JPS62227470A - Easily removable marking method - Google Patents

Abstract

PURPOSE:To enable the repeated use of an adapting material by making marking hard to disappear even if marking is moistened by rain and easily removing the same after use, by using swellable colored releasable paint as a marking agent. CONSTITUTION:Water swellable colored releasable paint comprises a compound prepared by adding water to 100pts.wt. of a polyvinyl butyral emulsion resin with an average polymerization degree of about 700-2,400 and a degree of butyralization of about 75wt%, 20-50pts.wt. of a plasticizer and 5-200pts.wt. of colored pigment in a range of 100-1,000pts.wt. with due regard to making workability and a film thickness, etc. The surface of a base plate comprising wood having a water-resistant film applied thereto and showing no liquid absorbability, plastic or a metal is marked with said paint and, if the marking film is washed off after use by an aqueous removing liquid to bring the surface of the base plate to a clean state, said base plate can be reused. Because the paint is only swollen even if moistened by rain and not eluted, it can be effectively used in a signboard for an advertisement.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is a method for marking one surface of a non-liquid-absorbing substrate made of metal, glass, plastic, wood, or a water-resistant coating on the surface thereof. and removal (erase) of its markings
The present invention relates to an easily removable marking method which can be performed simply and easily, and which can be repeatedly performed.

(Prior Art) Temporary display means, such as welcome signs for inns, temporary advertising signs for shops, and shop window decorations have conventionally used water-based paints, coloring pigments, and water-based paints. Furthermore, marking was carried out using a small amount of a marking agent made of a water-soluble resin, if necessary.

In addition, signposts, wreaths, name plates attached to flowers, etc. used at funerals were usually made of solid wood with brushstrokes written in ink or other ink.

<Problems to be Solved by the Invention> However, since the water-based paints, marking agents, or ink described above are water-soluble, when they get wet due to rain, etc., the markings may smudge or disappear (and the strength of the film may deteriorate). In addition, there were various drawbacks such as the fact that if the marking film was touched, it would contaminate the objects it touched.

Further, when the surface of the substrate used is rough, there is a drawback that even if the marking film is removed, the marking agent remains in the minute recesses, (that is, it is difficult to remove).

Furthermore, if a liquid-absorbing wooden board is used as the substrate,
Because the marking agent used has penetrated into the inside,
After use, it is necessary to scrape off the surface layer with a plane etc. (for reuse), which is very time-consuming.In addition, there is also the disadvantage that the board becomes thinner after repeated use. there were.

Conventionally, a method of filling the surface of the board and erasing the markings after use has been taken, but this method also requires a coating agent to fill it in, which is therefore uneconomical. This method has the disadvantage that it cannot be applied when it is desired to take advantage of the beauty of wood grain, etc.

The present invention was made in view of the current situation, and aims to eliminate or improve the various drawbacks mentioned above.

In other words, the present invention makes it difficult for the marking to disappear even if it gets wet with rain, etc., does not cause contamination even if the marking film is touched, and in addition, the marking can be easily and completely removed after use, and there is no possibility of repeating. It provides a certain marking method.

Means for Solving the Problems> That is, the present invention comprises: (i) polyvinyl butyral emulsion resin having an average degree of polymerization of about 700 to 2,400 and a degree of butyralization of about 75% by weight or more...100 parts by weight; (ii) plasticizing agent ・
・・20-50 parts by weight, (iii) Colored pigment・
...5 to 120 parts by weight, (iv) water ...10
Mark the surface of a non-liquid-absorbing substrate with a water-swellable colored peelable paint containing 0 to 1,000 parts by weight, and after use, wash and remove the marking film with an aqueous removal solution. The present invention relates to an easily removable marking method characterized by:

The present invention will be explained in more detail below.

First, in the present invention, a "non-liquid-absorbing substrate" to which a peelable paint is applied is a substrate that does not substantially absorb water-swellable colored peelable paint, which will be described later, when marked with the paint. It can be used without any particular restrictions. For example, metal plates such as aluminum, iron, and stainless steel, plated plates; plastic plates such as polyvinyl chloride, acrylic resin, and polycarbonate; rubber plates; ceramic plates; glass plates or laminates thereof, and coated substrates. These are listed as representative examples.

Marking agents can also be used on liquid-absorbing wood boards, such as veneer panels made from natural wood, plywood, particle boards, fiberboards, etc., with sliced veneers glued onto them. Wooden boards coated with a water-resistant coating to prevent absorption can also be used in the present invention.

In the present invention, desired characters, symbols, figures, etc. are marked on the surface of such a substrate using a "marking agent" described below.

As will be described later, the marking agent used in the present invention is one that swells when water or an aqueous removal solution containing water as its main component is applied, resulting in a decrease in adhesion to the substrate (water-swellable). Any colored peelable paint can be used. For example, it consists of a polyvinyl butyral emulsion resin, a plasticizer, a color pigment, and water.

As the polyvinyl butyral emulsion resin,
Average degree of polymerization of about 700 to 2400, particularly preferably 900
~2000 is appropriate, and the degree of butyralization is approximately 75.
% by weight or more is suitable.

Note that if the average degree of polymerization is lower than the above range, the strength of the marking film obtained will be insufficient, and as a result, the marking agent will become finer when the marking film is removed, and will tend to remain in the fine recesses of the substrate, causing contamination, and vice versa. If the amount exceeds the above range, emulsification becomes difficult and a stable marking agent cannot be obtained.

Furthermore, if the degree of butyralization is lower than the above range, it becomes water-soluble and tends to remain in minute recesses on the surface of the substrate when the marking film is removed, causing contamination.

In the present invention, a plasticizer is used. As the plasticizer,
Glycols such as polyethylene glycol and triethylene glycol, phosphates such as tricresyl phosphate, phthalates such as dibutyl phthalate and dioctyl phthalate, sebacates such as dibutyl sebacate and dioctyl sebacate, fatty acid esters, and castor oil. , chlorinated paraffin and the like are representative examples.

The appropriate amount of the plasticizer is 20 to 50 parts by weight per 100 parts by weight of the polyvinyl butyral emulsion resin. If the blending amount is less than the above range, a sufficient adhesion reducing effect cannot be obtained when removing the marking film with an aqueous removal liquid, and the marking film tends to lack flexibility. On the other hand, if the amount exceeds the above range, the marking film tends to become sticky, and it also becomes difficult to remove the marking film cleanly.

In the present invention, colored pigments are used. As the coloring pigment, common paint pigments such as carbon black, titanium oxide, phthalocyanine blue, and yellow lead can be used. The blending amount varies depending on the pigment's oil absorption, coloring power, hiding power, etc.
Usually, 5 to 120 parts by weight is suitable for 100 parts by weight of polyvinyl butyral emulsion resin.

Water is used in the present invention. Water is 100 to 100 parts by weight per 100 parts by weight of polyvinyl butyral emulsion resin.
0! The amount of water may be determined by taking into consideration marking workability, film thickness, etc., with the E amount being appropriate.

The marking agent used in the present invention comprises, in addition to the above-mentioned components, various extender pigments, additives, etc. as required.

The marking agent used in the present invention, the "water-swellable colored peelable paint," consists of the above-mentioned components. Marking is performed in an arbitrary shape by various means such as , spraying, etc.

Note that when the marking agent forms a marking film, water (
Easily soluble ones are not suitable because the marking film tends to wash out due to rain outdoors, and the pigment in the marking agent tends to remain in minute recesses on the surface of the substrate.

On the other hand, in the present invention, even if the marking film gets wet due to the above-mentioned use, the marking film only swells at most, so the entire film is integrated. It has the advantage that it does not remain in any recesses.

In the present invention, after marking in this manner and using it for its intended purpose, the marking film is washed and removed using an aqueous removal solution.

When the aqueous removal liquid used in the present invention wets the surface of the marking film by means such as coating, it penetrates into the marking film, swells the marking film, and reaches the substrate interface. As a result, it has the effect of weakening the adhesion between the marking film and the substrate.

Note that among the aforementioned aqueous removal liquids, those that substantially dissolve the marking film are not suitable because pigment bones tend to remain in minute recesses on the substrate surface.

In the present invention, as the aqueous removal liquid, water f:
(c) Mixtures with solvents such as hydromethyl alcohol, ethyl alcohol, propyl alcohol, butyl alcohol, cellosolves, calpitols, ethylene glycol, glycerin, etc., or various surfactants to increase permeability to these as necessary. A mixture of these is used.

In the above, for example, the appropriate mixing ratio of water and the alcohol is 10010 to 70/30.

In the present invention, the marking film is removed by impregnating the marking film with an aqueous removal liquid by coating or other means.
A suitable method is to allow the marking film to swell by leaving it for several tens of seconds to several tens of minutes, and then rub it off with a cloth, brush, pants, etc.

Other methods include seed stages such as spraying high-pressure water.

<Effects of the Invention> According to the method of the present invention, since a water-swellable colored peelable paint is used as the marking agent, the marking film will not be eluted even if it gets wet with rain or the like.

It just swells and therefore the marking does not disappear. Moreover, even when the markings are removed,
It has the feature that the marking film can be peeled off and removed cleanly without pigment bones remaining in the minute recesses on the substrate surface.

Therefore, it is possible to repeatedly mark and remove markings without filling them out or scraping off the surface of the substrate.

The present invention will be explained in detail below with reference to Examples. In the examples, "parts" and "%" are expressed on a weight basis.

[Preparation of marking agent A]

100 parts of polyvinyl butyral resin (average degree of polymerization 1000, degree of butyralization 78%), 1 part dioctyl phthalate
0 parts of castor oil, 30 parts of castor oil, and 5 parts of anionic surfactant were heated to 120° C. with stirring to form a uniform solution, and then 140 parts of water was gradually added dropwise to form an emulsion.

Add 2.5 parts of carbon black to 30 parts of the resulting emulsion.
Marking agent A was prepared by mixing and stirring 20 parts of calcium carbonate, 1 part of polyether ester thickener, and 45 parts of water.

[Preparation of marking agent B]

100 parts of polyvinyl butyral resin (average degree of polymerization 920, degree of butyralization 76), 20 parts of dibutyl sebacate,
5 parts of triethylene glycol and 5 parts of anionic surfactant were heated to 120° C. with stirring to form a uniform solution, and then 130 parts of water was gradually added dropwise to form an emulsion.

Marking agent B was prepared by mixing and stirring 15 parts of titanium oxide, 3 parts of silica, and 50 parts of water to 30 parts of the obtained emulsion.

[Preparation of marking agent C]

Marking agent A except that polyvinyl butyral resin with a degree of polymerization of 300 and a degree of butyralization of 73 was used.
Marking agent C was prepared in the same manner as above.

Example 1 Letters were written on a hard polyvinyl chloride plate (600 x 500 x 3 mm) using a brush with marking agent A, and the plate was left to stand at room temperature for one day. The marked polyvinyl chloride plate was stood vertically outdoors and left for 10 days, but no abnormality was observed in the marking film.

Next, spray water on the surface of the left PVC board, leave it at room temperature for 5 minutes, and then pour the water over the surface of the PVC board.
120 mm) was rotated (200 r, p, m) to scrape off the marking film. The marking film could be easily removed without leaving any traces.

Comparative Example 1 Marking was performed in the same manner as in Example 1 using marking agent C instead of marking agent A, and the marking film was rubbed off by the same means.

However, markings remained in minute recesses on the surface of the polyvinyl chloride, and it took about three times as long as in Example 1 to completely remove them.

Example 2 An oak veneer (200 x 600 x 1 Omm) was lightly sanded with abrasive paper, then a urethane sanding sealer was applied and dried, then sanded and smoothed, and then a urethane clear paint was applied and dried.

Marking agent B was written on the wooden painted board thus prepared using a brush, and the board was allowed to stand at room temperature for one day.

No abnormality was observed in the marking film even after the marked wooden painted board was vertically stood outdoors and left for one week.

Next, an aqueous removal solution consisting of 70 parts of water, 20 parts of ethyl alcohol, and 10 parts of butylcarpitol was sprayed onto the surface of the wooden painted board left as described above, and the marking film was rubbed off in the same manner as in Example 1. , the marking film could be easily removed without leaving any traces. Although this process was repeated 10 times, there was almost no change in the surface of the wooden painted board, and there was no change in the ease of removing the marking film.

Claims (1)

[Scope of Claims] (i) Polyvinyl butyral emulsion resin with an average degree of polymerization of about 700 to 2,400 and a degree of butyralization of about 75% by weight or more...100 parts by weight, (ii) Plasticizer...20 to
50 parts by weight, (iii) Coloring pigment...5 to 120 parts by weight, (iv)
Water: The surface of a non-liquid-absorbing substrate is marked with a water-swellable colored peelable paint containing 100 to 1000 parts by weight, and after it is used, the marking film is coated with an aqueous removal solution. An easily removable marking method characterized by removing.