JP2000290497A - Polyamide resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polyamide resin composition having improved processability and excellent surface-property of a molded article. SOLUTION: The objective polyamide resin composition is produced by compounding (A) 100 pts.wt. of a polyamide resin with (B) 0.0001-20 pts.wt. (in terms of polytetrafluoroethylene component) of a polytetrafluoroethylene- containing powdery mixture composed of polytetrafluoroethylene particles having particle diameter of <=10 μm and an organic polymer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a polyamide resin composition having improved processability.

[0002]

2. Description of the Related Art Polyamide resins are widely used as engineering plastics because of their excellent physical properties, but most of them are obtained exclusively by injection molding. In order to make the polyamide resin into more various molded products, molding by blow molding, extrusion molding, foam molding or the like is desired. However, polyamide resins are generally the most important properties in applying these processing methods,
That is, since the melt tension is low, drawdown is severe during blow molding or extrusion molding, and it is extremely difficult to obtain a molded article having a desired shape by a molding method other than injection molding, such as not being able to obtain uniform cells during foam molding. As this improvement method, a method using a high polymerization degree polyamide resin having a high intrinsic viscosity, a method using a polyamide resin having a branch, a method of blending another thermoplastic resin, a method of further adding a filler, and the like have been proposed. All have little improvement effect and are insufficient as materials for these processing methods.

JP-A-3-183524 discloses an attempt to improve processability by blending polytetrafluoroethylene with a thermoplastic resin such as a polyamide resin. However, polytetrafluoroethylene has poor dispersibility with respect to a general thermoplastic resin containing no halogen atom, and this method requires a large amount of polytetrafluoroethylene to improve processability, There is a disadvantage that the surface properties of the molded article are impaired.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a polyamide resin composition having excellent surface properties of a molded article and improved workability.

[0005]

Means for Solving the Problems As a result of intensive studies to solve the above-mentioned problems, a polytetrafluoroethylene-containing mixed powder comprising polytetrafluoroethylene particles having a particle diameter of 10 μm or less and an organic polymer was mixed with a polyamide. It has been found that by adding to a resin, the melt tension is remarkably improved, and a molded product having good workability in blow molding, extrusion molding, foam molding and the like and excellent surface properties can be obtained.

The gist of the present invention is to provide a polyamide resin (A) 1
The polytetrafluoroethylene-containing mixed powder (B) composed of polytetrafluoroethylene particles having a particle diameter of 10 μm or less and an organic polymer is contained in an amount of 0.0001 to 20 parts by weight with respect to 00 parts by weight. Part of the polyamide resin composition.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The polyamide resin (A) used in the present invention is not particularly limited, and means any polymer that can be melt-polymerized and melt-molded from an amino acid lactam or a diamine and a dicarboxylic acid.

Specific examples of the polyamide resin (A) used in the present invention include the following resins.
(1) Polycondensate 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 polycondensate of hexamethylene diamine and adipic acid [6,6 nylon], polyhexamethylene azelamide [6,9 nylon] which is a polycondensate of hexamethylene diamine and azelaic acid, and polyhexamethylene sebaca which is a polycondensate of hexamethylene diamine and sebacic acid Amide [6,10 nylon], polyhexamethylene dodecanoamide [6,12 nylon] which is a polycondensate of hexamethylenediamine and dodecandionic acid, polycondensation of bis-p-aminocyclohexylmethane with dodecandionic acid Polybis (4-aminocyclohexyl) methanedodecane, (2) ω
-Polycondensates of amino acids, for example polyundecaneamide [11 nylon], which is a polycondensate of ω-aminoundecanoic acid; [6 nylon], ring-opened polymer of ε-aminolaurolactam, polylauric lactam [12 nylon] and the like. Among them, polyhexamethylene adipamide (6,
6 nylon), polyhexamethylene azeramide (6,9
Nylon) and polycaprolamide (6 nylon) are preferably used.

In the present invention, for example, a polyamide resin produced from adipic acid, isophthalic acid, and hexamethylenediamine can be used. Further, a mixture of nylon 6 and nylon 6,6 can be used. 2
It is also possible to use a blend containing at least one kind of polyamide resin.

The polyamide resin (1) is, for example, an organic dicarboxylic acid having 4 to 12 carbon atoms and an organic dicarboxylic acid having 2 to 12 carbon atoms.
To 13 in an equimolar amount. Further, if necessary, an organic dicarboxylic acid can be used in a larger amount than an organic diamine so that the carboxy group in the polyamide resin is in excess of the amino group. The organic dicarboxylic acid can be used in a smaller amount than the organic diamine so that it is in excess of the group.

Specific examples of the above organic dicarboxylic acids include adipic acid, pimelic acid, suberic acid, sebacic acid, dodecane diacid and the like. Specific examples of the organic diamine include hexamethylene diamine, octamethylene diamine, and the like.

The polyamide resin (1) is prepared from a derivative capable of forming a carboxylic acid such as an ester and an acid chloride and a derivative capable of forming an amine such as an amine salt in the same manner as in the above method. You can also.

The polyamide resin (2) can be prepared, for example, by heating an ω-amino acid in the presence of a small amount of water to carry out polycondensation. Often, a small amount of a viscosity stabilizer such as acetic acid is added.

The polyamide resin (3) can be prepared, for example, by subjecting a lactam to ring-opening polymerization by heating in the presence of a small amount of water. Often, a small amount of a viscosity stabilizer such as acetic acid is added.

The polytetrafluoroethylene-containing mixed powder (B) used in the present invention is composed of polytetrafluoroethylene particles having a particle diameter of 10 μm or less and an organic polymer. It is necessary that these do not form aggregates. As such a polytetrafluoroethylene-containing mixed powder, an aqueous dispersion of polytetrafluoroethylene particles having a particle diameter of 0.05 to 1.0 μm and an aqueous dispersion of organic polymer particles are mixed and coagulated or spray-dried. After polymerization of the monomers constituting the organic polymer in the presence of an aqueous dispersion of polytetrafluoroethylene particles having a particle diameter of 0.05 to 1.0 μm, or solidification or spray drying In a dispersion obtained by mixing an aqueous dispersion of polytetrafluoroethylene particles and an aqueous dispersion of organic polymer particles having a particle diameter of 0.05 to 1.0 μm, What is obtained by carrying out emulsion polymerization of the monomer which has a bond, and pulverizing by coagulation or spray drying is preferable. The aqueous dispersion of polytetrafluoroethylene particles having a particle size of 0.05 to 1.0 μm used for obtaining the polytetrafluoroethylene-containing mixed powder (B) used in the present invention is obtained by emulsion polymerization using a fluorinated surfactant. Obtained by polymerizing a tetrafluoroethylene monomer.

[0016] In the emulsion polymerization of polytetrafluoroethylene particles, a copolymer component such as hexafluoropropylene, chlorotrifluoroethylene, fluoroalkylethylene, or perfluoroalkylvinyl ether is contained as long as the properties of polytetrafluoroethylene are not impaired. Fluorinated olefins and fluorinated alkyl (meth) acrylates such as perfluoroalkyl (meth) acrylate can be used. The content of the copolymer component is preferably 10% by weight or less based on tetrafluoroethylene.

Commercially available raw materials for the polytetrafluoroethylene particle dispersion include Fluon AD-1 and AD-936 manufactured by Asahi Glass Fluoropolymer Co., Ltd., and Polyflon D-1 and D-2 manufactured by Daikin Industries, and DuPont Mitsui Fluorochemical Co., Ltd. Teflon 30J manufactured by the company can be cited as a representative example.

The organic polymer constituting the polytetrafluoroethylene-containing mixed powder used in the present invention is not particularly limited. However, from the viewpoint of dispersibility when blended with the polyamide resin, the organic polymer has an affinity with the polyamide resin. It is preferable that the property is high.

Specific examples of the monomer for forming the organic polymer include styrene, α-methylstyrene, p-methylstyrene, o-methylstyrene, t-butylstyrene, o-ethylstyrene, and p-methylstyrene. Aromatic vinyl monomers such as chlorostyrene, o-chlorostyrene, 2,4-dichlorostyrene, p-methoxystyrene, o-methoxystyrene, 2,4-dimethylstyrene; methyl acrylate, methyl methacrylate, acrylic Ethyl acrylate, ethyl methacrylate, butyl acrylate, butyl methacrylate,
2-ethylhexyl acrylate, methacrylic acid-2-
(Meth) acrylic ester monomers such as ethylhexyl, dodecyl acrylate, dodecyl methacrylate, tridecyl acrylate, tridecyl methacrylate, octadecyl acrylate, octadecyl methacrylate, cyclohexyl acrylate, and cyclohexyl methacrylate; acrylonitrile, methacrylonitrile Vinyl cyanide monomers such as maleic anhydride; α, β-unsaturated carboxylic acids such as maleic anhydride; maleimide monomers such as N-phenylmaleimide, N-methylmaleimide, N-cyclohexylmaleimide; glycidyl methacrylate Epoxy group-containing monomers such as vinyl methyl ether and vinyl ethyl ether; vinyl ether monomers such as vinyl acetate and vinyl butyrate; ethylene and propylene;
Olefin monomers such as isobutylene; diene monomers such as butadiene, isoprene, and dimethylbutadiene; These monomers can be used alone or in combination of two or more.

Among these monomers, aromatic vinyl monomers, (meth) acrylate monomers, vinyl cyanide monomers are preferred from the viewpoint of affinity with the polyamide resin. One or more monomers selected from the group consisting of α, β-unsaturated carboxylic acids, maleimide monomers, and epoxy group-containing monomers containing at least 50% by weight of at least one monomer selected from the group consisting of Monomers containing the above monomers in an amount of 0.1% by weight or more and less than 50% by weight can be exemplified.
Particularly preferred is one containing at least 50% by weight of one or more monomers selected from the group consisting of styrene, methyl methacrylate and acrylonitrile, and maleic anhydride,
0.1% by weight of one or more monomers selected from the group consisting of N-phenylmaleimide and glycidyl methacrylate
Monomers containing at least 50% by weight can be mentioned.

The content of polytetrafluoroethylene in the polytetrafluoroethylene-containing mixed powder used in the present invention is preferably 0.1% by weight to 90% by weight.

The polytetrafluoroethylene-containing mixed powder used in the present invention is poured into a hot water in which a metal salt such as calcium chloride or magnesium sulfate is dissolved, salted out, solidified, and dried. Alternatively, it can be powderized by spray drying.

Normal polytetrafluoroethylene fine powder becomes an aggregate of 100 μm or more in the step of recovering as a powder from the state of a particle dispersion, and thus it is difficult to uniformly disperse it in a thermoplastic resin. On the other hand, the polytetrafluoroethylene-containing mixed powder used in the present invention is extremely excellent in dispersibility in a polyamide resin because polytetrafluoroethylene alone does not form a domain having a particle diameter of more than 10 μm.
As a result, in the polyamide resin composition of the present invention, polytetrafluoroethylene is efficiently made into fine fibers in the polyamide resin, and various moldability is excellent, and surface property is also excellent.

In the resin composition of the present invention, the polytetrafluoroethylene-containing mixed powder (B) has a polytetrafluoroethylene component content of 0.0001 to 20 parts by weight based on 100 parts by weight of the polyamide resin (A). It was blended so that If it is less than 0.0001 part, the effect of improving workability is poor, and if it exceeds 20 parts by weight, the fluidity at the time of melting may be too low.

The resin composition of the present invention contains pigments, dyes, glass fibers, metal fibers, and the like within a range that does not impair the original purpose.
Reinforcing agents and fillers such as metal flakes and carbon fiber, 2,6
Phenolic antioxidants such as di-butyl-4-methylphenol, 4,4'-butylidene-bis (3-methyl-6-t-butylphenol), tris (mixed, mono and dinyphenyl) phosphite, diphenyl Phosphite-based antioxidants such as isodecyl phosphite; sulfur-based antioxidants such as dilauryl thiodipropionate, dimyristyl thiodipropionate diasterial thiodipropionate; 2-hydroxy-
Benzotriazole-based ultraviolet absorbers such as 4-octoxybenzophenone and 2- (2-hydroxy-5-methylphenyl) benzotriazole;
6) light stabilizers such as -tetramethyl-4-piperidinyl), antistatic agents such as hydroxylalkylamine and sulfonate, lubricants such as ethylenebisstearylamide and metal soap, and tetrabromophenol A, decabromophenol oxide By blending various additives such as a flame retardant such as a TBA epoxy oligomer, a TBA polycarbonate oligomer, and antimony trioxide, the physical properties and characteristics can be adjusted to more desirable properties.

The polyamide resin composition of the present invention may further comprise a polyphenylene ether resin, an aromatic polyester resin, if necessary, in addition to the polyamide resin (A).
Vinyl polymers such as polymethyl methacrylate (PMMA), polycarbonate resins, ABS resins, styrene resins, vinyl chloride resins, polyolefin resins such as polyethylene and polypropylene, and ethylene / propylene copolymers and ethylene / butene-1 copolymers Polymers, ethylene / propylene / dicyclopentadiene copolymer, ethylene / propylene / 5-ethylidene-2-rubbornene copolymer, ethylene / propylene / 1,4-hexadiene copolymer, ethylene / vinyl acetate copolymer, By appropriately blending an olefin rubber such as an ethylene / butyl acrylate copolymer, more desirable physical properties and characteristics can be adjusted.

A predetermined amount of each of the above essential components and, if desired, optional components is blended and kneaded with a usual kneader such as a roll, a Banbury mixer, a single screw extruder, or a twin screw extruder to prepare a composition. However, usually, it is preferable to form a pellet. Alternatively, the composition of the present invention may be prepared by diluting a master batch containing the polytetrafluoroethylene-containing mixed powder (B) at a high concentration with the polyamide resin (A).

Since the polyamide resin composition of the present invention thus obtained has high melt elasticity, it has draw-down resistance in blow molding, extrusion molding, and thermoforming.
The uniformity of the cells during the foam molding, the calender moldability, etc. are improved and the moldability is excellent. In addition, there is no macro-aggregate of polytetrafluoroethylene, and the molded product has excellent surface properties.

The processing method of the polyamide resin composition of the present invention is not particularly limited, but may be blow molding, extrusion molding,
Thermoforming, foam molding, calender molding, injection molding, melt spinning, and the like can be given.

Useful molded articles obtained by using the polyamide resin composition of the present invention are not particularly limited, but hollow molded articles, sheets, thermoformed articles, pipes, square bars, irregularly shaped articles, foams, films, Injection molded articles, fibers and the like can be mentioned.

Hereinafter, the present invention will be described with reference to Examples.
The present invention is not limited to these.

[0032]

EXAMPLES In each description, "parts" indicate parts by weight, and "%" indicates% by weight.
And physical properties are measured by the following methods.

(1) Solid content concentration: 170 ° C. of the particle dispersion
And dried for 30 minutes.

(2) Particle size distribution, weight average particle size: A solution obtained by diluting a particle dispersion with water was used as a sample solution, and a dynamic light scattering method (ELS800 manufactured by Otsuka Electronics Co., Ltd., temperature: 25 ° C., scattering angle: 90) Degree).

(3) Zeta potential: 0.0
An electrophoresis method (ELS800, manufactured by Otsuka Electronics Co., Ltd.)
At a temperature of 25 ° C. and a scattering angle of 10 °).

(4) Melt tension: A polyamide resin was discharged at a resin temperature of 230 ° C., an orifice L / D = 10 mm / 1 mm, and a piston descending speed of 10 mm / min using a capillary rheometer (Toyo Seiki Capillograph). The load when taking off at a take-up speed of 4 m / min was measured with a load cell.

(5) Blow moldability: The drawdown resistance, uneven wall thickness and surface appearance during blow molding were evaluated.

-Drawdown resistance Judgment was made according to the following criteria from the parison length when a parison of 30 cm was held at a molding temperature of 240 ° C. for 30 seconds.

○: Drawdown amount 5 cm or less △: Drawdown amount 5 to 10 cm ×: Drawdown amount 10 cm or more ・ Uneven thickness: Blow molding a 1000 ml square bottle and visually observing the wall thickness distribution. Judgment was made based on the following criteria.

：: Thickness variation is small X: Thickness variation is large ・ Surface appearance: The surface appearance of the molded product for which the thickness unevenness was evaluated was visually observed and judged according to the following criteria.

○: No bumps on the surface ×: bumps on the surface Reference Example 1 <Polytetrafluoroethylene-containing powder (B-
Production of 1)> In a separable flask equipped with a stirring blade, a condenser, a thermocouple, and a nitrogen inlet, 190 parts of distilled water, 1.5 parts of sodium dodecylbenzenesulfonate, 100 parts of styrene, and 0.5 part of cumene hydroperoxide. And heated to 40 ° C. under a nitrogen stream. Then, iron (II) sulfate 0.001
Parts, disodium ethylenediaminetetraacetate 0.003
, A mixed solution of 0.24 parts of Rongalite salt and 10 parts of distilled water was added to initiate radical polymerization. After the fever ends,
The temperature in the system was maintained at 40 ° C. for 1 hour to complete the polymerization,
A styrene polymer particle dispersion (hereinafter referred to as P-1) was obtained.

The solid concentration of P-1 was 33.3%, the particle size distribution showed a single peak, and the weight average particle size was 96 n.
m, and the surface potential was -32 mV.

On the other hand, as a polytetrafluoroethylene-based particle dispersion, Fluon AD manufactured by Asahi Glass Fluoropolymers Co., Ltd.
936 was used. AD936 has a solid content of 63.0%
And containing 5 parts of polyoxyethylene alkylphenyl ether per 100 parts of polytetrafluoroethylene. The particle size distribution of AD936 shows a single peak, the weight average particle size is 290 nm, and the surface potential is −
20 mV.

To 833 parts of AD936, 1167 parts of distilled water was added to obtain a polytetrafluoroethylene particle dispersion F-1 having a solid concentration of 26.2%. F-1 contains 25% of polytetrafluoroethylene particles and 1.2% of polyoxyethylene nonylphenyl ether.

A separable flask equipped with a stirring blade, a condenser, a thermocouple, and a nitrogen inlet was prepared by mixing 160 parts of F-1 (40 parts of polytetrafluoroethylene) and 181.8 parts of P-1 (60 parts of polystyrene). And stirred at room temperature for 1 hour under a nitrogen stream. Then the temperature inside the system was raised to 80 ° C,
Hold for 1 hour. No solid matter was separated through a series of operations, and a uniform particle dispersion was obtained. The solid content concentration of the particle dispersion was 29.3%, the particle size distribution was relatively broad, and the weight average particle size was 168 nm.

341.8 parts of this particle dispersion was poured into 700 parts of 85 ° C. hot water containing 5 parts of calcium chloride to separate a solid, filtered and dried to obtain a mixed powder containing polytetrafluoroethylene (B). -1) 98 parts were obtained.

After B-1 was shaped into a strip shape at 250 ° C. by a press molding machine, ultrathin sections were observed with a microtome and observed under a transmission electron microscope without staining. Although polytetrafluoroethylene is observed as a dark area, 10 μm
No aggregates larger than m were observed.

Reference Example 2 <Production of Polytetrafluoroethylene-Containing Mixed Powder (B-2)> A separable flask equipped with a stirring blade, a condenser, a thermocouple, a nitrogen inlet, and a dropping funnel was used in Reference Example 1. F
-1 to 160 parts (polytetrafluoroethylene 40
Parts), 1.0 part of dodecylbenzenesulfonic acid, 7 parts of distilled water
0 parts were charged, and the temperature was raised to 80 ° C. under a nitrogen stream. Next, 0.001 part of iron (II) sulfate, 0.003 part of disodium ethylenediaminetetraacetate, 0.24 of Rongalit salt
And a mixture of 10 parts of distilled water, 20 parts of n-butyl acrylate, 35 parts of styrene, and 5 parts of maleic anhydride.
And a mixture of 0.3 parts of tertiary butyl peroxide were added dropwise from a dropping funnel over 90 minutes to allow radical polymerization to proceed. After the completion of the addition, the internal temperature was maintained at 80 ° C. for 1 hour.
No solid matter was separated through a series of operations, and a uniform particle dispersion was obtained. The solid concentration of the particle dispersion is 33.2.
%, The particle size distribution is relatively broad and the weight average particle size is 2
It was 52 nm.

301.5 parts of this particle dispersion was put into 700 parts by weight of 85 ° C. hot water containing 5 parts of calcium chloride to separate a solid, filtered and dried to obtain a mixed powder containing polytetrafluoroethylene ( B-2) 97 parts were obtained.

After B-2 was shaped into a strip at 250 ° C. by a press molding machine, ultrathin sections were observed with a microtome without staining using a transmission electron microscope. Although polytetrafluoroethylene is observed as a dark area, 10 μm
No aggregates larger than m were observed.

Reference Example 3 <Production of mixed powder containing polytetrafluoroethylene (B-3)> A mixture of 70 parts of dodecyl methacrylate and 30 parts of methyl methacrylate
2'-azobis (2,4-dimethylvaleronitrile)
0.1 parts were dissolved. A mixed solution of 2.0 parts of sodium dodecylbenzenesulfonate and 300 parts of distilled water was added thereto, and the mixture was stirred at 10,000 rpm for 4 minutes with a homomixer. A methyl methacrylate preliminary dispersion was obtained. This was charged into a separable flask equipped with a stirring blade, a condenser, a thermocouple, and a nitrogen inlet, the internal temperature was raised to 80 ° C. under a nitrogen stream, and the mixture was stirred for 3 hours to undergo radical polymerization, and dodecyl methacrylate / methyl A methacrylate copolymer particle dispersion (hereinafter referred to as P-2) was obtained.

The solid concentration of P-2 was 25.1%, the particle size distribution showed a single peak, and the weight average particle size was 190%.
nm, and the surface potential was -39 mV.

The amount of F-1 used in Reference Example 1 was 80 parts (polytetrafluoroethylene 20 parts) and 239.0 parts of P-2.
(60 parts of dodecyl methacrylate / methyl methacrylate copolymer) was charged into a separable flask equipped with a stirring blade, a condenser, a thermocouple, a nitrogen inlet, and a dropping funnel, and stirred at room temperature for 1 hour under a nitrogen stream. Then 8 in the system
The temperature was raised to 0 ° C., and a mixed solution of 0.001 part of iron (II) sulfate, 0.003 part of disodium ethylenediaminetetraacetate, 0.24 part of Rongalite salt and 10 parts of distilled water was added, and 18 parts of methyl methacrylate was added. , Glycidyl methacrylate 2
And a mixture of 0.1 part of tertiary butyl peroxide was added dropwise over 30 minutes. After completion of the addition, the internal temperature was maintained at 80 ° C. for 1 hour to complete the radical polymerization. No solid matter was separated through a series of operations, and a uniform particle dispersion was obtained. The solid content concentration of the particle dispersion was 28.6%, the particle size distribution was relatively broad, and the weight average particle size was 221 nm.

349.7 parts of this particle dispersion was poured into 600 parts of 75 ° C. hot water containing 5 parts of calcium chloride, and the solid was separated, filtered and dried to obtain a mixed powder containing polytetrafluoroethylene (B). -3) 98 parts were obtained.

The dried B-3 was shaped into strips at 220 ° C. by a press molding machine, and ultrathin sections were observed with a microtome without staining using a transmission electron microscope.
Polytetrafluoroethylene was observed as a dark part, but no aggregate larger than 10 μm was observed.

Reference Example 4 <Preparation of Master Pellets (M-1) of Polytetrafluoroethylene-Containing Mixed Powder> Tetrafluoroethylene obtained in Reference Example 3 with respect to 60 parts of 6 nylon [CM1017 manufactured by Toray Industries, Inc.] After blending 40 parts of the mixed powder B-3 containing powder and hand blending, a twin screw extruder (ZSK manufactured by WERNER & PFLEIDERER)
30), the mixture was melt-kneaded at a barrel temperature of 245 ° C. and a screw rotation speed of 200 rpm, and shaped into pellets;
A master pellet (hereinafter referred to as M-1) of a polytetrafluoroethylene-containing mixed powder was obtained.

Reference Example 5 <Production of master pellet (M-2) of polytetrafluoroethylene-containing mixed powder> 6,6 nylon [Toray Co., Ltd.] instead of 60 parts of 6 nylon [CM1017 manufactured by Toray Industries, Inc.] CM3001N] 60
Except that the master pellet of polytetrafluoroethylene-containing mixed powder (hereinafter referred to as M
-2).

(Polyamide resin A-1) 6 nylon [CM1017 manufactured by Toray Industries, Inc.] (Polyamide resin A-2) 6,6 nylon [Toray Industries, Ltd.
CM3001N] Examples 1 to 8, Comparative Examples 1 to 6 Polyamide resin (A-1, 2) and tetrafluoroethylene-containing mixed powder (B-1 to 3) or master pellet (M-) obtained in each reference example. 1, 2) were blended at the ratios shown in Table 1 and a twin-screw extruder (WERNER & PFLEIDER) was used.
The pellets were extruded with a barrel temperature of 245 ° C. and a screw rotation speed of 200 rpm by ER ZSK30). The melt tension and blow moldability were evaluated using the pellets. Table 1 shows the results.

For comparison, a mixture extruded without adding a polytetrafluoroethylene-containing mixed powder (Comparative Example 1,
2), to which polytetrafluoroethylene fine powder (CD123 manufactured by Asahi ICI) was added (Comparative Example 3)
To 6) were similarly evaluated. Table 1 shows the results.

[0060]

[Table 1]

[0061]

As described above, the polyamide resin composition of the present invention has a high melt tension, and thus has excellent workability in blow molding and the like, and also has excellent surface properties of the obtained molded article. Molded articles obtained from the resin composition of the present invention are used for various applications such as automobiles, electricity, and miscellaneous goods.

Claims (1)

[Claims] 1. A polytetrafluoroethylene-containing mixed powder (B) comprising polytetrafluoroethylene particles having a particle diameter of 10 μm or less and an organic polymer is mixed with 100 parts by weight of a polyamide resin (A). A polyamide resin composition blended so that the fluoroethylene component is 0.0001 to 20 parts by weight.