JPH07258995A - Base paper for vinyl wallpaper - Google Patents

Abstract

PURPOSE:To obtain base paper for vinyl wallpaper capable of controlling the hydrogen chloride gas concentration contained in waste gases to a low value even when the vinyl wallpaper rejected as a waste by repapering, etc., is disposed of by incineration. CONSTITUTION:This base paper for vinyl wallpaper is obtained by using base paper prepared by fixing and supporting one or two or more selected from the group of calcium carbonate, magnesium carbonate, dolomite, hydroglosser and hydrotalcite on a fibrous substance consisting essentially of cellulosic fibers as base paper for the vinyl wallpaper. When the vinyl wallpaper is disposed of by incineration, hydrogen chloride generated from vinyl chloride is neutralized with the inorganic powder. As a result, the hydrogen chloride gas concentration in waste gases can be reduced. When the calcium carbonate, magnesium carbonate or dolomite without any self-extinguishing properties is used, flame retardant treatment is carried out so as to enhance the flame retardancy of the base paper.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base paper used for vinyl wallpaper, and more particularly to a base paper for vinyl wallpaper which can reduce or remove hydrogen chloride gas generated when incinerating vinyl wallpaper that has become a waste by refilling. It is about.

[0002]

2. Description of the Related Art In recent years, vinyl wallpaper has been widely used as an interior material for interior decoration as the living space has become more sophisticated and diversified. In particular, vinyl wallpaper is inexpensive and can be subjected to various processes such as printing, embossing, foaming, and the like, and is excellent in designability and abundant color patterns. Vinyl wallpaper is generally manufactured by applying vinyl chloride paste to a base paper, followed by heat foaming and embossing.The base paper is flame-retardant paper treated with a flame retardant or aluminum hydroxide. Highly filled inorganic paper is used.

Generally, wallpaper is replaced in 3 to 5 years, and the stripped wallpaper is landfilled because it is difficult to incinerate it as waste. The reason why it cannot be incinerated is as follows. That is, when the vinyl wallpaper is incinerated, 95% or more of chlorine contained in vinyl chloride is generated as hydrogen chloride. The generated hydrogen chloride directly reacts with the steel material of the incinerator at a high temperature of 600 ° C. or higher to generate iron chloride and corrode the steel material, thus shortening the life of the incinerator. Further, if the hydrogen chloride gas contained in the exhaust gas from the incinerator is diffused into the atmosphere, there is a problem in that it is environmentally unfavorable.

[0004]

In order to prevent the emission of hydrogen chloride gas contained in the incinerator exhaust gas into the atmosphere,
The exhaust gas from the incinerator is usually removed or reduced in hydrogen chloride gas and SO _x gas contained in the exhaust gas by a method such as a dry powder spraying method, a wet spray tower method, and a semi-dry slurry spraying method. However, such a removal method has drawbacks in that a new exhaust gas treatment device is required in addition to the incinerator, and waste water discharged from these exhaust gas treatment devices is also required.

Therefore, an object of the present invention is to provide a vinyl wallpaper base paper which can suppress the concentration of hydrogen chloride gas generated from vinyl chloride to a low level even when waste vinyl wallpaper is incinerated.

[0006]

[Means for Solving the Problems] That is, the base paper for vinyl wallpaper according to the present invention is selected from the group consisting of calcium carbonate, magnesium carbonate, dolomite, hydroglosser and hydrotalcite as a fiber material mainly composed of cellulose fibers. It is characterized by comprising a base paper on which one or more kinds of inorganic powders are fixed and carried by 35 to 90% by weight based on the weight of the base paper.

When a vinyl wallpaper is produced by using the base paper of the present invention, hydrogen chloride generated from vinyl chloride when the vinyl wallpaper is incinerated is treated by the inorganic powder of the above type contained in the base paper. The hydrogen chloride gas in the exhaust gas can be effectively reduced.

Cellulose fibers include bleached softwood kraft pulp (NBKP) and bleached hardwood kraft pulp (LB).
KP), softwood bleached sulfite pulp (NBSP), hardwood bleached sulfite pulp (LBSP), thermomechanical pulp (TMP), groundwood pulp (GP), other wood pulp, etc. can be used, and one or two of these can be used. The above pulps may be appropriately selected and mixed. Further, one or more kinds of synthetic fibers such as polyester fiber, vinylon fiber and polyolefin fiber, or inorganic fiber such as glass fiber and rock wool can be mixed in the pulp,
This can improve the dimensional stability of the base paper.

Calcium carbonate as an inorganic powder used in the present invention can be used in the form of limestone, marble, etc., which are naturally produced in large amounts, and an alkaline carbonate can be added to a solution containing a soluble salt of calcium. It is also possible to use synthetic calcium carbonate obtained artificially by adding Further, as magnesium carbonate, those naturally produced in the form of rhodomagnesium ore and dolomite (CaCO ₃ · MgCO ₃ ) can be used. Hydro Grosser (3CaO
_{· Al 2 O 3 · 6H 2} O) and hydrotalcite _{(Mg 4.5 · Al (OH)} 13 CO 3 · 3.5H 2 O) is a compound either artificially synthesized.

The amount of these inorganic powders fixed and supported, that is, the content thereof, is 35 to 90% by weight, preferably 60 to 80% by weight, based on the weight of the raw paper (the total weight of the fibrous substance and the inorganic powder). If the content is more than 90% by weight, the fixing yield of the inorganic powder and the strength of the base paper decrease, which is not preferable. If it is less than 35% by weight, the effect of neutralizing hydrogen chloride gas is poor.

When hydroglosser or hydrotalcite is used as the inorganic powder, these compounds have a temperature (250 to 400) at which the cellulose fiber disappears.
(° C) causes a dehydration reaction to release a large amount of water, making the base paper self-extinguishing and flame-retardant. It may be treated to make it flame-retardant. On the other hand, when calcium carbonate, magnesium carbonate or dolomite is used as the inorganic powder, these compounds do not undergo a dehydration reaction or an endothermic reaction near the temperature at which the cellulose fibers disappear. Therefore, in order to improve the flame retardancy of the base paper, it is necessary to perform a flame retardant treatment with a flame retardant.

As the flame retardant, guanidine sulfamate, guanidine phosphate, ammonium sulfamate,
Condensed phosphoric acid alkyl ester derivative, guanidine sulfate,
Examples thereof include ammonium phosphate and the like, and the flame retardant treatment can be carried out by a method of impregnating the base paper with an aqueous solution or dispersion of these flame retardants. Further, auxiliary materials for papermaking such as starch and sizing agent, or methylol compounds such as vinyl acetate-ethylene-vinyl chloride copolymer, polyacrylamide, dicyandiamide, and melamine can be added and used in combination with the aqueous solution or dispersion of the flame retardant. By impregnating the base paper with a flame retardant treatment agent in an amount of ² to 4 g / m ² , flame resistance can be imparted to the base paper. The term "flame retardancy" as used herein refers to the type of flame resistance defined in JIS A-1322 "Testing Method for Flame Retardancy of Thin Materials for Buildings", and corresponds to any of flame protection 1, 2, and 3 grades. Means what to do.

In producing the base paper for vinyl wallpaper of the present invention, a predetermined amount of the fibrous substance mainly composed of cellulose fibers and the above-mentioned specific type of inorganic powder is mixed, and a retention aid, a binder and the like are appropriately added. A stock is prepared by mixing, and the stock can be made by a usual paper making method such as a Fourdrinier paper machine, a cylinder paper machine, a fourdrinier-cylinder combination paper machine, and a tilted wire paper machine. A cationic polymer or an anionic polymer can be used as the retention aid. As the cationic polymer, for example, cationized starch, cationic polyacrylamide, polyethyleneimine, polyamide polyamine epichlorohydrin, cationic guar gum, cationic polyvinyl alcohol and the like can be used. As the anionic polymer, for example, polyacrylamide, polymethacrylamide, oxidized starch or the like can be used, and it is not particularly limited.

[0014]

The present invention will be described in detail below with reference to examples, but the present invention is not limited to these examples.

Example 1 After disintegrating NBKP, it was beaten to 300 mlcsf by a conventional method, and calcium carbonate (limestone) pulverized and adjusted to have an average particle diameter of 3 μm was added as an inorganic powder in an amount of 35% by weight based on the weight of raw paper. Fiber (diameter 1.
4d x fiber length 5mm, made by Unitika) 2 per total weight
Wt% was added. To this mixture, 0.1% by weight of "Epinox" (trade name, manufactured by Japan PMC, polyamide polyamine epichlorohydrin) as a cationic retention aid, and "Percoll 173" as an anionic retention aid.
0.01 wt% (trade name, manufactured by Allied Colloid Co.) and 0.3 wt% of alkyl ketene dimer (manufactured by Arakawa Chemical Co., Ltd.) as a neutral sizing agent were added to prepare a paper stock. A base paper having a basis weight of 135 g / m ^{2 was made} from this stock material. Next, this base paper was impregnated with an aqueous flame retardant solution consisting of 80 parts by weight of vinyl acetate / ethylene / vinyl chloride copolymer, 20 parts by weight of polyacrylamide, 20 parts by weight of melamine resin and 168 parts by weight of guanidine phosphate by a size press method, and then dried. Then, a base paper for vinyl wallpaper was manufactured. The amount of the flame retardant impregnated at this time was 4.5 g / m ² .

A vinyl chloride paste sol having the following composition was applied to the base paper obtained as described above by a doctor blade coater to a thickness of 0.15 mm, and then the paste was semi-gelled through a heating furnace at 145 ° C., and then 210 ° C. A vinyl wallpaper was produced by expanding the foam in a heating furnace of about 5 times, cooling, reheating with an infrared heater, and embossing with a die roll.

Vinyl chloride paste sol formulation Vinyl chloride paste resin 100 parts by weight DOP (plasticizer) 50 parts by weight TCP (flame retardant plasticizer) 10 parts by weight Ba-Zn (stabilizer) 3 parts by weight ADCA (foaming agent) 3 parts by weight Parts Calcium carbonate (filler) 50 parts by weight Sb ₂ O ₃ (flame retardant) 3 parts by weight Titanium oxide (pigment) 20 parts by weight The viscosity of the above composition is adjusted with mineral spirits to 8000.
Centipoise (25 ° C.) paste sol was used.

Examples 2 to 6 A base paper for vinyl wallpaper was prepared in the same manner as in Example 1 except that the addition amount of calcium carbonate (limestone) per weight of the base paper and the coating amount of the flame retardant were changed as shown in Table 1. Was produced, and a vinyl wallpaper was produced using this base paper.

Examples 7 to 9 Magnesium carbonate pulverized and adjusted to have an average particle size of 3 μm was used as the inorganic powder, and the addition amount and the flame retardant coating amount per base paper weight were changed as shown in Table 1, respectively. A vinyl wallpaper base paper was produced in the same manner as in Example 1, and a vinyl wallpaper was produced using this base paper.

Example 10 As Example 1 except that as an inorganic powder, 73% by weight of dolomite pulverized and adjusted to an average particle size of 3 μm was added based on the weight of the base paper, and the flame retardant coating amount was 3.0 g / m ^2. Similarly, a base paper for vinyl wallpaper was manufactured, and a vinyl wallpaper was manufactured using this base paper.

Example 11 Vinyl was prepared in the same manner as in Example 1 except that 70% by weight of hydroglosser pulverized and adjusted to have an average particle diameter of 3 μm was added as an inorganic powder, and no flame retardant was applied. A base paper for wallpaper was manufactured, and a vinyl wallpaper was manufactured using this base paper.

Example 12 In the same manner as in Example 1 except that 73 wt% of hydrotalcite pulverized and adjusted to have an average particle size of 3 μm was added as an inorganic powder, and no flame retardant was applied. A vinyl wallpaper base paper was produced, and a vinyl wallpaper was produced using this base paper.

Comparative Example 1 NBKP was disintegrated and beaten to 300 mlcsf by a conventional method, and 60% by weight of aluminum hydroxide (manufactured by Showa Light Metal Co., Ltd.) having an average particle diameter of 1 μm was used as an inorganic powder.
Polyester fiber (diameter 1.4
d × fiber length 5 mm, manufactured by Unitika) was added at 2% by weight based on the total weight. To this mixture, 0.1% by weight of "Epinox" as a cationic retention aid and "Percoll 173" as an anionic retention aid were added.
A paper stock was prepared by adding 01 wt% and 0.3 wt% of an alkyl ketene dimer (manufactured by Arakawa Chemical Co., Ltd.) as a neutral sizing agent. A base paper having a basis weight of 135 g / m ^{2 was made} from this stock material. Next, 80 parts by weight of vinyl acetate / ethylene / vinyl chloride copolymer, 20 parts by weight of polyacrylamide, 20 parts by weight of melamine resin, 16 parts of guanidine phosphate were added to the base paper.
After impregnating 8 parts by weight of a flame retardant aqueous solution by a size press method, it was dried to produce a base paper for vinyl wallpaper.
The amount of the flame retardant impregnated at this time was 1.5 g / m ² . A vinyl chloride paste sol having the same composition as that used in Example 1 was applied to the base paper obtained as described above in the same manner as in Example 1, and then heat semi-gelling, heat foaming, and embossing were performed in the same manner. Made vinyl wallpaper.

Comparative Example 2 Vinyl was prepared in the same manner as in Comparative Example 1 except that the amount of aluminum hydroxide added per base paper weight was changed to 72% by weight and the amount of flame retardant applied was changed to 1.0 g / m ^2. A base paper for wallpaper was manufactured, and a vinyl wallpaper was manufactured using this base paper.

Comparative Example 3 A vinyl wallpaper base paper was produced in the same manner as in Comparative Example 1 except that the amount of aluminum hydroxide added per the base paper weight was changed to 88% by weight and no flame retardant was applied. A vinyl wallpaper was produced using this base paper.

Comparative Example 4 Pulp NBKP 50% by weight, LBK beaten by a conventional method
30% by weight of P and 20% by weight of GP were mixed, the beating degree of the mixed pulp was set to 350 mlcsf, and a uniform aqueous dispersion slurry was obtained. 0.1% by weight of sulfuric acid band in this slurry
(Vs fiber), 0.3% by weight of "Epinox" (vs fiber)
Was added to prepare a paper stock. 71 g / m2 basis weight from this stock
^{The two} base papers were made into paper. Next, this base paper was impregnated with an aqueous flame retardant solution consisting of 100 parts by weight of guanidine sulfamate, 5 parts by weight of oxidized starch, and 5 parts by weight of a sizing agent by a size press method, and then dried to produce a flame retarding paper. Then
A vinyl chloride paste sol having the same composition as that used in Example 1 was applied to this flame-retardant paper, and heating and semi-gelling were performed in the same manner as described below.
Heat-foamed and embossed to produce vinyl wallpaper. The vinyl wallpapers obtained in the above Examples and Comparative Examples were incinerated in the incinerator according to the following incineration test, and the hydrogen chloride gas in the generated exhaust gas was measured.

Incineration test Put vinyl wallpaper cut into 5 mm square into a porcelain boat,
This boat was put in an annular furnace composed of a porcelain tube having an inner diameter of 50 mm, incinerated at 800 ° C., the generated exhaust gas was collected, and the concentration of hydrogen chloride (HCl) in the exhaust gas was analyzed. The analysis of hydrogen chloride in the exhaust gas was performed by an analyzer specified by JIS K-0107 "Analysis method of hydrogen chloride in exhaust gas" and a mercury (II) thiocyanate absorptiometry.

The HCl removal rate was calculated by the following equation. HCl removal rate (%) = [(A−B) / A] × 100 In the formula, A is the hydrogen chloride concentration in the exhaust gas when only the vinyl chloride paste is incinerated, and B is obtained in Examples and Comparative Examples. Represents the HCl concentration in the exhaust gas when the vinyl wallpaper is incinerated.

The flame retardancy of the base papers obtained in the examples and comparative examples, and the HC of vinyl wallpaper produced using the base papers.
Table 1 shows the 1 removal rate.

[0030]

As is clear from Table 1, the aluminum hydroxide papers (Comparative Examples 1 to 3) excellent in flame retardance, which are often used as base paper for vinyl wallpaper, remove almost all hydrogen chloride generated during incineration. do not do. Further, it can be seen that ordinary flame-retardant paper (Comparative Example 4) does not remove hydrogen chloride. However, in the vinyl wallpaper base paper (Examples 1 to 12) of the present invention in which a specific type of inorganic powder is highly contained, the hydrogen chloride in the exhaust gas is neutralized by the alkaline earth metal compound even if it is incinerated. Therefore, it can be seen that it is reduced because it is performed.

[0032]

As described above, according to the present invention, the base paper for vinyl wallpaper contains calcium carbonate, magnesium carbonate,
By fixing and carrying a predetermined amount of one or more selected from the group consisting of dolomite, hydroglosser and hydrotalcite, it is possible to effectively reduce the hydrogen chloride generated when vinyl chloride burns. it can. As a result, when incinerating the vinyl wallpaper that was turned into waste by refilling, it is possible to reduce the generation of acid rain and dioxins due to hydrogen chloride in the exhaust gas, which is dangerous to be released into the atmosphere, and is excellent in environmental protection. It becomes the material.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication location D21H 5/00 A (72) Inventor Yoshiaki Kabayama 1-10-6 Shinonome, Koto-ku, Tokyo New Oji Paper Co., Ltd. Tokyo Commodity Research Institute (72) Mina Yoshida 1-10-6 Shinonome, Koto-ku, Tokyo Shin Oji Paper Co., Ltd. Tokyo Commodity Research Institute

Claims (2)

[Claims] 1. A fibrous material mainly composed of cellulose fiber, calcium carbonate, magnesium carbonate, dolomite,
A base paper for vinyl wallpaper, which comprises a base paper on which one or more inorganic powders selected from the group consisting of hydrogrossers and hydrotalcites are fixed and carried by 35 to 90% by weight based on the weight of the base paper. 2. The base paper for vinyl wallpaper according to claim 1, wherein the base paper is treated with a flame retardant.