JP2016191021A - Substrate for composite molding, composite molded body and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a composite molded body capable of being provided as an environmentally compatible product when using a cellulose fiber as a reinforced resin and a thermoplastic resin as a matrix.SOLUTION: There is provided a composite molded body containing a cellulose-based fiber as a reinforced fiber by manufacturing a fiber sheet containing at least a recycled cellulose fiber, a fiber containing polycarbonate as a thermoplastic resin fiber and a fiber containing polylactic acid as a substrate for composite molding and heating the substrate for composite molding at a temperature for melting or softening the thermoplastic resin fiber, and matrix contains at least polycarbonate and polylactic acid.SELECTED DRAWING: None

Description

  The present invention relates to a base material used for producing a fiber-reinforced composite molded body reinforced with regenerated cellulose fibers and whose matrix component is a thermoplastic resin, and composite molding reinforced with regenerated cellulose fibers and whose matrix component is a thermoplastic resin. The present invention relates to a body and a manufacturing method thereof.

  A composite molded article containing carbon fiber or glass fiber as a reinforcing fiber and having a thermosetting resin such as an epoxy resin as a matrix component has excellent mechanical properties and is lightweight, so it is widely used in various applications. It is used. As another type of composite molded body, a composite molded body in which the reinforcing fiber is a cellulosic fiber and the matrix component is a thermoplastic resin has also been proposed. Cellulosic fiber / thermoplastic composite composites are inferior in mechanical properties to carbon fiber (or glass fiber) / thermosetting resin composites, but 1) the matrix component is a thermoplastic resin. Therefore, the production time can be shortened. 2) Since the reinforcing fiber is naturally derived, there is an advantage that a product including this can be proposed as a product considering the environment.

  As a composite molded article of cellulosic fiber / thermoplastic resin, for example, Patent Document 1 includes a cloth having one or more types of cellulose fibers and one or more types of thermoplastic resin fibers as constituent materials. A composite molded body formed by laminating at least one layer or two or more layers and molding at least a glass transition temperature or a melting temperature of at least one thermoplastic resin fiber in the thermoplastic resin fiber, and having a predetermined linear expansion A composite molded body having a coefficient has been proposed. Patent Document 2 describes that a composite material is produced by distributing cellulose-based artificial fibers having an average diameter of 5 to 20 μm and a number-weighted average length of 200 to 800 μm in a thermoplastic polymer. .

JP 2014-95049 A Special table 2013-503980 gazette

  Due to the growing interest in environmental protection, there is a demand for products that are more environmentally friendly for composite molded bodies. An object of the present invention is to obtain a composite molded body that can be proposed as an environment-friendly product by using not only reinforcing fibers but also a matrix component made of an environment-friendly material.

In one aspect, the present invention provides a composite molding substrate containing regenerated cellulose fibers and a thermoplastic resin, wherein the thermoplastic resin contains at least polycarbonate and polylactic acid.
In another aspect, the present invention provides a composite molded body in which regenerated cellulose fibers are included as reinforcing fibers and a thermoplastic resin is included as a matrix, and the composite resin includes at least polycarbonate and polylactic acid as the thermoplastic resin. I will provide a.
In yet another aspect, the present invention provides:
Producing a regenerated cellulose fiber and a composite molding substrate containing at least polycarbonate and polylactic acid as a thermoplastic resin; and setting the composite molding substrate to a temperature at which at least a part of the polycarbonate and polylactic acid melts or softens. And a method for producing a composite molded body, which comprises heating.

  The composite molding substrate of the present invention includes not only a regenerated cellulose fiber that can be produced from a plant-derived raw material as a reinforcing fiber, but also a polylactic acid that can be produced from a plant-derived raw material as a matrix component. Include as part. Therefore, the base material for composite molding of the present invention has a higher proportion of plant-derived raw materials in the whole, and can provide a composite molded body that can be provided as a product considering the environment. Further, the composite molding substrate of the present invention contains polycarbonate, and since polycarbonate has high affinity with polylactic acid and has high mechanical strength itself, the composite molded body when combined with polylactic acid is used. Ensure good mechanical strength. Furthermore, polycarbonate and polylactic acid have high affinity with the regenerated cellulose fiber, which also contributes to the improvement of the mechanical strength of the composite molded body. Therefore, the composite molded body obtained from the base material can be provided for various products.

(Background to the present invention)
As described above, in order to provide a composite molded body that is more environmentally friendly, it is desirable to use not only the reinforcing fibers but also the raw materials derived from organisms such as plants (biomass raw materials) as matrix components. Polylactic acid is widely known as a resin produced from biomass, and products using this are already commercially available. Therefore, the present inventors have studied to increase the proportion of the biomass raw material in the composite molded body by using at least a part of the matrix component as polylactic acid.

  Since polylactic acid has a lower mechanical strength than petroleum-based plastics that are widely used, it is inevitable that the mechanical strength of the composite molded body is reduced to some extent when it is used. As a result of intensive studies, the present inventors have found that when polylactic acid is used as a matrix component in combination with polycarbonate, a decrease in strength is relatively suppressed, and a practical product can be obtained as a composite molded body. . Since both polylactic acid and polycarbonate are thermoplastic resins that can be made into fibers, if fibers containing these resins and regenerated cellulose fibers are used, an intermediate material sheet for producing a composite molded body is produced. can do. Furthermore, according to such a sheet, the present inventors can easily obtain a composite molded body having a form in which the matrix partially has a fiber shape by utilizing the difference in thermal behavior between polylactic acid and polycarbonate. I found out. The knowledge obtained by the present inventors will be described below.

  Hereinafter, the reinforcing fiber, the thermoplastic resin, and the like constituting the composite molding substrate and composite molded body of the present invention will be described. Here, the “base material for composite molding” is a raw material for producing a composite molded body, and by applying heat and pressure, its mechanical properties and / or shape change, and the composite molded body Points to something that gives Examples of the composite molding substrate include a fiber sheet comprising regenerated cellulose fibers and thermoplastic resin fibers, and pellets in which the regenerated cellulose fibers are contained in the thermoplastic resin.

(Regenerated cellulose fiber)
In the composite molding substrate and the composite molded article of the present invention, regenerated cellulose fibers are included as reinforcing fibers. Regenerated cellulose fiber refers to a fiber obtained by a method in which natural cellulose is treated with a chemical and dissolved and then formed into a fiber shape. Regenerated cellulose fibers are preferably used because they are produced from biomass raw materials and can be easily obtained as having a certain fineness and fiber length. Specifically, viscose rayon, polynosic, copper ammonia rayon (including those sold under the trade name “Cupura”), acetate, solvent-spun cellulose fibers (trade names “Tencel” and “Lyocell”) And the like) are examples of regenerated cellulose fibers. In addition to being readily available, viscose rayon has fine wrinkled irregularities on the peripheral surface of the fiber, a large contact area with the thermoplastic resin, and high interfacial strength with the thermoplastic resin. Since it is easy to show, it is preferably used in the present invention. However, since the mechanical properties (tensile strength, bending strength, etc.) of the composite molded body tend to improve as the single fiber strength of the reinforcing fiber increases, polynosic and solvent-spun cellulose are preferred in terms of the reinforcing effect. Fiber is also preferably used.

  The fineness of the regenerated cellulose fiber used in the present invention is not particularly limited, and may be, for example, from 0.1 dtex to 20 dtex, preferably from 0.5 dtex to 10 dtex, more preferably from 0.6 dtex to Has a fineness of 8 dtex. The smaller the fineness of the reinforcing fiber, the more reinforcing fibers are present in the composite molded body when fibers of the same mass are included in the composite molded body, that is, the number of reinforcing fibers included in the composite molded body is greater. The reinforcement effect becomes larger. However, it is difficult to obtain regenerated cellulose fibers having a fineness of less than 0.1 dtex. Moreover, since such a thin regenerated cellulose fiber is difficult to handle, when producing a composite molded body by a method including producing a fiber sheet together with a thermoplastic resin fiber, the production efficiency of the composite molded body is lowered. In the present invention, two or more types of regenerated cellulose fibers having different fineness may be used.

  The fiber length of the regenerated cellulose fiber used in the present invention is not particularly limited. For example, the fiber length may be 1 mm or more. The composite molded body may intentionally or inevitably contain a plurality of regenerated cellulose fibers having different fiber lengths. In one embodiment, all regenerated cellulose fibers have substantially the same fiber length. Since the finite-length regenerated cellulose fiber is produced by a method of spinning so as to have the same fiber length by a cutting machine, when using a regenerated cellulose fiber marketed as having a predetermined fiber length, The fibers having the same fiber length can be present in the composite molded body.

  The longer the fiber length of the reinforcing fiber, the better the reinforcing effect. Therefore, if the fiber length of the regenerated cellulose fiber is too short (for example, less than 1 mm), it is difficult to obtain a sufficient reinforcing effect. In particular, since a fiber having a fiber length of less than 1 mm is powdery, when a composite molded body is produced by a method including producing a fiber sheet together with a thermoplastic resin fiber, the regenerated cellulose fiber is dropped from the fiber sheet. Inconvenience may occur.

  When producing a composite molded body by a method including producing a fiber sheet as a composite molding base material from reinforcing fibers and thermoplastic resin fibers, the fiber length of the regenerated cellulose fiber depends on the form of the fiber sheet to be produced. Different. For example, when producing a card web and producing a fiber sheet in the form of a nonwoven fabric, the fiber length of the regenerated cellulose fiber is preferably 20 mm to 70 mm, more preferably 25 mm to 52 mm. When producing an air-laid web or a wet papermaking web to produce a fiber sheet in the form of a nonwoven fabric, the fiber length of the regenerated cellulose fiber is preferably 3 mm to 25 mm, more preferably 5 mm to 20 mm. Alternatively, the fiber sheet does not have to be composed of fibers of a finite length, and may be, for example, a long fiber nonwoven fabric such as a spunbond nonwoven fabric, or a filament yarn woven or knitted fabric.

  When the composite molding substrate is provided in the form of pellets, for example, regenerated cellulose fibers having a fiber length of 1 mm to 3 mm may be irregularly dispersed in the pellets. Alternatively, when the pellet is manufactured by a method in which a molten thermoplastic resin is impregnated into a bundle of reinforcing fibers, the resin is solidified to obtain a rod-like material, and then cut into a predetermined length, in the pellet The regenerated cellulose fiber is oriented in the length direction of the pellet and has a fiber length equal to the length of the pellet (usually 1 mm or more, for example, 2 mm to 15 mm).

  Regenerated cellulose fibers may be in the form of hollow fibers having cavities extending along the longitudinal direction of the fibers therein. When the regenerated cellulose fiber is a hollow fiber, a bubble part is present in the finally obtained composite molded body, and the heat insulating property and sound absorbing property of the composite molded body can be improved.

  The regenerated cellulose fiber may have a fiber cross-sectional shape that is flat and has a tape-like appearance. When the cross-sectional shape is flat, the interface strength between the regenerated cellulose fiber and the thermoplastic resin (matrix) tends to be high, and the mechanical properties of the composite molded body can be further improved.

  In the regenerated cellulose fiber, if necessary, one or more additives selected from components other than cellulose, for example, flame retardants, ultraviolet absorbers, charcoal, pigments, deodorants, antibacterial agents, minerals such as zeolite, etc. May be included. Depending on the type of the additive, the additive contained in the regenerated cellulose fiber may impart a predetermined function to the composite molded body or improve the function of the composite molded body. For example, when a regenerated cellulose fiber to which a flame retardant is added is used, the flame retardancy of the composite molded body can be improved.

(Thermoplastic resin)
The thermoplastic resin is a matrix in the composite molded body. The thermoplastic resin can be melted or softened by heating and processed into a desired shape in that state, and is solidified by cooling after processing. The time from the melting or softening of the thermoplastic resin to the solidification is shorter than the time required for the thermosetting resin to solidify (the time until the fluidity once becomes high and then hardens). Further, unlike a thermosetting resin, a thermoplastic resin can be remolded by applying heat after it has been once molded. Therefore, by using a thermoplastic resin as a matrix, a composite molded body can be produced with high production efficiency, and a composite molded body excellent in processability can be obtained.

  The base material for composite molding of the present invention and the composite molded body of the present invention contain at least polylactic acid and polycarbonate as the thermoplastic resin.

  It is known that polylactic acid can be produced from plant-derived raw materials. Polylactic acid can be produced using, for example, potato, corn, and sugarcane as raw materials. Polylactic acid generally has biodegradability regardless of its raw material. Therefore, the use of polylactic acid, in combination with the fact that the regenerated cellulose fiber is derived from plants, provides the composite molding substrate of the present invention and the composite molded body of the present invention as environmentally friendly products. Make it possible.

  Polylactic acid may be a known one. For example, polylactic acid is an L-form composed of L-lactic acid units, a D-form composed of D-lactic acid units, a mixture containing a polylactic acid stereocomplex formed by mixing L-forms and D-forms, or this mixture as a solid phase. It may be a polylactic acid block copolymer obtained by polymerization.

  Alternatively, in the present invention, polylactic acid is, for example, L-lactide and / or D-lactide starting from L-lactic acid and / or D-lactic acid, and oxyacids, lactones, and dicarboxylic acids copolymerizable therewith. Or a copolymer obtained by copolymerizing with a polyhydric alcohol (for example, caprolactone or glycolic acid).

  The molecular weight and molecular weight distribution of polylactic acid are not particularly limited, but the weight average molecular weight is 10,000 or more, preferably 50,000 or more. In particular, when obtaining a composite molding substrate by fiberizing polylactic acid, it is desirable to select one having a weight average molecular weight suitable for fiberization. Alternatively, the polylactic acid may have, for example, a value RV value measured with a B-type viscometer of 2.4 to 3.8.

  Polycarbonate is used to supplement the low mechanical strength of polylactic acid. Polycarbonate is particularly suitable for compensating the mechanical strength of polylactic acid. This is presumed to be due to the similarity between the carbonate bond contained in the polycarbonate and the ester bond contained in the polylactic acid, but the present invention is not limited thereby.

  The polycarbonate may be, for example, a polycarbonate having a number average molecular weight of 19000 or less, preferably 12500 to 15000 and a degree of branching in the range of 0.1 mol% to 0.8 mol%. Such a polycarbonate is suitable for fiberization, and is suitable for producing a sheet substrate for composite molding described later.

  The polycarbonate may be produced from a plant-derived raw material (sometimes referred to as biopolycarbonate). If such a polycarbonate is used, the entire composite molded body can be composed of plant-derived raw materials, and the composite molding substrate of the present invention and the composite molded body of the present invention are provided as environmentally friendly products. be able to.

  The polylactic acid and the polycarbonate are preferably contained in the composite molding substrate and the composite molded body so that the mass ratio is 80:20 to 20:80, and more preferably 70:30 to 30:70. When both are combined at a ratio within this range, it is possible to provide a composite molded body as an environment-friendly product while ensuring a certain degree of mechanical strength.

  The composite molding substrate and the composite molded body may contain a thermoplastic resin (also referred to as “third resin” for convenience) other than polylactic acid and polycarbonate. Examples of the third resin include polyester resins such as polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, polyethylene naphthalate, and polybutylene succinate; low density polyethylene, medium density polyethylene, high density polyethylene, linear low Polyethylene polymerized using ordinary Ziegler-Natta and metallocene catalysts, such as density polyethylene, and ultra-high molecular weight polyethylene, isotactic, atactic, polymerized using ordinary Ziegler-Natta and metallocene catalysts And various polyolefins such as polypropylene, polymethylpentene, polybutene-1, ethylene-vinyl alcohol copolymer, and ethylene-propylene copolymer such as syndiotactic; Down 6, nylon 66, nylon 11, and polyamide such as nylon 12; polyacetal, polystyrene, and engineering plastics such as cyclic polyolefin; and polyetherimides, and the like super engineering plastics such as polyimides. The third resin may be one obtained by modifying the resins listed above with an acid or the like, or may be a copolymer resin.

  The third resin may be one that can be produced from plant-derived raw materials. For example, a polyethylene called biopolyethylene and a polypropylene called biopolypropylene produced from sugarcane have been proposed. The use of a resin produced from such a plant-derived raw material makes it possible to provide the composite molded body as more environmentally friendly.

  When the third resin is used, the proportion of the third resin contained in the composite molding substrate and the thermoplastic resin of the composite molded body is preferably 30% by mass or less, more preferably 20% by mass or less. When the proportion of the third resin is too large, the proportion of polylactic acid and / or the proportion of polycarbonate decreases, and the appeal effect of consideration for the environment due to the use of polylactic acid may be reduced or sufficient. Mechanical strength may not be ensured.

  The thermoplastic resin may be in any form before it fixes the reinforcing fibers as a matrix. Therefore, the thermoplastic resin, for example, in the form of fibers, or in the form of pellets or powder may be melted or softened and then solidified to form a matrix of the composite molded body. .

  The thermoplastic resin contains one or more additives selected from flame retardants, pigments, hydrophilizing agents, antibacterial agents, antifungal agents, fillers, abrasives, lubricants, and the like as necessary. It's okay. When the additive is included, the proportion is preferably 30% or less of the total mass of the additive and the thermoplastic resin. Similar to the additive of the regenerated cellulose fiber, the additive added to the resin can also give a predetermined function to the composite molded body, or can improve the function of the composite molded body.

(Thermoplastic fiber)
The composite molding substrate of the present invention can be provided in the form of a fiber sheet containing a thermoplastic resin in the form of fibers (hereinafter also referred to as “composite molding sheet substrate” or “sheet substrate”). The thermoplastic resin fiber which comprises a sheet base material has the fineness and fiber length which were selected according to the form of the sheet base material so that it may mention later. The smaller the fineness of the thermoplastic resin fiber, the more easily the thermoplastic resin penetrates between the regenerated celluloses when it is melted or softened. On the other hand, fibers with a small fineness are poor in handleability and may reduce the production efficiency of spun yarn or nonwoven fabric. Therefore, the fineness of the thermoplastic resin fiber is appropriately determined in consideration of the permeability between the regenerated cellulose fibers and the ease of production of the sheet base material (including the ease of production of spun yarn used for the production of the sheet base material). Selected.

The thermoplastic resin fiber may be a composite fiber composed of two or more components. The composite form of the composite fiber is not particularly limited, and may be any of a core-sheath type, a side-by-side type, a split type in which two components are alternately arranged in a chrysanthemum shape, and a sea-island type. When a composite fiber is used, a matrix in which a thermoplastic resin is uniformly mixed can be obtained more easily in a composite molded body in which the matrix is composed of two or more thermoplastic resins.
Alternatively, the thermoplastic resin fiber may be a single fiber, a composite fiber, or a hollow fiber.

  The sheet base material of the present invention includes at least polycarbonate-containing fibers (hereinafter, simply referred to as “polycarbonate fibers”) and polylactic acid-containing fibers (hereinafter, also simply referred to as “polylactic acid fibers”) as thermoplastic resin fibers. included.

  When the polycarbonate fiber is a single fiber, the single fiber preferably contains 50% by weight or more, more preferably 60% by weight or more, even more preferably 70% by weight or more, most preferably substantially from polycarbonate resin. It becomes. Here, the term “substantially” usually means that the polycarbonate provided as a product usually contains additives such as stabilizers and / or various additives are added during the production of the fiber, so that only the polycarbonate is used. Therefore, it is used in consideration of the fact that a fiber having a form containing no other components cannot be obtained. Usually, the content of the additive is a maximum of 15% by mass. When the polycarbonate fiber is a single fiber and includes a thermoplastic resin other than polycarbonate, the thermoplastic resin corresponds to the third resin.

  When the polycarbonate fiber is a composite fiber of a component containing polycarbonate and another component, the component containing polycarbonate is preferably 50% by mass or more, more preferably 60% by mass or more, and even more preferably 70% by mass of polycarbonate. Most preferably, it consists essentially of a polycarbonate resin. The other thermoplastic resin contained in the component containing polycarbonate corresponds to the third resin. The other components of the composite fiber also correspond to the third resin. The other component may be made of, for example, one or more resins selected from the thermoplastic resins exemplified as the third resin in the above. In the case of a composite fiber, it is preferable to appropriately select a composite ratio, a composite form, and the like so that the ratio of the third resin is within the above preferable range.

  Specifically, the fineness of the polycarbonate fiber may be 0.5 dtex to 50 dtex, preferably 0.8 dtex to 20 dtex, more preferably 1 dtex to 10 dtex.

  When the polylactic acid fiber is a single fiber, the single fiber preferably contains 50% by mass or more of polylactic acid, more preferably 60% by mass or more, still more preferably 70% by mass or more, and most preferably from polylactic acid. It consists essentially of. Here, the meaning of the term “substantially” is as described in connection with the polycarbonate fiber. When the polylactic acid fiber is a single fiber and includes a thermoplastic resin other than polylactic acid, the thermoplastic resin corresponds to the third resin.

  When the polylactic acid fiber is a composite fiber of a component containing polylactic acid and other components, the component containing polylactic acid is preferably 50% by mass or more, more preferably 60% by mass or more, and even more preferably polylactic acid. Contains 70% by weight or more, and most preferably consists essentially of polylactic acid. The other thermoplastic resin contained in the component containing polylactic acid corresponds to the third resin. The other components of the composite fiber also correspond to the third resin. The other component may be made of, for example, one or more resins selected from the thermoplastic resins exemplified as the third resin in the above. In the case of a composite fiber, it is preferable to appropriately select a composite ratio, a composite form, and the like so that the ratio of the third resin is within the above preferable range.

  Specifically, the fineness of the polylactic acid fiber may be 0.5 dtex to 50 dtex, preferably 0.8 dtex to 20 dtex, more preferably 1 dtex to 50 dtex.

  The sheet base material may contain fibers made of other thermoplastic resins. The other thermoplastic resin corresponds to the third resin. The fiber made of the third resin may have a fineness of 0.5 dtex to 50 dtex.

  When a composite molded body is produced by a method including producing a fiber sheet as a composite molding base material from reinforcing fibers and thermoplastic resin fibers, the fiber length of the thermoplastic resin fibers depends on the form of the fiber sheet to be produced. Different. For example, when a card web is produced to produce a fiber sheet in the form of a nonwoven fabric, the fiber length of the thermoplastic resin fiber is preferably 30 mm to 70 mm, more preferably 40 mm to 60 mm. When producing an air laid web or a wet papermaking web to produce a fiber sheet in the form of a nonwoven fabric, the fiber length of the thermoplastic resin fiber is preferably 2 mm to 10 mm, more preferably 4 mm to 6 mm.

(Substrate for composite molding)
The base material for composite molding of the present invention includes the regenerated cellulose fiber described above and the thermoplastic resin described above. The composite molding substrate is provided as a fiber sheet when the thermoplastic resin is contained as a fiber. The base material in the form of a fiber sheet will be described later.

  The composite molding substrate may be in the form of pellets. The pellet is used as a raw material supplied to a molding machine for producing a composite molded body, and has, for example, a rectangular shape, a cubic shape, a meteorite shape, a cylindrical shape, or an elliptical column shape. As described above, in the pellets, the regenerated cellulose fibers may be dispersed randomly or may be oriented in a certain direction. The pellet can be produced by mixing a regenerated cellulose fiber and a non-fibrous thermoplastic resin by an ordinary pellet production method. Alternatively, as described above, the pellet can be manufactured by a method in which a molten thermoplastic resin is impregnated into a bundle of reinforcing fibers, the resin is solidified to obtain a rod-like material, and then cut into a predetermined length. it can.

(Sheet base material for composite molding)
The composite molding sheet base material of the present invention is a fiber sheet containing regenerated cellulose fibers and fibers made of a thermoplastic resin. When this sheet base material is heated, at least a part of the thermoplastic resin fibers is melted or softened, penetrates between the regenerated cellulose fibers, and then solidifies by cooling to form a matrix for fixing the fibers. The sheet base material includes at least polycarbonate fiber and polylactic acid fiber as thermoplastic resin fibers.

  The sheet substrate can be, for example, a woven fabric, a knitted fabric, or a non-woven fabric, or a combination thereof. Further, the sheet base material may be in the form of a laminate of a sheet made of thermoplastic resin fibers and a sheet made of regenerated cellulose fibers. In that case, the form of the laminated sheets may be the same and different from each other. It may be. For example, the sheet base material may be one in which a nonwoven fabric made of thermoplastic resin fibers is laminated and integrated on a woven fabric made of regenerated cellulose fibers.

  When the sheet base material is a woven fabric or a knitted fabric, the yarn constituting the woven fabric may be any of a blended yarn, a blended yarn, a core yarn, and a covered yarn composed of regenerated cellulose fibers and thermoplastic resin fibers. In the core yarn and the covered yarn, the core yarn may be a filament yarn made of long fibers of regenerated cellulose, and a short fiber of thermoplastic resin may be wound around the core yarn, or the core yarn may be made of long fibers of thermoplastic resin fiber. The filament yarn may be formed by winding short fibers of regenerated cellulose fiber around it. The blended yarn, the blended yarn, the core yarn, and the covered yarn may be provided as two types of yarns each combining a regenerated cellulose fiber and a polycarbonate fiber, and a regenerated cellulose fiber and a polylactic acid fiber.

  Alternatively, the woven fabric may be produced by using one of warp and weft as a yarn made of regenerated cellulose fiber and the other as a yarn made of thermoplastic resin fiber. The knitted fabric may also be knitted with yarns made of regenerated cellulose fibers and yarns made of thermoplastic resin fibers. Yarns made of thermoplastic resin fibers may be provided as two types of yarns made of polycarbonate fiber and polylactic acid fiber, respectively. The structure | tissue of the textile fabric and knitted fabric which comprises a sheet | seat base material is not specifically limited, The thing of the structure currently used widely may be used. The woven fabric and the knitted fabric may be a multiple woven fabric and a multiple knitted fabric, respectively.

  When the sheet base material is a woven fabric or a knitted fabric, the fineness and fiber length of the constituent fibers are selected according to the type of yarn constituting the woven fabric or the knitted fabric. For example, when a spun yarn is produced from staple fibers having a staple length, fibers having a fineness of 0.9 dtex to 5 dtex and a fiber length of 25 mm to 100 mm are generally used. From these ranges, regenerated cellulose fibers and thermoplastic resins are used. The fiber fineness and fiber length may be selected respectively.

If the sheet substrate is a woven or knitted, basis weight of the woven or knitted fabric, depending on the thickness or the like of the composite molded body to be obtained, for example, ^{400g / m 2 ~12000g / m 2} , particularly 500 g / m ² ~ 3600 g / ^{m 2,} more especially ^{100g / m 2 ~500g / m 2} , even more particularly may be a ^{150g / m 2 ~300g / m 2} . The basis weight of the woven or knitted fabric is adjusted by appropriately selecting the yarn count, the density of the warp and the weft, and the like.

In the present invention, the sheet base material is preferably a nonwoven fabric. This is because the nonwoven fabric can be produced by a method in which two or more kinds of fibers are relatively easily mixed uniformly at a desired ratio.
When making a sheet base material into a nonwoven fabric, a nonwoven fabric is manufactured by producing a fiber web using regenerated cellulose fibers and thermoplastic resin fibers, and then bonding and / or entwining the fibers to integrate them. The form of the fiber web is not particularly limited, and may be any form selected from card webs such as parallel web, cross web, semi-random web and random web, air lay web, wet paper web, and spunbond web. Also good.

  In the production of the nonwoven fabric, the method for integrating the fibers of the fiber web is not particularly limited. For example, the fibers may be integrated by a mechanical entanglement method such as a needle punch method and a hydroentanglement method. Alternatively, when the thermoplastic resin fiber is a composite fiber composed of two or more components, and one component exhibits thermal adhesiveness at a temperature lower than the temperature at which the regenerated cellulose fiber decomposes, the fibers are separated by the component. The fibers may be integrated by thermal bonding. The method using the thermal adhesiveness of thermoplastic resin fibers may also be applied when two or more types of thermoplastic resin fibers are used.

  The fineness and fiber length of the fibers constituting the nonwoven fabric are selected according to the form of the fiber web. The preferable range of the fiber length of the regenerated cellulose fiber and the thermoplastic resin fiber when the sheet base material is in the form of a nonwoven fabric is as described above. In producing any fiber web, the fiber length of the regenerated cellulose fiber may be the same as or different from that of the thermoplastic resin fiber. The fiber lengths of the polycarbonate fiber and the polylactic acid fiber may be different from each other.

  In producing any fiber web, the fineness of the regenerated cellulose fiber may be, for example, 0.1 dtex to 20 dtex. The fineness of the thermoplastic resin fiber may be, for example, 0.5 dtex to 50 dtex. Moreover, the fineness of the polycarbonate fiber and polylactic acid fiber which comprise a nonwoven fabric may mutually differ.

  The nonwoven fabric may be formed by laminating two or more fiber webs. In this case, one or more fiber webs may be made of regenerated cellulose fibers, and the other one or more fiber webs may be made of thermoplastic resin fibers. For example, three fibrous webs each made of regenerated cellulose fiber, polycarbonate fiber, and polylactic acid fiber may be prepared and laminated to produce a nonwoven fabric. The two or more fibrous webs may be made by the same method, or may be made by different methods (for example, a combination of a card web and a wet papermaking web).

If the sheet substrate and the nonwoven fabric, the basis weight of the nonwoven fabric, depending on the thickness and the like of the composite structure to be obtained, for example as good as ^{400g / m 2 ~12000g / m 2} , especially 500g ^/ m 2 ~3600g ^/ m ² may be used. In order to increase the basis weight of the nonwoven fabric, two or more of the same or different fiber webs may be laminated and subjected to a process for integrating the fibers (for example, fiber entanglement process such as a needle punch).

  The mixing ratio (mass ratio) of the regenerated cellulose fiber and the thermoplastic resin fiber is 20:80 to 60:40 (regenerated cellulose fiber: thermoplastic resin fiber) regardless of the type of fiber sheet used as the sheet substrate. Is preferred. More preferably, it is 30: 70-50: 50. When the ratio of the regenerated cellulose fiber is too small, the reinforcing effect by the regenerated cellulose fiber may not be sufficiently obtained. When the ratio of the regenerated cellulose fiber is too large, the thermoplastic resin does not sufficiently permeate between the regenerated cellulose fibers, and the mechanical strength of the composite molded body may be significantly reduced.

  The sheet base material may include fibers other than regenerated cellulose fibers and thermoplastic resin fibers (hereinafter also referred to as “third fibers”). For example, the sheet base material includes, as the third fiber, reinforcing fibers other than regenerated cellulose fibers, such as carbon fibers, glass fibers, or aramid fibers, or other cellulosic fibers (for example, cotton, bamboo linen, etc.). You can leave. The mixing ratio of the third fiber is, for example, 30% by mass or less, preferably 20% by mass or less, based on the entire sheet base material. These third fibers may also be included in substrates that are not sheet substrates, for example in the form of pellets.

  The sheet substrate may be a laminated sheet composed of a fiber sheet and other sheet-like material. Another sheet-like material is, for example, a film or net made of a thermoplastic resin. The other sheet-like material may be made of, for example, a thermoplastic resin that is difficult to form in the form of fibers, and in that case, it is easier to obtain a composite molded body containing such a thermoplastic resin as a matrix. It becomes.

(Composite molded body)
The composite molded body of the present invention can be said to be a fiber-reinforced composite molded body in which a thermoplastic resin containing at least polycarbonate and polylactic acid is a matrix and is reinforced with regenerated cellulose fibers. The physical property reinforced by the fiber is at least one of mechanical properties selected from tensile strength, bending strength, impact strength (particularly Charpy impact value), and the like. A composite molded body in which at least one improvement in mechanical properties is recognized by the addition of regenerated cellulose fiber is a fiber-reinforced composite molded body.

  The composite molded body of the present invention is provided as, for example, a sheet-like product or a three-dimensional structure molded into a predetermined shape.

The thickness and basis weight of the sheet-like composite molded body are appropriately selected according to the application and the like, and are not particularly limited. For example, the thickness is 0.3 mm to ¹⁰ mm, and 400 g / m ^{2 to} 12000 g / m ² . Has a basis weight. A sheet-like composite molded body containing a thermoplastic resin as a matrix can be provided as a stampable sheet that can be molded into another shape by heating and pressing. Stampable sheet molding is sometimes referred to as stamping molding.

  The sheet-like composite molded body may be produced from the above-mentioned sheet base material, or a mixture of regenerated cellulose fiber and thermoplastic resin pellets or powdered material, and a sheet shape using a molding machine. It may be manufactured by a manufacturing method. When a composite molded body is produced from a sheet base material, the thermoplastic resin fiber does not completely melt depending on the temperature and pressure applied to the thermoplastic resin fiber, and the thermoplastic resin fiber has a fiber shape in the composite molded body. May exist in a state maintained to some extent. In particular, as will be described later, when the thermoplastic resin has a high melting point and the decomposition of the regenerated cellulose fiber occurs when heated at a temperature higher than the melting point, the thermoplastic resin is processed at a temperature lower than the melting point. There exists a tendency for the shape of a fiber to be maintained more. When two or more types of thermoplastic resins are included and their melting points are different from each other, in the composite molded body produced from the sheet base material, only one type of thermoplastic resin fiber is melted, and its fiber shape is lost. Other thermoplastic resin fiber shapes may remain.

  When the composite molded body of the present invention is produced from a sheet substrate, the composite molded body has a matrix component derived from polycarbonate fibers and polylactic acid fibers. Polycarbonate generally has a melting temperature of about 200 ° C. to 250 ° C., which is higher than the decomposition temperature of regenerated cellulose fiber. Therefore, the polycarbonate fiber exists in a state where the fiber shape is partially maintained in the composite molded body. Tend to. Since polylactic acid generally has a melting point of about 160 ° C. to 180 ° C. and a low glass transition temperature, the polylactic acid fiber is easily melted in the composite molded body and easily loses its fiber shape. Therefore, the composite molded body manufactured from the sheet base material may be provided in a form in which the polycarbonate maintains a part of the fiber shape and the polylactic acid fiber is completely melted in the matrix.

A composite molded body in which the thermoplastic resin fibers are not completely melted is a composite molded body in which the thermoplastic resin is completely melted and solidified because the gaps between the regenerated cellulose fibers are not completely filled with the thermoplastic resin. is increased to specific volume compared to, specifically, for example, 1.1cm ³ /g~2.0cm ³ / g, in particular has a 1.2cm ³ /g~1.5cm ³ / g approximately specific volume obtain. The composite molded body in which the thermoplastic resin fibers are not completely melted has a structure in which a portion where the thermoplastic resin fibers are melted becomes a skeleton and a gap between the fibers is retained to some extent. The composite molded body having such a structure may exhibit sound absorption and / or shock absorption due to the voids. Further, such a composite molded body has a smooth surface and a rough tactile sensation derived from the sheet base material as compared with a composite molded body in which the thermoplastic resin is completely melted and solidified, or the surface The fiber fuzz is observed in FIG. In addition, since the composite molded body of the present invention contains regenerated cellulose fibers having water absorption per se, the thermoplastic resin fibers have a higher melting degree, for example, even when they are completely melted and solidified. The body shows some water absorption.

  The composite molded body of the present invention is generally provided as a three-dimensional structure processed into a predetermined shape. The three-dimensional structure is, for example, one formed by a molding machine using the pellets, one formed three-dimensionally when the sheet base material is heated, or the sheet-like composite molded body (stampable sheet). ) In a three-dimensional manner, or a mixture of regenerated cellulose fibers and thermoplastic resin pellets or powders and molding with a molding machine. Alternatively, the three-dimensional structure may be obtained by subjecting a block of the composite molded body to a cutting process to have a predetermined shape.

  In any form, the composite molded body of the present invention contains regenerated cellulose fibers as reinforcing fibers in a proportion of 20% by mass to 60% by mass with respect to the total mass of the regenerated cellulose fibers and the thermoplastic resin. Good. Preferably, it is 30 mass%-50 mass%. A composite molded body containing regenerated cellulose fibers at such a ratio has excellent mechanical properties. Moreover, when the ratio of the regenerated cellulose fiber is about that, it is easy to obtain a composite molded body in which the regenerated cellulose fibers are uniformly dispersed in the composite molded body.

(Production method of composite molded body)
The composite molded body of the present invention is produced by producing a composite molding substrate containing regenerated cellulose fibers and a thermoplastic resin, and bringing the composite molding substrate to a temperature at which at least a part of the thermoplastic resin melts or softens. It is manufactured by a manufacturing method including heating. Here, the manufacturing method using the said sheet | seat base material is demonstrated as one form of the manufacturing method. This embodiment includes making a sheet substrate and heating the sheet substrate at a temperature at which the thermoplastic resin fibers melt or soften.
A sheet base material in the form of a woven fabric or a knitted fabric can be produced by weaving or knitting a blended yarn of regenerated cellulose fibers and thermoplastic resin fibers by a usual method.

  A sheet substrate in the form of a nonwoven fabric is produced by making a fiber web and bonding and / or entanglement of the fibers in the fiber web. When the thermoplastic resin fiber has thermal adhesiveness, the fiber is bonded with a hot air through heat treatment machine (also referred to as an air through heat treatment machine), a hot air blowing heat treatment machine, an infrared heat treatment machine, or a hot roll process. You may implement using a machine etc. Thermal bonding with fibers is carried out at a temperature at which the thermoplastic resin melts or softens but the regenerated cellulose fibers do not decompose. However, if the thermoplastic resin fibers are thermally bonded, the sheet base material becomes too hard to be wound on a roll, and it becomes difficult to handle as a sheet base material. Pay attention to the heating time. Or you may implement adhesion | attachment of a fiber using an adhesive agent etc.

When the fibers are entangled, a hydroentanglement method or a needle punch method is used. In the present embodiment, the needle punch method is preferably used. According to the needle punch method, even when relatively large and the fiber web having a basis weight of, for example, 400g / m ² ~12000g / m ² approximately, capable of relatively easily entangled fibers. The needle punching treatment of the fiber web with a basis weight in this range is, for example, 36-42 needles with 3-9 barbs and a needle depth of 3-20 mm and 10-500 needles. It may be carried out by driving at a density of / cm ² .

  Next, the sheet base material is subjected to heat treatment to melt or soften the thermoplastic resin, and the resin is infiltrated between the regenerated cellulose fibers. The heat treatment may be accompanied by a pressure treatment. In particular, when the melting point of the thermoplastic resin is high and / or when the melt viscosity of the thermoplastic resin is high, the penetration of the thermoplastic resin between the regenerated cellulose fibers is further promoted by simultaneously performing the pressure treatment. Is done.

  Heating is performed at a temperature at which the thermoplastic resin melts or softens. If the heating temperature is set higher than the melting point of the thermoplastic resin, it becomes easier for the thermoplastic resin to penetrate between the regenerated cellulose fibers, but if the heating temperature exceeds the decomposition start temperature (230 ° C. to 240 ° C.) of the regenerated cellulose fibers, The regenerated cellulose fiber may deteriorate and the reinforcing effect of the regenerated cellulose fiber may not be obtained. In that case, it is preferable to carry out the pressurizing treatment at a heating temperature lower than the melting point of the thermoplastic resin. Considering that the thermoplastic resin contains at least polycarbonate and polylactic acid, and the melting point of the former is higher than the melting point of the latter, the heat treatment is preferably performed at a temperature at which the polylactic acid melts or softens.

  When the heating temperature is lower than the melting point of the thermoplastic resin, the heating temperature is preferably a temperature equal to or higher than the glass transition temperature of the thermoplastic resin. When heating at a temperature equal to or higher than the glass transition temperature, the regenerated cellulose fiber can be fixed with the thermoplastic resin by reducing the damage to the regenerated cellulose fiber by performing a pressure treatment. When the glass transition temperature of the thermoplastic resin is higher than the decomposition temperature of the regenerated cellulose fiber and / or when the penetration of the thermoplastic resin into the regenerated cellulose fiber is ensured by the pressure treatment, the heating temperature is changed to the glass transition temperature. It may be lower than the temperature. When it is desired to maintain the shape of the thermoplastic resin fiber to some extent in the obtained composite molded body, a heating temperature lower than the melting point of the thermoplastic resin may be selected. When it is desired to maintain the shape of the thermoplastic resin fiber, the pressure during the pressure treatment may be lowered.

  Considering that at least polycarbonate and polylactic acid are included as the thermoplastic resin, the heating temperature is preferably a temperature higher than the glass transition temperature of polylactic acid or a temperature higher than the glass transition temperature of polycarbonate. . However, when heat treatment is performed at a temperature higher than the glass transition temperature of polylactic acid and lower than the glass transition temperature of polycarbonate, the polycarbonate fibers are difficult to soften, and the thermoplastic resin (matrix component) may not sufficiently penetrate between the regenerated cellulose. Therefore, the heat treatment is more preferably performed at a temperature higher than the glass transition temperature of the polycarbonate. When a third resin is included, the temperature at which sufficient penetration of the matrix component is achieved is selected in consideration of the melting point and glass transition temperature of the resin.

  For example, when using a polycarbonate fiber having a melting temperature of about 200 ° C. to 250 ° C. and a polylactic acid fiber having a melting point of about 160 ° C. to 180 ° C., the heating temperature is 150 ° C. to 250 ° C. in order to suppress decomposition of the regenerated cellulose fiber. It is preferable to do. When the heating temperature is within this range, pressure treatment is performed. The pressurizing process is performed, for example, by applying a pressure of 1 MPa to 10 MPa. When another thermoplastic resin is included as the third resin, the heating temperature and pressure are preferably applied by applying a temperature and pressure at which two or more resins are melted or softened.

  When carrying out heat treatment and pressure treatment, a hot press machine may be used. Alternatively, the heat treatment may be performed first, and the pressure treatment may be subsequently performed while the thermoplastic resin is in a molten or softened state.

  When producing a composite molded body having a larger basis weight, the heat treatment and / or the pressure treatment may be performed by laminating a plurality of sheet base materials. In that case, the plurality of sheet base materials may be subjected to heat treatment and / or pressure treatment after being integrated integrally in advance (for example, by stitching) or chemically (for example, by adhesion).

  According to this embodiment, a sheet-like composite molded body can be obtained, or a three-dimensional structure can be obtained by applying a three-dimensional shape during heat treatment and / or pressure treatment. A composite molded body can be obtained. The sheet-like composite molded body (stampable sheet) can be formed into a shape having irregularities by further subjecting it to a heat press treatment. In that case, a thicker composite molded body may be obtained by laminating a plurality of sheet-shaped composite molded bodies and performing a hot press treatment.

  It goes without saying that the manufacturing method of the present embodiment is an embodiment for manufacturing the composite molded body of the present invention, and the composite molded body of the present invention may be manufactured by other manufacturing methods according to the shape. For example, the sheet-like composite molded body may be manufactured by a method in which a thermoplastic resin melted by impregnation or coating is applied to a fiber sheet made of regenerated cellulose fibers.

(Use of composite molded body)
The composite molded body of the present invention includes space and aircraft materials, marine materials, vehicle (including automobiles and bicycles) materials, sports equipment materials, OA equipment materials, electronic equipment materials, industrial materials, tanks and containers. It can be used as general materials, miscellaneous goods materials, and construction materials. Specifically, the composite molded body of the present invention is suitable for constituting an automobile interior material and sound absorbing material, a suitcase body, and a casing of a personal computer, a mobile phone, a copy machine, a multifunction machine, a game machine, and the like. ing.

The following were prepared as regenerated cellulose fibers.
Regenerated cellulose fiber:
Viscose rayon with a fineness of 1.7 dtex and a fiber length of 51 mm, and prepared flame retardant regenerated cellulose fiber containing an aromatic phosphate as a flame retardant (product DFG, manufactured by Daiwabo Rayon Co., Ltd.), the number of crimps 11.8 pieces / 25 mm, single fiber strength 2.18 cN / dtex, critical oxygen index 29).

The following were prepared as thermoplastic resin fibers.
Polycarbonate fiber:
A polycarbonate fiber having a fineness of 6.7 dtex and a fiber length of 64 mm was prepared. This polycarbonate fiber was produced by the following method. Polycarbonate (M7020J, manufactured by Mitsubishi Engineering Plastics Co., Ltd.) was melt-spun at a spinning temperature of 300 ° C. to obtain a spun filament with a fineness of 6.7 dtex. A fiber treatment agent was applied, 15 crimps / 25 mm were applied with a stuffing box type crimper, dried, and then cut to a fiber length of 64 mm. This polycarbonate fiber had a single fiber strength of 2.5 cN / dtex.

Polylactic acid fiber:
A polylactic acid fiber having a fineness of 3.3 dtex and a fiber length of 51 mm was prepared. This polylactic acid fiber was produced by the following method. Polylactic acid having a melting point of 175 ° C. was melt-spun at a spinning temperature of 230 ° C. to obtain a spun filament with a fineness of 9.9 dtex. Next, the spinning filament was stretched 3 times in hot water at 80 ° C. to a fineness of 3.3 dtex, then a fiber treatment agent was applied, and further 15 crimps / 25 mm were imparted by a stuffing box type crimper. And dried, and cut to a fiber length of 51 mm. This polylactic acid fiber had a single fiber strength of 3 cN / dtex.

  In the above, the single fiber strength is a load value when the fiber is cut when a tensile test is carried out using a tensile tester in accordance with JIS L 1015 with a sample holding interval of 20 mm.

Example 1
40% by mass of regenerated cellulose fiber, 30% by mass of polycarbonate fiber and 30% by mass of polylactic acid fiber are mixed (polycarbonate: polylactic acid = 5: 5 (mass ratio), and the basis weight is 376 g / m ^2. This web was subjected to needle punching using a 40th needle under the conditions of a needle depth of 10 mm and a density of 130 / cm ² to form a needle punch nonwoven fabric having a thickness of 1.1 mm. This non-woven fabric was subjected to heating and pressurizing treatment using a hot press machine under conditions of a temperature of 200 ° C. and a pressure of 3 MPa to obtain a sheet-like composite molded body.

(Comparative Example 1)
40% by mass of regenerated cellulose fiber and 60% by mass of polycarbonate fiber were mixed, a fiber web was prepared in the same procedure as in Example 1, and a nonwoven fabric was prepared from the web. This nonwoven fabric was subjected to heating and pressurizing treatment using a hot plate press under the conditions of a temperature of 200 ° C. and a pressure of 3 MPa to obtain a sheet-like composite molded body.

(Comparative Example 2)
40% by mass of regenerated cellulose fiber and 60% by mass of polylactic acid fiber were mixed, a fiber web was prepared in the same procedure as in Example 1, and a nonwoven fabric was prepared from the fiber web. This nonwoven fabric was subjected to a heating and pressurizing process using a hot press machine under the conditions of a temperature of 200 ° C. and a pressure of 3 MPa to obtain a sheet-like composite molded body.

  Table 1 shows the basis weight, thickness, specific volume, tensile strength, elongation, and fracture length of the composite molded body of each example and each comparative example. The basis weight, thickness, specific volume, tensile strength, and tear length were determined according to the following methods.

(Weight)
The sample was cut into 15 cm × 15 cm, and its weight was measured to obtain.
(Thickness)
Measurement using a nonwoven fabric thickness measuring device (trade name “THICKNESS GAUGE”, model: CR-60A, manufactured by Daiei Kagaku Seisakusho Co., Ltd.) under a load of 20 g per 1 cm ^{2 of} sample according to JIS L1096 did.
(Specific volume)
Calculated from the basis weight and thickness.

(Tensile strength)
In accordance with JIS L 1096, a sample piece having a width of 5 cm and a length of 15 cm is gripped so that the chuck spacing is 10 cm, and a constant speed extension type tensile tester (trade name: Tensilon UCT-1T manufactured by Orientec Co., Ltd.) is used. The sample piece was stretched at a tensile rate of 30 cm / min, and the load value and elongation rate at break were measured as the breaking strength and breaking elongation, respectively.
(Breaking length)
The tensile strength and basis weight were calculated from the following formula.
Breaking length (km) = [Tensile strength (N / 5cm) /9.8) × 1000] / [Width (mm) of sample for measuring tensile strength × Weight (g / m ² )]

  Example 1 in which polycarbonate fiber and polylactic acid fiber are used in combination as the thermoplastic resin fiber has higher tensile strength and higher mechanical strength than Comparative Example 2 in which only the polylactic acid fiber is used as the thermoplastic resin fiber. Met. Example 1 had a lower tensile strength than Comparative Example 1 in which only polycarbonate fibers were used as thermoplastic resin fibers, but the decrease was small considering that half of the fibers were replaced with polylactic acid fibers. Met. This indicates that the combination of polycarbonate fiber and polylactic acid fiber is useful for producing a composite molded product having a relatively high tensile strength when a composite molded product is produced using regenerated cellulose fiber as a reinforcing fiber. ing.

The present invention includes the following aspects.
(Aspect 1)
A composite molding substrate containing regenerated cellulose fibers and a thermoplastic resin, wherein the thermoplastic resin contains at least polycarbonate and polylactic acid.
(Aspect 2)
The base material for composite molding according to aspect 1, wherein the base material is a nonwoven fabric, and the thermoplastic resin is contained as thermoplastic resin fibers.
(Aspect 3)
A composite molded body in which regenerated cellulose fibers are included as reinforcing fibers and a thermoplastic resin is included as a matrix, and the composite molded body includes at least polycarbonate and polylactic acid as the thermoplastic resin.
(Aspect 4)
Producing a composite molding substrate comprising at least polycarbonate and polylactic acid as a recycled cellulose fiber and a thermoplastic tree, and bringing the composite molding substrate to a temperature at which at least a part of the polycarbonate and polylactic acid melts or softens; The manufacturing method of a composite molded object including heating by heating.
(Aspect 5)
The manufacturing method of the composite molded object of aspect 4 which makes the temperature which heats the said base material for composite shaping | molding more than the glass transition temperature of a polycarbonate, and is lower than the decomposition temperature of a regenerated cellulose fiber.
(Aspect 6)
The method for producing a composite molded body according to aspect 4 or 5, further comprising pressing the base material for composite molding.
(Aspect 7)
The composite molded body according to aspect 4 or 5, wherein the composite molding base material is a fiber sheet containing the thermoplastic resin as thermoplastic resin fibers, and further includes pressing the fiber sheet to obtain a sheet-shaped composite molded body. Manufacturing method.

  The composite molded body of the present invention includes space and aircraft materials, marine materials, vehicle (including automobiles and bicycles) materials, sports equipment materials, OA equipment materials, electronic equipment materials, industrial materials, tanks and containers. It is useful as a general material, miscellaneous goods material, and construction material.

Claims (7)

  A composite molding substrate containing regenerated cellulose fibers and a thermoplastic resin, wherein the thermoplastic resin contains at least polycarbonate and polylactic acid.   The base material for composite molding according to claim 1, wherein the base material is a nonwoven fabric, and the thermoplastic resin is contained as thermoplastic resin fibers.   A composite molded body in which regenerated cellulose fibers are included as reinforcing fibers and a thermoplastic resin is included as a matrix, and the composite molded body includes at least polycarbonate and polylactic acid as the thermoplastic resin. Producing a composite molding substrate comprising at least polycarbonate and polylactic acid as a recycled cellulose fiber and a thermoplastic tree, and bringing the composite molding substrate to a temperature at which at least a part of the polycarbonate and polylactic acid melts or softens; The manufacturing method of a composite molded object including heating by heating.   The manufacturing method of the composite molded object of Claim 4 which makes temperature which heats the said base material for composite shaping | molding more than the glass transition temperature of a polycarbonate, and is lower than the decomposition temperature of a regenerated cellulose fiber.   The method for producing a composite molded body according to claim 4, further comprising pressing the base material for composite molding.   The composite molding base material is a fiber sheet containing the thermoplastic resin as a thermoplastic resin fiber, and further includes pressing the fiber sheet to obtain a sheet-like composite molded product. A method for producing a composite molded body.