阅读说明：本技术 应用在pmma底材上的高硬度水性高光uv清漆及其制备方法 (High-hardness water-based high-gloss UV varnish applied to PMMA substrate and preparation method thereof ) 是由 陈威斌 周一帆 杨武 黎冠达 李云科 李艺龙 于 2021-09-02 设计创作，主要内容包括：本发明公开了一种应用在PMMA底材上的高硬度水性高光UV清漆及其制备方法,高管能度UV乳液提供高硬度和高耐磨性能,低官能度UV乳液提供柔韧性、基材流平、润湿性能,可以直接涂装在热弯成型后的PMMA基材上,具有高光泽、高丰满度、高硬度、超耐磨的特点,漆膜高光丰满、透明平整、高硬度、高耐磨性能,同时具有良好的抗沾污、耐化妆品、耐人工汗等性能,可以满足手机外壳产品的性能要求。(The invention discloses a high-hardness water-based high-gloss UV varnish applied to a PMMA substrate and a preparation method thereof, wherein a high-pipe-energy UV emulsion provides high hardness and high wear resistance, a low-functionality UV emulsion provides flexibility, substrate leveling property and wetting property, the high-hardness water-based high-gloss UV varnish can be directly coated on a hot-bending formed PMMA substrate, has the characteristics of high gloss, high fullness, high hardness and super wear resistance, has high-gloss fullness, transparency, smoothness, high hardness and high wear resistance of a paint film, has good performances of stain resistance, cosmetics resistance, artificial sweat resistance and the like, and can meet the performance requirements of mobile phone shell products.)

1. The high-hardness water-based high-gloss UV varnish applied to the PMMA substrate is characterized by comprising the following components in percentage by weight:

6 functionality waterborne aliphatic acrylic modified polyurethane dispersion: 65-70 percent

2 functionality aqueous polyurethane dispersion: 20 to 25 percent

Photoinitiator (2): 1.8 to 2.2 percent

0.3 to 0.5 percent of organosilicon wetting agent

Organic silicon flatting agent: 0.3 to 0.5 percent

Deionized water: 4 to 6 percent

Polyurethane thickener: 0.3 to 0.6 percent.

2. High hardness aqueous high gloss UV varnish for PMMA substrates, according to claim 1,

the 6-functionality waterborne aliphatic acrylic modified polyurethane dispersion is DRW-450, the 2-functionality waterborne polyurethane dispersion is DRW-6166, and the photoinitiator is BP: 1173 ═ 1: 1, the organic silicon wetting agent is Tego4100, the organic silicon leveling agent is BYK333, and the polyurethane thickener is PUR 60.

3. High-hardness aqueous high-gloss UV varnish for PMMA substrates, according to claim 2, characterised in that it comprises, in percentages by weight:

6 functionality waterborne aliphatic acrylic modified polyurethane dispersion DRW-450: 68 percent;

2 functionality aqueous polyurethane dispersion DRW-6166: 22 percent;

BP: 1173 ═ 1: 1 photoinitiator: 2 percent;

silicone wetting agent Tego 4100: 0.5 percent

An organic silicon flatting agent BYK 333: 0.5 percent

Deionized water: 5.9 percent

Polyurethane thickener PUR 60: 0.6 percent.

4. The process for preparing a high hardness aqueous high gloss UV varnish for PMMA substrates as claimed in claim 1, characterized by the following steps:

s1, adding the functionality aqueous polyurethane dispersion into the 6 functionality aqueous aliphatic acrylic acid modified polyurethane dispersion by stirring;

s2, adding a photoinitiator which is uniformly mixed in advance to form a homogeneous liquid state into the mixture during stirring;

s3, adding a leveling agent and a wetting agent during stirring;

s4, adding ionized water during stirring;

s5, adding a thickening agent while stirring, and adjusting the viscosity to 75-85 KU.

Technical Field

The invention relates to a preparation method of high-hardness water-based high-gloss UV varnish applied to a PMMA substrate.

Background

The water-based paint has low VOC, can reduce the pollution to construction environment and surrounding environment in the coating process, is diluted by water in the using process, does not use dangerous goods, greatly improves the safety of the coating environment, and is environment-friendly.

At present, most of mobile phone back covers are formed by hot bending of PMMA, a layer of high-performance coating needs to be coated on a base material for protection after forming, and the existing water-based paint can not be directly coated on the PMMA base material after hot bending forming.

Disclosure of Invention

The invention aims to overcome the defect that the water-based paint in the prior art can not be directly coated on a hot-bending formed PMMA substrate generally, and provides a preparation method of high-hardness water-based high-gloss UV varnish applied to a PMMA substrate.

In order to solve the technical problems, the invention provides the following technical scheme:

the invention uses the high-functionality aqueous aliphatic polyurethane polyacrylate dispersoid as a film forming main body, matches part of the low-functionality aqueous aliphatic polyurethane acrylate dispersoid, a photoinitiator, a wetting agent, a surface leveling agent, a thickening agent, water and the like. The high pipe energy UV emulsion provides high hardness, high abrasion resistance, and the low functionality UV emulsion provides flexibility, substrate leveling, and wetting properties. The paint film is high in gloss, plumpy, transparent, flat, high in hardness and high in wear resistance. Meanwhile, the paint has good performances of stain resistance, cosmetics resistance, artificial sweat resistance and the like. Can meet the performance requirements of mobile phone shell products.

The formula of the invention comprises the following components in percentage by weight:

6 functionality waterborne aliphatic acrylic modified polyurethane dispersion: 65-70 percent

2 functionality aqueous polyurethane dispersion: 20 to 25 percent

Photoinitiator (2): 1.8 to 2.2 percent

0.3 to 0.5 percent of organosilicon wetting agent

Organic silicon flatting agent: 0.3 to 0.5 percent

Deionized water: 4 to 6 percent

Polyurethane thickener: 0.3 to 0.6 percent

The preferable 6-functionality waterborne aliphatic acrylic modified polyurethane dispersion is DRW-450, the 2-functionality waterborne polyurethane dispersion is DRW-6166, and the photoinitiator is BP: 1173 ═ 1: 1, the organic silicon wetting agent is Tego4100, the organic silicon leveling agent is BYK333, and the polyurethane thickener is PUR 60.

The preparation method comprises the following steps:

s1, adding the functionality aqueous polyurethane dispersion into the 6 functionality aqueous aliphatic acrylic acid modified polyurethane dispersion by stirring;

s2, adding a photoinitiator which is uniformly mixed in advance to form a homogeneous liquid state into the mixture during stirring;

s3, adding a leveling agent and a wetting agent during stirring;

s4, adding ionized water during stirring;

s5, adding a thickening agent while stirring, and adjusting the viscosity to 75-85 KU.

The invention has the following beneficial effects:

the invention develops a water-based UV varnish aiming at a PMMA substrate, can be directly coated on the PMMA substrate after hot bending forming, and has the characteristics of high gloss, high fullness, high hardness and super wear resistance. Can replace the prior solvent type products of the same type and realize environment-friendly coating.

Detailed Description

The following description of the preferred embodiments of the present invention is provided for the purpose of illustration and description, and is in no way intended to limit the invention.

Examples

A preparation method of high-hardness water-based high-gloss UV varnish applied to a PMMA substrate comprises the following steps:

the formula comprises the following components in percentage by weight:

6 functionality waterborne aliphatic acrylic modified polyurethane dispersion DRW-450: 68 percent;

2 functionality aqueous polyurethane dispersion DRW-6166: 22 percent;

BP: 1173 ═ 1: 1 photoinitiator: 2 percent;

silicone wetting agent Tego 4100: 0.5 percent

An organic silicon flatting agent BYK 333: 0.5 percent

Deionized water: 5.9 percent

Polyurethane thickener PUR 60: 0.6 percent.

The preparation method comprises the following steps:

s1, adding the DRW-6166 into the DRW-450 with stirring;

s2, adding a photoinitiator which is uniformly mixed in advance to form a homogeneous liquid state into the mixture during stirring;

s3, adding a leveling agent and a wetting agent during stirring;

s4, adding ionized water during stirring;

s5, adding a thickening agent while stirring, and adjusting the viscosity to 75-85 KU.

The obtained water-based high-gloss UV varnish is subjected to performance test, and the test results are shown as follows:

finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.