CN110964393B - Varnish composition with anti-indentation self-repairing function of protective film and preparation method and application thereof - Google Patents
Varnish composition with anti-indentation self-repairing function of protective film and preparation method and application thereof Download PDFInfo
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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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- 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
- C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
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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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- 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/63—Additives non-macromolecular organic
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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
- 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 varnish composition with a function of resisting the indentation self-repairing of a protective film, which at least comprises the following components: a carboxylic acid-modified acrylic resin containing a carboxyl group and an ester group; epoxy modified acrylic resin; a hydroxy polyester resin; and a melamine based crosslinking agent. The technical scheme not only solves the customer complaints of on-site film pasting indentation, but also improves the hardness of the whole paint film and the appearance of the paint film on the surface, so that the whole varnish is more suitable for industrial application. The invention also discloses a preparation method and application of the varnish composition.
Description
Technical Field
The invention relates to the technical field of coatings. More particularly, relates to a varnish composition with a function of resisting the indentation self-repairing of a protective film, and a preparation method and application thereof.
Background
At present, each large company has own varnish technology, and commercial varnish systems are roughly divided into the following three types:
1K aminoacrylic acid system: the system has excellent comprehensive performance, basically meets the appearance, construction and dry film performance of various automobile manufacturers, and has lower cost, so that various automobile paint companies basically have the technology, the basic difference of various comprehensive performances is not large, and the system is basically the same and different in formula.
2K polyurethane system: due to the high-quality appearance and excellent construction performance of the 2K system, European and American countries are promoted at present, corresponding technologies are mature, more than ten years of commercial experience exists at present, but the corresponding cost is high, and the construction process is also more complicated corresponding to 1K. In addition, the green market is promoted in China at present, and compared with the 1K amino acrylic acid system, the system has absolute advantage in the aspect of VOC, so that the system is still the system mainly promoted in the China market at present.
1K acid epoxy system: compared with the varnishes of the first two systems, the advantages and the disadvantages of the system are relatively obvious, and the advantages and the disadvantages are as follows:
the advantages are that:
1. under the condition of lower spraying film thickness, the appearance with high fullness can be achieved;
2. compared with a 2K polyurethane system, the cost is lower;
3. good acid and corrosion resistance, as shown in the following formula, the C-O-bond formed by the reaction of the epoxy group and the carboxylic acid group has excellent acid and alkali resistance
The disadvantages are as follows:
1. the paint film is softer and the crosslinking density is lower compared with the aminoacrylic system.
2. The space improvement is small, compared with an amino acrylic acid system, the improvement method of certain properties is single, and fewer industrial products can be used for improvement.
3. The stability is poor, and is somewhat less than that of the 1K amino acrylic system.
Because of the above disadvantages, the varnish of the system is hardly promoted in the countries of europe and america, but the countries of japan and korea prefer the varnish, so that the 1K acid epoxy system has a certain market share.
Therefore, it is desirable to provide a novel 1K acid epoxy coating composition to overcome the above-mentioned disadvantages of the prior 1K acid epoxy coating.
Disclosure of Invention
The first purpose of the invention is to provide a varnish composition with a function of preventing the self-repairing of the indentation of the protective film, which belongs to a varnish composition of a 1K acid epoxy system, and the varnish composition not only has the advantages of the prior varnish of the 1K acid epoxy system, but also has high hardness, good appearance, good stability and good indentation resistance and indentation self-repairing performance.
The second purpose of the invention is to provide a preparation method of the varnish composition with the function of resisting the self-repairing of the protective film indentation.
The third purpose of the invention is to provide a varnish with the function of resisting the self-repairing of the protective film indentation.
The fourth purpose of the invention is to provide the application of the varnish with the function of resisting the self-repairing of the protective film indentation in the automobile coating.
In order to achieve the first purpose, the invention adopts the following technical scheme:
a varnish composition having a function of resisting protective film indentation self-repair, the varnish composition comprising at least:
a carboxylic acid-modified acrylic resin containing a carboxyl group and an ester group;
epoxy modified acrylic resin;
a hydroxy polyester resin; and
a melamine based cross-linking agent.
Further, the melamine-based crosslinking agent is a trialkoxycarbonylaminotriazine crosslinking agent.
Further, the varnish composition contains 3 to 5 parts by mass of a melamine-based crosslinking agent.
Further, the acid value of the carboxylic acid modified acrylic resin is 57-67mgKOH/g, the number average molecular weight is 1500-3500, and the weight average molecular weight is 2500-3500.
Further, the varnish composition contains 25 to 30 parts by mass of a carboxylic acid-modified acrylic resin.
Further, the epoxy equivalent of the epoxy modified acrylic resin is 350-450, the number average molecular weight is 2500-3000, and the weight average molecular weight is 5000-6000.
Further, the varnish composition comprises 32-37 parts by mass of epoxy modified acrylic resin.
Further, the hydroxyl value of the hydroxyl polyester resin is 480mg KOH/g, the number average molecular weight is 2400-2600, and the weight average molecular weight is 3000-3300.
Further, the varnish composition comprises 6-12 parts by mass of a hydroxyl polyester resin.
Further, the varnish composition also comprises a solvent.
Further, the varnish composition comprises 20-30 parts of solvent by mass.
Further, the solvent is selected from one or more of DBE, S-150 solvent oil, S-100 solvent oil, EEP, methanol, ethanol, n-butanol, butyl acetate and BDG.
Furthermore, the varnish composition also comprises an auxiliary agent.
Further, the auxiliary agent is selected from one or more of a resin anchoring agent, a catalyst, a light stabilizer, a leveling agent and a defoaming agent.
Further, the light stabilizer is selected from one or more of HALS auxiliary agent and UV auxiliary agent.
Further, the varnish composition comprises the following components in parts by mass
In order to achieve the second purpose, the invention adopts the following technical scheme:
a preparation method of a varnish composition with a function of resisting protective film indentation self-repairing comprises the following steps:
and uniformly mixing the components, and adjusting the viscosity to obtain the varnish composition.
The varnish has the function of resisting the indentation self-repair of the protective film for achieving the third purpose.
Further, the varnish was prepared from the varnish composition described above for the first object.
In order to achieve the fourth object, the invention provides an application of the varnish in automobile coating, wherein the varnish is used as a finishing coat.
The invention has the following beneficial effects:
the varnish composition provided by the invention is a 1K acid epoxy system, has high appearance fullness, good acid corrosion resistance, high hardness and indentation self-repairing performance, and well solves the problem that the existing 1K acid epoxy system cannot give consideration to both high hardness and indentation resistance of a film.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below in connection with preferred embodiments. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
One embodiment of the present invention provides a varnish composition having a function of resisting protective film indentation self-repair, the varnish composition comprising at least:
a carboxylic acid-modified acrylic resin containing a carboxyl group and an ester group;
epoxy modified acrylic resin;
a hydroxy polyester resin; and
a melamine based cross-linking agent.
In the present embodiment, the varnish composition is a one-component acid epoxy system. The melamine-based crosslinking agent and the hydroxyl polyester resin are combined and used in the varnish composition, a 1K acid epoxy system paint film prepared from the composition has the effects of preventing the indentation of a protective film, higher hardness, good appearance and the like, and the problems that the existing 1K acid epoxy system paint film is softer, the improved space is small, the stability is poor, the hardness is low, the appearance is poor, the indentation exists in a film pasting and the like are solved. Not only solves the customer complaints of film sticking indentation on site, but also improves the hardness of the whole paint film and the appearance of the paint film on the surface, so that the whole varnish is more suitable for industrialized application.
The melamine-based crosslinking agent is different from other amino resins for enhancing crosslinking, and the addition of the melamine-based crosslinking agent not only solves the problem of varnish anti-indentation of a protective film, but also solves the problem of varnish anti-indentationThe hardness of the paint film is also improved, and the good stability of the varnish system is ensured. In one example, the melamine based crosslinker is a trialkoxycarbonylaminotriazine crosslinker (TACT). The active imino of the cross-linking agent also has an active ester bond, and the use of the cross-linking agent in the technical scheme can solve the complaint of film indentation and simultaneously can improve the hardness and the appearance of a paint film. Further, exemplary trialkoxycarbonylaminotriazine cross-linking agents include, but are not limited to, Allnex corporation
Of NF 2000A Crossslinking AGENT, or BASF
150. In the present embodiment, the addition amount of the melamine-based crosslinking agent is preferably 3 to 5 parts by mass.
In the present embodiment, the hydroxyl polyester resin is also a hydroxyl-functionalized polyester resin. The hydroxyl polyester resin can well improve the stone chip resistance, the appearance leveling property and the like of the varnish composition. The melamine-based crosslinking agent is combined for use, and has good effects of improving the indentation resistance of the protective film, improving the hardness and improving the appearance of the varnish. The hydroxyl value of the preferred hydroxyl polyester resin is 430-480mg KOH/g, the number average molecular weight is 2400-2600, the weight average molecular weight is 3000-3300, and the nonvolatile matter content is 75 +/-1%. Exemplary hydroxy polyester resins include, but are not limited to, PRS-1014 from Nippon corporation. In a preferred example, the addition amount of the hydroxyl polyester resin is preferably 6 to 12 parts by mass. The addition amount of the hydroxyl polyester resin in combination with the specific melamine-based crosslinking agent can provide the varnish composition with more excellent resistance to indentation of a protective film, hardness and appearance.
In this embodiment, the carboxylic acid modified acrylic resin is also a half-esterified carboxylic acid based acrylic resin, and the acrylic resin contains both a carboxyl group and an ester group. Which combines good levelling with mechanical properties, the presence of which is the main resin in the varnish composition. Preferably, the carboxylic acid-modified acrylic resin has an acid value of 57-67mgKOH/g, a number average molecular weight of 1500-2500, a weight average molecular weight of 2500-3500, and a nonvolatile matter content of 72. + -. 1%. Exemplary carboxylic acid-modified acrylic resins include, but are not limited to, ACS-1218 from Nippon corporation. In a preferred example, the amount of the carboxylic acid-modified acrylic resin added is preferably 25 to 30 parts by mass.
In addition, epoxy-modified acrylic resins, i.e., epoxy-functionalized acrylic resins, combine good leveling with mechanical properties as a bulk crosslinking resin in the varnish composition. Preferably, the epoxy modified acrylic resin has an epoxy equivalent of 350-450, a number average molecular weight of 2500-3000, and a weight average molecular weight of 5000-6000. An exemplary such epoxy modified acrylic resin may be ACS-1211 from Nippon corporation. In a preferred example, the addition amount of the epoxy-modified acrylic resin is preferably 32 to 37 parts by mass.
In one example, the varnish composition further comprises a solvent. The solvent is used for balancing the overall construction performance and leveling performance of the formula, and preferably 3-5 solvents with different volatilization gradients are selected, and esters/alcohols/alcohol ethers and the like are mainly used, such as one or more of DBE, S-150 solvent oil, S-100 solvent oil, EEP, methanol, ethanol, n-butanol, butyl acetate and BDG. The amount of the solvent added is preferably 20 to 30 parts by mass.
In yet another example, the varnish composition further comprises one or more of a resin anchoring agent, a catalyst, a light stabilizer, a leveling agent and a defoaming agent.
Specifically, the resin anchoring agent is mainly used for balancing the properties of sagging and the like in the varnish film construction process. Exemplary resin anchoring agents include, but are not limited to, PZS-1030GZ by lippo corporation. In a preferred example, the resin anchoring agent is added in an amount of 5 to 8 parts by mass.
The catalyst may preferably be a salt catalyst, such as TB-1005 from Nippon. In a preferred example, the catalyst is added in an amount of 1 to 1.5 parts by mass.
In addition, the light stabilizer preferably includes, but is not limited to, one or more of HALS auxiliary, UV auxiliary. The HALS adjuvant may be a TINUVIN series from BASF or similar products from other companies, etc. The amount of the HALS adjuvant added is preferably about 0.7 to 1.5 parts by mass. The UV adjuvant can be TINUVIN 900/928 from BASF or CHISORB 234 with double bond. The amount thereof is preferably about 0.3 to 1.0 part by mass.
Exemplary leveling agents include, but are not limited to, 325/306 by BYK or other similar company adjuvants that have the same leveling effect. The amount thereof added is preferably 0.5 to 1 part by mass.
Exemplary defoamers include, but are not limited to, OX-6140/BYK-390 from DISPARLON and other similar agents that have the same defoaming effect. The amount thereof added is preferably 0.5 to 1 part by mass.
In still another preferred example, the amounts of parts by mass added mentioned in the present embodiment are each based on 100 parts by weight of the varnish composition.
Yet another embodiment of the present invention provides a method for preparing the varnish composition as described above, the method comprising the steps of:
and uniformly mixing the components, and adjusting the viscosity to obtain the varnish composition.
In a preferred example, the method comprises the steps of:
mixing the UV auxiliary agent and the solvent until the solution is clear and transparent, sequentially adding the HALS auxiliary agent, the resin anchoring agent and part of the carboxylic acid modified acrylic resin to obtain a mixed solution with the resin anchoring agent coated, sequentially adding the rest acrylic resin/polyester resin, the catalyst, the melamine-based crosslinking agent and the leveling agent/defoaming agent, diluting and adjusting the viscosity, Ford4# (27-30S/20 ℃), and obtaining the varnish composition.
Yet another embodiment of the present invention provides a varnish having a function of resisting protective film indentation self-repair, which is prepared from the varnish composition as described above. It is known that the varnish has the beneficial effects as described above for the varnish composition.
A further embodiment of the present invention provides the use of the varnish as described above in automotive coatings, in particular using the varnish as a top coat. More specifically, the varnish is used as a finish for coating an automobile body.
Particularly preferably, the application comprises the following steps: applying a water-based floating coat on a substrate, curing for 20min at 140 ℃, then applying a colored paint on the water-based floating coat, curing for 3min at 80 ℃, then applying the varnish, and curing for 20min at 140 ℃ to realize coating.
The technical scheme of the invention is described by combining a plurality of specific examples in the following:
test examples
Basic formulation 1
A varnish composition having the formulation shown in table 1 below.
TABLE 1 formulation of varnish compositions
The preparation of the varnish composition comprises the following steps:
mixing the UV auxiliary agent and the solvent until the solution is clear and transparent, sequentially adding the HALS auxiliary agent, the MG resin and part of carboxylic acid modified acrylic resin, and fully wrapping the MG resin; and adding the rest acrylic resin/polyester resin, the catalyst and the flatting agent/defoaming agent, uniformly mixing, adding a diluent to adjust the viscosity, Ford4# (27-30S/20 ℃), and obtaining the varnish composition.
The construction process of the varnish composition as varnish for coating on the vehicle body comprises the following steps:
water-based middle coating → 140 ℃ 20min → water-based colored paint → 80 ℃ 3min → varnish → 140 ℃ 20min → placement of 2Hr → vehicle body film → film uncovering after 5 days of exposure to the sun to check whether there is any mark.
The degree of marking is divided into 6 grades from 0 to 5 according to the severity (the comprehensive consideration of the number and depth of the marking), 5 is the most severe, and 0 is completely traceless. The method comprises the following specific steps:
severe (5-4);
slightly improved (3);
light (2-1);
almost no trace (0);
completely traceless is considered OK.
Test example 1
Testing whether the indentation generated after the protective film is covered on the varnish of the basic formula 1 is related to the dehydration rate of the colored paint:
the test conditions are shown in table 2 below:
TABLE 2 test conditions for determining whether indentation is related to the paint dehydration rate
And (4) conclusion: the generation of the mark is independent of the dehydration rate of the color paint and has little relation with the color paint layer.
Test example 2
Testing whether the indentation generated after the protective film is uncovered is related to different varnish systems:
the test conditions are shown in table 3 below:
TABLE 3 test conditions for determining whether the indentation is related to the paint dehydration rate
And (4) conclusion: the generation of impressions is related to the varnish layer;
the generation of print is in a relatively clear relationship with varnish systems, which are susceptible to print.
Test example 3
The effect of different modified varnish systems on the impression was tested: the varnish formulations are shown in table 4 below.
TABLE 4 varnish formulations
Table 4 above the impressions in the varnish are shown in table 5 below.
TABLE 5 varnish Properties
The varnish appearance results obtained in the above formulation of Table 4 are shown in Table 6 below.
TABLE 6 varnish appearance
And (4) conclusion: the degree of marking can be slightly reduced by reducing the content of the flexible polyester resin in the formula; the use of the amino resin and the acid catalyst in combination can reduce the degree of marking, but has a great influence on the appearance of the facade, and this cannot be said.
Test example 4
The effect of different modified varnish systems on the impression was tested:
the varnish formulations are shown in table 7 below.
TABLE 7 varnish formulations
Table 7 above shows the marking in the varnish as shown in table 8 below.
TABLE 8 varnish Properties
And (4) conclusion: the addition of the hyperbranched polyester resin/the scratch-resistant resin/the leveling aid has no obvious improvement on the impression.
Test example 5
The impact of different modified varnish systems on the impression, hardness was tested: the varnish formulations are shown in table 9 below.
TABLE 9 varnish formulations
Table 9 above shows the hardness of the marks in the varnishes as shown in table 10 below.
TABLE 10 varnish Properties
Table 9 above the appearance of the varnish coatings is shown in table 11 below.
TABLE 11 varnish appearance Properties
And (4) conclusion: sample 9 was added
NF 2000A CrossLinking AGENT, and adjusting a part of flexible polycarbonate resin, can remove all the marks of the film, and the hardness is improved from HB to H, and the appearance is also obviously improved.
Example 1
A varnish composition having a function of self-repairing of the indentation resistance of the protective film, whose formulation is shown in table 12 below.
TABLE 12 formulation of varnish compositions
Example 2
A varnish composition having a function of self-repairing of the indentation resistance of the protective film, whose formulation is shown in table 13 below.
TABLE 13 formulation of varnish compositions
Example 3
A varnish composition having a function of self-repairing of the indentation resistance of the protective film, whose formulation is shown in table 14 below.
TABLE 14 formulation of varnish compositions
The preparation method of the varnish of the above examples 1 to 3 comprises the following steps:
mixing the UV auxiliary agent and the solvent until the solution is clear and transparent, sequentially adding the HALS auxiliary agent, the resin anchoring agent and part of carboxylic acid modified acrylic resin to obtain a mixed solution with the resin anchoring agent coated, sequentially adding the rest acrylic resin/polyester resin, the catalyst and the rest auxiliary agent, diluting and adjusting the viscosity, Ford4# (27-30S/20 ℃), and obtaining the varnish composition.
The properties of the varnish of each of the above examples after curing to form a coating according to the method of the present invention are shown in Table 15 below.
TABLE 15 Properties of the coatings formed in examples 1-3
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (8)
1. The varnish composition with the function of resisting the indentation self-repairing of the protective film is characterized by comprising the following components in parts by weight:
25-30 parts of carboxylic acid modified acrylic resin, wherein the carboxylic acid modified acrylic resin contains carboxyl and ester groups, the acid value of the carboxylic acid modified acrylic resin is 57-67mgKOH/g, the number average molecular weight is 1500-;
32-37 parts of epoxy modified acrylic resin;
contains 6 to 12 parts of hydroxyl polyester resin, wherein the hydroxyl value of the hydroxyl polyester resin is 430-480mg KOH/g, the number average molecular weight is 2400-2600, and the weight average molecular weight is 3000-3300;
3-5 parts of a trialkoxycarbonylaminotriazine crosslinking agent;
20-30 parts of a solvent; and
and the auxiliary agent is one or more selected from resin anchoring agent, catalyst, light stabilizer, flatting agent and defoaming agent.
2. The varnish composition of claim 1, wherein the epoxy modified acrylic resin has an epoxy equivalent weight of 350-450, a number average molecular weight of 2500-3000, and a weight average molecular weight of 5000-6000.
3. The varnish composition of claim 1, wherein the solvent is selected from one or more of DBE, S-150 mineral spirits, S-100 mineral spirits, EEP, methanol, ethanol, n-butanol, butyl acetate, BDG.
4. The varnish composition of claim 1, wherein the light stabilizer is selected from one or more of a HALS adjuvant and a UV adjuvant.
5. The varnish composition of claim 4, wherein the varnish composition comprises, in parts by weight:
5-8 parts of a resin anchoring agent;
1-1.5 parts of a catalyst;
0.7-1.5 parts of UV auxiliary agent;
0.3-1.0 part of HALS auxiliary agent;
0.5-1 part of a leveling agent;
0.5-1 part of defoaming agent.
6. A process for preparing a varnish composition according to any one of claims 1 to 5 comprising the steps of:
and uniformly mixing the components, and adjusting the viscosity to obtain the varnish composition.
7. A varnish having a function of preventing self-repairing of a protective film indentation, which is prepared from the varnish composition according to any one of claims 1 to 5.
8. Use of the varnish according to claim 7 in automotive coatings, characterised in that the varnish is used as a top coat.
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