KR910008622B1 - Polyamide resin composition - Google Patents

Abstract

A polyamide resin composition is composed of 100 wt. parts. of polyamide resin and 2-50 wt. parts. of ionomer of formula (IV) [N = 5-1000; M = Na or Zn i.e. metal salt of carboxyl gp.branched ethylene-methacrylic acid copolymer. The polyamide resin is composed of 5-95 wt. parts. nylon-46 resin of formula (I) [n = 50-200 , and 5-95 wt. parts. nylon-66 resin of formula (II) [n = 35-180 , nylon- 6 resin of formula (III) [n = 120-250 and/or its copolymer. The polyamide resin composition has a good impact-resistance and heat-resistance.

Description

Polyamide Resin Composition

The present invention relates to a polyamide resin composition having excellent impact resistance and thermal properties.

In general, polyamide resins are rapidly increasing their use as electrical engineering, electronics, building materials, and industrial materials as engineering plastics due to their excellent physical properties.

In particular, in the field where high impact resistance is required, the polyamide resin itself has insufficient impact resistance, and therefore, an improvement method has been studied. However, as the required characteristics of these resins gradually diversified, various reforming methods were proposed. For example, (1) a mixture of a polyamide resin and an ethylene-vinyl acetate copolymer (Japanese Patent Laid-Open No. 77-47052)

(2) Copolymer composed of nylon-6 or nylon-66 resin and ethylene-methacrylic acid copolymer (Japanese Patent Laid-Open No. 79-31497)

(3) a copolymer composed of a polyamide resin and a polypropylene resin (Japanese Patent Laid-Open No. 81-28241)

(4) Copolymers composed of polyamide resin and ethylene-propylene synthetic rubber (JP-A 79-103496)

(5) Copolymers composed of ethylene-propylene synthetic rubber modified with a carboxyl group in a single nylon-46 resin (Korean Patent Publication No. 86-1556) have been proposed as an improvement method.

However, the method of (1) to (4) of the above method is a conventional disadvantage that the composition using the nylon-6, nylon-66 or Nyron-6 / 66 copolymer has improved impact resistance, while the mechanical properties are sharply lowered Although the method of (5) supplements the weak points of (1) to (4), when the synthetic rubber is contained in a high content due to the high viscosity of the ethylene-propylene synthetic rubber itself, the processability is not easy. have.

Thus, the present inventors have carefully studied the improvement of the impact resistance and heat resistance of the polyamide resin in consideration of the deficiencies of the conventional method, and as a result, the mechanical properties are not deteriorated and the polyamide resin composition having impact resistance and excellent thermal properties is completed. Reached.

The present invention is described in more detail as follows.

The present invention relates to 5 to 95 parts by weight of nylon-46 resin of general formula (I), nylon-66 resin of general formula (II), or nylon-6 resin of general formula (III), or copolymers 95- to these. It is made by adding 2-50 parts by weight of the ionomer of the general formula (IV), which is a metal salt of an ethylene-methacrylic acid copolymer having a branched carboxyl group, to 100 parts by weight of the polyamide resin formed by 5 parts by weight.

The preparation of nylon-46 used in the present invention is a copolymer of adipic acid and 1.4-diaminobutane, which is referred to as "Journal of Polymer Science" volume 15 (1977) pages 537-545 and Dutch patents 8,001,736 and 8,001,764. It is described in detail in.

The nylon-46 used in the present invention preferably has a relative viscosity of 2.5 to 5.0 (analysis of a solution containing 1 g of a polymer in 100 ml of 96 wt% sulfuric acid at 20 ° C), and nylon-6 is a conventional method of capro. It is preferable to use ring-opening polymerization of a comonomer such as lactam, which has a state viscosity of 2.4 to 3.0 (analysis of a solution containing 1 g of polymer in 100 ml of 96 wt% sulfuric acid at 20 ° C), and nylon-66 is a hexamethylene diamine. Condensation reaction with and adipic acid is preferred to use a relative viscosity of 2.4 to 3.5 (analysis of a solution containing 1 g of polymer in 100 ml of 96% by weight sulfuric acid at 20 ° C).

The reason is that if it is less than the above range, the mechanical strength is poor, and if it exceeds the above range, the flowability and surface glossiness are poor, which is not good.

In addition, it is appropriate that the ionomer as an impact agent used in the polyamide composition of the present invention has a metal chloride in the range of 20 to 50% in the ethylene-methacrylic acid copolymer, and when it exceeds the above range, the impact resistance of the ionomer itself is exceeded. Is lost, and below that, the thermal properties are very unstable.

The preparation of the polyamide resin composition of the present invention can be obtained by mixing the composition of the present invention at a temperature of 290 to 320 ° C. in a kneader such as a batch kneader or a continuous mixer and an extruder having one or two screws. . Furthermore, various additives such as reinforcing agents, fillers, pigments, stabilizers, compatibilizers, antioxidants, lubricants and antistatic agents may be added to the polyamide compositions of the present invention.

The product made of the polyamide resin composition of the present invention has excellent thermal properties without deteriorating the overall mechanical properties due to the improvement of impact resistance compared to the conventional impact resistant polyamide resin products, and thus can be widely used as a material for automobile parts and industrial materials. have.

Example 1

80% by weight of nylon-6 with relative viscosity of 2.6, melting temperature of 224 ° C, number average molecular weight (Mn = 28,000) and 20% by weight of nylon-46 (Mn = 18,000) of relative viscosity of 3.3 and melting temperature of 295 ° C. 100% by weight of polyamide resin, 60% neutralized ethylene-methacrylic acid copolymer (Mn = 17,000) in a composition ratio of 20% by weight, and kneading extrusion in a melt kneading extruder that maintains a cylinder temperature of 300 to 330 ° C. After the molding chip was manufactured, the molding chip was dried in a hot air dryer at a temperature of 120 ° C. for about 6 hours, and then subjected to a dumbbell specimen and a 1/4 inch thickness impact test using a screw injection molding machine at 300 to 330 ° C. Specimen was produced.

The specimens were measured according to ASTM D638, ASTM D256, and ASTM D648, (264 PSI) standards under 23 ° C atmosphere.

Example 2

Zn is 60 parts by weight in 100 parts by weight of a polyamide resin composition composed of 50% by weight of nylon-6 (Mn = 28,000) and 50% by weight of nylon-46 (Mn = 18,000) each having the same relative viscosity as in Example 1. It was made into 20 weight% of ethylene-methacrylic-acid copolymer (Mn = 22,000) neutralized by% neutralization, and it produced and tested by the method similar to Example 1.

Example 3

Ethylene 6-6 (Mn = 28,000) and Nylon-46 (Mn = 18,000) each having the same relative viscosity as in Example 1, with 100% by weight of polyamide resin composition having a weight ratio of 20/80. -It was made into the methacrylic acid copolymer (Mn = 22,000) 20weight%, and tested by the same method as Example 1.

Example 4

Polyamide resin 100 having a composition ratio of 80% by weight of nylon-66 (Mn = 37,000) having a relative viscosity of 2.8 and a melting temperature of 264 ° C., and 20% by weight of nylon-46 (Mn = 18,000) having a relative viscosity of 23.3 and a melting temperature of 295 ° C. A molding chip was prepared by kneading and extruding in an extruder for melt kneading which maintains a cylinder temperature of 300 to 330 ° C. with a composition ratio of 20 wt% of ethylene-methacrylic acid copolymer (Mn = 17,000) neutralized with 60% sodium by weight. Then, the forming chip was dried at a temperature of 120 ° C. for 6 hours using a hot air dryer, and a dumbbell specimen and a 1/4 inch thick impact test specimen were manufactured using a screw injection molding machine at 300 to 330 ° C.

Thus, the specimens were measured under a 23 ° C atmosphere in accordance with ASTM D638, Impact Strength ASTM D256 and Heat Deflection Temperature according to ASTM D648 (264 PSI).

Example 5

60% sodium was neutralized in 100 parts by weight of a polyamide resin composition having a weight ratio of 50/50 of nylon-66 (Mn = 37,000) and nylon-46 (Mn = 18,000) each having the same relative viscosity as in Example 4. 20 wt% of the prepared ethylene-methacrylic acid copolymer (Mn = 17,000) was tested in the same manner as in Example 1.

Example 6

60% neutralization of zinc in 100 parts by weight of a polyamide resin composition having a weight ratio of 20/80 of nylon-6 (Mn = 28,000) and nylon-46 (Mn = 18,000) each having the same relative viscosity as in Example 4 20 wt% of the prepared ethylene-methacrylic acid copolymer (Mn = 22,000) was prepared and tested in the same manner as in Example 1.

Comparative Example 1

Example 1 was prepared by mixing 20 parts by weight of ethylene-methacrylic acid copolymer (Mn = 17,000) with 60% sodium neutralized to 100 parts by weight of nylon-6 (Mn = 28,000) having the same relative viscosity as in Example 1. Production test in the same manner as.

Comparative Example 2

20 parts by weight of 60% neutralized ethylene-methacrylic acid copolymer (Mn = 17,000) in which sodium was neutralized to 100 parts by weight of nylon-66 (Mn = 37,000) each having the same relative viscosity as in Example 4, and then Production test was carried out in the same manner as in Example 4.

Claims (1)

5 to 95 parts by weight of nylon-46 resin of formula (I), nylon-66 resin of formula (II) or nylon-6 resin of formula (III), or a copolymer of these A polyamide resin composition formed by adding 2 to 50 parts by weight of an ethylene-methacrylic acid copolymer of the general formula (IV) with respect to 100 parts by weight of a polyamide resin formed by addition.