JPH09165536A - Coating material remover composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject composition containing specific amounts of compounds having respective specific structures, having uniformizing and conditioning actions on the substrate supporting a coating material and useful for the erasure or ascribblings and the removal of ink adhered to the screen, etc., of a screen printing press.

SOLUTION: This composition contains (A) 20-80 pts.wt. of a dicarboxylic acid dialkyl ester having 4-6C dicarboxylic acid reside and 1-3C alkyl reside or a mixture of the esters, (B) 10-60 pts.wt. of a 2-(2-akoxyethoxy) ethanol having 1-4C alkoxy residue, (C) 10-20 pts.wt. of an aliphatic alcoholpolylycol ether, (D) 50-120 pts.wt. of an N-alkylpyrrolidone having 1-8C alkyl residue, (E) 0-40 pts.wt. of a fatty acid ester having 10-22C fatty acid residue and 1-8C aliphatic alcohol residue or a mixture of the esters, (F) 0-30 pts.wt. of a thickener, (G) 0-20 pts.wt. of orange terpene and (H) 0-20 pts.wt. of 20-25% orthophosphoric acid.

COPYRIGHT: (C)1997,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paint removing agent, and more particularly to an agent having a homogenizing and conditioning effect on a paint supporting substrate. Such base materials include, for example, various rubbers, ferrous metals, non-ferrous metals, plaster, bricks,
Wood, natural stone, artificial stone, concrete and plastic. A preferred application for paint removers is to remove unwanted graffiti drawn on the walls of building homes and the like, and the ink deposited on screens and templates for screen printing machines.

[0002]

2. Description of the Prior Art Until the early 1980s, methylene chloride, phenol and methanol were mainly used as active substances in paint removers and paint removers, but thereafter, in this field as well, there is a possibility of harming users and the environment. There was widespread recognition that it was desirable to use far fewer active ingredients.

Thus, in the 1987 edition of the practitioner's edition published by Fairlark Für Chemie Industrie H. Ziolkovsky Geemweher (Headquarters: Augsburg), pages 105-106, DE
3438399 is suggested. Described in this patent publication is a varnish remover without anticorrosives, especially without waxes, for removing coatings on the facades and walls of buildings, with dicarboxylic acid as the main active ingredient. Methyl ester (from DuPont "The basic ester (DB
It is a paint remover containing a mixture of butyl diglycol) which is commercially available under the trade name of E).

From the company newsletter of DuPont, a paint stripper composition containing N-methylpyrrolidone, an aromatic hydrocarbon and a naphthene hydrocarbon in addition to the above-mentioned component "dibasic ester" is known. . In addition to this, the practitioner's yearbook 1989, page 58, describes the formulation for "household paint strippers and crocodile removers" containing just this main component.

In addition, this area of expertise includes H. H. of DuPont Testing Laboratories (Wilmington, Del., USA), which discusses reducing risk of paint stripping. L. Jackson's paper “DBE-based stripper formu
relations "(February 12-13, 1991, record of international conference in Washington, DC, pages 173-176), and 19
1991 Consumer Report, 565 340-3 “Paint Remo
vers = New ProductsEliminate old Hazards ”exist. Other related printed materials are US 4673524, US 4
927556, EP-A 389829, GB 2191501 and DE 4025039.

As a summary of such developments illustrated by patents and other published papers, today's paint removers and paint removers are commercially available dibasic esters, N-methylpyrrolidone and alkyldiglycols as the major agents. It can be confirmed that it contains.

However, in the above-mentioned printed matter, two of these main active substances always appear together with other components.

In the field of screen printing technology, printing inks deposited on screens, templates and the like are overwhelmingly removed with aromatic solvents such as toluene, xylol, cumene and mesitylene. This is done partly in a screen printing machine or in a screen cleaning device after the printing process. The screen cleaning device is usually connected to a distillation device for solvent recovery. All of the solvents used are subject to regulatory legislation on flammable liquids, evaporate quickly and are readily soluble in water, so that they are widely used in screen printing plants to eliminate factors that endanger workers, the environment and equipment. Safe measures must be taken in practice. However, in spite of these measures, humans and the environment will be severely afflicted there with solvent vapors.

International Patent Application PCT / DK 89/00222 (WO 90/034
19) according to C _1-4 derived from an aliphatic C _8-22 monocarboxylic acid.
It is known that alkyl esters can be used to remove dirt, ink and the like from printing presses. Despite such important innovations in the field of offset printing, such solvents have not become widespread in screen printing equipment. That is, because the inks used there are specialty inks, the dissolving power of such agents is not sufficient to achieve cleaning within an economically reasonable time. When the two-part paint dries up or out, the drug completely ceases to work.

[0010]

Accordingly, the problem underlying the present invention is, on the one hand, a paint removal which can be successfully used in a wide variety of fields and which on the other hand fulfills the essential requirements in respect of humans and the environment. It is to create a drug.

[0011]

Surprisingly, it has been found that this problem is solved by the present invention.

The subject of the invention is, according to a first embodiment, a paint remover characterized by the following composition: 20-80 parts by weight of a dicarboxylic acid dialkyl ester or a mixture of esters having 4 to 6 carbon atoms in the dicarboxylic acid residue and 1 to 3 carbon atoms in each alkyl residue. 2- (2-alkoxyethoxy) ethanol having 1 to 4 carbon atoms in an alkoxy residue 10 to 60 parts by weight-fatty alcohol polyglycol ether 10 to 20 parts by weight-1 to 8 parts in an alkyl residue 50-120 parts by weight of N-alkylpyrrolidone having 10 carbon atoms-A fatty acid ester having 10 to 22 carbon atoms in the fatty acid residue and 1 to 8 carbon atoms in the fatty alcohol residue Or a mixture of esters 0 to 40 parts by weight-thickener 0 to 30 parts by weight-orange terpene 0 to 20 parts by weight 20 to 25% orthophosphoric acid 0 to 20 parts by weight Preferred of the first embodiment An improved example is described. That is, the following paint remover (a)
− (E).

(A) In the first embodiment, the amount of the dicarboxylic acid dialkyl ester is 35 to 55 parts by weight, and the alkyl residue therein is a methyl group, and .

(B) In the paint removing agent according to the first embodiment and (a), the amount of N-alkylpyrrolidone is 65 to 110 parts by weight, and the alkyl residue means a methyl group or an octyl group. Said paint remover.

(C) In the first embodiment, (a) and (b), the amount of 2- (2-alkoxyethoxy) ethanol is
20 to 55 parts by weight, and the alkoxy residue means a methoxy group or a butoxy group, The above paint remover.

(D) In the first embodiment and (a)-(c), the fatty acid ester content is at most 30 parts by weight, and the alcohol residue therein corresponds to a methyl group or an ethylhexyl group. The above paint remover characterized by the above.

(E) In the first embodiment and (a)-(d), the above paint remover containing a highly dispersible silicic acid as a thickener.

The subject of the invention according to a second embodiment is a similar application, in particular for removing printing ink deposited on screens and templates for screen printing machines.
A paint remover having the following composition. 20-80 parts by weight of a dicarboxylic acid dialkyl ester or a mixture of esters having 4 to 6 carbon atoms in the dicarboxylic acid residue and 1 to 3 carbon atoms in each alkyl residue. 2- (2-alkoxyethoxy) ethanol having 2 to 4 carbon atoms in the alkoxy residue 20 to 70 parts by weight-fatty alcohol polyglycol ether 4 to 30 parts by weight-12 to 18 in fatty acid residue Fatty acid ester having 1 to 4 carbon atoms in the fatty alcohol residue, or a mixture of esters 15 to 40 parts by weight · 10 to 16 carbon atoms in the fatty acid residue Fatty acid ester having 5 to 10 carbon atoms in the fatty alcohol residue, or a mixture of esters 0 to 80 parts by weight N-alkyl having 1 to 8 carbon atoms in the alkyl residue Piroli The emission 0-100 parts by weight fatty acid amide 0-5 parts by claim 8 to 11, preferably improvement of the second embodiment of the according invention have been described. That is, the following (a) to (d).

(A) In the second embodiment, the above paint remover wherein the alkyl residue of N-alkylpyrrolidone has 1 to 4 carbon atoms, preferably 1 carbon atom.

[0020] (b) In a second embodiment, and (b), the fatty acid residues and fatty alcohol residues, at most 20 g I _2/100
The paint removing agent, characterized in that a vegetable fat having only an iodine value of g is used as a raw material.

(C) In the second embodiment and (a) and (b), in the fatty alcohol polyglycol ether, the fatty alcohol residue has 8 to 16 carbon atoms and the polyglycol ether residue has 6 carbon atoms. Consists of ~ 14 ethoxy units,
In some cases, the above paint remover is characterized in that it has an alkoxy residue at its end.

(D) In the second embodiment and (ii)-(iii), the paint removing agent, wherein the fatty acid residue of the fatty acid amide has 8 to 18 carbon atoms.

The paint remover according to the present invention functions to make uniform and to condition the various paints on which the paint has been removed. Thus, for example, the surface of a concrete wall from which the drawn graffiti has been removed with the agent according to the invention becomes smoother than before the application of such agent. When the ink sticks out and is removed from the rubber roller of a screen printing machine or the rubber blanket of an offset printing machine that has become completely stiff, the rubber material again exhibits good elasticity.

[0024]

In removing the printing ink from the screen and the template of the screen printing machine, especially when it is a quick-drying two-component paint, the agent according to the invention is compared with the conventionally used mixed solvents. Shows improved and thorough action. Furthermore, the drug according to the present invention is not subject to regulatory legislation on flammable liquids, it hardly evaporates at room temperature and can be washed off with water. When applied to a screen printing machine, the operator and the environment can clearly avoid the adverse effects of solvent vapors and the risk of fire is significantly reduced. The substances contained in the paint remover are easily biodegradable. That is, it seems that bioaccumulation does not occur in such substances. The paint remover according to the present invention can be used again after being reprocessed by simple filtration after use.

[0025]

The present invention will be described below with reference to examples. Example 1 A first paint remover is prepared from the following ingredients. Palm oil fatty acid 2-ethylhexyl ester 15 parts by weight Rapeseed oil methyl ester 11 parts by weight Butyl diglycol 26 parts by weight Dibasic ester (DBE) 50 parts by weight N-methylpyrrolidone 82 parts by weight Fat alcohol polyglycol ether 16 parts by weight These Combine the ingredients and stir until a clear mixture forms.

The mixture is brushed onto a completely hard rubber roller with a large amount of ink still applied in a screen printing machine. After a working time of about 10 minutes, the rubber roller is washed with water and wiped dry. The rubber roller then again exhibits its original color and dull gloss. Rubber also regains its elasticity.

Treating the rubber blanket of an offset printing press with the mixture instead of the rubber roller of a screen printing press has the same positive effect. Example 2 A second paint remover is prepared from the following ingredients. Orange terpene 10 parts by weight methyldiglycol 30 parts by weight dibasic ester (DBE) 42 parts by weight N-octylpyrrolidone 104 parts by weight fatty alcohol polyglycol ether 10 parts by weight until the individual components are mixed to form a transparent mixture Stir.

In a paper mill or a cardboard mill, the mixture is applied to a grooved deflector roller in which glue, paint and paper residues are partially dried to a thickness of 5 mm or less. After a working time of 5 minutes, the roller is brushed and rubbed with a piece of cloth until glossy.

The deflector roller is now free of any residue and reappears to its original gloss. Example 3 A third paint remover is prepared from the following ingredients. 23% Phosphoric acid 18 parts by weight Butyldiglycol 52 parts by weight Dibasic ester (DBE) 42 parts by weight N-methylpyrrolidone 90 parts by weight Fat alcohol polyglycol ether 14 parts by weight Highly dispersible silicic acid 18 parts by weight Mix liquid components Combine and stir until a clear mixture forms. Then add the thickener. This produces a pasty product.

Two or more years have passed since the coating, and this paste is applied to a metal pipe in the shape of a garden fence bar dotted with rust. about
After a working time of 20 minutes, the paint is completely removed. with this,
Rust is also removed. After paint removal, the tubes can be washed with water and repainted immediately after drying. Example 4 A fourth paint remover is prepared from the following ingredients. Palm oil Fatty acid methyl ester 21 parts by weight 20% Phosphoric acid 9 parts by weight Butyldiglycol 22 parts by weight Dibasic ester (DBE) 41 parts by weight N-methylpyrrolidone 70 parts by weight Fat alcohol polyglycol ether 12 parts by weight High dispersibility 20 parts by weight of silicic acid Mix these ingredients and stir until a clear mixture forms. Then add the thickener without bubbling. This produces a pasty product.

This mixture is applied to a concrete wall which has been at least a year old since the graffiti was drawn. The coating thickness of the paste is 1-2 mm.

After a working time of about 20 minutes, the wall surface is rubbed with a loose cloth or a hard brush to remove the paint. The paint that has penetrated deeply into the holes in the wall is washed out with water only using a high-pressure cleaner. Even if the work with the high pressure cleaner is just after the working time, the paint removal is perfectly successful. After drying, the walls are completely free of paint. The wall surface is smoother than before treatment. This makes it much easier to remove the paint if applied again.

The above-mentioned paste is applied to a semi-log of a garden fence which has been used for more than two years. After an action time of about 20 minutes, the paint is removed with a loose piece of cloth, a broom or a spatula. In removing the paint in this case, it is not necessary to wash off the paint remover. If the undercoat is applied within 24 hours, the spreadability is enhanced by the residue of the paint removal paste, and the paint is dried faster. Example 5 A fifth paint remover is prepared from the following ingredients. Orange terpene 20 parts by weight 25% Phosphoric acid 12 parts by weight Butyldiglycol 55 parts by weight Dibasic ester (DBE) 38 parts by weight N-methylpyrrolidone 80 parts by weight Fat alcohol polyglycol ether 20 parts by weight Highly dispersible silicic acid 14 parts by weight All components are treated as in Example 4. In addition, a fluid paste is produced.

This mixture is applied to the painted marking lines on the surface of asphalt roads. This work must be performed on a rainless day as the mixture is partially soluble in water.
After about 20 minutes of working time, the marker paint is wiped off with a damp cloth and the paint remaining in the holes is washed out with a high-pressure cleaner.

After this treatment, the marking paint has been completely removed from the asphalt road surface. Comparative Examples 1 and 2 For comparison with the paint remover according to the invention described in Examples 1-5, the paint remover according to DE 3438399 (Practical Yearbook 1987
Formulation examples described on pages 105 to 106) and a paint remover by the formulation "household paint stripper and crocodile remover" (former yearbook for practitioners 1989 edition, formulation examples described on page 58) were prepared and tested. Comparative Example 1 (according to DE 3438399) Butyl glycol 12 parts by weight Dibasic ester (DBE) 66 parts by weight Cellulose acetobutyrate 2 parts by weight Alkylbenzene sulfonate 10 parts by weight Water 5 parts by weight This formulation was applied to a rubber roller according to example 1. If so, trying to clean and condition the rollers as described there does not work.

Even when the deflector roller used in Example 2 is applied, the transition is negative.

The paint removal on the metal tube described in Example 3 is certainly successful, but the rusted areas must be post-treated.

The paint removal according to Example 4 can only be carried out incompletely.

The same applies when removing the road marking paint in accordance with Example 5. Comparative Example 2 (Household paint stripper and crocodile remover) N-methylpyrrolidone 40 parts by weight n-butanol 2 parts by weight Monoethanolamine 2 parts by weight Dibasic ester (DBE) 25 parts by weight Aromatic hydrocarbon (xylene) 10 parts by weight Part Nafate (Solvesse 150) 17.3 parts by weight Antarox CO-630 (surfactant) 2 parts by weight Gafac RE 610 (surfactant) 0.5 parts by weight Klucel H (thickener) 1.2 parts by weight According to Example 1 When applied to rubber rollers, the rubber swells badly resulting in its surface breaking.

When applied to a deflector roller according to Example 2, the same results as in Example 2 are obtained.

The same behavior appears when applied to a metal tube according to Example 3.

The cleaning of the concrete wall according to Example 4 is indeed successful, but after drying, the treated surface shows mottle and edging.

When the road marking paint is treated according to Example 5 with the aromatic compound component and the naphthene compound component in the above-mentioned formulation, an undesired softening will occur in the road surface portion provided with the paint removing agent.

Due to the high content of aromatic compounds and naphthenes in the formulation, there is a risk of harming the health and environment of the user. From tests at university hospitals, such substances are known to affect the human central nervous system. Example 6 A sixth paint remover is prepared from the following ingredients. Palm oil fatty acid 2-ethylhexyl ester 75 parts by weight Palm kernel fatty acid methyl ester 30 parts by weight 2- (2-propoxyethoxy) ethanol 56 parts by weight Dipropyl succinate 30 parts by weight Fat alcohol polyglycol ether 8 parts by weight Palm oil fatty acid diethanolami 1 part by weight Mix these ingredients and stir until a clear mixture forms.

Two-component ink for screen printing (for example,
TD-2-KFA, zinc white) was applied to a screen (40 × 60 cm ² ) and dried at room temperature for 1 hour, and then treated with a paint remover as follows.・ Apply paint remover with a brush, action time 3 minutes ・ Apply a small amount of water to the screen with a brush, continue for 1 minute ・ Wash the screen with a large amount of water, continue for 2 minutes ・ Dry the screen with warm air at 50 ° C, Lasts for 2 minutes After this treatment the screen is clean and can be reused. Example 7 A seventh paint remover is prepared from the following ingredients. Palm kernel fatty acid 2-ethylhexyl ester 50 parts by weight Palm oil fatty acid propyl ester 20 parts by weight 2- (2-butoxyethoxy) ethanol 25 parts by weight Dimethyl succinate 13 parts by weight Dimethyl glutarate 41 parts by weight Dimethyl adipate 10 parts by weight N -Propylpyrrolidone 25 parts by weight Fat alcohol polyglycol ether 12 parts by weight Palm kernel oil fatty acid diethanolamide 4 parts by weight These ingredients are mixed and stirred until a clear mixture is formed.

The resulting paint remover is applied according to Example 1. Again, a clean screen is obtained which can be reused immediately. Example 8 An eighth paint remover is prepared from the following ingredients. Palm oil fatty acid methyl ester 24 parts by weight 2- (2-butoxyethoxy) ethanol 25 parts by weight diethyl adipate 49 parts by weight N-methylpyrrolidone 75 parts by weight Fat alcohol polyglycol ether 25 parts by weight Palm oil fatty acid diethanolamide 2 parts by weight Parts These ingredients are mixed and stirred until a clear mixture forms.

Apart from the treatment according to Examples 6 and 7, P-Pv 25-A Kokowei and another coating manufacturer's curing agent PH are used as two-part coatings. After applying the paint, the screen and template are dried at 80 ° C. for 1 hour.
The paint remover is then applied according to Examples 6 and 7. The result is a clean screen that can be immediately reused. For comparison with the paint remover according to the invention described in Comparative Examples 3 and 4 Examples 6-8, a conventional type of paint remover and patent application PCT / DK 89 /
[0022] A comparison with a drug according to (WO / 03419) is performed. Comparative Example 3 A conventional type of paint remover is prepared from the following ingredients. Naphthene hydrocarbons (flash point approx. 60 ° C.) 180 parts by weight xylene 4 parts by weight fatty alcohol polyglycol ether 16 parts by weight With this agent, from the screen pretreated according to Example 8 and thus also within 15 minutes from the template Even if I try to remove the adhered paint, it does not work. Comparative Example 4 A paint remover is prepared from the following components in accordance with the above patent application. Palm kernel oil 45 parts by weight Palm kernel oil fatty acid propyl ester 40 parts by weight Palm oil fatty acid methyl ester 95 parts by weight Fat alcohol polyglycol ether 20 parts by weight From a screen pretreated with this agent according to Example 6 or 7 Attempting to remove the adhered paint within 15 minutes does not work.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Horst Freishmann Burghausen Germany 8484, Robert Koch Strasse 210

Claims (11)

[Claims] 1. A paint remover having the following composition, which shows the effects of homogenization and condition adjustment when necessary for a paint support substrate. 20-80 parts by weight of a dicarboxylic acid dialkyl ester or a mixture of esters having 4 to 6 carbon atoms in the dicarboxylic acid residue and 1 to 3 carbon atoms in each alkyl residue. 2- (2-alkoxyethoxy) ethanol having 1 to 4 carbon atoms in an alkoxy residue 10 to 60 parts by weight-fatty alcohol polyglycol ether 10 to 20 parts by weight-1 to 8 parts in an alkyl residue 50-120 parts by weight of N-alkylpyrrolidone having 10 carbon atoms-A fatty acid ester having 10 to 22 carbon atoms in the fatty acid residue and 1 to 8 carbon atoms in the fatty alcohol residue Or a mixture of esters 0 to 40 parts by weight Thickener 0 to 30 parts by weight Orange terpene 0 to 20 parts by weight 20 to 25% orthophosphoric acid 0 to 20 parts by weight 2. The paint remover according to claim 1, wherein:
The paint remover, wherein the amount of the dicarboxylic acid dialkyl ester is 35 to 55 parts by weight, and the alkyl residue therein is a methyl group. 3. The paint remover according to claim 1 or 2, wherein the amount of N-alkylpyrrolidone is 65 to 110 parts by weight, and the alkyl residue means a methyl group or an octyl group. The paint remover. 4. The paint remover according to any one of claims 1 to 3, wherein the amount of 2- (2-alkoxyethoxy) ethanol is 20 to 55 parts by weight, and the alkoxy residue is a methoxy group or The above paint remover, which means a butoxy group. 5. The paint removing agent according to claim 1, wherein the fatty acid ester content is at most 30 parts by weight, and the alcohol residue therein corresponds to a methyl group or an ethylhexyl group. The paint remover according to claim 1. 6. The paint removing agent according to any one of claims 1 to 5, wherein the paint removing agent contains highly dispersible silicic acid as a thickening agent. 7. A paint remover for removing ink adhering to a screen of a screen printing machine and a template, wherein the paint remover is characterized by the following composition. 20-80 parts by weight of a dicarboxylic acid dialkyl ester or a mixture of esters having 4 to 6 carbon atoms in the dicarboxylic acid residue and 1 to 3 carbon atoms in each alkyl residue. 2- (2-alkoxyethoxy) ethanol having 2 to 4 carbon atoms in the alkoxy residue 20 to 70 parts by weight-fatty alcohol polyglycol ether 4 to 30 parts by weight-12 to 18 in fatty acid residue Fatty acid ester having 1 to 4 carbon atoms in the fatty alcohol residue, or a mixture of esters 15 to 40 parts by weight · 10 to 16 carbon atoms in the fatty acid residue A fatty acid ester having 5 to 10 carbon atoms in the fatty alcohol residue, or a mixture of esters 0 to 80 parts by weight N-alkyl having 1 to 8 carbon atoms in the alkyl residue Pyrrolide 0 to 100 parts by weight fatty acid amide 0 to 5 parts by weight 8. The paint remover according to claim 7, wherein
Said paint remover, characterized in that the alkyl residue of N-alkylpyrrolidone has 1 to 4 carbon atoms, preferably 1 carbon atom. 9. The paint removing agent according to claim 7 or 8, wherein the fatty acid residue and the fatty alcohol residue are at most
The paint removing agent, which comprises a vegetable fat with only iodine value of 20 g I _2/100 g as a raw material. 10. The paint remover according to claim 7, wherein the fatty alcohol residue in the fatty alcohol polyglycol ether has 8 to 16 carbon atoms, and the polyglycol ether residue remains. The above paint remover, wherein the group is composed of 6 to 14 ethoxy units, and optionally has an alkoxy residue at the end thereof. 11. The paint removing agent according to any one of claims 7 to 10, wherein the fatty acid residue of the fatty acid amide is 8 to 10.
The above paint remover having 18 carbon atoms.