JP2008050592A - Resin particle with powder united thereto and method for granulating the same, particle-containing molded article, particle-containing sheet material, and method of forming these - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve problems such as a problem that it has been difficult to uniformly mix a resin with powder due to difference between the specific gravity of the resin and the specific gravity of the powder, when the resin and the powder are mixed each other and then formed into films or molded into a molded article, and a problem that it has also been difficult to uniformly mix a resin with powder, when the resin and a material having different specific gravity are generally united with a kneader to produce a master match. <P>SOLUTION: The present invention provides a method for simply uniting a thermoplastic resin with a functional material. The uniting process can be performed without needing a resin-curing or liquidizing process and can process the resin in a powdery shape to a small stone-like suitable shape which can easily be used for post processes using twin-screw extruders. A method for producing the particles is characterized by uniting a functional material with a thermoplastic resin whose surface is at least softened or melted, to produce the united particles. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

  The present invention relates to a powder-integrated resin particle and a granulating method thereof, a particle-containing molded body, a particle-containing sheet material, and a molding method thereof, and in particular, a thermoplastic resin and a powder, preferably a functional material (pigment). From the powder-integrated resin particles, the granulating method of the powder-integrated resin particles, the particle-containing molded body comprising the powder-integrated resin particles, and the powder-integrated resin particles The present invention relates to a molded particle-containing sheet material and these molding methods.

  In order to exhibit a specific function of a powder, preferably a functional material, compositions having various resins and powders are widely known. As a method for producing such a composition, a method of mixing a certain amount of resin and powder to form a film and molding, a method of uniformly kneading and supporting these components, Although a method of molding in a mixed manner is mentioned, it is not satisfactory for exhibiting the function of the powder, and hence the functional material.

  For example, in the case of film formation / molding by mixing a resin and a powder, it is difficult to mix the resin and the powder uniformly due to the difference in specific gravity between the resin and the powder. Moreover, when trying to integrate materials having different specific gravities from the resin, a master batch is generally produced by a kneader, but in this case as well, it was difficult to mix the two uniformly. .

  An example of a method for uniformly kneading and supporting a functional material made of an organic or inorganic substance such as zeolite in a resin is a method using a twin screw extrusion pelletizer. In this case, it is sufficient if the particle size at the time of charging is close and the specific gravity is close to each other, but if the particle size, specific gravity, and friction coefficient are different, the ratio at the time of charging and entering the extruder shaft is different, The thing of the uniform ratio was not made.

  As a method for preventing this, it is necessary to make the hopper charging part into two systems. For example, when the raw material is charged into the twin-screw extruder, there is a method of separately and directly charging it by vibration such as ultrasonic waves. Although it is mentioned, problems such as a change in the mixing ratio at the time of charging occur due to a fine difference in specific gravity existing in each of the separated raw materials. In this case, it is conceivable that the hopper portion has two systems, but in this method, the ratio of the resin and the functional material is limited.

  Furthermore, when these are melted by heat and a twin screw extrusion process is used, pelletizing a functional material without thermoplasticity with a screw in a high concentration state may cause a great load on the screw and damage the motor. Therefore, there is a problem that only functional materials in a ratio that the motor allows can be used.

Currently, Patent Document 1 and Patent Document 2 disclose a method of forming a mixture of resin and powder. Since these all use a thermosetting resin as the resin part, the steps of curing and liquefaction are indispensable. In addition, since there is little fluidity and extensibility due to heat, it is difficult to carry a high concentration of powder in the mixing step, and there is a possibility that the performance of the functional material in the molded body may be reduced. Furthermore, when a thermoplastic resin and powder are mixed and processed with a mixer such as a Henschel mixer, cross-linking occurs between molecules due to frictional heat with the rotating blades and the wall of the granulation tank, so that curing occurs in the granulation tank. It may occur and the integration process may be difficult. In addition, since thermosetting resins are molded using a curing reaction by heating, the molding method is limited, and post-processes such as biaxial stretching of the molded body are difficult.
JP-A-11-246672 Japanese Patent Application Laid-Open No. 09-067155

  The present invention has been made in view of the above-described problems, and provides powder-integrated resin particles produced by a simple method while exhibiting the function of a powder, preferably a functional material (including a pigment). The purpose is to provide. In addition, the present invention makes it easy to perform integrated processing without the need for resin curing and liquefaction processing, and post-processing such as film forming by biaxial extrusion, etc. without degrading the properties of the functional material. It aims at providing the granulation method of the powder integrated resin particle to obtain. Another object of the present invention is to provide a particle-containing molded body composed of such powder-integrated resin particles, a particle-containing sheet material molded from the powder-integrated resin particles, and a molding method thereof. And

  The powder-integrated resin particles according to the present invention have a granular carrier made of a thermoplastic resin and a powder integrated on the surface of the granular carrier. Thereby, it becomes possible to fully exhibit the characteristics of the powder.

  In the powder integrated resin particle according to the present invention, the average particle diameter of the powder integrated resin particle is 10 μm or more. Thereby, handling of the powder-integrated resin particles is advantageous, for example, the particles do not scatter in the post-treatment.

  In the powder integrated resin particle according to the present invention, the weight of the powder is 50 wt% or more and 900 wt% or less with respect to the weight of the thermoplastic resin. Thereby, it becomes possible to fully exhibit the characteristics of the powder.

  In the powder integrated resin particle according to the present invention, a volume ratio of the thermoplastic resin to the powder is 1: 1 to 1:20. Thereby, it becomes possible to fully exhibit the characteristics of the powder.

  The particle-containing molded product according to the present invention is characterized by comprising the above-mentioned powder-integrated resin particles and a water-soluble organic resin. As a result, a particle-containing molded body having higher strength while exhibiting the characteristics of the powder can be obtained.

  In the particle-containing molded product according to the present invention, the content of the water-soluble organic resin is 2 to 50% by weight with respect to the weight of the powder-integrated resin particles. Thereby, the particle | grain containing molded object which was further excellent in intensity | strength is obtained.

  The method for granulating powder-integrated resin particles according to the present invention comprises granulating a granular carrier comprising a thermoplastic resin, and powder-integrated resin particles having a powder integrated on the surface of the granular carrier. A method of applying heat to the granular carrier so that the surface of the granular carrier is at least softened; and attaching a powder to the surface of the softened granular carrier. It is characterized by having. Thereby, it becomes possible to obtain powder-integrated resin particles that can sufficiently exhibit the characteristics of the powder.

  In the method for granulating powder-integrated resin particles according to the present invention, the step of applying heat to the granular carrier includes frictional heat generated by contact between a rotating member that rotates in a sealed space and the granular carrier. It is the process performed by these. This makes it possible to supply heat to the granular carrier by using the frictional heat generated during one step of the granulation method without the need for further equipment, thereby reducing the complexity of the step. It becomes possible.

  The molding method of the particle-containing molded article according to the present invention is characterized by having a step of adding a water-soluble organic resin to the powder-integrated resin particles, kneading, and pressurizing. Thereby, it becomes possible to further improve the degree of integration of the powder-integrated resin particles.

  The particle-containing sheet material according to the present invention is characterized by comprising powder-integrated resin particles having a granular carrier made of a thermoplastic resin and a powder integrated on the surface of the granular carrier. Thereby, even if the content of the powder is high, the handling becomes easy while fully exhibiting the characteristics of the powder.

  In the particle-containing sheet material according to the present invention, the film thickness of the particle-containing sheet material is 10 μm or more and 5 mm or less. Thereby, the handling as a sheet | seat becomes favorable.

  In the particle-containing sheet material according to the present invention, the particle-containing sheet material further includes a second resin. As a result, problems such as plasticity and brittleness are eliminated, and a particle-containing sheet material having a desired form can be obtained.

  In the particle-containing sheet material according to the present invention, the second resin is a thermoplastic resin. Thereby, the integrity as a sheet improves.

  The method for forming a particle-containing sheet material according to the present invention comprises a particle-containing sheet material comprising powder-integrated resin particles having a granular carrier made of a thermoplastic resin and powder integrated on the surface of the granular carrier. A method of applying heat to the granular carrier so that the surface of the granular carrier is at least softened; and attaching a powder to the surface of the softened granular carrier; A step of obtaining powder-integrated resin particles; and a step of forming a composition comprising the powder-integrated resin particles so as to have a sheet shape. This makes it possible to obtain a sheet-like product while fully exhibiting the characteristics of the powder.

  In the method for molding a particle-containing sheet material according to the present invention, the step of molding the composition comprising the powder-integrated resin particles is a step of performing extrusion molding by adding a second resin. To do. Thereby, it becomes possible to obtain the particle-containing sheet material of a desired form.

  In the method for forming a particle-containing sheet material according to the present invention, the second resin is a thermoplastic resin. This makes it possible to adjust the heat seal temperature.

  The “particle” of the powder integrated resin particle in the present invention refers to a molded product obtained by the granulation method of the powder integrated resin particle according to the present invention.

  According to the present invention, it is possible to sufficiently exhibit the characteristics of the powder, particularly the performance of the functional material.

  According to the present invention, the powder can be handled in an arbitrary shape.

  According to the present invention, such powder-integrated resin particles can be easily obtained without performing treatments such as curing and liquefaction treatment.

  According to the present invention, known post-processing such as extrusion processing and master batch processing can be easily performed at low cost.

  Hereinafter, the present invention will be described in more detail.

(Powder integrated resin particles according to the present invention)
The powder-integrated resin particle according to the present invention has a granular carrier made of a thermoplastic resin and a powder integrated on the surface of the granular carrier, and has a particulate form. is there. The form of the powder integrated resin particle according to the present invention is not particularly limited as long as it is particulate. For example, the form of the powder-integrated resin particles is not particularly limited. As shown in FIG. 1, the powder 4 is integrated on the surface of the granular carrier 2 around the granular carrier 2. Form may be sufficient.

  In the powder-integrated resin particle according to the present invention, the state of “integrated on the surface of the granular carrier” means that the thermoplastic resin and the powder constituting the granular carrier can make the thermoplastic resin into a solid state. A state of continuous bonding at temperature. As such a state, after the heat is applied to the thermoplastic resin constituting the granular carrier to change from the solid state to at least the molten state, the powder adheres to the surface of the molten thermoplastic resin. The state formed when the composition is set to a temperature at which the thermoplastic resin is in a solid state.

  In the powder integrated resin particles according to the present invention, as the thermoplastic resin, polyethylene (PE), low density polyethylene (LDPE), high density polyethylene (HDPE), chain low density polyethylene (LLDPE), polypropylene (PP), Ethylene vinyl acetate (EVA), ethylene-methacrylic acid copolymer (EMAA), ethylene-methyl methacrylic acid copolymer (EMMA), ethylene-methyl acrylic acid copolymer (EMA), vinyl chloride, vinyl acetate, vinyl chloride Examples include vinyl acetate copolymer, acrylic, methacrylic resin, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and polyacrylonitrile (PAN). The thermoplastic resin may be an appropriate combination of these materials. Good. Among these, PE, LDPE, LLDPE, PP, EVA, EMAA, EMMA, EMA, and acrylic resin are desirable for integration with the functional material. These thermoplastic resins are desirably those having a softening property at 200 ° C. or lower. By using the thermoplastic resin of these materials, fluidity and extensibility are imparted to the resin part, the dispersibility between the resin part and the powder, preferably the functional material, is increased, and the granular support made of the thermoplastic resin is further provided. It becomes possible to carry the functional material at a high concentration on the body.

  In the powder-integrated resin particles according to the present invention, the granular carrier made of the thermoplastic resin is not particularly limited as long as it can form a granular shape, and examples thereof include pellets, granules, and pebbles. Is done.

  In the powder integrated resin particles according to the present invention, the powder may be either an inorganic substance or an organic substance as long as it can maintain a solid state when integrated with the following thermoplastic resin. . Among them, in the present invention, the functional material used as the powder is not particularly limited as long as it is an inorganic or organic substance having a function desired to be imparted to the powder-integrated resin particles. It may be a mixture. Here, examples of the function desired to be given include odor absorption, hygroscopicity, hydrophobicity, heat resistance, color development, hydrophilicity, adsorptivity, and impact resistance.

  In the powder-integrated resin particles according to the present invention, the functional material that is an inorganic substance is silica, colloidal silica, zeolite, montmorillonite, hectorite, talc, aerosil, mica, bentonite, aluminum compound, magnesium compound, barium compound, Known inorganic functional materials such as calcium carbonate, alumina, silicon nitride, boron nitride, natural mineral pigments such as iron oxide (valve), mercury sulfide (silica sand), amber, senna, kaolin, white mica, cadmium yellow, Synthetic inorganic pigments such as nickel titanium, viridian, ultramarine, carbon black, and lead white can also be used.

  In addition, examples of the functional material that is an organic substance include powdered ink toners used in copying machines and laser printers, phosphors, synthetic organic pigments such as phthalocyanine-based, azo-based, and polycyclic compounds, and natural organic pigments such as lakes. And thermosetting resins such as synthetic dyes, polyimides, urea resins, phenol resins, epoxy resins, urethane resins, melamine resins, unsaturated polyester resins, and alkyd resins.

  In the powder-integrated resin particles according to the present invention, the functional material used as the powder may be treated with a surface modifier such as a coupling agent so as to appropriately modify the characteristics. Examples of such surface modifiers include methylating agents and silylating agents. For example, when zeolite is used as the powder and methylated, it is possible to impart hydrophobicity to the powder-integrated resin particles.

  In the powder integrated resin particles according to the present invention, the average particle size of the powder is usually 0.1 to 500 μm, particularly 1 to 100 μm. In addition, what is necessary is just to use well-known measuring methods, such as a wet method, for the measurement of this average particle diameter.

  The particle size of the powder integrated resin particles according to the present invention is 0.5 to 70 mm, particularly 1 to 40 mm, and the average particle size of the powder integrated resin particles according to the present invention is 10 μm or more. Particularly preferred is 1 to 30 mm. When the average particle size is less than 10 μm, the entire amount cannot be automatically discharged when taken out from a sealed space where granulation is performed such as a granulation tank. Moreover, when an average particle diameter exceeds 40 mm, it becomes impossible to respond | correspond to screws, such as a twin-screw extruder used for a post process, and a film-forming machine.

  Further, among the powder integrated resin particles according to the present invention, those having an average particle diameter of 1 to 30 mm may be used as they are for a desired use, and can be suitably used particularly for extrusion. It can also be used effectively for film formation.

  In the powder integrated resin particles according to the present invention, the weight of the powder is not particularly limited, but is preferably 50 to 900% by weight, for example, 80 to 100% by weight with respect to the weight of the thermoplastic resin. It is more preferable that If it is less than 50% by weight, the thermoplastic resin, which will be described later, is melted, and the surface of the powder-integrated resin particles becomes bullet marks, or the adhesion of the surface increases. You may not be able to remove it from the space where you do it. On the other hand, if it exceeds 900% by weight, the integration of the thermoplastic resin and the powder may not proceed and granulation may not be possible.

  In the powder-integrated resin particles according to the present invention, the volume ratio of the thermoplastic resin and the inorganic or organic functional material powder is preferably 1: 1 to 1:20. Outside these ranges, it may not be possible to remove from a space for granulation such as a granulation tank during production.

(Particle-containing molded product according to the present invention and molding method thereof)
The particle-containing molded article according to the present invention is a particle-containing molded article composed of the above-described powder-integrated resin particles according to the present invention and a water-soluble organic resin such as polyvinyl alcohol (PVA). It does not specifically limit as a form of this particle | grain containing molded object, For example, a cylinder, a pyramid etc. are illustrated.

  In the particle-containing molded product according to the present invention, examples of the water-soluble organic resin include polyvinyl alcohol (PVA), acrylic acid, and polyester. The solid content of the water-soluble organic resin is preferably 1% to 25%. In the powder integrated resin particle according to the present invention, the weight of the water-soluble organic resin is preferably 10% by weight or more and 50% by weight or less with respect to the weight of the powder integrated resin particle. If it is less than 10% by weight, the adhesive strength is not sufficient, and if it exceeds 50% by weight, the characteristics of the powder, particularly the function of the functional material, is deteriorated.

As a molding method of the particle-containing molded body according to the present invention, the powder integrated resin particles and the water-soluble organic resin are formed into a molded body having a certain shape by using a molding method known in this technical field. If it is, there will be no restriction | limiting in particular, What knead | mixed, baking, a heating, pressurization etc. individually or in combination is mentioned. The heating temperature is not particularly limited as long as it is a temperature at which a solvent used for molding can be volatilized. As the range of the pressure of the pressure, 1 kg / cm ² or more can be mentioned.

(Granulation method of powder-integrated resin particles according to the present invention)
The method for granulating powder-integrated resin particles according to the present invention includes a step of applying heat to the granular carrier so as to at least soften the surface of the granular carrier made of the thermoplastic resin, and then the softening. A step of attaching the above-mentioned powder, preferably a functional material, to the surface of the granular carrier. As a result, the powder-integrated resin particles having a granular carrier made of a thermoplastic resin and a powder integrated on the surface of the granular carrier are obtained.

  In the granulation method for powder-integrated resin particles according to the present invention, the granular carrier used for granulation of the powder-integrated resin particles, and the powder exemplified by the functional material, During the granulation system, it may be introduced as appropriate. When performing the step of applying heat to the granular carrier, the powder exemplified by the functional material has already been introduced into the system. Alternatively, after performing this step, a step of introducing the powder into the system and attaching the powder to the surface of the granular carrier may be performed. Among them, the thermoplastic resin is first introduced for the purpose of suppressing the scattering of the powder exemplified as the functional material in the system for granulating and promoting the softening of the thermoplastic resin. It is preferable. The method for introducing these components into the system for granulation is not particularly limited, and a method of introducing a hopper for introduction at the top of the system for granulation to introduce into the system from the hopper, The method is appropriately selected from a method of directly entering the system manually. Further, the form of the granular carrier made of the above powder and thermoplastic resin introduced into the sealed space for granulation may be appropriately selected according to the desired form of the powder integrated resin particle. For example, examples of the form of the granular carrier made of a thermoplastic resin include pellets, granules, and pebbles.

  In the method for granulating powder-integrated resin particles according to the present invention, the method for applying heat to the granular carrier is as long as the surface of the granular carrier made of thermoplastic resin is at least softened. There are no particular restrictions. For example, a method of directly applying heat to the thermoplastic resin constituting the granular carrier may be used. In this case, for example, a method of introducing a granular carrier made of a thermoplastic resin into the sealed space and raising the temperature of the sealed space may be used. Also, it is introduced into a mixing granulator such as a Henschel mixer, and a rotating member such as a rotary blade that rotates in the sealed space of this machine is brought into contact with the granular carrier, and the granular carrier is caused by the frictional heat generated at this time. Heat may be applied to the body.

  In the granulation method of the powder-integrated resin particles according to the present invention, the temperature of the step of applying heat to the granular carrier includes the thermoplastic resin used for granulation and the physical properties of the powder, glass transition point, melting temperature, etc. Depending on the situation, it may be selected appropriately. For example, when heat is applied to a granular carrier made of polyethylene, polypropylene or the like as a thermoplastic resin, the temperature may be 80 ° C to 200 ° C. If it is lower than 80 ° C., it becomes difficult to at least soften the granular support made of the thermoplastic resin, and integration with the powder to be performed later does not proceed. On the other hand, when the temperature exceeds 200 ° C., the viscosity of the granular carrier is too low, and in the step of attaching the powder after the step of applying heat to the granular carrier, friction with the powder hardly occurs and it is difficult to contact. End up. Therefore, it becomes difficult to integrate the powder and the thermoplastic resin, and the particle size of the composition obtained by the process of adhering the powder increases, and various subsequent processes performed after this process. You may not be able to bring it in In addition to the above, the thermoplastic resin used in this temperature range includes polyethylene terephthalate, polycarbonate, and acrylic resin.

  In the granulation method for powder-integrated resin particles according to the present invention, the temperature of the step of applying heat to the granular carrier may be lower than the melting point of the powder. Thereby, when heat is applied to the granular carrier, it is possible to prevent melting and integration with the thermoplastic resin.

  In the method for granulating powder-integrated resin particles according to the present invention, the step of applying heat to the granular carrier comprises mixing and granulating a thermoplastic resin and preferably a powder exemplified by a functional material. Alternatively, a known mixing granulator may be used. As this mixing granulator, the mixing granulator provided with the granulation tank is mentioned, For example, a Henschel mixer is used suitably. The size of the granulation tank provided in such a mixing granulator may be appropriately selected according to the amount of components such as the thermoplastic resin and powder to be introduced, the specific gravity of the powder, etc. ~ 200 cm, height may be 80% to 200% of diameter.

  In the method for granulating powder-integrated resin particles according to the present invention, the step of applying heat to the granular carrier is a contact between a rotating member that rotates in a sealed space for granulation and the granular carrier. May be performed by frictional heat generated by In particular, when performing a step of applying heat to the granular carrier using a Henschel mixer, contact with the granular carrier by a rotating member such as a rotary blade that rotates in the tank provided at the bottom of the granulation tank. May be performed by frictional heat generated by Thus, when granulation is performed using a Henschel mixer, it is preferable that the tip of the rotating member is performed so as to give a shearing force to the granular carrier. Here, the rotational speed of the rotating member may be appropriately selected according to the material of the granular carrier, the glass transition point, the melting temperature, and the like. For example, the rotational speed of the tip of the rotating member is 10 m / second to 100 m / second. You may set so that it may become second, especially 30m / sec-60m / sec. If it is such a range, it is preferable at the point which can raise the probability of contact with the powder illustrated by control of the softening temperature of a thermoplastic resin, and the functional material or functional pigment derived from an inorganic or organic.

  In addition, when performing the step of applying heat to the granular carrier using a Henschel mixer, the granulation tank is heated for the purpose of at least softening the surface of the granular carrier made of thermoplastic resin. Let it be done. In this case, the temperature of the granulation tank may be appropriately selected according to the material of the granular carrier, the glass transition point, the melting temperature, and the like. For example, when polyethylene, polypropylene, or the like is used as the thermoplastic resin, 80 ° C. -200 degreeC is mentioned. The method for controlling the temperature of the granulation tank may be a method of directly heating the granulation tank, or a method of achieving this temperature range by cooling the granulation tank. Good.

  In addition to rotating members such as rotary blades, the contact probability between the thermoplastic resin and the powder is increased, and the thermoplastic resin and powder rise in the tank as the rotary blade in the granulation tank rotates. In order to prevent this, a blade may be provided at a position vertically above the rotating member. This blade lowers the thermoplastic resin and the powder below the granulation tank in order to bring the powder exemplified by the thermoplastic resin and the functional material into contact with the rotating member provided at the lower part of the granulation tank. is there. Further, in order to improve the contact probability between the powder and the thermoplastic resin, a chopper having a particle crushing action may be installed from the side or upper part of the granulation tank, and one or more choppers may be installed. Good.

  Further, the size of the rotating member may be 50% to 95% of the diameter of the granulation tank, and those having a shape and strength sufficient to cut the softened thermoplastic resin are preferably used.

  These rotary members and blades are both installed at a position within the range of 20% to 60% of the height of the tank from the bottom of the granulation tank. May be installed.

  The chopper is installed for the purpose of disturbing the movement of the mixture of the thermoplastic resin in the centrifugal direction generated by the rotary blade and the powder, preferably the functional material, and if this purpose is achieved, the installation method is not limited. It is preferable to install from the top lid of the tank so that the tip is directed toward the bottom. Moreover, if the said objective is achieved, the presence or absence of rotation will not be ask | required.

(Particle-containing sheet material according to the present invention and its molding method)
The particle-containing sheet material according to the present invention is composed of the above-described powder-integrated resin particles according to the present invention, and has various sheet-like shapes.

  The particle-containing sheet material according to the present invention uses a composition composed of powder-integrated resin particles obtained according to the granulation method of powder-integrated resin particles according to the present invention, and the composition thereof is formed into a sheet shape. What is necessary is just to shape | mold a thing by the shaping | molding method well-known in this technical field. The molding method is not particularly limited, and examples thereof include extrusion molding, cast molding, T-die molding, inflation molding, injection molding, and blow molding.

  In the particle-containing sheet material according to the present invention, the film thickness is not particularly limited as long as it can exhibit the characteristics of powder, but for example, it is preferably 30 μm or more and 300 μm or less. Within this range, the handling as a sheet is good while having the characteristics of the powder, particularly the effect of the functional material.

  In the method for forming a particle-containing sheet material according to the present invention, the composition comprising the powder-integrated resin particles may include various materials in addition to the powder-integrated resin particles. For example, various inorganic / organic compounds may be added to impart fluidity. In particular, when molding by extrusion molding, a second resin such as a polyethylene resin may be added in addition to the thermoplastic resin constituting the powder-integrated resin particles. Such a second resin is not particularly limited, and examples thereof include a thermoplastic resin such as polyethylene. In particular, the second resin may be a thermoplastic resin that constitutes the powder-integrated resin particles. Employing a thermoplastic resin as the second resin is preferable in that it has fluidity and heat sealability and can maintain the integrity as a sheet. The amount of the second resin added is preferably 10 to 30% by weight based on the total amount of the powder integrated resin particles. Within this range, fluidity can be imparted to the second resin during extrusion molding.

  EXAMPLES Hereinafter, although an Example and a comparative example are shown and this invention is demonstrated concretely, this invention is not restrict | limited to the following Example. In the examples, “parts” represents parts by weight.

(Examples 1-4, Comparative Examples 1-4)
In Examples, powders (average particle size 2 mm) obtained by kneading and pulverizing the following components were supplied to a mixing granulator to obtain powder integrated resin particles having the composition shown in Table 1. Table 2 shows the average particle diameter after processing and the results of microscopic observation.

  In this case, the mixing granulator has a mixing granulation tank having a bottom diameter of 40 cm and a height of 40 cm, a rotary blade having a diameter of 30 cm is provided at the center of the bottom, and a diameter at the top of the rotary blade. A 20 cm blade was placed parallel to the rotary blade. Moreover, the rotational speed of the rotary blade edge was set to 40 m / second, the rotational speed of the blade blade edge was set to 30 m / second, and one chopper was installed on the top of the tank lid. The temperature was controlled so that the temperature in the tank was 140 ° C. The grinding time was 20 minutes.

  In the comparative example, only the thermoplastic resin in the composition shown in Table 1 was pulverized, and then dry blended with the powder using a stirrer, and pelletized by a twin screw extruder as a subsequent process.

  The amount charged was about 4 kg in total for the examples and comparative examples of the powder and the thermoplastic resin.

  As the functional material used as the powder, molecular sieve 4A (manufactured by Union Showa Co., Ltd.) and CaO and alumina (both manufactured by High Purity Chemical Co., Ltd.) were used as zeolite. As the thermoplastic resin, LDPE (manufactured by Tosoh Corporation) and PP (Japan Polychem Corporation BC06C) were used.

  In Table 3, the state of a stainless steel vibration feeder having an inclined surface installed in a twin screw extruder used as a post-process was observed. The stainless steel surface in the above charging machine was set to the inclination angle shown in Table 3, and the powder integrated resin particles obtained in the examples and the pelletized ones obtained in the comparative examples were placed, and the fluidity when applying vibration was determined. confirmed. Furthermore, the workability was confirmed by putting it into the hopper of the twin screw extruder. The results are shown in Table 3.

  In the examples, the quantitative feeding into the extruder could be easily performed. However, in the comparative example, since the thermoplastic resin and the powder were separately added, a good masterbatch was obtained because the ratio of the particles having a large particle size with respect to the charging ratio increased or the fine powder remained in the transport system. Could not be produced.

(Example 5, Comparative Example 5)
In Example 1-4, it replaced with the powder and thermoplastic resin which are shown in Table 1, and it carried out similarly to Examples 1-4 using the powder and thermoplastic resin which are shown in Table 4, and integrated powder resin Particles were obtained. Next, the water-soluble organic resin shown in Table 4 was added to 100 parts of the powder integrated resin particles and kneaded. The obtained kneaded product was filled in a mold and a pressure of 10 kg / cm ² or more was applied. This was sintered at 200 ° C. for 1 hour to obtain a solidified product.

  About the obtained solidified material, the following odor absorption property, workability, and hardness were examined.

(Odor absorption)
A cylindrical solid product having a diameter of 2 mm and a height of 3 mm and a tablet containing triethylamine (active ingredient content: 10%) were placed in a sealed container and allowed to stand in an environment at a temperature of 25 ° C./relative humidity of 50% for 240 hours. Thereafter, the presence or absence of adsorption of the triethylamine component was detected using a GC-MS apparatus (Automass, manufactured by JEOL Ltd.), and the odor absorption property of the solidified product was evaluated. The results are shown in Table 5. In Table 5, ◯ indicates that the product has sufficient odor absorption, and − indicates that the evaluation could not be performed.

(With or without solidification)
The presence or absence of solidification of the obtained solidified product was evaluated sensorily. The results are shown in Table 5. In Table 5, “◯” indicates that the solidified sufficiently, and “X” indicates that the solidified.

(hardness)
A cylindrical solid product having a diameter of 2 mm and a height of 3 mm was prepared, and the hardness of the solid product was measured as a peak value at the time of crushing fracture using a digital force gauge (FGC-50, manufactured by SHIMPO). . The measured value is an average value of the number of measurements N = 7. The results are shown in Table 5.

(Example 6)
In Examples 1-4, it replaced with the powder and thermoplastic resin which are shown in Table 1, and Example except having used 30 parts of A type silica gel (made by Tokuyama Co., Ltd.) and 70 parts of PE as a powder. 1 to 4 were performed to obtain powder-integrated resin particles. 10 parts of PE was further added to the powder-integrated resin particles, and formed into a film having a thickness of 100 μm by extrusion molding. When this film was moisture-absorbed under the conditions of a temperature of 40 ° C. and a relative humidity of 90%, the moisture absorption amount was 9.0 g / m ² .

It is the schematic which shows the powder integrated resin particle by this invention.

Explanation of symbols

1 Powder-integrated resin particles 2 Granular support 4 Powder

Claims (16)

  A powder-integrated resin particle comprising a granular carrier made of a thermoplastic resin and a powder integrated on the surface of the granular carrier.   The powder-integrated resin particles according to claim 1, wherein the powder-integrated resin particles have an average particle size of 10 µm or more.   3. The powder-integrated resin particle according to claim 1, wherein the weight of the powder is 50% by weight to 900% by weight with respect to the weight of the thermoplastic resin.   The powder-integrated resin particle according to any one of claims 1 to 3, wherein a volume ratio of the thermoplastic resin to the powder is 1: 1 to 1:20.   A particle-containing molded article comprising the powder-integrated resin particles according to any one of claims 1 to 4 and a water-soluble organic resin.   The particle-containing molded article according to claim 5, wherein the content of the water-soluble organic resin is 2% by weight or more and 50% by weight or less based on the weight of the powder-integrated resin particles. A method for granulating powder-integrated resin particles comprising a granular carrier made of a thermoplastic resin and a powder integrated on the surface of the granular carrier,
Applying heat to the granular carrier so that the surface of the granular carrier is at least softened;
Attaching powder to the surface of the softened granular carrier;
A method for granulating powder-integrated resin particles, comprising:   The step of applying heat to the granular carrier is a step performed by frictional heat generated by contact between a rotating member that rotates in a sealed space and the granular carrier. The granulation method of the powder integrated resin particle as described.   A method for forming a particle-containing molded article, comprising the steps of adding a water-soluble organic resin to the powder-integrated resin particles according to any one of claims 1 to 4, kneading, and pressing.   A particle-containing sheet material comprising powder-integrated resin particles having a granular carrier made of a thermoplastic resin and powder integrated on the surface of the granular carrier.   The film thickness of the said particle | grain containing sheet material is 10 micrometers or more and 5 mm or less, The particle | grain containing sheet material of Claim 10 characterized by the above-mentioned.   The particle-containing sheet material according to claim 10 or 11, wherein the particle-containing sheet material further comprises a second resin.   The particle-containing sheet material according to claim 12, wherein the second resin is a thermoplastic resin. A method for forming a particle-containing sheet material comprising powder-integrated resin particles having a granular carrier made of a thermoplastic resin and powder integrated on the surface of the granular carrier,
Applying heat to the granular carrier so that the surface of the granular carrier is at least softened;
A step of attaching powder to the surface of the softened granular carrier to obtain powder-integrated resin particles;
Forming a composition comprising powder-integrated resin particles so as to form a sheet;
A method for forming a particle-containing sheet material, comprising:   The step of molding the composition comprising the powder-integrated resin particles is a step of adding a second resin and performing extrusion molding, The particle-containing sheet material according to claim 14, Molding method.   The method for molding a particle-containing sheet material according to claim 15, wherein the second resin is a thermoplastic resin.

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