阅读说明：本技术 一种塑料件一体化涂装油漆及其制备方法和涂装方法 (Integrated coating paint for plastic parts and preparation method and coating method thereof ) 是由 唐积良 刘中宇 李继文 于 2020-04-17 设计创作，主要内容包括：一种塑料件一体化涂装油漆,包括以下重量份原料：10-35份中羟基树脂,1-2份分散剂,3-5份高色素色粉,40-55份高羟基树脂,5-15份聚酯树脂,25-30份油性环保溶剂,0.5-1份消泡剂,0.5-1份流平剂。本发明所述油漆预先形成光泽度极好的纳米级高色素色浆,纳米级高色素色浆与聚酯树脂,高羟树脂,消泡剂和流平剂等相溶后形成,其吸附力、光泽度、丰满度、成膜厚度和耐候性等各方面性能均能满足国家标准使用要求。本发明所述的塑料件一体化涂装油漆的制备方法简单,原材料易得,成本低,易用性佳。且只需进行一次喷涂和一次烘烤即可形成塑料漆膜,大幅减少油漆涂装时间,提高喷涂效率,降低VOC排放量,减少涂料用量。(The plastic part integrated coating paint comprises the following raw materials in parts by weight: 10-35 parts of medium-hydroxyl resin, 1-2 parts of dispersing agent, 3-5 parts of high-pigment powder, 40-55 parts of high-hydroxyl resin, 5-15 parts of polyester resin, 25-30 parts of oily environment-friendly solvent, 0.5-1 part of defoaming agent and 0.5-1 part of flatting agent. The paint disclosed by the invention is prepared into nanometer-level high-pigment color paste with excellent glossiness in advance, the nanometer-level high-pigment color paste is formed after being dissolved with polyester resin, high-hydroxyl resin, a defoaming agent, a leveling agent and the like, and the performances of the paint in all aspects such as adsorption force, glossiness, fullness, film forming thickness, weather resistance and the like can meet the use requirements of national standards. The preparation method of the plastic part integrated coating paint is simple, raw materials are easy to obtain, the cost is low, and the usability is good. And a plastic paint film can be formed only by one-time spraying and one-time baking, so that the paint coating time is greatly reduced, the spraying efficiency is improved, the VOC (volatile organic compound) emission is reduced, and the paint consumption is reduced.)

1. The plastic part integrated coating paint is characterized by comprising the following raw materials in parts by weight: 10-35 parts of medium-hydroxyl resin, 1-2 parts of dispersing agent, 3-5 parts of high-pigment powder, 40-55 parts of high-hydroxyl resin, 5-15 parts of polyester resin, 25-30 parts of oily environment-friendly solvent, 0.5-1 part of defoaming agent and 0.5-1 part of flatting agent.

2. The integrated paint for coating plastic parts according to claim 1, wherein the weight parts of the medium hydroxyl resin are 20-25, the weight parts of the high hydroxyl resin are 40-55, and the weight parts of the polyester resin are 10-15.

3. The integrated paint for coating plastic parts according to claim 1, wherein the weight parts of the medium hydroxyl resin are 25 to 35, the weight parts of the high hydroxyl resin are 40 to 55, and the weight parts of the polyester resin are 10 to 15.

4. The integrated paint for coating plastic parts according to claim 2, wherein the weight parts of the medium hydroxyl resin are 30-35, the weight parts of the high hydroxyl resin are 45-50, and the weight parts of the polyester resin are 10-15.

5. The paint for integrally coating plastic parts according to any one of claims 1 to 4, wherein the high-pigment toner has a particle size of a nanometer order of more than half of the total amount thereof.

6. The paint for integrally coating a plastic part according to any one of claims 1 to 4, wherein the medium hydroxyl resin is a medium hydroxyl acrylic resin.

7. The paint for integrally coating a plastic part according to any one of claims 1 to 4, wherein the high hydroxyl resin is a high hydroxyl acrylic resin.

8. A preparation method of plastic part integrated coating paint is characterized in that,

step 1, preparing raw materials according to the parts by weight of any one of claims 1 to 4, and grinding the high-pigment toner to a nanoscale particle size by using a grinder to obtain a nanoscale high-pigment toner;

step 2, feeding the medium hydroxyl resin, the dispersing agent and the nanometer level high-grade pigment toner into a reaction kettle, dispersing for 30 minutes at a high speed according to the rotating speed of 1500 rpm to form nanometer level high-grade pigment color paste,

and 3, adding high-hydroxyl resin, polyester resin, an oily environment-friendly solvent, a defoaming agent and a flatting agent into the nanoscale high-pigment color paste, and fully and uniformly stirring to obtain the plastic piece integrated coating paint.

9. The method of claim 8, wherein the grinder is a pin-type nano grinder.

10. A coating method for integrally coating paint on plastic parts is characterized in that,

step 1, spraying the plastic part integrated coating paint prepared by the preparation method of the plastic part integrated coating paint according to claim 8 or 9 on a plastic substrate, and standing and leveling for 3-5 minutes;

and 2, baking the sprayed and static leveled plastic base material at 70-80 ℃ for 50-60 minutes, cooling and standing for 72 hours to form a plastic paint film with all performances meeting the national standard requirements on the surface of the plastic base material.

Technical Field

The invention belongs to the technical field of plastic part coating paint processes, and particularly relates to plastic part integrated coating paint and a preparation method and a coating method thereof.

Background

With the development of material technology, plastics are increasingly widely applied to automobiles, the decoration and durability of the plastics can be improved by coating the plastics, the coating for the plastics generally comprises primer, colored paint and varnish, the corresponding coating process for the plastics comprises three coating procedures of primer coating, middle colored paint coating and top varnish coating, baking and cooling operation are required after each coating, the process is various and complex, and each coating and baking can discharge atmospheric VOC (volatile organic compounds) pollutants, so that the plastics have a great toxic effect on human bodies and natural environment. With the increasing environmental requirements, reducing VOC emissions is a major technical challenge facing the automotive coatings industry. The automobile refinishing paint market has the first worldwide Shimada, and the special water-based paint is adopted to carry out the water-based coating process of three-coating and one-drying, so that the next coating can be continuously coated without drying operation between coating and coating operations, and the emission of carbon dioxide and VOC is reduced to a certain extent. But still need to carry out primer coating, intermediate coating color paint and top coating varnish, and the improvement of spraying efficiency and the reduction of coating dosage are very limited. The effect of reducing VOC emission is realized by applying two automobile coating processes, namely, a primer and a middle paint are improved to synthesize a novel primer which can not use a middle coating color paint, or the raw materials of the middle paint and a finishing paint are improved to synthesize a novel finishing paint which can not use the middle coating color paint, so that an automobile paint film can meet the standard requirement on the basis of saving one main coating process. Many coating companies at home and abroad are dedicated to research on a method for finishing coating an automobile paint film by further reducing a coating process so as to reduce VOC (volatile organic compound) emission and coating process difficulty, but the adsorption capacity, the glossiness, the fullness, the film forming thickness and the weather resistance of the paint film cannot simultaneously meet the standard use requirements, particularly the glossiness and the fullness are different from the standard.

Disclosure of Invention

The invention aims to provide an integrated coating paint for plastic parts, a preparation method and a coating method thereof, wherein three coating operations of priming paint, middle paint and top varnish in a plastic part coating process are replaced by one coating operation of the integrated coating paint, so that one-time integrated coating of the plastic parts is realized on the basis that the adsorption force, glossiness, fullness, film forming thickness and weather resistance of a paint film are ensured and the standard use requirements are met, the complexity of the coating process is reduced, the paint coating time is reduced, the spraying efficiency is improved, the VOC emission is reduced, and the using amount of the paint is reduced.

The technical scheme of the invention is as follows:

the plastic part integrated coating paint is characterized by comprising the following raw materials in parts by weight: 10-35 parts of medium-hydroxyl resin, 1-2 parts of dispersing agent, 3-5 parts of high-pigment powder, 40-55 parts of high-hydroxyl resin, 5-15 parts of polyester resin, 25-30 parts of oily environment-friendly solvent, 0.5-1 part of defoaming agent and 0.5-1 part of flatting agent.

Preferably, the weight part of the medium hydroxyl resin is 20-25, the weight part of the high hydroxyl resin is 40-55, and the weight part of the polyester resin is 10-15.

Preferably, the weight part of the medium hydroxyl resin is 25-35, the weight part of the high hydroxyl resin is 40-55, and the weight part of the polyester resin is 10-15.

Preferably, the weight part of the medium hydroxyl resin is 30-35, the weight part of the high hydroxyl resin is 45-50, and the weight part of the polyester resin is 10-15.

Preferably, the particle size of the high-pigment toner is at least half of the total amount of the high-pigment toner in the order of nanometers.

Preferably, the medium-hydroxyl resin is a medium-hydroxyl acrylic resin.

Preferably, the high hydroxyl resin is a high hydroxyl acrylic resin.

A preparation method of plastic part integrated coating paint,

step 1, preparing raw materials according to the parts by weight, and grinding the high-pigment toner to a nanoscale particle size by using a grinder to obtain a nanoscale high-pigment toner;

step 2, feeding the medium hydroxyl resin, the dispersing agent and the nanometer level high-grade pigment toner into a reaction kettle, dispersing for 30 minutes at a high speed according to the rotating speed of 1500 rpm to form nanometer level high-grade pigment color paste,

and 3, adding high-hydroxyl resin, polyester resin, an oily environment-friendly solvent, a defoaming agent and a flatting agent into the nanoscale high-pigment color paste, and fully and uniformly stirring to obtain the plastic piece integrated coating paint.

Preferably, the grinder is a pin-and-rod type nano grinder.

A coating method of plastic part integrated coating paint comprises the steps of 1, spraying the plastic part integrated coating paint prepared by the preparation method of the plastic part integrated coating paint to a plastic substrate, standing and leveling for 3-5 minutes;

and 2, baking the sprayed and static leveled plastic base material at 70-80 ℃ for 50-60 minutes, cooling and standing for 72 hours to form a plastic paint film with all performances meeting the national standard requirements on the surface of the plastic base material.

Compared with the prior art, the invention has the advantages that:

the plastic piece integrated coating paint adopts the medium hydroxyl resin to be deflocculated with the nanometer level high pigment toner in advance under the steric hindrance effect of the dispersant to form the nanometer level high pigment color paste with excellent glossiness, the fullness is better after the nanometer level high pigment color paste is dissolved with the polyester resin, the glossiness and the surface weather resistance of a paint film can be further improved by adding the high hydroxyl resin, and the integrated coating paint with the performances of all aspects of adsorption, glossiness, fullness, film forming thickness, weather resistance and the like which can meet the use requirements of national standards is obtained under the assistance of auxiliary agents such as a defoaming agent, a flatting agent and the like. The preparation method of the plastic part integrated coating paint is simple, raw materials are easy to obtain, the cost is low, and the usability is good. The high-pigment powder can be replaced according to the specified color required by the paint film, and the formed nano-scale high-pigment color paste has better covering power and surface fineness compared with the common color paste, the glossiness is further enhanced, a good foundation is provided for the glossiness and fullness of the paint film to reach the standard, high-hydroxyl resin, polyester resin, an oily environment-friendly solvent, a defoaming agent and a leveling agent in the nano-scale high-pigment color paste in a specified proportion are added, and after the mixture is uniformly stirred, a finished product paint capable of being integrally coated is formed, namely the plastic part integrated coating paint. According to the coating method of the plastic piece integrated coating paint, the plastic piece integrated coating paint finished product is directly sprayed on a corresponding plastic piece, the plastic piece integrated coating paint finished product is baked for 50-60 minutes at 70-80 ℃ after being statically leveled, and is kept stand and cooled for 72 hours to obtain a paint film with the performances of adsorption capacity, glossiness, fullness, film forming thickness, weather resistance and the like which can meet the use requirements of national standards, namely, the paint film is formed only by one coating process without three coating processes of priming paint coating, middle paint coating and top varnish coating, the coating process is simple, the plastic paint film can be formed only by one spraying and one baking, the paint coating time is greatly reduced, the coating efficiency is improved, the VOC emission is reduced, and the paint consumption is reduced.

Detailed Description

In order to facilitate an understanding of the invention, the invention is described in more detail below with reference to specific examples.

The embodiment of the invention adopts the following raw materials:

medium hydroxyl resin: the medium hydroxyl acrylic resin of Dustmann, Netherlands, is available from Union commercial and trade company, Guangzhou, but is not limited to the product of the company; the medium hydroxyl acrylic resin is a resin with good solubility with polyester resin, is mainly used for increasing the adhesive force and drying speed of a paint film, but has poor glossiness and fullness.

Dispersing agent: BYK163 dispersant from Bick, Germany, is available from Shenzhen Meilan high New materials GmbH, but is not limited to the company; the dispersing agent is a high molecular weight auxiliary agent, deflocculates the high pigment color paste through steric hindrance, and simultaneously, the dispersing agent interacts with the high pigment color paste and the like to increase the transparency and the covering power of a paint film.

High-color toner: carbon black FW200, available from Oakron, Germany, is available from, but not limited to, Xinnuo high materials, Inc., Guangzhou;

high hydroxyl resin: 3037 high hydroxyl acrylic resins available from Diegon (DIC) of Japan, commercially available from cobalt Pumerchandize, Guangzhou, but not limited thereto; the high hydroxyl acrylic resin can be used for improving the glossiness of a paint film and the weather resistance of the surface of the paint film, particularly the acid and alkali resistance and the gasoline corrosion resistance, but has poor adhesion to a plastic substrate.

Polyester resin: 2803 polyester resins from Zhan new company (Allnex, Nuplex Nepets) USA, commercially available from, but not limited to, the company of Rapid commerce, Guangzhou; the polyester resin can increase the fullness (DOI), the vividness and the flexibility of a paint film, but the formed paint film is too soft and is easy to scratch.

An environment-friendly solvent: diisobutyl ketone (DIBK) from DOW chemical company (DOW), available from, but not limited to, fast commercial ltd, guangzhou city; the environment-friendly solvent is an ether ester solvent with high boiling point, low surface tension and low volatility, has good solubility on paint polymers, is not easy to crack, has high solubility on polymers in a wide range, and has good solvent release performance on paint films, so that the paint films have good fluidity and uniform coating performance when being sprayed.

Leveling agent: BYK358N leveling agent from Picker, Germany, available from, but not limited to, Liliter trades, Inc. of Dongguan; the leveling agent is used for increasing the smoothness of the surface of a paint film, improving the leveling performance in the paint spraying process, preventing the formation of a Nade vortex and improving the wettability of a plastic substrate.

Defoaming agent: BYK141 defoamer, Picker, Germany, was obtained from, but not limited to, Cihel trades, Inc., Dongguan.