JP6076210B2 - Polyamide resin composition and molded article comprising the same - Google Patents

Description

  The present invention relates to a polyamide resin composition, and more particularly to a polyamide resin composition excellent in a balance between impact resistance and heat resistance, and a molded product obtained therefrom.

  Polyamide resins are expected to be in great demand as engineering plastics due to their excellent physical properties. However, polyamide resins generally do not have sufficient impact resistance, and various improvements in performance have been studied. If the impact resistance of polyamide resin can be improved, it can meet the needs in a wide range of applications from sports equipment such as sports shoes to industrial parts such as automobile parts, oil tubes, flexible tubes, and air hoses.

  As a method for improving the impact resistance such as Izod impact strength of polyamide resin, a method of blending an ethylene / α-olefin copolymer grafted with α, β-unsaturated carboxylic acid into polyamide resin has been proposed (patent) Literatures 1-3). However, in the polyamide resin compositions proposed in these publications, the present inventor has confirmed that heat resistance typified by a deflection temperature under a certain load is lowered when trying to improve impact resistance. doing.

  Therefore, the appearance of a polyamide resin composition excellent in flexibility and impact resistance without deteriorating the heat resistance inherent to the polyamide resin as much as possible and having excellent moldability has been conventionally desired. .

JP-A-55-962 Japanese Examined Patent Publication No. 62-13379 Japanese Patent Laid-Open No. 9-87475

  The problem to be solved by the present invention is to solve the above-mentioned problems, and the polyamide resin composition excellent in flexibility and impact resistance without impairing the heat resistance inherent in the polyamide resin as much as possible. To provide things.

That is, the present invention
[I] polyamide resin (P) 50-99 parts by mass;
[II] polypropylene (A) 1 to 30% by mass satisfying the following requirements (a1) and (a2), and further satisfying the following requirements (b1) and (b2), preferably the following requirements (b3) to (b5): More preferably, it consists of 70 to 99% by mass of a propylene-based copolymer (B) that further satisfies the following requirements (b6) to (b7) (the total of component (A) and component (B) is 100% by mass): 1 to 50 parts by mass of an impact modifier (Q) in which the polar monomer (M) is grafted to the propylene resin composition (C) and the graft amount is 0.01 to 10% by mass [however, the component (P ) And component (Q) in total 100 parts by mass].

(a1) Melting point measured by DSC is 120-170 ° C.
(a2) The isotactic pentad fraction (mmmm) is 90 to 99.8%.
(b1) Melting point measured by DSC is less than 120 ° C. or no melting point is observed.

(b2) Propylene / ethylene containing 51 to 90 mol% of propylene-derived structural units, 7 to 24 mol% of ethylene-derived structural units and 3 to 25 mol% of structural units derived from α-olefins having 4 to 20 carbon atoms -It is an alpha olefin copolymer (here, the sum total of the structural unit derived from propylene, the structural unit derived from ethylene, and the structural unit derived from a C4-C20 alpha olefin shall be 100 mol%).
(b3) Shore A hardness is in the range of 20-90.

(b4) Weight measured by gel permeation chromatography (GPC). Ratio (Mw / Mn) of average molecular weight (Mw) to number average molecular weight (Mn) is 1.2 to 3.5.

(b5) The isotactic triad fraction (mm) calculated by ¹³ C-NMR is 85-99.9%.
(b6) A glass transition temperature (Tg) is observed in the range of −10 ° C. to −50 ° C.
(b7) MFR (ASTMD 1238, 230 ° C., 2.16 kg load) is 0.5 to 500 g / 10 min.
Moreover, the polyamide resin composition which mix | blends an inorganic filler is also one of the aspects of this invention.

  The polyamide resin composition of the present invention is a polyamide resin composition imparted with excellent flexibility and impact resistance without greatly impairing the heat resistance inherent in the polyamide resin.

  The present invention will be described in detail below. The polyamide resin composition of the present invention comprises [I] polyamide resin (P) 50 to 99 parts by mass, [II] polypropylene (A) 1 to 20% by mass satisfying the following requirements (a1) and (a2), and Propylene-based resin composition comprising propylene-based copolymer (B) satisfying requirements (b1) and (b2) of 80 to 99% by mass (the total of component (A) and component (B) is 100% by mass) ( 1) to 50 parts by mass of impact modifier (Q) in which polar monomer (M) is grafted to C) and the graft amount is 0.01 to 10% by mass [wherein component (P) and component (Q) Are 100 parts by mass in total].

  First, a specific polypropylene (A) and a specific propylene copolymer (B) constituting the propylene resin composition (C) which is a raw material before grafting of the polyamide resin (P) and the impact modifier Next, a method for preparing the impact modifier (Q) by grafting the polar monomer (M) will be described, and finally, a polyamide resin composition and a molded product obtained from the composition will be described.

Polyamide resin (P)
The polyamide resin (P) used in the present invention is not particularly limited, and refers to all melt moldable polymers obtained by melt polycondensation reaction of amino acid lactam or diamine and dicarboxylic acid. Specific examples of the polyamide resin (A) used in the present invention include the following resins.

(1) A polycondensation product of an organic dicarboxylic acid having 4 to 12 carbon atoms and an organic diamine having 2 to 13 carbon atoms, for example, polyhexamethylene adipamide which is a polycondensation product of hexamethylenediamine and adipic acid [6, 6 nylon], polyhexamethylene azelamide [6,9 nylon] which is a polycondensate of hexamethylene diamine and azelaic acid, polyhexamethylene sebaca which is a polycondensate of hexamethylene diamine and sebacic acid [6,10 nylon], polyhexamethylene dodecanoamide [6,12 nylon] which is a polycondensate of hexamethylenediamine and dodecanedioic acid, polycondensate of aromatic dicarboxylic acid and aliphatic diamine Semi-aromatic polyamide (PA6T, PA9T, PA10T, PA11T), bis-p-aminocyclohexylme A polycondensate of emissions and dodecanedioic acid polybis (4-aminocyclohexyl) methane dodecane. Specific examples of the organic dicarboxylic acid include adipic acid, pimelic acid, suberic acid, phthalic acid, terephthalic acid, isophthalic acid, naphthalenedicarboxylic acid, phenylenedioxydiacetic acid, oxydibenzoic acid, diphenylmethanedicarboxylic acid, and diphenylsulfone. Dicarboxylic acid, biphenyl dicarboxylic acid, sebacic acid, dodecanedioic acid and the like can be mentioned. Specific examples of the organic diamine include hexamethylene diamine, octamethylene diamine, nonane diamine, octane diamine, decane diamine, undecane diamine, undecane diamine, and dodecane diamine.
(2) Polyundecanamide [11 nylon] which is a polycondensate of ω-amino acid, for example, a polycondensate of ω-aminoundecanoic acid.
(3) Ring-opening polymer of lactam, for example, polycapramide [6 nylon] which is a ring-opening polymer of ε-aminocaprolactam, ring-opening polymer of ε-aminolaurolactam [12 nylon]
Etc. Of these, polyhexamethylene adipamide (6,6 nylon), polyhexamethylene azelamide (6,9 nylon), and polycaproamide (6 nylon) are preferably used.

  In the present invention, a polyamide resin produced from, for example, adipic acid, isophthalic acid and hexamethylenediamine can also be used, and two or more kinds such as a mixture of 6 nylon and 6,6 nylon can be used. It is also possible to use a blend in which the polyamide resin is blended.

Polypropylene (A)
The polypropylene (A) used in the present invention may be a homopolypropylene, a random copolymer of propylene and an α-olefin having 2 to 20 carbon atoms (excluding propylene), or a propylene block copolymer. However, it is preferably a random copolymer of homopolypropylene or propylene and an α-olefin having 2 to 20 carbon atoms (excluding propylene). From the viewpoint of excellent heat resistance of the polyamide resin composition of the present invention, homopolypropylene is preferable, and from the viewpoint of excellent impact characteristics of the obtained molded article, propylene and an α-olefin having 2 to 20 carbon atoms (excluding propylene). The random copolymer of [in the following description, it may be simply abbreviated as a random copolymer or r-PP] is preferably used. Here, as the α-olefin having 2 to 20 carbon atoms other than propylene, ethylene, 1-butene, 1-pentene, 3-methyl-1-butene, 1-hexene, 4-methyl-1-pentene, Examples include 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, 1-eicocene and the like. When a random copolymer is used as the component (A), a copolymer of propylene and ethylene or an α-olefin having 4 to 10 carbon atoms or propylene, ethylene and an α-olefin having 4 to 10 carbon atoms Is preferred. In the random copolymer, the structural unit derived from propylene is usually based on 100 mol% in total of the structural unit derived from propylene and the structural unit derived from α-olefin having 2 to 20 carbon atoms other than propylene. 90 mol% or more. That is, less than 10 mol% of the structural unit derived from α-olefin is contained in the copolymer. The structural unit amount derived from the α-olefin is preferably 0.1 to 8 mol%, more preferably 0.2 to 7.5 mol%.

  The melting point (Tm) obtained by differential scanning calorimetry (DSC) measurement of polypropylene (A) used in the present invention is 120 to 170 ° C., preferably 125 to 168 ° C. [Requirement (a1)], and further measured simultaneously. The amount of heat of fusion (ΔH) is preferably 50 mJ / mg or more. Specifically, the melting point (Tm) was maintained at 200 ° C. for 10 minutes in a differential scanning calorimeter (DSC) measuring device, then cooled to −20 ° C. at a temperature decreasing rate of 10 ° C./min, and 1 at −20 ° C. This is a value measured again under the condition of a heating rate of 10 ° C./min after being held for a minute.

The polypropylene (A) used in the present invention is isotactic polypropylene. The term “isotactic” means that the isotactic pentad fraction (mmmm fraction) measured by NMR method is 90 to 99.8% [requirement (a2)], preferably 95 to 99.8%. The mmmm fraction is, for example, as described in JP-A-2007-186664, the abundance ratio of isotactic chains in pentad units in a molecular chain measured using ¹³ C-NMR, in other words, propylene This is the fraction of propylene monomer units at the center of a chain in which five monomer units are continuously meso-bonded, and is calculated by the measurement method disclosed in the publication.

  The MFR (ASTMD 1238, 230 ° C., 2.16 kg load) of the polypropylene (A) according to the present invention is usually 0.01 to 400 g / 10 minutes (measured under 230 ° C., 2.16 kg load), preferably 0. .1 to 200 g / 10 min, more preferably 0.5 to 100 g / 10 min. The polypropylene (A) according to the present invention, for example, isotactic polypropylene, can be produced by various known methods using a Ziegler-Natta type catalyst or a metallocene catalyst.

Propylene copolymer (B)
The propylene-based copolymer (B) satisfies the following requirements (b1) and (b2), preferably further satisfies the following requirements (b3) to (b5), more preferably the following requirements (b6) to ( The propylene copolymer (B) further satisfies b7).

  (B1) The melting point measured with a differential scanning calorimeter (DSC) is less than 120 ° C. or no melting point is observed, preferably the melting point is 100 ° C. or less, or no melting point is observed. Here, that the melting point is not observed means that a crystal melting peak having a heat of crystal melting of 1 J / g or more is not observed in the range of −150 to 200 ° C. The melting point is a DSC obtained when the specimen after having been conditioned for 72 hours or longer at 23 ° C. ± 2 ° C. is measured at a rate of temperature increase of 10 ° C./min after cooling to −40 ° C. It is the melting point detected on the curve. It should be noted that this is different from the DSC measurement method of the melting point of the polypropylene (A).

  As described above, from the viewpoint of both flexibility and compatibility with polypropylene (A), the propylene-based copolymer (B) is a terpolymer of propylene, ethylene and an α-olefin having 4 to 20 carbon atoms. More specifically, the following requirement (b2) is satisfied.

(B2) Usually, 51 to 90 mol% of propylene-derived structural units, 7 to 24 mol% of ethylene-derived structural units, and 3 to 25 mol% of structural units derived from α-olefins having 4 to 20 carbon atoms are included. Preferably, it contains 60 to 85 mol% of the structural unit derived from lopyrene, 10 to 20 mol% of the structural unit derived from ethylene, 3 to 23 mol% of the structural unit derived from the α-olefin having 4 to 20 carbon atoms, and more Preferably, a copolymer containing 65 to 80 mol% of a structural unit derived from lopyrene, 11 to 19 mol% of a structural unit derived from ethylene, and 4 to 21 mol% of a structural unit derived from an α-olefin having 4 to 20 carbon atoms. (Here, the total of the structural unit derived from propylene, the structural unit derived from ethylene, and the structural unit derived from α-olefin having 4 to 20 carbon atoms is 100 mol%). The α-olefin having 4 to 20 carbon atoms is preferably 1-butene, 1-hexene, 1-octene, or 1-decene because of its availability, and 1-butene is particularly preferable. The constitutional unit (mol%) of each comonomer is determined by analysis of ¹³ C-NMR spectrum as shown in Examples described later.

  (B3) A Shore A hardness in the range of 20 to 90 is preferable from the viewpoint of flexibility, and a range of 35 to 60 is more preferable. The Shore A hardness is an environment of 23 ° C. ± 2 ° C. obtained by subjecting the test body obtained by heat-melting the propylene copolymer (B) at 190 ° C. to 230 ° C. and then press molding at a cooling temperature of 15-25 ° C. It is a value obtained by reading the scale immediately after touching the needle using an A-type measuring instrument after storing for 72 hours or more below (according to ASTM D-2240).

  (B4) The ratio (Mw / Mn) of the weight average molecular weight (Mw) and the number average molecular weight (Mn) measured by gel permeation chromatography (GPC) is preferably 1.2 to 3.5. It is preferable to have such a molecular weight distribution in that the sticky feeling is suppressed because the low molecular weight component is small.

  (B5) It is desirable that the isotactic triad fraction (mm) is 85 to 99.9%, more preferably 85 to 97.5%, and particularly preferably 90 to 97%. If the isotactic triad fraction (mm) is in this range, even if a large amount of comonomer such as ethylene or 1-butene is copolymerized, the crystallinity is not lost completely. Suitable for the invention. The isotactic triad fraction (mm) can be measured by the method described in International Publication No. 2004-087775, page 21, line 7 to page 26, line 6.

  (B6) The glass transition temperature (Tg) is preferably observed in the range of −10 ° C. to −50 ° C. from the viewpoint of mechanical properties at low temperatures. It can obtain | require by the differential scanning calorimeter (DSC) on the conditions of the said (b1) description.

  (B7) MFR (ASTMD 1238, 230 ° C., 2.16 kg load) is preferably 0.5 to 500 g / 10 minutes from the viewpoint of workability and mechanical properties, and more preferably 1 to 100 g / 10 minutes.

  The production method of the propylene-based copolymer (B) is not particularly limited, but a known catalyst capable of stereoregular polymerization of an olefin with an isotactic structure, for example, a catalyst mainly composed of a solid titanium component and an organometallic compound, Alternatively, it can be produced by copolymerizing propylene, ethylene and another α-olefin in the presence of a metallocene catalyst using a metallocene compound as a catalyst component. Preferably, it is obtained by copolymerization in the presence of a metallocene catalyst. Two types of propylene polymers (B) used in Examples described later were prepared by the method described in the publication using a metallocene catalyst described in International Publication WO 2006/098452.

Propylene resin composition (C)
1-30% by mass of the polypropylene (A) and 70-99% by mass of the propylene copolymer (B), preferably 3-25% by mass of the polypropylene (A), and the propylene copolymer (B). 75 to 97% by mass, more preferably 5 to 25% by mass of the polypropylene (A), and 75 to 95% by mass of the propylene copolymer (B) (the total of the component (A) and the component (B) is 100% by mass). Is blended, melted and kneaded with a single-screw extruder, twin-screw extruder, kneader, Banbury mixer, etc. after granulation, using a known method such as a multistage polymerization method, Henschel mixer, V blender, ribbon blender, or mixing. By adopting the method, the propylene-based resin composition (C) according to the present invention can be obtained. In addition, the propylene-based resin composition (C) is converted into an impact resistance improver (Q) in the graft modification step with the subsequent polar monomer (M). Therefore, the polypropylene (A) and the propylene copolymer (B) are individually prepared without once preparing the propylene resin composition (C) from the polypropylene (A) and the propylene copolymer (B). It is also optional to use a method in which both components are melted and kneaded while charging into a reactor for graft modification and carrying out the graft modification reaction.

Impact resistance improver (Q)
As described above, the impact modifier (Q) used in the present invention is obtained by graft-modifying the propylene resin composition (C) with a specific polar monomer (M). That is, the impact modifier (Q) is obtained by adding the polar monomer (M) to the propylene-based resin composition (C) and graft-polymerizing at least a part of the polar monomer (M). A graft-modified resin composition. The polar monomer (M) is usually added in an amount of 0.010 to 15 parts by mass, preferably 0.010 to 5.0 parts by mass with respect to 100 parts by mass of the propylene-based resin composition (C) in the presence of a radical initiator. Let The radical initiator is used in an amount of 0.0010 to 1.0 part by mass, more preferably 0.0010 to 0.30 part by mass with respect to 100 parts by mass of the propylene-based resin composition.

  As the polar monomer (M), a hydroxyl group-containing ethylenically unsaturated compound, a silane compound, an amino group-containing ethylenically unsaturated compound, an epoxy group-containing ethylenically unsaturated compound, an aromatic vinyl compound, an unsaturated carboxylic acid or a derivative thereof, Examples thereof include vinyl ester compounds and vinyl chloride. From the viewpoint of the heat resistance and impact resistance balance in the polyamide resin composition of the present invention and the graft efficiency of the resin composition (C), unsaturated carboxylic acid or The derivative is preferably used, and maleic anhydride is particularly preferably used in view of easy procurement.

  As the radical initiator, an organic peroxide, an azo compound, a metal hydride, or the like can be used. The radical initiator can be used as it is as it is mixed with the other components of the polar monomer (M) and the propylene-based resin composition (C), but can also be used after being dissolved in a small amount of an organic solvent. . The organic solvent is not particularly limited as long as it is an organic solvent that can dissolve the radical initiator.

  Graft modification of the propylene-based resin composition (C) with the polar monomer (M) can be performed by a conventionally known method. The propylene-based resin composition is dissolved in an organic solvent, and then a polar monomer (M) and a radical initiator are added to the solution. A method of reacting for 1 to 10 hours is preferable.

  In addition, an impact modifier (Q) is produced by reacting the polar monomer (M) with the propylene-based resin composition (C) in the presence of a radical initiator in the absence of a solvent using an extruder or the like. You can also This reaction is desirably carried out usually at a temperature equal to or higher than the melting point of the resin composition (C) for 0.5 to 10 minutes.

  In addition, the unmodified propylene resin composition (C) may be blended with the impact modifier (Q) modified with the polar monomer (M) to adjust the degree of modification and various physical properties. Of the polar monomer (M) added to the resin composition (C), the unreacted polar monomer (M) may be removed as necessary by a known method.

Other additives In addition to the polyamide resin (P) and the impact resistance improver (Q), other additives may be added to the polyamide resin composition of the present invention, as long as the object of the present invention is not impaired. And other additives such as synthetic resins, other rubbers, antioxidants, heat stabilizers, weathering stabilizers, slip agents, antiblocking agents, crystal nucleating agents, pigments, hydrochloric acid absorbers, copper damage inhibitors. In addition, when flame retardancy is required for use, it is preferable to further blend an inorganic filler.

  Examples of the inorganic filler used in the present invention include at least one metal compound selected from metal hydroxides, metal carbonates, and metal oxides. Among these, metal hydroxide is preferable, and magnesium hydroxide is more preferable.

Polyamide resin composition and preparation method thereof The polyamide resin composition of the present invention comprises 50 to 99 parts by mass of the polyamide resin (P) and 1 to 50 parts by mass of the impact modifier (Q), preferably a polyamide resin. (P) 60-95 parts by mass and impact resistance improver (Q) 5-40 parts by mass, more preferably 70-95 parts by mass of polyamide resin (P) and impact resistance improver (Q) 5-30 parts by mass Parts, particularly preferably, 75 to 95 parts by mass of polyamide resin (P) and 5 to 25 parts by mass of impact modifier (Q) [however, component (P) and component (Q) are 100 parts by mass in total. It is obtained by using in the ratio. By forming at such a ratio, a molded article having an excellent balance between heat resistance and impact resistance, that is, a polyamide resin imparted with good impact resistance without greatly reducing the original heat resistance of the polyamide resin. A composition can be provided, and the moldability is excellent.

  The polyamide resin composition of the present invention melt-mixes the above-mentioned polyamide resin (P), impact resistance improver (Q), and additives blended as necessary by various conventionally known methods. It is prepared by. That is, the polyamide resin composition according to the present invention is a single-screw extruder after the above components are simultaneously or sequentially charged and mixed in, for example, a Henschel mixer, a V-type blender, a tumbler mixer, a ribbon blender or the like. It is obtained by melt-kneading with a multi-screw extruder, kneader, Banbury mixer or the like.

  Among these kneading apparatuses, when an apparatus having excellent kneading performance such as a multi-screw extruder, a kneader, or a banbury mixer is used, a high-quality polyamide resin composition in which each component is more uniformly dispersed can be obtained. . Moreover, the said additive, for example, antioxidant etc., can also be added as needed in these arbitrary steps.

  The polyamide resin composition according to the present invention obtained as described above can be molded into various shapes by various conventionally known melt molding methods such as injection molding, extrusion molding, and compression molding.

  EXAMPLES Hereinafter, although this invention is demonstrated further more concretely based on an Example, this invention is not limited to these Examples.

[Raw material resin used in Examples]
Polyamide resin (P)
(6 nylon) manufactured by Toray Industries, Inc., Amilan CM1017, MFR (235 ° C., 2.16 kg load): 33 g / 10 min
Polypropylene (A)
(H-PP) Prime Polypro J139, made of Prime Polymer
Skeletal content derived from propylene = 100 mol%, mmmm = 98.5%, MFR = 55.3 (g / 10 min), Tm = 166 ° C.

Propylene copolymer (B)
The following two types of propylene / ethylene / butene copolymers (PEBR-1 and PBER-2) were prepared in accordance with the method disclosed in International Publication No. WO2006 / 98452. The properties of the resin were as follows.
(PEBR-1)
Propylene-derived skeleton content = 75 mol%, ethylene-derived skeleton content = 18 mol%, 1-butene-derived skeleton content = 7 mol%, mm = 91%, MFR = 0.6 (g / 10 min), Mw / Mn = 2.1, Tm peak; not observed, Tg = −30 ° C.
(PEBR-2)
Propylene-derived skeleton content = 68 mol%, ethylene-derived skeleton content = 13 mol%, 1-butene-derived skeleton content = 19 mol%, mm = 92%, MFR = 7 (g / 10 Min), Mw / Mn = 2.1, Tg = −29 ° C.

[Raw material resin used in Comparative Example]
(EBR-1)
Density = 870 kg / m ³ , MFR (ASTM D1238, 190 ° C., 2.16 kg load) = 1.2 (g / 10 min), skeleton content derived from ethylene = 84 mol%, skeleton content derived from 1-butene Amount = 16 mol%
(EBR-2)
Density = 893 kg / m ³ , MFR (ASTM D1238, 190 ° C., 2.16 kg load) = 1.2 (g / 10 min), skeleton content derived from ethylene = 91 mol%, skeleton content derived from 1-butene Amount = 9 mol%
(R-PP)
Density = 910 kg / m ³ , MFR (ASTM D1238, 230 ° C., 2.16 kg load) = 7.0 (g / 10 min), skeleton content derived from propylene = 97 mol%, skeleton content derived from ethylene = 3 mol%

[Measurement methods for various physical properties of impact modifier (Q)]
(Creation of measurement press sheet)
Pressure sheet molding was performed at 10 MPa using a hydraulic hot press machine manufactured by Shindo Metal Industry Co., Ltd. set to 200 ° C. In the case of 0.5 to 3 mm thick sheet (spacer shape; 240 x 240 x 2 mm thick plate 80 x 80 x 0.5 to 3 mm, 4 pieces), the remaining heat is about 5 to 7 minutes and 1 at 10 MPa. After pressurizing for ˜2 minutes, another hydraulic pressure press manufactured by Shinfuji Metal Industry Co., Ltd. set to 20 ° C. was used to compress at 10 MPa, and cooled for about 5 minutes to prepare a measurement sample. A 5 mm thick brass plate was used as the hot plate. The samples prepared by the above method were used for various physical property evaluation samples.
(Shore A hardness)
Measured according to ASTM D-2240.
(Tensile test)
Measured according to ASTM D-638.
A 2 mm thick press sheet was punched out by ASTM No. 4 dumbbell and used as an evaluation sample. The sample was measured at 23 ° C. at a tensile rate of 50 mm / min, and TS (breaking strength) and EL (tensile breaking elongation) were determined.

(Preparation of impact resistance improver)
Impact modifiers (Q-1) to (Q-4) used in the examples described later, and graft modified resins (Q-1 ′) to (Q-3 ′ used in comparative examples described later. The preparation method of

(Preparation method of Q-1)
10 kg of the propylene-based resin composition (C-1) comprising 10% by mass of h-PP and 90% by mass of PEBR-1, the maleic anhydride (MAH) 60 g and 2,5-dimethyl-2,5-di -A solution in which 15 g of (t-butylperoxy) -3-hexyne (Perhexa 25B) was dissolved in acetone was blended. Next, the obtained blend was introduced from a hopper of a screw diameter of 30 mm, L / D = 40 screw extruder, and extruded in a strand shape at a resin temperature of 200 ° C., a screw rotation speed of 240 rpm, and a discharge rate of 12 kg / hr. The resulting strand was sufficiently cooled and then granulated to obtain an impact resistance improver (Q-1). The physical property results of the obtained (Q-1) are shown in Table 1. The degree of modification of the impact modifier (Q) (maleic anhydride content, expressed as MAH (wt%) in Table 1) is a wave number of 1780 cm ⁻¹ peak intensity attributed to a carbonyl group in FT-IR. Based on a calibration curve prepared separately.

(Preparation method of Q-2)
In the method for preparing Q-1, an impact modifier (Q-2) was obtained in the same manner as the method for preparing Q-1, except that MAH was changed to 100 g and perhexa 25B was changed to 30 g. The physical property results of the obtained (Q-2) are shown in Table 1.

(Preparation method of Q-3)
10 kg of the propylene-based resin composition (C-2) composed of 15% by mass of h-PP and 85% by mass of PEBR-2 and a solution in which 60 g of MAH and 15 g of perhexa 25B were dissolved in acetone were blended. Next, the obtained blended material was introduced from a hopper of a twin screw extruder having a screw diameter of 32 mm and L / D = 42, and extruded in a strand shape at a resin temperature of 200 ° C., a screw rotation speed of 240 rpm, and a discharge amount of 12 kg / hr. It was. The obtained strand was sufficiently cooled and then granulated to obtain an impact resistance improver (Q-3). The physical property results of the obtained (Q-3) are shown in Table 1.

(Preparation method of Q-4)
In the method for preparing Q-3, an impact modifier (Q-4) was obtained in the same manner as the method for preparing Q-3 except that MAH was changed to 100 g and perhexa 25B was changed to 30 g. The physical property results of the obtained (Q-4) are shown in Table 1.

(Preparation method of Q-1 ')
A solution prepared by dissolving 10 kg of the above-mentioned EBR-1 and 50 g of MAH and 2 g of perhexa 25B in acetone was blended. Next, the obtained blend was introduced from a hopper of a twin screw extruder having a screw diameter of 32 mm and L / D = 42, and extruded in a strand shape at a resin temperature of 200 ° C., a screw rotation speed of 240 rpm, and a discharge amount of 12 kgg / hr. . Graft-modified resin (Q-1 ') was obtained by granulating, after fully cooling the obtained strand. The physical property results of the obtained (Q-1 ′) are shown in Table 1.

(Method for preparing Q-2 ′)
In the preparation method of Q-1 ′, an impact modifier (Q-2 ′) was obtained in the same manner as the preparation method of Q-5 except that EBR-1 was changed to EBR-2. Table 1 shows the physical property results of the obtained graft-modified resin (Q-2 ′).

(Method for preparing Q-3 ')
In the preparation method of Q-1 ′, an impact modifier (Q-3 ′) was obtained in the same manner as the preparation method of Q-5 except that EBR-1 was changed to r-PP. Table 1 shows the physical property results of the obtained graft-modified resin (Q-3 ′).

[Example 1]
6 nylon [manufactured by Toray Industries, Inc., Amilan CM1017, MFR (235 ° C., 2.16 kg load): 33 g / 10 min] 90 parts by mass and 10 parts by mass of the above impact resistance improver (Q-1) A dry blend was prepared by mixing using a Henschel mixer. Subsequently, this dry blend was supplied to a twin-screw extruder (L / D = 40, 30 mmφ) set at 245 ° C. to prepare polyamide resin composition pellets. The obtained polyamide resin composition pellets were dried at 80 ° C. for one day and night, and then subjected to injection molding under the following conditions to produce physical property test specimens.
(Injection molding conditions)
Cylinder temperature: 245 ° C
Injection pressure: 400 kg / cm ²
Mold temperature: 80 ℃
Subsequently, physical properties of the polyamide resin composition were evaluated by the following methods.
(1) Tensile test Using a test piece having a thickness of 1/8 ", the yield strength and breaking elongation were measured according to ASTM D 638. The test piece was prepared in a dry state at a temperature of 23 ° C for 2 days. It was.

(2) Bending test Using a test piece having a thickness of 1/8 ", the flexural modulus (FM; kg / cm ² ) was measured in accordance with ASTM D 790. The test piece was prepared in a dry state at 23 ° C. For 2 days.
(3) Izod impact test Notched Izod impact strength was measured at 23 ° C. according to ASTM D 256 using a test piece having a thickness of 1/8 ”. The condition of the test piece was adjusted to a temperature of 23 ° C. in a dry state. It was done for 2 days.
(4) Measurement of deflection temperature under load A test piece (127 × 12.7 × t3 mm) was prepared according to ASTM D648, the span was fixed to 100 mm, and a flat indenter of 1.8 mmφ with a heating rate of 120 ° C./hr from 35 ° C. was set to 0. A pressure of .45 MPa was applied, and the evaluation was performed at the temperature when the deflection amount was 0.254 mm. The results are shown in Table 2.

[Example 2]
In Example 1, a polyamide resin composition was prepared in the same manner as in Example 1 except that 80 parts by mass of 6 nylon and 20 parts by mass of the impact resistance improver (Q-1) were used. The results are shown in Table 2.

Example 3
In Example 1, a polyamide resin composition was prepared in the same manner as in Example 1 except that the impact modifier (Q-3) was used instead of the impact modifier (Q-1). The results are shown in Table 2.

Example 4
Polyamide as in Example 1 except that 80 parts by mass of nylon 6 and 20 parts by mass of impact modifier (Q-3) instead of impact modifier (Q-1) were used in Example 1. A resin composition was prepared. The results are shown in Table 2.

[Comparative Example 1]
In Example 1, a polyamide resin composition was prepared in the same manner as in Example 1 except that the impact resistance improver (Q-1) was not used. The results are shown in Table 3.

[Comparative Example 2]
In Example 1, a polyamide resin composition was used in the same manner as in Example 1 except that a dry blend composed of 80 parts by mass of 6 nylon [Amilan CM1017] and 20 parts by mass of the propylene-based resin composition (C-2) was used. Was prepared. The results are shown in Table 2.

[Comparative Example 3]
In Example 1, a polyamide resin composition was prepared in the same manner as in Example 1 except that a dry blend composed of 95 parts by mass of 6 nylon [Amilan CM1017] and 5 parts by mass of the graft-modified resin (Q-1 ′) was used. Prepared. The results are shown in Table 3.
[Comparative Example 4]
In Example 1, a polyamide resin composition was prepared in the same manner as in Example 1 except that a dry blend composed of 90 parts by mass of 6 nylon [Amilan CM1017] and 10 parts by mass of the graft-modified resin (Q-1 ′) was used. Prepared. The results are shown in Table 3.

[Comparative Example 5]
In Example 1, a polyamide resin composition was prepared in the same manner as in Example 1 except that a dry blend consisting of 80 parts by mass of 6 nylon [Amilan CM1017] and 20 parts by mass of graft-modified resin (Q-1 ′) was used. Prepared. The results are shown in Table 3.

[Comparative Example 6]
In Example 1, a polyamide resin composition was prepared in the same manner as in Example 1 except that a dry blend composed of 95 parts by mass of 6 nylon [Amilan CM1017] and 5 parts by mass of the graft-modified resin (Q-2 ′) was used. Prepared. The results are shown in Table 3.

[Comparative Example 7]
In Example 1, a polyamide resin composition was prepared in the same manner as in Example 1 except that a dry blend consisting of 90 parts by mass of 6 nylon [Amilan CM1017] and 10 parts by mass of the graft-modified resin (Q-2 ′) was used. Prepared. The results are shown in Table 3.

[Comparative Example 8]
In Example 1, a polyamide resin composition was prepared in the same manner as in Example 1 except that a dry blend composed of 80 parts by mass of 6 nylon [Amilan CM1017] and 20 parts by mass of graft-modified resin (Q-2 ′) was used. Prepared. The results are shown in Table 3.

[Comparative Example 9]
In Example 1, a polyamide resin composition was prepared in the same manner as in Example 1 except that a dry blend consisting of 80 parts by mass of 6 nylon [Amilan CM1017] and 20 parts by mass of graft-modified resin (Q-3 ′) was used. Prepared. The results are shown in Table 3.

  The polyamide resin composition of the present invention has an excellent balance between impact resistance and heat resistance.

Claims (5)

[I] polyamide resin (P) 50-99 parts by mass;
[II] Polypropylene (A) 1 to 30% by mass satisfying the following requirements (a1) and (a2), and propylene copolymer (B) 70 to 99% by mass satisfying the following requirements (b1) and (b2) [ The total amount of the component (A) and the component (B) is 100% by mass], and the polar monomer (M) is grafted to the propylene-based resin composition (C), and the graft amount is 0.01 to 10% by mass. A polyamide resin composition comprising 1 to 50 parts by mass of a certain impact modifier (Q) (wherein component (P) and component (Q) are 100 parts by mass in total).
(a1) Melting point measured by DSC is 120-170 ° C.
(a2) The isotactic pentad fraction (mmmm) is 90 to 99.8%.
(b1) Melting point measured by DSC is less than 120 ° C. or no melting point is observed.
(b2) Propylene / ethylene containing 51 to 90 mol% of propylene-derived structural units, 7 to 24 mol% of ethylene-derived structural units and 3 to 25 mol% of structural units derived from α-olefins having 4 to 20 carbon atoms -It is an alpha olefin copolymer (here, the sum total of the structural unit derived from propylene, the structural unit derived from ethylene, and the structural unit derived from a C4-C20 alpha olefin shall be 100 mol%). The polyamide resin composition according to claim 1, wherein the propylene-based copolymer (B) further satisfies the following requirements (b3) to (b5).
(B3) Shore A hardness is in the range of 20-90.
(B4) The ratio (Mw / Mn) of the weight average molecular weight (Mw) and the number average molecular weight (Mn) measured by gel permeation chromatography (GPC) is 1.2 to 3.5.
(B5) The isotactic triad fraction (mm) calculated by ¹³ C-NMR is 85-99.9%. The polyamide resin composition according to claim 1 or 2, wherein the propylene-based copolymer (B) further satisfies the following requirements (b6) and (b7).
(B6) A glass transition temperature (Tg) is observed in the range of −10 ° C. to −50 ° C.
(B7) MFR (ASTMD 1238, 230 ° C., 2.16 kg load) is 0.5 to 500 g / 10 min. Furthermore, the polyamide resin composition in any one of Claims 1-3 formed by mix | blending an inorganic filler.   The molded article which consists of a polyamide resin composition in any one of Claims 1-4.