JP4819350B2 - Composition for forming a peelable film - Google Patents

Description

  The present invention relates to a releasable film-forming composition that temporarily protects the surface of a structure, etc., can easily remove graffiti and stickers, and is also useful as a decontamination agent for old paint film surfaces and ground surfaces. .

  Graffiti and stickers may be affixed to the surface of outdoor structures such as building outer walls, telephone poles, and telephone boxes without permission. In recent years, there has been an increase in the number of particularly graffiti graffiti and stickers accompanying intense business battles, as well as the increase in ink and paint types and sophistication, and the development of powerful adhesives. Removal is becoming increasingly difficult. As a method for preventing such graffiti and sticker, for example, Patent Document 1 discloses a structure for graffiti countermeasures in which a primer layer, a surface layer, and a peelable layer are formed on the surface of a structure. In this structure manufacturing method, it is necessary to provide a surface layer so that the peelable layer is easily peeled off, and the surface layer is difficult to adhere, so that it is relatively difficult to apply the peelable material. was there.

  In Patent Document 2, a primer layer and a hardly-adhesive surface layer are formed on the surface of a base material of a structure, and after graffiti on the surface layer, a peelable paint is applied on the surface layer. A graffiti removing method is disclosed in which graffiti is removed from the surface of the surface layer by forming a release layer and peeling the peelable layer from the surface layer. Patent Document 3 discloses a peelable coating composition such as an automobile. Water-based paint mainly composed of an acrylic emulsion having a glass transition temperature of 5 to 30 ° C. and a weight average molecular weight in the range of 30,000 to 100,000, which is useful for temporarily protecting the surface of the coated article Is disclosed.

JP 2003-11261 A Japanese Patent Laid-Open No. 11-131022 Japanese Patent Laid-Open No. 9-192593

  However, any of the above-mentioned peelable membranes may remain when disposed of by landfill after use, or the scenery may be damaged if disposed of, and if incinerated, There is a problem that the incinerator may be damaged because of the high calorific value.

  The object of the present invention is biodegradable and does not adversely affect the natural environment even after use, but can be easily peeled off, temporarily protecting the surface of outdoor structures, etc. An object of the present invention is to provide a peelable film-forming composition that can easily remove graffiti and sticker.

The present invention is an aqueous dispersion of the lactic acid-based polymer (A), a plasticizer viscosity of 25 mPa · s or higher at 25 ° C. (B), water-soluble polymer (C) and (6) or more fatty acids or fats carbon (D 1) to 50 parts by weight of the plasticizer (B) with respect to 100 parts by weight of the solid content of the lactic acid-based polymer (A) , and the water-soluble polymer (C) to lactic acid. 0.1 to 10 parts by weight, fatty acid or oil (D) having a carbon number of 6 or more with respect to 100 parts by weight of the solid content of the polymer polymer (A), and 100 parts by weight of the lactic acid polymer (A) and the plasticizer (B). A peelable film-forming composition characterized by containing 0.5 to 30 parts by weight with respect to parts by weight, and a peelable film-forming composition, the peelable film-forming composition Is applied to the surface of the object to be coated to form a peelable film. After forming the peelable film by applying the composition for forming the peelable film to the surface to be coated and forming the peelable film, the dirt and / or graffiti formed on the film is removed together with the peelable film. The method for using the composition for forming a peelable film characterized by comprising: applying the composition for forming a peelable film on a surface to be coated and forming a peelable film; A method for using a composition for forming a peelable film, comprising: removing the attached paper together with the peelable film; and applying the composition for forming a peelable film on a surface to be coated with contaminants. Furthermore, the present invention relates to a method for using a composition for forming a peelable film, characterized in that after the peelable film is formed, the film is peeled to remove contaminants attached to the surface of the object to be coated.

  According to the composition for forming a peelable film of the present invention, a peelable film is provided on the surface of a structure without providing a special lower layer coating film, and even when graffiti or sticker is made on the surface thereof In addition, since the release film after use has biodegradability, it is very useful from the viewpoint of environmental protection.

  The peelable film-forming composition of the present invention is not only used as a temporary protective agent for the interior and exterior surfaces of the building as described above, but also for dust and dirt on the old paint film surface and the ground surface, deteriorated old paint film, mold, It also has excellent performance as a decontamination agent for removing algae, spears, etc., and is very useful during painting work on the interior and exterior surfaces of buildings.

  In the present invention, the aqueous dispersion of the lactic acid-based polymer (A) is blended as a film-forming component, and the lactic acid-based polymer (A) is a biodegradable resin containing lactic acid as a main component. Conventionally known ones can be used without particular limitation. For example, polylactic acid, aliphatic polyesters obtained by copolymerizing lactic acid and other hydroxycarboxylic acids, and the like can be suitably exemplified, and these can be used alone or in combination. .

  Examples of other hydroxycarboxylic acids copolymerizable with lactic acid include glycolic acid; 2-hydroxycaproic acid, 6-hydroxycaproic acid, 2-hydroxy-2-methylcaproic acid, and 2-hydroxy-2-ethylcaproic acid. 2-hydroxybutyric acid, 2-hydroxy-2-methylbutyric acid, 2-hydroxy-2-ethylbutyric acid, 4-hydroxybutyric acid, 2-hydroxyvaleric acid, 2-hydroxy-2-methylvaleric acid, 5-hydroxyvaleric acid 2-hydroxyheptanoic acid, 2-hydroxy-2-ethylheptanoic acid, 2-hydroxy-2-propylheptanoic acid, 2-hydroxy-2-butylheptanoic acid, 2-hydroxyoctanoic acid, 7-hydroxyheptanoic acid, 2 -Hydroxy-2-methyloctanoic acid, 2-hydroxy-2-methylpropion , 3-hydroxypropionic acid, and the like. These may be used alone or in combination of two or more. Of these, glycolic acid and hydroxycaproic acid derivatives are particularly preferred from the viewpoint of finishing the formed film and imparting flexibility.

  The lactic acid-based polymer (A) has a storage stability and a film-forming property in that L-form and D-form are present as lactic acid monomers in the constituent components in a range of 75/25 to 98/2 by weight ratio. Desirable from the viewpoint of sex. Further, it is desirable from the viewpoint of the strength of the formed film that the lactic acid monomer is used in the constituent components in an amount of 60% by weight or more, preferably 80% by weight or more.

  The lactic acid polymer (A) has a weight average molecular weight of 10,000 to 300,000, preferably 100,000 to 250,000 from the viewpoint of the strength of the formed film. Here, the weight average molecular weight was calculated by converting the weight average molecular weight measured by gel permeation chromatography at a flow rate of 1.0 ml / min and a measurement temperature of 40 ° C. based on the weight average molecular weight of polystyrene using tetrahydrofuran as a solvent. Is the time value. “HLC8120GPC” (trade name, manufactured by Tosoh Corporation) can be used for the gel permeation chromatography apparatus, and “TSKgel G-4000H × L”, “TSKgel” are used as columns for solvent gel permeation chromatography. Four pieces of “G-3000H × L”, “TSKgel G-2500H × L”, and “TSKgel G-2000H × L” (both manufactured by Tosoh Corporation) are used.

  The lactic acid polymer (A) can be blended with a hydrolysis inhibitor as necessary in order to suppress hydrolysis during storage or the like. Examples of the hydrolysis inhibitor include compounds having reactivity with carboxylic acid or hydroxyl group, which are terminal functional groups of lactic acid polymers, and more specifically, carbodiimide compounds, isocyanate compounds, oxazoline compounds, and the like. Can be mentioned. Among these, a carbodiimide compound capable of effectively suppressing the hydrolyzability by adding a small amount can be preferably used.

  The carbodiimide compound may be a conventionally known one without particular limitation as long as it has one or more carbodiimide groups in the molecule, and may be oil-soluble or water-soluble. Examples of the carbodiimide compound include monocarbodiimides such as dicyclohexylcarbodiimide, diisopropylcarbodiimide, dimethylcarbodiimide, dioctylcarbodiimide, diphenylcarbodiimide, and the like, and carbodiimide compounds having two or more carbodiimide groups in the molecular chain include aromatic compounds. And a modified polycarbodiimide compound in which an isocyanate group which is a polymerization terminal of a polycarbodiimide compound using an organic diisocyanate compound such as an aliphatic diisocyanate, an aliphatic diisocyanate, and an alicyclic diisocyanate as a synthesis raw material is end-capped with an active hydrogen compound.

  The blending amount of the hydrolysis inhibitor is preferably in the range of 0.1 to 3% by weight with respect to the solid content of the lactic acid-based polymer (A) from the viewpoint of hydrolysis inhibition ability and prevention of gelation.

  The lactic acid-based polymer (A) can be used in combination with other conventionally known resins as a film-forming component, if necessary. Particularly, biodegradable resins other than the lactic acid-based polymer from the viewpoint of biodegradability. It is desirable to use together. Examples of biodegradable resins other than lactic acid-based polymers include polysaccharides such as starch, starch derivatives, cellulose, cellulose derivatives, chitin, chitosan derivatives, curdlan, alginic acid, hyaluronic acid, dextran; gluten, casein, collagen, gelatin , Sericin, keratin, polyglutamic acid, and other polypeptides; cashew resins, shellac, rosin, and other natural resins. These can be used alone or in combination of two or more. These blending amounts are preferably within a range of 30% by weight or less in the total solid content with the lactic acid-based polymer (A) from the viewpoint of the strength and water resistance of the formed coating film.

  The lactic acid polymer (A) can be dispersed in water by a conventionally known method. Usually, an organic solvent solution of the lactic acid polymer (A) is mixed with an anionic surfactant, a cationic surfactant, a nonionic interface. An aqueous dispersion can be prepared by removing the organic solvent after dispersing in water using a water-soluble polymer such as an activator or polyvinyl alcohol as a dispersion stabilizer.

  In the present invention, the plasticizer (B) is blended in order to improve the film forming property by the component (A), and has a viscosity at 25 ° C. of 25 mPa · s or more, preferably 27 to 1000 mPa · s. In particular, a compound having biodegradability is desirable. If the viscosity is less than 25 mPa · s, the plasticizing effect is poor and the film forming property is lowered, which is not preferable. Here, the viscosity of the plasticizer (B) is a value measured at a shear rate (number of rotations) of 60 rpm and 25 ° C. using a B-type rotational viscometer manufactured by Brookfield.

  Examples of the plasticizer (B) include citric acid derivatives such as triethyl citrate, tributyl citrate, acetyl triethyl citrate, and tributyl acetyl citrate; diethylene glycol diacetate, triethylene glycol diacetate, triethylene glycol dipropionate, and the like. Ether ester derivatives of glycerol; glycerol derivatives such as glycerol diacetomonolaurate, glycerol triacetate, glycerol tripropionate, glycerol tributyrate; ethyl phthalyl ethyl glycolate, ethyl phthalyl butyl glycolate, butyl phthalyl butyl glycolate, etc. Phthalic acid derivatives; adipic acid derivatives such as condensates of adipic acid and 1,4-butanediol; polyhydroxys such as polycaprolactone and polypropiolactone Such carboxylic acid and the like, which may be used alone or in combination of two or more. Of these, glycerin derivatives and adipic acid derivatives are particularly preferred because of their high effect of improving film-forming properties.

  Content of the said plasticizer (B) is 1-50 weight part with respect to 100 weight part of solid content of the said lactic acid-type polymer (A), Preferably it exists in the range of 5-45 weight part. If the content is less than 1 part by weight, the film-forming property is lowered and the flexibility of the formed film is inferior. On the other hand, if it exceeds 50 parts by weight, the plasticizer may bleed out from the formed film, which is not preferable.

  Depending on the type of the plasticizer (B), it is desirable that the plasticizer (B) is preliminarily formed into an aqueous emulsion and blended with the aqueous dispersion of the lactic acid polymer (A). The aqueous emulsion can be formed by a method such as mechanical dispersion or dispersion using an emulsifier.

  The composition of the present invention contains the above-mentioned components (A) and (B) as essential components, and is water-soluble for the purpose of improving the coating workability, the peelability of the formed film and the film-forming property as necessary. The polymer (C) can contain a fatty acid having 6 or more carbon atoms or an oil (D) containing the fatty acid as a constituent component for the purpose of improving the film-forming property and improving the film strength.

  The water-soluble polymer (C) has a solubility in water at 25 ° C. of 5 to 100 g / 100 g of water, preferably 7 to 80 g / 100 g of water, from the viewpoint of film forming property and water resistance. It is desirable to have biodegradability. Examples of the water-soluble polymer (C) include polyvinyl alcohol derivatives such as polyvinyl alcohol, carboxy-modified polyvinyl alcohol and sulfonated modified polyvinyl alcohol; cellulose derivatives such as methyl cellulose, carboxymethyl cellulose and hydroxyethyl cellulose; gum arabic, guar gum and xanthan gum Plant gums such as; pullulan and the like. These can be used alone or in combination of two or more.

  The water-soluble polymer (C) is blended in the range of 0.1 to 10 parts by weight, preferably 0.5 to 8 parts by weight, based on 100 parts by weight of the solid content of the lactic acid polymer (A). However, it is preferable from the viewpoints of coating workability, peelability of the formed film, film-forming property, and water resistance.

  The fatty acid or fat (D) is desirably one having 6 or more carbon atoms, preferably 6 to 30. Examples of the fatty acid and fat include castor oil, linseed oil, dehydrated castor oil, tung oil, safflower. Oil, soybean oil, tall oil, sunflower oil, coconut oil, and fatty acids thereof, which may be modified so as to be easily dispersed in water. These may be used alone or in combination of two or more. it can. Content of the said fatty acid or fats and oils (D) is 0.5-30 weight part with respect to 100 weight part of solid content of the said (A) and (B) component, Preferably it exists in the range of 1-25 weight part. From the viewpoint of film-forming property, film strength, and prevention of film adhesion.

  Moreover, when using the said fatty acid or fats and oils (D), in order to accelerate | stimulate the oxidative hardening of the film formed as needed, a metal dryer can be mix | blended. Examples of such metal dryers include salts of at least one metal selected from the group consisting of aluminum, calcium, cerium, cobalt, iron, lithium, magnesium, manganese, zinc, and zirconium with an acid. Examples include capric acid, caprylic acid, isodecanoic acid, linolenic acid, naphthenic acid, neodecanoic acid, octenoic acid, oleic acid, palmitic acid, resin acid, ricinoleic acid, soybean oil fatty acid, stearic acid, tall oil fatty acid, etc. It is done. The blending amount of the metal dryer is 0.01 to 10% by weight, preferably 0.1 to 5% by weight, based on the total blending weight of fatty acid or fat.

  Furthermore, the composition of the present invention preferably contains the pigment (E) from the viewpoint of improving the protective properties such as preventing permeation of graffiti components. Examples of the pigment (E) include colored pigments such as titanium white, carbon black, phthalocyanine blue, and phthalocyanine green; and extender pigments such as talc, calcium carbonate, silica, barium sulfate, clay, and mica. It can be used alone or in combination of two or more.

  The content of the pigment (E) is suitably in the range of 1 to 50 parts by weight, preferably 10 to 30 parts by weight with respect to 100 parts by weight of the resin solid content in the composition of the present invention.

  The composition of the present invention preferably contains a weathering aid (F) comprising an ultraviolet absorber and / or a light stabilizer from the viewpoint of improving the durability of the formed coating when used outdoors for a long period of time.

  A conventionally well-known thing can be used as a ultraviolet absorber. Specific examples thereof include salicylic acid derivatives such as phenyl salicylate, p-octylphenyl salicylate, 4-tert-butylphenyl salicylate; 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2,2′-dihydroxy- 4-methoxybenzophenone, 2-hydroxy-4-methoxy-2'-carboxybenzophenone, 2-hydroxy-4-methoxy-5-sulfobenzophenone trihydrate, 2,2'-dihydroxy-4,4'-dimethoxybenzophenone, 2-hydroxy-4-octoxybenzophenone, 2-hydroxy-4-octadecyloxybenzophenone, sodium 2,2'-dihydroxy-4,4'-dimethoxy-5-sulfobenzophenone, 2,2 ', 4,4' -Tet Lahydroxybenzophenone, 4-dodecyloxy-2-hydroxybenzophenone, 5-chloro-2-hydroxybenzophenone, resorcinol monobenzoate, 2,4-dibenzoylresorcinol, 4,6-dibenzoylresorcinol, hydroxydodecylbenzophenone, 2,2 ′ Benzophenone series such as -dihydroxy-4 (3-methacryloxy-2-hydroxypropoxy) benzophenone; benzotriazole series such as 2- (2'-hydroxy-5'-methylphenyl) benzotriazole and others (oxalide anilide, Cyanoacrylate) and the like.

  Conventionally known light stabilizers can be used. Although mainly hindered amine derivatives, specifically, bis- (2,2 ′, 6,6′-tetramethyl-4-piperidinyl) sebacate, 4-benzoyloxy-2,2 ′, 6,6′-tetramethyl Piperidine and the like are preferred.

  The ultraviolet absorber and the light stabilizer can be used alone or in combination.

  Although the compounding quantity of the said weather resistance adjuvant (F) can be arbitrarily selected according to the objective, 0.1-10 weight part of an ultraviolet absorber is preferable with respect to 100 weight part of resin solid content in a composition, Preferably The appropriate amount is 0.5 to 5 parts by weight, and the light stabilizer is 0.1 to 5 parts by weight, preferably 0.3 to 3 parts by weight.

  Furthermore, the composition of the present invention preferably contains a peeling aid (G) from the viewpoint of imparting appropriate adhesion to the surface to be coated and enabling easy peeling even after long-term use. As the peeling aid (G), at least one compound selected from wax, silicone, fluorine and the like can be suitably used. Any of those dissolved or dispersed in water or powdered can be used. Of these, polyether-modified silicone oil can be preferably used.

  The pigment (E), the weathering aid (F), and the peeling aid (G) are preliminarily made into an aqueous emulsion as necessary, and then blended in the aqueous dispersion of the lactic acid polymer (A). Is desirable. These components can be made into an aqueous emulsion by methods such as mechanical dispersion and dispersion with an emulsifier.

  In the composition of the present invention, if necessary, polymer particles, pigment dispersant, surfactant, surface conditioner, anti-settling agent, antistatic agent, softener, antibacterial agent, perfume, curing catalyst, dispersant, Antifoaming agent, thickener, film-forming aid, preservative, antifungal agent, antifreezing agent, pH adjuster, aldehyde scavenger, humidity control agent, layered viscosity mineral, powdered or fine particle activated carbon, photocatalytic oxidation Titanium or the like can be appropriately blended.

  In the present invention, the peelable film-forming composition of the present invention can be applied to a surface to be coated and dried to form a peelable film, thereby temporarily protecting the surface to be coated. be able to.

  Examples of surfaces to be coated include, for example, building exterior walls, bridge piers, tunnel inner surfaces, surfaces of outdoor structures such as guardrails, utility poles, telephone boxes; automobile vehicles such as two and four wheels, railway vehicles, airplanes, steel furniture, building materials, Examples include the surface of industrial products such as home appliances and kitchen equipment.

  As a coating method, for example, a conventionally known method such as a roller, a brush, or a spray can be used without any particular limitation. The coating film may be dried by heat drying, forced drying, or room temperature drying. In this specification, the drying condition of less than 40 ° C. is room temperature drying, the drying condition of 40 ° C. or more and less than 80 ° C. is forced drying, and the drying condition of 80 ° C. or more is heat drying. Usually, it is desirable to dry at room temperature below about 40 ° C.

  The film thickness of the peelable film is preferably from 30 to 300 μm, preferably from 50 to 200 μm, in terms of dry film thickness, from the viewpoints of securing protection, ease of peeling, and coating workability.

  In the present invention, the composition for forming a peelable film of the present invention is applied to a surface to be coated, such as an outdoor structure, and dried to form a peelable film. Dirt from exhaust gas, cigarettes, etc. and graffiti from lacquers, oily markers, etc. can be easily removed together with the peelable film. In the present invention, the peelable film-forming composition of the present invention is applied to the surface of an object to be coated such as an outdoor structure, and dried to form a peelable film, which is then attached to the film. Can be easily removed together with the peelable coating.

Furthermore, in the present invention, the peelable film-forming composition is applied to the surface of the object to be coated, for example, the old paint film surface or the ground surface of the building structure, dried, and then peeled. By removing the coating, it is possible to remove contaminants (dust / dust, deteriorated old coating, mold, algae, spears, etc.) adhering to the surface of the old coating or the ground surface. As the substrate, mortar, concrete, porcelain tile, stone, brick, cloth, wood and the like can be applied without particular limitation. In this method, when applied to a surface to be coated having large irregularities, it is desirable that the coating amount be 150 g / m ² or more. If it is less than 150 g / m ² , the peelability is poor, and adhesion contamination cannot be sufficiently removed, which is not desirable. For the purpose of removing mold and algae attached to the surface to be coated, a composition comprising a disinfectant may be used as the above-mentioned peelable film forming composition. When the purpose is to remove the above, a composition obtained by blending a surfactant as the above-mentioned peelable film forming composition may be used.

  Hereinafter, the present invention will be described in more detail with reference to examples. “Part” and “%” indicate “part by weight” and “% by weight” unless otherwise specified.

Production Examples 1 to 15 and Comparative Examples 1 to 4 of Composition for Forming a Removable Film
According to the composition shown in Table 1, mixing and stirring were performed to obtain each of the peelable film forming compositions A to S. In Table 1, (Note 1) to (Note 12) are as follows.

(Note 1) Aqueous dispersion of lactic acid polymer (1): Polylactic acid resin (L-form / D-form = 80/20 (weight ratio), weight average molecular weight 140,000, glass transition temperature 52 ° C.) 50 parts toluene 200 20 parts of “Newcol 707SF” (trade name, manufactured by Nippon Emulsifier Co., Ltd., an anionic emulsifier having a polyoxyethylene chain, active ingredient 30%) is added to the solution dissolved in a part, and 55 parts of water is added under stirring with a homodisper. After gradually adding and emulsifying, toluene was removed under reduced pressure to obtain an aqueous dispersion (1) of a lactic acid polymer having a solid content of 50% and a particle size of 870 nm.

  Here, the glass transition temperature was measured by a differential scanning calorimetry method (DSC) according to JIS K7121.

(Note 2) Aqueous dispersion of lactic acid polymer (2): Aliphatic polyester resin copolymerized with 92 mol% of L-lactic acid and 8 mol% of 2-hydroxy-2-methylcaproic acid (weight average molecular weight 170,000, glass transition A lactic acid polymer aqueous dispersion (2) having a solid content of 50% and a particle size of 1200 nm was obtained in the same manner as in the lactic acid polymer aqueous dispersion (1) except that the temperature was 27 ° C.

(Note 3) “Primal AC-264”: trade name, manufactured by Rohm and Haas, acrylic emulsion with a solid content of 60.5%, glass transition temperature of acrylic at 18 ° C.
(Note 4) “Riquemar PL-019”: trade name, manufactured by Riken Vitamin Co., Ltd., glycerin diacetomonolaurate, viscosity at 25 ° C. 31 mPa · s, plasticizer (Note 5) “Adekasizer D-55”: trade name, Asahi Denka Kogyo Co., Ltd., Epoxidized Fatty Acid Alkyl Ester, Viscosity 19 mPa · s at 25 ° C., Plasticizer (Note 6) “Inagel V-10K”: Ina Food Industry Co., Ltd., xanthan gum, water solubility at 25 ° C. is about 40g / 100g water
(Note 7) “SN Deformer 380”: trade name, manufactured by San Nopco, defoaming agent (Note 8) “Suraoff 72N”: trade name, manufactured by Takeda Pharmaceutical Company Limited, preservative

(Note 9) Titanium white paste: Titanium oxide (trade name “Titanium CR-95”, manufactured by Ishihara Sangyo Co., Ltd.) 560 parts, 12 parts of a 40% aqueous solution of polycarboxylic acid sodium salt and 160 parts of water were added and stirred well. Dispersed to a particle size of 10 microns or less with a sand mill disperser to obtain a titanium white paste.

(Note 10) Peeling aid: 30 parts of modified silicone oil “TSF4445” (manufactured by Toshiba Silicone Co., polyether-modified silicone oil), 2 parts of polyoxyethylene sorbitan monooleate and 68 parts of water are added and stirred well to obtain a solid content. An aqueous dispersion of 30% silicone oil was obtained.

(Note 11) Ultraviolet absorber: 5 parts of polyoxyethylene sorbitan monooleate and 65 parts of water were added to 30 parts of “Tinuvin 1130” (manufactured by Ciba Specialty Chemicals Co., Ltd., benzotriazole derivative), and stirred well. An aqueous dispersion of an ultraviolet absorber was obtained.

(Note 12) Light stabilizer: “Sanol LS-292” (manufactured by Sankyo Co., Ltd., hindered amine derivative), 5 parts of polyoxyethylene sorbitan monooleate and 45 parts of water are added and stirred well, and light with a solid content of 50% An aqueous dispersion of stabilizer was obtained.

Formation of peelable coating Examples 16-30 and Comparative Examples 5-8
The composition A to S for forming the peelable film of Examples and Comparative Examples obtained as described above was used on the following three kinds of test plates, respectively, so that the dry film thickness was about 100 μm. And dried under conditions of an air temperature of 20 ° C. and a relative humidity of 60% to obtain three types of test coated plates.

Test plate (1): “VP sealer transparent” (manufactured by Kansai Paint Co., Ltd., vinyl chloride resin-based transparent sealer) was brushed on the slate plate so that the coating amount was 120 g / m ² , the temperature was 20 ° C., and the relative humidity was 60 %, Dried for 2 hours, then brushed with “Arescera Acrylic” (manufactured by Kansai Paint Co., Ltd., acrylic resin-based top coat) to a coating amount of 100 g / m ² , left for 6 hours, and then the same The coating was applied with a brush so that the coating amount was 100 g / m ² and dried for 10 days under the conditions of an air temperature of 20 ° C. and a relative humidity of 60% to obtain a test plate (1).

  Test plate (2): Aminoalkyd resin paint (manufactured by Kansai Paint Co., Ltd.) on mild steel plate (thickness 0.7 mm) surface-treated with “Palbond 3050” (trade name, zinc phosphate surface treatment agent, manufactured by Nihon Parkerizing Co., Ltd.) The product name “Amirac”) was applied to a dry film thickness of about 20 μm, and baked at 140 ° C. for 30 minutes to obtain a test plate (2).

  Test plate (3): Vinyl chloride plate

Evaluation test The above-described compositions for forming a peelable film A to S were evaluated according to the following criteria. The results are shown in Table 2.

  (* 1) Film forming property: Using a doctor blade on the test plate (1), each peelable film forming composition was applied so that the dry film thickness was 100 μm, and the temperature was 20 ° C. and the relative humidity was 60%. The film forming property was confirmed under the conditions described above, and the evaluation was performed according to the following criteria.

○: No abnormality. A uniform continuous film is formed. Δ: Abnormal cracks are observed in less than 30% of the coated surface. ×: Abnormal cracks are observed in 30% or more of the coated surface.

  (* 2) Peelability (initial): Each peelable film-forming composition was applied onto each of the above three test plates using a doctor blade so that the dry film thickness was about 100 μm. It was dried for 1 day under conditions of 20 ° C. and 60% relative humidity. The obtained film was cut at a width of 30 mm with a cutter at the same temperature, and the film was peeled off at a speed of 1 m / 30 seconds.

A: It can be peeled off very easily. ○: It can be peeled off easily.

  (* 3) Peelability (accelerated weather resistance): Each peelable film-forming composition was applied on each of the above three types of test plates using a doctor blade so that the dry film thickness was about 100 μm. The film was dried for 7 days under the conditions of an air temperature of 20 ° C. and a relative humidity of 60%, and the obtained film was irradiated for 150 hours in accordance with the accelerated weathering test of 7-7 (xenon lamp method) of JIS K 5600. Then, the ease of peeling was tested under the condition of a temperature of 20 ° C. in the same manner as (* 2).

  (* 4) Protective property (graffiti): Each test coated plate was prepared in the same manner as in (* 2) above, and graffiti was applied on the resulting coating, which was further left for 1 day. Thereafter, the coating was peeled off, and the presence or absence of graffiti marks on each test plate was visually observed. Graffiti was applied by spraying a commercially available solvent-type black lacquer spray from a position about 25 cm away for 3 seconds.

○: No abnormality △: Some graffiti marks remain ×: Graffiti marks remain or cannot be removed

  (* 5) Protective property (attached paper): Each test coated plate was prepared in the same manner as in (* 2) above, and the attached paper was applied on the obtained coating, and was further left for 1 day. Thereafter, the coating was peeled off, and the presence or absence of a sticker mark on each test plate was visually observed. The paste was applied by applying a B5 size coated paper printed in color using a commercially available spray paste (trade name, spray paste 77, manufactured by Sumitomo 3M).

○: No abnormality △: A little sticky paper mark remains ×: A sticky paper mark remains or cannot be removed

  (* 6) Tobacco dust removal property: Put each test plate (1) to (3) in a 9-liter desiccator, ignite a predetermined number of cigarettes (trade name, highlight), and burn them. Yani was attached to the surface. Thereafter, the peelable film-forming composition was applied to the spear adhesion surface of each test plate using a doctor blade so that the dry film thickness was about 100 μm, and the temperature was 20 ° C. and the relative humidity was 60%. After drying for 7 days under the above conditions, each film was peeled off, visually observed for the presence or absence of stains on each test plate, and evaluated according to the following criteria.

○: No spider remains △: Part of spear remains ×: Spear remains or cannot be removed

  (* 7) Biodegradability: Each composition for forming a peelable film was applied to a polypropylene plate with a doctor blade so that the dry film thickness was about 100 μm, and the temperature was 20 ° C. and the relative humidity was 60. After being allowed to stand for 7 days in a% atmosphere, the coating was peeled off from the plate to obtain each test piece (coating). The obtained test piece was sandwiched between two polypropylene nets, buried in soil of a site depth of 50 cm in Kansai Paint Co., Ltd. in Hiratsuka City, Kanagawa Prefecture, and evaluated visually after 6 months.

○: The test piece has completely disappeared. Δ: 60% or more of the test piece has disappeared. ×: The test piece has completely remained.

Claims (11)

Contains an aqueous dispersion of a lactic acid-based polymer (A), a plasticizer (B) having a viscosity at 25 ° C. of 25 mPa · s or more, a water-soluble polymer (C), and a fatty acid or fat (D) having 6 or more carbon atoms A composition for forming a film, wherein the plasticizer (B) is 1 to 50 parts by weight based on 100 parts by weight of the solid content of the lactic acid polymer (A) , and the water-soluble polymer (C) is a lactic acid polymer (A). ) 0.1 to 10 parts by weight with respect to 100 parts by weight of the solid content of fatty acid or fat (D) having 6 or more carbon atoms with respect to 100 parts by weight of the solid content of the lactic acid-based polymer (A) and the plasticizer (B). The composition for peelable film formation characterized by containing 0.5-30 weight part . The composition for forming a peelable film according to claim 1, wherein the lactic acid polymer (A) is polylactic acid. The composition for forming a peelable film according to claim 1, wherein the lactic acid polymer (A) is an aliphatic polyester obtained by copolymerizing lactic acid and another hydroxycarboxylic acid. The composition for forming a peelable film according to any one of claims 1 to 3 , further comprising a pigment (E). Furthermore, the composition for peelable film formation of any one of Claim 1 thru | or 4 which contains a weather resistance auxiliary | assistance (F). Furthermore, the composition for peelable film formation of any one of Claim 1 thru | or 5 containing peeling adjuvant (G). A method for forming a peelable film, comprising: applying a peelable film forming composition according to any one of claims 1 to 6 to a surface to be coated to form a peelable film. The method of forming a peelable film according to claim 7 , wherein the peelable film has a dry film thickness of 30 to 300 μm. The composition for forming a peelable film according to any one of claims 1 to 6 is applied to a surface to be coated, and after forming the peelable film, dirt and / or formed on the film A method of using a composition for forming a peelable film, wherein the graffiti is removed together with the peelable film. The peelable film forming composition according to any one of claims 1 to 6 is applied to the surface of the object to be coated, and after the peelable film is formed, an adhesive paper affixed on the film is applied. A method for using a composition for forming a peelable film, which is removed together with the peelable film. The peelable film-forming composition according to any one of claims 1 to 6 is applied to the surface of the object to be contaminated, and after the peelable film is formed, the film is peeled off. And removing the contaminants adhering to the surface of the object to be coated.