KR20170085866A - One-component type matt solvent paint composition for automotive top coating - Google Patents

Abstract

The present invention relates to an oily matt one-pack coating composition for topical application, and a molded article coated with the oily matt one-pack coating composition for topical application.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a one-

The present invention relates to an oily matt one-pack coating composition for topical application, and a molded article coated with the oily matt one-pack coating composition for topical application.

In modern society, people's desire to make their own possessions has become more and more satisfactory as the human life has become more enriched with the progress of industrialization. However, with the industrialization, as everyone owns the same shape and color of products, the satisfaction level tends to decrease and others want something new. People who purchase vehicles have also come to demand vehicles with different colors and textures that are not conventional colors such as silver, white, and black, which are much more conventional.

In response to such consumer demands, the company has painted paints that show a matte texture on automobiles at home and abroad. In addition, automakers such as Mercedes, BMW, and Hyundai are also selling matt cars.

Conventional lustrous paints generally have a luster of 60 ° to 80% or more after coating, and matt paints of 60 ° to 40% or less. The matte coating has a matte effect by roughening the surface after coating to cause irregular reflection of light. Here, a small amount of a light-quenching agent made of silica (SiO ₂ ) is used to roughen the surface. The roughness of the coating surface varies depending on the content and the size of the silica particles contained in the matte coating, and the effect of lowering the gloss of the coating is different. Usually, the content of silica particles in matte coatings is 5% or more based on the total coating composition, which particles precipitate in the paint and cause aggregation. Such a phenomenon occurs when the paint is unevenly coated on the surface to form a dirt, and the gloss is not uniformly applied, resulting in unevenness, resulting in appearance quality defects. Also, the particles in the paint pipe are hardened and clogged. These problems increase the cost of production when repainting is required, while also increasing maintenance costs due to clogging of paint piping and sprayer.

A lot of studies have been made to solve all of these problems. For example, Korean Unexamined Patent Publication No. 2013-0013232 discloses a matt coating composition for automobiles containing silica and talc as a quencher, It is required to develop matt paint for automobile tops which is improved in agglomeration phenomenon.

SUMMARY OF THE INVENTION The present invention has been made to solve the problems of the prior art as described above, and it is an object of the present invention to provide a glossy, lightweight, one-pack coating composition for phase inversion which solves the problem of precipitation and aggregation of a silica quencher represented by a conventional oily matt coating, The technical problem is to provide.

The oily matte one-pack coating composition for topical use of the present invention comprises 15 to 60% by weight of a silane acrylic resin, 1 to 30% by weight of an acrylic polyol resin, 3 to 20% by weight of a melamine curing agent, To 50% by weight.

The coating composition of the present invention has the effect of reducing the production cost caused by defective appearance quality by solving the extinction agent aggregation and sedimentation phenomenon appearing in the conventional oily matt coating material. In addition, it is possible to improve the productivity of the coating material by reducing the maintenance cost of the coating equipment and increasing the use time of the coating material.

At the same time, since it can exhibit physical properties equivalent to those of conventional phase oil-based non-matt one-pack type paints, it is particularly suitable as a one-pack type clear coat for automobiles.

Hereinafter, the present invention will be described in more detail.

The present invention is characterized in that it comprises 15 to 60% by weight of a silane acrylic resin, 1 to 30% by weight of an acrylic polyol resin, 3 to 20% by weight of a melamine curing agent, and 30 to 50% by weight of a light extinguishing agent paste, To provide an oily, non-matt one-part coating composition for phase inversion.

For example, the silane acrylic resin may have a solid content of 40 to 80% by weight and a hydroxyl value of 30 to 200 mg KOH / g based on the solid weight, but it is not limited thereto. The silane acrylic resin may be prepared by polymerizing an ethylenically unsaturated monomer and an alkoxysilane compound as a monomer component in the presence of a conventional initiator in a solvent used for the production of a general acrylic resin.

The ethylenically unsaturated monomer may be selected from the group consisting of styrene, methyl (meth) acrylate, propyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, tertiary butyl (Meth) acrylate, benzyl (meth) acrylate, isobornyl (meth) acrylate, lauryl (meth) acrylate, and combinations thereof.

Although not particularly limited, the alkoxysilane compound is an alkoxysilane group in which one or more vinyl groups, acrylic groups, and methacrylic groups are substituted, and the alkoxysilane compound includes vinyltrimethoxysilane, vinyltriethoxysilane, vinylbutyltriethoxysilane , Vinyltri (beta-methoxy) silane, vinyltri (beta-ethoxy) silane, acryloxypropyltrimethoxysilane, acryloxypropyltriethoxysilane, acryloxypropylmethyldimethoxysilane, gamma-methacryloxy Methacryloxypropylmethyldimethoxysilane, and gamma-methacryloxypropylmethyldiisopropoxysilane, gamma-glycidyloxypropyltriazine, gamma-glycidyloxypropyltrimethoxysilane, gamma-methacryloxypropyltrimethoxysilane, Methoxysilane, and gamma-glycidyloxypropyltriethoxysilane, and combinations thereof.

Although not specifically limited, the hydroxyl-containing monomers include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, hydroxybutyl (meth) acrylate, allyl alcohol and methacryloyl And combinations thereof.

The silane acrylic resin as the main resin component of the oil phase matt one-pack coating composition for topical use of the present invention is cured with melamine to form a coating film of non-matt clear, gives the physical and chemical performance of the coating film, It plays a role of improving scratch resistance and acid resistance. The silane acrylic resin may be included in an amount of 15 to 60% by weight based on the total weight of the composition. If the amount of the silane acrylic resin in the coating composition is less than 15% by weight, the mechanical properties of the coating may deteriorate. If the amount exceeds 60% by weight, the workability is poor and the appearance is deteriorated.

The phase one-component oily matt coating composition of the present invention comprises an acrylic polyol resin as an auxiliary resin component. The acrylic polyol resin may be prepared by polymerizing 10 to 80 parts by weight of a lactone-modified acrylate oligomer, 10 to 80 parts by weight of an ethylenically unsaturated monomer, and 0.1 to 15 parts by weight of an initiator based on 100 parts by weight of a monomer in a resin, The acrylate oligomer is subjected to cyclic ring polymerization using 1 to 5.5 mol of a lactone compound having a cyclic carbon atom of 4 to 8 carbon atoms per mol of the ethylenically unsaturated monomer containing a hydroxyl group to obtain a lactone-derived aliphatic linear structure and a polyfunctional Of a hydroxyl group.

The lactone-modified acrylate oligomer is obtained by reacting a lactone compound, which is a heterocyclic compound containing -COO- in a molecule, with an acrylate monomer containing a hydroxy group to carry out ring-opening polymerization to bond the polymerizable double bond and the hydroxy group And the carbon structure in which the chain element has a single bond is repeated.

The lactone compound is not particularly limited as long as it can impart a lactone-derived aliphatic linear structure and a polyfunctional hydroxyl group to the lactone-modified acrylate oligomer of the present invention, but is not limited to ε-caprolactone, β-methyl- Lactone,? -Caprolactone,? -Caprolactone,? -Butyrolactone, and combinations thereof.

As described above, the ring-opening polymerization can be carried out using the lactone compound. In this case, a catalyst for ring-opening polymerization can be further included. The catalyst may be used in an amount of up to 1000 ppm based on the total weight of the lactone-modified acrylate oligomer. The catalyst is not particularly limited as long as it can be used as a catalyst in the ring-opening polymerization, and tin compounds, organic lead or manganese compounds are preferable, and specific examples include tetraphenyl tin, tetraoctyl tin, diphenyl tin laurate, dimethyl tin Oxide, dibutyltin oxide, lead acetate or magnesium acetate.

In order to polymerize the lactone-modified acrylate of the present invention, 1 to 5.5 mol of a lactone compound having a ring carbon atom of 4 to 8 carbon atoms can be used per 1 mol of the ethylenically unsaturated monomer containing a hydroxyl group. Specifically, when less than 1 mole of the lactone compound is used, a large amount of residual hydroxy groups may remain to participate in the curing reaction. If it exceeds 5.5 moles, hardness may be lowered because there are few sites capable of curing reaction with the curing agent , Moisture resistance, weather resistance, chemical resistance, and the like.

In order to polymerize the acrylic polyol resin of the present invention, the polymerized lactone modified acrylate oligomer may be used in an amount of 10 to 80 parts by weight based on 100 parts by weight of the monomer in the resin. When the amount is less than 10 parts by weight, a desired effect can not be expected. When the amount is more than 80 parts by weight, hardness is lowered due to few sites capable of undergoing a curing reaction with the curing agent, which can lower the moisture resistance, weather resistance, It is not preferable.

The acrylic polyol resin used in the present invention is not particularly limited, but it may have a weight average molecular weight of 5,000 to 30,000, a resin solid content of 40 to 90% by weight, and a hydroxyl value of 80 to 200 mg KOH / g on the basis of the solid content .

In order to polymerize the acrylic polyol resin of the present invention, 10 to 80 parts by weight of the ethylenically unsaturated monomer may be used based on 100 parts by weight of the monomer in the resin. When the amount of the ethylenically unsaturated monomer is less than 10 parts by weight, the content of the lactone-modified acrylate oligomer is excessively large, and excessive use of the curing agent and the curing catalyst is inevitable, so that it may be difficult to secure mechanical properties. On the other hand, if the amount of the ethylenically unsaturated monomer exceeds 80 parts by weight, it is difficult to exert the effect of improving the reactivity of the resin, which is not preferable.

The ethylenically unsaturated monomer may be selected from the group consisting of styrene, methyl (meth) acrylate, propyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, tertiary butyl (Meth) acrylate, benzyl (meth) acrylate, isobonyl (meth) acrylate, lauryl (meth) acrylate, and combinations thereof.

An initiator may be used to polymerize the acrylic polyol resin of the present invention, and the initiator may be used in an amount of 0.1 to 15 parts by weight based on 100 parts by weight of the monomer in the resin.

The initiator is not particularly limited as long as it can initiate a chain reaction. Examples of the initiator include 2,2 'azobis (2-methylbutylonitrile), 2,2' azobisisobutylonitrile, dibenzoyl peroxide, Peroxy benzoate, ditertiary butyl peroxide, tertiary butyl peroxy-2-ethyl hexanoate, tertiary butyl peroxyacetate, tertiary amyl peroxy-2-ethyl hexanoate, ditertiary amyl peroxide, Cumyl hydroperoxide, dicumyl peroxide, and combinations thereof.

In addition, a chain transfer agent may be further included for controlling the molecular weight, and the chain transfer agent may be contained in an amount of 10 parts by weight or less based on the total weight. Examples of the chain transfer agent include lauryl mercaptan, glycidyl mercaptan, mercaptoacetic acid, 2-mercaptoethanol, thioglycolic acid, 2-ethylhexyl thioglycolate, 2,3-dimercapto- Phenol, and the like, or combinations thereof.

The solvent which can be used for polymerizing the acrylic polyol resin of the present invention is not particularly limited so long as it does not adversely affect the reaction, and examples thereof include aromatic hydrocarbon solvents such as toluene and xylene; Ketone solvents such as methyl ethyl ketone, methyl propyl ketone, methyl butyl ketone and ethyl propyl ketone; Ester solvents such as methyl acetate, ethyl acetate, n-propyl acetate, isopropyl acetate, isopropyl, butyl acetate and butyl cellosolve acetate; And combinations thereof. Preferably, the solvent may be used in an amount of 10 to 60 parts by weight based on 100 parts by weight of the ethylenically unsaturated monomer.

The acrylic polyol resin used in the oil-based non-matt one-pack coating composition for topical use of the present invention undergoes a curing reaction with melamine and has a hydroxyl value (OHV) higher than that of the silane acrylic resin, thereby improving the degree of crosslinking and improving the water resistance, moisture resistance, And may include 1 to 30% by weight based on the total weight of the composition.

If the acrylic polyol resin is less than 1% by weight or more than 30% by weight based on the total weight of the composition, physical properties such as mechanical properties, moisture resistance, weather resistance, chemical resistance, manufacturing and coating performance may be deteriorated.

The oily matt one-pack coating composition for topical use of the present invention comprises a melamine curing agent. The melamine curing agent forms a coating film with a curing agent which reacts with a silane acrylic resin and an acrylic polyol resin to give a physical and chemical performance of the coating film. The melamine curing agent is selected from the group consisting of hexamethylol melamine, hexamethoxymethylmelamine, hexabutoxy Methyl melamine, and combinations thereof. If the melamine curing agent is used in an amount of less than 3 wt% or more than 20 wt% based on the weight of the entire coating composition, the mechanical properties of the coating may be deteriorated.

The oily matt one-pack coating composition for topical use of the present invention may contain 30 to 50% by weight of the antistatic agent paste based on the weight of the total composition.

The light extinguishing agent paste included in the oil phase non-matt one-pack coating composition for phase in the present invention may include, but is not limited to, silica particles, a solvent and an anti-settling agent.

The light extinguishing agent paste contains 7.5 to 23.5% by weight of silica particles based on 100% by weight of the light extinguishing agent paste; And the anti-settling agent may include, but not limited to, 5 to 20 wt%.

The silica particles included in the light extinguishing agent paste of the present oil-based non-matt one-pack coating composition may have an average oil absorption of 3 to 15 μm and an oil absorption of 100 to 350 g / 100 g, .

The quencher paste to be contained in the oily matt one-pack coating composition for phase transfer of the present invention may contain at least one solvent selected from the group consisting of aromatic hydrocarbon solvents, alcohol solvents, ester solvents and combinations thereof, But the present invention is not limited thereto.

If the light extinguishing agent paste is less than 30% by weight based on the weight of the entire coating composition, the effect of the matting may not be sufficient in the oil-based coating, and if it exceeds 50% by weight, the mechanical properties, workability and appearance may be deteriorated have. Particularly, the light extinguishing agent paste is prepared by dispersing silica particles as a quencher in a solvent, thereby effectively solving the problem of aggregation and sedimentation of the quencher.

Since the silica particles of the oil-based non-matt one-pack coating composition for phase development tend to cause lumps and sedimentation phenomena, anti-settling agents are used as one of the methods for preventing this. The anti-settling agent is characterized by having a steric structure of polyamide and oxidized polyethylene, and structurally prevents sedimentation of silica particles because the steric structure is in the form of chain or cotton. The anti-settling agent may be included in an amount of 5 to 20% by weight based on 100% by weight of the light extinguishing agent paste. When the anti-settling agent is contained in an amount of less than 5% by weight based on 100% by weight of the light extinguishing agent paste, May occur, and if it exceeds 20% by weight, the mechanical properties may be deteriorated.

The present oil-based non-matt one-pack coating composition may further include at least one selected from the group consisting of a pinhole inhibitor, a surface conditioner, a light stabilizer, an acid catalyst and combinations thereof, but the present invention is not limited thereto.

In addition to the above components, the oil-based non-matt one-pack coating composition for topical use of the present invention may contain a solvent. The type of the solvent is not particularly limited and includes, for example, aromatic hydrocarbon solvents such as toluene xylene; Ketone solvents such as methyl ethyl ketone, methyl propyl ketone and methyl butyl ketone; Ester solvents such as methyl acetate, ethyl acetate, n-propyl acetate, isopropyl acetate, isopropyl, butyl acetate and butyl cellosolve acetate; And combinations thereof. However, the present invention is not limited thereto. The content of the solvent in the coating composition is not particularly limited, and can be selected by a person skilled in the art.

The present invention can provide a molded article coated with the oily matt one-pack coating composition for topical application. For example, the molded article may be a metal or a non-metallic material, and may be, for example, an automobile part.

The oil-based non-matt one-pack coating composition for topical use of the present invention solves the problem of aggregation and sedimentation of a quencher generated in a conventional oily matt one-pack coating, thereby reducing the cost incurred due to poor appearance quality and reducing the maintenance cost of coating equipment And the productivity of the paint was improved by increasing the use period of the paint.

The oily matt one-pack coating for topical use of the present invention further comprises a light stabilizer, a surface conditioner, a light stabilizer, and / or a defoaming agent in addition to silane acrylic resin, acrylic polyol auxiliary resin, melamine curing agent, quencher, The physical properties of the coating film such as storage stability, adhesion, water resistance, impact resistance, and chipping resistance can be improved.

Hereinafter, the present invention will be described more specifically by way of examples. However, these examples are provided only for the understanding of the present invention, and the scope of the present invention is not limited to these examples in any sense.

[Example]

The components used in the examples illustrated below were each carried out using the following components, except as specifically illustrated:

Silane acrylic resin: a silane acrylic resin having a solid content of 40 to 80% by weight and a hydroxyl value of 30 to 200 mg KOH / g on a solid weight basis

Acrylic polyol resin having an average molecular weight of 5,000 to 30,000, a resin solid content of 40 to 90% by weight, an acryl polyol resin having a hydroxyl value of 80 to 200 mg KOH / g on a solid weight basis

Melamine curing agent: a melamine curing resin selected from hexamethylol melamine, hexamethoxymethyl melamine, hexamethoxymethyl melamine and combinations thereof (Cymel 1130, Cymel 1133, Cymel 1161, Cymel 1168, Cymel 1171, and Cymel 718 from INNOS)

Anti-settling agent: Solvesso 100 / Ethanol / IPA The solid content in the solvent is 5 to 50% by weight, for example 7% by weight, and is composed of fatty acid polyamide wax and oxidized polyethylene. (6900, NS-5500, F-9050, KUSUMOTO Co., Ltd.) which is a slightly yellowish white high viscosity fluid.

Production Example 1: Extinguishing Agent Paste 1

131 g of an aromatic hydrocarbon solvent, 98 g of an alcohol and 240 g of an ester solvent were added to 75 g of a silica particle having a solid content of 100% by weight and a diameter of 7 m and an oil absorption of 320, 60 g of an anti-settling agent having a three-dimensional structure of amide and oxidized polyethylene was added and mixed with stirring at 2000 rpm for 20 minutes to prepare a light-quenching agent paste 1.

Production Example 2: Extinguishing agent paste 2

126 g of the aromatic hydrocarbon solvent, 94 g of the alcohol and 229 g of the ester solvent were added to 95 g of the silica particles having a solid content of 100% by weight and a diameter of 7 탆 and an oil absorption of 290, with a solid content of 5 to 50% 60 g of an anti-settling agent having a three-dimensional structure of amide and oxidized polyethylene was added thereto, followed by stirring at 2000 rpm for 20 minutes or more to prepare a light-quenching agent paste 2.

Production Example 3: Extinguishing agent paste 3

126 g of the aromatic hydrocarbon solvent, 94 g of the alcohol and 229 g of the ester solvent were added to 90 g of the silica particles having a solid content of 100% by weight, a diameter of 9 m and an oil absorption of 290, 60 g of an anti-settling agent having a three-dimensional structure of amide and oxidized polyethylene was added thereto, and the mixture was stirred at 2000 rpm for 20 minutes or more to prepare a light extinguishing agent paste 3.

Comparative Preparation Example 1: Extinguishing agent paste 4

131 g of the aromatic hydrocarbon solvent, 98 g of the alcohol and 240 g of the ester solvent were mixed with 75 g of the silica particles having a solid content of 100% by weight, a diameter of 7 탆 and an oil absorption of 320, and a solid content of 80 to 100% 20 g of a dispersant having a modified polyether structure was added thereto, and the mixture was stirred at 2000 rpm for 20 minutes or more to prepare a quencher paste 4.

The coating compositions of Examples 1 to 3 and Comparative Examples 1 and 2 were each prepared by mixing with stirring at 1000 rpm for 20 minutes or more with the composition shown in Table 1 below. Specifically, Examples 1 to 3 were each prepared so as to contain the light extinguishing agent pastes 1 to 3 prepared according to Production Examples 1 to 3, and Comparative Example 1 was prepared to contain the light extinguishing agent paste 4 prepared according to Comparative Preparation Example 1 And Comparative Example 2 was prepared by containing the light extinguishing agent paste 1 in such a manner that the weight percentages of the silane acrylic resin and the acrylic polyol resin were different.

(10 to 20 탆) film thickness on a specimen coated with an automotive intermediate coating, coating the oily matte one-part paint for phase-inversion of the present invention on the base coating, drying it at room temperature for 10 minutes, Minute to cure the mixture to form a final coating film. The physical properties of the final coating film were tested under the following test methods and conditions, and the results are shown in Table 2.

Adhesion: Cross-cut 2 cm in width and 2 mm in thickness on dry film using Scotch tape and peel off using Scotch tape.

Water resistance: The coated specimens were immersed in a constant temperature water bath at 40 ° C for 240 hours and then left at room temperature for 1 hour, and then subjected to peel test by evaluation of sticky wood adhesion to visually observe the abnormality of appearance. The appearance after the test shall be free from softening, whitening, gloss defects, peeling, swelling, discoloration, etc., and there shall be no difference in appearance between the dipped and untreated parts.

Chipping resistance: The coated specimen is left at -20 ° C for 3 hours, then 50 g of chipping stone is pushed at a pressure of 5 bar by using 50 g of chipping stone to hit the surface of the film to measure the degree of damage. Should be.

Re-coatability: To evaluate adhesion performance when re-coating of paints, it should be evaluated with adhesion to re-painted specimens.

O / B Adhesion: When the paint is repainted, it shall be rated M-2.5 or higher to overestimate the coated specimen at 1 degree and to evaluate the adhesion performance at that time.

Solvent resistance: After putting the cotton cloth with the test solvent (XYLENE) on the specimen, scrape it 4 times with a force of 2 Kg with the fingernail every 1 minute to record the time of the lower layer film surface and the scratch should not occur within 5 minutes .

Scratch resistance: Completion of scratches caused by automatic car washes and mopping Measuring the resistance of the finished film, the gloss retention rate should be 55% or more.

Hardness: It should be good at B or higher by measuring hardness which does not damage the coating with each pencil of 3B, 2B, B, HB, F, H, 2H and 3H.

Flowability: Measures the limit film thickness that does not flow when the paint is applied to the vertical part.

Gloss stability: Gloss This is to measure the degree of change according to the change of the coating. The difference in gloss between 40 μm and 20 μm of the coating should be 5 or less.

Storage at room temperature: Evaluating the stability of the coating, the change in viscosity of the coating is checked after 3 months at 35 ° C, and the viscosity should not be more than twice as high as before the test

Thermal retention: It is to evaluate the stability of the coating. After 3 days at 60 ° C, the condition of the coating is checked. Precipitation and staining do not occur, and the viscosity is not more than twice as high as before the test.

As shown in Table 2, the coating compositions of Examples 1 to 3 of the present invention were superior to those of Comparative Examples 1 to 2 in properties such as room temperature storage stability, heat retention, flowability, adhesion, water resistance and gloss stability, And showed the same level of physical properties as the existing oil-based non-matt phase coating material.

Therefore, the use of the oil-based non-matt one-pack coating composition for screening of the present invention can solve the defective appearance caused by the aggregation of the light-extinguishing agent, thereby reducing the production cost due to re-coating, It is possible to reduce the maintenance cost due to failure such as clogging of coating equipment and equipment by the coating material and improve the stability of the coating material to improve the productivity in the case of the coating material and to improve the stability of the coating material, It is expected that it will be possible to reduce the manufacturing cost and to provide a coating material having similar and equivalent physical properties and workability while using the same system as the conventional oil-based glossy one-part paint.

Claims (5)

Based on the weight of the total coating composition,
15 to 60% by weight of silane acrylic resin;
1 to 30% by weight of an acrylic polyol resin;
3 to 20% by weight of a melamine curing agent; And
30 to 50% by weight of a light-
By weight, based on the total weight of the coating composition. The method according to claim 1,
Wherein the light extinguishing agent paste comprises silica particles, a solvent and an anti-settling agent. The method according to claim 2, wherein
The light extinguishing agent paste was prepared by mixing 100 parts by weight of a light-
The silica particles comprise 7.5 to 23.5% by weight; And
The anti-settling agent is 5 to 20% by weight;
Based coating composition for topical use. 3. The method of claim 2,
Wherein the silica particles have an average diameter of 3 to 15 占 퐉 and an oil absorption of 100 to 350 g / 100 g. 3. The method of claim 2,
Wherein the sedimentation inhibitor has a steric structure of polyamide and polyethylene oxide.