JP2006117818A - Polyamide resin composition and composite molded article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To produce a composite molded article having excellent hot gluing property and remarkably improved damping property at a low cost by combining a hard material with a quite different soft material comprising a polyamide resin and a flexible olefinic thermoplastic elastomer. <P>SOLUTION: The composite molded article is produced by molding a polyamide resin composition containing (A) 20-60 mass% crystalline polyamide resin, (B) 5-30 mass% semi-aromatic amorphous polyamide resin, (C) 5-35 mass% block copolymer composed of a block of a vinyl aromatic compound polymer and a block of polyisobutylene, polyisoprene and/or isoprene-butadiene copolymer and/or a hydrogenation product of the block copolymer, (D) 5-35 mass% polyolefin resin having a functional group reactive with the polyamide resin (the sum of the resin components A to D is 100 pts.mass) and (E) 0-200 pts.mass of an inorganic filler and hot-gluing (F) a polyolefin thermoplastic elastomer to the molded article. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a composite molded article in which a flexible polyolefin-based thermoplastic elastomer is heat-sealed by integral molding on the surface of a polyamide molded article having excellent strength, rigidity and impact resistance. In particular, the present invention relates to a composite molded body made of a polyamide-based resin and a polyolefin-based thermoplastic elastomer that exhibits high damping characteristics while maintaining strength, rigidity, grip properties, and packing seal characteristics.

Conventionally, composite molded bodies made of hard and soft materials have been developed with various combinations of hard polyolefin materials and homogenous materials such as polyolefin-based soft materials and heat-bonded to develop various products. (For example, see Non-Patent Documents 1 and 2)
In order to thermally bond dissimilar materials, compatibility between the dissimilar materials is extremely important. In the case of homogeneous materials, heat bonding can be performed relatively easily. However, such a combination of homogeneous materials has a disadvantage that only a very limited material can be used and the field of application is limited.
Journal of Japan Rubber Association, Vol. 69, no. 9, P-631 (1996) Plastics, Vol. 4, no. 3, P-30 (1997)

On the other hand, flexible elastomers are blended with general-purpose elastomers such as styrene-based thermoplastic elastomers and polyolefin-based thermoplastic elastomers, and polyamide-based thermoplastic elastomers composed of polyether block amide and polyester-type thermoplastic elastomers with polar groups. Have been reported to be thermally bonded to hard materials such as ABS, polycarbonate, nylon and PBT. (For example, see Patent Documents 1 and 2)
However, these blended methods use special soft materials that are blended with general-purpose thermoplastic elastomers and extremely expensive polyamide-based thermoplastic elastomers or polyester-based thermoplastic elastomers. In the integral molding, the heat-bonding strength is insufficient and the composite molded body may peel off. Moreover, depending on the combination of blends, phase separation of the soft material itself occurs, which is not preferable. Furthermore, since the vibration resistance characteristics of the hard material are not sufficiently improved in terms of damping properties, it is not possible to obtain a good molded article that sufficiently exhibits additional effects such as vibration resistance, which is the purpose of the composite molded article.
Japanese Patent Publication No. 6-9878 Japanese Patent Publication No.7-11662

  The present invention has been made to solve the problems of the prior art, and is a combination of a completely different kind of hard material and flexible material, such as a polyamide-based resin and a flexible polyolefin-based thermoplastic elastomer, and has excellent thermal adhesiveness. Further, it is an object of the present invention to produce a composite molded body having greatly improved damping characteristics at low cost.

  As a result of intensive studies to solve the above problems, the present inventors have finally completed the present invention. That is, the present invention comprises (A) a crystalline polyamide resin 20 to 60% by mass, (B) a semi-aromatic amorphous polyamide resin 5 to 30% by mass, (C) a polymer block of a vinyl aromatic compound, A block copolymer comprising isobutylene, polyisoprene, and / or a block comprising a copolymer of isoprene and butadiene and / or a hydrogenated product thereof in an amount of 5 to 35% by mass, and (D) a functional group reactive with a polyamide resin. It is a polyamide resin composition comprising 0 to 200 parts by mass of (E) inorganic filler with respect to 100 parts by mass of the total amount of all resin components containing 5 to 35% by mass of a polyolefin resin having a group. In addition, it is a composite molded body characterized in that (F) a polyolefin-based thermoplastic elastomer is thermally bonded to a molded body made of the polyamide-based resin composition.

  The molded body comprising the polyamide resin composition of the present invention has high damping characteristics and excellent thermal adhesiveness with a polyolefin-based thermoplastic elastomer, and the composite molded body of the present invention has strength, rigidity and impact resistance. It has excellent surface properties such as vibration absorption, packing sealability and grip.

Embodiments of the present invention will be described below.
The (A) crystalline polyamide resin used in the present invention is a polyamide resin that is at least partially crystalline, has an amide bond (—CONH—) in the molecule, and has a melting point (according to JIS K7121). The obtained melting peak temperature) is a polyamide resin, specifically, nylon 6, nylon 66, nylon 6 / nylon 66 copolymer, nylon 46, nylon 12, nylon 11, nylon 6T / nylon 66 copolymer. Nylon MXD-6 and the like are mentioned. In the present invention, nylon 6 and nylon 66 are particularly preferable from the viewpoints of rigidity, durability, heat resistance, economy and the like, but are not limited thereto.
The number average molecular weight of the (A) crystalline polyamide resin used in the present invention is preferably 7,000 to 30,000. In the case of 7,000 or less, the strength may be insufficient, and in the case of 30,000 or more, the melt moldability deteriorates, which is not preferable.

  The compounding quantity of (A) crystalline polyamide resin used for this invention is 20-60 mass% with respect to all the resin components. Especially preferably, it is 25-55 mass%. If it is less than 20% by mass, the advantages of high rigidity, heat resistance, and chemical resistance of the crystalline polyamide are impaired. When it is more than 60% by mass, the thermal adhesiveness with the polyolefin-based thermoplastic elastomer is deteriorated when it is made into a composite.

  The (B) semi-aromatic amorphous polyamide resin used in the present invention has an amide bond (—CONH—) in the molecule and has a melting point (melting peak temperature determined in accordance with JIS K7121). Only glass transition points are present, and those having a number average molecular weight of 7,000 to 30,000 are preferably used. Specific examples include nylon 6T / nylon 66 copolymer, nylon 6T / nylon 6I copolymer, nylon TMD-T / nylon 6 copolymer, etc. In the present invention, nylon 6T / nylon 6I copolymer. Etc., and blends with various nylon copolymers are more preferred.

  The compounding quantity of the (B) semi-aromatic amorphous polyamide resin used for this invention is 5-30 mass% with respect to all the resin components. Preferably it is 5-20 mass%. If the blending amount is 30% by mass or more, the effect of improving the adhesiveness is small, and the heat-resistant mechanical properties when used at a high temperature are deteriorated. When the blending amount is 5% by mass or less, the effect of improving the thermal adhesiveness is low.

The component (C) used in the present invention includes a block copolymer comprising a polymer block of a vinyl aromatic compound and a block comprising a polyisobutylene, polyisoprene, and / or a block comprising a copolymer of isoprene and butadiene, or a block copolymer thereof. It is a hydrogenated product.
As a polymer block of a vinyl aromatic compound, the aromatic portion of the vinyl aromatic compound may be monocyclic or polycyclic, for example, styrene, α-methylstyrene, 1-vinylnaphthalene, 3-methylstyrene, 4-propyl. Styrene, 4-cyclohexyl styrene, 4-dodecyl styrene, 2-ethyl-4-benzyl styrene, 4- (phenylbutyl) styrene, etc. are mentioned, and the block of the vinyl aromatic compound polymer is the above-mentioned vinyl aromatic compound. Homopolymers or copolymers of which are preferred, polystyrene or poly (α-methylstyrene).

  Specific examples of the component (C) include a styrene-isoprene diblock copolymer or a hydrogenated product thereof (SEP), a styrene-isoprene-styrene triblock copolymer (SIS), or a hydrogenated product thereof (SEPS). ), Styrene- (isoprene / butadiene) -styrene triblock copolymer or its hydrogenated product (SEEPS), styrene-isobutylene diblock copolymer, styrene-isobutylene-styrene triblock copolymer, and the like. Regarding the copolymer of isoprene and butadiene, the polymerization form of the block may be random, block, or department store. A styrene-isoprene-styrene triblock copolymer (SIS) having a proportion of isoprene of 40% by mass or more (SIS) or a hydrogenated product thereof (SEPS) is preferable because of its good vibration damping properties. (C) As a component, you may mix | blend 2 or more types of said block copolymers simultaneously.

  In the present invention, the component (C) is blended for the purpose of improving vibration damping characteristics. As a compounding quantity, it is 5-35 mass% with respect to the resin composition. Since the elastic modulus of the polyamide resin composition varies greatly depending on the type and amount of reinforcing material such as inorganic filler, it is necessary to design with the optimal amount of component (C) for the type and amount of reinforcing material to be compounded. However, when the blending amount is less than 5% by mass, the effect of improving the damping property is small, and when the blending amount exceeds 35% by mass, the strength, rigidity, and flexural modulus are lowered, which is not practical. It is preferable that the functional group having reactivity with the polyamide resin is imparted to the component (C) because the deterioration of the mechanical properties with respect to the blending amount is reduced and good mechanical properties and vibration damping properties can be exhibited at the same time.

  Examples of the polyolefin resin in the polyolefin resin having a functional group reactive with the polyamide resin (D) used in the present invention include polyolefin resins such as various polyethylene resins, polypropylene resins, polybutene-1, 4-methylpentene-1. General-purpose resin, ethylene / propylene copolymer, ethylene / butene-1 copolymer, ethylene / octene-1 copolymer, ethylene / hexene-1 copolymer, ethylene / 4 methylpentene-1 copolymer, ethylene / Examples thereof include ethylene copolymers such as cyclic olefin copolymers, propylene copolymers such as propylene / ethylene copolymers and propylene / butene-1 copolymers. These single resins may be a blend of two or more.

  The polyolefin resin in the component (D) has a functional group that reacts with the polyamide resin in order to improve the compatibility with the polyamide resin of the component (A) and the component (B). Specific examples of the functional group that reacts with the polyamide resin include a carboxylic acid group, an anhydride group, an epoxy group, an oxazoline group, an amino group, and an isocyanate group. Of these, anhydride groups are the most reactive and are particularly preferred.

The polyolefin resin having a functional group reactive with the polyamide resin (D) used in the present invention is the component (C) for improving the thermal adhesiveness with the polyolefin thermoplastic elastomer as the component (F). (C) A block copolymer comprising a polymer block of a vinyl aromatic compound and a block comprising a polyisobutylene, polyisoprene, and / or a block comprising a copolymer of isoprene and butadiene, or a hydrogenated product (A) component And (B) for improving dispersibility in the component. (D) The compounding quantity of the polyolefin-type resin which has a functional group reactive with a polyamide resin is 5-35 mass% with respect to all the resin components of a polyamide resin composition. Preferably it is 10-30 mass%. If it is less than 5% by mass, the thermal bond strength between the molded article made of the polyamide resin composition and the polyolefin thermoplastic elastomer becomes weak, and the effect of improving the dispersion of the component (C) becomes low. When it is more than 35% by mass, the fraction in the polyamide-based resin composition becomes too high, and the strength and rigidity are lowered.
As a method for producing the polyolefin resin having a functional group reactive with the polyamide resin (D), for example, a polyolefin resin and a compound having a functional group such as an acid anhydride and an organic peroxide are mixed, Although it can manufacture by melt-kneading with an extruder etc., it is not limited to it.

  The (E) inorganic filler used in the present invention can be appropriately blended in order to increase the rigidity and heat resistance of the molded body made of the polyamide resin composition. Specifically, glass fibers, carbon fibers, ceramic fibers, various whiskers, fibrous inorganic reinforcing materials such as acicular wollastonite, powders such as silica, alumina, talc, kaolin, quartz, powdered glass, mica, and graphite In the form of an inorganic filler. These inorganic fillers can be used alone or in combination of two or more. These inorganic fillers may be treated with a silane coupling agent as a surface treatment agent, and those treated with aminosilane are particularly preferred. When such a coupling treatment is performed, the coupling agent is reactive with the functional group of the component (C), and there is a case where a sufficient reinforcing effect for the polyamide resin composition may not be exhibited. It is preferable that the component (E) is kneaded after the components (B), (C), and (D) are melt-kneaded and dispersed. Specifically, in a twin-screw extruder, this is achieved by top-feeding the (A) component, (B) component, (C) component, (D) component, and side-feeding the (E) component, etc. Although it is one method, it is not limited to this.

  The blending amount of (E) inorganic filler is (A) crystalline polyamide resin, (B) semi-aromatic amorphous polyamide resin, (C) vinyl aromatic compound polymer block, polyisobutylene, poly A block copolymer comprising isoprene and / or a block comprising a copolymer of isoprene and butadiene or a hydrogenated product thereof, and (D) a polyolefin resin having a functional group reactive with a polyamide resin. It is 0-200 mass parts with respect to 100 mass parts of total amounts of a resin component. Preferably it is 0-160 mass parts, Most preferably, it is 0-150 mass parts. If the inorganic filler exceeds 200 parts by mass, the productivity of the polyamide resin composition is remarkably lowered, and glossy appearance of the appearance of the molded product tends to occur, resulting in poor appearance.

  Various modifiers usually used in polyamide resin compositions can be blended with the polyamide-based resin composition in the present invention. For example, carbon black, copper oxide and / or alkali metal halide compounds which are weather resistance improvers, phenolic antioxidants and phosphorus antioxidants as light stabilizers or heat stabilizers, pigments and dyes for coloring In addition, an antistatic agent, a flame retardant, a lubricant and the like can be blended.

  The (F) polyolefin-based thermoplastic elastomer (hereinafter also referred to as TPO) used in the present invention is composed of both a polyolefin-based resin and a rubber component. There are types such as type, blend type, and implant type, but TPO manufactured by any method can be used. Specific examples of the polyolefin resin constituting TPO in the present invention include polyethylene resin and polypropylene resin, and examples of the rubber component include ethylene / propylene / diene rubber (EPDM), butyl rubber (IIR), and ethylene copolymer. Polymerization type flexible polymer, acrylic rubber, natural rubber, nitrile rubber and the like can be mentioned. In the present invention, from the viewpoint of cost and heat resistance, a polypropylene resin is particularly preferred as the polyolefin resin, and TPO composed of ethylene / propylene / diene rubber is particularly preferred as the rubber component.

In the molded product composed of the polyamide-based resin composition according to the present invention and the composite molded product composed of (F) the polyolefin-based thermoplastic elastomer, the thermal bond strength between them is extremely important. The thermal bond strength can be evaluated by the following method. First, using a mold of a test piece for 1A type dumbbell-type tensile test in conformity with ISO527-1, 2 (A), (B), (C), (D), and (E) The dumbbell-shaped molded body is molded using a polyamide-based resin composition comprising the component, the dumbbell-shaped molded body is cut from the center, and only one half-side molded body is mounted in the mold cavity. (F) A dumbbell-shaped composite molded body is molded by an insert molding method in which a polyolefin-based thermoplastic elastomer is additionally molded to obtain a test piece for evaluating thermal adhesion. The tensile test piece of the dumbbell-shaped composite molded body has a joint surface between the polyamide-based resin composition and the polyolefin-based thermoplastic elastomer at the center. (See FIG. 1) The thermal bond strength between the molded article made of the polyamide resin composition of the present invention and the polyolefin-based thermoplastic elastomer is determined by a tensile test using a dumbbell-shaped test piece for thermal adhesive evaluation. Is preferably 3 kgf / 40 mm ² or more. More preferably, it is 4 kgf / 40 mm ² or more. If the thermal bond strength is less than 3 kgf / 40 mm ² , a durable composite molded body cannot be obtained. The thermal adhesive strength of the general molded polyamide resin and the polyolefin-based thermoplastic elastomer evaluated by the same method is 0 to 0.05 kgf / 40 mm ^2. A composite molded body having excellent durability and excellent durability can be obtained.

  The production method of the composite molded body in the present invention is not particularly limited, and includes all known production methods in which a polyolefin-based thermoplastic elastomer is coated or laminated on a molded body composed of a polyamide-based resin composition and heat-sealed. It is. As a specific manufacturing method, a method of heat-sealing by various integral moldings can be mentioned. For example, after a polyamide resin composition is injection-molded, the mold is immediately rotated, and a polyolefin-based thermoplastic elastomer is further injection-molded on the entire surface or a part of the surface of the polyamide-based molded article to be coated and heat-sealed. "Color injection molding method", a molded product in which a polyamide-based resin composition is injection-molded in advance is mounted in a cavity of a mold, and additional molding is performed on the entire surface or part of the molded product with a polyolefin-based thermoplastic elastomer. Insert molding method ”,“ Multilayer extrusion method ”in which a polyamide-based resin composition and a polyolefin-based thermoplastic elastomer are simultaneously extruded and heat-sealed by a multilayer extrusion molding machine, on the surface of a polyamide-based molded product that has been previously extruded or injection molded, This is also done by laminating polyolefin thermoplastic elastomer sheets or molded products that have been extruded or injection molded in advance. Fusing ultrasonic welding machine or a vibration welding machine, such as "heat lamination method", or the like can be adopted. In particular, composite molded products molded by the “two-color injection molding method” and “outsert or insert molding method” have excellent strength, rigidity, and impact resistance, as well as excellent vibration absorption, packing sealability, and grip properties. A component having excellent surface characteristics can be obtained. The present invention is not limited to the above production method.

  By using the polyamide-based resin composition of the present invention, a polyolefin-based thermoplastic elastomer that is inexpensive as a flexible material without using a special adhesive or the like on a hard material having high strength, high rigidity, and excellent damping properties It is possible to easily obtain a composite molded body in which is firmly heat-bonded. As a result, a composite molded body having high durability, functionality, and design can be manufactured at low cost.

The present invention will be specifically described below with reference to examples. The present invention is not limited to these examples.
(Evaluation methods)
1. Melting point The sample was subjected to DSC measurement under the following conditions, and the melting point (melting peak temperature Tpm) was determined according to JIS K7121.
(DSC measurement conditions)
Device name: DSC3100 manufactured by MacScience
Pan ： Aluminum pan (non-airtight)
Sample weight; 4mg
Temperature rising start temperature: 30 ° C
Temperature rising rate: 20 ° C./min.
Atmosphere: Argon

2. Bending strength and flexural modulus Strength properties were evaluated by injection-molding a bending test piece in accordance with ISO178 and ISO527-1, -2 under conditions of a cylinder temperature of 250 ° C and a mold temperature of 80 ° C (manufactured by Toshiba Machine Co., Ltd .: IS It was produced by an injection molding machine), and the bending test was based on ISO178, and each physical property was obtained.

3. Thermal adhesion evaluation (Thermal bonding strength of insert molded products)
The evaluation of the thermal bond strength between a molded article made of a polyamide-based resin composition and a polyolefin-based thermoplastic elastomer is performed by an insert molding method in which a polyolefin-based thermoplastic elastomer is additionally molded as described above. And the thermal bond strength was measured by a tensile test (see FIG. 1). A test piece of the polyamide resin composition was prepared in the same manner as described above. The additional thermoplastic polyolefin elastomer was molded at a cylinder temperature of 250 ° C. and a mold temperature of 60 ° C. There is an adhesive surface in the center of the tensile test piece, and the adhesive area is 4 mm thick × 10 mm wide = 40 mm ² . The tensile speed during the strength measurement was measured at 50 mm / min. For the tensile test, a tensile tester (manufactured by Shimadzu Corporation, Autograph (R) model name AG-5000A) was used to determine the tensile breaking strength at a tensile speed of 50 mm / min and to be the thermal adhesive strength.

4). Vibration characteristics of the polyamide-based resin composition: The vibration damping test was performed by a central vibration method using an ISO dumbbell-type tensile test piece with reference to ISO 6721-1. (See Fig. 1) The center of the test piece is fixed to a shaker, and the vibration is applied from the shaker in an atmosphere of 23 ° C and 50% RH, and the acceleration response is subjected to Fourier transform according to ISO 6721-1. The response function was calculated and the resonance frequency and loss factor were obtained. The loss coefficient η was calculated from the following equation as a vibration frequency difference Δf at two points where the amplitude is 1 / √2 of the resonance amplitude around the resonance frequency f ₀ .
η = Δf / f ₀
Here, when the loss coefficient η was 1.5% or more, it was evaluated that the attenuation characteristic was good.

<Materials used>
Production of various raw materials and modified products used in Examples and Comparative Examples is as follows.
(A) Nylon 6 (Toyobo Nylon (R) T-840, melting point 222 ° C.) was used as the crystalline polyamide resin.
(B) Nylon 6T / 6I copolymer (Mus Japan Co., Ltd .: Grivory (R) G21, no melting peak) was used as a semi-aromatic amorphous polyamide resin.
(C) A block copolymer composed of a polymer block of a vinyl aromatic compound and a block composed of polyisobutylene, polyisoprene, and / or a block composed of a copolymer of isoprene and butadiene, or a hydrogenated product thereof, a polystyrene block And a hydrogenated product of a block copolymer composed of a polyisoprene block (manufactured by Kuraray Co., Ltd .: Hibler (R) 5127).
(D) As a polyolefin resin having a functional group reactive with a polyamide resin, maleic acid-modified polypropylene (manufactured by Grand Polymer Co., Ltd .: MMP006) was used.

(E) As the inorganic filler, talc (manufactured by Hayashi Kasei Co., Ltd .: KSTW) and glass fiber (manufactured by Nippon Sheet Glass Fiber Co., Ltd .: TP57E) were used.
In addition, Irganox (R) B1171 (manufactured by Ciba Geigy) was used as a heat stabilizer and WE40 (manufactured by Clariant Japan) was used as a release agent.
(F) Polyolefin thermoplastic elastomer to be thermally bonded to a polyamide resin molded body is a polyolefin thermoplastic elastomer composed of a polypropylene resin as a polyolefin resin and ethylene / propylene / diene rubber as a rubber component (DSM) Manufactured by Sirlink (R) 3160, manufactured by AES: Santoprene (R) 101-55).

(Examples 1-4, Comparative Examples 1-4)
<Production of polyamide resin composition>
The resin components from the components listed in Table 1 are mixed in the proportions in the table, and charged into a 40 mmφ twin screw extruder (Ikegai Iron Works Co., Ltd .: PCM twin screw extruder) set at a cylinder temperature of 240 to 270 ° C., and glass Fibers and talc were blended into the molten resin by side feed so as to have the proportions in the table, kneaded and extruded, cast into water, and cut to obtain pellets. The pellet surface is 0.3 parts by mass of Irganox (R) B1171 (manufactured by Ciba Geigy) as a heat stabilizer and 0.5 parts by mass of WE40 (manufactured by Clariant Japan) as a release agent with respect to 100 parts by mass of the pellets. A polyamide-based resin composition was obtained by attaching to the resin, and various evaluations were performed.

The evaluation results of Examples 1 to 4 and Comparative Examples 1 to 4 are shown in Table 1.
As is clear from Examples 1 to 4, it can be seen that the polyamide-based resin composition of the present invention has excellent damping characteristics and excellent thermal adhesiveness with a soft material. On the other hand, Comparative Examples 1 to 4 show the properties of a polyamide resin composition not containing the component (C) block copolymer. In Comparative Examples 2 and 4, the semi-aromatic amorphous polyamide (B) is further included. And the characteristic when not containing the polyolefin-type resin which has a functional group reactive with the polyamide of (D) component was shown. In the case where the component (C) block copolymer is not contained, the adhesiveness to the flexible material is sufficiently developed, but the loss factor is low, and the target damping characteristics cannot be obtained in the polyamide resin composition. When (B) component semi-aromatic amorphous polyamide and (D) component polyamide do not contain a polyolefin resin having a functional group reactive, (F) component polyolefin thermoplastic elastomer (softener) In Comparative Examples 2 and 4, the test piece was not already bonded when the sample for evaluation was taken out from the mold. That is, there was no thermal adhesive force between the polyamide-based resin composition and the polyolefin-based thermoplastic elastomer.

  The molded body made of the polyamide resin composition of the present invention has high damping characteristics and excellent thermal adhesiveness with an olefinic thermoplastic elastomer. In addition, the composite molded body of the present invention in which a polyolefin-based thermoplastic elastomer is thermally bonded to a molded body made of a polyamide-based resin composition is excellent in strength, rigidity, impact resistance, and excellent vibration absorption, packing sealability, Because it has gripping surface characteristics, it can be used in a wide range of application fields such as electric tools, fishing gear, sports equipment, entertainment equipment, shift lever housing, automobile parts such as engine cover and mission cover, office supplies, etc. It is important to contribute to the industry.

Schematic diagram of test piece for thermal bond strength measurement Schematic diagram of vibration damping test equipment for evaluating vibration resistance

Explanation of symbols

1: Part pre-molded with polyamide resin composition 2: Part additionally molded with polyolefin-based thermoplastic elastomer 3: Thermally bonded part of both 4: Test piece 5: Vibration output (sensor)
6: Excitation device 7: Excitation direction

Claims (3)

  (A) 20 to 60% by mass of crystalline polyamide resin, (B) 5 to 30% by mass of semi-aromatic amorphous polyamide resin, (C) polymer block of vinyl aromatic compound, polyisobutylene, polyisoprene, And / or a block copolymer comprising a block comprising a copolymer of isoprene and butadiene and / or a hydrogenated product thereof in an amount of 5 to 35% by mass, and (D) a polyolefin system having a functional group reactive with a polyamide resin A polyamide-based resin composition comprising 0 to 200 parts by mass of (E) inorganic filler with respect to 100 parts by mass of the total amount of all resin components containing 5 to 35% by mass of resin.   A composite molded article obtained by thermally bonding (F) a polyolefin-based thermoplastic elastomer to a molded article comprising the polyamide-based resin composition of claim 1.   3. The composite molded body according to claim 2, wherein the heat bonding method is heat fusion by integral molding.

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