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UV-heat dual-curing polyurethane coating, and preparation method and application thereof

A polyurethane coating and dual-curing technology, which is applied in polyurea/polyurethane coatings, coatings, and devices for coating liquid on the surface, etc., can solve the problem of high coating stress, lack of substrate penetration of UV-cured coatings, and stable surface tension of materials Poor resistance and other problems, to achieve the effect of improved adhesion

Active Publication Date: 2014-10-15
HUBEI INST OF AEROSPACE CHEMOTECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (2) UV curable coatings (inks) lack penetration to the substrate
[0006] (3) The stress of UV coating (ink) is large during the curing process
[0007] The commonly used corona treatment method in industrialization can improve the adaptability of PET film, but the surface tension stability of the corona treated material is poor; the primer treatment is not affected by temperature and humidity changes, so it is more suitable for product line production

Method used

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  • UV-heat dual-curing polyurethane coating, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] This example illustrates the raw material and mass percent of UV-heat dual-curing coating of the present invention:

[0051] Hexafunctional polyurethane acrylate (product of Sartomer, USA, brand name CN9010NS) 7.8%

[0052] Difunctional polyurethane acrylate (product of Sartomer, USA, brand name CN983NS) 4.1%

[0053] Pentaerythritol tetraacrylate (product of Sartomer, USA, brand SR295) 2.6%

[0054] Polyacrylate polyol (product of DIC, brand WDU-938) 27.7%

[0055] Polyester polyol (product of Bayer, brand RD181X) 3.2%

[0056] HDI trimer (product of Bayer, brand N3600) 4.0%

[0057] Irgacure 184 (produced by Huatai, Changzhou, Jiangsu) 0.6%

[0058] Auxiliary (mixture of organic solvent and leveling agent) 50%

[0059] Among them, organic solvent 40%, methyl ethyl ketone: toluene = 1:1; leveling agent 10%, BYK company, brand BYK-361N.

[0060] Divide the additive into two parts, and the ratio is not limited. Add hexafunctional urethane acrylate, difunctional ur...

Embodiment 2

[0120] This example illustrates the advantages of using the UV-heat dual-cure coating of the present invention as a base coat and using the coating process mentioned in the present invention.

[0121] Coat the UV-heat dual-curing coating of the present invention on a 100 μm corona-treated polyethylene terephthalate (PET) film, and dry the wet coating film with hot air. The temperature of the hot air is designed in a gradient form, that is, to coat The cloth base material passes through three temperature zones of medium temperature (60-90°C), high temperature (90-150°C) and medium temperature (60-90°C) in sequence. The hot air drying time is about 1min, and it is wound up, and then coated on the surface of the coating. Coat a layer of functional UV-curable coating (self-made urethane acrylate system), dry the coated substrate through high temperature (90-150°C) heat separation for about 1min, and then pass through 250mJ / cm 2 The curing time is about 11 s under the ultraviolet l...

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Abstract

The invention provides an UV-heat dual-curing polyurethane coating, and a preparation method and application thereof. The UV-heat dual-curing polyurethane coating is composed of an UV curing system and a heat curing system. The UV curing system comprises, by weight, 40%-70% of a prepolymer, 10%-30% of an active monomer and 1%-10% of a photoinitiator. The heat curing system comprises, by weight, 50%-80% of an adhesive and 20%-50% of a cross-linking agent. The coating disclosed by the invention solves the problem that the adhesive property of the functional coating with a PET membrane is bad. Compared with the prior art, the used UV curing system and the heat curing system are both a polyurethane system, the kinds of the polyurethane system are various, the comprehensive performances are relatively good than those of other systems and the various polyurethane systems are capable of satisfying many performances of an optical film, and also the UV curing system and the heat curing system are relatively good in compatibility and can form an interpenetrating network structure. The coating has good adhesive force on the PET membrane and is high in hardness and transparency.

Description

Technical field [0001] The invention relates to a coating containing UV curing and thermal curing methods, which can be used as a base coat for plastic substrates. Background technique [0002] PET (polyethylene terephthalate) film has excellent properties such as high temperature resistance, durability, chemical corrosion resistance and high transparency, while ultraviolet light curing (UV curing) coatings (inks) have excellent wear resistance Excellent properties such as performance, weather resistance, chemical resistance, high gloss and high hardness. Therefore, in the preparation process of LCD products, PET film is often used as the base material, and functional coatings are coated on it to prepare various optical films with high added value. However, UV curable coatings (inks) often fail to form an effective bond with the PET film, causing peeling and affecting product quality. Therefore, whether a good bond can be formed between the coating and the substrate is a cr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/14C09D175/04C09D175/06C09D7/12B05D3/02B05D3/06B05D1/38C08J7/04
Inventor 袁东芝杨柱邓康清夏萍常征刘振宇张宏元
Owner HUBEI INST OF AEROSPACE CHEMOTECHNOLOGY
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