A high-efficiency and environment-friendly UV-moisture dual-cure conformal paint for flexible circuit boards

A flexible circuit board, environmentally friendly technology, applied in anti-corrosion coatings, fire-resistant coatings, coatings, etc., can solve the problems of non-drying of the shadow area of ​​the circuit board, induction of occupational diseases, delamination, etc.

Active Publication Date: 2020-10-27
YIK SHING TAT INDUSTRIALCO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ultraviolet light is a necessary condition for UV curing, and it is easy to cause the phenomenon that the shadow area of ​​the circuit board is not dry.
[0004] At present, the conformal paint applied to rigid circuit boards in the market is relatively mature, but there are still big problems in applying to flexible circuit boards. The key is that when flexible circuit boards are bent at high frequency and high strength, if the conformal paint cannot When the requirements of flexibility and adhesion are met, it is easy to cause cracking and delamination.
On the other hand, there are few conformal paint products for flexible circuit boards, and they are solvent-based conformal paints. Because they contain organic solvents such as benzene, they have the danger of combustion and explosion, and are harmful to human health. Long-term exposure can induce occupational diseases.

Method used

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  • A high-efficiency and environment-friendly UV-moisture dual-cure conformal paint for flexible circuit boards
  • A high-efficiency and environment-friendly UV-moisture dual-cure conformal paint for flexible circuit boards
  • A high-efficiency and environment-friendly UV-moisture dual-cure conformal paint for flexible circuit boards

Examples

Experimental program
Comparison scheme
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preparation example Construction

[0029] In the present invention, monomers containing C=C double bonds and -NHCOO- can be purchased from the market, for example, can be selected from ethyl [2-(vinylthio) ethyl] carbamate, ethyl ( 2-methyl-4-penten-1-yl) carbamate, naphthalene-1-yl N-prop-2-enyl carbamate, 2-methyl-2-propyl[(4E) One of -6-oxo-1,4-hexadien-3-yl] carbamate, etc. It can also be prepared by reacting diisocyanate, polyol, and hydroxyalkyl acrylate as raw materials under a solvent and a catalyst. The specific preparation method includes the following steps:

[0030] Take a certain amount of diisocyanate, hydroxyalkyl acrylate (such as hydroxyethyl (meth)acrylate) and ethylene glycol, add to the reaction kettle, in the presence of a solvent (such as acetone) and a catalyst (such as dibutyltin dilaurate) 60 ° C reflux reaction for 3 hours that is.

[0031] In the present invention, polyurethane modified acrylic resin is adopted, and isocyanate reacts with moisture in the air to realize dark curing w...

Embodiment 1

[0054] Embodiment 1 provides a high-efficiency and environment-friendly UV-moisture dual-curing conformal coating for flexible circuit boards, and the preparation raw materials of the conformal coating, in parts by weight, include:

[0055]

[0056] The modified acrylic resin is a polyurethane modified acrylic resin, and its preparation method includes the following steps:

[0057] 0.1mol acrylic acid, 0.1mol ethyl(2-methyl-4-penten-1-yl)carbamate (CAS: 112476-23-0), 0.02mol N-prop-2-enylbenzyl The amide (CAS: 10283-95-1) was added to 100 mL of acetone, stirred and mixed, heated to 60° C., then 2.7 g of potassium persulfate was added, and the reaction was continued for 2 hours under reflux, and then cooled and discharged.

[0058] The active diluent is 8-hydroxyoctyl acrylate; the leveling aid is leveling aid A; the defoaming agent is polyoxyethylene polyoxypropylene pentaerythritol ether; the wetting agent is diethylene glycol ; the flame retardant is tris(2,3-dibromoprop...

Embodiment 2

[0063] Embodiment 2 provides a high-efficiency and environment-friendly UV-moisture dual-curing conformal coating for flexible circuit boards, and the preparation raw materials of the conformal coating, in parts by weight, include:

[0064]

[0065] The modified acrylic resin is a polyurethane modified acrylic resin, and its preparation method includes the following steps:

[0066] 0.1mol acrylic acid, 0.1mol ethyl(2-methyl-4-penten-1-yl)carbamate (CAS: 112476-23-0), 0.02mol N-prop-2-enylbenzyl The amide (CAS: 10283-95-1) was added to 100 mL of acetone, stirred and mixed, heated to 60° C., then 2.7 g of potassium persulfate was added, and the reaction was continued for 2 hours under reflux, and then cooled and discharged.

[0067] The active diluent is 8-hydroxyoctyl acrylate; the leveling aid is leveling aid A; the defoaming agent is polyoxyethylene polyoxypropylene pentaerythritol ether; the wetting agent is diethylene glycol ; the flame retardant is tris(2,3-dibromoprop...

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PUM

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Abstract

The invention relates to the technical field of flexible circuit board protection, and particularly relates to high-efficiency environment-friendly ultraviolet (UV)-moisture double-cured three-proofing paint for a flexible circuit board. The three-proofing paint is prepared from the following raw materials in parts by weight: 30-70 parts of modified acrylic resin, 30-70 parts of a reactive diluents, 1-10 parts of an initiator, 0.1-8 parts of a leveling aid, 0.1-5 parts of a defoaming agent, 0.1-5 parts of a wetting agent and 0.1-6 parts of a flame retardant.

Description

technical field [0001] The invention relates to the technical field of flexible circuit board protection, in particular to a high-efficiency and environment-friendly UV-moisture double-curing conformal paint for flexible circuit boards. Background technique [0002] With the rapid development of the electronics industry, electronic products tend to be high-density, miniaturized, and highly reliable. Compared with rigid circuit boards, flexible circuit boards made of polyimide or polyester film can be bent, wound, and folded freely, and can withstand millions of dynamic bendings without damaging the wires. The layout requires arbitrary arrangement, and arbitrary movement and expansion in three-dimensional space, so as to achieve the integration of component assembly and wire connection. In practical applications, flexible circuit boards are in a complex environment and are easily affected by factors such as moisture, mold, salt spray, high dust, vibration, and corrosive gase...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D4/02C09D4/06C09D5/08C08F220/06C08F226/02
CPCC08F220/06C08F226/02C09D4/06C09D5/08C09D5/18
Inventor 吴建新张彩绵石学堂
Owner YIK SHING TAT INDUSTRIALCO LTD
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