JPH059379A - Polyamide resin composition - Google Patents

Abstract

PURPOSE:To obtain a polyamide resin composition having excellent flame- retardance and tracking resistance and suitable for electronic part, automobile part, etc., by compounding a polyamide resin with a halogen-based flame- retardant and a polyolefin resin. CONSTITUTION:The objective polyamide resin composition is produced by compounding (A) 100 pts.wt. of a polyamide resin having an average molecular weight of preferably 9,000-30,000 with (B) 10-150 pts.wt. (preferably 15-70 pts.wt.) of a halogen-based flame-retardant (e.g. tetrabromobisphenol A, brominated polystyrene or chlorinated polyphenyl), (C) 3-300 pts.wt. (preferably 10-100 pts.wt.) of a polyolefin resin (preferably polyolefin modified with maleic anhydride or its combination with a polyolefin) and, as necessary, (D) 1-5 pts.wt. (based on 10 pts.wt. of the component B) of a flame-retarding assistant (preferably antimony trioxide, etc.), 5-60wt.% (based on the composition) of a reinforcing agent (e.g. glass fiber or talc), a light- or heat-stabilizer, a mold-releasing agent, a colorant, etc.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a polyamide resin composition, and more particularly to a flame-retardant polyamide resin composition having excellent tracking resistance.

[0002]

2. Description of the Related Art Polyamide resins have been widely used in various applications since they have excellent physical and chemical properties. Among them, since they have excellent tracking resistance, they are used for electronic parts, automobile parts, and electric lighting equipment. It is useful as a molding material for switches.

When a polyamide resin is used for such purposes, various flame retardants are added to make it flame-retardant, and particularly when a halogen-based flame retardant is used, the tracking resistance may be significantly impaired. found.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned drawbacks of flame-retardant polyamide resin and to provide a flame-retardant polyamide resin composition having excellent tracking resistance.

[0005]

As a result of various studies to achieve the above object, the present inventors have found that a polyolefin resin is added to a composition containing a polyamide resin and a halogen-based flame retardant. It was found that a resin composition excellent in both tracking resistance and flame retardancy can be obtained, and the present invention was completed.

That is, the present invention relates to a polyamide resin composition containing a polyamide resin, a halogen flame retardant and a polyolefin resin,
More specifically, the halogen-based flame retardant is usually 10 to 150 parts by weight, preferably 15 to 70 parts by weight, and the polyolefin-based resin is usually 3 to 100 parts by weight of the polyamide resin.
To 300 parts by weight, preferably 10 to 100 parts by weight, relating to the polyamide resin composition.

Since the polyamide resin composition of the present invention has excellent tracking resistance and flame retardancy, it is preferably used in the fields of application where these properties are particularly required. For example, connectors, trimmer potentiometers, coil bobbins. , It is very useful as a molding material for electronic parts such as flyback transformers, distributor caps, automobile parts such as ignition coil bobbins, and switches for electric lighting equipment.

The polyamide resin in the present invention is one having an acid amide bond (-CONH-) in the molecule, specifically, ε-caprolactam, 6-aminocaproic acid, ω-enanthlactam, 7-amino. Heptanoic acid, 11-aminoundecanoic acid, 9-aminononanoic acid,
Polymers or copolymers obtained from α-pyrrolidone, α-piperidone, etc .: Hexamethylenediamine, nonamethylenediamine, undecamethylenediamine, dodecamethylenediamine, metaxylylenediamine and other diamines and terephthalic acid, isophthalic acid, adipine Examples thereof include polymers or copolymers obtained by polycondensing an acid or a dicarboxylic acid such as sebacic acid, or blends thereof, but are not limited thereto.

Of the above polyamide resins, those having an average molecular weight of 9,000 to 30,000 are preferably used.

The halogen-based flame retardant used in the present invention may be either bromine-based or chlorine-based, and examples of the bromine-based flame retardant include tetrabromobisphenol A, decabromodiphenyl ether and octabrom diphenyl ether. , Hexabromocyclododecane, bistribromophenoxyethane, polydibromophenylene oxide, tetrabromophthalic anhydride, TBA carbonate oligomer, polystyrene bromide, etc. Examples include decane and hexachlorocyclopentadiene derivatives, but the present invention is not limited thereto.

These flame retardants are polyamide resin 100
It may be added in an amount of usually 10 to 150 parts by weight, preferably 15 to 70 parts by weight, based on parts by weight.

In the present invention, it is also possible to use a flame retardant auxiliary together with the above halogen-based flame retardant, and as the flame retardant auxiliary, antimony trioxide, antimony pentoxide,
Preferred examples include zirconium oxide,
It is not limited to these.

The above flame retardant aid is used in an amount of 1 to 5 parts by weight with respect to 10 parts by weight of the halogen-based flame retardant.

Examples of the polyolefin resin used in the present invention include polyethylene resin, polypropylene resin, modified polyethylene resin and modified polypropylene resin, and specifically, ethylene-vinyl acetate (EVA) copolymer. , Ethylene-vinyl acetate-unsaturated carboxylic acid copolymer, ethylene-ethyl acrylate (E
EA) copolymer, ethylene-methyl acrylate (EM
A) Copolymer, ethylene-methyl methacrylate (EMM
A) copolymer, ethylene-acrylic acid (EAA) copolymer, ethylene-methacrylic acid (EMAA) copolymer, ethylene-glycidyl methacrylate (EGMA) copolymer, ethylene-glycidyl methacrylate-VA, EA copolymer Polymer, ethylene-crosslinking site-containing monomer copolymer,
Ethylene-crosslinking site-containing monomer-methyl acrylate copolymer, ethylene-aminoalkyl methacrylate copolymer, ethylene-hydroxyalkyl methacrylate copolymer, ethylene-styrene copolymer, ethylene-vinylsilane copolymer, ethylene- Ethylenic copolymers such as maleic anhydride-acrylic acid copolymers, ethylene-carbon monoxide- (VA) copolymers, ethylene-ring-opening polymerizable monomer copolymers, ethylene-macromonomer copolymers,
Graft copolymers such as unsaturated carboxylic acid graft polyethylene, vinylsilane graft polyethylene, vinyl monomer graft polyethylene, vinyl monomer graft ethylene-based copolymer, chlorinated polyethylene, chlorosulfonated polyethylene, saponified EVA, ionomer (metal ion of EMAA Examples thereof include cross-linked products), acid-modified polyethylene with maleic anhydride, acid-modified polypropylene, ethylene propylene rubber (EPR), acid-modified EPR, and the like, but are not limited thereto.

Among these polyolefin resins,
The maleic anhydride-modified polyolefin and the combination of the polyolefin and the maleic anhydride-modified polyolefin are particularly preferable in view of mechanical properties.

The above-mentioned polyolefin resin is usually 3 to 300 parts by weight with respect to 100 parts by weight of polyamide resin,
It is preferably added in a ratio of 10 to 100. If the amount of the polyolefin-based resin added is too small, the effect of improving the tracking resistance may not be sufficient or the effect may not be obtained stably. On the contrary, if the amount is too large, flame retardancy may result. There is a possibility that it may decrease, and that mechanical properties (bending strength) and heat resistance (heat deformation temperature) may also decrease.

In addition to the above-mentioned components, for example, a reinforcing agent, a release agent, a light or heat stabilizer, a colorant, etc. may be added to the polyamide resin composition of the present invention according to various purposes of use. You can

The reinforcing agents include fibrous reinforcing agents and filler-like reinforcing agents. The fibrous reinforcing agents include glass fiber and carbon fiber, and the filler-like reinforcing agents include talc, mica and wollastonite. , Calcium carbonate, silica, kaolin, montmorillonite, clay and the like, but the present invention is not particularly limited thereto.

The amount of the reinforcing agent added is usually 5 to 60% by weight, preferably 10 to 35, relative to the polyamide resin composition.
It is good to make it a ratio of weight%. If this amount is too small, it is difficult to obtain the desired reinforcing effect, and if it is too large, the moldability and the appearance of the molded product deteriorate.

[0020]

EXAMPLES Next, the present invention will be described more specifically by showing Examples and Comparative Examples, but it goes without saying that the present invention is not limited to these Examples.

Examples 1 to 10 100 parts by weight of polyethylene and polypropylene, 0.8 parts by weight of maleic anhydride and Perkmill D
(F) (Peroxide) (0.2 parts by weight) was added, and the mixture of the two kinds was extruded by a 35φ twin-screw extruder, cooled and cut to prepare modified polyethylene and modified polypropylene pellets.

As a polyamide resin, nylon-6 (manufactured by Toyobo Co., Ltd., trade name T-803, molecular weight 12,000)
Or nylon-66 (manufactured by Toyobo Co., Ltd., trade name F
662, molecular weight 17,000), and 100 parts by weight of this polyamide resin, polypropylene, one or more polyolefin-based resins composed of the modified polyethylene and modified polypropylene obtained as described above, in the proportions shown in Table 1, respectively. In addition, as a flame retardant, brominated polystyrene (manufactured by Nissan Fellow Organic Chemical Co., Ltd., trade name Pyrocheck 68PB) or decabromodiphenyl ether (manufactured by Sanbon Sangyo Co., Ltd., trade name DE-83R).
Was added with antimony trioxide as a flame retardant aid and glass fiber (GF) or talc as a reinforcing agent at the ratios shown in Table 1, to obtain polyamide resin compositions of Examples 1 to 10.

Comparative Examples 1 to 7 Table 1 shows a resin composition containing no polyolefin resin (Comparative Examples 1 to 5) and a resin composition containing no polyamide resin (Comparative Examples 6 and 7) as Comparative Examples. It was obtained by blending in the composition ratio as described above.

[0024]

[Table 1]

Experimental Example To the resin compositions of Examples 1 to 10 and Comparative Examples 1 to 7, 0.2% by weight of Mg stearate was added as a mold release agent, and 35 φ
The resin composition was extruded with a twin-screw extruder, cut after cooling, and pellets (2.5φ × 2.5 l) of the resin compositions of Examples 1 to 10 and Comparative Examples 1 to 7 were obtained. 80 these pellets
After vacuum drying at 16 ° C for 16 hours, a test piece for characteristic value evaluation was prepared by injection molding.

The test pieces thus produced were evaluated for tracking resistance, flame retardancy, bending strength, bending elastic modulus, and heat deformation temperature.

The evaluation test shows that the tracking resistance is
IEC PuBl 112, flame retardancy was UL Standard Subject 94, and bending strength was ASTM D-790. The results are shown in Table 2.

[0028]

[Table 2]

As is clear from the results shown in Table 2,
It can be seen that the polyamide resin composition of the present invention is excellent in both tracking resistance and flame retardancy.

[0030]

As described above, the present invention improves tracking resistance by adding a polyolefin resin to a polyamide resin composition containing a flame retardant. According to the present invention, tracking resistance is improved. A polyamide resin composition having excellent flame retardancy and flame retardancy can be obtained.

Claims (1)

Claim: What is claimed is: 1. A polyamide resin composition comprising a polyamide resin, a halogen-based flame retardant, and a polyolefin-based resin.