Outdoor weather-resistant wear-resistant high-impact PC plate coating

Abstract

The invention relates to the technical field of electronic materials, in particular to an outdoor weather-resistant wear-resistant high-impact PC plate coating which comprises a surface layer, a buffer layer and a bottom layer. The surface layer is prepared from the following components in parts by weight: 25 to 45 parts of polyurethane resin, 25 to 35 parts of acrylic resin, 10 to 15 parts of epoxy resin, 10 to 20 parts of inorganic nano ceramic, 5 to 15 parts of graphene powder and 20 to 25 parts of solvent; the buffer layer is prepared from the following components in parts by weight: 30 to 40 parts of polyurethane resin, 20 to 30 parts of acrylic resin, 5 to 10 parts of epoxy resin, 10 to 20 parts of graphite powder and 15 to 25 parts of filler; the bottom layer is prepared from the following components in parts by weight: 40 to 55 parts of polyurethane resin, 25 to 40 parts of acrylic resin, 2 to 8 parts of amino resin, 10 to 20 parts of silicon dioxide powder and 15 to 20 parts of solvent. Through the synergistic effect of the surface layer coating, the buffer layer coating and the bottom layer coating, the weather resistance and wear resistance are good, and the impact resistance is high.

Description

Technical Field

[0001] The invention relates to the technical field of electronic materials, in particular to an outdoor weather-resistant, wear-resistant and high-impact PC sheet coating. Background Art

[0002] Plastics such as polycarbonate have excellent mechanical properties as back covers for consumer electronic devices, including impact resistance, thermal stability, flame retardancy, and optical properties such as light transmittance. However, due to the low hardness and poor weather resistance of common plastics, products made of plastics usually show limitations in outdoor use, which is not ideal for applications such as car windows, mobile phone screens, vending machine screens, outdoor electronic device housings, and advertising signs. Therefore, it is necessary to perform surface modification or material modification on plastic materials to improve their surface hardness and weather resistance.

[0003] The surface modification method generally used in the prior art is to cover the polycarbonate plastic sheet or film with a hardened coating, such as a surface coating of a silicone substrate or an acrylic substrate, and make up for this defect by using the excellent weather resistance and high hardness after curing of the silicone or acrylic material; however, this surface coating is often relatively brittle, and the impact resistance of the treated polycarbonate plastic sheet is reduced. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an outdoor weather-resistant, wear-resistant and high-impact PC sheet coating to solve the above problems.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: an outdoor weather-resistant, wear-resistant and high-impact PC sheet coating, the coating comprising a surface layer, a buffer layer and a bottom layer, the surface layer comprising the following components by weight: 25-45 parts of polyurethane resin, 25-35 parts of acrylic resin, 10-15 parts of epoxy resin, 10-20 parts of inorganic nano-ceramics, 5-15 parts of graphene powder, and 20-25 parts of solvent; the buffer layer comprises the following components by weight: 30-40 parts of polyurethane resin, 20-30 parts of acrylic resin, 5-10 parts of epoxy resin, 10-20 parts of graphite powder, and 15-25 parts of filler; the bottom layer comprises the following components by weight: 40-55 parts of polyurethane resin, 25-40 parts of acrylic resin, 2-8 parts of amino resin, 10-20 parts of silicon dioxide powder, and 15-20 parts of solvent.

[0006] As a further solution of the present invention, the inorganic nano-ceramics are nano-boron oxide and nano-boron nitride, and the weight ratio of the nano-boron oxide to the nano-boron nitride is 1:2-3.

[0007] As a further solution of the present invention, the particle size of the nano boron oxide is 30-50 nm, and the particle size of the nano boron nitride is 40-70 nm.

[0008] As a further solution of the present invention, the filler is nano titanium dioxide and nano silicon dioxide, and the weight ratio of the nano titanium dioxide to the nano silicon dioxide is 1-2:2-3.

[0009] As a further embodiment of the present invention, the solvent is ethyl acetate or propyl acetate.

[0010] An outdoor weather-resistant, wear-resistant and high-impact PC sheet coating, and a method for preparing the coating, the specific steps are as follows: Step 1, adding polyurethane resin, acrylic resin, epoxy resin, inorganic nano-ceramics, and graphene powder into a solvent in sequence and mixing them evenly to obtain a surface coating; Step 2, polyurethane resin, acrylic resin, epoxy resin, graphite powder and filler are mixed evenly to prepare a buffer layer coating; Step 3, adding polyurethane resin, acrylic resin, amino resin and silicon dioxide powder into the solvent in sequence and mixing them evenly to prepare a base coating; Step 4: Apply the base coating, buffer coating and surface coating in sequence and then cure them.

[0011] As a further solution of the present invention, in step 4, after the base coating is applied and the surface is dried, the buffer layer coating is applied, the surface drying temperature is 85-95° C., and the surface drying time is 20-25 minutes.

[0012] As a further solution of the present invention, in step 4, after the buffer layer coating is applied, the surface is dried and then the surface coating is applied, the surface drying temperature is 85-95°C, and the surface drying time is 15-25 minutes.

[0013] As a further solution of the present invention, the surface coating is cured after coating, the curing temperature is 70-85° C., and the curing time is 30-60 minutes.

[0014] Since the present invention adopts the above technical scheme, the advantages and positive effects of the present invention are: the nano boron oxide and nano boron nitride in the surface coating can have a high impact resistance; the graphite powder, silicon dioxide and titanium dioxide in the buffer layer coating can have wear resistance; the silicon dioxide in the inner layer coating further improves the wear resistance. The present invention has good weather resistance, good wear resistance and high impact resistance through the synergistic effect of the surface layer, buffer layer and bottom layer coating. DETAILED DESCRIPTION

[0015] Example 1 The invention discloses an outdoor weather-resistant, wear-resistant and high-impact PC sheet coating, wherein the coating comprises a surface layer, a buffer layer and a bottom layer, wherein the surface layer comprises the following components in parts by weight: 25 parts of polyurethane resin, 25 parts of acrylic resin, 10 parts of epoxy resin, 3 parts of nano-boron oxide, 7 parts of nano-boron nitride, 5 parts of graphene powder and 20 parts of solvent; the buffer layer comprises the following components in parts by weight: 30 parts of polyurethane resin, 20 parts of acrylic resin, 5 parts of epoxy resin, 10 parts of graphite powder and 15 parts of filler; the bottom layer comprises the following components in parts by weight: 40 parts of polyurethane resin, 25 parts of acrylic resin, 2 parts of amino resin, 10 parts of silicon dioxide powder and 15 parts of solvent; The particle size of nano boron oxide is 30 nm, and the particle size of nano boron nitride is 40 nm; the fillers are nano titanium dioxide and nano silicon dioxide, and the weight ratio of the nano titanium dioxide to the nano silicon dioxide is 1:2; and the solvent is ethyl acetate.

[0016] An outdoor weather-resistant, wear-resistant and high-impact PC sheet coating, and a method for preparing the coating, the specific steps are as follows: Step 1, adding polyurethane resin, acrylic resin, epoxy resin, inorganic nano-ceramics, and graphene powder into ethyl acetate in sequence and mixing them evenly to obtain a surface coating; Step 2, polyurethane resin, acrylic resin, epoxy resin, graphite powder and filler are mixed evenly to prepare a buffer layer coating; Step 3, adding polyurethane resin, acrylic resin, amino resin and silicon dioxide powder into ethyl acetate in sequence and mixing them evenly to prepare a base coating; Step 4: Use a sprayer to spray onto the PC board, spray the base coating, buffer coating, and surface coating in sequence, and then cure them, and test their hardness, roughness, high and low temperature resistance, and adhesion; Among them, after the base coating is applied in step 4, the surface is dried and then the buffer layer coating is applied, the surface drying temperature is 85°C, and the surface drying time is 20 minutes; after the buffer layer coating is applied in step 4, the surface is dried and then the surface coating is applied, the surface drying temperature is 85°C, and the surface drying time is 15 minutes; after applying the surface coating, the surface coating is cured, the curing temperature is 70°C, and the curing time is 30 minutes.

[0017] Example 2 The invention discloses an outdoor weather-resistant, wear-resistant and high-impact PC sheet coating, which is characterized in that: the coating comprises a surface layer, a buffer layer and a bottom layer, the surface layer comprises the following components in parts by weight: 35 parts of polyurethane resin, 30 parts of acrylic resin, 103 parts of epoxy resin, 4 parts of nano boron oxide, 11 parts of nano boron nitride, 10 parts of graphene powder, and 23 parts of solvent; the buffer layer comprises the following components in parts by weight: 35 parts of polyurethane resin, 25 parts of acrylic resin, 8 parts of epoxy resin, 15 parts of graphite powder, and 20 parts of filler; the bottom layer comprises the following components in parts by weight: 48 parts of polyurethane resin, 32 parts of acrylic resin, 5 parts of amino resin, 15 parts of silicon dioxide powder, and 18 parts of solvent; The particle size of nano boron oxide is 40 nm, and the particle size of nano boron nitride is 55 nm; the fillers are nano titanium dioxide and nano silicon dioxide, and the weight ratio of the nano titanium dioxide to the nano silicon dioxide is 1.5:2.5; and the solvent is propyl acetate.

[0018] An outdoor weather-resistant, wear-resistant and high-impact PC sheet coating, and a method for preparing the coating, the specific steps are as follows: Step 1: adding polyurethane resin, acrylic resin, epoxy resin, inorganic nano-ceramics and graphene powder into propyl acetate in sequence and mixing them evenly to obtain a surface coating; Step 2, polyurethane resin, acrylic resin, epoxy resin, graphite powder and filler are mixed evenly to prepare a buffer layer coating; Step 3, adding polyurethane resin, acrylic resin, amino resin and silicon dioxide powder into propyl acetate in sequence and mixing them evenly to prepare a base coating; Step 4: Use a sprayer to spray onto the PC board, spray the base coating, buffer coating, and surface coating in sequence, and then cure them, and test their hardness, roughness, high and low temperature resistance, and adhesion; Among them, after the base coating is applied in step 4, the surface is dried and then the buffer layer coating is applied, the surface drying temperature is 90°C, and the surface drying time is 22 minutes; after the buffer layer coating is applied in step 4, the surface is dried and then the surface coating is applied, the surface drying temperature is 90°C, and the surface drying time is 20 minutes; after the surface coating is applied, the curing temperature is 78°C and the curing time is 45 minutes.

[0019] Example 3 The invention discloses an outdoor weather-resistant, wear-resistant and high-impact PC sheet coating, the coating comprising a surface layer, a buffer layer and a bottom layer, the surface layer comprising the following components in parts by weight: 45 parts of polyurethane resin, 35 parts of acrylic resin, 15 parts of epoxy resin, 9 parts of nano-boron oxide, 11 parts of nano-boron nitride, 5 parts of graphene powder, and 25 parts of solvent; the buffer layer comprising the following components in parts by weight: 40 parts of polyurethane resin, 30 parts of acrylic resin, 10 parts of epoxy resin, 20 parts of graphite powder, and 25 parts of filler; the bottom layer comprising the following components in parts by weight: 55 parts of polyurethane resin, 40 parts of acrylic resin, 8 parts of amino resin, 20 parts of silicon dioxide powder, and 20 parts of solvent; The particle size of nano boron oxide is 50 nm, and the particle size of nano boron nitride is 70 nm; the fillers are nano titanium dioxide and nano silicon dioxide, and the weight ratio of the nano titanium dioxide to the nano silicon dioxide is 2:3; and the solvent is ethyl acetate.

[0020] An outdoor weather-resistant, wear-resistant and high-impact PC sheet coating, and a method for preparing the coating, the specific steps are as follows: Step 1, adding polyurethane resin, acrylic resin, epoxy resin, inorganic nano-ceramics, and graphene powder into ethyl acetate in sequence and mixing them evenly to obtain a surface coating; Step 2, polyurethane resin, acrylic resin, epoxy resin, graphite powder and filler are mixed evenly to prepare a buffer layer coating; Step 3, adding polyurethane resin, acrylic resin, amino resin and silicon dioxide powder into ethyl acetate in sequence and mixing them evenly to prepare a base coating; Step 4: Use a sprayer to spray onto the PC board, spray the base coating, buffer coating, and surface coating in sequence, and then cure them, and test their hardness, roughness, high and low temperature resistance, and adhesion; Among them, after the base coating is applied in step 4, the surface is dried and then the buffer layer coating is applied, the surface drying temperature is 95°C, and the surface drying time is 25 minutes; after the buffer layer coating is applied in step 4, the surface is dried and then the surface coating is applied, the surface drying temperature is 95°C, and the surface drying time is 25 minutes; after applying the surface coating, the surface is cured, the curing temperature is 70-85°C, and the curing time is 30-60 minutes.

[0021] Comparative Example 1 25 parts of polyurethane resin, 25 parts of acrylic resin, 10 parts of epoxy resin, 3 parts of nano-boron oxide, 7 parts of nano-boron nitride, and 5 parts of graphene powder are successively added into 20 parts of ethyl acetate and mixed evenly to obtain a surface coating. The surface coating is sprayed onto a PC board by a sprayer and then cured. The hardness, roughness, high and low temperature resistance, and adhesion are tested.

[0022] Comparative Example 2 40 parts of polyurethane resin, 25 parts of acrylic resin, 2 parts of amino resin and 10 parts of silicon dioxide powder were successively added into 15 parts of ethyl acetate and mixed evenly to prepare a primer. The primer was sprayed onto a PC board by a sprayer and then cured. The hardness, roughness, high and low temperature resistance and adhesion were tested.

[0023] Comparative Example 3 25 parts of polyurethane resin, 25 parts of acrylic resin, 10 parts of epoxy resin, 3 parts of nano boron oxide, 7 parts of nano boron nitride, and 5 parts of graphene powder are sequentially added into 20 parts of ethyl acetate and mixed evenly to prepare a surface coating; 40 parts of polyurethane resin, 25 parts of acrylic resin, 2 parts of amino resin and 10 parts of silicon dioxide powder are sequentially added into 15 parts of ethyl acetate and mixed evenly to prepare a primer; Use a sprayer to spray onto the PC board, apply the base coat first, apply the top coat after it is dry and solidify, and test its hardness, roughness, high and low temperature resistance, and adhesion.

[0024] Table 1 is the performance test of Examples 1-3 and Comparative Examples 1-3 As can be seen from Table 1, the performance of Examples 1-3 is better than that of a single surface layer or a base coating, and is also better than the performance of the combination of the surface layer and the base coating, due to the synergistic effect of the surface layer, the buffer layer and the base coating.

[0025] Although specific embodiments of the present invention are described above, those skilled in the art should understand that these are merely examples and that various changes or modifications may be made to the embodiments without departing from the principles and essence of the present invention. The scope of protection of the present invention is limited only by the appended claims.

Claims

1. An outdoor weather-resistant, wear-resistant and high-impact PC sheet coating, characterized by: The coating comprises a surface layer, a buffer layer and a bottom layer. The surface layer comprises the following components in parts by weight: 25-45 parts of polyurethane resin, 25-35 parts of acrylic resin, 10-15 parts of epoxy resin, 10-20 parts of inorganic nano-ceramics, 5-15 parts of graphene powder, and 20-25 parts of solvent; the buffer layer comprises the following components in parts by weight: 30-40 parts of polyurethane resin, 20-30 parts of acrylic resin, 5-10 parts of epoxy resin, 10-20 parts of graphite powder, and 15-25 parts of filler; the bottom layer comprises the following components in parts by weight: 40-55 parts of polyurethane resin, 25-40 parts of acrylic resin, 2-8 parts of amino resin, 10-20 parts of silicon dioxide powder, and 15-20 parts of solvent.

2. The outdoor weather-resistant, wear-resistant and high-impact PC sheet coating according to claim 1 is characterized by: The inorganic nano-ceramics are nano-boron oxide and nano-boron nitride, and the weight ratio of the nano-boron oxide to the nano-boron nitride is 1:2-3.

3. The outdoor weather-resistant, wear-resistant and high-impact PC sheet coating according to claim 2 is characterized by: The particle size of the nano boron oxide is 30-50nm, and the particle size of the nano boron nitride is 40-70nm.

4. The outdoor weather-resistant, wear-resistant and high-impact PC sheet coating according to claim 1 is characterized by: The fillers are nano titanium dioxide and nano silicon dioxide, and the weight ratio of the nano titanium dioxide to the nano silicon dioxide is 1-2:2-3.

5. The outdoor weather-resistant, wear-resistant and high-impact PC sheet coating according to claim 1 is characterized by: The solvent is ethyl acetate or propyl acetate.

6. The outdoor weather-resistant, wear-resistant and high-impact PC sheet coating according to any one of claims 1 to 5, characterized in that: The preparation method of the coating comprises the following specific steps: Step 1, adding polyurethane resin, acrylic resin, epoxy resin, inorganic nano-ceramics, and graphene powder into a solvent in sequence and mixing them evenly to obtain a surface coating; Step 2, polyurethane resin, acrylic resin, epoxy resin, graphite powder and filler are mixed evenly to prepare a buffer layer coating; Step 3, adding polyurethane resin, acrylic resin, amino resin and silicon dioxide powder into the solvent in sequence and mixing them evenly to prepare a base coating; Step 4: Apply the base coating, buffer coating and surface coating in sequence and then cure them.

7. The outdoor weather-resistant, wear-resistant and high-impact PC sheet coating according to claim 6 is characterized by: In the step 4, after the base coating is applied and the surface is dried, the buffer coating is applied, the surface drying temperature is 85-95° C., and the surface drying time is 20-25 minutes.

8. The outdoor weather-resistant, wear-resistant and high-impact PC sheet coating according to claim 6 is characterized by: In the step 4, the buffer layer coating is applied, the surface is dried, and then the surface coating is applied. The surface drying temperature is 85-95° C. and the surface drying time is 15-25 minutes.

9. The outdoor weather-resistant, wear-resistant and high-impact PC sheet coating according to claim 6 is characterized by: The surface coating is cured after coating, the curing temperature is 70-85° C., and the curing time is 30-60 minutes.

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