CN113698865B - Coating for improving impact strength of glass and preparation method thereof - Google Patents
Coating for improving impact strength of glass and preparation method thereof Download PDFInfo
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- CN113698865B CN113698865B CN202111032163.4A CN202111032163A CN113698865B CN 113698865 B CN113698865 B CN 113698865B CN 202111032163 A CN202111032163 A CN 202111032163A CN 113698865 B CN113698865 B CN 113698865B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D179/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen, with or without oxygen, or carbon only, not provided for in groups C09D161/00 - C09D177/00
- C09D179/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
- C09D179/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
- C03C17/001—General methods for coating; Devices therefor
- C03C17/002—General methods for coating; Devices therefor for flat glass, e.g. float glass
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
- C03C17/006—Surface treatment of glass, not in the form of fibres or filaments, by coating with materials of composite character
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
- C03C17/28—Surface treatment of glass, not in the form of fibres or filaments, by coating with organic material
- C03C17/32—Surface treatment of glass, not in the form of fibres or filaments, by coating with organic material with synthetic or natural resins
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/20—Diluents or solvents
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/63—Additives non-macromolecular organic
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C2217/00—Coatings on glass
- C03C2217/70—Properties of coatings
- C03C2217/78—Coatings specially designed to be durable, e.g. scratch-resistant
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
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- Surface Treatment Of Glass (AREA)
Abstract
The invention relates to a coating for improving the impact strength of glass, which comprises the following components in percentage by weight: 8-15% of transparent polyimide or transparent polyamic acid, 20-30% of N, N-dimethylformamide, 35-45% of N, N-dimethylacetamide, 25-35% of ethyl acetate, 0.1-1% of flatting agent, 0.1-1% of defoaming agent and 1-2% of silane coupling agent. The coating for improving the impact strength of the glass is coated on the surface of the glass cover plate, so that the ball falling performance of the glass cover plate can be greatly improved under the condition of not increasing the thickness of the cover plate glass, and the cover plate of the corresponding electronic equipment tends to light and thin design.
Description
Technical Field
The invention relates to the technical field of coatings, and particularly relates to a coating for improving the impact strength of glass and a preparation method thereof.
Background
The glass falling ball impact tester is used for testing the impact strength of products such as plastics, building materials, ceramics, acrylic, glass, coatings, hardware and the like. The falling ball impact strength test is a common method for testing the impact resistance of a glass cover plate, and is generally applied to related industries. The falling height is gradually increased until fracture occurs, and the falling ball height represents the impact strength of the glass cover plate to be tested. In order to improve the impact strength of the glass cover plate, it is common practice to increase the thickness of the glass, but the increase in the thickness of the glass is not favorable for the thin miniaturization and light weight of the electronic device.
Disclosure of Invention
Technical problem to be solved
In view of the above disadvantages and shortcomings of the prior art, the present invention provides a coating for improving impact strength of glass and a preparation method thereof, wherein the coating for improving impact strength of glass is coated on the surface of a glass cover plate, such that ball dropping performance of the glass cover plate can be greatly improved without increasing glass thickness, and the cover plate of the corresponding electronic device is lighter.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
in a first aspect, the invention provides a coating for improving the impact strength of glass, which comprises the following components in percentage by weight: 8-15% of transparent polyimide or transparent polyamic acid, 20-30% of N, N-dimethylformamide, 35-45% of N, N-dimethylacetamide, 25-35% of ethyl acetate, 0.1-1% of flatting agent, 0.1-1% of defoaming agent and 1-2% of silane coupling agent.
Preferably, the leveling agent is selected from one or more of BYK-345, BYK-348 or BYK-371; the defoaming agent is selected from one or more of polydimethylsiloxane, polyoxyethylene, polyoxypropylene and pentaerythritol ether; the silane coupling agent is selected from any one or more of KH550 (gamma-aminopropyltriethoxysilane), KH560 and KH 570.
According to the preferred embodiment of the invention, the coating for improving the impact strength of the glass comprises the following components in percentage by weight: 9-11% of transparent polyimide or transparent polyamic acid, 21-24% of N, N-dimethylformamide, 38-42% of N, N-dimethylacetamide, 25-26% of ethyl acetate, 0.5-0.8% of flatting agent, 0.5-0.8% of defoaming agent and 1.2-1.6% of silane coupling agent.
According to the preferred embodiment of the invention, the coating for improving the impact strength of the glass comprises the following components in percentage by weight: 10% of transparent polyimide or transparent polyamic acid, 22% of N, N-dimethylformamide, 40% of N, N-dimethylacetamide, 25% of ethyl acetate, 0.5% of a leveling agent, 0.5% of a defoaming agent and 2% of a silane coupling agent.
Preferably, the transparent polyimide or transparent polyamic acid is produced by Japan Sun ink Co or Liaoke Huahui Co.
In a second aspect, the present invention provides a method for preparing a coating for improving impact strength of glass, comprising:
s1, sequentially adding N, N-dimethylformamide, N-dimethylacetamide and ethyl acetate into a stirring kettle according to a formula ratio, starting a stirrer, setting the rotating speed to be 300-500 rpm, and sealing the stirring kettle in the stirring process;
S2, adding transparent polyimide or transparent polyamide acid resin into the stirring kettle, setting the rotating speed to be 500-800 rpm, and stirring for 20-40 minutes;
s3, slowly dripping the flatting agent into the stirring kettle according to the formula proportion, setting the rotating speed to be 500-800 rpm, and stirring for 10-30 minutes;
s4, slowly dripping a defoaming agent into the stirring kettle according to the formula proportion, setting the rotating speed to be 500-800 rpm, and stirring for 20-40 minutes;
s5, filtering the prepared product by using high-precision filtering equipment of 0.1-0.5 mu m to obtain the paint for improving the impact strength of the glass;
s6, adding 1-2% of silane coupling agent into the product before use, and hermetically stirring at 500-800 rpm for 8-20 minutes for use. The product added with the silane coupling agent is used up within 24 hours and is discarded for more than 24 hours.
In a third aspect, the present invention also provides a method for improving the ball dropping performance and reducing the thickness of a glass cover plate, comprising: and coating the coating for improving the impact strength of the glass of any one of the above embodiments on the surface of the glass cover plate, and curing and molding.
Preferably, the curing conditions are:
when the resin component in the coating for improving the impact strength of the glass is transparent polyimide, sequentially baking according to the following conditions: baking at 150 ℃ for 30 minutes;
When the resin component in the paint for improving the impact strength of the glass is transparent polyamic acid, sequentially baking according to the following conditions: baking at 80 ℃ for 15 minutes, baking at 120 ℃ for 15 minutes, baking at 160 ℃ for 15 minutes, baking at 200 ℃ for 15 minutes, baking at 250 ℃ for 15 minutes, and baking at 300 ℃ for 20 minutes.
According to the research of the inventor, the imidization reaction is carried out in the process of baking and drying the transparent polyamic acid to generate the transparent polyimide. By adopting the multi-stage baking and curing process, the imidization rate can be highest, and the optical and mechanical properties of the finally formed coating are optimal. Otherwise, if the baking is not carried out according to a multi-stage gradient temperature rise system, the mechanical property of the coating is influenced, and the most critical ball falling property of the coating is also influenced.
In a fourth aspect, the invention further provides a light electronic device cover plate with high ball dropping performance, which is characterized by comprising a glass cover plate and a coating for improving the impact strength of glass, wherein the coating for improving the impact strength of glass is cured on the glass cover plate, and the coating for improving the impact strength of glass is the coating for improving the impact strength of glass in any embodiment.
(III) advantageous effects
The transparent polyimide material in the components of the coating for improving the impact strength of the glass is a film forming material, and the coating is used as a connecting material of a functional coating, has high transparency, can meet the requirement of optical transparency of a cover plate of electronic equipment, and can improve the ball dropping performance of the cover plate of the glass due to high strength and high toughness.
The silane coupling agent in the paint for improving the impact strength of the glass is mainly used for improving the bonding firmness between a paint coating for improving the impact strength of the glass and a glass cover plate. In the ingredients, three kinds of N, N-Dimethylformamide (DMF), N-Dimethylacetamide (DMA) and ethyl acetate are combined to be used as a good composite solvent, and the boiling points of the ethyl acetate, the N, N-Dimethylformamide (DMF) and the N, N-Dimethylacetamide (DMAC) are respectively as follows: the temperature of 77 ℃, 153 ℃ and 166 ℃ forms a gradient from low to high, so that the solvent is volatilized in a gradient manner in the drying film-forming process, the surface of the coating is smoother, and the abnormity such as concave-convex points, bubble holes and the like can not occur.
When only ethyl acetate is used as a solvent, the film is firstly formed on the surface of the coating during baking because the solvent is volatilized too fast, and the film formed on the surface is broken by the volatilization of the internal solvent, so that bubble holes are formed, and the appearance is poor. In addition, the solvent is volatilized too fast, which is not beneficial to the imidization reaction of the polyamic acid, thereby affecting the performance of the functional coating and having an unsatisfactory effect on improving the ball falling performance. When ethyl acetate and N, N-dimethylformamide are used as the composite solvent, the overall volatilization rate of the coating is relatively high, which is not beneficial to imidization reaction.
According to tests, after the coating for improving the impact strength of the glass is coated on the surface of the glass cover plate, the coating is baked and cured, and the adhesion force of the coating at normal temperature and the boiling test grade of the coating are 5B grades (indicating that the coating does not fall off completely).
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail below with reference to specific embodiments.
Example 1
The embodiment provides a coating for improving the impact strength of glass, which comprises the following components in percentage by mass: 10% of transparent polyimide, 22% of N, N-dimethylformamide, 40% of N, N-dimethylacetamide, 25% of ethyl acetate, 0.5% of BYK-345, 0.5% of polydimethylsiloxane and 2% of KH 550.
The preparation method comprises the following steps: firstly, sequentially adding N, N-dimethylformamide, N-dimethylacetamide and ethyl acetate into a stirring kettle according to a formula ratio, starting a stirrer, setting the rotating speed to be 500rpm, and sealing the stirring kettle in the stirring process. The transparent polyimide was added to the stirred tank, and the mixture was stirred at a set rotation speed of 800rpm for 40 minutes. According to the formula proportion, slowly dripping the leveling agent BYK-345 into the stirring kettle, setting the rotating speed to be 800rpm, and stirring for 20 minutes; slowly dripping defoaming agent polydimethylsiloxane into the stirring kettle, setting the rotating speed to be 800rpm, stirring for 30 minutes, and filtering the prepared product through 0.2 mu m high-precision filtering equipment to obtain the coating for improving the impact strength of the glass. Immediately before use, the silane coupling agent KH550 is added into the product, and the product is used after sealed stirring at 800rpm for 10 minutes. The product after adding the silane coupling agent is used within 24 h.
The coating for improving the impact strength of the glass is coated on a glass cover plate with the thickness of 662 mu m, and then the glass cover plate is baked according to the following conditions in sequence: baking at 150 ℃ for 30 minutes, baking at 200 ℃ for 15 minutes, baking at 250 ℃ for 10 minutes, and baking at 300 ℃ for 10 minutes; the coating is cured into a coating after baking, and the thickness of the coating is 10 mu m. The coated glass cover plate was subjected to a hundred grid test with the following results:
note: the hundred grid test is according to ASTM-D3002D 3359 standard. The hundred-grid test is used for evaluating the adhesion of the coating on the substrate and is divided into 1-5 grades, the higher the grade number is, the stricter the requirement is, and the grade 5 represents that the coating can not fall off completely. The poaching test is 30min poaching at 80 ℃.
As can be seen from the above table, when the glass thickness is 662 μm and the coating thickness is 10 μm, the cover plate with a thickness of 672 μm, which is composed of the glass and the coating, has a light transmittance of 91.3% and a haze of 0.33%. Therefore, the composite cover plate consisting of the glass cover plate and the coating for improving the impact strength of the glass has high light transmittance and low haze, and completely meets the use requirement of the screen cover plate of the electronic equipment.
The coatings for improving the impact strength of glass prepared in example 1 were applied to glass cover plates of different thicknesses as shown in the following table, and then the following were applied: baking and curing under the conditions of baking at 150 ℃ for 30 minutes → baking at 200 ℃ for 15 minutes → baking at 250 ℃ for 10 minutes → baking at 300 ℃ for 10 minutes, and respectively testing the ball drop height of the composite cover plate consisting of the glass cover plate and the coating for improving the impact strength of the glass.
The falling ball test method comprises the following steps: falling ball bearing jig: the bakelite is made of a profiling support at the periphery, the width of the support at the periphery is 5mm, and the middle is kept clear. And (3) point setting: a center point. And (4) dropping 130g of steel balls from the height of 50cm, testing for 5 times at each height, confirming that the product is not broken after the test is finished, raising the height at intervals of 5cm until the product is broken, and recording the height value before the breakage. The results are reported as follows:
from the above table test, it can be seen that: when the total "glass + coating" thickness is 650cm (641cm +9cm), the ball drop height reaches 110 cm. The coating for improving the impact strength of the glass can greatly increase the ball drop height of the glass cover plate, properly reduce the thickness of the glass and properly increase the thickness of the coating, and can obviously improve the ball drop test performance of the composite cover plate on the premise of ensuring that the total thickness is not greatly increased.
Example 2
The embodiment provides a coating for improving the impact strength of glass, which comprises the following components in percentage by mass: 10% of transparent polyamic acid resin, 22% of N, N-dimethylformamide, 40% of N, N-dimethylacetamide, 25% of ethyl acetate, 0.5% of BYK-345, 0.5% of polydimethylsiloxane and 2% of KH 550.
The preparation method comprises the following steps: firstly, sequentially adding N, N-dimethylformamide, N-dimethylacetamide and ethyl acetate into a stirring kettle according to a formula ratio, starting a stirrer, setting the rotating speed to be 500rpm, and sealing the stirring kettle in the stirring process. The transparent polyamic acid resin was added to the stirring vessel, and the stirring was carried out at a set rotation speed of 500rpm for 40 minutes. According to the formula proportion, slowly dripping the leveling agent BYK-345 into the stirring kettle, setting the rotation speed to 600rpm, and stirring for 20 minutes; slowly dripping defoaming agent polydimethylsiloxane into the stirring kettle, setting the rotating speed to be 600rpm, stirring for 35 minutes, and filtering the prepared product through 0.2 mu m high-precision filtering equipment to obtain the coating for improving the impact strength of the glass. Immediately before use, the silane coupling agent KH550 is added into the product, and the product is used after sealed stirring at 500rpm for 15 minutes. The product after adding the silane coupling agent is used within 24 h.
The coating for improving the impact strength of the glass is coated on a glass cover plate with the thickness of 656 mu m, and then the glass cover plate is baked according to the following conditions in sequence: baking at 80 ℃ for 15 minutes → baking at 120 ℃ for 15 minutes → baking at 160 ℃ for 15 minutes → baking at 200 ℃ for 15 minutes → baking at 250 ℃ for 15 minutes → baking at 300 ℃ for 20 minutes. The coating is cured into a coating after baking, and the thickness of the coating is 10 mu m. The coated glass cover plate was subjected to a hundred grid test with the following results:
note: the hundred grid test is according to ASTM-D3002D 3359 standard. The hundred-grid test is used for evaluating the adhesion of the coating on the substrate and is divided into 1-5 grades, the higher the grade number is, the stricter the requirement is, and the grade 5 represents that the coating can not fall off completely. The poaching test is 30min poaching at 80 ℃.
As can be seen from the above table, when the glass thickness is 656 μm and the coating thickness is 10 μm, the transmittance of the cover plate with a thickness of 666 μm, which is composed of glass and coating, is 91.0%, and the haze is 0.29%. Therefore, the composite cover plate consisting of the glass cover plate and the coating for improving the impact strength of the glass has high light transmittance and low haze, and completely meets the use requirement of the screen cover plate of the electronic equipment.
The coatings for improving the impact strength of glass prepared in example 2 were applied to glass cover plates of different thicknesses as shown in the following table, and then the following were applied: baking at 80 ℃ for 15 minutes → baking at 120 ℃ for 15 minutes → baking at 160 ℃ for 15 minutes → baking at 200 ℃ for 15 minutes → baking at 250 ℃ for 15 minutes → baking at 300 ℃ for 20 minutes, and respectively testing the ball drop height of the composite cover plate consisting of the glass cover plate and the coating for improving the impact strength of the glass. The ball drop test results were recorded as follows:
From the above table test, it can be seen that: the ball drop height reached 110cm when the "glass + coating" total thickness was 648cm (640cm +8cm), whereas the ball drop height was only 75cm for glass 648cm which was not coated with a coating to improve the impact strength of the glass. Therefore, the coating for improving the impact strength of the glass can greatly increase the ball drop height of the glass cover plate, properly reduce the thickness of the glass and properly increase the thickness of the coating, and can obviously improve the ball drop test performance of the composite cover plate on the premise of ensuring that the total thickness is not greatly increased.
As can be seen from comparison of examples 1-2, in example 1, the coating material was prepared using the transparent polyimide as the main resin, in example 2, the coating material was prepared using the transparent polyamic acid, which is the raw material of the transparent polyimide, as the main resin, and in example 2, the baking process was performed at a higher temperature range so that the imidization reaction was sufficiently performed. In terms of process, the coating for improving the impact strength of the glass in the embodiment 1 is better than the coating in the embodiment 2, but in terms of coating cost, the coating in the embodiment 2 is lower in cost.
Example 3
On the basis of example 1, the component composition of a good solvent in the paint for improving the impact strength of the glass is changed, and three kinds of paints are respectively prepared for performance test. The prepared coating for improving the impact strength of the glass is coated on a 655 μm thick glass cover plate, and then the following steps are carried out: baking and curing under the conditions of baking at 150 ℃ for 30 minutes → baking at 200 ℃ for 15 minutes → baking at 250 ℃ for 10 minutes → baking at 300 ℃ for 10 minutes, and respectively testing the ball drop height of the composite cover plate consisting of the glass cover plate and the coating for improving the impact strength of the glass.
A first group: 10% of transparent polyimide, 87% of ethyl acetate, 0.5% of BYK-345, 0.5% of polydimethylsiloxane and 2% of KH 550.
Second group: 10% transparent polyimide, 42% DMF, 45% ethyl acetate, 0.5% BYK-345, 0.5% polydimethylsiloxane, 2% KH 550.
Third group: 10% of transparent polyimide, 23.5% of N, N-dimethylformamide, 40% of N, N-dimethylacetamide, 23.5% of ethyl acetate, 0.5% of BYK-345, 0.5% of polydimethylsiloxane and 2% of KH 550.
The effect of the coating on the ball drop performance of the glass cover plate when different solvents were used in the coating formulations was tested and the results are given in the following table:
therefore, when the third group uses the compound solvent of three good solvents of ethyl acetate + DMF + DMAC, the performance of the prepared coating is optimal, and the second group uses the compound solvent of ethyl acetate + DMF, but the performance of the coating prepared by only using ethyl acetate is the worst.
In addition, when the ethyl acetate and N, N-dimethylacetamide composite solvent is used, the viscosity of the coating is high (25 ℃, viscosity is more than 4000CPS), the construction is not facilitated, and the viscosity of the whole formula (25 ℃, viscosity is 1000-3000 CPS) can be reduced by adding N, N-dimethylformamide.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (5)
1. A method for improving the ball falling performance of a glass cover plate and reducing the thickness of the glass cover plate is characterized in that,
1) preparing a coating for improving the impact strength of glass, wherein the coating comprises the following components in percentage by weight: 8-15% of transparent polyamic acid, 20-30% of N, N-dimethylformamide, 35-45% of N, N-dimethylacetamide, 25-35% of ethyl acetate, 0.1-1% of flatting agent, 0.1-1% of defoaming agent and 1-2% of silane coupling agent;
2) coating the paint for improving the impact strength of the glass on the surface of the glass cover plate and curing, wherein the curing method comprises the following steps of baking in sequence: baking at 80 ℃ for 15 minutes, baking at 120 ℃ for 15 minutes, baking at 160 ℃ for 15 minutes, baking at 200 ℃ for 15 minutes, baking at 250 ℃ for 15 minutes, and baking at 300 ℃ for 20 minutes.
2. The method of claim 1, wherein the leveling agent is selected from one or more of BYK-345, BYK-348, or BYK-371; the defoaming agent is selected from one or more of polydimethylsiloxane, polyoxyethylene, polyoxypropylene and pentaerythritol ether; the silane coupling agent is selected from any one or more of KH550, KH560 and KH 570.
3. The method according to claim 1, wherein the coating for improving the impact strength of the glass comprises the following components in percentage by weight: 9-11% of transparent polyamic acid, 21-24% of N, N-dimethylformamide, 38-42% of N, N-dimethylacetamide, 25-26% of ethyl acetate, 0.5-0.8% of flatting agent, 0.5-0.8% of defoaming agent and 1.2-1.6% of silane coupling agent.
4. The method according to claim 1, wherein the coating for improving the impact strength of the glass comprises the following components in percentage by weight: 10% of transparent polyamic acid, 22% of N, N-dimethylformamide, 40% of N, N-dimethylacetamide, 25% of ethyl acetate, 0.5% of a leveling agent, 0.5% of a defoaming agent and 2% of a silane coupling agent.
5. The method according to claim 1, wherein in step 1), the method for preparing the coating for improving the impact strength of the glass comprises the following steps:
s1, sequentially adding N, N-dimethylformamide, N-dimethylacetamide and ethyl acetate into a stirring kettle according to a formula ratio, starting a stirrer, setting the rotating speed to be 300-500 rpm, and sealing the stirring kettle in the stirring process;
s2, adding transparent polyamic acid resin into the stirring kettle, setting the rotating speed to be 500-800 rpm, and stirring for 20-40 minutes;
s3, slowly dripping the leveling agent into the stirring kettle according to the formula proportion, setting the rotating speed to be 500-800 rpm, and stirring for 10-30 minutes;
s4, slowly dripping a defoaming agent into the stirring kettle according to the formula proportion, setting the rotating speed to be 500-800 rpm, and stirring for 20-40 minutes;
s5, filtering the obtained product by using high-precision filtering equipment of 0.1-0.5 mu m to obtain the paint for improving the impact strength of the glass;
S6, adding 1-2% of silane coupling agent into the product before use, and hermetically stirring at 500-800 rpm for 8-20 minutes for use.
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| WO2019189483A1 (en) * | 2018-03-28 | 2019-10-03 | 住友化学株式会社 | Varnish containing transparent polyimide-based polymer and solvent |
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|---|---|---|---|---|
| CN100469848C (en) * | 2004-11-23 | 2009-03-18 | 比亚迪股份有限公司 | Ultraviolet light curing coating and production thereof |
| CN104673071A (en) * | 2013-12-03 | 2015-06-03 | 青岛惠城石化科技有限公司 | Preparation of environment-friendly double-component polyurethane coating |
| JP6537584B2 (en) * | 2017-12-04 | 2019-07-03 | ユニチカ株式会社 | Coating solution for glass substrate |
| CN112724434A (en) * | 2020-12-23 | 2021-04-30 | 宁波长阳科技股份有限公司 | Transparent polyimide film and preparation method and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019189483A1 (en) * | 2018-03-28 | 2019-10-03 | 住友化学株式会社 | Varnish containing transparent polyimide-based polymer and solvent |
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Denomination of invention: A coating for improving the impact strength of glass and its preparation method Effective date of registration: 20221230 Granted publication date: 20220729 Pledgee: Bank of China Limited Xiamen Xiang'an sub branch Pledgor: Xiamen Sandesen Technology Co.,Ltd. Registration number: Y2022980029983 |