JPH01201600A - Production of deodorizing paper - Google Patents

Abstract

PURPOSE:To obtain a deodorizing paper having excellent water resistance and thermal processability, etc., by using a process for making a pulpy fiber from a polymer raw material mixed with fine powder of a deodorizing agent, a process for making a paper from the pulp and a process for activating the pulpy fiber and/or the paper. CONSTITUTION:A deodorizing paper is produced by using a process for making a pulpy fiber by pulping a polymer raw material mixed with fine powder of a deodorizing agent, a process for making a paper from the pulp produced by the above process and a process for activating the pulpy fiber and/or the paper by exposing the fiber, etc., to an atmosphere containing activation source. The fine powder of deodorizing agent is preferably composed mainly of a mixture of titanium dioxide and zinc oxide and contains a certain amount of water. The activation source is e.g. ion, radical, electron, atom., laser light, radiation, ionizing radiation, ozone, etc.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention contains a fine powder deodorizing agent and can exhibit excellent deodorizing power, and has excellent heat processability, water resistance, dimensional stability, and weather resistance. The present invention provides a method for producing deodorizing paper that also has excellent chemical resistance.

BACKGROUND OF THE INVENTION As life becomes more affluent, the demand for removing odors has expanded from so-called bad odors to even the most familiar odors in daily life.

For this reason, deodorizing agents are being actively developed, and substances far superior to conventional activated carbon are being produced one after another.

In addition, these deodorizing agents are not simply used by bagging them in air-permeable bags, but they can also be added to paper stock and made into paper, or impregnated into base paper to make deodorizing paper and use it in various ways. There is also a movement to process and use it.

Problems to be Solved by the Invention By the way, whether it is added to the stock and used to make paper or coated on the surface of base paper, binders are required. The powdered deodorizing agent is coated with this binder and is used as deodorizing paper. This prevents direct contact with odor components,
It cannot be said that the deodorizer is not fully demonstrating its original ability.
In addition, paper made only from natural pulp has poor thermal processability.
Water resistance, dimensional stability, weather resistance, chemical resistance, etc. may not be sufficient in some cases, and no matter how high the deodorizing power is, there is a limit to its use.

Means for Solving the Problems Therefore, the method for producing deodorizing paper of the present invention involves a synthetic pulping process of obtaining pulp-like* pulp from a polymer raw material mixed with a fine powder deodorizing agent, and a process of converting the obtained fibers into paper stock. The fibers or base paper are treated in an atmosphere in which active species are present in either or both of the paper-making process, the synthetic pulping process, and the paper-making process, or the paper state after the paper-making process. The method is characterized by comprising a step of exposing it to.

Action ions, radicals, electrons, atoms, laser light, radiation,
Among them, active species such as ionizing radiation or ozone can melt, evaporate, oxidize, erode. Moreover,
By controlling the power at that time and scanning, it is possible to finely etch the surface of the object or create y&pores on the entire surface.

As a target object, pulp fiber containing a fine powder deodorizing agent or paper made from this as a paper stock is exposed to an atmosphere in the presence of these active species, so that the fiber and paper surfaces are etched and micropores are formed. , the film of fibers and binders that prevent direct contact between the fine powder deodorizer and the atmosphere is destroyed before it loses its original function as paper.

This exposes a portion of the fine powder deodorizer to the atmosphere,
With more opportunities for direct contact with odor components, the fine powder deodorizer exhibits its original performance, and the deodorizing performance of the deodorizing paper improves. Further, if the deodorizing agent is an oxide-based deodorizing agent, it can maintain stable deodorizing power by itself without changing even when exposed to an atmosphere in which active species are present. moreover,
Since synthetic pulp is used for the paper stock, the white paper can be modified.

Example Next, one embodiment of the present invention will be described.

In this example, the deodorizing paper is made of pulp-like fibers, so-called synthetic pulp, containing a fine powder deodorizing agent mainly composed of titanium oxide and zinc oxide, and the paper made from this is subjected to so-called ion processing. This will be explained as surface etching.

Fine powder deodorizers containing titanium oxide and zinc oxide as main ingredients are currently being produced by Titanium Kogyo Co., Ltd. and Nikko Rica Co., Ltd.
It is marketed as a TZ deodorizer, and is mainly composed of titanium dioxide and zinc oxide, and contains some water components, and is used as a guideline for comparative evaluation of deodorizing power. It is a fine white powder that has particularly excellent concentration adsorption properties, and it deodorizes by reducing odor molecules to lower molecules through catalytic action.In addition, zinc oxide chemically adsorbs acidic gases, and titanium dioxide is thought to physically adsorb alkaline gas. Also, it is obtained by mixing an aqueous solution of a water-soluble titanium compound and a water-soluble zinc compound with an alkaline aqueous solution and drying the resulting precipitate.For example, titanium sulfate,
The molar ratio of titanium compounds and zinc compounds, such as titanium chloride, titanium nitrate, zinc sulfate, zinc chloride, zinc nitrate, etc., is 7 = 3 ~
Sodium hydroxide,
Alkaline aqueous solutions such as potassium hydroxide, barium hydroxide, and ammonia are mixed in part or in whole at a reaction temperature of 40 to 60°C, with a final pH in the range of 7 to 9, and the resulting precipitate is reduced to 150°C. It is said that those dried at ~220°C are suitable.

In addition, as paper stock, sizing agents, fillers, binders, etc. should be appropriately selected and blended with the pulp depending on each use of the paper, but the present invention does not include synthetic pulp as detailed below. In the embodiment, LBKP, N
'BKP, a polyethylene synthetic pulp, a sizing agent Suizpine SPK manufactured by Arakawa Chemical Co., Ltd., a wet paper strength enhancer Kymen 557 manufactured by Dick Vercules Co., Ltd. as a binder, and a dry paper strength enhancer manufactured by Meisei Chemical Co., Ltd. A mixture of Mayrotube 1430 was used as paper stock.

In any case, when making paper stock, starch,
Melamine resin, urea resin, polyvinyl alcohol, vegetable gum, water-soluble polymers, etc. are added as a chemical treatment for the purpose of increasing paper strength and improving yield, so these act as binders and create extremely thin layers around the fibers. Although it is a layer, it is in a state of being coated.

Synthetic pulp is produced by, for example, using polyethylene as a raw material, extracting it, stretching it, cutting it, defibrating it, heating it, flashing a heated polymer solution, applying shearing force during the solution polymerization process, etc. Conventionally, methods for pulping are known, but in the present invention, the above-mentioned TZ deodorizing agent is mixed into these raw materials, and the fine powder is almost uniformly dispersed to form pulp-like fibers. However, if the dispersibility is poor, it is possible to have a group that binds to an organic material and a group that binds to an inorganic material in the same molecule, and chemically bind the two. Treated with a so-called coupling agent that improves affinity through reaction, such as a silane coupling agent such as vinyltrichlorosilane, a titanium-based coupling agent such as isopropyl triisoste-70yl titanate, or a surfactant. It is also possible to mix a fine powder deodorizing agent. Therefore, other than mixing a fine powder deodorizing agent with raw materials,
The process is not particularly different from the conventional synthetic pulping process.
Furthermore, the papermaking process is not particularly different from the conventional method.

Here, no matter what kind of polymer is used as the raw material for synthetic pulp, the fine powder deodorizer is mixed into the liquid raw material and made into fibers, so the fine powder deodorizer is mixed with the fiber component polymer. coated. In the example, each fine powder of the TZ deodorizer is coated with polyethylene, although it is an extremely thin layer.

Moreover, when paper is made, as mentioned above, other components in the paper stock act as binders and become coated on top of this film, so simply making synthetic pulp obtained in this way does not result in an excellent deodorizing paper. .

The present invention is characterized in that the film on the fine powder deodorizer is finely etched by exposing it to an atmosphere in the presence of active species, thereby exposing a portion of the fine powder deodorizer to the atmosphere.

Although this may be done at the fiber stage immediately after being made into synthetic pulp, it is more efficient and reliable to do this after the paper has been formed and finished, since the coatings are overlapped due to the above-mentioned circumstances.

Specifically, a high-frequency voltage is applied to an electrode in a low-pressure gas, such as argon gas, to cause a glow discharge, and the paper surface placed on the cathode is bombarded with cations to sputter the paper components, resulting in etching. We performed ion etching, a type of ion processing.

As a result, the surface of the paper was finely etched without any damage to the appearance, and at the same time, the polyethylene component on the TZ deodorizer contained in the fibers was coated on top of it. The coating of binders is also broken, and as a result, a portion of the TZ deodorizer is exposed to the atmosphere and has more opportunities for direct contact with odor components.

On the other hand, since deodorants are originally oxides, they exist stably as they are.

Therefore, the TZ deodorizer has many opportunities to come into direct contact with odor components, so that the TZ deodorizer can exhibit its original performance, and the deodorizing performance as a deodorizing paper is improved.

Furthermore, since not only natural pulp but also synthetic pulp is mixed into the paper stock, heat processability, water resistance, dimensional stability, weather resistance, chemical resistance, etc. can be significantly improved.

Therefore, the polymer of synthetic pulp and its addition amount, as well as
Deodorizing paper with desired characteristics can be obtained by adjusting the degree of exposure to the atmosphere in which the active species is present.
Through various processing such as printing, cutting, and bag making, we can produce products such as shoji paper, wallpaper, closet rugs, sheets, pillow cases,
Various case rugs, lighting umbrellas, fresh food wrapping paper, Japanese clothes storage bags, filters, various packages, posters, calendars, disposable diapers, garbage bags, as well as masks, socks, bags, underwear, shoes, and air purifiers. It can be finished as a filter, etc., and can be used as a material for items that require deodorizing functions.

In particular, since the TZ deodorizer is white, it has excellent opacity and whiteness, and has improved deodorizing performance without impairing the appearance, so it is well suited for printing processing, and its applications can be found in many fields. You can look forward to it.

The present invention has been described above as performing ion etching on paper made from paper stock mixed with synthetic pulp of polyethylene fibers containing a TZ deodorizing agent, but the present invention is not limited to this TZ deodorizing agent. For example, other deodorizers such as natural inorganics, ceramics, activated carbon, metal oxides, etc. can be applied as well, and finely powdered deodorizers are not only contained in the synthetic pulp, but are directly powdered into the paper stock. Of course, even if a deodorizing agent is further added to the paper, it can be applied in the same manner.

In addition, an atmosphere in which active species exist includes ions, radicals, electrons, atoms, laser light, radiation, especially ionizing radiation,
Or, in an atmosphere where active species such as ozone exist as a beam, as a shower, or in a full state, the energy of these active species may be physically, chemically, or mutually affected. This acts secondarily and melts, evaporates, or oxidizes miscellaneous components and binder components to erode them, but in this case, active species are selected and their You can control the energy and etch only the very surface layer,
It is advantageous to be able to scan the surface and create micropores over the entire surface, and in order to process large quantities with uniform quality, ion etching, which is a type of ion processing mentioned above, corona discharge, plasma discharge, Processing techniques such as electron beam processing and laser processing, which have rapidly advanced in recent years, can now be used as special processing in metal and plastic processing. Furthermore, it is possible to easily generate an ozone atmosphere by passing between electrodes with a brush-like aperture on one side and a flat plate electrode on the other to which high voltage is applied, or by applying ionizing radiation such as ultraviolet rays or an ozone atmosphere generated by an ozone generator. It can also be applied by exposing it to oxidation, cracking, etc.
For example, the ozone extraction tube from the ozone generator can be moved slowly while touching the synthetic pulp or paper to allow air to pass through the entire area, the paper can be used like a filter to allow ozone to pass through, or the ozone extraction tube can be connected Just leave it in the container for a while, for example, 1 hour. These active species may be selected depending on their compatibility with the target synthetic pulp or paper.

Further, the polymer of the synthetic pulp is not limited to the polyethylene described in the above embodiment, and other polymers can be used in the same manner as long as they form pulp-like fibers and can be made into paper. Further, the paper according to the present invention is not only a so-called paper but also a bulky material such as a non-woven fabric as long as it is manufactured by papermaking.

Effects of the Invention Therefore, according to the present invention, part of the fine powder deodorizing agent coated with the fiber polymer itself and binders is exposed to the atmosphere, increasing the chance of direct contact with odor components. , it can be expected to improve the deodorizing performance as a deodorizing paper. In addition, since synthetic pulp is used as the pulp, the paper white material can also be provided as a modified product, and the range of uses can be further expanded.

Claims (3)

[Claims] (1) A synthetic pulping process in which pulp-like fibers are obtained from a polymer raw material mixed with a fine powder deodorizing agent, a papermaking process in which the obtained fibers are used as one of the paper stocks, and a synthetic pulping process and a papermaking process. The production of deodorized paper, which comprises the step of exposing the fibers or the paper to an atmosphere in the presence of active species, either in the fiber state during the process or in the paper state after the papermaking process, or both. Method. (2) The method for producing deodorizing paper according to claim 1, wherein the fine powder deodorizing agent is mainly composed of a mixture of titanium dioxide and zinc oxide and contains some water component. (3) An atmosphere in which active species exist is one or more of ions, radicals, electrons, atoms, laser light, radiation, ionizing radiation, ozone, etc. that exist as irradiated, transmitted, or filled with the atmosphere. The method for producing deodorized paper according to claim 1, characterized in that the method is performed under different atmospheres.