Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
  • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
  • B29C70/28—Shaping operations therefor
  • B29C70/40—Shaping or impregnating by compression not applied
  • B29C70/50—Shaping or impregnating by compression not applied for producing articles of indefinite length, e.g. prepregs, sheet moulding compounds [SMC] or cross moulding compounds [XMC]
  • B29C70/504—Shaping or impregnating by compression not applied for producing articles of indefinite length, e.g. prepregs, sheet moulding compounds [SMC] or cross moulding compounds [XMC] using rollers or pressure bands
  • B29C70/506—Shaping or impregnating by compression not applied for producing articles of indefinite length, e.g. prepregs, sheet moulding compounds [SMC] or cross moulding compounds [XMC] using rollers or pressure bands and impregnating by melting a solid material, e.g. sheet, powder, fibres
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
  • C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
  • C08J5/047—Reinforcing macromolecular compounds with loose or coherent fibrous material with mixed fibrous material
• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
  • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
  • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
  • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
  • D04H1/4209—Inorganic fibres
• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
  • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
  • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
  • D04H1/58—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives
  • D04H1/64—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives the bonding agent being applied in wet state, e.g. chemical agents in dispersions or solutions

Definitions

• the present invention relates to a sheet for a molded article useful as a precursor of a fiber reinforced plastic molded article using thermoplastic fibers as a matrix resin, and a fiber reinforced plastic molded article obtained by heat-pressing it.
• a thermoplastic resin fiber Patent Document 1
• super engineering plastic that is heat resistant and highly flame retardant as a matrix resin, and is molded in a short time with flame retardancy.
• the present invention relates to a sheet that is useful as a stampable sheet that can be used, and a flame-retardant and high-strength fiber-reinforced plastic molded body obtained by heating and pressing the sheet.
• a member (precursor) before molding of a fiber reinforced plastic molded body using a thermosetting resin as a matrix resin is generally referred to as “prepreg”.
• the stampable sheet in the present invention is formed using a thermoplastic resin called a super engineering plastic as a matrix resin component, and is a precursor for producing a fiber-reinforced plastic molded body by heat and pressure molding The sheet corresponds to the “prepreg”.
• thermosetting resin such as a phenol resin
• thermosetting resin needs to be cured by polymerization reaction while being heated to a temperature of about 122 ° C. to 177 ° C.
• the polymerization reaction takes about 2 hours, the heat molding time becomes longer and the production takes place.
• the property is low (Non-patent Document 1).
• thermoplastic resin used as the matrix resin
• the impact resistance of the fiber reinforced resin molded product is excellent, and the storage management of the resin and the fiber reinforced resin composite material in the state before molding processing is easy, and the molding time is short. Since there is an excellent point such as paddle, for example, research and development of a fiber reinforced resin molded body made of a fiber reinforced resin composite material using a thermoplastic resin as a matrix resin such as a polycarbonate resin, a polyester resin, or a polypropylene resin has been conducted.
• Non-patent Document 1 when producing a fiber reinforced resin molded body with these resins, as a method for producing a stampable sheet which is a sheet used as a precursor thereof, depending on the type of resin impregnation method for fibers, a melting method ( Hot melt methods), solvent methods, dry powder coating methods, powder suspension methods, resin film impregnation methods (film stacking methods), mixed weaving methods (Commingle), and the like have been proposed (Non-patent Document 1).
• the melting method is a manufacturing method in which a thermoplastic resin is melted by an extruder, continuous fibers are passed through a melting bath, and the resin is impregnated into the inside of the fiber.
• the solvent method is a resin (mainly amorphous resin) that is a solvent. This is a production method in which a reinforcing fiber is impregnated using a solution dissolved in (1).
• the dry powder coating method is a method in which dry powder is adhered to reinforcing fibers and heated in the next step to melt and impregnate the powder.
• the powder suspension method is a method in which reinforcing fibers are passed through a tank in which resin powder is uniformly dispersed in water or solvent, the powder is adhered to the reinforcing fibers, and heated in the next step to melt and impregnate the powder.
• the resin film impregnation method is a manufacturing method in which a resin film and reinforcing fibers are combined and the resin is melted and impregnated by a double belt press or an intermittent press method.
• the mixed weaving method is a technique for producing a composite yarn by combining a reinforcing fiber and a thermoplastic resin fiber.
• the composite yarn is processed into a fabric (unidirectional, plain weave, braided string, multiaxial woven fabric, etc.) to obtain an intermediate material, which is directly passed through a thermoforming process, and a thermoplastic resin fiber is combined with a reinforcing fiber to obtain a product.
• Patent Document 2 a technique has been proposed in which a short fiber of a thermoplastic resin and a reinforcing fiber are mixed and dispersed in air or water to form a sheet, and the thermoplastic resin short fiber and the reinforcing fiber are combined.
• Patent Document 2 a proposal is made to heat and press-mold a web obtained by uniformly mixing carbon fibers as reinforcing fibers and a thermoplastic fibrous matrix resin in air or water and capturing them on a net.
• Patent Document 3 discloses a technique for heat-pressing a paper-making substrate obtained by dispersing reinforcing fibers and matrix resin fibers in a dispersion medium, mixing and then removing the dispersion medium. ing.
• a fiber reinforced resin molded article using a thermoplastic resin such as polycarbonate resin, polyester resin, or polypropylene resin as a matrix resin as described above has a thermosetting resin as a matrix resin in terms of heat resistance and flame retardancy. There is a disadvantage that it is inferior to the fiber reinforced resin molded product.
• Patent Document 4 discloses a sheet for a fiber-reinforced plastic molded body comprising a high melting point thermoplastic material and a reinforcing fiber.
• Japanese Patent No. 4832072 Japanese Patent Publication No.62-1969 JP 2011-157638 A Japanese Patent No. 4708330
• thermoplastic resins With regard to thermoplastic resins, in recent years, thermoplastic resins with excellent heat resistance and chemical resistance have been actively developed, and the above-mentioned drawbacks that have become common knowledge about thermoplastic resins have been remarkably improved. Has been.
• Such thermoplastic resins are so-called “super engineering plastics” (super engineering plastics), such as polyphenylene sulfide (PPS), polyether ether ketone (PEEK), polyamide imide (PAI), polyether imide (PEI). (Non-Patent Document 1).
• PPS polyphenylene sulfide
• PEEK polyether ether ketone
• PAI polyamide imide
• PEI polyether imide
• thermoplastic resin referred to as the “super engineering plastic” is one of the characteristics that not only has excellent physical properties but also extremely high flame retardancy, and the limiting oxygen index is 30 or more in the state of the resin block. There are many things. Although various attempts have been made to study stampable sheets using such super engineering plastics, there are the following problems.
• Stampable sheets manufactured by the melting method hot melt method
• solvent method dry powder coating method
• powder suspension method dry powder impregnation method
• resin film impregnation method film stacking method
• Stampable sheets using super engineering plastics are characterized by a shorter molding time than thermosetting prepregs, but they are melted (hot melt), solvent, dry powder coating, powder suspension, resin Stampable sheets manufactured by the film impregnation method (film stacking method) have poor breathability, so if you try to mold in a short time, the bubbles that exist between the hot plate for pressing and the sheet cannot be removed, and the molten resin It is easy to generate defects such as defects in appearance and defects in strength.
• the woven fabric obtained by the mixed weaving method can give flexibility before forming, but generally has a lower productivity than the method in which short fibers are dispersed in air or water to form a sheet. It has the disadvantage of high cost.
• Patent Document 2 and Patent Document 3 carbon fibers that are reinforcing fibers and thermoplastic fibrous matrix resin are uniformly mixed in air or water and captured on a net.
• a proposal has been made to heat-press the obtained web, and Patent Document 3 obtained by dispersing reinforcing fibers and matrix resin fibers in a dispersion medium, mixing and removing the dispersion medium.
• a technique for heat-pressing a papermaking substrate has been disclosed, such a web or papermaking substrate has a binder as an essential component in order to obtain process strength when moving to a pressing process after mat formation. .
• thermoplastic resins which are super engineering plastics with high heat resistance and flame retardancy, as matrix resins are exposed to temperatures as high as 300 ° C or higher during heat and pressure molding.
• Voids (hereinafter referred to as “voids”) are generated due to the vaporized binder, and both appearance and strength are likely to be reduced.
• a stampable sheet using a normal thermoplastic resin as a matrix resin, such as nylon or polypropylene, and a prepreg using a thermosetting resin as a matrix resin are not molded at such a high temperature.
• fiber reinforced plastic in which a matrix resin is impregnated with a sheet in which reinforcing fibers are aligned or a sheet in which reinforcing fibers are knitted in a cross shape shows a very high bending strength in the direction of the reinforcing fibers.
• the bending strength is weak in a direction different from the direction.
• a method for improving this there is a method of laminating and pressing a plurality of sheets composed of sheets in which reinforcing fibers are aligned or a sheet in which reinforcing fibers are knitted in a cross shape, with their fiber directions being shifted, Problems such as a complicated process and a decrease in the yield of the stampable sheet occur.
• a stamper from which a fiber-reinforced resin molded article having high strength, high heat resistance, and excellent flame retardancy using a thermoplastic resin having high heat resistance and flame retardancy as a matrix resin is obtained.
• a sheet useful as a bull sheet in addition to obtaining a sufficiently strong fiber-reinforced resin molded article without generation of voids even in a very short heat-press molding time, as a stampable sheet
• An object of the present invention is to provide a sheet useful as a stampable sheet having high productivity and excellent handling properties in a processing process at a low cost.
• the fiber reinforced resin molded body after heat and pressure molding is excellent in the strength of the fiber in the reinforcing fiber sheet, and is also excellent in the strength in the direction different from the direction of the fiber in the reinforcing fiber sheet;
• An object is to provide a sheet that can be made.
• the present inventors in a fiber reinforced plastic molded sheet using a heat-resistant and flame-retardant thermoplastic resin called a so-called super engineering plastic as a matrix resin, A non-woven sheet containing chopped strands of super engineering plastic fibers having a specific fiber diameter as a matrix resin component and a multilayer sheet in which reinforcing fibers are aligned or reinforcing fiber sheets woven in a cross shape are bonded together
• the matrix fiber is sufficiently melted and penetrated into the reinforcing fiber sheet even when the heating and pressing time is shorter than that of a stampable sheet using a conventional high heat-resistant thermoplastic resin.
• the present inventors have found that a fiber-reinforced plastic molded body having sufficient strength can be obtained.
• the multilayer sheet including the nonwoven fabric sheet described above needs to contain a binder for binding the intersections of chopped strand (short fiber) super engineering plastic fibers and reinforcing fibers.
• the handleability as a stampable sheet is good, and heating is applied. It has been found that after pressure molding, a high-strength, fiber-reinforced resin molded article can be obtained with no voids and good appearance.
• a multilayer sheet in which a reinforcing fiber sheet and a nonwoven sheet containing a matrix resin component are bonded, and the nonwoven sheet has at least a critical oxygen index of 25 or more and a fiber diameter.
• a fiber reinforced plastic molded sheet comprising a matrix resin component composed of chopped strands of super engineering plastic fibers of 30 ⁇ m or less and a binder component.
• the nonwoven fabric sheet containing the matrix resin component has a chopped strand of reinforcing fiber, a critical oxygen index of 25 or more, a fiber diameter of 30 ⁇ m or less, and 4 times or less of the fiber diameter of the reinforced fiber chopped strand.
• binder component according to any one of items (1) to (6), wherein the binder component is applied to the nonwoven fabric sheet by a coating method or an impregnation method as a solution or emulsion containing the binder component.
• Sheet for fiber reinforced plastic molding stampable sheet.
• the binder of the solution or emulsion is an emulsion containing a copolymer containing at least one selected from methyl methacrylate and ethyl ethacrylate as a monomer component.
• Sheet for fiber reinforced plastic molding stampable sheet.
• the blending ratio of the binder which is an emulsion is 0.5% to 3.0% by weight with respect to the stampable sheet, and the blending ratio of the binder which is a fibrous thermoplastic resin is 1% with respect to the stampable sheet.
• the reinforcing fiber sheet is a one-way continuous fiber selected from inorganic fibers such as glass fibers and carbon fibers, and organic fibers excellent in heat resistance such as aramid fibers and PBO (polyparaphenylene benzoxazole) fibers.
• the sheet for fiber-reinforced plastic molded articles (stampable sheet) according to any one of items (1) to (11), wherein the sheet is selected from a sheet that is aligned in a woven fabric or a woven fabric woven in a cloth shape.
• a stampable sheet comprising the fiber-reinforced plastic molded sheet according to any one of (1) to (12).
• the matrix resin component made of the super engineering plastic fibers is melted by using the fiber-reinforced plastic molded sheet described in any one of (1) to (12) as a stampable sheet.
• the sheet for a fiber-reinforced plastic molded body of the present invention is molded into a fiber-reinforced resin molded body having good strength and appearance without generation of voids by heat and pressure molding.
• the sheet for fiber-reinforced plastic molded body of the present invention it is possible to obtain a fiber-reinforced resin molded body having excellent strength not only in the direction of reinforcing fiber but also in other directions.
• the “fiber reinforced plastic molded sheet” is a multilayer sheet formed by laminating a reinforcing fiber sheet and a nonwoven fabric sheet containing thermoplastic resin fibers as a matrix resin component.
• the reinforcing fiber sheet used for the fiber-reinforced plastic molded sheet of the present invention a sheet in which continuous fibers used in general fiber-reinforced plastic are aligned in one direction, or a woven cloth woven in a cloth shape is used. Can be used.
• the material of the reinforcing fiber used for the sheet composed of such continuous fibers is not particularly limited as long as sufficient strength according to the use as the fiber reinforced plastic body can be obtained, and inorganic such as glass fiber and carbon fiber. It is also possible to use organic fibers having excellent heat resistance, such as fibers, aramid fibers, PBO (polyparaphenylene benzoxazole) fibers, or the like.
• the molding temperature when forming a molded body using a fiber reinforced plastic molded sheet as a stampable sheet is as high as 300 to 400 ° C. Therefore, even if it is a fiber that does not have a softening point like para-aramid fiber or PBO fiber and has a thermal decomposition temperature higher than 400 ° C. or a thermoplastic fiber that has a softening point, it is a fiber whose softening temperature is higher than the molding temperature. is there.
• bending strength and tensile strength can be obtained by heating and pressing at the melting temperature of the matrix resin fibers.
• -A fiber-reinforced plastic body having a high elastic modulus can be obtained.
• a fiber-reinforced plastic body formed as a stampable sheet using a fiber-reinforced plastic molded sheet containing organic fibers such as aramid as a reinforcing fiber is generally formed from a stampable sheet using inorganic fibers as reinforcing fibers. Because it has better wear resistance than fiber reinforced plastics, and even if a part of the fiber reinforced plastics is scraped off by rubbing etc., the shavings are softer than inorganic fibers, so there is less risk of damaging the object to be polished It is.
• the nonwoven fabric sheet used for the fiber-reinforced plastic molded sheet of the present invention is composed of a nonwoven fabric containing thermoplastic resin fibers and a binder that are at least melted by thermoforming to form a matrix resin.
• thermoplastic resin fibers used for the nonwoven fabric sheet thermoplastic resin fibers called super engineering plastics (super engineering plastics), and low melting point thermoplastic resin fibers such as PET, PP, PE, etc., have a certain length.
• a method of forming a web by dispersing chopped strands cut into air and capturing them in a net dry nonwoven fabric method
• the above-mentioned super engineering plastic fibers and low melting point thermoplastic resin fibers such as PET, PP, PE
• a nonwoven fabric sheet produced by a method (wet nonwoven fabric method) or the like in which chopped strands are dispersed in a solvent and then the solvent is removed to form a web is used.
• the low melting point thermoplastic resin fiber has a melting point of 180 ° C. or less, and examples thereof include fibers made of PP, PE, PET, modified PET, and the like, or core-sheath fibers thereof.
• the addition amount is preferably about twice or less than that of the binder component added to the nonwoven fabric sheet.
• a preferable combination as a binder component is a combination of an acrylic emulsion and a chopped PET fiber as a low melting point thermoplastic resin fiber.
• the amount of PET fiber is 1 to 7 parts by mass with respect to 0.1 to 4 parts by mass of the acrylic binder.
• the amount is preferably 2 to 6 parts by mass of PET fiber with respect to 1 to 3 parts by mass of the acrylic binder, and more preferably 3 to 5 parts by mass of PET fiber with respect to 1.5 to 2.5 parts by mass.
• the super engineering plastic fiber in the nonwoven fabric sheet used for the fiber-reinforced plastic molded sheet of the present invention is obtained by fiberizing a heat-resistant and flame-retardant thermoplastic resin.
• thermoplastic resins examples include polyetheretherketone (PEEK), polyamideimide (PAI), polyphenylene sulfide (PPS), polyetherimide (PEI), polyetherketoneketone (PEKK), etc. It is not limited to this.
• the super engineering plastic fiber preferably has a critical oxygen index of 25 or more and a glass transition temperature of 140 ° C. or more in the fiber state.
• the critical oxygen index of the super engineering plastic fiber component is 25 or more, the flame retardancy is excellent.
• the “limit oxygen index” represents an oxygen concentration necessary to continue combustion, and is a numerical value measured by a method described in JIS K7201. That is, a critical oxygen index of 20 or less is a numerical value indicating that combustion is performed in normal air.
• the super engineering plastic fiber in the nonwoven fabric sheet can be used without particular limitation as long as the fiber diameter is 30 ⁇ m or less, but is preferably 20 ⁇ m or less, and can be used up to about 1 ⁇ m as long as it is easily available.
• Super engineering plastic fibers are required to be sufficiently fluid under temperature conditions of 300 ° C. to 400 ° C. when used as a stampable sheet for heat and pressure molding. Since it is required that the fiber state is sufficiently maintained although it is partially melted under the heat treatment conditions applied when the reinforcing fiber sheet and the nonwoven fabric sheet are bonded in the manufacturing process of the sheet for reinforced plastic molded body,
• the glass transition temperature of engineering plastic fibers is preferably 140 ° C. or higher.
• it is a super engineering plastic fiber having a glass transition temperature of less than 140 ° C. such as PPS resin fiber, it can be used as long as the super engineering plastic having a resin deflection temperature of 190 ° C. or higher is made into a fiber.
• Such super engineering plastic fibers are melted by heating and pressurizing to form a resin block having a very high flame retardancy with a limiting oxygen index of 30 or more.
• the PPS resin has high chemical resistance and high heat resistance.
• a fiber reinforced plastic having excellent strength can be obtained.
• PEI resin has excellent adhesion to carbon fiber and glass fiber, and the critical oxygen index is very high at 47 in the state of resin block, A fiber reinforced plastic having excellent strength and flame retardancy can be obtained.
• PEEK polyether ether ketone
• the sheet for a fiber-reinforced plastic molded article useful as a stampable sheet of the present invention has a void in the sheet because a thermoplastic resin component called a super engineering plastic that forms a matrix by heat and pressure molding has a fiber form. Is present. Therefore, the resin is completely between the fibers as in the stampable sheet formed by the melting method (hot melt method), solvent method, dry powder coating method, powder suspension method, resin film impregnation method (film stacking method), etc.
• the stampable sheet embedded in the sheet the sheet itself is flexible and draped before being heated and pressed, and the stampable sheet can be stored and transported in the form of winding, It is characterized by excellent handling properties, such as being able to be heat-pressed after being placed along.
• the fiber-reinforced plastic molded sheet of the present invention in which the resin that forms the matrix during heat-pressure molding is a super engineering plastic fiber is heat-pressure molded when processed into a fiber-reinforced plastic rather than a prepreg using a thermosetting resin.
• the original characteristics are that it takes a short time and is highly productive.
• the fiber diameter is preferably 30 ⁇ m or less, and more preferably 20 ⁇ m to 1 ⁇ m.
• the fiber length of the super engineering plastic fiber is not particularly limited, but is preferably about 3 mm to 30 mm because it is produced by a wet or dry nonwoven fabric method. When longer than this, a fiber will not disperse
• the fiber diameter and fiber length may be single, or those having different fiber diameters and fiber lengths may be blended and used.
• the non-woven sheet containing super engineering plastic fibers can be made into a non-woven sheet containing chopped strands of reinforcing fibers.
• the super engineering plastic fibers and the chopped strands of reinforcing fibers are uniformly mixed in the non-woven sheet. It is preferable that the fiber diameters of the matrix resin fibers are approximate.
• the fiber diameter of the super engineering plastic fiber is preferably 4 times or less, more preferably 3 times or less of the fiber diameter of the reinforcing fiber blended in the nonwoven fabric sheet, Most preferably, the fiber diameters of the reinforcing fibers are equal or substantially equal.
• the chopped strands of reinforcing fibers used in the nonwoven fabric sheet may be the same fibers as the reinforcing fibers forming the reinforcing fiber sheet to be bonded to the nonwoven fabric sheet or different fibers.
• the molding temperature at the time of heat-press molding the sheet for fiber-reinforced plastic molded article of the present invention as a stampable sheet is as high as 300 to 400 ° C.
• Inorganic fibers such as glass fibers and carbon fibers, or organic fibers having excellent heat resistance are used.
• organic fiber is used as the reinforcing fiber used in the nonwoven fabric sheet, it is a resin fiber that does not have a softening point and has a thermal decomposition temperature of 400 ° C. or higher unlike para-aramid fiber and PBO fiber, or a thermoplastic that has a softening point.
• it is a resin fiber, it needs to be a resin fiber whose softening temperature is higher than the molding temperature.
• binder In the present invention, as the binder used for the nonwoven fabric sheet, acrylic resins, styrene / acrylic resins, thermoplastic resins, urethane resins, PVA resins and the like generally used for nonwoven fabric production can be used.
• the binder component is particularly preferably a resin component that is compatible with the resin when the super engineering plastic fiber that becomes the matrix after the heat and pressure molding is melted by the heat and pressure molding.
• a resin component that is compatible with the resin when the super engineering plastic fiber that becomes the matrix after the heat and pressure molding is melted by the heat and pressure molding.
• PET or modified PET which is a binder component compatible with the resin when melted by heat and pressure molding.
• PET or modified PET is used as a binder
• the shape is powder, fibrous, or ordinary PET placed on the core, and the periphery is covered with modified PET having a melting point lower than that of the core.
• a sheath-structured PET fiber or the like is preferably used.
• copolymerized PET (CoPET) is preferable, and examples thereof include urethane-modified copolymerized PET.
• Modified PET as described in JP-B-1-30926 may be used.
• melty 4000 (a fiber in which all fibers are copolymerized polyethylene terephthalate) manufactured by Unitika is preferably exemplified.
• core-sheath binder fiber Unitika Melty 4080, Kuraray N-720, or the like can be suitably used.
• the modified PET preferably has a melting point of 140 ° C. or lower, more preferably 120 ° C. or lower. .
• the binder content in the nonwoven fabric sheet is preferably 10% by mass or less, more preferably 7% by mass or less as the content in all stampable sheets (sheets for all fiber-reinforced plastic molded articles). 0.05 mass% or more.
• Such a binder component generally has a lower limit oxygen index than a flame retardant super engineering plastic fiber component having a limit oxygen index of 25 or more. The flame retardancy required when used as a sheet may be impaired. Even if the air permeability of the stampable sheet is 200 seconds or less, voids are formed in the fiber reinforced plastic formed by generating a large amount of gas by thermal decomposition at the heating and pressing temperature. May form, or the binder itself may discolor and remain, resulting in a fiber-reinforced plastic with poor appearance and strength.
• the content of the binder component in the nonwoven fabric sheet is preferably 10% by mass or less, and more preferably 7% by mass or less in the fiber reinforced plastic molded sheet.
• the amount of the binder component in the nonwoven fabric sheet is too small, the overall strength when used as a stampable sheet may be insufficient, which may cause tearing during operation, and may be used as a stampable sheet.
• the fibers on the surface of the nonwoven fabric sheet may fall off and splash in the processing process, so the content of the binder component in the nonwoven fabric sheet is during handling of the fiber reinforced plastic molded sheet In such a case, the above-described disadvantage is not caused.
• the binder component used in the present invention is preferably unevenly distributed in the surface layer portion of the nonwoven fabric sheet.
• the inner layer can be in a state of relatively less binder.
• a liquid material in which the binder component is dissolved in a solvent, or an emulsion of the binder component (emulsion) ) Is applied by dipping or spraying, and then dried by heating.
• the binder since the solvent inside the web moves to the surface layers on both sides and evaporates during heating and drying, the binder also concentrates relatively on the surface layer as the solvent moves. In this case, it is preferable that the solvent move more because the uneven distribution of the binder component becomes stronger.
• the moisture in the web can be adjusted by adjusting the binder solution concentration of the aqueous binder solution or emulsion, the wet suction in the wet nonwoven fabric manufacturing process, and the moisture suction force by dry suction. .
• the moisture content in the web is preferably 50% or more. However, if there is more moisture, the drying load increases and the production cost increases. Is preferably adjusted.
• the degree of uneven distribution of the binder component can be grasped by measuring the amount of each binder component by dividing the nonwoven fabric sheet into approximately three to five portions in the thickness direction (Z-axis direction).
• the degree of uneven distribution of the binder component is preferably such that the amount of binder in the inner layer is 1/2 to 1/10 with respect to the surface layer when the binder component is roughly divided into three equal parts.
• the nonwoven sheet is wet-made, and the machine direction (MD direction) and the perpendicular direction (CD direction) of the machine are adjusted by adjusting the jet wire ratio. It is also preferable to increase the intensity ratio (hereinafter referred to as “strength aspect ratio”).
• the strength aspect ratio when the strength aspect ratio is increased, the fibers tend to line up in one direction, and the density of the nonwoven fabric tends to increase. As a result, the intersections between the fibers increase, so that a sufficient surface strength can be obtained even with a small amount of binder.
• Such an effect can be clearly obtained usually when the strength aspect ratio is 1.5 or more, more clearly is 3.0 or more, and more clearly is 5.0 or more.
• the preferred strength aspect ratio is 15 or less, more preferably 10 or less.
• the order and number of layers when the nonwoven fabric sheet with the reinforcing fiber sheet is laminated to form a multilayer sheet are not particularly limited, but the nonwoven fabric is not present on both surface layers of the fiber reinforced plastic molded sheet. It is preferable to arrange a sheet.
• the nonwoven fabric sheet exhibits adhesiveness to the reinforcing fiber sheet by partial melting of the super engineering plastic fiber under the heat treatment conditions at the time of bonding, so both the front and back sides of the reinforcing fiber sheet
• the non-woven fabric sheet By disposing the non-woven fabric sheet, it is possible to form a sheet for a fiber-reinforced plastic molded article useful as a stampable sheet having good handling properties in which fiber fraying or the like does not occur on both surfaces.
• the number of laminated reinforcing fiber sheets and non-woven fabric sheets is not particularly limited, but if the number of laminated sheets is too large, the fiber reinforced plastic molded sheet becomes too thick and the handling property deteriorates. It is preferable to adjust the number of stacked sheets within a range not exceeding 2000 g / m 2 .
• a sheet for a fiber reinforced plastic molded body that is particularly useful as a stampable sheet can be produced. These sheets are cut into a flat plate immediately after the production of the sheet for a fiber reinforced plastic molded body, and then pressed. It can use suitably for a process.
• the matrix resin fibers are melted to such an extent that sufficient strength can be obtained even when wound.
• part of the matrix resin fibers may be converted into a film, and the air permeability may be impaired.
• the fiber reinforced plastic molded sheet in which the matrix resin is melted and cooled to form a film has lost flexibility, and when wound, the sheet breaks near the core.
• thermoplastic resin fiber having a melting point lower than that of the matrix resin fiber as a binder and further heating and pressing at a temperature lower than the melting point of the matrix resin fiber.
• flexibility and air permeability suitable for use as a stampable sheet can be ensured.
• the super engineering plastic fiber used in such a fiber reinforced plastic molded sheet is not particularly limited, and the thermoplastic resin binder used is not particularly limited as long as it has a melting point lower than that of the super engineering plastic fiber.
• a polyetherimide fiber is selected as the engineering plastic fiber, a modified polyester resin is particularly preferable.
• the polyester resin is compatible with the polyetherimide fiber when heated and melted, so that it is difficult to impair the excellent points such as flame retardancy and low smoke generation of the polyetherimide resin even after cooling.
• the preferable range of the amount of the modified polyester resin is 2% to 10% with respect to the nonwoven fabric. If the amount is too small, it is difficult to obtain an adhesive effect. If the amount is too large, the modified polyester resin itself melts to form a film and impairs air permeability.
• the preferred heating / pressurizing temperature at the time of bonding is 130 ° C. to 180 ° C., and sufficient interlayer strength is obtained within this range, Also, the flexibility of the sheet is not impaired.
• the sheet width of the matrix resin fiber sheet slightly wider than the sheet width of the reinforcing fiber cloth, the matrix resin fiber sheets are firmly bonded to each other, and fraying of the ends of the reinforcing fiber cloth is caused. Since it can suppress, it is preferable.
• Fiber-reinforced plastic molded sheet In the fiber-reinforced plastic molded sheet of the present invention, if the content of the reinforcing fiber component in the fiber-reinforced plastic molded sheet is too small, the reinforcing effect of the molded plastic body by the reinforcing fibers becomes insufficient. If it is too large, the matrix resin cannot cover the fibers and voids are generated, so that the reinforcing effect of the molded plastic body becomes insufficient.
• the ratio of the total reinforcing fibers to the super engineering plastic fibers in the fiber reinforced plastic molded sheet is preferably 5/95 to 70/30, more preferably 20/80 to 60/40 in volume ratio.
• the reinforcing fiber in the fiber-reinforced plastic molded sheet is a chopped strand of reinforcing fiber that may be contained in a nonwoven sheet containing a matrix resin component, and a reinforcing fiber sheet that is bonded to the nonwoven sheet. Means all the reinforcing fibers used.
• the strength of the fiber reinforced plastic body obtained by heating and pressing as a stampable sheet is reinforced fiber.
• the strength is particularly high with respect to the bending force in the direction of the reinforcing fibers in the sheet.
• the strength in the direction other than the direction of the reinforcing fiber is weaker than the strength in the direction of the reinforcing fiber.
• the fiber other than the direction of the fiber of the reinforced fiber sheet can be obtained by including the reinforced fiber in the nonwoven fabric sheet. Strength in the direction can be improved.
• the compounding amount of the reinforcing fiber component in the nonwoven fabric sheet forming the sheet for the fiber reinforced plastic molded body is such that the strength of the fiber direction of the reinforcing fiber sheet of the fiber reinforced plastic body becomes weaker as the amount of the reinforcing fiber in the nonwoven fabric sheet is increased. This can be adjusted as appropriate.
• Such adjustment may be performed in a range where the mass ratio of the reinforced fibers in the reinforcing fiber sheet and the chopped strands of the reinforcing fibers in the nonwoven fabric sheet is 95/5 to 20/80. However, it is preferably performed in the range of 90/10 to 40/60.
• stampable sheets manufactured by the melting method hot melt method
• solvent method dry powder coating method
• powder suspension method dry powder impregnation method
• resin film impregnation method film stacking method
• the sheet for fiber-reinforced plastic molded body of the present invention in which a nonwoven fabric sheet using super engineering plastic fibers as a matrix resin and a reinforced fiber sheet are laminated and integrated is that the matrix resin is fibrous and rich in air permeability, When used as a stampable sheet or air content between the press plate and the stampable sheet, because the reinforcing fiber sheet is reinforced in one direction or a woven fabric (cloth) of reinforcing fibers that is highly breathable. Further, the volatile gas component generated from the fiber reinforced plastic molded sheet is easily extracted from the sheet at the time of pressing, and voids and the like are not easily generated even in a short heating and pressurizing process.
• the sheet for fiber-reinforced plastic molded body of the present invention preferably has an air permeability of 200 seconds or less measured by a method based on the JAPAN TAPPI paper pulp test method. This numerical value indicates that the smaller the number, the easier air can pass through (the better the air permeability).
• the sheet for fiber-reinforced plastic molded body of the present invention since it is a laminate in which a nonwoven fabric sheet and a reinforced fiber sheet are bonded, if it becomes bulky, for example, it takes too much transportation cost or heat in the heating and pressing step. There is a concern that problems such as inconvenience may occur when inserting into a press machine, etc., but such problems are caused by the heat generated when the nonwoven fabric sheet containing super engineering plastic fibers and the reinforcing fiber sheet are bonded together. This can be solved by increasing the density as appropriate according to the press or thermal calendar conditions.
• the air permeability measured by the method based on the JAPAN TAPPI paper pulp test method is increased in the range in which the air permeability can be maintained at 200 seconds or less. It is preferable.
• the strength aspect ratio of the nonwoven fabric sheet affects the physical properties of the reinforced fiber plastic body because the nonwoven fabric sheet melts after heating and pressure molding and is integrated with the reinforcing fiber when the nonwoven fabric sheet does not contain the reinforcing fiber. There is almost no.
• the non-woven sheet contains chopped strands of reinforcing fibers
• the strength aspect ratio becomes strong
• the orientation of the reinforcing fibers also becomes strong in the MD direction. Therefore, the obtained fiber reinforced plastic body also has a high strength in the MD direction.
• the CD direction tends to be weak.
• the direction in which the reinforcing fiber plastic is particularly excellent in strength can be adjusted by the strength aspect ratio of the nonwoven sheet.
• the sheet for a fiber-reinforced plastic molded body of the present invention may be a single sheet or laminated to a desired thickness and heat-press molded with a hot press, pre-heated with an infrared heater or the like, and heated with a mold.
• a fiber reinforced plastic excellent in strength and flame retardancy can be obtained.
• the non-woven sheet containing the super engineering plastic fiber used for the fiber-reinforced plastic molded sheet of the present invention is a non-woven sheet that also contains chopped strands of reinforcing fibers
• the non-woven sheet is not bonded to the reinforcing fiber sheet.
• the sheet can be made into a fiber-reinforced plastic body even if it is heated and pressed only with a non-woven sheet.
• a fiber reinforced plastic body is formed by heating and pressing a non-woven sheet containing chopped strands of highly heat-resistant organic fibers as reinforcing fibers, chopped strands of super engineering plastic fibers as matrix resin fiber components, and a binder. It is also a sheet that can be.
• the fiber reinforced plastic body formed from a nonwoven sheet made of organic fibers such as aramid fibers is excellent in abrasion resistance, and even if shavings are generated due to abrasion, the shavings of organic fibers are as small as inorganic fibers. Since it is not hard, it has the feature that the shavings hardly damage other things. Therefore, it is suitable as a member of a machine or the like that polishes an object to be polished that requires high-precision polishing in which minute scratches are also a problem.
• the property as a fiber reinforced plastic body formed only by such a nonwoven sheet is a fiber reinforced product obtained by heating and pressing the stampable sheet of the present invention formed by bonding the nonwoven sheet to the reinforcing fiber sheet. It also has a plastic body.
• Production Example 1 PPS fibers having a fiber diameter shown in Table 1 (manufactured by Fiber Innovation Technology, fiber length 13 mm, critical oxygen index 41) were put into water. The amount of water added was 200 times that of PPS fibers (fiber slurry concentration 0.5%).
• “Emanon 3199” Kelco Corporation, trade name
• Granular polyvinyl alcohol (PVA) (Unitika Ltd., trade name “OV-N”) was added to water so as to have a concentration of 10%, and stirred to prepare a binder slurry.
• the granular PVA slurry was put into the fiber slurry, a wet web was formed by wet papermaking, and heated and dried at 180 ° C. to prepare a nonwoven fabric having a basis weight of 120 g / m 2 with the binder amount shown in Table 1. .
• Production Example 2 One non-woven fabric having a basis weight of 120 g / m 2 produced in the same manner as in Production Example 1 is placed above and below a carbon fiber cloth having a basis weight of 200 g / m 2 (carbon fiber cloth made by NEWS-COMPANY (without 3K plain weave coating)).
• a stampable sheet having a weight per unit area of 440 g / m 2 is obtained by heat treatment at 220 ° C. in a heat press in a time shorter than the heat press time in Production Example 1 to achieve the air permeability shown in Table 1. Obtained.
• Production Example 3 A binder slurry prepared using the same binder as in Production Example 1 is added to the PPS fiber slurry prepared in the same manner as in Production Example 1 to form a wet web by the wet papermaking method, and then heated and dried at 180 ° C. Thus, a nonwoven fabric having a basis weight of 123 g / m 2 was produced.
• One piece of this nonwoven fabric is placed above and below a carbon fiber cloth having a basis weight of 200 g / m 2 (a carbon fiber cloth manufactured by NEWS-COMPANY (without 3K plain weave coating)), and heated with a 220 ° C. hot press.
• a stampable sheet with a basis weight of 446 g / m 2 having an air permeability shown in Table 1 was obtained by pressure treatment.
• Production Example 4 One non-woven fabric having a basis weight of 120 g / m 2 produced in the same manner as in Production Example 1 is placed above and below a carbon fiber cloth having a basis weight of 200 g / m 2 (carbon fiber cloth made by NEWS-COMPANY (without 3K plain weave coating)). A stampable sheet with a weight per unit area of 440 g / m 2 is manufactured by heat treatment at 220 ° C. for a longer time than the heat press time in Production Example 1 to achieve the air permeability shown in Table 1. did.
• Production Example 5 Except for changing the PPS fiber to a PPS fiber having a fiber diameter shown in Table 1 (manufactured by KB Selen Co., Ltd., fiber length 13 mm, critical oxygen index 41), in the same manner as in Production Example 1, the basis weight is 440 g / m 2 . A stampable sheet was prepared.
• Production Example 6 The PPS fibers having the fiber diameters shown in Table 1 (manufactured by Fiber Innovation Technology, limiting oxygen index 41), and the polyetherimide (PEI) fibers having the fiber diameters shown in Table 2 (Fiber Innovation Technology, glass transition temperature 220 ° C.) A nonwoven fabric having a basis weight of 120 g / m 2 was produced in the same manner as in Production Example 1 except that the fiber length was changed to 13 mm and the limiting oxygen index was changed to 47).
• Table 1 manufactured by Fiber Innovation Technology, limiting oxygen index 41
• PEI polyetherimide
• This nonwoven fabric is placed above and below a carbon fiber cloth with a basis weight of 200 g / m 2 (carbon fiber cloth manufactured by NEWS-COMPANY (without 3K plain weave coating)), and heated and pressed with a 220 ° C hot press.
• a stampable sheet with a basis weight of 440 g / m 2 having the air permeability shown in Table 1 was produced.
• Production Example 7 One non-woven fabric with a basis weight of 120 g / m 2 produced in the same manner as in Production Example 6 above and below a carbon fiber cloth with a basis weight of 200 g / m 2 (carbon fiber cloth made by NEWS-COMPANY (without 3K plain weave coating)).
• Production Example 8 In Production Example 6, the granular PVA (Unitika Ltd., trade name “OV-N”) is changed to PET / coPET modified core-sheath binder fiber (Unitika Ltd., trade name “Melty 4080”) to form a nonwoven fabric.
• a stampable sheet of Production Example 8 was produced in the same manner as Production Example 6 except that it was used.
• Production Example 9 Put a binder slurry prepared using the same binder as in Production Example 6 into a PET fiber slurry prepared in the same manner as in Production Example 6 to form a wet web by wet papermaking, and heat dry at 180 ° C.
• a nonwoven fabric having a basis weight of 123 g / m 2 was produced with the binder addition amount shown in Table 2.
• This nonwoven fabric is placed above and below a carbon fiber cloth having a basis weight of 200 g / m 2 (a carbon fiber cloth manufactured by NEWS-COMPANY (without 3K plain weave coating)), and heated with a 220 ° C. hot press.
• a stampable sheet having a basis weight of 446 g / m 2 having an air permeability shown in Table 2 was obtained.
• PPS fiber having a fiber diameter of 27 ⁇ m manufactured by Fiber Innovation Technology, fiber length: 13 mm, critical oxygen index 41
• PPS fiber having a fiber diameter of 16 ⁇ m manufactured by Fiber Innovation Technology, fiber length: 13 mm, critical oxygen index: 41
• a wet web of PPS fibers was formed in the same manner as in Production Example 1 except that the binder-containing liquid of the type shown in Table 3 was added to one side of the wet web so that the total binder addition amount shown in Table 3 was obtained.
• the nonwoven fabric is a carbon fiber cloth having a basis weight of 200 g / m 2 (carbon fiber cloth manufactured by NEWS-COMPANY) (3K plain weave without coating))
• a basis weight of 440 g / weight described in Production Examples 10 to 15 is shown in Table 3.
• An m 2 stampable sheet was obtained.
• Production Examples 16-21 The PPS fiber (manufactured by Fiber Innovation Technology, fiber length: 13 mm, critical oxygen index 41) having a fiber diameter of 27 ⁇ m in Production Example 1 was changed to a PEI fiber (Fiber Innovation Technology, fiber length: 13 mm, critical oxygen index 41) having a fiber diameter of 15 ⁇ m.
• a wet web of PEI fibers was formed in the same manner as in Production Example 1 except that the binder-containing liquid of the type shown in Table 4 was added to one side of the wet web so that the total binder addition amount shown in Table 4 was obtained.
• a PEI fiber nonwoven fabric having a basis weight of 120 g / m 2 formed by spraying and heating and drying is used as a nonwoven fabric, and the nonwoven fabric is a carbon fiber cloth having a basis weight of 200 g / m 2 (carbon fiber cloth manufactured by NEWS-COMPANY ( 3K plain weave without coating)) up and down
• each of the binder supply surfaces on the outside is arranged one by one and subjected to heat and pressure treatment with a hot press at 220 ° C., whereby a basis weight 440 g / m described as Production Example 16 to Production Example 21 in Table 1 is obtained. 2 stampable sheets were obtained.
• a PVA aqueous solution in which “PVA117” manufactured by Kuraray was dissolved in hot water was used as the PVA aqueous solution.
• the styrene acrylic emulsion used was “GM-1000” manufactured by DIC, and the urethane emulsion used was “AP-X101” manufactured by DIC.
• the glass fiber 25 was weighed so as to be a polyetherimide (PEI) fiber 75 having a fiber diameter of 26 ⁇ m with respect to the glass fiber 25, and was put into water. The amount of water added was 200 times the total mass of glass fibers and PEI fibers (fiber slurry concentration 0.5%).
• Granular polyvinyl alcohol (PVA) (Unitika Ltd., trade name “OV-N”) was added to water so as to have a concentration of 10%, and stirred to prepare a binder slurry.
• the granular PVA slurry was added to the fiber slurry, a wet web was formed by wet papermaking, and the mixture was heated and dried at 180 ° C. to obtain a nonwoven fabric having a basis weight of 140 g / m 2 .
• One piece of this nonwoven fabric is placed above and below a carbon fiber cloth having a basis weight of 200 g / m 2 (a carbon fiber cloth manufactured by NEWS-COMPANY (without 3K plain weave coating)), and heated with a 220 ° C. hot press.
• the stampable sheet of Production Example 22 having a basis weight of 480 g / m 2 was obtained by the pressure treatment.
• granular polyvinyl alcohol (PVA) (Unitika Ltd., trade name “OV-N”) used for the nonwoven fabric in Production Example 22 was changed to PET / coPET-modified core-sheath binder fiber (Unitika Ltd., trade name “Melty”). 4080 ") except that the stampable sheet of Production Example 24 was obtained in the same manner as in Production Example 22.
• PVA polyvinyl alcohol
• the glass fiber in Production Example 22 was changed to a glass fiber having a fiber diameter of 6 ⁇ m and a fiber length of 18 mm, and a stampable sheet of Production Example 25 was obtained in the same manner as Production Example 22.
• Production Example 26 Two windings of a 280 mm wide PEI fiber sheet of the same composition as used in Production Example 17 were prepared, and one winding of a 250 mm wide carbon fiber cloth was prepared. From the top, a PEI fiber sheet, carbon The fiber cloth and the PEI fiber sheet were stacked in this order and subjected to heat and pressure treatment with a 180 ° C. heat calendar, and the obtained stampable sheet was wound around a 3-inch paper tube.
• the core-sheath binder fiber (Kuraray N-720) using modified PET (melting point: 110 ° C.) for the sheath and PET fiber for the core in the PEI fiber nonwoven fabric is shown in Table 6.
• the styrene / acrylic resin emulsion liquid was added to one side of the wet web by a spray method so as to have the addition amount shown in Table 6, and was heated and dried to have a basis weight of 120 g / m 2 .
• a stampable sheet was produced in the same manner as in Production Example 26 except that a PEI fiber nonwoven fabric was used as the nonwoven fabric.
• the handleability during the heating and pressing operation was evaluated by observing the occurrence of surface fiber scattering / dropping and the occurrence of delamination, according to the following criteria.
• Tables 1 to 6 show the bending strengths of the obtained fiber reinforced plastic bodies measured in the direction of the carbon fiber cloth and in the direction that forms an angle of 45 degrees with the fiber according to JIS K7074.
• the appearance of the obtained fiber reinforced plastic body was visually observed and evaluated according to the following criteria.
• the fiber-reinforced plastic molded sheet according to the present invention is heat-press molded as a stampable sheet so that no voids are generated, and both strength and appearance are good. It could be formed into a fiber reinforced plastic molding.
• the sheet of Production Example 3 has a large amount of granular PVA of 12% by mass, and a binder odor appeared strongly at the time of heat and pressure molding, but the evaluation as a molded body was not affected.
• the fiber diameter of the PPS resin fiber was as large as 35 ⁇ m, the PPS resin fiber partially remained and the resin plate became non-uniform.
• the sheet for a fiber-reinforced plastic molded body of the present invention is manufactured by laminating a non-woven sheet and a reinforcing fiber sheet using super engineering plastic fibers, which are fibers of a thermoplastic resin having high heat resistance and flame retardancy, as a matrix resin. Therefore, the productivity of the sheet for fiber reinforced plastic molding is high.
• the nonwoven fabric which is a matrix resin sheet
• the nonwoven fabric has a lower melting point than the matrix resin and contains a binder that is compatible with the matrix resin in the heat-melted state
• the interlayer strength is strong and the handling property is excellent, and the flexibility is high. It is useful as a stampable sheet that can be easily taken up and transported, and can easily follow a mold having a complicated shape.
• a fiber reinforced plastic molded sheet using organic fibers with high heat resistance and high strength such as para-aramid fibers as reinforcing fibers
• it is formed from a stampable sheet using inorganic fibers such as glass fibers as reinforcing fibers. It has better wear resistance than fiber reinforced plastic body, and even if part of the fiber reinforced plastic body is scraped off due to rubbing etc., there is a risk that the shavings are softer than inorganic fibers such as glass fiber and damage the object to be polished Therefore, it is useful as a member used in precision polishing equipment that requires a high degree of smoothness.

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