JP4537180B2 - Method for producing resin composition - Google Patents

Description

  The present invention relates to a method for producing a resin composition in which a reinforcing material is blended with a thermoplastic resin as a base material, and is particularly suitable when natural fibers are used as the reinforcing material.

  In order to increase the strength, dimensional stability, and rigidity of polymer composite materials based on thermoplastic resins such as polypropylene (PP), polyethylene (PE), and polyamide (PA), glass fiber is used as a reinforcing material. Often used.

By the way, in recent years, with the recycling of resources, instead of glass fibers that require a lot of energy for incineration and are difficult to dispose of, natural fibers such as hemp fibers (jute, kenaf, etc.) and bamboo fibers are used as reinforcing materials. Attempts have been made (see, for example, Patent Document 1).
JP 2002-210838 A

  These natural fibers can be easily incinerated and discarded as compared with glass fibers, and have the advantages of low environmental impact, etc., so that the final disposal of composite materials using this as a reinforcing material becomes easy. .

  In order to exhibit the properties of such natural fibers more effectively, or to ensure sufficient strength for practical use as a composite material, the content of natural fibers (here, the content is natural fibers) It is necessary to increase the value obtained by dividing the mass of the product by the mass of the produced pellets as a percentage (the same applies hereinafter).

  By the way, in general, a resin product is formed into a desired shape by once forming resin pellets with an extruder and then supplying the resin pellets to an injection molding machine or the like. However, conventionally, there is a limit to increasing the content of natural fibers in the pellets, and thus there has been a limit to improving the strength of the natural fiber composite material.

  As a means of achieving a high content of natural fibers, for example, it is conceivable to send resin pellets and natural fibers to the hopper of an extruder, and to send only natural fibers from the side feeder separately. The pellets molded in (1) have the disadvantage that the content of natural fibers varies from one pellet to the other and the distribution of natural fibers in the pellets is non-uniform. In addition, particularly when bamboo fibers are used as natural fibers, there is a problem that bamboo fibers break during the pellet forming process and the average fiber length in the pellets decreases. This is usually used in the form of a bamboo fiber bundle in which the bamboo fiber is an aggregate of monofilaments (single fibers), and since this fiber bundle is rigid, it tends to break during kneading, transporting and pressing with a screw. It depends.

  As another means, it is conceivable to first form pellets having a low content rate with an extruder, and then replenish new natural fibers in the pellets and feed them again into the extruder. However, in this method, since the pellet material (natural fiber and thermoplastic resin) is exposed to a high temperature state for a long time, thermal degradation of the pellet material is inevitable, and the fiber (particularly bamboo fiber) is broken by multiple kneading. Further, since the extrusion molding is performed twice or more times, problems such as an increase in pellet molding cost inevitably occur.

  For these reasons, it is difficult to increase the content of natural fibers in the past, and for example, bamboo fibers cannot be stably molded with high quality pellets having a content of 50% or more. It was.

  The subject of this invention is providing the manufacturing method of the resin composition which enabled high content of the reinforcing material including a natural fiber, and suppressed the dispersion | variation in content rate.

In order to solve the above problems, a method for producing a resin composition according to the present invention is a sheet-like member made of the thermoplastic resin when producing a resin composition in which a reinforcing material is blended with a thermoplastic resin as a base material. A composite having a reinforcing material held therein is formed, and the composite is supplied to an extruder and molded , and the composite has a storage portion for storing the reinforcing material as a sheet-like member. And the storage portion is formed by winding a sheet-like member into a roll shape .
In addition, in order to solve the above-described problems, the method for producing a resin composition according to the present invention is a sheet-like member made of a thermoplastic resin when producing a resin composition in which a reinforcing material is blended with a thermoplastic resin as a base material. And forming a composite material in which the reinforcing material is held inside, supplying the composite material to an extruder, and forming the composite material into a sheet-like member. The storage portion is formed by bending the sheet-like member and joining both sides of the bending portion.
In addition, in order to solve the above-described problems, the method for producing a resin composition according to the present invention is a sheet-like member made of a thermoplastic resin when producing a resin composition in which a reinforcing material is blended with a thermoplastic resin as a base material. And forming a composite material in which the reinforcing material is held inside, supplying the composite material to an extruder, and forming the composite material into a sheet-like member. The housing portion is formed by overlapping two sheet-like members and joining the sheet-like members on both sides thereof.

  According to this manufacturing method, a certain amount of reinforcing material is confined by the sheet-like member, and the reinforcing material is surrounded by the thermoplastic resin. Therefore, if this is supplied to an extruder and melted, the reinforcing material can be uniformly dispersed in the resin, and the reinforcing material can be uniformly contained at a high content. Therefore, for example, even when bamboo fiber is used as the reinforcing material, a high-strength resin composition having a content exceeding 50% can be stably obtained. Further, since this resin composition can be molded by one extrusion molding, the thermal deterioration of the resin and the reinforcing material, which becomes a problem when performing the extrusion molding a plurality of times as in the prior art, is avoided. Furthermore, when the thermoplastic resin is used in the form of a sheet, the specific surface area is increased as compared with the case where it is used in the form of a pellet, and it is easy to receive heat from the barrel and shear heat generated by the screw. Therefore, the shearing force required for melting the thermoplastic resin can be reduced, and the frequency of breakage and breakage of the reinforcing material can be reduced.

  The form of the reinforcing material is not particularly limited, and it is possible to use a fiber, a powder, a scale, or a whisker. In addition to the natural material, various organic and inorganic materials can be used as the reinforcing material. As a reinforcing material, you may use not only 1 type but in combination of 2 or more types.

  “Extruder” includes materials used in other resin molding devices such as injection molding devices and blow molding devices, as well as devices used alone for extrusion molding such as pellet molding, film molding, sheet molding, and pipe molding. Also included are those incorporated for supply.

Note that the sheet-like member is formed of, for example, any one of a nonwoven fabric, a film, and a cotton-like structure in any of the above methods .

  The sheet-like member may include at least a low melting point resin and a fibrous high melting point resin. In this case, the fibrous high-melting point resin remains unmelted by melting the sheet-like member having the above configuration at a temperature lower than the melting point of the high-melting point resin by an extruder. Therefore, not only the reinforcing material (for example, natural fibers such as hemp fiber and bamboo fiber) previously held in the sheet-like member but also the unmelted fibrous high-melting point resin acts as the reinforcing material. Thereby, the further intensity | strength (impact resistance etc.) improvement of a resin composition is aimed at.

  As a structural example of the sheet-like member having the above action, for example, a nonwoven fabric composed of fibers made of a low melting point resin and fibers made of a high melting point resin can be considered. Or the nonwoven fabric comprised with the composite fiber which consists of low melting-point resin and high melting-point resin can be considered.

  The “low melting point resin” herein is a thermoplastic resin having a relatively low melting point compared to a high melting point resin, and specifically, a resin having a melting point of less than 200 ° C. is desirable. The “high melting point resin” is a thermoplastic resin having a relatively high melting point compared to the low melting point resin, and specifically, a resin having a melting point of 200 ° C. or higher is desirable. The difference between the low melting point side and the high melting point side based on 200 ° C. is that the natural fiber used as the reinforcing material is mainly composed of cellulose (including hemicellulose and lignin), and the decomposition of cellulose. This is because the temperature is about 200 ° C. (depending on the type of fiber or cellulose, there is a variation of 20 to 30 ° C. in the vertical direction).

  Examples of the low melting point resin include polypropylene (PP, melting point: about 170 ° C.), high density polyethylene (HDPE, melting point: about 140 ° C.), low density polyethylene (LDPE, melting point: about 120 ° C.), linear low Polyolefin resins such as copolymers comprising two or more of α-olefins such as density polyethylene (LLDPE, melting point: about 125 ° C.), ethylene, propylene, butene-1, hexene-1, octene-1; Modified polyolefin resin modified with saturated carboxylic acid or derivatives thereof; ethylene-vinyl acetate resin (EVA, melting point: about 90 ° C.); polyamide resin such as polyamide 12 (melting point: about 180 ° C.); acrylic resin (melting point) : About 190 ° C.); POM resin (melting point: about 180 ° C.); AS resin (not showing clear melting point but melted below 200 ° C.); ABS Fat (definite melting point is not shown but melt below 200 ° C.); such homopolymer resins and copolymer resins, more like a resin obtained by blending two or more thereof can be used. Among those listed above, polyolefin resins, modified polyolefin resins, ethylene-vinyl acetate resins, or two types of these resins are particularly suitable for achieving both physical properties (for example, chemical resistance and gas barrier properties) and cost of molded products. The above blended resin can be suitably used.

  Examples of the high melting point resin include polyamide resins such as polyamide 6 (melting point: about 225 ° C.), polyamide 66 (melting point: about 260 ° C.), aromatic polyamide (melting point: about 240 ° C.); polyethylene terephthalate (PET) , Melting point: 260 ° C.), polyester resins such as polybutylene terephthalate (PBT, melting point: about 225 ° C.); polyphenylene sulfide (PPS, melting point: about 290 ° C.); polystyrene resin (melting point: about 230 ° C.); polycarbonate ( PC, a melting point not clearly shown, but melting at 200 ° C. or higher); and the like, and a resin obtained by blending two or more of these resins can be used. Among those listed above, polyamide resin, polyethylene terephthalate (PET), polycarbonate (PC), or these resins are particularly suitable for achieving both physical properties (for example, strength, heat resistance, wear resistance) and cost of molded products. Two or more kinds of blended resins can be suitably used.

  The low melting point resin and the high melting point resin can be used in any combination. Also, taking into account the wettability, adhesion, etc. between the low melting point resin in the molten state and the high melting point resin remaining as fibers, the combination of polypropylene and polyamide resin, or ABS resin and polycarbonate can be obtained. More preferred.

  By molding the pellets with an extruder using the method described above, high-quality pellets containing a high amount of reinforcing material and having a uniform content can be stably molded. High-strength resin products can be molded.

  As described above, according to the method for producing a resin composition according to the present invention, the content of the reinforcing material can be increased more than before, and a high-quality resin composition with reduced variation in the content is molded. It becomes possible.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1A to 1C schematically illustrate an embodiment of a method for producing a resin composition according to the present invention. Hereinafter, a specific manufacturing process will be described in detail based on this drawing.

  As shown in FIG. 1A, first, a flexible sheet-like member 1 is formed of a thermoplastic resin such as polypropylene or polyethylene. The sheet-like member 1 has a sheet shape mainly composed of a pellet base material resin, and is formed of, for example, a nonwoven fabric of the resin fibers. The method for forming the nonwoven fabric is not particularly limited. For example, a cotton-like sheet (web) of the resin fibers is formed by a card machine, and an adhesive resin for adhering the resin fibers to the cotton-like sheet is applied or impregnated. There are a method of hot pressing and a spunbond method in which a nonwoven fabric is obtained by forming a sheet obtained by melt spinning a thermoplastic resin. In addition, you may form the sheet-like member 1 with the aggregate (cotton-like structure | tissue) of the resin fiber defibrated with the resin film or the defibrating machine. In addition, the sheet-like member 1 can be used as a single sheet or a plurality of sheets. In this case, each sheet-like member 1 is formed of a different kind of resin material in addition to the same kind of resin material. You can also. In addition, as said thermoplastic resin, biodegradable resins, such as polylactic acid and polycaprolactone, can also be used, for example. In this case, biomass pellets having biodegradability can be formed together with natural fibers having biodegradability.

  Next, natural fibers as the reinforcing material 2 are evenly spread on the sheet-like member 1 in a state where the above-mentioned sheet-like member 1 is spread on a plane (see FIGS. 1A and 1B). The kind of natural fiber is not particularly limited, and hemp-based fibers such as jute and kenaf, bamboo fibers, and the like are selected and used according to the characteristics and applications required of the pellets. In this embodiment, the case where the bamboo fiber 2 which has advantages, such as a small void | hole in a fiber compared with a hemp-type fiber and few dimensional changes by water absorption, is illustrated. The bamboo fiber 2 is a fiber bundle in which a plurality of monofilaments are gathered, and is collected, for example, by crushing or exploding raw bamboo by a mechanical method.

  When the bamboo fiber 2 is sprayed, the spray amount per unit area of the sheet-like member 1 may be adjusted according to the desired content rate. In the figure, the bamboo fibers 2 are dispersed in a random direction, but can be dispersed in a state of being oriented in one direction. Further, as shown in the figure, in addition to spreading over the entire surface of the sheet-like member 1, it may be spread like a band along the winding axis direction of the sheet-like member described later.

  Next, the sheet-like member 1 on which the bamboo fibers 2 are evenly spread is wound in a roll shape with the spreading surface inside so that the bamboo fibers 2 do not leak from the sheet-like member 1 to form a rod-shaped composite 3. (See FIG. 1C). Thereby, the composite 3 becomes the form which filled the bamboo fiber 2 in the accommodating part 5 which makes the spiral shape in the radial direction continuous in the axial direction. The bamboo fibers 2 in the housing part 5 are held in a substantially fixed position by the frictional force acting between the sheet-like members 1 and between the bamboo fibers 2 and do not spill out in large quantities even when the composite 3 is tilted. .

  Next, as shown in FIG. 2, the composite 3 is put into a hopper 4 a of the extruder 4. At this time, if the sheet-like member 1 is continuously fed out and continuously rolled to form the composite 3 continuously, the composite 3 is sequentially supplied from the longitudinal direction to the hopper 4a, so that the pellets Continuous molding is possible.

  As shown in FIG. 2, the extruder 4 includes a hopper 4a that serves as an inlet for pellet material (here, the composite 3), a screw 4b that transports, kneads, and presses the pellet material charged from the hopper 4a, and a screw Main components are a heating unit 4c for heating the pellet material transported with the rotation of 4b from the outside, a cylinder 4d provided with the heating unit 4c on its outer periphery, and a driving device 4e for rotating the screw 4b. It is configured as. The screw 4b may be uniaxial or biaxial.

  The composite 3 fed into the hopper 4a is heated and melted by the heating unit 4c provided on the outer periphery of the cylinder 4d, and is transported downstream (rightward in FIG. 2) while being kneaded by the screw 4b. The molten resin is extruded together with the bamboo fiber 2 from the die 4f at the tip of the cylinder 4d into a string shape, and then cut into a pellet by cutting at a predetermined pitch in the longitudinal direction by means such as underwater cutting or air hot cut.

  In the pellet forming process described above, the bamboo fiber 2 is surrounded by the thermoplastic resin in the state of the composite 3, so that the bamboo fiber 2 is in the resin from the initial stage of melting in the extruder 4. Disperse uniformly. Therefore, even if the ratio of bamboo fiber 2 is increased, variation in the content can be suppressed, and pellets having a high content exceeding 50% can be stably formed. Further, since this pellet is formed by one extrusion molding, it is possible to avoid thermal deterioration of the base material resin and bamboo fiber as compared with the case where the pellet is repeatedly supplied to the extruder. Furthermore, when the thermoplastic resin is used in the form of a sheet, the specific surface area becomes larger than when it is used in the form of a pellet, and it is easy to receive heat from the barrel and shear heat generated by the screw. Therefore, a small shearing force is required for melting the thermoplastic resin, and breakage of the bamboo fiber 2 is suppressed.

  As mentioned above, although one embodiment of the present invention was described, this form is only an example, and as long as the above-mentioned operation is achieved, an embodiment different from the above form can be taken.

  For example, the composite 3 may be formed by partitioning the storage portion 5 for storing a reinforcing material such as bamboo fiber with the sheet-like member 1. Therefore, the shape (cross-sectional shape in the radial direction) of the accommodating portion 5 is not limited to the spiral shape shown in FIG. 1C, but various shapes such as a cylindrical shape or a shape in which this is crushed in the radial direction (flat shape). It can be in the form. For example, as shown in FIG. 3 (a), the composite 3 having a cylindrical accommodating portion 5 is formed by bending the sheet-like member 1 and spraying bamboo fibers 2 on the curved portion 1a. As shown in FIG. 4B, the both sides 1b of the bending portion 1a can be formed by joining, for example, by heat fusion, stitching with fibers, or other mechanical methods (for example, resin fasteners). Moreover, although illustration is abbreviate | omitted, after disperse | distributing the bamboo fiber 2 on the sheet-like member 1, the composite body 3 which has the flat accommodating part 5 further overlaps the sheet-like member 1 on it, and the spreading | diffusion area | region It can form by joining the sheet-like members 1 by the said joining means on both sides. Alternatively, the composite 3 is also formed by repeating the above operation a plurality of times to overlap a plurality of sheet-like members 1 and joining them together.

  In each of the composites 3 described above, after the bamboo fiber 2 is sprayed, the housing portion 5 is formed afterwards in the interior, but on the contrary, first, the sheet-like member 1 is used. After the accommodation portion 5 is partitioned and formed, the accommodation portion 5 may be filled with the bamboo fiber 2.

  In addition, as the composite 3, a sheet-like member 1 having a cotton-like structure and bamboo fibers 2 as a reinforcing material mixed in the cotton-like structure can be used. Specifically, after the resin fibers are defibrated, the resin fibers and the bamboo fibers 2 are simultaneously supplied to the card machine, whereby the bamboo fibers 2 are entangled with the resin fibers to form the nonwoven fabric-like composite 3. . The composite 3 can be supplied to the extruder 4 as it is, or can be further twisted and deformed into a rod shape before being supplied to the extruder 4.

  Moreover, in the above description, although the case where the sheet-like member 1 was comprised with the nonwoven fabric which consists of one type of thermoplastic resin was illustrated, the nonwoven fabric which has a form other than this can also be used.

  For example, the sheet-like member 1 can be a non-woven fabric containing at least a low melting point resin and a fibrous high melting point resin. In this case, the sheet-like member 1 is melted at a temperature lower than the high-melting point resin by the extruder 4 so that only the low-melting point resin is melted and becomes a base resin for the pellets, and the fibrous high-melting point resin is bamboo. A pellet remaining in the inside as a reinforcing material together with the fibers 2 is obtained. Therefore, the pellets as a molded product can be made to have higher strength (including bending rigidity, bending strength, impact strength, etc.) by the reinforcing action of the resin fibers on the high melting point side in addition to the bamboo fibers.

  The blending ratio of the fibrous high-melting-point fibers constituting the nonwoven fabric, the low-melting-point resin serving as the base resin, and the bamboo fibers is, for example, 50% by weight for the bamboo fibers and 10-40 wt% for the high-melting point resins. %, Low melting point resin: It is good to set so that it may become 40-10 wt%. This is because if the amount of fibrous high-melting point resin is too small, the effect of improving the impact resistance and heat resistance of the molded product due to the high-melting point resin remaining in the fibrous form is reduced. This is because if the amount is too small, the binder effect for binding the bamboo fiber 2 as a reinforcing material and the resin fiber on the high melting point side to each other is insufficient.

  As a nonwoven fabric containing the said fibrous high melting point resin, what made both low melting point resin and high melting point resin into fibrous form is mentioned, for example. According to this, since the high melting point resin fiber and the low melting point resin fiber molded separately can be mixed at an arbitrary ratio, the blending ratio of the base resin to the bamboo fiber 2 in the molded product pellet, and the resin fiber Can be easily changed according to the purpose of use.

  In addition, examples of the nonwoven fabric containing a fibrous high-melting point resin include those containing a composite composed of a fibrous high-melting point resin and a sheath-like low melting point resin covering the fibrous high-melting point resin. According to this configuration, the high melting point resin and the low melting point resin are not unevenly distributed at the time of pellet molding or at the time of forming the nonwoven fabric as the preceding stage. Therefore, it is possible to produce pellets with uniform content ratios, with no variation in resin fibers and base material resin.

  As the resin fiber to be used, either short fiber or long fiber can be used regardless of the configuration of the nonwoven fabric. This is because the fibrous high-melting-point resin remaining in the form of long fibers is folded in the kneading step at the time of molding and shortened. Further, when the reinforcing action of the resin composition by the resin fiber is not required, the molding temperature can be set to be equal to or higher than the melting point of the thermoplastic resin having the highest melting point. In this case, all the resin fibers constituting the nonwoven fabric are melted and a mixture of the low melting point resin and the high melting point resin becomes the pellet base resin. Thereby, the polymer blend of the base resin can be performed simultaneously with the molding of the pellet. Moreover, the heat resistance, chemical resistance, gas barrier property, abrasion resistance, and slidability of each resin can be appropriately adjusted according to the purpose of use by blending the resins.

  Moreover, although the case where bamboo fiber is used as the reinforcing material is illustrated in the above description, instead of (or in addition to) wood or bamboo chips, or powder thereof may be used as the reinforcing material. it can.

In order to prove the usefulness of the production method according to the present invention, pellet-shaped polypropylene is used as a base material, bamboo fiber is used as a reinforcing material, and pellets are molded by a conventional biaxial kneading extruder, and polypropylene is used as a sheet-like member. Using the long fiber nonwoven fabric (fiber diameter 25 μm, basis weight 40 g / m ² ) made of resin fibers, the content Wf of bamboo fiber 2 was measured for the pellets molded by the molding method of the present invention described above. In addition, about any pellet, the processing temperature at the time of manufacture was 200 degreeC. The target bamboo fiber content was Wf = 50%. Bamboo fibers having a diameter of 0.25 mm or less and a fiber length of 1 to 20 mm were selected and used. The average fiber length of the bamboo fiber is 10 mm.

  FIG. 4 shows the measurement results for each of the pellets molded by the two types of molding methods. The horizontal axis in the figure represents the bamboo fiber content as a percentage of the target value. For example, a numerical value of 100 on the horizontal axis means that the value is 100% with respect to the target value, and in this example, the content is Wf = 50%. Moreover, the vertical axis | shaft in a figure represents the generation frequency with respect to all the pellets (200 pieces in this example) of a specific content rate. When this is seen, the average of the content rate Wf (represented by the dotted line in the figure) in the pellets molded by the conventional method is far below the target value Wf = 50%. In addition, the distribution is very wide, and the variation in the content rate Wf is large. This is because a considerable amount of bamboo fiber remained in the hopper during pellet molding, or there was a lot of bamboo fiber that could not be fed into the extruder due to poor fiber surface slip when injected from the side feeder side. Conceivable.

  On the other hand, the average of the content rate Wf (represented by the solid line in the figure) in the pellets molded by the molding method according to the present invention substantially coincides with the target value, and the distribution width thereof is also larger than that of the conventional product. It was confirmed that it was much smaller.

Next, when pelletized polypropylene is used as the base material and bamboo fiber is used as the reinforcing material, the pellet material is kneaded with a kneader and then molded with a uniaxial kneading extruder (conventional method), and the sheet-like member is made of polypropylene. Bamboo fiber length in each pellet was measured for pellets formed by the method of the present invention using a long fiber nonwoven fabric (fiber diameter 25 μm, basis weight 40 g / m ² ) made of resin fibers. In addition, about any pellet, the processing temperature at the time of manufacture was 200 degreeC. Moreover, the target content rate was set to Wf = 65%. Bamboo fibers having a diameter of 0.125 to 0.25 mm and an average fiber length of 17 mm were used.

  As a result, even with the pellets molded by the conventional method, the target content of Wf = 65% could be achieved, but as shown in FIG. 5, the bamboo fiber length in the pellet (represented by the dotted line in the figure) All of which were very short, 2 mm or less. In addition, since the thermal history of 200 ° C. or higher was received in the kneader and the extruder, the thermal deterioration generated in the bamboo fiber was also increased.

  On the other hand, in the pellet molded by the method of the present invention, the fiber length of the bamboo fiber (represented by the solid line in the figure) is shorter than the bamboo fiber length before molding, but unlike the conventional method, Many bamboo fibers having a fiber length of 2 mm or more were contained, and it was confirmed that fiber breakage was suppressed.

  Further, an injection molding machine (Nippon Steel) was produced from two types of pellets (Example 1 and Example 2) molded by the above molding method with different material compositions and pellets (Comparative Example) molded by the above conventional molding method. A test piece for measuring physical properties (compliant with JIS standard) is molded at a molding temperature of 200 ° C. (die temperature of 60 ° C.) using JSW J200A), and an evaluation test (bending test, impact test) for each test piece. Went.

In Example 1, a long fiber nonwoven fabric (fiber diameter 25 μm, basis weight 40 g / m ² ) made of polypropylene resin fibers is used as a sheet-like member, and bamboo fiber is used as a reinforcing material, and Wf = 65%. Example 2 is a non-woven fabric (polypropylene: polyethylene terephthalate = 7) that is composed of a composite fiber in which polyethylene terephthalate as a high melting point resin is arranged in the core and polypropylene as a low melting point resin is arranged in the sheath as a sheet-like member. : 3 <weight ratio>, fiber diameter 25 μm, basis weight 40 g / m ² ). Other matters were prepared in accordance with Example 1. Moreover, the comparative example used the pellet-shaped polypropylene as a base material, and the bamboo fiber as a reinforcing material, and used the pellet shape | molded with the biaxial kneading extruder.

  The test results are shown in FIG. As shown in FIG. 6, according to the pellets molded by the method of the present invention, the bending property is better than that of the conventional pellets, and the high melting point resin is melted by using a sheet-like member in which the high melting point resin is fibrous. It was found that by molding at a molding temperature that does not, this high melting point resin acts as a reinforcing material and the impact strength is improved.

It is a perspective view which shows the manufacturing process of the resin composition by this invention method, (a) A figure is a dispersion | distribution process of the reinforcing material on a sheet-like member, (b) A figure is the state after dispersion | distribution of a reinforcing material, (c The figure shows the composites after being rolled up. It is sectional drawing which shows schematic structure of an extrusion molding machine. It is a perspective view which shows other embodiment of this invention, (a) A figure shows the spreading | diffusion process of the reinforcing material on a sheet-like member, (b) A figure shows the composite_body | complex after joining, respectively. It is a figure which shows the result of having measured the content rate Wf of the bamboo fiber in the pellet shape | molded by the conventional method and this invention method. It is a figure which shows the result of having measured the bamboo fiber length in the pellet shape | molded by the conventional method and the method of this invention. It is a figure which shows the result of the bending test of the secondary molded object of the pellet shape | molded by the conventional method and this invention method, and an impact test.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sheet-like member 1a Bending part 1b Both sides 2 Bamboo fiber (reinforcing material)
3 Composite 4 Extruder 4a Hopper 4b Screw 4c Heating unit 4d Cylinder 4e Drive device 4f Die 5 Housing part Wf Content

Claims (3)

When manufacturing a resin composition in which a reinforcing material is blended with a thermoplastic resin as a base material,
Forming a composite body in which a reinforcing material is held inside by a sheet-like member made of the thermoplastic resin, supplying the composite body to an extruder, and molding , and
A resin composition in which the composite body is formed by partitioning a housing portion for housing a reinforcing material with a sheet-like member, and the housing portion is formed by winding the sheet-like member into a roll shape . Manufacturing method. When manufacturing a resin composition in which a reinforcing material is blended with a thermoplastic resin as a base material,
Forming a composite material in which a reinforcing material is held inside by a sheet-like member made of the thermoplastic resin, supplying the composite material to an extruder, and molding, and
The composite body is formed by partitioning a housing portion for housing a reinforcing material with a sheet-like member, and the housing portion curves the sheet-like member and joins both sides of the curved portion. The manufacturing method of the resin composition which is formed . When manufacturing a resin composition in which a reinforcing material is blended with a thermoplastic resin as a base material,
Forming a composite material in which a reinforcing material is held inside by a sheet-like member made of the thermoplastic resin, supplying the composite material to an extruder, and molding, and
The composite body is formed by partitioning a storage portion for storing a reinforcing material with a sheet-like member, and the storage portion overlaps two sheet-like members and joins the sheet-like members on both sides thereof. The manufacturing method of the resin composition which is formed by doing .

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