Regenerated PC / ABS material and preparation method thereof

Abstract

The invention discloses a regenerated PC / ABS (polycarbonate / acrylonitrile-butadiene-styrene) material and a preparation method thereof, and the regenerated PC / ABS material comprises the following components in parts by weight: 60-79 parts of regenerated PC; 18 to 30 parts of regenerated ABS; 1-4 parts of a toughening agent; 0.5-2 parts of an impact modifier; 0.5 to 2 parts of a compatibilizer; and 1-4 parts of a multifunctional modifier. According to the invention, the waste PC / ABS material is utilized, and the recycling of resources is realized through the processes of recycling, cleaning, crushing, granulating and the like. The method not only reduces environmental pollution, but also reduces dependence on native materials, and promotes sustainable development. The performance of the regenerated PC / ABS material is optimized through accurate proportioning and addition of various modifiers, such as a flexibilizer, an impact modifier, a compatibilizer and a multifunctional modifier.

Description

Technical Field

[0001] The present invention relates to the field of polymer composite materials, and in particular to a recycled PC / ABS material and a preparation method thereof. Background Art

[0002] Polycarbonate (PC) is a thermoplastic engineering plastic synthesized primarily by the condensation reaction of bisphenol A with phosgene or diphenyl carbonate. PC has many desirable properties such as optical transparency, excellent mechanical properties and easy processing, making it an ideal polymer for construction, automotive and electronics applications. However, discarded electronics are considered to be the fastest growing waste stream and a global problem in recent times due to the short lifespan of these products and the need to upgrade them according to the latest technology.

[0003] PC is widely used in automobiles, home appliances, and electronic appliances due to its excellent mechanical properties, electrical insulation, and dimensional stability. However, repeated injection molding and multiple extrusions will cause the polymer chain to decompose, resulting in lower molecular weight. The reduction in molecular weight will lead to the loss of many properties such as mechanical and rheological properties, limiting the widespread application of recycled materials in engineering.

[0004] Polycarbonate / Acrylonitrile-Butadiene-Styrene (PC / ABS) blend is a commercial polymer blend that combines the advantages of PC and ABS. In PC / ABS blends, PC has good toughness and heat distortion temperature characteristics, while ABS improves the processability of the blend and reduces costs. Therefore, the latter is widely used in electrical and electronic products such as the automotive industry, mobile phone housings, office supplies, and home appliances.

[0005] With the improvement of people's living standards and the development of science and technology, the consumption of such products has increased significantly, and the frequency of upgrading and replacement is also accelerating. Unfortunately, polymers will undoubtedly degrade and age due to photo-oxidation or thermal oxidation during use. The traditional methods of treating waste plastics such as incineration and landfill are extremely detrimental to the environment. Not only will they cause secondary pollution to humans and nature, but they are also very wasteful and uneconomical from the perspective of sustainable development. In order to recycle these waste plastics more effectively, researchers have conducted a lot of research on the aging of these materials under experimental conditions, and explored the degradation mechanism and modification of R-PC / ABS waste through various methods. Under the combined effects of heat, oxygen and light radiation, the isopropylidene group in PC is extremely unstable, resulting in molecular chain breakage and a decrease in molecular weight. Summary of the invention

[0006] In view of the recycling problem of current PC / ABS materials, the present invention provides a recycled PC / ABS material and a preparation method thereof, which has excellent performance, can be recycled, and is beneficial to environmental protection.

[0007] To achieve the above object, the embodiments of the present invention adopt the following technical solutions:

[0008] A recycled PC / ABS material, comprising the following components by weight:

[0009] Recycled PC 60-79 parts;

[0010] Recycled ABS 18-30 parts;

[0011] 1-4 parts of toughening agent;

[0012] Impact modifier 0.5-2 parts;

[0013] 0.5-2 parts of compatibilizer;

[0014] 1-4 parts of multifunctional modifier;

[0015] The recycled PC, recycled ABS, toughening agent, impact modifier, compatibilizer and multifunctional modifier account for 100 parts by weight in total.

[0016] Preferably, the recycled PC and recycled ABS come from sorted recycled plastic products.

[0017] Preferably, the toughening agent is styrene-butadiene-methyl methacrylate (MBS) and / or styrene-methylphenylsiloxane-methyl methacrylate (MSIS).

[0018] Preferably, the compatibilizer is diglycidyl ether of bisphenol A epoxy resin (DGEBA).

[0019] Preferably, the multifunctional modifier is styrene-butadiene-glycidyl methacrylate (SBG). The carboxyl and hydroxyl groups of PC / ABS react with the epoxy groups of SBG to form ester groups and ether bonds. The introduction of SBG increases the molecular weight and entanglement.

[0020] Preferably, the impact modifier is ethylene-acrylate-glycidyl methacrylate (AX8900).

[0021] On the other hand, a method for preparing any of the above-mentioned recycled PC / ABS materials comprises the following steps:

[0022] Clean and dry recycled PC and recycled ABS to obtain clean raw materials;

[0023] The clean raw materials, toughening agent, impact modifier, compatibilizer and multifunctional modifier are mixed, melt-extruded and then cooled and pelletized to obtain recycled PC / ABS material.

[0024] Preferably, the temperature for drying the regenerated PC and the regenerated ABS is 110-130° C., and the drying time is 5-6 hours.

[0025] Preferably, the temperature for mixing the clean raw material, toughening agent, impact modifier, compatibilizer and multifunctional modifier is 70-90° C., and the mixing time is 10-15 min.

[0026] Preferably, the melt extrusion adopts a twin-screw extruder, the rotation speed of the melt extrusion is 450-650 rpm / min, and the temperature of the melt extrusion is 190-220°C.

[0027] Advantages of the present invention: By utilizing discarded PC / ABS materials, resources are reused through recycling, cleaning, crushing and granulation processes. This not only reduces environmental pollution, but also reduces dependence on virgin materials and promotes sustainable development. The invention optimizes the performance of recycled PC / ABS materials through precise proportions and the addition of multiple modifiers, such as toughening agents, impact modifiers, compatibilizers and multifunctional modifiers. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] The raw materials used in the examples and comparative examples of the present invention are all commercially available, but are not limited to these materials:

[0030] Toughener 1: styrene-butadiene-methyl methacrylate (MBS), LG Chemical Co., Ltd., South Korea;

[0031] Toughener 2: styrene-methylphenylsiloxane-methyl methacrylate (MSIS), produced by Ningbo Nengzhiguang New Materials Technology Co., Ltd.;

[0032] Compatibilizer: diglycidyl ether of bisphenol A epoxy resin (DGEBA), purchased from Wuxi Bluestar Chemical New Materials Co., Ltd., China;

[0033] Multifunctional modifier: styrene-butadiene-glycidyl methacrylate (SBG), produced by Arkema (China) Investment Co., Ltd. Shanghai Branch;

[0034] Impact modifier: ethylene-acrylate-glycidyl methacrylate (AX8900), Makwell Plasticizers Ltd., Mumbai;

[0035] Twin-screw extruder: SHJ-36, Nanjing Henggao Extrusion Equipment Co., Ltd., Nanjing, China;

[0036] Injection molding machine: JH600, Haitian Plastic Machinery Group Co., Ltd.

[0037] Mixer: Haake Rheocord 9000, M / s Haake, Germany.

[0038] Preparation methods of embodiments and comparative examples:

[0039] The recycled PC and recycled ABS are cleaned and dried to obtain clean raw materials; the drying temperature is 110-130°C and the drying time is 5-6 hours. Drying is performed until the moisture content is less than 0.01%.

[0040] The clean raw materials, toughening agent, impact modifier, compatibilizer and multifunctional modifier are mixed by a mixer, melt extruded, cooled and pelletized to obtain recycled PC / ABS material. The temperature for mixing the clean raw materials, toughening agent, impact modifier, compatibilizer and multifunctional modifier is 70-90°C, and the mixing time is 10-15min. The melt extrusion adopts a twin-screw extruder, the speed of the melt extrusion is 450-650rpm / min, and the temperature of the melt extrusion is 190-220°C.

[0041] Among them, the processed recycled PC / ABS material can be further characterized by an injection molding machine at a temperature range of 220-230°C.

[0042] Related performance test methods:

[0043] Notched impact: Test method ISO 179-1 / 1eA

[0044] Examples 1-5 are recycled PC-ABS materials of the present invention. The raw materials and weight proportions of the recycled PC-ABS materials of Examples 1-5 are shown in Table 1.

[0045] Table 1:

[0046]

[0047] Comparative Examples 1-5 are comparative PC-ABS materials of the present invention, and their raw materials and weight parts are shown in Table 2.

[0048] Table 2:

[0049]

[0050] The impact performance test results of the recycled PC-ABS materials of Examples 1-5 and the PC-ABS materials of Comparative Examples 1-5 are shown in Table 3.

[0051] Table 3:

[0052] Impact strength(MPa) Bending strength(MPa) Tensile strength(MPa) Example 1 52 73 49 Example 2 53 74 49 Example 3 56 77 50 Example 4 63 81 54 Example 5 66 87 59 Example 6 68 90 60 Comparative Example 1 54 75 49 Comparative Example 2 69 89 59 Comparative Example 3 66 83 53 Comparative Example 4 56 76 50 Comparative Example 5 59 79 51 Comparative Example 6 40 71 46

[0053] Based on the above data, we can see that:

[0054] Comparison between Comparative Example 6 and Example 1 shows that under the same dosage of the compatibilizer, the addition of the multifunctional modifier has better tensile, bending and impact properties than the addition of the toughening agent.

[0055] Comparison between Example 1, Example 4 and Comparative Example 6 shows that adding more impact modifier has a significant effect on improving impact performance;

[0056] Comparing Example 5 with Example 6, and Comparative Example 2 with Comparative Example 3, the ratio of impact modifier to multifunctional modifier of 1:3 to 2:2 has better impact performance;

[0057] By comparing Examples 1-6 with Comparative Examples 1-5, it can be clearly seen that the stretching, bending and punching performance of the modified recycled PC / ABS can almost reach the level of the original PC / ABS. Compared with Comparative Example 6, the product of this solution has a greater performance improvement than the recycled PC / ABS material that has not been treated by this application.

[0058] Advantages of the present invention: By utilizing discarded PC / ABS materials, resources are reused through recycling, cleaning, crushing and granulation processes. This not only reduces environmental pollution, but also reduces dependence on virgin materials and promotes sustainable development. The invention optimizes the performance of recycled PC / ABS materials through precise proportions and the addition of multiple modifiers, such as toughening agents, impact modifiers, compatibilizers and multifunctional modifiers.

[0059] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the art within the technical scope disclosed in the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A recycled PC / ABS material, characterized in that: By weight, it includes the following components: Recycled PC 60-79 parts; Recycled ABS 18-30 parts; 1-4 parts of toughening agent; Impact modifier 0.5-2 parts; Compatibilizer 0.5-2 parts; 1-4 parts of multifunctional modifier; The recycled PC, recycled ABS, toughening agent, impact modifier, compatibilizer and multifunctional modifier account for 100 parts by weight in total.

2. The recycled PC / ABS material according to claim 1, characterized in that: The recycled PC and recycled ABS come from sorted and recycled plastic products.

3. The recycled PC / ABS material according to claim 1, characterized in that: The toughening agent is styrene-butadiene-methyl methacrylate and / or styrene-methylphenylsiloxane-methyl methacrylate.

4. The recycled PC / ABS material according to claim 1, characterized in that: The compatibilizer is diglycidyl ether of bisphenol A epoxy resin.

5. The recycled PC / ABS material according to claim 1, characterized in that: The multifunctional modifier is styrene-butadiene-glycidyl methacrylate.

6. The recycled PC / ABS material according to claim 1, characterized in that: The impact modifier is ethylene-acrylate-glycidyl methacrylate.

7. A method for preparing the recycled PC / ABS material according to any one of claims 1 to 6, the method comprising the following steps: Clean and dry recycled PC and recycled ABS to obtain clean raw materials; The clean raw materials, toughening agent, impact modifier, compatibilizer and multifunctional modifier are mixed, melt-extruded and then cooled and pelletized to obtain recycled PC / ABS material.

8. The preparation method according to claim 7, characterized in that: The temperature for drying the regenerated PC and the regenerated ABS is 110-130° C., and the drying time is 5-6 hours.

9. The preparation method according to claim 7, characterized in that: The temperature of mixing the clean raw material, toughening agent, impact modifier, compatibilizer and multifunctional modifier is 70-90° C., and the mixing time is 10-15 minutes.

10. The preparation method according to claim 7, characterized in that: The melt extrusion adopts a twin-screw extruder, the rotation speed of the melt extrusion is 450-650rpm / min, and the temperature of the melt extrusion is 190-220°C.

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