Methoxy-terminated methylphenyl polysiloxane resin, silicone coating glue, preparation method and application

A technology of polysiloxane resin and terminal methyl phenyl group, applied in the field of coating protective materials, can solve the problems of reducing the transparency of organic coating glue, restricting the use of organic coating glue, etc.

Active Publication Date: 2021-04-06
广州天宸高新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in actual production, it is found that the addition of reinforcing agents seriously reduces the transparency of organic coating adhesives while increasing the strength, thus greatly limiting the use of organic coating adhesives

Method used

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  • Methoxy-terminated methylphenyl polysiloxane resin, silicone coating glue, preparation method and application
  • Methoxy-terminated methylphenyl polysiloxane resin, silicone coating glue, preparation method and application
  • Methoxy-terminated methylphenyl polysiloxane resin, silicone coating glue, preparation method and application

Examples

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preparation example Construction

[0028] The siloxane monomers for preparing methoxy-terminated methylphenyl polysiloxane resin include, by weight parts: 19-30 parts of diphenyldimethoxysilane, dimethyldimethoxysilane 20-30 parts and 40-60 parts of methyltrimethoxysilane; and the mass content of phenyl in the methoxy-terminated methylphenyl polysiloxane resin is 23%-25%. Wherein, the mass content of phenyl in the methoxy-terminated methylphenyl polysiloxane resin is the theoretical mass content of phenyl in the product calculated based on raw materials, the same below. The preparation method of the above-mentioned methoxy-terminated methylphenyl polysiloxane resin includes the following steps: reflux the above-mentioned siloxane monomer, acid catalyst and solvent at 70°C to 80°C for 2h to 6h, and filter to obtain the reaction solution, remove the solvent to obtain methoxy-terminated methylphenyl polysiloxane resin.

[0029] In one specific example, the acidic catalyst may be an acidic cation exchange resin, a...

Embodiment 1

[0052] The first step: the synthesis of methoxy-terminated phenylmethylpolysiloxane.

[0053] In a 2000mL four-necked flask equipped with a reflux condenser, a dryer, a dropping funnel and an electric stirrer, 193 parts of diphenyldimethoxysilane, dimethyldimethoxy 214 parts of silane, 450.6 parts of methyltrimethoxysilane, 18 parts of acidic cation exchange resin and 400 parts of methanol, slowly add 200 parts of measured deionized water at room temperature, and slowly continue to heat up to 75 ° C for reflux reaction for 4 hours after the addition is completed. After the reaction is over, filter out the cationic resin catalyst, continue to heat up to 110°C, and distill methanol under the condition of a vacuum of -0.09~-0.1MPa to obtain a colorless and transparent methoxy-terminated phenylmethyl group with a refractive index of 1.4602. Polysiloxane resin.

[0054] The second step: preparation of high-strength, high-transparency, high-airtight, high-friction-resistant silicon...

Embodiment 2

[0061] Example 2 is basically the same as Example 1, except that in the synthesis step of methoxy-terminated phenylmethylpolysiloxane, by weight, 300 parts of diphenyldimethoxysilane, two 220 parts of methyldimethoxysilane, 415 parts of methyltrimethoxysilane, 22 parts of acidic cation exchange resin and 400 parts of methanol, slowly add 200 parts of metered deionized water dropwise at room temperature, and slowly continue to heat up to 70 ° C reflux reaction for 6h.

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Abstract

The invention relates to a methoxy-terminated methylphenyl polysiloxane resin, a silicone coating glue, a preparation method and an application thereof, and the silicone material for preparing the methoxy-terminated methylphenyl polysiloxane resin is Oxygen monomers include: 19-30 parts of diphenyldimethoxysilane, 20-30 parts of dimethyldimethoxysilane and 40-60 parts of methyltrimethoxysilane; The mass content of phenyl groups in the group-terminated methylphenyl polysiloxane resin is 23% to 25%. The above-mentioned methoxy-terminated methylphenyl polysiloxane resin is terminated with methoxy groups and has a suitable content of phenyl groups, so that its refractive index is very close to that of fumed silica and has a suitable viscosity . Using this polysiloxane resin to replace the base material in the traditional organic coating adhesive, and adding fumed silica as a reinforcing agent can significantly improve the mechanical properties such as hardness and tensile strength on the basis of ensuring high transparency , Adhesive performance and air tightness.

Description

technical field [0001] The invention relates to the technical field of coating protection materials, in particular to a methoxy-terminated methylphenyl polysiloxane resin, a silicone coating glue, a preparation method and an application. Background technique [0002] With the rapid development of the electronic technology industry, the components on the circuit board are becoming more and more sophisticated, and the application environment is also becoming harsher, which puts forward higher requirements for the glue that provides three-proof protection. Silicone coating adhesive is widely used in the bonding of electronic and electrical components because of its superior high and low temperature resistance, environmental protection, non-corrosion, and economical properties, and is also widely used in the coating of circuit boards. Play the role of moisture-proof, mildew-proof and salt spray-proof on the surface. [0003] At present, there are two main types of silicone coat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G77/18C08G77/06C09J183/06
CPCC08G77/06C08G77/18C09J183/06
Inventor 梁光岳邱浩孟王坤温茂添戴思维
Owner 广州天宸高新材料有限公司
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