KR100335395B1 - The high solids acrylic resin composite and its composite containd by paint - Google Patents

Abstract

The present invention relates to a high-solid acrylic resin composition and a coating material containing the composition, while expressing high elasticity and high durability at the time of crosslinking, it is not only excellent in scratch resistance by expanding the elastic region of the coating film and expressing great breaking energy. The purpose of the present invention is to provide a high-solid acrylic resin composition and a coating material containing the composition which improve the contamination, adhesion and surface hardness, and maintain the hydrophilicity of the coating film, and which have excellent water resistance, weather resistance, and sensibility and impart non-pollution characteristics. In order to achieve the above object, the present invention is a high-solid acrylic resin composition comprising a methacryl-based monomer, a chain transfer agent and an initiator, wherein the methacryl-based monomer is 50 to 80 parts by weight of methacryl-based monomer having an aliphatic group Parts by weight, 10 to 40 parts by weight of methacryl-based monomer having a hydroxyl group, higher alkyl 5 parts by weight to 50 parts by weight of an acrylic or methacrylic functional monomer having a group, 1 part by weight to 20 parts by weight of a methacrylic monomer containing a metal component, 2 parts by weight to 8 parts by weight of a chain transfer agent including a hydroxyl group and an initiator It can achieve by providing the high solid acrylic resin composition which consists of 3 weight part-9 weight part, and contains 1 weight part-20 weight part of silicone monomers.

Description

The high solids acrylic resin composition and the coating containing the composition {The high solids acrylic resin composite and its composite containd by paint}

The present invention relates to a high solid acrylic resin composition and a coating containing the composition, and more particularly, to a high solid acrylic resin composition excellent in scratch resistance, lightness and smoothness and a coating containing the composition.

Recently, in developed countries including the US, emission allowances for volatile organic compounds (VOCs) have been strictly strengthened in relation to air pollution problems, and environmental regulations for VOCs have begun in Korea since 1999.

As a proper countermeasure against this, a method of using a ql fouling paint that can relatively lower the content of VOC has been proposed.

Conventional non-polluting paints are known as silicone or acrylic resin paints, fluororesin paints and emulsion resin paints.

However, the silicone and acrylic resin paints are difficult to cure, and the fluorine resin paints exhibit high solubility in solvents by introducing higher alkyl groups in the structure, and have a low polarization so that contaminants are not easily adsorbed onto the coating film and difficult to remove traces of contamination. There is a problem that can not maintain aesthetic appearance for a long time.

In addition, emulsion resin paint is an aqueous paint prepared by using emulsion resin using acrylic monomer as a binder and mixing pigments, fillers and additives. The problem of poor repair and coating and difficult to apply to the exterior finishing material of the difficult repainting problem occurred.

Accordingly, in order to fundamentally improve the fouling resistance of the paint, the surface of the coating is replaced with a hydrophilic component to weaken the binding force with lipophilic substances such as exhaust gas and soot, which are the main causes of contamination, and increase the crosslinking density of the coating to increase the pollutants. In addition to being difficult to penetrate, high-solidification research and development of non-contaminating paints, which introduces the ability of attached contaminants to be easily removed by rainwater, is absolutely necessary.

In particular, the high solid resin paints are excellent in workability, can be used as existing manufacturing, painting equipment, and can be reduced in the content of VOCs in the resin and paint industry in terms of reducing the content of VOC.

According to the above-mentioned high solid resin paints, `` Seonyoung high solid resin composition and preparation method thereof '' of Korean Patent No. 143193, 1 to 5 parts by weight of a vinyl monomer having an organic acid group and 15 to 50 weight of a vinyl monomer having a hydroxyl group Part, comprising 15 to 35 parts by weight of a vinyl monomer having an aromatic group and 15 to 65 parts by weight of a vinyl monomer having an aliphatic group, having an acid value of 5 to 30 mg KOH / g, a hydroxyl group content of 2 to 6%, and a glass transition temperature. The acrylic resin composition and the acrylic resin composition for high-efficiency high-solid resin coating material having a -15 to 30 DEG C, a 25 DEG C Gardner viscosity of YZ ₃ , a number average molecular weight of 3000 to 8000, and a molecular weight distribution of 3 or less are aromatic hydrocarbons. The initiator solution was added dropwise for 3 to 6 hours in a solvent containing 99.2% or more of solvent, respectively for 4 to 6 hours at a temperature of 130 to 170 ° C. Polymerization which discloses a high linear spiritual high solid coating resin production method of the composition for an acrylic resin.

However, the low molecular weight acrylic resin used in the high solid resin coating composition exhibits a phenomenon of deterioration of coating properties such as weather resistance and coating appearance performance such as flowability and smoothness, and a broad molecular weight distribution and a distribution of hydroxyl groups which become a crosslinking point is resin. There is a problem that the coating film performance, such as water resistance, scratch resistance, chemical resistance, etc. are poor due to the presence of some acrylic resin molecules that do not participate in the crosslinking because the uniform crosslink density is not formed for each molecule.

Accordingly, the present invention is to solve the above-mentioned problems, while expressing high elasticity and high durability at the time of crosslinking, it is excellent in scratch resistance by expanding the elastic region of the coating film and expressing large breaking energy, as well as stain resistance, adhesion and It is an object of the present invention to provide a high-solid acrylic resin composition and a coating material containing the composition which improve the surface hardness and the like and maintain the hydrophilicity of the coating film, which are excellent in water resistance, weather resistance, and sensibility and impart non-pollution characteristics.

In order to achieve the above object, the present invention provides a high solid acrylic resin composition comprising a methacryl monomer, a chain transfer agent and an initiator, wherein the methacryl monomer is 50 parts by weight to 80 parts by weight of a methacryl monomer having an aliphatic group 10 to 40 parts by weight of the methacrylic monomer having a hydroxyl group, 5 to 50 parts by weight of the acrylic or methacrylic functional monomer having a higher alkyl group, 1 to 20 parts by weight of the methacrylic monomer containing a metal component Achieved by providing a high solid acrylic resin composition comprising 1 part by weight to 20 parts by weight of a silicone monomer, consisting of 2 parts by weight to 8 parts by weight and an initiator 3 parts by weight to 9 parts by weight, including a hydroxyl group. can do.

In addition, the present invention is 50 to 80 parts by weight of methacryl-based monomer having an aliphatic group, 10 to 40 parts by weight of methacryl-based monomer having a hydroxyl group, acrylic or methacryl-based in order to more effectively prepare a high-solid acrylic resin composition 5 parts by weight to 50 parts by weight of functional monomers, 1 part by weight to 20 parts by weight of the methacrylic monomer containing a metal component, 1 part by weight to 20 parts by weight of a silicone monomer, and 2 parts by weight to 8 parts by weight of a chain transfer agent including a hydroxyl group 3 to 9 parts by weight of the initiator and the dropwise addition to the middle boiling point solvent for 6 hours to 8 hours, the polymerization method of the high-solid acrylic resin composition by polymerization at a temperature of 110 ℃ to 150 ℃ for 8 hours to 11 hours to provide.

In addition, 60 to 90 parts by weight of the high-solid acrylic resin composition having the composition described above, and 10 to 40 parts by weight of a low-viscosity, non-degradable aliphatic polyisocyanate resin composition, 60% solids, viscosity 16 to 20 seconds (Zahn The paint containing the high solid acrylic resin composition by having # 2) is provided.

Hereinafter, the high solid acrylic resin composition of the present invention and a manufacturing method thereof will be described in detail.

First, the high solid acrylic resin composition according to the present invention is prepared by radically polymerizing various types of monomers having a vinyl double bond of acrylic acid ester or methacrylic acid ester in a solution using a thermal decomposition initiator.

The monomers having a vinyl double bond include 50 parts by weight to 80 parts by weight of an methacryl monomer having an aliphatic group, 10 parts by weight to 40 parts by weight of a methacryl monomer having a hydroxyl group, and 5 parts by weight of an acrylic or methacrylic functional monomer. To 50 parts by weight, 1 to 20 parts by weight of the methacryl monomer containing a metal component, 1 to 20 parts by weight of the silicone monomer, and 2 to 8 parts by weight of the chain transfer agent including a hydroxyl group and 3 parts by weight of the initiator To 9 parts by weight.

At this time, the methacrylate monomer having an aliphatic group includes at least one of butyl methacrylate, methyl methacrylate, ethyl methacrylate, 2-ethylhexyl methacrylate, lauryl methacrylate, isobornyl methacrylate, and the like. It can mix and use above.

In addition, the methacryl-based monomer having a hydroxyl group is added to 10 parts by weight to 40 parts by weight in consideration of the co-condensation reaction with the inorganic silicone material and crosslinking with the isocyanate, particularly preferably 13 to 35 parts by weight. Do.

When the amount of the methacryl-based monomer having a hydroxyl group is added in less than 10 parts by weight, the position at which the inorganic silicone material can be added decreases and affects the crosslinking density with isocyanate, resulting in a decrease in coating properties. When the amount of the methacrylic monomer added exceeds 40 parts by weight, the excessive increase in the crosslinking density causes problems such as hardening of the coating film, storage stability, poor compatibility with the crosslinking agent and the nonpolar solvent.

2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, etc. can be used as a methacryl-type monomer which has the said hydroxyl group.

In addition, the acrylic or methacrylic functional monomer having a higher alkyl group used in the present invention increases the elasticity of the coating film and increases the crosslinking density in the crosslinking reaction with polyisocyanate to form a dense coating film, thereby providing flexibility and scratch resistance of the coating film. In order to improve, 5 parts by weight to 50 parts by weight are added in consideration of viscosity and degree of crosslinking. Particularly, 5 parts by weight to 20 parts by weight is preferably added.

When the amount of the acrylic or methacrylic functional monomer having a higher alkyl group is less than 5 parts by weight, the crosslinking density decreases during the crosslinking reaction, resulting in a decrease in scratch resistance and fouling resistance, and more than 50 parts by weight. When added, there is a problem that the coating film hardness is lowered.

In this case, the acryl- or methacryl-based functional monomer having a higher alkyl group may be acetoacetoxyethyl methacrylate having an acetoacetyl group, an ε -caprolactone acrylate monomer having a hydroxyl group, and the like.

When the functional group of the soft component is introduced into the acrylic resin structure as described above, the acrylic resin composition having excellent scratch resistance can be obtained by expressing high elasticity and high durability at the time of crosslinking and expressing the elastic region of the coating film and the large breaking energy. will be.

In addition, the methacryl-based monomer containing a metal component is added 1 to 20 parts by weight of monomers for the purpose of improving the hardness of the coating film and adhesion to the coating material, in particular 1 to 10 parts by weight It is preferable.

When the amount of the metal component-containing methacryl-based monomer is added in an amount less than 1 part by weight, the hardness of the coating film and the adhesion of the coating film may be deteriorated. There is a problem that it is difficult to make a high solid to rise rapidly.

Metal methacrylate monomers used in the present invention used zinc methacrylate or titanium methacrylate, the titanium methacrylate is isopropyl titanate or tetra- normal butyl titanate and tetrakis-2- After reacting an alkyl titanate such as ethylhexyl titanate with a fatty acid having 8 to 12 carbon atoms, it was used to synthesize methacrylic acid and denature it.

In addition, the present invention is to replace the surface of the coating film with a hydrophilic component to weaken the bonding force with lipophilic materials such as exhaust gas, soot, which is the main factor of pollution, and to increase the crosslinking density of the coating film is difficult to penetrate, even if the contamination Silicone monomers are added so that the attached contaminants can be easily removed by rainwater.

In this case, when the amount of the silicone monomer added is less than 1 part by weight, there is a problem that the fouling resistance is lowered, and when added to exceed 20 parts by weight, excessive viscosity rise and the hydroxyl concentration is reduced to reduce the crosslinking density. Therefore, the addition amount of the silicone monomer is preferably added 1 part by weight to 20 parts by weight, and particularly preferably 1 part by weight to 10 parts by weight.

As the silicone monomers, silicates having an alkoxy group or a hydroxyl group, such as ethyl silicate and tetrakis-2-ethylorthosilicate, and alkylalkoxysilane compounds such as methylmethoxysilane can be used.

In addition, the chain transfer agent including a hydroxyl group plays an important role in lowering the molecular weight of the resin during the polymerization reaction, and is finally bonded to the terminal of the synthetic polymer to increase the density of the hydroxyl group which is a crosslinking point with the crosslinking agent when forming a coating film and cures. It is added to make the polymer chain.

In this case, when the amount of the chain transfer agent including a hydroxyl group is added in an amount less than 2 parts by weight, the viscosity may not be easily adjusted. Therefore, the amount of the chain transfer agent including the hydroxyl group may not be added to 8 parts by weight. It is preferable to add 8 weight part by weight, and it is preferable to add 3 weight part-6 weight part especially.

It is preferable to use 2-mercaptoethanol, 2-hydroxyethyl-3- mercaptopropionate, etc. which contain a hydroxyl group as a compound which can be added with the said chain transfer agent containing a hydroxyl group.

In addition, the molecular weight of the high-solid acrylic resin composition is adjusted by adding a radical polymerizable initiator. The amount of the initiator is in the range of 3 parts by weight to 10 parts by weight, which is three times higher than the amount of the common acrylic resin initiator, and preferably 3 parts by weight to It is preferable to add 8 weight part.

In this case, when the amount of the radical initiator is added less than 3 parts by weight, the viscosity and molecular weight of the acrylic resin composition increases, resulting in poor spray workability, and when added in excess of 10 parts by weight, the coating film properties due to excessive molecular weight decrease. The problem arises that it leads to degradation.

As the compound which can be added as the radical initiator, benzoyl peroxide, tertiary butyl peroxy benzoate, tertiary butyl peroxy-2-ethyl hexanoate, tertiary mil peroxy-2-ethyl hexanoate, etc. may be used. The radically polymerizable initiator which is such an organic peroxide can be used individually or in mixture of 2 or more types.

Methacrylic monomer having an aliphatic group having a composition ratio as described above, Methacrylic monomer having a hydroxyl group, Acrylic or methacrylic functional monomer, Methacrylic monomer containing a metal component, Silicone monomer, Chain transfer agent containing a hydroxyl group And an initiator is added dropwise to the middle boiling point solvent for 6 hours to 8 hours, and then polymerized at a temperature of 110 ° C to 150 ° C for 8 hours to 11 hours.

As the solvent usable above, aromatic hydrocarbons such as toluene and xylene, esters such as normal butyl acetate and ethylene glycol ethyl ether acetate, and ketones such as methyl isobutyl ketone and methyl normal amyl ketone can be used. Solvent can be used alone or mixed in consideration of the effect on the molecular weight and final viscosity of the resin alone, or the solvent has a boiling point of 100 to 160 ℃ in consideration of the synthesis temperature of the resin, solubility parameter, evaporation rate, etc. It is preferable to synthesize | combine in 110-150 degreeC using.

As described above, the mixed solution containing the monomers and the initiator and the chain transfer agent is added dropwise to the middle boiling solution in the reactor at a uniform rate for 6 to 8 hours, and then polymerized for 8 to 11 hours at a temperature of 110 to 150 ° C. .

The reason why the dropping time is lengthened as described above is to prevent the reflux of the middle boiling point solvent which can generally be caused upon dropping of the monomer mixture in the conventional acrylic resin synthesis.

As described above, when the reaction conditions are stably induced, the monomer composition ratio and the functional group distribution are uniform, and the chain transfer agent having the functional group is attached to the terminal of the molecular structure so that the molecular weight of the resin is linear when the coating film is formed through crosslinking with the crosslinking agent resin. By polymerizing in the direction, it is possible to obtain a high solid acrylic resin composition that ultimately exhibits excellent gloss and hardness, and also provides excellent performance in chemical properties.

In the course of the reaction, a reaction catalyst may be used to modify and polymerize a hydrophilic silicone material in a hydroxyl group-containing acrylic resin, and as a usable reaction catalyst, an organic titanate may be used, such as an alkyl titanate, an organic tin compound, and an alkali catalyst. The addition amount is preferably 0.01 parts by weight to 0.1 parts by weight with respect to 100 parts by weight of the total reactant, and particularly preferably 0.02 parts by weight to 0.06 parts by weight.

When the high solid acrylic resin composition is prepared by the above method, the number average molecular weight (Mn) of the resin composition is 2000 to 5000, the glass transition temperature is 30 ° C to 70 ° C, the viscosity is 1200 cP to 2000 cP, and the acid value is 5 mgKOH /. It is possible to prepare an acrylic resin composition having a range of g to 30 mgKOH / g, a hydroxyl content of 2% to 6%, and a nonvolatile content of 75% or more.

In addition, the present invention can be used in the production of a general paint composition of the high-solid acrylic resin composition having the above composition, in particular 60 to 90 parts by weight of the high-solid acrylic resin composition having a composition of the present invention and a low viscosity non-denatured aliphatic poly Provided is a paint containing a high solid acrylic resin composition comprising 10 parts by weight to 40 parts by weight of an isocyanate resin composition.

The paint having the above range has a solid content concentration of 60% and a viscosity of 16 to 20 seconds (Zahn # 2). In general, a paint has a volatile solvent to have a viscosity of 16 to 20 seconds (Zahn # 2). Although it was necessary to adjust the solid content concentration to 50% by adding a large amount, the present invention has the advantage that the viscosity is 16 to 20 seconds (Zahn # 2) even when the solid content concentration is adjusted to 60% by using less volatile solvent.

Hereinafter, the present invention will be described in detail with reference to the following examples and comparative examples, but the present invention is not limited to the following examples.

<Example 1>

After putting 129.9 g of normal butyl acetate as a solvent in a four-necked flask equipped with a stirrer, replacing with nitrogen gas and raising the temperature to 130 ° C. while stirring and maintaining a constant, normal butyl as a methacryl monomer having an aliphatic group in the solvent. 114.0 g of methacrylate and 173.0 g of methyl methacrylate, 55.0 g of 2-hydroxyethyl methacrylate as a methacrylate monomer having a hydroxyl group, and acetacetoxy ethyl meth as an acrylic or methacryl functional monomer having a higher alkyl group. The methacrylate was added while changing to the weight shown in Table 1 below, 6.0 g of titanium methacrylate as a methacryl-based monomer containing a metal component, 16 g of 2-mercaptoethanol as a chain transfer agent containing a hydroxyl group, and a tertiary as an initiator. The mixture which mixed 16 g of amyl peroxy-2-ethyl hesanoate was dripped at the uniform speed over 4 hours, and dripping was completed. The reaction temperature was raised to 140 ° C. and further aged for 2 hours. Then, 4 g of tertiary-milperoxy-2-ethylhexanoate was added thereto, followed by further stirring for 2 hours to react the unreacted monomer, followed by tetraethyl esterification catalyst. 0.3 g of isopropyl titanate and 12.0 g of ethyl silicate were added to the silicone monomer, followed by reaction at the same temperature for 3 hours to complete the reaction, thereby preparing a high solid acrylic resin composition.

After mixing 109 g of the acrylic resin composition prepared above and 36 g of an aliphatic non-denatured polyisocyanate (NCO = 23%), 55 g of a diluting solvent composed of butyl acetate, xylene, and the like are added to allow for air spraying. The viscosity was adjusted to 20 seconds (Zahn cup # 2) to prepare a paint containing a high solid acrylic resin composition.

<Example 2>

40.0 g of acetoacetoxyethyl methacrylate and a methacryl-based monomer containing a metal component as an acryl or methacryl-based functional monomer having a higher alkyl group were added while changing titanium methacrylate to the weight shown in Table 1 below. A high solid acrylic resin composition and a paint containing the composition were prepared in the same manner as in Example 1.

<Example 3>

Example 1 except adding 40.0 g of acetoacetoxyethyl methacrylate as an acrylic or methacrylic functional monomer having a higher alkyl group, and changing the ethyl silicate to the weight shown in Table 1 below with a silicone monomer. In the same manner as in the high solid acrylic resin composition and a coating containing the composition was prepared.

Comparative Example 1

A paint containing a high-solid acrylic resin composition was prepared in the same manner as in Example 1 except that no acrylic or methacrylic functional monomer, a methacrylic monomer containing a metal component, and a silicone monomer were not added. .

Experimental Example

In order to evaluate the coating properties of the paint containing the prepared high-solid acrylic resin composition, first, the polishing paper # 220 was polished on a thin plate, and then the surface washer was spray-coated to a dry coating thickness of 50 μm, and then dried. After polishing with # 600, the base coat white coating was spray-coated to a film thickness of 25 μm and dried, and then the paint containing the high solid acrylic resin composition prepared in Example 1 was spray-coated to a dry film thickness of 50 μm. It was naturally dried for 7 days and subjected to the physical property evaluation of the coating film as shown in Table 1 below.

-60 ^o Mirror Polish-

60 ^o mirror gloss is a 60 ^o mirror gloss test method of the paint of KS M 5000-3312, and the glossiness of the glass surface as a standard plate is measured by measuring the reflectance when the incident angle and the horizontal angle are 60 ^o with a gloss meter. The average value measured 5 times was expressed as a percentage when 100 was taken.

-Adhesive Test-

Adhesion test is carried out by drawing 11 lines horizontally and vertically on the specimen so that the gap is 1mm according to ISO 2409 paint test method, and attaching cellophane adhesive tape on it and detaching it. Adhesion was evaluated by the number of pieces remaining.

-Pencil hardness-

Pencil hardness was drawn at 45 ^o angles by pencil type (B, HB, F, H, 2H, 3H, 4H, etc.) on the coating film dried using the pencil hardness tester according to JIS K-5400. The degree of scratches at the time was visually determined.

-Accelerating pollution-

Accelerated fouling was evaluated by lightness index difference after spraying the carbon black dispersed in water and solvent on the specimen, drying and curing at 60 ° C for 1 hour, followed by water washing experiment. The larger the brightness index aberration, the greater the pollution, and the smaller the brightness index, the lower the pollution.

-Scratch resistance-

The scratch resistance was evaluated by gloss preservation value after mixing the sand of the size of 90㎛ to 150㎛ in a glue solution and dropping 2-3 drops to the specimen, rubbed 20 times using a 200g vibrator.

-Accelerated weather resistance-

Accelerated weatherability was evaluated by the gloss preservation value after 1000 hours using sunshine weather-meter according to the KS M 5000-3231 paint accelerated weathering test method.

-Sunyoung Sung-

Sensitivity was measured using the vertical and horizontal planes using portable gloss distinctiveness (PGD).

division Addition amount of acetoacetoxyethyl methacrylate (g) Addition amount of titanium methacrylate (g) Addition amount of ethyl silicate (g) 60 ° mirror gloss Adhesive Pencil hardness Accelerated pollution Scratch resistance Weathering resistance Sunyoung Sung level Perpendicular Example 1 10.0 6.0 12.0 95 99 4H -3.1 35 91 0.91 0.70 40.0 6.0 12.0 95 100 4H -3.0 49 92 0.94 0.71 200 6.0 12.0 94 100 3H -3.2 50 91 0.92 0.72 400 6.0 12.0 93 100 3H -3.5 52 93 0.90 0.70 500 6.0 12.0 92 100 H -3.8 51 92 0.87 0.68 Example 2 40.0 2.0 12.0 95 98 2H -3.1 48 92 0.93 0.72 40.0 50 12.0 93 100 3H -3.3 50 91 0.92 0.71 40.0 100 12.0 94 100 4H -3.4 51 92 0.91 0.72 40.0 150 12.0 90 98 4H -3.2 45 90 0.88 0.52 Example 3 40.0 6.0 2.0 96 100 3H -5.5 45 93 0.93 0.72 40.0 6.0 50 95 100 3H -3.5 48 92 0.92 0.71 40.0 6.0 100 93 100 4H -3.0 50 91 0.91 0.70 40.0 6.0 150 90 99 4H -2.8 50 89 0.86 0.48 Comparative Example 1 0 0 0 94 98 2H -7.5 32 88 0.81 0.42

As shown in Table 1, scratch resistance is greatly reduced when 10 g is added so as to be less than 5 parts by weight, which is the range of the present invention in Example 1 while changing the amount of acetoacetoxyethyl methacrylate having a higher alkyl group. It can be confirmed that, if added to 40g, 200g, 400g to 5 to 50 parts by weight within the scope of the present invention gloss, adhesiveness, pencil hardness, accelerated contamination, scratch resistance, accelerated weathering and sunscreen It can be confirmed that both excellent, when the addition of 500g to exceed 50 parts by weight of the scope of the present invention can be confirmed that the pencil hardness is greatly reduced.

In addition, when the addition of 2g to less than 1 part by weight of the range of the present invention in Example 2 while changing the amount of addition of titanium methacrylate to the methacryl-based monomer containing a metal component confirmed that the adhesiveness and pencil hardness is low In the case of adding 12g, 50g, 100g to 1 to 20 parts by weight within the scope of the present invention, it is excellent in gloss, adhesiveness, pencil hardness, accelerated contamination, scratch resistance, accelerated weatherability and sunscreen It can be confirmed, and when added to 150 parts by weight to exceed 20 parts by weight of the scope of the present invention can be confirmed that the gloss and adhesiveness is reduced.

In addition, when less than 1 part by weight of the range of the present invention was added 2g in Example 3 carried out while varying the amount of ethyl silicate added to the silicone monomer, it was found that the contamination is large, 1 to 20 parts by weight within the scope of the present invention If 12g, 50g, 100g is added to the weight part, it can be confirmed that all of the glossiness, adhesiveness, pencil hardness, accelerated contamination resistance, scratch resistance, accelerated weather resistance, and sunscreen are excellent, and exceed 20 parts by weight of the scope of the present invention. When 150 parts by weight is added, it can be seen that the selectivity is lowered.

In addition, in Examples 1 to 3, all of the cases added within the scope of the present invention, acetoacetoxyethyl methacrylate having a higher alkyl group, a methacryl-based monomer containing a metal component, and a comparative example without adding a silicone monomer More adhesive, pencil hardness, accelerated fouling resistance, scratch resistance, accelerated weathering resistance and good screening all can be confirmed through Table 1 above.

As described above, the present invention expresses high elasticity and high durability, expresses elastic regions of the coating film and expresses great breakage energy, thereby providing excellent scratch resistance, and improving stain resistance, adhesion and surface hardness, and the like. It is a useful invention to provide a high-solid acrylic resin composition and a coating containing the composition, which are excellent in water resistance, weather resistance, and sensibility while imparting non-polluting properties while maintaining hydrophilicity.

In particular, the high-solid acrylic resin composition of the present invention has a low molecular weight and a special molecular structure with a low solids VOC content compared to the conventional hydroxyl group-containing acrylic resin, so that the impact resistance, flex resistance and the like by crosslinking reaction with isocyanate It has excellent chemical properties such as mechanical properties, water resistance and solvent resistance, and forms a coating film with excellent appearance quality, gloss and hardness, so that it is applied to automotive topcoat and automotive repair topcoat. In view of the low pollution is a useful invention.

Claims (10)

In the high solid acrylic resin composition comprising a methacryl-based monomer, a chain transfer agent and an initiator, the methacryl-based monomer is 50 parts by weight to 80 parts by weight of a methacryl monomer having an aliphatic group, 10 parts by weight of a methacryl monomer having a hydroxyl group Parts to 40 parts by weight, 5 parts by weight to 50 parts by weight of an acrylic or methacrylic functional monomer having a higher alkyl group, 1 part to 20 parts by weight of a methacrylic monomer containing a metal component, a chain transfer agent including a hydroxyl group 2 A high solid acrylic resin composition comprising 1 part by weight to 20 parts by weight of a silicone monomer, consisting of parts by weight to 8 parts by weight and an initiator 3 parts by weight to 9 parts by weight. 2. The high solid acrylic resin according to claim 1, wherein the acrylic or methacrylic functional monomer having a higher alkyl group is an acetoacetoxyethyl methacrylate having an acetoacetyl group and an ε -caprolactone acrylate monomer having a hydroxyl group. Composition. The methacryl-based monomer containing a metal component reacts with a fatty acid having 8 to 12 carbon atoms to an alkyl titanate such as isopropyl titanate, tetranormal butyl titanate and tetrakis-2-ethylhexyl titanate. The high-solid acrylic resin composition characterized in that the titanium methacrylate synthesized by modifying the methacrylic acid here after. 2. The high solid acrylic according to claim 1, wherein the silicone monomer is a silicate having an alkoxy group or a hydroxy group such as ethyl silicate or tetrakis-2-ethyl orthosilicate and an alkyl alkoxysilane compound such as methyl methoxysilane. Resin composition. 50 parts by weight to 80 parts by weight of a methacryl monomer having an aliphatic group, 10 parts to 40 parts by weight of a methacryl monomer having a hydroxyl group, 5 parts to 50 parts by weight of an acrylic or methacrylic functional monomer, and a metal component 1 to 20 parts by weight of the methacryl-based monomer, 1 to 20 parts by weight of the silicone monomer, and 2 to 8 parts by weight of the chain transfer agent including a hydroxyl group, and 3 to 9 parts by weight of the initiator in 6 medium boiling point solvent Method for producing a high solid acrylic resin composition characterized in that the polymerization for 8 hours to 11 hours at a temperature of 110 ℃ to 150 ℃ while dropping for 8 hours. 6. The high-solid acryl according to claim 5, wherein acetoacetoxyethyl methacrylate having an acetoacetoxy group and an epsilon -caprolactone acrylate monomer are used as the acrylic or methacrylic functional monomer having a higher alkyl group. Method for producing a resin composition. A fatty acid having 8 to 12 carbon atoms is reacted with an alkyl titanate such as isopropyl titanate, tetranormal butyl titanate, tetrakis-2-ethylhexyl titanate, etc. as a methacryl monomer containing a metal component. Method of producing a high-solid acrylic resin composition characterized in that by using the modification of methacrylic acid and then self-synthesized titanium methacrylate. The method of claim 5, wherein the silicone monomer is a silicate having an alkoxy group or a hydroxyl group, such as ethyl silicate, tetrakis-2-ethyl orthosilicate, and an alkylalkoxysilane compound such as methylmethoxysilane. Method for producing a solid acrylic resin composition. The organic titanate is a catalyst of alkyl titanate, organic tin compound, alkali and the like with respect to 100 parts by weight of the total reactants according to any one of claims 5 to 8 in order to modify and polymerize a hydrophilic silicone material to a hydroxyl group-containing acrylic resin. Method for producing a high solid acrylic resin composition, characterized in that the addition of 0.01 parts by weight to 0.1 parts by weight. 60 to 90 parts by weight of the high solid acrylic resin composition according to any one of claims 1 to 4, and 10 to 40 parts by weight of the low viscosity non-denatured aliphatic polyisocyanate resin composition, the solid content of 60%, viscosity of 16 seconds to A paint containing a high solid acrylic resin composition, having 20 seconds (Zahn # 2).