Acrylic resin paints and coating products

Abstract

This application relates to an acrylic resin coating and a coating product. The acrylic resin coating comprises component A and component B. Component A comprises, by weight, 35-56 parts (meth)acrylic polymer, 2-21 parts (polyester), 0.1-2 parts (phosphate compound), and 0.01-1 parts (catalyst). The phosphate compound is selected from at least one of monobasic and dibasic phosphates. Component B comprises a curing agent. When applied to repair varnishes, the acrylic resin coating exhibits excellent adhesion to both water-based and oil-based repair paints, achieving a balance between drying speed and high appearance. This effectively addresses the yellowing problem of traditional coatings applied to repair varnishes after exposure to sunlight.

Description

Technical Field

[0001] The present application relates to the field of coating technology, and in particular to an acrylic resin coating and a coating product. Background Art

[0002] Automotive paint films protect and decorate vehicles, but they often become damaged during use, necessitating repainting. However, with rising living standards, people's expectations for vehicle quality are growing. Traditional auto refinish clearcoats tend to yellow after exposure to the sun, severely impacting the vehicle's appearance, particularly on light-colored vehicles like white. Furthermore, traditional auto refinish clearcoats struggle to meet environmental regulations requiring a VOC (Volatile Organic Compound) level of 480 g / L or lower. Summary of the Invention

[0003] Based on this, the present application provides an acrylic resin coating and coating product with low VOC content and improved exposure resistance of the film layer.

[0004] The technical solution of this application to solve the above technical problems is as follows.

[0005] On one hand, the present application provides an acrylic resin coating, which includes component A and component B. Component A includes the following components in parts by mass:

[0006] 35-56 parts of (meth)acrylic acid polymer,

[0007] Polyester 2~21 parts,

[0008] 0.1 to 2 parts of a phosphate compound, and

[0009] Catalyst 0.01~1 part;

[0010] The phosphate compound is selected from at least one of monobasic phosphate and dibasic phosphate;

[0011] The B component includes a curing agent.

[0012] In some embodiments, in the acrylic resin coating, the mass ratio of the (meth)acrylic polymer, the polyester, and the phosphate ester compound is 1:(0.03-0.6):(0.008-0.015).

[0013] In some embodiments, in the acrylic resin coating, the structure of the phosphate compound is as shown in formula (I):

[0014]

[0015] (I)

[0016] Wherein, R1 and R2 are independently selected from hydrogen or C1~C8 alkyl, and R1 and R2 are not hydrogen at the same time.

[0017] In some embodiments, in the acrylic resin coating, in the phosphate ester compound, R1 is C x H 2x+1 , R2 is C y H 2y+1 , 0≤x≤8, 0≤y≤8, and x and y are not zero at the same time.

[0018] In some embodiments, in the acrylic resin coating, the phosphate compound is selected from at least one of monomethyl phosphate, monoethyl phosphate, monobutyl phosphate, dimethyl phosphate, diethyl phosphate, dibutyl phosphate and isopropyl phosphate.

[0019] In some embodiments, in the acrylic resin coating, the hydroxyl value of the (meth)acrylic polymer is 70 mg KOH / g to 150 mg KOH / g.

[0020] In some embodiments, in the acrylic resin coating, the acid value of the (meth)acrylic polymer is 0 mg KOH / g to 30 mg KOH / g.

[0021] In some embodiments, in the acrylic resin coating, the Tg value of the (meth)acrylic polymer is 30° C. to 80° C.

[0022] In some embodiments, in the acrylic resin coating, the weight average molecular weight Mw of the (meth)acrylic polymer is 4,000 to 20,000 Daltons.

[0023] In some embodiments, in the acrylic resin coating, the hydroxyl value of the polyester is 80 mg KOH / g to 300 mg KOH / g.

[0024] In some embodiments, in the acrylic resin coating, the acid value of the polyester is 3 mg KOH / g to 30 mg KOH / g.

[0025] In some embodiments, in the acrylic resin coating, the Tg value of the polyester is -100°C to 50°C.

[0026] In some embodiments, in the acrylic resin coating, the weight average molecular weight Mw of the polyester is 1000-10000 Daltons.

[0027] In some embodiments, in the acrylic resin coating, the catalyst is selected from at least one of dibutyltin dilaurate, dimethyltin dioctyldecanoate, dioctyltin oxide, and dibutyltin-2-ethylhexanoate.

[0028] In some embodiments, in the acrylic resin coating, the component A further comprises a first solvent.

[0029] In some embodiments, in the acrylic resin coating, the component A further comprises an additive, wherein the additive is selected from at least one of an ultraviolet light absorber, a light stabilizer, and a leveling agent.

[0030] In some embodiments, in the acrylic resin coating, the curing agent is selected from at least one of aliphatic polyisocyanate, alicyclic polyisocyanate and heterocyclic polyisocyanate.

[0031] In some embodiments, in the acrylic resin coating, the component B further comprises a second solvent, and the second solvent is selected from at least one of acetone, methyl ethyl ketone, cyclohexane, ethyl acetate, isobutyl acetate, 3-methoxybutyl acetate, butyl acetate (butyl acetate), sec-butyl acetate, isopropyl acetate, 3-ethoxyethyl propionate, methyl isobutyl ketone, methyl amyl ketone, trimethylbenzene, tetramethylbenzene, propylene glycol methyl ether acetate, toluene, xylene, ethylbenzene, diethyl carbonate, N,N-dimethylformamide, N,N-dimethylacetamide, N-methylpyrrolidone, 1,3-dioxolane and ethylene glycol diethyl ester.

[0032] In some embodiments, in the acrylic resin coating, the molar ratio of the hydroxyl group in the component A to the isocyanate group in the component B is (0.9-1.1):1.

[0033] In some embodiments, in the acrylic resin coating, the mass ratio of the component A to the component B is 2:1.

[0034] On the other hand, the present application provides a coating product, comprising a film layer formed by the above-mentioned acrylic resin coating.

[0035] Compared with the prior art, the acrylic resin coating of the present application has the following beneficial effects:

[0036] The acrylic resin coating comprises component A and component B. Component A and component B are mixed during use. The components work together to effectively improve the film's resistance to sunlight, thereby effectively resolving the yellowing problem of traditional coatings after exposure to sunlight. Furthermore, the VOC content is low, with a VOC of less than 420 g / L. Furthermore, the introduction of polyester effectively enhances the fluidity of the coating, resulting in a film obtained after curing of the acrylic resin coating having better appearance and performance, higher hardness, and better weather resistance. Furthermore, the water resistance, acid and alkali resistance, and gasoline resistance all meet requirements. DETAILED DESCRIPTION

[0037] Reference will now be made in detail to embodiments of the present invention, one or more examples of which are described below. Each example is provided to illustrate, not to limit, the present invention. Indeed, it will be apparent to those skilled in the art that various modifications and variations may be made to the present invention without departing from the scope or spirit of the invention. For example, features illustrated or described as part of one embodiment may be used in another embodiment to produce further embodiments.

[0038] Therefore, it is intended that the present invention covers such modifications and variations as come within the scope of the appended claims and their equivalents. Other objects, features, and aspects of the present invention are disclosed in or are obvious from the following detailed description. Those skilled in the art will appreciate that this discussion is merely a description of exemplary embodiments and is not intended to limit the broader aspects of the present invention.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0040] The term "comprises", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment comprising a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of further restrictions, the elements limited by the sentence "comprising a ..." do not exclude the presence of other identical elements in the process, method, article or equipment comprising the elements. The indefinite articles "a" and "an" before the elements or components of the present invention have no restriction on the quantity requirements (i.e., the number of occurrences) of the elements or components. Therefore, "a" or "a" should be interpreted as including one or at least one, and elements or components in the singular also include plural forms, unless the quantity obviously refers only to the singular form. The meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0041] The masses of the relevant components mentioned in the description of the embodiments of the present invention may not only refer to the specific content of each component, but also represent the proportional relationship between the masses of the components. Therefore, as long as the content of the relevant components is proportionally increased or decreased according to the description of the embodiments of the present invention, it is within the scope disclosed in the description of the embodiments of the present invention. Specifically, the masses described in the description of the embodiments of the present invention may be mass units known in the chemical industry, such as μg, mg, g, and kg.

[0042] Except as shown in the operating examples or otherwise indicated, all numbers used in the specification and claims to express the amount of ingredients, physicochemical properties, etc. are understood to be adjusted by the term "about" in all cases. For example, therefore, unless otherwise indicated, the numerical parameters listed in the above specification and the appended claims are approximate values, and those skilled in the art will be able to appropriately change these approximate values using the teachings disclosed herein to seek to obtain the desired properties. The use of numerical ranges expressed as endpoints includes all numbers within the range and any range within the range, for example, 1 to 5 includes 1, 1.1, 1.3, 1.5, 2, 2.75, 3, 3.80, 4 and 5, etc.

[0043] One embodiment of the present application provides an acrylic resin coating, which includes component A and component B. Component A includes the following components in parts by mass:

[0044] 35-56 parts of (meth)acrylic acid polymer,

[0045] Polyester 2~21 parts,

[0046] 0.1 to 2 parts of a phosphate compound, and

[0047] Catalyst 0.01~1 part;

[0048] The phosphate compound is selected from at least one of monobasic phosphate and dibasic phosphate;

[0049] Component B includes a curing agent.

[0050] The acrylic resin coating comprises component A and component B. When used, component A and component B are mixed. The components work together to effectively improve the film's resistance to sunlight, thereby effectively solving the problem of yellowing of traditional coatings after exposure to sunlight. Furthermore, the VOC content is low, with a VOC content of less than 420 g / L. Furthermore, the introduction of polyester effectively improves the coating's fluidity, resulting in a film obtained after curing the acrylic resin coating having good appearance and high hardness, good weather resistance, no chalking after 2000 hours of Q-UVB accelerated aging, a gloss loss rate of less than 5.6%, a color difference ΔE of less than 1.86, and satisfactory water resistance, acid and alkali resistance, and gasoline resistance.

[0051] It can be understood that the weight fractions of the (meth)acrylic polymer include but are not limited to 35 parts, 40 parts, 45 parts, 48 parts, 49 parts, 50 parts, 55 parts, and 56 parts; in some examples, it can be within a range consisting of any two of these point values as end values, the same below; for example, in some examples, the weight fractions of the (meth)acrylic polymer can also be 35-42 parts, 40-50 parts, 50-55 parts, etc.

[0052] The weight percentage of polyester includes, but is not limited to, 2 parts, 3 parts, 4 parts, 7 parts, 10 parts, 12 parts, 15 parts, and 21 parts. For example, in some examples, the weight percentage of polyester can also be 2-10 parts, 8-18 parts, 10-15 parts, 12-20 parts, etc.

[0053] The weight fraction of the phosphate compound includes, but is not limited to, 0.1 part, 0.2 part, 0.5 part, 0.8 part, 1 part, 1.2 parts, 1.5 parts, 1.8 parts, and 2 parts. For example, in some examples, the weight fraction of the phosphate compound may also be 0.1-2 parts, 0.2-1.8 parts, 0.5-1.5 parts, 0.8-1.2 parts, etc.

[0054] The mass fractions of the catalyst include, but are not limited to, 0.01 part, 0.05 part, 0.1 part, 0.2 part, 0.5 part, 0.8 part, and 1 part.

[0055] In some examples, in the acrylic resin coating, component A includes the following components in parts by mass:

[0056] 35-50 parts of (meth)acrylic acid polymer,

[0057] Polyester 7~21 parts,

[0058] 0.4 to 2 parts of a phosphate compound, and

[0059] 0.1~0.5 parts of catalyst.

[0060] In some of these examples, in the acrylic resin coating, the mass ratio of (meth)acrylic polymer, polyester and phosphate ester compound is 1:(0.03~0.6):(0.008~0.015).

[0061] It can be understood that the mass ratio of (meth)acrylic polymer to polyester includes but is not limited to 1:0.03, 1:0.04, 1:0.1, 1:0.2, 1:0.3, 1:0.4, 1:0.5, 1:0.6; the mass ratio of (meth)acrylic polymer to phosphate compound includes but is not limited to 1:0.008, 1:0.01, 1:0.012, 1:0.015.

[0062] In some examples, the structure of the phosphate compound in the acrylic resin coating is shown in formula (I):

[0063]

[0064] (I)

[0065] Wherein, R1 and R2 are independently selected from hydrogen or C1~C8 alkyl, and R1 and R2 are not hydrogen at the same time.

[0066] It is understood that the C1~C8 alkyl group can be linear, cyclic or branched; further, the C1~C8 alkyl group includes but is not limited to methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, neopentyl, tert-pentyl, and hexyl.

[0067] It can be further understood that when one of R1 and R2 is hydrogen, the phosphate compound is a monobasic phosphate, and when neither R1 nor R2 is hydrogen, the phosphate compound is a dibasic phosphate.

[0068] In some of these examples, the phosphate ester compound in the acrylic resin coating has R1 as C x H 2x+1 , R2 is C y H 2y+1 , 0≤x≤8, 0≤y≤8, and x and y are not zero at the same time.

[0069] It is understood that the phosphate ester compounds include, but are not limited to, methyl phosphate, dimethyl phosphate, ethyl phosphate, diethyl phosphate, propyl phosphate, isopropyl phosphate, diisopropyl phosphate, butyl phosphate, and dibutyl phosphate.

[0070] It is understood that the acrylic resin coating may contain only one of the monobasic phosphate ester and the dibasic phosphate ester, or may contain both.

[0071] In some examples, in the acrylic resin coating, the phosphate compound is selected from at least one of monomethyl phosphate, monoethyl phosphate, monobutyl phosphate, dimethyl phosphate, diethyl phosphate, dibutyl phosphate, and isopropyl phosphate.

[0072] In this application, solid content refers to the non-volatile content in the coating or resin, which is measured according to the provisions of GB / T 1725-2007. A sample of approximately 1.0 g is weighed and baked at (105±2)°C for 1 hour.

[0073] In this application, hydroxyl value (OHV) represents the number of milligrams of potassium hydroxide equivalent to the hydroxyl groups in 1 gram of sample, which is equal to the molar amount of acetic acid bound when acetylated to 1 gram of the corresponding solid resin component; acid value (AV) represents the amount of KOH consumed to neutralize 1 gram of solid resin (in milligrams, mg); Tg value represents the glass transition temperature, which is determined based on the experimental method of DIN 5376 "Thermal Analysis - Dynamic Scanning Calorimetry (DSC)"; weight-average molecular weight Mw is measured by gel permeation chromatography (GPC) using polystyrene as a standard sample;

[0074] In some of these examples, the (meth)acrylic polymer in the acrylic resin coating has a hydroxyl value of 70 mgKOH / g to 150 mgKOH / g.

[0075] It is understood that the hydroxyl value of the (meth)acrylic polymer includes but is not limited to 70 mg KOH / g, 80 mg KOH / g, 90 mg KOH / g, 100 mg KOH / g, 110 mg KOH / g, 120 mg KOH / g, 130 mg KOH / g, 140 mg KOH / g, and 150 mg KOH / g.

[0076] Optionally, the (meth)acrylic acid polymer has a hydroxyl value of 70 mg KOH / g to 120 mg KOH / g.

[0077] Furthermore, the (meth)acrylic acid polymer has a hydroxyl value of 80 mg KOH / g to 100 mg KOH / g.

[0078] In some of these examples, the (meth)acrylic polymer in the acrylic resin coating has an acid value of 0 mg KOH / g to 30 mg KOH / g.

[0079] It is understood that the acid value of the (meth)acrylic polymer includes, but is not limited to, 0 mg KOH / g, 1 KOH / g, 5 KOH / g, 10 KOH / g, 12 KOH / g, 16 KOH / g, 20 KOH / g, 25 KOH / g, and 30 mg KOH / g.

[0080] Optionally, the (meth)acrylic acid polymer has an acid value of 0 mg KOH / g to 20 mg KOH / g.

[0081] Furthermore, the acid value of the (meth)acrylic acid polymer is 0 mg KOH / g to 10 mg KOH / g.

[0082] In some of these examples, the Tg value of the (meth)acrylic polymer in acrylic resin coatings is 30°C to 80°C.

[0083] It is understood that the Tg value of the (meth)acrylic polymer includes, but is not limited to, 30°C, 40°C, 50°C, 60°C, 70°C, and 80°C.

[0084] Optionally, the (meth)acrylic polymer has a Tg value of 40°C to 70°C.

[0085] Furthermore, the Tg value of the (meth)acrylic polymer is 50°C to 70°C.

[0086] In some examples, the (meth)acrylic polymer in the acrylic resin coating has a weight average molecular weight Mw of 4,000 to 20,000 Daltons.

[0087] It is understood that the weight average molecular weight Mw of the (meth)acrylic polymer includes, but is not limited to, 4,000, 5,000, 8,000, 10,000, 12,000, 14,000, 15,000, 16,000, 18,000, and 20,000 Daltons.

[0088] Optionally, the (meth)acrylic acid polymer has a weight average molecular weight Mw of 5000 to 15000 Daltons.

[0089] Furthermore, the weight average molecular weight Mw of the (meth)acrylic acid polymer is 6,000 to 10,000 Daltons.

[0090] In some of these examples, the hydroxyl value of the polyester in an acrylic resin coating ranges from 80 mg KOH / g to 300 mg KOH / g.

[0091] It will be appreciated that the hydroxyl value of the polyester includes, but is not limited to, 80 mg KOH / g, 90 mg KOH / g, 100 mg KOH / g, 110 mg KOH / g, 120 mg KOH / g, 130 mg KOH / g, 140 mg KOH / g, 150 mg KOH / g, 180 mg KOH / g, 200 mg KOH / g, 220 mg KOH / g, 250 mg KOH / g, 280 mg KOH / g, 300 mg KOH / g,.

[0092] Optionally, the polyester has a hydroxyl value of 100 mg KOH / g to 250 mg KOH / g.

[0093] Furthermore, the hydroxyl value of the polyester is 120 mg KOH / g to 200 mg KOH / g.

[0094] In some of these examples, the acid number of the polyester in an acrylic resin coating is 3 mg KOH / g to 30 mg KOH / g.

[0095] It is understood that the acid value of the polyester includes but is not limited to 3 KOH / g, 5 KOH / g, 10 KOH / g, 12 KOH / g, 16 KOH / g, 20 KOH / g, 25 KOH / g, and 30 mg KOH / g.

[0096] Optionally, the acid value of the polyester is 3 mg KOH / g to 20 mg KOH / g.

[0097] Furthermore, the acid value of the polyester is 3 mg KOH / g to 10 mg KOH / g.

[0098] In some examples, the Tg value of polyester in acrylic resin coatings ranges from -100°C to 50°C.

[0099] It will be appreciated that the Tg values of polyester include, but are not limited to, -100°C, -70°C, -50°C, -30°C, -10°C, 0°C, 10°C, 30°C, 40°C, and 50°C.

[0100] Optionally, the Tg value of the polyester is -70°C to 30°C.

[0101] Furthermore, the Tg value of the polyester is -50°C to 10°C.

[0102] In some examples, the weight average molecular weight (Mw) of the polyester in the acrylic resin coating is 1,000 to 10,000 Daltons.

[0103] It is understood that the weight average molecular weight Mw of the polyester includes but is not limited to 1000, 2000, 4000, 5000, 8000, 10000 Daltons.

[0104] Optionally, the polyester has a weight average molecular weight Mw of 1000 to 7000 Daltons.

[0105] Furthermore, the weight average molecular weight Mw of the polyester is 2000-5000 Daltons.

[0106] In some examples, in the acrylic resin coating, the catalyst is selected from at least one of dibutyltin dilaurate, dimethyltin dioctyldecanoate, dioctyltin oxide, and dibutyltin-2-ethylhexanoate.

[0107] Optionally, the catalyst is selected from at least one of dibutyltin dilaurate and dibutyltin-2-ethylhexanoate.

[0108] In some examples, in the acrylic resin coating, component A further includes a first solvent.

[0109] In some examples, in the acrylic resin coating, the first solvent is selected from at least one of acetone, methyl ethyl ketone, cyclohexane, ethyl acetate, isobutyl acetate, 3-methoxybutyl acetate, butyl acetate, sec-butyl acetate, isopropyl acetate, ethyl 3-ethoxypropionate, methyl isobutyl ketone, methyl amyl ketone, trimethylbenzene, tetramethylbenzene, propylene glycol methyl ether acetate, toluene, xylene, ethylbenzene, diethyl carbonate, N,N-dimethylformamide, N,N-dimethylacetamide, N-methylpyrrolidone, 1,3-dioxolane and ethylene glycol diethyl ester.

[0110] In some of these examples, the A component of the acrylic resin coating also includes additives.

[0111] It can be understood that component A may include additives commonly used in coatings, which can be selected according to the actual application of the coating. For example, additives that improve the surface activity of the coating include dispersants, wetting agents, emulsifiers, demulsifiers, defoamers, foaming agents, antistatic agents, etc.; additives with catalytic effects include initiators, driers, curing agents, coupling agents, inhibitors, photoinitiators, anti-skinning agents, antioxidants, antibacterial agents, mildew inhibitors, etc.; functional additives include metal powders, graphite powders, carbon fibers, etc. that need to be added to conductive coatings, and materials such as titanium, aluminum, chromium, etc. that absorb and dissipate gamma rays used in radiation-proof coatings.

[0112] In some examples, in the acrylic resin coating, the additive is selected from at least one of a UV absorber, a light stabilizer, and a leveling agent.

[0113] Furthermore, the ultraviolet light absorber is Tinuvin 1130.

[0114] Furthermore, the light stabilizer is Tinuvin 292.

[0115] Furthermore, the leveling agent is BYK 331.

[0116] In some examples, in the acrylic resin coating, the curing agent is selected from at least one of aliphatic polyisocyanate, alicyclic polyisocyanate and heterocyclic polyisocyanate.

[0117] By using a specific type of curing agent, it is helpful to further improve the exposure resistance of acrylic resin coatings.

[0118] Optionally, the curing agent is selected from at least one of aliphatic polyisocyanate and alicyclic polyisocyanate.

[0119] It is understood that aliphatic polyisocyanates include but are not limited to hexamethylene diisocyanate (HDI), 2,2,4-trimethylhexane diisocyanate (TMHDI) and polymers thereof; alicyclic polyisocyanates include but are not limited to isophorone diisocyanate (IPDI), methylcyclohexamethylene diisocyanate (HTDI) and polymers thereof.

[0120] In some of these examples, the curing agent in acrylic resin coatings is an oligomer of hexamethylene diisocyanate.

[0121] Furthermore, the curing agent is selected from at least one of HDI dimer, HDI trimer, HDI pentamer and HDI heptamer.

[0122] In some examples, in the acrylic resin coating, component B further comprises a second solvent, and the second solvent is selected from at least one of acetone, methyl ethyl ketone, cyclohexane, ethyl acetate, isobutyl acetate, 3-methoxybutyl acetate, butyl acetate, sec-butyl acetate, isopropyl acetate, ethyl 3-ethoxypropionate, methyl isobutyl ketone, methyl amyl ketone, trimethylbenzene, tetramethylbenzene, propylene glycol methyl ether acetate, toluene, xylene, ethylbenzene, diethyl carbonate, N,N-dimethylformamide, N,N-dimethylacetamide, N-methylpyrrolidone, 1,3-dioxolane and ethylene glycol diethyl ester.

[0123] It can be understood that the second solvent has good solubility for the polyisocyanate compound and does not react with the polyisocyanate compound.

[0124] In some of these examples, in the acrylic resin coating, the molar ratio of the hydroxyl groups in component A to the isocyanate groups in component B is (0.9~1.1):1.

[0125] It will be appreciated that the molar ratio of hydroxyl groups in component A to isocyanate groups in component B includes, but is not limited to, 0.9:1, 0.92:1, 0.95:1, 0.98:1, 1.0:1, 1.02:1, 1.05:1, 1.08:1, and 1.1:1.

[0126] Optionally, the molar ratio of the hydroxyl groups in component A to the isocyanate groups in component B is (0.95-1.05):1.

[0127] In some of these examples, the mass ratio of component A to component B in acrylic resin coatings is (1~3):1.

[0128] Optionally, the mass ratio of component A to component B is 2:1.

[0129] It can be understood that component A and component B are stored separately and mixed in accordance with the above ratios when used.

[0130] In some of these examples, the acrylic resin coating is a clear lacquer coating.

[0131] In some of these examples, the acrylic paint is a touch-up varnish.

[0132] The above acrylic resin coating, when applied to repair varnish, has good adhesion to both water-based repair paint and oil-based repair paint, can achieve a balance between drying speed and high appearance, and effectively solve the problem of traditional coatings turning yellow after being exposed to the sun when applied to repair varnish.

[0133] An embodiment of the present application provides a method for preparing an acrylic resin coating, comprising steps S10 to S20:

[0134] Step S10: providing raw materials according to the components of the acrylic resin coating, mixing the raw materials, and stirring them evenly to obtain component A.

[0135] Furthermore, in step S10 , the (meth)acrylic polymer, polyester, phosphate compound, additive and solvent are mixed and stirred uniformly to obtain component A.

[0136] Step S20: Mix the curing agent and the second solvent, and stir them evenly to obtain component B.

[0137] In some examples, step S20 is performed under protective atmosphere conditions.

[0138] Optionally, the protective atmosphere nitrogen is selected from one of nitrogen and argon.

[0139] Furthermore, the protective atmosphere is nitrogen.

[0140] One embodiment of the present application provides a coating film formed from the above-mentioned acrylic resin coating.

[0141] One embodiment of the present application provides the use of the above-mentioned acrylic resin coating in preparing a coating product. Another embodiment of the present application provides a coating product, comprising a film layer formed by the above-mentioned acrylic resin coating.

[0142] The above coating has good exposure resistance and can effectively avoid the problem of traditional coating turning yellow after being exposed to the sun.

[0143] In some embodiments, the coated products include, but are not limited to, automobiles, ships, machinery and other fields.

[0144] The following examples are given based on the acrylic resin coating and coating products of the present application. It should be understood that the acrylic resin coating and coating products of the present application are not limited to the following embodiments.

[0145] The raw material information in each embodiment and comparative example is as follows:

[0146] (Meth)acrylic acid polymer a1 solution: Tg = 53°C, OHV = 100 mg KOH / g, Mw = 7000 Daltons, AV = 8 mg KOH / g, solid content 70%, balance n-butyl acetate;

[0147] (Meth)acrylic acid polymer a2 solution: Tg = 30 °C, OHV = 150 mg KOH / g, Mw = 10,000 Daltons, AV = 2 mg KOH / g, solid content 70%, balance n-butyl acetate;

[0148] (Meth)acrylic acid polymer a3 solution: Tg = 80°C, OHV = 100 mg KOH / g, Mw = 4000 Daltons, AV = 8 mg KOH / g, solid content 70%, balance n-butyl acetate;

[0149] (Meth)acrylic acid polymer a4 solution: Tg = 80 °C, OHV = 40 mg KOH / g, Mw = 5000 Daltons, AV = 0 mg KOH / g, solid content 70%, balance n-butyl acetate;

[0150] Polyester b1 solution: Tg = -20 °C, OHV = 100 mg KOH / g, Mw = 7000 Daltons, AV = 3 mg KOH / g, solid content 70%, balance n-butyl acetate;

[0151] Polyester b2 solution: Tg = 20 ° C, OHV = 180 mg KOH / g, Mw = 3000 Daltons, AV = 8 mg KOH / g, solid content 70%, balance n-butyl acetate;

[0152] Phosphate compound c1: monoisopropyl phosphate;

[0153] Phosphate compound c2: dibutyl phosphate;

[0154] Phosphate compound c3: trimethyl phosphate;

[0155] Catalyst d1: dibutyltin dilaurate;

[0156] Catalyst d2: dibutyltin-2-ethylhexanoate;

[0157] Ultraviolet light absorber (UV-P): Tinuvin 1130, purchased from BASF;

[0158] Light stabilizer: Tinuvin 292, purchased from BASF;

[0159] Leveling agent: BYK 331, purchased from BYK;

[0160] Curing agent e1: HDI trimer, Desmodur N3300 purchased from Covestro;

[0161] Curing agent e2: HDI trimer, HT-100, purchased from Wanhua;

[0162] Solvent f1: butyl acetate;

[0163] Solvent f2: propylene glycol methyl ether acetate.

[0164] Example 1

[0165] (1) Repair varnish component A

[0166] In a container equipped with a stirrer, 70 kg of a (meth)acrylic resin a1 solution having a solid content of 70% (i.e., 49 kg of (meth)acrylic resin a1), 10 kg of a polyester b1 solution having a solid content of 70% (i.e., 7 kg of polyester b1), 0.4 kg of monoisopropyl phosphate, 0.2 kg of dibutyltin dilaurate, 1.6 kg of Tinuvin 1130, 0.8 kg of Tinuvin 292, 0.1 kg of BYK 331, and 16.9 kg of n-butyl acetate were added in sequence under stirring, and the mixture was uniformly stirred to obtain component A of the repair varnish.

[0167] (2) Repair varnish component B

[0168] In a container equipped with a stirrer, under nitrogen protection, 38 kg of Desmodur N3300, 30 kg of n-butyl acetate, and 32 kg of propylene glycol methyl ether acetate were added in sequence and stirred evenly to obtain component B of the repair varnish.

[0169] The preparation methods of other embodiments and comparative examples are the same as those of Example 1, except that the raw materials are different, as shown in Table 1.

[0170] Table 1

[0171]

[0172] Comparative Example 5

[0173] The method is basically the same as Example 1, except that the phosphate compound is replaced with an equal mass of trimethyl phosphate.

[0174] Performance Testing

[0175] The car door skin was polished with 600-mesh sandpaper and the dust was wiped off with a dust-free rag; then, multi-purpose putty 839-20 (purchased from BASF) was scraped on, and after drying, it was polished with 1000-mesh sandpaper and the polishing dust was wiped off. Then, 740 repair primer and water-based white repair paint from Kansai Paint Co., Ltd. of Japan were sprayed; finally, the repair varnish component A and component B in each embodiment and comparative example were mixed in a mass ratio of 2:1, the treated door skin was covered with varnish, and the coating liquid parameters, coating workability and coating film performance were tested respectively.

[0176] Among them, the appearance grade evaluation is carried out by using a BYK orange peel meter to conduct long and short wave tests on different parts of the door skin under the same matching and same varnish film thickness conditions, with grade 5 being the best and grade 1 being the worst; the surface drying speed and polishing time tests are carried out at 25°C, the water resistance test conditions are 40°C*240 h, the gasoline resistance test conditions are 92# gasoline*6 h, the acid resistance test conditions are 0.1 mol / L H2SO4*24 h, and the alkali resistance test conditions are 0.1 mol / L NaOH*24 h. The aging gloss loss rate refers to the gloss loss rate after 2000 h of Q-UVB artificial accelerated aging, the aging color difference ΔE refers to the color difference ΔE after 2000 h of Q-UVB artificial accelerated aging, and the exposure yellowing Δb test conditions are continuous exposure to sunlight for 7 days at a temperature >30°C.

[0177] The test results of the embodiment are shown in Table 2.

[0178] Table 2

[0179]

[0180] The test results of the comparative example are shown in Table 3.

[0181] Table 3

[0182]

[0183] As can be seen from Tables 2 and 3, Comparative Examples 1 and 4 did not add phosphate compounds, and their exposure yellowing Δb reached 4.32 and 6.85 respectively, and the paint film was visually obviously yellowed; Comparative Example 2 did not add polyester, and its appearance was poor; Comparative Example 3 had an inappropriate ratio of acrylic resin and polyester, low adhesion, and a long polishing time, that is, the coating film hardness and polishing finish were insufficient; Comparative Example 5, the phosphate compound was replaced with an equal mass of trimethyl phosphate, and its aging gloss loss rate, aging color difference and exposure yellowing Δb were significantly reduced; From the comparison of Tables 2 and 3, it can be seen that compared with the comparative examples, the coating film formed by the acrylic resin coating prepared in the embodiment has better comprehensive properties such as weather resistance, exposure resistance, hardness and appearance.

[0184] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0185] The embodiments described above only express several implementation methods of the present application, which are convenient for understanding the technical solutions of the present application in a specific and detailed manner, but they cannot be understood as limiting the scope of protection of the invention patent. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present application, several variations and improvements can be made, which all fall within the scope of protection of the present application. It should be understood that the technical solutions obtained by those skilled in the art through logical analysis, reasoning or limited experiments on the basis of the technical solutions provided in the present application are all within the scope of protection of the claims attached to the present application. Therefore, the scope of protection of the patent of this application shall be based on the content of the attached claims, and the description can be used to interpret the content of the claims.

Claims

1. An acrylic resin coating, characterized in that The acrylic resin coating comprises component A and component B; the component A comprises the following components in parts by mass: The phosphate compound is selected from at least one of monobasic phosphate and dibasic phosphate; The B component includes a curing agent; The structure of the phosphate compound is shown in formula (I): Wherein, R1 and R2 are independently selected from hydrogen or C1-C8 alkyl, and R1 and R2 are not hydrogen at the same time.

2. The acrylic resin coating according to claim 1, wherein In the phosphate compound, R1 is C x H 2x+1 , R2 is C y H 2y+1 , 1≤x≤8, 1≤y≤8.

3. The acrylic resin coating according to claim 1 or 2, wherein: The phosphate compound is selected from at least one of monomethyl phosphate, monoethyl phosphate, monobutyl phosphate, dimethyl phosphate, diethyl phosphate, dibutyl phosphate and isopropyl phosphate.

4. The acrylic resin coating according to any one of claims 1 to 2, characterized in that The (meth)acrylic polymer comprises at least one of the following features (1) to (4): (1) The hydroxyl value of the (meth)acrylic acid polymer is 70 mg KOH / g to 150 mg KOH / g; (2) the acid value of the (meth)acrylic acid polymer is 0 mg KOH / g to 30 mg KOH / g; (3) the Tg value of the (meth)acrylic acid polymer is 30° C. to 80° C.; (4) The weight average molecular weight Mw of the (meth)acrylic acid polymer is 4,000 to 20,000 Daltons.

5. The acrylic resin coating according to any one of claims 1 to 2, characterized in that: The polyester comprises at least one of the following features (1) to (4): (1) The polyester has a hydroxyl value of 80 mg KOH / g to 300 mg KOH / g; (2) the acid value of the polyester is 3 mg KOH / g to 30 mg KOH / g; (3) The Tg value of the polyester is -100°C to 50°C; (4) The weight average molecular weight Mw of the polyester is 1000 to 10000 Daltons.

6. The acrylic resin coating according to any one of claims 1 to 2, characterized in that: The catalyst is selected from at least one of dibutyltin dilaurate, dimethyltin dioctyldecanoate, dioctyltin oxide and dibutyltin-2-ethylhexanoate.

7. The acrylic resin coating according to any one of claims 1 to 2, characterized in that: The A component further includes a first solvent.

8. The acrylic resin coating according to any one of claims 1 to 2, characterized in that: The curing agent is selected from at least one of aliphatic polyisocyanate, alicyclic polyisocyanate and heterocyclic polyisocyanate.

9. The acrylic resin coating according to any one of claims 1 to 2, characterized in that: The B component also includes a second solvent, which is selected from at least one of acetone, methyl ethyl ketone, cyclohexane, ethyl acetate, isobutyl acetate, 3-methoxybutyl acetate, butyl acetate, sec-butyl acetate, isopropyl acetate, 3-ethoxyethyl propionate, methyl isobutyl ketone, methyl amyl ketone, trimethylbenzene, tetramethylbenzene, propylene glycol methyl ether acetate, toluene, xylene, ethylbenzene, diethyl carbonate, N,N-dimethylformamide, N,N-dimethylacetamide, N-methylpyrrolidone, 1,3-dioxolane and ethylene glycol diethyl ester.

10. The acrylic resin coating according to any one of claims 1 to 2, characterized in that: The mass ratio of the component A to the component B is 2:

1.

11. A coating product, characterized in that: A film layer formed by the acrylic resin coating according to any one of claims 1 to 10.

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