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Organic silicon coating glue and preparation method thereof

A technology of coating glue and silicone, which is applied in the field of new silicone materials, can solve problems such as easy breakage or cracking, prolonged surface dry time, and affecting processing and use, so as to improve machinability, excellent aging resistance, and prolong use. The effect of longevity

Active Publication Date: 2022-03-25
YANTAI TIGHTSEN FINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005]Traditional room temperature dealcoholization condensation silica gel uses hydroxyl-terminated silicone oil (commonly known as 107 rubber) as the main raw material, which has the defect of high viscosity, and there will be a viscosity peak during processing, which affects For processing and use, the stability of the storage process is not good, the surface drying time is greatly prolonged, or even not cured; the toughness is poor, the strength is low, and it is easy to break or crack under impact, press, etc., which will affect the protective effect of the glue.
These problems hinder the development of silicone coating adhesives and need to be solved urgently

Method used

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  • Organic silicon coating glue and preparation method thereof
  • Organic silicon coating glue and preparation method thereof
  • Organic silicon coating glue and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0065] Synthesis of double-terminated alkoxy-terminated phenylpolysiloxane:

[0066] 1000g of double-ended vinylphenyl polydimethylsiloxane (R1 is vinyl, vinyl content 1.7wt%) having a viscosity of 50mPa·s with a structural formula such as (II) was stirred under vacuum at 150 degrees Celsius for 2h, and continued Stir and evacuate and cool down to 30°C; nitrogen (anhydrous) to break the vacuum and protect, add 1.1g chloroplatinic acid catalyst solution (weight ratio, anhydrous chloroplatinic acid:isopropanol=1:100), continue mixing for 30min; nitrogen Under protection, heat up to 100°C, add 110g of hydrogen-containing alkoxysilane, after the slow addition, react at 100°C for 2 hours; after the time is up, 120°C vacuum stir for 2 hours, remove low-boiling and unreacted raw materials; nitrogen protection to cool down At 25°C, add graphite powder to absorb and remove chloroplatinic acid; after filtration, obtain the desired double-terminated alkoxy-terminated phenyl polysiloxane-...

Embodiment 2

[0072] Synthesis of double-terminated alkoxy-terminated phenylpolysiloxane:

[0073] 1000g of double-ended vinylphenyl polydimethylsiloxane (R1 is vinyl, vinyl content 0.32wt%) with a viscosity of 1000mPa·s structural formula such as (II) was vacuum-stirred at 150 degrees Celsius for 2h, and continued Stir and evacuate and cool down to 30°C; nitrogen (anhydrous) to break the vacuum and protect, add 1.7g chloroplatinic acid catalyst solution (weight ratio, anhydrous chloroplatinic acid:isopropanol=1:100), continue mixing for 30min; nitrogen Under protection, raise the temperature to 100°C, add 22g of hydrogen-containing alkoxysilane, after the slow addition, react at 100°C for 2 hours; after the time is up, stir at 120°C for 2 hours in vacuum to remove low-boiling and unreacted raw materials; nitrogen protection to cool down At 25°C, add graphite powder to absorb and remove chloroplatinic acid; after filtration, obtain the desired double-terminated alkoxy-terminated phenyl poly...

Embodiment 3

[0079] Synthesis of double-terminated alkoxy-terminated phenylpolysiloxane:

[0080] Stir 1000g of double-ended vinylphenyl polydimethylsiloxane (R1 is vinyl, vinyl content 0.16wt%) with a viscosity of 5000mPa·s under vacuum for 2h at 150°C, continue Stir and evacuate and cool down to 30°C; nitrogen (anhydrous) to break the vacuum and protect, add 2.1g chloroplatinic acid catalyst solution (weight ratio, anhydrous chloroplatinic acid:isopropanol=1:100), continue mixing for 30min; nitrogen Under protection, raise the temperature to 100°C, add 12g of hydrogen-containing alkoxysilane, after the slow addition, react at 100°C for 2 hours; after the time is up, stir at 120°C for 2 hours under vacuum to remove low-boiling and unreacted raw materials; nitrogen protection to cool down At 25°C, add graphite powder to absorb and remove chloroplatinic acid; after filtration, the desired double-ended alkoxy-terminated phenyl polysiloxane-3 is obtained;

[0081] Synthesis of single-ended a...

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PUM

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Abstract

The invention discloses an organic silicon coating adhesive, which is prepared from the following components in parts by weight: 30 to 50 parts of methyl alkoxy phenyl silicone resin, 650 to 750 parts of double-end alkoxy terminated phenyl polysiloxane, 50 to 100 parts of single-end alkoxy terminated phenyl polysiloxane, 80 to 120 parts of phenyl methyl silicone oil, 10 to 50 parts of thixotropic agent, 1 to 5 parts of water removal agent, 50 to 100 parts of cross-linking agent, 10 to 30 parts of first coupling agent and 10 to 30 parts of second coupling agent, and 5-15 parts of a catalyst. The organic silicon coating glue disclosed by the invention has the advantages of no viscosity peak, excellent aging resistance, improved storage stability and greatly improved bonding strength. The invention also provides a preparation method of the organic silicon coating glue.

Description

technical field [0001] The invention relates to the field of new organosilicon materials, in particular to an organosilicon coating glue and a preparation method thereof. Background technique [0002] Coating glue, also known as conformal coating, coating glue, moisture-proof glue, insulating glue, etc., the English name is Conformal Coating. Coating rubber can be divided into the following systems: silicone resin, acrylic resin, polyurethane, synthetic rubber, synthetic resin, modified resin, fluorosilicone resin, etc. Among them, silicone resin coating rubber has excellent aging resistance , weather resistance, UV resistance and other characteristics, the direction of application is more extensive. [0003] Coating glue is generally coated on the circuit board of electronic components (PCBA, also called printed circuit board), and forms a layer of 0.02-0.2mm insulating and dense protective film on the circuit board to block the penetration of water vapor and the pollution...

Claims

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Application Information

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IPC IPC(8): C09D183/04C09D183/07C09D7/61
CPCC09D183/04C09D7/61C09D7/70C08L2201/08C08L83/04C08K7/26
Inventor 孙刚林志秀
Owner YANTAI TIGHTSEN FINE CHEM
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