WO2007069622A1

WO2007069622A1 - Molded object or molded foam containing water-absorbing/swelling substance, process for producing these, and method of use of these

Info

Publication number: WO2007069622A1
Application number: PCT/JP2006/324803
Authority: WO
Inventors: Tsutomu Uehara
Original assignee: Nisshinbo Industries, Inc.
Priority date: 2005-12-13
Filing date: 2006-12-13
Publication date: 2007-06-21
Also published as: JPWO2007069622A1; CN101336264A

Abstract

[PROBLEMS] To provide a molded object or molded foam formed from a thermoplastic resin composition containing a new water-absorbing/swelling substance. It has a surface having a small contact angle with water and has satisfactory wettability by water. [MEANS FOR SOLVING PROBLEMS] The molded object (1) or molded foam (3) is one formed from a thermoplastic resin composition containing a water-absorbing/swelling substance (2), wherein the substance (2) is present on at least the outer-surface side of the molded object (1) or is present on at least the inner-surface side or on at least both of the inner-surface side and outer-surface side of the molded foam (3). In the molded object (1) and molded foam (3), the contact angle between the surface and water is smaller than 70°. That contact angle is smaller than in a molded object or molded foam formed from the thermoplastic resin composition not containing the substance (2).

Description

Specification

Molded product or foamed molded product containing water-swellable substance, production method thereof, and use method thereof

Technical field

TECHNICAL FIELD [0001] The present invention relates to a molded article or foamed molded article containing a water-swellable substance, a method for producing the same, and a method for using them, and in particular, a polyolefin resin or a polyvinyl compound resin that is a hydrophobic material. , Molded articles or foamed molded articles having a small contact angle with water and good water wettability, which are obtained by adding a water-absorbing swellable substance to polystyrene rosin at the raw material stage, and Further, the present invention relates to a method for producing the molded body or the foamed molded body, and a method for using the molded body or the foamed molded body.

Background art

[0002] Thermoplastic resins, in particular, polyolefin resins that are considered to be general-purpose resins! / Polyvinyl compound resins, polystyrene resins, polystyrene resins, etc. are excellent in terms of processability and cost, so they are extremely versatile. Is used. However, the surface of the molded product, especially the molded product made of polyolefin resin, is hydrophobic and has poor water wettability, so it cannot be used for applications such as filtration filters or battery separators, and its usage is limited. It had been. For this reason, various hydrophilization treatment methods for imparting hydrophilicity to a molded body of a polyolefin-based resin have been proposed.

[0003] For example, in Patent Document 1, after coating a hydrophobic polymer polyolefin resin with a polyamide polymer, the surface thereof is further coated with a water-insoluble hydrophilic polymer, whereby heat resistance is improved. An invention of a hydrophilized substrate and a method for producing the same has been proposed. However, the invention proposed in Patent Document 1 has a problem that a small amount of the solvent used for coating remains on the hydrophilic treatment substrate.

[0004] Patent Document 2 proposes an invention for a hydrophilic polyolefin nonwoven fabric useful for battery separators, wipers, diaper top sheets, etc., which has a uniform texture and is excellent in hydrophilicity and chemical resistance. ing. Specifically, a polyolefin containing a predetermined amount of a hydrophilizing agent having a constant composition. The power that is the invention of a nonwoven fabric in which fins occupy at least 40% of the fiber surface and the polyolefin fibers are partially thermally bonded to each other. It was.

[0005] Furthermore, in Patent Document 3, a porous material that can be widely used in the fields of electronic devices such as battery separators and insulators, water treatment fields such as bacteria and virus filtration, gas separation fields, and air conditioning fields. A hydrophilic polyolefin porous film obtained by immersing a porous film made of polypropylene and Z or polyethylene in a hydrophilic treatment liquid containing a specific surfactant as a film, and an invention of its production method have been proposed. However, in the invention of Patent Document 3, there is a problem that the hydrophilic treatment liquid also elutes the porous film force.

[0006] Further, Patent Document 4 proposes an invention related to hydrophilic polyolefin-based porous fibers that have been subjected to a hydrophilic treatment by plasma irradiation. However, the hydrophilization treatment by plasma irradiation has a problem that it is not suitable for the hydrophilization treatment of large materials.

Patent Document 1: Japanese Patent Application Laid-Open No. 2004-332123

Patent Document 2: Japanese Patent Laid-Open No. 10-325060

Patent Document 3: Japanese Patent Laid-Open No. 8-20663

Patent Document 4: Japanese Patent Laid-Open No. 7-54267

Disclosure of the invention

Problems to be solved by the invention

[0008] In view of the fact that it is difficult to say that the conventional polyolefin resin hydrophilization treatment method and the molded body obtained by the conventional method have been sufficiently hydrophilized, the present invention has been proposed. Molded article or foam molded article made of a thermoplastic resin composition containing a new water-absorbing swellable substance having a small water contact angle and good water wettability, a method for producing the same, and use thereof The problem is to provide a method.

Means for solving the problem

[0009] The structure of the molded article or foamed molded article of the present invention, which has been made for the purpose of solving the above-mentioned problems, is a molded article or foamed material made from a thermoplastic resin composition containing a water-absorbing swellable substance. In the molded body, the substance is at least on the outer surface side of the molded body or foamed. By being present at least on the inner surface side or the inner surface side and the outer surface side of the molded body, the contact angle with water on the surface of the molded body or the foamed molded body is less than 70 °, and the contact angle is It is characterized by being reduced as compared with a molded product or a foamed molded product made from a thermoplastic resin composition that does not contain the above-mentioned substances!

[0010] In the present invention, the water-absorbing swellable material preferably has a particle size that is substantially the same as or larger than the thickness of the molded body or the thickness of the skeleton inside the foamed molded body. In this case, the contact angle with water can be further reduced. In addition, as the thermoplastic resin, a polyolefin resin, a polybule compound resin, a polystyrene resin, or the like can be used.

[0011] In addition, the shape of the molded body or foamed molded body is desired to be any of a film shape, a sheet shape, a plate shape, a fiber shape, a strand shape, a tube shape, a rod shape, a block shape, a pellet shape, and the like. Good.

[0012] Furthermore, the structure of the method for producing a molded article or foamed molded article of the present invention aimed at solving the above problems is based on a thermoplastic resin composition containing a water-swellable substance. By changing the shape of the exit tip of the extrusion molding machine, it can be molded or foamed in any shape such as film, sheet, plate, fiber, strand, tube, rod, block, pellet A molded article is produced.

[0013] The present invention provides a process of supplying a kneading material to an extrusion molding machine using, as a raw material, a thermoplastic resin composition containing a water-absorbing swellable material mixed with a foaming agent in the above-described production method. The foamed molded body may be manufactured by heating to a temperature at which the foaming agent is decomposed and gas is generated.

[0014] Furthermore, another configuration of the method for producing a molded article or foamed molded article of the present invention aimed at solving the above-mentioned problems is to use a thermoplastic resin composition containing a water-absorbing swellable material as a raw material. The molded article or foamed molded article is formed into a non-woven fabric by entanglement of fibers of a fibrous molded article or foam molded article produced as described above, or by bonding or heat-sealing the fibers with a binder. It is characterized by making it a product.

[0015] Further, the configuration of the method of using the molded article or foam molded article of the present invention, which has been made for the purpose of solving the above-mentioned problems, is made from a thermoplastic resin composition containing a water-swellable substance as a raw material. In the consumer products field such as diapers, bedding, clothes, footwear, etc., or in industries such as water absorption, separation, washing, and wastewater treatment in the manufacturing, food, and pharmaceutical industries It is characterized by being used in the equipment field.

[0016] Furthermore, another configuration of the method of using the molded article or foamed molded article of the present invention for the purpose of solving the above-mentioned problems is that a thermoplastic resin composition containing a water-absorbing swellable substance is used as a raw material. The molded article or foam molded article is used as a battery separator, a filter for filtration, or the like.

The invention's effect

[0017] Since the molded article or foamed molded article of the present invention contains a water-absorbing swellable substance in a thermoplastic resin composition and is subjected to a hydrophilic treatment at the raw material stage, it is conventional polyolefin-based resin. Compared with a hydrophilization treatment such as coating the surface with a water-insoluble hydrophilic polymer, it is possible to ensure hydrophilicity and maintain the hydrophilization performance stably for a long period of time. As a result, it is possible to obtain a special effect that the use of polyolefin resin, which is excellent in chemical resistance, workability, cost, and the like, can be dramatically expanded.

[0018] In addition, the molded product or foamed molded product of the present invention can be formed into a film, sheet, plate, fiber, strand, tube, rod, block, pellet, or the like. Therefore, it can be used in various fields depending on the application. For example, it can be used for battery separators and various filters, for example, a filter for sewage treatment and a filter for blood filtration, which have conventionally been considered to be unable to use a polyolefin-based resin, which is a hydrophobic material. It can also be used as a wastewater treatment carrier.

BEST MODE FOR CARRYING OUT THE INVENTION

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an enlarged cross-sectional view of an essential part of an example of a molded article of the present invention using a thermoplastic resin composition containing a water-swelling substance as a raw material, and FIG. 2 is a thermoplastic resin containing a water-swelling substance. It is a principal part expanded sectional view of an example of the foaming molding of this invention which uses a composition as a raw material.

In FIG. 1, 1 is a molded body formed into a sheet shape, 2 is a water-swellable substance, and in the present invention, a large amount of this water-swellable substance 2 is present on the outer surface side of the molded body 1. The The particle size of the water-absorbable swellable material 2 may be the same force as the thickness of the molded body 1 or larger than the thickness of the molded body 1. Yes.

FIG. 2 shows a case where the present invention is applied to the foam molded article 3. In the case of the foam molded body 3, the water-absorbing swellable substance 2 is present on at least the inner surface side of the foam molded body 3, but may be present on the inner surface side and the outer surface side as shown in FIG. Here, the internal surface refers to the surface of the skeleton part inside the foamed molded product described below. R is a rib constituting the skeleton inside the foamed molded article 3, and W is a wall also constituting the skeleton. This wall W appears as a concave surface in FIG. In the case of the foamed molded article 3, the water-absorbing and expelling substance 2 is present here in the rib R and the wall W of the inner skeleton, so that it has a comparatively small diameter, but larger than these. Even the diameter! /.

Next, embodiments of the present invention will be described. The molded article or foamed molded article of the present invention uses a thermoplastic resin composition containing a water-swellable substance as a raw material, and uses a thermoplastic resin composition not containing such a water-swellable substance as a raw material. The contact angle with water on the surface of the molded article or foam molded article can be significantly reduced. The thermoplastic resin in the present invention can be applied to SBR resin, ABS resin, and the like, in addition to the power of polyolefin resin, polyvinyl compound resin, polystyrene resin, and the like. Examples of polyolefin-based resin include polyethylene, polypropylene, polybutene, and polypentene. In addition, examples of the polyvinyl alcohol compound resin include poly vinyl chloride, ethylene vinyl acetate copolymer and the like.

In the present invention, in order to further improve the hydrophilicity of the molded body 1 or the foamed molded body 3, the water-absorbing swellable substance 2 is at least on the surface side of the molded body 1 or on the skeleton of the foamed molded body 3. It exists on the surface side of a certain rib R or wall W (see Fig. 1 and Fig. 2). This is because water droplets dropped on the surface of the molded article or foamed molded article can easily come into contact with the water-absorbing swellable substance. Further, for the same reason, the particle diameter of the water-absorbing swellable substance 2 to be used should be approximately the same as or larger than the thickness of the molded body 1 or the thickness of the skeleton (rib R and wall W) of the foamed molded body 3. Good.

[0023] In the present invention, the contact angle of the surface of the molded body or foamed molded body with water is set to be smaller than 70 °. This is because those above 70 ° are hydrophobic and cannot be used for filters. [0024] Next, in the present invention, the water-absorbing swellable substance to be contained in the thermoplastic resin composition includes a crosslinked polybulal alcohol such as a butyl alcohol / acrylic acid copolymer, a polyacrylic acid sodium compound, a polyethylene oxide. Examples include cross-linked products, carboxymethyl cellulose (CMC), and hydrophilic polyurethane resin. In particular, Biocontact N (BCN [registered trademark No. 4354506] Nisshinbo Co., Ltd.) is preferred as the hydrophilic polyurethane resin. The water-swellable substance swells several times to several tens of times by water absorption.

[0025] Furthermore, it is preferable that an inorganic powder is contained in the thermoplastic resin composition. By containing the inorganic powder, the contact angle with water on the surface of the molded body or foamed molded body can be further reduced. As the inorganic powder, barium sulfate, calcium carbonate, zeolite, titanium oxide, potassium titanate, sodium hydroxide hydroxide and the like may be used, and these may be used in combination of two or more.

[0026] The form of the molded body or foamed molded body of the present invention may be a film-like, sheet-like, plate-like, fiber-like, strand-like, tube-like, rod-like, block-like, pellet-like, etc., or a cylindrical, noisy shape. Can be. These molded products or foamed molded products can be produced by using a thermoplastic resin composition containing a water-absorbing swellable material as a raw material and changing the shape of the outlet tip of the extruder. For molding, a molding method other than extrusion molding can be used. Examples include injection molding, compression molding, blow molding, transfer molding (transfer molding), blow molding (hollow molding), and vacuum molding.

[0027] The above-mentioned sheet form means a sheet that is thicker than a film but more flexible than a plate. This sheet-like molded product or foam-molded product includes a knitted or woven yarn or fiber, a non-woven fabric, or a sheet without a single hole.

[0028] When the thermoplastic resin and the water-absorbing swellable substance or the thermoplastic resin composition in which the inorganic powder is mixed are kneaded with an extruder, they are kneaded at the melting temperature of the thermoplastic resin. A molded body such as a film, a strand, or a tube can be manufactured by attaching a film forming die, a strand die, a tube die, or the like to the exit tip of the extruder. In addition, when a foaming agent is further mixed into the thermoplastic resin composition, as will be described in detail later, kneading is performed at a temperature at which the foaming agent decomposes or higher.

[0029] Further, in the case of using a kneader for kneading the thermoplastic resin composition, the thermoplastic resin Kneading at the melting temperature of the fat. If a foaming agent is mixed, the foaming agent is kneaded and foamed at a temperature at which the foaming agent decomposes and generates gas.

[0030] The foamed molded product of the present invention is obtained by mixing a foaming agent into a thermoplastic resin composition containing a water-absorbing swellable substance as a raw material, and supplying the foamed product to an extruder and kneading the foamed molded product. It is manufactured by heating to a temperature at which the agent decomposes and generates gas. Examples of foaming agents include sodium bicarbonate (bicarbonate) and azodicarbonamide (ADCA). Examples of foaming agents include chemical foaming agents and physical foaming agents, which are not limited to these. Examples of chemical foaming agents include azo compounds such as norazoazodicarboxylate (Ba / AC), -troso compounds such as Ν, Ν-dinitrosopentamethylenetetramine (DPT), 4,4'- Hydrazine derivatives such as oxybis (benzenesulfurhydrazide) (OBSH), semicarbazide compounds, azide compounds, triazole compounds, isocyanate compounds, bicarbonates such as sodium bicarbonate, carbonates, nitrites, hydrides, heavy compounds Examples thereof include a mixture of sodium carbonate and an acid (for example, sodium bicarbonate and citrate), a mixture of hydrogen peroxide and an enzyme, a mixture of zinc powder and an acid, and the like. Physical foaming agents include, for example, aliphatic hydrocarbons (eg, butane, pentane, hexane, etc.), salty hydrocarbons (eg, dichloroethane, dichloromethane, etc.), fluoride salty carbonization. Examples include hydrogen (for example, triclonal monofluoromethane, dichlorodifluoromethane, dichloromonofluoromethane, dichlorotetrafluoroethane), alternative chlorofluorocarbons, air, carbon dioxide gas, nitrogen gas, and water.

[0031] It should be noted that the foamed molded product of the present invention is not limited to the above production method, but is disclosed in JP-A-5-200891 and the like, and kneaded with a foaming agent. The production method may be a two-step process consisting of a step of producing a fat composition and a step of foaming the resin composition into a mold. In this case, kneading is performed at a temperature at which the foaming agent is not decomposed in the kneading step, and then the foamed molded body is heated to a temperature at which the foaming agent is decomposed and gasified in the mold during the foaming step. Can be manufactured.

[0032] Further, when forming the nonwoven fabric molded product of the present invention, fibers of a fibrous molded body or a foamed molded body manufactured using a polyolefin resin composition containing a water-swellable substance as a raw material are used. The fiber shaped body or the foam molded body is formed into a nonwoven fabric molded article by entanglement of the fibers, or by bonding or heat-sealing the fibers with a binder. [0033] Next, a molded article or foamed molded article made from the thermoplastic rosin composition containing the water-absorbing swellable substance of the present invention is used in the field of consumer goods such as diapers, bedding, clothes and footwear, or It can be used in industrial equipment fields such as water absorption, separation, washing, and wastewater treatment in the manufacturing, food and pharmaceutical industries. For example, when used for diapers, water can be absorbed quickly and water-swelling substances do not flow out, so there is no rash. In addition, when used as a sheet in bedding, for example, sweat can be absorbed effectively.

[0034] The molded article or foamed molded article of the present invention can also be used as a battery separator, a filter for filtration, and the like. When the molded article or foamed molded article of the present invention is used for a battery separator, for example, as a molded article of a non-woven fabric, it has high wettability with an electrolytic solution, and conventional polyolefin resin is hydrophilic with a hydrophilic polymer or the like. Compared with the soaked product, the water-swelling substance is not eluted in the electrolyte solution. In addition, when the molded article or foamed molded article of the present invention is used for a filter of a sewage treatment tank, impure substances can be removed quickly, and rapid sewage treatment becomes possible. Further, the molded article or foamed molded article of the present invention does not elute a water-swellable substance, so that it is highly safe for medical use where eluate is regarded as a problem, such as a filter for blood filtration. It can be suitably used. Furthermore, it can be suitably used in fields where high antifogging properties are required, for example, fields such as agricultural sheets, packaging materials for foods, electrical components, and the like.

Next, an example of a more specific configuration of the present invention will be described by comparing the effect with a comparative example.

Example

[Examples 1 to 8]

The raw materials obtained by blending the constituent materials shown in Examples 1 to 8 in Table 1 below in a dry state (dry blend) are supplied to a single screw extruder or a twin screw extruder, and from the nozzle at the tip of the extruder, The molded product or foamed molded product of the present invention was obtained by extrusion into a strand or film. The set temperature was set to a temperature at which the resin melted, and when a foaming agent was mixed, the foaming agent was decomposed and gas was generated. Specifically, since Example 1 does not contain a foaming agent, it may be set to a melting temperature (110 ° C.) or higher of the resin. Examples 2 to 8 are Since the foam was formed, the temperature was set to a temperature (150 ° C or higher) at which baking soda decomposes and generates gas. In addition, Example 4 was molded without mixing barium sulfate, which is an inorganic powder.

[0037] [Comparative Example 1]

Next, a raw material obtained by blending (driving) the constituent materials shown in Comparative Example 1 in Table 1 below in a dry state is set at a temperature (110 ° C or higher) at which the low density polyethylene (LDPE) resin melts. In the same manner as in Examples 1 to 8, it was supplied to a single screw extruder or a twin screw extruder and extruded into a strand shape or a film shape from a nozzle at the end of the extruder, and the molded product of Comparative Example 1 Got.

[0038] For the molded bodies or foam molded bodies of Examples 1 to 8 above and the molded body of Comparative Example 1, the contact angle was measured by droplets in accordance with JIS Z-3198-4. Specifically, 1 μ 1 droplets (tap water) were dropped on the surfaces of the molded articles or foam molded articles of Examples 1 to 8 and Comparative Example 1 to be measured. The measurement results are shown in the right column of Table 1 below.

The performance of each molded body or foamed molded body can be evaluated by the size of the contact angle with water. The larger the contact angle, the higher the hydrophobicity and the smaller the smaller the higher the hydrophilicity. Do not mix water-swellable substances in the raw material! / ヽ Compared to the molded body of Comparative Example 1, the molded body of Examples 1 to 8 or the foamed molded body clearly mixed has a smaller contact angle and higher hydrophilicity. I understand that. In addition, among the molded products or foamed molded products of Examples 1 to 8 mixed with water-swellable materials, those in which both a foaming agent (bicarbonate) and organic powder (barium sulfate) were mixed (Example 2). , 3, 5, 6, 7, 8), in which only one of these is mixed (Examples 1 and 4), the contact angle is smaller and the hydrophilicity is higher. When bio-contact N (BCN [registered trademark No. 4354506] Nisshinbo Co., Ltd.), a hydrophilic polyurethane resin, is used as the material (Example 6), When EVA resin is used as the thermoplastic resin In other words, the contact angle is smaller and the hydrophilicity is higher.

[0039] [Table 1] r (translation «1 (grip) $ <<) 1 ^ i 聽 ss M * G 3d3

瀣 ί S 卜 01 mmmm

Rare. Rare § OS

趨 r rare s 抓 * 5f size

Rare

餐 g¾A3oo ΈV

餐. S li§dOI

«« (遨) ¾ 娴 ϊ λ λgπ * ί .: S

(Examples 9 to 13)

Next, molded foams of Examples 9 to 13 of the present invention were obtained using raw materials obtained by blending (driving) the constituent materials shown in Examples 9 to 13 in Table 2 below in a dry state. Specifically, the components shown in Table 2 are kneaded at a temperature (120 to 150 ° C.) at which the polyolefin resin melts and the blowing agent is not decomposed and gasified by a heating method- The product obtained in the kneading process is formed into a sheet of about 1 cm thickness and left in the mold, and is heated at a temperature (170 ° C or higher) at which the foaming agent decomposes and gasifies. The foam molded articles of Examples 9 to 13 were obtained.

[Comparative Example 2]

The constituent materials shown in Comparative Example 2 shown in Table 2 below were produced in the same manner as in Examples 9 to 13, and a foamed molded article of Comparative Example 2 was obtained.

[0042] The foam molded articles of Examples 9 to 13 and the foam molded article of Comparative Example 2 were evaluated for water absorption performance. The evaluation was performed by placing a 10 mm square foamed molded object gently on the surface of static tap water and measuring the time that the entire measured object was immersed in water. It can be evaluated that hydrophilicity is so high that this time is short. The evaluation results are shown in the right column of Table 2, but the foamed molded products of Examples 9 to 13 containing a water-absorbing swellable substance were clearly compared with the foamed molded product of Comparative Example 2, and clearly It can be seen that the submergence time is short and the hydrophilicity is high.

[0043] [Table 2]

Industrial applicability

The present invention is a polyolefin-based resin, a polyolefin which is excellent in terms of processability and cost. Conventionally, it has been considered difficult because a molded article or foamed molded article of a thermoplastic resin composition such as a bull compound resin or polystyrene resin is subjected to a hydrophilic treatment by containing a water-absorbing swellable substance in the raw material stage. Since it can be used suitably for battery separators and filter filters, the application can be expanded dramatically in the future.

[0045] FIG. 1 is an enlarged cross-sectional view of a main part of an example of a molded article of the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part of an example of a foamed molded product of the present invention.

Explanation of symbols

[0046] 1 Molded body

2 Water-absorbing swellable substance

3 Foam molding

R Skeleton rib

W skeleton wall

Claims

The scope of the claims

[1] In a molded article or foamed molded article made from a thermoplastic resin composition containing a water-absorbing swellable substance, the substance is at least on the outer surface side of the molded article, or at least the inner surface of the foamed molded article The contact angle with water on the surface of the molded body or foamed molded body is less than 70 °, and the contact angle should not contain the substance! / A molded body or foam molded body containing a water-absorbing swellable material, which is reduced in comparison with a molded body or foamed molded body made from a thermoplastic resin composition.

[2] The molded article or foamed molded article according to claim 1, wherein the water-absorbing swellable substance has a particle size substantially equal to or greater than the thickness of the molded article or the thickness of the skeleton within the foamed molded article.

[3] The molded product or foamed molded product according to claim 2, wherein the thermoplastic resin is selected from polyolefin resin, polyvinyl-polyamide resin, and polystyrene resin.

[4] The composition according to claim 1, wherein the molded body or the foamed molded body is in the form of a film, a sheet, a plate, a fiber, a strand, a tube, a rod, a block, or a pellet. Shape or foam molded body.

[5] The composition according to claim 2, wherein the molded body or the foamed molded body is in the form of a film, a sheet, a plate, a fiber, a strand, a tube, a rod, a block, or a pellet. Shape or foam molded body.

[6] The composition according to claim 3, wherein the molded body or the foamed molded body is in the form of a film, a sheet, a plate, a fiber, a strand, a tube, a rod, a block, or a pellet. Shape or foam molded body.

[7] Using a thermoplastic resin composition containing a water-absorbing swellable material as the raw material, and changing the shape of the exit tip of the extruder, it is a film, sheet, plate, fiber, strand, A method for producing a molded article or foamed molded article containing a water-absorbing swellable substance, which comprises producing a molded article or foamed molded article having a tube shape, rod shape, block shape, or pellet shape.

[8] A foamed material mixed with a thermoplastic resin composition containing a water-swellable substance is used as a raw material, and the foamed agent is decomposed and gas is generated in the course of feeding to an extruder and kneading. 8. The method for producing a foam molded article according to claim 7, wherein the foam molded article is produced by heating to a temperature.

[9] Fibers of a molded product or a foamed product produced using a thermoplastic resin composition containing a water-absorbing swellable material as raw materials are entangled with each other, or the fibers are bonded with a binder, or 8. The method for producing a molded product or a foamed molded product according to claim 7, wherein the molded product or the foamed molded product is formed into a nonwoven fabric molded product by heat sealing.

[10] Molded products or foamed molded products made from thermoplastic resin composition containing water-absorbing swellable material are used in the field of consumer goods such as diapers, bedding, clothes, footwear, or in manufacturing and food industries. A method of using a molded article or foamed molded article containing a water-absorbing swellable substance, characterized in that it is used in the field of industrial equipment such as water absorption, separation, washing, and wastewater treatment in the pharmaceutical industry.

[11] A molded article or foamed molded article made of a thermoplastic resin composition containing a water-absorbing swellable material as a raw material is added with a water-absorbing swellable substance used as a battery separator or a filter for filtration. Method of using a molded product or foamed molded product.