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One-component low-viscosity dealcoholized silicone potting adhesive and preparation method thereof

A low-viscosity technology of silicone potting glue, applied in the direction of adhesives, non-polymer adhesive additives, adhesive additives, etc., can solve the problems of application limitations, short storage period of glue, metal copper polycarbonate plastic corrosion, etc. , to achieve good economic and social benefits, good adhesion of potting adhesive, and good storage stability

Active Publication Date: 2020-07-28
GUANGZHOU GLORYSTAR CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The vulcanization of two-component addition type silicone rubber depends on the temperature, and the vulcanization speed can be adjusted by temperature; but the disadvantage of two-component rubber is that the two components must be fully mixed according to the measurement before use, and the operation is inconvenient
[0004] At present, ketoxime type silicone sealant is mainly used in the largest amount in the domestic electronic and electrical industry, but because the ketoxime released after curing has an odor, and has a certain corrosion on metal copper and polycarbonate plastics, its application has been greatly affected. big limit
Most of the commercially available one-component alcohol-type silicone rubbers are catalyzed by titanate system, which is prone to viscosity peaks during the production process, which affects production, and the prepared rubber has a short storage period, making it difficult to meet market demand.
It is particularly difficult to prepare alcohol-based silicone potting compounds with good storage stability and low viscosity
So far, similar products on the market are rare

Method used

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  • One-component low-viscosity dealcoholized silicone potting adhesive and preparation method thereof
  • One-component low-viscosity dealcoholized silicone potting adhesive and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Put 100 parts of α,ω-dihydroxy polydimethylsiloxane with a viscosity of 400mPa·s and 2 parts of tetramethoxysilane into a stirring tank, stir evenly under vacuum, and then add 0.003 parts Sodium hydroxide, stirred in vacuum for 40 minutes, then added 0.008 parts of acetic acid, and continued to stir in vacuum for 60 minutes to obtain alkoxy-terminated polydimethylsiloxane.

[0031] (2) the chelated tin catalyst is the reflux of dibutyltin dilaurate and ethyl acetoacetate, and the preparation process is: in the reactor, add dibutyltin dilaurate and ethyl acetoacetate in a weight ratio of 1:1, Reflux at 60°C for 60 minutes. After cooling, the chelated tin catalyst is obtained.

[0032] (3) Add 100 parts of alkoxy-terminated polydimethylsiloxane, 4 parts of dimethyl silicone oil, and 5 parts of methyltrimethoxysilane into the stirred tank, stir in vacuum for 30 minutes, and then add 1 part in turn N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane, 0.5 part of γ-glycidyl...

Embodiment 2

[0035] (1) Put 100 parts of α,ω-dihydroxypolydimethylsiloxane with a viscosity of 1000mPa·s and 2.5 parts of vinyltrimethoxysilane into a stirring tank, stir evenly under vacuum, and then add 0.004 part of potassium hydroxide, stirred in vacuum for 40 minutes, then added 0.01 part of phosphoric acid, and continued to stir in vacuum for 60 minutes to obtain alkoxy-terminated polydimethylsiloxane.

[0036] (2) The chelated tin catalyst is the reflux of dibutyltin dilaurate and ethyl acetoacetate, and the preparation process is: in the reactor, add dibutyltin dilaurate and ethyl acetoacetate in a mass ratio of 1:2, Reflux at 80°C for 60 minutes. After cooling, the chelated tin catalyst is obtained.

[0037] (3) Add 100 parts of alkoxy-terminated polydimethylsiloxane and 6 parts of silicon micropowder into the kneader, heat up to 120°C under vacuum conditions, dehydrate for 3 hours, and cool to room temperature to obtain Binder.

[0038] (4) Add 106 parts of base material, 5 pa...

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Abstract

The invention provides a single-component and low-viscosity dealcoholized organosilicone pouring sealant and a preparation method thereof. The pouring sealant is prepared from components in parts by weight as follows: 100 parts of alkoxy-terminated polydimethylsiloxane, 0-5 parts of dimethicone, 3-7 parts of a cross-linking agent, 0-10 parts of filler, 1-3 parts of a bonding accelerator and 0.1-0.5 parts of a tin chelate catalyst. The single-component and low-viscosity dealcoholized organosilicone pouring sealant has excellent storage stability, low viscosity and high temperature and high humidity resistance, causes no corrosion and pollution to electronic components and is convenient to use.

Description

technical field [0001] The invention belongs to the field of silicone potting glue, and particularly relates to a single-component low-viscosity dealcoholized silicone potting glue and a preparation method thereof. The potting glue can be applied to potting of electronic appliances, circuit boards, LEDs, etc. water proof. Background technique [0002] Potting is the process of rationally arranging, assembling, connecting, and isolating and protecting electronic components from the environment. The function of potting is to strengthen the integrity of electronic components, improve the resistance to external damage, improve the insulation of internal circuits, and improve the waterproof and moisture-proof performance of electronic components. [0003] There are three main types of silicone potting compounds commonly used, namely one-component RTV silicone rubber, two-component condensation RTV silicone rubber and two-component addition RTV silicone rubber. The advantage of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J183/06C09J183/04C09J11/04C09J11/06C08G77/38
CPCC08G77/38C08K3/26C08K3/346C08K13/02C08K2003/2227C08K2003/265C08L2201/08C08L2203/206C08L2205/02C09J11/04C09J11/06C09J183/06C08L83/04C08K3/36C08K3/22
Inventor 曾军程小莲莫小萍何艺文张少鸿谢剑波邓丽华
Owner GUANGZHOU GLORYSTAR CHEM
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