KR20170084747A - Water paint composition having good workability - Google Patents
Water paint composition having good workability Download PDFInfo
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- KR20170084747A KR20170084747A KR1020160003781A KR20160003781A KR20170084747A KR 20170084747 A KR20170084747 A KR 20170084747A KR 1020160003781 A KR1020160003781 A KR 1020160003781A KR 20160003781 A KR20160003781 A KR 20160003781A KR 20170084747 A KR20170084747 A KR 20170084747A
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- thickener
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- viscosity
- coating composition
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Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/02—Emulsion paints including aerosols
- C09D5/022—Emulsions, e.g. oil in water
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/02—Emulsion paints including aerosols
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/02—Emulsion paints including aerosols
- C09D5/024—Emulsion paints including aerosols characterised by the additives
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/02—Emulsion paints including aerosols
- C09D5/024—Emulsion paints including aerosols characterised by the additives
- C09D5/028—Pigments; Filters
-
- C09D7/125—
Abstract
The present invention relates to a cellulose thickener comprising a mixture of an acrylic emulsion, a cellulose thickener, a pigment, a synthetic urethane thickener, and water of the remainder, in particular cellulose thickener mixtures having two substituents different from each other having hydroxyalkylcellulose as a main chain, The present invention relates to a waterborne coating composition which is low in sensitivity to temperature and improved in flow resistance to ensure workability even in the summer season and has excellent workability for various coating methods through imparted rigidity .
Description
The present invention relates to a waterborne coating composition having excellent workability.
Water-based paint and other finishing materials have been widely used as building finishing materials for many years due to the protection of concrete materials, the beauty of appearance, the convenience of construction, and the ease of maintenance.
Water-based paints are classified into 100% acrylic emulsion, styrene-acrylic emulsion and vinyl-based emulsion depending on the type of emulsion. Due to the market demand, economical efficiency and convenience for environment-friendly building materials, water- The proportion of use is increasing.
Also, water-soluble paints, which are used as major finishes in the world, are divided into external and internal paints depending on the application. In the existing domestic construction market, more than 60% of the residential buildings are apartment-based. Conventionally, water-based paints are used as exterior and interior wall coating materials. However, with the enforcement of environmental regulations for environment-friendly materials, The number of finishes has increased steadily.
Water-based paints include resins, pigments, and water, which are very difficult to satisfactorily satisfy the required performance of a paint, and may not be solved by resin or pigment alone. In this case, it is possible to improve the physical properties of the coating material by using the additive. At this level, the amount of the additive to be used is small, but it is a very important component in the coating material.
Korean Patent Laid-Open Publication No. 2015-0102352 discloses a coating composition which is excellent in spraying workability by applying a urethane thickener and can be applied as a quick-drying coating film through a spray gas medium. Further, Japanese Patent Application Laid-Open No. 2005-225927 discloses a coating composition which can combine various kinds of thickening agents to ensure excellent workability, and is excellent in self-leveling. However, the water-based paint has a high sensitivity to the temperature and thus has a problem that the workability changes largely in accordance with the temperature change.
Accordingly, there is still a demand for a waterborne coating composition suitable for domestic environmental conditions having four seasons, because the sensitivity to temperature is low and the flow resistance is improved and the workability is not lowered during the summer.
The present invention relates to a cellulose thickener comprising a mixture of an acrylic emulsion, a cellulose thickener, a pigment, a synthetic urethane thickener, and water of the remainder, in particular cellulose thickener mixtures having two substituents different from each other having hydroxyalkylcellulose as a main chain, The present invention provides a waterborne coating composition which is low in sensitivity to temperature and improved in flow resistance to ensure workability even in the summer season and has excellent workability for various coating methods through imparted rigidity by using a swelling emulsion thickener As a technical problem.
The aqueous coating composition of the present invention comprises 10 to 40 parts by weight of an acrylic emulsion, 0.1 to 1.0 part by weight of a cellulose thickener, 0.2 to 1.5 parts by weight of an alkali swellable emulsion thickener, 15 to 55 parts by weight of a pigment, 0.2 to 2 parts by weight of a synthetic urethane thickener and water of the remainder, and the cellulose thickener is a mixture of two types of cellulose thickeners having hydroxyalkylcellulose as a main chain.
Since the water-based coating composition of the present invention is low in sensitivity to temperature and improved in flow resistance, workability can be secured even in the summer, spraying property and roller workability are excellent, and various leveling properties can be applied. Suitable for clear domestic environmental conditions.
Hereinafter, the present invention will be described in more detail.
The aqueous coating composition of the present invention comprises 10 to 40 parts by weight of an acrylic emulsion, 0.1 to 1.0 part by weight of a cellulose thickener, 0.2 to 1.5 parts by weight of an alkali swellable emulsion thickener, 15 to 55 parts by weight of a pigment, 0.2 to 2 parts by weight of a synthetic urethane thickener and water of the remainder, and the cellulose thickener is a mixture of two types of cellulose thickeners having hydroxyalkylcellulose as a main chain.
(A) Acrylic emulsion
The acrylic emulsion used in the composition of the present invention is a binder resin, which is attached to a conductor such as general concrete or mortar to form a coating film which is cured by volatilization of water at normal temperature.
The acrylic emulsion may be prepared by emulsion polymerization of an acrylic monomer composition in an aqueous medium (e.g., water) in the presence of a polyvinyl alcohol-based material.
The polyvinyl alcohol-based material may include an anion-modified polyvinyl alcohol such as a sulfonic acid-modified polyvinyl alcohol, a carboxylic acid-modified polyvinyl alcohol, or a combination thereof.
The acrylic monomer composition may include an acrylic monomer, and may further include other components.
The acrylic monomer may be at least one monomer selected from the group consisting of ethyl acrylate, ethyl methacrylate, methyl acrylate, methyl methacrylate, propyl acrylate, propyl methacrylate, butyl acrylate, butyl methacrylate, 2-ethylhexyl acrylate, Hexyl methacrylate, cyclohexyl methacrylate, cyclohexyl acrylate, alkoxyethyl acrylate, or combinations thereof.
The other component may be a monomer copolymerizable with the vinyl acetate-based monomer and the acrylic monomer (e.g., divinylbenzene, divinyl adipate, ethylene glycol di (meth) acrylate, diethylene glycol di (meth) Acrylate); Water-soluble oligomers (e.g., 2-methacrylamide-2-methylpropanesulfonic acid copolymer, sodium methacrylate-4-styrene sulfonate copolymer, polyvinylpyrrolidone, poly (meth) acrylate); Polymerization initiators (for example, potassium persulfate, sodium persulfate, ammonium persulfate, hydrogen peroxide); Polymerization regulators (e. G., Methanol, ethanol, propanol, acetone, dodecyl mercaptan); A first emulsifier (e. G., Sodium lauryl sulfate), and combinations thereof.
The acrylic emulsion may have a glass transition temperature (Tg) of -5 to 50 ° C and a particle size (P / S) of 50 to 300 nm.
The composition of the present invention may contain 10 to 40 parts by weight, for example 15 to 40 parts by weight, such as 20 to 35 parts by weight, for example 25 to 35 parts by weight, of the acrylic emulsion. If the content of the acrylic emulsion is too small, the ability to form a film may deteriorate and the quality of durability such as water resistance and alkali resistance may significantly deteriorate. Therefore, when the content of the acrylic emulsion is excessively high, There is a problem that it is difficult to apply to matting paints applied to general building walls due to the increase in gloss.
(B) Cellulose thickener
The cellulose thickener used in the composition of the present invention is a component which imparts viscosity to a coating material and is a compound in which the hydrophilic group of the skeleton improves the compatibility of the waterborne coating and the association property between the side chains substituted with hydrophobic components Thereby imparting viscosity to the paint and improving flowability. It also improves viscosity retention and sprayability even in high shear conditions such as spraying work and improves storage stability of paint by high compatibility and structural characteristics of dispersed state.
The cellulose thickener of the present invention is a conglomerate thickener having a hydrophobic group in the molecule. In the present specification, the term "recurrences" means that the hydrophobic group substituted by the associative thickener interacts with the emulsion in the aqueous coating composition, This is an effect of increasing the viscosity and improving the paint spatter and workability at the time of coating.
The hydrophobic group is not particularly limited as long as it exhibits hydrophobicity, such as a hydrocarbon group, a halogenated alkyl group, and an organic silicon group.
The cellulose thickening agent used in the present invention may be a mixture of two types of cellulose thickeners having hydroxyalkyl cellulose as a main chain. For example, hydroxyethyl cellulose and ethyl hydroxyethyl cellulose having excellent tinting strength, paint appearance and pigment dispersibility, Cellulose < / RTI > It is possible to increase the sprayability and maximize the storage stability by using the plasticity controlled through the combination of hydrophilic property and association property difference caused by the difference of the main chain and substituent. The hydroxyethylcellulose and ethylhydroxyethylcellulose may be mixed in a weight ratio of 1: 5 to 1: 1, preferably 1: 2 to 1: 1.
In addition, the cellulose thickener preferably has a viscosity of 100 to 20,000 cps, more preferably 200 to 10,000 cps, based on 1 wt% aqueous solution measured at 20 캜 with a Brookfield viscometer. If the viscosity of the cellulose thickener is less than 100, the viscosity efficiency may be low and the amount used may increase. If the viscosity is more than 20,000, the production efficiency may decrease. In addition, a pH of 3 to 8, preferably 5 to 7, can be used.
The composition of the present invention may contain 0.1 to 1.0 part by weight, for example, 0.1 to 0.5 part by weight, for example, 0.1 to 0.3 part by weight, of a cellulose thickening agent. When the content of the cellulose thickener is too small, the sprayability of the coating is weakened and the storage property is weakened due to weakness of the plasticity. If the content is excessive, the storage property may be increased proportionally. However, Firing is improved, and appearance defects and poor workability are caused. In particular, it may lead to deterioration of coating film durability as a raw material adversely affecting water resistance.
(C) Alkali swellable emulsion thickener
The coating composition of the present invention may contain an alkali swellable emulsion thickener.
Alkali swellable thickener refers to a copolymer of (meth) acrylic acid and a water-insoluble ester of the acid, which is capable of absorbing a large amount of water when the medium is alkaline, thereby forming a gel and thereby improving viscosity , These copolymers can also be crosslinked.
The alkali swellable thickener is expressed as "alkali-swellable" because it thickens under alkaline conditions, and the result is a mechanism in which the various carboxylate groups of the polymer main chain dissociate and swell in the alkaline state. The effect of interfacial migration caused by the swollen chains and the association of the side chains leads to an increase in viscosity.
Generally, the alkali swellable thickener is prepared in the form of a direct emulsion of an alkali-swellable polymer in water, the active ingredient content thereof being 10 to 45% by weight of the total weight thereof.
The alkali swellable thickener imparts a viscosity to the coating material. In particular, the coating material has a strong viscosity formation in a low shear state to generate a flow behavior such as a gel shape, thereby improving the sagging property. In addition, as a swellable thickener whose crystallinity is less controlled, flow and interlocking properties are interfered between coating compositions, so that a viscosity characteristic insensitive to temperature change is developed. The alkali swellable anionic thickener may be used having a pH of 2 to 5, a solid content of 20 to 40%, and a viscosity of 5 to 100 mPa.s at 20 캜.
The composition of the present invention may contain 0.2 to 1.5 parts by weight, for example, 0.3 to 1.5 parts by weight, for example, 0.4 to 1 part by weight, of an alkali swellable emulsion thickener. When the content of the alkali swellable emulsion thickener is too low, sensitivity to temperature is increased and the gagging property is deteriorated. In the case of excessive use, problems such as deterioration of jetting property outside the gelation of the paint or improvement in viscosity during long-term storage may occur.
(D) Pigment
The coating composition of the present invention may comprise a pigment. The pigment may be selected from the group consisting of talc, titanium dioxide, kaolin, and combinations thereof, for example, a mixture of talc, titanium dioxide and kaolin may be used. The pigment may include, for example, 15 to 55 parts by weight, preferably 18 to 50 parts by weight.
Talc adjusts the strength and gloss of the coating, while titanium dioxide and kaolin serve to conceal the coating. Though not particularly limited, talc having a whiteness of 90% or more can be used, and titanium dioxide having a rutile content of 95% or more can be used, and kaolin having a purity of 95% or more can be used.
The composition of the present invention may contain 2 to 20 parts by weight, for example 10 to 18 parts by weight, for example 13 to 16 parts by weight, of talc. The content of talc can be variably applied according to the desired level of gloss. Since the amount of fine cracks in the external appearance of the coating film is less than that of general constitutional pigments and the film strength is high, the content of the talc may vary depending on the desired quality level Applicable
In addition, the composition of the present invention may contain titanium dioxide in an amount of 10 to 25 parts by weight, for example, 15 to 23 parts by weight, for example, 18 to 22 parts by weight. If the content of titanium dioxide is too low, it may be difficult to control the hiding of the coating due to low hiding power at the initial stage of operation, and there is a problem in that the hiding effect is less than the rise in the excessive use, so the content can be applied differently depending on the situation.
In addition, the composition of the present invention may contain 3 to 10 parts by weight, for example 3 to 8 parts by weight, for example, 3 to 6 parts by weight of kaolin. Kaolin can compensate for the hysteresis by replacing TIO 2. However, when the content is low, the effect of improving concealment is insufficient. When the amount of kaolin is excessive, high oil absorption pigment may adversely affect the microcracking of the film or the durability of the film over a long period of time.
(E) Synthesized urethane thickener
The associative urethane thickener to be used in the coating composition of the present invention is a component which imparts viscosity of a coating material and improves the flowability between the pigments or the constituents of the coating material by using pigment affinity and associative properties, Spatter resistance is used to improve the workability and workability of the roller.
The associative thickener is a water-soluble polymer having an insoluble hydrophobic group, and when introduced into water, the hydrophobic groups are likely to associate in the form of micelle aggregates, so that these aggregates are linked together by the hydrophobic portion of the polymer, Formation of a three-dimensional network occurs.
Of these associative thickeners, there is a class of associative thickeners of the HEUR (Hydrophobically Modified Ethylene Oxide Urethane) type. These refer to the copolymers produced synthetically between monomers or condensates referred to as "associations" of alkyl, aryl or arylalkyl types of polyalkylene glycol type compounds, polyisocyanates and hydrophobic end groups.
The associative urethane thickener may have a solid content of 10 to 30% and a viscosity at 20 캜 of 100 to 4,000 mPa.s, for example, a hydrophobically modified ethylene oxide urethane block copolymer may be used.
The composition of the present invention may contain 0.2 to 2 parts by weight, for example, 0.3 to 1.5 parts by weight, for example, 0.4 to 1 part by weight, of the associative urethane thickener. When the content of the urethane thickener is low, the viscosity of the high shear state is greatly decreased, thereby causing a problem in the work quality. In case of excessive amount, the water resistance and color separation are caused, and the accelerated layer separation of the coating material and the precipitation There are problems that adversely affect.
The coating composition of the present invention may further comprise at least one additive selected from dispersants, preservatives, antifoaming agents and wetting agents. The content of the additive is not particularly limited, but may be 0.1 to 10 parts by weight.
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 aqueous coating compositions of Examples 1 and 2 and Comparative Examples 1, 2, 3 and 4 were prepared with the compositions shown in Table 1 below.
Acrylic emulsion: glass transition temperature (Tg) -5 to 50 占 폚, particle size (P / S) 50 to 300 nm
Hydrophobic modified ethylhydroxyethylcellulose: Brookfield viscosity 200-7,000 mPa.s (1% solution, LVT, 6 rpm, spindle No. 1, 20 ° C), pH 5-7
Hydrophobic modified hydroxyethylcellulose: Brookfield viscosity 400 to 10,000 mPa.s (1% solution, LVT, 6 rpm, spindle No. 1, 20 ° C), pH 5 to 7
Alkali swellable emulsion thickener: HISOL D308, Brookfield viscosity 5 to 100 mPa.s (20 DEG C), pH 2 to 5, solids 20 to 40%
Talc: 90% or more whiteness
Titanium dioxide: Rutile content 95% or more
Kaolin: calcined kaolin (kaolin content over 95%)
Synthesized urethane thickener: Rheovis PE1331, Brookfield Viscosity 500 ~ 4,000 mPa.s (20 占 폚), solids 10 ~ 30%
Defoamer: TEGO-foamex810
The physical properties of the aqueous coating composition prepared from the above components were evaluated in the following manner and are shown in Table 2.
ICI Viscosity And Roller Roll Island Comparison standard
Using a cone & viscometer according to ASTM D4287 (at 25 ℃), the viscosity is measured,
- Roller rolling difficulty: less than or equal to 0.8
- Roller rolling accuracy: 0.9 to 1.1
- Excellent roller rollability: 1.2 or more
Sprayability comparison standard
Using the spray gun (discharge pressure: 120Mpa, 325tip), spray paint on the Leneta form 2C application chart at the distance of 50cm for the same time to compare the paint condition and the concealment level of the painted paint on the black painted surface
- Thirteen: When the cover is not spread evenly on the black substrate and the cover is obviously generated
- Normal: Evenly applied on the front of the black base, but differentiated by the zone
- Excellent: When the black coating surface is applied evenly and the concealment deviation does not occur
Anti-Sagging Comparison Standard
After coating with Leneta Anti-sag meter (ASM-3, Highrange), left standing at 25 ℃ for 3 hours
Rate of decrease in viscosity at high temperature (%) Comparative standard
The rate of change (%) of KU viscosity which is changed when the paint temperature is raised from 25 ° C to 40 ° C. The lower the change rate is, the lower the temperature sensitivity is
Comparison of water resistance
The coating was applied to a smooth surface of a flexible plate (about 150 mm × 50 mm × 3 mm) with a thickness of 40 to 80 μm, followed by complete drying for 3 days,
- Defect: Blister and appearance deformation occurred within 2 days
- Good: no blister and no external deformation for more than 2 days
Dichroism Comparative Standard
The product colored with a yellowish brown line (similar color: Munsell Code 9.1YR6.6 / 2.9) is touch-up with a brush on the base surface of the roller, and discriminated based on the color difference ΔE of the roller / brush surface
- Defective: △ E = 0.3 or more
- Good: Within △ E = 0.3
Stability comparison standard
Comparison of the state in which the layer separation (generation of the liquid phase layer) of the coating material and the change in fluidity outside the settling state occurred after 3 months left at 25 ° C at room temperature
As can be seen from Table 2, the water-based coating compositions of Examples 1 and 2 of the present invention were excellent in overall paint quality such as roller workability, sprayability and storage stability. On the other hand, in the case of Comparative Examples 1 to 3, although the viscosity of the alkali swellable emulsion was not used, the viscosity was improved by using ethylhydroxyethylcellulose thickener or associative urethane thickener in an excessive amount, , Roller workability, sprayability, dichroism and storage stability were relatively poor.
Therefore, the water-based coating composition of the present invention is low in sensitivity to temperature and improved in flow resistance, thus ensuring workability in the summer, excellent in sprayability and roller workability, and excellent in four environmental conditions And it was found to be suitable.
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020160003781A KR101848988B1 (en) | 2016-01-12 | 2016-01-12 | Water paint composition having good workability |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020160003781A KR101848988B1 (en) | 2016-01-12 | 2016-01-12 | Water paint composition having good workability |
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| KR20170084747A true KR20170084747A (en) | 2017-07-21 |
| KR101848988B1 KR101848988B1 (en) | 2018-04-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20190068054A (en) | 2017-12-08 | 2019-06-18 | 롯데정밀화학 주식회사 | Water-based paint composition having excellent water resistance and water-based paint prepared therefrom |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102313888B1 (en) * | 2020-12-01 | 2021-10-18 | 주식회사 케이씨씨 | Coating Composition |
| KR102545655B1 (en) * | 2021-02-25 | 2023-06-20 | 주식회사 케이씨씨 | Coating Composition |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0997502A1 (en) | 1998-10-30 | 2000-05-03 | Hercules Incorporated | Combinations of associative thickeners and aqueous protective coating compositions |
| JP2005225927A (en) * | 2004-02-12 | 2005-08-25 | Nippon Paint Co Ltd | Water paint composition and method for forming paint film with the same |
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2016
- 2016-01-12 KR KR1020160003781A patent/KR101848988B1/en active IP Right Grant
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20190068054A (en) | 2017-12-08 | 2019-06-18 | 롯데정밀화학 주식회사 | Water-based paint composition having excellent water resistance and water-based paint prepared therefrom |
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| KR101848988B1 (en) | 2018-04-16 |
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