JP5223303B2 - Profile extrusion molding - Google Patents

Description

  The present invention relates to a polylactic acid resin composition and a molded product comprising the same, and more particularly to a polylactic acid resin composition having excellent moldability and excellent product appearance and a molded product comprising the same.

  Recently, biodegradable polymers that are decomposed in the natural environment by the action of microorganisms existing in the soil and water have attracted attention from the viewpoint of global environmental conservation, and various biodegradable polymers have been developed. Among these, as a biodegradable polymer that can be melt-molded, for example, polyethylene comprising an aliphatic dicarboxylic acid component such as polyhydroxybutyrate, polycaprolactone, succinic acid or adipic acid and a glycol component such as ethylene glycol or butanediol. Aliphatic polyesters such as succinate, polybutylene adipate and polylactic acid are known.

  Among these aliphatic polyesters, polylactic acid can be produced at low cost by fermentation using microorganisms, using lactic acid as a raw material for lactic acid as a raw material, and has a melting point as high as about 170 ° C. It is expected to be a versatile biopolymer that can be used.

  On the other hand, in order to be widely deployed in the market, in addition to processing methods represented by injection molding, compression molding, blow molding, foam molding, laminate molding, etc., stable workability in extrusion molding is required. It is.

  However, just using the polylactic acid resin obtained by polymerization as it is, the viscosity at the time of melting is low, it draws down at the time of extrusion molding, stable workability cannot be obtained, and it is a big problem to expand to the market widely Therefore, a polylactic acid resin composition excellent in extrusion moldability has been desired.

  On the other hand, in Patent Document 1 and Patent Document 2, it is possible to develop stable processability by blending a polylactic acid resin with a reactive thickener for polylactic acid and an acrylic polymer. Although described, depending on the processing method, the surface of the molded product is in a cracked state, and there is a problem that the completeness as a product is still insufficient.

Patent Document 3 describes that a polylactic acid resin composition having both excellent appearance and processability can be obtained by blending a polylactic acid resin and polymethylmethacrylate. There has been a problem that the viscosity is low and draw-down occurs, and stable processability cannot be obtained, and a highly complete polylactic acid resin composition having both excellent extrudability and appearance has been demanded.
JP 2006-193541 A JP 2006-45487 A JP 2006-328368 A

  The present invention has been achieved as a result of diligent studies for the purpose of solving the above problems, and has an excellent polylactic acid resin composition having excellent moldability and excellent product appearance, and a molded product comprising the same. Challenge to provide.

The present invention employs the following means in order to solve such problems.
That is,
(1) (A) 0.01 to 5 parts by weight of at least one selected from polyethylene glycol and polypropylene glycol having a weight average molecular weight of 4000 to 20,000 with respect to 100 parts by weight of polylactic acid resin, and ( C) A profile extrusion-molded product comprising a polylactic acid resin composition comprising 0.1 to 3 parts by weight of a styrene / acrylic copolymer having an epoxy group.
(2) the polylactic acid melt flow rate of the resin composition temperature 190 ° C., consisting of 0.1 to 4 (g / 10 min) der Lupo polylactic acid resin composition under a load 2160 g (1), wherein the profile extrusion Molded product .
It is.

  The present invention can provide a polylactic acid resin composition having both excellent moldability and excellent product appearance, and a molded product comprising the same.

  The polylactic acid resin (A) used in the present invention is a polymer having L-lactic acid and / or D-lactic acid as a main constituent, but other than lactic acid as long as the object of the present invention is not impaired. A copolymerization component may be included.

  Examples of such other copolymer component units include polyvalent carboxylic acids, polyhydric alcohols, hydroxycarboxylic acids, lactones, and the like. Specifically, oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid , Azelaic acid, sebacic acid, dodecanedioic acid, fumaric acid, cyclohexanedicarboxylic acid, terephthalic acid, isophthalic acid, phthalic acid, 2,6-naphthalenedicarboxylic acid, 5-sodium sulfoisophthalic acid, 5-tetrabutylphosphonium sulfoisophthalic acid Polyhydric carboxylic acids such as ethylene glycol, propylene glycol, butanediol, heptanediol, hexanediol, octanediol, nonanediol, decanediol, 1,4-cyclohexanedimethanol, neopentyl glycol, glycerin, trimethyl Propanediol, pentaerythritol, bisphenol A, aromatic polyhydric alcohols obtained by addition reaction of ethylene oxide with bisphenol, polyhydric alcohols such as diethylene glycol, triethylene glycol, polyethylene glycol, polypropylene glycol, polytetramethylene glycol, glycolic acid, Hydroxycarboxylic acids such as 3-hydroxybutyric acid, 4-hydroxybutyric acid, 4-hydroxyvaleric acid, 6-hydroxycaproic acid, hydroxybenzoic acid, glycolide, ε-caprolactone glycolide, ε-caprolactone, β-propiolactone, δ- Lactones such as butyrolactone, β- or γ-butyrolactone, pivalolactone, and δ-valerolactone can be used. These copolymer components can be used alone or in combination of two or more.

  (A) Although the molecular weight and molecular weight distribution of a polylactic acid resin are not specifically limited, It is good that it is 80000-300000 as a weight average molecular weight.

  If the molecular weight is 80,000 or less, the melt viscosity as an extrusion molding process is too low to be suitable for processing. Conversely, if it is 300,000 or more, the efficiency at the time of polymerization is lowered, the cost is increased, and it is not general.

  The weight average molecular weight herein is a weight average molecular weight in terms of polymethyl methacrylate (PMMA) measured by gel permeation chromatography (GPC) using hexafluoroisopropanol as a solvent.

  (A) Melting | fusing point of polylactic acid resin is not specifically limited, It is preferable that it is 90 degreeC or more, and it is more preferable that it is 150 degreeC or more.

  In the present invention, the (A) polylactic acid resin preferably has a high optical purity of the lactic acid component in order to obtain high heat resistance, and the total lactic acid component contains 80% or more of the L isomer or the D isomer. 80% or more is preferably contained, L-form is contained 90% or more, or D-form is more preferably contained 90% or more, L-form is contained 95% or more, or D-form is contained 95% or more. It is particularly preferable that the L-form is contained in 98% or more or the D-form is contained in 98% or more. Moreover, the upper limit of the content of L-form or D-form is usually 100% or less. Furthermore, it is preferable to use together polylactic acid containing 80% or more of L-form and polylactic acid containing 80% or more of D-form from the point that the melting point is further improved.

  (A) As a manufacturing method of a polylactic acid resin, a known polymerization method can be used, and a direct polymerization method from lactic acid, a ring-opening polymerization method via lactide, or the like can be employed.

  In the present invention, (B) polyethylene glycol or polypropylene glycol having a weight average molecular weight of 4000 to 20000 is used.

  By blending polyethylene glycol or polypropylene glycol having a weight average molecular weight of 4000 or more, the viscosity at the time of melting at the time of extrusion can be controlled to such an extent that it does not draw down, and stable when molding a polylactic acid resin composition You can pick up. Moreover, when performing profile extrusion, after passing a metal mold | die, the thing of the stable product shape can be obtained and the molded article excellent in dimensional stability can be obtained.

  Moreover, it is preferable to mix | blend polyethylene glycol or polypropylene glycol with a weight molecular weight of 20000 or less from the point of compatibility of polylactic acid resin, and when it is set as a molded article, the product appearance with a smooth surface can be obtained.

  Representative commercially available products include Pluronic F68 (manufactured by ADEKA Corporation), PEG-6000 (manufactured by LION Corporation), and the like.

  (B) The compounding quantity of the polyethylene glycol and polypropylene glycol whose weight average molecular weight is 4000-20000 is 0.01-5 weight part with respect to 100 weight part of (A) polylactic acid resin. If it is less than 0.01 part by weight, the effect of improving the appearance of the product when formed into a molded product is insufficient, and if it exceeds 5 parts by weight, stable processability cannot be obtained.

  Here, the weight average molecular weight of polyethylene glycol and polypropylene glycol is a weight average molecular weight in terms of standard polyethylene glycol measured by gel permeation chromatography (GPC) using dimethylformacid as a solvent.

  In the present invention, it is important to further blend (C) a styrene / acrylic copolymer having an epoxy group.

  (C) The styrene / acrylic copolymer having an epoxy group is a polymer in which an epoxy group is introduced into the main chain or side chain in styrene and acrylic molecules.

  The weight average molecular weight of the (C) styrene / acrylic copolymer having an epoxy group is preferably 1000 to 300000, and more preferably 5000 to 250,000, from the viewpoint that bleeding out can be suppressed.

  In the present invention, the glass transition temperature of the styrene / acrylic copolymer (C) having an epoxy group is not particularly limited, but is preferably 30 to 70 ° C, more preferably 40 to 70 ° C. .

  The (C) styrene / acrylic copolymer having an epoxy group used in the present invention usually contains a volatile component because unreacted raw material monomers and solvents remain. The amount of the non-volatile component that is the balance is not particularly limited, but it is preferable that the non-volatile component amount is large from the viewpoint of suppressing the generation of gas. Specifically, it is preferably 95% by weight or more, more preferably 97% by weight or more, further preferably 98% by weight or more, and most preferably 98.5% by weight or more. preferable. In addition, the non-volatile component here represents the remaining amount ratio when the sample 10g is heated at 110 degreeC for 1 hour in nitrogen atmosphere.

  In the present invention, (C) the styrene / acrylic copolymer having an epoxy group may use a sulfur compound as a chain transfer agent (molecular weight modifier) in production in order to obtain a low molecular weight product. The resulting copolymer usually contains sulfur. Here, although sulfur content is not specifically limited, From the viewpoint of suppressing an unpleasant odor, it is preferable that the sulfur content is small. Specifically, the sulfur atom is preferably 1000 ppm or less, more preferably 100 ppm or less, further preferably 10 ppm or less, and most preferably 1 ppm or less.

  In the present invention, the glycidyl group content of the (C) epoxy group-containing styrene / acrylic copolymer is not particularly limited, but in terms of impact resistance, hydrolysis resistance, and appearance, 10 meq / g is preferable, 1-7 meq / g is more preferable, and 3-5 meq / g is further more preferable. The epoxy value here is a value measured by the hydrochloric acid-dioxane method.

  (C) The compounding quantity of the styrene / acrylic copolymer which has an epoxy group is 0.1 weight part-3 weight part with respect to 100 weight part of (A) polylactic acid. If it is less than 0.1 part by weight, the melt viscosity of the polylactic acid resin composition is low and stable processing is impossible, and if it exceeds 3 parts by weight, the production efficiency is reduced during melt-kneading. Will crack.

  The polylactic acid resin composition of the present invention comprises the above (A) polylactic acid resin, (B) polyethylene glycol having a weight average molecular weight of 4000 to 20000, polypropylene glycol, and (C) a styrene / acrylic copolymer having an epoxy group. The melt flow rate of the polylactic acid resin composition is preferably 0.1 to 4 (g / 10 minutes) at a temperature of 190 ° C. and a load of 2160 g.

  The melt flow rate here is a value measured at a temperature of 190 ° C. and a load of 2160 g using a melt indexer according to ASTM D1238 after drying the polylactic acid resin composition at 80 ° C. with a hot air circulation dryer for 5 hours. is there.

  By setting the melt flow rate to 0.1 (g / 10 min) or more, it is preferable because the viscosity at the time of melting can be within a range where stable processing can be performed at the time of extrusion molding.

  By setting the melt flow rate to 4 (g / 10 min) or less, it is preferable because a stable product shape can be obtained without drawing down, and stable take-up can be performed.

  In the present invention, other thermoplastic resins (for example, a polyethylene resin, a polypropylene resin, a polymethylpentene resin, a cyclic olefin resin, a methacrylic resin, an acrylonitrile / butanediene / styrene (ABS) resin) are within the range not impairing the object of the present invention. , Acrylonitrile / styrene (AS) resin, cellulose resin such as cellulose acetate, polyamide resin, polyacetal resin, aromatic polyester resin such as polyethylene terephthalate resin and polybutylene terephthalate resin, polycarbonate resin, polyphenylene oxide resin, polyarylate resin, polysulfone Resins, polyphenylene sulfide resins, polyether ether ketone resins, polyimide resins, polyetherimide resins, etc.) and thermosetting resins (eg Knoll resin, melamine resin, polyester resin, silicone resin, epoxy resin, etc.) and soft thermoplastic resin (for example, ethylene / glycidyl methacrylate copolymer, polyester elastomer, polyamide elastomer, ethylene / propylene terpolymer, ethylene / butene-1 copolymer) 1 or more types such as coalescence) can be further contained.

  In the resin composition of the present invention, a stabilizer, a lubricant, a release agent, a flame retardant, a colorant including a dye and a pigment, an antistatic agent, and the like may be added within a range not impairing the object of the present invention. it can. Especially, it is preferable to mix | blend a stabilizer and a mold release agent from the point that the resin composition excellent in mechanical characteristics, a moldability, heat resistance, etc. is obtained.

  As a stabilizer, what is normally used for the stabilizer of a thermoplastic resin can be used. Specific examples include antioxidants and light stabilizers. By blending these, a resin composition excellent in mechanical properties, moldability, heat resistance and durability can be obtained.

  Examples of the antioxidant used in the present invention include hindered phenol compounds, phosphite compounds, thioether compounds, and the like.

  Examples of the light stabilizer used in the present invention include benzophenone compounds, benzotriazole compounds, aromatic benzoate compounds, oxalic acid anilide compounds, cyanoacrylate compounds and hindered amine compounds.

  In the present invention, the stabilizer may be used alone or in combination of two or more. Moreover, it is preferable to use a hindered phenol compound and / or a benzotriazole compound as the stabilizer.

  0.01-3 weight part is preferable with respect to 100 weight part of (A) polylactic acid resin, and, as for the compounding quantity of a stabilizer, 0.03-2 weight part is further more preferable.

  As the mold release agent, those usually used for mold release agents for thermoplastic resins can be used. Specifically, fatty acids, fatty acid metal salts, oxy fatty acids, fatty acid esters, partially aliphatic saponified esters, paraffin, low molecular weight polyolefins, fatty acid amides, alkylene bis fatty acid amides, aliphatic ketones, fatty acid lower alcohol esters, fatty acid polyhydric alcohols Examples thereof include esters, fatty acid polyglycol esters, and modified silicones. 0.01-3 weight part is preferable with respect to 100 weight part of (A) polylactic acid resin, and, as for the compounding quantity of a mold release agent, 0.03-2 weight part is further more preferable.

  The method for producing the polylactic acid resin composition of the present invention is not particularly limited. For example, (A) polylactic acid resin, (B) polyethylene glycol having a weight average molecular weight of 4000 to 20000, polypropylene glycol, and (C ) In addition to the epoxy group-containing acrylic / styrene copolymer, if necessary, other additives such as crystal nucleating agent, plasticizer, filler, etc. are pre-blended, and then above the melting point, using a single or twin screw extruder The method of uniformly melting and kneading and the method of removing the solvent after mixing in a solution are preferably used, but from the viewpoint of productivity, the method of uniformly melting and kneading with a single-screw or twin-screw extruder is preferred, and the solution is uniformly melted. From the viewpoint of kneading, a twin screw extruder is more preferable.

  In the present invention, the obtained polylactic acid resin composition can be molded by any method such as generally known extrusion molding, profile extrusion molding, blow molding, compression molding, calendar molding, etc. Can be widely used.

  Molded products include films, sheets, fibers / clothes, non-woven fabrics, injection molded products, extrusion molded products, vacuum / pressure molded products, blow molded products, or composites with other materials. It can be used for electronic equipment materials, agricultural materials, horticultural materials, fishery materials, civil engineering / architectural materials, stationery, daily necessities, household goods, medical / hygiene products, and other various uses.

  Automotive parts (interior / exterior parts, etc.), electrical / electronic parts (various housings, gears, gears, etc.), building materials, civil engineering materials, furniture materials, agricultural materials, game machine materials, tableware, sports materials, musical instruments and daily necessities It can be used for applications.

  Specifically, automotive parts include air flow meters, air pumps, thermostat housings, engine mounts, ignition hobbins, ignition cases, clutch bobbins, sensor housings, idle speed control valves, vacuum switching valves, ECU housings, vacuum pump cases, inhibitors Switch, rotation sensor, acceleration sensor, distributor cap, coil base, ABS actuator case, radiator tank top and bottom, cooling fan, fan shroud, engine cover, cylinder head cover, oil cap, oil pan, oil filter, fuel cap , Fuel strainer, distributor cap, vapor Nister housing, air cleaner housing, timing belt cover, brake booster parts, various cases, various tubes, various tanks, various hoses, various clips, various valves, various pipes such as automotive underhood parts, torque control lever, safety belt Parts, register blade, washer lever, window regulator handle, knob of window regulator handle, passing light lever, sun visor bracket, door trim, door pocket, column cover, cowl side, footrest deck trim, front pillar, center pillar, front scuff, Rear scuff, door cuff, front outside, rear outside, seat side, roof side, striker, air Automotive interior parts such as concases, cassette deck cases, various motor housings, roof rails, fenders, garnishes, bumpers, door mirror stays, spoilers, hood louvers, wheel covers, wheel caps, grill apron cover frames, lamp reflectors, lamp bezels, Various automotive connectors such as exterior parts for automobiles such as door handles, wire harness connectors, SMJ connectors, PCB connectors, and door grommet connectors. Electrical and electronic components include notebook PC housings and internal parts, CRT display housings and internal parts, printer housings and internal parts, mobile terminal housings and internal parts such as mobile phones, mobile PCs, handheld mobiles, recording media (CD, (DVD, PD, FDD, etc.) Drive housing and internal parts, copier housing and internal parts, facsimile housing and internal parts, parabolic antennas, and other electric / electronic parts. Furthermore, audio equipment parts such as VTR parts, TV parts, irons, hair dryers, rice cooker parts, microwave oven parts, acoustic parts, video cameras, audio / laser disks (registered trademark) / compact disks, lighting parts, refrigerator parts, Household and office electrical product parts represented by air conditioner parts, typewriter parts, word processor parts, etc., housings and internal parts of electronic musical instruments, home game machines, portable game machines, various gears, various cases, sensors, connectors , Sockets, resistors, relay cases, motor cases, switches, capacitors, variable capacitor cases, oscillators, various terminal boards, transformers, plugs, printed wiring boards, tuners, speakers, microphones, headphones, small motors, magnetic head bases, Power module, Conductor, liquid crystal, FDD carriage, FDD chassis, motor brush holders, transformer members and coil bobbins and the like. Building materials include sash doors, blind curtain parts, piping joints, curtain liners, blind parts, gas meter parts, water meter parts, water heater parts, roof panels, heat insulation walls, adjusters, plastic bundles, ceiling hanger, stairs, doors, floors Materials, ceiling materials, pillars, foundations, beams, baseboards, window frames, doors, deck materials, etc. Civil engineering materials include vegetation nets, vegetation mats, grass protection bags, grass protection nets, curing sheets, slope protection sheets, fly ash holding sheets, drain sheets, water retention sheets, sludge / sludge dewatering bags, concrete formwork, scaffolding boards , Sheet piles, and piles. Examples of furniture members include a chest, a desk, a chair, and various shelves. Examples of the material for the gaming machine include pachinko parts such as a pachinko machine gauge board and a frame material, and parts such as a mahjong table and a billiard table. Others include fishing lines, fishing nets, seaweed aquaculture nets, fishing bait bags, simulated bait, seafood and other fishery related materials, gears, screws, springs, bearings, levers, key stems, cams, ratchets, rollers, water supply parts, toy parts, Fans, pipes, cleaning jigs, motor parts, microscopes, binoculars, cameras, watches and other mechanical parts, multi-films, tunnel films, bird protection sheets, vegetation protection nonwoven fabrics, seedling pots, vegetation piles, seed string tape , Germination sheet, house lining sheet, agricultural PVC film stopper, slow-release fertilizer, root-proof sheet, garden net, insect net, young tree net, print laminate, fertilizer bag, sample bag, sandbag, animal damage Agricultural materials such as prevention nets, incentive straps, windproof nets, sanitary products such as disposable diapers, sanitary wrapping materials, cotton swabs, towels, and toilet seat wipes, non-woven fabrics for medical use (stitching reinforcement, adhesion prevention) , Prosthetic repair material), wound dressing material, wound tape bandage, sticker base fabric, surgical suture, fracture reinforcement, medical film, medical supplies, tray, knife, fork, spoon, tube, plastic can, Blisters, pouches, pallets, containers, tanks, baskets, beverage bottles, cups, containers such as fruit baskets, hot fill containers, microwave cooking containers cosmetic containers, food packaging films, wraps, Paper laminates, shampoo bottles, candy packaging, shrink labels, lid materials, envelopes with windows, hand cut tape, easy peel packaging, egg packs, HDD packaging, compost bags, recording media packaging, shopping bags, electrical / electronic parts, etc. Packaging materials such as wrapping film, buffer, curtains, chairs, carpets, tablecloths Interior items such as sportswear, futon mats, wallpaper, various sports materials, musical instruments, clothing, credit cards, cash cards, ID cards, IC cards, carrier tapes, printed tapes, thermal stencil printing films, release films, porosity Useful as film, conductive embossed tape, IC tray, tea pack, drainage filter, bag, golf tee, toothbrush, stationery, clear file, cooler box, kumade, hose reel, planter, hose nozzle, pen cap, gas lighter, etc. It is.

  Examples of the profile extrusion molding obtained by profile extrusion molding include window frames, hollow plate materials, gutters, calendar clips, calendar holders and the like.

Hereinafter, the configuration and effects of the present invention will be described in more detail by way of examples. Here, the compounding ratio in an Example shows a weight part. Moreover, the raw material used and the code | symbol in a table | surface are shown below.
(A) Polylactic acid resin (A-1) Polylactic acid resin (D-form 1.2%, weight average molecular weight (PMMA conversion) 210,000)
(B) Polyethylene glycol having a weight average molecular weight of 4000 to 20000, polypropylene glycol, and other components (B-1) Pluronic F68 (manufactured by ADEKA Corporation, weight average molecular weight 8400)
(B-2) PEG-6000 (LION Co., Ltd., weight average molecular weight 6000)
(B-3) DAIFACTY-101 (manufactured by Daihachi Chemical Industry Co., Ltd., adipic acid ester)
(C) Epoxy group-containing acrylic / styrene copolymer, other components (C-1) “JONCRYL” ADR-4368 (manufactured by BASF, weight average molecular weight 6800, nonvolatile component amount 98.7% by weight)
(C-2) “ARUFON” UG4040 (manufactured by Toagosei, weight average molecular weight 10,000, epoxy value 1.8 meq / g)
(C-3) Carbodilite HMV-8CA (Carbodiimide manufactured by Nisshinbo Industries, Ltd.)

  The measurement method and determination method used in the present invention are shown below.

(1) Weight average molecular weight (Mw)
It is a value of weight average molecular weight in terms of standard PMMA measured by gel permeation chromatography (GPC). Hexafluoroisopropanol was used as a solvent, the flow rate was 0.5 mL / min, and 0.1 mL of a solution having a sample concentration of 1 mg / mL was injected and measured.

  Polyethylene glycol and polypropylene glycol are weight average molecular weight values in terms of standard polyethylene glycol, and were evaluated by the same measurement method except that dimethylformacid was used as a solvent.

(2) Melt Fool Rate After dry blending according to the blending ratio shown in Table 1, using a twin screw extruder (φ60 mm), melt kneading at a cylinder temperature of 260 ° C., a screw speed of 200 rpm, and a discharge rate of 60 kg / h, A pellet-shaped polylactic acid resin composition was obtained.

  In order to suppress hydrolysis, the polylactic acid resin composition obtained by the above melt-kneading was dried with a hot air circulation dryer at 80 ° C. for 5 hours, and then a melt indexer was used at a temperature of 190 ° C. according to ASTM D1238. Measurement was performed at a load of 2160 g.

(3) Extrusion processability In order to suppress hydrolysis, the pellets obtained by the above melt-kneading were dried with a hot air circulating dryer at 80 ° C for 5 hours, and then a φ40mm single screw extruder, cylinder temperature 260 ° C, mold If stable processing is possible by passing through a die that is a U-shaped product with a temperature of 80 ° C, a screw speed of 30 rpm, a take-up speed of 10 m / h, a side of 20 mm, and a wall thickness of 1 mm, stable processing is possible. When it was not possible, it was set as x and the extrusion processability was confirmed.

(4) Arithmetic average surface roughness The molded product obtained by the extrusion process was cut into a width of 20 mm and a length of 10 mm, and the arithmetic average roughness of the molded product was evaluated using “SURFTEST 500” manufactured by Mitutoyo Corporation. When the arithmetic average roughness is less than 1, a smooth molded product appearance is obtained.

(Examples 1-7, Comparative Examples 1-6)
After dry blending the raw materials at the blending ratios shown in Tables 1 and 2, using a twin screw extruder (φ60 mm), melt kneading at a cylinder temperature of 260 ° C., a screw rotation speed of 200 rpm, and a discharge rate of 60 kg / h, pelletized A polylactic acid resin composition was obtained.

  In order to suppress hydrolysis, the pellets obtained by the above melt-kneading were dried in a hot air circulating dryer at 80 ° C. for 5 hours, then a φ40 mm single screw extruder, a cylinder temperature of 260 ° C., a mold temperature of 80 ° C., and screw rotation The molded product was obtained by passing it through a metal mold having a square shape of 20 mm on one side and a thickness of 1 mm at several 30 rpm and a take-up speed of 10 m / h.

  Tables 1 and 2 show the results of various evaluations of the obtained resin composition and molded product.

Claims (2)

(A) 0.01 to 5 parts by weight of at least one selected from polyethylene glycol and polypropylene glycol having a weight average molecular weight of 4000 to 20000, and (C) an epoxy group with respect to 100 parts by weight of the polylactic acid resin. A profile extrusion-molded article comprising a polylactic acid resin composition comprising 0.1 to 3 parts by weight of a styrene / acrylic copolymer. The melt flow rate of the polylactic acid resin composition temperature 190 ℃, 0.1~4 (g / 10 min) under a load 2160g der Lupo consisting polylactic acid resin composition according to claim 1, wherein the profile extrusion molded article.