KR0160470B1 - Impact resistant resin compositions - Google Patents

Abstract

The present invention provides a resin composition excellent in impact resistance, 20-60 parts by weight of polycarbonate resin, the average molecular weight of 10000-80000, 48-78 parts by weight of ABS resin, 2-30 parts by weight of styrene copolymer resin and ethylene- It is composed of 0.1-10 parts by weight of polyfunctional grafted polystyrene on the main chain of ethyl acrylate-maleic anhydride, and is suitable for forming exterior parts for electric, electronic and automotive because of its excellent mechanical strength and molding processability.

Description

Impact Resistant Resin Composition

The present invention provides a high impact strength obtained by melt-mixing an impact resistant resin composition, more specifically, a polycarbonate resin, an ABS resin (acrylonitrile-butadiene-styrene graft copolymer), a styrene copolymer resin, and a polyfunctional compound. It relates to an impact resistant resin composition excellent in mechanical properties.

In general, ABS resin is characterized by excellent mechanical properties, excellent flowability during molding processing, excellent surface glossiness, and also has a low price and is widely used for various purposes in all of you. However, ABS resin has a disadvantage that can not be used in the field requiring heat resistance of more than 90 ℃.

Polycarbonate resins are widely used in various fields because of their excellent impact resistance, heat resistance, transparency and electrical properties, and good dimensional stability, whereas polycarbonate resins have high melt viscosity during molding, resulting in poor flowability and high price and surface gloss. This has a bad drawback.

In order to solve the problem of molding processability, it is possible to find a way to raise the molding temperature or lower the average molecular weight. However, high molding temperature causes thermal decomposition, which impedes obtaining a molded article with good appearance and stable physical properties. While the workability is good, the impact resistance is lowered and the releasability from the mold is worsened.

In order to improve this disadvantage, the addition of various resins has been proposed. That is, a method of blending a diene rubber graft resin such as ABS resin or ABS resin (methyl methacrylate-butadiene-styrene graft copolymer) to polycarbonate resin (JP-A No. 38-15225, No. 39). -71) is known. In addition, a method of blending a polycarbonate resin with an ABS resin produced by a suspension-suspension polymerization method (Japanese Patent Laid-Open No. 51-11142), and blending a graft copolymer of an aromatic vinyl compound and an unsaturated nitrile compound in a polycarbonate resin (German Patent Nos. 1170141, 1810993, Dutch Patent No. 7316731, 737332), and blending a graft copolymer of an aromatic vinyl compound with an unsaturated nitrile compound in the presence of butadiene rubber in a polycarbonate resin. Method (German Patent No. 1170141), Method of adding ABS resin (Acrylonitrile-ethylenepropylene diene rubber-styrene graft copolymer) to polycarbonate resin (US Patent No. 4550138), 5 to 50 to polycarbonate resin A method of blending an ABS resin having a rubber content of parts by weight and an ABS resin having a rubber content of 60 to 90 parts by weight (European Patent No. 520) 2) is known.

When ABS resin is added to polycarbonate resin, it has excellent surface gloss, excellent impact strength, and good heat resistance and good mechanical properties. However, in order to maintain such excellent mechanical properties, the content of polycarbonate must be increased. In this case, the processing temperature during injection molding is still high and the price is high. In order to improve the processability, it is possible to lower the content of polycarbonate and relatively increase the content of the styrene-acrylonitrile copolymer, but on the contrary, there is a disadvantage in that the physical properties such as impact strength deteriorate. In addition, when the ABS resin or the AES resin is added to the polycarbonate resin, the impact strength is good, but the problem of molding processability is still difficult, thus making it difficult to manufacture large molded articles.

MEANS TO SOLVE THE PROBLEM This inventor completed the present invention as a result of earnestly researching the method of improving the workability at the time of shaping | molding process, and improving impact resistance in melt-mixing polycarbonate resin and ABS resin.

That is, according to the present invention, 20 to 60 parts by weight of a polycarbonate resin containing an aromatic bisphenol unit and an average molecular weight of 10,000 to 80,000, a part of the aromatic vinyl compound and the vinyl cyanate compound may be a part of the conjugated diene rubber and the graft copolymer. 48 to 78 parts by weight of acrylonitrile-butadiene-styrene graft copolymer (ABS resin), 2 to 30 parts by weight of copolymer resin of styrene and olefin formed from diblock or triblock, and ethylene-ethylacrylate-maleic It is to provide a thermoplastic resin composition consisting of 0.1 to 10 parts by weight of the polyfunctional compound grafted polystyrene to the anhydride backbone.

In the present invention, the polycarbonate resin may be selected from an aromatic polycarbonate, an aliphatic polycarbonate or an aliphatic-aromatic polycarbonate resin, and preferably poly (bisphenol-A carbonate) polymerized by bisphenol-A and phosgene. The average molecular weight is 10.000 to 80,000, more preferably 20,000 to 50,000.

In the present invention, the ABS resin may be a resin composed of a graft copolymer of an aromatic vinyl compound and an aromatic cyanate compound, and a graft copolymer of an aromatic vinyl compound and a vinyl cyanate compound in the presence of a conjugated diene rubber. The content of the double conjugated diene rubber is 50 parts by weight or less, preferably 10 to 40 parts by weight. Because the high content of the conjugated diene rubber has a high impact strength, but the heat resistance is poor and the viscosity during the molding process has a disadvantage in that the processing temperature increases.

In the present invention, the styrene copolymer resin is a copolymer resin of styrene and olefin, and is an olefin monomer, and there are diblocks and triblocks of ethylene, propylene, 1-butene, 4-methyl-1-pentene butadiene, isoprene, etc. Styrene-butadiene-styrene (SBS), styrene-isoprene-styrene (SIS), and triblock include styrene-ethylene / butylene-styrene (S-EB-S), and the composition ratio of styrene and olefins varies. Since the diblock contains unsaturated olefins, the heat resistance and processability are somewhat inferior to those of the triblocks containing saturated olefins, and therefore, the triblock copolymer resin is preferably used in the present invention.

In the present invention, the polyfunctional compound has a ternary copolymer of an olefin-unsaturated carboxylic acid alkyl ester-maleic anhydride as a main chain, and polymethyl methacrylate, polystyrene, or polyacrylonitrile-styrene is grafted thereto. will be. The olefin monomer is ethylene, propylene, 1-butene, 4-methyl-1-pentene and the like, and the unsaturated carboxylic acid alkyl ester monomer is methyl acrylate, ethyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate. Acrylate, butyl methacrylate, hydroxyethyl acrylate, hydroxypropyl methacrylate and the like. Preferred polyfunctional compounds are those in which ethylene-ethylacrylate-maleic anhydride is the main chain and polystyrene is grafted at a weight ratio of 7/3.

In preparing the resin composition of the present invention, after mixing the composition in a super mixer, a single screw extruder or a twist screw extruder may be used, and the temperature during extrusion may be 210 ° C. to 260 ° C., preferably 220 ° C. to 240 ° C.

The resin composition prepared according to the present invention can obtain excellent mechanical properties such as improving the processability during molding processing while maintaining a high impact strength even while lowering the content of polycarbonate.

That is, the composition prepared according to the present invention has a high impact strength of 40 Kg.cm/cm or more in 1/4 inch and 70 Kg.cm/cm or more in 1/4 inch as measured by ASTM D256. With excellent mechanical properties such as improvement and excellent surface gloss and excellent impact resistance, it can be used as molded products for various sports products, exterior and parts of electric and electronic products, daily life products and automobile exteriors and parts.

The present invention is described in more detail in Examples and Comparative Examples as follows.

Example 1

30 parts by weight of polycarbonate (PC) resin having an average molecular weight of 22000, 65 parts by weight of ABS resin (997VE of Hyosung BASF), 5 parts by weight of KRATON G-1657 (styrene-ethylene / butylene-styrene) from Shell Chemicals 1 part by weight of A-8100 (polyethylene grafted with ethylene-ethyl acrylate-maleic anhydride as a main chain) of the pad company was added and mixed in a supermixer, and then mixed with a JSW twin screw extruder at 230 ° C to 250 ° C. Extrusion at temperature gave pellets. In order to measure mechanical properties, pellets were sufficiently dried at 90 ° C. for at least 4 hours, and then injected at a temperature of 220 ° C. to 240 ° C. using an ENGEL injection machine to obtain injection specimens for measurement of ASTM standards. Impact strength was measured by ASTM D256, tensile yield strength and elongation at break by ASTM D638, flexural strength by ASTM D790, and melt flow index (Melt Flow Index) by ASTM D1238. Shown in

Example 2-7

Table 1 shows the results of measuring the physical properties of the same resin as Example 1 by changing the content as shown in Table-1.

Comparative Example 1

30 parts by weight of polycarbonate (PC) resin with an average molecular weight of 22000 is ABS 997VE by Hyosung BASF, 65 parts by weight, and 5 parts by weight of Shell Chemical's Kraton G-1657 (styrene-ethylene / butylene-styrene), respectively. After mixing with a mixer, a pellet was obtained by compression at a temperature of 230 ° C to 250 ° C with a JSW twin screw extruder. In order to measure the mechanical properties, the pellets were sufficiently dried at 90 ° C. for at least 4 hours, and the physical properties of the specimens were measured 10 times using the ENGEL injection machine as in Example 1 of 220 ° C. to 240 ° C. Indicated.

Comparative Example 2-4

Table 1 shows the results of measuring the physical properties of the same resin as in Comparative Example 1 by varying the content as shown in Table-1.

Claims (1)

20 to 60 parts by weight of a polycarbonate resin containing an aromatic bisphenol unit and having an average molecular weight of 10,000 to 80,000, a part of the aromatic vinyl compound and the vinyl cyanate compound, wherein a part of the conjugated diene rubber and an acrylonitrile-graft copolymer- Butadiene-styrene graft copolymer (ABS resin) 48 to 78 parts by weight, copolymer resin of styrene and olefin formed of diblock or triblock 2 to 30 parts by weight, and polystyrene in the ethylene-ethylacrylate-maleic anhydride backbone A thermoplastic resin composition composed of 0.1 to 10 parts by weight of the grafted polyfunctional compound.