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A low-ratio two-component dealcoholized silicone sealant and its preparation method and application

A two-component, dealcoholized technology, applied in adhesives, adhesive types, non-polymer adhesive additives, etc., can solve poor curing or bonding, slow substrate sticking speed, bonding failure, etc. problems, achieve the effect of reducing non-curing or poor bonding, simple production process, and fast curing speed

Active Publication Date: 2021-10-19
镇江莱博新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Patent No. CN 107868469 A discloses a water-resistant-ultraviolet adhesive dealcoholized two-component room temperature vulcanized silicone rubber and its preparation method. The plasticizer described in component B is vinyl-terminated polydimethylsiloxane , methyl polydimethylsiloxane and hydroxyl-terminated polydimethylsiloxane, choose this plasticizer, component B is easy to thicken, absorb oil or crystallize and solidify directly during storage, resulting in the failure of the product to be used normally. Or curing, bonding failure
[0005] Therefore, the products in the prior art are sensitive to the mixing ratio. Due to the error of the mixing ratio, problems such as curing or poor bonding are caused. , poor storage stability

Method used

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  • A low-ratio two-component dealcoholized silicone sealant and its preparation method and application
  • A low-ratio two-component dealcoholized silicone sealant and its preparation method and application
  • A low-ratio two-component dealcoholized silicone sealant and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Example 1 Preparation of low-ratio two-component dealcoholized silicone sealant

[0035] 1) Preparation of component A: 60 parts of α, ω-terminated hydroxyl polydimethylsiloxane with a viscosity of 20000mpa.s and a specific surface area of ​​18-20m 2 60 parts / g of nano-calcium carbonate, 5 parts of KH560 modified silicon powder with a particle size of 5 μm, mixed and stirred evenly and heated to 130 ° C, and defoamed for 1 hour, the rotation speed was 1000 rpm, the vacuum degree was -0.09Mpa, and cooled to <40 ° C to obtain A component.

[0036] 2) Preparation of component B: 60 parts of alkoxy-terminated polydimethylsiloxane with a specific surface area of ​​18-20m 2 60 parts / g of nano-calcium carbonate, 5 parts of KH560 modified silicon powder with a particle size of 5 μm are dispersed and mixed evenly at high speed, heated to 130 ° C, vacuumed for 1 hour, cooled to room temperature (<30 ° C) under vacuum, and added Ethyl orthosilicate, 10 parts of polymethyltrietho...

Embodiment 2

[0039] 1) Preparation of component A: 35 parts of α, ω-terminated hydroxyl polydimethylsiloxane with a viscosity of 80000mpa.s and a specific surface area of ​​18-20m 2 40 parts of nano-calcium carbonate / g, 5 parts of KH560 modified silicon powder with a particle size of 5 μm, and 10 parts of terminal methyl polydimethylsiloxane with a viscosity of 350 mpa.s, mix and stir evenly and heat up to 110 ° C, and defoam 2h, the rotation speed is 100rpm, the vacuum degree is -0.09Mpa, and cooled to <40°C to obtain component A.

[0040]2) Component B is prepared: 30 parts of alkoxy-terminated polydimethylsiloxane, the specific surface area of ​​the reinforcing filler is 18-20m 2 20 parts / g of nano-calcium carbonate, 15 parts of KH560 modified silicon powder with a particle size of 5 μm, dispersed and mixed evenly at a high speed, heated up to 110 ° C, vacuumed for 2 hours, cooled to room temperature (<30 ° C) under vacuum, and added positive Ethyl silicate, 4 parts of polymethyltrieth...

Embodiment 3

[0043] 1) A component is prepared: 50 parts of α, ω-hydroxyl-terminated polydimethylsiloxane with a viscosity of 20000mpa.s and 80000mpa.s (molar ratio 1:1) and a specific surface area of ​​18-20m 2 55 parts per gram of nano-calcium carbonate, 10 parts of KH560 modified silica powder with a particle size of 5 μm, and 5 parts of terminal methyl polydimethylsiloxane with a viscosity of 350 mpa.s, mix and stir evenly and heat up to 110 ° C, and defoam 2h, the rotation speed is 600rpm, the vacuum degree is -0.09Mpa, and cooled to <40°C to obtain component A.

[0044] 2) Preparation of component B: 60 parts of alkoxy-terminated modified polyether resin with a specific surface area of ​​18-20m 2 45 parts per gram of nano-calcium carbonate, 5 parts of KH560 modified silicon powder with a particle size of 3 μm, and 10 parts of silicon powder with a particle size of 5 μm, disperse and mix evenly at high speed, heat up to 110 ° C, vacuumize for 2 hours, and cool to At room temperature ...

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Abstract

The invention discloses a low-ratio two-component dealcoholized silicone sealant and its preparation method and application. 35-60 parts of hydroxyl-terminated polydimethylsiloxane, 35-65 parts of reinforcing filler, 0-10 parts of methyl-terminated polydimethylsiloxane; the B component includes the following components in parts by weight Preparation: 35-60 parts of alkoxy-terminated polymer, 35-65 parts of reinforcing filler, 4-10 parts of crosslinking agent, 0.1-5 parts of coupling agent, and 0.1-5 parts of organotin catalyst. The low-ratio two-component dealcoholized silicone sealant prepared by the invention is not sensitive to the mixing ratio, which reduces problems such as non-curing or poor bonding caused by mixing ratio errors. The low-ratio two-component dealcoholized silicone sealant of the present invention can be widely used in the sealing of aluminum frames of solar photovoltaic modules, the bonding of junction boxes and back plates, and the assembly of electronic components.

Description

technical field [0001] The invention belongs to the technical field of dealcoholized room temperature vulcanized silicone rubber, in particular to a low-ratio two-component dealcoholized silicone sealant and its preparation method and application. Background technique [0002] The curing speed of one-component room temperature vulcanized silicone rubber is limited by the moisture in the air, while the two-component dealcoholized silicone sealant divides the components into two components, which can be cured after mixing in proportion. , wide temperature range, waterproof and moisture-proof, ozone resistance, weather aging resistance, high dielectric strength, low dielectric loss, arc resistance, corona resistance and other advantages, widely used in solar photovoltaic module aluminum frame sealing, junction box and backplane Bonding, assembly of electronic components, etc. [0003] Patent No. CN 109135660 A discloses a dealcoholized two-component sealant and its preparation...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J183/04C09J171/00C09J11/04
CPCC08K2003/265C08K2201/011C08L2203/206C08L2205/025C09J11/04C09J183/04C08L83/04C08K13/06C08K9/06C08K3/36C08K3/26C08L71/00
Inventor 蔡琴李军明陈健
Owner 镇江莱博新材料科技有限公司
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