A finish coat and a method for preparing the same

Abstract

The application relates to a cover light topcoat and a preparation method thereof and relates to the paint technology field. The application discloses a cover light topcoat, and the preparation raw materials include 3-5 parts of a photoinitiator, 0.5-1.5 parts of an additive, 20-35 parts of an acrylic resin, 15-35 parts of a monomer and 45-65 parts of a solvent according to mass fraction; the preparation method of the cover light topcoat comprises the following steps: mixing the photoinitiator, the additive, the acrylic resin, the monomer and the solvent to obtain the cover light topcoat. The application makes the modified acrylic resin and the monomer crosslink, interpenetrate and form a stable three-dimensional network structure through the photoinitiator, improves the mechanical strength of paint film forming, and ensures that the paint has good anti-skid effect after being formed.

Description

Technical Field

[0001] This application relates to the field of coating technology, and in particular to a topcoat and its preparation method. Background Technology

[0002] Clear coats, commonly known as varnishes, are frequently used in model making. They are typically used for consumer models to enhance the gloss of the finished product. Clear coats can be broadly categorized into automotive clear coats, exterior transparent clear coats, metallic clear coats, high-hardness glass clear coats, and so on. An ideal clear coat should be transparent, non-yellowing, UV-resistant, abrasion-resistant, and chemically resistant, possessing high gloss and high gloss retention, and suitable for various abrasion-prone surfaces, serving both decorative and protective functions. However, existing clear coats, as commonly used topcoats with fast curing rates, high surface hardness, and large shrinkage rates, suffer from low hardness and poor anti-slip properties. Summary of the Invention

[0003] To address the issues of low hardness and poor anti-slip performance of existing topcoat paints, this application provides a topcoat paint and its preparation method.

[0004] In one aspect, this application provides a topcoat.

[0005] A topcoat, by weight, is prepared from raw materials including 3-5 parts of photoinitiator, 0.5-1.5 parts of additives, 20-35 parts of acrylic resin, 15-35 parts of monomer and 45-65 parts of solvent.

[0006] This application utilizes photoinitiators to induce cross-linking and interpenetration between modified acrylic resin and monomers, forming a stable three-dimensional network structure, thereby improving the mechanical strength of the coating film and ensuring good anti-slip performance after the coating is formed.

[0007] Preferably, the raw materials for preparation include 4 parts photoinitiator, 1 part additive, 28 parts acrylic resin, 22 parts monomer and 55 parts solvent by mass.

[0008] This application, by further limiting the component ratio of the topcoat, enables the topcoat to have good physical strength and anti-slip properties.

[0009] Preferably, the photoinitiator is 184-photoinitiator.

[0010] By limiting the types of photoinitiators, this application can ensure that the raw materials form a better connection structure during the photocuring process.

[0011] Preferably, the additives include BYK-333 additive and leveling agent.

[0012] This application specifies that the additives, including BYK-333 additive and leveling agent, can ensure that the topcoat has good fluidity and can avoid the formation of an uneven layer structure after curing.

[0013] Preferably, the resin includes modified acrylic resin and nonaliphatic resin.

[0014] This application ensures that the topcoat has good physical properties by limiting the type of resin.

[0015] Preferably, the monomers include bispentaerythritol hexaacrylate, pentaerythritol triacrylate, and tripropylene glycol diacrylate.

[0016] This application, by limiting the types of the monomers, can cooperate with photoinitiators to form a better linkage structure during the photocuring process.

[0017] Preferably, the solvent includes propylene glycol methyl ether acetate, acetic acid, n-butyl acetate, and propylene glycol methyl ether.

[0018] This application ensures that the prepared topcoat has a good solid-liquid ratio by limiting the type of solvent.

[0019] Secondly, this application provides a method for preparing the aforementioned topcoat.

[0020] A method for preparing a topcoat includes the following steps: mixing a photoinitiator, an additive, an acrylic resin, a monomer, and a solvent to obtain the topcoat.

[0021] This application combines various raw materials through mixing, forming a paint without heating.

[0022] Preferably, the mixing is carried out under stirring conditions, wherein the stirring speed is 600-800 r / min and the stirring time is 20-40 min.

[0023] This application ensures that the components of the topcoat are fully and evenly mixed by limiting the mixing conditions.

[0024] In summary, this application has the following beneficial effects: 1. This application uses a photoinitiator to cause cross-linking and interpenetration between the modified acrylic resin and monomers, forming a stable three-dimensional network structure, thereby improving the mechanical strength of the coating film and ensuring that the coating has a good anti-slip effect after molding.

[0025] 2. By limiting the content of each component, this application can ensure that the coating has a good solid-liquid ratio, avoid the appearance of prominent layer structures during subsequent use, and ensure the smoothness of the coating. Detailed Implementation

[0026] The present application will be further described in detail below with reference to the embodiments.

[0027] Example 1 A method for preparing a topcoat includes the following steps: Three parts of 184-photoinitiator, 0.2 parts of BYK-333 additive, 0.3 parts of leveling agent, 10 parts of modified acrylic resin, 10 parts of nonazolamic acrylic resin, 5 parts of dipentaerythritol hexaacrylate, 5 parts of pentaerythritol triacrylate, 5 parts of tripropylene glycol diacrylate, and 45 parts of propylene glycol methyl ether acetate were mixed in a container and stirred at 700 rpm for 30 min to obtain a topcoat. The leveling agent was acrylate-modified polysiloxane, brand name: DIG 2100. The modified acrylate was purchased from Foshan Gaoming Tongde Chemical Co., Ltd., brand name: 10230. The nonazolamic acrylic resin was purchased from Changzhou Houding Chemical Co., Ltd., brand name: HD-1209.

[0028] Example 2 Five parts of 184-photoinitiator, 0.7 parts of BYK-333 additive, 0.8 parts of leveling agent, 17 parts of modified acrylic resin, 18 parts of nonazolamic acrylic resin, 12 parts of dipentaerythritol hexaacrylate, 12 parts of pentaerythritol triacrylate, 11 parts of tripropylene glycol diacrylate, and 65 parts of propylene glycol methyl ether acetate were mixed in a container and stirred at 700 rpm for 30 min to obtain a topcoat. The leveling agent was acrylate-modified polysiloxane, brand name: DIG 2100. The modified acrylate was purchased from Foshan Gaoming Tongde Chemical Co., Ltd., brand name: 10230. The nonazolamic acrylic resin was purchased from Changzhou Houding Chemical Co., Ltd., brand name: HD-1209.

[0029] Example 3 Four parts of 184-photoinitiator, 0.5 parts of BYK-333 additive, 0.5 parts of leveling agent, 14 parts of modified acrylic resin, 14 parts of nonazolamic acrylic resin, 7 parts of dipentaerythritol hexaacrylate, 8 parts of pentaerythritol triacrylate, 8 parts of tripropylene glycol diacrylate, and 55 parts of propylene glycol methyl ether acetate were mixed in a container and stirred at 600 rpm for 20 min to obtain a topcoat. The leveling agent was acrylate-modified polysiloxane, brand name: DIG 2100. The modified acrylate was purchased from Foshan Gaoming Tongde Chemical Co., Ltd., brand name: 10230. The nonazolamic acrylic resin was purchased from Changzhou Houding Chemical Co., Ltd., brand name: HD-1209.

[0030] Example 4 3.5 parts of 184-photoinitiator, 0.2 parts of BYK-333 additive, 0.8 parts of leveling agent, 10 parts of modified acrylic resin, 18 parts of nonazolamic acrylic resin, 5 parts of dipentaerythritol hexaacrylate, 5 parts of pentaerythritol triacrylate, 10 parts of tripropylene glycol diacrylate, and 55 parts of propylene glycol methyl ether acetate were mixed in a container and stirred at 800 rpm for 40 min to obtain a topcoat. The leveling agent was acrylate-modified polysiloxane, brand name: DIG 2100. The modified acrylate was purchased from Foshan Gaoming Tongde Chemical Co., Ltd., brand name: 10230. The nonazolamic acrylic resin was purchased from Changzhou Houding Chemical Co., Ltd., brand name: HD-1209.

[0031] Example 5 4.5 parts of 184-photoinitiator, 0.5 parts of BYK-333 additive, 0.7 parts of leveling agent, 15 parts of modified acrylic resin, 13 parts of nonazolamic acrylic resin, 10 parts of dipentaerythritol hexaacrylate, 5 parts of pentaerythritol triacrylate, 5 parts of tripropylene glycol diacrylate, and 65 parts of propylene glycol methyl ether acetate were mixed in a container and stirred at 700 rpm for 30 min to obtain a topcoat. The leveling agent was acrylate-modified polysiloxane, brand name: DIG 2100. The modified acrylate was purchased from Foshan Gaoming Tongde Chemical Co., Ltd., brand name: 10230. The nonazolamic acrylic resin was purchased from Changzhou Houding Chemical Co., Ltd., brand name: HD-1209.

[0032] Comparative Example 1 3.9 parts of photoinitiator, 0.1 parts of leveling agent, 34 parts of modified acrylate, 5 parts of ethyl acetate, 5 parts of butyl acetate, and 40 parts of monomer were mixed in a container and stirred at 700 r / min for 30 min to obtain a topcoat. The photoinitiator was 2-hydroxy-2-methyl-1-phenyl-1-propanone, purchased from Tianjin Jiuri Chemical Co., Ltd., product number: 1173; the leveling agent was acrylate-modified polysiloxane, brand name: DIG 2100; the modified acrylate was purchased from Foshan Gaoming Tongde Chemical Co., Ltd., brand name: 10230; and the monomer was trimethylolpropane triacrylate, purchased from Sanmu Group, brand name: TMPTA.

[0033] Comparative Example 2 3.9 parts of photoinitiator, 0.1 parts of leveling agent, 15 parts of modified acrylate, 5 parts of ethyl acrylate, 5 parts of butyl acrylate, and 10 parts of monomer were mixed in a container and stirred at 700 r / min for 30 min to obtain a topcoat. The photoinitiator was 2-hydroxy-2-methyl-1-phenyl-1-propanone, purchased from Tianjin Jiuri Chemical Co., Ltd., product number: 1173; the leveling agent was acrylate-modified polysiloxane, brand name: DIG 2100; the modified acrylate was purchased from Foshan Gaoming Tongde Chemical Co., Ltd., brand name: 10230; and the monomer was trimethylolpropane triacrylate, purchased from Sanmu Group, brand name: TMPTA.

[0034] Performance testing Performance Test 1: Viscosity test: Referring to the test standard of GB / T1723-93, under the condition of 25℃, take the coatings prepared in Examples 1-5, prepare a No. 4 viscosity cup, block the mouth of the cup with your left hand and fill the viscosity cup with the coating with your right hand, then release the left and right hands and start timing with a stopwatch. Stop the stopwatch when the coating is completely filled. The number of seconds displayed by the stopwatch is the viscosity of the paint.

[0035] Performance Test 2: Adhesion test method: The topcoat prepared in Examples 1-5 was sprayed onto 7 groups of ABS plastic sheets. After baking in a 60℃ oven for 1 minute, the sheets were cured under a UV lamp at 400-800 mj / cm2 for 5 seconds. The sheets were then vacuum electroplated with aluminum, and the topcoat was applied to the electroplated aluminum film. A grid of 100 lines was drawn on the finished ABS plastic sheet with a knife, and 3M tape was used to pull the grid lines three times. The amount of topcoat that peeled off at the grid lines was observed, and the adhesion grade was determined according to the test standard GB / T1720-1979.

[0036] Performance Test 3: Topcoat performance test: The topcoat prepared in Examples 1-5 and Comparative Examples 1-2 were sprayed onto 7 groups of ABS plastic sheets. After baking in an oven at 60°C for 1 minute, the sheets were cured under a UV lamp of 400-800 mj / cm2 for 5 seconds. The sheets were then vacuum electroplated with aluminum. After that, the topcoat was sprayed onto the electroplated aluminum film and then boiled in water at 100°C for 2 hours. After that, the coating layer and the ABS plastic sheet layer were checked for cracks. If cracks were found, the topcoat performance was recorded as poor. If no cracks were found, the topcoat performance was recorded as good.

[0037] Performance Test 4: According to GB / T 6739-2006, Examples 1-5 and Comparative Examples 1-2 were sprayed onto the surfaces of 7 groups of polished tinplate sheets, cured at 180°C for 10 minutes, and then the hardness of the coating was tested using a surface hardness tester.

[0038] Table 1 Test Results Based on Examples 1-5, Comparative Examples 1-2, and Table 1, it can be seen that the coating provided by this application has good adhesion and bonding properties, as well as good coating performance. In addition, the coating provided by this application has high hardness. Considering all factors, Example 3 of this application has the best performance.

[0039] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A topcoat, characterized in that, By weight, it includes the following raw materials: 4 parts photoinitiator, 1 part additive, 28 parts acrylic resin, 23 parts monomer and 55 parts solvent; The photoinitiator is 184-photoinitiator; The additives include 0.5 parts of BYK-333 additive and 0.5 parts of leveling agent; The resin comprises 14 parts modified acrylic resin and 14 parts nonaliphatic acrylic resin; The monomer comprises 7 parts of dipentaerythritol hexaacrylate, 8 parts of pentaerythritol triacrylate and 8 parts of tripropylene glycol diacrylate; The solvent is propylene glycol methyl ether acetate.

2. A method for preparing a topcoat according to claim 1, characterized in that, Includes the following steps: The photoinitiator, additives, acrylic resin, monomers and solvents are mixed to obtain the topcoat.

3. The preparation method according to claim 2, characterized in that, The mixing is carried out under stirring conditions, with a stirring speed of 600-800 r / min and a stirring time of 20-40 min.

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