A 3D printing panel coating and its preparation method and application

Abstract

This invention discloses a 3D printing panel coating, its preparation method, and its application, belonging to the field of PU coating technology. The 3D printing panel coating of this invention includes a primer and a topcoat; the primer includes component A and component B; the topcoat includes component C and component D; component A, by weight, includes the following raw materials: 25-45 parts modified polyurethane acrylic resin; 10-20 parts hydroxyl acrylic resin; 15-25 parts color paste; 21-40 parts additive I; component B, by weight, includes the following raw materials: 70-80 parts hexamethyl hexamethylene diisocyanate; 20-30 parts organic solvent; component C, by weight, includes the following components: 25-45 parts polycarbonate diol; 5-20 parts polyurethane resin; 45-70 parts additive II; component D, by weight, includes: 85-95 parts hexamethyl hexamethylene diisocyanate; 5-15 parts organic solvent. The coating of this invention has the advantages of good appearance and decoration, excellent adhesion, good alcohol resistance, good scratch resistance, and meeting the requirements of 3D printing of consumable plastics such as PLA and PETG.

Description

Technical Field

[0001] The present invention relates to the technical field of PU coatings, and in particular to a 3D printing panel coating and a preparation method and application thereof. Background Art

[0002] In recent years, with the development of intelligent manufacturing technology, 3D printing has gradually become an important force in promoting the cultivation and development of new quality productivity in my country, and its application scenarios are constantly expanding. 3D printing is usually achieved by using digital technology material printers, and is often used to make models in mold manufacturing, industrial design and other fields. The coating covering the 3D printing panel can make it beautiful, alcohol-resistant, scratch-resistant, and corrosion-resistant, while allowing engineering plastics to be printed normally.

[0003] Existing 3D printing panel coatings cannot simultaneously meet the protection function, printing function and life function. On the premise of meeting the protection function, most of the time in the actual use process, it is necessary to use glue to complete printing. The number of times glue is applied will reduce the service life of the 3D printing panel.

[0004] Therefore, it is necessary to develop an efficient 3D printing panel coating that takes into account the appearance function, protection function and printing function. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a 3D printing panel coating and a preparation method and application thereof. By limiting each component and its ratio, the coating prepared by the present invention can meet the appearance function, protection function and printing function of the 3D printing panel.

[0006] The technical solution of the present invention is as follows:

[0007] A first aspect of the present invention provides a 3D printing panel coating, characterized in that the 3D printing panel coating comprises a primer and a topcoat;

[0008] The primer comprises component A and component B;

[0009] The topcoat comprises a C component and a D component;

[0010] The component A comprises the following raw materials by weight: 25-45 parts of modified polyurethane acrylic resin; 10-20 parts of hydroxy acrylic resin; 15-25 parts of color paste; 21-40 parts of auxiliary agent I;

[0011] The B component includes the following raw materials by weight: 70-80 parts of hexamethylhexamethylene diisocyanate; 20-30 parts of an organic solvent;

[0012] The C component includes the following components by weight: 25-39 parts of polycarbonate diol; 6-20 parts of polyurethane resin; 45-70 parts of auxiliary agent II;

[0013] The D component comprises the following components by weight: 85-95 parts of hexamethylhexamethylene diisocyanate; and 5-15 parts of an organic solvent.

[0014] Preferably, the weight ratio of the component A to the component B is 100:3-8;

[0015] And / or, the weight ratio of the C component to the D component is 100:10-15.

[0016] Preferably, in the component A, the modified polyurethane acrylic resin includes one or both of NPU-2652BG of Guangzhou Xinyingyuan Chemical Co., Ltd. and TA-6286ME of Shenzhen Xintuopu New Materials Co., Ltd.;

[0017] And / or, the hydroxy acrylic resin includes one or both of LF-2737 of Lihua Synthetic Resin and ACR6688 of Guangdong Tongde New Materials Co., Ltd.;

[0018] And / or, the color paste includes at least one of black paste, white paste, red paste, blue paste and yellow paste; preferably, the color paste includes at least one of NX-501WHITE, FPGS-245S BLACK (NX) and DNS A-126 of Dainichi Seika;

[0019] And / or, the auxiliary agent I in component A of the primer includes: 3-5 parts of adhesion promoter; 3-5 parts of anti-settling agent; 5-10 parts of sand grain powder; and 10-22 parts of diluent I.

[0020] Preferably, the adhesion promoter includes EDL-6026F of Guangzhou Zhihui Fine Chemical Co., Ltd., At least one of AddBond LTW-B;

[0021] And / or, the anti-settling agent includes dispalon At least one of NS-5501 and PEA-231;

[0022] And / or, the sand grain powder includes at least one of elastic powder D38 of Dongguan Baolimei Plastic Co., Ltd. and DAIPLACOAT RHC-311WHITE of Dainippon Seika Co., Ltd.;

[0023] And / or, the diluent I includes at least one of ethyl acetate, butyl acetate and xylene.

[0024] Preferably, in the B component, the hexamethyldisilazane diisocyanate includes Asahi Chemical's TKA-100, Covestro's At least one of N3300;

[0025] And / or, the organic solvent includes at least one of butyl acetate and ethyl acetate.

[0026] Preferably, in the C component, the polycarbonate diol includes at least one of PU-300D of Ube Fine Chemicals (Asia) Co., Ltd. and T5652 of Asahi Chemical;

[0027] And / or, the polyurethane resin includes at least one of PU-500 of Guangdong Subi Chemical Co., Ltd. and TA-6286ME of Shenzhen Xintuopu New Materials Co., Ltd.;

[0028] And / or, the auxiliary agent II comprises: 5-10 parts of matting powder; 0.05-0.1 parts of drying agent; 40-60 parts of diluent II;

[0029] The matting agent includes E-1011 of TOSOH, At least one of K-500;

[0030] And / or, the drying agent is At least one of the following: T-12, DSP-932 produced by Zhongshan Jieshida;

[0031] And / or, the diluent II includes one or more of ethyl acetate, butyl acetate, and diisobutyl ketone.

[0032] Preferably, in the D component, the hexamethyldisilazane diisocyanate includes at least one of Asahi Chemical's Dornade E402-90T and Dornade E402-80B;

[0033] And / or, the organic solvent includes at least one of butyl acetate and ethyl acetate.

[0034] Preferably, the primer further comprises a primer composite solvent;

[0035] The primer composite solvent includes at least three of ethyl acetate, butyl acetate, xylene and acetone;

[0036] Preferably, the primer composite solvent comprises, by mass percentage, 35-45wt% ethyl acetate, 25-35wt% butyl acetate, 10-15wt% xylene and 10-15wt% acetone;

[0037] The weight ratio of the component A, the component B and the primer composite solvent is 100:3-8:180;

[0038] The topcoat also includes a topcoat composite solvent;

[0039] The topcoat composite solvent includes at least three of ethyl acetate, butyl acetate, diisobutyl ketone, and diacetone alcohol;

[0040] Preferably, the topcoat composite solvent comprises, by mass percentage, 40-50wt% ethyl acetate, 20-30wt% butyl acetate, 5-15wt% diisobutyl ketone and 10-30wt% diacetone alcohol;

[0041] The weight ratio of the component A, the component B and the topcoat composite solvent is 100:10-15:100.

[0042] The second aspect of the present invention protects a method for preparing the 3D printing panel coating according to the first aspect, the preparation method comprising the following steps:

[0043] S1: 25-45 parts of modified polyurethane acrylic resin, 10-20 parts of hydroxyl acrylic resin, 15-25 parts of color paste, 3-5 parts of adhesion promoter, 3-5 parts of anti-settling agent, and 1 / 2 part by weight of diluent I are mixed, stirred for 10-15 minutes, 5-10 parts of sand grain powder are added while stirring, stirring is continued for 20-30 minutes, and finally the remaining 1 / 2 weight of diluent I is added, stirred again for 10-15 minutes, and filtered to obtain component A of the primer;

[0044] S2: Mix 70-80 parts of hexamethylhexamethylene diisocyanate and 20-30 parts of an organic solvent to obtain a primer component B;

[0045] S3: 25-39 parts of polycarbonate diol, 6-20 parts of polyurethane resin, 0.05-0.1 parts of drier and 1 / 2 weight of diluent II are mixed, stirred at a speed of 600-800 r / min for 10-15 min, 5-10 parts of matting powder are added while stirring, and then stirred at 800-1000 r / min for 20-30 min, the remaining 1 / 2 weight of diluent II is added, and then stirred at a speed of 600-800 r / min for 10-15 min, filtered, and the C component of the topcoat is obtained;

[0046] S4: 85-95 parts of hexamethylhexamethylene diisocyanate and 5-15 parts of an organic solvent are mixed to obtain a D component of a topcoat;

[0047] S5: mixing 35-45 wt % of ethyl acetate, 25-35 wt % of butyl acetate, 10-20 wt % of xylene and 10-20 wt % of acetone to obtain a primer composite solvent;

[0048] S6: mixing 40-50 wt % of ethyl acetate, 20-30 wt % of butyl acetate, 5-15 wt % of diisobutyl ketone and 15-25 wt % of diacetone alcohol to obtain a topcoat composite solvent;

[0049] S7: Mixing component A of step S1, component B of step S2 and the primer composite solvent of step S5 to obtain a primer; mixing component C of step S3, component D of step S4 and the topcoat composite solvent of step S6 to obtain a topcoat, that is, obtaining the 3D printing panel coating;

[0050] In step S1, the stirring speed is 600-800 r / min.

[0051] The third aspect of the present invention protects an application of the 3D printing panel coating described in the first aspect or the 3D printing panel coating prepared by the preparation method described in the second aspect, wherein the 3D printing panel coating is used for preparing a 3D printing panel coating;

[0052] The specific application method is: spraying the primer of the 3D printing panel coating on the 3D printing panel, drying at 80-90°C for 30-40 minutes, and then spraying the topcoat on the primer surface, and baking at 90-100°C for 120-150 minutes to obtain a 3D printing panel containing a coating.

[0053] The beneficial technical effects of the present invention are:

[0054] The primer of the 3D printing panel coating prepared by the present invention is a combination of modified polyurethane acrylic resin and hydroxy acrylic resin. Both resins have excellent adhesion and salt spray resistance on the 3D printing bread substrate. The prepared coating has good protection function, but due to the different flexibility of the two resins, the flexibility is further adjusted by adjusting the ratio to improve the printability. The primer has a good wetting effect on the toner, which can ensure the printing function while improving the appearance function to meet the needs of different color appearances.

[0055] The topcoat of the 3D printing panel coating of the present invention is a combination of polycarbonate diol and polyurethane resin, which is scratch-resistant and alcohol-resistant, can meet the requirements of coating protection function, and has a certain elastic effect, can realize direct printing of engineering plastics, and can make the printing consumables have stable adhesion on the printing panel without the need for additional glue, thereby increasing the number of times the printing panel can be used; the drying agent used can further increase the surface drying speed of the coating, thereby improving production efficiency.

[0056] The preparation method of the primer and topcoat in the 3D printing panel coating of the present invention is simple and easy to operate, and the obtained coating has good appearance effect and excellent performance, which fully meets the requirements of industrial large-scale production. DETAILED DESCRIPTION

[0057] The present invention will be described in detail below in conjunction with the embodiments.

[0058] The invention provides a 3D printing panel coating and a preparation method and application thereof.

[0059] It can be understood that the modified polyurethane acrylic resin used in the present invention is preferably NPU-2652BG of Guangzhou Xinyingyuan Chemical Co., Ltd. and TA-6286ME of Shenzhen Xintuopu New Materials Co., Ltd., which have excellent adhesion, salt spray resistance, good flexibility, and can achieve color adjustment.

[0060] It can be understood that the hydroxy acrylic resin used in the present invention is preferably LF-2737 of Lihua Synthetic Resin and ACR6688 of Guangdong Tongde New Materials Co., Ltd., which have the characteristics of excellent adhesion, salt spray resistance, scratch resistance, color adjustment, etc.

[0061] It is understandable that the color paste used in the present invention is preferably NX-501WHITE, FPGS-245SBLACK (NX), and DNS A-126 produced by Dainichi Seika, and the color paste can meet various color requirements.

[0062] It is understandable that the adhesion promoter of the primer used in the present invention is preferably EDL-6026F of Guangzhou Zhihui Fine Chemical Co., Ltd. This adhesion promoter can enhance the adhesion of the primer to the substrate and better realize the printing function.

[0063] It is understood that the anti-settling agent of the primer used in the present invention is preferably Disibalon NS-5501, the anti-settling agent can improve the anti-settling effect of primer A component and meet the storage requirements.

[0064] It is understandable that the sand-texture powder of the primer used in the present invention is preferably the elastic powder D38 of Dongguan Baolimei Plastic Co., Ltd., which can provide a sand-texture effect for the coating and also has a scratch-resistant effect.

[0065] It is understandable that the diluent I of the primer used in the present invention is preferably three of ethyl acetate, butyl acetate and xylene. The diluent I can dissolve the resin, adjust the viscosity and has a moderate volatilization rate.

[0066] It is understandable that the hexamethyldisilazane diisocyanate of the primer used in the present invention is preferably TKA-100 produced by Asahi Chemical Industry Co., Ltd. This raw material has a high NCO content, good weather resistance, and fast drying, thereby improving printing efficiency and effect.

[0067] It is understandable that the polycarbonate diol used in the topcoat of the present invention is preferably PU-300D of Ube Fine Chemicals (Asia) Co., Ltd. and T5652 of Asahi Chemical Industry Co., Ltd. The polycarbonate diol is scratch-resistant and alcohol-resistant, and has good flexibility and is suitable for printing.

[0068] It is understandable that the polyurethane resin of the topcoat used in the present invention is preferably PU-500 of Guangdong Subi Chemical Co., Ltd. and TA-6286ME of Shenzhen Xintuopu New Materials Co., Ltd. The polyurethane resin is alcohol-resistant and has good flexibility.

[0069] It is understandable that the matting powder of the topcoat used in the present invention is preferably E-1011 of Tosoh, which has strong matting energy and is easy to disperse.

[0070] It is understood that the drier for the topcoat used in the present invention is preferably T-12, this drier can reduce the drying time of the paint film and accelerate curing.

[0071] It is understandable that the diluent II of the topcoat used in the present invention is preferably ethyl acetate, butyl acetate, or diisobutyl ketone. The diluent II can dissolve the resin, adjust the viscosity, and has a moderate volatilization rate.

[0072] It is understandable that the hexamethyldisilazane diisocyanate used in the topcoat of the present invention is preferably Asahi Chemical's Dornade E402-90T, which has the characteristics of good weather resistance and high elongation.

[0073] It can be understood that in the present invention, the appearance function includes but is not limited to different appearance colors, the protection function includes but is not limited to passing the salt spray test, alcohol resistance test, etc., and the printing function includes but is not limited to passing the adhesion test, sticky material test, and warping test, etc.

[0074] The present invention will be further described below by way of examples and the like.

[0075] Example 1

[0076] A 3D printing panel coating, comprising a primer and a topcoat, wherein the primer comprises component A, component B and a primer composite solvent in parts by mass;

[0077] Among them, component A includes the following raw materials in parts by weight: 25 parts of modified polyurethane acrylic resin (NPU-2652BG purchased from Guangzhou Xinyingyuan Chemical Co., Ltd.), 20 parts of hydroxyl acrylic resin (LF-2737 purchased from Lihua Synthetic Resin), 15 parts of white pulp (NX-501WHITE purchased from Dainichi Seika), 5 parts of black pulp (FPGS-245S BLACK (NX) purchased from Dainichi Seika), 4 parts of adhesion promoter (EDL-6026F purchased from Guangzhou Zhihui Fine Chemical Co., Ltd.), 3.5 parts of anti-settling agent (purchased from Disibalon) NS-5501), 6 parts of sand grain powder (elastic powder D38 of Dongguan Baolimei Plastic Co., Ltd.), 6 parts of xylene and 8 parts of butyl acetate, 7.5 parts of ethyl acetate.

[0078] Component B includes the following raw materials in parts by weight: 75 parts of hexamethylhexamethylene diisocyanate (Donaide™ TKA-100 purchased from Asahi Chemical) and 25 parts of butyl acetate.

[0079] The primer composite solvent includes 40 wt % ethyl acetate, 30 wt % butyl acetate, 15 wt % xylene and 15 wt % acetone.

[0080] The topcoat comprises a C component, a D component and a primer composite solvent;

[0081] Component C includes the following raw materials in parts by weight: 30 parts of polycarbonate diol (PU-300D purchased from Ube Fine Chemicals (Asia) Co., Ltd.), 15 parts of polyurethane resin (PU-500 purchased from Guangdong Subi Chemical Co., Ltd.), 7 parts of matting powder (E-1011 purchased from Tosoh), 0.1 parts of drying agent T-12, 12 parts of butyl acetate, 12 parts of diisobutyl ketone, 23.9 parts of ethyl acetate.

[0082] Component D includes the following raw materials in parts by weight: 95 parts of hexamethylhexamethylene diisocyanate (Duramid E402-90T purchased from Asahi Chemical) and 5 parts of butyl acetate;

[0083] The topcoat composite solvent includes 45 wt % ethyl acetate, 25 wt % butyl acetate, 10 wt % diisobutyl ketone and 20 wt % diacetone alcohol.

[0084] The preparation method of the above 3D printing panel coating comprises the following steps:

[0085] (1) 25 parts of modified polyurethane acrylic resin, 20 parts of hydroxyl acrylic resin, 15 parts of white pulp, 5 parts of black pulp, 4 parts of adhesion promoter, 3.5 parts of anti-settling agent, 6 parts of xylene and 8 parts of butyl acetate were added into a vat in sequence, stirred at a stirring speed of 700 r / min for 12 minutes, 6 parts of sand grain powder were added while stirring, stirred at a stirring speed of 700 r / min for 25 minutes, and finally 7.5 parts of ethyl acetate were added, stirred at a stirring speed of 700 r / min for 12 minutes, and then filtered using a 160-mesh filter bag to obtain the primer A component;

[0086] (2) mixing 75 parts of hexamethyldisilazane diisocyanate TKA-100 and 25 parts of butyl acetate to prepare the primer B component;

[0087] (3) 30 parts of polycarbonate diol, 15 parts of polyurethane resin, 0.1 parts of drying agent, 12 parts of butyl acetate, and 12 parts of diisobutyl ketone are sequentially added into a cylinder, stirred at a stirring speed of 70 r / min for 12 minutes, and 7 parts of matting powder are added while stirring, stirred at a stirring speed of 900 r / min for 25 minutes. After the fineness is tested to be qualified, 23.9 parts of ethyl acetate are finally added at a stirring speed of 700 r / min, stirred for 12 minutes, and then filtered through a 200-mesh filter bag to obtain the topcoat C component;

[0088] (4) mixing 95 parts of hexamethyldisilazane diisocyanate E402-90T and 5 parts of butyl acetate to prepare the topcoat component D;

[0089] (5) A primer composite solvent prepared by mixing 40 wt % ethyl acetate, 30 wt % butyl acetate, 15 wt % xylene and 15 wt % acetone;

[0090] (6) The topcoat composite solvent is prepared by mixing 45 wt % ethyl acetate, 25 wt % butyl acetate, 10 wt % diisobutyl ketone and 20 wt % diacetone alcohol.

[0091] (7) When in use, the primer component A, the component B and the primer composite solvent are mixed in a weight ratio of 100:5:180 to obtain the primer of the 3D printing panel coating;

[0092] (8) When in use, the topcoat component C, component D and topcoat composite solvent are mixed in a weight ratio of 100:12:100 to obtain the topcoat of the 3D printing panel coating.

[0093] The application of the above 3D printing panel coating is used to prepare a 3D printing panel containing a primer and a topcoat coating, comprising the following steps:

[0094] 1) The above-mentioned 3D printing panel coating primer and topcoat are prepared and used immediately. The above-mentioned primer coating is stirred at a speed of 300rpm for 5min, filtered with 160 mesh, and then sprayed on the 3D printing panel material in a clean room. The clean room temperature is controlled at 25-30°C, the humidity is controlled at 40-70%, the spraying air pressure is 0.4MPa, and the wet film state is controlled. After the product is placed for 1-2min, it is placed in an oven and placed at 80°C for 0.5h to obtain a dry film thickness of 5-40μm (measured by a film thickness meter), and a 3D printing panel sprayed with primer is obtained.

[0095] 2) After stirring the obtained topcoat coating at a speed of 300 rpm for 5 minutes, the topcoat coating was filtered through 300 mesh, and then sprayed onto the 3D printed panel material sprayed with primer in a clean room. The temperature of the clean room was controlled at 25-30°C, the humidity was controlled at 40-70%, the spraying air pressure was 0.4 MPa, and the wet film state was controlled. After the product was placed for 1-2 minutes, it was placed in an oven and placed at 90°C for 2 hours to obtain a dry film thickness of 25-35 μm (measured by a film thickness meter), and a 3D printed panel sprayed with primer coating and topcoat coating was obtained.

[0096] Example 2

[0097] A 3D printing panel coating, comprising a primer and a topcoat, wherein the primer comprises component A, component B and a primer composite solvent in parts by mass;

[0098] Among them, component A includes the following raw materials in parts by weight: 35 parts of modified polyurethane acrylic resin, 10 parts of hydroxy acrylic resin, 10 parts of white pulp, 5 parts of black pulp, 3 parts of adhesion promoter, 3 parts of anti-settling agent, 5 parts of sand grain powder, 2 parts of xylene and 3 parts of butyl acetate, 5 parts of ethyl acetate.

[0099] Component B includes the following raw materials in parts by weight: 70 parts of hexamethylhexamethylene diisocyanate TKA-100 and 20 parts of butyl acetate.

[0100] The primer composite solvent includes 40 wt % ethyl acetate, 30 wt % butyl acetate, 15 wt % xylene and 15 wt % acetone.

[0101] The topcoat comprises a C component, a D component and a primer composite solvent;

[0102] Among them, component C includes the following raw materials in parts by weight: 25 parts of polycarbonate diol, 6 parts of polyurethane resin, 5 parts of matting powder, 0.05 parts of drying agent, 12 parts of butyl acetate, 12 parts of diisobutyl ketone, and 16 parts of ethyl acetate.

[0103] Component D includes the following raw materials in parts by weight: 85 parts of hexamethylhexamethylene diisocyanate E402-90T and 10 parts of butyl acetate;

[0104] The topcoat composite solvent includes 45 wt % ethyl acetate, 25 wt % butyl acetate, 10 wt % diisobutyl ketone and 20 wt % diacetone alcohol.

[0105] The manufacturer models of the raw materials in this embodiment are the same as those in Example 1.

[0106] The preparation method of the above 3D printing panel coating comprises the following steps:

[0107] (1) 35 parts of modified polyurethane acrylic resin, 10 parts of hydroxyl acrylic resin, 10 parts of white pulp, 5 parts of black pulp, 3 parts of adhesion promoter, 3 parts of anti-settling agent, 2 parts of xylene and 3 parts of butyl acetate were added into a vat in sequence, stirred at a stirring speed of 600 r / min for 15 minutes, 5 parts of sand grain powder were added while stirring, stirred at a stirring speed of 800 r / min for 30 minutes, and finally 5 parts of ethyl acetate were added, stirred at a stirring speed of 600 r / min for 10 minutes, and then filtered using a 160-mesh filter bag to obtain the primer A component;

[0108] (2) mixing 70 parts of hexamethyldisilazane diisocyanate TKA-100 and 20 parts of butyl acetate to prepare the primer B component;

[0109] (3) 25 parts of polycarbonate diol, 6 parts of polyurethane resin, 0.05 parts of drying agent, 12 parts of butyl acetate, and 12 parts of diisobutyl ketone are added to a cylinder in sequence, stirred at a stirring speed of 600 r / min for 10 minutes, and 5 parts of matting powder are added while stirring, stirred at a stirring speed of 800 r / min for 20 minutes. After the fineness is tested to be qualified, 16 parts of ethyl acetate are finally added, stirred at a stirring speed of 600 r / min for 10 minutes, and then filtered through a 200-mesh filter bag to obtain the topcoat C component;

[0110] (4) 85 parts of hexamethyldisilazane diisocyanate E402-90T and 10 parts of butyl acetate were mixed to prepare the topcoat component D;

[0111] (5) A primer composite solvent prepared by mixing 40 wt % ethyl acetate, 30 wt % butyl acetate, 15 wt % xylene and 15 wt % acetone;

[0112] (6) The topcoat composite solvent is prepared by mixing 45 wt % ethyl acetate, 25 wt % butyl acetate, 10 wt % diisobutyl ketone and 20 wt % diacetone alcohol.

[0113] (7) When in use, the primer component A, the component B and the primer composite solvent are mixed in a weight ratio of 100:3:180 to obtain the primer of the 3D printing panel coating;

[0114] (8) When in use, the topcoat component C, component D and topcoat composite solvent are mixed in a weight ratio of 100:10:100 to obtain the topcoat of the 3D printing panel coating.

[0115] The above-mentioned 3D printing panel coating is used to prepare a 3D printing panel containing a primer and a topcoat coating. The specific application method is basically the same as that of Example 1, except that the primer and topcoat of this example are used.

[0116] Example 3

[0117] A 3D printing panel coating, comprising a primer and a topcoat, wherein the primer comprises component A, component B and a primer composite solvent in parts by mass;

[0118] Among them, component A includes the following raw materials in parts by weight: 45 parts of modified polyurethane acrylic resin, 15 parts of hydroxy acrylic resin, 20 parts of white pulp, 5 parts of black pulp, 5 parts of adhesion promoter, 5 parts of anti-settling agent, 10 parts of sand grain powder, 3 parts of xylene and 4 parts of butyl acetate, and 8 parts of ethyl acetate.

[0119] Component B includes the following raw materials in parts by weight: 80 parts of hexamethylhexamethylene diisocyanate TKA-100 and 30 parts of butyl acetate.

[0120] The primer composite solvent includes 40 wt % ethyl acetate, 30 wt % butyl acetate, 15 wt % xylene and 15 wt % acetone.

[0121] The topcoat comprises a C component, a D component and a primer composite solvent;

[0122] Among them, component C includes the following raw materials in parts by weight: 39 parts of polycarbonate diol, 20 parts of polyurethane resin, 10 parts of matting powder, 0.05 parts of drying agent, 15 parts of butyl acetate, 15 parts of diisobutyl ketone, and 30 parts of ethyl acetate.

[0123] Component D includes the following raw materials in parts by weight: 90 parts of hexamethylhexamethylene diisocyanate E402-90T and 15 parts of butyl acetate;

[0124] The topcoat composite solvent includes 45 wt % ethyl acetate, 25 wt % butyl acetate, 10 wt % diisobutyl ketone and 20 wt % diacetone alcohol.

[0125] The manufacturer models of the raw materials in this embodiment are the same as those in Example 1.

[0126] The preparation method of the above 3D printing panel coating comprises the following steps:

[0127] (1) 45 parts of modified polyurethane acrylic resin, 15 parts of hydroxyl acrylic resin, 20 parts of white pulp, 5 parts of black pulp, 5 parts of adhesion promoter, 5 parts of anti-settling agent, 3 parts of xylene and 4 parts of butyl acetate were added into a vat in sequence, stirred at a stirring speed of 600 r / min for 15 minutes, 10 parts of sand grain powder were added while stirring, stirred at a stirring speed of 800 r / min for 30 minutes, and finally 8 parts of ethyl acetate were added, stirred at a stirring speed of 600 r / min for 10 minutes, and then filtered using a 160-mesh filter bag to obtain the primer A component;

[0128] (2) 80 parts of hexamethyldisilazane diisocyanate TKA-100 and 30 parts of butyl acetate were mixed to prepare the primer component B;

[0129] (3) 39 parts of polycarbonate diol, 20 parts of polyurethane resin, 0.05 parts of drying agent, 15 parts of butyl acetate, and 15 parts of diisobutyl ketone are added to a cylinder in sequence, stirred at a stirring speed of 800 r / min for 15 minutes, and 10 parts of matting powder are added while stirring, and stirred at a stirring speed of 1000 r / min for 30 minutes. After the fineness is tested to be qualified, 30 parts of ethyl acetate are finally added, and stirred at a stirring speed of 600 r / min for 10 minutes. Then, the mixture is filtered through a 200-mesh filter bag to obtain the topcoat component C;

[0130] (4) mixing 90 parts of hexamethyldisilazane diisocyanate E402-90T and 15 parts of butyl acetate to prepare the topcoat component D;

[0131] (5) A primer composite solvent prepared by mixing 40 wt % ethyl acetate, 30 wt % butyl acetate, 15 wt % xylene and 15 wt % acetone;

[0132] (6) The topcoat composite solvent is prepared by mixing 45 wt % ethyl acetate, 25 wt % butyl acetate, 10 wt % diisobutyl ketone and 20 wt % diacetone alcohol.

[0133] (7) When in use, the primer component A, the component B and the primer composite solvent are mixed in a weight ratio of 100:8:180 to obtain the primer of the 3D printing panel coating;

[0134] (8) When in use, the topcoat component C, component D and topcoat composite solvent are mixed in a weight ratio of 100:15:100 to obtain the topcoat of the 3D printing panel coating.

[0135] The above-mentioned 3D printing panel coating is used to prepare a 3D printing panel containing a primer and a topcoat coating. The specific application method is basically the same as that of Example 1, except that the primer and topcoat of this example are used.

[0136] Comparative Example 1

[0137] A 3D printing panel coating, comprising a primer and a topcoat, wherein the primer comprises component A, component B and a primer composite solvent in parts by mass;

[0138] Among them, component A includes the following raw materials in parts by weight: 40 parts of modified polyurethane acrylic resin, 5 parts of hydroxy acrylic resin, 15 parts of white pulp, 5 parts of black pulp, 4 parts of adhesion promoter, 3.5 parts of anti-settling agent, 6 parts of sand grain powder, 6 parts of xylene, 8 parts of butyl acetate, and 7.5 parts of ethyl acetate.

[0139] Component B includes the following raw materials in parts by weight: 75 parts of hexamethylhexamethylene diisocyanate TKA-100 and 25 parts of butyl acetate.

[0140] The composite solvent of the primer is 40 wt % ethyl acetate, 30 wt % butyl acetate, 15 wt % xylene and 15 wt % acetone.

[0141] The topcoat comprises a C component, a D component and a primer composite solvent;

[0142] Among them, component C includes the following raw materials in parts by weight: 30 parts of polycarbonate diol, 15 parts of polyurethane resin, 7 parts of matting powder, 0.1 parts of drying agent, 12 parts of butyl acetate, 12 parts of diisobutyl ketone, and 23.9 parts of ethyl acetate.

[0143] The D component includes the following raw materials in parts by weight: 95 parts of hexamethylhexamethylene diisocyanate E402-90T and 5 parts of butyl acetate.

[0144] The composite solvent of the topcoat is 45 wt% ethyl acetate, 25 wt% butyl acetate, 10 wt% diisobutyl ketone and 20 wt% diacetone alcohol.

[0145] The manufacturer models of the raw materials in this comparative example are the same as those in Example 1.

[0146] The preparation method of the above 3D printing panel coating comprises the following steps:

[0147] (1) 40 parts of modified polyurethane acrylic resin, 5 parts of hydroxyl acrylic resin, 15 parts of white pulp, 5 parts of black pulp, 4 parts of adhesion promoter, 3.5 parts of anti-settling agent, 6 parts of xylene and 8 parts of butyl acetate were added into a cylinder in sequence, stirred at a stirring speed of 800 r / min for 15 minutes, 6 parts of sand grain powder were added while stirring, stirred at a stirring speed of 800 r / min for 20 minutes, and finally 7.5 parts of ethyl acetate were added, stirred at a stirring speed of 600 r / min for 10 minutes, and then filtered using a 160-mesh filter bag to obtain the primer A component;

[0148] (2) mixing 75 parts of hexamethyldisilazane diisocyanate TKA-100 and 25 parts of butyl acetate to prepare the primer B component;

[0149] (3) 30 parts of polycarbonate diol, 15 parts of polyurethane resin, 0.1 parts of drying agent, 12 parts of butyl acetate, and 12 parts of diisobutyl ketone are added to a cylinder in sequence, stirred at a stirring speed of 800 r / min for 10 minutes, and 7 parts of matting powder are added while stirring, and stirred at a stirring speed of 1000 r / min for 25 minutes. After the fineness is tested to be qualified, 23.9 parts of ethyl acetate are finally added, and stirred at a stirring speed of 600 r / min for 10 minutes. Then, the mixture is filtered through a 200-mesh filter bag to obtain the topcoat component C;

[0150] (4) mixing 95 parts of hexamethyldisilazane diisocyanate E402-90T and 5 parts of butyl acetate to prepare the topcoat component D;

[0151] (5) A primer composite solvent prepared by mixing 40 wt % ethyl acetate, 30 wt % butyl acetate, 15 wt % xylene and 15 wt % acetone;

[0152] (6) The topcoat composite solvent is prepared by mixing 45 wt % ethyl acetate, 25 wt % butyl acetate, 10 wt % diisobutyl ketone and 20 wt % diacetone alcohol.

[0153] (7) When in use, the primer component A, the component B and the primer composite solvent are mixed in a weight ratio of 100:5:180 to obtain the primer of the 3D printing panel coating;

[0154] (8) When in use, the topcoat component C, component D and topcoat composite solvent are mixed in a weight ratio of 100:12:100 to obtain the topcoat of the 3D printing panel coating.

[0155] The above-mentioned 3D printing panel coating is used to prepare a 3D printing panel containing a primer and a topcoat coating. The specific application method is basically the same as that of Example 1, except that the primer and topcoat of this example are used.

[0156] Comparative Example 2

[0157] A 3D printing panel coating, comprising a primer and a topcoat, wherein the primer comprises component A, component B and a primer composite solvent in parts by mass;

[0158] Among them, component A includes the following raw materials in parts by weight: 45 parts of modified polyurethane acrylic resin, 0 parts of hydroxy acrylic resin, 15 parts of white pulp, 5 parts of black pulp, 4 parts of adhesion promoter, 3.5 parts of anti-settling agent, 6 parts of sand grain powder, 6 parts of xylene and 8 parts of butyl acetate, 7.5 parts of ethyl acetate.

[0159] Component B includes the following raw materials in parts by weight: 75 parts of hexamethylhexamethylene diisocyanate TKA-100 and 25 parts of butyl acetate.

[0160] The composite solvent of the primer is 40 wt % ethyl acetate, 30 wt % butyl acetate, 15 wt % xylene and 15 wt % acetone.

[0161] The topcoat comprises a C component, a D component and a primer composite solvent;

[0162] Among them, component C includes the following raw materials in parts by weight: 30 parts of polycarbonate diol, 15 parts of polyurethane resin, 7 parts of matting powder, 0.1 parts of drying agent, 12 parts of butyl acetate, 12 parts of diisobutyl ketone, and 23.9 parts of ethyl acetate.

[0163] The D component includes the following raw materials in parts by weight: 95 parts of hexamethylhexamethylene diisocyanate E402-90T and 5 parts of butyl acetate.

[0164] The composite solvent of the topcoat is 45 wt% ethyl acetate, 25 wt% butyl acetate, 10 wt% diisobutyl ketone and 20 wt% diacetone alcohol.

[0165] The manufacturer models of the raw materials in this comparative example are the same as those in Example 1.

[0166] The preparation method of the above 3D printing panel coating comprises the following steps:

[0167] (1) 45 parts of modified polyurethane acrylic resin, 0 parts of hydroxyl acrylic resin, 15 parts of white pulp, 5 parts of black pulp, 4 parts of adhesion promoter, 3.5 parts of anti-settling agent, 6 parts of xylene and 8 parts of butyl acetate were added into a cylinder in sequence, stirred at a stirring speed of 700 r / min for 15 minutes, 6 parts of sand grain powder were added while stirring, stirred at a stirring speed of 800 r / min for 20 minutes, and finally 7.5 parts of ethyl acetate were added, stirred at a stirring speed of 600 r / min for 15 minutes, and then filtered using a 160-mesh filter bag to obtain the primer A component;

[0168] (2) mixing 75 parts of hexamethyldisilazane diisocyanate TKA-100 and 25 parts of butyl acetate to prepare the primer B component;

[0169] (3) 30 parts of polycarbonate diol, 15 parts of polyurethane resin, 0.1 parts of drying agent, 12 parts of butyl acetate, and 12 parts of diisobutyl ketone are added into a cylinder in sequence, stirred at a stirring speed of 600 r / min for 10 minutes, and 7 parts of matting powder are added while stirring, stirred at a stirring speed of 900 r / min for 25 minutes. After the fineness is tested to be qualified, 23.9 parts of ethyl acetate are finally added, stirred at a stirring speed of 600 r / min for 15 minutes, and then filtered through a 200-mesh filter bag to obtain the topcoat C component;

[0170] (4) mixing 95 parts of hexamethyldisilazane diisocyanate E402-90T and 5 parts of butyl acetate to prepare the topcoat component D;

[0171] (5) A primer composite solvent prepared by mixing 40 wt % ethyl acetate, 30 wt % butyl acetate, 15 wt % xylene and 15 wt % acetone;

[0172] (6) The topcoat composite solvent is prepared by mixing 45 wt % ethyl acetate, 25 wt % butyl acetate, 10 wt % diisobutyl ketone and 20 wt % diacetone alcohol.

[0173] (7) When in use, the primer component A, the component B and the primer composite solvent are mixed in a weight ratio of 100:5:180 to obtain the primer of the 3D printing panel coating;

[0174] (8) When in use, the topcoat component C, component D and topcoat composite solvent are mixed in a weight ratio of 100:12:100 to obtain the topcoat of the 3D printing panel coating.

[0175] The above-mentioned 3D printing panel coating is used to prepare a 3D printing panel containing a primer and a topcoat coating. The specific application method is basically the same as that of Example 1, except that the primer and topcoat of this example are used.

[0176] Comparative Example 3

[0177] A 3D printing panel coating, comprising a primer and a topcoat, wherein the primer comprises component A, component B and a primer composite solvent in parts by mass;

[0178] Among them, component A includes the following raw materials in parts by weight: 0 parts of modified polyurethane acrylic resin, 45 parts of hydroxy acrylic resin, 15 parts of white pulp, 5 parts of black pulp, 4 parts of adhesion promoter, 3.5 parts of anti-settling agent, 6 parts of sand grain powder, 6 parts of xylene and 8 parts of butyl acetate, 7.5 parts of ethyl acetate.

[0179] Component B includes the following raw materials in parts by weight: 75 parts of hexamethylhexamethylene diisocyanate TKA-100 and 25 parts of butyl acetate.

[0180] The composite solvent of the primer is 40 wt % ethyl acetate, 30 wt % butyl acetate, 15 wt % xylene and 15 wt % acetone.

[0181] The topcoat comprises a C component, a D component and a primer composite solvent;

[0182] Wherein, component C comprises the following raw materials in parts by weight: 30 parts of polycarbonate diol, 15 parts of polyurethane resin, 7 parts of matting powder, 30.1 parts of drying agent, 12 parts of butyl acetate, 12 parts of diisobutyl ketone, and 23.9 parts of ethyl acetate.

[0183] The D component includes the following raw materials in parts by weight: 95 parts of hexamethylhexamethylene diisocyanate E402-90T and 5 parts of butyl acetate.

[0184] The composite solvent of the topcoat is 45 wt% ethyl acetate, 25 wt% butyl acetate, 10 wt% diisobutyl ketone and 20 wt% diacetone alcohol.

[0185] The manufacturer models of the raw materials in this comparative example are the same as those in Example 1.

[0186] The preparation method of the above 3D printing panel coating comprises the following steps:

[0187] (1) 0 parts of modified polyurethane acrylic resin, 45 parts of hydroxyl acrylic resin, 15 parts of white pulp, 5 parts of black pulp, 4 parts of adhesion promoter, 3.5 parts of anti-settling agent, 6 parts of xylene and 8 parts of butyl acetate are sequentially added into a vat, stirred at a stirring speed of 800 r / min for 10 minutes, 6 parts of sand grain powder are added while stirring, stirred at a stirring speed of 800 r / min for 20 minutes, and finally 7.5 parts of ethyl acetate are added, stirred at a stirring speed of 600 r / min for 15 minutes, and then filtered using a 160-mesh filter bag to obtain the primer A component;

[0188] (2) mixing 75 parts of hexamethyldisilazane diisocyanate TKA-100 and 25 parts of butyl acetate to prepare the primer B component;

[0189] (3) 30 parts of polycarbonate diol, 15 parts of polyurethane resin, 0.1 parts of drying agent, 12 parts of butyl acetate, and 12 parts of diisobutyl ketone are added to a cylinder in sequence, stirred at a stirring speed of 800 r / min for 10 minutes, and 7 parts of matting powder are added while stirring, and stirred at a stirring speed of 1000 r / min for 20 minutes. After the fineness is tested to be qualified, 23.9 parts of ethyl acetate are finally added, and stirred at a stirring speed of 600 r / min for 10 minutes. Then, the mixture is filtered through a 200-mesh filter bag to obtain the topcoat component C;

[0190] (4) mixing 95 parts of hexamethyldisilazane diisocyanate E402-90T and 5 parts of butyl acetate to prepare the topcoat component D;

[0191] (5) A primer composite solvent prepared by mixing 40 wt % ethyl acetate, 30 wt % butyl acetate, 15 wt % xylene and 15 wt % acetone;

[0192] (6) The topcoat composite solvent is prepared by mixing 45 wt % ethyl acetate, 25 wt % butyl acetate, 10 wt % diisobutyl ketone and 20 wt % diacetone alcohol.

[0193] (7) When in use, the primer component A, the component B and the primer composite solvent are mixed in a weight ratio of 100:5:180 to obtain the primer of the 3D printing panel coating;

[0194] (8) When in use, the topcoat component C, component D and topcoat composite solvent are mixed in a weight ratio of 100:12:100 to obtain the topcoat of the 3D printing panel coating.

[0195] The above-mentioned 3D printing panel coating is used to prepare a 3D printing panel containing a primer and a topcoat coating. The specific application method is basically the same as that of Example 1, except that the primer and topcoat of this example are used.

[0196] Comparative Example 4

[0197] A 3D printing panel coating, comprising a primer and a topcoat, wherein the primer comprises component A, component B and a primer composite solvent in parts by mass;

[0198] Among them, component A includes the following raw materials in parts by weight: 25 parts of modified polyurethane acrylic resin, 20 parts of hydroxy acrylic resin, 15 parts of white pulp, 5 parts of black pulp, 4 parts of adhesion promoter, 3.5 parts of anti-settling agent, 6 parts of sand grain powder, 6 parts of xylene and 8 parts of butyl acetate, 7.5 parts of ethyl acetate.

[0199] Component B includes the following raw materials in parts by weight: 75 parts of hexamethylhexamethylene diisocyanate TKA-100 and 25 parts of butyl acetate.

[0200] The composite solvent of the primer is 40 wt % ethyl acetate, 30 wt % butyl acetate, 15 wt % xylene and 15 wt % acetone.

[0201] The topcoat comprises a C component, a D component and a primer composite solvent;

[0202] Component C includes the following raw materials in parts by weight: 55 parts of hydroxy acrylic resin, 7 parts of matting powder, 0.1 parts of drying agent, 12 parts of butyl acetate, 12 parts of diisobutyl ketone, and 23.9 parts of ethyl acetate.

[0203] The D component includes the following raw materials in parts by weight: 95 parts of hexamethylhexamethylene diisocyanate E402-90T and 5 parts of butyl acetate.

[0204] The composite solvent of the topcoat is 45 wt% ethyl acetate, 25 wt% butyl acetate, 10 wt% diisobutyl ketone and 20 wt% diacetone alcohol.

[0205] The manufacturer models of the raw materials in this comparative example are the same as those in Example 1.

[0206] The preparation method of the above 3D printing panel coating comprises the following steps:

[0207] (1) 25 parts of modified polyurethane acrylic resin, 20 parts of hydroxyl acrylic resin, 15 parts of white pulp, 5 parts of black pulp, 4 parts of adhesion promoter, 3.5 parts of anti-settling agent, 6 parts of xylene and 8 parts of butyl acetate were added into a cylinder in sequence, stirred at a stirring speed of 700 r / min for 10 minutes, 6 parts of sand grain powder were added while stirring, stirred at a stirring speed of 800 r / min for 20 minutes, and finally 7.5 parts of ethyl acetate were added, stirred at a stirring speed of 800 r / min for 10 minutes, and then filtered using a 160-mesh filter bag to obtain the primer A component;

[0208] (2) mixing 75 parts of hexamethyldisilazane diisocyanate TKA-100 and 25 parts of butyl acetate to prepare the primer B component;

[0209] (3) 55 parts of hydroxy acrylic resin, 0.1 parts of drying agent, 12 parts of butyl acetate, and 12 parts of diisobutyl ketone are added to a cylinder in sequence, stirred at a stirring speed of 600 r / min for 15 minutes, and 7 parts of matting powder are added while stirring, and stirred at a stirring speed of 1000 r / min for 30 minutes. After the fineness is tested to be qualified, 23.9 parts of ethyl acetate are finally added, and stirred at a stirring speed of 600 r / min for 15 minutes, and then filtered through a 200-mesh filter bag to obtain the topcoat C component;

[0210] (4) mixing 95 parts of hexamethyldisilazane diisocyanate E402-90T and 5 parts of butyl acetate to prepare the topcoat component D;

[0211] (5) A primer composite solvent prepared by mixing 40 wt % ethyl acetate, 30 wt % butyl acetate, 15 wt % xylene and 15 wt % acetone;

[0212] (6) The topcoat composite solvent is prepared by mixing 45 wt % ethyl acetate, 25 wt % butyl acetate, 10 wt % diisobutyl ketone and 20 wt % diacetone alcohol.

[0213] (7) When in use, the primer component A, the component B and the primer composite solvent are mixed in a weight ratio of 100:5:180 to obtain the primer of the 3D printing panel coating;

[0214] (8) When in use, the topcoat component C, component D and topcoat composite solvent are mixed in a weight ratio of 100:12:100 to obtain the topcoat of the 3D printing panel coating.

[0215] The above-mentioned 3D printing panel coating is used to prepare a 3D printing panel containing a primer and a topcoat coating. The specific application method is basically the same as that of Example 1, except that the primer and topcoat of this example are used.

[0216] Comparative Example 5

[0217] A 3D printing panel coating, comprising a primer and a topcoat, wherein the primer comprises component A, component B and a primer composite solvent in parts by mass;

[0218] Among them, component A includes the following raw materials in parts by weight: 25 parts of modified polyurethane acrylic resin, 20 parts of hydroxy acrylic resin, 15 parts of white pulp, 5 parts of black pulp, 1 part of adhesion promoter, 3.5 parts of anti-settling agent, 6 parts of sand grain powder, 6 parts of xylene and 8 parts of butyl acetate, 10.5 parts of ethyl acetate.

[0219] Component B includes the following raw materials in parts by weight: 75 parts of hexamethylhexamethylene diisocyanate TKA-100 and 25 parts of butyl acetate.

[0220] The primer composite solvent includes 40 wt % ethyl acetate, 30 wt % butyl acetate, 15 wt % xylene and 15 wt % acetone.

[0221] The topcoat comprises a C component, a D component and a primer composite solvent;

[0222] Wherein, component C comprises the following raw materials in parts by weight: 30 parts of polycarbonate diol, 15 parts of polyurethane resin, 7 parts of matting powder, 0.1 parts of drying agent, 12 parts of butyl acetate, 12 parts of diisobutyl ketone, and 23.9 parts of ethyl acetate.

[0223] The D component includes the following raw materials in parts by weight: 95 parts of hexamethylhexamethylene diisocyanate E402-90T and 5 parts of butyl acetate.

[0224] The composite solvent of the topcoat is 45 wt% ethyl acetate, 25 wt% butyl acetate, 10 wt% diisobutyl ketone and 20 wt% diacetone alcohol.

[0225] The manufacturer models of the raw materials in this comparative example are the same as those in Example 1.

[0226] The preparation method of the above 3D printing panel coating comprises the following steps:

[0227] (1) 25 parts of modified polyurethane acrylic resin, 20 parts of hydroxyl acrylic resin, 15 parts of white pulp, 5 parts of black pulp, 1 part of adhesion promoter, 3.5 parts of anti-settling agent, 6 parts of xylene and 8 parts of butyl acetate were added into a vat in sequence, stirred at a stirring speed of 800 r / min for 10 minutes, 6 parts of sand grain powder were added while stirring, stirred at a stirring speed of 800 r / min for 20 minutes, and finally 10.5 parts of ethyl acetate were added, stirred at a stirring speed of 600 r / min for 15 minutes, and then filtered using a 160-mesh filter bag to obtain the primer A component;

[0228] (2) mixing 75 parts of hexamethyldisilazane diisocyanate TKA-100 and 25 parts of butyl acetate to prepare the primer B component;

[0229] (3) 30 parts of polycarbonate diol, 15 parts of polyurethane resin, 0.1 parts of drying agent, 12 parts of butyl acetate, and 12 parts of diisobutyl ketone are added to a cylinder in sequence, stirred at a stirring speed of 600 r / min for 10 minutes, and 7 parts of matting powder are added while stirring, and stirred at a stirring speed of 1000 r / min for 20 minutes. After the fineness is tested to be qualified, 23.9 parts of ethyl acetate are finally added, and stirred at a stirring speed of 800 r / min for 15 minutes. Then, the mixture is filtered through a 200-mesh filter bag to obtain the topcoat component C;

[0230] (4) mixing 95 parts of hexamethyldisilazane diisocyanate E402-90T and 5 parts of butyl acetate to prepare the topcoat component D;

[0231] (5) A primer composite solvent prepared by mixing 40 wt % ethyl acetate, 30 wt % butyl acetate, 15 wt % xylene and 15 wt % acetone;

[0232] (6) The topcoat composite solvent is prepared by mixing 45 wt % ethyl acetate, 25 wt % butyl acetate, 10 wt % diisobutyl ketone and 20 wt % diacetone alcohol.

[0233] (7) When in use, the primer component A, the component B and the primer composite solvent are mixed in a weight ratio of 100:5:180 to obtain the primer of the 3D printing panel coating;

[0234] (8) When in use, the topcoat component C, component D and topcoat composite solvent are mixed in a weight ratio of 100:12:100 to obtain the topcoat of the 3D printing panel coating.

[0235] The above-mentioned 3D printing panel coating is used to prepare a 3D printing panel containing a primer and a topcoat coating. The specific application method is basically the same as that of Example 1, except that the primer and topcoat of this example are used.

[0236] Comparative Example 6

[0237] A 3D printing panel coating, comprising a primer and a topcoat, wherein the primer comprises component A, component B and a primer composite solvent in parts by mass;

[0238] Among them, component A includes the following raw materials in parts by weight: 25 parts of modified polyurethane acrylic resin, 20 parts of hydroxy acrylic resin, 15 parts of white pulp, 5 parts of black pulp, 4 parts of adhesion promoter, 3.5 parts of anti-settling agent, 6 parts of sand grain powder, 6 parts of xylene and 8 parts of butyl acetate, 7.5 parts of ethyl acetate.

[0239] Component B includes the following raw materials in parts by weight: 75 parts of hexamethylhexamethylene diisocyanate TKA-100 and 25 parts of butyl acetate.

[0240] The primer composite solvent includes 40 wt % ethyl acetate, 30 wt % butyl acetate, 15 wt % xylene and 15 wt % acetone.

[0241] The topcoat comprises a C component, a D component and a primer composite solvent;

[0242] Among them, component C includes the following raw materials in parts by weight: 40 parts of polycarbonate diol, 5 parts of polyurethane resin, 7 parts of matting powder, 0.1 parts of drying agent, 12 parts of butyl acetate, 12 parts of diisobutyl ketone, and 23.9 parts of ethyl acetate.

[0243] The D component includes the following raw materials in parts by weight: 95 parts of hexamethylhexamethylene diisocyanate E402-90T and 5 parts of butyl acetate.

[0244] The topcoat composite solvent includes 45 wt % ethyl acetate, 25 wt % butyl acetate, 10 wt % diisobutyl ketone and 20 wt % diacetone alcohol.

[0245] The manufacturer models of the raw materials in this comparative example are the same as those in Example 1.

[0246] The preparation method of the above 3D printing panel coating comprises the following steps:

[0247] (1) 25 parts of modified polyurethane acrylic resin, 20 parts of hydroxyl acrylic resin, 15 parts of white pulp, 5 parts of black pulp, 4 parts of adhesion promoter, 3.5 parts of anti-settling agent, 6 parts of xylene and 8 parts of butyl acetate are added into a vat in sequence, stirred at a stirring speed of 600-800 r / min for 10-15 minutes, 6 parts of sand grain powder are added while stirring, stirred at a stirring speed of 600-800 r / min for 20-30 minutes, and finally 7.5 parts of ethyl acetate are added, stirred at a stirring speed of 600-800 r / min for 10-15 minutes, and then filtered using a 160-mesh filter bag to obtain the primer A component;

[0248] (2) mixing 75 parts of hexamethyldisilazane diisocyanate TKA-100 and 25 parts of butyl acetate to prepare the primer B component;

[0249] (3) 40 parts of polycarbonate diol, 5 parts of polyurethane resin, 0.1 parts of drying agent, 12 parts of butyl acetate, and 12 parts of diisobutyl ketone are sequentially added into a cylinder, stirred at a stirring speed of 600-800 r / min for 10-15 minutes, 7 parts of matting powder are added while stirring, stirred at a stirring speed of 800-1000 r / min for 20-30 minutes, and after the fineness is tested to be qualified, 23.9 parts of ethyl acetate are finally added, stirred at a stirring speed of 600-800 r / min for 10-15 minutes, and then filtered through a 200-mesh filter bag to obtain the topcoat C component;

[0250] (4) mixing 95 parts of hexamethyldisilazane diisocyanate E402-90T and 5 parts of butyl acetate to prepare the topcoat component D;

[0251] (5) A primer composite solvent prepared by mixing 40 wt % ethyl acetate, 30 wt % butyl acetate, 15 wt % xylene and 15 wt % acetone;

[0252] (6) The topcoat composite solvent is prepared by mixing 45 wt % ethyl acetate, 25 wt % butyl acetate, 10 wt % diisobutyl ketone and 20 wt % diacetone alcohol.

[0253] (7) When in use, the primer component A, the component B and the primer composite solvent are mixed in a weight ratio of 100:5:180 to obtain the primer of the 3D printing panel coating;

[0254] (8) When in use, the topcoat component C, component D and topcoat composite solvent are mixed in a weight ratio of 100:12:100 to obtain the topcoat of the 3D printing panel coating;

[0255] The above-mentioned 3D printing panel coating is used to prepare a 3D printing panel containing a primer and a topcoat coating. The specific application method is basically the same as that of Example 1, except that the primer and topcoat of this example are used.

[0256] Test Case

[0257] The performance of the panels containing the coatings obtained by spraying the coatings of the above-mentioned embodiments and comparative examples was tested according to the standard method. The results are shown in Table 1 below.

[0258] The appearance is visually observed to see if there are any obvious abnormalities. If there are, it will be recorded as abnormal; if not, it will be recorded as normal.

[0259] The gloss test is measured by a gloss meter at a 60° angle. The test standard value is 3°-5°.

[0260] The conventional adhesion test method is ASTM D3359, Method B, which requires conventional adhesion ≥ 4B.

[0261] The water boiling adhesion is obtained by boiling in water at 80℃ for 0.5h and performing a cross-cut test to obtain the adhesion of the coating surface with no obvious abnormalities on the surface. The adhesion is required to be ≥4B.

[0262] The nail scratch resistance test is to use a nail to scratch the surface of the paint film and visually check whether there are obvious scratches. If there are no obvious scratches, it is qualified.

[0263] Alcohol resistance test: 500g weight, 4 layers of cotton cloth, 30 times per minute, observe 200 times to see if the base material leaks. If not, it means it is qualified.

[0264] The salt spray test adopts ASTM B117, spray for 2 hours, clean and place at room temperature for 24 hours. Observe whether there is obvious change in appearance, if not, it means it is qualified.

[0265] The adhesion test is to use the photosensitive PLA consumables to print a specified T-shaped model, and use a tensile tester to test whether the tensile force reaches 50-80N.

[0266] The sticking test is to use dumb material PLA filament to print a cube model with an edge length of 2cm. Print it 10 times continuously and observe whether there is any residue when the PLA cube is removed from the 3D printing panel. If there is no residue, it means it is qualified.

[0267] The warping test uses PLA filament to print a rectangular model with a length and width of 5 cm and a height of 0.5 cm. If the height of the warping of the four corners of the rectangular model on the 3D printing panel is less than 0.2 mm, it meets the requirements, otherwise the printing effect is not ideal.

[0268] Table 1 Performance tests of embodiments and comparative examples

[0269]

[0270]

[0271] From the results in the above table, it can be seen that the various tests of Example 1 are the best and can meet the test standard requirements. Comparative Example 1 changes the addition ratio of each raw material, and the printing performance of the prepared coating is significantly reduced. Comparative Example 5 reduces the adhesion promoter, and the adhesion cannot meet the requirements, indicating that a suitable adhesion promoter can ensure that the paint film has a more stable adhesion on the substrate; the lift test value of the print in Comparative Example 6 is higher, and its effect is far worse than that of Example 1.

[0272] Comparative Examples 2-4 changed the composition or type of the coating, and the overall performance of the obtained coating was poor and could not meet the requirements of 3D printing. Among them, the viscosity of Comparative Example 2 was too high. For 3D products to be printed on the panel, the adhesion was too low, which would cause the product to fall off the panel. However, as in Comparative Example 2, too much adhesion would increase the difficulty of removing the product after printing, which could not meet the requirements of normal printing and convenient removal, and the product might be damaged after removal. The adhesion of Comparative Example 4 was 0N, and 3D printing could not be achieved at all at this time, so the sticking test and the warping test could not be performed.

[0273] The above is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiments. It is understood that other improvements and changes directly derived or associated by those skilled in the art without departing from the spirit and concept of the present invention should be considered to be included in the protection scope of the present invention.

Claims

1. A 3D printing panel coating, characterized in that: The 3D printing panel coating includes a primer and a topcoat; The primer comprises component A and component B; The topcoat comprises a C component and a D component; The component A comprises the following raw materials by weight: 25-45 parts of modified polyurethane acrylic resin; 10-20 parts of hydroxy acrylic resin; 15-25 parts of color paste; 21-40 parts of additive I; The B component includes the following raw materials by weight: 70-80 parts of hexamethylhexamethylene diisocyanate; 20-30 parts of an organic solvent; The C component includes the following components by weight: 25-39 parts of polycarbonate diol; 6-20 parts of polyurethane resin; 45-70 parts of auxiliary agent II; The D component comprises the following components by weight: 85-95 parts of hexamethylhexamethylene diisocyanate; and 5-15 parts of an organic solvent.

2. The 3D printing panel coating according to claim 1, characterized in that: The weight ratio of the A component to the B component is 100:3-8; And / or, the weight ratio of the C component to the D component is 100:10-15.

3. The 3D printing panel coating according to claim 1, characterized in that: In the component A, the modified polyurethane acrylic resin includes one or two of NPU-2652BG of Guangzhou Xinyingyuan Chemical Co., Ltd. and TA-6286ME of Shenzhen Xintuopu New Materials Co., Ltd.; And / or, the hydroxy acrylic resin includes one or both of LF-2737 of Lihua Synthetic Resin and ACR6688 of Guangdong Tongde New Materials Co., Ltd.; And / or, the color paste includes at least one of black paste, white paste, red paste, blue paste and yellow paste; preferably, the color paste includes at least one of NX-501WHITE, FPGS-245SBLACK (NX) and DNS A-126 of Dainichi Seika; And / or, the auxiliary agent I in component A of the primer includes: 3-5 parts of adhesion promoter; 3-5 parts of anti-settling agent; 5-10 parts of sand grain powder; and 10-22 parts of diluent I.

4. The 3D printing panel coating according to claim 3, characterized in that: The adhesion promoter includes EDL-6026F of Guangzhou Zhihui Fine Chemical Co., Ltd., TEGO At least one of AddBond LTW-B; And / or, the anti-settling agent includes dispalon At least one of NS-5501 and PEA-231; And / or, the sand grain powder includes at least one of elastic powder D38 of Dongguan Baolimei Plastic Co., Ltd. and DAIPLACOATRHC-311WHITE of Dainippon Seika; And / or, the diluent I includes at least one of ethyl acetate, butyl acetate and xylene.

5. The 3D printing panel coating according to claim 1, characterized in that: In the B component, the hexamethyldisilazane diisocyanate includes Asahi Chemical's TKA-100, Covestro's At least one of N3300; And / or, the organic solvent includes at least one of butyl acetate and ethyl acetate.

6. The 3D printing panel coating according to claim 1, characterized in that: In the C component, the polycarbonate diol includes at least one of PU-300D of Ube Fine Chemicals (Asia) Co., Ltd. and T5652 of Asahi Chemical; And / or, the polyurethane resin includes at least one of PU-500 of Guangdong Subi Chemical Co., Ltd. and TA-6286ME of Shenzhen Xintuopu New Materials Co., Ltd.; And / or, the auxiliary agent II comprises: 5-10 parts of matting powder; 0.05-0.1 parts of drying agent; 40-60 parts of diluent II; The matting agent includes E-1011 of TOSOH, At least one of K-500; And / or, the drying agent is At least one of the following: T-12, DSP-932 produced by Zhongshan Jieshida; And / or, the diluent II includes one or more of ethyl acetate, butyl acetate, and diisobutyl ketone.

7. The 3D printing panel coating according to claim 1, characterized in that: In the D component, the hexamethyldisilazane diisocyanate includes at least one of Asahi Chemical's Dornade E402-90T and Dornade E402-80B; And / or, the organic solvent includes at least one of butyl acetate and ethyl acetate.

8. The 3D printing panel coating according to claim 1, characterized in that: The primer also includes a primer composite solvent; The primer composite solvent includes at least three of ethyl acetate, butyl acetate, xylene and acetone; Preferably, the primer composite solvent comprises, by mass percentage, 35-45wt% ethyl acetate, 25-35wt% butyl acetate, 10-15wt% xylene and 10-15wt% acetone; The weight ratio of the component A, the component B and the primer composite solvent is 100:3-8:180; The topcoat also includes a topcoat composite solvent; The topcoat composite solvent includes at least three of ethyl acetate, butyl acetate, diisobutyl ketone, and diacetone alcohol; Preferably, the topcoat composite solvent comprises, by mass percentage, 40-50wt% ethyl acetate, 20-30wt% butyl acetate, 5-15wt% diisobutyl ketone and 10-30wt% diacetone alcohol; The weight ratio of the component A, the component B and the topcoat composite solvent is 100:10-15:

100.

9. A method for preparing the 3D printing panel coating according to any one of claims 1 to 8, characterized in that: The preparation method comprises the following steps: S1: 25-45 parts of modified polyurethane acrylic resin, 10-20 parts of hydroxyl acrylic resin, 15-25 parts of color paste, 3-5 parts of adhesion promoter, 3-5 parts of anti-settling agent, and 1 / 2 part by weight of diluent I are mixed, stirred for 10-15 minutes, 5-10 parts of sand grain powder are added while stirring, stirring is continued for 20-30 minutes, and finally the remaining 1 / 2 weight of diluent I is added, stirred again for 10-15 minutes, and filtered to obtain component A of the primer; S2: Mix 70-80 parts of hexamethylhexamethylene diisocyanate and 20-30 parts of an organic solvent to obtain a primer component B; S3: 25-39 parts of polycarbonate diol, 6-20 parts of polyurethane resin, 0.05-0.1 parts of drier and 1 / 2 weight of diluent II are mixed, stirred at a speed of 600-800 r / min for 10-15 min, 5-10 parts of matting powder are added while stirring, and then stirred at 800-1000 r / min for 20-30 min, the remaining 1 / 2 weight of diluent II is added, and then stirred at a speed of 600-800 r / min for 10-15 min, filtered, and the C component of the topcoat is obtained; S4: 85-95 parts of hexamethylhexamethylene diisocyanate and 5-15 parts of an organic solvent are mixed to obtain a D component of a topcoat; S5: mixing 35-45 wt % of ethyl acetate, 25-35 wt % of butyl acetate, 10-20 wt % of xylene and 10-20 wt % of acetone to obtain a primer composite solvent; S6: mixing 40-50 wt % of ethyl acetate, 20-30 wt % of butyl acetate, 5-15 wt % of diisobutyl ketone and 15-25 wt % of diacetone alcohol to obtain a topcoat composite solvent; S7: Mixing component A of step S1, component B of step S2 and the primer composite solvent of step S5 to obtain a primer; mixing component C of step S3, component D of step S4 and the topcoat composite solvent of step S6 to obtain a topcoat, that is, obtaining the 3D printing panel coating; In step S1, the stirring speed is 600-800 r / min.

10. An application of the 3D printing panel coating according to any one of claims 1 to 8 or the 3D printing panel coating prepared by the preparation method according to claim 9, characterized in that: The 3D printing panel coating is used for preparing 3D printing panel coating; The specific application method is: spraying the primer of the 3D printing panel coating on the 3D printing panel, drying at 80-90°C for 30-40 minutes, and then spraying the topcoat on the primer surface, and baking at 90-100°C for 120-150 minutes to obtain a 3D printing panel containing a coating.

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