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One-component heating-cured 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 short storage time at room temperature, large thixotropy, and increased viscosity, and achieve long-term stability, excellent adhesion, and good thermal conductivity.

Inactive Publication Date: 2016-02-17
镇江高美新材料有限公司
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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.
[0009] 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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Add 100 parts of vinyl polysiloxane, 50 parts of aluminum oxide after pretreatment, 50 parts of aluminum nitride, 30 parts of aluminum hydroxide and 10 parts of fumed white carbon black into the kneader, stir evenly, and heat up to 130°C After vacuuming and stirring for 2 hours, take it out and grind it once on a three-roller to obtain a basic rubber compound with evenly dispersed fillers.

[0039] Take 100 parts of the base rubber material and stir in the planetary kettle, add 3 parts of hydrogen-based polysiloxane according to the mass of the added base material, 0.5 parts of vinyl triethoxy silane, and 0.005 parts of butyne After stirring the alcohol and 0.005 cyclohexynol evenly, add 0.05 parts of platinum complex catalyst and stir for 2 hours. Filtered packaging can be formulated into one-component heat-curing silicone rubber.

[0040] Among them, the pretreatment of fillers (including alumina, aluminum nitride or aluminum hydroxide)

[0041] Add 100 parts (parts by mas...

Embodiment 2

[0043] Add 100 parts of vinyl polysiloxane, 100 parts of aluminum oxide after pretreatment, 80 parts of aluminum nitride, 50 parts of aluminum hydroxide and 20 parts of fumed white carbon black into the kneader, stir evenly, and raise the temperature to 160°C , After vacuuming and stirring for 6 hours, take it out and grind it twice on a three-roller to obtain a basic rubber compound with evenly dispersed fillers.

[0044] Take 100 parts of the basic rubber material and stir in the planetary kettle, add 6 parts of hydrogen-based polysiloxane according to the mass of the added basic rubber material, 2 parts of vinyl trimethoxysilane tackifier, 0.01 part of butynol and After stirring 0.01 part of cyclohexynol, add 0.2 part of platinum complex catalyst and stir for 4 hours. Filtered packaging can be formulated into one-component heat-curing silicone rubber.

[0045] Pretreatment of fillers (including aluminum oxide, aluminum nitride or aluminum hydroxide)

[0046] Add 100 parts (parts...

Embodiment 3

[0048] Add 100 parts of vinyl polysiloxane, 80 parts of aluminum oxide after pretreatment, 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 vacuuming and stirring for 5 hours, take it out and grind it once on a three-roller to obtain a basic rubber compound with evenly dispersed fillers.

[0049] Take 100 parts of the basic rubber material and stir in the planetary kettle, add 5 parts of hydrogen-based polysiloxane obtained according to the mass of the added basic rubber material, γ―(2,3-glycidoxy)propyltrimethoxy 1.5 parts of silane tackifier, 0.008 parts of butynol and 0.007 parts of cyclohexynol, after stirring uniformly, add 0.1 part of platinum complex catalyst and stir for 3 hours. Filtered packaging can be formulated into one-component heat-curing silicone rubber.

[0050] Pretreatment of fillers (including aluminum oxide, aluminum nitride or aluminum hydroxide)

[0051] Add ...

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Abstract

The invention belongs to the field of liquid silicone rubber and particularly relates to one-component heating-cured liquid silicone rubber and a preparation method thereof. According to the one-component heating-cured liquid silicone rubber, vinyl polysiloxane is taken as base rubber, hydrogen-based polysiloxane is taken as a cross-linking agent, a complex of transition metal platinum is taken as a catalyst, an alkynol mixture is taken as a high-efficiency polymerization inhibitor, aluminum oxide and aluminum nitride are taken as heat conducting filler, a silane coupling agent is taken as a thickening agent, aluminum hydroxide is taken as a fire retardant, and fumed silica is taken as a reinforcing agent. Technologically, strict control is adopted, a process route that raw materials are preprocessed and dried and then are subjected to rubber preparation after normal-temperature mixing is adopted, and the one-component heating-cured liquid silicone rubber is prepared. The one-component heating-cured liquid silicone rubber can be stored at the normal temperature for long time, is low in viscosity, good in heat conductivity, good in temperature endurance and good in substrate adhesion property and has one component and flame retardancy.

Description

Technical field [0001] The invention belongs to the field of liquid silicone rubber, and in particular relates to a single-component heating and curing liquid silicone [0002] Rubber and its preparation method. Background technique [0003] Silicone rubber is a polymer material that has excellent electrical properties and chemical inertness, heat resistance, aging resistance, moisture resistance, air permeability, and can maintain elasticity for a long time in the range of -60~200℃. It can realize rapid curing under high temperature, convenient processing and forming, easy to realize automation, saving energy and labor, and it is widely used in the automatic production process. [0004] One-component silicone rubber is divided into condensed one-component silicone rubber and addition-molded one-component silicone rubber. The condensed one-component silicone rubber can only be cured at room temperature, and the curing is slow in use, and cannot be cured at the same time inside and o...

Claims

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Application Information

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IPC IPC(8): C08L83/07C08L83/05C08K13/06C08K9/06C08K3/22C08K3/36C08K3/28C08K5/05
Inventor 王超欧金海
Owner 镇江高美新材料有限公司
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