阅读说明：本技术 一种双组份多色喷涂渐变色涂料 (Double-component multi-color spraying gradient-color coating ) 是由 曹从伟 张文 赵浦 于 2020-10-30 设计创作，主要内容包括：本发明提出了一种双组份多色喷涂渐变色涂料及其制备方法,步骤1、将A组份光油与B组份固化剂与C组份稀释剂按照重量比为100：15：80-120的比例混合后搅拌均匀,得到混合物成品；步骤2、在温度为25±5℃,湿度为55-75％的条件下,将混合物粘度调节至8.5-9.5秒(岩田2号杯),在2.5-3.5KG的气压下喷涂在PMMA\PC复合板材上,涂层膜厚度范围为15±5μm；步骤3、将步骤2中喷涂后的复合板材在70℃的条件下烘烤60min,即得到成品,借此,本发明具有能够提高拉伸强度并且降低在热压时出现开裂的可能性的优点。(The invention provides a two-component multicolor spraying gradient coating and a preparation method thereof, step 1, the component A gloss oil, the component B curing agent and the component C diluent are mixed according to the weight ratio of 100:15: mixing at a ratio of 80-120, and stirring uniformly to obtain a mixture finished product; step 2, under the conditions that the temperature is 25 +/-5 ℃ and the humidity is 55-75%, the viscosity of the mixture is adjusted to 8.5-9.5 seconds (No. 2 cup of a rock field), the mixture is sprayed on a PMMA \ PC composite board under the air pressure of 2.5-3.5KG, and the thickness range of a coating film is 15 +/-5 mu m; and 3, baking the composite board sprayed in the step 2 for 60min at 70 ℃ to obtain a finished product, wherein the tensile strength can be improved and the possibility of cracking during hot pressing can be reduced.)

1. A two-component multi-color spraying gradient color coating is characterized by comprising A component gloss oil, B component curing agent and C component diluent, wherein the A component gloss oil is composed of ethyl acetate, acrylic resin, polyester resin, polycarbonate resin, acrylic leveling agent, fluorocarbon leveling agent, delayed polyurethane catalyst, wetting dispersant, mixed dibasic acid ester and adhesion promoter, the B component curing agent is composed of aliphatic isocyanate and butyl acetate, and the C component diluent is composed of ethyl acetate, butyl acetate and diacetone alcohol.

2. The two-component multicolor spraying gradient color coating according to claim 1, characterized in that the components A, B and C are respectively in parts by weight:

the component A gloss oil is prepared from the following raw materials in parts by weight:

the component B curing agent is composed of the following raw materials in parts by weight:

50-70 parts of aliphatic isocyanate

50-70 parts of butyl acetate

The component C diluent consists of the following raw materials in parts by weight:

30-50 parts of ethyl acetate

10-30 parts of butyl acetate

5-15 parts of diacetone alcohol.

3. The two-component multicolor spray-coating gradient-color coating according to claim 1, characterized in that the preparation method of the A-component gloss oil is as follows:

step A1, adding ethyl acetate and acrylic resin into a reaction cylinder under a cool and dry room temperature environment, and stirring at the rotating speed of 300-500rpm/min for 10-20min until the materials are uniformly mixed to obtain a premix;

step A2, sequentially adding polyester resin, polycarbonate resin, an acrylic acid leveling agent, a fluorocarbon leveling agent, a delayed polyurethane catalyst, a wetting dispersant, mixed dibasic acid ester and an adhesion promoter into the premix, and stirring at the rotating speed of 500 plus 800rpm/min for 30min until the mixture is uniformly mixed to obtain a mixture;

and A3, filtering the mixture until the detection fineness is less than or equal to 10 mu m, thus obtaining the component A gloss oil.

4. The two-component multicolor spray coating gradient color coating according to claim 1, wherein the method for filtering the mixture in the step A3 is to filter by double filter pressing of a3 μm filter element and a1 μm filter element.

5. The two-component multicolor spray coating gradient color coating according to claim 1, characterized in that the preparation method of the B-component fixing agent is that the B-component fixing agent is obtained by mixing the aliphatic isocyanate and the butyl acetate according to the weight ratio of 1:1 until the mixture is uniformly stirred.

6. The two-component multicolor spray coating gradient color coating according to claim 1, wherein the preparation method of the C component diluent is to mix ethyl acetate, butyl acetate and diacetone alcohol until the mixture is uniformly stirred to obtain the C component diluent.

7. The two-component multicolor spray coating gradient color coating according to claim 1, characterized in that the acrylic resin is Kunshan Benzhu-2858A;

the polyester resin is Guangzhou coma 4603;

the polycarbonate resin is prepared by dissolving a polycarbonate resin in a solvent such as ethanol, or a mixture thereof in a solvent such as ethanol;

the acrylic acid leveling agent is Nippon nanmu chemical LC-915;

the fluorocarbon leveling agent is Effka EFKA-3750;

the delayed polyurethane catalyst is Shanghai Deyin DY-5508;

the wetting dispersant is Effka EFKA-4010;

the adhesion promoter is modified polyester with high molecular weight of Dow LTW.

8. A preparation method of a two-component multi-color spraying gradient coating is characterized by comprising the following operation steps:

step 1, mixing the component A gloss oil, the component B curing agent and the component C diluent according to a weight ratio of 100:15:80-120, and uniformly stirring to obtain a finished product of the mixture;

step 2, adjusting the viscosity to 8.5-9.5 seconds for spraying under the conditions that the temperature is 25 +/-5 ℃ and the humidity is 55-75%, adopting No. 2 rock field), and spraying on a PMMA \ PC composite board under the air pressure of 2.5-3.5KG, wherein the thickness range of a coating film is 15 +/-5 um;

and 3, baking the composite board sprayed in the step 2 for 60min at 70 ℃ to obtain a finished product.

Technical Field

The invention belongs to the technical field of coatings, and particularly relates to a two-component multicolor spraying gradient-color coating.

Background

The rear shell of the mobile phone market manufacturer uses ABS, ABS \ PC and metal materials, and the ABS, ABS \ PC materials are most widely used due to the characteristic of easy processing of injection molding, but the hardness is second to metal. The hardness defect of a material is improved by using a photo-curing UV finishing coat! The advantages of excellent drop resistance and paint removal recycling of metal materials are also the mainstream, but the defect that metal materials interfere with network emission is gradually replaced by ABS, ABS \ PC plastic along with the advent of 4G and 5G networks. In 2019, in order to solve the problem of poor hardness of ABS and ABS/PC, PMMA/PC composite boards were developed by HUIWEI, OPPO and VIVO of large mobile phone manufacturers and board factories, and by utilizing the characteristics of high hardness and easiness in processing of PMMA, PMMA is perfectly blended with PC, so that the defect of no obstruction of 4G/5G network emission is met, and the problem of poor surface hardness of ABS and ABS/PC materials is solved. However, the electroplated layer can achieve mirror surface leveling only by matching with the photocuring UV primer, but the photocuring UV has poor tensile strength and is easy to crack when the hot press molding is carried out to the design of the 3D \4D R angle.

Disclosure of Invention

The invention provides a two-component multi-color spraying gradient-color coating which can improve the tensile strength and reduce the possibility of cracking during hot pressing.

The technical scheme of the invention is realized as follows: a two-component multi-color spraying gradient-color coating is composed of a component A gloss oil, a component B curing agent and a component C diluent, wherein the component A gloss oil is composed of ethyl acetate, acrylic resin, polyester resin, polycarbonate resin, an acrylic leveling agent, a fluorocarbon leveling agent, a delayed polyurethane catalyst, a wetting dispersant, mixed dibasic acid ester and an adhesion promoter, the component B curing agent is composed of aliphatic isocyanate and butyl acetate, and the component C diluent is composed of ethyl acetate, butyl acetate and diacetone alcohol.

As a preferred embodiment, the weight portions of the component A, the component B and the component C are respectively as follows:

the component A gloss oil consists of the following raw materials in parts by weight:

the component B is composed of the following raw materials in parts by weight:

50-70 parts of aliphatic isocyanate

50-70 parts of butyl acetate

The component C diluent consists of the following raw materials in parts by weight:

30-50 parts of ethyl acetate

10-30 parts of butyl acetate

5-15 parts of diacetone alcohol

As a preferred embodiment, the component A gloss oil is prepared by the following steps:

step A1, adding ethyl acetate and acrylic resin into a reaction cylinder under a cool and dry room temperature environment, and stirring at the rotating speed of 300-500rpm/min for 10-20min until the materials are uniformly mixed to obtain a premix;

step A2, sequentially adding polyester resin, polycarbonate resin, an acrylic acid leveling agent, a fluorocarbon leveling agent, a delayed polyurethane catalyst, a wetting dispersant, mixed dibasic acid ester and an adhesion promoter into the premix, and stirring at the rotating speed of 500 plus 800rpm/min for 30min until the mixture is uniformly mixed to obtain a mixture;

and A3, filtering the mixture until the detection fineness is less than or equal to 10 mu m, thus obtaining the component A gloss oil.

In a preferred embodiment, the method for filtering the mixture in the step A3 is a double filter pressing method using a3 μm filter element and a1 μm filter element.

As a preferred embodiment, the B component fixing agent is prepared by mixing the aliphatic isocyanate and the butyl acetate according to the weight ratio of 1:1 until the mixture is uniformly stirred, and then the B component curing agent is obtained.

As a preferred embodiment, the C component diluent is prepared by mixing ethyl acetate, butyl acetate and diacetone alcohol to be uniformly stirred to obtain the C component diluent.

In a preferred embodiment, the acrylic resin is Kunmayan U-2858A; the polyester resin is Guangzhou comegu 4603; the polycarbonate resin is prepared by dissolving the polycarbonate resin in Asahi Kasei 5651; the acrylic acid leveling agent is Nippon nanmu chemical LC-915; the fluorocarbon leveling agent is Effka EFKA-3750; the delayed polyurethane catalyst is Shanghai Deyin DY-5508; the wetting dispersant is Effka EFKA-4010; the adhesion promoter is modified polyester with high molecular weight of Dow LTW.

A preparation method of a two-component multi-color spraying gradient coating comprises the following operation steps:

step 1, mixing the component A gloss oil, the component B curing agent and the component C diluent according to a weight ratio of 100:15:80-120, and uniformly stirring to obtain a finished product of the mixture;

step 2, adjusting the viscosity to 8.5-9.5 seconds for spraying under the conditions that the temperature is 25 +/-5 ℃ and the humidity is 55-75%, and spraying on a PMMA \ PC composite board by adopting a No. 2 cup of a rock field under the air pressure of 2.5-3.5KG, wherein the thickness range of a coating film is 15 +/-5 microns;

and 3, baking the composite board sprayed in the step 2 for 60min at 70 ℃ to obtain a finished product.

After the technical scheme is adopted, the invention has the beneficial effects that:

1. selection of resin: the coating disclosed by the invention is a combination of three types of resins, the acrylic resin provides excellent adhesion to a base material and boiling water resistance, the polyester resin provides excellent leveling property and pigment color rendering property, and the polycarbonate improves the interlayer adhesion and high flexibility.

2. And (3) selecting an auxiliary agent: according to the invention, the acrylic acid and the fluorocarbon leveling agent are matched to balance the surface tension of a paint film and the wettability of the paint film on a base material, so that the coating adhesion of an electroplated layer is not influenced while the construction appearance is met. The pigment wetting dispersant is added to assist the color spreading of different pigments and prevent color floating, and the delayed polyurethane catalyst is added to prolong the application property of the paint and accelerate the curing speed of a paint film. The high molecular weight LTW polyester modified adhesion promoter promotes the adhesion of the base material and the coating.

3. After being cured for 60 minutes at 70 ℃, the coating can be electroplated and other coatings, the whole coating can pass the test standard of various large brands of mobile phones on the market at present, has no heavy metal raw materials, and meets the environmental protection requirement of RoHS instruction (< instruction on limiting the use of certain harmful components in electronic and electrical equipment >, (research of Hazardous substations)).

Detailed Description

The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

100 parts of component A, 15 parts of component B and 80-120 parts of component C

The component A comprises the following components in parts by weight:

the component B curing agent comprises the following components in parts by weight:

aliphatic isocyanates	55.00
		Acetic acid butyl ester	45.00
Total up to	100.00

Book (I)

The component C comprises the following diluents according to the formula in parts by weight:

ethyl acetate	45.00
		Acetic acid butyl ester	25.00
Diacetone alcohol	30.00
		Total up to	100.00

The preparation and spraying of the coating are carried out according to the proportion, and the specific steps are as follows:

firstly, preparing a component A:

1. under the environment of cool and dry room temperature, adding ethyl acetate and acrylic resin according to the proportion, putting into a reaction cylinder for mixing, and stirring for 10min at the revolution of 300r/min to obtain a premix;

2. adding polyester resin, polycarbonate resin, acrylic flatting agent, fluorocarbon flatting agent, delayed polyurethane catalyst, wetting dispersant, mixed dibasic acid ester and adhesion promoter into the premix, and stirring at the rotating speed of 500r/min for 30 minutes to obtain a mixture;

3. carrying out double filter pressing on the mixture by using a 3um filter element and a 1um filter element, and checking that the fineness is less than or equal to 10um to obtain a component A;

secondly, preparing a component B:

putting the aliphatic isocyanate and butyl acetate into a reaction cylinder, and uniformly mixing and stirring to obtain the component B.

Thirdly, preparing a component C:

mixing and stirring the ethyl acetate, the butyl acetate and the diacetone alcohol uniformly to obtain the component C.

Fourthly, manufacturing a finished product:

a two-component multi-color spraying gradient coating and a preparation method thereof are disclosed, wherein a component A and a component B are uniformly mixed and stirred according to the weight ratio of 100:15:80-120, the spraying viscosity (No. 2 cup in rock field) is adjusted to 8.5-9.5 under the conditions that the temperature is 25 ℃ and the humidity is 55-75%, the coating is sprayed on a PMMA \ PC composite plate under the air pressure of 2.5-3.5KG, the thickness range of the coating is 15 +/-5 mu m, the coating is prepared by baking for 60 minutes at 70 ℃, and boiling water boiling resistance and plating property testing are carried out.

Example 2

100 parts of component A, 15 parts of component B and 120 parts of component C

The component A comprises the following components in parts by weight:

the component B curing agent comprises the following components in parts by weight:

aliphatic isocyanates	55.00
		Acetic acid butyl ester	45.00
Total up to	100.00

The diluent of the component C comprises the following components in parts by weight:

ethyl acetate	45.00
		Acetic acid butyl ester	25.00
Diacetone alcohol	30.00
		Total up to	100.00

The preparation and spraying of the coating are carried out according to the proportion, and the specific steps are as follows:

secondly, preparing a component A:

1. under the environment of cool and dry room temperature, adding ethyl acetate and acrylic resin according to the proportion, putting into a reaction cylinder for mixing, and stirring for 10min at the revolution of 300r/min to obtain a premix;

2. adding polyester resin, polycarbonate resin, an acrylic leveling agent, a fluorocarbon leveling agent, a delayed polyurethane catalyst, a wetting dispersant, mixed dibasic acid ester and an adhesion promoter into the premix, and stirring at the rotating speed of 500r/min for 30 minutes to obtain a mixture;

3. carrying out double filter pressing on the mixture by using a 3um filter element and a 1um filter element, and checking that the fineness is less than or equal to 10um to obtain a component A;

secondly, preparing a component B:

putting the aliphatic isocyanate and butyl acetate into a reaction cylinder, and uniformly mixing and stirring to obtain the component B.

Thirdly, preparing a component C:

mixing and stirring the ethyl acetate, the butyl acetate and the diacetone alcohol uniformly to obtain the component C.

Fourthly, manufacturing a finished product:

a two-component multi-color spraying gradient coating and a preparation method thereof are disclosed, wherein a component A and a component B are uniformly mixed and stirred according to the weight ratio of 100:15:80-120, the mixture is adjusted to have a suitable spraying viscosity of 8.5-9.5 seconds (No. 2 cup in a rock field) under the conditions that the temperature is 25 ℃ and the humidity is 55-75%, the mixture is sprayed on a PMMA \ PC composite plate under the air pressure of 2.5-3.5KG, the thickness range of the coating film is 15 +/-5 mu m, the coating film is prepared by baking for 60 minutes at 70 ℃, and boiling water boiling resistance and plating property testing are carried out.

Test example

The results of the performance tests conducted on the above examples 1 and 2 according to the respective test standards are shown in the following table.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.