JP2009018293A - Method for separation treatment of plastic wallpaper having paper as base material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a separation treatment method which eliminates following difficulties and enabling to recycle a wall paper, since recycling (reuse of resource) is extremely difficult since a bat generated in a manufacturing factory where it is mass-produced or at execution and further the plastic wallpaper discarded accompanying with reforming of a residence or the like are in the state that the paper, i.e., a base material and the plastic are completely closely adhered. <P>SOLUTION: The portion of paper, i.e., the base material of the plastic wallpaper is separated/decomposed using an enzyme commercially available as a fiber modifying enzyme or a cellulolytic enzyme. Recycling of the wallpaper is enabled by separating it from the plastic. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a separation processing method that facilitates recycling (resource reuse) of plastic wallpaper.

Background of the Invention

  The background of the present invention is that a large amount of paper-based plastic wallpaper produced as an interior material is discarded as a large amount of industrial waste at the manufacturing stage, during construction, and during interior reform.

  Moreover, since these products are completely in close contact with the base paper and plastic, they cannot be recycled (resource reuse) by simply separating and separating them.

  Plastics used in these wallpapers are soft polyvinyl chloride (PVC), ethylene vinyl acetate copolymer (EVA), ethylene methyl methacrylate (EMMA), etc., about 90% of which are polychlorinated Vinyl is used.

  Furthermore, in order to give the wallpaper its own texture and soundproofing, organic pyrolysis type such as azodicarbonamide (ADCA), 4,4'-oxybisbenzenesulfonylhydrazide (OBSH), etc. It is manufactured as a foamed product using a foaming agent.

  At present, these products are hardly recycled (resource reuse), and most of them are incinerated or disposed of as industrial waste.

  In particular, when disposing of products that use soft polyvinyl chloride in plastic parts among these products, the problem of dioxins caused by polyvinyl chloride is a problem with recent improvements in incinerator technology. Although it has not been seen, there is concern about the influence of hydrochloric acid, which is an acidic component caused by hydrogen chloride generated by incineration, on the incinerator.

  In addition, when these products are disposed of in landfills, the bulk density is small and the landfill efficiency is not very good because they are foamed products. The paper portion of these products, which are disposed of in landfills, is decomposed by enzymes contained in the soil, but the plastic portion is preserved in the soil for many years.

  JP 2006-75007 A   JP 2006-149343 A

  The above-mentioned disposal of wallpaper is not an appropriate disposal method from the viewpoint of the global environment, and unnecessary wallpaper to be discarded in the future is increasing.

These wallpaper, which are discarded as industrial waste, have been tried, for example, by pulverizing them by mechanical means and separating the plastic part and the paper that is the base material by the difference in specific gravity. Separation is impossible.
Alternatively, attempts have been made to dissolve and separate plastics with a solvent, but problems remain in terms of processing cost and environment.

  In addition, based on the Law for Promotion of Effective Utilization of Resources, use as a PVC wallpaper recycling block (trade name, pine block) is also being promoted.

  The present invention, unlike these treatment methods, focuses on the fact that the main component of the paper substrate of the wallpaper is cellulose fiber, and separates and decomposes them with cellulose-degrading enzyme (fibrinolytic enzyme agent). Then, by completely separating the plastic part and the paper that is the base material, the plastic part is recycled as a recyclable (resource reusable) product, and further separated from the plastic by a cellulose-degrading enzyme (fibrinolytic enzyme). The disassembled paper portion can be converted into recycled paper.

These fibrous substances are decomposed with cellulose-degrading enzymes and further decomposed into sugars (C ₆ H ₁₂ O ₆ ) with saccharifying enzymes, and then fermented with fermenting yeast to produce ethyl alcohol, glycerin, acetone, butanol. It can be converted into a raw material for organic compounds having high added value such as isobutylene, isobutanol, and isobutylene, diisobutylene and isooctane.

  The present inventor focused on extremely difficult wallpaper recycling (resource reuse), and as a result of proceeding with sincerity studies, the subject wallpaper was cut into an appropriate size and dispersed in normal water. It was discovered that it was possible to add a degrading enzyme (fibrinolytic enzyme agent) to completely separate the plastic part and the paper under appropriate conditions.

  It was confirmed that the separated plastic part had a physical property as a reusable plastic by performing simple cleaning and drying.

  The specific means of the present invention is to cut these products to be recycled into appropriate sizes, and for fiber modification fermentations, such as GODO, which are commercially available at a relatively low price in the name of fiber modifiers or fiber treatment agents. TCL (manufactured by Godo Shusei Co., Ltd.), Cellulase “Onozuka” 3S (manufactured by Yakult Yakuhin Kogyo Co., Ltd.), Enchiron CM-40L (manufactured by Tohto Kasei Kogyo Co., Ltd.), Dorrase 20 (manufactured by Kyowa Hakko Kogyo Co., Ltd.) Cellulase A “Amano” 3 (Amano Enzyme Co., Ltd.), etc. are treated according to the specifications of the manufacturer of these products, and the processing temperature and the hydrogen ion concentration are appropriately managed, so that the plastic part and paper Can be completely separated.

  The present invention is an aqueous solution of 0.1 to 20% by weight, preferably 1 to 5% by weight, of these normally commercially available fiber-modifying enzyme agents, and the hydrogen ion concentration pH of the aqueous solution is citric acid, tartaric acid, apple. To confirm the purpose of the present invention by adjusting the pH to 4 to 5 by using 0.005 to 0.02% by weight of a water-soluble organic weak acid such as acid, acetic acid, oxalic acid, succinic acid and gluconic acid. I was able to.

The amount of the wallpaper to be separated with respect to the aqueous solution adjusted in this way varies depending on the expansion ratio of the wallpaper.
In the case of a low foamed product (2 to 4 times), 15 to 25 parts by weight can be charged with respect to 100 parts by weight of the aqueous solution.
In the case of a highly foamed product (5 to 8 times), the charging amount is about 8 to 15 parts by weight with respect to 100 parts by weight of the aqueous solution.

  It is not preferable that the wallpaper intended for separation according to the present invention is supplied by pulverization with a pulverizer because separation from the separated and decomposed paper portion after processing becomes impossible.

Wallpaper of interest according to the invention will depend on the processing equipment scale, ^{2 cm} 2 to 50 cm ² square to facilitate the separation of the plastic part after treatment, preferably cut into ² square about ^{4 cm} 2 ～15Cm However, it is not always necessary to use a regular square.

  By using an appropriate fiber-modifying enzyme agent and an aqueous solution adjusted to an appropriate hydrogen ion concentration, the plastic part and the base paper are almost completely separated, and the plastic part is separated by a mesh of about 1 mesh.

  The plastic part is separated and separated with a fiber-modifying enzyme, and the partially broken fiber paper part uses a synthetic fiber nonwoven fabric or glass fiber filter cloth, and a scraper that can be scraped off. And filter.

  The remaining aqueous solution obtained by separating the plastic and paper portions can be used repeatedly by adjusting the hydrogen ion concentration pH.

  The hydrogen ion concentration pH and reaction temperature during the paper separation work according to the present invention are in accordance with the manufacturer's specifications in order to avoid enzyme deactivation of the degrading enzyme used.

  As described above, the present invention solves the problems associated with landfill processing or incineration processing that are currently mainly performed as a method for recycling (reusing resources) unnecessary wallpaper that is discharged, and is easy and environmentally friendly. This is an economically advantageous treatment method.

  The reaction time required for the separation operation of the plastic wallpaper according to the present invention is as follows: the reaction temperature is set to 50 ° C., the type of plastic used for wallpaper production, the degree of polymerization, the type and amount of plasticizer used, and the expansion ratio Although there are some differences in the degree of embossing and the difference or amount of degradation enzyme, the object of the present invention can be achieved in about 2 hours 30 minutes to 5 hours.

BEST MODE FOR CARRYING OUT THE INVENTION

EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited thereto.
In addition, the Example demonstrated below is limited to the wallpaper made from polyvinyl chloride which occupies 90% of the wallpaper manufactured.

The 100g thing was cut polyvinyl chloride wallpaper (product obtained from Takeno, Ltd.) to about 2 cm ² square, citrate Rakuto Kasei Kogyo Co., Ltd. Enchiron CM-40L water 1L 50 g, as a further pH adjustment 0 After 0.01 g is dispersed in an aqueous solution (pH 4.3) dissolved and stirred at a temperature of 50 ° C. for 3 hours, the plastic portion is separated from the aqueous solution portion decomposed into fibers.

  The separated plastic was simply washed with water and then sufficiently dried to obtain 80.5 g of soft polyvinyl chloride.

  The remaining aqueous solution from which the plastic part was separated was separated by filtering out fibrous paper with a synthetic fiber filter cloth and dried sufficiently to obtain 18.5 g of fibrous material.

  Mixing 100 parts of vinyl chloride resin (degree of polymerization 1100), 50 parts of DINP (di-isononyl phthalate), 2 parts of Ba-Zn liquid stabilizer, 30 parts of soft polyvinyl chloride obtained by fractionation, Kneading was carried out for 5 minutes in two 6-inch test rolls maintained at a surface temperature of 170 ° C., and a uniform soft polyvinyl chloride sheet with no fibrous material having a thickness of 0.5 mm could be obtained. .

  The same separation treatment is performed by adding 0.002 g of citric acid to an aqueous solution having a pH of 5.0 obtained by filtering and separating the plastic portion and the fibrous paper portion to obtain a hydrogen ion concentration pH of 4.3. Thus, the same result as above was obtained.

  In the same manner as described above, the separation operation was performed three times by adjusting the slightly lost water, the necessary decomposing enzyme and the hydrogen ion concentration pH, and the same results could be obtained.

The analysis result of the aqueous solution used for the third time does not detect Ba, 14 ppm, Zn, 50 ppm, Ca, 634 ppm, other heavy metals such as Cd and Pb, and organic tin.
Ba and Zn metal are from the stabilizer for vinyl chloride resin used at the time of wallpaper manufacture. Ca metal is from the filler (calcium carbonate) used for wallpaper plastic parts.

Yakult Pharmaceutical Co., Ltd., fibrinolytic enzyme agent Cellulase “Onozuka” 3S, 50 g and 0.01 g of tartaric acid as a pH adjuster dissolved in 1 L of water and adjusted to pH 5 in an aqueous solution of about 2 cm ² Disperse 80 g of soft polyvinyl chloride highly foamed wallpaper (commercially available product without back paste treatment) cut into pieces, and continue stirring for 5 hours while maintaining the temperature at 50 ° C. The aqueous solution portion is separated.

  The plastic part was washed and thoroughly dried to confirm that the adhered plastic and paper were completely separated.

Claims (4)

  Paper is used as the base material <Cellulose (fibrin), which is the main component of the paper base material for plastic wallpaper, is separated and decomposed by cellulose-degrading enzyme (fibrinolytic enzyme agent), and the plastic part is Separation method that enables recycling of plastic wallpaper produced using paper as a base material by sorting.   The enzyme type of the cellulose-degrading enzyme is cellulase, glucanase, xylanase, hemicellulase, mannanase, pectinase, etc., each of which is 0.1 to 20% by weight, either alone or in combination. Separation treatment method using an aqueous solution.   Water solubility such as citric acid, tartaric acid, malic acid, acetic acid, oxalic acid, oxalic acid, gluconic acid, etc. in order to maintain the required hydrogen ion concentration pH in order to maintain the activity and stability of the above-mentioned cellulase enzymes, etc. Separation process using 0.01 to 0.5% by weight of organic weak acid.   A plastic wallpaper in which paper is used as the base material, the aqueous solution after the separation of the plastic and paper with the aqueous solution prepared in claims 1 and 2 contains the additional water and the cellulose-degrading enzyme required for it. Separation treatment method that enables repeated use by adding and adjusting the hydrogen ion concentration.