UV-cured hard coating and preparation method thereof

A technology of hard coating and diallyl bisphenol, which is applied in the field of UV curing hard coating and its preparation, can solve the problems of cumbersome preparation process and many side reactions of polyurethane acrylate, and achieve simple preparation method and high reaction rate The effect of low temperature and solving the complicated preparation process

Inactive Publication Date: 2022-01-28
HEFEI UNIV OF TECH
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Problems solved by technology

[0005] In view of the above-mentioned defects of the prior art, the purpose of the present invention is to propose a UV curing hard coating and preparation method thereof, to solve the problem of the polyurethane acrylic acid based on hyperbranched polyester as the main body in the existing UV curing hard coating. The ester preparation process is cumbersome and has many side reactions

Method used

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  • UV-cured hard coating and preparation method thereof
  • UV-cured hard coating and preparation method thereof
  • UV-cured hard coating and preparation method thereof

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preparation example Construction

[0045] On the other hand, the present invention also provides a kind of preparation method of cured hard coating, comprises the steps:

[0046] S1 Diallyl bisphenol A monomer and diacid chloride monomer synthesize diallyl bisphenol A-diacid chloride copolyester;

[0047] S2 diallyl bisphenol A-diacyl chloride copolyester is mixed with a photoinitiator to obtain a UV curing hard coating solution;

[0048] S3 UV curable hard coating solution is cured by UV light to obtain UV curable hard coating.

[0049] In a specific embodiment, step S1 specifically includes, for example:

[0050] S11 Add solvent A and acid binding agent to diallyl bisphenol A monomer to form a solution of diallyl bisphenol A;

[0051] S12 Dissolve the diacid chloride monomer in solvent A, and add it to the solution of diallyl bisphenol A under the protection of nitrogen to carry out condensation reaction, and then add an end-capping agent to carry out end-capping reaction;

[0052] S13 is centrifuged to re...

Embodiment 1

[0064] A UV curing hard coating, the preparation method is as follows:

[0065] (1) Preparation of diallyl bisphenol A-isophthaloyl chloride copolyester

[0066] Weigh 15.42g (0.05mol) of diallyl bisphenol A in a 250mL two-necked flask equipped with a constant pressure funnel and a magnetic stirrer, then add 40mL of tetrahydrofuran to dissolve it, then add 12.14g (0.12mol) ) triethylamine; 12.18g (0.06mol) of isophthaloyl chloride was added to a constant pressure funnel, and 12mL of tetrahydrofuran was added to dilute it, and then the contents of the two-necked flask were mixed uniformly and placed in a water bath at 25°C in the pot. Then slowly drop the isophthaloyl dichloride solution in the constant pressure funnel into the two-necked flask for about 1 hour; after 2.5 hours of reaction, raise the temperature of the system to 45°C, continue the reaction at 45°C for 4 hours, and then add 2.86g (0.022mol) of hydroxyethyl methacrylate and continue to react for 4h. After the ...

Embodiment 2

[0070] A UV curing hard coating, the preparation method is as follows:

[0071] (1) Preparation of diallyl bisphenol A-fumaryl chloride copolyester

[0072] Weigh 15.42g (0.05mol) of diallyl bisphenol A in a 250mL two-necked flask equipped with a constant pressure funnel and a magnetic stirrer, then add 40mL of tetrahydrofuran to dissolve it, then add 12.14g (0.12mol) ) triethylamine; 9.18g (0.06mol) of fumaryl chloride was added to the constant pressure funnel, and 12mL of tetrahydrofuran was added to dilute it, then the contents of the two-necked flask were mixed uniformly and placed in a water bath at 25°C . Then slowly drop the fumaryl chloride solution in the constant pressure funnel into the two-necked flask for about 1 hour; after 2.5 hours of reaction, raise the temperature of the system to 45°C, continue the reaction at 45°C for 4 hours, and then add 2.86g (0.022mol) of hydroxyethyl methacrylate and continued to react for 4h. After the reaction was completed, the t...

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Abstract

The invention provides a UV-cured hard coating and a preparation method thereof. The UV-cured hard coating is obtained by synthesizing diallyl bisphenol A-diacyl chloride copolyester through a diallyl bisphenol A monomer and a diacyl chloride monomer, then mixing the diallyl bisphenol A-diacyl chloride copolyester with a photoinitiator and carrying out UV photocuring. According to the invention, a diallyl bisphenol A molecule structure contains two allyl double bonds, two benzene rings and two hydroxyl groups, wherein the allyl double bonds can be used for UV curing, and the benzene ring structure can greatly improve the hardness of the coating; the molecular structure of diacyl chloride contains a flexible carbon chain and two acyl chloride groups, wherein the flexible carbon chain can improve the toughness of the coating, and the high-activity acyl chloride groups can be subjected to condensation polymerization at low temperature, so that gel caused by double-bond polymerization due to high temperature is avoided; an end-capping reagent can remove acyl chloride groups at the tail end of a molecular chain of the diallyl bisphenol A-diacyl chloride copolymerized unsaturated polyester, and the crosslinking degree is further improved; and the pencil hardness of the coating can reach 4H.

Description

technical field [0001] The invention belongs to the technical field of photocurable coatings, in particular to a UV curable hard coating and a preparation method thereof. Background technique [0002] Plastic has the advantages of light weight, easy processing, and low cost. It is an indispensable material for the manufacture of daily necessities and special-purpose high-tech products, such as optical glass, electronic product casings, or protective films for precision instruments. However, due to its low hardness and poor scratch resistance, its application fields are limited. The most simple, effective and economical way to solve this problem is to attach a layer of high hardness coating on its surface. [0003] Compared with thermal curing, UV curing technology has five advantages of high efficiency, energy saving, empowerment, economy and environmental protection, so it has been widely used in the coating field. [0004] Existing UV-curable hard coatings are often base...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D167/06C08G63/547C08G63/78
CPCC09D167/06C08G63/547C08G63/78C08G2150/00
Inventor 周正发冯才兴李盟马海红任凤梅徐卫兵
Owner HEFEI UNIV OF TECH
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