JP4675052B2 - Water-based coating material - Google Patents

Description

  The present invention relates to a novel aqueous coating material.

Conventionally, as a coating material applied to a building or a civil engineering structure, an aqueous coating material capable of forming a thick film of about 1 to 10 mm has been used. Specifically, various coating materials such as lysine, stucco, spray tile, single layer elastic coating material and the like can be mentioned. These are coating materials that can impart various uneven patterns to the formed coating film. Moreover, putty, a filler, a surfacer etc. are mentioned as an aqueous coating material for repairing the unevenness | corrugation of a foundation | substrate, a burrow, a crack, etc.
In such a thick film type water-based coating material, various fibers such as pulp fiber, acrylic fiber, polyester fiber, nylon fiber and carbon fiber are usually mixed for the purpose of improving the strength and preventing cracking in the formed coating film. Yes.

For example, in Japanese Patent Laid-Open No. 52-136229 (Patent Document 1), 10 to 150 parts by weight of an inorganic filler and 1 to 50 parts by weight of a fiber such as pulp or polyethylene are mixed with 100 parts by weight of a synthetic resin emulsion. A water-based coating material for forming a concavo-convex pattern is described.
Japanese Patent Application Laid-Open No. 8-134378 (Patent Document 2) describes an aqueous coating material for base preparation, which contains synthetic resin emulsion, extender pigment, thickener, and fibers such as pulp as main components.

However, in the water-based coating material as described in the above-mentioned patent document, there are cases where the fibers cannot be uniformly dispersed when the fibers are mixed. In addition, there is a problem in that foaming tends to occur in the coating material in the dispersion step after fiber mixing. Such a problem may adversely affect the finished appearance of the formed coating film.
Further, in the conventional aqueous coating material, the strength and crack prevention property of the formed coating film can be improved by mixing the fibers, but there is also a problem that the stretchability of the formed coating film is remarkably lowered.

JP-A-52-136229 JP-A-8-134378

This invention is made | formed in view of this situation, and it aims at solving the following subjects in the aqueous coating material containing a fiber.
(1) Increase the dispersibility of the fibers in the aqueous coating material.
(2) Suppresses foaming caused by fiber mixing.
(3) To improve the elongation of the formed coating film due to fiber mixing.

  As a result of intensive studies, the present inventor has found that the above problem can be solved by mixing cellulose acetate fibers having a fiber length of 0.01 to 10 mm into an aqueous coating material.

That is, the present invention relates to an aqueous coating material having the following characteristics.
1. A water-based coating material containing a binder, a granular material, and a fiber as essential components, and containing 0.01 to 10% by weight of the fiber with respect to the entire coating material, the fiber having a fiber length of 0.01 to 10 mm , a fiber An aqueous coating material comprising cellulose acetate fibers having a diameter of 10 to 1000 μm .
2. 1. The cellulose acetate fiber is a waste material of a tobacco filter. The water-based coating material as described.
3. 1. The binder is a cross-linked binder having a reactive functional group. Or 2. A water-based coating material as described in 1.

ADVANTAGE OF THE INVENTION According to this invention, the dispersibility of the fiber in an aqueous coating material can be improved. It is also possible to suppress foaming in the fiber dispersion step.
Further, in the formed coating film, the strength improvement effect and cracking prevention effect equivalent to or higher than those of the conventional product can be obtained, and the decrease in elongation seen with the conventional product can be improved.
The use of tobacco filter waste as cellulose acetate fiber can greatly contribute to resource reuse.

  Hereinafter, the present invention will be described in detail based on the best mode.

  The aqueous coating material of the present invention contains a binder, a granular material, and fibers as essential components.

  Of these, water-soluble, water-dispersed, solvent-soluble, solvent-dispersed, and solventless organic binders and / or inorganic binders can be used as the binder. Examples of the organic binder include acrylic resin, vinyl chloride resin, vinyl acetate resin, polyurethane resin, acrylic silicon resin, fluorine resin, epoxy resin, polyester resin, melamine resin, alkyd resin, and the like. Examples of the inorganic binder include Portland cement, alumina cement, super fast cement, expanded cement, acid phosphate cement, silica cement, lime mixed cement, blast furnace cement, fly ash cement, keens cement, magnesia cement, dolomite, Examples include hydraulic lime, gypsum, and water glass. These can be used alone or in combination of two or more.

The binder of the present invention is not particularly limited, such as a crosslinked type or a non-crosslinked type, but a crosslinked type binder containing a reactive functional group is preferably used. The use of a cross-linking binder is preferable because a coating film having improved strength of the formed coating film and excellent in low contamination and weather resistance can be obtained.
Examples of combinations of such reactive functional groups include, for example, epoxy-amine, polyol-isocyanate, carboxyl-epoxy, carboxyl-metal ion, carboxyl-carbodiimide, carboxyl-oxazoline, carbonyl-hydrazide, hydrolyzable silyl groups, and the like. Is mentioned. Among these, a combination of carboxyl-epoxy, carboxyl-metal ion, carboxyl-carbodiimide, carboxyl-oxazoline, carbonyl-hydrazide, hydrolyzable silyl groups and the like is preferably used, and a combination of carbonyl-hydrazide is particularly preferable.

  The mixing ratio of the binder is usually about 5 to 95% by weight, preferably about 10 to 80% by weight, based on the entire coating material.

Examples of the powder particles include titanium oxide, zinc oxide, carbon black, ferric oxide (bengala), yellow iron oxide, ultramarine, cobalt green, and other inorganic color pigments, azo, naphthol, pyrazolone, and anthraquinone. , Perylene, quinacridone, disazo, isoindolinone, benzimidazole, phthalocyanine, quinophthalone and other organic color pigments; heavy calcium carbonate, light calcium carbonate, kaolin, clay, porcelain clay, china clay, Body pigments such as diatomaceous earth, talc, barite powder, precipitated barium sulfate, barium carbonate; silica sand, gravel, cryolite, glass beads, resin beads, metal particles, or rocks, glass, ceramics, sintered bodies, concrete, mortar, Examples include aggregates such as crushed products such as plastic and rubber. These can be used alone or in combination of two or more.
The mixing ratio of the powder particles is usually about 5 to 95% by weight, preferably about 20 to 90% by weight, based on the entire coating material.

In the present invention, cellulose acetate fibers having a fiber length of 0.01 to 10 mm are used as the fibers. This cellulose acetate fiber is easily compatible with an aqueous coating material and has excellent dispersibility. Moreover, it is hard to generate a bubble bite compared with the conventionally used fiber. Further, in the formed coating film, the strength improvement effect and cracking prevention effect equivalent to or higher than those of the conventional product can be obtained, and the decrease in elongation seen with the conventional product can be improved.
The action mechanism of cellulose acetate fiber in the present invention is not clear, but it is effective that it has appropriate hydrophilicity in chemical composition and that each fiber has a linear and uniform shape. It is guessed.

Although the fiber length of a cellulose acetate fiber is 0.01-10 mm, Preferably it is 0.05-5 mm, More preferably, it is 0.1-1 mm.
The fiber diameter of a cellulose acetate fiber is 1-1000 micrometers normally, Preferably it is 10-500 micrometers, More preferably, it is 10-100 micrometers. When the fiber diameter is too small, the dispersibility is poor and foaming may occur. When the fiber diameter is too large, the effect of preventing foaming may be reduced.

  Cellulose acetate fiber can be produced by a known method. For example, it can be obtained by esterifying cellulose. The esterification degree of cellulose acetate is not particularly limited, but is usually about 1.5 to 3.

As the cellulose acetate fiber in the present invention, it is particularly desirable to use a waste material of a tobacco filter. Use of such waste materials can greatly contribute to resource reuse.
The tobacco filter is used to remove tars in tobacco smoke and maintain the taste, and cellulose acetate fibers are widely used as fiber bundles constituting the filter. When the cigarette filter is manufactured, the remaining cellulose acetate fibers are discharged as waste material.
Such waste cellulose acetate fibers usually have a fiber length of about several centimeters to several tens of centimeters. If these are cut to a length of 0.01 to 10 mm using a known cutting machine such as a rotary cutting machine or a press cutting type cutting machine, they can be used for the aqueous coating material of the present invention. If the fiber length of the waste material itself is within a predetermined range, it can be used as it is.

  As the fiber in the aqueous coating material of the present invention, it is desirable to use only the cellulose acetate fiber having the fiber length as described above, but the fiber length is 0.01 to within the range that does not impair the effects of the present invention. Those other than 10 mm can be mixed and used. Moreover, fibers other than cellulose acetate fiber can be used in combination. Examples of such fibers include pulp fibers, acrylic fibers, polyester fibers, nylon fibers, and carbon fibers.

  The mixing ratio of the fibers is 0.01 to 10% by weight, preferably 0.1 to 3% by weight, based on the entire coating material. When the mixing ratio of the fibers is too large, there is a risk of hindering the painting workability. Further, the stretchability of the formed coating film is insufficient. When the mixing ratio of the fibers is too small, it is not possible to obtain a strength improvement effect, a crack prevention effect, and the like.

  In the aqueous coating material of the present invention, components that can be used in ordinary coating materials can also be included. Such components include, for example, thickeners, film-forming aids, leveling agents, wetting agents, plasticizers, antifreeze agents, pH adjusters, antiseptics, antifungal agents, antialgae agents, antibacterial agents, dispersions Agents, antifoaming agents, ultraviolet absorbers, antioxidants, catalysts, crosslinking agents and the like.

  The aqueous coating material of the present invention can be prepared by mixing the above-described components with a stirrer or the like. In this invention, since the dispersibility of a cellulose acetate fiber is favorable, the effort spent for a dispersion | distribution process can be reduced. Moreover, since it is hard to generate | occur | produce in the dispersion | distribution process, the addition amount of an antifoamer etc. can also be reduced.

The aqueous coating material of the present invention can be suitably used as a thick film type aqueous coating material. Specific examples include concavo-convex pattern-forming coating materials such as lysine, stucco, spray tile, and single-layer elastic coating materials, and groundwork adjusting coating materials such as putty, filler, and surfacer. The aqueous coating material of the present invention is also suitable as a joint treatment material used for joint parts between building materials.
The film thickness of the formed coating film is approximately 1 to 10 mm, although it varies depending on the application. Before painting, water can be mixed as necessary.

  Examples are given below to clarify the features of the present invention. In addition, the cellulose acetate fiber 1 and 2 used for each test are those using waste materials of tobacco filters, the cellulose acetate fiber 1 has an average fiber diameter of 40 μm and an average fiber length of 0.5 mm, and the cellulose acetate fiber 2 has an average. The fiber diameter is 1 μm and the average fiber length is 0.2 mm.

Test I
(1) 2 parts by weight of cellulose acetate fiber 1 is added to 100 parts by weight of a synthetic resin emulsion (acrylic ester-styrene copolymer resin, pH 7.5, solid content 50% by weight), and stirred for 5 minutes with a propeller type stirring blade. did. The specific gravity of the mixture at this time was measured.
Next, 0.2 wt% of a silicone-based antifoaming agent was added to the obtained mixture, and after defoaming for 5 minutes with a rotary defoamer, the specific gravity was measured.
(2) Instead of cellulose acetate fiber 1, cellulose acetate fiber 2 was used, and the specific gravity was measured in the same manner as in (1) above.
(3) Instead of cellulose acetate fiber 1, pulp fiber (average fiber diameter 40 μm, average fiber length 0.5 mm) was used, and the specific gravity was measured in the same manner as in (1) above.

(Test results)
When the appearance before defoaming was observed, the cellulose acetate fiber 1 mixture and the cellulose acetate fiber 2 mixture had higher transparency than the pulp fiber mixture. Moreover, as shown in Table 1, the specific gravity before defoaming of the cellulose acetate fiber 1 mixture and the cellulose acetate fiber 2 mixture was higher than that of the pulp fiber mixture.
From the above results, it was clarified that the cellulose acetate fiber 1 mixture and the cellulose acetate fiber 2 mixture are less prone to foaming than the pulp fiber.

Exam II
(1) Synthetic resin emulsion (acrylic ester-styrene copolymer resin, pH 7.5, solid content 50% by weight) 45 parts by weight, titanium oxide dispersion (titanium oxide 60% by weight) 5 parts by weight, heavy carbonic acid 30 parts by weight of calcium, 15 parts by weight of water, 1 part by weight of a dispersing agent, 3 parts by weight of a film-forming aid, and 1 part by weight of cellulose acetate fiber 1 were added, and the aqueous coating material A was prepared by stirring for 30 minutes with a propeller-type stirring blade. Manufactured.
(2) About the obtained aqueous coating material A, the elongation test at 20 degreeC was done by the method of JIS A6909-2000 7.31 "elongation test".

(3) An aqueous coating material B was produced in the same manner as in the above (1) except that cellulose acetate fiber 2 was used instead of cellulose acetate fiber 1. About the obtained water-based paint B, the elongation test at 20 degreeC was done by the method similar to said (2).

(4) An aqueous coating material C was produced in the same manner as in the above (1) except that pulp fibers (average fiber diameter 40 μm, average fiber length 0.5 mm) were used instead of cellulose acetate fiber 1. About the obtained water-based paint C, the elongation test at 20 degreeC was done by the method similar to said (2).

(5) An aqueous coating material D was produced in the same manner as in the above (1) except that polypropylene fibers (average fiber diameter 40 μm, average fiber length 0.5 mm) were used instead of cellulose acetate fiber 1. About the obtained water-based paint D, the elongation test at 20 degreeC was done by the method similar to said (2).

(6) An aqueous coating material E was produced in the same manner as in the above (1) except that the following synthetic resin emulsion was used instead of the synthetic resin emulsion of (1). About the obtained water-based paint E, the elongation test at 20 degreeC was done by the method similar to said (2).
Cross-linked synthetic resin emulsion: monomer component (styrene, n-butyl acrylate, methyl methacrylate, acrylamide, methacrylic acid, diacetone acrylamide), cross-linking agent (adipic acid dihydrazide), solid content 50% by weight, glass transition temperature 0 ° C.

(Test results)
The test results are shown in Table 2. Water-based coating material A, water-based coating material B, and water-based coating material E mixed with cellulose acetate fiber are equal to or more than water-based coating material C (using pulp fibers) and water-based coating material D (using polypropylene fibers) in tensile strength. While showing the value of, the extensibility was excellent.

Exam III
The obtained water-based coating materials A and E were subjected to the following test.

(Wetting and cooling resistance test)
SK aqueous elastic sealer (synthetic resin emulsion-based primer; manufactured by SK Kaken Co., Ltd.) was applied to a 150 × 70 × 3 mm flexible plate at 0.15 kg / m ² , and the standard condition (23 ° C., 50% RH) After drying for 8 hours, aqueous coating materials A and E were coated at 4.0 kg / m ² and cured for 14 days to prepare test specimens. The prepared specimen was immersed in water at 23 ± 2 ° C. for 18 hours according to JIS K5600-1999 7.4, then immediately cooled in a thermostatic bath maintained at −20 ± 2 ° C. for 3 hours, and then 50 ± 3 The mixture was heated for 3 hours in a separate thermostat kept at ° C. This operation was repeated 10 times, and then placed in a standard state for about 1 hour, and the state of the coating film surface was visually observed. The evaluation is as follows. The test results are shown in Table 3.
○: No crack ×: There is a crack

(Accelerated contamination test)
An SK # 1000 primer (epoxy resin base coat; manufactured by SK Kaken Co., Ltd.) was applied to an aluminum plate of 150 × 75 × 0.8 mm at 0.15 kg / m ² and dried in a standard state for 8 hours. Thereafter, aqueous coating materials A and E were applied at 4.0 kg / m ² and cured for 14 days to prepare test specimens.
The prepared specimen was dried and cured in a standard state for 7 days, and then a 15 wt% carbon black aqueous dispersion paste was dropped onto the coating surface so as to have a diameter of 20 mm and a height of 5 mm in a constant temperature room at 23 ° C. For 2 hours. Thereafter, it was washed in running water, and the degree of contamination of the coating film surface was visually evaluated. The evaluation is as follows. The test results are shown in Table 3.
◎: No trace ○: Almost no trace ×: Trace

Claims (3)

A water-based coating material containing a binder, a granular material, and a fiber as essential components, and containing 0.01 to 10% by weight of the fiber with respect to the entire coating material, the fiber having a fiber length of 0.01 to 10 mm , a fiber An aqueous coating material comprising cellulose acetate fibers having a diameter of 10 to 1000 μm .   The aqueous coating material according to claim 1, wherein the cellulose acetate fiber is a waste material of a tobacco filter. The aqueous coating material according to claim 1 or 2, wherein the binder is a cross-linked binder having a reactive functional group.