KR20180048012A - Flame-retardant paint composition - Google Patents

Abstract

The present invention provides a flame-retardant paint composition capable of forming a coating film having excellent adhesion, water resistance, durability and flame-retardancy. The flame-retardant paint composition comprises: a water-dispersible acrylic resin; a pigment; an inorganic-based flame retardant; a hardener; and a solvent.

Description

Flame-Retardant Painting Composition {FLAME-RETARDANT PAINT COMPOSITION}

FIELD OF THE INVENTION The present invention relates to a flame retardant coating composition used for painting a vehicle (e.g., a railroad car, etc.).

As regulations for softening materials have been enacted or enforced throughout the world, various kinds of flame retardant materials have been developed and applied to various processed moldings, flame retardant fabrics, and flame-retardant paints. From this point of view, it is inevitable to flame-retard the paints used as final finishing materials for exterior finishing materials or interior materials of various buildings, and interior materials of passenger transportation railway vehicles.

The flame retardancy of the paint can be divided into additive type and reactive type depending on the method of producing the paint.

The additive type flame retardant paint is produced by mixing a flame-retardant raw material such as antimony oxide, a halogen compound, an inorganic material, etc., and has an advantage of relatively excellent flame retardancy. However, the additive type flame retardant paint is simply mixed with the flame-retardant raw material, and when the coating film is formed by using the flame retardant material, the adhesion and the water resistance of the film deteriorate due to the phase separation due to surface cracking of the coating film, And the appearance of the coating film becomes poor.

The reactive flame-retardant paint is a complement to the problem of the additive type flame-retardant paint. However, when an inorganic material is used as a flame retardant raw material for producing a reactive type flame retardant paint, compatibility with the binder resin is very low. In addition, halogen compounds are harmful to the combustion due to generation of toxic gas.

Accordingly, development of a flame retardant coating composition having better physical properties has been desired.

Korea Patent Publication No. 2007-0118463

The present invention provides a flame retardant coating composition capable of forming a coating film excellent in adhesion, water resistance, durability and flame retardancy.

Disclosure of the Invention In order to solve the above problems, the present invention provides a water-dispersible acrylic resin composition comprising a water-dispersed acrylic resin, a pigment, an inorganic flame retardant, a curing agent and a solvent, wherein a mixing ratio of the water- Wherein the mixing ratio of the acrylic resin to the inorganic flame retardant is 2.5 to 3.5: 1 by weight.

Here, the water-dispersed acrylic resin may have a viscosity of 2,000 to 3,500 mPa · s and a pH of 7 to 8.5.

Also, the water-dispersed acrylic resin may have a solid content of 35 to 45% and a content of hydroxyl groups in the solid content of 3 to 7%.

The inorganic flame retardant may be at least one selected from the group consisting of aluminum hydroxide, magnesium hydroxide, zinc borate and molybdenum compounds.

The flame retardant coating composition may further include at least one additive selected from the group consisting of a dispersant, a defoaming agent, a thickener, a UV stabilizer, a leveling agent, and a pH adjuster.

The flame retardant coating composition of the present invention is optimized for the combination of the water-dispersed acrylic resin, the curing agent and the inorganic flame retardant. When a coating film is formed using the same, a coating film excellent in properties such as adhesion, water resistance, durability and flame retardancy can be formed have.

Hereinafter, the present invention will be described.

The present invention relates to a two-pack type flame retardant coating composition which is water-soluble to minimize the release of a volatile organic compound (volatile organic compound) and can form a coating film having excellent flame retardancy as well as excellent adhesion, water resistance and durability. As follows.

The flame retardant coating composition (hereinafter referred to as "composition") of the present invention includes water-dispersed acrylic resin, pigment, inorganic flame retardant, curing agent, and solvent.

The water-dispersed acrylic resin contained in the composition of the present invention plays a role in improving the adhesion of the coating film, water resistance, durability and the like. The water-dispersed acrylic resin may have a form in which acrylic resin particles are dispersed in a solvent (in this case, the solvent corresponds to the dispersion medium of the acrylic resin particles and the content thereof is excluded from the content of the solvent contained in the composition of the present invention) , The acrylic resin particles may be composed of methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, methyl methacrylate, ethyl methacrylate, copolymers thereof, and mixtures thereof.

The content of the acrylic resin particles, that is, the ratio of the solid content may be 35 to 45% based on 100% by weight of the water-dispersible acrylic resin (a), and may be 40 to 43%. At this time, the ratio (content) of the solid content can be measured in accordance with DIN EN ISO 3219 / A.3. The proportion (content ratio) of the hydroxyl group (OH) contained in the solid content may be 3 to 7%, specifically 4.5 to 5%.

The water-dispersed acrylic resin may have a viscosity of 2,000 to 3,500 mPa · s at 23 ° C and a pH of 7 to 8.5 (specifically, 7.2 to 8.2). The water-dispersed acrylic resin may have an equivalent weight of 800 to 850 g / mol based on the hydroxyl group, a density of 1.01 to 1.09 g / mL at 20 DEG C, an acid value of 9.1 to 9.6 mgKOH / g.

Since the water-dispersed acrylic resin has a relatively high proportion of hydroxyl groups, it can exhibit high crosslinking density due to its excellent reactivity with a curing agent. Thus, the present invention can provide a coating film excellent in adhesion and durability. Further, the use of the water-dispersed acrylic resin can improve the compatibility with the inorganic flame retardant.

The content of the water-dispersed acrylic resin may be 35 to 40 parts by weight based on 100 parts by weight of the composition. If the content of the water-dispersed acrylic resin is less than 35 parts by weight, adhesion of the coating film and durability may be deteriorated. If the content is more than 40 parts by weight, the composition of the composition and the water resistance of the coating film may be deteriorated.

The pigment included in the composition of the present invention plays a role of imparting color to the coating film. Specific examples of the pigment include talc, calcium carbonate, carbon black, titanium oxide (TiO ₂ ), iron oxide, sulfur oxide, and mixtures thereof.

The content of such a pigment may be 10 to 20 parts by weight based on 100 parts by weight of the composition. If the content of the pigment is less than 10 parts by weight, the hiding power of the material may be deteriorated, and if it exceeds 20 parts by weight, the adhesion of the coating film may be deteriorated.

The inorganic flame retardant contained in the composition of the present invention has a role of improving the flame retardancy and mechanical strength of the coating film. Specific examples of the inorganic flame retardant include aluminum hydroxide, magnesium hydroxide, zinc borate, molybdenum compounds, and mixtures thereof.

The content of the inorganic flame retardant may be 7 to 18 parts by weight based on 100 parts by weight of the composition. If the content of the inorganic flame retardant is less than 7 parts by weight, the flame retardancy and mechanical properties of the coating film may be deteriorated. If the content is more than 18 parts by weight, adhesion of the coating film and water resistance may decrease.

The curing agent contained in the composition of the present invention reacts with the water-dispersed acrylic resin to form a urethane bond. As the curing agent, an isocyanate curing agent may be used. Specific examples of the isocyanate curing agent include hexamethylene diisocyanate (HDI), hexamethylene diisocyanate trimer (HDT), isophorone diisocyanate (IPDI), cyclohexylmethane diisocyanate (H12MDI), methylene diphenyl diisocyanate (MDI), toluene diisocyanate (TDI), and mixtures thereof.

The content of the curing agent may be 10 to 20 parts by weight based on 100 parts by weight of the composition. If the content of the curing agent is less than 10 parts by weight, the curing reactivity may be deteriorated. If the content of the curing agent is more than 20 parts by weight, the mechanical strength of the coating film may be decreased due to overcuring.

The solvent contained in the composition of the present invention plays a role in controlling the viscosity, dispersibility, etc. of the composition. Specific examples of the solvent include purified water such as ionized water, pure water, ultrapure water, distilled water and the like; Glycol ether solvents such as ethylene glycol monobutyl ether (butyl cellosolve), diethylene glycol butyl ether (butyl carbitol), dipropylene glycol butyl ether, dipropylene glycol methyl ether and the like; Or a mixture thereof.

The content of such a solvent may be 10 to 20 parts by weight based on 100 parts by weight of the composition. When the content of the solvent is less than 10 parts by weight, the appearance of the coating film may be poor. When the amount of the solvent is more than 20 parts by weight, dryness of the composition and workability in forming a coating film may be deteriorated. When the purified water and the glycol ether solvent are mixed with the solvent, the purified water content may be 9 to 16 parts by weight based on 100 parts by weight of the composition, and the glycol ether solvent may be 100 parts by weight Based on 1 to 4 parts by weight.

In the composition of the present invention, the water-dispersed acrylic resin, the inorganic flame retardant, and the curing agent are mixed at a specific ratio. Thus, the present invention provides a coating film excellent in physical properties such as adhesiveness, durability, water resistance and flame retardancy .

Specifically, the mixing ratio of the water-dispersed acrylic resin to the curing agent is in the range of 2.1 to 3.0: 1 (specifically, 2.2 to 2.8: 1), and the mixing ratio of the water- : 1.

Meanwhile, the composition of the present invention may further include at least one additive selected from the group consisting of a dispersant, a defoaming agent, a thickener, a UV stabilizer, a leveling agent, and a pH adjuster in order to further improve the physical properties of the coating film.

The dispersant serves to improve the dispersibility of the composition. Specific examples of such dispersants include anionic dispersants (for example, polycarboxylic acids, polycarboxylic acid amines, polycarboxylic acid amine salts, polycarboxylic acid sodium salts and the like), cationic dispersants, amphoteric ionic dispersants Dispersants, nonionic dispersants (for example, fluorine-based surfactants), and mixtures thereof.

The antifoaming agent serves to inhibit the generation of bubbles during the formation of the coating film. These defoaming agents may be those known in the art.

The thickener serves to improve the flowability of the composition. Specific examples of such a thickener include a urethane-based thickener, an acrylic thickener, and the like.

The ultraviolet stabilizer serves to improve the inner cream resistance and durability of the coating film. Specific examples of such ultraviolet stabilizers include hindered amine compounds and the like.

The leveling agent serves to improve the smoothness of the coating film. Specific examples of such leveling agents include polyacrylate copolymers and polyether siloxane-based compounds.

The pH adjusting agent serves to improve the storage stability of the composition. Specific examples of the pH adjuster include ammonia water, diethanolamine, dimethylethanolamine, aminomethylpropanol, and the like.

The amount of such an additive may be 1 to 5 parts by weight based on 100 parts by weight of the composition in consideration of the overall physical properties of the composition.

The composition according to the present invention is excellent in adhesion, water resistance, durability and flame retardancy, has little emission of volatile organic compounds and can exhibit transparency, and is useful when coating interior and exterior materials of various buildings, interior and exterior materials of vehicles Can be used.

Hereinafter, the present invention will be described in detail with reference to examples. However, the following examples are illustrative of the present invention, and the present invention is not limited by the following examples.

[ Example  One]

Each component was compounded and dispersed, and the final viscosity was adjusted with a solvent to prepare a composition. The composition of each component was as shown in Table 1 below.

[ Example  2 to 9]

The composition was prepared in the same manner as in Example 1, except that the composition shown in Table 1 was used.

ingredient Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Example 9 Water-dispersed acrylic resin Solid content ratio: 40 to 43%
pH: 7.2 to 8.2,
Ew: 830 g / mol,
OH ratio: 5% 37.5 35.9 37.7 36.3 37.3 35.7 38.9 36.7 38.2 Pigment TiO ₂ 15.0 15.6 16.4 15.8 16.2 15.0 15.0 15.0 15.0 Inorganic flame retardant Al (OH) ₃ 12.5 11.7 12.3 11.9 12.2 14.3 11.1 13.3 11.8 Hardener hydrophilic polyisocyanate 15.0 16.5 13.5 15.7 14.2 15.0 15.0 15.0 15.0 solvent Ion water 14 14.3 14.1 14.3 14.1 14 14 14 14 Diethylene
Glycol butyl ether 5 5 5 5 5 5 5 5 5 additive Defoamer
(tetramethyl decynediol) 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 Leveling agent
(polyether siloxane copolymer) 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 Total (parts by weight) 100 100 100 100 100 100 100 100 100 Water-dispersed acrylic resin: ratio of inorganic flame retardant
(Weight ratio) 3.0: 1 3.1: 1 3.1: 1 3.1: 1 3.1: 1 2.5: 1 3.5: 1 2.8: 1 3.3: 1 Water-dispersed acrylic resin: ratio of curing agent
(Weight ratio) 2.5: 1 2.2: 1 2.8: 1 2.3: 1 2.6: 1 2.4: 1 2.6: 1 2.4: 1 2.5: 1

[ Comparative Example  1 to 4]

The composition was prepared in the same manner as in Example 1, except that the composition shown in Table 2 was used.

ingredient Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Water-dispersed acrylic resin Solid content ratio: 40 to 43%
pH: 7.2 to 8.2,
Ew: 830 g / mol,
OH ratio: 5% 34.5 38.5 33.3 40.0 Pigment TiO ₂ 15.0 16.7 15.0 15.0 Inorganic flame retardant Al (OH) ₃ 11.3 12.6 16.7 10.0 Hardener hydrophilic polyisocyanate 18.7 12.4 15.0 15.0 solvent Ion water 14.5 13.8 14 14 Diethylene glycol butyl ether 5 5 5 5 additive Defoamer
(tetramethyl decynediol) 0.5 0.5 0.5 0.5 Leveling agent
(polyether siloxane copolymer) 0.5 0.5 0.5 0.5 Total (parts by weight) 100 100 100 100 Water-dispersed acrylic resin: ratio of inorganic flame retardant
(Weight ratio) 3.1: 1 3.1: 1 2.0: 1 4.0: 1 Water-dispersed acrylic resin: ratio of curing agent
(Weight ratio) 1.8: 1 3.1: 1 2.2: 1 2.7: 1

[ Manufacturing example  1 to 9 and Comparative Manufacturing Example  1 to 4]

The compositions prepared in Examples 1 to 9 and Comparative Examples 1 to 4 were spray coated on CR steel and dried at 80 DEG C for 30 minutes to form coating films each having a thickness of 40 to 50 mu m.

[ Experimental Example ]

Physical properties of the coating films prepared in Production Examples 1 to 9 and Comparative Production Examples 1 to 4 were evaluated as follows, and the results are shown in Tables 3 and 4 below.

1. Adhesion: Measured according to ASTM D 3359.

2. Pencil hardness: Measured according to ASTM D 3363-5.

3. Impact resistance: Measured according to BS 3900 PART E7.

Flexibility: Measured according to KS M ISO 1520.

5. Alkali resistance: Measured according to KS M ISO 2812-1.

6. Acid resistance: Measured according to KS M ISO 2812-1.

7. Water resistance: Measured according to KS M ISO 2812-1.

8. Flammability: Measured according to EN45545.

Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Example 9 Attachment ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ Pencil hardness ◎ ○ ○ ○ ◎ ◎ ◎ ◎ ◎ Impact resistance ◎ ◎ ○ ◎ ○ ◎ ◎ ◎ ◎ Flexibility ◎ ◎ ○ ◎ ○ ◎ ◎ ◎ ◎ Alkali resistance ◎ ○ ○ ○ ○ ◎ ◎ ○ ◎ Acid resistance ◎ ○ ○ ○ ○ ◎ ◎ ○ ◎ Water resistance ◎ ○ ○ ○ ○ ◎ ◎ ○ ◎ Flammability ◎ ○ ◎ ○ ◎ ◎ ○ ◎ ○ ?: Excellent,?: Good,?: Poor, X: Bad

Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Attachment ○ △ △ ○ Pencil hardness ○ × ○ ○ Impact resistance ○ ○ △ ○ Flexibility ○ ○ △ ○ Alkali resistance ○ × × ○ Acid resistance ○ × × ○ Water resistance ○ × × ○ Flammability ○ ○ ○ △ ?: Excellent,?: Good,?: Poor, X: Bad

Referring to Tables 3 and 4, it can be seen that the physical properties of the coating film are excellent when a coating film is formed from a composition in which the mixing ratio of the water-dispersed acrylic resin, the inorganic flame retardant, and the curing agent is within the range of the present invention.

Claims (6)

Water-dispersed acrylic resin;
Pigments;
Inorganic flame retardants;
Curing agent; And
Comprising a solvent,
Wherein the mixing ratio of the water-dispersed acrylic resin to the curing agent is from 2.1 to 3.0: 1,
Wherein the mixing ratio of the water-dispersed acrylic resin and the inorganic flame retardant is 2.5 to 3.5: 1 by weight. The method according to claim 1,
Wherein the water-dispersed acrylic resin has a viscosity of 2,000 to 3,500 mPa.s and a pH of 7 to 8.5. The method according to claim 1,
Wherein the water-dispersed acrylic resin has a solid content of 35 to 45%, and a content of hydroxyl groups in the solid content of 3 to 7%. The method according to claim 1,
Wherein the inorganic flame retardant is at least one selected from the group consisting of aluminum hydroxide, magnesium hydroxide, zinc borate and molybdenum compound. The method according to claim 1,
35 to 40 parts by weight of the water-dispersed acrylic resin;
10 to 20 parts by weight of the pigment;
7 to 18 parts by weight of an inorganic flame retardant;
10 to 20 parts by weight of a curing agent; And
And 10 to 20 parts by weight of a solvent. The method according to claim 1,
Wherein the composition further comprises at least one additive selected from the group consisting of a dispersant, a defoaming agent, a thickener, a UV stabilizer, a leveling agent, and a pH adjuster.