ABS-BASED RESIN COMPOSITION, METHOD OF PREPARING THE SAME, AND MOLDED ARTICLE INCLUDING THE SAME

Abstract

Disclosed is an ABS-based resin composition, a method of preparing the same, and a molded article including the same, including an ABS-based resin composition including 100 parts by weight of a base resin including 20 to 40% by weight of a vinyl cyanide compound-conjugated diene compound-aromatic vinyl compound graft copolymer and 60 to 80% by weight of an aromatic vinyl compound-vinyl cyanide compound copolymer; and 0.1 to 5 parts by weight of a polyether-modified polysiloxane, a method of preparing the ABS-based resin composition, and a molded article including the ABS-based resin composition.

Claims

1. An ABS-based resin composition comprising: 100 parts by weight of a base resin comprising 20 to 40% by weight of a vinyl cyanide compound-conjugated diene compound-aromatic vinyl compound graft copolymer and 60 to 80% by weight of an aromatic vinyl compound-vinyl cyanide compound copolymer; and 0.1 to 5 parts by weight of a polyether-modified polysiloxane.

2. The ABS-based resin composition according to claim 1, wherein the polyether-modified polysiloxane is a polydialkylsiloxane modified with an alkylene oxide.

3. The ABS-based resin composition according to claim 1, wherein the polyether-modified polysiloxane comprises one or more selected from the group consisting of a branched polyether-modified polysiloxane, a terminal polyether-modified polysiloxane, and a branched terminal polyether-modified polysiloxane.

4. The ABS-based resin composition according to claim 1, wherein the polyether-modified polysiloxane has a weight average molecular weight of 10,000 to 50,000 g/mol.

5. The ABS-based resin composition according to claim 1, wherein the vinyl cyanide compound-conjugated diene compound-aromatic vinyl compound graft copolymer comprises 40 to 80% by weight of conjugated diene rubber, 10 to 40% by weight of an aromatic vinyl compound, and 1 to 20% by weight of a vinyl cyanide compound.

6. The ABS-based resin composition according to claim 1, wherein the aromatic vinyl compound-vinyl cyanide compound copolymer comprises 60 to 80% by weight of an aromatic vinyl compound and 20 to 40% by weight of a vinyl cyanide compound.

7. The ABS-based resin composition according to claim 1, wherein the aromatic vinyl compound-vinyl cyanide compound copolymer has a weight average molecular weight of 50,000 to 200,000 g/mol.

8. The ABS-based resin composition according to claim 1, wherein the ABS-based resin composition comprises 0.1 to 5 parts by weight of an inorganic pigment.

9. The ABS-based resin composition according to claim 8, wherein the inorganic pigment is carbon black.

10. The ABS-based resin composition according to claim 1, wherein the ABS-based resin composition has a color L value of 28.5 or less as measured using a color difference meter.

11. The ABS-based resin composition according to claim 1, wherein the ABS-based resin composition has a gloss of 86 or more as measured at 45° using a gloss meter VG7000.

12. The ABS-based resin composition according to claim 1, wherein the ABS-based resin composition has an impact strength of 30 kgf cm/cm or more as measured using a specimen comprising the ABS-based resin composition and having a thickness of ⅛″ according to ASTM D256.

13. A method of preparing an ABS-based resin composition, comprising: melt-kneading 100 parts by weight of a base resin comprising 20 to 40% by weight of a vinyl cyanide compound-conjugated diene compound-aromatic vinyl compound graft copolymer and 60 to 80% by weight of an aromatic vinyl compound-vinyl cyanide compound copolymer; and 0.1 to 5 parts by weight of a polyether-modified polysiloxane under conditions of 200 to 250° C. and 100 to 400 rpm, and then performing extrusion.

14. A molded article, comprising the ABS-based resin composition according to claim 1.

Description

EXAMPLES

[0102] Components used in Examples and Comparative Examples below are as follows:

[0103] (A) Vinyl cyanide compound-conjugated diene compound-aromatic vinyl compound graft copolymer by emulsion polymerization: DP270 (LG Chemical Co.) including 60% by weight of a butadiene polymer having an average particle diameter of 300 nm, 10% by weight of acrylonitrile, and 30% by weight of styrene was used.

[0104] (B) Aromatic vinyl compound-vinyl cyanide compound copolymer: 92HR (LG Chemical Co.) having a weight average molecular weight of 130,000 g/mol including 27% by weight of acrylonitrile was used.

[0105] (C-1) Polyether-modified polysiloxane: Polyether-modified polydimethylsiloxane (BYK-333) was used.

[0106] (C-2) Polyether-modified polysiloxane: Polyether-modified polydimethylsiloxane (BYK-378) was used.

[0107] (C-3) Unmodified polysiloxane: Polydimethylsiloxane (KF-96-100cs, Shin-Etsu Silicone Co.) was used.

[0108] (D) Inorganic pigment: Carbon black master batch (product name: BK50, Muil Hwasung Co.) was used.

Examples 1 to 4 and Comparative Examples 1 to 3

[0109] According to the contents shown in Table 1, the components shown in Table 1 were introduced into a twin-screw extruder, and melt-kneading and extrusion were performed at 220° C. and 600 rpm to prepare ABS-based resin composition pellets. In addition, the ABS-based resin composition pellets were dried at 80° C. for 3 hours, and then were injection-molded using an injection machine under conditions of an injection temperature of 220° C., a mold temperature of 60° C., and an injection speed of 30 mm/sec to prepare a specimen for measuring physical properties.

Test Examples

[0110] The properties of the specimens prepared in Examples 1 to 4 and Comparative Examples 1 to 3 were measured according to the following methods, and the results are shown in Table 1 below. [0111] Izod impact strength (kgf.Math.cm/cm): Izod impact strength was measured using a specimen having a thickness of ¼″ according to ASTM D256. [0112] Fluidity (g/10 min): Melt viscosity was measured under conditions of 220° C. and 10 kg according to ASTM D256. [0113] Gloss: Gloss was measured at 45° using a gloss meter VG7000 (⅛ inch injection gloss). [0114] Color L: The color L, a, and b values of a specimen were measured using a color difference meter (Color-Eye 7000A, SCI mode). For reference, the color “L” value is a numerical value indicating brightness. As the color “L” value decreases, the degree of blackness increases. The color “a” value is a numerical value indicating the degree of red and green. As the color “a” value decreases, the degree of green increases. The color “b” is a numerical value indicating the degree of yellow and blue. As the color “b” value decreases, the degree of blue increases. [0115] Chemical resistance (ESCR, seconds): A specimen having a size of 200 mm×12.7 mm×3.2 mm was fixed to a curved jig having a strain of 1.1%, 1 cc of thinner was applied thereto, and then time at which cracks occurred in the specimen was measured. When cracks did not occur until 600 seconds, the specimen was evaluated to have good chemical resistance. Specimens that satisfy the chemical resistance evaluation are indicated as >600.

TABLE-US-00001 TABLE 1 (Parts by Comparative Comparative Comparative weight) Example 1 Example 2 Example 3 Example 4 Example 1 Example 2 Example 3 A 25 25 25 25 25 25 25 B 75 75 75 75 75 75 75 C-1 0.5 2 C-2 0.5 2 C-3 0.5 2 D 1 1 1 1 1 1 1 Impact strength 34.3 33.4 30.4 34.1 27.6 28.0 28.0 Melt viscosity 18.8 21.8 19.8 22.1 19.0 19.2 21.5 Gloss 88.2 86.9 88.7 88.1 87.4 86.1 82.4 Color L 27.47 28.15 27.41 27.89 27.32 28.11 29.41 a 0.00 −0.08 −0.03 −0.06 −0.01 −0.09 0.20 b −0.93 −1.14 −0.92 −1.15 −0.93 −0.73 −0.13 ESCR 1 >600 >600 480 >600 245 458 >600 (second) 2 571 >600 522 >600 227 428 574 3 559 >600 411 >600 247 510 544

[0116] As shown in Table 1, compared to the ABS-based resin compositions (Comparative Examples 1 to 3) not including the polyether-modified polysiloxane according to the present invention or including the polyether-modified polysiloxane according to the present invention outside the content range of the present invention, in the case of the ABS-based resin compositions (Examples 1 to 4) according to the present invention, fluidity is maintained within a range that allows for easy processing, and all of impact strength, gloss, and colorability are excellent.

[0117] In summary, as in the conventional method, when polydimethylsiloxane is mixed as in Comparative Examples 2 and 3 to improve impact strength in the ABS-based resin composition of Comparative Example 1, a trade-off relationship in which impact strength is improved, but colorability and gloss are poor is observed. However, as in Examples 1 to 4, when the polyether-modified polysiloxane according to the present invention is mixed in a predetermined amount, the trade-off relationship disappears, and impact strength, colorability, and gloss are improved at the same time.