CN111410881A - Integrated coating paint for plastic parts and preparation method and coating method thereof - Google Patents
Integrated coating paint for plastic parts and preparation method and coating method thereof Download PDFInfo
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- CN111410881A CN111410881A CN202010305696.4A CN202010305696A CN111410881A CN 111410881 A CN111410881 A CN 111410881A CN 202010305696 A CN202010305696 A CN 202010305696A CN 111410881 A CN111410881 A CN 111410881A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
- C09D133/04—Homopolymers or copolymers of esters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0254—After-treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/02—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to macromolecular substances, e.g. rubber
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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Abstract
The plastic part integrated coating paint comprises the following raw materials in parts by weight: 10-35 parts of medium-hydroxyl resin, 1-2 parts of dispersing agent, 3-5 parts of high-pigment powder, 40-55 parts of high-hydroxyl resin, 5-15 parts of polyester resin, 25-30 parts of oily environment-friendly solvent, 0.5-1 part of defoaming agent and 0.5-1 part of flatting agent. The paint disclosed by the invention is prepared into nanometer-level high-pigment color paste with excellent glossiness in advance, the nanometer-level high-pigment color paste is formed after being dissolved with polyester resin, high-hydroxyl resin, a defoaming agent, a leveling agent and the like, and the performances of the paint in all aspects such as adsorption force, glossiness, fullness, film forming thickness, weather resistance and the like can meet the use requirements of national standards. The preparation method of the plastic part integrated coating paint is simple, raw materials are easy to obtain, the cost is low, and the usability is good. And a plastic paint film can be formed only by one-time spraying and one-time baking, so that the paint coating time is greatly reduced, the spraying efficiency is improved, the VOC (volatile organic compound) emission is reduced, and the paint consumption is reduced.
Description
Technical Field
The invention belongs to the technical field of plastic part coating paint processes, and particularly relates to plastic part integrated coating paint and a preparation method and a coating method thereof.
Background
With the development of material technology, plastics are increasingly widely applied to automobiles, the decoration and durability of the plastics can be improved by coating the plastics, the coating for the plastics generally comprises primer, colored paint and varnish, the corresponding coating process for the plastics comprises three coating procedures of primer coating, middle colored paint coating and top varnish coating, baking and cooling operation are required after each coating, the process is various and complex, and each coating and baking can discharge atmospheric VOC (volatile organic compounds) pollutants, so that the plastics have a great toxic effect on human bodies and natural environment. With the increasing environmental requirements, reducing VOC emissions is a major technical challenge facing the automotive coatings industry. The automobile refinishing paint market has the first worldwide Shimada, and the special water-based paint is adopted to carry out the water-based coating process of three-coating and one-drying, so that the next coating can be continuously coated without drying operation between coating and coating operations, and the emission of carbon dioxide and VOC is reduced to a certain extent. But still need to carry out primer coating, intermediate coating color paint and top coating varnish, and the improvement of spraying efficiency and the reduction of coating dosage are very limited. The effect of reducing VOC emission is realized by applying two automobile coating processes, namely, a primer and a middle paint are improved to synthesize a novel primer which can not use a middle coating color paint, or the raw materials of the middle paint and a finishing paint are improved to synthesize a novel finishing paint which can not use the middle coating color paint, so that an automobile paint film can meet the standard requirement on the basis of saving one main coating process. Many coating companies at home and abroad are dedicated to research on a method for finishing coating an automobile paint film by further reducing a coating process so as to reduce VOC (volatile organic compound) emission and coating process difficulty, but the adsorption capacity, the glossiness, the fullness, the film forming thickness and the weather resistance of the paint film cannot simultaneously meet the standard use requirements, particularly the glossiness and the fullness are different from the standard.
Disclosure of Invention
The invention aims to provide an integrated coating paint for plastic parts, a preparation method and a coating method thereof, wherein three coating operations of priming paint, middle paint and top varnish in a plastic part coating process are replaced by one coating operation of the integrated coating paint, so that one-time integrated coating of the plastic parts is realized on the basis that the adsorption force, glossiness, fullness, film forming thickness and weather resistance of a paint film are ensured and the standard use requirements are met, the complexity of the coating process is reduced, the paint coating time is reduced, the spraying efficiency is improved, the VOC emission is reduced, and the using amount of the paint is reduced.
The technical scheme of the invention is as follows:
the plastic part integrated coating paint is characterized by comprising the following raw materials in parts by weight: 10-35 parts of medium-hydroxyl resin, 1-2 parts of dispersing agent, 3-5 parts of high-pigment powder, 40-55 parts of high-hydroxyl resin, 5-15 parts of polyester resin, 25-30 parts of oily environment-friendly solvent, 0.5-1 part of defoaming agent and 0.5-1 part of flatting agent.
Preferably, the weight part of the medium hydroxyl resin is 20-25, the weight part of the high hydroxyl resin is 40-55, and the weight part of the polyester resin is 10-15.
Preferably, the weight part of the medium hydroxyl resin is 25-35, the weight part of the high hydroxyl resin is 40-55, and the weight part of the polyester resin is 10-15.
Preferably, the weight part of the medium hydroxyl resin is 30-35, the weight part of the high hydroxyl resin is 45-50, and the weight part of the polyester resin is 10-15.
Preferably, the particle size of the high-pigment toner is at least half of the total amount of the high-pigment toner in the order of nanometers.
Preferably, the medium-hydroxyl resin is a medium-hydroxyl acrylic resin.
Preferably, the high hydroxyl resin is a high hydroxyl acrylic resin.
A preparation method of plastic part integrated coating paint,
step 1, preparing raw materials according to the parts by weight, and grinding the high-pigment toner to a nanoscale particle size by using a grinder to obtain a nanoscale high-pigment toner;
step 2, feeding the medium hydroxyl resin, the dispersing agent and the nanometer level high-grade pigment toner into a reaction kettle, dispersing for 30 minutes at a high speed according to the rotating speed of 1500 rpm to form nanometer level high-grade pigment color paste,
and 3, adding high-hydroxyl resin, polyester resin, an oily environment-friendly solvent, a defoaming agent and a flatting agent into the nanoscale high-pigment color paste, and fully and uniformly stirring to obtain the plastic piece integrated coating paint.
Preferably, the grinder is a pin-and-rod type nano grinder.
A coating method of plastic part integrated coating paint comprises the steps of 1, spraying the plastic part integrated coating paint prepared by the preparation method of the plastic part integrated coating paint to a plastic substrate, standing and leveling for 3-5 minutes;
and 2, baking the sprayed and static leveled plastic base material at 70-80 ℃ for 50-60 minutes, cooling and standing for 72 hours to form a plastic paint film with all performances meeting the national standard requirements on the surface of the plastic base material.
Compared with the prior art, the invention has the advantages that:
the plastic piece integrated coating paint adopts the medium hydroxyl resin to be deflocculated with the nanometer level high pigment toner in advance under the steric hindrance effect of the dispersant to form the nanometer level high pigment color paste with excellent glossiness, the fullness is better after the nanometer level high pigment color paste is dissolved with the polyester resin, the glossiness and the surface weather resistance of a paint film can be further improved by adding the high hydroxyl resin, and the integrated coating paint with the performances of all aspects of adsorption, glossiness, fullness, film forming thickness, weather resistance and the like which can meet the use requirements of national standards is obtained under the assistance of auxiliary agents such as a defoaming agent, a flatting agent and the like. The preparation method of the plastic part integrated coating paint is simple, raw materials are easy to obtain, the cost is low, and the usability is good. The high-pigment powder can be replaced according to the specified color required by the paint film, and the formed nano-scale high-pigment color paste has better covering power and surface fineness compared with the common color paste, the glossiness is further enhanced, a good foundation is provided for the glossiness and fullness of the paint film to reach the standard, high-hydroxyl resin, polyester resin, an oily environment-friendly solvent, a defoaming agent and a leveling agent in the nano-scale high-pigment color paste in a specified proportion are added, and after the mixture is uniformly stirred, a finished product paint capable of being integrally coated is formed, namely the plastic part integrated coating paint. According to the coating method of the plastic piece integrated coating paint, the plastic piece integrated coating paint finished product is directly sprayed on a corresponding plastic piece, the plastic piece integrated coating paint finished product is baked for 50-60 minutes at 70-80 ℃ after being statically leveled, and is kept stand and cooled for 72 hours to obtain a paint film with the performances of adsorption capacity, glossiness, fullness, film forming thickness, weather resistance and the like which can meet the use requirements of national standards, namely, the paint film is formed only by one coating process without three coating processes of priming paint coating, middle paint coating and top varnish coating, the coating process is simple, the plastic paint film can be formed only by one spraying and one baking, the paint coating time is greatly reduced, the coating efficiency is improved, the VOC emission is reduced, and the paint consumption is reduced.
Detailed Description
In order to facilitate an understanding of the invention, the invention is described in more detail below with reference to specific examples.
The embodiment of the invention adopts the following raw materials:
medium hydroxyl resin: the medium hydroxyl acrylic resin of Dustmann, Netherlands, is available from Union commercial and trade company, Guangzhou, but is not limited to the product of the company; the medium hydroxyl acrylic resin is a resin with good solubility with polyester resin, is mainly used for increasing the adhesive force and drying speed of a paint film, but has poor glossiness and fullness.
Dispersing agent: BYK163 dispersant from Bick, Germany, is available from Shenzhen Meilan high New materials GmbH, but is not limited to the company; the dispersing agent is a high molecular weight auxiliary agent, deflocculates the high pigment color paste through steric hindrance, and simultaneously, the dispersing agent interacts with the high pigment color paste and the like to increase the transparency and the covering power of a paint film.
High-color toner: carbon black FW200, available from Oakron, Germany, is available from, but not limited to, Xinnuo high materials, Inc., Guangzhou;
high hydroxyl resin: 3037 high hydroxyl acrylic resins available from Diegon (DIC) of Japan, commercially available from cobalt Pumerchandize, Guangzhou, but not limited thereto; the high hydroxyl acrylic resin can be used for improving the glossiness of a paint film and the weather resistance of the surface of the paint film, particularly the acid and alkali resistance and the gasoline corrosion resistance, but has poor adhesion to a plastic substrate.
Polyester resin: 2803 polyester resins from Zhan new company (Allnex, Nuplex Nepets) USA, commercially available from, but not limited to, the company of Rapid commerce, Guangzhou; the polyester resin can increase the fullness (DOI), the vividness and the flexibility of a paint film, but the formed paint film is too soft and is easy to scratch.
An environment-friendly solvent: diisobutyl ketone (DIBK) from DOW chemical company (DOW), available from, but not limited to, fast commercial ltd, guangzhou city; the environment-friendly solvent is an ether ester solvent with high boiling point, low surface tension and low volatility, has good solubility on paint polymers, is not easy to crack, has high solubility on polymers in a wide range, and has good solvent release performance on paint films, so that the paint films have good fluidity and uniform coating performance when being sprayed.
Leveling agent: BYK358N leveling agent from Picker, Germany, available from, but not limited to, Liliter trades, Inc. of Dongguan; the leveling agent is used for increasing the smoothness of the surface of a paint film, improving the leveling performance in the paint spraying process, preventing the formation of a Nade vortex and improving the wettability of a plastic substrate.
Defoaming agent: BYK141 defoamer, Picker, Germany, was obtained from, but not limited to, Cihel trades, Inc., Dongguan.
Example 1
The plastic part integrated coating paint 1 comprises the following raw materials in parts by weight: 10-15 parts of medium-hydroxyl resin, 1-2 parts of dispersing agent, 3-5 parts of high-pigment toner, 50-55 parts of high-hydroxyl resin, 10-15 parts of polyester resin, 25-30 parts of oily environment-friendly solvent, 0.5-1 part of defoaming agent and 0.5-1 part of flatting agent.
The preparation method of the plastic part integrated coating paint 1 comprises the following steps of 1, preparing raw materials according to the parts by weight, and grinding 3-5 parts of high-pigment toner to nanoscale particle size by a grinder to obtain the nanoscale high-pigment toner 1;
step 2, feeding 10-15 parts of medium hydroxyl resin, 1-2 parts of dispersing agent and the ground nano-grade high-pigment toner 1 into a reaction kettle, dispersing at high speed for 30 minutes at the rotating speed of 1500 rpm to form nano-grade high-pigment color paste 1,
and 3, adding 50-55 parts of high-hydroxyl resin, 10-15 parts of polyester resin, 25-30 parts of oily environment-friendly solvent, 0.5-1 part of defoaming agent and 0.5-1 part of flatting agent into the nano-grade high-pigment color paste 1, and fully and uniformly stirring to obtain the plastic piece integrated coating paint 1.
The hydroxy acrylic resin is a resin which is better in solubility with polyester resin, is mainly used for increasing the adhesive force and drying speed of a paint film, but has poor glossiness and fullness. The high hydroxyl acrylic resin can be used for improving the glossiness of a paint film and the weather resistance of the surface of the paint film, particularly the acid and alkali resistance and the gasoline corrosion resistance, but has poor adhesion to a plastic substrate. The polyester resin can increase the fullness (DOI), vividness and flexibility of a paint film, and is often used for forming a colored paint by mixing pigments, but the formed colored paint film is too soft and easy to scratch, so that the polyester resin needs to be matched with a finish paint for use. The invention creatively mixes the raw materials and comprehensively adjusts the proportion of polyester resin, high pigment color paste, medium hydroxyl acrylic resin, high hydroxyl acrylic resin and the like, particularly, the nanoscale high pigment color paste has better covering power and surface fineness than the common color paste, the defoaming agent and the leveling agent are used together to eliminate the leveling difference possibly appearing when the nanoscale high pigment color paste is coated on a horizontal plane and a vertical plane simultaneously, and the finally formed plastic part integrated coating paint 1 is nanoscale paint which has excellent leveling property, short drying time and no leveling difference on the horizontal plane and the vertical plane.
The plastic base material of the automobile plastic part comprises an ABS (Acrylonitrile butadiene styrene) plastic base material, an SAS (Sodium alkylbenzenesulfonate) plastic base material, an ABS + PC (Polycarbonate) plastic base material and the like.
Taking an automobile ABS + PC substrate as an example, the plastic part integrated coating paint 1 is sprayed on the automobile ABS + PC substrate, is subjected to standing and leveling for 3-5 minutes, is baked for 50-60 minutes at 70-80 ℃, is cooled and stands for 72 hours, and forms a plastic paint film 1 on the surface of the plastic substrate.
The paint 1 for integrally coating the plastic parts is subjected to physical and chemical property detection such as viscosity, dilution ratio, solid content and storage stability, the workability is detected, and the appearance property, the mechanical property, the stone impact resistance, the water resistance, the chemical medium resistance and the weather resistance of the plastic paint film 1 are detected, so that the national standard requirements are met.
Particularly, the following detection results are superior to the national standard requirements: 1. detecting the glossiness by using a gloss meter, wherein the glossiness is 92 degrees; 2. performing pencil hardness test, wherein the hardness is not less than HB; 3. the weather resistance is tested under the xenon arc lamp for 1800 hours of light aging, and a paint film 1 is slightly faded after the xenon arc lamp light is aged for 1800 hours; 4. soaking in water at 40 ℃ for 240 hours for water resistance detection, and slightly dulling a paint film 1 after soaking in water at 40 ℃ for 240 hours; 5. soaking in No. 92 gasoline for 4 hours for gasoline resistance detection, and slightly dulling a paint film 1 after soaking in No. 92 gasoline for 4 hours; 6. and (5) detecting the adhesive force by a grid-scribing test method, wherein the adhesive force reaches grade 1.
Example 2
The plastic part integrated coating paint 2 is prepared from 15-20 parts by weight of medium hydroxyl resin and 5-10 parts by weight of polyester resin, and is different from the raw materials in the embodiment 1.
The preparation method of the plastic part integrated coating paint 2 comprises the following steps of 1, preparing raw materials according to the parts by weight, and grinding 3-5 parts of high-pigment toner to nanoscale particle size by a grinder to obtain nanoscale high-pigment toner 2;
step 2, feeding 15-20 parts of medium hydroxyl resin, 1-2 parts of dispersing agent and the ground nano-grade high-pigment toner 2 into a reaction kettle, dispersing at high speed for 30 minutes at the rotating speed of 1500 rpm to form nano-grade high-pigment color paste 2,
and 3, adding 50-55 parts of high-hydroxyl resin, 5-10 parts of polyester resin, 25-30 parts of oily environment-friendly solvent, 0.5-1 part of defoaming agent and 0.5-1 part of flatting agent into the nano-grade high-pigment color paste 2, and fully and uniformly stirring to obtain the plastic piece integrated coating paint 2.
And spraying the plastic part integrated coating paint 2 to an automobile ABS + PC substrate, standing and leveling for 3-5 minutes, baking for 50-60 minutes at 70-80 ℃, cooling and standing for 72 hours to form a plastic paint film 2 on the surface of the plastic substrate.
The paint 2 for integrally coating the plastic parts is subjected to physical and chemical property detection such as viscosity, dilution ratio, solid content and storage stability, the workability is detected, and the appearance property, the mechanical property, the stone impact resistance, the water resistance, the chemical medium resistance and the weather resistance of the plastic paint film 2 are detected, so that the national standard requirements are met. Particularly, the following detection results are superior to the national standard requirements: 1. detecting the glossiness by using a gloss meter, wherein the glossiness is 93 degrees; 2. performing pencil hardness test, wherein the hardness is not less than HB; 3. the weather resistance is tested under the xenon arc lamp for 1800 hours of light aging, and a paint film 1 is slightly faded after the xenon arc lamp light is aged for 1800 hours; 4. soaking in water at 40 ℃ for 240 hours for water resistance detection, and slightly dulling a paint film 1 after soaking in water at 40 ℃ for 240 hours; 5. soaking in No. 92 gasoline for 4 hours for gasoline resistance detection, and slightly dulling a paint film 1 after soaking in No. 92 gasoline for 4 hours; 6. and (5) detecting the adhesive force by a grid-scribing test method, wherein the adhesive force reaches grade 1.
Example 3
The plastic part integrated coating paint 3 comprises the following raw materials in parts by weight: 20-25 parts of medium hydroxyl resin, 1-2 parts of dispersing agent, 3-5 parts of high pigment powder, 45-50 parts of high hydroxyl resin, 5-10 parts of polyester resin, 25-30 parts of oily environment-friendly solvent, 0.5-1 part of defoaming agent and 0.5-1 part of flatting agent.
The preparation method of the plastic part integrated coating paint 3 comprises the following steps of 1, preparing raw materials according to the parts by weight, and grinding 3-5 parts of high-pigment toner to nanoscale particle size by a grinder to obtain nanoscale high-pigment toner 3;
step 2, feeding 20-25 parts of medium hydroxyl resin, 1-2 parts of dispersing agent and the ground nano-grade high-pigment toner 3 into a reaction kettle, dispersing at high speed for 30 minutes at the rotating speed of 1500 rpm to form nano-grade high-pigment color paste 3,
and 3, adding 45-50 parts of high-hydroxyl resin, 5-10 parts of polyester resin, 25-30 parts of oily environment-friendly solvent, 0.5-1 part of defoaming agent and 0.5-1 part of flatting agent into the nano-grade high-pigment color paste 3, and fully and uniformly stirring to obtain the plastic piece integrated coating paint 3.
And spraying the plastic part integrated coating paint 3 to an automobile ABS + PC substrate, standing and leveling for 3-5 minutes, baking for 50-60 minutes at 70-80 ℃, cooling and standing for 72 hours to form a plastic paint film 3 on the surface of the plastic substrate.
The paint 3 for integrally coating the plastic parts is subjected to physical and chemical property detection such as viscosity, dilution ratio, solid content and storage stability, the workability is detected, and the appearance property, the mechanical property, the stone impact resistance, the water resistance, the chemical medium resistance and the weather resistance of the plastic paint film 3 are detected, so that the national standard requirements are met.
Particularly, the following detection results are superior to the national standard requirements: 1. detecting the glossiness by using a gloss meter, wherein the glossiness is 94 degrees; 2. performing pencil hardness test, wherein the hardness is not less than HB; 3. the weather resistance is tested under the xenon arc lamp for 1800 hours of light aging, and a paint film 1 is slightly faded after the xenon arc lamp light is aged for 1800 hours; 4. soaking in water at 40 ℃ for 240 hours for water resistance detection, wherein a paint film 1 is unchanged after soaking in water at 40 ℃ for 240 hours; 5. soaking in 92# gasoline for 4 hours for gasoline resistance detection, wherein a paint film 1 is unchanged after soaking in 92# gasoline for 4 hours; 6. and (5) detecting the adhesive force by a grid-scribing test method, wherein the adhesive force reaches grade 1.
Example 4
The plastic part integrated coating paint 4 comprises the following raw materials in parts by weight: 25-30 parts of medium hydroxyl resin, 1-2 parts of dispersing agent, 3-5 parts of high pigment powder, 40-45 parts of high hydroxyl resin, 10-15 parts of polyester resin, 25-30 parts of oily environment-friendly solvent, 0.5-1 part of defoaming agent and 0.5-1 part of flatting agent.
The preparation method of the plastic part integrated coating paint 4 comprises the following steps of 1, preparing raw materials according to the parts by weight, and grinding 3-5 parts of high-pigment toner to nanoscale particle size by a grinder to obtain nanoscale high-pigment toner 4;
step 2, feeding 25-30 parts of medium hydroxyl resin, 1-2 parts of dispersing agent and the ground nano-grade high-pigment toner 4 into a reaction kettle, dispersing at high speed for 30 minutes at the rotating speed of 1500 rpm to form nano-grade high-pigment color paste 4,
and 3, adding 40-45 parts of high-hydroxyl resin, 10-15 parts of polyester resin, 25-30 parts of oily environment-friendly solvent, 0.5-1 part of defoaming agent and 0.5-1 part of flatting agent into the nano-grade high-pigment color paste 4, and fully and uniformly stirring to obtain the plastic piece integrated coating paint 4.
And spraying the plastic part integrated coating paint 4 to an automobile ABS + PC substrate, standing and leveling for 3-5 minutes, baking for 50-60 minutes at 70-80 ℃, cooling and standing for 72 hours to form a plastic paint film 4 on the surface of the plastic substrate.
The paint 4 for integrally coating the plastic parts is subjected to physical and chemical property detection such as viscosity, dilution ratio, solid content and storage stability, the workability is detected, and the appearance property, the mechanical property, the stone impact resistance, the water resistance, the chemical medium resistance and the weather resistance of the plastic paint film 4 are detected, so that the national standard requirements are met.
Particularly, the following detection results are superior to the national standard requirements: 1. detecting the glossiness by using a gloss meter, wherein the glossiness is 95 degrees; 2. performing pencil hardness test, wherein the hardness is not less than HB; 3. the weather resistance is tested under the xenon arc lamp for 1800 hours, and the paint film 1 is not changed after the xenon arc lamp is aged for 1800 hours; 4. soaking in water at 40 ℃ for 240 hours for water resistance detection, wherein a paint film 1 is unchanged after soaking in water at 40 ℃ for 240 hours; 5. soaking in 92# gasoline for 4 hours for gasoline resistance detection, wherein a paint film 1 is unchanged after soaking in 92# gasoline for 4 hours; 6. and (5) detecting the adhesive force by a grid-scribing test method, wherein the adhesive force reaches a 0-hundred-grid level.
Example 5
The plastic part integrated coating paint 5 comprises the following raw materials in parts by weight: 30-35 parts of medium hydroxyl resin, 1-2 parts of dispersing agent, 3-5 parts of high pigment powder, 45-50 parts of high hydroxyl resin, 10-15 parts of polyester resin, 25-30 parts of oily environment-friendly solvent, 0.5-1 part of defoaming agent and 0.5-1 part of flatting agent.
The preparation method of the plastic part integrated coating paint 5 comprises the following steps of 1, preparing raw materials according to the parts by weight, and grinding 3-5 parts of high-pigment toner to nanoscale particle size by a grinder to obtain nanoscale high-pigment toner 5;
step 2, feeding 30-35 parts of medium hydroxyl resin, 1-2 parts of dispersing agent and the ground nano-grade high-pigment toner 5 into a reaction kettle, dispersing at high speed for 30 minutes at the rotating speed of 1500 rpm to form nano-grade high-pigment color paste 5,
and 3, adding 45-50 parts of high-hydroxyl resin, 10-15 parts of polyester resin, 25-30 parts of oily environment-friendly solvent, 0.5-1 part of defoaming agent and 0.5-1 part of flatting agent into the nano-grade high-pigment color paste 5, and fully and uniformly stirring to obtain the plastic piece integrated coating paint 5.
And spraying the plastic part integrated coating paint 5 to an automobile ABS + PC substrate, standing and leveling for 3-5 minutes, baking for 50-60 minutes at 70-80 ℃, cooling and standing for 72 hours to form a plastic paint film 5 on the surface of the plastic substrate.
The paint 5 for integrally coating the plastic parts is subjected to physical and chemical property detection such as viscosity, dilution ratio, solid content and storage stability, the workability is detected, and the appearance property, the mechanical property, the stone impact resistance, the water resistance, the chemical medium resistance and the weather resistance of the plastic paint film 5 are detected, so that the national standard requirements are met.
Particularly, the following detection results are superior to the national standard requirements: 1. detecting the glossiness by using a gloss meter, wherein the glossiness is 96 degrees; 2. performing pencil hardness test, wherein the hardness is not less than HB; 3. the weather resistance is tested under the xenon arc lamp for 1800 hours, and the paint film 1 is not changed after the xenon arc lamp is aged for 1800 hours; 4. soaking in water at 40 ℃ for 240 hours for water resistance detection, wherein a paint film 1 is unchanged after soaking in water at 40 ℃ for 240 hours; 5. soaking in 92# gasoline for 4 hours for gasoline resistance detection, wherein a paint film 1 is unchanged after soaking in 92# gasoline for 4 hours; 6. and (5) detecting the adhesive force by a grid-scribing test method, wherein the adhesive force reaches a 0-hundred-grid level.
The following table is a summary table of the detection results of the plastic paint films 1-6 of the above examples, and analysis shows that the gloss of the paint film of the plastic part integrated coating paint of the present invention gradually increases with the increase of the amount of the medium hydroxyl acrylic resin, and the gloss, weather resistance, water resistance, gasoline resistance and adhesion of the plastic paint film are the best when the amount of the medium hydroxyl acrylic resin is 20-35 parts by weight, the amount of the high hydroxyl acrylic resin is 40-45 parts by weight and the amount of the polyester resin is 10-15 parts by weight.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. The plastic part integrated coating paint is characterized by comprising the following raw materials in parts by weight: 10-35 parts of medium-hydroxyl resin, 1-2 parts of dispersing agent, 3-5 parts of high-pigment powder, 40-55 parts of high-hydroxyl resin, 5-15 parts of polyester resin, 25-30 parts of oily environment-friendly solvent, 0.5-1 part of defoaming agent and 0.5-1 part of flatting agent.
2. The integrated paint for coating plastic parts according to claim 1, wherein the weight parts of the medium hydroxyl resin are 20-25, the weight parts of the high hydroxyl resin are 40-55, and the weight parts of the polyester resin are 10-15.
3. The integrated paint for coating plastic parts according to claim 1, wherein the weight parts of the medium hydroxyl resin are 25 to 35, the weight parts of the high hydroxyl resin are 40 to 55, and the weight parts of the polyester resin are 10 to 15.
4. The integrated paint for coating plastic parts according to claim 2, wherein the weight parts of the medium hydroxyl resin are 30-35, the weight parts of the high hydroxyl resin are 45-50, and the weight parts of the polyester resin are 10-15.
5. The paint for integrally coating plastic parts according to any one of claims 1 to 4, wherein the high-pigment toner has a particle size of a nanometer order of more than half of the total amount thereof.
6. The paint for integrally coating a plastic part according to any one of claims 1 to 4, wherein the medium hydroxyl resin is a medium hydroxyl acrylic resin.
7. The paint for integrally coating a plastic part according to any one of claims 1 to 4, wherein the high hydroxyl resin is a high hydroxyl acrylic resin.
8. A preparation method of plastic part integrated coating paint is characterized in that,
step 1, preparing raw materials according to the parts by weight of any one of claims 1 to 4, and grinding the high-pigment toner to a nanoscale particle size by using a grinder to obtain a nanoscale high-pigment toner;
step 2, feeding the medium hydroxyl resin, the dispersing agent and the nanometer level high-grade pigment toner into a reaction kettle, dispersing for 30 minutes at a high speed according to the rotating speed of 1500 rpm to form nanometer level high-grade pigment color paste,
and 3, adding high-hydroxyl resin, polyester resin, an oily environment-friendly solvent, a defoaming agent and a flatting agent into the nanoscale high-pigment color paste, and fully and uniformly stirring to obtain the plastic piece integrated coating paint.
9. The method of claim 8, wherein the grinder is a pin-type nano grinder.
10. A coating method for integrally coating paint on plastic parts is characterized in that,
step 1, spraying the plastic part integrated coating paint prepared by the preparation method of the plastic part integrated coating paint according to claim 8 or 9 on a plastic substrate, and standing and leveling for 3-5 minutes;
and 2, baking the sprayed and static leveled plastic base material at 70-80 ℃ for 50-60 minutes, cooling and standing for 72 hours to form a plastic paint film with all performances meeting the national standard requirements on the surface of the plastic base material.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010305696.4A CN111410881A (en) | 2020-04-17 | 2020-04-17 | Integrated coating paint for plastic parts and preparation method and coating method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010305696.4A CN111410881A (en) | 2020-04-17 | 2020-04-17 | Integrated coating paint for plastic parts and preparation method and coating method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115637101A (en) * | 2022-11-08 | 2023-01-24 | 广东安捷伦新材料科技有限公司 | Varnish for automotive interior parts and preparation method thereof |
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