JP5469322B2 - Environmentally friendly thermoplastic resin composition - Google Patents

Description

  The present invention relates to an environmentally friendly thermoplastic resin composition comprising polyamide 11 resin and / or polyamide 1010 resin, polyolefin resin and / or polystyrene resin, modified polyolefin, and plant-derived filler.

Soft polyamide resins such as polyamide 11 resin, polyamide 1010 resin, and polyamide 12 resin are used alone or in combination with various functional materials (see, for example, Patent Documents 1 to 3). Since it also has durability, it has been suitably used for fluid transport tubes in automobiles.
In particular, the polyamide 11 resin and the polyamide 1010 resin are manufactured from plant-derived raw materials and are preferable from the viewpoint of environmental considerations. However, because of their high price, they are difficult to spread in a wide range of applications, and in automobiles, limited as needed. It has been used only for ranges. General-purpose resins such as polypropylene resins have been widely used as automobile-related general molded products because of their low cost.
Further, although the polyamide 11 resin and the polyamide 1010 resin are derived from plants, the amount of carbon dioxide generated in the production process is not low, and it is equal to or greater than that of general-purpose resins such as polyolefins. It is a problem about.
On the other hand, as an environmentally friendly material using a resin other than the polyamide 11 resin or the polyamide 1010 resin, for example, as in Patent Document 4, a polylactic acid resin, which is a plant-derived material, is used as a general-purpose resin like the polyamide 11 resin and the polyamide 1010 resin. It is often proposed to blend.
However, when a large amount of polylactic acid resin is blended, durability, impact resistance, flexibility and the like are insufficient. On the contrary, if the blending ratio is small, the contribution to the environment is naturally small. For this reason, a resin composition having a plant-derived ratio of 25% or more, which is the lower limit of the biomass plastic certification by the Biodegradable Plastics Study Group (BPS), and excellent in durability, impact resistance, flexibility, etc. It was difficult to provide at a cost.
JP 05-320504 A Japanese Patent Laid-Open No. 06-1000075 JP 07-053823 A JP 2006-321988 A

  The present invention is intended to solve the above-described problems, and an object thereof is to provide an environmentally friendly thermoplastic resin composition having low impact, impact resistance, flexibility, and durability. To do.

As a result of intensive studies to solve the above problems, the present inventor includes polyamide 11 resin and / or polyamide 1010 resin, polyolefin and / or polystyrene resin, modified polyolefin, plant-derived filler, and polylactic acid resin. The present inventors have found that the above-mentioned problems can be solved by a resin composition characterized by the above.
That is, the gist of the present invention is as follows.
(1) Polyamide 11 resin (A1) and / or polyamide 1010 resin (A2) 20 to 85% by mass, polyolefin resin (B) and / or polystyrene resin (C) 5 to 70% by mass, modified polyolefin (D) An environmentally friendly thermoplastic resin composition comprising 5 to 70% by mass, 5 to 70% by mass of a plant-derived filler (E), and 5 to 40% by mass of a polylactic acid resin (F).
(2) modified polyolefin (D), characterized in that it is obtained by modification of a copolymer of d styrene and / or propylene with α-olefin (1) a resin composition.
(3) The resin composition according to (1) or (2), wherein the plant-derived filler (E) is kenaf fiber.
(4) The resin composition according to any one of (1) to (3), wherein part or all of the plant-derived filler (E) is subjected to delignification treatment.
(5) The resin composition according to any one of (1) to (4), wherein the polylactic acid resin (F) is crosslinked with a peroxide and / or a (meth) acrylic acid ester compound. .
(6) A molded article obtained by molding the resin composition according to any one of (1) to ( 5 ).

  ADVANTAGE OF THE INVENTION According to this invention, the environmental consideration type thermoplastic resin composition provided with impact resistance, a softness | flexibility, and durability at low cost can be provided. By using this resin composition for parts of automobiles and electrical products, the range of use of polyamide 11 resin and polyamide 1010 resin, which are low environmental load materials, can be greatly expanded, and the industrial utility value is extremely high.

Hereinafter, the present invention will be described in detail.
The resin composition of the present invention comprises polyamide 11 resin (A1) and / or polyamide 1010 resin (A2) (hereinafter abbreviated as polyamide resin (A)), polyolefin resin (B) and / or polystyrene resin (C ), Modified polyolefin (D), plant-derived filler (E), and polylactic acid resin (F) .

In the resin composition of the present invention, as the polyamide 11 resin (A1), those having a melting point of 160 to 200 ° C. can be usually used. In the present invention, it is preferable to use a polyamide 11 resin (A1) obtained by polycondensing 11-aminoundecanoic acid using ricinoleic acid in natural castor oil collected from castor bean as a raw material. A trade name of the polyamide 11 resin (A) includes “Rilsan B” manufactured by Arkema.
In the resin composition of the present invention, it is preferable to use a polyamide 1010 resin (A2) obtained by polycondensation of sebacic acid and decanediamine using natural castor oil as a raw material. The polyamide 1010 resin (A2) used in the present invention desirably has a biomass carbon content of 50% or more measured in accordance with ASTM (D6866) in consideration of environmental load.
Content of the polyamide resin (A) in a resin composition needs to be 20-85 mass%. When the blending amount of the polyamide resin (A) is less than 20% by mass, the excellent mechanical properties may not be fully utilized, and it is insufficient in consideration of the environment.

In the resin composition of the present invention, the polyolefin resin (B) and / or the polystyrene resin (C) are blended for the purpose of reducing the production cost while maintaining the excellent mechanical properties of the polyamide resin (A). The Furthermore, the effect of reducing the amount of carbon dioxide generated in the production process can be expected.
The compounding quantity of polyolefin resin (B) and / or polystyrene resin (C) in a resin composition needs to be 5-70 mass%. When the blending amount is less than 5% by mass, a sufficient effect cannot be obtained. When the blending amount exceeds 70% by mass, the excellent mechanical properties of the polyamide resin (A) may not be fully utilized.
As polyolefin resin (B), various things, such as a polyethylene resin and a polypropylene resin, can be used. From the viewpoint of improving economic efficiency, a polyethylene resin and / or a polypropylene resin having a low raw material cost is preferable.
As the polystyrene resin (C), a polystyrene resin having a carbon dioxide generation amount (except during processing) from raw material collection to incineration is preferably 7 g / g or less.

In the resin composition of the present invention, the modified polyolefin (D) increases the compatibility between the polyamide resin (A), the polyolefin resin (B) and / or the polystyrene resin (C), and improves impact resistance. Is formulated for the purpose.
As the modified polyolefin (D), various modified polyolefins including commercially available ones can be used. Specific examples of the modified polyolefin (D), an olefin to d styrene and / or propylene and those modified copolymers of alpha-olefins (D1), main constituent of the ethylene component and / or propylene components, alpha , Β-Unsaturated carboxylic acid or its derivative (D2), α, β-unsaturated carboxylic acid or its derivative grafted to olefin polymer whose main component is ethylene component and / or propylene component And the graft polymer (D3) produced.
Among them, from the magnitude of the impact effect, those modified copolymers of ET styrene and / or propylene with α-olefin (D1) is preferred. Commercially available products include “Tuffmer” (a series of products such as modified ethylene / α-olefin copolymers) manufactured by Mitsui Chemicals.
The compounding quantity of the modified polyolefin (D) in a resin composition needs to be 5-65 mass%. When the blending amount is less than 5% by mass, sufficient effects may not be obtained, and when it exceeds 65% by mass, heat resistance may be inferior.

In the resin composition of the present invention, the plant-derived filler (E) is blended for the purpose of keeping the plant-derived degree high and improving the heat resistance of the molded product.
Any plant-derived filler can be used as the plant-derived filler (E). As the form, any form such as a fibrous form or a powder form can be used. Specific examples of the fibrous material include kenaf fiber, bamboo fiber, hemp fiber, bagasse fiber (sugar cane pomace), sugar beet pomace and the like. Specific examples of the powdery material include wood powder, bamboo powder, paper powder, and general cellulose powder. From the viewpoint of heat resistance imparting effect, it is preferable to use a fibrous material such as kenaf fiber.
It is preferable to use a plant-derived filler (E) that has been delignified. Use of a material that has not been delignified may adversely affect the appearance or durability. As the delignification treatment, a known method may be used as appropriate, but a method using a strong alkali solution such as a sodium hydroxide solution or a potassium hydroxide solution, a method of heating using sodium hydroxide and sodium sulfide, under acidic conditions And a method of treating with molybdate and hydrogen peroxide. In addition, the color development of lignin can be suppressed by further bleaching in addition to the delignification treatment.
The compounding quantity of the plant origin filler (E) in a resin composition needs to be 5-70 mass%. If the blending amount is less than 5% by mass, a sufficient heat resistance improving effect may not be obtained, and it is insufficient in consideration of the environment. When it exceeds 70 mass%, impact resistance may be reduced.

It is preferable to add polylactic acid resin (F) to the resin composition of the present invention for the purpose of reducing sink marks during molding, improving dimensional accuracy, and keeping the plant-derived ratio high.
As the polylactic acid resin (F), any of poly (L-lactic acid), poly (D-lactic acid), and a mixture or copolymer thereof can be used. From the viewpoint of heat resistance and moldability, L-lactic acid / D-lactic acid = 100/0 to 90/10 or 10/90 to 0/100 is preferred.
As polylactic acid resin (F), what uses various plants, such as corn, as a raw material can be used. In particular, it is preferable to use a polylactic acid resin in which the amount of carbon dioxide generated from raw material collection to incineration is 5 g / g or less.
Moreover, as the polylactic acid resin (F), it is preferable to use a polylactic acid resin that has been crosslinked and thickened with a peroxide and / or a (meth) acrylic acid ester compound. Thereby, the crystallinity degree at the time of shaping | molding can be improved, and the heat resistance of a molded article can be improved.
The blending amount of the polylactic acid resin (F) in the resin composition is preferably 5 to 40% by mass. If it is less than 5% by mass, a sufficient effect may not be obtained, and if it exceeds 40% by mass, flexibility, impact resistance, and durability may be inferior.

When the polylactic acid resin (F) is blended in the resin composition, the organic nucleating agent (G) is added to the resin composition for the purpose of promoting crystallization of the polylactic acid resin (F) and improving heat resistance. It is preferable to mix.
As the organic crystal nucleating agent (G), any organic compound that promotes crystallization of polylactic acid resin can be used. In view of the effect of promoting crystallization, it is particularly preferable to use one or more organic crystal nucleating agents represented by the following general formulas (1) to (3).
R ^1- (CONH-R ² ) _a (1)
[Wherein R ¹ represents a saturated or unsaturated aliphatic chain having 2 to 30 carbon atoms, a saturated or unsaturated aliphatic ring, or an aromatic ring. R ² represents an alkyl group having 1 to 18 carbon atoms, an alkenyl group having 2 to 18 carbon atoms, a cycloalkyl group or cycloalkenyl group having 3 to 12 carbon atoms, a phenyl group, a naphthyl group, an anthryl group, or a formula (a) The group represented by any one of (d) is represented. a represents an integer of 2 to 6. ]
[Wherein R ³ represents an alkyl group having 1 to 18 carbon atoms, an alkenyl group having 2 to 18 carbon atoms, an alkoxy group having 1 to 18 carbon atoms, a cycloalkyl group having 3 to 18 carbon atoms, a phenyl group, or a halogen atom. Represents an atom. l represents an integer of 1 to 5. ]
[Wherein, R ⁴ represents a linear or branched alkylene group having 1 to ⁴ carbon atoms. R ⁵ has the same meaning as R ³ described above. m represents an integer of 0 to 5. ]
[Wherein, R ⁶ has the same meaning as R ³ described above. n represents an integer of 1 to 5. ]
[Wherein, R ⁷ has the same meaning as R ⁴ described above, and R ⁸ has the same meaning as R ³ described above. o represents an integer of 0-6. ]
^{R 9 - (NHCO-R 10} ) f (2)
[Wherein R ⁹ represents a saturated or unsaturated fatty chain having 2 to 30 carbon atoms, an unsaturated alicyclic ring, or an aromatic ring. R ¹⁰ has the same meaning as R ² described above. f represents an integer of 2-6. ]
^{R 11 - (CONHNHCO-R 12} ) h (3)
[Wherein R ¹¹ represents a saturated or unsaturated fatty chain having 2 to 30 carbon atoms, an unsaturated alicyclic ring, or an aromatic ring. R ¹² has the same meaning as R ² described above. h represents an integer of 2 to 6. ]
Specific examples of the organic crystal nucleating agent (G) include N, N′-ethylenebis-12-hydroxystearic acid amide, N, N ′, N ″ -tricyclohexyl trimesic acid amide, and the like. .
The blending amount of the organic crystal nucleating agent (G) in the resin composition is preferably 0.1 to 5% by mass, and more preferably 0.5 to 3% by mass. When the blending amount is less than 0.1% by mass, the intended heat resistance cannot be obtained. When the blending amount exceeds 5% by mass, the operability at the time of kneading is lowered and it is not economically preferable. There is.

The resin composition of the present invention preferably contains a layered silicate (H) for the purpose of reducing the generation of burrs during molding.
As the layered silicate (H), various materials such as montmorillonite, layered fluorine mica (synthetic mica), talc, mica, and clay can be used, and montmorillonite and / or layered fluorine mica ( It is preferable to use synthetic mica).
The layered silicate (H) is optimally added during the polymerization of the polyamide resin (A). If this is difficult, the layered silicate (H) is converted to a quaternary ammonium salt or phosphonium salt before kneading. It is preferable to chemically modify with.
It is preferable that the compounding quantity of the layered silicate (H) in a resin composition is 0.1-25 mass%. When the blending amount is less than 0.1% by mass, a sufficient effect may not be obtained. When the blending amount exceeds 25% by mass, adverse effects such as poor fluidity during kneading / molding may be adversely affected. is there.

  In the present invention, means for mixing the polyamide resin (A), the polyolefin resin (B) and / or the polystyrene resin (C), the modified polyolefin (D), and the plant-derived filler (F) is not particularly limited. However, a melt kneading method using a uniaxial or biaxial extruder can be mentioned. In order to improve the kneading state, it is preferable to use a twin screw extruder. The kneading temperature is preferably in the range of (melting point of polyamide resin + 5 ° C.) to (melting point of polyamide resin + 100 ° C.), and the kneading time is preferably from 20 seconds to 30 minutes. When the temperature is lower than this range or for a short time, kneading or reaction becomes insufficient. On the other hand, when the temperature is high or for a long time, the resin may be decomposed or colored.

  A flame retardant, a pigment, a heat stabilizer, an antioxidant, a weathering agent, a plasticizer, a lubricant, a release agent, an antistatic agent, etc. should be added to the resin composition of the present invention as long as the properties are not significantly impaired. Can do. Although it does not specifically limit as a flame retardant, For example, a phosphorus flame retardant, a metal hydroxide, etc. are mentioned. Examples of heat stabilizers and antioxidants include hindered phenols, hindered amines, sulfur compounds, copper compounds, alkali metal halides, and the like. In addition, the method of mixing these with the thermoplastic resin composition of this invention is not specifically limited.

  The resin composition of the present invention can be formed into various molded products by molding methods such as injection molding, blow molding, extrusion molding, inflation molding, and vacuum molding, pressure molding, and vacuum / pressure molding after sheet processing. In particular, it is preferable to adopt an injection molding method, and in addition to a general injection molding method, gas injection molding, injection press molding, and the like can be employed. As an example of injection molding conditions suitable for the resin composition of the present invention, the cylinder temperature is not less than the melting point or flow start temperature of the resin composition, preferably 190 to 270 ° C., and the mold temperature is that of the resin composition. (Melting point-20 ° C.) or less is appropriate. If the molding temperature is too low, the operability becomes unstable, such as short-circuiting in the molded product, and overload tends to occur. Conversely, if the molding temperature is too high, the resin composition will decompose and the resulting molded product Problems such as reduction in strength and coloration are likely to occur, and both may be undesirable.

Specific examples of molded articles using the resin composition of the present invention include bumper, instrument panel, console box, garnish, door trim, ceiling, floor, engine resin parts for automobiles, various parts around PC And housings, mobile phone parts and housings, and other resin parts for electrical appliances such as OA equipment parts. Moreover, it can also be set as a film, a sheet | seat, a hollow molded product, etc.
Among them, the resin composition of the present invention is particularly useful in parts that require flexibility and impact resistance.

Hereinafter, the present invention will be described more specifically with reference to examples. The measuring method used for evaluation of the resin composition of an Example and a comparative example is as follows.
(1) Bending strength, bending elastic modulus, bending breaking strain:
Measured according to ASTM D790. The bending strength is preferably 25 MPa or more, the flexural modulus is preferably 2.0 GPa or less, and the bending fracture strain is preferably more than 10%.
(2) Deflection temperature under load:
Based on ASTM D648, the heat distortion temperature was measured at a load of 0.45 MPa. The heat distortion temperature is preferably above 95 ° C.
(3) Izod impact value:
Measured according to ASTM. The Izod impact value is preferably above 130 J / m.
(4) Humidity heat breaking strain retention:
The ratio of the bending fracture strain after standing for 20 days in an environment of 60 ° C. and 95% to the value before standing was used. It is preferable that the breaking strain retention at wet heat is 85% or more.
(5) Appearance:
The color tone of the test piece was measured with a Hunter Lab color system.
(6) Plant-derived ratio:
The ratio of the total amount of the polyamide resin (A), the plant-derived filler (E), and the polylactic acid resin (F) in the resin composition was defined as the plant-derived ratio.
(7) Biomass plastic:
The case where the plant-derived ratio was 25% or more, which is the lower limit of the BPS biomass plastic certification, was marked with ◯, and the case where this ratio was not satisfied was marked with ×.

Moreover, the various raw materials used for the Example and the comparative example are as follows.
(1) Polyamide resin (A)
・ Polyamide 11 resin (A1): “Rilsan B” made by Arkema
Polyamide 1010 resin (A2):
100 parts by mass of sebacic acid (manufactured by Toyokuni Oil) was dissolved in hot methanol with stirring. Next, 85 parts by mass of decamethylenediamine (manufactured by Ogura Synthesis Co., Ltd.) was dissolved in methanol and slowly added to the previous methanol solution of sebacic acid. After all the components were added, the mixture was stirred for about 15 minutes, and the precipitate was filtered and washed with methanol to obtain decamethylene diammonium sebacate.
Next, 100 parts by mass of decamethylene diammonium sebacate and 33 parts by mass of water were charged into an autoclave, and after substitution with nitrogen, heating was started while stirring at a preset temperature of 240 ° C. and 25 rpm. After holding at a pressure of 2 MPa for 2 hours, the water vapor was exhausted and the pressure was reduced to normal pressure. The mixture was stirred at normal pressure to 0.02 MPa for 2 to 3 hours, then left to stand for 1 hour and then discharged. Then, it dried under reduced pressure and obtained polyamide 1010 resin.
(2) Polyolefin resin (B):
・ Nippon Polyethylene Polyethylene “NOVATEC HD-HB111R” (hereinafter referred to as “PE”)
・ Nippon Polychem Polypropylene "NOVATEC PP-MA1B"
(3) Polystyrene resin (C):
PS Japan polystyrene "HH203"
(4) Modified polyolefin (D):
・ Mitsui Chemicals modified ethylene / α-olefin copolymer “Tuffmer TX1250” (hereinafter referred to as “Tuffmer”)
・ Maleic anhydride modified PE
Using a twin screw extruder (TEM37BS type manufactured by Toshiba Machine Co., Ltd.), 90 parts by weight of PE and 10 parts by weight of maleic anhydride are supplied from the root supply port of the extruder, barrel temperature is 180 ° C., screw speed is 280 rpm, discharge is 15 kg / h. Extrusion was performed while venting was effective. Further, 0.2 part by mass of peroxide perbutyl D (manufactured by NOF Corporation) was supplied into the cylinder. The resin discharged from the tip of the extruder was cut into pellets. The obtained pellets were vacuum-dried at 70 ° C. for 24 hours to obtain maleic anhydride-modified PE.
(5) Plant-derived filler:
・ Kenaf fiber ・ Delignined kenaf fiber (Kenaf fiber from which lignin has been removed by applying pressure and heat treatment using sodium hydroxide solution)
(6) Polylactic acid resin (F):
・ Nature Works polylactic acid "6201D"
・ Crosslinked thickening PLA
Using a twin-screw extruder (TEM37BS type manufactured by Toshiba Machine Co., Ltd.), supplying 6201D100 parts by mass from the root supply port of the extruder, venting is effective under the conditions of barrel temperature 180 ° C., screw rotation speed 280 rpm, discharge 15 kg / h. The extrusion was carried out. Further, 0.10 parts by mass of ethylene glycol dimethacrylate and 0.2 parts by mass of perbutyl D were supplied into the cylinder. The resin discharged from the tip of the extruder was cut into pellets. The obtained pellets were vacuum dried at 70 ° C. for 24 hours to obtain a crosslinked thickened PLA.
(7) Organic crystal nucleating agent (G):
N, N ′, N ″ -tricyclohexyltrimesic acid amide (“TF-1” manufactured by Shin Nippon Chemical Co., Ltd.) (8) Layered silicate (H):
Montmorillonite chemically modified with quaternary ammonium salt ("Kunipia F" manufactured by Kunimine Industries)

Reference example 1
Using a twin-screw extruder (Ikegai PCM30 type), 45 parts by mass of polyamide 11 resin, 25 parts by mass of PE, 10 parts by mass of maleic anhydride-modified PE, and 20 parts by mass of kenaf fiber are dry blended and supplied from the root supply port of the extruder. Then, extrusion was performed while venting was effective under the conditions of a barrel temperature of 240 ° C., a screw rotation speed of 230 rpm, and a discharge rate of 5 kg / h. The resin discharged from the tip of the extruder was cut into pellets to obtain pellets of the resin composition.
The obtained pellets were vacuum dried at 90 ° C. for 24 hours, and then a test piece for measuring general physical properties (ASTM) while adjusting the mold surface temperature to 85 ° C. using an IS-80G injection molding machine manufactured by Toshiba Machine Co., Ltd. Mold), were subjected to various measurements, and the average burr length at the center of the test piece was measured. Separately, a 4 × 6 inch × 10 mm thick plate was similarly formed, and after cooling, the depth of sink marks in the central portion was measured. Furthermore, the appearance of the molded test piece was also evaluated.

Examples 7-8, 11, 13-15, Reference Examples 2-10 , and Comparative Examples 1-9
Resin composition pellets were treated in the same manner as in Reference Example 1 except that the types and amounts of polyamide resin, polyolefin resin, polystyrene resin, modified polyolefin, plant-derived filler, polylactic acid resin, organic crystal nucleating agent, and layered silicate were changed. Prepared, molded and evaluated.

The evaluation results of Examples 7 to 8, 11, 13 to 15, Reference Examples 2 to 10 , and Comparative Examples 1 to 9 are collectively shown in Tables 1 and 2.

As apparent from Tables 1 and 2, in Examples 7 to 8 , 11 , and 13 to 15 , the content of the expensive polyamide resin (A) is kept low, and the impact resistance and heat resistance are extremely high. It has been found that a resin composition that is suitable for biomass plastics can be obtained.
Moreover, in Examples 7-8 , 11 , and 13-15 , since the toughmer that is a modified ethylene / α-olefin copolymer was used as the modified polyolefin, molding having excellent impact resistance as compared with Reference Example 1 was performed. Goods were obtained.
In Example 7～8,11, as a plant-derived filler, because using the delignification kenaf fibers, Reference Examples 1-2, 10, as compared with Example 13 to 15, obtained molded article excellent appearance It was.
In Examples 7 to 8, 11, and 13 to 15, since an appropriate amount of polylactic acid resin was blended, a molded product with a low degree of sink and high dimensional accuracy was obtained, and flexibility, impact resistance, and moisture resistance were obtained. Also in terms of heat, more favorable results were obtained as compared with Reference Example 8 in which the polylactic acid resin content was large. Furthermore, among them, in Examples 8, 11, 14, and 15, since a crosslinked and thickened PLA was used as the polylactic acid resin, a molded product having more excellent heat resistance was obtained. In No. 15, a molded product with extremely excellent heat resistance was obtained by blending an organic crystal nucleating agent. However, in Reference Example 7 , since the blending amount of the polylactic acid resin was small, the effect could not be obtained.
Moreover, in Reference Example 9 , since a layered silicate was blended, a molded product with a low degree of burr was obtained.
In Reference Example 10 , the polyamide 1010 resin (A2) was used as the polyamide resin (A), but the same results as in Reference Example 2 were obtained.

  In contrast to the above examples, Comparative Example 1 is significantly disadvantageous economically because the content of the polyamide resin (A) is high. In Comparative Examples 2 and 4, the impact resistance is inferior and environmental considerations are not made. In Comparative Example 3, consideration was given to the environment to some extent, and since the polyamide resin (A) was not used, the results were inferior in impact resistance. In Comparative Example 5, since the blending amount of the polyamide resin (A) is small, it is inferior in impact resistance and flexibility, and does not correspond to biomass plastic. In Comparative Example 6, no plant-derived filler is blended, resulting in poor heat resistance. In Comparative Example 7, the amount of plant-derived filler is large, resulting in poor flexibility and impact resistance. It was. In Comparative Example 8, since the modified polyolefin was not blended, the impact resistance was inferior, and in Comparative Example 9, the blended amount of the modified polyolefin was large, resulting in poor heat resistance.

Claims (6)

Polyamide 11 resin (A1) and / or polyamide 1010 resin (A2) 20 to 85% by mass, polyolefin resin (B) and / or polystyrene resin (C) 5 to 70% by mass, and modified polyolefin (D) 5 to 70 An environmentally friendly thermoplastic resin composition comprising 5% by mass, 5 to 70% by mass of a plant-derived filler (E), and 5 to 40% by mass of a polylactic acid resin (F). Modified polyolefin (D) is d styrene and / or propylene with α resin composition according to claim 1, wherein a is obtained by modifying a copolymer of an olefin. The resin composition according to claim 1 or 2, wherein the plant-derived filler (E) is kenaf fiber. The resin composition according to any one of claims 1 to 3, wherein a part or all of the plant-derived filler (E) is subjected to delignification treatment. 5. The resin composition according to claim 1, wherein the polylactic acid resin (F) is crosslinked with a peroxide and / or a (meth) acrylic acid ester compound. The molded object formed by shape | molding the resin composition in any one of Claims 1-5 .