JPH05230406A - Paint remover - Google Patents

Abstract

PURPOSE:To prepare the title remover which has suitable nonvolatility and fungicidal properties and facilitates the removal of an unnecessary coating film by compounding a quaternary ammonium salt, an alcohol, and a solvent for dissolving the film. CONSTITUTION:The title remover contains a quaternary ammonium salt, an alcohol, and a solvent for dissolving a coating film to be removed. The salt is fungicidal, has affinity to the components of the film, and makes the coating film soft, pref. examples of the salt being an alkylammonium chloride and an alkylbenzylammonium chloride. The alcohol is also fungicidal, dissolves the salt, and has, in order to facilitate the dissolution of the film surface, a high affinity to the components of the film. The solvent dissolves the film and facilitates the removal, pref. examples being xylene, acetone, and methyl ethyl ketone.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating film peeling agent having bactericidal properties and having an excellent peeling action and the like.

[0002]

2. Description of the Related Art As a stripping agent for a wall coating film, a volatile organic solvent such as methylene chloride and acetone, and a wax for suppressing the volatility of the organic solvent are conventionally contained as constituent components. However, since the stripping agent contains a volatile organic solvent and a component for further enhancing the stripping action, there is a problem that a skin injury, a nerve injury, and other health problems for a coating stripping operator may occur. is there. In addition, since it contains wax as a constituent component, the wax remains on the ground surface, and the problem that the new coating film surface cannot be formed uniformly after the coating film is peeled off. There is a problem such as wall pollution due to the above.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a coating film peeling agent which has appropriate nonvolatility and bactericidal property and which can easily remove a peeling coating film.

[0004]

According to the present invention, a coating containing a quaternary ammonium salt, an alcohol, a coating solvent and, if necessary, a water-generating agent or the like. A film stripper is provided.

The present invention will be described in more detail below.

The quaternary ammonium salt used in the coating film peeling agent of the present invention is a component that imparts flexibility to the coating film to be peeled and has an antibacterial action and the like. Preferred are alkylammonium chloride, alkylbenzylammonium chloride, coconut diamine diazopinate and the like, and specifically, ethylammonium chloride, methylammonium chloride, isopropylammonium chloride, methylbenzylammonium chloride, ethylbenzylammonium chloride, isopropylbenzyl. Preferable examples are ammonium chloride and the like. When used, they can be used alone or in combination of two or more. The content ratio of the quaternary ammonium salt is preferably 2 to 50% by weight, more preferably 5 to 10% by weight, based on the entire coating film peeling agent. When the content of the quaternary ammonium salt is less than 2% by weight, the bactericidal property against contaminants, particularly microorganisms and the effect of penetrating into the coating layer cannot be obtained, and when it exceeds 50% by weight, the drying rate is delayed, and It is not preferable because it becomes expensive.

The alcohols used in the paint stripping agent of the present invention are components that dissolve the quaternary ammonium salt and have a bactericidal action, and are, for example, paint components for facilitating dissolution of the paint film surface. Examples of alcohols having a good affinity are listed below. Specifically, lower chain alcohols such as isopropyl alcohol, ethanol and isobutyl alcohol, and lower cyclic alcohols such as phenoxyethanol and phenyl cellosolve can be preferably mentioned. The above can be mixed and used, and it is particularly preferable to use a combination of a lower chain alcohol and a lower cyclic alcohol. At this time, the combination of the lower chain alcohol and the lower cyclic alcohol is preferably 10: 1 in weight ratio.
˜50: 1, particularly preferably 25: 1 to 50: 1.

The content of the alcohols is preferably 20 to 60% by weight, particularly preferably 30 to 50% by weight, based on the total amount of the coating film peeling agent. The content ratio is 2
If it is less than 0% by weight, the drying speed will be delayed and 60% by weight
If it exceeds, the drying speed is too fast and the workability is poor, which is not preferable.

The coating solvent used for the coating stripper of the present invention is
A component having a function of dissolving the coating film to be peeled and facilitating the peeling of the coating film, and preferred examples thereof include xylene, acetone, and methyl ethyl ketone.

The content ratio of the coating film solvent is preferably 30 to 70% by weight, particularly preferably 35 to 50% by weight, based on the entire coating film peeling agent. If the content ratio of the coating solvent is out of the above range, the coating becomes difficult to soften, and if it exceeds 70% by weight, the harmfulness of the organic solvent appears, which is not preferable.

Further, the coating film peeling agent of the present invention may further contain a water-generating agent capable of curing the peeling coating film to a semi-solid state in order to facilitate the peeling work. Examples of the water-generating agent include alkyd resin, silane resin, epoxy resin, and silicone resin, and commercially available trade name "Chemistop" (manufactured by Mitsui Chemicals Co., Ltd.) can also be used. The content ratio of the water-generating agent is preferably less than 30% by weight, particularly preferably 8 to 15% by weight, based on the entire coating film peeling agent. At this time, if the amount of water is 30% by weight or more, the water-repellent agent penetrates and remains on the surface of the body to be coated, which deteriorates the affinity for a new coating film and makes new coating difficult, which is not preferable.

Further, in order to delay the drying rate of the coating film peeling agent of the present invention, a usual surfactant such as nonionic liponox (trade name, manufactured by Lion Co.) or a usual rust preventive agent is added. May be. At this time, the content of the surfactant or the rust preventive is preferably 5 to 10% by weight based on the total amount of the coating film peeling agent.

To prepare the coating film peeling agent of the present invention, for example, an alcohol and a coating film solvent, preferably at room temperature to 40.
C., particularly preferably 30 to 40.degree. C., mixed and dissolved, and then mixed in a mixed solution of the alcohol and the coating solvent to give a fourth solution.
It can be prepared by adding an ammonium salt and mixing.

To use the coating film peeling agent of the present invention, the coating film peeling agent prepared by the above-mentioned preparation method is used with a brush or a roller brush, preferably in an amount of 50 to 100 ml / m ² . It can be used by applying it evenly on the surface of the coating film, and preferably after 5 to 20 minutes, scraping off with a normal scrubber or the like.

[0015]

EFFECTS OF THE INVENTION Since the coating film peeling agent of the present invention has appropriate non-volatility and excellent bactericidal properties, there are few health hazards such as skin damage during the coating film peeling work, and it is possible to remove it on the wall surface after the coating film peeling. It is possible to prevent contamination by microorganisms and the like. Further, since the coating film softened by the coating film release agent of the present invention is easily solidified, the coating film can be peeled and removed from the wall surface without requiring a great deal of labor, and further, the spots on the substrate, cracks, etc. By leaving the coating film peeling agent of the present invention on, a smooth and clean peeled surface can be obtained, and therefore uneven coating can be prevented even when a new painted surface is formed. still,
At this time, the coating film peeling agent of the present invention remaining on the peeled surface does not adversely affect the new coating film surface because the alcohols and the coating film solvent that dissolve the coating film have already evaporated.

[0016]

The present invention will be described in more detail based on the following examples and comparative examples, but the present invention is not limited thereto.

[0017]

Example 1 50 parts by weight of isopropyl alcohol, 2 parts by weight of phenoxyethanol, and xylol 32 at room temperature.
After being mixed with 4 parts by weight, 4 parts by weight of "Arcard C50" and "Arcard CB5" as a quaternary ammonium salt were mixed.
0 "4 parts by weight (both are trade names, manufactured by Lion) and 8 parts by weight of" Chemstop "(trade name, manufactured by Mitsui Chemicals Co., Ltd.) as a water-generating agent are shown in Table 1 below. A coating film peeling agent having a component composition was prepared.

Then, under the conditions shown in Table 2 below, the coating film release agent is applied to the surface of the coating film to be peeled off with a brush, and after the surface of the coating film is softened (5 minutes after application in A, application in B). After a lapse of 10 minutes later), the softened coating film surface was scraped off with a scrubber. The results are shown below.

[0019]

[Table 1]

[0020]

[Table 2]

(Results) The coating films of both A and B could be easily peeled off.

[0022]

Example 2 A coating film peeling agent was prepared in the same manner as in Example 1 except that the components of the coating film peeling agent were changed to the components shown in Table 3 below, and applied to the coating film surface in the same manner as in Example 1. Then, the coating film was scraped off.

[0023]

[Table 3]

(Results) A: The coating film could be peeled off very easily by hand. B: The coating film could be easily peeled off. The coating film pieces (shavings) that had been peeled off and fell on the floor were sufficiently hardened in about 20 minutes, and cleaning work was easy.

[0025]

Comparative Example 1 A coating film was applied in the same manner as in Example 1 except that the components shown in Table 4 below were used instead of the components shown in Table 4, and the coating surface on the coated surface was only slightly dissolved. However, the coating film could not be peeled off. .

[0026]

[Table 4]

[0027]

[Comparative Example 2] A commercially available coating film peeling agent "Skeleton" (trade name, manufactured by Natco Paint Co., Ltd.) was used to coat the coating film surface in the same manner as in Example 1B. Although it could be peeled off, the coating film peeling agent remained on the precursor side, and when a new EP paint was applied, some areas did not dry even 48 hours after the application, and it was necessary to peel again. Further, when it was applied to the wall surface of the dressing room, the coating film could be peeled off, but the shavings that fell on the floor were not cured and cleaning was difficult.

Claims (2)

[Claims] 1. A coating film peeling agent comprising a quaternary ammonium salt, alcohols, and a coating film solvent. 2. The coating film peeling agent according to claim 1, further comprising a water-generating agent.