Synthesis method of modified polyurethane resin for circuit board

A technology of polyurethane resin and synthesis method, which is applied in the direction of polyurea/polyurethane coatings, coatings, anti-corrosion coatings, etc., can solve the problems of brittle texture, flexibility and poor adhesion, and achieve increased solubility, good flexibility and Excellent adhesion and fullness

Active Publication Date: 2014-03-26
ZHUHAI CHANGXIAN CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a method for synthesizing a modified polyurethane resin for circuit boards, that is, a method for synthesizing a modified polyurethane conformal paint, which solves the problem of the brittle texture, poor flexibility and poor adhesion of the polyurethane conformal paint in the prior art , technical issues that need to be further improved in gloss and fullness

Method used

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  • Synthesis method of modified polyurethane resin for circuit board
  • Synthesis method of modified polyurethane resin for circuit board

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Experimental program
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Embodiment 1

[0024] Embodiment 1: Synthesis of polyhydroxy polyester resin at first: octylic acid and ethylene glycol are 1:2 synthetic polyhydroxy polyester resin of hydroxyl value 500mgKOH / g by weight; Then add 71.6KG (446.8 mol) of polyhydroxy polyester resin, 148.9KG (148.9mol) of polyether polyol resin, wherein the molecular weight of polyether polyol resin is 3000, and the hydroxyl value is 50mg KOH / g. MDI-50298.2KG, ethyl acetate 206.1KG and xylene 238.2KG, heat up to 60°C, after constant temperature reaction for 1 hour, then add 1KG of dibutyltin dilaurate, continue constant temperature reaction for 1 hour, then add neopentyl glycol 18.6KG, after constant temperature reaction for 1 hour, then add 10.6KG trimethylolpropane, after constant temperature reaction for 1 hour, raise the temperature of the reactor to 80°C, after constant temperature reaction for 6 hours, wait for the temperature of the reactor to drop by 59°C, use 32.8 KG of butyl acetate dilutes the product and filters it...

Embodiment 2

[0025] Embodiment 2: Synthesizing polyhydroxy polyester resin at first: be that 1:3 synthetic polyhydroxy polyester resin of hydroxyl value is 500mgKOH / g by carbon nonacid and neopentyl glycol by weight first; Then add in the reaction kettle successively 47.8KG (297.9mol) of polyhydroxy polyester resin (70% solid content), 297.9KG (297.9mol) of polyether polyol resin, wherein the molecular weight of polyether polyol resin is 3000, and the hydroxyl value is 55mg KOH / g . MDI-50298.2KG, ethyl acetate 206.1KG and xylene 238.2KG, then the temperature of the reaction kettle was raised to 60°C, after a constant temperature reaction for 1 hour, 1KG of stannous octoate was added, and the constant temperature reaction was continued for 1 hour, and neopentyl glycol 18.6 After KG, react at a constant temperature for 1 hour, add 10.6KG of trimethylolpropane, keep the temperature at a constant temperature for 1 hour, raise the temperature of the reactor to 80°C, and react at a constant temp...

Embodiment 3

[0026] Embodiment 3: Synthesis of polyhydroxy polyester resin at first: first by dodecanoic acid and trimethylolpropane in a weight ratio of 1:2.5 synthetic polyhydroxy polyester resin with a hydroxyl value of 500mgKOH / g; Add 76.4KG of polyhydroxy polyester resin and 119.1KG of polyether polyol resin, wherein the polyether polyol resin has a molecular weight of 3000 and a hydroxyl value of 60 mgKOH / g. MDI-50298.2KG, ethyl acetate 206.1KG and xylene 238.2KG, the temperature of the reactor was raised to 60°C, and the reaction was performed at a constant temperature for 1 hour. After adding 1KG of bismuth isooctanoate, the reaction was continued at a constant temperature for 1 hour, and after adding 18.6KG of neopentyl glycol ,Constant temperature reaction for 1 hour, after adding 10.6KG of trimethylolpropane, constant temperature reaction for 1 hour, the temperature of the reactor was raised to 80°C, constant temperature reaction for 6 hours, after the temperature of the reactor ...

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Abstract

The invention provides a synthesis method of a modified polyurethane resin for a circuit board. The synthesis method comprises the steps of synthesizing polyhydroxy polyester resin, adding polyether polyol resin, MDI-50 and a dissolvent to react at a temperature from 60 DEG C to 70 DEG C, then adding neopentyl glycol or glycol to react at a constant temperature, adding trimethylolpropane to react at the constant temperature, and finally lowering the temperature of a reactor below 60 DEG C and obtaining the modified polyurethane resin after filtration. According to the synthesis method, the modified polyurethane resin has excellent flexibility and adhesion by combining the polyhydroxy polyester resin and the polyether polyol resin, the luster and fullness of the modified polyurethane resin can be ameliorated by combining the neopentyl glycol or the glycol, the high hardness of the modified polyurethane resin is achieved by combining the trimethylolpropane, the overall modified polyurethane resin has excellent fullness, and the modified polyurethane resin is used for the circuit board, and can prevent equipment from being corroded in the environment so as to prolong the service life of the equipment.

Description

technical field [0001] The invention relates to a protective material for circuit boards, in particular to a synthesis method of modified polyurethane resin for circuit boards. Background technique [0002] During the use of the circuit board, it may be in different environmental conditions, such as chemical substances (fuel, coolant, etc.), vibration, high dust, salt spray, humidity and high temperature, etc. The circuit board may be corroded, softened, deformed, moldy, etc. Change and other problems, resulting in circuit failure. Conformal paint is a specially formulated coating used to protect circuit boards and related equipment from environmental erosion, thereby improving and prolonging their service life and ensuring the safety and reliability of use. Apply the three-proof paint to the surface of the circuit board to form a layer of light and flexible three-proof protective film with a thickness of 0.5-0.8 mm. The three-proof refers to moisture-proof, salt-spray and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/66C08G18/48C08G18/42C08G18/32C09D175/08C09D175/06C09D5/08C09D5/00
CPCC08G18/12C08G18/6696C08G18/7671C08G2150/90C09D5/08C09D175/08C08G18/3206
Inventor 杨伟明王海艳
Owner ZHUHAI CHANGXIAN CHEM TECH
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