JP2015142519A - Water absorbing and treating material and method of producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water absorbing and treating material having an excellent water-degradable property and a method of producing the same.SOLUTION: A water absorbing and treating material 1 comprises a granular core part 10 and a coating layer part 20. The coating layer part 20 covers the granular core part 10. The coating layer part 20 contains a water-absorbing polymer 22. The water-absorbing polymer 22 has an average particle diameter of 20 μm or less.

Description

  The present invention relates to a water-absorbing treatment material that absorbs liquid such as human or animal excrement and a method for producing the same.

Patent Document 1 describes an excrement treatment material which is a kind of water absorption treatment material. In this excrement disposal material, a granular core part and a covering layer part covering it are provided. The coating layer portion contains a water-absorbing polymer, and has a function of adhering excrement disposal materials that have absorbed liquids such as urine during use to solidify.
JP 2006-333773 A

  The water-absorbing polymer exhibits adhesiveness when absorbing liquid. For this reason, the water-absorbing polymer can be included in the coating layer portion to increase the solidity of the water-absorbing treatment material after use.

  However, the water-absorbing polymer also has a property of swelling when it absorbs a liquid. The water-absorbing polymer swollen in the coating layer portion blocks water from the outside from reaching the granular core portion. This means that when the used water-absorbing treatment material is poured into a flush toilet and disposed of, the water-disintegrating property of the water-absorbing treatment material (bonded fibers and particles are quickly separated by contact with water and dispersed in water. To reduce the property).

  This invention is made | formed in view of the said subject, and it aims at providing the water absorption processing material excellent in water decomposability, and its manufacturing method.

  The water-absorbing treatment material according to the present invention includes a granular core part, a coating layer part covering the granular core part, and a water-absorbing polymer (including a highly water-absorbing polymer) contained in the coating layer part. The average particle size of the water-absorbing polymer is 20 μm or less.

  In this water-absorbing treatment material, the average particle diameter of the water-absorbing polymer contained in the coating layer portion is 20 μm or less. Here, the average particle diameter means a minimum opening through which particles of 50% by weight or more can pass when a water-absorbing polymer that is an aggregate of a large number of particles is passed through a sieve. Therefore, an average particle diameter of 20 μm or less means that 50% by weight or more of particles can pass when the water-absorbing polymer is passed through a sieve having an opening of 20 μm. Thus, the water-absorbing polymer finely pulverized to an average particle size of 20 μm or less hardly expands during liquid absorption. Therefore, when the water-absorbing treatment material is poured into the toilet after use, the water in the toilet easily passes through the coating layer portion and reaches the granular core portion.

  The method for producing a water-absorbing treatment material according to the present invention includes a step of forming a granular core and a coating covering the granular core by attaching a coating material containing a water-absorbing polymer to the surface of the granular core. Forming a layer part, wherein the water absorbent polymer has an average particle size of 20 μm or less.

  In this production method, the average particle diameter of the water-absorbing polymer contained in the coating material is 20 μm or less. Thus, the water-absorbing polymer finely pulverized to an average particle size of 20 μm or less hardly expands during liquid absorption. Therefore, the water-absorbing treatment material obtained by this manufacturing method exhibits excellent water decomposability because the toilet water easily passes through the coating layer part and reaches the granular core part when it is poured into the toilet after use. Can do.

  ADVANTAGE OF THE INVENTION According to this invention, the water absorption processing material excellent in water decomposability and its manufacturing method are realizable.

It is a schematic diagram which shows one Embodiment of the water absorption processing material by this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the description of the drawings, the same reference numerals are assigned to the same elements, and duplicate descriptions are omitted.

  FIG. 1 is a schematic view showing an embodiment of a water-absorbing treatment material according to the present invention. The water-absorbing treatment material 1 is a water-absorbing treatment material that absorbs a liquid, and includes a granular core portion 10 and a coating layer portion 20. The water absorption treatment material 1 is, for example, an excrement treatment material for pets such as cats and dogs.

  The granular core part 10 has a function of absorbing and retaining a liquid such as urine. The granular core part 10 is only required to be formed into a granular shape and does not have to be a perfect spherical shape. Examples of the shape of the granular core 10 include a columnar body (elongated shape) and a flat shape. Moreover, as a material which comprises the granular core part 10, the water retention material which has water retention performance is used. Examples of the water retention material include papers, fibers, woods, plants, plastics, rubbers, and organic sludge materials. Two or more of these may be used in combination.

  Any kind of paper can be used as long as it is made of pulp. Various waste materials can be used as well as virgin pulp. For example, waste paper waste, sanitary paper waste, toilet paper waste, tissue paper waste, toilet paper waste, dust paper waste, paper cotton waste, paper towel waste, toilet seat waste, newspaper waste, magazine waste, buff powder (mainly in printing companies, Fine paper dust generated during bookbinding cutting and scraping), mechanical pulp waste, chemical pulp waste, titanium paper waste, semi-chemical pulp waste, cotton pulp waste, wood pulp waste, waste paper pulp pulverized material, fluff pulp, Water-absorbing fiber waste, non-woven fabric waste, paper dust generated during non-woven fabric manufacture, paper dust generated during the paper making process, paper dust generated during sanitary material manufacture, waste laminate paper, laminated paper printing waste, laminated paper scraps, cardboard Waste, waste paper (trim loss generated by sanitary materials manufacturers, paper waste generated by paper manufacturers, etc.), wrapping paper, paperboard, used Marks can be used punch waste.

  Further, as the papers, polyvinyl chloride wallpaper classifieds may be used. The PVC wallpaper classification refers to a granular material containing paper obtained by classifying a PVC wallpaper. That is, a wallpaper obtained by removing materials other than paper from a PVC wallpaper by classification is a PVC wallpaper classified. However, since it is difficult to completely remove materials other than paper by classification, it is usual that materials other than paper remain to some extent in the PVC wallpaper classified.

  Fibers are a thread-like substance used as a raw material for cloth and the like, and the type is not limited. Natural fibers or chemical fibers may be used. For example, fiber waste (cotton waste, wool waste, hemp waste, lint waste, cloth waste, cotton waste, waste eyebrows, rayon waste, nylon waste, polyester waste, rope waste) discarded from a textile factory can be used.

  As wood, various kinds of waste wood (waste wood for structures, waste wood generated in the manufacture of wooden products, wooden furniture, wooden pallets, wood scraps, sawdust, barks, packing material waste, board scraps, scrap chips, cutting / Waste wood, pruned branches, wood flour, etc. generated by cutting roots) can be used.

  The plant is not limited to any kind, and may be, for example, plant residue, as well as sasa, bamboo, fallen leaves and cut grass. Here, a vegetable residue means the solid unnecessary thing of the plant used as a raw material in a foodstuff manufacturing industry, a pharmaceutical manufacturing industry, a fragrance | flavor manufacturing industry, or a restaurant. For example, sauce lees, soy sauce, koji kasu, sake lees, beer lees, candy lees, laver lees, starch lees, tofu lees, okara, red bean, tea husk, roasted coffee beans extraction residue, rice / flour, soybean lees , Fruit peel / seed, vegetable waste, medicinal herb residue, oil residue.

  Plastics are solid materials of synthetic polymer compounds (polypropylene, vinyl chloride, polychlorinated biphenyls, polystyrene, polyacetal, polycarbonate, polyethylene, polyamide, polyethylene terephthalate, vinylidene chloride, acrylic resin, polyurethane (urethane foam), biodegradable Any type of plastic is acceptable. Various waste materials may be used as plastics. For example, waste plastics, waste polyurethane, waste polystyrene (including foamed polystyrene), waste agricultural film, scraps of various synthetic resin-based packaging materials, waste photo films, waste plastic containers, wire coating scraps, lining scraps, waste polymers , Paint residue, adhesive residue, waste bakeland (printed substrate, etc.) can be used.

  In addition, separation products rich in plastics of waste materials from excrement disposal materials, separation products rich in plastics of waste materials from disposable diapers (such as the exterior of non-standard paper diapers produced by sanitary materials manufacturers), and separation from plastics from sanitary napkin waste materials. Products, milk pad waste plastic-rich separation products, sweat pad waste plastic-rich separation products, incontinence pad waste plastic-rich separation products, animal bed sheet waste plastic-rich separation products, bedding sheet waste plastic Separation products by rich classification, separation products rich in plastics of mask waste materials, separation products rich in plastics of eye mask waste materials, separation products rich in plastics of waste materials for seat head covers, separation materials rich in plastics of vinyl chloride wallpaper waste materials, pillow cover waste materials Products and synthetic resin fiber waste can also be used .

  In addition, waste disposal material waste, disposable diaper waste, sanitary napkin waste, milk pad waste, sweat pad waste, incontinence pad waste, animal bed sheet waste, bedding sheet waste, mask waste, eye mask waste, seat head cover waste Pillow cover waste can also be used.

  Since plastics have a small amount of ash, when it is used, it is possible to reduce the amount after incineration and to increase the amount of heat generated during incineration.

  Any kind of rubber may be used as long as it is a polymer material excellent in stretchability. Natural rubber or synthetic rubber may be used. Various waste materials may be used as rubbers. For example, waste tires and synthetic rubber waste can be used.

  As the organic sludge, for example, a muddy substance remaining after treatment of factory waste water or the like, or a muddy substance generated in the manufacturing process of various manufacturing industries can be used. For example, papermaking sludge, pulp sludge, sewage sludge, digested sludge (excess sludge), and glue residue can be used.

  When two or more types of water retention materials having different properties are appropriately combined as the core material, the water retention performance can be effectively improved by the synergistic effect of these materials.

  For example, a combination of fluff pulp (paper) and vegetable residue (such as okara), a combination of fluff pulp (paper), vegetable residue (such as okara) and wood (wood flour), fluff pulp (paper) ), Plant residues (such as okara) and organic sludge (pulp sludge), combinations of plant residues (such as okara) and organic sludge (pulp sludge), plastics (vinyl chloride wallpaper) and organic Combination with sludge (pulp sludge) is conceivable.

  Even when a water retention material having a low water retention performance is used, a high water retention performance can be realized by combining with other water retention materials. Therefore, even a material having low water retention performance can be suitably used as a water retention material, so the range of selection of the water retention material is expanded.

  The covering layer portion 20 covers the granular core portion 10. The covering layer part 20 may cover the entire surface of the granular core part 10 or may cover only a part of the surface of the granular core part 10. The covering layer portion 20 has a function of adhering the water-absorbing treatment materials 1 that have absorbed liquids such as urine during use to make them solid.

  The coating layer portion 20 contains a water absorbent polymer 22. The average particle diameter of the water-absorbing polymer 22 is 20 μm or less, more preferably 10 μm or less. As the water-absorbing polymer 22, one pulverized by a jet mill can be used. The weight ratio of the water-absorbing polymer 22 in the covering layer portion 20 is preferably 33% or more and less than 50%.

  An organic material can be used as the main material of the covering layer portion 20. As the organic material, paper powder, wood powder or okara is preferably used. Here, the main material of the covering layer portion 20 refers to a material having the highest weight ratio in the entire material constituting the covering layer portion 20.

  Examples of paper powder include thin paper, thin paper waste, sanitary paper, sanitary paper waste, toilet paper paper, toilet paper waste, tissue paper paper, tissue paper waste, decorative paper paper, decorative paper waste, dust paper paper, dust paper waste, paper Cotton, paper waste, paper towel, paper towel waste, toilet seat waste, mechanical pulp, mechanical pulp waste, chemical pulp, chemical pulp waste, semi-chemical pulp, semi-chemical pulp waste, cotton-like pulp, cotton-like pulp waste, wood Pulp, wood pulp waste, waste paper pulp pulverized material, fluff pulp, water absorbent fiber waste, paper powder containing water absorbent resin, paper powder generated during bookbinding, paper powder generated during non-woven fabric production, paper powder generated in the papermaking process Paper dust generated at the time of manufacturing sanitary materials can be used. Two or more of these may be used in combination.

  Then, an example of the manufacturing method of the water absorption processing material 1 is demonstrated as one Embodiment of the manufacturing method of the water absorption processing material by this invention. This manufacturing method includes a granulation step, a covering step, a sizing step, and a drying step.

  The granulation step is a step of forming the granular core part 10. In this step, the material constituting the granular core 10 (core material) is pulverized to a predetermined size with a crusher, and the pulverized core material is put into a mixer at a predetermined ratio and mixed. After adding water, the core material is extruded and granulated by a granulator. Thereby, the granular core part 10 is obtained.

  The covering step is a step of forming the covering layer portion 20. In this process, the material (coating material) which comprises the coating layer part 20 is made to adhere to the surface of the granular core part 10 using a coating apparatus etc. The coating material contains the water-absorbing polymer 22 described above. The weight ratio of the water-absorbing polymer 22 to the coating material is preferably 33% or more and less than 50%. The main material of the coating material is preferably paper powder, wood powder or okara. Here, the main material of the coating material refers to a material having the highest weight ratio in the entire material constituting the coating material. The coating material can be applied, for example, by spraying or spraying. Thereby, the coating layer part 20 which covers the granular core part 10 is obtained.

  In the sizing step, the water-absorbing material produced in the previous step is passed through a sieve having a sieve with a predetermined size. Thereby, only the water absorption processing material which satisfy | fills a predetermined specification is extracted.

  In the drying step, the water-absorbing treatment material extracted in the previous step is dried with a dryer. By appropriately adjusting the moisture content of the granular core part 10 by drying, the moisture of the granular core part 10 can be prevented from transitioning to the coating layer part 20 and the water absorption capacity can be reduced, and the water-absorbing treatment material 1 can be preserved. Occasional generation of mold or the like can be prevented.

  In addition, you may perform a fragrance | flavor addition process after a drying process. In this step, a fragrance is placed in a packaging bag used for bagging the water-absorbing treatment material 1. A fragrance | flavor is injected in a packaging bag with air, for example. Such air injection is performed in order to expand the packaging bag. This step is preferably performed prior to the step of filling the water-absorbing treatment material 1 in a packaging bag (bag filling step).

  Since the said fragrance | flavor adheres to the water absorption processing material 1 within a packaging bag, the water absorption processing material 1 which has aromaticity is obtained. Thus, by putting a fragrance | flavor in a packaging bag, it can prevent that a fragrance | flavor adheres to a manufacturing apparatus in the process before it. Therefore, cleaning of the apparatus after manufacture becomes easy.

  When the fragrance is injected into the packaging bag together with air, it is not necessary to provide a device for putting the fragrance in the packaging bag, separately from the device for injecting air into the packaging bag. Therefore, the water-absorbing treatment material 1 having aromaticity can be obtained while avoiding the complexity of the production equipment.

  When the fragrance | flavor addition process is performed ahead of a bagging process, the water absorption processing material 1 can be stuffed in the state which the fragrance | flavor has spread throughout the packaging bag. Therefore, it becomes easy to attach a fragrance | flavor uniformly to the several water absorption processing material 1 in a packaging bag.

  Moreover, since the fragrance | flavor is injected in the packaging bag, it is useless compared with the case where the fragrance is injected outside the packaging bag (for example, when the water-absorbing treatment material 1 before being packed in the packaging bag is injected). The amount of fragrance can be reduced.

  The effect of this embodiment will be described. In this embodiment, the average particle diameter of the water absorbing polymer 22 contained in the coating layer portion 20 is 20 μm or less. Thus, the water-absorbing polymer 22 finely pulverized to an average particle size of 20 μm or less hardly expands during liquid absorption. Therefore, when the water-absorbing treatment material 1 is poured into the toilet after use, the toilet water easily passes through the coating layer portion 20 and reaches the granular core portion 10, so that it can exhibit excellent water decomposability.

  Further, the finely pulverized water-absorbing polymer can suppress the expansion at the time of liquid absorption, while increasing the adhesiveness. For this reason, the water-absorbing treatment material 1 is excellent not only in water decomposability, but also in terms of solidity.

  When the average particle diameter of the water-absorbing polymer 22 is 10 μm or less, the water-absorbing polymer 22 is further prevented from expanding, and the adhesiveness is further increased. Therefore, more excellent water disintegration and solidification properties can be obtained. As described above, by reducing the particle size of the water-absorbing polymer 22, water decomposability and cohesiveness can be improved. On the other hand, if an attempt is made to obtain a water-absorbing polymer 22 having a particle size that is too small, a special device or the like is required, leading to an increase in the manufacturing cost of the water-absorbing treatment material 1. From this viewpoint, the average particle diameter of the water-absorbing polymer 22 is preferably 1 μm or more.

  When the weight ratio of the water-absorbing polymer 22 in the coating layer portion 20 (coating material) is 33% or more, a relatively large amount of the water-absorbing polymer 22 is contained in the coating layer portion 20, so that the water-absorbing treatment material 1 can be improved.

  In this regard, in the conventional water-absorbing treatment material, when the content of the water-absorbing polymer is increased, the solidification property is improved while the water disintegration property is remarkably lowered. This is because the swollen water-absorbing polymer is significantly affected by blocking water from the outside (for example, toilet water). Thus, in the conventional water-absorbing treatment material, the improvement in the solidification property and the improvement in the water disintegration have to be in a trade-off relationship. On the other hand, in this embodiment, since the swelling of the water-absorbing polymer 22 is suppressed by reducing the particle size, even if the content of the water-absorbing polymer 22 is increased, the water from the outside does not absorb the water-absorbing polymer 22. 22 is difficult to be blocked. For this reason, it is possible to eliminate the trade-off relationship described above, and to improve the solidity while suppressing a decrease in water disintegrability.

  When the water-absorbing polymer 22 pulverized by a jet mill is used, the water-absorbing polymer 22 having an average particle size of 20 μm or less and a small variation in particle size can be easily obtained.

  When the main material of the coating layer part 20 (coating material) is paper powder, wood powder, or okara, these materials are suitable for quickly moving water from the outside to the granular core part 10, It contributes to the improvement of the water disintegration property of the water absorption treatment material 1.

DESCRIPTION OF SYMBOLS 1 Water absorption processing material 10 Granular core part 20 Coating layer part 22 Water absorbing polymer

Claims (10)

A granular core;
A coating layer covering the granular core;
A water-absorbing polymer contained in the coating layer portion,
The water-absorbing treatment material, wherein the water-absorbing polymer has an average particle size of 20 μm or less. The water-absorbing treatment material according to claim 1,
The water-absorbing treatment material has an average particle diameter of 10 μm or less. In the water absorption treatment material according to claim 1 or 2,
The water absorption processing material whose weight ratio of the said water absorbing polymer to the said coating layer part is 33% or more. In the water absorption processing material in any one of Claims 1 thru | or 3,
The water-absorbing polymer is a water-absorbing treatment material pulverized by a jet mill. In the water absorption processing material in any one of Claims 1 thru | or 4,
The main material of the coating layer portion is a water-absorbing treatment material that is paper powder, wood powder, or okara. Forming a granular core; and
Forming a coating layer covering the granular core by attaching a coating material containing a water-absorbing polymer to the surface of the granular core, and
The method for producing a water-absorbing treatment material, wherein the water-absorbing polymer has an average particle size of 20 μm or less. In the manufacturing method of the water absorption processing material of Claim 6,
The water-absorbing polymer has a mean particle size of 10 μm or less. In the manufacturing method of the water absorption processing material of Claim 6 or 7,
The method for producing a water-absorbing treatment material, wherein a weight ratio of the water-absorbing polymer to the coating material is 33% or more. In the manufacturing method of the water absorption processing material in any one of Claims 6 thru | or 8,
The method for producing a water-absorbing treatment material, wherein the water-absorbing polymer is pulverized by a jet mill. In the manufacturing method of the water absorption processing material in any one of Claims 6 thru | or 9,
The main material of the said coating material is a manufacturing method of the water absorption processing material which is paper powder, wood powder, or Okara.

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