A pc / abs composite material and a preparation method thereof

Abstract

The application discloses a PC / ABS composite material, which comprises the following components in parts by weight: 60-80 parts of polycarbonate; 10-20 parts of ABS resin; 3-7 parts of MBS toughening agent; 0.1-2 parts of composite filler; 10-20 parts of flame retardant; and 0.1-2 parts of anti-dripping agent; wherein the composite filler is titanium white / talc powder with a weight ratio of 1: (1-3). The application can improve the glossiness, enhance the impact strength and influence the flame retardancy to a certain extent by adding the composite filler with a specific content and average particle size.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, and in particular to a PC / ABS composite material and its preparation method. Background Technology

[0002] PC / ABS alloys possess the molding and processing properties of ABS resin, as well as the mechanical properties, temperature resistance, and UV resistance of PC resin, making them widely used in automotive interior parts, commercial machines, communication equipment, home appliances, and lighting equipment. Therefore, flame-retardant and toughened PC / ABS alloys represent a current trend in technological modification.

[0003] However, in the prior art, phosphorus-based flame retardants (bisphenol A-bis(diphenyl phosphate), triphenyl phosphate, resorcinol tetraphenyl diphosphate, etc.) are prone to precipitation, which can easily lead to a decrease in surface gloss. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned defects and provide a PC / ABS composite material with high gloss, high impact strength and good flame retardant properties.

[0005] This invention is achieved through the following technical solution:

[0006] A PC / ABS composite material, comprising the following components by weight:

[0007] 60-80 parts polycarbonate;

[0008] 10-20 parts of ABS resin;

[0009] 3-7 parts of MBS toughening agent;

[0010] 0.1-2 parts of composite filler;

[0011] 10-20 parts flame retardant;

[0012] Anti-dripping agent 0.1-2 parts;

[0013] The composite filler is titanium dioxide / talc powder with a weight ratio of 1:(1-3).

[0014] The average particle size range of the composite filler is 20-35 μm.

[0015] Generally, in white systems, a higher titanium dioxide content results in higher surface whiteness and gloss. However, in the technical solution of this invention, a higher titanium dioxide content does not necessarily lead to higher surface gloss. The main reason is that with a low composite filler content, this ratio has a more significant impact on the change in surface gloss caused by flame retardant precipitation. Preferably, the composite filler has a titanium dioxide / talc weight ratio of 1:(1.5-2.5). Under the preferred composite filler ratio, not only can gloss and impact strength be further improved, but flame retardancy can also be affected to a certain extent.

[0016] Preferably, the average particle size range of the composite filler is 25-30 μm.

[0017] In the ABS resin, the SAN content is 58%-82% by weight, preferably 69%-76% by weight. ABS resins with a higher SAN content result in a composite material with a higher surface gloss.

[0018] The flame retardant is selected from at least one of bisphenol A-bis(diphenyl phosphate), triphenyl phosphate, and resorcinol tetraphenyl diphosphate.

[0019] The anti-dripping agent is selected from polytetrafluoroethylene.

[0020] The polycarbonate has a melt index range of 5-25 g / 10 min, and the test conditions are 2.16 kg and 260 °C.

[0021] It also includes, by weight, 0-2 parts of at least one of antioxidants and lubricants.

[0022] The preparation method of the PC / ABS composite material of the present invention involves mixing the components evenly according to the formula, and then extruding and granulating them through a twin-screw extruder. The screw temperature range is 200-280 degrees Celsius, and the rotation speed range is 200-800 rpm, to obtain the PC / ABS composite material.

[0023] The present invention has the following beneficial effects:

[0024] This invention, through composite fillers with specific content / particle size, can significantly improve the reduction in surface gloss caused by flame retardant precipitation and further enhance impact strength.

[0025] The raw materials used in this invention are sourced from the following sources:

[0026] PC resin: melt index is 10, grade is 141, manufacturer is Saudi Aramco.

[0027] ABS Resin-1: SAN weight content is 80%, grade is 757, manufacturer is Chi Mei;

[0028] ABS Resin-2: SAN weight content is 60%, grade is 747, manufacturer is Chi Mei;

[0029] ABS Resin-3: SAN content is 70% by weight, grade is 12A1, manufacturer is Formosa Plastics.

[0030] ABS resin-4: SAN weight content is 75%, grade is 15A1, manufacturer is Formosa Plastics.

[0031] MBS toughening agent: brand name EM500, manufacturer is LG Chem;

[0032] Polytetrafluoroethylene: grade SN3300, manufacturer is Entropy Energy;

[0033] Flame retardant: BDP;

[0034] Talc powder was purchased from Quanzhou Xufeng Powder Raw Material Co., Ltd., and then screened and tested with a particle size analyzer to obtain raw materials with different average particle sizes.

[0035] Talc A: Average particle size 20.3 micrometers;

[0036] Talc B: Average particle size 25.2 micrometers;

[0037] Talc C: Average particle size 29.7 micrometers;

[0038] Talc D: Average particle size 35 micrometers;

[0039] Talc E: Average particle size 14.9 micrometers;

[0040] Talc powder F: Average particle size 50.4 micrometers;

[0041] Titanium dioxide was purchased from Shanghai Tianguang Chemical Plant, and then screened and tested with a particle size analyzer to obtain raw materials with different average particle sizes.

[0042] Titanium dioxide A: Average particle size 20.1 micrometers;

[0043] Titanium dioxide B: Average particle size 25.8 micrometers;

[0044] Titanium dioxide C: Average particle size 28.9 micrometers;

[0045] Titanium dioxide D: Average particle size 34.6 micrometers;

[0046] Titanium dioxide E: Average particle size 13.7 micrometers;

[0047] Titanium dioxide F: Average particle size 48 micrometers;

[0048] Lubricant: Brand name PETS-AH, manufacturer is Faji;

[0049] Antioxidant: Brand name 1010, 186, manufacturer: BASF;

[0050] Preparation method of PC / ABS composite material in the examples and comparative examples: According to the formula, the components are mixed evenly and extruded and granulated by a twin-screw extruder. The screw temperature is set to 180-260 degrees and the rotation speed is 400-550 rpm to obtain PC / ABS composite material.

[0051] Test methods:

[0052] (1) Impact strength: The impact strength measured in this invention is the impact strength of its cantilever beam. The machine is operated in accordance with the GB / T1843.1-2008 standard. A sample is placed in the position specified by the laboratory impact analyzer, and a pendulum is allowed to fall freely by hand. When the sample is damaged by impact and external force, the impact energy generated and absorbed per unit cross-sectional area is recorded, that is, the impact strength of the test material is tested.

[0053] (2) Surface gloss: The surface gloss at 60° was measured and recorded using a BYK AG-4561 miniature gloss meter.

[0054] (3) Flame retardancy: This invention adopts GB / T 2408-2008 Plastics Combustion Performance Test, referring to the vertical method therein, the sample is placed vertically and burned with a flame of constant size, and its flame retardancy level is determined by the sample's combustion behavior (whether it self-extinguishes and drips, etc.) and its ability to ignite flammable materials. According to its flame retardancy level, it can be specifically divided into V-0, V-1 and V-2 levels and NR (not passed).

[0055] Table 1: Content (parts by weight) of each component and test results of PC / ABS composite materials in Examples 1-6

[0056] Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 PC resin 80 70 70 70 70 70 ABS Resin-1 20 15 15 15 15 15 MBS toughening agent 7 5 5 5 5 5 Talc A 0.9 0.5 0.4 0.33 0.28 0.25 Titanium Dioxide A 0.9 0.5 0.6 0.67 0.62 0.75 Flame retardant BDP 20 14 14 14 14 14 polytetrafluoroethylene 2 1 1 1 1 1 lubricant 0.4 0.4 0.4 0.4 0.4 0.4 antioxidants 0.8 0.8 0.8 0.8 0.8 0.8 <![CDATA[Impact strength kJ / m 2 > 55 67 68 66 63 60 Flame retardancy 1.5mm V0 V0 V0 V0 V0 V0 Flame retardancy 1.0mm V0 V0 V0 V0 V0 V1 60° gloss 88 88 92 93 90 86

[0057] As shown in Examples 2-6 and Comparative Example 3 / 4, the blending ratio of talc to titanium dioxide significantly affects surface gloss and impact strength, and also influences flame retardancy to some extent, especially for thin-walled structures. Under the preferred talc / titanium dioxide blending ratio, the flame retardancy is stable (V0), and the overall gloss and impact strength are better.

[0058] Table 2: Content (parts by weight) of each component and test results of PC / ABS composite materials in Examples 7-10

[0059] Example 7 Example 8 Example 9 Example 10 PC resin 70 70 70 70 ABS Resin-1 15 15 15 15 MBS toughening agent 5 5 5 5 Talc B 0.5 0.5 Talc C 0.5 Talc D 0.5 Titanium Dioxide B 0.5 Titanium Dioxide C 0.5 0.5 Titanium Dioxide D 0.5 Flame retardant BDP 14 14 14 14 polytetrafluoroethylene 1 1 1 1 lubricant 0.4 0.4 0.4 0.4 antioxidants 0.8 0.8 0.8 0.8 Flame retardancy 1.5mm V0 V0 V0 V0 Flame retardancy 1.0mm V0 V0 V0 V0 <![CDATA[Impact strength kJ / m 2 > 68 68 68 68 60° gloss 93 93 94 93

[0060] As can be seen from Examples 2 / 7-10, the surface gloss is significantly higher when the average particle size of the preferred compound filler is larger.

[0061] Table 3: Content (parts by weight) of each component and test results of comparative PC / ABS composite materials

[0062] Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 PC resin 70 70 70 70 ABS Resin-1 15 15 15 15 MBS toughening agent 5 5 5 5 Talc A 0.66 0.2 Talc E 0.5 Talc F 0.5 Titanium Dioxide A 0.34 0.8 Talc E 0.5 Talc F 0.5 Flame retardant BDP 14 14 14 14 polytetrafluoroethylene 1 1 1 1 lubricant 0.4 0.4 0.4 0.4 antioxidants 0.8 0.8 0.8 0.8 Flame retardancy 1.5mm V0 V0 V0 V0 Flame retardancy 1.0mm V0 V0 V0 V1 <![CDATA[Impact strength kJ / m 2 > 64 63 64 60 60° gloss 82 84 85 85

[0063] As shown in Comparative Example 1 / 2, the average particle size of the compound filler has a significant effect on the precipitation of flame retardants.

[0064] As can be seen from Comparative Example 3 / 4, when the ratio of talc to titanium dioxide is outside the range of this invention, the impact strength and gloss are significantly lower.

Claims

1. A PC / ABS composite material, characterized in that, By weight, it includes the following components: 60-80 parts polycarbonate; 10-20 parts of ABS resin; 3-7 parts of MBS toughening agent; 0.1-2 parts of composite filler; 10-20 parts flame retardant; Anti-dripping agent 0.1-2 parts; The composite filler is titanium dioxide / talc powder in a weight ratio of 1:1; The average particle size range of the composite filler is 20-35 μm; The flame retardant is selected from at least one of bisphenol A-bis(diphenyl phosphate), triphenyl phosphate, and resorcinol tetraphenyl diphosphate.

2. The PC / ABS composite material according to claim 1, characterized in that, The average particle size range of the composite filler is 25-30 μm.

3. The PC / ABS composite material according to claim 1, characterized in that, In the ABS resin, the SAN content by weight is 58%-82%.

4. The PC / ABS composite material according to claim 3, characterized in that, In the ABS resin, the SAN content by weight is 69%-76%.

5. The PC / ABS composite material according to claim 1, characterized in that, The anti-dripping agent is selected from polytetrafluoroethylene.

6. The PC / ABS composite material according to claim 1, characterized in that, The polycarbonate has a melt index range of 5-25 g / 10 min, and the test conditions are 2.16 kg and 260 °C.

7. The PC / ABS composite material according to claim 1, characterized in that, It also includes, by weight, 0-2 parts of at least one of antioxidants and lubricants.

8. A method for preparing the PC / ABS composite material according to any one of claims 1-7, characterized in that, According to the formula, the components are mixed evenly and then extruded and granulated through a twin-screw extruder. The screw temperature range is 200-280 degrees Celsius and the rotation speed range is 200-800 rpm to obtain PC / ABS composite material.