Flame-retardant toughened pc / abs alloy and preparation method thereof

Abstract

The application discloses a flame-retardant toughened PC / ABS alloy, which comprises the following components in parts by weight: polycarbonate, ABS resin, composite toughening agent, flame retardant, and anti-dripping agent; the composite toughening agent is a compound of MBS toughening agent and a vinyl acrylate block type toughening agent, and the weight ratio range is (1-5):(5-1). The specific composite toughening agent can improve the mechanical properties and achieve more stable thin-wall flame-retardant properties.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, and in particular to a flame-retardant and toughened PC / ABS alloy 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] Existing technologies commonly use core-shell structured MBS toughening agents in PC / ABS alloys. While this toughening mechanism achieves toughness, it also reduces the oxygen index, leading to decreased flame retardancy. In particular, achieving V-0 flame retardancy is difficult for thin-walled PC / ABS alloys. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned technical defects and provide a PC / ABS alloy with thin walls (1.5mm, 1.0mm) and good V-0 flame retardancy and toughness, as well as a preparation method.

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

[0006] A flame-retardant and toughened PC / ABS alloy, comprising the following components by weight:

[0007] 60-80 parts polycarbonate;

[0008] 10-20 parts of ABS resin;

[0009] 1-8 parts of composite toughening agent;

[0010] 10-20 parts flame retardant;

[0011] Anti-dripping agent 0.1-2 parts;

[0012] The composite toughening agent is a combination of MBS toughening agent and vinyl acrylate block toughening agent, with a weight ratio ranging from (1-5):(5-1).

[0013] Preferably, the weight ratio of MBS toughening agent to vinyl acrylate block toughening agent is in the range of (3.5-2.5):(1.5-2.5).

[0014] The vinyl acrylate block toughening agent is selected from at least one of ethylene-methyl acrylate block toughening agents and ethylene-ethyl acrylate block toughening agents, wherein the acrylate unit content is 20%-40% by weight percentage of the vinyl acrylate block toughening agent, preferably 27%-31%.

[0015] In the ABS resin described above, the SAN weight content is 58%-82%, and the preferred SAN weight content is 68%-77%.

[0016] The flame retardant is selected from at least one of bisphenol A-bis(diphenyl phosphate), triphenyl phosphate, and resorcinol tetraphenyl diphosphate.

[0017] The anti-dripping agent is selected from polytetrafluoroethylene.

[0018] The polycarbonate has a melt index range of 5-25 g / 10 min, and the test conditions are 2.16 kg and 260 °C.

[0019] It also includes, by weight, 0-2 parts of at least one of antioxidants and lubricants.

[0020] The preparation method of flame-retardant and toughened PC / ABS alloy 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 flame-retardant and toughened PC / ABS alloy.

[0021] The present invention has the following beneficial effects:

[0022] This invention mainly utilizes a combination of MBS toughening agent and vinyl acrylate block toughening agent. Compared with MBS toughening agent alone or core-shell toughening agents, this combination not only improves toughness but also reduces the oxygen index, achieving stable thin-wall flame retardancy. Implementation

[0023] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention. These all fall within the scope of protection of the present invention.

[0024] The raw materials used in this invention are sourced from the following sources:

[0025] PC resin: melt index is 10, grade is 141, manufacturer is Saudi Aramco.

[0026] ABS Resin-1: SAN weight content is 80%, grade is 757, manufacturer is Chi Mei;

[0027] ABS Resin-2: SAN weight content is 60%, grade is 747, manufacturer is Chi Mei;

[0028] ABS Resin-3: SAN content is 70% by weight, grade is 12A1, manufacturer is Formosa Plastics.

[0029] ABS resin-4: SAN weight content is 75%, grade is 15A1, manufacturer is Formosa Plastics.

[0030] MBS toughening agent: brand name EM500, manufacturer is LG Chem;

[0031] Ethylene-methyl acrylate block toughening agent A: acrylate unit content is 24%, grade 24MA02T, manufacturer: Arkema;

[0032] Ethylene-methyl acrylate block toughening agent B: acrylate unit content is 29%, grade 29MA03T, manufacturer: Arkema;

[0033] Ethylene-methyl acrylate block toughening agent C: acrylate unit content is 35%, grade 35BA40, manufacturer: Arkema;

[0034] Polytetrafluoroethylene: grade SN3300, manufacturer is Entropy Energy;

[0035] Flame retardant: BDP;

[0036] Lubricant: Brand name PETS-AH, manufacturer is Faji;

[0037] Antioxidant: Brand name 1010, 186, manufacturer: BASF;

[0038] Preparation method of flame-retardant and toughened PC / ABS alloy in the examples and comparative examples: The components were mixed evenly according to the formula, and then extruded and granulated using a twin-screw extruder. The screw temperature was set to 180-260 degrees Celsius, and the rotation speed was 400-550 rpm to obtain the flame-retardant and toughened PC / ABS alloy. Test methods:

[0039] (1) 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).

[0040] (3) 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 measured.

[0041] Table 1: Content (parts by weight) and test results of each component in flame-retardant and toughened PC / ABS alloys in Examples 1-8

[0042] Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 PC resin 64 60 80 64 64 64 64 64 ABS Resin-1 15 20 10 15 15 15 15 15 MBS toughening agent 4 5 3 0.84 1 2.5 3.5 4.16 Ethylene-methyl acrylate block toughening agent A 1 3 5 4.16 4 2.5 1.5 0.84 Flame retardant 14 17 20 14 14 14 14 14 polytetrafluoroethylene 0.5 0.2 1 0.5 0.5 0.5 0.5 0.5 lubricant 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 antioxidants 1 1 1 1 1 1 1 1 Flame retardancy 1.5mm V-0 V-0 V-0 V-1 V-0 V-0 V-0 V-1 Flame retardancy 1.0mm V-1 V-0 V-0 V-1 V-1 V-0 V-0 V-1 <![CDATA[Impact strength kJ / m 2 > 70 50 52 66 66 66 65 70

[0043] As can be seen from Examples 1 / 4-8, the preferred MBS toughening agent / vinyl acrylate block toughening agent exhibits better flame retardancy when the weight ratio is within the range.

[0044] Table 2: Content (parts by weight) of each component and test results of flame-retardant and toughened PC / ABS alloys in Examples 9-13

[0045] Example 9 Example 10 Example 11 Example 12 Example 13 PC resin 64 64 64 64 64 ABS Resin-1 15 15 ABS Resin-2 15 ABS Resin-3 15 ABS Resin-4 15 MBS toughening agent 4 4 4 4 4 Ethylene-methyl acrylate block toughening agent A 1 1 1 Ethylene-methyl acrylate block toughening agent B 1 Ethylene-methyl acrylate block toughening agent C 1 Flame retardant 14 14 14 14 14 polytetrafluoroethylene 0.5 0.5 0.5 0.5 0.5 lubricant 0.5 0.5 0.5 0.5 0.5 antioxidants 1 1 1 1 1 Flame retardancy 1.5mm V-1 V-0 V-0 V-0 V-0 Flame retardancy 1.0mm V-1 V-0 V-0 V-0 V-1 <![CDATA[Impact strength kJ / m 2 > 70 72 71 72 73

[0046] As can be seen from Examples 1 / 9-11, the preferred ABS resin has a SAN weight content of 68%-77%, which not only has higher impact strength but also better flame retardancy.

[0047] As can be seen from Examples 1 / 12-13, the flame retardancy is better when the preferred acrylate unit content is 27%-31%.

[0048] Table 3: Content (parts by weight) and test results of each component in a comparative flame-retardant and toughened PC / ABS alloy

[0049] Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 PC resin 64 64 64 64 ABS Resin-1 15 15 15 15 MBS toughening agent 5 0.5 4.5 Ethylene-methyl acrylate block toughening agent A 5 4.5 0.5 Flame retardant 14 14 14 14 polytetrafluoroethylene 0.5 0.5 0.5 0.5 lubricant 0.5 0.5 0.5 0.5 antioxidants 1 1 1 1 Flame retardancy 1.5mm V-2 V-1 V-1 V-1 Flame retardancy 1.0mm NR NR V-2 V-2 <![CDATA[Impact strength kJ / m 2 > 50 50 66 70

[0050] As can be seen from the comparative examples, when the compound toughening agent is not within the scope of this invention, the flame retardancy is poor and the impact strength is low.

Claims

1. A flame-retardant and toughened PC / ABS alloy, characterized in that, By weight, it includes the following components: 60-80 parts polycarbonate; 10-20 parts of ABS resin; 1-8 parts of composite toughening agent; 10-20 parts flame retardant; Anti-dripping agent 0.1-2 parts; The composite toughening agent is a combination of MBS toughening agent and vinyl acrylate block toughening agent, with a weight ratio ranging from (1-5):(5-1). The vinyl acrylate block toughening agent is selected from at least one of ethylene-methyl acrylate block toughening agent and ethylene-ethyl acrylate block toughening agent, wherein the acrylate unit content is 20%-40% by weight percentage of the vinyl acrylate block toughening agent. The flame retardant is selected from at least one of bisphenol A-bis(diphenyl phosphate), triphenyl phosphate, and resorcinol tetraphenyl diphosphate.

2. The flame-retardant and toughened PC / ABS alloy according to claim 1, characterized in that, The weight ratio of MBS toughening agent to vinyl acrylate block toughening agent ranges from (3.5-2.5):(1.5-2.5).

3. The flame-retardant and toughened PC / ABS alloy according to claim 1, characterized in that, The acrylate unit content is 27%-31% by weight percentage of the vinyl acrylate block toughening agent.

4. The flame-retardant and toughened PC / ABS alloy according to claim 1, characterized in that, In the ABS resin, the SAN content by weight is 58%-82%.

5. The flame-retardant and toughened PC / ABS alloy according to claim 4, characterized in that, In the ABS resin, the SAN content by weight is 68%-77%.

6. The flame-retardant and toughened PC / ABS alloy according to claim 1, characterized in that, The anti-dripping agent is selected from polytetrafluoroethylene.

7. The flame-retardant and toughened PC / ABS alloy 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.

8. The flame-retardant and toughened PC / ABS alloy according to claim 1, characterized in that, It also includes, by weight, 0-2 parts of at least one of antioxidants and lubricants.

9. The method for preparing the flame-retardant and toughened PC / ABS alloy according to any one of claims 1-8, 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 a flame-retardant and toughened PC / ABS alloy.