阅读说明：本技术 一种增强柔性玻璃基材表面附着力的预涂液及其应用方法 (Pre-coating liquid for enhancing surface adhesion of flexible glass substrate and application method thereof ) 是由 曾金栋 陆留斌 林海 于 2019-10-15 设计创作，主要内容包括：本发明属于柔性玻璃技术领域,具体涉及一种增强柔性玻璃基材表面附着力的预涂液及其应用方法,预涂液由如下重量份的各组分组成：多羟基聚合物10-90份、硅烷偶联剂0-20份、无机溶胶10-90份、溶剂500-2000份。本发明中的多羟基聚合物和无机溶胶中都含有大量羟基,可以与柔性玻璃基材之间形成牢固的氢键,固化后,预涂层表面仍然能够保留一定数量的羟基,有助于增加预涂层与UV硬化层之间的附着力,从而提高UV硬化层与柔性玻璃基材之间的结合力,有效提高柔性玻璃硬化膜的综合形成,延长使用寿命；在柔性玻璃基材与UV硬化层之间增加预涂层,可在保证总的涂层厚度前提下减小UV硬化层厚度,不仅能有效避免UV硬化层过厚而容易开裂的问题,还可以达到保护和防飞溅效果。(The invention belongs to the technical field of flexible glass, and particularly relates to a pre-coating liquid for enhancing the surface adhesion of a flexible glass substrate and an application method thereof, wherein the pre-coating liquid comprises the following components in parts by weight: 10-90 parts of polyhydroxy polymer, 0-20 parts of silane coupling agent, 10-90 parts of inorganic sol and 2000 parts of solvent. The polyhydroxy polymer and the inorganic sol both contain a large amount of hydroxyl groups, so that firm hydrogen bonds can be formed between the polyhydroxy polymer and the flexible glass substrate, and after the polyhydroxy polymer and the inorganic sol are cured, a certain amount of hydroxyl groups can still be reserved on the surface of the precoating layer, which is beneficial to increasing the adhesive force between the precoating layer and the UV hardened layer, so that the binding force between the UV hardened layer and the flexible glass substrate is improved, the comprehensive formation of a flexible glass hardened film is effectively improved, and the service life is prolonged; increase the precoat between flexible glass substrate and UV sclerosis layer, can reduce UV sclerosis layer thickness under the prerequisite of guaranteeing total coating thickness, can not only effectively avoid UV sclerosis layer too thick and the problem of easy fracture, can also reach the protection and prevent the effect of splashing.)

1. The precoating liquid for enhancing the surface adhesion of the flexible glass substrate is characterized by comprising the following components in parts by weight: the composition comprises the following components in parts by weight:

10-90 parts of polyhydroxy polymer

0-20 parts of silane coupling agent

10-90 parts of inorganic sol

Solvent 500-2000 parts.

2. The pre-coating solution for enhancing the surface adhesion of a flexible glass substrate according to claim 1, wherein: the polyhydroxy polymer is one or more of cellulose, starch, polyvinyl alcohol and polyvinyl formal.

3. The pre-coating solution for enhancing the surface adhesion of a flexible glass substrate according to claim 1, wherein: the silane coupling agent is one or more of a silane coupling agent with an epoxy group, a silane coupling agent with an amino group and a silane coupling agent with a double bond.

4. The pre-coating solution for enhancing the surface adhesion of a flexible glass substrate according to claim 3, wherein: the silane coupling agent is one or more of gamma-glycidoxypropyltrimethoxysilane, aminopropyltrimethoxysilane and gamma-methacryloxypropyltrimethoxysilane.

5. The pre-coating solution for enhancing the surface adhesion of a flexible glass substrate according to claim 1, wherein: the inorganic sol is one or two of silica sol and aluminum sol; the particle size of the inorganic sol is 2-50 nm.

6. The pre-coating solution for enhancing the surface adhesion of a flexible glass substrate according to claim 1, wherein: the solvent is alcohol, water or alcohol-water mixture.

7. The pre-coating solution for enhancing the surface adhesion of a flexible glass substrate according to any one of claims 1 to 6, wherein: the preparation method comprises the following steps: weighing the components in proportion, adding the polyhydroxy polymer, the silane coupling agent and the inorganic sol into a solvent, heating to 40-90 ℃, and uniformly stirring to obtain the pre-coating liquid.

8. The method of using the precoating liquid for enhancing the surface adhesion of a flexible glass substrate according to claim 7, wherein: the method comprises the following steps:

(1) uniformly coating the pre-coating liquid on flexible glass, and performing heat curing to obtain a pre-coating layer;

(2) and uniformly coating a layer of UV hardening liquid on the surface of the precoating layer, curing to obtain a UV hardening layer, and attaching a protective film after the UV hardening layer is cooled.

9. The method of applying the pre-coating solution for enhancing the surface adhesion of a flexible glass substrate according to claim 8, wherein: the thermosetting temperature in the step (1) is 80-200 ℃, and the time is 1-30 min.

10. The method of applying the pre-coating solution for enhancing the surface adhesion of a flexible glass substrate according to claim 8, wherein: the thickness of the precoat layer is 0.5-35 μm, and the thickness of the UV hardening layer is 2-35 μm.

Technical Field

The invention belongs to the technical field of flexible glass, and particularly relates to a pre-coating liquid for enhancing the surface adhesion of a flexible glass substrate and an application method thereof.

Background

In recent years, with the vigorous development of the electronic information industry and the raw material industry thereof, flexible and foldable mobile phones and other flexible electronic devices become the key point of research and development in the industry. This requires that the cover glass can be folded, the thickness of the glass must be reduced to less than 100 μm, and the glass becomes flexible glass with good flexibility, and such thin flexible glass is hard to withstand external impact, is fragile and easy to splash, and therefore, must be effectively protected.

The existing protection method is to coat a layer of hardened coating on the surface of flexible glass to obtain a hardened film of the flexible glass, and the thickness of the hardened coating is generally required to be more than 20-35 mu m in order to achieve the effects of protection and splash prevention. However, the UV-hardening coating generally used for mobile phone screen protection is difficult to adhere to glass, and the larger the coating thickness is, the more easily the UV-hardening coating is cracked, so that the UV-hardening coating cannot be better applied to flexible glass. The traditional thermosetting coating has the problems of long curing time, energy waste and the like. Therefore, there is a need to develop a pre-coating liquid that improves the adhesion between the flexible glass and the UV-hardening coating so that the UV-hardening coating can be better applied to the protection and splash prevention of the flexible glass.

Disclosure of Invention

The invention discloses a precoating liquid for enhancing the surface adhesion of a flexible glass substrate and an application method thereof, aiming at solving the problem that the adhesion of a UV hardened layer on the surface of the flexible glass substrate is poor.

In order to achieve the purpose, the invention adopts the following technical scheme:

the precoating liquid for enhancing the surface adhesion of the flexible glass substrate comprises the following components in parts by weight:

preferably, the polyhydroxy polymer is one or more of cellulose, starch, polyvinyl alcohol and polyvinyl formal.

Preferably, the silane coupling agent is one or more of a silane coupling agent having an epoxy group, a silane coupling agent having an amino group, and a silane coupling agent having a double bond.

Preferably, the silane coupling agent is one or more of gamma-glycidoxypropyltrimethoxysilane, aminopropyltrimethoxysilane and gamma-methacryloxypropyltrimethoxysilane.

Preferably, the inorganic sol is one or two of silica sol and aluminum sol; the particle size of the inorganic sol is 2-50 nm.

Preferably, the solvent is an alcohol, water or an alcohol-water mixture.

Preferably, the precoating liquid for enhancing the surface adhesion of the flexible glass substrate is prepared by the following method: weighing the components in proportion, adding the polyhydroxy polymer, the silane coupling agent and the inorganic sol into a solvent, heating to 40-90 ℃, and uniformly stirring to obtain the pre-coating liquid.

The application method of the pre-coating liquid for enhancing the surface adhesion of the flexible glass substrate comprises the following steps:

(1) uniformly coating the pre-coating liquid on flexible glass, and performing heat curing to obtain a pre-coating layer;

(2) and uniformly coating a layer of UV hardening liquid on the surface of the precoating layer, curing to obtain a UV hardening layer, and attaching a protective film after the UV hardening layer is cooled.

Preferably, the heat curing temperature in the step (1) is 80 to 200 ℃ for 1 to 30 min.

Preferably, the thickness of the precoat layer is 0.5 to 35 μm, and the thickness of the UV curable layer is 2 to 35 μm.

The invention has the following beneficial effects:

(1) the polyhydroxy polymer and the inorganic sol added in the precoating liquid disclosed by the invention both contain a large amount of hydroxyl groups, so that a firm hydrogen bond can be formed between the polyhydroxy polymer and the inorganic sol, and after the polyhydroxy polymer and the inorganic sol are cured, a certain amount of hydroxyl groups can still be reserved on the surface of the precoating layer, so that the adhesion between the precoating layer and the UV hardened layer can be increased, the binding force between the UV hardened layer and the flexible glass substrate is improved, the comprehensive formation of a flexible glass hardened film is effectively improved, and the service life is prolonged;

(2) the added silane coupling agent can be bonded with sol particles in the inorganic sol after hydrolysis, on one hand, a larger structure is obtained after bonding, larger steric hindrance can be generated, and the sol particles are favorably dispersed, on the other hand, the bonded structure not only contains polar hydroxyl groups and other groups, but also contains nonpolar hydrocarbon groups and other groups, so that the sol particles can be well dispersed in ethanol, water or an alcohol-water mixture, the sol particles are uniformly distributed in the pre-coating solution, the uniformity of the pre-coating solution is improved, and the adhesive force between the pre-coating layer and the base material layer and between the pre-coating layer and the UV hardened layer is further improved;

(3) the pre-coating layer is added between the flexible glass substrate and the UV hardening layer, so that the thickness of the UV hardening layer can be reduced on the premise of ensuring the thickness of the total coating (the pre-coating layer and the UV hardening layer), the problem that the UV hardening layer is too thick and easy to crack can be effectively avoided, and the effects of protection and splashing prevention can be achieved;

(4) according to the invention, the method of coating the pre-coating liquid between the flexible glass substrate and the UV hardened layer to obtain the pre-coating layer is adopted to improve the adhesive force of the UV hardened layer, the comprehensive performances of optical transparency, hardness, wear resistance and the like of the UV hardened layer are not influenced, and the transparency of the substrate, the pre-coating layer and the UV hardened layer is higher, so that the flexible glass hardened film has higher integral transparency.

Detailed Description

The present invention will now be described in further detail with reference to examples.

The precoating liquid for enhancing the surface adhesion of the flexible glass substrate is prepared by the following method: weighing the components in proportion, adding the polyhydroxy polymer, the silane coupling agent and the inorganic sol into a solvent, heating to 40-90 ℃, and uniformly stirring to obtain the pre-coating liquid.

Wherein the particle size of the inorganic sol is 2-50 nm.

The application method of the pre-coating liquid for enhancing the surface adhesion of the flexible glass substrate comprises the following steps:

(1) uniformly coating the pre-coating liquid on flexible glass, and performing heat curing to obtain a pre-coating layer;

(2) and uniformly coating a layer of UV hardening liquid on the surface of the precoating layer, curing to obtain a UV hardening layer, and attaching a protective film after the UV hardening layer is cooled.

Wherein the thermosetting temperature in the step (1) is 80-200 ℃, and the time is 1-30 min. The thickness of the obtained precoat was 0.5 to 35 μm, and the thickness of the UV-cured layer was 2 to 35 μm. The UV hardening liquid in the step (2) can be directly selected from commercially available UV hardening liquids for flexible glass, and the specific curing conditions are subject to the requirements of the selected commercially available UV hardening liquids.