CN112680051A - High-brightness high-weather-resistance varnish for spraying automobile bumper and preparation method thereof - Google Patents

Abstract

The invention provides a high-brightness high-weather-resistance varnish for spraying an automobile bumper, which comprises a component A and a component B; the component A comprises the following components in percentage by mass: 60-80% of polyacrylic resin, 12-16% of polyester resin, 9.6-12.8% of polyurea resin, 10.1-0.5% of flatting agent, 20.5-1% of flatting agent, 0.5-1.5% of light stabilizer, 11300.5-1.5% of light absorber, 384-20.5-1.5% of light absorber and the balance of organic solvent; the component B comprises the following components in percentage by mass: 100% of water dispersible isocyanate.

Description

High-brightness high-weather-resistance varnish for spraying automobile bumper and preparation method thereof

Technical Field

The invention belongs to the field of coating materials, and particularly relates to a high-brightness high-weather-resistance varnish for spraying an automobile bumper and a preparation method thereof.

Background

With the rapid development of modern economy, automobiles have become a popular modern vehicle. As the automobile coating used as the automobile coat, the color quality, the appearance, the distinctness of image, the gloss and other advantages and disadvantages of the paint film are visual evaluations of the automobile quality, and the automobile coating can directly determine the grade of the automobile and influence the competitiveness of the automobile market. In addition, the automobile paint coating is also one of the main measures for improving the corrosion resistance of automobile products and prolonging the service life of automobiles. Based on the requirements of the automobile industry on the performance of the automobile paint, such as high requirement, multiple varieties, large consumption, and the need of having unique construction performance and coating performance, the automobile paint has long been a special paint. In developed countries of the automotive industry, automotive coatings dominate the technical development of industrial coatings, generally accounting for 15% -20% of the total coating yield, so the influence of the automotive coatings on the coating industry is also of great importance, and the automotive coatings are the coating varieties of which the coating industries focus on in all countries of the world and are advanced and dominant in technical development. World automotive coatings have achieved four major generations in the last hundred years. From oily nitrolacquers (automotive lacquers) to synthetic resin coatings based on alkyds and phenolics, to electrophoretic coatings and high-quality synthetic resin (epoxy, amino alkyds, acrylic, polycol, polyurethane a) coatings to environmentally friendly coatings, etc. Automotive coatings are required to have not only excellent protection for vehicle bodies but also pleasing appearance characteristics to meet the needs of different consumers. To achieve this, automotive coatings often employ multi-coat systems, each of which is provided with a specific function.

Compared with the patent CN201710890260.4, the patent CN201710890260.4 discloses a high-solid low-viscosity automobile bumper varnish, a preparation method and a use method, wherein hydroxyl acrylic resin is taken as a main material, and SCA resin is introduced to ensure the sagging property of the product and ensure the fullness of the varnish; adding an organosilicon BYK-315N type leveling agent and an acrylic acid BYK-390 type leveling agent to ensure the distinctness of image and the surface leveling of a paint film, and using a triazole and a hindered amine ultraviolet absorber to ensure the excellent weather resistance of a paint film coating. The addition of the drier accelerates the curing reaction of the blocked isocyanate. The matching of diacetone alcohol, propylene glycol methyl ether acetate, xylene and butyl acetate realizes balanced volatilization gradient on the basis of meeting the dissolving power, and ensures good appearance effect of the product. Compared with the prior art, the varnish of the invention has good weather resistance, excellent matching property, good dispersibility during spraying, good leveling property, moderate thixotropy and uniform coating; the paint film surface has smooth and plump leveling and good glossiness.

Disclosure of Invention

The natural environment-friendly varnish for the automobile bumper is prepared by matching polyacrylic resin, polyester resin and polyurea resin and matching a compounded flatting agent, so that the formula is simplified, and a good effect is realized.

In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows:

a high-brightness high-weather-resistance varnish for spraying an automobile bumper comprises a component A and a component B; the component A comprises the following components in percentage by mass: 60-80% of polyacrylic resin, 12-16% of polyester resin, 9.6-12.8% of polyurea resin, 10.1-0.5% of flatting agent, 20.5-1% of flatting agent, 0.5-1.5% of light stabilizer, 11300.5-1.5% of light absorber, 384-20.5-1.5% of light absorber and the balance of organic solvent; the component B comprises the following components in percentage by mass: 100% of water dispersible isocyanate.

Further, the mass ratio of the component A to the component B is 100: 20.

Further, the polyacrylic acid resin: polyester resin: polyurea resin =5:1: 0.8.

Further, the leveling agent 1 is BYK361, the leveling agent 2 is BYK390, and the ratio of the two is 1: 2.

Further, the polyester resin is neopes 1715, and the polyurea resin is asparagus 520.

Further, comprises a component A and a component B; the component A comprises the following components in percentage by mass: 70% of polyacrylic resin, 14% of polyester resin, 11.2% of polyurea resin, 10.3% of flatting agent, 20.6% of flatting agent, 1% of light stabilizer, 11301% of light absorber, 384-21% of light absorber and the balance of organic solvent; the component B comprises the following components in percentage by mass: 100% of water dispersible isocyanate.

A preparation method of high-brightness high-weather-resistance varnish for spraying automobile bumpers comprises the following steps:

(1) the component A comprises the following components in percentage by mass: 60-80% of polyacrylic resin, 12-16% of polyester resin, 9.6-12.8% of polyurea resin, 10.1-0.5% of flatting agent, 20.5-1% of flatting agent, organic solvent, temperature of 40-50 ℃, dispersion speed of 1000-1500 r/min, dispersion time of 60 minutes, addition of 0.5-1.5% of light stabilizer, 11300.5-1.5% of light absorber, 384-20.5-1.5% of light absorber, dispersion speed of 1000-1500 r/min, dispersion time of 60 minutes;

(2) before use, the components A and B are mixed uniformly according to a proportion and then are coated on a base material uniformly.

The invention has the beneficial effects that: the varnish disclosed by the invention has the characteristics of environmental friendliness, simple formula, outstanding effect, high brightness and high weather resistance, and meets various indexes.

According to the invention, the leveling agent 1 and the leveling agent 2 are added in the early stage and are mixed and dispersed with resin, so that the leveling property of the paint is improved, which is mainly reflected in that orange peel data Lw is reduced by 5-10 and Sw is reduced by 5-10.

According to the invention, a plurality of resins are matched and mixed, the polyurea resin is added into the formula, the weather resistance is improved to more than 4000h, the gloss is improved to more than 5, and the varnish can be dried without using a drier in the formula system.

Detailed Description

The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Any modifications that can be easily made by a person skilled in the art to the present invention without departing from the technical solutions of the present invention will fall within the scope of the claims of the present invention.

Component A

Polyacrylic resin (Mitsubishi chemical 7928)

Polyester resin (Nepetce 1715)

Polyurea resin (cochinchnese asparagus root 520)

Leveling agent 1 (BYK 361)

Leveling agent 2 (BYK 390)

Light stabilizer (292)

Light absorbing agent 1130

Light absorbing agent 384-2

Organic solvent ethanol.

Example 1

A high-brightness high-weather-resistance varnish for spraying an automobile bumper comprises a component A and a component B; the component A comprises the following components in percentage by mass: 70 percent of polyacrylic resin, 14 percent of polyester resin, 11.2 percent of polyurea resin, 10.3 percent of flatting agent, 20.6 percent of flatting agent and the balance of organic solvent, wherein the temperature is 45 ℃, the dispersion rotating speed is 1300 r/min, the dispersion time is 60 minutes, 1 percent of light stabilizer, 11301 percent of light absorbent, 384-21 percent of light absorbent, the dispersion rotating speed is 1300 r/min, and the dispersion time is 60 minutes; the component B comprises the following components in percentage by mass: 100% of water dispersible isocyanate.

The mass ratio of the component A to the component B is 100: 20.

Example 2

A high-brightness high-weather-resistance varnish for spraying an automobile bumper comprises a component A and a component B, wherein the component A comprises: 60% of polyacrylic resin, 16% of polyester resin, 9.6% of polyurea resin, 10.5% of flatting agent, 20.5% of flatting agent, organic solvent, dispersing at 50 ℃, at the rotating speed of 1000 r/min for 60 minutes, adding 1.5% of light stabilizer, 11300.5% of light absorber, 384-21.5% of light absorber, at the rotating speed of 1000 r/min for dispersing for 60 minutes; the component B comprises: 100% of water dispersible isocyanate.

The mass ratio of the component A to the component B is 100: 20.

Example 3

A high-brightness high-weather-resistance varnish for spraying an automobile bumper comprises a component A and a component B, wherein the component A comprises: 80% of polyacrylic resin, 12% of polyester resin, 12.8% of polyurea resin, 10.1% of flatting agent, 21% of flatting agent, organic solvent, the temperature is 40 ℃, the dispersion speed is 1500 r/min, the dispersion time is 60 minutes, 0.5% of light stabilizer, 11301.5% of light absorber, 384-20.5% of light absorber are added, the dispersion speed is 1500 r/min, and the dispersion time is 60 minutes; the component B comprises: 100% of water dispersible isocyanate.

The mass ratio of the component A to the component B is 100: 20.

Comparative example 1

Same as example 1 except that no polyurea resin was added.

Comparative example 2

Same as example 1 except that no polyester resin was added.

Comparative example 3

Same as example 1 except that leveling agent 1 was not added.

Comparative example 4

Same as example 1 except that the leveling agent 2 was not added.

The test method comprises the following steps: after coating varnish on an ABS substrate, enabling the thickness of a varnish dry film to reach 30 micrometers, leveling for 8 minutes, baking at 90 ℃ for 30-45 minutes, and then taking off the line for testing.

The test results are given in the following table:

。

Claims (7)

1. the high-brightness high-weather-resistance varnish for spraying the automobile bumper is characterized in that: comprises a component A and a component B; the component A comprises the following components in percentage by mass: 60-80% of polyacrylic resin, 12-16% of polyester resin, 9.6-12.8% of polyurea resin, 10.1-0.5% of flatting agent, 20.5-1% of flatting agent, 0.5-1.5% of light stabilizer, 11300.5-1.5% of light absorber, 384-20.5-1.5% of light absorber and the balance of organic solvent; the component B comprises the following components in percentage by mass: 100% of water dispersible isocyanate.

2. The high-brightness high-weatherability varnish for spray coating of automobile bumpers according to claim 1, characterized in that: the mass ratio of the component A to the component B is 100: 20.

3. The high-brightness high-weatherability varnish for spray coating of automobile bumpers according to claim 1, characterized in that: the polyacrylic acid resin: polyester resin: polyurea resin =5:1: 0.8.

4. The high-brightness high-weatherability varnish for spray coating of automobile bumpers according to claim 1, characterized in that: the leveling agent 1 is BYK361, and the leveling agent 2 is BYK390, and the ratio of the two is 1: 2.

5. The high-brightness high-weatherability varnish for spray coating of automobile bumpers according to claim 1, characterized in that: the polyester resin is neopes 1715, and the polyurea resin is asparagus 520.

6. The high-brightness high-weatherability varnish for spray coating of automobile bumpers according to claim 1, characterized in that: comprises a component A and a component B; the component A comprises the following components in percentage by mass: 70% of polyacrylic resin, 14% of polyester resin, 11.2% of polyurea resin, 10.3% of flatting agent, 20.6% of flatting agent, 1% of light stabilizer, 11301% of light absorber, 384-21% of light absorber and the balance of organic solvent; the component B comprises the following components in percentage by mass: 100% of water dispersible isocyanate.

7. A preparation method of high-brightness high-weather-resistance varnish for spraying automobile bumpers is characterized by comprising the following steps:

(1) the component A comprises the following components in percentage by mass: 60-80% of polyacrylic resin, 12-16% of polyester resin, 9.6-12.8% of polyurea resin, 10.1-0.5% of flatting agent, 20.5-1% of flatting agent, organic solvent, temperature of 40-50 ℃, dispersion speed of 1000-1500 r/min, dispersion time of 60 minutes, addition of 0.5-1.5% of light stabilizer, 11300.5-1.5% of light absorber, 384-20.5-1.5% of light absorber, dispersion speed of 1000-1500 r/min, dispersion time of 60 minutes;

(2) before use, the components A and B are mixed uniformly according to a proportion and then are coated on a base material uniformly.