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Room-temperature cured phenyl silicon resin conformal coating

A phenyl silicone resin, room temperature curing technology, applied in the direction of coating, etc., can solve the problems of low surface hardness, low surface strength and hardness, easy to absorb dust, etc., and achieve the effect of good elasticity, excellent high and low temperature performance, and high transparency

Active Publication Date: 2013-05-22
MIANYANG WELLS ELECTRONICS MATERIAIS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As we all know, organosilicon materials (such as silicone rubber, silicone gel and silicone resin, etc.) are widely used in various electronic components due to their good comprehensive properties for insulation, moisture-proof, shock-proof and related electronic components. protective effect; single-component silicone rubber can be cured at room temperature, and the dielectric properties are relatively good, but the surface strength and hardness after curing are low, and the application is limited; two-component silicone rubber needs to be measured by two components Coating or potting after mixing is not conducive to efficient construction and is also limited by the operating time; silicone gel has high transparency, but the surface hardness is lower after curing, and it is easy to absorb dust, so it cannot be applied outdoors or exposed In the harsh environment; silicone resin can achieve high surface hardness and strength after curing, but most silicone resins (such as methyl silicone resin, silicone glass resin, etc.) have poor toughness after curing, and are prone to high and low temperature impact In addition, most silicone resins usually need to be cured at high temperature (150°C or even above 200°C), which not only far exceeds that of some electronic devices (such as various printed circuit board assemblies) The highest temperature it can withstand, and high temperature operation will also bring great trouble to assembly and production

Method used

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  • Room-temperature cured phenyl silicon resin conformal coating
  • Room-temperature cured phenyl silicon resin conformal coating
  • Room-temperature cured phenyl silicon resin conformal coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 300g of phenyltrimethoxysilane and 300g of toluene into a 1L three-necked flask. Add 60g of 0.01% hydrochloric acid aqueous solution dropwise to the flask at room temperature and rapid stirring. The dropping time is controlled at about 20min. The hydrochloric acid aqueous solution is added dropwise. After the completion, the temperature was raised to 75°C and refluxed for 3h. After the reflux reaction, the temperature was reduced to 50°C and 1.06g of hexamethyldisilazane was added and stirred for 0.5h. After that, the reaction was stopped, and the reaction solution was cooled and allowed to stand and then filtered The temperature of the filtered reaction solution was raised to 120° C. The by-product methanol and part of the solvent were distilled out to obtain 352 g of translucent phenyl silicone resin. The solid content of the resin was 60%.

[0024] In a 1L three-necked flask equipped with nitrogen protection and water separator, 190g of the phenyl silicone resin prep...

Embodiment 2

[0027] Add 220g of phenyltrimethoxysilane, 64g of methylphenyldimethoxysilane and 295g of toluene into a 1L three-necked flask, and add 73.3g of 0.01% hydrochloric acid aqueous solution into the flask at room temperature and rapid stirring. The dripping time is controlled at about 20min. After the hydrochloric acid aqueous solution is dripped, the temperature is increased to 75°C and the reaction is refluxed for 4.5h. After the reflux reaction is completed, the temperature is reduced to 50°C and 1.29g of hexamethyldisilazane is added and stirred for 0.5h. After that, the reaction was stopped, the reaction solution was cooled and left to stand and then filtered. The filtered reaction solution was heated to 120-130°C. The by-product methanol and part of the solvent were distilled out at atmospheric pressure to obtain 325g of translucent phenyl silicone resin. The solid content is about 55%.

[0028] Into a 1L three-necked flask equipped with nitrogen protection and water separation...

Embodiment 3

[0031] Using the phenyl silicone resin prepared in Example 1, the hydroxy-terminated polydimethylsiloxane with a viscosity of 80 mpa.s in Example 1 was replaced with a hydroxy-terminated polydimethylsiloxane with a viscosity of 200 mpa.s , And other conditions remain unchanged, the conformal coating III is prepared.

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Abstract

The invention discloses a room-temperature cured phenyl silicon resin conformal coating which comprises components A) a segmented copolymer of phenyl silicon resin and linear polyorganosiloxane or methyl phenyl silicon resin and linear polyorganosiloxane, B) alkoxy silane, C) a silane coupling agent containing amino or epoxy group, D) an organic titanium compound, E) organic phosphate flame retardant synergist, and (F) an organic hydrocarbon solvent or low molecular weight siloxane, wherein the organic hydrocarbon solvent is one or multiple of methylbenzene, dimethylbenzene, petroleum ether, cyclohexane and normal heptane; and the low molecular weight siloxane is a mixture of octamethyl-trisiloxan, octamethyl cyclotetrasiloxane or methyl cyclosiloxane. A product produced by the cured resin conformal coating of the invention has the advantages of very high transparency, good elasticity, tough and wearable surfaces as well as excellent high / low temperature performance, waterproofing, heat resistance, cold resistance, weathering resistance, ultraviolet ray resistance, medium resistance, irradiation resistance, flame retarding and the like.

Description

Technical field [0001] The invention relates to a resin coating, in particular to a phenyl silicone resin conformal coating that can be cured at room temperature. Background technique [0002] With the development of science and technology, long-term and reliable protection of sensitive circuits and components has become increasingly important in many sophisticated and demanding electronic product applications. As we all know, silicone materials (such as silicone rubber, silicone gel and silicone resin, etc.) are widely used in various electronic components due to their good comprehensive properties to provide insulation, moisture resistance, shock resistance and related electronic components. The protective effect of one-component silicone rubber can be cured at room temperature, and the dielectric properties are relatively good, but the surface strength and hardness after curing are low, and the application is subject to certain restrictions; two-component silicone rubber needs...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D183/10C09D7/12C09D5/25
Inventor 芦成陆南平
Owner MIANYANG WELLS ELECTRONICS MATERIAIS
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