阅读说明：本技术 一种特效反光涂料及其制备方法 (Special-effect reflective coating and preparation method thereof ) 是由 朱忠敏 喻业茂 李白 金一峰 宋超 于 2019-11-25 设计创作，主要内容包括：本发明涉及一种特效反光涂料及其制备方法,包括以下组分和重量份含量：反光粉20-40份、分散剂2-4份、溶剂19-27份、纤维素树脂31-37份、丙烯酸树脂18-24份、流平剂0.4-0.8份、防沉剂0.8-1.3份。本发明主要采用粒径较粗反光粉,制得的反光涂料反光效果强、遮盖力佳、施工方便,适用于不同的底材,可以将反光涂料单独使用,也可加入色母中混合调色,夜晚灯光照射反光漆部件的表面时产生明显的反光效应,起到安全提示作用。可广泛用于汽车零部件、道路工程、交通标识牌、户外广告标识牌、高速公路收费站、地下停车场等反光涂装。(The invention relates to a special-effect reflective coating and a preparation method thereof, wherein the special-effect reflective coating comprises the following components in parts by weight: 20-40 parts of reflective powder, 2-4 parts of dispersing agent, 19-27 parts of solvent, 31-37 parts of cellulose resin, 18-24 parts of acrylic resin, 0.4-0.8 part of flatting agent and 0.8-1.3 parts of anti-settling agent. The invention mainly adopts the reflective powder with thicker particle size, the prepared reflective coating has strong reflective effect, good covering power and convenient construction, is suitable for different substrates, can be used independently, can also be added into color master for mixing and color matching, generates obvious reflective effect when the light irradiates the surface of the reflective paint component at night, and plays a role in safety prompt. The coating can be widely used for the reflective coating of automobile parts, road engineering, traffic signboards, outdoor advertising signboards, expressway toll stations, underground parking lots and the like.)

1. The special-effect reflective coating is characterized by comprising the following components in parts by weight: 20-40 parts of reflective powder, 2-4 parts of dispersing agent, 19-27 parts of solvent, 31-37 parts of cellulose resin, 18-24 parts of acrylic resin, 0.4-0.8 part of flatting agent and 0.8-1.3 parts of anti-settling agent.

2. The special-effect reflective coating according to claim 1, wherein the reflective powder is glass microsphere powder material with particle size of 25-150 μm and chemical component of SiO₂、CaO、Na₂O、TiO₂And/or BaO.

3. The special-effect reflective coating according to claim 1, wherein the dispersing aid is an organic dispersing agent, and the chemical structure of the dispersing aid is that organic siloxane with high compatibility is added into partial polyamide and high molecular unsaturated carboxylate, or phosphate ester or ammonium phosphate.

4. The special-effect reflective coating according to claim 1, wherein the solvent is an ester solvent, a ketone solvent, an aromatic hydrocarbon solvent or an alcohol solvent, preferably one or more of ethyl acetate, butyl acetate, propylene glycol methyl ether acetate, butanone, cyclohexanone, isophorone, toluene, xylene, propanol or butanol.

5. The special effect retroreflective paint of claim 1 wherein the cellulose resin is cellulose acetate butyrate.

6. The special-effect reflective coating according to claim 1, wherein said acrylic resin is a single component acrylic resin having a hydroxyl value of 2 or less.

7. The special-effect reflective coating according to claim 1, wherein said leveling agent is an acrylic or silicone leveling agent.

8. The special-effect reflective coating according to claim 1, wherein said anti-settling agent is a polymeric polyamide wax.

9. The method for preparing the special effect reflective coating according to any of claims 1 to 8, comprising the steps of:

(1) mixing the reflective powder and 50-80 wt% of solvent, stirring uniformly, wetting and soaking;

(2) adding cellulose resin, acrylic resin, a dispersing agent and the rest solvent into the mixture, and uniformly mixing and dispersing;

(3) and adding a leveling agent and an anti-settling agent, uniformly stirring, adjusting to proper viscosity by using a solvent, and filtering to prepare the special-effect reflective coating.

10. The method for preparing the special-effect reflective coating according to claim 9,

soaking for 12-16hr in step (1);

step (2) stirring for 20-40min at 1000-;

and (3) stirring for 3-7min at 600-800rpm by using a high-speed dispersion machine.

Technical Field

The invention relates to the field of coatings, in particular to a special-effect reflective coating and a preparation method thereof.

Background

The reflecting powder is produced by a glass bead powder material, and the main component of the reflecting powder is SiO₂，CaO，Na₂O，TiO₂And BaO and the like. The reflective powder is divided into three refractive indexes, namely: ND is more than or equal to 1.90, ND is more than or equal to 1.93, ND is more than or equal to 2.2, the specification is from 100 meshes to 1000 meshes, and the color is silver gray and white for selection. The reflecting material product adopts the back half surface aluminized of high-refractive-index glass beads as a retroreflector, has extremely strong reverse retro-reflection performance, can directly reflect most light rays to the light source, and can ensure that drivers and night operators with light sources can clearly see pedestrians and obstacle targets at night or under the condition of poor vision, thereby ensuring the safety of both parties.

The reflective powder is a core raw material for producing novel optical function composite materials such as reflective cloth, reflective sticking film, reflective coating, reflective label, advertising material, clothing material, standard track, shoes and hats, schoolbag, water, land and air life-saving article and the like. The high-refraction reflecting powder has the characteristic of retro-reflection, generates a strong retro-reflection effect, does not need an external power supply, can be widely applied to the fields of roads, ports, mines, fire fighting and the like, is used as a safety sign, and greatly improves the safety and reliability of users. The reflective film can be produced by a coating machine, and the reflective clothes can be produced by screen printing. All the existing license plates adopt the light reflecting effect, and the number of the license plate can be clearly seen at night by people. The light-reflecting license plate is actually made of light-reflecting powder, and the numbers on the license plate can be seen very clearly by utilizing the characteristic of strong light reflection of the light-reflecting powder as long as the light is directly irradiated on the license plate. The automobile decorative strip is provided with a reflective scratch-resistant strip, and reflective powder is injected into plastic rubber to achieve a reflective special effect.

The countries for producing the reflective powder mainly comprise the United states, Japan and China. Other countries have very few productions because the product is a high energy consuming industry. Applications are generally limited to retroreflective sheeting, retroreflective garments. The use of the reflective powder is greatly influenced by lattice products at present, and a plurality of products using the reflective powder are increasingly replaced by reflective lattices, for example, a reflective film has a full-angle microprism reflective technology, and the reflective film has the advantages of high reflective brightness, environmental protection, long service life and the like. From the analysis of the market conditions, and the newly issued standards of the reflecting marks of the vehicle bodies, the reflecting marks are required to be attached to large trucks, and the reflecting film is required to be more than ten thousand square meters every year. The market of civil reflecting materials is huge and is not quantifiable. However, for a long time, the market of reflective materials in China is monopolized by imported products, especially high-strength reflective films. Because the technical content of the reflective film is high, imported products are sold at high price in China, and a great deal of profit is obtained. The popularization and application of the reflective film in China are restricted by a large amount of foreign exchange expenditure, which forms a great contrast with the high-speed development of national economy in China, and is very unfavorable for the development of national economy in China, especially the development of road traffic safety career.

The reflective coating product is made of the reflective powder, and when a spotlight irradiates the surface of the paint at night or under the condition of poor light, more than 90% of light sources (such as automobile light) can be reflected by the special reflective powder contained in the reflective paint to form a reflective effect. The reflective paint is generally suitable for underground parking lot marking, roadside anti-collision piers, isolation barriers and the like. However, the reflective coating is produced by only a few manufacturers, and the difficulties of uneven reflective effect and covering power, stable dispersion and settlement prevention are difficult.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, provide a special-effect reflective coating and a preparation method thereof, and solve the technical problems of poor reflective effect and covering power, unstable dispersion and easy sedimentation in the prior art.

The purpose of the invention can be realized by the following technical scheme:

the special-effect reflective coating comprises the following components in parts by weight: 20-40 parts of reflective powder, 2-4 parts of dispersing agent, 19-27 parts of solvent, 31-37 parts of cellulose resin, 18-24 parts of acrylic resin, 0.4-0.8 part of flatting agent and 0.8-1.3 parts of anti-settling agent.

Said counterThe optical powder is glass microsphere powder material with particle diameter of 25-150 μm and chemical component of SiO₂、CaO、Na₂O、TiO₂And/or BaO, which is selected from one or more of reflective powder 1028 in Dongguan haoyai chemical industry, reflective powder 35H in Zhenshen flourishing effect pigment, reflective powder white and gray in Shenzhen flourishing effect pigment, and reflective powder A-2#, 8250#, 600#, 350# in Xiamen flourishing effect pigment.

The dispersing auxiliary agent is an organic dispersing agent, the chemical structure of the dispersing auxiliary agent is that organic siloxane with high compatibility is added into partial polyamide and macromolecular unsaturated carboxylate, or phosphate ester and ammonium phosphate salt, and the dispersing auxiliary agent is selected from one or more of S18, LuboRun 36600, Elementis 9250 and Nuosperse FX 9360 which are sold in the market and have the models of Shanghai core new material science and technology.

The solvent is an ester solvent, a ketone solvent, an aromatic hydrocarbon solvent or an alcohol solvent.

Further, the solvent is selected from one or more of ethyl acetate, butyl acetate, propylene glycol methyl ether acetate, butanone, cyclohexanone, isophorone, toluene, xylene, propanol or butanol.

The cellulose resin is cellulose acetate butyrate selected from one or more of the commercially available models of Istman CAB 381-1, CAB 381-2, CAB 381-0.2 and CAB 381-0.5.

The acrylic resin is a single-component acrylic resin with a hydroxyl value less than or equal to 2.

The leveling agent is acrylic acid or organic silicon leveling agent.

The anti-settling agent is a high-molecular polyamide wax, and can adopt a commercially available model namely Disibulon 6900.

The preparation method of the special-effect reflective coating comprises the following steps:

(1) mixing reflecting powder with 50-80 wt% solvent, stirring, wetting and soaking for 12-16 hr;

(2) adding cellulose resin, acrylic resin, a dispersing agent and residual solvent into the mixture, and stirring for 20-40min at 1000-1400rpm by using a high-speed dispersion machine so as to uniformly mix and disperse;

(3) adding a leveling agent and an anti-settling agent, stirring for 3-7min at 800rpm under 600-.

And (2) dispersing the pigment at a high speed by stirring, opening pigment aggregates, and stirring at a high speed, wherein the step (3) is to uniformly mix the color paste, the leveling agent and the anti-settling agent and perform conventional stirring.

The reflective paint spraying construction method comprises the following steps: (1) cleaning the surface of an object to be sprayed, spraying a middle coating primer, spraying a 1K reflective primer for priming, spraying a 1K reflective finish after the reflective primer is dried, spraying a 2K varnish after the reflective primer is dried, drying, and polishing. If the cement surface is constructed, the effect of spraying two layers of reflective primer is better; (2) it is recommended to use a large-caliber spray gun to avoid gun blockage, and the pressure of the spray gun for priming paint is 2.0Kg/cm²About, the pressure of a finish paint spray gun is 3.0kg/cm²Left and right; (3) during construction, the spray gun and the surface need to be kept at 18cm, the angle of the spray gun is 45 degrees, the sprayed paint film layer needs to be thin, and the obtained effect is good. For an unknown substrate, a small-area trial is needed in advance; (4) the construction is not required in severe weather such as rain, fog and snow, and the fastness is affected. Use notes: (1) before use, the construction surface needs to be cleaned, and the surface needs to be dry and free of oil stains; (2) the reflective primer and the reflective finish must be stirred uniformly before construction; stirring is not stopped during the paint spraying process to prevent the reflective powder from precipitating.

According to the light reflection principle, when light irradiates the surfaces of the microbeads, the light is condensed on the special reflection layer at the focus of the microbeads due to the high refraction effect of the microbeads, and the reflection layer reflects the light to the vicinity of the light source again through the transparent microbeads, so that very bright reflected light can be seen at the light source. According to the calculation of a complex optical formula, when the refractive index of the microsphere is more than 1.9, a good retro-reflection effect can be formed. The reflecting powder is a core element for producing novel luminous functional composite materials such as reflecting cloth, reflecting leather, reflecting film, reflecting paint and the like, and has the characteristic of reflecting light and generates stronger reflecting effect.

The reflective coating of the invention has retro-reflective effect, can be used on surfaces with various complex shapes, and is suitable for reflective coating of automobile parts, road engineering (stone piers, cement surfaces, deceleration strips and the like), traffic signboards, outdoor advertising signboards, highway toll stations, underground parking lots and the like. The invention adopts particle sizes with different thicknesses to obtain various reflecting effects, the thicker the particle size is, the better the reflecting effect is, the invention selects reflecting powder with thicker particle size, the reflecting pigment is the main component, the addition amount of the pigment is more than that of the pigment of the common coating, mainly the deviation of tinting strength and covering power is determined by the larger chemical structure and particle size, and therefore, the use amount needs to be increased. If the addition amount is too small, the coloring and covering capability is poor, the light reflecting effect is not obvious, if the addition amount is too large, the waste and the cost are increased, the gloss of a paint film is influenced, the content of the corresponding dispersing auxiliary agent is slightly more than that of the conventional paint, and because the pigment is more, more dispersing groups are correspondingly needed to achieve the ideal dispersing effect.

The dispersing assistant is prepared by adding organic siloxane with high compatibility, or phosphate, ammonium phosphate, and reflecting powder glass microsphere powder (SiO)₂、CaO、Na₂O、TiO₂And/or BaO) has a good dispersion stabilizing effect, is matched with an anti-settling agent, namely high-molecular polyamide wax, so as to form a grid structure, has a thixotropic effect, and prevents hard settling. The steric hindrance of the pigment is further improved through the synergistic effect of the components, so that the pigment is uniformly dispersed in the resin, and the tinting strength, the covering power and the light reflecting effect are further improved.

The invention adopts the formula components similar to the refinishing paint color master batch, has strong light reflecting effect, good covering power and convenient construction, and is suitable for different substrates. The reflective coating can be used independently, can also be added into color master to mix and color, is used when components such as reflective labels, automobile bumpers, hubs, rearview mirrors, anti-collision strips and the like are sprayed and changed in color, has the color and the covering effect of colored paint after mixing, and also has the reflective characteristic. Because the interference effect of sunlight is not obvious daytime, when light is darker at night, the peripheral light of coming the car produces obvious reflection of light effect when shining the surface of reflectorized paint part, plays the effect of safe suggestion, anticollision scraping, reducible car driving accident at night.

Detailed Description

The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.

The special-effect reflective coating comprises the following components in parts by weight: 20-40 parts of reflective powder, 2-4 parts of dispersing agent, 19-27 parts of solvent, 31-37 parts of cellulose resin, 18-24 parts of acrylic resin, 0.4-0.8 part of flatting agent and 0.8-1.3 parts of anti-settling agent.

In the raw materials, the adopted reflective powder is glass microsphere powder material with the particle size of 25-150 μm and the chemical component of SiO₂、CaO、Na₂O、TiO₂And/or BaO, which is selected from one or more of reflective powder 1028 in Dongguan haoyai chemical industry, reflective powder 35H in Zhenshen flourishing effect pigment, reflective powder white and gray in Shenzhen flourishing effect pigment, and reflective powder A-2#, 8250#, 600#, 350# in Xiamen flourishing effect pigment.

The used dispersing auxiliary agent is an organic dispersing agent, the chemical structure of the dispersing auxiliary agent is that organic siloxane with high compatibility is added into partial polyamide and macromolecular unsaturated carboxylate, or phosphate ester and ammonium phosphate salt are selected from one or more of S18, LuboRun 36600, Elementis 9250 and Nuosperse FX 9360 which are sold in the market and are made of Shanghai core new material science and technology.

The solvent is ester solvent, ketone solvent, aromatic hydrocarbon solvent or alcohol solvent, and can adopt one or more of ethyl acetate, butyl acetate, propylene glycol methyl ether acetate, butanone, cyclohexanone, isophorone, toluene, xylene, propanol or butanol.

The cellulose resin is cellulose acetate butyrate selected from one or more of commercially available models of Istman CAB 381-1, CAB 381-2, CAB 381-0.2 and CAB 381-0.5.

The acrylic resin is a single component of acrylic resin with the hydroxyl value less than or equal to 2.

The flatting agent is acrylic acid or organic silicon flatting agent.

The anti-settling agent is high molecular polyamide wax, and can be commercially available type Disbamon 6900.

The preparation method of the special-effect reflective coating comprises the following steps:

(1) mixing reflecting powder with 50-80 wt% solvent, stirring, wetting and soaking for 12-16 hr;

(2) adding cellulose resin, acrylic resin, a dispersing agent and residual solvent into the mixture, stirring for 20-40min at 1000-1400rpm by using a high-speed dispersion machine, and opening pigment aggregate so as to uniformly mix and disperse;

(3) adding a leveling agent and an anti-settling agent, stirring for 3-7min at 800rpm under 600-.

The following are more detailed embodiments, and the technical solutions and the technical effects obtained by the present invention will be further described by the following embodiments.