KR940004866B1 - Polyamide-polycarbonate resin composition - Google Patents

Abstract

Polyamide polycarbonate resin composition comprises 10-80 wt.% of polyamide; 10-60 wt.% of polycarbonate; and 10-30 wt.% of the copolymer to be added with 1-5 mole pts. of monomer contg. polar gp. when polymerizing acrylonitrile-butadiene-styrene graft copolymer. Pref. the compsn. has fibric or inorg. filler, heat stabilizer, lubricant, coloring agent or plasticizer, or other additives. The obtd. resin compsn has excellent impact resistance, heat resistance and mechanical hardness and is useful for the car components or electric devices of injection molding or extruding molding.

Description

[Name of invention]

Polyamide Polycarbonate Resin Composition

The present invention relates to a polyamide polycarbonate resin composition, and more particularly, to a polyamide polycarbonate resin composition having excellent impact resistance and toughness at room temperature and a temperature of 0 ° C. or less, and having improved heat resistance and mechanical strength.

In general, the alloys of polycarbonate resins and acrylonitrile-butadiene-styrene graft copolymers among polymer alloys have excellent thermal and mechanical properties, are most suitable in terms of price and performance, and products are already on the market. A number of patents have also been proposed for the resins. (US Pat. Nos. 3,130,177,4218544,447,554,4515921,4522979,4526926,4554315,4564654,4595729, 4603169, Japanese Patent Laid-Open Nos. 52-63954, 58-11540, European Patent No. 0074112, etc.). However, in the related art, there was a limit in improving the impact strength because the mixing law between the two resin alloys was not deviated, and in particular, the two resin alloys had a problem in that the flexibility was inferior, requiring careful attention when used in a molded article requiring flexibility. It became. Therefore, an alloy of highly flexible polyamide resin and acrylonitrile-butadiene-styrene graft copolymer resin has been developed, which converts a part of the graft copolymer resin into reactive acrylic acid or maleic anhydride. In this way, these reactive functional groups react with the nylon resin to improve the interfacial adhesion between the two resins, thereby improving flexibility and impact resistance (US Patent No. 3134764, European Patent No. 00820720, Japanese Patent Laid-Open No. 58-71951, etc.). . However, such a resin composition has a disadvantage in that the heat distortion temperature is relatively low and unsuitable for high temperature molded products.

Recently, a nylon / polycarbonate resin alloy has been proposed that combines the excellent mechanical properties of polycarbonate resin with the excellent processability of nylon to increase impact strength, formability and flexibility (Japanese Patent Application Laid-Open No. 59-68368). Polycarbonate resin alloys have excellent electrical properties, whereas delamination has occurred and impact strength has been reduced in molded articles. Since this phenomenon is caused by the lack of compatibility between polycarbonate resin and nylon, a method of increasing compatibility between two resins is disclosed in US Pat. Nos. 4,862,114 and 478117, but this method is also complicated in manufacturing process. In practice, various problems are tens of thousands of uses, and in terms of impact strength and flexibility, they fall short of the nylon / acrylonitrile-butadiene-styrene copolymer alloy.

Therefore, the present inventors have studied diligently to solve the problems of conventional alloys as described above, that is, polycarbonate / styrene graft copolymer alloy, nylon / styrene graft alloy and polycarbonate / nylon alloy. As a result, in general, when two or more polymer materials form an alloy, the properties of the final product largely depend on the compatibility and morphology of the constituent polymers, and in particular, the interfacial adhesion between these polymers is a property of the resin composition. In view of the fact that the styrene graft copolymer containing butadiene, an impact-resistant high-part component, is present at the interface between nylon and polycarbonate in a proper manner, high impact strength is achieved even at room temperature and low temperature. It has been found that it can provide a resin composition having excellent heat resistance, flexibility and mechanical strength It led to the people.

Hereinafter, the present invention will be described in detail.

The present invention is a polyamide polycarbonate resin composition comprising 10 to 80% by weight of polyamide, 10 to 60% by weight of polycarbonate and 10 to 30% by weight of acrylonitrile-butadiene-styrene graft copolymer.

In the polyamide polycarbonate resin composition according to the present invention, polyamide, that is, nylon, has a molecular weight of 500 or more, which is a polymer of aliphatic lactams, aliphatic diamines, and aliphatic dicarboxylic acids such as polar caprolactam (nylon 6). Polymethylene adipamide (nylon 66) and polyhexamethylene sebacamide (nylon 6,10). Such nylon is described in detail in US Pat. Nos. 2071250, 2012551, 2130523, 2130948, 22241322, 2312966, 2512906, and 3393210.

In addition, the polycarbonate used in the present invention is represented by the following structural formula (I), when the content is less than 10% by weight relative to the total resin, the strength and heat deformation temperature is lowered, while if it exceeds 60% by weight delaminated Since the development is intensified, it is preferable to contain 10 to 60% by weight based on the total resin as described above. Manufacturing methods for this are described in US Pat. Nos. 3,584,14,315,3008, German Patent Nos. 1046311, 9622741, 2999846, 2999835, 2964974, 39122638, and the like.

In the above formula, R ₁ and R ₂ are a hydrogen atom, an alkyl group having 1 to 6 carbon atoms or a phenyl group, n is an integer of 40 to 300.

A typical polycarbonate is a method of polymerizing 2,2-bis (4-hydroxydiphenyl) propane (bis phenol A) and phosgene in an organic solvent, which is described in detail in US Pat. No. 3028365.

As the graft copolymer used in the present invention, a commonly used arch copolymer, for example, an acrylonitrile-butadiene-styrene copolymer (hereinafter referred to as ABS) may be used, and a specially modified ABS may be used. Typical ABS polymers are described in US Pat. Nos. 2679804, 3168593, 33243481, 3426103, and 3660535. In the present invention, polymerized common ABS is also used in this manner. Specially modified ABS is a general ABS is a method of having a physical bonding force by adding 1 to 5 mole parts of a monomer having a polar group (polar group) in general ABS polymerization, the monomer containing a polar group is a polymerizable ethylenically unsaturated compound ( polymerizable ethylenically unsaturated compound and having a group moment of 1.4 to 4.4 Debye, for example Etc. Representative examples of these monomers include acrylonitrile, methacrylonitrile, fumaronitrile alkylacrylate, methyl methacrylate, acrylic acid, methacrylic acid and the like.

Another modified ABS resin is a method of adding 0.1 to 0.5 mol% of maleic hydride capable of reacting with amine or acid in the end group of nylon in the general ABS resin manufacturing process.

The modified ABS used in the present invention is 25 parts by weight of butadiene, 44 parts by weight of styrene, 5 parts by weight of maleic hydride, and the manufacturing method used the method of US Patent No. 3660535. In this case, when the maleic anhydride is used in an amount of 10 parts by weight or more, the thermal stability of the deformed ABS is deteriorated.

As described above, the content of the butadiene-containing graft copolymer is preferably 10 to 30% by weight based on the total resin, where the impact strength is lowered when the content is less than 10% by weight, while 30% by weight. Exceeding this will lower the heat deflection temperature.

The polyamide polycarbonate resin composition according to the present invention thus obtained is excellent in impact strength even at room temperature and low temperature, and significantly improved in heat resistance, flexibility and mechanical strength.

Hereinafter, the present invention will be described in more detail based on Examples.

EXAMPLE

The composition according to Table 1 was melt mixed with a twin screw compressor, but the barrel temperature was adjusted to 200 ° C. to 255 ° C., and the resulting spaghetti was used by immersion with a cutter.

The chip was manufactured by an ASTM standard with an injection molding machine to measure tensile strength, flexural strength, flexural modulus, impact strength, and heat deflection temperature. The melting temperature was 80 ° C.

TABLE 1

Composition of composition

The physical properties of the resins according to the examples and the Vicyo are shown in Table 2 below.

TABLE 2

[Properties of Composition]

1) Measured at 250, load 5 kg.

The resin composition according to the present invention eliminates the delamination that occurs in the polycarbonate and nylon compositions during molding, and when the modified ABS is added to the polycarbonate / nylon composition (Examples 8 to 11) and polycarbonate When the general ABS and modified ABS are simultaneously added to the nylon composition (Examples 8 to 11) and the general ABS and the modified ABS are simultaneously added to the polycarbonate / nylon composition (Examples 12 to 14) Excellent performance in impact strength, heat deflection temperature and elongation. In this case it is well suited for moldings which require impact resistance, high heat deflection temperatures and high ductility.

In addition, the resin composition is a resin composition that maximizes the flowability of nylon, and is easy to manufacture a molded article, and is particularly suitable for injection and extrusion molded articles such as automotive parts and electric / electronic parts requiring high impact resistance, heat resistance, and ductility. .

In addition, the resin composition according to the present invention may be suitably blended with conventional additives such as fibrous or inorganic neutral agent, thermal stabilizer, lubricant, flame retardant, colorant or plasticizer as necessary within the scope of not impairing the object of the present invention. .

Claims (1)

10 to 80% by weight of polyamide, 10 to 60% by weight of polycarbonate and 10 to 30% by weight of an arch polymer having 1 to 5 mol parts of a monomer having a polar group added during polymerization of a general acrylonitrile-butadiene-styrene graft copolymer Polyamide polycarbonate resin composition, characterized in that.