KR20110041700A - Aqueous expansion solution, expanded coating method and sheet product using the same - Google Patents

Abstract

PURPOSE: An aqueous expansion solution is provided to prevent dust from being fallen even if unevenness section is rubbed with the hand after unevenness is formed and to ensure environment-friendly property using water as a solvent. CONSTITUTION: An aqueous expansion solution is obtained by adding expandable polymeric microsphere and other additives into aqueous emulsion in which a polymer is emulsified and dispersed in water. The aqueous emulsion has one selected from styrene butadiene polymer emulsion, acrylic polymer emulsion, vinyl acetate polymer emulsion, and other aqueous emulsion.

Description

Aqueous expansion solution, base sheet foam coating method using same and foam coating sheet product produced thereby {Aqueous expansion solution, expanded coating method and sheet product using the same}

The present invention relates to an aqueous foaming solution, and more particularly, to an aqueous foaming solution which does not contain an organic solvent such as toluene and which can form uneven patterns on the base sheet in an environmentally friendly manner.

The present invention also relates to a base sheet foam coating method for forming an uneven pattern on the base sheet using the aqueous foaming solution, and a foam coated sheet product produced thereby.

At present, a wallpaper having an uneven pattern similar to the present invention is produced. This is coated with an oily coating solution on a base-paper, followed by foaming, or embossing (pressing) with an embossing to form surface irregularities.

In this case, PVC resin / polymer is mainly used as a binder, and a plasticizer such as DOP or DBP is added to the oily coating liquid. PVC has a risk of toxic chlorine gas in case of fire, and plasticizers such as DOP / DBP are also harmful substances. In addition, in the case of the oil-based coating, it may be regarded as a pollution-free manufacturing method because residual solvents such as toluene and methyl ethyl ketone (MEK) are gradually volatilized.

On the other hand, flock printing is another method of forming the uneven pattern. Flock printing is primarily based on the desired pattern with adhesive materials such as varnishes and pastes on flat base sheets such as paper and cloth, and then sprinkled with thin and fine microfiber yarns onto the flat substrate sheets. It is to form a flocking of the uneven pattern on the base sheet.

Such a floc printing method has the following disadvantages.

(1) A large amount of fiber yarn dust during printing causes the production worker to work in a harsh environment.

(2) Since the first base-printing of the adhesive material such as varnish / glue should be carried out by silk screen method, the productivity can be significantly lower since it can only be produced with flat and predetermined widths.

(3) The manufacturing cost is high due to complicated process such as printing the first adhesive-> spraying the second floc-> removing the extra floc-> drying for fixing the adhesive.

(4) In the case of the produced product, the bonding force is weak because the fine fiber yarns and the adhesive cannot be compressed to be strongly adhered. In addition, since no crosslinking is formed between the microfiber yarn and the adhesive, the bonding force is not permanent, and when a slight force or friction is applied, the microfiber yarns fall out and blow into the dust in the air. Harmful to young children's respiratory system. In addition, the product's intended pattern is damaged and the value of the product is reduced.

Therefore, the problem to be solved by the present invention is to provide an environmentally friendly aqueous foaming solution using water as a solvent instead of the oil-based coating solution that has been a problem in the past containing organic solvents such as toluene, PVC and plasticizer.

In addition, the problem to be solved by the present invention is environmentally friendly by forming an uneven pattern on the base sheet using the aqueous foaming solution, even when rubbed by the uneven portion by hand dust does not come off harmless to the human body of the consumer, of the manufacturing process It is to provide a base sheet foam coating method that provides a reduction in production cost due to the simplification and foam coating sheet products produced thereby.

 The aqueous foaming solution according to the present invention for achieving the above object is made by adding an expandable polymeric sphere (Expandable Polymeric Microsphere, EPM) and other additives to the aqueous emulsion in which the polymer is emulsified and dispersed in water, the aqueous emulsion And at least one selected from the group consisting of styrene butadiene copolymer polymer emulsion series, acrylic polymer emulsion series, vinyl acetate polymer emulsion series, and other aqueous emulsion series.

Examples of the styrene butadiene copolymer polymer emulsion series include styrene-butadiene copolymer polymer emulsion, carboxy-styrene-butadiene copolymer polymer emulsion, styrene-butadiene-acrylonitrile copolymer polymer emulsion, and carboxy-butadiene-styrene-acrylonitrile copolymer polymer emulsion. And at least one selected from other styrene-butadiene copolymer polymer emulsions.

As the acrylic polymer emulsion series, at least one selected from an acrylic polymer emulsion, a styrene-acrylic copolymer polymer emulsion, a cross-linked acrylic-styrene copolymer polymer emulsion, and other acrylic polymer emulsions may be used. have.

As the vinyl acetate polymer emulsion series, those containing at least one selected from ethyl vinyl acetate polymer emulsion, ethyl vinyl acetate-acrylic copolymer polymer emulsion, vinyl acetate polymer emulsion, and other vinyl acetate emulsion may be used.

Examples of the other aqueous emulsion series include a latex emulsion, a latex emulsion, a polyurethane emulsion, a petroleum resin emulsion, a rosin emulsion, a rosin ester emulsion, and a polymer having a glass transition temperature (Tg) of 50 ° C. or less in emulsion-dispersible polymers in water. Among those aqueous emulsions prepared by emulsifying and dispersing in water, those containing at least one selected can be used.

The base sheet foam coating method according to the present invention for achieving the above object is, by coating the above-described aqueous foaming solution on a base sheet (sheet), the desired pattern or the entire surface (dry) and then drying and foaming to the aqueous foaming solution As the water contained in the solvent is volatilized, the concave-convex pattern or the front coating is formed on the base sheet.

Coating of the aqueous foaming solution may be made of a silk screen method, a gravure method, or a flexo method.

The foaming is preferably made in a temperature range of 60 ℃ ~ 300 ℃.

The drying and foaming may occur at substantially the same time, or the drying may occur firstly and the foaming may be secondary.

Glitter powder may be fixed to the foaming site by adding glitter powder to the aqueous foaming solution, and pigments such as pigments and dyes may be added to the aqueous foaming solution to impart color to the foaming site.

In addition, a fluorescent pigment / dye or a photoluminescent pigment / dye may be added to the aqueous foaming solution to impart a fluorescent effect or a luminous effect to the foamed portion.

When the foam coating sheet product is manufactured by the base sheet foam coating method, it is possible to obtain a product that is harmless to consumers as compared with the related art.

According to the present invention, since an organic solvent such as toluene, PVC, and a plasticizer are included, an environmentally friendly aqueous foaming solution using water as a solvent is used instead of an oily coating solution which has been a problem in the past. In addition, as the crosslinking between the binder and the binder in the aqueous foaming solution and between the binder and the adherend during the drying / foaming process, a strong bonding force is secured, dust is removed even after rubbing the uneven portion by hand after forming the foam irregularities It does not come out can produce a product that is harmless to the human body of the consumer. In addition, since the water contained in the aqueous foaming solution in the drying process is volatilized and foamed, the manufacturing process is simplified and the production cost is reduced.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail. The following examples are only presented to understand the content of the present invention, and those skilled in the art will be capable of many modifications within the technical spirit of the present invention. The scope of the invention should not be construed as limited to these examples.

[Aqueous Foaming Solution]

The aqueous foaming solution used in the present invention is made by adding expandable polymeric microsphere (EPM) and other additives to an aqueous emulsion in which the polymer is emulsified and dispersed in water.

Table 1 below is a preferred formulation of the aqueous foaming solution.

TABLE 1

ingredient 100 fractions by dry weight Emulsion Dispersion Polymer Aqueous Emulsion 20-70 EPM 3-30 Thickener 0-5 catalyst 0-6 Other additives 0.1-3

The aqueous emulsion used in the aqueous foaming solution is as follows.

(1) styrene butadiene copolymer polymer emulsion series

Styrene-butadiene copolymer polymer emulsion, carboxy-styrene-butadiene copolymer polymer emulsion, styrene-butadiene-acrylonitrile copolymer polymer emulsion, carboxy-butadiene-styrene-acrylonitrile copolymer polymer emulsion, other styrene-butadiene polymer emulsion.

(2) Acrylic Polymer Emulsion Series

Acrylic polymer emulsions, styrene-acrylic copolymer polymer emulsions, cross-linked acrylic-styrene copolymer polymer emulsions, other acrylic polymer emulsions.

(3) Vinyl Acetate Polymer Emulsion Series

Ethyl vinyl acetate polymer emulsion, ethyl vinyl acetate-acrylic copolymer polymer emulsion, vinyl acetate polymer emulsion, other vinyl acetate polymer emulsion.

(4) other aqueous emulsion series

Raver latex emulsions, other latex emulsions, polyurethane emulsions, petroleum resin emulsions, rosin emulsions, rosin ester emulsions, and polymers having a glass transition temperature (Tg) of 50 ° C. or less in water emulsion emulsion dispersion in water Aqueous emulsions.

The aqueous emulsion to be used in the aqueous foaming solution may be selected according to the type of foam adherend (flat substrate sheet), it may be advantageous to use two or more mixed according to each characteristic, not just one type.

The aqueous emulsion of the styrene-butadiene copolymer polymer can be adhered to the adherend after foaming when the glass transition temperature (Tg) is 50 ° C. or lower. However, if the glass transition temperature is too low, the foam part may fall due to a decrease in friction resistance. The carboxy-styrene-butadiene copolymer polymer emulsion series has better adhesion to the adherend than the styrene-butadiene copolymer polymer emulsion series. This is because the carboxyl group promotes crosslinking with the blowing agent (EPM) and promotes bonding with hydroxyl groups of the base sheet.

In the case of the acrylic polymer emulsion series, the crosslinked acrylic polymer emulsion has better adhesion than the general acrylic polymer emulsion. However, excessive crosslinking may limit the degree of foaming.

The emulsion of the vinyl acetate polymer series is excellent in flexibility after forming the foamed coating film, and has excellent bonding strength with a cloth such as polyester, cotton, T / C, and nonwoven fabric.

 [Proportion of Aqueous Binder and EPM]

When the content of EPM is excessive, the binder is relatively insufficient and the friction resistance of the foamed part is reduced after foaming. In addition, when the content of EPM is insufficient, the foaming is too weak to reduce the uneven effect. As a result of the experiment related to the present invention, the ratio of the aqueous binder based on the dry weight and the EPM should be in the range of 1.2 to 10.0 to obtain the proper effect.

[Other additives]

Other additives include thickeners, catalysts, antifoams, lubricants, anticoagulants and the like. As the thickener, an acrylic thickener or a polyurethane thickener is suitable. Diammonium hydrophosphate may be used as a catalyst for promoting crosslinking between the binder and the binder.

[Sheet]

The substrate sheet to which the present invention is applied is not particularly limited as long as it is a material having a two-dimensional planar shape.

(1) Paper and laminate paper

One of the materials consisting of paper or cardboard such as white paper (white paper, art paper, etc.), colored paper, SC manila board, peel coating paper, embossed paper, printing paper, and other specialty paper can be selected. In addition, laminate papers and aluminum vacuum deposited papers (Vacuum Metallized Paper) in which such papers and metal / nonmetals such as plastic films or aluminum foil are laminated may also be used.

(2) Heaven

Laminates including a woven fabric and a nonwoven fabric made of polyester, cotton, T / C, nylon, rayon, and the like may be used.

(3) Films

The material is not particularly limited as long as it is a plastic film that can withstand the foaming temperature (60-300 ° C.).

(4) other

It will not specifically limit, if it is nonferrous metals, such as aluminum, copper, bronze, and brass in a planar or roll state, metals, such as stainless steel and steel, flat glass, etc., and other planar materials.

[Base sheet foam coating method]

1 is a flow chart for explaining a foam coating method according to the present invention. First, an aqueous foaming solution containing thermally expandable microsphere particles is prepared as described above (step S100). Then, the aqueous foaming solution is coated with a pattern of a desired shape on the base sheet by a silk screen method, a gravure method, or a flexo method, or the entire surface of the base sheet (S110 step). And foamed while heating to dry at a suitable temperature, for example 60 ℃ ~ 300 ℃ (S120 step). Then, the uneven pattern is formed in a pattern of a desired shape on the substrate or a foam surface is formed on the entire surface of the substrate (step S130).

Figure 2 is a cross-sectional view of the foam coating sheet product produced by the foam coating method of the present invention. Referring to Figure 2, it can be seen that the foam portion 210 is formed in a pattern of the desired shape on the base material 200, the height of the foam portion 210 is varied.

Drying and foaming after coating may be effected substantially simultaneously, or firstly a part or all of the water contained in the solvent may first be dried and then heated to the foaming temperature to cause foaming secondary. .

In some cases, the glittering powder may be fixed to the foaming site by adding the glitter powder to the aqueous foaming solution, and the coloring may be imparted to the foaming site by adding pigments such as pigments and dyes to the aqueous foaming solution. In addition, a fluorescent dye / pigment or a photoluminescent dye / pigment may be added to the aqueous foaming solution to impart a fluorescent effect or a luminous effect to the foamed portion.

 According to the present invention, since an organic solvent such as toluene or PVC / plasticizer is included, an environmentally friendly aqueous foaming solution using water as a solvent is used instead of an oily coating solution which has been a problem in the past. In addition, as the crosslinking between the binder and the binder in the aqueous foaming solution and between the binder and the adherend during the drying / foaming process, a strong bonding force is secured, dust is removed even after rubbing the uneven portion by hand after forming the foam irregularities It does not come out can produce a product that is harmless to the human body of the consumer. In addition, since the water contained in the aqueous foaming solution in the drying process is volatilized and foamed, the manufacturing process is simplified and the production cost is reduced.

1 is a flow chart for explaining a foam coating method according to the present invention,

Figure 2 is a cross-sectional view of the foam coating sheet product produced by the foam coating method of the present invention.

Claims (14)

In an aqueous emulsion in which the polymer is emulsified and dispersed in water, expandable polymeric microspheres (EPM) and other additives are added, An aqueous foaming solution, characterized in that the aqueous emulsion comprises at least one selected from styrene butadiene copolymer polymer emulsion series, acrylic polymer emulsion series, vinyl acetate polymer emulsion series, and other aqueous emulsion series. The method of claim 1, wherein the styrene butadiene copolymer polymer emulsion series is a styrene-butadiene copolymer polymer emulsion, a carboxy-styrene-butadiene copolymer polymer emulsion, a styrene-butadiene-acrylonitrile copolymer polymer emulsion, a carboxy-butadiene-styrene-acrylo An aqueous foaming solution comprising at least one selected from nitrile copolymer polymer emulsion and other styrene-butadiene polymer emulsions. The method of claim 1, wherein the acrylic polymer emulsion series comprises at least one selected from acrylic polymer emulsions, styrene-acrylic copolymer polymer emulsions, cross-linked acrylic-styrene copolymer polymer emulsions, and other acrylic polymer emulsions. An aqueous foaming solution, characterized in that made. The vinyl acetate polymer emulsion series of claim 1, wherein the vinyl acetate polymer emulsion series comprises at least one selected from ethyl vinyl acetate polymer emulsion, ethyl vinyl acetate-acrylic copolymer polymer emulsion, vinyl acetate polymer emulsion, and other vinyl acetate emulsions. Aqueous foaming solution. The glass transition temperature (Tg) of claim 1, wherein the other aqueous emulsion series is a rubber latex emulsion, another latex emulsion, a polyurethane emulsion, a petroleum resin emulsion, a rosin emulsion, a rosin ester emulsion, and a polymer that is emulsifiable and dispersed in water. An aqueous foaming solution comprising at least any one selected from an aqueous emulsion prepared by emulsifying and dispersing a polymer having a temperature of 50 ° C. or less in water. The aqueous foaming solution of claim 1 is coated with a desired pattern or the entire surface on a sheet, followed by drying and foaming, so that the water contained as a solvent in the aqueous foaming solution is volatilized, Base sheet foam coating method characterized in that the front coating is made. 7. The foam coating method of claim 6, wherein the coating of the aqueous foaming solution is made of a silk screen method, a gravure method, or a flexo method. 7. The foaming coating method of the base sheet according to claim 6, wherein the foaming is performed in a temperature range of 60 ° C to 300 ° C. 7. The foam sheet coating method according to claim 6, wherein the drying and foaming occur substantially simultaneously. 7. The method of claim 6, wherein the drying occurs first and the foaming occurs secondly. 7. The foam coating method of claim 6, wherein the coating and foaming are performed after the addition of the glitter powder to the aqueous foaming solution. The method of claim 6, wherein the coating and foaming is performed after the addition of pigments, such as pigments and dyes to the aqueous foaming solution to give a color to the foaming part of the base sheet foam coating method. 7. The foam coating method of claim 6, wherein a fluorescent dye / pigment or a photoluminescent dye / pigment is added to the aqueous foaming solution to impart a fluorescent effect or a luminous effect to the foamed portion. A foam coating sheet product, characterized in that produced by the base sheet foam coating method of claim 6.

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