Hydrolysis-resistant and high-weather-resistant PC / ABS (polycarbonate / acrylonitrile-butadiene-styrene) material and preparation method thereof

Abstract

The invention discloses a hydrolysis-resistant and high-weather-resistant PC / ABS (polycarbonate / acrylonitrile-butadiene-styrene) material which is prepared from the following raw materials in percentage by mass: 60-80% of PC; 8%-25% of ABS (acrylonitrile butadiene styrene); 10%-15% of SAN (styrene-acrylonitrile); 2%-5% of a hydrolysis-resistant auxiliary agent; and 1%-2% of a processing aid. The preparation method has the advantages that 1, PC and ABS raw materials with higher purity and more stable quality are selected, so that the influence of impurities and residues is reduced; 2, MBS is used as a compatilizer and a hydrolysis-resistant auxiliary agent, and the notch impact retention rate after 85 DEG C * 1000h * 85% humidity can reach 85% or above; and 3, the special weather-proof auxiliary agent is matched, so that the requirements of PV1303 (5 cycles) and SAE 2412 (600kj / m < 2 >) can be met.

Description

Technical Field

[0001] This invention belongs to the field of modified polyester materials, specifically relating to a hydrolysis-resistant and highly weather-resistant PC / ABS material and its preparation method. Background Technology

[0002] China's PC / ABS alloy industry started in the late 1960s and, after decades of development, has formed a relatively complete industrial chain and market scale. In recent years, with the rapid development of domestic industries such as automobiles and electronics, the demand for high-performance engineering plastics has been increasing, driving the research and application of hydrolysis-resistant, weather-resistant, and high-gloss PC / ABS. Currently, some domestic companies are capable of producing this high-performance material and have gained a certain market share. However, compared with international advanced levels, domestic companies still lag behind in terms of technology and product quality. Foreign countries started earlier in the research and production of hydrolysis-resistant, weather-resistant, and high-gloss PC / ABS, and their technology is relatively mature. Some internationally renowned companies, such as Teijin of Japan, Covestro of Germany, and LG Chem of South Korea, have secured leading positions in the global market thanks to their advanced technology and high-quality products.

[0003] Hydrolysis resistance is a crucial indicator of the performance of PC / ABS materials. Hydrolysis refers to the process by which water molecules accelerate the breaking of chemical bonds within the polymer after it absorbs moisture, leading to plastic degradation. This process causes the polymer's molecular chains to break, its molecular weight to decrease, and consequently, its performance to deteriorate or even fail. At room temperature, the hydrolysis rate is relatively slow, but under high temperature and humidity conditions, the material can fail rapidly. By adding specific modifiers or employing specialized production processes, the hydrolysis resistance of PC / ABS materials can be significantly improved.

[0004] With its dual advantages of hydrolysis resistance and weather resistance, it can replace traditional materials in fields with stringent environmental tolerance requirements, such as automobiles (e.g., door panels, dashboards), electronic appliances (e.g., charging pile housings, outdoor sensors), medical devices (e.g., disinfection equipment components), and industrial machinery.

[0005] Therefore, developing a PC / ABS alloy material with excellent properties such as hydrolysis resistance and high weather resistance has a wide range of applications and prospects. Summary of the Invention

[0006] The purpose of this invention is to provide a hydrolysis-resistant and highly weather-resistant PC / ABS material and its preparation method, which increases the material's hydrolysis resistance and weather resistance while maintaining its mechanical properties, thus broadening the material's application range.

[0007] The objective of this invention is achieved through the following technical solution:

[0008] A hydrolysis-resistant and highly weather-resistant PC / ABS material, made from the following raw materials in the following percentage by weight:

[0009]

[0010] Among the above-mentioned hydrolysis-resistant and highly weather-resistant PC / ABS materials,

[0011] The PC mentioned is a material with a molecular weight between 18,000 and 25,000 and a melt index between 8 and 25 g / 10 min.

[0012] The ABS resin is a low-gloss bulk ABS with a melt index of 5-30 g / 10 min, an impact strength of 15-25 kJ / m², and a low gloss.

[0013] The SAN is a styrene-acrylonitrile copolymer with a weight-average relative molecular mass of 400,000 to 500,000 g / mol.

[0014] The hydrolysis-resistant additive is one or more of acrylic epoxy compounds, EDTA (ethylenediaminetetraacetic acid), and core-shell structured acrylate-butadiene-styrene copolymers.

[0015] The weather-resistant additive is one or more of UV-360, UV-234, 5577, UV=P, UV-770, and UV-1230.

[0016] The preparation method of the above-mentioned hydrolysis-resistant and weather-resistant PC / ABS material is as follows: (1) PC resin, ABS resin, hydrolysis-resistant additives and processing aids are mixed evenly and then fed into a high-shear twin-screw extruder for melt extrusion granulation; (2) The processing temperature of the twin-screw extruder from the feed section to the die head is as follows: the temperature of zone 1 to 4 is 240 to 260°C, the temperature of zone 5 to 9 is 220 to 240°C, and the die head temperature is 240 to 260°C.

[0017] The advantages of this invention are:

[0018] 1. Select PC and ABS raw materials with higher purity and more stable quality to reduce the impact of impurities and residues;

[0019] 2: MBS-based materials, as compatibilizers and hydrolysis-resistant additives, can achieve a notched impact retention rate of over 85% after 85℃*1000h*85% humidity.

[0020] 3: With specific weather-resistant additives, it can meet the requirements of PV1303 (5 cycles) and SAE 2412 (600kj / ㎡). Detailed Implementation

[0021] Table 1. Parts by weight of raw materials in Examples 1-6 and Comparative Example 1

[0022]

[0023]

[0024] The present invention discloses a method for preparing a hydrolysis-resistant and highly weather-resistant PC / ABS material, characterized in that PC resin, ABS resin, hydrolysis-resistant additives, and processing aids are mixed uniformly, and then fed into a high-shear twin-screw extruder for melt extrusion granulation. The processing temperatures of the twin-screw extruder from the feed section to the die head are as follows: zones 1-4 are 240-260℃, zones 5-9 are 220-240℃, and the die head temperature is 240-260℃.

[0025] The weight proportions of each raw material are shown in Table 1. The product was prepared into test specimens using an injection molding machine, and the test results are shown in Table 2.

[0026] Tensile strength was tested according to the method specified in ISO 527, with a test speed of 50 mm / min; flexural strength was tested according to the method specified in ISO 178, with a test speed of 2 mm / min; notched impact strength was tested according to the method specified in ISO 179-1 eA for simply supported beams; and heat distortion temperature was tested according to the method specified in ISO 75.

[0027] The hydrolysis resistance test conditions are: 85℃ * 1000h * 85% humidity

[0028] Weathering test conditions: PV1303 and SAE J2412

[0029] The test data is shown in the table below:

[0030] Table 2 Performance test results of Examples 1-6 and Comparative Examples 1-2

[0031]

[0032]

Claims

1. A hydrolysis resistant, high weatherable PC / ABS material characterized in that, The raw materials are made of the following quality percentage:

2. The hydrolysis resistant, high weatherable PC / ABS material according to claim 1, characterized in that, The PC is a material with molecular weight between 18000-25000 and melt index between 8-25g / 10min.

3. The hydrolysis resistant, high weatherable PC / ABS material according to claim 1, characterized in that, The ABS resin is a low gloss bulk ABS with melt index between 5-30g / 10min and impact strength between 15-25kj / m2.

4. The hydrolysis resistant, high weatherable PC / ABS material according to claim 1, characterized in that, The SAN is a styrene-propylene copolymer with weight average relative molecular mass between 400,000-500,000g / mol.

5. The hydrolysis resistant, high weatherable PC / ABS material according to claim 1, characterized in that, The hydrolysis resistant auxiliary is one or more of the following: acrylic acid epoxide, EDTA (ethylenediamine tetraacetic acid), core-shell structure acrylate-butadiene-styrene copolymer.

6. The hydrolysis resistant, high weatherable PC / ABS material according to claim 1, characterized in that, The weather resistant auxiliary is one or more of the following: UV-360, UV-234, 5577, UV=P.UV-770, UV-1230.

7. The process for the preparation of a hydrolysis resistant, high weatherable PC / ABS material according to any one of claims 1 to 6, characterized in that, The steps are as follows: (1) mix the PC resin, ABS resin, hydrolysis resistant auxiliary and processing auxiliary uniformly, then send into high shear double screw extruder, melt extrude and granulate; (2) the processing temperature of the double screw extruder is as follows: the temperature of 1-4 zones is 240-260℃, the temperature of 5-9 zones is 220-240℃, and the die temperature is 240-260℃.

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