JPS6157665A - Paint peeling agent - Google Patents

Abstract

PURPOSE:To provide the titled composition which is safe as it is and capable of effectively removing a firm coating film in a short time, by compounding a specific aromatic hydrocarbon solvent, a glycol ether, a monoalkanolamine and an amino ether at specific ratios. CONSTITUTION:The objective composition is composed of (A) 20-40% aromatic hydrocarbon of formula I, formula II or formula III (R1, R2 and R3 are 1-4C alkyl), (B) 5-30% glycol ether acetate of formula IV (R is 1-4C alkyl or benzyl; X is CH or CHOCH), (C) 0-30% glycol ether of formula R-O-X-OH, (D) 0-40% monoethanolamine or monoisopropanolamine, (E) 2-40% amino ether such as monomethoxypropylamine, monoethoxypropylamine, (F) 0.1-5.0% anionic surfactant, and (G) 0-20% water.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application of the Invention) The present invention relates to a paint remover used for removing coating films of various paints.

(Prior art) Various stripping agents have been proposed to be used for stripping the coating 'J4 film (coating film). Paint film strippers are widely used in practical applications. However, the halogenated hydrocarbons that are the ingredients of these strippers are
Since it is volatile and toxic, it is of course necessary to use it during coating work on paint films.

Even after the application is complete, toxic methylene chloride or trichlorethylene vapor is generated, damaging the health of workers and causing environmental pollution. In addition, the swollen coating film is removed using a scraper or wire brush, but this removal process itself is not that easy, so it is difficult to apply the coating properly. 2.If the swelling point is incorrectly judged, the swollen paint film will often re-adhere.In addition, when the paint film is removed, solvents such as methylene chloride and other stripping agents may remain in the paint film. Ingredients (composition)
etc., sticks to the skin of the fingers, hands, face, etc., causing stinging (itching).
or cause skin irritation.

OBJECTS OF THE INVENTION The primary object of the present invention is to provide a safe and effective paint stripper that solves the problems of known strippers, such as toxicity, environmental pollution, and difficulty in stripping operations.

(Means for solving the problem; configuration) The present invention combines a specific aromatic hydrocarbon solvent, glycol ethers, monoalkanolamines, and amino ethers in a specific ratio, and creates a homogeneous system. Its greatest feature is that it is safe as a single unit, is easy to operate, and can effectively remove various types of strong coating films within the short spacing.

The main solvent of the paint film stripper of the present invention is an aromatic hydrocarbon such as toluene, xylene, ethylbenzene, propylbenzene, butylbenzene or butyltoluene.
Mixtures of these aromatic hydrocarbons are generally commercially available as raw materials for paints.

The following aromatic hydrocarbons have excellent solubility, permeability, and swelling properties for various paint films, and are therefore effective in removing paint films. When hydrocarbons are selected, the evaporation rate of the solvent is reduced, and as a result, the action of the stripper lasts for a long time, and even stubborn paint films can be easily removed.
Can be softened.

In addition, the use of these hydrocarbons with high boiling points and high flash points reduces the risk of ignition, and also reduces the diffusion of solvent into the atmosphere, improving the working environment and preventing environmental pollution. The content of 0 or more main solvents, which are also beneficial for
is within the range of

The paint film stripper of the present invention may contain an auxiliary solvent in an amount equal to or less than the amount of aromatic hydrocarbons as the main solvent. Examples of such co-solvents include glycol ether acetates such as methyl cellosolve acetate, ethyl cellosolve acetate, butyl cellosolve acetate, benzyl cellosolve acetate, carpitol acetate and butyl carpitol acetate, and particularly preferred co-solvents include cellosolve acetate and It is a glycol ether acetate that is easily soluble in water, such as carpitol acetate. In addition, IL of this auxiliary solvent is in the range of 5 to 30% in the composition.

The paint film stripping agent of the present invention can further contain alkanolamines such as monoethanolamine or monoisopropanolamine as a stripping accelerator as a more preferable auxiliary component. Its amount is not more than 4% of the total composition.

J! consisting of the above main solvent, auxiliary solvent and release accelerator! Although the compound cannot be used as it is to remove paint films, it is a little inconvenient to use because it tends to cause phase separation.The inventors of the present invention have conducted various studies to improve this drawback.
Various solubilizing agents, such as monohydric or dihydric alcohols such as ethylene glycol, calpitol, methanol or ethanol, and monoethylamine, monopropylamine,
Monobutylamine, 3-ethoxypropylamine.

Monofurkylhumins such as 3-ethoxypropylamine, monobenzylamine, monoallylamine, 2-ethylhexylamine or monolaurylamine were investigated, but
It was recognized that the system solubilized with alcohol had a lower peeling force and was not practical. On the other hand, low saturated and unsaturated amines such as monoethylamine, monopropylamine, monobutylamine or mono7lylamine have an unpleasant odor, so
I also learned that this is not suitable for practical use. Furthermore, monobenzylamine, which is an alicyclic amine, has a poor release promoting effect, and 2-ethylhenylamine and monolaurylamine have low solubilization ability and do not provide a uniform system. However, of the many drugs tested, only 3-methoxypropylamine and 3-ethoxypropylamine were found to be solubilizers with satisfactory solubilizing ability and workability. Therefore, these ω-flucoxy lower alkyl amines are the characteristic constituents of the paint film remover of the present invention, and their appropriate blending ratio is 2% to the total amount of the composition.
~40%. By keeping the blending ratio within this range, it is possible to obtain an ideal paint film stripping agent that has no fear of phase separation, has excellent stripping ability, and does not emit any unpleasant odor.

The paint film stripping agent according to the present invention may be further added with glycol ethers such as ethyl cellosolve calpitol or butyl cellosolve and water as necessary to further enhance its effectiveness against some paint stripping. increase

The preferred addition ratios of these glycol ethers and water are less than 30% and less than 20%, respectively.

The addition of an anionic surfactant does not affect the stripping effect itself, but makes it easier to wash away residual solvent from the surface to be treated. The appropriate addition ratio is 0.1 to 5.0
%.

A lipophilic thickener such as methylcellulose is useful for uniformly applying the stripping agent of the present invention onto the film to be stripped using a brush or roller, and its suitable addition, t-i range, is as follows: 1 to 5%, and the viscosity is in the range of 1,000 to 3,000 centimeters.

Furthermore, when waxes such as paraffin wax are added,
As a result of suppressing the evaporation of the solvent, the effect of the present stripping agent is maintained even when the working environment is improved, so that the stripping effect on stubborn paint films is increased. Suitable additives for waxes include 0.
The range is from 2.0% to 2.0%.

The constituent components of the paint film remover according to the present invention and their appropriate blending ratios are as explained above, but in actual products, it is preferable that each component is present in an appropriate balance. As a result of various tests, the inventor found that an appropriate blending ratio generally falls within the range of the following formula.

a≧2b and (a+b+c)≦8(d+e) (However, the symbols a-e mean each component described in claim 1.) That is, (i) the aromatic hydrocarbon that is the main solvent (a) is
The amount is twice or more than that of glycol ether acetate (b) which is a co-solvent, and (the total amount of the three components including component C glycol ether added to φ components a and b is:
Component (d) lower alkanolamine and component (e) 7
A condition that provides good harmony in the product is that the amount is 6 times or less than the total amount with minoethers.

(Method of Use) The paint film remover according to the present invention can be applied to a film-like body formed from various paints and adhesives applied on various materials such as wood, steel, mortar, etc. (Accordingly, The term "coating film" mentioned repeatedly in this specification is a broad concept that includes not only paint films but also thin films formed with adhesives. ,
There are two types: dipping method and coating method.

In any case, the paint film to be peeled to which the paint film remover of the present invention has been applied is in a state where the paint film has been lifted from the coated surface or partially dissolved due to the action of penetration, swelling, dissolution, etc. of the paint film remover. Therefore, it can be easily removed by scraping with a trowel or scraper. Under normal conditions, it is sufficient to carry out the coating (or dipping) and peeling process only once, but it is possible to apply two or three coats on a deteriorated coating that is difficult to remove. If so, please apply this remover twice or three times (dip).
It is preferable that this multi-coating (or multi-dipping)ff
) method can completely remove even a hard coating film.

Hereinafter, the mode of carrying out the invention will be described with reference to the $ flow side, but the examples are of course for illustrative purposes and are not intended to limit the invention concept.

Stir and mix the above ingredients until uniform.

Stir and mix as in Example 1.

Stir and mix as in Example 1.

Stir and mix as in Example 1.

After stirring and mixing the aromatic hMK mixture, cellosolve acetate, and 3-methoxypropylamine until uniform, the mixture is heated to 50 to 60°C, other components are added, and further stirred and dissolved.

Prepared as in Example 5.

Prepared in the same manner as in Example 5.

! "Give" Prepared as in Example 5.

(Example of use) The results of the peeling test using the paint film remover of each of the above examples are shown in Table 1 below. A coating method was used for the samples.

1) Immersion test method: After applying various paints three times to a slate, plate or iron plate, the sample piece is left for about one month. This sample piece is immersed in the stripping agent to be tested, and the time until stripping occurs is measured.

Table-1 (Removal effect of undeveloped BA coating RQ remover)'' Note 1) ■: Peeling off within 30 minutes after application, O: Peeling off within 60 minutes after application, -
No two tests.

(Effects) As stated above, the present invention has an important meaning in the coating industry by providing a paint film stripping agent that has excellent stripping ability and is safe.

Claims (4)

[Claims] (1) Each of the following components, i.e. a) General formula ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼, ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ or ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ (R_1 in the formula , R_2 and R_3 have 1 to 4 carbon atoms
20 aromatic hydrocarbons represented by (representing an alkyl group)
~40% (based on weight, the same applies hereinafter) b) General formula ▲ Numerical formula, chemical formula, table, etc. ▼ (In the formula, R represents an alkyl group of C_1 to C_4 or a benzyl group, and X is an atomic group -CH- or CHOCH c) Glycol ether acetate represented by the general formula R-O-X-OH (wherein R is C_1 to C_4
represents an alkyl group or a benzyl group, and X is an atomic group -CH
- or CHOCH) d) Monoethanolamine or monoisopropanolamine 0-40% e) Amino ethers such as monomethoxypropylamine or monoethoxypropylamine 2-40% % f) 0.1 to 5.0% of an anionic surfactant and g) 0 to 20% of water. (2) Each component of the composition has a weight ratio of a≧2b
and (a+b+c)≦6(d+e) (wherein the symbols a to e mean each component described in claim 1). Film stripping agent composition. (3) The composition according to claim 1 or 2, which contains an evaporation inhibitor and a thickener and can be applied to the surface of the coating film to be peeled using a roller, brush, or the like. (4) A patent in which the evaporation inhibitor and thickener are 0.5 to 2.0% paraffin wax and 1.0 to 5.0% methyl cellulose, respectively, based on the composition of claim 1. The composition according to claim 3.