High-toughness wear-resistant self-recovery coating for organic glass and preparation method thereof

Abstract

The invention discloses a high-toughness wear-resistant self-recovery coating for organic glass and a preparation method thereof, the high-toughness wear-resistant self-recovery coating is prepared from a component A and a component B according to a mass ratio of 2: 1, the component A is composed of polyester resin, an auxiliary bag, a drier and a solvent 1, and the component B is composed of a curing agent and a solvent 2; the high-toughness wear-resistant self-recovery polyurethane coating is prepared by mixing two or more polyester resins and reacting with aliphatic isocyanate, and soft and hard segments of carbamate molecules are intertwined, so that on one hand, a basis for toughness and wear resistance of the polyurethane coating is provided; and on the other hand, the rapid recovery performance of the coating is realized. The preparation process is simple, and the prepared coating is high in toughness, high in transparency and short in self-recovery time. The haze of the coating is 5-20% and the light transmittance of the coating is 80-90% after a wear-resistant test, and the light transmittance of the coating can be recovered to 94% or above two hours later. The coating prepared by the method is easy to realize industrial application and has a good application prospect.

Description

Technical Field

[0001] The invention belongs to the technical field of fine chemical coating materials and applications, and specifically relates to a high-strength, wear-resistant and self-recovering coating for organic glass and a preparation method thereof. Background Art

[0002] As a common and widely used material, glass plays an important role in the fields of architecture, automobiles, electronics, etc. However, there are often some problems on the surface of glass in engineering applications. For example, optical display devices face inevitable challenges in maintaining optical performance and life due to mechanical wear and scratches during use. Secondly, smartphone screens often suffer surface damage caused by impacts and scratches, which may seriously affect their overall optical functions. Similarly, special optical lenses and eyeglass lenses are also susceptible to interface wear in different usage environments, which not only leads to a decrease in refractive index, but also causes permanent and irreversible damage. Therefore, the development of glass surface protective coating technology with high transparency, self-healing ability and long-term durability in engineering applications has far-reaching scientific significance and practical value.

[0003] Coating is a convenient and effective way to improve the surface properties of glass. It has the ability to adapt to various surface conditions and can also give objects different protective properties. It can effectively protect the glass surface from mechanical wear and scratches, while preventing the erosion of many other harmful factors in the environment. Therefore, in the organic glass industry, a strong, wear-resistant and self-healing coating is essential.

[0004] There are often some problems with the glass surface, such as high hardness and easy scratches, which seriously reduces the life and performance of the corresponding equipment. Traditional glass protective coatings introduce external components, such as microcapsules, carbon nanotubes, microvessels, glass fibers or nanoparticles containing repair agent systems to achieve self-repair functions. This method requires various repair agent systems to be pre-embedded and then added to the matrix. When the material is damaged, the repair agent in the damaged area is released under the action of external stimuli (force, pH value, temperature, etc.), thereby achieving self-repair. The repair agent can only have a repair effect when it reaches a certain level. At the same time, the introduction of the repair agent will reduce the main performance of the coating; in addition, UV-curing self-repairing coatings also need to introduce photosensitive group substances. Although intrinsic self-repairing coatings do not require an external repair system, the coating material itself must contain special chemical bonds or other physical and chemical properties such as reversible covalent bonds, non-covalent bonds, molecular diffusion, etc. to achieve self-repair functions. The molecular structure design of the coating matrix material is the biggest challenge facing this method. If the glass protective coating is not repaired promptly and effectively after being damaged, these defects will significantly reduce the protective effect of the coating on the substrate and the adhesion of the coating, seriously affecting the structure or function of the equipment. At present, the preparation process of protective coatings on the surface of glass materials is complex and costly, the coating has high hardness, poor wear resistance and long self-recovery time. Summary of the invention

[0005] The main purpose of the present invention is to prepare a high-strength, wear-resistant and self-recovering coating for organic glass; the coating is a high-strength, transparent elastomer material with a simple preparation process, which solves the problems of poor wear resistance and long self-recovery time of the coating during use, and solves the problem of maintaining its optical properties without affecting its comprehensive engineering performance. The coating is suitable for the protection of various glass surfaces.

[0006] The present invention provides a high-toughness wear-resistant self-recovery coating for organic glass, which is prepared from component A and component B in a mass ratio of 2:1.

[0007] The component A is composed of the following components by mass percentage:

[0008]

[0009] The polyester resin is a mixture of two or more of HPE 1170B, Synthoester TH 2844 and PCL-3057.

[0010] The additive package includes a defoamer, a leveling agent, and a surface additive;

[0011] The defoamer in the additive package is a polymer defoamer, such as at least one of BYK-054, BYK-1790, and BYK-1799;

[0012] The leveling agent in the additive package is an organic silicon surface additive, such as at least one of BYK-306, BYK-323, and BYK-378;

[0013] The surface additive in the additive package is a hydroxyl-containing organosilicon-modified polyacrylate solution, such as at least one of BYK-3700, Castle3370, and GS-1050.

[0014] The drying agent is an organic tin catalyst and an organic bismuth catalyst. The organic tin catalyst is a dibutyltin dilaurate solution with a content of 1%, and the organic bismuth catalyst is an organic bismuth DY-20 solution with a content of 1%.

[0015] The solvent 1 is a mixture of one or more of cyclohexanone, xylene and butyl acetate.

[0016] The component B is composed of the following components in terms of mass percentage:

[0017] Curing agent 60%~90%

[0018] Solvent 2 10%~40%

[0019] The curing agent is an aliphatic isocyanate, such as a mixture of one or more of N3390 and N75.

[0020] The solvent 2 is a mixture of one or more of xylene and butyl acetate.

[0021] The present invention also provides a method for preparing a high-strength, wear-resistant and self-recovering coating for organic glass, wherein the materials are prepared according to the above formula.

[0022] The preparation process of component A is:

[0023] First, add solvent 1 to a polyester resin, stir at high speed to make it uniform, then add another polyester resin or a mixture of two or more polyester resins, stir at high speed to make it uniform, then add defoamer, leveling agent, surface additive, drying agent in sequence, stir at high speed for 10 minutes, and filter the material to obtain component A;

[0024] The preparation process of component B is:

[0025] Add solvent 2 to the curing agent, stir for 20 minutes, and filter the material to obtain component B;

[0026] Component A and component B are mixed in a mass ratio of 2:1, stirred evenly, adjusted to a suitable viscosity, and filtered to obtain a high-strength, wear-resistant, self-recovering coating for organic glass.

[0027] By utilizing the thermal motion in the polymer solution, two or more polyester resins are physically cross-linked and reacted with aliphatic isocyanates to prepare a wear-resistant self-healing coating with multiple hydrogen bonds inside the structure, high-density cross-linking and high transparency. The hydrogen bonds in the coating show strong directionality and affinity, providing good mechanical strength for the coating. Secondly, the soft and hard segments in the formed polyurethane elastomer coating are intertwined and interlocked with each other, making the coating have excellent wear resistance and at the same time giving the coating excellent self-healing properties.

[0028] Beneficial Effects

[0029] By matching different polyester resins, a polyurethane elastomer with soft and hard segments entangled with each other is prepared, which gives the coating strong and tough properties and makes the coating have excellent wear resistance; secondly, the interaction and hydrogen bonds between the soft and hard segments in the polyurethane coating structure make the coating exhibit excellent recovery properties.

[0030] The preparation process of the present invention is simple, and the prepared coating has high toughness, high transparency, strong self-recovery ability and fast recovery time. After the wear resistance test, the haze of the coating is 5-20%, the light transmittance is 80%-90%, and the light transmittance can be restored to more than 94% after two hours. The coating prepared by the present invention is easy to realize industrial application and has good application prospects. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Embodiment 1:

[0033] (1) Preparation of component A: 1100 g of butyl acetate was added to 500 g of PCL-3057 resin, and the mixture was stirred at high speed (1500 r / min) for 10 min. Then, 200 g of hyperbranched polyester HPE 1170B resin was added, and the mixture was stirred at high speed for 10 min. Then, 5.4 g of BYK-054, 2.10 g of BYK-323, 80 g of BYK-3700 and 15 g of 1% dibutyltin dilaurate were added in sequence. The mixture was stirred at high speed (1500 r / min) for 10 min, and the mixture was filtered to obtain component A.

[0034] (2) Preparation of component B: 451.37 g of butyl acetate was added to 2050 g of isocyanate N-3390, stirred for 20 minutes, and filtered to obtain component B;

[0035] (3) Paint preparation and construction: Mix component A and component B in a mass ratio of 2:1, stir evenly, adjust to a suitable viscosity, and filter to obtain a high-strength, wear-resistant, self-healing coating for organic glass. Stir evenly and spray it on the glass plate. After the surface is dry, bake at 80°C for 4 hours to obtain a high-strength, wear-resistant, self-healing coating.

[0036] (4) Implementation effect: According to the standard GB / T 1768-2006, after 200 revolutions of abrasion resistance test, the haze is 20% and the light transmittance is 85%. After being placed at room temperature for 2 hours, the light transmittance is 93%.

[0037] Embodiment 2:

[0038] (1) Preparation of component A: 715 g of butyl acetate was added to 178.75 g of polyester resin PCL-3057, and the mixture was stirred at high speed (1500 r / min) for 10 min. Then, 905.45 g of Synthoester TH 2844 was added, and the mixture was stirred at high speed (1500 r / min) for 10 min. Then, 5.39 g of BYK-1790, 5.39 g of BYK-378, 88.4 g of GS-1050 and 4.55 g of 1% organic bismuth DY-20 were added in sequence, and the mixture was stirred at high speed (1500 r / min) for 10 min. Then, the mixture was filtered to obtain component A.

[0039] (2) Preparation of component B: 877.40 g of xylene was added to 2372.60 g of isocyanate N-75, and the mixture was stirred for 20 minutes, and then filtered to obtain component B;

[0040] (3) Paint preparation and construction: Mix component A and component B in a mass ratio of 2:1, stir evenly, adjust to a suitable viscosity, and filter to obtain a high-strength, wear-resistant, self-healing coating for organic glass. Stir evenly and spray it on the glass plate. After the surface is dry, bake at 80°C for 4 hours to obtain a high-strength, wear-resistant, self-healing coating.

[0041] (4) Implementation effect: According to the standard GB / T 1768-2006, after 200 revolutions of abrasion resistance test, the haze is 5% and the light transmittance is 86.3%. After being placed at room temperature for 2 hours, the light transmittance is 93.2%.

[0042] Embodiment 3:

[0043] (1) Preparation of Component A: 880 g of butyl acetate was added to 1114.4 g of Synthoester TH 2844 resin, and the mixture was stirred at high speed (1500 r / min) for 10 min. Then, 220 g of PCL-3057 resin was added, and the mixture was stirred at high speed for 10 min. Then, 6.64 g of BYK-054, 6.64 g of BYK-306, 108.8 g of BYK-3700 and 5.6 g of 1% dibutyltin dilaurate were added in sequence, and the mixture was stirred at high speed (1500 r / min) for 10 minutes. The mixture was filtered to obtain Component A.

[0044] (2) Preparation of component B: 770.87 g of butyl acetate was added to 1229.13 g of isocyanate N-3390, and the mixture was stirred for 20 minutes, and then filtered to obtain component B;

[0045] (3) Paint preparation and construction: The prepared component A and component B are mixed in a mass ratio of 2:1, stirred evenly, adjusted to a suitable viscosity, and filtered to obtain a high-strength, wear-resistant, self-healing coating for organic glass. After stirring evenly, spray it on the glass plate, and bake it at 80°C for 4 hours after the surface is dried to obtain a high-strength, wear-resistant, self-healing coating;

[0046] (4) Implementation effect: Referring to the standard GB / T 1768-2006, after 200 turns of abrasion resistance test, the haze is 5.8% and the light transmittance is 91.2%. After being placed at room temperature for 2 hours, the light transmittance is 95.1%.

[0047] The present disclosure has been described by the above-mentioned relevant embodiments, but the above-mentioned embodiments are only examples for implementing the present disclosure. It must be pointed out that the disclosed embodiments do not limit the scope of the present disclosure. On the contrary, changes and modifications made without departing from the spirit and scope of the present disclosure are all within the scope of patent protection of the present disclosure.

Claims

1. A high-toughness, wear-resistant, self-recovering coating for organic glass, characterized in that: It is prepared from component A and component B in a mass ratio of 2:

1. The component A is composed of the following components by mass percentage: The polyester resin is a mixture of two or more of HPE 1170B, Synthoester TH 2844, and PCL-3057. The component B is composed of the following components in terms of mass percentage: Curing agent 60%~90% Solvent 2 10%~40% The curing agent is aliphatic isocyanate.

2. The high-toughness, wear-resistant, self-recovering coating for organic glass according to claim 1, characterized in that: The additive package comprises a defoamer, a leveling agent and a surface additive. The defoamer is a polymer defoamer, the leveling agent is an organosilicon surface additive, and the surface additive is a hydroxyl-containing organosilicon-modified polyacrylate solution.

3. The high-toughness wear-resistant self-recovery coating for organic glass according to claim 1, characterized in that: The polymer defoamer is at least one of BYK-054, BYK-1790, and BYK-1799, the silicone surface additive is at least one of BYK-306, BYK-323, and BYK-378, and the hydroxyl-containing silicone-modified polyacrylate solution is at least one of BYK-3700, Castle-3370, and GS-1050.

4. The high-toughness wear-resistant self-recovery coating for organic glass according to claim 1, characterized in that: The drying agent is at least one of an organic tin catalyst and an organic bismuth catalyst.

5. The high-toughness wear-resistant self-recovery coating for organic glass according to claim 4, characterized in that: The organic tin catalyst is a dibutyltin dilaurate solution with a content of 1%, and the organic bismuth catalyst is an organic bismuth DY-20 solution with a content of 1%.

6. The high-toughness wear-resistant self-recovery coating for organic glass according to claim 1, characterized in that: The solvent 1 is a mixture of one or more of cyclohexanone, xylene and butyl acetate.

7. The high-toughness, wear-resistant, self-recovering coating for organic glass according to claim 1, characterized in that: The curing agent is one or more of N3390 and N75.

8. The high-toughness, wear-resistant, self-recovering coating for organic glass according to claim 1, characterized in that: The solvent 2 is one or more of xylene and butyl acetate.

9. A method for preparing the high-toughness wear-resistant self-recovery coating for organic glass according to any one of claims 1 to 8, characterized in that: The following steps are involved: (1) Preparation of component A: Prepare the materials according to the formula, first add solvent 1 to a polyester resin, stir at high speed to make it uniform, then add another one or a mixture of several polyester resins, stir at high speed to make it uniform, then add defoamer, leveling agent, surface additive, and drying agent in sequence, stir at high speed for 15 minutes, and filter the material to obtain component A; (2) Preparation of component B: Prepare the materials according to the formula, add solvent 2 to the curing agent, stir for 20 minutes, and filter the material, i.e. component B; (3) The prepared component A and component B are mixed in a mass ratio of 2:1, stirred evenly, adjusted to a suitable viscosity, and filtered to obtain a high-strength, wear-resistant, self-healing coating for organic glass.

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