POLYCARBONATE ALLOY AND PREPARATION METHOD THEREOF

Abstract

The present invention discloses a polycarbonate alloy, including the following components in parts by weight: 80 parts of a polycarbonate; and 5 parts to 30 parts of an ethylene copolymer.

Claims

1. A polycarbonate alloy, comprising the following components in parts by weight: TABLE-US-00004 a polycarbonate 80 parts; and an ethylene copolymer  5 parts to 30 parts.

2. The polycarbonate alloy according to claim 1, comprising the following components in parts by weight: TABLE-US-00005 the polycarbonate 80 parts; and the ethylene copolymer 12 parts to 23 parts.

3. The polycarbonate alloy according to claim 1, wherein the ethylene copolymer is selected from at least one of an ethylene copolymer of acrylic acid, an ethylene-vinyl acetate copolymer, a styrene-butadiene-styrene copolymer, a styrene-ethylene-butadiene-styrene copolymer, and a styrene-ethylene-propylene-styrene copolymer; and the ethylene copolymer of acrylic acid is selected from at least one of an ethylene-methacrylic acid copolymer, an ethylene-ethyl acrylate copolymer, and an ethylene-butyl acrylate copolymer.

4. The polycarbonate alloy according to claim 3, wherein the ethylene copolymer is selected from the ethylene copolymer of acrylic acid.

5. The polycarbonate alloy according to claim 1, wherein the ethylene copolymer is selected from an ethylene copolymer containing a reactive active group, wherein the ethylene copolymer is selected from at least one of an ethylene copolymer of acrylic acid, an ethylene-vinyl acetate copolymer, a styrene-butadiene-styrene copolymer, a styrene-ethylene-butadiene-styrene copolymer, and a styrene-ethylene-propylene-styrene copolymer, the reactive active group is at least one of a maleic anhydride group and an epoxy group, and a grafting ratio of the reactive active group is 0.1% to 15%; and the ethylene copolymer of acrylic acid is selected from at least one of an ethylene-methacrylic acid copolymer, an ethylene-ethyl acrylate copolymer, and an ethylene-butyl acrylate copolymer.

6. The polycarbonate alloy according to claim 5, wherein the ethylene copolymer in the ethylene copolymer containing the reactive active group is selected from the ethylene copolymer of acrylic acid.

7. The polycarbonate alloy according to claim 1, wherein the polycarbonate is selected from an aromatic polycarbonate, an aliphatic polycarbonate, and an aromatic-aliphatic polycarbonate; and the polycarbonate has a weight average molecular weight of 18,000 to 28,000.

8. The polycarbonate alloy according to claim 1, wherein in parts by weight, further comprising 0 part to 10 parts of a processing aid and/or an additive.

9. A preparation method of the polycarbonate alloy according to claim 8, the method comprising the following steps: mixing the polycarbonate, the ethylene copolymer, the processing aid and/or the additive evenly according to a ratio in a high-speed mixer, so as to obtain a mixture; then adding the mixture into a twin-screw extruder, melt mixing at a temperature of 220° C. to 240° C., and then granulating, cooling and drying to obtain the polycarbonate alloy.

10. The polycarbonate alloy according to claim 2, wherein the ethylene copolymer is selected from at least one of an ethylene copolymer of acrylic acid, an ethylene-vinyl acetate copolymer, a styrene-butadiene-styrene copolymer, a styrene-ethylene-butadiene-styrene copolymer, and a styrene-ethylene-propylene-styrene copolymer; and the ethylene copolymer of acrylic acid is selected from at least one of an ethylene-methacrylic acid copolymer, an ethylene-ethyl acrylate copolymer, and an ethylene-butyl acrylate copolymer.

11. The polycarbonate alloy according to claim 10, wherein the ethylene copolymer is selected from the ethylene copolymer of acrylic acid.

12. The polycarbonate alloy according to claim 2, wherein the ethylene copolymer is selected from an ethylene copolymer containing a reactive active group, wherein the ethylene copolymer is selected from at least one of an ethylene copolymer of acrylic acid, an ethylene-vinyl acetate copolymer, a styrene-butadiene-styrene copolymer, a styrene-ethylene-butadiene-styrene copolymer, and a styrene-ethylene-propylene-styrene copolymer, the reactive active group is at least one of a maleic anhydride group and an epoxy group, and a grafting ratio of the reactive active group is 0.1% to 15%; and the ethylene copolymer of acrylic acid is selected from at least one of an ethylene-methacrylic acid copolymer, an ethylene-ethyl acrylate copolymer, and an ethylene-butyl acrylate copolymer.

13. The polycarbonate alloy according to claim 12, wherein the ethylene copolymer in the ethylene copolymer containing the reactive active group is selected from the ethylene copolymer of acrylic acid.

14. The polycarbonate alloy according to claim 2, wherein the polycarbonate is selected from an aromatic polycarbonate, an aliphatic polycarbonate, and an aromatic-aliphatic polycarbonate; and the polycarbonate has a weight average molecular weight of 18,000 to 28,000.

15. The polycarbonate alloy according to claim 2, wherein in parts by weight, further comprising 0 part to 10 parts of a processing aid and/or an additive.

16. A preparation method of the polycarbonate alloy according to claim 15, the method comprising the following steps: mixing the polycarbonate, the ethylene copolymer, the processing aid and/or the additive evenly according to a ratio in a high-speed mixer, so as to obtain a mixture; then adding the mixture into a twin-screw extruder, melt mixing at a temperature of 220° C. to 240° C., and then granulating, cooling and drying to obtain the polycarbonate alloy.

Description

DETAILED DESCRIPTION

[0017] The present invention will be further illustrated below by specific implementations, the following embodiments are preferred implementations of the invention, but the implementations of the present invention are not limited by the following embodiments.

[0018] Raw materials of Embodiments and Comparative Examples are commercially available, specifically:

[0019] EMA: ethylene-methacrylic acid copolymer;

[0020] EEA: ethylene-ethyl acrylate copolymer;

[0021] EMA-g-GMA: ethylene-methacrylic acid graft epoxy group (GMA is an epoxy group);

[0022] EVA: ethylene-vinyl acetate copolymer;

[0023] SEBS: styrene-ethylene-butadiene-styrene copolymer;

[0024] PP-g-GMA: polypropylene graft epoxy group;

[0025] polycarbonate A: an aromatic polycarbonate with a weight average molecular weight being 28,000;

[0026] polycarbonate B: an aliphatic polycarbonate with a weight average molecular weight being 18,000;

[0027] polycarbonate C: an aromatic polycarbonate with a weight average molecular weight being 8,000;

[0028] polycarbonate D: an aromatic polycarbonate with a weight average molecular weight being 30,000;

[0029] anti-aging agent: anti-oxidant: anti-ultraviolet aging agent=1:1.

[0030] A preparation method of a polycarbonate alloy in Embodiments and Comparative Examples: a polycarbonate and an ethylene copolymer were mixed evenly according to a ratio in a high-speed mixer; then added into a twin-screw extruder, melt mixed at a temperature of 220° C. to 240° C., and then granulated, cooled and dried to obtain the polycarbonate alloy.

[0031] Each test method:

[0032] (1) Internal stress test: a sample is soaked in 95% glacial acetic acid for 3 minutes. If there is no swelling and no cracking, it means that a stress cracking resistance is good.

[0033] (2) Processing molding cycle:

T=(0.013x+3.6)+(0.0085*m+0.5)+(0.6D.sup.2+0.3D)+D.sup.2/(α×π.sup.2)ln[8/π.sup.2×(tc−tm)/(tx−tm)]

[0034] x: machine clamping force (tons)

[0035] m: total product weight (grams)

[0036] D: maximum product wall thickness (mm)

[0037] a: thermal diffusivity of rubber material mm.sup.2 sec.sup.−1

[0038] tc: melting temperature (° C.)

[0039] tm: mold temperature (° C.)

[0040] tx: heat deflection temperature (° C.);

[0041] (3) Processing moldability (R angle): for an injection molded product, by measuring an R angle of product edge after molding, if the closer the R angle of the product edge after the molding is to a designed R angle, the better the processing moldability is; when the R angle of the product is designed as 10 mm, when a pattern satisfies a range: 10≤R angle≤13 mm, it is considered that the processing moldability is good, and when the R angle>13 mm, it is considered that the processing moldability is poor.

TABLE-US-00003 TABLE 1 Each ingredient and ratio (in parts by weight) and each performance test results of Embodiments and Comparative Examples Embodi- Embodi- Embodi- Embodi- ment ment ment ment 1 2 3 4 Polycarbonate A, parts 80  80  80  80  Polycarbonate B, parts — — — — Polycarbonate C, parts — — — — Polycarbonate D, parts — — — — Ethylene Species of copolymer reactive — — — — active group Content of — — — — reactive active group, % Ethylene EMA EMA EMA EMA copolymer Amount, 5 12  15  23  parts Anti-aging agent   0.5   0.5   0.5   0.5 Processing molding 32  30  28  28  cycle, s R angle, mm 12   10.5 10  10  Internal stress test no cracking Embodi- Embodi- Embodi- Embodi- ment ment ment ment 5 6 7 8 Polycarbonate A, parts 80  80  80  80  Polycarbonate B, parts — — — — Polycarbonate C, parts — — — — Polycarbonate D, parts — — — — Ethylene Species of copolymer reactive active group Content of — — — — reactive active group, % Ethylene EMA EEA EVA SEBS copolymer Amount, 30  15  15  15  parts Anti-aging agent   0.5   0.5   0.5   0.5 Processing molding 28  29  30  30  cycle, s R angle, mm 10  10  12  12  Internal stress test no cracking Embodi- Embodi- Embodi- Embodi- ment ment ment ment 9 10 11 12 Polycarbonate A, parts — — — 80  Polycarbonate B, parts 80  — — — Polycarbonate C, parts — 80  — — Polycarbonate D, parts — — 80  — Ethylene Species of — — — GMA copolymer reactive active group Content of — — —   0.1 reactive active group, % Ethylene EMA EMA EMA EMA copolymer Amount, 15  15  15  15  parts Anti-aging agent   0.5   0.5   0.5   0.5 Processing molding 29  35  36  33  cycle, s R angle, mm 10  13  13  12  Internal stress test no cracking Embodi- Embodi- Embodi- Embodi- ment ment ment ment 13 14 15 16 Polycarbonate A, parts 80  80  80  80  Polycarbonate B, parts — — — — Polycarbonate C, parts — — — — Polycarbonate D, parts — — — — Ethylene Species of GMA GMA GMA GMA copolymer reactive active group Content of 3 10  15  3 reactive active group, % Ethylene EMA EMA EMA EVA copolymer Amount, 15  15  15  15  parts Anti-aging agent   0.5   0.5   0.5   0.5 Processing molding 32  30  30  34  cycle, s R angle, mm 12   11.5  11.5 13  Internal stress test no cracking Comparative Comparative Example 1 Example 2 Polycarbonate A, parts 80  80  Polycarbonate B, parts — — Polycarbonate C, parts — — Polycarbonate D, parts — — Ethylene Species of — — copolymer reactive active group Content of — — reactive active group, % Ethylene — — copolymer Amount, — — parts PP-g-GMA — 15  Anti-aging agent   0.5   0.5 Processing molding 48  30  cycle, s R angle, mm 18  20  Internal stress test cracking swelling

[0042] It can be seen from Embodiments 1 to 5 that as an increase of the amount of the ethylene copolymer, processability is improved. In general, when the amount of the ethylene copolymer is 12 parts to 23 parts, an overall performance is relatively good and an industrial application value is relatively high.

[0043] It can be seen from Embodiments 3, 6 to 8 that the processability of the polycarbonate alloy added with the ethylene copolymer of acrylic acid is relatively good.

[0044] It can be seen from Embodiments 3, 9 to 11 that when the weight average molecular weight of the polycarbonate is within the range of 18,000 to 28,000, a product performance is better.

[0045] It can be seen from Comparative Example 1 that without adding the ethylene copolymer, its processability and stress cracking resistance are poor.

[0046] It can be seen from Comparative Example 2 that an addition of a traditional compatibilizer PP-g-GMA has a small improvement on the processability and the stress cracking resistance, and even the R angle after the molding is greater than that of Comparative Example 1.