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Low-modulus silicone sealant and preparation method thereof

A silicone and sealant technology, applied in the field of sealants, can solve problems such as inconvenient use and troublesome use of two-component products, and achieve the effect of solving viscosity problems

Active Publication Date: 2015-04-01
广东欧利雅化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Two-component products are more troublesome to use, especially when used on the construction site

Method used

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Examples

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preparation example Construction

[0049] The preparation method of low modulus silicone sealant is characterized in that, the preparation method of described low modulus silicone sealant comprises the following steps:

[0050] (a) Preparation of vinyl-terminated polydimethylsiloxane emulsion: first, pre-react 0.01 part of lithium hydroxide with 100 parts of dimethylsiloxane linear body to make alkali glue, and set aside; then take out the spare alkali glue Mix 0.01 part with 100 parts of dimethyl siloxane linear body, 0.01 part of vinyl capping agent, 0.005 part of platinum chrome compound, and 2 parts of MQ resin, then add 3 parts of alkylphenol polyoxyethylene ether and stir, Add 100 parts of water to emulsify evenly, heat to 90-100°C, and react for 3 hours to make vinyl-terminated polydimethylsiloxane emulsion;

[0051] (b) Preparation of hydrogen-containing polysiloxane emulsion: Put 100 parts of hydrogen-containing silicone oil, 3 parts of alkylphenol polyoxyethylene ether, and 100 parts of water into an ...

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PUM

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Abstract

The invention discloses a low-modulus silicone sealant and a preparation method thereof. The silicone sealant comprises the following components: a vinyl-terminated polydimethylsiloxane emulsion, a hydrogen-containing polysiloxaneemulsion, filler, an emulsifier and the like, wherein each molecule of vinyl-terminated polydimethylsiloxaneof the vinyl-terminated polydimethylsiloxane emulsion contains at least two vinyl groups averagely, and each molecule of hydrogen-containing polysiloxane of the hydrogen-containing polysiloxaneemulsion contains at least two Si-H groups averagely. The preparation method of the low-modulus silicone sealant comprises the steps as follows: the vinyl-terminated polydimethylsiloxane emulsion and the hydrogen-containing polysiloxaneemulsion are prepared respectively, and then the two emulsions are mixed with fumed silica, the emulsifier, the filler and the water to obtain a product. The low-modulus silicone sealant and the preparation method thereof have the advantages as follows: organo-silicon polymer is taken as a base material to prepare the low-modulus viscoelastic silicone sealant with low viscoelasticity, the elongation of the sealant after curing is higher than 1,000%, the strength is lower than 0.1 MPa, and the sealant has extremely low modulus and is particularly suitable for bonded seal of foam materials for construction insulation.

Description

technical field [0001] The invention relates to the field of sealants, in particular to a low-modulus silicone sealant, which is suitable for sealing building joints, especially for substrates with low tensile strength, such as foamed polystyrene board joints and concrete joints . Background technique [0002] In construction, industry and daily life, it is necessary to use a large number of sealants to seal the joints, such as doors and windows, wardrobes, instruments and so on. There are many types of sealants: silicone sealants, acrylics, polyurethanes, neoprene, and more. Most of these sealants will solidify into elastomers or plastics, which will produce a sealing effect in the joint. When the joint changes, the cured sealant will follow the change of the joint to achieve the sealing effect. When the cured sealant changes with the joint, it will generate deformation stress, acting on the bonding surface of the bonded substrate. When the tensile strength of the substr...

Claims

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Application Information

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IPC IPC(8): C09J183/07C09J183/05C09J11/08C09J11/04
Inventor 许萌芳
Owner 广东欧利雅化工有限公司