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Preparation method of polyurethane drape adhesive

A technology of coating glue and polyurethane, applied in the direction of polyurea/polyurethane coating, coating, etc., can solve the problems of surface drying speed, slow curing speed, affecting the production speed of printed circuit board assembly line, etc., and achieve the effect of good transparency

Inactive Publication Date: 2014-01-15
YANTAI DARBOND TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the surface drying speed and curing speed of the general-purpose one-component moisture-curing polyurethane coating adhesive are relatively slow. Generally, the surface drying time at room temperature exceeds 30 minutes, and it takes more than 24 hours to fully cure, which affects the production speed of the printed circuit board assembly line.

Method used

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  • Preparation method of polyurethane drape adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] First, 15% methyl acetate and 20% dimethyl carbonate, 15% Dynacoll 7131 and 45% Dynacoll 7150, and 2% trimethylolpropane were added to 3 angstrom molecular sieves respectively, and left for 24 hours to detect that the moisture content was less than 300ppm. Qualified; then, add 15% Dynacoll 7131, 45% Dynacoll 7150, 6.5% toluene diisocyanate, 150ppm dimethyl tin dineodecanoate, 15% methyl acetate, 20% dimethyl carbonate, equipped with agitator, thermometer , a condenser tube and a four-necked flask filled with nitrogen, under the protection of nitrogen, react at 80°C for 3.5 hours; then, add 2% trimethylolpropane, and react at 80°C for 1.5 hours; finally, add 150ppm dineodecane at room temperature Acid dimethyl tin, 600ppm dimorpholine diethyl ether, 300ppm benzoyl chloride, 1.08% aminopropyltriethoxysilane, 1% BYK-A535, stir and mix evenly, and discharge.

[0021]

Embodiment 2

[0023] First, add 32% methyl acetate, 15% acetone, 50% Dynacoll 7131, and 2.66% trimethylolethane to 3 angstrom molecular sieves respectively, and place it for 24 hours. If the moisture content is less than 300ppm, it is qualified; then, add 50% Dynacoll 7131, 8.2% Diphenylmethane-4,4 ＇ -Diisocyanate, 300ppm dibutyltin dilaurate, 32% methyl acetate and 15% acetone were added to a four-necked flask equipped with a stirrer, thermometer, condenser tube and nitrogen filling device, and reacted at 80°C for 3.5 hours under nitrogen protection; Then, add 2.66% trimethylolethane and react at 80°C for 1.5 hours; finally, add 180ppm dibutyltin dilaurate, 1000ppm pentamethyldipropylenetriamine, 560ppm isooctanoic acid, 0.9% γ-cyclo Oxypropyloxypropyltrimethoxysilane, 0.8% BYK-A535, stir and mix evenly, then discharge.

[0024]

Embodiment 3

[0026] First, 24% methyl acetate and 8% propylene glycol methyl ether acetate, 30% Dynacoll 7140 and 10% Dynacoll 7152, and 3.6% pentaerythritol were added to 3 angstrom molecular sieves respectively, and left for 24 hours. It was qualified to detect that the moisture content was less than 300ppm; then , 30% Dynacoll 7140 and 10% Dynacoll 7152, 12% diphenylmethane-4,4 ＇ -Diisocyanate, 200ppm dimethyltin dineodecanoate, 24% methyl acetate and 8% propylene glycol methyl ether acetate are added in a four-necked flask equipped with a stirrer, thermometer, condenser and nitrogen device, under nitrogen protection , react at 80°C for 3.5 hours; then, add 3.6% pentaerythritol, and react at 80°C for 1.5 hours; finally, add 200ppm dimethyltin dineodecanoate, 800ppm dimorpholine diethyl ether, 600ppm benzoyl chloride, 1.2% aminopropyltriethoxysilane, 0.5% BYK-A535, stir and mix evenly, then discharge.

[0027] The performance of the one-component polyurethane coating glue of the present...

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Abstract

The invention relates to a preparation method of a polyurethane drape adhesive. The method comprises the steps that: a solvent, polyester polyol, and small-molecular polyol are subjected to dehydration treatments, wherein the materials are respectively added into 3-angstrom molecular sieves, and are placed for 24h; water content is detected, and the materials are qualified when water content is smaller than 300ppm; polyester polyol, isocyanate, 150-300ppm of a catalyst 1, and the solvent are added into a four-neck flask with a stirrer, a thermometer, a condensation pipe, and a nitrogen filling device; a reaction is carried out for 3-4h under a temperature of 80 DEG C under the protection of nitrogen; small-molecular polyol is added, and a reaction is carried out for 1-2h under a temperature of 80 DEG C; 150-200ppm of the catalyct 1, a catalyst 2, an anticoagulant, a thickener, and a defoaming agent are added; the mixture is well mixed by stirring, and is discharged.

Description

technical field [0001] The invention relates to a preparation method of a polyurethane coating adhesive, in particular to a preparation method of a fast-curing one-component polyurethane coating adhesive for printed circuit boards. Background technique [0002] Printed circuit board (PCB) coating adhesive is used for the protection of circuit boards and related components. In the real environment, humidity, salt spray, high temperature, chemical reagents, high dust, etc. may cause corrosion, softening, deformation, mildew and other problems on the circuit board or the components on it. Coating glue is coated on the surface of the circuit board to form a layer of barrier protective film, so that the circuit board can be protected from the above-mentioned various damages. [0003] At present, there are mainly three types of coating adhesives for printed circuit boards: silicone, polyurethane, and acrylate. Among them, polyurethane is mostly a single-component moisture-curing ...

Claims

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Application Information

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IPC IPC(8): C09D175/06C09D7/12C08G18/66C08G18/42C08G18/32C08G18/24
Inventor 姜蕊李清王建斌陈田安解海华
Owner YANTAI DARBOND TECH
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