JPH06270314A - Foamable wall paper with uneven part and manufacture thereof - Google Patents

Abstract

PURPOSE:To form a wall paper having at least properties of a vinyl chloride resin wall paper by using a material except the vinyl chloride resin by foaming and forming an uneven part a layer made of resin obtained by mixing colorant, antioxidant, ultraviolet absorber, foaming agent with olefin resin laminated on a base material. CONSTITUTION:Additive to be mixed with olefin resin to be melted and extruded may be that used to normally melt and extrude olefin resin. For example, colorant may be used to be mixed so as to be required for inorganic pigment such as azolate. Inorganic material such as titanium oxide, etc., can be added as filler. An antioxidant is added to improve weather resistance of the obtained wall paper such as phenol series. Ultraviolet absorbent is added to improve weather resistance of the obtained such as benzophenone series, etc. Foaming agent is added wall paper in order to impart quantity feeling to the wall paper, such as azo series, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foamed wallpaper having irregularities for use in building interiors and the like, and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, vinyl chloride resin wallpaper has been the most common wallpaper used for the above-mentioned purposes. However, it is said that vinyl chloride resin causes acid rain and dioxins due to the generation of toxic chlorine gas in the human body during fire and chlorine gas generated during incineration.
From the viewpoint of environmental issues, wallpaper that does not use vinyl chloride resin is being demanded. However, resin wallpaper other than vinyl chloride resin satisfies the balance of properties such as moderate flexibility required for wallpaper, ease of embossing, chemical resistance, stain resistance, weather resistance, and volume feeling due to foaming. There was nothing to do.

As a means for solving these problems of using vinyl chloride resin, attempts have already been made in the field of packaging materials to melt-extrude a resin having physical properties similar to those of vinyl chloride resin.
However, the resins described in these have not satisfied the moderate flexibility of vinyl chloride resin wallpaper and the ease of embossing.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems. The problem is that a vinyl chloride resin wallpaper is made using a material other than vinyl chloride resin. It provides a wallpaper with properties equal to or better than the properties of.

[0005]

In order to solve the above problems, the present invention comprises a resin in which a colorant, an antioxidant, an ultraviolet absorber and a foaming agent are mixed with an olefin resin laminated on a substrate. The layer is provided with a foamed wallpaper having irregularities characterized by being foamed and irregularized.The production method thereof is as follows: melt-extruding, heat-foaming simultaneously, and concavo-convex with an irregular roll. It is characterized in that it is cooled and solidified, or melt-extruded at a temperature not higher than the decomposition temperature of the foaming agent, roughened by a concave-convex roll, and then heated and foamed.

A detailed description will be given below with reference to the drawings. FIG. 2 shows a cross-sectional structure of the foamed wallpaper 10 having irregularities according to the present invention. The substrate 1 is not particularly limited as long as it is a backing paper for wallpaper and is usually used for wallpaper. It is also possible to apply an anchor coating agent or the like in advance in order to increase the adhesion of the olefin resin.

As the resin 2 to be melt extruded, an olefin resin is used as the main constituent material. In particular, olefin-based heatable elastomer, ethylene-vinyl acetate copolymer resin, ethylene-acrylic acid copolymer resin, polybutene and the like are preferable. The olefin resin specified here is that the olefin resin sheet is superior in stain resistance, solvent resistance, chemical resistance and the like to the vinyl chloride resin sheet, and the flexibility required for wallpaper and low temperature This is because it has excellent workability and the like.

The following additives are mixed with the above olefin resin. Additives are not particularly specified as long as they are used in ordinary melt extrusion of olefin resins. For example, as the colorant, an azo lake-based, quinacdrine-based, phthalocyanine-based organic pigment or an inorganic pigment such as titanium oxide, chromium titanium, red iron oxide, etc. may be arbitrarily mixed and used to obtain a required color. At this time, it is also possible to add an inorganic substance such as titanium oxide, alumina, calcium carbonate or the like as a filler.

The antioxidant is added to improve the weather resistance of the obtained wallpaper. For example, phenol type, phosphorus type, hindered phenol type and the like are preferable.

The ultraviolet absorber is added to improve the weather resistance of the obtained wallpaper. For example, benzophenone type and benzotriazole type are preferable.

The foaming agent is added for the purpose of giving the wallpaper a feeling of volume. A commonly used foaming agent can be used, but azo type, hydrazide type, nitroso type and the like are preferable.

The manufacturing method of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows the steps of one embodiment of the present invention. The resin temperature during melt extrusion varies depending on the resin, but in the case of foaming the resin at the outlet of the extruder 6, it is necessary to reach the decomposition temperature of the foaming agent to be added. The foamed and melt-extruded resin is provided with unevenness and laminated with the base material 1 at the same time by the uneven cooling roll 8.

FIG. 3 shows another embodiment of the present invention. By performing the melt extrusion at a temperature not higher than the decomposition temperature of the foaming agent, the resin melt-extruded without foaming can be provided with unevenness and laminated with the base material by a cooling roll having unevenness as in the case described above. Do at the same time. Then, this is heated and foamed.

According to the method described above, a method in which a molten resin is put in a mold is used instead of imparting mechanical unevenness like the embossing that is performed with a vinyl chloride resin wallpaper or the like. Therefore, it is possible to give arbitrary irregularities, for example, very fine irregularities such as those used in holograms are included, and there is no irregularity deformation due to heating after imparting irregularities, which is excellent in so-called emboss heat resistance.

Further, for example, a chemical cross-linking agent such as dicumiroperoxide or polysulfonamide is mixed with the resin to be melt-extruded and extruded, and then heated at a temperature not higher than the decomposition temperature of the foaming agent to chemically cross-link the resin surface. By doing
Further, by cross-linking the extruded resin surface with an electron beam before heat-foaming, it is possible to obtain a uniform and high-foaming state.

[0016]

[Function] As described above, the olefin resin in which the colorant, the antioxidant, the ultraviolet absorber, and the foaming agent are mixed on the base material is melt-extruded and laminated using an extruder, and at the same time foaming and cooling and solidification are performed. Furthermore, the extrusion temperature of the olefin resin is performed at a temperature not higher than the decomposition temperature of the foaming agent, and a laminate having unexpanded concavities and convexities is prepared in advance, and the laminate is heated and foamed without using a vinyl chloride resin, In addition, moderate flexibility, ease of embossing, chemical resistance, stain resistance,
A wallpaper having a well-balanced property such as weather resistance and a sense of volume due to foaming becomes possible.

[0017]

【Example】

<Example 1> As a base material, a backing paper for wallpaper of 80 g / m ² was used, on which titanium oxide, titanium yellow, iron oxide,
7 parts by weight of a colorant composed of carbon black or the like, a hindered phenolic antioxidant (manufactured by Johoku Chemical Industry Co., Ltd .:
"JX-1") 0.5 part by weight, benzotriazole-based ultraviolet absorber (Johoku Chemical Industry Co., Ltd .: "JF-79")
1.0 part by weight, 5.0 parts by weight of an azodicarboamide type foaming agent (manufactured by Otsuka Chemical Co., Ltd .: "Uniform AZ") were added to an ethylene-vinyl acetate copolymer resin (manufactured by Mitsui DuPont Polychemical Co., Ltd.): (Everex)) 100 parts by weight, and then melt-extruded at a resin temperature of 150 ° C. using an extruder, and further provided with concavo-convex and laminated with a concavo-convex cooling roll to obtain a foamed wallpaper having a thickness of 5 mm. .

Example 2 A backing paper for wallpaper of 80 g / m ² was used as a base material, and 5 parts by weight of a coloring material composed of titanium oxide, titanium yellow, iron oxide, carbon black, and the like, and a hindered phenol. 0.3 parts by weight of a system antioxidant (manufactured by Johoku Chemical Industry Co., Ltd .: “JX-1”), a benzotriazole-based ultraviolet absorber (manufactured by Johoku Chemical Industry Co., Ltd .: “J”)
F-79 ") 0.5 part by weight, azodicarboamide type foaming agent (manufactured by Eiwa Chemical Industry Co., Ltd .:" Vinylhole ") 8.0
After mixing 100 parts by weight of an olefinic thermoplastic elastomer (manufactured by Nippon Petrochemical Co., Ltd .: "Softlex"), parts are melt-extruded at a resin temperature of 190 ° C. using an extruder, and then a cooling roll is provided with unevenness. To give unevenness. The obtained unfoamed laminate was passed through a heating furnace at 210 ° C. to obtain a foamed wallpaper having a thickness of 12 mm.

The foamed wallpaper obtained in the above examples is not only made of a resin other than vinyl chloride as a material, but also retains appropriate flexibility, unevenness is very sharp and has a sense of volume.
It was also excellent in chemical resistance, stain resistance, solvent resistance, and weather resistance.

[0020]

As described above in detail, since the foamed wallpaper of the present invention does not use vinyl chloride at all, there is no fear of environmental problems, and the physical properties are the same as or equivalent to those of the vinyl chloride wallpaper. That is all. In addition, the effect of the cooling roll that has been designed to have irregularities and the foaming effect are combined, resulting in a wallpaper with a very sharp and uneven volume.

[0021]

[Brief description of drawings]

FIG. 1 is a schematic view showing an example of a method for producing a foamed wallpaper having irregularities according to the present invention.

FIG. 2 is a schematic view of a cross section of a foamed wallpaper having irregularities according to the present invention.

FIG. 3 is a schematic view showing another embodiment of the method for producing a foamed wallpaper having unevenness according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Substrate 2 ... Resin layer 3 ... Uneven part 4 ... Unwinding roll 5 ... Pressing roll 6 ... Melt extruder 7 ... Molten resin 8 ... Cooling roll with uneven pattern 9 ... Release roll 10 ... Uneven pattern Foamed wallpaper having 11 ... Unfoamed extruded laminate 12 ... Heating furnace

Claims (3)

[Claims] 1. A layer comprising a resin, which is formed by mixing an olefin resin with a colorant, an antioxidant, an ultraviolet absorber and a foaming agent, which is laminated on a base material, and is formed by foaming and unevenness. Foamed wallpaper with irregularities. 2. A resin in which an olefin resin is mixed with a colorant, an antioxidant, an ultraviolet absorber, and a foaming agent is melt-extruded on the base material and heated and foamed at the same time. A method for producing a foamed wallpaper having irregularities, which comprises cooling and solidifying. 3. A resin in which an olefin resin is mixed with a coloring agent, an antioxidant, an ultraviolet absorber and a foaming agent is melt-extruded at a temperature not higher than the decomposition temperature of the foaming agent on a base material, and it is roughened by a concavo-convex roll. Then, a method for producing a foamed wallpaper having irregularities, characterized by heating and foaming.