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Hybrid urethane acrylate UV coating with high surface hardness

A urethane acrylate, high surface technology, applied in the field of hybrid urethane acrylate UV coatings and hybrid urethane acrylate resin UV coatings, can solve the problems of coating defects, difficult dispersion, system instability, etc., and achieve good compatibility performance and stability, improving hardness and wear resistance, and stabilizing system composition

Active Publication Date: 2021-01-05
JIANGSU LITIAN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First, the filler system generally has a larger particle size, and its density is higher than that of the photocurable resin, which leads to rapid sedimentation of the inorganic particles in the resin system. It is not suitable to increase the hardness and wear resistance of the photocurable coating by directly adding fillers; Second, theoretically, the sedimentation rate of nano-inorganic fillers in the photocurable resin system is negligible, but due to the extremely high surface energy of the nanoparticles, it is difficult to disperse in the resin system, causing the particles to form aggregates, which leads to The system is unstable; thirdly, generally speaking, it is necessary to add a large amount of inorganic components to the photocurable resin system to obtain a photocurable coating with better hardness and wear resistance, which usually leads to an increase in the viscosity of the system and the presence of inorganic fillers in the system. Phase separation in the center leading to coating defects and reduced coating adhesion

Method used

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  • Hybrid urethane acrylate UV coating with high surface hardness
  • Hybrid urethane acrylate UV coating with high surface hardness
  • Hybrid urethane acrylate UV coating with high surface hardness

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] In this example, modified silica nanoparticles are prepared by the nano-dispersion method, and dispersed into the polyurethane acrylate system to obtain a hybrid polyurethane acrylate UV coating. The hybrid polyurethane acrylate UV coating consists of the following components in weight percentage :

[0052]

[0053] Wherein, the sum of urethane acrylate oligomer, modified silica particles and reactive diluent is 100%, and the amount of photoinitiator and auxiliary agent is based on urethane acrylate oligomer, modified silica particle and reactive diluent The total amount of the agent is added as the basis.

[0054] Described polyurethane acrylate oligomer molecular weight is 1282, is made by the following method:

[0055] In a 1000mL four-necked flask, 500 grams of polycaprolactone diol (Perstorp CAPA2100, molecular weight 1000), 141 grams (1mol) of isocyanate ethyl acrylate, 0.1 gram of catalyst dibutyltin dilaurate, and polymerization inhibitor p-hydroxybenzene 0...

Embodiment 2

[0065] On the basis of the hybrid polyurethane acrylate UV coating in Example 1, the content of the inorganic component modified silica was increased to 20 wt%. The formula is as follows:

[0066]

[0067] Urethane acrylate oligomer, modified silicon dioxide, reactive diluent, photoinitiator, auxiliary agent are all the same as in Example 1.

Embodiment 3

[0069] Dispersing modified silica nanoparticles into a resin and reactive diluent system involves separation and redispersion of the nanoparticles, increasing operating costs and the risk of particle agglomeration upon dispersion. In general, re-dispersion of colloidal systems after destabilization faces great challenges.

[0070] In this example, the in-situ sol-gel method was adopted to obtain a uniformly dispersed hybrid urethane acrylate oligomer, and then the hybrid urethane acrylate oligomer was mixed with reactive diluents and additives, A photoinitiator was previously added to obtain a hybrid urethane acrylate UV coating. Hybrid polyurethane acrylate UV coating consists of the following components by weight percentage:

[0071]

[0072] Reactive diluent, photoinitiator, auxiliary agent are all identical with embodiment 1.

[0073] The preparation method of hybrid polyurethane acrylate oligomer is as follows:

[0074] 25g tetraethyl orthosilicate is dispersed in t...

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Abstract

The invention discloses a hybrid urethane acrylate UV coating with high surface hardness. The hybrid urethane acrylate UV coating is prepared from the following components: a urethane acrylate oligomer, modified silicon dioxide, a reactive diluent, a photoinitiator, an auxiliary agent or a hybrid urethane acrylate oligomer, a reactive diluent, a photoinitiator and an auxiliary agent, wherein the hybrid urethane acrylate oligomer is an in-situ hydrolysis polymerization product prepared from a silicon dioxide precursor in a urethane acrylate oligomer system by adopting an in-situ sol-gel method.The transparent silicon dioxide nanoparticles are prepared and modified to be matched with an ultraviolet curing resin system, so that the compatibility of the silicon dioxide nanoparticles and the light curing resin system is improved; and the hybrid urethane acrylate UV coating provided by the invention has low viscosity and low inorganic component addition amount, and the prepared coating hasexcellent hardness and wear resistance, and has great value in application in furniture fields such as floors and other wear-resistant fields.

Description

technical field [0001] The invention belongs to the field of photocurable resins and coatings, and relates to a hybrid polyurethane acrylate UV coating with high surface hardness, in particular to a hybrid polyurethane acrylate UV coating with high surface hardness prepared by using modified silica nanoparticles and photocurable polyurethane acrylate resin. Polyurethane acrylate resin UV coating. Background technique [0002] UV-curable coatings have the characteristics of 5E and are environmentally friendly and efficient coatings. In recent years, UV-curable coatings have been widely used in the fields of packaging, furniture, electronics and automotive coatings. Traditional photocurable resins are mainly obtained by grafting reaction of photocurable acrylate groups with polyurethane and epoxy resins. Photocurable resins are mainly composed of organic components, resulting in low hardness and wear resistance after coating, which hinders the application of photocurable res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/14C09D7/62
CPCC09D175/14C09D7/62C08K9/06C08K3/36
Inventor 孙冠卿张丽丽胡剑飞马怀祥
Owner JIANGSU LITIAN TECH