阅读说明：本技术 一种适用于ps塑件的高附着力uv底漆及其制备方法 (High-adhesion UV primer suitable for PS plastic parts and preparation method thereof ) 是由 邹常发 程文 黄恒松 于 2021-05-17 设计创作，主要内容包括：本发明公开了一种适用于PS塑件的高附着力UV底漆及其制备方法,按照重量份计,包括以下原料：改性丙烯酸树脂18-22份、UV单体17-24份、环氧树脂10-14份、光引发剂3-6份、磷酸酯0.3-0.7份、溶剂40-45份、流平剂0.005-0.015份。本发明通过特定比例的各原料复配制备得到的UV底漆与PS塑料底材之间具有高附着力,采用特殊的改性丙烯酸树脂和两种不同结构的UV单体进行特定配比,达到了互补增效的作用,使所制备的油漆在具有高附着力的同时保证漆膜的固化速率和漆膜硬度,此外加入改性环氧丙烯酸酯增加后期镀膜层的稳定性。(The invention discloses a high-adhesion UV primer suitable for PS plastic parts and a preparation method thereof, wherein the high-adhesion UV primer comprises the following raw materials in parts by weight: 18-22 parts of modified acrylic resin, 17-24 parts of UV monomer, 10-14 parts of epoxy resin, 3-6 parts of photoinitiator, 0.3-0.7 part of phosphate, 40-45 parts of solvent and 0.005-0.015 part of flatting agent. According to the invention, the UV primer prepared by compounding the raw materials in a specific ratio has high adhesive force with a PS plastic substrate, and the special modified acrylic resin and two UV monomers with different structures are specifically matched to achieve the complementary and synergistic effects, so that the prepared paint has high adhesive force, the curing rate and hardness of a paint film are ensured, and the modified epoxy acrylate is added to increase the stability of a later-stage coating layer.)

1. The high-adhesion UV primer suitable for PS plastic parts is characterized by comprising the following preparation raw materials in parts by weight: 18-22 parts of modified acrylic resin, 17-24 parts of UV monomer, 10-14 parts of epoxy resin, 3-6 parts of photoinitiator, 0.3-0.7 part of phosphate, 40-45 parts of solvent and 0.005-0.015 part of flatting agent.

2. The UV primer with high adhesion suitable for PS plastic parts according to claim 1, wherein the modified acrylic resin is prepared from 30-50 parts by weight of multifunctional acrylate, 30-50 parts by weight of thermoplastic acrylic resin, 1-5 parts by weight of xylene and 5-15 parts by weight of butyl acetate.

3. The high-adhesion UV primer suitable for the PS plastic part according to claim 1 or 2, wherein the UV monomer comprises a UV monomer A and a UV monomer B, the functionality of the UV monomer A is 1, and the functionality of the UV monomer B is 3.

4. The high-adhesion UV primer suitable for PS plastic parts according to claim 3, wherein the weight ratio of the UV monomer A to the UV monomer B is 1: (5-6.2).

5. The UV primer with high adhesion suitable for PS plastic parts as claimed in claim 1 or 2, wherein the epoxy resin is modified epoxy acrylate, the viscosity of the modified epoxy acrylate at 25 ℃ is 50000-120000cps, and the acid value is less than or equal to 5 mgKOH/g.

6. The high adhesion UV primer for PS plastic parts according to claim 1 or 2, wherein the photoinitiator comprises one or more of benzoin dimethyl ether, 2-hydroxy-2-methyl-1-phenyl-1-propanone, 1-hydroxy-cyclohexyl-phenyl ketone, 4-dimethylamino-ethyl benzoate, and 2, 4, 6 (trimethylbenzoyl) diphenyl phosphine oxide.

7. The high-adhesion UV primer for PS plastic parts according to claim 1 or 2, wherein the solvent comprises butyl acetate and ethyl acetate in a weight ratio of 1: (2-2.5).

8. The high-adhesion UV primer suitable for PS plastic parts according to claim 1 or 2, wherein the leveling agent comprises an organosilicon leveling agent or an acrylate leveling agent.

9. The preparation method of the high-adhesion UV primer suitable for the PS plastic part according to any one of claims 1 to 8, characterized by comprising the following steps: adding the raw materials according to the formula, stirring and mixing until the raw materials are fully dissolved to obtain the composition.

10. The method for preparing the high-adhesion UV primer suitable for the PS plastic part according to claim 9, wherein the stirring conditions are as follows: the rotating speed is 600 plus 800r/min, and the stirring time is 25-35 min.

Technical Field

The invention relates to the field of UV (ultraviolet) paint, in particular to a high-adhesion UV primer suitable for PS (polystyrene) plastic parts and a preparation method thereof.

Background

Nowadays, the unit price of ABS (terpolymer of three monomers of acrylonitrile, butadiene and styrene) and PC (polycarbonate) plastics is higher, the blank cost pressure of a processing plant is large, and in comparison, the price of polystyrene (PS material) is one third lower, and the cost is greatly advantageous. At present, more and more injection molding factories gradually change ABS materials or PC materials into PS materials, so that the demand of PS materials for coatings in the market is increased. At present, a plurality of coating companies are put into research, development and application in the market, but most of the coating companies have the problems of unstable adhesive force and poor adaptability to PS plastic substrates.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides, in a first aspect, a high-adhesion UV primer suitable for PS plastic parts, which comprises the following preparation raw materials in parts by weight: 18-22 parts of acrylic resin, 17-24 parts of UV monomer, 10-14 parts of epoxy resin, 3-6 parts of photoinitiator, 0.3-0.7 part of phosphate, 40-45 parts of solvent and 0.005-0.015 part of flatting agent.

As a preferable technical scheme, the preparation raw materials of the modified acrylic resin comprise, by weight, 30-50 parts of multifunctional acrylic ester, 30-50 parts of thermoplastic acrylic resin, 1-5 parts of xylene and 5-15 parts of butyl acetate.

As a preferable technical scheme, the UV monomer comprises a UV monomer A and a UV monomer B, the functionality of the UV monomer A is 1, and the functionality of the UV monomer B is 3.

As a preferable technical solution, the weight ratio of the UV monomer a to the UV monomer B is 1: (5-6.2).

As a preferable technical scheme, the epoxy resin is modified epoxy acrylate, the viscosity of the modified epoxy acrylate at 25 ℃ is 50000-120000cps, and the acid value is less than or equal to 5 mgKOH/g.

As a preferred technical solution, the photoinitiator comprises one or more of benzoin dimethyl ether, 2-hydroxy-2-methyl-1-phenyl-1-propanone, 1-hydroxy-cyclohexyl-phenyl ketone, 4-dimethylamino-ethyl benzoate, and 2, 4, 6 (trimethylbenzoyl) diphenyl phosphine oxide.

As a preferred technical solution, the solvent comprises butyl acetate and ethyl acetate, and the weight ratio of the butyl acetate to the ethyl acetate is 1: (2-2.5).

As a preferred technical solution, the leveling agent includes an organosilicon leveling agent or an acrylate leveling agent.

The invention provides a preparation method of a high-adhesion UV primer suitable for PS plastic parts, which is characterized by comprising the following steps of: adding the raw materials according to the formula, stirring and mixing until the raw materials are fully dissolved to obtain the composition.

As a preferred technical solution, the stirring conditions are as follows: the rotating speed is 600 plus 800r/min, and the stirring time is 25-35 min.

Has the advantages that: according to the invention, the UV primer prepared by compounding the raw materials in a specific ratio has high adhesive force with a PS plastic substrate, and the special modified acrylic resin and two UV monomers with different structures are specifically matched to achieve the complementary and synergistic effects, so that the prepared paint has high adhesive force, the curing rate and hardness of a paint film are ensured, and the modified epoxy acrylate is added to increase the stability of a later-stage coating layer.

Drawings

FIG. 1 is a picture of an effect of example 1 after a paint film adhesion test;

FIG. 2 is a picture of an effect of example 2 after a paint film adhesion test;

FIG. 3 is a picture of an effect of example 3 after a paint film adhesion test;

FIG. 4 is a picture of an effect of example 4 after a paint film adhesion test;

FIG. 5 is a picture of an effect of example 5 after a paint film adhesion test;

FIG. 6 is a picture of an example of an effect obtained after a paint film adhesion test is performed in example 6;

FIG. 7 is a real image of the effect of example 7 after the paint film adhesion test.

Detailed Description

The invention will be further understood by reference to the following detailed description of preferred embodiments of the invention and the examples included therein. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. To the extent that a definition of a particular term disclosed in the prior art is inconsistent with any definition provided in the present disclosure, the definition of the term provided in the present disclosure controls.

As used herein, a feature that does not define a singular or plural form is also intended to include a plural form of the feature unless the context clearly indicates otherwise. It will be further understood that the term "prepared from …," as used herein, is synonymous with "comprising," including, "comprising," "having," "including," and/or "containing," when used in this specification means that the recited composition, step, method, article, or device is present, but does not preclude the presence or addition of one or more other compositions, steps, methods, articles, or devices. Furthermore, the use of "preferred," "preferably," "more preferred," etc., when describing embodiments of the present invention, is meant to refer to embodiments of the invention that may provide certain benefits, under certain circumstances. However, other embodiments may be preferred, under the same or other circumstances. In addition, the recitation of one or more preferred embodiments does not imply that other embodiments are not useful, nor is it intended to exclude other embodiments from the scope of the invention.

The invention provides a high-adhesion UV primer suitable for PS plastic parts, which comprises the following preparation raw materials in parts by weight: 18-22 parts of modified acrylic resin, 17-24 parts of UV monomer, 10-14 parts of epoxy resin, 3-6 parts of photoinitiator, 0.3-0.7 part of phosphate, 40-45 parts of solvent and 0.005-0.015 part of flatting agent.

Preferably, the method comprises the following preparation raw materials in parts by weight: 19-21 parts of modified acrylic resin, 18-22 parts of UV monomer, 11-13 parts of epoxy resin, 3-5 parts of photoinitiator, 0.4-0.6 part of phosphate, 42-44 parts of solvent and 0.008-0.012 part of flatting agent.

In some preferred embodiments, the modified acrylic resin is prepared from raw materials including, by weight, 30-50 parts of multifunctional acrylate, 30-50 parts of thermoplastic acrylic resin, 1-5 parts of xylene, and 5-15 parts of butyl acetate.

Preferably, the modified acrylic resin is prepared from 35-45 parts by weight of multifunctional acrylate, 38-50 parts by weight of thermoplastic acrylic resin, 2-4 parts by weight of xylene and 8-12 parts by weight of butyl acetate.

More preferably, the modified acrylic resin is prepared from 40 parts by weight of multifunctional acrylate, 47 parts by weight of thermoplastic acrylic resin, 3 parts by weight of xylene and 10 parts by weight of butyl acetate.

The multifunctional acrylic ester is tripropylene glycol diacrylate with the CAS number of 42978-66-5, and the thermoplastic acrylic resin is purchased from Kunshan Karster high molecular materials Co., Ltd, and is of the TAR 676.

The preparation method of the modified acrylic resin comprises the following steps:

(1) pre-mixing tripropylene glycol diacrylate and thermoplastic acrylic resin to obtain a mixture A;

(2) heating dimethylbenzene to 90-100 ℃;

(3) dropwise adding the mixture A into dimethylbenzene for polymerization reaction, and preserving heat for 1-3h to obtain a mixture B;

(4) adding butyl acetate, and mixing uniformly;

(5) removing redundant dimethylbenzene to obtain the product.

In some preferred embodiments, the UV monomer comprises UV monomer a and UV monomer B, the functionality of UV monomer a is 1, and the functionality of UV monomer B is 3.

In some preferred embodiments, the weight ratio of UV monomer a to UV monomer B is 1: (5-6.2).

Preferably, the weight ratio of the UV monomer A to the UV monomer B is 1: (5.5-5.7).

More preferably, the weight ratio of the UV monomer a to the UV monomer B is 1: 5.67.

further preferably, the UV monomer a is purchased from HEMA of samsung group ltd, Jiangsu, and the UV monomer B is purchased from TMPTA of samsung group ltd, Jiangsu.

In some preferred embodiments, the epoxy resin is a modified epoxy acrylate having a viscosity of 50000-120000cps at 25 ℃ and an acid number of 5mgKOH/g or less.

Preferably, the modified epoxy acrylate has a viscosity of 60000-100000cps at 25 ℃ and an acid value of 3-5mgKOH/g, and is available from Wusansynthesis chemical company Limited under the model number of UV-225.

In some preferred embodiments, the photoinitiator comprises one or more of benzoin bis methyl ether, 2-hydroxy-2-methyl-1-phenyl-1-propanone, 1-hydroxy-cyclohexyl-phenyl ketone, 4-dimethylamino-ethyl benzoate, 2, 4, 6 (trimethylbenzoyl) diphenylphosphine oxide.

Preferably, the photoinitiator comprises benzoin dimethyl ether or/and 2-hydroxy-2-methyl-1-phenyl-1-propanone.

Preferably, the photoinitiator is benzoin dimethyl ether.

The applicant has unexpectedly found that the selection of different photoinitiators in the system also has an effect on the adhesion of the paint film, and when the selected initiator is benzoin dimethyl ether, the curing speed of the primer can be accelerated, and the adhesion of the primer to the PS plastic substrate can be promoted.

In some preferred embodiments, the solvent comprises butyl acetate and ethyl acetate in a weight ratio of 1: (2-2.5).

Preferably, the solvent comprises butyl acetate and ethyl acetate, and the weight ratio of the butyl acetate to the ethyl acetate is 1: (2.1-2.3).

More preferably, the solvent comprises butyl acetate and ethyl acetate, and the weight ratio of the butyl acetate to the ethyl acetate is 1: 2.22.

in the prior art, the phenomenon that a paint film falls off easily after the UV primer is sprayed on a PS plastic substrate is caused by poor adhesion between the UV primer and the PS plastic substrate, and the applicant finds that in the research, when the specific modified acrylic resin is selected to be compounded with two UV monomers with different structures, the modified epoxy acrylate and the phosphate, the prepared UV primer has excellent adhesive force with a PS plastic substrate, the applicant considers that the possible reason is that the resins with different viscosities and functionalities generate a synergistic effect in the curing process to promote the uniform balance of crosslinking curing, meanwhile, two UV monomers with different structures are compounded in a specific proportion, and the two UV monomers generate complementary effects, particularly because the UV monomer A can increase the adhesive force of a paint film, but the curing reaction is slow, the curing speed of a paint film and the hardness of the paint film are influenced, and the defect can be compensated by adding a proper amount of UV monomer B. In addition, the solvent is compounded by adopting butyl acetate and ethyl acetate, so that the resin is dissolved more completely, different temperature gradients of a system in the using process can be met, the viscosity of the system can be adjusted, and the film forming speed of a paint film can be further improved.

In some preferred embodiments, the leveling agent comprises a silicone leveling agent or an acrylate leveling agent.

Preferably, the leveling agent is an organosilicon leveling agent, and the organosilicon leveling agent is organosilicon acrylate which can be purchased commercially and includes, but is not limited to, the organosilicon acrylate is type 2100 digao.

The invention provides a preparation method of a high-adhesion UV primer suitable for PS plastic parts, which is characterized by comprising the following steps of: adding the raw materials according to the formula, stirring and mixing until the raw materials are fully dissolved to obtain the composition.

In some preferred embodiments, the conditions of the agitation are: the rotating speed is 600 plus 800r/min, and the stirring time is 25-35 min.

Examples

In order to better understand the above technical solutions, the following detailed descriptions will be provided with reference to specific embodiments. It should be noted that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention, and that the insubstantial modifications and adaptations of the present invention by those skilled in the art based on the above disclosure are still within the scope of the present invention. In addition, the starting materials used are all commercially available, unless otherwise specified.

Example 1

The embodiment provides a high-adhesion UV primer suitable for a PS plastic part, which comprises the following preparation raw materials in parts by weight: 20 parts of modified acrylic resin, 3 parts of UV monomer A, 17 parts of UV monomer B, 12 parts of modified epoxy acrylate, 4 parts of photoinitiator, 0.5 part of phosphate, 30 parts of ethyl acetate, 13.49 parts of butyl acetate and 0.01 part of flatting agent.

The modified acrylic resin is prepared from raw materials including 40 parts of tripropylene glycol diacrylate, 47 parts of thermoplastic acrylic resin, 3 parts of xylene and 10 parts of butyl acetate.

The thermoplastic acrylic resin is purchased from Kunshan Karsted high molecular materials, Inc. and is in the model TAR 676.

The preparation method of the modified acrylic resin comprises the following steps:

(1) pre-mixing tripropylene glycol diacrylate and thermoplastic acrylic resin to obtain a mixture A;

(2) heating xylene to 95 ℃;

(3) dropwise adding the mixture A into dimethylbenzene for polymerization reaction, and keeping the temperature for 2 hours to obtain a mixture B;

(4) adding butyl acetate into the mixture B, and uniformly mixing;

(5) removing redundant dimethylbenzene to obtain the product.

The UV monomer A is purchased from HEMA of Jiangsu Sanmu group, Inc., and the UV monomer B is purchased from TMPTA of Jiangsu Sanmu group, Inc.; the viscosity of the modified epoxy acrylate at 25 ℃ is 60000-100000cps, the acid value is 3-5mgKOH/g, and the modified epoxy acrylate is purchased from Wu-Sanji chemical engineering Co., Ltd, and the model is UV-225; the photoinitiator is benzoin dimethyl ether and is purchased from Tianjin Jieshi New Material Co., Ltd; the phosphate ester is purchased from sandomar chemical company, ltd, and has the model number of CD 9051; the leveling agent is organic silicon acrylate, and the model is Digao 2100.

Another aspect of this embodiment provides a method for preparing a high adhesion UV primer suitable for a PS plastic part, including the following steps: adding the raw materials according to the formula, and stirring at the rotating speed of 750r/min for 30min until the raw materials are fully dissolved to obtain the final product.

Example 2

The embodiment provides a high-adhesion UV primer suitable for a PS plastic part, which comprises the following preparation raw materials in parts by weight: 20 parts of modified acrylic resin, 3 parts of UV monomer A, 17 parts of UV monomer B, 12 parts of modified epoxy acrylate, 4 parts of photoinitiator, 0.5 part of phosphate, 30 parts of ethyl acetate, 13.49 parts of butyl acetate and 0.01 part of flatting agent.

The modified acrylic resin is purchased from baud new materials ltd, and has the model number of BT 1070.

The UV monomer A is purchased from HEMA of Jiangsu Sanmu group, Inc., and the UV monomer B is purchased from TMPTA of Jiangsu Sanmu group, Inc.; the viscosity of the modified epoxy acrylate at 25 ℃ is 60000-100000cps, the acid value is 3-5mgKOH/g, and the modified epoxy acrylate is purchased from Wu-Sanji chemical engineering Co., Ltd, and the model is UV-225; the photoinitiator is benzoin dimethyl ether and is purchased from Tianjin Jieshi New Material Co., Ltd; the phosphate ester is purchased from sandomar chemical company, ltd, and has the model number of CD 9051; the leveling agent is organic silicon acrylate, and the model is Digao 2100.

Another aspect of this embodiment provides a method for preparing a high adhesion UV primer suitable for a PS plastic part, including the following steps: adding the raw materials according to the formula, and stirring at the rotating speed of 750r/min for 30min until the raw materials are fully dissolved to obtain the final product.

Example 3

The embodiment provides a high-adhesion UV primer suitable for a PS plastic part, which comprises the following preparation raw materials in parts by weight: 20 parts of modified acrylic resin, 3 parts of UV monomer A, 17 parts of UV monomer B, 12 parts of modified epoxy acrylate, 4 parts of photoinitiator, 0.5 part of phosphate, 30 parts of ethyl acetate, 13.49 parts of butyl acetate and 0.01 part of flatting agent.

The modified acrylic resin is purchased from Jiangsu Sanmu group Co Ltd, and has the model number of 343-3.

The UV monomer A is purchased from HEMA of Jiangsu Sanmu group, Inc., and the UV monomer B is purchased from TMPTA of Jiangsu Sanmu group, Inc.; the viscosity of the modified epoxy acrylate at 25 ℃ is 60000-100000cps, the acid value is 3-5mgKOH/g, and the modified epoxy acrylate is purchased from Wu-Sanji chemical engineering Co., Ltd, and the model is UV-225; the photoinitiator is benzoin dimethyl ether and is purchased from Tianjin Jieshi New Material Co., Ltd; the phosphate ester is purchased from sandomar chemical company, ltd, and has the model number of CD 9051; the leveling agent is organic silicon acrylate, and the model is Digao 2100.

Another aspect of this embodiment provides a method for preparing a high adhesion UV primer suitable for a PS plastic part, including the following steps: adding the raw materials according to the formula, and stirring at the rotating speed of 750r/min for 30min until the raw materials are fully dissolved to obtain the final product.

Example 4

The embodiment provides a high-adhesion UV primer suitable for a PS plastic part, which comprises the following preparation raw materials in parts by weight: 20 parts of modified acrylic resin, 3 parts of UV monomer A, 17 parts of UV monomer B, 12 parts of modified epoxy acrylate, 4 parts of photoinitiator, 0.5 part of phosphate, 30 parts of ethyl acetate, 13.49 parts of butyl acetate and 0.01 part of flatting agent.

The modified acrylic resin is prepared from raw materials including 40 parts of tripropylene glycol diacrylate, 47 parts of thermoplastic acrylic resin, 3 parts of xylene and 10 parts of butyl acetate.

The thermoplastic acrylic resin is purchased from Kunshan Karsted high molecular materials, Inc. and is in the model TAR 676.

The preparation method of the modified acrylic resin comprises the following steps:

(1) pre-mixing tripropylene glycol diacrylate and thermoplastic acrylic resin to obtain a mixture A;

(2) heating xylene to 95 ℃;

(3) dropwise adding the mixture A into dimethylbenzene for polymerization reaction, and keeping the temperature for 2 hours to obtain a mixture B;

(4) adding butyl acetate into the mixture B, and uniformly mixing;

(5) removing redundant dimethylbenzene to obtain the product.

The UV monomer A is purchased from HEMA of Jiangsu Sanmu group, Inc., and the UV monomer B is purchased from TMPTA of Jiangsu Sanmu group, Inc.; the viscosity of the modified epoxy acrylate at 25 ℃ is 90000-100000cps, the acid value is less than or equal to 1mgKOH/g, and the modified epoxy acrylate is purchased from Zhongshan Ketian electronic materials Co., Ltd, and the model is 4213; the photoinitiator is benzoin dimethyl ether and is purchased from Tianjin Jieshi New Material Co., Ltd; the phosphate ester is purchased from sandomar chemical company, ltd, and has the model number of CD 9051; the leveling agent is organic silicon acrylate, and the model is Digao 2100.

Another aspect of this embodiment provides a method for preparing a high adhesion UV primer suitable for a PS plastic part, including the following steps: adding the raw materials according to the formula, and stirring at the rotating speed of 750r/min for 30min until the raw materials are fully dissolved to obtain the final product.

Example 5

The embodiment provides a high-adhesion UV primer suitable for a PS plastic part, which comprises the following preparation raw materials in parts by weight: 20 parts of modified acrylic resin, 3 parts of UV monomer A, 17 parts of UV monomer B, 12 parts of modified epoxy acrylate, 4 parts of photoinitiator, 0.5 part of phosphate, 30 parts of ethyl acetate, 13.49 parts of butyl acetate and 0.01 part of flatting agent.

The modified acrylic resin is prepared from raw materials including 40 parts of tripropylene glycol diacrylate, 47 parts of thermoplastic acrylic resin, 3 parts of xylene and 10 parts of butyl acetate.

The thermoplastic acrylic resin is purchased from Kunshan Karsted high molecular materials, Inc. and is in the model TAR 676.

The preparation method of the modified acrylic resin comprises the following steps:

(1) pre-mixing tripropylene glycol diacrylate and thermoplastic acrylic resin to obtain a mixture A;

(2) heating xylene to 95 ℃;

(3) dropwise adding the mixture A into dimethylbenzene for polymerization reaction, and keeping the temperature for 2 hours to obtain a mixture B;

(4) adding butyl acetate into the mixture B, and uniformly mixing;

(5) removing redundant dimethylbenzene to obtain the product.

The UV monomer A is purchased from HEMA of Jiangsu Sanmu group, Inc., and the UV monomer B is purchased from TMPTA of Jiangsu Sanmu group, Inc.; the viscosity of the modified epoxy acrylate at 25 ℃ is 90000-100000cps, the acid value is less than or equal to 3mgKOH/g, and the modified epoxy acrylate is purchased from Jiangsu Sanmu group Co, Ltd, and the model is 6100D; the photoinitiator is benzoin dimethyl ether and is purchased from Tianjin Jieshi New Material Co., Ltd; the phosphate ester is purchased from sandomar chemical company, ltd, and has the model number of CD 9051; the leveling agent is organic silicon acrylate, and the model is Digao 2100.

Another aspect of this embodiment provides a method for preparing a high adhesion UV primer suitable for a PS plastic part, including the following steps: adding the raw materials according to the formula, and stirring at the rotating speed of 750r/min for 30min until the raw materials are fully dissolved to obtain the final product.

Example 6

The embodiment provides a high-adhesion UV primer suitable for PS plastic parts and a preparation method thereof, and the specific implementation manner is the same as that of embodiment 1, except that the initiator is 2-hydroxy-2-methyl-1-phenyl-1-acetone.

Example 7

The embodiment provides a high-adhesion UV primer suitable for PS plastic parts and a preparation method thereof, and the specific implementation manner is the same as that of embodiment 1, except that the initiator is a mixture of benzoin dimethyl ether and 2-hydroxy-2-methyl-1-phenyl-1-acetone.

Performance testing

1. Adhesion test

Spraying UV pretreatment agent on PS plastic substrate, respectively spraying the UV primers prepared in examples 1-7, and baking for 3min with ultraviolet energy of 900mJ/cm²Curing, vacuum plating UV finish paint, infrared baking for 3min, and ultraviolet energy of 900mJ/cm²The cured films were then tested for adhesion and the results are shown in Table 1.

The test method comprises the following steps: and drawing the hundred grids on the surface of the paint film by using a knife for three times, and observing the falling area of the paint film.

TABLE 1

Numbering	Results of adhesion
		Example 1	No paint film falling at the grid
Example 2	Part of the paint film at the grid
		Example 3	Large area of film falling at the grid
Example 4	Part of the paint film at the grid
		Example 5	Large area of film falling at the grid
Example 6	Part of the paint film at the grid
		Example 7	Part of the paint film at the grid

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined by the appended claims.