CN106519950B - Windshield rubber paint and preparation method thereof - Google Patents

Abstract

The invention provides a windshield rubber paint and a preparation method thereof, belonging to the field of paints and coatings. A kind of windshield rubber paint, its raw material comprises the first component and the second component that mass ratio is 1:1, by weight, the first component comprises polyester polyol resin 60-70 parts, rutile type titanium 20-30 parts of white powder, 2-3 parts of ultraviolet absorber, 2-3 parts of anti-sticking and stain-resistant surface additives, 0.3-0.5 parts of leveling agent, 0.2-0.5 parts of dispersant and 0.6-1.0 parts of anti-settling agent; The two components are polyester modified aliphatic isocyanate resin, wherein the polyester polyol resin comprises 20%-25% of polycaprolactone polyol and 75%-80% of linear polyester resin in terms of mass percentage. The windshield rubber paint has greatly improved weather resistance, good elasticity and high elongation. The preparation method comprises uniformly mixing the first component and the second component, and the method is simple and easy to operate.

Description

Windshield rubber paint and preparation method thereof

technical field

The invention relates to the field of paints and coatings, in particular to a windshield rubber paint and a preparation method thereof.

Background technique

As we all know, as a decorative and protective windshield rubber paint, its performance is closely related to the composition of the paint. To achieve a paint film with good performance on the rubber surface, it is very important to choose resin raw materials that match the elasticity and hardness of the rubber material, otherwise It is difficult to meet the requirements of windshield rubber for bending flexibility during operation and use. Windshield rubber paint uses isocyanate as a curing agent, which reacts with the resin in the main agent during the curing process to form an elastic paint film that adheres to the rubber surface. In fact, the resin and curing agent in the formula are the main components of the whole formula and play a decisive role in the performance of the product. Ordinary linear polyester resin has good flexibility and elasticity, and good workability, but it has the problem of poor weather resistance, especially when used for the coating of rubber paint for exterior windshields, it is easy to cause loss of gloss and discoloration. Customer's standard requirements. At present, the rubber paints used in the market are generally not as good as the weather resistance of the body paint, and they need to be repainted frequently.

Contents of the invention

The object of the present invention is to provide a windshield rubber paint, which can improve the problem of poor weather resistance of the windshield rubber paint.

Another object of the present invention is to provide a method for preparing windshield rubber paint, so as to prepare windshield rubber paint with good weather resistance.

The present invention solves its technical problems by adopting the following technical solutions.

A kind of windshield rubber paint, its raw material comprises the first component and the second component that mass ratio is 1:1, by weight, the first component comprises polyester polyol resin 60-70 parts, rutile type titanium 20-30 parts of white powder, 2-3 parts of ultraviolet absorber, 2-3 parts of anti-adhesive and stain-resistant surface additives, 0.3-0.5 parts of leveling agent, 0.2-0.5 parts of dispersant and 0.6-1.0 parts of anti-settling agent; The two components are polyester modified aliphatic isocyanate resin, wherein the polyester polyol resin includes 20%-25% of polycaprolactone polyol and 75%-80% of linear polyester resin in terms of mass percentage.

A method for preparing a windshield rubber paint, preparing raw materials, the raw materials include a first component and a second component with a mass ratio of 1:1, wherein, in parts by weight, the first component includes polyester polyol resin 60 -70 parts, 20-30 parts of rutile titanium dioxide, 2-3 parts of ultraviolet absorber, 2-3 parts of anti-adhesive and stain-resistant surface additives, 0.3-0.5 parts of leveling agent, 0.2-0.5 parts of dispersant and anti-settling 0.6-1.0 part of agent; the second component is polyester modified aliphatic isocyanate resin, wherein, polyester polyol resin comprises polycaprolactone polyol 20%-25% and linear polyester resin 75% by mass percentage -80%; and

Mix and stir polyester polyol resin, rutile titanium dioxide and anti-settling agent evenly, grind to a fineness of less than 15 microns, then add ultraviolet absorber, anti-adhesive and anti-fouling surface additives, leveling agent and dispersant, and stir again Prepare the first component uniformly, and then mix the first component and the second component uniformly.

The beneficial effect of a kind of windshield rubber paint provided by the present invention and its preparation method is: this embodiment mixes polycaprolactone polyol and linear polyester resin as polyester polyol resin, thereby has combined polycaprolactone polyol and polycaprolactone polyol and Excellent properties of both linear polyester resins, not only good resistance, but also excellent flexibility, in addition, mixed with polyester modified aliphatic isocyanate resin as the second component, further strengthens the windshield The rubber paint has weather resistance and flexibility, so the windshield rubber paint has high solid content, low viscosity, more environmental protection, lower VOC, greatly improved weather resistance, good elasticity, high elongation and other excellent characteristics. In addition, the method for preparing the windshield rubber paint is simple and easy to operate.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Those who do not indicate the specific conditions in the examples are carried out according to the conventional conditions or the conditions suggested by the manufacturer. The reagents or instruments used were not indicated by the manufacturer, and they were all conventional products that could be purchased from the market.

A windshield rubber paint and a method for preparing the windshield rubber paint according to the embodiments of the present invention are described in detail below.

A windshield rubber paint, which includes a first component and a second component, and the mass ratio of the first component to the second component is 1:1.

Among them, in parts by weight, the first component includes 60-70 parts of polyester polyol resin, 20-30 parts of rutile titanium dioxide, 2-3 parts of ultraviolet absorber, 2-3 parts of anti-adhesive and anti-fouling surface additives part, 0.3-0.5 part of leveling agent, 0.2-0.5 part of dispersant and 0.6-1.0 part of anti-settling agent; the second component is 100% polyester modified aliphatic isocyanate resin, wherein the polyester polyol The resin comprises 20%-25% of polycaprolactone polyol and 75%-80% of linear polyester resin in terms of mass percentage.

Weather resistance refers to the resistance of materials (such as coatings, construction plastics, rubber products, etc.) when they are applied outdoors to withstand the test of climate (such as comprehensive damage caused by light, cold and heat, wind and rain, bacteria, etc.).

In this embodiment, a mixture of polycaprolactone polyol and linear polyester resin is used as the polyester polyol resin, wherein polycaprolactone polyol is an aliphatic linear polyester, which is very soft and has great Extensibility, better light aging resistance, heat aging resistance, water aging resistance, used as a modifier for solvents and latex coatings for various building materials, can improve the toughness of the coating film, improve low temperature characteristics, Reactivity, improve Crosslink density. Linear polyester resin is a polyester resin with a linear structure synthesized by polyhydric alcohols and polyacids with a linear structure. The linear polyester resin has good flexibility. In this embodiment, polycaprolactone polyol and linear polyester resin are mixed according to a specific ratio to form polyester polyol resin, specifically, polycaprolactone polyol 20%-25% and linear polyester resin 75% %-80%, the formed polyester polyol resin not only has good flexibility, but also has good tolerance, and can resist damage caused by light, cold and heat, and wind and rain.

And, in the present embodiment, select 100% polyester modified aliphatic isocyanate resin as the second component, the polyester resin has good film-forming properties, high mechanical strength, and good adhesion to various substrates such as metals, but Pure polyester resin also has defects such as poor heat resistance, water resistance, and weather resistance. Aliphatic isocyanate has excellent performance. It is not only tough, wear-resistant and chemically resistant, but also has good flexibility and is easy to adhere to various substrates. It also provides super durability and flexibility. Aliphatic isocyanate is used as the second component and the first The components are mixed so that the prepared windshield rubber paint has the characteristics of gloss retention, non-yellowing, chemical corrosion resistance, aesthetics, protection and durability. The properties of polyester resin and aliphatic isocyanate resin are complementary. The modified resin obtained by polyester modified aliphatic isocyanate resin can have both excellent properties, and can obtain excellent heat resistance, weather resistance and water resistance. At the same time, it has excellent adhesion, mechanical strength, etc., and can endow the resin with excellent durability and flexibility.

The excellent performance of the windshield rubber paint is realized through the ratio of the first component and the second component and the combination of formulas.

Preferably, in parts by weight, the first component includes 65 parts of the polyester polyol resin, 28 parts of rutile titanium dioxide, 2.2 parts of ultraviolet absorbers, 3 parts of anti-adhesive and stain-resistant surface additives, and a leveling agent 0.3 parts, 0.5 parts of dispersant, 0.8 parts of anti-sedimentation agent, and about 0.2 parts of conventional solvents, which can be selected from esters, ether esters or aromatic solvents, and the selected solvents have no effect on the performance of the product. The solvent will eventually evaporate and will not remain in the product to participate in the reaction.

In order to further improve the weather resistance of the windshield rubber glass provided in this embodiment, in this embodiment, the linear polyester resin is selected to be fluorosilicon modified polyester resin, and fluorosilicon resin has excellent thermo-oxidative stability and weather resistance , low surface energy, hydrophobicity and anti-sticking and anti-fouling properties, etc., but the mechanical and film-forming properties of fluorosilicone resin are poor. Polyester resin has good film-forming properties, high mechanical strength, and good adhesion to various substrates such as metals, but pure polyester resin also has defects such as poor heat resistance, water resistance, and weather resistance. The properties of fluorosilicone resin and polyester resin are complementary. The modified resin obtained by fluorosilicone modified polyester can have both excellent properties, and it is expected to obtain excellent heat resistance, weather resistance, and water resistance at the same time. With excellent adhesion, mechanical strength, etc., it can endow the resin with excellent low surface energy and antifouling properties.

Titanium dioxide is a white pigment with excellent performance. Titanium dioxide products are mainly divided into two types: anatase and rutile. Anatase titanium dioxide does not have weather resistance, and generally can only be used for low-grade interior paints, plastics or other special purpose. Occasions such as papermaking, chemical fiber, denitrification catalyst, etc., while rutile titanium dioxide not only has better decolorization and hiding ability, but also has good weather resistance and anti-aging performance.

In addition, the content of polyester polyol resin and rutile titanium dioxide in the first component is high, accounting for more than 80% of the first component, while the second component is 100% polyester modified aliphatic isocyanate resin, The windshield rubber paint has a high solid content, and its resin/pigment/filler ratio is higher than that of traditional paints, which can reduce pollution, speed up operating procedures and improve efficiency.

Because ultraviolet radiation is a key factor that promotes the aging of plastics. Illumination, high temperature and humidity are the main causes of loss of gloss, fading, yellowing and chalking of paint coatings. The weather resistance of paint coatings is related to the spectral sensitivity of paint components. In this embodiment, the ultraviolet absorber is used as one of the first components. The ultraviolet absorber is a light stabilizer that can absorb sunlight and ultraviolet light in fluorescent light sources without changing itself. Thus protecting the paint coating. The kind of ultraviolet absorber has multiple, for example: benzotriazole ultraviolet absorber, benzophenone ultraviolet absorber, salicylate ultraviolet absorber and triazine ultraviolet absorber, the ultraviolet absorber of present embodiment Agent can comprise one or more in benzotriazole ultraviolet absorber, benzophenone ultraviolet absorber and triazine ultraviolet absorber; Preferred ultraviolet absorber is benzotriazole ultraviolet absorber, benzo Triazole UV absorbers include such as:

Product code: UV absorber UV-326, its chemical name: 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole;

Product code: UV absorber UV-327, its chemical name: 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole;

And UV absorber UV-328, UV absorber UV-329 and so on.

Leveling agent is a commonly used coating additive, which can promote the formation of a flat, smooth and uniform coating film during the drying and film forming process of the coating. A class of substances that can effectively reduce the surface tension of coating fluids and improve their leveling and uniformity. It can improve the permeability of the coating solution, reduce the possibility of spots and marks when brushing, increase the coverage, and make the film formation uniform and natural. Mainly surfactants, organic solvents, etc. There are many types of leveling agents, and the types of leveling agents used in different coatings are also different. According to the resin selected for the first component and the second component in this embodiment, fluorocarbon modified polyacrylate leveling agent or polyether polyester modified organosiloxane is preferred from various leveling agents As the leveling agent of this example, to improve the specific coating, the effect is better. The preferred leveling agent is a fluorocarbon modified polyacrylate leveling agent. For example: SF-677, JUST-3788, etc.

A dispersant is a surfactant that has two opposite properties of lipophilicity and hydrophilicity in the molecule. It can uniformly disperse the solid and liquid particles of inorganic and organic pigments that are difficult to dissolve in liquid, and at the same time prevent the particles from settling and agglomerating, forming an amphiphilic agent required for a stable suspension. In this embodiment, the dispersant includes one or more of polymer polyurethane dispersant, polyacrylamide and fatty acid polyethylene glycol ester. For example: DY-9006, SHYT1043, etc.

Anti-settling agent is a kind of rheology control agent for coatings, which makes the coating thixotropic and greatly increases the viscosity. In this embodiment, the anti-settling agent includes one or more of fumed silica, organic bentonite, castor oil derivatives, and N-methylpyrrolidone solution of modified polyurea.

The anti-adhesive and anti-fouling surface additives can improve the anti-adhesive and anti-fouling properties of paints and coatings. In this embodiment, the anti-adhesive and anti-fouling surface additives include polytetrafluoroethylene and silicones.

PTFE is commonly referred to as "non-stick coating" or "easy-to-clean material". This material has the characteristics of acid and alkali resistance, and various organic solvent resistance. At the same time, PTFE has the characteristics of high temperature resistance, and its friction coefficient is extremely low. Organosilicon has basic properties such as low surface tension, small viscosity-temperature coefficient, high compressibility, high gas permeability, etc., and has high and low temperature resistance, electrical insulation, oxidation resistance stability, weather resistance, flame retardant, water repellency, corrosion resistance, Non-toxic, tasteless, and physiologically inert, so it is not easy to be decomposed by ultraviolet light and ozone, and has excellent properties such as anti-sticking, lubricating, and glazing. In this embodiment, polytetrafluoroethylene and silicones are mixed to form an anti-sticking and stain-resistant surface additive, and polytetrafluoroethylene and silicones can coordinate with each other to achieve better anti-sticking and stain-resistant effects.

More specifically, in this embodiment, the ultraviolet absorber includes benzotriazoles; the leveling agent includes fluorocarbon modified polyacrylate leveling agent; the dispersant includes polymer polyurethane; the anti-settling agent includes gas phase dioxide Silicone; anti-stick and stain-resistant surface additives include polytetrafluoroethylene and silicones. According to the coordination of polyester polyol resin and polyester modified aliphatic isocyanate resin, correspondingly select the most suitable ultraviolet absorber, anti-adhesive and anti-pollution surface additive, leveling agent, dispersant and anti-sedimentation agent; The performance of windshield rubber paint is better.

In this embodiment, polyester polyol resin, rutile titanium dioxide, ultraviolet absorber, anti-adhesive and stain-resistant surface additive, leveling agent, dispersant and anti-settling agent are used as the first component, and the polyester modified Aliphatic isocyanate resin as the second component, and the polyester polyol resin in the first component includes polycaprolactone polyol 20%-25% and linear polyester resin 75%-80%, through a specific formula, The windshield rubber paint provided in this embodiment has good flexibility, high solid content, low viscosity, is more environmentally friendly, and has lower VOC; the weather resistance is greatly improved; the elasticity is good, and the elongation is high.

In the embodiment of the present invention, the polycaprolactone polyol and the linear polyester resin are mixed in the polyester polyol resin, so that the polycaprolactone polyol and the linear polyester resin are coordinated with each other, not only having good extensibility and weather resistance , but also has flexibility. In addition, in the first component, titanium dioxide is selected from rutile titanium dioxide, which also has better weather resistance. In the first component, specific ultraviolet absorbers, leveling agents, and dispersants are used , anti-sedimentation agent and anti-adhesive and anti-fouling surface additives interact closely with polyester polyol resin to further strengthen the weather resistance and flexibility of windshield rubber paint.

In addition, the second component is a polyester-modified aliphatic isocyanate resin. The modified resin has the excellent properties of polyester resin and aliphatic isocyanate resin and complements each other to obtain excellent heat resistance, weather resistance and flexibility. The selection of the second component also plays a vital role in the performance of the windshield rubber paint. Through the weather resistance and flexibility of the second component, it can be mixed with the first component in a mass ratio of 1:1. Further strengthen the weather resistance and flexibility of the windshield rubber paint.

In addition, the present embodiment also provides a method for preparing windshield rubber paint, which includes the following steps:

S1, the preparation of the first component:

In the container, 60-70 parts of polyester polyol resin, 20-30 parts of rutile titanium dioxide and 0.6-1.0 parts of anti-sedimentation agent are mixed and stirred evenly, ground to a fineness of less than 15 microns, and then Add 2-3 parts of ultraviolet absorber, 2-3 parts of anti-sticking and stain-resistant surface additives, 0.3-0.5 parts of leveling agent, and 0.2-0.5 parts of dispersant in proportion, and stir again to obtain the first component. During the preparation process, the container can be cleaned with conventional solvents, such as butyl acetate solvent. Wherein, the polyester polyol resin includes 20%-25% of polycaprolactone polyol and 75%-80% of linear polyester resin in terms of mass percentage.

S2, the preparation of the second component:

In another container take the polyester modified aliphatic isocyanate resin.

S3, paint matching:

Then prepare according to the mass ratio of the first component and the second component as 1:1, and mix the first component and the second component evenly.

The preparation method of the windshield rubber paint is simple and easy to realize. The windshield rubber paint prepared from specific raw materials and a specific ratio between raw materials has good flexibility and tolerance, and at the same time has strong adhesion, anti-fouling and anti-sticking The effect is good.

The source of raw material in the present embodiment is as follows:

Polyester polyol resins: Perstorp and Bayer

Rutile titanium dioxide: DuPont, USA

UV absorber: BASF, Germany

Anti-adhesive and anti-fouling surface additives: Sanye Chemical in the United States and TEGO in Germany

Leveling agent: Germany BYK

Dispersant: Germany BYK

Anti-settling agent: Degussa

Polyester modified aliphatic isocyanate resin: Asahi Kasei and Bayer Germany.

The physical and chemical indexes of the windshield rubber paint that the embodiment of the present invention provides are as follows:

In the following, the windshield rubber paint and the preparation method of the windshield rubber paint provided by the embodiments of the present invention will be described in detail with reference to specific examples.

Embodiment one

The raw material of the windshield rubber paint includes the first component and the second component with a mass ratio of 1:1. The first component includes in parts by weight: 60 parts of polyester polyol resin, 20 parts of rutile titanium dioxide, 2 parts of ultraviolet absorber, 2 parts of anti-sticking and stain-resistant surface additives, 0.3 parts of leveling agent, dispersant 0.2 parts and 0.6 parts of anti-settling agent, wherein the polyester polyol resin comprises 20% of polycaprolactone polyol and 80% of linear polyester resin by mass percentage. The second component is polyester modified aliphatic isocyanate resin.

The preparation method of the windshield rubber paint: prepare the first component according to the parts by weight, then add the polyester polyol resin, rutile titanium dioxide and anti-sedimentation agent into the first container and stir evenly, and grind to The fineness is less than 15 microns, then add UV absorber, anti-adhesive and anti-fouling surface additive, leveling agent and dispersant and stir evenly, and clean the first container with butyl acetate solvent. Then prepare the polyester modified aliphatic isocyanate resin that is 100% by mass in the second container as the second component, and prepare the first component and the second component according to the ratio of 1:1 by mass , Mix the first component and the second component uniformly.

Embodiment two

The raw material of the windshield rubber paint includes the first component and the second component with a mass ratio of 1:1. The first component includes in parts by weight: 65 parts of polyester polyol resin, 28 parts of rutile titanium dioxide, 2.2 parts of ultraviolet absorber, 2 parts of anti-adhesive and anti-fouling surface additives, 0.3 parts of leveling agent, dispersant 0.5 part and 0.8 part of anti-sedimentation agent, wherein, polyester polyol resin comprises polycaprolactone polyol 25% and linear polyester resin 75% by mass percentage, and this linear polyester resin is the polyester modified by fluorosilicon ester resin; UV absorber is benzotriazole; anti-adhesive and anti-fouling surface additives include polytetrafluoroethylene and silicone; leveling agent is fluorocarbon modified polyacrylate leveling agent; dispersant is high Molecular polyurethane and anti-settling agent are fumed silica. The second component is polyester modified aliphatic isocyanate resin.

The preparation method of the windshield rubber paint provided by this embodiment is the same as the preparation method of the windshield rubber paint in Example 1. Prepare according to the ratio of the raw materials of the windshield rubber paint provided in this embodiment, and then follow the windshield rubber paint of Embodiment 1 The preparation method can be prepared, and will not be described here.

Embodiment three

The raw material of the windshield rubber paint includes the first component and the second component with a mass ratio of 1:1. The first component includes by weight: 70 parts of polyester polyol resin, 30 parts of rutile titanium dioxide, 3 parts of ultraviolet absorber, 3 parts of anti-adhesive and anti-fouling surface additives, 0.5 parts of leveling agent, dispersant 0.4 part and 1.0 part of anti-settling agent, wherein, polyester polyol resin comprises polycaprolactone polyol 23% and linear polyester resin 77% by mass percent; Ester resins, UV absorbers include benzophenones and cyanoacrylates; anti-adhesive and anti-fouling surface additives include polytetrafluoroethylene and silicones; leveling agents are polyether polyester modified organosiloxanes; Dispersants include polyacrylamide and fatty acid polyethylene glycol ester; anti-settling agents include castor oil derivatives and N-methylpyrrolidone solutions of modified polyurea. The second component is polyester modified aliphatic isocyanate resin.

Embodiment four

The raw material of the windshield rubber paint includes the first component and the second component with a mass ratio of 1:1. The first component includes in parts by weight: 66 parts of polyester polyol resin, 25 parts of rutile titanium dioxide, 2.5 parts of ultraviolet absorber, 2.5 parts of anti-sticking and stain-resistant surface additives, 0.4 parts of leveling agent, dispersant 0.3 part and 0.7 part of anti-settling agent, wherein, polyester polyol resin comprises polycaprolactone polyol 22% and linear polyester resin 78% by mass percent; ester resins, UV absorbers include benzotriazoles, benzophenones and cyanoacrylates; anti-adhesive and stain-resistant surface additives include polytetrafluoroethylene and silicone; leveling agents are fluorocarbon modified poly Acrylic leveling agents; dispersants include polymer polyurethanes, polyacrylamides and fatty acid polyethylene glycol esters; anti-settling agents include fumed silica, castor oil derivatives and N-methylpyrrolidone of modified polyurea solution. The second component is polyester modified aliphatic isocyanate resin.

The embodiments described above are some, not all, embodiments of the present invention. The detailed description of the embodiments of the invention is not intended to limit the scope of the claimed invention but to represent only selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Claims (3)

1. a kind of windshield rubber paint, which is characterized in that its raw material includes the first component and the second component that mass ratio is 1:1, is pressed Parts by weight meter, first component include 60-70 parts of polyester polyol resin, 20-30 parts of rutile type titanium white, ultraviolet light 2-3 parts of absorbent, 2-3 parts of anti-stick resistant surface modifier, 0.3-0.5 parts of levelling agent, 0.2-0.5 parts of dispersing agent and anti-settling agent 0.6-1.0 parts；Described second group is divided into polyester modification aliphatic isocyanates resin, wherein the polyester polyol resin is pressed Mass percent meter includes polycaprolactone polyol 20%-25% and linear polyester resin 75%-80%；The linear polyester Resin is fluorinated silicone modified polyester resin；The anti-stick resistant surface modifier includes polytetrafluoroethylene (PTFE) and organic silicon；The purple Ultraviolet absorbers include Benzotriazole Ultraviolet Stabilizer；The levelling agent includes fluorine-carbon modified polyacrylate levelling Agent；The dispersing agent includes macromolecule polyurethane class dispersing agent；The anti-settling agent includes fumed silica.

2. windshield rubber paint according to claim 1, which is characterized in that according to parts by weight, first component includes It is 65 parts of the polyester polyol resin, 28 parts of the rutile type titanium white, 2.2 parts of the ultraviolet absorbing agent, described anti-stick 3 parts of resistant surface modifier, 0.3 part of the levelling agent, 0.5 part of the dispersing agent and 0.8 part of the anti-settling agent.

3. a kind of preparation method of windshield rubber paint, which is characterized in that be on the waiting list raw material, the raw material includes that mass ratio is 1:1 the One component and the second component, wherein first component includes 60-70 parts of polyester polyol resin, golden red according to parts by weight 20-30 parts of stone-type titanium dioxide, 2-3 parts of anti-stick resistant surface modifier, 0.3-0.5 parts of levelling agent, divides 2-3 parts of ultraviolet absorbing agent 0.2-0.5 parts of powder and 0.6-1.0 parts of anti-settling agent；Described second group is divided into polyester modification aliphatic isocyanates resin, In, the polyester polyol resin includes polycaprolactone polyol 20%-25% and linear polyester tree by mass percentage Rouge 75%-80%；And

The polyester polyol resin, the rutile type titanium white and the anti-settling agent are mixed evenly, are ground to thin Then the ultraviolet absorbing agent, the anti-stick resistant surface modifier, the levelling agent and described point is added less than 15 microns in degree Powder is again stirring for that first component is uniformly made, is then uniformly mixed first component and second component.