CN109280477B - Preparation method of colored dual-curing UV (ultraviolet) coating - Google Patents
Preparation method of colored dual-curing UV (ultraviolet) coating Download PDFInfo
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- CN109280477B CN109280477B CN201811090757.9A CN201811090757A CN109280477B CN 109280477 B CN109280477 B CN 109280477B CN 201811090757 A CN201811090757 A CN 201811090757A CN 109280477 B CN109280477 B CN 109280477B
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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
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
- C09D175/14—Polyurethanes having carbon-to-carbon unsaturated bonds
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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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
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- 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
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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Abstract
The invention discloses a preparation method of a colored dual-curing UV (ultraviolet) coating, belonging to the field of coating preparation. The invention comprises the following steps: firstly, mixing tetra-functional hydroxyl polyurethane acrylic resin, four-official aliphatic polyurethane acrylic resin, three-official aliphatic polyurethane acrylic resin, six-official aliphatic polyurethane acrylic resin and TMPTA monomer to obtain a mixture A; secondly, adding butyl acetate into an ultraviolet initiator and stirring to obtain a mixture B; thirdly, adding the mixture B into the mixture A, adding a flatting agent and stirring to obtain a mixture C; fourthly, adding the black slurry into the mixture C, and stirring to obtain a mixture D; and fifthly, adding ethyl acetate and butyl acetate into the mixture D, uniformly stirring and filtering to obtain the composite material. The invention overcomes the defects that the automotive upholstery needs to be sprayed twice and the production efficiency is lower in the prior art, and the formed paint film has the performances of solvent resistance, water resistance and the like, can improve the current secondary spraying effect, saves energy and improves the production efficiency.
Description
Technical Field
The invention relates to the technical field of paint preparation, in particular to a preparation method of a colored dual-curing UV paint.
Background
Nowadays, with the enhancement of environmental awareness and the development of polymer science of people, the demand for environment-friendly coatings is higher and higher, and domestic enterprises are gradually tightening the indexes of VOC content of the coatings for searching competitive advantages, and developing and applying the environment-friendly coatings. The UV paint belongs to an environment-friendly coating and has the advantages of high curing speed and high working efficiency, so that the research and development of the automotive interior UV gloss oil series paint are in line with the market trend, and the application of the automotive interior UV gloss oil series paint in automotive interiors has extremely wide prospect. The requirement on high-end automobile interior parts is higher and higher, and the prior 2-time spraying of black primer and UV paint is improved, so that the energy is saved, and the production efficiency is improved.
After retrieval, the method comprises the following steps: 2015107419720, filing date: 11, month and 4 in 2015, the invention is named as: a photo-thermal dual-cured hydrophilic anti-fog coating composition, which discloses a photo-thermal dual-cured hydrophilic anti-fog coating composition; the composition comprises 32-50 parts of hydrophilic thermosetting resin, 10-15 parts of a water-based curing agent, 10-20 parts of a hydroxyl-containing acrylate monomer, 10-20 parts of a polymerizable surfactant and 0.5-1 part of a photoinitiator; 5-10 parts of a cosolvent; and 400 parts of water. The application can be applied to the surface of a plastic substrate, is firstly subjected to thermosetting and then is subjected to photocuring, has excellent continuous antifogging property and wear resistance, has good adhesive force to the plastic substrate, can be widely applied to antifogging vehicle window films, automobile antifogging headlights, bathroom mirrors and the like, and has good application prospect.
Also as in chinese patent application No.: 201110027968X, filing date: the invention is named as follows in 2011, 1 month and 26 days: the ultraviolet curing UV coating is prepared by mixing polyester acrylate serving as a main component, an initiator and an auxiliary agent serving as curing agents, a leveling agent organic solvent serving as an auxiliary material and a functional methacrylate active monomer serving as a regulator. The preparation method comprises three stages of material preparation, stirring dispersion and modulation. The application is suitable for BMC, PET and PC materials, the product performance is durable, the ROHS instruction requirement is met, the standard of interior coatings for markets, automobiles, motorcycles and car lamps can be completely met and surpassed, and the universality is strong. In summary, the above applications relate to a cured coating and preparation thereof, but the above applications cannot solve the defect that the current automotive interior parts need to be sprayed twice, and the product performance is still worth further improvement.
Disclosure of Invention
1. Technical problem to be solved by the invention
The invention aims to overcome the defects that the automotive upholstery needs to be sprayed twice and the production efficiency is low in the prior art, and provides a preparation method of a colored dual-curing UV coating.
2. Technical scheme
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
the invention discloses a preparation method of a colored dual-curing UV coating, which comprises the following steps:
preparing various raw materials, and uniformly mixing tetra-functional hydroxyl polyurethane acrylic resin, four-official aliphatic polyurethane acrylic resin, three-official aliphatic polyurethane acrylic resin, six-official aliphatic polyurethane acrylic resin and TMPTA monomer under the condition of stirring in a dark place to obtain a mixture A;
stirring part of butyl acetate, adding an ultraviolet light initiator under the stirring condition, and uniformly stirring to obtain a mixture B;
adding the mixture B into the mixed mixture A under the stirring condition, adding the leveling agent, and stirring for 10-20min to obtain a mixture C;
step four, adding the black paste into the mixture C under the stirring condition, and uniformly stirring for 10-20 min; obtaining a mixture D;
and step five, adding ethyl acetate and the residual butyl acetate into the mixture D under the stirring condition, uniformly stirring, regulating the viscosity to 20-30S (25 ℃, NK-2), and filtering to obtain the product.
Furthermore, the raw materials comprise the following raw materials in parts by weight:
furthermore, the weight part of the butyl acetate added in the second step is the same as that of the butyl acetate added in the fifth step.
Further, the stirring condition in the first step is 600-; the stirring conditions in the rest steps are 300-700 r/min.
Furthermore, the six-membered aliphatic polyurethane acrylic resin is a polyurethane acrylic oligomer; the three-part aliphatic polyurethane acrylic resin and the four-part aliphatic polyurethane acrylic resin are aliphatic polyurethane acrylate oligomers; the tetrafunctional hydroxyl polyurethane acrylic resin is a polyurethane acrylic oligomer containing hydroxyl; the TMPTA monomer is a trifunctional acrylic oligomer.
Furthermore, the four-part aliphatic polyurethane acrylic resin comprises the following raw materials in parts by weight:
8-15 parts of four-part aliphatic polyurethane acrylic resin A;
8-15 parts of four-part aliphatic polyurethane acrylic resin B;
furthermore, the ultraviolet initiator comprises the following raw materials in parts by mass:
1841-3 parts of an ultraviolet initiator;
1-3 parts of ultraviolet initiator TPO;
and 9071-3 parts of an ultraviolet initiator.
Further, the leveling agent is a BYK-333 type leveling agent.
Furthermore, the black paste is a high pigment carbon black milled paste, wherein the content of carbon black is not higher than 10%.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following remarkable effects:
(1) the preparation method of the colored dual-curing UV coating improves the two spraying modes of the conventional black primer and the UV coating, thereby saving energy and improving production efficiency, and a paint film formed by the coating of the colored dual-curing UV coating can realize complete curing and crosslinking, has no residual solvent and no after tack, has good dispersibility, moderate leveling property and moderate thixotropy during spraying, ensures that the coating is uniform, has no obvious orange peel, no pinhole bubble and no impurity point, has a full paint surface, has good glossiness, and meets the production requirement standard.
(2) According to the preparation method of the colored dual-curing UV coating, the crosslinking density of the coating after curing is greatly higher than that of a hot-baking coating, the performance indexes of a coating in all aspects of hardness, wear resistance, acid and alkali resistance, salt mist resistance, gasoline resistance and other organic solvents are high, and particularly the coating is plump, glossy, smooth in surface, fast in UV coating curing speed and high in production efficiency.
Drawings
FIG. 1 is a schematic flow diagram of a method for preparing a colored dual cure UV coating of the present invention;
fig. 2 is a schematic flow diagram of a method of using the colored dual cure UV coating of the present invention.
Detailed Description
For a further understanding of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The present invention will be further described with reference to the following examples.
Example 1
As shown in fig. 1 and fig. 2, the preparation method of the colored dual-curing UV coating of the present embodiment includes the following raw materials in parts by weight:
20 parts of tetra-functional hydroxyl polyurethane acrylic resin;
18 parts of four-part aliphatic polyurethane acrylic resin;
wherein the four-part aliphatic polyurethane acrylic resin comprises: 9 parts by weight of four-part aliphatic polyurethane acrylic resin A and 9 parts by weight of four-part aliphatic polyurethane acrylic resin B;
wherein the ultraviolet initiator comprises 2 parts by weight of an ultraviolet initiator A, 1.5 parts by weight of an ultraviolet initiator B and 2 parts by weight of an ultraviolet initiator C;
in the embodiment, the six-membered aliphatic polyurethane acrylic resin is a polyurethane acrylic oligomer; the three-part aliphatic polyurethane acrylic resin and the four-part aliphatic polyurethane acrylic resin are aliphatic polyurethane acrylate oligomers; the tetrafunctional hydroxyl polyurethane acrylic resin is a polyurethane acrylic oligomer containing hydroxyl; the TMPTA monomer is a trifunctional acrylic oligomer.
In this embodiment, a product of type EB8210 from the new resin (shanghai) co.ltd. can be selected for the tetra-functional hydroxyl urethane acrylate resin, a product of type CN8000 from sartomer guangzhou chemical co.ltd. is selected for the tetra-functional aliphatic urethane acrylate resin a, a product of type CN8007 from sartomer guangzhou chemical co.ltd. is selected for the tetra-functional aliphatic urethane acrylate resin B, the tetra-functional aliphatic urethane acrylate resin a contributes to enhancing adhesion to a substrate, the tetra-functional aliphatic urethane acrylate resin B contributes to enhancing flexibility, and the two are compounded to realize performance balance of the product; the three-official aliphatic polyurethane acrylic resin is a model UV-787 product of Jiuyi commercial Limited, Guangzhou, the six-official aliphatic polyurethane acrylic resin is a model GD-400 product of Guangxin chemical Limited, Shenzhen, and the TMPTA monomer is a model EM231 product of Changxing materials industries, Inc.
In the embodiment, the leveling agent is a BYK-333 type leveling agent; BYK-333 is an organic silicon leveling agent, so that the leveling property of the whole system is better and smoother. The black paste is a paste prepared by grinding high-pigment carbon black, wherein the content (weight) of the carbon black is 10%, and the curing degree of the coating is affected by the content (weight) of the carbon black.
In this embodiment, the uv initiator a is BASF IRGACURE 184 photoinitiator, the uv initiator B is BASF IRGACURE TPO photoinitiator, and the uv initiator C is BASF IRGACURE 907 photoinitiator. The BASF IRGACURE 907 photoinitiator is a free radical type solid photoinitiator, is mainly used together with a mono-functional or multi-functional vinyl monomer and an oligomer for UV curing of unsaturated prepolymers (such as acrylate), and is particularly suitable for a colored UV curing system. In the embodiment, three photoinitiators are used together, so that ultraviolet rays with different wave bands in an ultraviolet region can be absorbed, the UV coating can be cured more completely, and a better surface property is provided for a paint film. In the embodiment, different ultraviolet initiators are adopted for matching the curing problem of a colored paint film, and meanwhile, dual-curing resin (UV resin with hydroxyl) and single-curing UV resin (UV resin without hydroxyl) are adopted for matching the curing problem of different illuminance, so that the product achieves better performance; and in the place that the ultraviolet light is difficult to shine, can effectively compensate polymerization that photoinitiator initiation is few through the reaction of curing agent and the hydroxyl of dual curing resin, guarantee the aridity of here to make the product reach preferred performance.
In the embodiment, the weight part of the tetrafunctional hydroxyl polyurethane acrylic resin is not less than half of the sum of the weight parts of the four-official aliphatic polyurethane acrylic resin, the three-official aliphatic polyurethane acrylic resin and the six-official aliphatic polyurethane acrylic resin; the weight ratio of the three aliphatic polyurethane acrylic resins to the six aliphatic polyurethane acrylic resins is 1: 1-1.5, in the embodiment, the tetra-functional hydroxyl polyurethane acrylic resin is used for providing the adhesive force and the surface leveling property of the matrix, the four aliphatic polyurethane acrylic resins provide the flexibility of the paint film, the six aliphatic polyurethane acrylic resins provide the reaction curing speed and the hardness of the paint film, the black slurry endows the paint film with the color effect, the ultraviolet initiator is used for initiating the polymerization of the monomers and the polyester, the leveling agent provides the leveling property of the paint film, and the ethyl acetate and the butyl acetate are used as solvents to provide the paint with better fluidity and solvent release property; the components are well matched to realize a good and stable curing effect of the coating, so that the one-time coating and color adding are ensured, and the traditional two-time spraying process is improved.
The coating of this example was prepared as follows:
preparing various raw materials, uniformly mixing tetrafunctional hydroxyl polyurethane acrylic resin, four-official aliphatic polyurethane acrylic resin, three-official aliphatic polyurethane acrylic resin, six-official aliphatic polyurethane acrylic resin and TMPTA monomer according to the formula proportion under the condition of keeping out of the sun, stirring for 10-20min under the stirring condition of 600 plus 800 revolutions per minute to obtain a mixture A, wherein the stirring condition is 600 revolutions per minute in the embodiment; stirring for 10 min;
step two, stirring 5-10 parts by weight (specifically 8.5 parts by weight in this embodiment, which is half of the weight of butyl acetate in the formulation), adding 3-9 parts by weight (specifically 5.5 parts by weight in this embodiment) of ultraviolet initiator under the stirring condition of 300 revolutions per minute and 700 revolutions per minute, and uniformly stirring for 10-20min to obtain a mixture B; in the present example, the stirring conditions were 300 rpm, to prevent the initiator having a low viscosity from being thrown away; stirring for 15 min; wherein the first step and the second step have no requirement on the sequence;
step three, adding the mixture B into the mixed mixture A under the stirring condition of 300-700 r/min, adding 0.5-1 part by weight (specifically, 0.5 part by weight in the embodiment) of a leveling agent, and stirring for 10-20min to obtain a mixture C; specifically, in this example, the stirring condition was 300 rpm; stirring for 15 min;
step four, adding 3-5 parts by weight (specifically 3 parts by weight in the embodiment) of black paste into the mixture C under the stirring condition of 300-700 r/min, and uniformly stirring for 10-20 min; obtaining a mixture D; specifically, in this example, the stirring condition was 300 rpm; stirring for 15 min;
step five, adding 5-20 parts by weight (specifically 5 parts by weight in the embodiment) of ethyl acetate and 5-10 parts by weight of butyl acetate (specifically 8.5 parts by weight in the embodiment, namely the other half of the butyl acetate in the formula) into the mixture D under the stirring condition of 300-700 r/min, uniformly stirring and adjusting the viscosity to 20-30S (25 ℃, NK-2), and filtering by adopting a 400-sand 500-mesh filter screen, specifically 300 r/min in the embodiment; the filter screen is 400 meshes, and the weight part of the butyl acetate added in the second step is the same as that of the butyl acetate added in the fifth step.
The preparation is carried out under the condition of keeping out of the sun, so that the action efficiency of the ultraviolet absorbent can be fully improved, and the ultraviolet absorbent is prevented from absorbing ultraviolet light in the preparation process of the coating, so that the quality of the UV coating and the film-forming property of a paint film are influenced by the curing and crosslinking of a preparation system in a semi-finished product state; the ultraviolet initiator must be dissolved by butyl acetate and then added into the reaction system to ensure that the ultraviolet initiator is uniformly dispersed in the system.
The conventional operation of painting the automotive interior part in the industry at present is to brush a layer of black primer and then a layer of high gloss finish paint to present the effect of the high gloss black paint, the embodiment only needs a layer of high gloss black paint, the conventional process means is difficult to overcome the problems of poor curing degree and unstable performance of black UV, and the colored dual-curing UV paint film of the automotive interior part of the embodiment is formed by adopting the paint of the embodiment, integrates the advantages of UV and dual-component PU to achieve the purpose of coating the automotive interior part in a special shape, greatly improves the product performance and appearance decoration, improves the coloring effect of the UV paint of the embodiment by one-time coating, improves the two-time spraying mode of the conventional black primer and the UV paint, thereby saving energy and improving the production efficiency, and the paint film formed by the paint coating of the embodiment can realize complete curing crosslinking without residual solvent and no back adhesion, the coating has good dispersibility, moderate leveling property and moderate thixotropy when being sprayed, so that the coating is uniform, no obvious orange peel exists, no pinhole bubbles exist, no impurity points exist, the paint surface has good leveling property and good glossiness, and the production requirement standard is met; the embodiment effectively utilizes the dual-curing resin to improve the curing effect of the paint film, and simultaneously utilizes the ultraviolet initiators with different wavelengths to respectively initiate the curing of the surface layer, the middle layer and the bottom layer of the paint film, so that the curing effect of the paint film is greatly improved, and the one-coat coloring can be realized.
The paint and the paint film thereof prepared by the formula and the method of the embodiment have good water resistance, and the matching use of the ethyl acetate and the butyl acetate ensures the solubility of all raw materials and improves the drying property of construction.
The crosslinking density of the cured UV coating is greatly higher than that of a hot-baking coating, the performance indexes of the coating in all aspects of hardness, wear resistance, acid and alkali resistance, salt mist resistance, gasoline resistance and other organic solvents are high, particularly the coating is plump, glossy, smooth in surface, high in UV coating curing speed and high in production efficiency, the curing mechanism belongs to a free radical chain reaction, crosslinking and curing are completed instantly, and energy is saved.
The VW TL226 which is popular in the market at present is the most strict standard in the automobile interior trim industry, most automobile interior trim manufacturers equally adopt the VW TL226 standard to detect the performance of paint at present, and the colored dual-curing UV coating for the automobile interior trim provided by the embodiment can completely meet the requirements of the VW TL226 standard through multiple performance tests.
The application method of the preparation method of the colored dual-curing UV coating of the embodiment is as follows:
s1, uniformly mixing and blending the UV coating, the UV coating curing agent and the UV coating diluent according to the weight ratio of 5: 1: 2-3, spraying the mixture on a substrate or a primer layer, leveling and drying at normal temperature for 5-10min, and then keeping the temperature in an environment of 60-80 ℃ for 5-15 min; specifically, in the embodiment, the weight ratio of the UV coating, the UV coating curing agent and the UV coating diluent is 5: 1: 2, the leveling and drying are carried out for 5min at normal temperature, and the drying is carried out for 10min at the temperature of 60 ℃;
s2, carrying out UV curing, wherein the UV exposure energy is 1200-1800MJ/cm2Specifically, in the present embodiment, the UV exposure energy is 1200MJ/cm2。
The UV coating diluent in the embodiment comprises the following raw materials in parts by weight: 40-60 parts of ethyl acetate; 40-60 parts of butyl acetate; the preparation method comprises the following steps: mixing and stirring 40-60 parts by weight of butyl acetate and 40-60 parts by weight of ethyl acetate uniformly for 10-20 minutes; specifically, in this embodiment, the UV paint thinner includes 40 parts of ethyl acetate and 40 parts of butyl acetate, and is prepared by mixing and stirring uniformly for 10 minutes.
The UV coating curing agent in the embodiment comprises the following raw materials in parts by weight: desmodur N339072-78 parts of scientific Polymer (China) Co., Ltd; 22-28 parts of butyl acetate; the preparation method comprises the following steps: mixing 22-28 parts by weight of butyl acetate and 72-78 parts by weight of Desmodur N3390 of Corsai Polymer (China) Co., Ltd, and stirring uniformly for 10-20 minutes; specifically, in the embodiment, the UV coating curing agent comprises Desmodur N339072 parts; 22 parts of butyl acetate, and the preparation method comprises the step of uniformly mixing and stirring for 10 minutes.
The preparation method of the colored dual-curing UV coating can be suitable for beautifying and protecting ABS or PC or ABS + PC base materials, and endows piano black highlight effect on the surface of a paint film.
Example 2
The preparation method of the colored dual-curing UV coating of this embodiment is basically the same as that of embodiment 1, except that the coating in this embodiment comprises the following raw materials in parts by weight:
20 parts of tetra-functional hydroxyl polyurethane acrylic resin;
25.9 parts of four-part aliphatic polyurethane acrylic resin;
wherein the four-part aliphatic polyurethane acrylic resin comprises: 10.9 parts by weight of four-membered aliphatic polyurethane acrylic resin A and 15 parts by weight of four-membered aliphatic polyurethane acrylic resin B;
wherein the ultraviolet initiator comprises 1 part by weight of ultraviolet initiator A, 2 parts by weight of ultraviolet initiator B and 2 parts by weight of ultraviolet initiator C;
the preparation method of the coating is basically the same as that of example 1, except that in the first step of the present example, the stirring condition is 800 rpm, and the stirring time is 15 min; in the other steps, the stirring condition is 700 r/min, the stirring time is 10min, and in the fifth step, a filter screen is used and is 500 meshes; in this embodiment, the black paste is a high pigment carbon black milled paste, wherein the weight content of the carbon black is 8%.
The application method of the preparation method of the colored dual-curing UV coating of the embodiment is as follows:
s1, uniformly mixing and blending the UV coating, the UV coating curing agent and the UV coating diluent according to the weight ratio of 5: 1: 3, spraying the mixture on a substrate or a primer layer, leveling and drying at normal temperature for 10min, and then keeping the mixture at 80 ℃ for 15 min;
s2, carrying out UV curing with UV exposure energy of 1800MJ/cm2。
The UV coating diluent in the embodiment comprises the following raw materials in parts by weight: 60 parts of ethyl acetate; 60 parts of butyl acetate; the preparation method comprises the following steps: and (3) mixing and stirring 60 parts by weight of butyl acetate and 60 parts by weight of ethyl acetate uniformly for 20 minutes.
The UV coating curing agent in the embodiment comprises the following raw materials in parts by weight: desmodur N339078 parts by Corsai Polymer (China) Co., Ltd; 28 parts of butyl acetate; the preparation method comprises the following steps: the preparation method comprises the following steps of mixing and uniformly stirring 28 parts by weight of butyl acetate and 78 parts by weight of Desmodur N3390 of Corsai polymer (China) Co., Ltd for 20 minutes.
Example 3
The preparation method of the colored dual-curing UV coating of this embodiment is basically the same as that of embodiment 1, except that the coating in this embodiment comprises the following raw materials in parts by weight:
25 parts of tetra-functional hydroxyl polyurethane acrylic resin;
20 parts of four-part aliphatic polyurethane acrylic resin;
wherein the four-part aliphatic polyurethane acrylic resin comprises: 12 parts by weight of four-part aliphatic polyurethane acrylic resin A and 8 parts by weight of four-part aliphatic polyurethane acrylic resin B;
wherein the ultraviolet initiator comprises 2 parts by weight of an ultraviolet initiator A, 1.3 parts by weight of an ultraviolet initiator B and 1 part by weight of an ultraviolet initiator C;
the preparation method of the coating is basically the same as that of example 1, except that in the first step of the present example, the stirring condition is 700 rpm, and the stirring time is 12 min; in the other steps, the stirring condition is 700 r/min, the stirring time is 20min, and in the fifth step, a filter screen is 450 meshes; in this embodiment, the black paste is a high pigment carbon black milled paste, wherein the weight content of the carbon black is 5%.
The application method of the preparation method of the colored dual-curing UV coating of the embodiment is as follows:
s1, uniformly mixing and blending the UV coating, the UV coating curing agent and the UV coating diluent according to the weight ratio of 5: 1: 2.5, spraying the mixture on a substrate or a primer layer, leveling and drying at normal temperature for 8min, and then keeping the mixture at 70 ℃ for 10 min;
s2, carrying out UV curing with the UV exposure energy of 1500MJ/cm2。
The UV coating diluent in the embodiment comprises the following raw materials in parts by weight: 50 parts of ethyl acetate; 50 parts of butyl acetate; the preparation method comprises the following steps: and mixing and stirring 50 parts by weight of butyl acetate and 50 parts by weight of ethyl acetate uniformly for 15 minutes.
The UV coating curing agent in the embodiment comprises the following raw materials in parts by weight: desmodur N339075 parts by Corsai Polymer (China) Co., Ltd; 25 parts of butyl acetate; the preparation method comprises the following steps: mixing 25 parts by weight of butyl acetate and 75 parts by weight of Desmodur N3390 of Corsai Polymer (China) Co., Ltd, and stirring uniformly for 15 minutes.
Example 4
The preparation method of the colored dual-curing UV coating of this embodiment is basically the same as that of embodiment 1, except that the coating in this embodiment comprises the following raw materials in parts by weight:
20 parts of tetra-functional hydroxyl polyurethane acrylic resin;
16 parts of four-part aliphatic polyurethane acrylic resin;
wherein the four-part aliphatic polyurethane acrylic resin comprises: 8 parts by weight of four-part aliphatic polyurethane acrylic resin A and 8 parts by weight of four-part aliphatic polyurethane acrylic resin B;
wherein the ultraviolet initiator comprises 1.5 parts by weight of ultraviolet initiator A, 1.2 parts by weight of ultraviolet initiator B and 1.5 parts by weight of ultraviolet initiator C;
in this embodiment, the black paste is a high pigment carbon black milled paste, wherein the weight content of the carbon black is 1%.
Example 5
The preparation method of the colored dual-curing UV coating of this embodiment is basically the same as that of embodiment 1, except that the coating in this embodiment comprises the following raw materials in parts by weight:
25 parts of tetra-functional hydroxyl polyurethane acrylic resin;
16 parts of four-part aliphatic polyurethane acrylic resin;
wherein the four-part aliphatic polyurethane acrylic resin comprises: 8 parts by weight of four-part aliphatic polyurethane acrylic resin A and 8 parts by weight of four-part aliphatic polyurethane acrylic resin B;
wherein the ultraviolet initiator comprises 1 part by weight of ultraviolet initiator A, 1 part by weight of ultraviolet initiator B and 1 part by weight of ultraviolet initiator C;
the following table 1 shows the raw material composition of the coating in the above examples.
Table 1 raw material composition of coating materials of examples
The following table 2 shows the composition of the coating materials for the comparative examples, and the preparation method and the using method thereof are substantially the same as those of the above examples.
Table 2 comparative example coating raw material composition
The coatings obtained in the above examples and comparative examples were used, and the properties of the formed paint films were measured, and the results are shown in Table 3.
TABLE 3 film property test results
The appearance of the paint film in the performance detection is to evaluate whether the formed film has surface flaws such as blistering, orange peel, shrinkage cavity, corrugation, miliaria and the like; the storage period is to evaluate whether the paint has abnormal conditions such as thickening, layering, gumming, discoloring, thickening and the like in the shelf life; the test standards for the properties of the above paint films are referred to the general VW TL226 standard. As can be seen from table 3, the colored dual-curing UV coating for automotive upholsteries prepared in this embodiment can completely meet the standard of VW TL226 of the public.
Example 6
The preparation method of the colored dual-curing UV coating of this embodiment is basically the same as that of embodiment 1, except that the coating in this embodiment comprises the following raw materials in parts by weight:
30 parts of tetra-functional hydroxyl polyurethane acrylic resin;
30 parts of four-part aliphatic polyurethane acrylic resin;
wherein the four-part aliphatic polyurethane acrylic resin comprises: 15 parts by weight of four-membered aliphatic polyurethane acrylic resin A and 15 parts by weight of four-membered aliphatic polyurethane acrylic resin B;
wherein the ultraviolet initiator comprises 3 parts by weight of an ultraviolet initiator A, 3 parts by weight of an ultraviolet initiator B and 3 parts by weight of an ultraviolet initiator C;
example 7
The preparation method of the colored dual-curing UV coating of this embodiment is basically the same as that of embodiment 1, except that the coating in this embodiment comprises the following raw materials in parts by weight:
25 parts of tetra-functional hydroxyl polyurethane acrylic resin;
20 parts of four-part aliphatic polyurethane acrylic resin;
wherein the four-part aliphatic polyurethane acrylic resin comprises: 10 parts by weight of four-part aliphatic polyurethane acrylic resin A and 10 parts by weight of four-part aliphatic polyurethane acrylic resin B;
wherein the ultraviolet initiator comprises 2 parts by weight of an ultraviolet initiator A, 2 parts by weight of an ultraviolet initiator B and 2 parts by weight of an ultraviolet initiator C;
the present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.
Claims (2)
1. A preparation method of a colored dual-curing UV coating is characterized by comprising the following steps:
preparing various raw materials, and uniformly mixing tetra-functional hydroxyl polyurethane acrylic resin, four-official aliphatic polyurethane acrylic resin, three-official aliphatic polyurethane acrylic resin, six-official aliphatic polyurethane acrylic resin and TMPTA monomer under the condition of stirring in a dark place to obtain a mixture A;
stirring part of butyl acetate, adding an ultraviolet light initiator under the stirring condition, and uniformly stirring to obtain a mixture B;
adding the mixture B into the mixed mixture A under the stirring condition, adding the leveling agent, and stirring for 10-20min to obtain a mixture C;
step four, adding the black paste into the mixture C under the stirring condition, and uniformly stirring for 10-20 min; obtaining a mixture D;
step five, adding ethyl acetate and the residual butyl acetate into the mixture D under the stirring condition, uniformly stirring, adjusting the viscosity to 20-30S under the conditions of 25 ℃ and NK-2, and filtering to obtain the product; the weight part of the butyl acetate added in the second step is the same as that of the butyl acetate added in the fifth step; in the first step, the stirring condition is 600-; the stirring condition in the other steps is 300-700 r/min;
the raw materials comprise the following components in parts by weight:
20-30 parts of tetra-functional hydroxyl polyurethane acrylic resin;
16-30 parts of four-part aliphatic polyurethane acrylic resin;
8-12 parts of three-part aliphatic polyurethane acrylic resin;
10-15 parts of six-membered aliphatic polyurethane acrylic resin;
10-15 parts of TMPTA monomer;
3-9 parts of an ultraviolet initiator;
0.5-1 part of a leveling agent;
3-5 parts of black paste;
5-20 parts of ethyl acetate;
10-20 parts of butyl acetate;
six-membered aliphatic polyurethane acrylic resin is a polyurethane acrylic oligomer; the three-part aliphatic polyurethane acrylic resin and the four-part aliphatic polyurethane acrylic resin are aliphatic polyurethane acrylate oligomers; the tetrafunctional hydroxyl polyurethane acrylic resin is a polyurethane acrylic oligomer containing hydroxyl; the TMPTA monomer is a trifunctional acrylic oligomer; the black paste is a paste prepared by grinding high-pigment carbon black, wherein the weight content of the carbon black is not higher than 10 percent;
the four-part aliphatic polyurethane acrylic resin comprises the following raw materials in parts by weight:
8-15 parts of four-part aliphatic polyurethane acrylic resin A;
8-15 parts of four-part aliphatic polyurethane acrylic resin B;
wherein the four-part aliphatic polyurethane acrylic resin A is CN8000 of Shadoma Guangzhou chemical company, and the four-part aliphatic polyurethane acrylic resin B is CN8007 of Shadoma Guangzhou chemical company;
the weight part of the tetrafunctional hydroxyl polyurethane acrylic resin is not less than half of the sum of the weight parts of the four-official aliphatic polyurethane acrylic resin, the three-official aliphatic polyurethane acrylic resin and the six-official aliphatic polyurethane acrylic resin; and the weight ratio of the three-part aliphatic polyurethane acrylic resin to the six-part aliphatic polyurethane acrylic resin is 1: (1-1.5);
the ultraviolet initiator comprises the following raw materials in parts by mass:
1841-3 parts of an ultraviolet initiator;
1-3 parts of ultraviolet initiator TPO;
and 9071-3 parts of an ultraviolet initiator.
2. The method for preparing a colored dual cure UV coating according to claim 1, characterized in that: the leveling agent is a BYK-333 type leveling agent.
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| CN109880517A (en) * | 2019-03-12 | 2019-06-14 | 浙江纳美新材料股份有限公司 | A kind of dedicated UV mill base of woodenware |
| CN110982419A (en) * | 2019-12-25 | 2020-04-10 | 清远雅克化工有限公司 | Special high-performance dual-curing UV (ultraviolet) coating for automotive upholstery and preparation method thereof |
| CN114806393A (en) * | 2022-05-27 | 2022-07-29 | 湖南宏泰新材料有限公司 | One-coating color-adding high-gloss UV (ultraviolet) curing coating for automotive interior and preparation method thereof |
| CN116082944B (en) * | 2023-02-23 | 2024-03-12 | 芜湖春风新材料有限公司 | Dual UV (ultraviolet) curing coating with ultrahigh boiling resistance, and preparation method and application thereof |
| CN117363202B (en) * | 2023-10-27 | 2024-04-12 | 浙江圣力邦漆业有限公司 | Preparation method and device of dual-curing UV piano black paint |
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| CN102746785A (en) * | 2011-04-19 | 2012-10-24 | 比亚迪股份有限公司 | Dual-cured coating composition and curing method thereof |
| CN102827501A (en) * | 2012-08-02 | 2012-12-19 | 中山大桥化工企业集团中山智亨实业发展有限公司 | Double-curing varnish paint |
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| CN106366901A (en) * | 2016-08-27 | 2017-02-01 | 彩城（惠州）化工有限公司 | Doubly solidified coloring UV nanometer paint |
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| CN102746785A (en) * | 2011-04-19 | 2012-10-24 | 比亚迪股份有限公司 | Dual-cured coating composition and curing method thereof |
| CN102827501A (en) * | 2012-08-02 | 2012-12-19 | 中山大桥化工企业集团中山智亨实业发展有限公司 | Double-curing varnish paint |
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