KR102067248B1 - Composition for removing paint film or gasket with aerosol type - Google Patents

Abstract

The present invention relates to a composition for removing an aerosol type coating or gasket. In the present invention, 1,1-dichloro-1-fluoroethane, pyrrolidone-based compound, hydroxypropyl cellulose, polyoxyethylene lauryl ether and 1,1,1,2-tetrafluoroethane, methylene It is eco-friendly because there is no use of chloride, and it has excellent removal effect of coating film or gasket, and it is possible to remove the residue of coating film, gasket, O-ring and injection molding of mold, but it is formed as aerosol type. Provided is an aerosol-type coating film or gasket removal composition having excellent properties.

Description

Composition for removing aerosol type coating or gasket {COMPOSITION FOR REMOVING PAINT FILM OR GASKET WITH AEROSOL TYPE}

The present invention relates to a composition for removing an aerosol type coating or gasket.

In order to improve chemical resistance, corrosion resistance, rust resistance, impact resistance, scratch resistance, etc., the surface of various materials such as buildings, building materials, mobile phones, automobile parts, semiconductor materials, metal materials, and steel materials, etc. The coating film is formed of enamel, urethane resin, epoxy resin, or the like. In addition, gaskets, O-rings, and the like, for maintaining airtightness, are applied to the coupling sites or connection sites of various materials.

In order to recycle the various materials as described above, the residues of the coating film, the gasket, the O-ring, etc. should be removed. Among them, in order to remove the coating film formed of paint or the like, various materials are crushed to a certain size, and then mixed with a volatile peeling organic solvent to rotate the coating film such as paint while rotating at high speed.High pressure water and dry Background Art A method of removing or peeling a coating film such as paint by spraying ice pellets and sand at high speed, a solvent dipping for treating chemicals on various materials, a chemical treatment method such as spraying a paint remover, and the like are known.

However, the method using the volatile peeling organic solvent does not sufficiently peel off the coating film such as paint when the thickness of the coating film is thick or high adhesion, and the method of spraying high pressure water, dry ice pellets, sand, etc. at high speed may damage the surface of the material. This occurred as well as a high cost of equipment. In addition, in the case of solvent dipping, the material must be crushed, and the peeling degree of the coating film, such as paint, is not high compared to the dipping time, thereby having a problem of low efficiency. In particular, the paint remover mainly contains methylene chloride (Methylene chloride), the use of the environment is regulated as it causes environmental pollution.

In order to solve the above problems, there is a need for the development of a remover that does not include methylene chloride and has excellent removal or peeling effect of a coating film including paint. For example, Korean Patent No. 10-1152536 discloses 18 to 23 wt% of an emulsifier, 3 to 7 wt% of a dispersant, 30 to 45 wt% of a solubilizer, 10 to 17 wt% of a penetrant, and 19 to 24 wt% of a viscosity modifier. Accordingly, there is disclosed a paint release agent composition which is environmentally friendly and is not limited to paints and coating resin materials, and exhibits a quick and excellent peeling effect even under simple conditions.

However, in the case of the composition does not contain methylene chloride, including the registered patent, there is a problem that the paint peeling effect is lower than in the prior art and difficult to apply to a coating film made of various forms or components. In addition, only the removal of the coating film, such as paint, there was a problem that is difficult to apply to the removal of residues such as gaskets, O-rings, carbides.

Republic of Korea Patent No. 10-1152536

An object of the present invention is to provide a composition for removing a coating film or gasket of an environmentally friendly aerosol type can not only remove the methylene chloride, but also excellent removal effect of the coating film and can remove the residues such as gaskets, O-rings, etc. have.

The object of the present invention is not limited to the technical problem as described above, another technical problem can be derived from the following description.

In order to achieve the above object, the present invention is 1,1-dichloro-1-fluoroethane (1,1-Dichloro-1-fluoroethane); 1-ethyl-2-pyrrolidinone, N-cyclohexyl-2-pyrrolidone, 1- (2-hydroxyethyl) -2 Pyrrolidone compounds including pyrrolidinone (1- (2-Hydroxyethyl) -2-pyrrolidinone) and lauryl pyrrolidone; Hydroxypropyl cellulose; Polyoxyethylene lauryl ether; And 1,1,1,2-tetrafluoroethane (1,1,1,2-Tetrafluoroethane) provides an aerosol type coating or gasket removal composition comprising.

The composition is based on the total weight of the composition 30 to 50% by weight of the 1,1-dichloro-1-fluoroethane, 15 to 40% by weight of the pyrrolidone compound, 0.1 to 7% by weight of the hydroxypropyl cellulose, the 0.1 to 5 wt% of polyoxyethylene lauryl ether and 25 to 40 wt% of 1,1,1,2-tetrafluoroethane.

The pyrrolidone-based compound is 1-ethyl-2-pyrrolidinone, N-cyclohexyl-2-pyrrolidone, 1- (2-hydroxyethyl) -2-pyrrolidinone and lauryl pyrrolidone 1 It may be included in a weight ratio of: 0.1 to 2: 0.1 to 2: 0.1 to 1.

The composition further comprises a penetrant, the penetrant may comprise one or more selected from the group consisting of potassium hydroxide, sodium hydroxide, magnesium hydroxide, calcium hydroxide, lithium hydroxide and barium hydroxide.

The composition may include 0.1 to 5% by weight of an alkaline penetrant based on the total weight of the composition.

Compositions of the present invention include 1,1-dichloro-1-fluoroethane; Pyrrolidone compounds including 1-ethyl-2-pyrrolidinone, N-cyclohexyl-2-pyrrolidone, 1- (2-hydroxyethyl) -2-pyrrolidinone and lauryl pyrrolidone; Hydroxypropyl cellulose; Polyoxyethylene lauryl ether; And 1,1,1,2-tetrafluoroethane, the removal effect of the coating or gasket can be excellent without the use of methylene chloride, it can be environmentally friendly.

In addition, as well as a coating film formed of paint, enamel, adhesive, varnish, various resins, etc., it may be possible to remove the residue of the gasket, the O-ring and the carbide generated during the injection molding of the mold.

In particular, the composition of the present invention can be improved in the usability and portability as an aerosol type, can be uniformly sprayed over a wide range can further improve the removal efficiency.

1 shows a peeling state of the coating film according to Example 2 in (1) of Experimental Example 2. FIG.
2 shows a state in which the coating film is peeled off according to Example 2 in (1) of Experimental Example 2. FIG.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention.

The terms or words used in the specification and claims of the present invention are not to be construed in a conventional or dictionary sense, and the inventors may appropriately define the concept of terms in order to best explain their invention in the best way. Based on the principle, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention.

Throughout the specification of the present invention, when a part is said to "include" a certain component, it means that it can further include other components, without excluding the other components unless otherwise stated. .

In the specification of the present invention, "A and / or B" means A or B, or A and B.

Throughout the specification of the present invention, the 'painting film' is coated on a base material such as wood, metal, concrete, glass, tile, brick, paint, enamel, adhesive, varnish, lacquer, shellac, varnish, acrylic resin, epoxy resin It may mean a coating film formed of all kinds of paints or resins such as urethane resin, but is not limited thereto.

Throughout the specification of the present invention, the 'gasket' may include all metal gaskets, non-metal gaskets, gaskets in which metals and non-metals are mixed, and may mean all kinds of known gaskets. It is not limited.

In the entire specification of the present invention, 'removal' of the coating or gasket may mean, but is not limited to, melting or removing the coating or gasket from the substrate.

Hereinafter, the present invention has been described in detail, but the present invention is not limited thereto.

The present invention provides an aerosol type coating or gasket removal composition.

In one embodiment of the present invention 1,1-dichloro-1-fluoroethane (1,1-Dichloro-1-fluoroethane); 1-ethyl-2-pyrrolidinone, N-cyclohexyl-2-pyrrolidone, 1- (2-hydroxyethyl) -2 Pyrrolidone compounds including pyrrolidinone (1- (2-Hydroxyethyl) -2-pyrrolidinone) and lauryl pyrrolidone; Hydroxypropyl cellulose; Polyoxyethylene lauryl ether; And 1,1,1,2-tetrafluoroethane (1,1,1,2-Tetrafluoroethane), an environmentally friendly aerosol-type coating film or excellent in removing the coating film or gasket without the use of methylene chloride or It provides a composition for removing the gasket.

In addition, the coating of paint, enamel, adhesive, varnish, various resins, as well as the residue of the gasket, the O-ring and the carbide generated during the injection molding of the mold can be removed, the utilization is high.

The composition of the present invention can be improved in the usability and portability as an aerosol type, can be uniformly sprayed over a wide range can be further improved the removal efficiency. In particular, it can be easily applied to parts that are difficult to reach, such as narrow gaps and seams.

1,1-Dichloro-1-fluoroethane (1,1-Dichloro-1-fluoroethane) is a non-flammable material of the haloalkane series, the pyrrolidone compound of the present embodiment, hydroxypropyl cellulose, polyoxy Ethylene lauryl ether and 1,1,1,2-tetrafluoroethane can be allowed to mix uniformly. In addition, it may serve to improve the formulation stability of the composition according to the present embodiment, but is not limited thereto.

The coating or gasket removing composition of this embodiment may contain 30 to 50 wt%, preferably 34 to 45 wt%, more preferably 40 to 45 wt% of 1,1-dichloro-1-fluoroethane based on the total weight of the composition. It may include.

If the coating or gasket removing composition of the present embodiment contains less than 30% by weight of 1,1-dichloro-1-fluoroethane on the basis of the total weight, the compatibility and formulation stability of each component is reduced, the coating film Or there may be a problem that the gasket removal efficiency is lowered. On the other hand, when the coating or gasket removing composition of the present embodiment contains more than 50% by weight of 1,1-dichloro-1-fluoroethane on a total weight basis, the formulation is diluted to form an aerosol type. Adhesion of the composition of the embodiment is lowered, there may be a problem that the coating film or gasket removal efficiency is lowered.

Pyrrolidone compounds include 1-ethyl-2-pyrrolidinone, N-cyclohexyl-2-pyrrolidone, and 1- (2-hydrol. Hydroxyethyl) -2-pyrrolidinone (1- (2-Hydroxyethyl) -2-pyrrolidinone) and Lauryl Pyrrolidone. 1-ethyl-2-pyrrolidinone (1-ethyl-2-pyrrolidinone), N-cyclohexyl-2-pyrrolidone (N-Cyclohexyl-2-pyrrolidone) and 1- (2-hydroxyethyl) as described above 2-pyrrolidinone (1- (2-Hydroxyethyl) -2-pyrrolidinone) improves the cleaning effect, and lauryl pyrrolidone may improve adhesion, but is not limited thereto.

In this example, 1-ethyl-2-pyrrolidinone, N-cyclohexyl-2-pyrrolidone, 1- (2-hydroxyethyl) -2-pyrrolidinone and lauryl pyrrolidone are 1: 0.1. By including in a weight ratio of -2: 0.1-2: 0.1-1, a coating film or a gasket removal efficiency can be improved. In particular, in this example, 1-ethyl-2-pyrrolidinone, N-cyclohexyl-2-pyrrolidone, 1- (2-hydroxyethyl) -2-pyrrolidinone and lauryl pyrrolidone are 1 A weight ratio of from 0.1 to 2: 0.1 to 2: 0.1 to 1, preferably from 1: 1 to 2: 1 to 0.5 to 1, more preferably from 1: 2 to 0.5: 1. can do. As a result, the proper removal ability and the adhesion to the object to be removed can be improved, whereby the coating film or the gasket removal efficiency can be further improved.

The coating film or gasket removing composition of the present embodiment may include 15 to 40% by weight, preferably 20 to 30% by weight, more preferably 22 to 25% by weight of the pyrrolidone-based compound based on the total weight of the composition.

If the coating or gasket removal composition of this embodiment contains less than 15% by weight of pyrrolidone compounds based on the total weight, the coating or gasket removal efficiency is lowered, and the adhesion of the composition of the present embodiment is reduced. There can be. On the other hand, when the coating film or gasket removing composition of the present embodiment contains more than 40% by weight of the pyrrolidone-based compound on the basis of the total weight, it is difficult to form an aerosol type, the adhesion of the composition of the present embodiment is lowered coating or There may be a problem that the gasket removal efficiency is lowered.

Hydroxypropyl cellulose serves as a binder, an emulsion stabilizer, a viscosity increasing agent, and a film forming agent. In particular, hydroxypropyl cellulose includes 1,1-dichloro-1-fluoroethane, pyrrolidone-based compounds, hydroxypropyl cellulose, polyoxyethylene lauryl ether and 1,1,1,2-tetrafluoroethane The composition of the present embodiment can be sufficiently attached to the removal site to have a removal effect.

The coating or gasket removing composition of the present embodiment may include 0.1 to 7% by weight of hydroxypropyl cellulose, preferably 1 to 5% by weight, more preferably 2 to 3% by weight, based on the total weight of the composition.

If the coating or gasket removal composition of this embodiment contains less than 0.1% by weight of hydroxy propyl cellulose based on the total weight, the composition of this embodiment is not sufficiently attached to the removal site, and thus the coating or gasket removal effect There may be a problem of deterioration. On the other hand, when the coating film or gasket removal composition of the present embodiment contains more than 7% by weight of hydroxypropyl cellulose on the basis of the total weight, the composition of this embodiment is difficult to form an aerosol type, having a gel formulation There can be. Accordingly, there may be a problem that it is difficult to implement the removal effect of the coating film or gasket.

Polyoxyethylene lauryl ether is a surfactant, also called alpha-dodecyl-omega-hydroxy-polyoxyethylene. The polyoxyethylene lauryl ether can stabilize the formulation of the composition according to the present embodiment and allow it to be mixed uniformly, thereby improving the removal efficiency of the coating or gasket. The coating or gasket removing composition of the present embodiment may include 0.1 to 5% by weight of polyoxyethylene lauryl ether, preferably 0.3 to 3% by weight, more preferably 0.5 to 1% by weight, based on the total weight of the composition. have.

If the coating film or the gasket removing composition of the present example, the polyoxyethylene lauryl ether is included in less than 0.1% by weight, the compatibility of each component is lowered, the formulation stability of the composition of the present example is lowered In addition, there may be a problem that the coating or gasket removal efficiency is lowered. On the other hand, in the case of including more than 5% by weight of polyoxyethylene lauryl ether on the basis of the total weight of the coating or gasket removal composition of the present embodiment, the formulation is diluted, adhesion is lowered, coating film or gasket removal efficiency is lowered There may be a problem.

1,1,1,2-tetrafluoroethane (1,1,1,2-Tetrafluoroethane) is an incombustible gas called HFC-134, Norflurane, or the like. In addition, 1,1,1,2-tetrafluoroethane is mixed with air and is not flammable at atmospheric pressure and at temperatures up to 100 ° C., and is mainly used as a high temperature refrigerant for domestic refrigeration and automotive air conditioners. In particular, the composition of the present embodiment may be formed into an aerosol form and sprayed with a non-combustible gas, and may be stable.

The coating or gasket removing composition of this embodiment has 25 to 40% by weight of 1,1,1,2-tetrafluoroethane, preferably 28 to 35% by weight, more preferably 30 to 32, based on the total weight of the composition. It may be included in weight percent.

If the coating or gasket removing composition of the present embodiment contains less than 25% by weight of 1,1,1,2-tetrafluoroethane based on the total weight, it is difficult to be formed in an aerosol form. There may be a problem of this deterioration. On the other hand, when the coating film or gasket removing composition of the present embodiment contains more than 40% by weight of 1,1,1,2-tetrafluoroethane based on the total weight, it is difficult to form in an aerosol form, and is widely used in a wide range of areas. As it is sprayed as it is, there may be an inefficient problem. That is, as spraying property and dispersibility are reduced, the removal efficiency of a coating film or a gasket may fall.

In addition, the coating or gasket removing composition of the present embodiment may further include a penetrant including at least one selected from the group consisting of potassium hydroxide, sodium hydroxide, magnesium hydroxide, calcium hydroxide, lithium hydroxide and barium hydroxide. The penetrant of the present embodiment is an alkaline material, which can break the bonds of the coating film to generate cracks or gaps so that the composition of the present embodiment can penetrate to the inside of the coating film. Accordingly, the removal efficiency of the coating film or the gasket can be further improved. Preferably, lithium hydroxide may be used as the penetrant of the present embodiment, but is not limited thereto.

The coating film or gasket removing composition of the present embodiment may include 0.1 to 5% by weight, preferably 0.5 to 4% by weight, and more preferably 1 to 3% by weight, based on the total weight of the penetrant.

If the coating or gasket removing composition of the present embodiment contains less than 0.1% by weight of the penetrant based on the total weight, there is little effect of the penetrant and there is a problem that the improvement of the coating or gasket removal efficiency may be insignificant. On the other hand, when the coating film or gasket removing composition of the present embodiment contains more than 5% by weight of the penetrant based on the total weight, the formulation stability of the composition of the present embodiment is lowered, problems such as precipitation, agglomeration occur and aerosol type There may be a problem that is difficult to spray into. In addition, damage to the coating film or gasket as well as the material may be caused by the excessively included alkaline penetrant.

The coating or gasket removing composition of the present embodiment may further include additives such as emulsifiers, stabilizers, swelling agents, surfactants, antioxidants, coating agents, catalysts, solvents, metal ion blocking agents, plasticizers, antifoaming agents, curing retardants, and dispersing agents. It may include, but is not limited thereto.

The coating film or gasket removing composition of this embodiment is an aerosol type, and after spraying to adhere or adhere to the object to be removed, the coating film or gasket may be dissolved and peeled off, but is not limited thereto.

In more detail, after spraying the composition according to the present embodiment to the area to be removed, the composition is allowed to soak for about 1 to 10 minutes, and the coating film may be removed with a brush or the like immediately before drying. Thereafter, the surface may be further wiped to remove the residue, but is not limited thereto.

The coating or gasket removing composition of this embodiment comprises the steps of (1) mixing 1,1-dichloro-1-fluoroethane and hydroxypropyl cellulose to prepare a first mixture, and (2) polyoxyethylene to the first mixture. Preparing a second mixture by mixing lauryl ether, (3) mixing the pyrrolidone compound with the second mixture to prepare a third mixture, (4) adding a third mixture into a container, and By filling 1,1,1,2-tetrafluoroethane, it can be produced in an aerosol type.

At this time, the process of preparing each mixture may be carried out through agitation at a speed of 250 ~ 400 rpm, the series of manufacturing process described above may be carried out at room temperature.

Hereinafter, the aerosol-type coating film or gasket removing composition of the present invention will be described in detail with reference to Examples, Comparative Examples, and Experimental Examples. Since these examples are only for illustrating the present invention, the scope of the present invention is not to be construed as being limited by these examples.

EXAMPLE

Examples 1 to 3

According to the composition in Table 1 [unit: wt%] in a reactor at room temperature, 1,1-dichloro-1-fluoroethane and hydroxypropyl cellulose were mixed to prepare a first mixture, and then polyoxyethylene lauryl ether Was mixed to prepare a second mixture. Subsequently, a third mixture was prepared by mixing the pyrrolidone-based compound mixed in a weight ratio as shown in Table 2 [unit: weight ratio] to the second mixture, and then putting it in a container, followed by 1,1,1,2-tetra The composition was prepared by filling fluoroethane. At this time, each mixture was continuously stirred at a speed of about 250 to 400 rpm for the preparation.

The calcium hydroxide of Example 3 was further mixed after mixing a pyrrolidone type compound.

Unit: weight% Example 1 Example 2 Example 3 1,1-dichloro-1-fluoroethane 37 40 40 Pyrrolidone compounds 30 25 25 Hydroxypropyl cellulose 2 2 2 Polyoxyethylene lauryl ether 3 One One 1,1,1,2-tetrafluoroethane 28 32 31 Lithium hydroxide - - One

Unit: weight ratio Example 1 Example 2 Example 3 1-ethyl-2-pyrrolidinone One One One N-cyclohexyl-2-pyrrolidone 2 2 2 1- (2-hydroxyethyl) -2-pyrrolidinone 0.5 0.5 0.5 Lauryl Pyrrolidone One One One

Examples 4-6

It was prepared in the same manner as in Example 1 except that the pyrrolidone compounds of Table 3 were used.

Unit: weight ratio Example 4 Example 5 Example 6 1-ethyl-2-pyrrolidinone One One One N-cyclohexyl-2-pyrrolidone One 3 0.1 1- (2-hydroxyethyl) -2-pyrrolidinone One One 3 Lauryl Pyrrolidone One 2 3

Comparative Example

Comparative Examples 1 to 11

It was prepared in the same manner as in Example 4 except for following the composition of Table 4.

However, in the case of Comparative Example 11 was prepared in the same manner as in Example 3, except that according to the composition of Table 4.

Unit: weight% Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 1,1-dichloro-1-fluoroethane 25 55 45 25 Pyrrolidone compounds 30 15 10 45 Hydroxypropyl cellulose 2 2 2 2 Polyoxyethylene lauryl ether 3 3 3 3 1,1,1,2-tetrafluoroethane 40 25 40 25 Lithium hydroxide - - - - Unit: weight% Comparative Example 5 Comparative Example 6 Comparative Example 7 Comparative Example 8 1,1-dichloro-1-fluoroethane 37 30 37 30 Pyrrolidone compounds 30 30 30 30 Hydroxypropyl cellulose - 10 2 2 Polyoxyethylene lauryl ether 3 3 - 10 1,1,1,2-tetrafluoroethane 30 27 31 28 Lithium hydroxide - - - - Unit: weight% Comparative Example 9 Comparative Example 10 Comparative Example 11 1,1-dichloro-1-fluoroethane 45 30 34 Pyrrolidone compounds 30 20 25 Hydroxypropyl cellulose 2 2 2 Polyoxyethylene lauryl ether 3 3 One 1,1,1,2-tetrafluoroethane 20 45 31 Lithium hydroxide - - 7

Comparative Example 12

Prepared in the same manner as in Example 4, except for including methylene chloride instead of the pyrrolidone compound.

Comparative Example 13

A composition was prepared, comprising 90% by weight of methylene chloride and 10% by weight of methanol.

Experimental Example

Experimental Example 1 Evaluation of Formation of Aerosol Type

Visually assessing whether the compositions prepared according to Examples and Comparative Examples were formed and sprayed in an aerosol type, the results are shown in Table 5. In Comparative Example 13, since it was not formed in an aerosol type, no experiment was conducted.

○: Evenly sprayed in the shape of fog

(Triangle | delta): Although sprayed, it aggregates or forms a liquid droplet

Ⅹ: Spraying is not done properly

Spray Spray Example 1 ○ Comparative Example 5 ○ Example 2 ○ Comparative Example 6 Ⅹ Example 3 ○ Comparative Example 7 Ⅹ Example 4 ○ Comparative Example 8 Ⅹ Example 5 ○ Comparative Example 9 Ⅹ Example 6 ○ Comparative Example 10 Ⅹ Comparative Example 1 △ Comparative Example 11 △ Comparative Example 2 Ⅹ Comparative Example 12 △ Comparative Example 3 △ Comparative Example 13 - Comparative Example 4 Ⅹ

Looking at Table 5, it can be seen that according to the present embodiment is formed in aerosol form with excellent spraying properties.

However, 30 to 50% by weight of 1,1-dichloro-1-fluoroethane of this embodiment, 15 to 40% by weight of pyrrolidone compounds, 0.1 to 7% by weight of hydroxypropyl cellulose, 0.1 to 7% of polyoxyethylene lauryl ether In the case of Comparative Examples 1 to 10 that do not follow the content of 5% by weight and 25 to 40% by weight of 1,1,1,2-tetrafluoroethane, it can be seen that the sprayability is significantly reduced. This means that the comparative example does not form in an aerosol form.

In addition, in the case of the comparative example 13, since gas was not included, evaluation of sprayability was impossible.

Experimental Example 2 Evaluation of Paint Removal (Peeling)

(1) Removal evaluation of urethane acrylic paint

After preparing a base material (steel) having a width of 10 cm, a length of 10 cm, and a thickness of 2 cm, use a urethane acrylic paint to cover the entire upper surface of the base material (10 cm, 10 cm, thickness: 0.1 cm). Formed.

Subsequently, each of the compositions according to Examples and Comparative Examples was sprayed 10 times (once for 10 seconds) on the entire upper surface of the coating film, and then left for 10 minutes. Thereafter, the paint peeled off with the scraper was removed. On the other hand, in the case of Comparative Example 13, the experiment was conducted by applying the same amount.

The area of the paint removed relative to the area of the substrate was calculated and shown in Table 6. The closer to 100%, the higher the paint removal rate. At this time, the paint removal state using the composition of Example 2 is shown in Figs.

% Removal % Removal Example 1 88 Comparative Example 5 10 Example 2 94 Comparative Example 6 45 Example 3 98 Comparative Example 7 22 Example 4 79 Comparative Example 8 41 Example 5 62 Comparative Example 9 35 Example 6 66 Comparative Example 10 44 Comparative Example 1 42 Comparative Example 11 63 Comparative Example 2 33 Comparative Example 12 85 Comparative Example 3 14 Comparative Example 13 86 Comparative Example 4 31

Looking at Table 6, it can be confirmed that the removal rate is remarkably excellent according to this embodiment. In particular, comparing Examples 1 to 4 and Comparative Examples 12 to 13, it can be seen that the present example shows a similar or higher removal rate than the conventional remover using methylene chloride.

Comparing Examples 1 and 4 to 6, the pyrrolidone-based compound according to this Example was prepared with 1-ethyl-2-pyrrolidinone, N-cyclohexyl-2-pyrrolidone, 1- (2-hydroxyethyl ) When containing 2-pyrrolidinone and lauryl pyrrolidone in the weight ratio of 1: 0.1-2: 0.1-2: 0.1-1, it can be seen that the removal effect is significantly improved.

Comparing Example 3 and Comparative Example 11, but including the penetrant, it can be seen that the removal rate is lowered if it contains an excessive amount.

1 and 2 show a part of the part where the paint is peeled off by Example 2 in the process of proceeding to (1) of Experimental Example 2. 1 and 2, it can be seen that the paint is peeled from the specimen when applying the composition of Example 2.

(2) Evaluation of Removal of One-Component Epoxy Adhesive

After preparing a base material (steel) having a width of 10 cm, a length of 10 cm, and a thickness of 2 cm, use a one-component epoxy adhesive to cover the entire upper surface of the base material (10 cm, 10 cm, thickness: 0.1 cm). ) Was formed.

Subsequently, each of the compositions according to Examples and Comparative Examples was sprayed 10 times (once for 10 seconds) on the entire upper surface of the coating film, and then left for 10 minutes. Thereafter, the epoxy adhesive peeled off with the scraper was removed. On the other hand, in the case of Comparative Example 13, the experiment was conducted by applying the same amount.

The area of the adhesive removed relative to the area of the substrate was calculated and shown in Table 7, the closer to 100%, the higher the paint removal rate.

% Removal % Removal Example 1 89 Comparative Example 5 12 Example 2 94 Comparative Example 6 51 Example 3 99 Comparative Example 7 25 Example 4 75 Comparative Example 8 44 Example 5 63 Comparative Example 9 42 Example 6 66 Comparative Example 10 40 Comparative Example 1 38 Comparative Example 11 70 Comparative Example 2 31 Comparative Example 12 86 Comparative Example 3 13 Comparative Example 13 90 Comparative Example 4 30

Looking at Table 7, it can be seen that the removal rate of the epoxy adhesive is remarkably excellent according to this embodiment. In particular, comparing Examples 1 to 4 and Comparative Examples 12 to 13, it can be seen that the present example shows a similar or higher removal rate than the conventional remover using methylene chloride.

Comparing Examples 1 and 4 to 6, the pyrrolidone-based compound according to this Example was prepared with 1-ethyl-2-pyrrolidinone, N-cyclohexyl-2-pyrrolidone, 1- (2-hydroxyethyl ) When containing 2-pyrrolidinone and lauryl pyrrolidone in the weight ratio of 1: 0.1-2: 0.1-2: 0.1-1, it can be seen that the removal effect is significantly improved.

Comparing Example 3 and Comparative Example 11, but including the penetrant, it can be seen that the removal rate is lowered if it contains an excessive amount.

In addition, looking at the (1) and (2) of Experimental Example 2, it can be seen that the composition of the present embodiment shows an excellent removal rate, regardless of the type of urethane, acrylic, epoxy and the like.

Experimental Example 3 Evaluation of Gasket Removal

After applying a silicone liquid gasket (Thribond TB1101) on the surface of the rolled steel plate (150 mm wide, 70 mm long, 0.8 mm thick), the gasket (Ozawa Co., Ltd .: OZAWA) made of NBR (Nitrile rubber) was placed. The weight of the kg was raised and left at room temperature for about 6 months to prepare a test body. At this time, the test body was prepared in accordance with the number of compositions according to Examples and Comparative Examples.

After about six months, the process of spraying the gasket with the composition according to the Examples and Comparative Examples 10 times (once for 10 seconds) and then leaving for 10 minutes was repeated three times in total. Thereafter, the gasket was scraped off with a scraper to remove the peeling gasket.

The area from which the gasket was removed was evaluated based on the following criteria, and is shown in Table 8, which means that the removal efficiency at the time of ○ is the best.

(Circle): When there are few residual gaskets on the surface of a rolled sheet steel

(Triangle | delta): When a part (less than half) of gasket remains on the surface of a rolled sheet steel

Ⅹ: more than half of the gasket is left on the surface of the rolled steel sheet

Removal degree Removal degree Example 1 ○ Comparative Example 5 Ⅹ Example 2 ○ Comparative Example 6 Ⅹ Example 3 ○ Comparative Example 7 Ⅹ Example 4 △ Comparative Example 8 Ⅹ Example 5 △ Comparative Example 9 Ⅹ Example 6 △ Comparative Example 10 Ⅹ Comparative Example 1 Ⅹ Comparative Example 11 △ Comparative Example 2 Ⅹ Comparative Example 12 ○ Comparative Example 3 Ⅹ Comparative Example 13 ○ Comparative Example 4 Ⅹ

Looking at Table 8, it can be seen that the gasket is easy to remove in accordance with the present embodiment. In particular, comparing Examples 1 to 4 and Comparative Examples 12 to 13, it can be seen that the present example shows a similar or higher removal rate than the conventional remover using methylene chloride.

Comparing Examples 1 and 4 to 6, the pyrrolidone-based compound according to this Example was prepared with 1-ethyl-2-pyrrolidinone, N-cyclohexyl-2-pyrrolidone, 1- (2-hydroxyethyl ) When containing 2-pyrrolidinone and lauryl pyrrolidone in the weight ratio of 1: 0.1-2: 0.1-2: 0.1-1, it can be seen that the removal effect is significantly improved.

Comparing Example 3 and Comparative Example 11, but including the penetrant, it can be seen that the removal rate is lowered if it contains an excessive amount.

As described above, the description of the present invention is for illustrative purposes, and those skilled in the art to which the present invention pertains can easily change to other specific forms without changing the technical spirit or essential features of the present invention. I can understand. Therefore, it is to be understood that the embodiments described above are exemplary in all respects and not restrictive. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present invention is shown by the following claims rather than the above description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

Claims (5)

1,1-Dichloro-1-fluoroethane;
1-ethyl-2-pyrrolidinone, N-cyclohexyl-2-pyrrolidone, 1- (2-hydroxyethyl) -2 Pyrrolidone compounds including pyrrolidinone (1- (2-Hydroxyethyl) -2-pyrrolidinone) and lauryl pyrrolidone;
Hydroxypropyl cellulose;
Polyoxyethylene lauryl ether;
1,1,1,2-tetrafluoroethane; And
A penetrant comprising at least one selected from the group consisting of potassium hydroxide, sodium hydroxide, magnesium hydroxide, calcium hydroxide, lithium hydroxide and barium hydroxide;
The composition is based on the total weight of the composition 30 to 50% by weight of the 1,1-dichloro-1-fluoroethane, 15 to 40% by weight of the pyrrolidone-based compound, 0.1 to 7% by weight of the hydroxypropyl cellulose, the An aerosol-type coating film comprising 0.1 to 5% by weight of polyoxyethylene lauryl ether, 25 to 40% by weight of 1,1,1,2-tetrafluoroethane and 0.1 to 5% by weight of the penetrant. Or gasket removal composition.
delete The method of claim 1,
The pyrrolidone-based compound
1-ethyl-2-pyrrolidinone, N-cyclohexyl-2-pyrrolidone, 1- (2-hydroxyethyl) -2-pyrrolidinone and lauryl pyrrolidone are 1: 0.1-2: 0.1 2: A composition for removing an aerosol-type coating film or gasket, characterized by comprising a weight ratio of 0.1 to 1.
delete delete

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