JP2012102161A - Method for producing pulp fiber reinforced resin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the following problem: pulp fiber composite PP (polypropylene) to which a flat filler has been added so as to achieve a high flexural modulus remarkably deteriorates designability because air remaining among fibrillated fine fibers on fiber surfaces separates during injection molding and remains as bubbles in a molded article, and in order to prevent the deterioration, a means of imparting a dilute solution of an elastomer or the like to pulp fibers, followed by adhesion by squeezing may be adopted, however, this means brings reduction of impact strength.SOLUTION: A method for producing a pulp fiber reinforced resin is characterized in that a surfactant is sprayed and impregnated into aggregated pulp fibers under convection in a stirring tank; a dilute solution of a low elastic elastomer dispersed in water with a surfactant is sprayed; a flat inorganic material is put while the pulp fibers are in the wet state; and a filler formed by defiberizing the pulp fibers and dispersing the above filler is kneaded with a thermoplastic resin and made composite.

Description

  The present invention relates to a composite of a thermoplastic resin using a filler mainly composed of pulp fibers obtained by defibrating recovered waste paper, etc., and alleviates deterioration in designability and increase in brittleness, as well as bending stress. The present invention relates to a method for producing a pulp fiber reinforced resin that improves the toughness of the resin.

  Obtained by pulverizing recovered paper into fibers for the purpose of reducing the amount of general-purpose resins such as PP (polypropylene) as natural materials are used to reduce carbon dioxide emissions and effectively use resources. Means for achieving the above-mentioned object by incorporating pulp fibers are drawing attention.

  For example, there has been proposed a means for melt-mixing a composite of pulp fibers with a mixture of defibrated waste paper obtained by pulverization and PP (polypropylene) (see, for example, Patent Document 1).

  Further, in order to facilitate handling of bulky plant fibers, PP (polypropylene) is used with a lump or pellet in a state that can promote the dispersion of plant fibers using a plasticizer or cellulose hydrophobizing agent having a melting point of 200 ° C. or lower. Means for improving dispersibility in a resin by kneading have been proposed (see, for example, Patent Document 2).

  However, fine fibers that are partially fibrillated on the surface of the pulp fiber have the effect of promoting the entanglement associated with the mixing of the pulp fiber and the resin, so that the fiber and the resin have a strong direct bond. It is difficult to obtain a composite mode. As a result, PP (polypropylene) combined with pulp fibers is excellent in rigidity and heat resistance, but on the other hand, brittleness such as reduction in impact strength and tensile elongation is increased, and the improvement effect of the composite is impaired. . Furthermore, the air between the fine fibers is likely to remain, and is not easily discharged by simple kneading, but is separated in a flow process under high pressure such as injection molding, and remains in the molded product as bubbles to deteriorate the design. It has a problem.

  In order to solve this problem, as a means for coating the surface of the pulp fiber with a resin which is a matrix after coating the fiber surface by spraying in a liquid state in which an olefin-based thermoplastic resin is dispersed in a solvent, etc. Means for improving mechanical strength by mixing and integrating have been proposed (see, for example, Patent Document 3).

  In addition, a means for preventing whitening has been proposed by using the fibrillated fiber to fix the fibrillated fiber to the fiber body by attaching the elastic resin solution to the fibrillated fiber surface and then attaching it to the fiber body. (For example, see Patent Document 4).

  In addition, the thermoplastic resin compounded with pulp fibers obtained by defibrating the recovered paper has a significant decrease in fluidity at the time of injection molding, so it is necessary to suppress deformation due to bending stress such as a fan. It was difficult to apply to parts.

  On the other hand, as a means for improving the elastic modulus capable of injection molding, a long fiber reinforced composite resin composition with an olefin resin in which organic tal fiber is combined with talc of a flat inorganic filler has been proposed (for example, , See Patent Document 5).

JP 05-320367 A Japanese Patent Application Laid-Open No. 06-073231 Japanese Patent Laid-Open No. 08-020021 JP 09-228250 A JP 2009-13330 A Japanese Patent Laid-Open No. 11-5203 JP 2003-169978 A JP 08-252557 A

  According to these means, in order to prevent the air remaining in the gap formed by the fibrillated fine fibers on the fiber surface from moving to the surface of the resin molded product and causing whitening, the resin solution enters the pulp. Achieve integration of fiber and matrix resin. However, an increase in brittleness associated with this modification promotes an increase in strength and elastic modulus, but on the other hand, the impact strength is greatly reduced.

  However, since the fibrous filler of pulp is extremely easy to aggregate and cannot be easily defibrated by melt kneading with a resin using an extruder or the like, the air in the voids between the fibers is discharged and dispersed. On the surface of a molded product obtained by injection molding using a composite pellet, there remains a problem that streaky whitening is scattered in the flow direction due to bubbles due to residual air.

  Similarly, even when a flat filler that contributes to an improvement in the flexural modulus such as talc is added to the fibrous filler of pulp that is prone to agglomeration, uniform dispersion is achieved in the composite by melt-kneading with a thermoplastic resin. Is difficult.

  The present invention has been made to solve the above-described problems. An aqueous dispersion of an adhesive low-molecular-weight olefin elastomer is held together with a surfactant on the surface of a pulp fiber, so that the fine fiber is interposed between fine fibers. Manufacture of pulp fiber reinforced resin that eliminates residual air and obtains a buffering action of low molecular weight olefin elastomer rich in viscosity, and can achieve a composite that achieves whitening formation on the surface of molded products and suppression of reduction in impact strength Provide a method.

  The method for producing a pulp fiber reinforced resin according to the present invention is a low elastic elastomer in which a surfactant is sprayed and impregnated in a convection state in a stirring tank and then dispersed in water using the surfactant. Sprayed with a dilute liquid, and a flat inorganic material is added in a state in which the pulp fiber is kept in a wet state, and a filler made by dispersing the pulp fiber defibration and the filler is kneaded with the thermoplastic resin. It is characterized by being compounded.

  In the method for producing a pulp fiber reinforced resin according to the present invention, an aqueous dispersion of an adhesive low molecular weight olefin elastomer is held together with a surfactant on the surface of the pulp fiber, so that the air remaining between the fine fibers is removed. Since it eliminates and acts as a buffer for the low-molecular-weight olefin elastomer rich in viscosity, a composite that achieves whitening formation on the surface of the molded article and suppression of reduction in impact strength can be obtained.

The figure which shows Embodiment 1 and is a figure which shows the result of having measured the general physical property using the test piece which injection-molded PP (polypropylene) compounded with the pulp fiber as a molding material.

Embodiment 1 FIG.
<Overview>
Pulp fibers obtained by defibrating recovered paper or the like can be combined with a thermoplastic resin by melt-kneading, thereby reducing the amount of carbon dioxide emission associated with the production of the molding material. In addition, the present invention imparts great effectiveness to the properties of molded products, such as improvement of various physical properties including impact strength according to the fiber length. On the other hand, the application to the molding resin has a problem that since the fiber surface is provided with fine fibers that are partially fibrillated, they are easily entangled with each other.

  This means that even when subjected to shear stress in melt-kneading to obtain a molding material, the fibers cannot be dispersed in a cotton-like state and cannot be dispersed in the resulting composite resin. Create challenges. Furthermore, since the air remaining between the fine fibers of the fibers cannot be sufficiently eliminated, the fine bubbles are separated when flowing under high pressure in the mold during injection molding to be molded into the molded product, and the molded product is partially Cause whitening to cause deterioration of the design.

  When a flat filler such as mica fine powder or talc, which is a flaky reinforcing material, is added to improve rigidity against bending stress in an uneven dispersion state of pulp fibers, these fillers are not uniformly dispersed. In addition, the reinforcing effect due to the interaction with the pulp fibers cannot be sufficiently exhibited.

  The present invention relates to a means for ensuring that a long fiber having fine fibers on its surface is not easily entangled with each other and a uniform dispersion state together with a flat filler such as mica, and is a flat fine powder such as talc or mica. The present invention relates to a forming raw material adjusting means characterized in that the particles are held on the pulp fiber surface to inhibit the entanglement to suppress the aggregation of the pulp long fibers and to uniformly disperse these fillers in the composite resin.

<Prior art>
According to Patent Document 3 (Japanese Patent Laid-Open No. 08-020021), the means for coating the surface of the pulp fiber with resin is coated on the fiber surface by spraying it in a liquid state in which an olefin-based thermoplastic resin is dispersed in a solvent. There is an example of improving the mechanical strength by making it.

  Patent Document 4 (Japanese Patent Application Laid-Open No. 09-228250) describes means for preventing whitening by using an elastic resin solution that has been squeezed and adhered to a fibrillated fiber surface. ing.

  Regarding a composite with pulp fiber, Patent Document 1 (Japanese Patent Laid-Open No. 05-320367) introduced a means for melting and mixing a mixture of defibrated waste paper obtained by pulverization and PP (polypropylene). ing.

  Further, in Patent Document 2 (Japanese Patent Application Laid-Open No. 06-073231), a plasticizer or cellulose hydrophobizing agent having a melting point of 200 ° C. or lower is used to knead plant fiber dispersion with PP (polypropylene). Discloses means for improving dispersibility.

  On the other hand, the prior literature relating to the resin composite of pulp fiber uses a molding material in which a waste paper raw material is dry defibrated and an adhesive is added after adding a thermoplastic resin to Patent Document 6 (Japanese Patent Laid-Open No. 11-5203). Means for performing heat and pressure molding at a predetermined temperature are introduced.

  Patent Document 7 (Japanese Patent Application Laid-Open No. 2003-169978) discloses a method for manufacturing a cushion material in which a binder liquid is sprayed onto the surface of a spherical cotton that has floated by stirring.

  Further, Patent Document 8 (Japanese Patent Laid-Open No. 08-252557) discloses a means for producing a used paper board by uniformly mixing used paper pulp and thermoplastic fine fibers before heat treatment.

<Differences from the prior art>
The present invention uses a dilute solution of a surfactant having both a hydrophobic group and a hydrophilic group in order to facilitate the removal of air in the space of the fibrillated fine fiber on the surface of the pulp fiber. It is excellent in viscosity dispersed in dilute solution due to the action of hydrophobic group which has excellent affinity with resin after easily impregnating with surfactant with hydrophilic group with excellent affinity and ensuring the fiber body converged Elastomer can be firmly coated.

  On the other hand, by coating the surface portion with a resin having excellent viscosity, they are integrated with each other by kneading with PP (polypropylene), thereby increasing the buffering effect at the interface portion between the two materials and contributing to the improvement of the impact strength.

  In addition, in the formation of a composite of pulp fiber and resin, there is no description in the prior art document regarding means for preventing re-aggregation after releasing the fiber from the agglomerated state, leading to capturing the technical features of the present invention. Absent.

<Effect (Inventive step)>
By removing fine particles of olefin-based elastomer (PIB (polyisobutylene)), which has excellent compatibility with PP (polypropylene), on the surface of the long-fiber pulp, the air contained between the fine fibers on the surface is eliminated. Since flat fillers such as mica and talc are held, the fibers are uniformly dispersed by suppressing the entanglement between the fibers, which promotes the improvement of strength and suppresses whitening caused by the discharge of bubbles during injection molding. Designability can be improved.

  In addition, PIB (polyisobutylene), which has a low melting point and is rich in viscosity, is provided on the fiber surface, so that in addition to improving fluidity during molding and strengthening the composite of PP (polypropylene) and pulp fibers, it is accompanied by stress load. The strength due to the elimination of residual bubbles that became the starting point of fracture, particularly the impact strength due to the addition of inorganic filler due to the addition of viscosity to the interface, was suppressed.

  A method for producing a composite resin obtained by kneading PP (polypropylene) with a filler using mica in combination with a modified pulp fiber by applying a diluted aqueous dispersion of PIB (polyisobutylene) will be described in detail below.

  First, PIB (polyisobutylene), which is a low-elastic elastomer, was dispersed at a high temperature in water equipped with a surfactant until it became an emulsion (emulsified and dispersed in water). However, those having a molecular weight of 100K (K means x1000, 100K = 100000, and the same shall apply hereinafter) or more are reduced in viscosity by swelling or dissolving using a solvent to facilitate dispersion. It is preferable. On the other hand, those having a temperature of 120K or more are not suitable because only a concentration required for dispersion of 5% or less is obtained.

  On the other hand, for the pulp fiber, select paper that does not have residual chemicals that promote discoloration or deterioration such as acid or chlorine, and put it in the gap provided between the two opposing disks rotating in different directions. Use a fiber that has been defibrated by applying shearing force.

  For the modification of the pulp fiber, a dilute aqueous solution of a surfactant is sprayed in the form of a mist while the pulp fiber is suspended in a mixer equipped with a blade rotating at high speed, such as a Henschel mixer. The amount of the surfactant to be added is preferably 0.5 to 2.0% with respect to the pulp fiber, and the aqueous solution to be sprayed is preferably the same amount to double the amount of the pulp fiber.

  The surfactant to be used is characterized by having both a hydrophilic group mainly composed of ethylene oxide and a hydrophobic group composed of a linear alkyl group, and the affinity between hydrophobic PP (polypropylene) and hydrophilic pulp fiber. The affinity between the surfactant and PIB (polyisobutylene) added thereafter can be promoted.

  Next, a dilute aqueous dispersion of PIB (polyisobutylene) is sprayed while maintaining a state in which the wet pulp fiber containing the surfactant aqueous solution floats in the mixer. PIB (polyisobutylene) is in an extremely fine particle form and is uniformly dispersed in water, and penetration between fibers is facilitated due to excellent affinity with the surfactant contained in the pulp fiber. The PIB (polyisobutylene) used here is a 5 wt% dilute dispersion having a molecular weight of about 80K that exhibits high tackiness at room temperature, and sprayed so that 2.5 parts are coated on 100 parts of pulp fibers. It was.

  If the PIB (polyisobutylene) aqueous dispersion is added directly without spraying, a homogeneous coating state cannot be obtained, and an excessively wet state is partially formed, and this portion is formed on the surface of the pulp fiber. Since the provided fine fibers converge, there is a problem that a sufficient strength improvement effect cannot be obtained.

  When an excessively wet state is formed by applying the above-described PIB (polyisobutylene) to the pulp fibers, the pulp fibers are less likely to float in the mixer, and the PIB (polyisobutylene) that has continued to adhere to the wall surface continues to be uniform. Fall into a state of inhibiting proper application. When this is predicted, it is preferable to stop spraying each raw material and to inject dry air into the mixer to promote drying of the pulp fibers.

  Next, mica (flat inorganic substance) powder is added to the pulp fiber that has been subjected to the above-described treatment, and mixed in the same manner. The addition of mica powder is achieved by continuing the surface treatment by applying PIB (polyisobutylene) to the above-described pulp fibers and adding a predetermined amount. In the mixer, the pulp fibers are maintained in a defibrated state without being agglomerated by shearing force received from blades rotating at high speed. Under this state, the mica powder is charged, and the stirring is stopped when a state where both the materials are suspended in the air and uniform mixing is obtained is obtained.

  The PP (polypropylene) powder used here is a low-viscosity powder in consideration of a decrease in fluidity during injection molding due to compounding with pulp fibers. In this embodiment, an MI (melt flow index) of 40 g / 10 min is selected, and pulp fibers having a fiber length of 1.0 mm and 2.5 mm are used at the time of melt-kneading, respectively, and applied to PIB (polyethylene). The addition amount of isobutylene) is a moderately remaining coating amount that does not elute excessively, the pulp fiber content is 30 wt% so as to suppress loss of fluidity, and mica powder contributes to the improvement of the flexural modulus. 20 wt% is added.

  Due to staying in the uniformly mixed state in the lower part of the stirrer tank by stopping the stirring, the mica powder in contact with the pulp fibers is held via PIB (polyisobutylene) having excellent adhesiveness so as to cover the fiber surface. Thus, the mixture was able to be handled as a powder fluid in which aggregation of pulp fibers was suppressed.

  The above mixture, which has been obtained with the above characteristics of powder fluid and can be continuously charged, was melt-kneaded with PP (polypropylene) using an extruder. It is preferable to perform melt-kneading after adjusting the cylinder temperature of the extruder at this time so that the resin temperature does not exceed 190 ° C., preferably 180 ° C. The composite of PP (polypropylene) and pulp fiber after kneading was solidified by air cooling of the strand discharged from the extruder, and this was appropriately cut into pellets.

  Below, general physical properties (MI, bending strength, bending elastic modulus, impact strength, surface appearance) are obtained by using a test piece in which PP (polypropylene) compounded with pulp fiber and mica powder by the above-mentioned means is used as a molding material. The measurement results are shown in FIG.

  FIG. 1 is a diagram showing the first embodiment, and is a diagram showing results of measuring general physical properties using a test piece obtained by injection-molding PP (polypropylene) combined with pulp fibers as a molding material.

  As a comparative example that does not depend on the means of the present embodiment, Comparative Example 1-1 is a molding material in which mica powder is mixed after applying the surface activity to the pulp fiber, and melt-kneading and pelletizing by an extruder, Comparative Example 1-2 is a molding material in which mica powder is directly mixed with pulp fibers in an unprocessed and agglomerated state, and then melt-kneaded and pelletized using an extruder, and various test pieces obtained by injection molding are used. The physical properties are also shown.

  In the pulp fiber composite PP (polypropylene) according to the present embodiment, PIB (polyisobutylene) is retained between the fine fibers on the surface of the pulp fiber, so that the fluidity is lower than that not retaining PIB (polyisobutylene). (MI), impact resistance and surface design are significantly superior. The pulp fiber impregnated with only the surfactant is dispersed in a state where it is kept wet with the mica powder and shear force received by the blades rotating at high speed in the stirrer tank, and at the time of melt kneading in the extruder When PIB (polyisobutylene) held by the fiber is melted and kneaded prior to PP (polypropylene), the air between the fibers is easily removed and is eliminated by the high pressure received in the mold during injection molding. There will be no whitening.

  In contrast, the pulp fiber impregnated with only the surfactant without retaining PIB (polyisobutylene) (Comparative Example 1-1) was fast in a stirrer together with PP (polypropylene) powder in a wet state. While dispersion occurs due to the shearing force received by the rotating blades, PIB (polyisobutylene) is not held on the surface, so the air between fibers cannot be sufficiently eliminated during melt-kneading by the extruder, and the inside of the mold during injection molding It is discharged by the high pressure received at, and will be visually recognized as whitening.

  On the other hand, pellets obtained by melt-kneading with an extruder after stirring and mixing with PP (polypropylene) rotated at high speed in a tank of a stirrer without performing a treatment using a surfactant and PIB (polyisobutylene) In the case of (Comparative Example 1-2), the pulp fiber cannot be completely excluded even if it receives a high shearing force that is received when the PP (polypropylene) melts the air retained between the pulp fiber. As a result, fine bubbles are discharged during the injection flow under high pressure received in the mold during injection molding, and this is the part where the pulp fibers are aggregated on the surface of the molded product, and the whitening of about 0.1 to 3 mm The spots were visible on the surface of the molded product.

  In addition, any test piece that does not contain a surfactant and PIB (polyisobutylene) absorbs impact stress without receiving a buffering action due to the high viscosity of PIB (polyisobutylene) attached to the surface of the pulp fiber. Therefore, it is easy to break, and the impact strength is significantly reduced. At the same time, the mica powder cannot be held in the pulp fiber, and the mica powder is not sufficiently dispersed in the composite resin due to non-uniform charging into the extruder. In particular, Comparative Example 1-2 in which no surfactant was used was in a state in which the pulp fibers were aggregated without being defibrated, and as a result, the stress was not sufficiently dispersed. The decrease was significant.

  From this, the pulp fiber strengthening means according to the present embodiment obtained the pellets obtained from which the remaining pellets were prevented from remaining air in the pulp fibers, and superior dispersibility was obtained compared to the comparative example. In connection with that, since it was not hold | maintained between the fibers accompanying fiber aggregation, generation | occurrence | production of whitening was able to be suppressed. It was also confirmed that high impact strength was exhibited in response to impact absorption due to high viscosity of PIB (polyisobutylene) and an excellent dispersion state of the filler.

  The method for producing a pulp fiber reinforced resin according to the embodiment of the present invention prevents the air remaining in the gap formed by the fine fibers on the fiber surface from moving to the surface of the resin molded product and causing whitening. After agglomerated pulp fibers are put into a stirring tank equipped with rotating blades and defibrated, they are impregnated with a surfactant coexisting hydrophilic and hydrophobic functional groups with excellent affinity for pulp fibers. After that, a dilute aqueous dispersion in which fine particles of olefin-based elastomer having excellent viscosity and tackiness are dispersed in water in the presence of the surfactant is attached, and a flat surface is formed on the tacky surface. Mica and talc fillers are introduced.

  In this state, the aggregated pulp fibers are defibrated by receiving a shearing force caused by the collision with the flat filler, and a state where the fibers are uniformly dispersed can be secured. When the rotation of the stirrer is stopped and left at the bottom of the tank, the filler adheres due to the adhesive force of PIB (polyisobutylene) applied to the surface of the pulp fiber, so that the pulp fiber agglomerates again. Can be suppressed.

  Thereby, aggregation of pulp fibers by fine fibers is inhibited by blades rotating at high speed. Therefore, the pulp fiber which gave the said process obtained the stable dispersion | distribution state using the extruder etc. with thermoplastic resins, such as PP (polypropylene), and knead | mixed in the 160-190 degreeC molten state.

  The pulp fiber reinforced resin production method according to the embodiment of the present invention is a mixture of pulp fiber and flat inorganic material coated with PIB (polyisobutylene) mixed in a floating state in a tank of a mixer. Since the flat inorganic material is held via PIB (polyisobutylene) on the fine fibers provided in the pulp fibers, the pulp fibers do not exhibit agglomeration due to the fine fibers, so that they are easy to handle and complex. Excellent dispersibility in resin.

  The pulp fiber exhibits excellent dispersibility in the compounding with the thermoplastic resin, resulting in various strength improvement effects, especially the brittleness associated with the compounding due to the adhesion of a highly viscous elastomer to the pulp fiber surface. It was possible to suppress a decrease in impact strength accompanying the improvement.

  In addition, since the olefin-based elastomer is adhered between the fine fibers and between the surfaces, PIB (polyisobutylene) is added to the thermoplastic resin when a pellet is produced by melt-kneading with a thermoplastic resin such as PP (polypropylene). It is possible to prevent the air from being easily discharged and remaining in the pellets prior to melting, and to suppress the occurrence of whitening occurring on the surface of the molded product due to the discharge due to the high pressure of injection molding.

As a comparative example that does not depend on the means of the present embodiment, Comparative Example 1 is a molding material in which mica powder is mixed only after the surface activity is applied to pulp fibers, and melt-kneaded and pelletized by an extruder, Comparative Example 2 is a molding material in which mica powder is directly mixed with pulp fibers in an unprocessed and agglomerated state, and then melt-kneaded and pelletized using an extruder, and each physical property of a test piece obtained by injection molding is also shown. .

In contrast, pulp fiber (Comparative Example 1 ) impregnated with only a surfactant without retaining PIB (polyisobutylene) rotates at high speed in a stirrer together with PP (polypropylene) powder in a wet state. While dispersion is caused by the shearing force received by the blades, PIB (polyisobutylene) is not held on the surface, so air between fibers cannot be sufficiently eliminated during melt-kneading by an extruder and is received in the mold during injection molding. It is discharged at a high pressure and will be visually recognized as whitening.

On the other hand, pellets obtained by melt-kneading with an extruder after stirring and mixing with PP (polypropylene) rotated at high speed in a tank of a stirrer without performing a treatment using a surfactant and PIB (polyisobutylene) In the case of (Comparative Example 2 ), the pulp fiber cannot be completely eliminated even if it receives a high shear force that is received when the PP (polypropylene) melts the air retained between the pulp fiber. As a result, fine bubbles are discharged during the injection flow under high pressure received in the mold during injection molding, and this is the part where the pulp fibers are aggregated on the surface of the molded product, and the whitening of about 0.1 to 3 mm The spots were visible on the surface of the molded product.

In addition, any test piece that does not contain a surfactant and PIB (polyisobutylene) absorbs impact stress without receiving a buffering action due to the high viscosity of PIB (polyisobutylene) attached to the surface of the pulp fiber. Therefore, it is easy to break, and the impact strength is significantly reduced. At the same time, the mica powder cannot be held in the pulp fiber, and the mica powder is not sufficiently dispersed in the composite resin due to non-uniform charging into the extruder .

Claims (4)

  After the impregnated pulp fiber is sprayed and impregnated in a convection state in the stirring tank, the pulp fiber is impregnated and then sprayed with a dilute liquid of low elastic elastomer dispersed in water using the surfactant. The filler is formed by adding a flat inorganic substance while maintaining a wet state, and dispersing the pulp fiber and dispersing the filler, and kneading with a thermoplastic resin to form a composite. A method for producing a pulp fiber reinforced resin.   The method for producing a pulp fiber reinforced resin according to claim 1, wherein the low elastic elastomer is polyisobutylene having a molecular weight of 120K or less.   The low-elastic elastomer is dispersed in water using the surfactant having both a hydrophilic group mainly composed of ethylene oxide and a hydrophobic group composed of a linear alkyl group. Manufacturing method of pulp fiber reinforced resin.   The method for producing a pulp fiber reinforced resin according to claim 1, wherein the flat inorganic substance is mica.

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