CN110951341A - Automobile finish composite coating capable of being rapidly cured and long in activation period and preparation method thereof - Google Patents
Automobile finish composite coating capable of being rapidly cured and long in activation period and preparation method thereof Download PDFInfo
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- CN110951341A CN110951341A CN201911161264.4A CN201911161264A CN110951341A CN 110951341 A CN110951341 A CN 110951341A CN 201911161264 A CN201911161264 A CN 201911161264A CN 110951341 A CN110951341 A CN 110951341A
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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
- 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
- B05D3/12—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 mechanical means
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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
- B05D7/50—Multilayers
- B05D7/56—Three layers or more
- B05D7/57—Three layers or more the last layer being a clear coat
- B05D7/576—Three layers or more the last layer being a clear coat each layer being cured, at least partially, separately
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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
- C09D201/00—Coating compositions based on unspecified macromolecular compounds
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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
- B05D2451/00—Type of carrier, type of coating (Multilayers)
-
- 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
- B05D2502/00—Acrylic polymers
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention discloses an automobile finish composite coating capable of being rapidly cured and long in activation period, which is a three-layer automobile finish composite coating, wherein: the first layer is a 1k base color paint layer which is sprayed and does not have chemical crosslinking reaction, the second layer is a 1k transparent accelerating paint layer which is sprayed and does not have chemical crosslinking reaction and contains a drier, and the third layer is a 2k finishing varnish layer; the 1k transparent accelerating paint layer in the three-layer automobile finish composite coating migrates the drier in the 2k finishing varnish coating and accelerates the rapid curing of the 2k finishing varnish coating; the composite coating can be cured and polished after being dried for 1 hour at normal temperature, the activation period of the 2k finishing varnish is not less than 6 hours, and the composite coating can be surface-dried and dried at normal temperature without being baked. The invention also provides a preparation method thereof, and aims to improve the surface drying and actual drying curing speed of the 2k finishing varnish layer and prolong the activation period of the 2k finishing varnish layer by synchronously improving the coating components and the preparation process.
Description
Technical Field
The invention relates to the technical field of automobile coatings, in particular to an automobile finish composite coating capable of being cured quickly and long in activation period and a preparation method thereof.
Background
Along with the annual increase of automobile sales volume in China, the using amount of automobile repair coating is larger and larger, the automobile color is richer and richer, and the automobile color is provided by automobile finish. Automotive topcoats are classified into two types. The 2k solid color paint is prepared with hydroxy acrylic resin or polyester resin or their mixture as main material, pigment, solvent, assistant and other material to form component A, polyisocyanate as component B, and through mixing component A and component B in certain proportion, stirring, regulating with diluent to reach spraying viscosity and spraying. The other is a composite coating of 1K base paint and 2K finishing varnish. The 1k base paint is prepared from low hydroxyl value acrylic resin and cellulose acetate butyrate as main materials, and various pigment solvent additives, wherein a diluent is used for preparing the spraying viscosity during construction, the spraying construction is carried out, a main film forming substance of the 1k base paint has higher glass transition temperature, the physical drying is realized, the drying is rapid, and the 1k base paint has poor water resistance and oil resistance and low gloss because no chemical crosslinking reaction is generated, so that the upper layer of the 1k base paint needs to be sprayed with 2k of finishing varnish for protection and decoration. The 2k finishing varnish is composed of a component A and a component B, wherein the component A is composed of hydroxy acrylic resin or polyester resin or a mixture of the hydroxy acrylic resin and the polyester resin, various solvent assistants and other materials, and the component B is a polyisocyanate curing agent. During construction, the component A and the component B are mixed and stirred uniformly according to a certain proportion, a diluent is used for preparing spraying viscosity, the spraying viscosity is generally 16-18 seconds, spraying construction is carried out, and after construction, hydroxyl (-OH) of the component A and isocyanate (-NCO) of the component B are crosslinked and cured at normal temperature to form a hard and bright coating film which has long-term color and gloss retention, good weather resistance and good solvent resistance.
At present, the automobile repair industry develops towards 'quick repair' and 'energy saving', and the coating can be dried quickly without baking, so that energy and working hours can be saved, and the automobile delivery efficiency is improved. In the composite coating of 1K base color paint and 2K finishing varnish, the 1K base color paint belongs to physical drying, no chemical crosslinking reaction exists, the drying speed is high, the 2K finishing varnish needs a chemical crosslinking reaction of-OH and-NCO, the drying speed is low, particularly in winter, the coating film cannot reach the hardness required by polishing in time after construction due to low temperature, and the traffic delay is caused, so that the problem which needs to be solved at present is very difficult. The conventional solution is to add a drier to the 2k overprint varnish or to heat the coating film or to do both, which can effectively promote the chemical crosslinking reaction and increase the drying speed, but also brings some disadvantages when the drying speed is increased. For example, the coating film is heated, electric energy is consumed, and the cost is increased; the addition of the drier in the 2k finishing varnish can lead to the accelerated reaction of the varnish A component and the varnish B component after mixing, the molecular weight rise, the viscosity rise and the construction time to be greatly shortened, namely the activation period is short. The mixed liquid in the construction state after mixing must be used up in a short time, otherwise the viscosity of the whole mixed liquid rises, a great amount of orange peel is generated during spraying, or the phenomenon of filament drawing is generated, a complete coating cannot be formed, and finally the viscosity rises and is solidified into a colloid, so that the requirements of the spraying construction time and the spraying process of the whole vehicle cannot be met.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the automobile finish composite coating which can be quickly cured and has long activation period and the preparation method thereof, and by synchronously improving the coating components and the preparation process, the surface drying curing speed of the 2k finishing varnish can be improved, and the activation period of the 2k finishing varnish can be prolonged, so that the requirements of the spraying construction time and the process of the whole automobile can be met.
In order to achieve the purpose, the invention provides the following technical scheme:
the automobile finish composite coating capable of being rapidly cured and long in activation period is characterized by being a three-layer automobile finish composite coating consisting of three paint coatings formed by spraying from bottom to top in sequence, wherein: the first layer is a 1k base color paint layer which is sprayed and does not have chemical crosslinking reaction, the second layer is a 1k transparent accelerating paint layer which is sprayed and does not have chemical crosslinking reaction and contains 0.5-1 wt% of drier, and the third layer is a 2k finishing varnish layer which is sprayed and does not contain drier and has chemical crosslinking reaction; the 1k transparent accelerating paint layer in the three-layer automobile finish composite coating migrates the drier in the 2k finishing varnish coating and accelerates the rapid curing of the 2k finishing varnish coating; the composite coating can be cured and polished after being dried for 1 hour at normal temperature, wherein the activation period of the used 2k finishing varnish is not less than 6 hours, and the composite coating can be surface-dried and dried at normal temperature without being baked.
The 1K transparent promoting coating is prepared from 20-35 wt% of main resin, 20-30 wt% of auxiliary resin, 25-55 wt% of solvent, 0.5-1 wt% of drier and 4-10 wt% of auxiliary agent.
Wherein the coating main body resin is QINGYUANYAKE chemical YZ-H304 resin;
wherein the auxiliary resin is 20 wt% CAB-381-2 or 20 wt% CAB-381-0.5; wherein the 20 wt% CAB-381-2 is prepared by dissolving 20 parts of Istman chemical CAB-381-2 with 80 parts of butyl acetate into a solution with the concentration of 20 wt%; 20 wt% CAB-381-0.5 is prepared by dissolving 20 parts of Istmann chemical CAB-381-0.5 with 80 parts of butyl acetate to obtain a solution with 20 wt% concentration.
Wherein the drier is T-12 of the United states gas chemical industry.
Wherein the solvent is one or more of butyl acetate, 3-ethoxy ethyl propionate, methyl isobutyl ketone and propylene glycol methyl ether acetate.
Wherein the auxiliary agent is wetting agent, flatting agent and dehydrating agent.
The preparation method of the automobile finish composite coating capable of being rapidly cured and long in activation period is characterized by comprising the following steps of:
a. firstly, spraying 1k of base color paint without chemical crosslinking reaction, and drying the surface for 5-10 minutes to form a 1k of base color paint layer;
b. spraying 1k of transparent accelerating coating which does not have chemical crosslinking reaction and contains 0.5-1 wt% of drier, and drying the surface for 2-5 minutes to form a 1k of transparent accelerating coating layer;
c. spraying a 2k overprint varnish containing no drier and having a chemical crosslinking reaction to form a 2k overprint varnish coating, wherein the 2k overprint varnish has an activation period of not less than 6 hours.
d. And (5) carrying out polishing operation after curing and drying for 1 hour at normal temperature.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the composite coating and the preparation method thereof, after the spraying construction is finished, the 1k transparent accelerating agent in the coating migrates to the 2k finishing varnish coating, so that the quick curing of the finishing varnish is accelerated, the surface and actual drying and curing speed of the 2k finishing varnish can be greatly improved, and the polishing operation can be carried out after the coating is dried for 1 hour at normal temperature; meanwhile, the activation period of the 2k finishing varnish can be prolonged, so that the activation period can reach not less than 6 hours, and the requirements of the spraying construction time and the process of the whole vehicle can be met.
2. The preparation method provided by the invention can improve the drying speed of the 2k finishing varnish, ensure that polishing operation can be carried out after drying for 1 hour, prolong the activation period of the 2k finishing varnish to 6 hours, meet the time requirements of spraying and quick repair of the whole vehicle and improve the fullness of the composite coating.
3. The composite coating and the preparation method thereof provided by the invention do not need to transform or add equipment, do not need extra operation training of operators, and have wide applicability.
4. The composite coating and the preparation method thereof provided by the invention do not need baking in the construction process and the drying process, can finish the curing, surface drying and actual drying processes at normal temperature, and can effectively simplify the process and save energy.
Detailed Description
The present invention is described in detail below with reference to embodiments of the present invention, and all other embodiments obtained by those skilled in the art without any inventive step are within the scope of the present invention.
Example 1:
the automobile finish composite coating capable of being rapidly cured and long in activation period provided by the embodiment is an automobile finish composite coating consisting of three paint coatings formed by sequentially spraying from bottom to top, wherein: the first layer is a 1k base color paint layer which is sprayed and does not have chemical crosslinking reaction, the second layer is a 1k transparent accelerating paint layer which is sprayed and does not have chemical crosslinking reaction and contains 0.5-1 wt% of drier, and the third layer is a 2k finishing varnish layer which is sprayed and does not contain drier and has chemical crosslinking reaction; the 1k transparent accelerating paint layer in the three-layer automobile finish composite coating migrates the drier in the 2k finishing varnish coating and accelerates the rapid curing of the 2k finishing varnish coating; the composite coating can be cured and polished after being dried for 1 hour at normal temperature, wherein the activation period of the used 2k finishing varnish is not less than 6 hours, and the composite coating can be surface-dried and dried at normal temperature without being baked.
The 1K transparent promoting coating is prepared from 20-35 wt% of main resin, 20-30 wt% of auxiliary resin, 25-55 wt% of solvent, 0.5-1 wt% of drier and 4-10 wt% of auxiliary agent.
In this embodiment, the 1K transparent accelerating paint is specifically prepared from 35 wt% of main resin, 29 wt% of auxiliary resin, 25 wt% of solvent, 1 wt% of drier and 10 wt% of auxiliary agent
Wherein the coating main body resin is QINGYUANYAKE chemical YZ-H304 resin;
the commercially available YZ-H304 resin of qingyuan gaka chemical ltd adopted in this example is a 1K resin containing an acrylic resin as a main component, and has good color rendering property, good compatibility, clarity, transparency, and good storage stability.
Wherein the auxiliary resin is 20 wt% CAB-381-2 or 20 wt% CAB-381-0.5; wherein the 20 wt% CAB-381-2 is prepared by dissolving 20 parts of Istman chemical CAB-381-2 with 80 parts of butyl acetate into a solution with the concentration of 20 wt%; 20 wt% CAB-381-0.5 is prepared by dissolving 20 parts of Istmann chemical CAB-381-0.5 with 80 parts of butyl acetate to obtain a solution with 20 wt% concentration.
Wherein the drier is T-12 of the United states gas chemical industry.
Wherein the solvent is one or more of butyl acetate, 3-ethoxy ethyl propionate, methyl isobutyl ketone and propylene glycol methyl ether acetate.
Wherein the auxiliary agent is wetting agent, flatting agent and dehydrating agent.
The preparation method of the automobile finish composite coating capable of being rapidly cured and long in activation period comprises the following steps:
a. firstly, spraying 1k of base color paint without chemical crosslinking reaction, and drying the surface for 5-10 minutes to form a 1k of base color paint layer;
b. spraying 1k of transparent accelerating coating which does not have chemical crosslinking reaction and contains 1 wt% of drier, and drying the surface for 2-5 minutes to form a 1k of transparent accelerating coating layer;
c. spraying a 2k overprint varnish containing no drier and having a chemical crosslinking reaction to form a 2k overprint varnish coating, wherein the 2k overprint varnish has an activation period of not less than 6 hours.
d. And (5) carrying out polishing operation after curing and drying for 1 hour at normal temperature.
The composite coating and the preparation method thereof provided by the embodiment of the invention can improve the surface and actual curing and drying speed of the 2k finishing varnish and can prolong the activation period of the 2k finishing varnish. After the construction is completed, the 1k clear promotion paint promotes the migration of the drier into the 2k overprint varnish coating and promotes the rapid curing of the overprint varnish. The method can greatly improve the drying speed of the 2k finishing varnish, can ensure that polishing operation can be carried out after drying for 1 hour, and can prolong the activation period of the 2k finishing varnish to reach more than 6 hours.
The technical scheme of this patent and other construction method contrast tests:
and constructing by adopting four methods at the temperature of 5-35 ℃ and the humidity of 25-75% RH.
The method A comprises the following steps: spraying 1k of base paint without chemical crosslinking reaction, drying the surface for 5-10 minutes, and spraying 2k of finishing varnish without drier and with chemical crosslinking reaction;
the method B comprises the following steps: spraying 1k of base paint without chemical crosslinking reaction, drying the surface for 5-10 minutes, and spraying 2k of finishing varnish containing 1 wt% of drier and having chemical crosslinking reaction;
method C (i.e. invention): spraying 1k base paint without chemical crosslinking reaction, drying for 5-10 minutes, spraying 1k transparent accelerating paint without chemical crosslinking reaction and containing 1 wt% of drier, drying for 2-5 minutes, and spraying 2k finishing varnish without chemical crosslinking reaction and containing no drier.
Spraying 1k of base paint without chemical crosslinking reaction, drying the surface for 5-10 minutes, and spraying 2k of finishing varnish containing 0.1 wt% of drier and having chemical crosslinking reaction;
after the construction, the 2k overprint varnishes used in each process with chemical crosslinking reaction were tested for the pot life with the following results:
in the four methods, the activation period time difference of the 2k finishing varnish is obvious, wherein the activation period of the 2k finishing varnish of the method B is too short, the varnish reacts too fast with polyisocyanate curing agent after being mixed, the heating phenomenon occurs, the viscosity of the mixed solution rises obviously, the activation period cannot be tested, the requirement of local repair or finished automobile spraying construction time cannot be met at all, and the activation period of the method D can only be used for local small-area repair of automobiles and cannot be used for finished automobile spraying. The pot life of method a and method C is excellent.
The dry film thickness of the composite coating of the automobile finish by the four methods and the time for reaching the polishing hardness HB are tested, and the results are shown in the following table:
in the four methods, the time difference of the automobile finish composite coating reaching the polishable hardness HB is obvious, wherein the A, D method has too long time, the polishing operation can be carried out only overnight after spraying, the requirement of 'quick repair' cannot be met, the activation period of the 2k finishing varnish in the method B is too short, the reaction of the varnish after mixing with the polyisocyanate curing agent is too fast, the heating phenomenon occurs, the viscosity of the mixed solution obviously rises, the formed coating is soft after spraying, the hardness cannot reach HB, and the gloss is poor. The method C has the advantages that the dry film thickness of the composite coating is optimal, the fullness of the coating is good, and meanwhile, the time for reaching the polishing hardness HB only needs 1 hour, so that the requirement of 'quick repair' can be completely met.
Example 2:
the automobile finish composite coating which can be rapidly cured and has a long activation period and the preparation method thereof provided by the embodiment are basically the same as the embodiment 1, and the difference is that:
the 1K transparent promoting paint is prepared from 20 wt% of main resin, 20.4 wt% of auxiliary resin, 55 wt% of solvent, 0.6 wt% of drier and 4 wt% of auxiliary agent.
Wherein the solvent is butyl acetate.
Construction is carried out by four methods at a temperature of 8 ℃ and a humidity of 50% RH.
The method A comprises the following steps: spraying 1k of base paint without chemical crosslinking reaction, drying the surface for 10 minutes, and spraying 2k of finishing varnish without drier and with chemical crosslinking reaction;
the method B comprises the following steps: spraying 1k of base paint without chemical crosslinking reaction, drying the surface for 10 minutes, and spraying 2k of finishing varnish containing 0.6 wt% of drier and having chemical crosslinking reaction;
method C (i.e. invention): spraying 1k base coat without chemical crosslinking reaction, drying for 10 minutes, spraying 1k transparent accelerating coating without chemical crosslinking reaction and containing 0.6 wt% of drier, drying for 2 minutes, and spraying 2k finishing varnish without chemical crosslinking reaction and containing no drier.
Spraying 1k base color paint without chemical crosslinking reaction, drying the surface for 10 minutes, and spraying 2k finishing varnish containing 0.06 wt% of drier and having chemical crosslinking reaction;
after the construction was completed, the 2k overprint varnish having a chemical crosslinking reaction used in each method was subjected to an activation period test, and the results were as follows:
the thickness of the dry film of the composite coating of the automobile finish by the four methods and the time for reaching the polishing hardness HB are tracked, and the results are as follows:
example 3:
the automobile finish composite coating capable of being rapidly cured and long in activation period and the preparation method thereof provided by the embodiment are basically the same as those in the embodiments 1 and 2, and the difference is that:
the 1K transparent promoting paint is prepared from 25 wt% of main resin, 20 wt% of auxiliary resin, 47 wt% of solvent, 0.5 wt% of drier and 7.5 wt% of auxiliary agent.
Wherein the solvent is a mixture of 3-ethoxy ethyl propionate and methyl isobutyl ketone, and is prepared according to the weight percent of each 50 percent.
Construction was carried out by four methods at a temperature of 25 ℃ and a humidity of 40% RH.
The method A comprises the following steps: spraying 1k of base paint without chemical crosslinking reaction, drying the surface for 5 minutes, and spraying 2k of finishing varnish without drier and with chemical crosslinking reaction;
the method B comprises the following steps: spraying 1k of base paint without chemical crosslinking reaction, drying the surface for 5 minutes, and spraying 2k of finishing varnish containing 1% of drier and having chemical crosslinking reaction;
method C (i.e. invention): spraying 1k base coat without chemical crosslinking reaction, drying for 5 minutes, spraying 1k transparent accelerating coating without chemical crosslinking reaction and containing 0.5 wt% of drier, drying for 5 minutes, and spraying 2k finishing varnish without chemical crosslinking reaction and containing no drier.
Spraying 1k base color paint without chemical crosslinking reaction, drying the surface for 10 minutes, and spraying 2k finishing varnish containing 0.05 wt% of drier and having chemical crosslinking reaction;
after the construction was completed, the 2k overprint varnish having a chemical crosslinking reaction used in each method was subjected to an activation period test, and the results were as follows:
the thickness of the dry film of the composite coating of the automobile finish by the four methods and the time for reaching the polishing hardness HB are tracked, and the results are as follows:
| test method | Dry film thickness (micrometer) of composite coating | Time to reach polishable hardness HB |
| Method A | 67.6 | 36 hours |
| Method B | 65.6 | Fail to test |
| Method C | 76.4 | 50 minutes |
| Method D | 65.9 | 22 hours |
Example 4:
the automobile finish composite coating capable of being rapidly cured and long in activation period and the preparation method thereof provided by the embodiment are basically the same as those of the embodiments 1, 2 and 3, and the difference is that:
the 1K transparent promoting paint is prepared from 30 wt% of main resin, 30 wt% of auxiliary resin, 31 wt% of solvent, 0.8 wt% of drier and 8.2 wt% of auxiliary agent.
The solvent is a mixture of butyl acetate and propylene glycol methyl ether acetate, and is prepared according to the mass ratio of 2: 1.
The composite coating and the preparation method thereof provided by the embodiment of the invention mainly achieve the purposes of improving the surface curing speed of the 2k finishing varnish, namely improving the surface curing and drying speed of the 2k finishing varnish and prolonging the activation period of the 2k finishing varnish by synchronously improving the coating components and the preparation process. After the construction is completed, the 1k clear promotion paint promotes the migration of the drier into the 2k overprint varnish coating and promotes the rapid curing of the overprint varnish. The method can greatly improve the drying speed of the 2k finishing varnish, can ensure that polishing operation can be carried out after drying for 1 hour, and can prolong the activation period of the 2k finishing varnish to reach more than 6 hours.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. The automobile finish composite coating capable of being rapidly cured and long in activation period is characterized by being a three-layer automobile finish composite coating consisting of three paint coatings formed by spraying from bottom to top in sequence, wherein: the first layer is a 1k base color paint layer which is sprayed and does not have chemical crosslinking reaction, the second layer is a 1k transparent accelerating paint layer which is sprayed and does not have chemical crosslinking reaction and contains 0.5-1 wt% of drier, and the third layer is a 2k finishing varnish layer which is sprayed and does not contain drier and has chemical crosslinking reaction; the 1k transparent accelerating paint layer in the three-layer automobile finish composite coating migrates the drier in the 2k finishing varnish coating and accelerates the rapid curing of the 2k finishing varnish coating; the composite coating can be cured and polished after being dried for 1 hour at normal temperature, wherein the activation period of the used 2k finishing varnish is not less than 6 hours, and the composite coating can be surface-dried and dried at normal temperature without being baked.
2. The automobile finish composite coating capable of being rapidly cured and long in activation period according to claim 1, wherein the 1K transparent accelerating paint is prepared from 20-35 wt% of main resin, 20-30 wt% of auxiliary resin, 25-55 wt% of solvent, 0.5-1 wt% of drier and 4-10 wt% of auxiliary agent.
3. The automotive topcoat composite coating layer capable of being rapidly cured and having a long activation period according to claim 2, wherein the coating main body resin is a Qingyuan Jack chemical YZ-H304 resin.
4. The fast curable long-lived automotive topcoat composite coating of claim 2, wherein the auxiliary resin is 20 wt% CAB-381-2 or 20 wt% CAB-381-0.5; wherein the 20 wt% CAB-381-2 is prepared by dissolving 20 parts of Istman chemical CAB-381-2 with 80 parts of butyl acetate into a solution with the concentration of 20 wt%; 20 wt% CAB-381-0.5 is prepared by dissolving 20 parts of Istmann chemical CAB-381-0.5 with 80 parts of butyl acetate to obtain a solution with 20 wt% concentration.
5. The rapidly curable long-lived automotive topcoat composite coating of claim 2, wherein the drier is U.S. gas chemical T-12.
6. The automotive topcoat composite coating layer capable of being rapidly cured and having a long activation period as claimed in claim 2, wherein the solvent is one or more of butyl acetate, ethyl 3-ethoxypropionate, methyl isobutyl ketone and propylene glycol methyl ether acetate.
7. The automotive topcoat composite coating which can be rapidly cured and has a long activation period as claimed in claim 2, wherein the auxiliary agent is a wetting agent, a leveling agent or a dehydrating agent.
8. The preparation method of the automobile finish composite coating capable of being rapidly cured and long in activation period according to claims 1-7, characterized by comprising the following steps:
a. firstly, spraying 1k of base color paint without chemical crosslinking reaction, and drying the surface for 5-10 minutes to form a 1k of base color paint layer;
b. spraying 1k of transparent accelerating coating which does not have chemical crosslinking reaction and contains 0.5-1 wt% of drier, and drying the surface for 2-5 minutes to form a 1k of transparent accelerating coating layer;
c. spraying a 2k overprint varnish containing no drier and having a chemical crosslinking reaction to form a 2k overprint varnish coating, wherein the 2k overprint varnish has an activation period of not less than 6 hours.
9. The method for preparing the automobile finishing coat composite coating with the advantages of rapid curing and long activation period according to claim 8, characterized by further comprising the following steps:
d. and (5) carrying out polishing operation after curing and drying for 1 hour at normal temperature.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911161264.4A CN110951341A (en) | 2019-11-24 | 2019-11-24 | Automobile finish composite coating capable of being rapidly cured and long in activation period and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911161264.4A CN110951341A (en) | 2019-11-24 | 2019-11-24 | Automobile finish composite coating capable of being rapidly cured and long in activation period and preparation method thereof |
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| CN110951341A true CN110951341A (en) | 2020-04-03 |
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|---|---|---|---|
| CN201911161264.4A Withdrawn CN110951341A (en) | 2019-11-24 | 2019-11-24 | Automobile finish composite coating capable of being rapidly cured and long in activation period and preparation method thereof |
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| CN (1) | CN110951341A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112495740A (en) * | 2020-11-18 | 2021-03-16 | 奇瑞汽车股份有限公司 | High-color-fixation paint and 2K varnish coating environment-friendly process |
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2019
- 2019-11-24 CN CN201911161264.4A patent/CN110951341A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112495740A (en) * | 2020-11-18 | 2021-03-16 | 奇瑞汽车股份有限公司 | High-color-fixation paint and 2K varnish coating environment-friendly process |
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