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Polyurethane three-proofing coating

A technology of polyurethane conformal paint and polyurethane modification, which is applied in the direction of polyurea/polyurethane coatings and coatings, and can solve problems such as harmfulness to the human body and application restrictions of polyurethane conformal paint

Inactive Publication Date: 2014-04-30
YIYUAN ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in the mainstream market, most polyurethane conformal coating systems contain aromatic solvents or lead-containing substances, which are harmful to the human body, thus limiting the application of polyurethane conformal coatings

Method used

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  • Polyurethane three-proofing coating
  • Polyurethane three-proofing coating
  • Polyurethane three-proofing coating

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0043] The preparation method of polyurethane three-proof paint is characterized in that it consists of the following steps:

[0044] Add the alkyd resin and polyisocyanate into the three-necked bottle according to the metering, mix evenly and heat up to 88-90°C, and react for 1.5h; after 1.5h, add the metered small molecule polyol into the three-necked bottle, and adjust the temperature to 68-90°C 70°C, react for 5h; add measured solvent after 5h, react at 60-62°C for 3h; after the reaction, cool and discharge to obtain polyurethane modified alkyd resin;

[0045] First add a drier to the polyurethane modified alkyd resin, stir, then add an anti-skinning agent and fluorescent powder, and stir to obtain a polyurethane conformal coating.

[0046]

[0047] The following is a detailed description of the synthesis and application of polyurethane conformal coatings.

[0048] Phosphor: Ciba OB phosphor

[0049] Cobalt naphthenate: Shanghai Huanqi Chemical Co., Ltd., cobalt naphthe...

Embodiment 13-18

[0072] The preparation method is the same as before.

[0073]

[0074]

[0075] For the polyurethane conformal paint prepared above, by testing the substrate adhesion and storage stability, it can be seen that the best adhesion and storage stability are obtained with a mass ratio of 1:1-1:3. is 1:1.

[0076]

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Abstract

The invention relates to a polyurethane three-proofing coating which is blended from the following components according to weight percentage: 80-90 polyurethane modified alkyd resin, 3-4 cobalt drier, 6-7 zirconiumdrier, 3-9 calcium drier, 0.7-1.2 methyl ethyl ketoxime, and 0.15-0.30 fluorescent powder, wherein the polyurethane modified alkyd resin is blended from the following components according to weight percentage: 45-55 alkyd resin, 2-6polyisocyanates, 4-8 micromoleculepolyhydric alcohols, 2-4 micromolecule mono-alcohol, and 40-50 solvent. The polyurethane three-proofing coating does not contain aromatic hydrocarbon solvents or lead matters, and meets the environmental requirement of RoHS (restriction of hazardous substances) of the European Union.

Description

technical field [0001] The invention relates to polyurethane conformal paint. technical background [0002] With the development of the economy, the application of conformal coatings is becoming more and more extensive. Now there are four types of conformal coatings in China: epoxy resin conformal coatings, silicone conformal coatings, acrylic conformal coatings and polyurethane conformal coatings. Among them, polyurethane conformal paint is more and more used in printed circuit boards (PCB), Electrical equipment, semiconductors, sensors, transducers, and hybrid circuits. In the era when the society vigorously advocates environmental protection, people have higher and higher requirements for environmental protection of products. At present, in the mainstream market, most polyurethane conformal coating systems contain aromatic solvents or lead-containing substances, which are harmful to the human body, thus limiting the application of polyurethane conformal coatings. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/06C09D7/12C08G18/73C08G18/42C08G18/32
Inventor 余洪桂刘婷程峰吴芝锭张海龙贾梦虹任天斌
Owner YIYUAN ELECTRONICS TECH
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