057] Add 100 parts (parts by mass, the same belo...

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Abstract

The invention belongs to the field of liquid silicone rubber, and particularly relates to single-component heat-curing liquid silicone rubber and a preparation method thereof. Ethenyl polysiloxane is used as base rubber, hydrogen polysiloxane is used as a cross-linking agent, a complex of transition metal platinum is used as a catalyst, an alkynol mixture is used as an efficient polymerization inhibitor, aluminum oxide and aluminium nitride are used as heat conductive fillers, a silane coupling agent is used as a tackifier, aluminium hydroxide is used as a fire retardant, and fumed silica is used as a reinforcing agent. As a process is strictly controlled, and a process route that raw materials are treated and dried in advance, and mixed at room temperature to prepare the rubber is adopted, the low-viscosity single-component heat-curing silicone rubber is prepared. The fire retardant single-component heat-curing liquid silicone rubber can be stored for a long term at normal temperature, is low in viscosity, single in component, good in heat conductivity and temperature tolerance, and good in adhesion with a base material.

Description

technical field [0001] The invention belongs to the field of liquid silicone rubber, in particular to a single-component heating-curing liquid silicone rubber and a preparation method thereof. [0002] Background technique [0003] Silicone rubber is a polymer material with excellent electrical properties and chemical inertness, heat resistance, aging resistance, moisture resistance, breathability, and long-term elasticity in the range of -60 to 200 ° C. Fast curing at high temperature, convenient processing and molding, easy to realize automation, saving energy and labor, and widely used in automated production processes. [0004] One-component silicone rubber is divided into condensation-type one-component silicone rubber and addition-type one-component silicone rubber. Among them, condensation-type one-component silicone rubber can only be cured at room temperature, and it has slow curing in use, and cannot be cured and vulcanized simultaneously inside and outside. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08L83/05C08K13/06C08K9/06C08K3/22C08K3/28C08K3/36
Inventor 陶云峰张先银徐燕芬陈群跃方辉阮开敏
Owner CHENGDU TALY TECH CO LTD
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