High antistatic powder coating for electronic product shelves and preparation method thereof

Abstract

The present invention relates to a high antistatic powder coating for electronic product shelves, wherein the raw materials are, by weight, 20 to 40 parts of bisphenol A epoxy resin, 30 to 45 parts of phenolic modified resin, 25 to 30 parts of brominated resin, 15 to 25 parts of curing agent, 50 to 70 parts of functional filler, 8 to 15 parts of functional auxiliary agent, 3 to 5 parts of dispersant, 1 to 3 parts of transparent polyimide particles, 1 to 3 parts of zirconium oxide ceramic particles, 0.5 to 2 parts of nano titanium dioxide, and 0.5 to 2 parts of carbon nanotubes. The present invention also relates to a preparation method of a high antistatic powder coating for electronic product shelves, wherein the solid particles in the prepared powder coating can build a good continuous connection system by combining different particle sizes, thereby forming a good functional particle path in the system, enhancing the electron transmission speed and dissipation effect, and having a good antistatic effect.

Description

Technical Field

[0001] The invention relates to the technical field of powder coating preparation, in particular to a high antistatic powder coating for electronic product shelves and a preparation method thereof. Background Art

[0002] Powder coating is a coating formed by solid particles, which has two main components: solid particles and liquid matrix in solvent, but in actual application, it does not contain solvent. These solid particles are usually composed of raw materials such as resin (such as epoxy resin, polyester resin, etc.), pigment, filler and additives. High antistatic powder coating for electronic product shelves is a coating formed by solid particles. It does not contain solvent, but is composed of fine granular solids. These solid particles contain epoxy, polyester resin and fillers and metal powders with good conductivity, which are mainly used for antistatic and static elimination.

[0003] The main problems of powder coating in anti-static are static breakdown and charge repulsion. Static breakdown is caused by the static electricity generated by friction, contact and separation during the spraying process of powder coating. When static electricity accumulates to a certain extent, it may affect the quality and safety of coating construction. Charge repulsion is caused by static electricity accumulation, which causes the powder coating to fail to work properly and affects the coating effect.

[0004] Therefore, it is expected to provide a high antistatic powder coating for electronic product shelves and a preparation method thereof, which can solve the above technical problems. Summary of the invention

[0005] The first object of the present invention is to provide a high antistatic powder coating for electronic product shelves. The raw materials are, by mass, 20 to 40 parts of bisphenol A epoxy resin, 30 to 45 parts of phenolic modified resin, 25 to 30 parts of brominated resin, 15 to 25 parts of curing agent, 50 to 70 parts of functional filler, 8 to 15 parts of functional additive, 3 to 5 parts of dispersant, 1 to 3 parts of transparent polyimide particles, 1 to 3 parts of zirconium oxide ceramic particles, 0.5 to 2 parts of nano titanium dioxide, and 0.5 to 2 parts of carbon nanotubes.

[0006] The second object of the present invention is to provide a method for preparing a high antistatic powder coating for electronic product shelves, comprising the following steps:

[0007] S1. Raw material pretreatment: drying of bisphenol A epoxy resin and curing agent;

[0008] S2. Premixing: In a dry mixing chamber, weigh the raw materials of each component, add all the components according to the proportion into a high-speed mixer, and stir and mix them evenly until there is no stratification or heterochromaticity to obtain a mixed material;

[0009] S3, putting the pre-mixed mixture into a twin-screw extruder, melting it and mixing it evenly through a set temperature section, and then immediately cooling and solidifying the molten mixture through a cooling system after it is extruded from the extruder, and finally crushing the cooled material through a crusher;

[0010] S4. Mix the sieved powder with the modified silane additive again, and use a mechanical stirrer or a high-speed disperser to perform surface coating treatment.

[0011] Specifically, in step S2, in a dry mixing chamber, weigh each component raw material, add all components in proportion into a high-speed mixer at 3000 rpm, and mix for 5 to 10 minutes to ensure that each raw material is initially evenly dispersed.

[0012] Specifically, in step S3, the cooled material is crushed by a pulverizer, and then sieved by a screening device with 50-60 meshes to obtain a powder coating with uniform particle size.

[0013] Specifically, in step S4, the specific time is 30 to 40 minutes to ensure that each particle of the powder coating is evenly coated, and then the treated powder coating is dried for another 2 hours at 90°C.

[0014] Specifically, after step S4, the method further includes step S5 of packaging and storing, wherein the prepared anticorrosive powder coating is packed into moisture-proof bags or barrels and sealed and stored in a dry and cool environment.

[0015] The high antistatic powder coating for electronic product shelves and the preparation method thereof of the present invention have the following advantages compared with the prior art:

[0016] (1) The solid particles in the prepared powder coating can build a good continuous connection system by combining different particle sizes, thereby forming a good functional particle pathway in the system, enhancing the electron transmission speed and dissipation effect, and having a good antistatic effect;

[0017] (2) Simplification of production process. DETAILED DESCRIPTION

[0018] The present invention is further described below in conjunction with specific embodiments.

[0019] Example 1

[0020] A high antistatic powder coating for electronic product shelves, the raw materials of which are, by weight, 21 parts of bisphenol A epoxy resin, 35 parts of phenolic modified resin, 25 parts of brominated resin, 20 parts of curing agent, 50 parts of functional filler, 8 parts of functional auxiliary agent, 3 parts of dispersant, 2 parts of transparent polyimide particles, 2 parts of zirconium oxide ceramic particles, 0.8 parts of nano titanium dioxide and 1 part of carbon nanotubes.

[0021] A method for preparing a high antistatic powder coating for electronic product shelves comprises the following steps:

[0022] S1. Raw material pretreatment: drying of bisphenol A epoxy resin and curing agent;

[0023] S2. Premixing: In a dry mixing chamber, weigh the raw materials of each component, add all the components according to the proportion into a high-speed mixer, and stir and mix them evenly until there is no stratification or heterochromaticity to obtain a mixed material;

[0024] S3, putting the pre-mixed mixture into a twin-screw extruder, melting it and mixing it evenly through a set temperature section, and then immediately cooling and solidifying the molten mixture through a cooling system after it is extruded from the extruder, and finally crushing the cooled material through a crusher;

[0025] S4. Mix the sieved powder with the modified silane additive again, and use a mechanical stirrer or a high-speed disperser to perform surface coating treatment.

[0026] Specifically, in step S2, in a dry mixing chamber, weigh each component raw material, add all components in proportion into a high-speed mixer at 3000 rpm, and mix for 5 minutes to ensure that each raw material is initially evenly dispersed.

[0027] Specifically, in step S3, the cooled material is crushed by a crusher, and then sieved through 50 meshes using a screening device to obtain a powder coating with uniform particle size.

[0028] Specifically, in step S4, the specific time is 30 minutes to ensure that each particle of the powder coating is evenly coated, and then the treated powder coating is dried for another 2 hours at 90°C.

[0029] Example 2

[0030] The raw materials are, in parts by mass: 30 parts of bisphenol A epoxy resin, 45 parts of phenolic modified resin, 30 parts of brominated resin, 20 parts of curing agent, 60 parts of functional filler, 10 parts of functional additive, 4 parts of dispersant, 2 parts of transparent polyimide particles, 2 parts of zirconium oxide ceramic particles, 1.3 parts of nano-titanium dioxide, and 0.8 parts of carbon nanotubes.

[0031] A method for preparing a high antistatic powder coating for electronic product shelves comprises the following steps:

[0032] S1. Raw material pretreatment: drying of bisphenol A epoxy resin and curing agent;

[0033] S2. Premixing: In a dry mixing chamber, weigh the raw materials of each component, add all the components according to the proportion into a high-speed mixer, and stir and mix them evenly until there is no stratification or heterochromaticity to obtain a mixed material;

[0034] S3, putting the pre-mixed mixture into a twin-screw extruder, melting it and mixing it evenly through a set temperature section, and then immediately cooling and solidifying the molten mixture through a cooling system after it is extruded from the extruder, and finally crushing the cooled material through a crusher;

[0035] S4. Mix the sieved powder with the modified silane additive again, and use a mechanical stirrer or a high-speed disperser to perform surface coating treatment.

[0036] Specifically, in step S2, in a dry mixing chamber, weigh each component raw material, add all components in proportion into a high-speed mixer at 3000 rpm, and mix for 8 minutes to ensure that each raw material is initially evenly dispersed.

[0037] Specifically, in step S3, the cooled material is crushed by a crusher, and then sieved through 60 meshes using a screening device to obtain a powder coating with uniform particle size.

[0038] Specifically, in step S4, the specific time is 35 minutes to ensure that each particle of the powder coating is evenly coated, and then the treated powder coating is dried for another 2 hours at 90°C.

[0039] Example 3

[0040] The raw materials are, by mass, 20 parts of bisphenol A epoxy resin, 30 parts of phenolic modified resin, 25-30 parts of brominated resin, 15 parts of curing agent, 70 parts of functional filler, 12 parts of functional additive, 3 parts of dispersant, 1-3 parts of transparent polyimide particles, 3 parts of zirconium oxide ceramic particles, 2 parts of nano-titanium dioxide, and 2 parts of carbon nanotubes.

[0041] A method for preparing a high antistatic powder coating for electronic product shelves comprises the following steps:

[0042] S1. Raw material pretreatment: drying of bisphenol A epoxy resin and curing agent;

[0043] S2. Premixing: In a dry mixing chamber, weigh the raw materials of each component, add all the components according to the proportion into a high-speed mixer, and stir and mix them evenly until there is no stratification or heterochromaticity to obtain a mixed material;

[0044] S3, putting the pre-mixed mixture into a twin-screw extruder, melting it and mixing it evenly through a set temperature section, and then immediately cooling and solidifying the molten mixture through a cooling system after it is extruded from the extruder, and finally crushing the cooled material through a crusher;

[0045] S4. Mix the sieved powder with the modified silane additive again, and use a mechanical stirrer or a high-speed disperser to perform surface coating treatment.

[0046] Specifically, in step S2, in a dry mixing chamber, weigh each component raw material, add all components in proportion into a high-speed mixer at 3000 rpm, and mix for 10 minutes to ensure that each raw material is initially evenly dispersed.

[0047] Specifically, in step S3, the cooled material is crushed by a crusher, and then sieved through 60 meshes using a screening device to obtain a powder coating with uniform particle size.

[0048] Specifically, in step S4, the specific time is 40 minutes to ensure that each particle of the powder coating is evenly coated, and then the treated powder coating is dried for another 2 hours at 90°C.

[0049] Specifically, after step S4, the method further includes step S5 of packaging and storing, wherein the prepared anticorrosive powder coating is packed into moisture-proof bags or barrels and sealed and stored in a dry and cool environment.

[0050] Example 4

[0051] The raw materials are, by mass, 35 parts of bisphenol A epoxy resin, 45 parts of phenolic modified resin, 30 parts of brominated resin, 15 parts of curing agent, 60 parts of functional filler, 9 parts of functional additive, 4 parts of dispersant, 1 part of transparent polyimide particles, 1 part of zirconium oxide ceramic particles, 0.9 parts of nano-titanium dioxide, and 2 parts of carbon nanotubes.

[0052] A method for preparing a high antistatic powder coating for electronic product shelves comprises the following steps:

[0053] S1. Raw material pretreatment: drying of bisphenol A epoxy resin and curing agent;

[0054] S2. Premixing: In a dry mixing chamber, weigh the raw materials of each component, add all the components according to the proportion into a high-speed mixer, and stir and mix them evenly until there is no stratification or heterochromaticity to obtain a mixed material;

[0055] S3, putting the pre-mixed mixture into a twin-screw extruder, melting it and mixing it evenly through a set temperature section, and then immediately cooling and solidifying the molten mixture through a cooling system after it is extruded from the extruder, and finally crushing the cooled material through a crusher;

[0056] S4. Mix the sieved powder with the modified silane additive again, and use a mechanical stirrer or a high-speed disperser to perform surface coating treatment.

[0057] Specifically, in step S2, in a dry mixing chamber, weigh each component raw material, add all components in proportion into a high-speed mixer at 3000 rpm, and mix for 8 minutes to ensure that each raw material is initially evenly dispersed.

[0058] Specifically, in step S3, the cooled material is crushed by a crusher, and then sieved through 55 meshes using a screening device to obtain a powder coating with uniform particle size.

[0059] Specifically, in step S4, the specific time is 40 minutes to ensure that each particle of the powder coating is evenly coated, and then the treated powder coating is dried for another 2 hours at 90°C.

[0060] Specifically, after step S4, the method further includes step S5 of packaging and storing, wherein the prepared anticorrosive powder coating is packed into a moisture-proof bag or barrel and sealed and stored in a dry and cool environment.

[0061] The performance tests of the products prepared in Examples 1 to 4 are shown in Table 1:

[0062] Flame retardancy: flame retardancy test was conducted on epoxy powder coatings prepared in the examples and comparative examples with reference to standard MT113-1995, and the test value was based on the specific flaming combustion time;

[0063] Antistatic property: The antistatic property of the epoxy powder coatings prepared in the examples and comparative examples was tested with reference to the standard MT113-1995, and the test value was based on the specific resistance;

[0064] Waterproof property: The epoxy powder coatings prepared in the examples and comparative examples were used to prepare fusion-bonded coatings, the coating thickness was 1.5 mm, and the surface water contact angle test was performed on the fusion-bonded coatings prepared in the examples and comparative examples;

[0065] Aging resistance: The epoxy powder coatings prepared in the examples and comparative examples were used to prepare fusion-bonded coatings with a coating thickness of 1.5 mm. The coating samples were placed in a constant temperature and humidity chamber at 65±2°C and 75% humidity for 3 months. After 3 months, the samples were taken out for observation. If cracking, oxidation, blistering, or shedding occurred, the samples were considered unqualified. Otherwise, the samples were considered qualified.

[0066] Wear resistance: The epoxy powder coatings prepared in the examples and comparative examples were tested for wear resistance according to the standard GB / T1768-2006;

[0067] Salt spray corrosion resistance: With reference to standard GB / T1771-2007, the epoxy powder coatings prepared in the examples and comparative examples were subjected to salt spray corrosion resistance for 1000 h to observe whether there were blistering, cracking, rust or oxidation.

[0068]

[0069]

[0070] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A high antistatic powder coating for electronic product shelves, characterized in that: The raw materials are, in parts by mass, 20 to 40 parts of bisphenol A epoxy resin, 30 to 45 parts of phenolic modified resin, 25 to 30 parts of brominated resin, 15 to 25 parts of curing agent, 50 to 70 parts of functional filler, 8 to 15 parts of functional additive, 3 to 5 parts of dispersant, 1 to 3 parts of transparent polyimide particles, 1 to 3 parts of zirconium oxide ceramic particles, 0.5 to 2 parts of nano titanium dioxide, and 0.5 to 2 parts of carbon nanotubes.

2. The method for preparing a highly antistatic powder coating for electronic product shelves according to claim 1, characterized in that: The following steps are included: S1. Raw material pretreatment: drying of bisphenol A epoxy resin and curing agent; S2. Premixing: In a dry mixing chamber, weigh the raw materials of each component, add all the components according to the proportion into a high-speed mixer, and stir and mix them evenly until there is no stratification or heterochromaticity to obtain a mixed material; S3, putting the pre-mixed mixture into a twin-screw extruder, melting it and mixing it evenly through a set temperature section, and then immediately cooling and solidifying the molten mixture through a cooling system after it is extruded from the extruder, and finally crushing the cooled material through a crusher; S4. Mix the sieved powder with the modified silane additive again, and use a mechanical stirrer or a high-speed disperser to perform surface coating treatment.

3. The method for preparing a highly antistatic powder coating for electronic product shelves according to claim 2, characterized in that: In step S2, in a dry mixing chamber, weigh each component raw material, add all components in proportion into a high-speed mixer at 3000 rpm, and mix for 5 to 10 minutes to ensure that each raw material is initially evenly dispersed.

4. The method for preparing a highly antistatic powder coating for electronic product shelves according to claim 1, characterized in that: In step S3, the cooled material is crushed by a pulverizer, and then sieved by a screening device with 50-60 meshes to obtain a powder coating with uniform particle size.

5. The method for preparing a highly antistatic powder coating for electronic product shelves according to claim 2, characterized in that: In step S4, the specific time is 30 to 40 minutes to ensure that each particle of powder coating is evenly coated, and then the treated powder coating is dried for another 2 hours at 90°C.

6. The method for preparing a highly antistatic powder coating for electronic product shelves according to claim 5, characterized in that: After step S4, the method further includes step S5 of packaging and storing, in which the prepared anticorrosive powder coating is packed into moisture-proof bags or barrels and sealed and stored in a dry and cool environment.

Images