JP3252871B2 - Flame retardant backing paper for antibacterial wallpaper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flame-retardant backing paper for antibacterial wallpaper used as a wall covering material of a building having fungicidal properties.

[0002]

2. Description of the Related Art In recent years, with the spread of cooling and heating, the structure of a house is airtight and poorly ventilated with the spread of cooling and heating. The condition is also given. In particular, ketomium (C. globosum) belonging to the genus Chaetomium is a bacterium with a high cellulose decomposing ability,
It is known that it easily occurs on wallpaper in a house and causes corrosion.

[0003] In general, vinyl wallpaper is produced by laminating a vinyl chloride resin layer on a base material called backing paper and subjecting it to various surface treatments. For backing paper,
Inorganic paper and fire-retardant paper having fire protection performance are used. In order to impart fungicide resistance to such backing paper,
It has been practiced to add a fungicide such as (4-thiazole) -benzimidazole.

It has also been proposed to use a zeolite mineral ion-exchanged with a metal ion having antibacterial and antifungal properties by mixing or spraying it into an adhesive for wallpaper (Japanese Patent Application Laid-open No. Sho.
1-113895).

[0005]

However, as a fungicide to be contained in the backing paper, a fungicide which is highly toxic to humans and animals is often used, and there is a concern about the effect on humans and animals.

[0006] Further, in a case where a zeolite mineral ion-exchanged with metal ions is mixed into an adhesive to bond a backing paper and a vinyl chloride resin layer, an additional step is required with respect to the conventional wallpaper manufacturing process. In addition to the high production costs required, the active ingredients are eluted when the metal ions are in contact with water because of their water solubility, or they may be absorbed by the moisture in the air and flow out. is there.

Therefore, the present invention uses a low-toxic antibacterial substance as an active ingredient, does not elute or leak out the active ingredient during use of wallpaper, and requires an additional manufacturing process for imparting antibacterial properties. The purpose of the present invention is to provide a nonflammable backing paper for antibacterial wallpaper.

[0008]

The flame-retardant backing paper for antibacterial wallpaper of the present invention comprises a fibrous substance mainly composed of cellulose fibers.
70 to 90% by weight of inorganic powder containing 0 to 30% by weight of a poorly water-soluble or water-insoluble antibacterial metal salt as an active ingredient
Wherein the sheet contains the antibacterial metal salt in an amount of 3 to 10% by weight. Things.

In the backing paper of the present invention, the antibacterial metal salt as the active ingredient is firmly and uniformly fixed and carried inside the entangled structure of the fibrous material by papermaking mixed with a fibrous material mainly composed of cellulose fibers. It has been done. Therefore, the antibacterial metal salt powder is fixed to the sheet without falling off. In addition, since the antibacterial metal salt is flame-retardant or insoluble in water, there is no danger of elution or outflow when it comes into contact with water.

Examples of the hardly water-soluble or water-insoluble antibacterial metal salt used as an active ingredient in the present invention include zinc compounds such as zinc oxide, zinc fluoride and zinc stearate, and fluorine compounds such as magnesium fluoride and copper fluorosilicate. And silver oxide. Zinc oxide is particularly preferably used. The above antibacterial metal salt is used as a powder by mixing with an inorganic powder. In addition, one of antibacterial metal salts
The seeds may be used alone, but if necessary, two or more kinds may be used in combination.

In the present invention, as the inorganic powder fixed and supported on the fibrous substance, metal hydrates such as aluminum hydroxide and magnesium hydroxide, and hydrous silicate minerals such as calcium silicate and magnesium silicate can be used. One or more of these may be used as a mixture with the above antibacterial metal salt powder.

The fibrous substance used in the present invention is mainly composed of cellulose fibers such as pulp for papermaking, and if necessary, inorganic fibers such as glass fibers, rock wool fibers, alumina fibers and silica fibers. Alternatively, one or more of organic fibers such as polyester fibers can be used in combination with cellulose fibers.

In the present invention, 70-90% by weight of the above-mentioned inorganic powder (mixture with antibacterial metal salt powder)
Is 10 to 3 of a fibrous substance mainly composed of cellulose fibers.
0% by weight is fixed and carried. 70% by weight of inorganic powder
If less, the resulting sheet will not have sufficient flame retardancy,
On the other hand, if the fibrous substance is less than 10% by weight, the obtained sheet has insufficient strength as a backing paper.

The antibacterial metal salt is contained in the sheet in an amount of 3 to 10%.
% By weight. If it is less than 3% by weight, a satisfactory antibacterial effect is not exhibited, while 10% by weight
If the amount is larger than that, the content of other inorganic powders is reduced, which not only impairs the fire protection performance of the sheet but also increases the material cost.

In producing the backing paper of the present invention, a fibrous substance and an inorganic powder are mixed so as to have a predetermined ratio to form an aqueous suspension, and this is made into a paper using a normal papermaking method. The method can be adopted. In this papermaking process,
Organic binders and binding aids conventionally used in papermaking technology, as well as sizing agents and wet strength agents may be added to the stock as needed.

[0016]

The present invention will be described in more detail with reference to the following examples. In the examples, “parts” and “%” are based on weight.

EXAMPLE After softwood kraft pulp was disintegrated, 3 parts of glass fiber (fiber diameter 6 μm, fiber length 3 mm, manufactured by JEOL Ltd.) was placed on 97 parts of pulp beaten to a freeness of 350 ml using a conventional beater. The stock material was prepared by mixing and dispersing.

The ratio of the fibrous substance and the inorganic powder in the final sheet was determined by the test sheet No. 1 shown in Table 1. A mixture of aluminum hydroxide powder (average particle size: 1 μm, manufactured by Showa Light Metal Co., Ltd.) and zinc oxide powder (manufactured by Sakai Chemical Industry Co., Ltd.) was mixed with the above-mentioned paper stock so as to have a weight ratio (%) of 1-6. And 0.2% of alkyl ketene dimer sizing agent
0.5% (based on the total solids in the stock) and 0.5% (based on the total solids in the stock) of the modified polyamide resin-based wet strength agent were added.

Next, the total solid content in each stock material is 0.75
% Before the papermaking, a polyacrylamide-based binder is added at 0.2% (based on the total solid content in the stock material) before papermaking, and the sheet basis weight becomes 130 g / m ² . A laboratory hand-made square machine (250 x 250 mm)
Paper making.

Table 1 Test sheet No. Fibrous substance Aluminum hydroxide zinc oxide 120 8 0 2 20 79 1 13 20 77 3 4 420 75 5 5 20 72 8 6 35 35 62 3

Each of the test sheet Nos. 1 to
Table 6 shows the results of testing the antifungal effect of No. 6 on the basis of the following methods A and B. Also, JIS A-132
Table 3 shows the results of the flame retardancy test using No. 2.

Mold Resistance Test Method A : The test was carried out in accordance with the test items for general industrial products of JIS Z2911-1981. A mixed spore suspension of the following five molds was prepared and sprayed on each test sheet piece (5 × 5 cm) placed in a sterilized petri dish having a diameter of 9 cm, and cultured. Culture conditions were a temperature of 28 ° C., a relative humidity of 95% or more, and a culture period of 4 weeks.

Aspergillus niger
ger) (FERM S-1) Penicillium funiculosu
m) (FERM S-6) Rhizopus stolonifer (F
ERM S-7) Cladosporiu
m Cladospori oi des) (FERM S-8) Ketomium globosum (FERM
S-11)

The antifungal effect was evaluated according to the following criteria. 3: No hypha was observed in the inoculated portion of the test sheet piece. 2: The area of the hyphal growth part observed in the inoculated part of the test sheet piece does not exceed 1/3 of the total area. 1: The area of the hyphal growth part observed in the inoculated part of the test sheet piece exceeds one third of the total area.

Method B : A potato dextrose agar medium is placed in a petri dish having a diameter of 9 cm, and each of the test sheet pieces cut into 5 × 5 cm is placed thereon and sprayed with a mixed spore suspension of the following five molds. At a temperature of 28 ° C and a relative humidity of 95% or more.
Cultured for a week.

Aspergillus terreus (FERM S-3) Penicillium funiculosum (FERM S)
-6) C. Cladospo
rioides) (FERM S-8) Gliocladium virens (FE
RM S-10) Ketomium globosum (FERM S-11)

The potato dextrose agar medium was prepared as follows. Potato 400 cut into 1cm squares
The g is heated from the water and, once boiled, the heat is reduced and the heating is continued for about 50 minutes so that it does not boil, then filtered through cheesecloth. After adjusting the volume to 1000 ml, 20 g of glucose and 1 g of yeast extract are added. After adjusting the pH to 5.8 with dilute hydrochloric acid, add 18 g of agar and boil until the agar is completely dissolved.

The antifungal effect was evaluated according to the following criteria. -: No mold was observed on the surface of the test sheet piece. +: The mold generated on the surface of the test sheet piece is 10% or less of the entire area. ++: Mold generated on the surface of the test sheet piece is 10 to 30% of the entire area. +++: Mold generated on the surface of the test sheet piece is 30 to 70% of the entire area. +++++: Mold generated on the surface of the test sheet piece is 30 to 100% of the entire area.

Table 2 Mycelial growth test sheet No. A method B method 12 ++ 22 +++ 33 + 43-3-53-3-63 +

Table 3 Test sheet No. 1 2 3 4 5 6 Heating test (second) 10 10 10 10 10 10 10 Carbonization length (mm) Vertical 40 40 45 55 83 105 105 Horizontal 35 36 38 40 43 53 Residual flame time (second) 0 0 0 0 0 0 Remaining None None None None None None Evaluation Good Good Good Good Good Bad

[0031]

As described above, the flame-retardant backing paper for antibacterial wallpaper of the present invention has flame retardancy because it contains 70 to 90% by weight of inorganic powder, and at the same time has poor water solubility as an active ingredient of antibacterial property. Alternatively, since the composition contains a water-insoluble antibacterial metal salt, there is no danger of elution or outflow of the active ingredient even in the case of contact with water.

Furthermore, since the antibacterial metal salt powder can be directly contained at the time of making a flame-retardant backing paper, the production cost is reduced as compared with the conventional method of producing a backing paper impregnated or coated with a fungicide. Since the active ingredient can be contained at a high concentration even in the paper layer, a higher antifungal effect can be obtained.

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Isao Morikawa 1-10-6 Shinonome, Koto-ku, Tokyo Oji Paper Co., Ltd. Product Research Institute (56) References JP-A-60-2798 (JP, A) Hei 3-898 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) D21H 11/00-27/42

Claims (1)

(57) [Claims] 1. A fibrous substance 1 mainly composed of cellulose fibers.
70 to 90% by weight of inorganic powder containing 0 to 30% by weight of a poorly water-soluble or water-insoluble antibacterial metal salt as an active ingredient
Characterized in that the sheet contains the antibacterial metal salt in an amount of 3 to 10% by weight in the sheet.