KR102156097B1 - A paint composition with fast drying rate - Google Patents

Abstract

The present invention relates to a paint composition having fast drying speed, low yellowing, and excellent abrasion resistance, adhesion, thermal stability, impact resistance and water resistance and, more specifically, to a paint composition comprising: an acrylic resin; titanium dioxide; calcium carbonate; a dispersant; hollow polystyrene particles; and a crack inhibitor. The paint composition has fast drying speed, low yellowing, and excellent abrasion resistance, adhesion, thermal stability, impact resistance, and water resistance. In addition, the paint composition is capable of improving abrasion resistance and retroreflective luminance by increasing adhesion power to asphalt, ascon, and glass beads.

Description

Coating composition with improved drying speed {A paint composition with fast drying rate}

The present invention relates to a coating composition having high drying speed, low yellowing, and excellent abrasion resistance, adhesiveness, thermal stability, impact resistance and water resistance, and more particularly, acrylic resin; Titanium dioxide; Calcium carbonate; Dispersant; Hollow polystyrene particles; And it relates to a coating composition comprising a crack inhibitor.

When a coating film made from a paint is exposed to ultraviolet rays or heat for a long period of time, the polymer chains constituting the coating film are crushed to deteriorate the characteristics of the coating film, and various contaminants may be generated during pulverization, causing environmental problems.

Meanwhile, as environmental regulations are strengthened, regulations on the release of volatile organic compounds are becoming stricter in the fields of paints, coatings and adhesives.

Therefore, even when exposed to ultraviolet rays or heat for a long period of time, the demand for water-soluble paints having a low content of volatile organic compounds and maintaining the properties of the coating film is increasing rapidly.

However, water-soluble paints have a disadvantage in that the drying speed is slower than that of solvent-type paints, so it takes a long time to construct, and there is a fatal disadvantage in terms of reliability due to deterioration of water resistance and abrasion resistance.

In this regard, Korean Patent Registration No. 10-1558876 discloses a water-soluble road surface coating composition comprising an acrylate or methacrylate repeating unit and comprising an acrylic resin, a colored pigment, and an extender pigment crosslinked by a curing agent. have.

However, the coating composition disclosed in the above document has a slow drying speed, and still has poor yellowness, abrasion resistance, adhesion, thermal stability, impact resistance, and water resistance.

Korean Patent Registration No. 10-1558876 (2015.10.02.)

An object of the present invention is to provide a coating composition having a high drying speed, low yellowing, abrasion resistance, adhesion, thermal stability, impact resistance and water resistance, as to solve the problems of the prior art.

Another object of the present invention is to provide a coating composition capable of improving wear resistance and retroreflective luminance by increasing adhesion to asphalt, ascon, and glass beads.

In order to achieve the above object, the present invention is an acrylic resin; Titanium dioxide; Calcium carbonate; Dispersant; Hollow polystyrene particles; And it provides a coating composition comprising a crack inhibitor.

In an embodiment of the present invention, based on 100 parts by weight of the acrylic resin, 3 to 100 parts by weight of titanium dioxide, 50 to 300 parts by weight of calcium carbonate, 0.1 to 5 parts by weight of dispersant, 0.5 to 30 parts by weight of hollow polystyrene particles, and cracks It characterized in that it contains 2 to 20 parts by weight of the inhibitor.

In one embodiment of the present invention, it is characterized in that it further comprises 1 to 10 parts by weight of a copolymer of an acrylate group-containing silane coupling agent and an acrylic acid monomer based on 100 parts by weight of the acrylic resin.

In one embodiment of the present invention, the crack inhibitor is characterized in that tripropylene glycol n-butyl ether or dipropylene glycol n-butyl ether.

In addition, the present invention is characterized in that in the product comprising the coating composition, the product is a paint, a coating agent or an adhesive.

The present invention can provide a coating composition having high drying speed, low yellowing, and excellent abrasion resistance, adhesiveness, thermal stability, impact resistance, and water resistance.

In addition, the present invention can provide a coating composition capable of improving abrasion resistance and retroreflective luminance by increasing adhesion with asphalt, ascon, and glass beads.

The present invention will be described in detail based on the following examples. The terms, examples, etc. used in the present invention are merely exemplified to describe the present invention in more detail and to aid understanding of those skilled in the art, and the scope of the present invention should not be interpreted as being limited thereto.

Technical terms and scientific terms used in the present invention represent the meanings commonly understood by those of ordinary skill in the art, unless otherwise defined.

The present invention is an acrylic resin; Titanium dioxide; Calcium carbonate; Dispersant; Hollow polystyrene particles; And it relates to a coating composition comprising a crack inhibitor.

The coating composition includes 3 to 100 parts by weight of titanium dioxide, 50 to 300 parts by weight of calcium carbonate, 0.1 to 5 parts by weight of dispersant, 0.5 to 30 parts by weight of polystyrene hollow particles, and 2 to 20 parts by weight of crack inhibitor based on 100 parts by weight of acrylic resin. Can include.

The acrylic resin functions to increase the surface hardness of the coating film and to impart adhesion to the substrate, abrasion resistance, impact resistance, water resistance and weather resistance.

The acrylic resin is not particularly limited as long as it is a polymer having an acrylic group in the molecule, and may be prepared by polymerizing an acrylic monomer or copolymerizing an acrylic monomer with another monomer.

In addition, the acrylic resin may be a solid acrylic resin or an acrylic resin emulsion may be used, and in this case, the content of the solid content contained in the acrylic resin emulsion is preferably 20 to 60% by weight.

The acrylic resin may be polymerized by emulsion polymerization, and may be an anionic acrylic resin to which anion is imparted. In order to prepare the anionic acrylic resin, an anionic surfactant or an anionic dispersant may be added during emulsion polymerization of the acrylic resin, or an anionic surfactant or anionic dispersant may be added after emulsion polymerization of the acrylic resin.

As the anionic surfactant or anionic dispersant, a sulfate; Sulfonate; phosphate; Salts of fatty acids rosine and naphthenic acid; Concentrated product of naphthalene sulfonic acid and low molecular weight formaldehyde; Metal alkyl sulfates such as sodium lauryl sulfate; Salts such as dodecylbenzene sulfonic acid and isopropylbenzene sulfonic acid; Salts of alkyl aryl sulfonic acids such as isopropylnaphthalene sulfonic acid; Salts of alkyl sulfosuccinic acid such as dioctyl sulfosuccinic acid, sulfosuccinic acid, octyl sulfosuccinic acid, N-methyl-N-palmitoyl tauric acid, and oleyl ethionic acid; Metal salts of alkylarylpolyethoxyethyl sulfuric acid such as sodium t-octylphenoxy-polyethoxyethyl sulfate, and the like may be used.

Acrylic monomers used in the preparation of the acrylic resin are methyl acrylate, ethyl acrylate, propyl acrylate, isopropyl acrylate, n-butyl acrylate, isobutyl acrylate, n-amyl acrylate, isoamyl acrylate, n-hexyl acrylate, 2-ethylhexyl acrylate, hydroxymethyl acrylate, 2-hydroxyethyl acrylate, hydroxypropyl acrylate, lauryl acrylate, methyl methacrylate, ethyl methacrylate, propyl meth Acrylate, isopropyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, n-amyl methacrylate, isoamyl methacrylate, n-hexyl methacrylate, 2-ethylhexyl methacrylate, Hydroxymethylmethacrylate, hydroxypropylmethacrylate, lauryl methacrylate, acrylic acid, methacrylic acid, methyl acrylic acid, ethyl acrylic acid, butyl acrylic acid, 2-ethyl hexyl acrylic acid, decylacrylic acid, methyl methacrylic acid, ethyl Methacrylic acid, butyl methacrylic acid, 2-ethyl hexyl methacrylic acid, decyl methacrylic acid, and the like.

The titanium dioxide may be used to improve whiteness and abrasion resistance.

The content of the titanium dioxide is preferably 3 to 100 parts by weight based on 100 parts by weight of the acrylic resin, and if the content is less than 3 parts by weight, whiteness and abrasion resistance decrease, and if it exceeds 100 parts by weight, the impact resistance of the coating film is rather reduced. The price rises a lot.

The titanium dioxide may be surface-treated with an acrylate group-containing silane coupling agent.

The acrylate group introduced on the surface of the titanium dioxide can improve the adhesive properties with the acrylic resin, thereby improving the durability, water resistance, and abrasion resistance of the composition.

The content of the silane coupling agent is preferably 1 to 10 parts by weight based on 100 parts by weight of titanium dioxide, so that the abrasion resistance of the composition may be maximized within the numerical range.

The calcium carbonate may be used to improve abrasion resistance and durability of the coating composition.

The content of calcium carbonate is preferably 50 to 300 parts by weight based on 100 parts by weight of the acrylic resin, and when the content is less than 50 parts by weight, abrasion resistance and durability are deteriorated, and when it exceeds 300 parts by weight, processability and impact resistance are deteriorated.

The dispersant is used to improve the dispersing properties of the composition and reduce the degree of yellowing, and may be prepared by reacting a phosphonic acid-based compound, aqueous ammonia, and water.

As the phosphonic acid-based compound, phenylphosphonic acid, isopropylmethylphosphonic acid, 2-phenylethylphosphonic acid, aminomethylphosphonic acid, 3-aminopropylphosphonic acid, aminomethylene bisphosphonic acid, and the like can be used.

At this time, the weight ratio of the phosphonic acid-based compound, aqueous ammonia and water is preferably 6:2-8:2-8.

The content of the dispersant is preferably 0.1 to 5 parts by weight based on 100 parts by weight of the acrylic resin, and if the content is less than 0.1 parts by weight, the degree of yellowing increases, and if the content exceeds 5 parts by weight, durability and abrasion resistance may decrease.

In addition, the present invention may further use an ammonium polycarboxylic acid salt as a dispersant, and the ammonium polycarboxylic acid may be prepared by reacting a polycarboxylic acid with aqueous ammonia. At this time, the solid content of the ammonium polycarboxylic acid salt is preferably 20 to 60% by weight.

Examples of the polycarboxylic acid include polyacrylic acid, polymethacrylic acid, polyacrylic acid copolymer, and polymethacrylic acid copolymer.

At this time, the weight ratio of the phosphonic acid-based compound and the polycarboxylic acid ammonium salt is preferably 60 to 80:20 to 40. When the above numerical range is satisfied, the dispersibility and anti-yellowing properties of the composition can be maximized.

The hollow polystyrene particles can induce diffuse reflection of the composition and improve whiteness, and have an effect of preventing dust from sticking due to a high glass transition temperature.

The content of the hollow polystyrene particles is preferably 0.5 to 30 parts by weight based on 100 parts by weight of the acrylic resin, and if the content is less than 0.5 parts by weight, the whiteness decreases, and if the content exceeds 30 parts by weight, durability and abrasion resistance may decrease. .

The crack inhibitor may improve the density, wettability and adhesion of the coating film to prevent cracking of the coating film, and tripropylene glycol n-butyl ether, dipropylene glycol n-butyl ether, and the like may be used.

The content of the crack inhibitor is preferably 2 to 20 parts by weight based on 100 parts by weight of the acrylic resin, and when the content is less than 2 parts by weight, the crack prevention property is deteriorated, and when it exceeds 20 parts by weight, the drying speed becomes slow.

In the present invention, tripropylene glycol n-butyl ether and dipropylene glycol n-butyl ether may be used simultaneously as a crack inhibitor, wherein the weight ratio of tripropylene glycol n-butyl ether and dipropylene glycol n-butyl ether is 60 to 80: It is preferable that it is 20-40. When the above numerical range is satisfied, the crack prevention property of the composition can be maximized.

In addition, in the present invention, a polycarboxylic acid 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate (texanol) may be further used as a crack inhibitor.

For example, tripropylene glycol n-butyl ether and texanol may be used simultaneously as a crack inhibitor, and the weight ratio of tripropylene glycol n-butyl ether and texanol is preferably 60 to 80:20 to 40. When the above numerical range is satisfied, the crack prevention property of the composition can be maximized.

In addition, in the present invention, tripropylene glycol n-butyl ether, dipropylene glycol n-butyl ether, and taxanol may be used simultaneously as a crack inhibitor, and at this time, tripropylene glycol n-butyl ether, dipropylene glycol n-butyl ether and taxanol The weight ratio of is preferably 100:40 ~ 70:20 ~ 50. When the above numerical range is satisfied, the crack prevention property of the composition can be maximized.

In addition, the composition may further include a copolymer of an acrylate group-containing silane coupling agent and an acrylic acid monomer.

A plurality of carboxyl groups included in the copolymer can improve adhesion of components in the composition, and improve wear resistance, heat resistance, and water resistance.

As the acrylate group-containing silane coupling agent, 3-methacryloxypropylmethyldimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropylmethyldiethoxysilane, and 3-methacryloxypropyltri Ethoxysilane, 3-acryloxypropyltrimethoxysilane, methacryloxymethyltriethoxysilane, and methacryloxymethyltrimethoxysilane.

The acrylic acid monomer is acrylic acid, methacrylic acid, methyl acrylic acid, ethyl acrylic acid, butyl acrylic acid, 2-ethyl hexyl acrylic acid, decyl acrylic acid, methyl methacrylic acid, ethyl methacrylic acid, butyl methacrylic acid, 2-ethyl hexyl methacrylic acid , Decyl methacrylic acid, and the like.

The weight ratio of the acrylate group-containing silane coupling agent and the acrylic acid monomer is preferably 10 to 30:70 to 90, and abrasion resistance, water resistance, heat resistance, and the like of the composition may be maximized within the above numerical range.

The copolymer of the acrylate group-containing silane coupling agent and the acrylic acid monomer is used in an amount of 1 to 10 parts by weight based on 100 parts by weight of the acrylic resin. The drying speed of the coating film decreases.

In addition, the composition may further include a silane coupling agent oligomer prepared by reacting an acrylate group-containing silane coupling agent and a phosphonic acid-based compound.

By using the silane coupling agent oligomer, the adhesiveness and anti-yellowing properties of the composition can be improved, and the thickness of the coating film can be uniformly adjusted.

As the acrylate group-containing silane coupling agent, 3-methacryloxypropylmethyldimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropylmethyldiethoxysilane, and 3-methacryloxypropyltri Ethoxysilane, 3-acryloxypropyltrimethoxysilane, methacryloxymethyltriethoxysilane, and methacryloxymethyltrimethoxysilane.

As the phosphonic acid-based compound, phenylphosphonic acid, isopropylmethylphosphonic acid, 2-phenylethylphosphonic acid, aminomethylphosphonic acid, 3-aminopropylphosphonic acid, aminomethylene bisphosphonic acid, and the like may be used.

The weight ratio of the acrylate group-containing silane coupling agent and the phosphonic acid-based compound is preferably 60 to 80:20 to 40, and when the above range is satisfied, the adhesiveness and anti-yellowing properties of the composition can be maximized.

The weight average molecular weight of the silane coupling agent oligomer is preferably 1,000 to 10,000 g/mol, and the silane coupling agent oligomer is preferably used in an amount of 1 to 10 parts by weight based on 100 parts by weight of the acrylic resin. When the content is less than 1 part by weight, the effect of the addition is insignificant, and when the content is more than 10 parts by weight, workability decreases and the thickness of the coating film becomes non-uniform.

In addition, the composition may further include a silane coupling agent oligomer prepared by reacting an epoxy group-containing silane coupling agent with tripropylene glycol n-butyl ether or dipropylene glycol n-butyl ether.

By using the silane coupling agent oligomer, it is possible to improve adhesion and crack prevention properties of the composition, and to uniformly control the thickness of the coating film.

The epoxy group-containing silane coupling agent is 2-glycidoxyethylmethyldimethoxysilane, 2-glycidoxyethylmethyldiethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, and 3-glycidoxypropylmethyldiethoxysilane. Glycidoxy C _1-4 alkyl C _1-4 alkyl C _1-4 alkoxysilane such as; Glycidoxy C ₁ such as 2-glycidoxyethyltrimethoxysilane, 2-glycidoxyethyltriethoxysilane, 3-glycidoxypropyltrimethoxysilane, and 3-glycidoxypropyltriethoxysilane _-4 alkyl C _1-4 alkoxysilane; 2-(3,4-epoxycyclohexyl)ethylmethyldimethoxysilane, 2-(3,4-epoxycyclohexyl)ethylmethyldiethoxysilane, 3-(3,4-epoxycyclohexyl)propylmethyldimethoxysilane Epoxy C _3-10 cycloalkyl C _1-4 alkyl C _1-4 alkyl C _1-4 alkoxysilane such as 3-(3,4-epoxycyclohexyl)propylmethyldiethoxysilane; 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, 2-(3,4-epoxycyclohexyl)ethyltriethoxysilane, 3-(3,4-epoxycyclohexyl)propyltrimethoxysilane And epoxy C _3-10 cycloalkyl C _1-4 alkyl C _1-4 alkoxysilanes such as 3-(3,4-epoxycyclohexyl)propyltriethoxysilane.

The weight ratio of the epoxy group-containing silane coupling agent and tripropylene glycol n-butyl ether or dipropylene glycol n-butyl ether is preferably 60 to 80:20 to 40, and when the above range is satisfied, the adhesiveness and crack prevention properties of the composition Can be maximized.

The weight average molecular weight of the silane coupling agent oligomer is preferably 1,000 to 10,000 g/mol, and the silane coupling agent oligomer is preferably used in an amount of 1 to 10 parts by weight based on 100 parts by weight of the acrylic resin. When the content is less than 1 part by weight, the effect of the addition is insignificant, and when the content is more than 10 parts by weight, workability decreases and the thickness of the coating film becomes non-uniform.

In addition, in the product comprising the coating composition, the product is characterized in that the coating material, coating agent or adhesive.

The coating composition of the present invention may be applied or coated on a substrate or road surface by a known method, for example, brush, roll coating, spray coating, or impregnation.

The thickness of the coating film is not particularly limited, and may be adjusted to a thickness of 0.1 μm to 20 mm depending on the application.

The coating film prepared from the coating composition of the present invention has a fast drying speed, low yellowing degree, is eco-friendly, and has excellent hardness, adhesion, abrasion resistance, weather resistance, water resistance, heat resistance, and impact resistance.

The present invention will be described in detail through examples and comparative examples below. The following examples are only illustrated for the practice of the present invention, and the contents of the present invention are not limited by the following examples.

(Example 1)

Phenylphosphonic acid, 28% aqueous ammonia, and water were reacted in a weight ratio of 6:6:6 to prepare a dispersant.

Polymethylmethacrylate emulsion resin (solid content 48% by weight) 100 parts by weight, titanium dioxide 20 parts by weight, calcium carbonate 150 parts by weight, dispersant 1 part by weight, polystyrene hollow particles 10 parts by weight, and tripropylene glycol n-butyl ether 10 parts by weight The parts were mixed to prepare a coating composition.

(Example 2)

A coating composition was prepared in the same manner as in Example 1, except that 1 part by weight of tripropylene glycol n-butyl ether was used.

(Example 3)

A coating composition was prepared in the same manner as in Example 1, except that 25 parts by weight of tripropylene glycol n-butyl ether was used.

(Example 4)

A coating composition was prepared in the same manner as in Example 1, except that 5 parts by weight of dipropylene glycol n-butyl ether was additionally used.

(Example 5)

A coating composition was prepared in the same manner as in Example 1, except that 5 parts by weight of dipropylene glycol n-butyl ether and 3 parts by weight of taxanol were additionally used.

(Example 6)

70 parts by weight of 3-methacryloxypropyltrimethoxysilane and 30 parts by weight of phenylphosphonic acid were reacted at 60° C. for 24 hours to prepare a silane coupling agent oligomer having a weight average molecular weight of 5,000 g/mol.

A coating composition was prepared in the same manner as in Example 1, except that 3 parts by weight of the silane coupling agent oligomer was additionally used.

(Comparative Example 1)

A coating composition was prepared in the same manner as in Example 1, except that 10 parts by weight of taxanol was used instead of 10 parts by weight of tripropylene glycol n-butyl ether.

After forming a coating film from the coating composition prepared from the above Examples and Comparative Examples, non-adhesive dryness, water resistance, abrasion resistance, luminance rate, and yellowness were measured, and the results are shown in Table 1 below.

Non-adhesive dryness was measured according to KS M 6080, and the time at which the paint did not stick to the tire of the non-adhesive tester was measured.

Water resistance was measured according to KS M ISO 1514, and after drying for 72 hours, immersed in water, left for 24 hours, taken out, and dried at room temperature for 2 hours to observe the state of the coating film. At this time, the state of the coating film was marked as excellent, excellent, moderate, and poor.

Wear resistance was measured according to KS M 6080, and retroreflectivity was measured after traffic level P7 (passing 4 million laps). Wear resistance is expressed as R3≥150, R4≥200, and R5≥300 according to the retroreflectivity performance (RL) in a dry state after passing 1 million wheels in white.

The luminance rate was measured according to KS M 6080.

As for the degree of yellowness, the coating film was left in an oven at 100° C. for 24 hours, taken out, and the degree of discoloration was observed, and marked as excellent, excellent, moderate, and poor.

division Example Comparative example One 2 3 4 5 6 One Non-stick dryness
(minute) 5 10 10 5 5 5 20 Water resistance Great usually usually eminence eminence eminence Bad Wear resistance
(Dry state) P7 (4 million times) R5 R4 R4 R5 R5 R5 R4 Luminance factor 90 87 86 90 90 90 82 Yellowness Great usually usually eminence eminence eminence Bad

From the results of Table 1, Examples 1 to 6 are excellent in non-adhesive dryness, water resistance, abrasion resistance, and yellowing, and in particular, Examples 4 to 6 have the most excellent properties.

On the other hand, it can be seen that the characteristics of Comparative Example 1 are poorer than that of the Example.

Claims (5)

Acrylic resin; Titanium dioxide; Calcium carbonate; Dispersant; Hollow polystyrene particles; And in the coating composition comprising a crack inhibitor,
Including 3 to 100 parts by weight of titanium dioxide, 50 to 300 parts by weight of calcium carbonate, 0.1 to 5 parts by weight of dispersant, 0.5 to 30 parts by weight of polystyrene hollow particles and 2 to 20 parts by weight of crack inhibitor, based on 100 parts by weight of the acrylic resin,
The crack inhibitor is a coating composition, characterized in that tripropylene glycol n-butyl ether or dipropylene glycol n-butyl ether.
delete The method of claim 1,
A coating composition, characterized in that it further comprises 1 to 10 parts by weight of a copolymer of an acrylate group-containing silane coupling agent and an acrylic acid monomer based on 100 parts by weight of the acrylic resin.
delete A product comprising the coating composition of claim 1, wherein the product is a paint, coating or adhesive.