JP2006225547A - Molding material composition, molded product and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a molding material composition by using an entire monocot material effectively and employing characteristics of a monocot material. <P>SOLUTION: This molding material composition comprises a self-adhesive fiber material mainly derived from a vascular bundle that is contained in a treated object obtained by steam treatment of one or more monocot material, and a self-adhesive powder material that consists of at least one part of a treated object obtained by the steam treatment of one or more monocot material. Using the molding material composition, a molded product with excellent characteristics is obtained, in which a parenchyma cell and the vascular bundle of the monocot material are effectively employed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a molding material composition, a molded body, and a method for producing the same, and in particular, relates to the use of a molding material having self-adhesiveness derived from a monocotyledon.

As shown in FIG. 1, monocotyledonous plants such as bamboo and palm are completely different in structure from dicotyledonous trees and do not have a rigid woody part. For this reason, monocotyledonous materials are difficult to be used for general uses as wood, and have been used only for a limited number of uses. In recent years, bamboo forests tend to increase, and effective uses of monocotyledonous plants such as bamboo are being searched. Here, as a technique for using bamboo, a technique for using bamboo after making it into a fiber has been studied. Since it is very difficult to collect fibers from raw bamboo, after cutting raw bamboo to an appropriate length and placing it in a high-pressure atmosphere, it was released into atmospheric pressure at once and exploded into a fiber shape. A technique for forming a board by solidifying the obtained bamboo fiber with a paste is disclosed (Patent Document 1). Similarly, a technique for forming a fiber reinforced resin molded article using bamboo fibers obtained by blasting bamboo is also disclosed (Patent Document 2). Blasting has the advantage that bamboo fiber can be defibrated without mechanical treatment. In these conventional techniques, from the viewpoint of effectively using bamboo as a fiber, explosive conditions suitable for fiberization are employed.
JP-A 63-7903 JP 2003-253011 A

  As shown in FIG. 1, the monocotyledonous plant has a vascular sheath as a tissue thus collected as a bamboo fiber, but was merely used as a normal fiber material. Moreover, although it has the parenchyma which fills the circumference | surroundings of these vascular sheaths, with the fiberization of bamboo, these parenchyma cells will also be processed simultaneously, and the non-fibrous form which occupies dozens of percent of the blasting processed material A processed powder was produced. However, little attention has been paid to processed cells of parenchyma until now, and the entire monocotyledon has not been effectively used. Therefore, conditions suitable for the use of parenchyma were not adopted.

  Accordingly, an object of the present invention is to provide a molding material composition, a molded body, and a method for producing the same that effectively use the entire monocotyledonous material and that utilize the characteristics of the monocotyledonous material.

  The inventors of the present invention have studied the effective use of monocotyledonous materials. As a result, the lignin, cellulose, and hemicellulose decomposition products in the monocotyledonous material are sufficiently generated, and fiber materials derived from vascular bundles and powder materials derived from parenchyma cells. It is possible to effectively use not only vascular bundle-derived parts of monocotyledonous materials but also parenchyma cells by holding or adhering to them, especially using monocotyledonous vascular bundle-derived fiber materials and parenchyma-derived powder materials as molding materials. Thus, the present inventors have found that a molded article having desirable characteristics can be obtained. That is, according to the present invention, the following means are provided.

  According to one aspect of the present invention, it is a molding material composition, and contains a self-adhesive fibrous molding material of 500 μm or more obtained by steaming one or more monocotyledonous materials. A composition is provided. According to this molding material, it is a preferable aspect that the length of 1 cm or more is 80 wt% or more. Furthermore, it is also a preferable aspect that the fibrous molding material is curled.

  Furthermore, in these compositions, it is a preferable aspect to contain a powdery molding material of 250 μm or less obtained by steaming one or more monocotyledonous materials. In a preferred embodiment, the powdery molding material is derived from the same kind of monocotyledonous material from which the fibrous molding material is derived. The monocotyledonous material is preferably bamboo material and / or palm material.

  According to another aspect of the present invention, a self-adhesive fibrous molding material of 500 μm or more obtained by steam-treating one or two or more monocotyledons is bonded to each other. A molded body is provided. In this molded body, the self-adhesive fibrous molding material is preferably curled, and is further obtained by subjecting one or more monocotyledonous materials to water vapor treatment, and having a thickness of 250 μm or less. It is a preferred embodiment that an adhesive powdery molding material is bonded to the fibrous molding material.

  Furthermore, according to another embodiment of the present invention, there is provided a method for producing a molded body, the step of steaming one or more monocotyledonous materials, and the maintenance of the treated product obtained by the steaming. A step of collecting a self-adhesive fibrous body from a tube bundle sheath portion and a self-adhesive powder-like body from a soft tissue portion of the treated product, at least a part of the self-adhesive fibrous body and the self-adhesive powder And a step of producing a molded body by hot-pressing at least a part of the body. In this production method, it is preferable that the monocotyledonous material is a bamboo material and / or a palm material.

  The molding material composition according to one aspect of the present invention is characterized by containing a self-adhesive fibrous molding material of 500 μm or more obtained by steaming one or more monocotyledonous materials. . Since this composition contains a fiber material having a self-adhesive property obtained from a monocotyledonous material and a powder material, not only the vascular bundle part of the monocotyledonous material but also the parenchyma part can be used effectively. In addition, since monocotyledons have a high sugar content, it is possible to obtain fiber materials and powder materials that are excellent in self-adhesiveness, and because these fibers and powder materials have good affinity, these are included. The composition has a composition suitable for obtaining a molded article, and a molded article having excellent strength can be easily obtained without adding a binder such as a resin. Hereinafter, the molding material composition, the method for producing a molded body, and the molded body will be described for various forms of the present invention.

(Molding material composition)
(Monocotyledon)
This molding material composition contains the structural component of the processed material obtained by carrying out the steam process of the 1 type (s) or 2 or more types of monocotyledonous materials. The monocotyledonous plant used for monocotyledonous material is a monocotyledonous plant and includes herbaceous plants and woody plants. In the present invention, among monocotyledonous plants, bamboos and palms having a high tree shape can be preferably used. Examples of such monocotyledonous plants include bamboo, palm, rice, Japanese pampas grass, corn, bagasse, bamboo shoot, banana, sasa, rush and sisal. This is because in these monocotyledonous plants, a large amount of fiber material and powder material can be collected, and a long fiber material can be easily collected. Examples of bamboo include moso-chiku, madake, and wasp. Examples of palms include palm and oil palm. As a monocotyledonous plant used for this invention, various monocotyledonous plants can be used 1 type or in combination of 2 or more types. Moreover, it is preferable to use the stem part of a monocotyledonous plant as a monocotyledon material.

  In the present invention, not only monocotyled material that has been collected and not yet processed, but also monocotyledonic material that has not been subjected to steam treatment, even if it has been used for other applications Can do. Therefore, the monocotyledon materials in the present invention include building materials and bamboo and palm used for various purposes.

(Self-adhesive fiber material)
The present molding material composition contains a self-adhesive fiber material in a processed product obtained by steaming a monocotyledon. The self-adhesive fiber material preferably has a length of 500 μm or more. Such a self-adhesive fiber material is obtained by subjecting a portion of the vascular bundle to steam treatment. The self-adhesive fiber material is more preferably 80 wt% or more of 3 cm or more long fibers. This is because such a composition is effective in expressing the strength of the molded body.

  Note that the self-adhesive fiber material may be curled. Here, curling means, for example, a state in which the fiber material is bent and bent by a method such as twisting, twisting, or winding (rolling) the fiber material. In particular, bamboo fiber can be curled only after being subjected to steam treatment.

  The self-adhesive fiber material can also maintain a two-dimensional or three-dimensional form depending on the configuration of a knitted fabric, a woven fabric, a non-woven fabric, or the like. Further, they may be entangled to form a felt shape or a mat shape. The self-adhesive fiber material can take various forms in order to impart properties required for the molded body to be obtained. As will be described later, the self-adhesive fiber material in the present molding material composition can be obtained in a desired range over a wide range. For this reason, various forms are easily provided to the self-adhesive fiber material. Further, a linear structure imparted to the self-adhesive fiber material or a higher order structure such as a two-dimensional form can be easily fixed by heating the self-adhesive fiber material.

  The self-adhesive fiber material is preferably at least partially softened or melted at 100 ° C. or higher and 260 ° C. or lower. It is because it can function as a reinforcing material sufficiently by having such thermal characteristics. More preferably, it is 120 degreeC or more and 220 degrees C or less.

(Self-adhesive powder material)
The molding composition can also include a self-adhesive powder material. The self-adhesive powder material can be obtained from a processed product obtained by steaming a monocotyledon. The self-adhesive powder material is preferably particles having a particle size of 250 μm or less. When the particle size is such, the compact can be effectively densified and the strength can be improved. Such a self-adhesive powder material can be obtained from a monocotyledonous basic structure, that is, a treated product obtained by steaming parenchymal cells. The self-adhesive powder material is preferably softened or melted at least partially at 100 ° C. or higher and 260 ° C. or lower. By having such thermal characteristics, a good matrix can be formed by filling the space between the self-adhesive fiber materials. More preferably, it is 120 degreeC or more and 220 degrees C or less.

  The monocotyledon derived from the self-adhesive powder material may be the same or different from the monocotyledon from which the self-adhesive fiber material is derived and the monocotyledon from which the self-adhesive powder material is derived. Good. Both materials may also be derived from the same individual monocotyledon. According to the manufacturing method of the present molding material composition described later, a self-adhesive fiber material and a self-adhesive powder material derived from the same monocotyledon can be easily obtained.

  Further, in the present molding material composition, the self-adhesive fiber material and the self-adhesive powder material may be defibrated or crushed to such an extent that the original monocotyledon derived from the original mold is not retained. You may take the aggregate form provided with the shape close | similar to the prototype of a cotyledon material, or its partial shape. That is, various columnar bodies such as a columnar shape and a prismatic shape, a plate shape, a semicircular or circularly incomplete cylindrical body, a cylindrical body, and the like. By having such a collective form, a molded body using the collective form can be manufactured by heating the entire collective form and maintaining the collective form as it is and molding or partially deforming it.

  Both the fiber material and the powder material constituting the composition have self-adhesive properties. The self-adhesiveness is due to the decomposition components generated with the steam treatment of the monocotyledon. The steam treatment for obtaining the self-adhesive fiber material and the self-adhesive powder material will be described in detail later.

  The present material composition is sufficient if it contains at least these two kinds of materials, but may contain a steamed product of dicotyledonous material using dicotyledonous plants. Similar to the monocotyledon, it is preferable from the viewpoint of biodegradability if it is derived from plants. Moreover, since the dicotyledonous material has a high lignin content, the strength and water resistance of the molded product can be improved. The steam-treated product derived from the dicotyledonous material is preferably in a powder form.

  The present molding material composition may contain other resin materials. As such other resin materials, ordinary thermoplastic resin materials, thermosetting resin materials, and biodegradable resin materials can be used. As the thermoplastic resin material, polyethylene, polypropylene, ABS, vinyl chloride, and the like can be used, and preferably, polypropylene and polyethylene can be used. Moreover, as a thermosetting resin, a phenol resin, a urea resin, a melamine resin, etc. can be used. Preferably, a phenol resin can be used. By using a biodegradable resin material, the biodegradability of the entire molded body can be easily ensured. As the biodegradable resin material, one or more selected from aliphatic polyester materials such as polylactic acid, poly-β-hydroxybutyric acid, and polybutylene succinate can be selected and used. These aliphatic polyester materials are preferable in terms of excellent biodegradability and availability.

  It should be noted that the present composition, particularly the molding composition, includes a resin material, and an ordinary molding composition such as an inorganic or organic filler, a plasticizer, a colorant, and a volatile solvent for securing strength and shaping. Various additives that the product can contain can be included. Examples of the inorganic filler include chip-like, spherical, needle-like, and fiber-like particles made of glass, metal, carbon-based material, and ceramic material. Moreover, as an inorganic filler, natural products, such as clay, can also be used, for example. Organic fillers include lignocellulosic materials (including flakes, spheres, irregularly shaped particles and fibers), protein materials (including particles and fibers), synthetic resin materials (particles or fibers), and wood flour. be able to.

(Manufacturing method of molding material)
In this production method, one or more monocotyledonous materials can be used in combination. When two or more kinds of monocotyledons are used, a self-adhesive powder material derived from different monocotyledons and a self-adhesive powder material derived from different monocotyledons can be obtained simultaneously.

  The monocotyledonous material becomes a self-adhesive fiber material and a self-adhesive powder material of the present composition through a steam treatment, but is preferably cut into an appropriate size prior to the steam treatment. For example, the maximum length of the fiber material obtained by the steam treatment depends on the length of the monocotyledon subjected to the steam treatment. Therefore, the size of the monocotyledon used for the steam treatment can be determined in consideration of the length of the fiber material to be obtained. According to this manufacturing method, the self-adhesive fiber material of desired length can be obtained by carrying out like this.

  The moisture content (on a dry weight basis) of the monocotyledonous material is preferably 120% or less (hereinafter referred to as weight% in terms of moisture content). This is because when the water content exceeds 120%, the decomposition component generated in the monocotyledon by the steam treatment tends to flow out, and the effective amount of the decomposition component is difficult to be retained in the processed fiber material or powder material. More preferably, it is 8% or more and 100% or less. Within such a range, the monocotyledonous material can be uniformly steamed to produce a decomposition component, and at the same time, the outflow of the decomposition component can be effectively suppressed, and a fiber material and a powder material having preferable moldability can be simultaneously used. Obtainable. If it is less than 8%, the exposure with water vapor tends to be non-uniform, and therefore, the generation of decomposition components becomes non-uniform, making it difficult to obtain a thermoplastic material with good fluidity. On the other hand, if it exceeds 100%, free water in the monocotyledon tends to be liberated during the steam treatment, and the decomposed components easily flow out of the monocotyledon with the liberation of this free water, and the binder performance of the processed product obtained. Decreases. More preferably, it is 15% or more and 100% or less. Furthermore, Preferably, they are 30% or more and 100% or less. The degree of moisture content can be adjusted in the step of drying the monocotyledon. Conversely, the moisture content can also be adjusted by applying moisture to the monocotyledonous material from the outside.

(Steam treatment process)
When the monocotyledon is treated with water vapor, cellulose components such as cellulose or hemicellulose contained in the material are subjected to hydrolysis and the like, and a decomposition component is generated. Further, the lignin component contained in the material is also denatured or decomposed to generate a decomposition component. Therefore, the processed product obtained by steam-treating the monocotyledonous material contains a cellulose-based decomposition component and a lignin-based decomposition component. Although such a material has not been sufficiently elucidated theoretically, at least a part thereof is melted by heating and develops plasticity, and thus can function as a binder for a substrate in a molded body.

  In order to obtain a material useful as a molding material, the lignin and cellulosic components in the monocotyledon are sufficiently decomposed by steam treatment to generate sufficient cellulose-based and / or lignin-based decomposed components in the monocotyledonous material. There is a need. Especially, it is necessary to fully decompose the cellulose component contained in a large amount in the monocotyledonous material. On the other hand, in the present invention, since a fiber material having a desired length is to be obtained from a monocotyledon, there is a certain limitation on the length along the vascular bundle direction of the monocotyledon as already described. As a result, there is a certain limitation on the size of the monocotyledon used for the steam treatment. Here, since the composition and production amount of the cellulose-based decomposition component and lignin-based decomposition component are greatly affected by temperature, if the sample to be subjected to the steam treatment is large, the generation amount and composition of the decomposition component even in the same material Although different, according to the present invention, a monocotyledon structure, that is, a structure in which a rigid vascular bundle portion is dispersed in a basic tissue mainly composed of parenchymal cells is used, and steam treatment is performed with a relatively large size. By performing the above, the vascular bundle part is mainly left as a fiber material, and the soft cells can be powdered, and at the same time, according to the present invention, sufficient self-adhesiveness can be imparted to any of them. In other words, even if the monocotyledon used for steam treatment is large, that is, even if there is a local difference in heat conduction, a structure in which the vascular sheath is dispersed in the basic tissue mainly composed of parenchyma As a result, the parenchymal cells are effectively heated by steam treatment and decomposed, and can be easily disintegrated into powder or powder, and can exhibit sufficient self-adhesion. In the tube bundle, the physical structure can be maintained by the presence of hard thick-wall fibers, and a self-adhesive decomposition product can be generated on the surface of the tube bundle. In addition, when using dicotyledonous material, because of the presence of the formation layer and the presence of a rigid woody part, in order to effectively generate decomposition components, the tree material is fragmented to give uniform and sufficient reactivity. There is a need. For this reason, it was practically impossible to construct reaction conditions capable of maintaining both fibers and powder.

  As a result, according to the present invention, by performing sufficient water vapor treatment on the monocotyledon having a structure different from that of the dicotyledonous material, the self-adhesive fiber material and the self-adhesive powder material are obtained. You can get it all at once. Furthermore, the self-adhesive powder material is derived from parenchyma cells, so it can be easily finely powdered and it is easy to express high self-adhesion, so it exhibits a good binder function for self-adhesive fiber materials. To do.

  The steam treatment can be carried out in various forms such as heating under saturated steam, but is preferably performed by exposing the monocotyledon to steam heated under high pressure in a pressure resistant vessel. Further, as described above, in order to obtain a self-adhesive fiber material and a powder material, preferably, the steam treatment in the present invention is preferably heated at about 100 ° C. or more, and the upper limit is preferably It is about 260 ° C. or lower. When the temperature is 100 ° C. or higher and 260 ° C. or lower, hemicellulose is decomposed while side reactions such as decomposition condensation can be suppressed. Preferably, it is heated to about 120 ° C. or more and about 220 ° C. or less. More preferably, the temperature is about 180 ° C. or higher and about 220 ° C. or lower.

  When the heating temperature is about 180 ° C. or more and about 220 ° C. or less, for example, the treatment may be performed for several minutes to several tens of minutes within the temperature range.

  When the water vapor treatment is terminated, the pressure can be gradually reduced, or the pressure can be released to atmospheric pressure all at once. When the pressure is released to atmospheric pressure all at once, the water inside the monocotyledon in the processing apparatus is vaporized all at once, causing an explosion in the monocotyledonous material and destroying the structure of the monocotyledonous material. As a result, the monocotyledonous material can be subdivided and pulverized into fibers, powders, etc. (hereinafter, pressure release from a high pressure state at once is called explosion). According to the explosion, the subsequent defibrating process can be omitted or simplified. Also, the drying process can be carried out efficiently. In addition, when carrying out blasting, it is preferable that the heating temperature in the steam treatment is 180 ° C. or higher and 260 ° C. or lower. More preferably, the temperature is about 200 ° C. or higher and about 230 ° C. or lower.

  In the processed product obtained by such steam treatment, these decomposition components are held in the tissue or are leached from the tissue to the material surface. The processed product is not necessarily physically decomposed into the fiber material and the powder material, but may be in a state including the form of the fiber material and the powder material by defibration or crushing. In addition, according to the explosion, it may be separated at once into the fiber material and the powder material.

(Drying process)
After the steam treatment, the treated product is preferably dried. When a large amount of moisture is present, when the material is heated and fluidized, the moisture may vaporize and the moldability or fluidity may be impaired. In addition, the decomposition component may move along with the evaporation of moisture and impair flowability and moldability.

  In general, the drying step is preferably carried out until the moisture content (dry basis) of the material is 28% or less. More preferably, it is dried to a moisture content of 12% or air dry. More preferably, it is dried until it becomes 8% or less.

  Although drying can be performed at normal temperature or high temperature, it is preferably actively dried after steam treatment. By evaporating the water at an early stage after the steam treatment, it is possible to suppress the separation of the water-soluble decomposition component together with the water, and to leave a large amount of the decomposition component in the cellulose-containing material. In addition, active drying means drying, providing the ventilation and / or heat | fever for promoting moisture evaporation. Specifically, the drying is performed at a high temperature equal to or lower than the steaming temperature, or the drying is performed by blowing air at room temperature. The moisture content can be measured according to JIS Z 2101 wood test method 3.2 moisture content.

(Defibration and / or crushing process)
In order to obtain the fiber material and the powder material from the treated product by the steam treatment, it is preferable to perform a defibrating and / or pulverizing step. Even when the blasting is performed, the fiber can be loosened by performing the pulverization and / or defibration process, and the powder can be refined or loosened to be in a form suitable for use. In addition, as already stated, in the case of maintaining a collective form that retains at least a part of the original monocotyledon during the steam treatment, there may be no need for a defibrating step or a pulverizing step at all. For defibration and / or pulverization, a known defibrator or pulverizer can be used. Examples of the defibrating machine include various defibrating machines such as beaters, rotations, teeth, needles, and those using fluid.

  Note that the fiber material and the powder material may or may not be separated after the defibrating step or the crushing step. When only one is required, it may be separated, but since it is a good molding material in a state where both are mixed, there is no need to separate it, and the molding composition can be used as it is. In the case of further sizing or secondary processing of only fiber material or powder material, it is easy to separate the material for sizing, etc., and sizing one material as necessary Can do. Further, when the fiber material is twisted or spun, the fiber material can be separated as necessary. In addition, the manufacturing method of the molding material of the present invention can also obtain a self-adhesive fiber material and a self-adhesive powder material, both of which are molding materials, but need to be used as molding materials at the same time. There is no.

  According to the manufacturing method of the present molding material, different forms, that is, a self-adhesive fiber material and a self-adhesive powder material can be obtained simultaneously from the monocotyledonous material. For this reason, a monocotyledon can be used effectively. In addition, the composition containing both has a self-adhesive property as a molding material composition and also has an affinity in composition, and the fiber material is excellent in strength and workability, and is a powder material. Is excellent in fluidity and filling properties, and is a preferable molding material composition. In particular, it is lightweight and has excellent bending strength (bending strength and bending Young's modulus).

(Use of this material)
The powder material and fiber material contained in this molding material have self-adhesive properties, and can be used as molding materials. Self-adhesive powder materials can be used as binders, as well as plasticizers and fillers. It can also be used as an agent. Moreover, since the self-adhesive fiber material is a tough fiber material and has self-adhesiveness, it can be applied to binders and / or reinforcing materials in other resin moldings.

(Method for producing molded body)
By heating the present molding material composition thus obtained and imparting a shape, a molded body can be produced. In manufacturing a molded body, a molding precursor having a shape and size suitable for molding, conveyance, and handling can be obtained. Such a precursor can be obtained by pressing at least the molding material. This is because the decomposition component inherent in the material has caking properties even at room temperature. Moreover, since the self-adhesive material contained in the present molding material composition can retain various higher order structures as described above, it can be a molding precursor having such a higher order structure. Moreover, if the adhesiveness of the self-adhesive fiber material or the self-adhesive powder material is utilized, the shape of the molding precursor can be easily maintained.

  The heating conditions in the molding process can be determined in consideration of the thermal characteristics of the self-adhesive fiber material and the self-adhesive powder material. Among these, it is preferable to consider the thermal characteristics of the self-adhesive powder material. When monocotyledonous material is used, it can be set to about 100 ° C. or more and about 260 ° C. or less, although it varies depending on the steam treatment conditions. Preferably, it is about 110 ° C. or higher, more preferably about 150 ° C. or higher, further preferably about 170 ° C. or higher, and most preferably about 180 ° C. or higher. Moreover, it is preferable to set it as about 230 degrees C or less. The heating temperature can be set relatively low when the temperature during the steam treatment is high, and is preferably set relatively high when the steam treatment temperature is low.

  After the molding material composition is heated and plasticized, a molded body can be obtained by applying an appropriate shape imparting means. As the shape imparting means, for example, a conventionally known means for using a mold or passing a die can be used. Then, a molded object can be obtained by cooling. The molding method can be applied to various molding methods such as injection molding, extrusion molding, compression molding, blow molding, calender molding, profile extrusion molding, stamping molding, stampable molding, and stamping molding including sheet stamping.

(Molded body)
A shaped product can be obtained by cooling after the shape is imparted to the molding composition. The obtained molded body is a molded body including a fiber material and a powder material. Since it contains a fiber material derived from a monocotyledon, it is a molded body that is lightweight (small density) and excellent in strength (bending strength and bending Young's modulus).

  The molded body can be used as a substitute for various resin materials in addition to building materials including laminates and interior / exterior materials such as handles, handrails, flooring materials, wall materials, pillar materials, and decorative plates. Furthermore, the molded body is also suitable as a base material for interior parts for vehicles such as instrument panels, club boxes, door trims, ashtrays, console boxes, seat backs, and trunk room trays.

(Biodegradable)
Since this molded object contains the fiber material and powder material which originate in the steam-processed material of a monocotyledon, it shows favorable biodegradability. In particular, when it is composed only of a self-adhesive fiber material and a self-adhesive powder material without containing a resin or the like, it exhibits extremely good biodegradability. Moreover, based on the thermoplasticity of a fiber material and a powder material, plasticity can be expressed again by heating. Therefore, when the molded body is no longer needed, it can be used again as a molding material by heating again. That is, a new shape can be given with the composition as it is, or a new shape can be given in combination with other materials. Furthermore, it can be diverted to other uses as a filler. In addition, by plasticizing the used molded body that has been used, it can be separated from or recovered from composite materials such as other fillers and resin materials in the molded body.

  EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated concretely, this invention is not limited to a following example.

(1) The bamboo material was cut into 2 m lengths and appropriately vertically split and heated to 200 ° C. and steamed at 200 ° C. for 20 minutes. Then, it cooled gradually, pressure was reduced, and it was air-dried to the air dry moisture content. The dried product was defibrated by using a tooth extraction type refiner set at a tooth spacing of 0.5 mm. This was classified, and a fiber whose fiber mesh did not pass 250 μm (fiber length: 250 μm or more and 30 mm or less) was used as a molding material.

(2) Each of the molding materials obtained above was used as a molding material composition as it was to produce a molding. That is, the molding material composition was constituted without using any other materials other than the present molding material. This molding composition was heated with a hot press at a temperature of 180 ° C. for 5 minutes to produce a molded body (board) having a thickness of 5 mm. The following characteristics were measured for each obtained molded body. Table 1 shows the characteristics of the obtained molded body.

1. Density JIS A 5905 fiberboard 6.3 Density test Bending test (bending strength and bending Young's modulus)
Bending strength: JIS Z 5905 fiberboard 6.6 bending strength test Bending Young's modulus: JIS Z 5905 fiberboard 6.6 bending strength test was applied.
3. Water absorption thickness expansion coefficient JIS A 5905 fiberboard 6.9 Water absorption thickness expansion coefficient test 4. Water absorption JIS A 5905 fiberboard 6.8 water absorption test

  As shown in Table 1, a good molded product could be obtained from any molding material composition. That is, it can be seen that both the fiber material and the powder material constituting these molding material compositions have good self-adhesive properties. In addition, all the obtained molded articles had a density of 1 or less and light weight, while exhibiting excellent numerical values in bending strength and bending Young's modulus. For this reason, according to the molding material composition derived from the monocotyledon steam-treated product, the structure of the monocotyledonous material, that is, the structure in which the vascular bundle is dispersed in the basic tissue mainly composed of parenchymal cells is effectively used. Thus, it was found that a self-adhesive fiber material and a self-adhesive powder material can be obtained, and further, an effective molded product can be obtained even if these are used as they are as a molding material composition.

The figure which shows the difference in the structure | tissue of a monocotyledon and a dicotyledonous tree.

Claims (11)

A self-adhesive molding material composition comprising:
A composition containing a fibrous molding material of 500 μm or more obtained by steaming one or more monocotyledonous materials.   The molding material composition according to claim 1, wherein the fibrous molding material has a long fiber of 1 cm or more in an amount of 80 wt% or more.   The molding material composition according to claim 1 or 2, wherein the fibrous molding material is curled.   The molding material composition in any one of Claims 1-3 containing the powdery molding material of 250 micrometers or less obtained by carrying out the steam process of 1 type, or 2 or more types of monocotyledon materials.   The molding material composition according to any one of claims 1 to 4, wherein the powdery molding material is derived from the same kind of monocotyledonous material from which the fibrous molding material is derived.   The molding material composition according to claim 1, wherein the monocotyledonous material is bamboo material and / or palm material. A molded body,
A molded article in which self-adhesive fibrous molding materials of 500 μm or more obtained by steaming one or more monocotyledonous materials are bonded to each other.   The molded article according to claim 7, wherein the self-adhesive fibrous molding material is curled.   Furthermore, the self-adhesive powdery molding material of 250 micrometers or less obtained by carrying out the steam process of the 1 type (s) or 2 or more types of monocotyledon material is couple | bonded with the said fibrous molding material. Molded body. A method for producing a molded body, comprising:
Steaming one or more monocotyledonous materials; and
Collecting a self-adhesive fibrous body from the vascular sheath part of the treated product obtained by the steam treatment and a self-adhesive powdery body from the soft tissue part of the treated product;
Producing a molded body by hot pressing at least a part of the self-adhesive fibrous body and at least a part of the self-adhesive powder;
A manufacturing method comprising:   The said monocotyledon material is a manufacturing method of the molded object of Claim 10 which is a bamboo material and / or a palm material.

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