KR100498717B1 - Peelable coating agent - Google Patents

Abstract

It is an object of the present invention to provide a peelable coating water-based dispersion which exhibits excellent adhesion, water resistance, and protection during the temporary protection period of the substrate, which can be easily peeled off by hand at the end of the protection period, and forms a protective film having excellent weather resistance. do.

The peelable coating water dispersion of the present invention comprises (a) 40 wt% or less of an acrylic copolymer emulsion having a glass potential point (Tg) of 40 ° C. or higher and 5 wt% or more of the acrylic copolymer emulsion, and a Tg 5 ° C. to -20 ° C. 60 weight of an acrylic copolymer emulsion. At least 95% by weight of a mixture; (b) contains 0.5 to 1.0 weight percent of an acid group-containing vinyl monomer in the mixture; (c) at least one of the acrylic copolymer emulsions to be mixed is an acrylic copolymer polymerized using a reactive surfactant; The particle diameter of the acrylic copolymer emulsion (d) is 100 nm or less.

Description

Peelable Coating Aqueous Products

The present invention relates to a water strippable coating water dispersion for the purpose of temporary storage of an article, for example for temporary storage at the time of distribution of the article, for example, temporarily when stored outdoors or when exposed to the outdoors.

For example, automobiles, vehicles, mechanical parts, metal household goods, and other ferrous and nonferrous metal products, woodworking, glassware, rubber products, and their coatings (hereinafter referred to as 'goods') are delivered to the consumer's hands. It is often transported from the place of manufacture or temporarily stored outdoors.

In such cases, during the period of delivery of these items to the consumer's hands (usually about 2 to 12 months), for example, sand dust, iron, salts, alkalis, acids, soot and insects Injuries, stains, discoloration, contamination, etc. are likely to occur on their surfaces due to deposits such as body fluids, worms, and the like, and sunlight, weather, and other influences. In addition, there may be a case in which the trauma occurs to the material by the physical force.

As a result, the merchandise value of the article may be lowered. Therefore, it is necessary to quickly remove the deposits, but it is cumbersome to remove the deposits, and the costs are accompanied.

Therefore, by temporarily protecting the surface of the article from the deposits, sunlight, wind, trauma, etc., and eliminating the need for the cumbersome work and the costs associated with them, the surface of the article is applied to the surface of the article in advance in the shipping step of the product, Numerous peelable coating compositions have been proposed that can be easily peeled off after storage of the desired period.

For example, as a peelable coating composition for automobile exterior use, a so-called oily wax form in which paraffin wax is dispersed in a petroleum solvent and a mixture of calcium carbonate powder in paraffin wax are dispersed in a petroleum solvent have.

However, they need to use petroleum-based solvents for removal, which is a concern for environmental problems such as air pollution. In addition, although a form mainly composed of alkali-soluble resin is used, there is also a problem of environmental pollution such as water pollution because it requires an alkaline detergent to remove.

Therefore, the coating composition of the emulsion system which peels a film by hand after completion | finish of a protection objective which can solve such a problem is proposed (for example, see Japanese Unexamined-Japanese-Patent No. 50-39685, 44-29593, etc.).

However, the above-mentioned proposal of the emulsion-based coating composition has the following problems.

(1) According to the coating composition disclosed in Japanese Unexamined Patent Publication No. 50-39685, since it is formed by using a single raw material, a high temperature range of about 40 ° C in a low temperature range of around 5 ° C, for example, is usually used. There existed a fault in peelability in the wide range up to. That is, there is a problem that the low temperature is cut off during peeling, and the high temperature increases the coating and cannot be peeled off quickly.

(2) A coating composition obtained by emulsion polymerization of acrylonitrile and acrylic acid ester of lower alkyl in water is proposed in Japanese Unexamined Patent Publication No. 44-29593.

However, there is a problem that, as the acrylic resin water dispersion, which has acrylonitrile as essential, incineration of the coating film which is not used after peeling, generates harmful nitrogen oxides, which is a factor of environmental pollution.

On the other hand, as a peelable coating composition for automobile exterior use, it has appropriate adhesion and is not easily peeled off in the water resistance test, and peeling does not occur during transportation while the vehicle is protected, and is easily damaged when the protection period is completed. The emergence of the formation of the protective film which has the excellent adhesive function which is double-rate-cut that it can peel off is desired.

(Means to solve the task)

MEANS TO SOLVE THE PROBLEM In order to solve the said subject, the present inventor earnestly studied to obtain the dispersion composition which does not contain the vinyl monomer containing a nitrogen element. As an acrylic copolymer emulsion, (1) emulsion copolymer of two other types of specific glass transition points is mentioned. And (2) the acid value in the mixture is not more than a predetermined amount, and (3) the emulsion is free of monomers containing nitrogen elements. Came to complete.

Further, in addition to the above ① to ③, ④ is polymerized using a reactive surfactant to at least one or more of the emulsion, and ⑤ the water resistance is further improved by making the particle size of the emulsion within a predetermined range, and thus peeling with excellent adhesion. The present invention has been accomplished by finding that a waterborne coating aqueous product is obtained.

Based on this knowledge, the 1st peelable coating agent water dispersion which concerns on this invention is

(a) Glass transition point (hereinafter referred to as 'Tg') 40% by weight or more of the acrylic copolymer emulsion at 40 ° C or more, 5% by weight or more, and 60% to 95% by weight of the acrylic copolymer emulsion at Tg 5 ° C to -20 ° C. The following mixtures;

(b) the acid group-containing vinyl monomer in the mixture of the acrylic copolymer emulsion of (a) does not contain 2.0% by weight or more as a total amount; Also

(c) The acrylic copolymer emulsion of (a) is characterized in that it does not contain a nitrogen element-containing vinyl monomer as a monomer.

In addition, the second peelable coating agent water dispersion of the present invention,

In addition to the requirements of (a) to (c) above,

(d) at least one of the mixed acrylic copolymer emulsions is an acrylic copolymer polymerized using a reactive surfactant; Also

(e) The acrylic copolymer emulsion has a particle diameter of 200 nm or less.

(Embodiment of invention)

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described.

The peelable coating agent water dispersion according to the first embodiment of the present invention is particularly limited by being an acrylic copolymer emulsion having the properties shown in the following (a) to (c), and each of these properties overlaps each other. The synergistic effect has excellent water resistance, adhesion, protection and weather resistance at the time of protection as shown in the following example, and from low temperature (about 5 ° C) to high temperature (about 40 ° C) after the end of protection. It can have excellent peelability in a wide range, and when incinerated the coating film after use, it does not generate nitrogen oxides, so that there is no influence of environmental pollution.

(a) Glass potential point (hereinafter, referred to as 'Tg') 40% by weight or less of the acrylic copolymer emulsion at 40 ° C or more and 5% by weight or more and 60% by weight or more and 95% by weight of the acrylic copolymer emulsion at Tg 5 ° C to -20 ° C. The following is a mixture.

(b) The acid group-containing vinyl monomer in the mixture of the acrylic copolymer emulsion of (a) does not contain 2.0% by weight or more as a total amount.

(c) The acrylic copolymer emulsion of (a) does not contain nitrogen elements such as nitriloacryl as a monomer.

The peelable coating agent water dispersion according to the second embodiment of the present invention overlaps each of these properties by adding the following requirements (d) and (e) in addition to the requirements of (a) to (c). By the synergistic effect of the above-mentioned range, as shown in a later example, excellent water resistance, adhesiveness, etc. are exhibited favorably at the time of protection.

(d) At least one or more of the acrylic copolymer emulsions to be mixed with (a) is an acrylic copolymer polymerized using a reactive surfactant.

(e) The particle size of the acrylic copolymer emulsion of (a) is 200 nm or less.

As the acrylic copolymer emulsion in the present invention, for example, one or two or more kinds of alkyl acrylate esters and / or one or two or more kinds of alkyl methacrylate esters and vinyl acetate or hydroxyethyl acrylate and hydroxyethyl Hydroxyl group-containing vinyl monomers such as methacrylate, hydroxypropyl acrylate, hydroxypropyl methacrylate, and aryl alcohol, epoxy group-containing vinyl monomers such as glycidyl acrylate and glycidyl methacrylate; Copolymer emulsions with one or two or more kinds of vinyl monomers copolymerizable with the alkylacrylic acid esters and / or alkylmethacrylic esters of aromatic vinyl monomers such as dimethyl styrene, ethyl styrene, butyl styrene and benzyl styrene; Or one or two or more copolymer emulsions of carboxyl group-containing vinyl monomers such as acrylic acid, methacrylic acid, itaconic acid, citraconic acid and crotonic acid and vinyl monomers copolymerizable with the acrylic acid ester and / or methacrylic acid ester. However, the present invention is not limited to these.

However, the acrylic copolymer emulsion contains nitrogen elements such as aminoalkyl acrylates such as acrylonitrile, diethylaminoethyl acrylate, aminodimethyl acrylate, cyanoethyl acrylate, and isocyanate adducts as monomers. Vinyl monomers are excluded.

As a result, nitrogen oxides are not generated when the used coating film is incinerated, and thus, environmental pollution and the like are not affected.

In the present invention, a mixture of two kinds having different Tg ranges of the acrylic copolymer emulsion is used, and the range is a mixture of an acrylic copolymer emulsion having a Tg of 40 ° C. or higher and an acrylic copolymer emulsion having a Tg of 5 ° C. to -20 ° C. to be.

In addition, the combination of both of the Tg 40 ℃ or more of the acrylic copolymer emulsion 40% by weight or less 5% by weight or more, and the Tg 5 ℃ to -20 ℃ acrylic copolymer emulsion of 60% to 95% by weight of the compound It is preferable.

Furthermore, it is preferable to mix | blend the thing of 35 weight% or less and 10 weight% or more of acrylic copolymer emulsion of Tg 40 degreeC or more, and the thing of 65 weight% or more and 90 weight% or less of acrylic copolymer emulsion of Tg 5 degreeC --20 degreeC. .

In addition, the blend of the acid group-containing vinyl monomer contained in the acrylic copolymer emulsion mixture system does not contain 2.0% by weight or more, that is, contains 2.0% by weight or less, preferably 0.2% by weight to 0.8% by weight of the total amount of the mixture. will be.

This is because when the amount of the acid group-containing vinyl monomer is more than 2.0% by weight, the water resistance of the coating film is deteriorated, adhesion strength is increased, and heat resistance and weather resistance are not likely to be peeled off, which is not preferable.

Here, as the acid group-containing vinyl monomer, carboxyl group-containing vinyl monomers such as acrylic acid, methacrylic acid, itaconic acid, citraconic acid, and crotonic acid may be exemplified among the constituents of the acrylic copolymer emulsion described above. It is not limited to.

In the present invention, the reactive surfactant includes, for example, the 'Akron RN' series (brand name: manufactured by Jeil Industry Co., Ltd.), which is a nonionic surfactant of a polyoxyethylene alkylphenyl ether type in which a radical polymerizable propenyl group is introduced into a hydrophobic group. `` Acron HS series '', an anionic surfactant based on the sulfate ester salt thereof (product name: manufactured by Cheil Industries), `` Ereminol RS30 '' and `` Ereminol JS-2 '' (acrylic type) Dayang Chemical Co., Ltd.) and Adecaria Sove series (trade name: Ukteuk Industries, Inc.). The reason for adding the reactive surfactant here is to use the reactive surfactant in synthesizing the acrylic copolymer emulsion, to improve the water resistance of the coating, to improve the coating film strength, and to improve the peelability of the coating.

Moreover, as a particle size of an acrylic copolymer emulsion, 200 nm or less is preferable, More preferably, it is 100 nm or less. This is because when the particle diameter is 200 nm or more, since the adhesion area with the surface of the workpiece to be coated is not sufficient, high water resistance cannot be obtained and is not preferable.

The mixture contains a small amount of plasticizer (phthalic acid esters, fatty acid esters, etc.), wax emulsion (polyethylene, polypropylene, etc.), antifoaming agents (mineral oils, silicones, etc.), thickeners (inorganic, organic, etc.), ultraviolet rays as necessary. Absorbents (benzotriazoles, benzophenones, etc.), pH adjusters (organic alkalis, ethanolamines, etc.), preservatives (benzoisothiazoline, triazines, etc.), film preparations (alkyl ethers of mono or diethylene glycol, Peelable coating agents such as alkyl ethers of mono or dipropylene glycol, etc.), cryoprotectants (such as polyhydric alcohols), peeling enhancers (such as silicone emulsions and alkyl phosphate esters), and drying accelerators (such as lower alcohols such as ethyl alcohol). Various additives contained can be added.

The peelable coating agent of the present invention is applied to the surface of, for example, automobiles, vehicles, machine parts, metal household articles and other ferrous and nonferrous metal articles, woodworking articles, glass articles, rubber articles, and painted articles thereof, in the outdoors and indoors. Although the protection is aimed at, of course, you may use it for things other than these for the purpose of surface protection.

Specifically, ① painting on the outer surface of automobiles and resins to prevent contamination, to prevent trauma or to deteriorate from ultraviolet rays, ② to prevent pollution such as rust on machinery parts, and ③ to contaminate cooking oil or hand oil on ventilation fans and kitchen appliances. For prevention, ④ For aluminum fences, for prevention of contamination or trauma, ⑤ For indoor floors, for prevention of contamination or trauma, ⑥ For storage of materials from paint scattered on walls or floors within the paint booth, and ⑦ FRP Resin skis are effective in preventing trauma or maintaining aesthetic appearance.

(Example)

Although the Example which shows the effect of this invention below is demonstrated with a comparative example, this invention is not limited to this.

This example prepared an emulsion of Tg and particle size shown in the following 'Table 1' to 'Table 3' and provided to the test of Examples 1 to 9 and Comparative Examples 1 to 3.

In addition, the glass potential point (Tg) was measured according to JIS K7121 "Method of measuring the transition temperature of plastics".

① Tg 40 ℃ or more acrylic copolymer emulsion Tg (℃) Particle size (nm) Emulsifier Acid group-containing monomer WT% Al 58 80 Responsive 0.6 A2 58 80 Non-reactive 0 B1 46 75 Responsive 0.8 B2 46 75 Responsive 5.0 C 46 250 Responsive 0.5 D 46 100 Non-reactive 0.1

① Tg 40 ℃ or more acrylic copolymer emulsion

② Tg 5 ℃ to -20 ℃ acrylic copolymer emulsion Tg (℃) Particle size (nm) Emulsifier Acid group-containing monomer WT% Fl 2 85 Responsive 0.4 F2 2 85 Responsive 0 G 2 300 Responsive 0.5 H 2 250 Non-reactive 0.7 I -15 80 Responsive 0.7

② Tg 5 ℃ to -20 ℃ acrylic copolymer emulsion

③ Tg 40 ℃ to 5 ℃ acrylic copolymer emulsion Tg (℃) Particle size (nm) Emulsifier Acid group-containing monomer WT% E 15 80 Responsive 0.5

③ Tg 40 ℃ to 5 ℃ acrylic copolymer emulsion

④ Synthesis method of emulsion

<Emulsion A1>

1.25 parts of ammonium persulfate and 250 parts of water, and the reactive emulsifier 'Akron RN-20' in a glass reaction vessel equipped with a reflux cooler, agitator, thermometer, dropping lot, and gas introduction pipe. 1.8 parts, 25 parts of methyl methacrylate (MMA), 23 parts of butyl acrylate (BA), 2.3 parts of acrylic acid (AA) and 0.9 part of t-dodecylmercaptan were added, and the reaction vessel was nitrogen-substituted under stirring. And warmed in a water bath (60 ° C. holding).

After the liquid temperature reached 60 ° C., 8.2 parts of the 'acron RN-20', 112.5 parts of the methyl methacrylate (MMA), 102 parts of the butyl acrylate (BA), 10.2 parts of the acrylic acid (AA), t A monomer mixture consisting of 3.9 parts of dodecylmercaptan and 32 parts of a 2% by weight aqueous solution of sodium hydrogen sulfite were added dropwise over 2 hours.

After completion of dropping, the system was stirred at 60 ° C for 2 hours.

After the reaction was completed, the mixture was cooled to obtain a thermoplastic resin emulsion having a solid content of 48% and a pH of 3.2.

The system was neutralized with aqueous ammonia again to give a stable emulsion A1. When this emulsion was measured by Tg according to JIS K7121, it showed 58 degreeC, and when the particle diameter was measured by the particle size measuring device, it was an average particle diameter of 80 nm.

<Emulsion B1, B2, C, E, F1, F2, G, I>

The emulsion of B1, B2, C, E, F1, F2, G, and I having different average particle diameters was obtained by stirring in the same manner as in the emulsion A1 and changing the proportion of each monomer to change the amount of emulsifier.

<Emulsion A2, D, H>

In addition, in the case of emulsions A2, D and H using a non-reactive emulsifier, an emulsifier ('Triton X-301' (trade name: manufactured by Romu & Haas)), an initiator, and water were added at the beginning to reach a liquid temperature of 60 ° C. Was synthesized by the slow addition of a mixture and a terminator.

Using the emulsions A to I, the compositions of Examples and Comparative Examples were obtained by the following formulation.

(Example 1)

combination Emulsion D 35 parts by weight Emulsion H 63 parts by weight Antifoam 0.4 Thickener 0.1 MFT (Minimum Film Temperature) = 12 ℃ pH regulator 1.5 Acid group-containing monomer amount 0.49% by weight

(Example 2)

combination Emulsion C 37 parts by weight Emulsion G 59 parts by weight Antifoam 0.5 Thickener 0.1 Peeling Enhancer 1.0 MFT = 5 ℃ pH regulator 1.4 Acid group-containing monomer amount 0.50 wt% Preparation 1.0

(Example 3)

combination Emulsion D 35 parts by weight Emulsion F 63 parts by weight Antifoam 0.4 Thickener 0.1 MFT = 12 ℃ pH regulator 1.5 Acid group-containing monomer amount 0.16% by weight

(Example 4)

combination Emulsion A2 30 parts by weight Emulsion F2 67 parts by weight Antifoam 0.5 Thickener 0.1 Peeling Enhancer 1.0 MFT = 12 ℃ pH regulator 1.4 Acid group-containing monomer amount 0% by weight

(Example 5)

combination Emulsion B2 37 parts by weight Emulsion F2 60 parts by weight Antifoam 0.4 Thickener 0.1 MFT = 10 ℃ pH regulator 1.5 Acid group-containing monomer amount 1.94 wt% Preparation 1.0

(Example 6)

combination Emulsion A 30 parts by weight Emulsion I 68 parts by weight Antifoam 0.4 Thickener 0.1 MFT <0 ℃ pH regulator 1.5 Acid group-containing monomer amount 0.67% by weight

(Example 7)

combination Emulsion B 37 parts by weight Emulsion I 60 parts by weight Antifoam 0.5 Thickener 0.1 Peeling Enhancer 1.0 MFT <0 ℃ pH regulator 1.4 Acid group-containing monomer amount 0.74 wt%

(Example 8)

combination Emulsion B 25 parts by weight Emulsion F 73 parts by weight Antifoam 0.4 Thickener 0.1 MFT = 7 ℃ pH regulator 1.0 Acid group-containing monomer amount 0.35% by weight Peeling Enhancer 0.5

(Example 9)

combination Emulsion D 20 parts by weight Emulsion I 77 parts by weight Antifoam 0.5 Thickener 0.1 Peeling Enhancer 1.0 MFT <0 ℃ pH regulator 1.4 Acid group-containing monomer amount 0.58% by weight

(Comparative Example 1)

combination Emulsion A 48 parts by weight Emulsion F 48 parts by weight Antifoam 0.4 Thickener 0.1 MFT = 10 ℃ pH regulator 1.5 Acid group-containing monomer amount 0.50 wt% Preparation 2.0

(Comparative Example 2)

combination Emulsion B2 36 parts by weight Emulsion F 59 parts by weight Antifoam 0.4 Thickener 0.1 MFT <0 ℃ pH regulator 1.5 Acid group-containing monomer amount 2.34 wt% Preparation 2.0

(Comparative Example 3)

combination Emulsion E 98 parts by weight (Tg: 15 ° C) Antifoam 0.4 Thickener 0.1 MFT = 12 ℃ pH regulator 1.5 Acid group-containing monomer amount 0.5% by weight

(Test Items and Test Methods)

<Production of test piece>

The test piece used for this test was sprayed with an amino alkyd resin-based paint on an electrodeposited mild steel sheet, sprayed with an acrylic resin clear paint at the point of time of drying, and baked at 140 ° C. for 20 minutes. It was set as the paint plate. Moreover, what apply | coated the compound described in the said Example and the comparative example to this coating plate so that dry film thickness might be 70 micrometer was made into the test piece, and the following test was done.

* Peelability Test: The test piece was checked for peelability under respective temperatures of 5 ° C, 25 ° C and 40 ° C.

* Acid resistance test: Small amount of 40% sulfuric acid was dripped on the test piece, and it left to stand in a 60 degreeC thermostat for 15 minutes. After cooling to room temperature, the coating film is peeled off and the change of coating is observed.

* Alkali test: A small amount of 0.1 hydroxide of sodium hydroxide was dripped on the test piece, and it was left to stand at 70 degreeC for 3 hours. After cooling to room temperature, the coating film is peeled off and the change of coating is observed.

* Water resistance test: The film-formed test piece was immersed in 25 degreeC water for 24 hours, and the whitening degree of a coating film is observed.

* Adhesive test: The test film formed coating film is immersed in 25 degreeC water for 24 hours, and the presence or absence of the natural peeling of a coating film is observed.

* Heat release resistance test: After leaving a test piece for 500 hours in 80 degreeC thermostat, peelability is confirmed at room temperature.

* Accelerated weathering test: The test piece is accelerated to deteriorate for 500 hours with a SWOM tester, and then the peelability is checked.

* Cyclic test: The test piece is checked for peelability after 10 cycles after 24 hours at 80 ° C, followed by 24 hours at 0 ° C.

* Outdoor exposure test: The test piece is exposed outdoors in Okinawa Prefecture, Japan, to confirm peelability after 6 months (including 3 months in summer).

* Combustion test: Nitrogen oxides contained in a small amount of stripped coating film and burned gas are analyzed by JIS K0104.

Their test results are shown in Table 4.

In evaluation, very good thing (circle), good thing (circle), bad thing (triangle | delta), and very bad thing were made into x.

Test result Example Comparative example One 2 3 4 5 6 7 8 9 One 2 3 A Peelability Test ◎ ○ ◎ ◎ ◎ ◎ ◎ ◎ ◎ × × × B Acid resistance test ○ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ○ ◎ C Alkali resistance test ○ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ × ◎ D Water resistance test ○ ○ ○ ○ ◎ ◎ ◎ ◎ ◎ ◎ ○ ◎ E Adhesion Test ○ ◎ ○ ○ ◎ ◎ ◎ ◎ ◎ ◎ ○ ◎ F Heat Peeling Resistance Test ◎ ○ ◎ ○ ◎ ◎ ◎ ◎ ◎ △ × △ G Accelerated weathering test ◎ ○ ○ ○ ◎ ◎ ◎ ◎ ◎ △ × × H Periodic test ○ ◎ ○ ○ ◎ ◎ ◎ ◎ ◎ × × △ I Outdoor exposure test ○ ◎ ○ ○ ◎ ◎ ◎ ◎ ◎ × × ○ J Combustion test ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ MFT (℃) 12 5 12 12 10 <0 <0 7 <0 10 <0 12 Mixed bowler 0.49 0.5 0.16 0 1.94 0.67 0.74 0.35 0.58 0.5 2.34 0.5 Emulsion particle size 100/250 250/300 100/85 80/85 75/85 80/80 75/85 75/85 100/85 80/85 75/85 80 Surfactants baboon Half / half B / half B / half Half / half Half / half Half / half Half / half B / half Half / half Half / half Half / half ◎: Very good, ○: Good, △: Bad, ×: Very bad

As shown in Table 4, all of the various tests were satisfactory in the present example, but in the comparative example, they were inferior to the present example, respectively, and synergistic effects were confirmed by the present invention.

As described in conjunction with the above embodiments, according to the peelable coating agent water dispersion according to the present invention, an acrylic copolymer emulsion is a mixture of emulsion copolymers of two different kinds of specific glass transition points, and the acid groups in the mixture are small. Good peelability can be exhibited by setting it as the emulsion which is below quantification and does not use the monomer containing (3) nitrogen elements.

Further, in addition to the above ① to ③, ④ is polymerized by using a reactive surfactant to at least one or more of the emulsion, and ⑤ by synergism by bringing the particle size of the emulsion into a predetermined range, further excellent water resistance, adhesion and Peelability can be exhibited.

In addition, in the acrylic emulsion, those having nitrogen elements such as acrylonitrile are not used. Therefore, when burning and discarding the stripped product after the protection period, nitrogen oxides are not generated and there is no influence of environmental pollution.

Therefore, by using the water-soluble coating product of the peelable coating agent of the present invention, for example, (1) against contamination of the exterior coating and resin parts of automobiles, prevention of damage from deterioration from ultraviolet rays, etc. (2) prevention of contamination such as rust of mechanical parts, etc. ⑤ To prevent contamination of cooking oil or hand oil such as ventilation fans and kitchen appliances ④ To prevent contamination or trauma of aluminum fences ⑤ To prevent contamination or trauma of floors indoors ⑥ Walls or floors in paint booths It can be used for the preservation of materials from scattered paints and for the external wound or beauty retention of FRP resin skis.

Claims (2)

(a) Glass transition point (hereinafter referred to as 'Tg') 40% by weight or more of the acrylic copolymer emulsion at 40 ° C or more, 5% by weight or more, and 60% to 95% by weight of the acrylic copolymer emulsion at Tg 5 ° C to -20 ° C. The following mixtures; (b) the acid group-containing vinyl monomer in the mixture of the acrylic copolymer emulsion of (a) does not contain 2.0% by weight or more as a total amount; Also (c) wherein the acrylic copolymer emulsion of (a) does not contain a nitrogen element-containing vinyl monomer as a monomer; Peelable coating water dispersion, characterized in that. The method of claim 1, wherein at least one of the acrylic copolymer emulsion of (a) is an acrylic copolymer polymerized using a reactive surfactant; In addition, the water release product of the peelable coating agent, characterized in that the particle size of the acrylic copolymer emulsion of (a) is 200 nm or less.