Mineral-reinforced high-performance PC / ABS alloy having excellent appearance, and preparation method therefor

Abstract

Disclosed are a mineral-reinforced high-performance PC / ABS alloy having an excellent appearance, and a preparation method therefor. The mineral-reinforced high-performance PC / ABS alloy comprises: 40-70 parts of a PC resin, 5-25 parts of an ABS resin, 15-40 parts of an ABS masterbatch, 2-5 parts of a toughening agent, 0.5-5 parts of a compatibilizer, 0.1-2 parts of an antioxidant, and 0.1-2 parts of a lubricant. During preparation, the PC resin, the ABS resin, the ABS masterbatch, the compatibilizer, the toughening agent, the antioxidant, and the lubricant are mixed. The obtained mixture is blended by a twin-screw extruder and is subjected to melt extrusion and granulation to obtain the product. In the present invention, an anti-dripping agent is used in the ABS mineral masterbatch to form a fiber network therein, the generation of precipitation of minerals due to same flowing to the surface in a PC / ABS injection molding process is weakened, and the degradation reaction of the minerals and the PC is also reduced, thereby obtaining a mineral-reinforced high-performance PC / ABS alloy having an excellent appearance.

Description

Good appearance and high performance mineral reinforced PC / ABS alloy and preparation method thereof Technical Field

[0001] The present invention relates to the field of polymer materials, and in particular to a mineral-reinforced PC / ABS alloy with good appearance and high performance and a preparation method thereof. Background Art

[0002] PC / ABS alloys possess excellent mechanical and thermal properties and are currently widely used in automobiles, home appliances, digital products, and other fields. In recent years, the increasingly intelligent performance of automotive interiors and exteriors has led to a growing demand for PC / ABS alloys with excellent appearance, high performance, and dimensional stability. The linear expansion coefficient is a reference indicator of a material's dimensional stability. Mineral and glass fiber fillings can achieve low linear expansion coefficients, but the anisotropic nature of glass fiber filling can easily lead to warping and floating fiber problems. Isotropic mineral-reinforced PC / ABS can achieve both excellent dimensional stability and appearance.

[0003] Taking automobiles as an example, the current demand for larger display screens and larger tail wings has led to increasingly stringent requirements for low linear expansion coefficients. PC / ABS alloys require a higher proportion of mineral fillers to meet size requirements. However, due to the poor compatibility of inorganic minerals with PC and ABS, agglomeration will occur when the content is high, resulting in undesirable problems such as mineral precipitation on the material appearance. In addition, the alkali metal ions Mg in inorganic minerals are 2+ 、Fe 3+ , Ca 2+ The existing technology only improves the compatibility between minerals and substrates by masterbatch or modification of minerals to improve the performance of PC / ABS alloys, but the effect is not good.

[0004] Summary of the Invention

[0005] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and provide a mineral-reinforced PC / ABS alloy with good appearance and high performance and a preparation method thereof.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] The present invention provides a mineral-reinforced PC / ABS alloy with good appearance and high performance, wherein the alloy comprises the following components in parts by weight:

[0008] As an embodiment of the present invention, the PC resin is a bisphenol A polycarbonate resin, and its melt index at 300° C. / 1.2 kg is 8 to 20 g / 10 min.

[0009] As one embodiment of the present invention, the ABS resin has a weight average molecular weight of 120,000 to 160,000 g / mol, a rubber content of 5 to 30 wt.%, an acrylonitrile content of 20 to 30 wt.%, a styrene content of 40 to 70 wt.%, and a melt index of 10 to 15 g / min at 220°C*10kg.

[0010] As one embodiment of the present invention, the ABS masterbatch is a composite of acrylonitrile-butadiene-styrene (ABS), talc, a lubricant, an antioxidant, a compatibilizer, and an anti-dripping agent. The components are weighed by weight, wherein the ABS resin has a weight-average molecular weight of 120,000 to 160,000 g / mol and is present in 40 to 70 parts by weight; talc is present in 25 to 55 parts; a lubricant content is 0.1 to 1 part; an antioxidant content is 0.1 to 2 parts; a compatibilizer content is 1 to 5 parts; and an anti-dripping agent content is 0.1 to 1.1 parts. The addition ratio is obtained by internal verification. If the anti-dripping agent is added too little, its fiber-forming network in the alloy is low and insufficient to weaken the flow and precipitation of minerals. At the same time, if the anti-dripping agent is added too much, its fiber-forming network in the alloy is high, which can easily cause a sharp increase in the viscosity of the alloy system, causing screw slippage and the inability to extrude the barrel particles normally.

[0011] The antioxidant is one or more of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], n-octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, tris(2,4-di-tert-butyl)phenyl phosphite, and dioctadecyl pentaerythritol bisphosphite. The lubricant includes one or more of silicone oil, silicone powder, pentaerythritol ester, and ethylene bisstearamide. The compatibilizer is one or more of styrene-acrylonitrile-glycidyl acrylate, ethylene-vinyl acetate copolymer-functionalized maleic anhydride, and styrene-maleic anhydride-acrylonitrile. The anti-dripping agent is one or more of pure polytetrafluoroethylene powder, polytetrafluoroethylene emulsion, and polytetrafluoroethylene coating.

[0012] As one embodiment of the present invention, the preparation method of the ABS masterbatch comprises the following steps:

[0013] (1) Mixing ABS resin, talc, lubricant, antioxidant, compatibilizer and anti-dripping agent in a mixer according to the proportion for 5 to 30 minutes;

[0014] (2) The mixture obtained in step (1) is placed in a twin-screw extruder with a barrel temperature of 180-240° C. and a screw speed of 200-600 rpm, and granulated to obtain ABS masterbatch.

[0015] As an embodiment of the present invention, the twin-screw extruder includes 10 temperature control zones, the temperature of temperature control zones 1 to 2 is 180 to 210°C, the temperature of temperature control zones 3 to 4 is 190 to 220°C, the temperature of temperature control zones 5 to 6 is 190 to 220°C, the temperature of temperature control zones 7 to 8 is 190 to 230°C, and the temperature of temperature control zones 9 to 10 is 200 to 240°C.

[0016] As an embodiment of the present invention, the compatibilizer is one or more of styrene-acrylonitrile-glycidyl acrylate, ethylene-vinyl acetate copolymer-functionalized maleic anhydride, and styrene-maleic anhydride-acrylonitrile.

[0017] As an embodiment of the present invention, the anti-dripping agent is one or more of pure polytetrafluoroethylene powder, polytetrafluoroethylene emulsion, and polytetrafluoroethylene coating.

[0018] As an embodiment of the present invention, the toughening agent is one or more of methyl methacrylate, butadiene, styrene terpolymer, and acrylic copolymer.

[0019] As an embodiment of the present invention, the antioxidant is one or more of tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]pentaerythritol, 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, tris(2,4-di-tert-butyl)phenyl phosphite, and dioctadecyl pentaerythritol bisphosphite.

[0020] As an embodiment of the present invention, the lubricant includes one or more of silicone oil, silicone powder, pentaerythritol ester, and ethylene bisstearamide.

[0021] The present invention also provides a method for preparing a mineral-reinforced PC / ABS alloy with good appearance and high performance, comprising mixing the PC resin, ABS resin, ABS masterbatch, a compatibilizer, a toughening agent, an antioxidant and a lubricant; adding the mixture into a twin-screw extruder for melt blending and extrusion, controlling the extrusion temperature to be 220-260° C., the screw speed to be 200-500 rpm, and the pressure to be 2-3 MPa; and obtaining the product after underwater pelletizing and drying.

[0022] As an embodiment of the present invention, the mixing is carried out in a high-speed mixer with a rotation speed of 100 to 300 r / min and the mixing time is 10 to 30 minutes.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1) The present invention uses an anti-dripping agent to form a fiber network in the ABS mineral masterbatch, weakening the mineral from flowing to the surface during the PC / ABS injection molding process to cause precipitation, while also reducing the degradation reaction between the mineral and PC, thereby obtaining a mineral-reinforced PC / ABS alloy with good appearance and high performance;

[0025] 2) The mineral-reinforced PC / ABS alloy with good appearance and high performance prepared by the present invention is particularly suitable for parts with complex structures and multi-point injection molds. For the fields of home appliances and automobiles with complex shapes, it not only does not affect the overall performance of the material, but also can obtain products with excellent appearance. DETAILED DESCRIPTION

[0026] The present invention will be described in detail below with reference to the examples. The following examples will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that those skilled in the art may make several adjustments and improvements without departing from the scope of the present invention. These all fall within the scope of protection of the present invention.

[0027] The raw materials used in the comparative examples and embodiments are specifically:

[0028] Bisphenol A polycarbonate with a weight average molecular weight of 40,000 to 80,000 g / mol was selected, specifically Mitsubishi Gas S-3000F, which has a melt index of 17 g / 10 min at 300°C*1.2 kg. ABS resin with a weight average molecular weight of 120,000 to 160,000 g / mol, a rubber content of 5 to 30%, an acrylonitrile content of 20 to 30%, and a styrene content of 40 to 70%, specifically ABS 8434 from Takahashi Petrochemical, was used. The ABS masterbatch was homemade. The talc powder was commercially available PT-559 with a D50 of 2.6 to 3.2 μm. The compatibilizer was SAG-001 from Nantong Rizhisheng. The toughening agent was EM500 from LG. The anti-dripping agent was commercially available SN3300B7, and the coating layer was SAN. The antioxidant was IRGANOX 1010 from BASF (the antioxidant in Table 2). The lubricant was PETS (pentaerythritol stearate); the antioxidants were 168 and 245 (Table 1).

[0029] The ABS masterbatch is a compound of acrylonitrile-butadiene-styrene (ABS), talc, lubricant, antioxidant, compatibilizer and anti-dripping agent; each component is weighed by weight, and the prepared masterbatches are ABS masterbatch 0#, ABS masterbatch 1#, ABS masterbatch 2# and ABS masterbatch 3#, as shown in Table 1 below.

[0030] The preparation method of the above-mentioned ABS masterbatch comprises the following steps:

[0031] (1) ABS resin, talc, lubricant, antioxidant, compatibilizer and anti-dripping agent in Table 1 were mixed in a mixer according to weight for 10 minutes;

[0032] (2) placing the mixture obtained in step (1) in a twin-screw extruder, setting the barrel temperature at 180°C in temperature control zones 1-2, 200°C in temperature control zones 3-4, 210°C in temperature control zones 5-6, 230°C in temperature control zones 7-8, and 240°C in temperature control zones 9-10, and extruding at a screw speed of 400 rpm, and granulating to obtain ABS masterbatch.

[0033] Table 1

[0034] In Tables 1 and 2, the selection of lubricant, compatibilizer, and anti-dripping agent is the same.

[0035] The preparation method of PC / ABS alloy comprises the following steps:

[0036] (1) The substances in Table 2 were mixed uniformly in a high-speed mixer according to their weight parts at a speed of 150 r / min for 10 min.

[0037] (2) The mixture obtained in step (1) is placed in a twin-screw extruder, the barrel temperature is set at 220°C in temperature control zones 1-2, 230°C in temperature control zones 3-4, 240°C in temperature control zones 5-6, 250°C in temperature control zones 7-8, and 260°C in temperature control zones 9-10, the screw speed is 400 rpm, and granulation is performed to obtain PC / ABS alloy.

[0038] Table 2

[0039] Performance testing

[0040] After the composition particles prepared in the above comparative examples and examples were fully dried, they were injection molded into strips and subjected to various performance tests. Large high-gloss boards were also injection molded to compare appearance effects.

[0041] Table 3

[0042] Note: The more “☆” there are, the better the injection molding appearance is.

[0043] The test results of the comparative examples and embodiments are shown in Table 3. The tensile strength is tested according to the ISO527 standard, the sample size (mm): 135*10*4, and the tensile speed is 5mm / min; the bending performance is tested according to the ISO178 standard, the sample size (mm): 80*10*4, and the tensile speed is 2mm / min; the notched impact strength is tested according to the ISO179 standard, the sample size (mm): 80*10*4, the notch type is Class A, the remaining width at the bottom of the notch is 8±0.2mm, and the test conditions are 5.5J and 23°C; the heat deformation temperature is tested according to the ISO75 standard, the sample size (mm): 80*10*4, and the test conditions are 1.80MPa and 120°C / h; the appearance evaluation is performed by injection molding a large high-gloss board to evaluate defects such as mineral precipitation on the appearance surface, and the large high-gloss board size (mm): 100*90*3.

[0044] Comparing Comparative Example 1 and Comparative Example 2, it can be found that the notched impact strength of the two-step method (preparing ABS masterbatch first and then preparing PC / ABS alloy) is increased from 15 to 28.1 KJ / m compared to the one-step method. 2 , and the injection molding appearance is relatively good; comparing comparative example 1 with example 1, example 2 and example 3, it can be found that when the anti-dripping agent in the ABS masterbatch is increased to 0.1, 0.6 and 1.1 parts by weight respectively, the impact strength increases from 28.1KJ / m 2 Increased to 36.4KJ / m 2 and 38.1KJ / m 2 Later it dropped to 26.2KJ / m 2 , and the injection molding appearance first gradually improves, and then the appearance is poor; comparing Comparative Example 3 with Example 4 and Example 5, it can be found that when the PC content is high, the injection molding appearance and impact performance are poor, that is, in order to obtain a product with better appearance and performance, it is recommended to use 40-70 parts of PC resin, 5-25 parts of ABS resin, 15-40 parts of ABS masterbatch, 2-5 parts of toughening agent, 0.5-5 parts of compatibilizer, 0.1-2 parts of antioxidant, and 0.1-2 parts of lubricant.

[0045] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art may make various variations or modifications within the scope of the claims, which do not affect the essence of the present invention.

Claims

1. A mineral-reinforced PC / ABS alloy, characterized in that: The alloy comprises the following components in parts by weight:

2. The mineral-reinforced PC / ABS alloy according to claim 1, characterized in that: The PC resin is a bisphenol A polycarbonate resin, and has a melting index of 8 to 20 g / 10 min at 300° C. / 1.2 kg.

3. The mineral-reinforced PC / ABS alloy according to claim 1, characterized in that: The ABS resin has a weight average molecular weight of 120,000 to 160,000 g / mol, a rubber content of 5 to 30 wt.%, an acrylonitrile content of 20 to 30 wt.%, a styrene content of 40 to 70 wt.%, and a melt index of 10 to 15 g / min at 220° C.*10 kg.

4. The mineral-reinforced PC / ABS alloy according to claim 1, characterized in that: The ABS masterbatch is a composite of acrylonitrile-butadiene-styrene ABS, talcum powder, lubricant, antioxidant, compatibilizer and anti-dripping agent; wherein the ABS resin has a weight average molecular weight of 120,000-160,000 g / mol, 40-70 parts by weight, 25-55 parts by weight of talcum powder, 0.1-1 part by weight of lubricant, 0.1-2 parts by weight of antioxidant, 1-5 parts by weight of compatibilizer and 0.1-1.1 parts by weight of anti-dripping agent.

5. The mineral-reinforced PC / ABS alloy according to claim 1, characterized in that: The compatibilizer is one or more of styrene-acrylonitrile-glycidyl acrylate, ethylene-vinyl acetate copolymer-functionalized maleic anhydride, and styrene-maleic anhydride-acrylonitrile.

6. The mineral-reinforced PC / ABS alloy according to claim 1, characterized in that: The toughening agent is one or more of methyl methacrylate, butadiene, styrene terpolymer, and acrylic copolymer.

7. The mineral-reinforced PC / ABS alloy according to claim 1, characterized in that: The antioxidant is one or more of tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]pentaerythritol, 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, tris(2,4-di-tert-butyl)phenyl phosphite, and dioctadecyl pentaerythritol diphosphite; the lubricant is one or more of silicone oil, silicone powder, paraffin, stearic acid, butyl stearate, oleamide, and ethylene bisstearamide.

8. A method for preparing a mineral-reinforced PC / ABS alloy as claimed in any one of claims 1 to 7, characterized in that: The PC resin, ABS resin, ABS masterbatch, compatibilizer, toughening agent, antioxidant and lubricant are mixed; the mixture is added into a twin-screw extruder for melt blending and extrusion, the extrusion temperature is controlled to be 220-260° C., the screw speed is 200-500 rpm, the pressure is 2-3 MPa, and the product is obtained after underwater pelletizing and drying.

9. The method for preparing the mineral-reinforced PC / ABS alloy according to claim 8, characterized in that: The mixing is carried out in a high-speed mixer, the speed of the high-speed mixer is 100-300 r / min, and the mixing time is 10-30 min.

10. The method for preparing the mineral-reinforced PC / ABS alloy according to claim 8, characterized in that: The preparation method of the ABS masterbatch comprises the following steps: (1) ABS resin, talcum powder, lubricant, antioxidant, compatibilizer and anti-dripping agent are mixed in a mixer according to the following weight ratio for 5 to 30 minutes: ABS resin weight 40-70 parts; talc powder 25-55 parts; lubricant 0.1-1 parts; antioxidant 0.1-2 parts; compatibilizer 1-5 parts; anti-dripping agent 0.1-1.1 parts; (2) placing the mixture obtained in step (1) in a twin-screw extruder with a barrel temperature of 180 to 240° C. and a screw speed of 200 to 600 rpm for granulation to obtain ABS masterbatch.

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