JPH07122240B2 - Wallpaper for clean room - Google Patents

Description

Detailed Description of the Invention

 Purpose of the invention

[Industrial applications]

TECHNICAL FIELD The present invention relates to a wallpaper to be attached to a wall of an industrial clean room.

2. Description of the Related Art In the case of applying industrial clean room wallpaper, inorganic panels such as asver and grasall have been widely used. This type of panel is heavy, laborious to construct and expensive. Synthetic resin wallpaper is light, easy to install and inexpensive, but still unsatisfactory in the degree of cleanliness it can achieve.

[Problems to be Solved by the Invention]

In view of the above-mentioned state of the art, an object of the present invention is a wallpaper that is light and easy to apply and has low cost, and has excellent surface physical properties such as stain resistance, abrasion resistance and solvent resistance, and is clean. It is to provide what meets the demand of the degree. Structure of the invention

[Means for solving problems]

The clean room wallpaper of the present invention basically contains a conductive filler on a wallpaper base sheet 1 in which a polyvinyl chloride layer 12 is laminated on a paper base 11 as shown in FIG. The cured resin layer 2 is provided. In another aspect, as shown in FIG. 2, the wallpaper base sheet 1
An adhesive layer 3, a polyester film 4, and a cured resin layer 2 containing a conductive filler are provided in this order on the polyvinyl chloride layer 12. Flame-retardant paper for wallpaper backing is most suitable as the paper base material. In addition, any thin paper, bleached kraft paper, titanium paper, linter paper, or any other paper commonly used for wallpaper may be used. As the adhesive, a commonly used polyurethane, ethylene-vinyl acetate copolymer, or the like is used, and adhesion is performed by dry lamination, wet lamination, plus lamination, or the like. Conductive fillers include tin oxide and indium oxide.
Powders of non-metal, transparent, electrically conductive materials such as tin are preferred. Carbon powder can be used, but it is limited by the color of the product wallpaper. Examples of the curable resin include thermosetting resins such as epoxy resin, phenol resin and unsaturated polyester resin, ultraviolet curable resins such as acrylic resin, acrylic modified resin and polyester resin, and ethylene-vinyl acetate copolymer, An appropriate electron beam curable resin such as a saturated polyester resin, an acrylic resin, an acrylic modified resin, or a copolymer of ethylene and acrylic acid or its ester is selected and used. The layer of the curable resin containing the conductive filler is formed by applying a liquid curable resin mixed with the conductive filler by an arbitrary means such as gravure coating or roll coating and then curing it.

[Work]

By pursuing the reason why the conventional synthetic resin wallpaper type wallpaper cannot achieve high cleanliness, it was found that the synthetic resin rarely emits dust from itself, but dust in the air flow adheres and accumulates. Adhesion is believed to be primarily due to static electricity. Therefore, the clean room wallpaper of the present invention is provided with a layer of a cured resin containing a conductive filler on the surface. This prevents dust from adhering to the surface without being charged. The cured resin has good surface properties such as stain resistance, abrasion resistance, and solvent resistance, and this wallpaper has such characteristics. The paper base material that constitutes the wallpaper base sheet broadens the range of adhesives used when applying the wallpaper, and the polyvinyl chloride layer makes the wallpaper flexible and easy to handle. In the aspect in which the layer of the cured resin containing the conductive filler is provided on the polyester film, even if the resin is thermoset at a high temperature using a thermosetting resin, the wallpaper base sheet below is sufficiently damaged. It can be cured, and the characteristics of the cured resin can be fully utilized.

Example 1 A white polyvinyl chloride paste was prepared with the following composition. (“Parts” are all parts by weight) Polyvinyl chloride “G-121” (Nippon Zeon) 50 parts Polyvinyl chloride “G-103ZX” (Nippon Zeon) 20 parts Plasticizer Dioctyl phthalate 35 parts Calcium carbonate 20 parts Titanium oxide 10 parts Stabilizer 4 parts Total 139 parts ^On a flame-retardant paper for backing paper with a basis weight of 80 g / m ² , apply the above paste to a thickness of 300μ using a comma coater and apply a temperature of 1
It was gelled by heating in an oven at 80 ° C for 1.5 minutes. A thermosetting resin ink and a curing agent having the following composition containing a conductive filler were prepared. (Ink) Tin oxide conductive powder 30 parts Acrylic polyol "Thermolac U230" (Soken Chemical)
23 parts Vinyl chloride-vinyl acetate copolymer "Vinylite VAGH" (UCC) 2.5 parts Melamine resin "Cymel 370" (Cyanamide) 3 parts Dispersant 1 part Microsilica 1 part Methyl ethyl ketone 7.5 parts Butyl acetate 12 parts Toluene 11 parts Methyl isobutyl ketone 6 parts Total 97 parts (Curing agent) Paratoluene sulfonic acid 40 parts Isopropanol 60 parts Total 100 parts On top of the white polyvinyl chloride layer described above, the above ink
Gravure coating is applied to 100 parts with 5 parts of the above-mentioned curing agent to a thickness of 2μ after drying, and the temperature is set to 150.
It was cured by heating in an oven at ℃ for 15 seconds. The obtained wallpaper for clean rooms had a white matte surface, and the surface resistance was measured to be 6.3 × 10 ⁶ Ω / □. The dirt on the magic and ballpoint pen was completely wiped off with methyl ethyl ketone or benzine. The nails were not scratched and no longer affected by benzine, methyl ethyl ketone, toluene, etc. Flameproof performance is "class 2 flameproof"
It was equivalent to passing.

Example 2 In the same manner as in Example 1, a layer of white polyvinyl chloride was formed on the flame-retardant paper for backing wallpaper. A thermosetting resin ink containing a conductive filler having the following composition was prepared. Tin oxide conductive powder 30 parts Polyester resin “Byron 200” (Toyobo) 7.5 parts Melamine resin “Cymel 370” 20 parts Dispersant 1 part Microsilica 1 part Methyl ethyl ketone 13 parts Toluol 27.5 parts Total 100 parts Thickness 12μ transparent On a polyester film, 100 parts of the above ink and 5 parts of the same curing agent as in Example 1 were gravure coated to a thickness of 2μ after drying,
It was cured by heating in an oven at a temperature of 140 ° C. for 20 seconds. Adhesive "Hybon 7662" (Nippon Kasei Polymer) was applied to the other surface of the above polyester film at 30 g / cm ² (wet), and this surface and the above-mentioned white polyvinyl chloride surface were superposed and dry laminated. .. The obtained wallpaper for clean rooms exhibited the same performance as the product of Example 1. EFFECTS OF THE INVENTION The clean room wallpaper of the present invention can achieve high cleanliness with less dust adhesion. This wallpaper has excellent surface properties such as stain resistance, abrasion resistance, and solvent resistance, and of course it is light and easy to apply, and the cost is low.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing the basic configuration of the clean room wallpaper of the present invention. FIG. 2 is a sectional view similar to FIG. 1, showing the configuration of another aspect of the clean room wallpaper of the present invention. 1 …… Wallpaper base sheet 11 …… Base sheet 12 …… Polyvinyl chloride layer 2 …… Cured resin layer containing conductive filler 3 …… Adhesive layer 4 …… Polyester film

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Claims (2)

[Claims] 1. A wallpaper for a clean room in which a cured resin layer containing a conductive filler is provided on a polyvinyl chloride layer of a wallpaper base sheet in which a paper base material and a polyvinyl chloride layer are laminated. 2. A wallpaper for a clean room, comprising an adhesive layer, a polyester film and a layer of a cured resin containing a conductive filler, which are provided in this order on the polyvinyl chloride layer of the wallpaper base sheet.