Toughened PC / ABS alloy material added with ABS defective material and preparation method of toughened PC / ABS alloy material

Abstract

The invention discloses a toughened PC (polycarbonate) / ABS (acrylonitrile-butadiene-styrene) alloy material added with an ABS (acrylonitrile-butadiene-styrene) defective material and a preparation method of the toughened PC / ABS alloy material. 10 to 15 parts of a new ABS material; 45 to 60 parts of PC; 3-8 parts of a toughening compatilizer; 0.1 to 0.5 part of an antioxidant; 0.1 to 0.5 part of a lubricant; and 1-2 parts of black masterbatch. The preparation method comprises the following steps: drying, mixing, extruding and granulating. According to the invention, a certain proportion of the ABS defective material is added as a formula of the toughened PC / ABS alloy, and PC and ABS are subjected to blending modification to prepare the PC / ABS alloy material, so that on one hand, the heat resistance, impact resistance and tensile strength of ABS can be improved, the ABS defective material can be recycled, on the other hand, the PC cost and melt viscosity can be reduced, the fluidity can be improved, and the processability can be improved; the sensitivity of internal stress and impact strength of the product to the thickness of the product is reduced.

Description

Technical Field

[0001] The invention relates to the field of thermoplastic resin compositions in polymer materials, and in particular to a toughened PC / ABS alloy material obtained by modifying ABS (acrylonitrile-butadiene-styrene) scrap material and a preparation method thereof. Background Art

[0002] PC (Polycarbonate) is a thermoplastic material with excellent comprehensive performance. Its transparency is as high as 90%, and it is both rigid and tough. It has the characteristics of high impact resistance, dimensional stability, good electrical insulation, heat resistance and non-toxicity. It can easily achieve the desired effect through injection molding, extrusion molding and other process methods, so it has developed rapidly. However, although PC has excellent performance in the field of engineering plastics, its crack resistance and chemical resistance are relatively poor, it is easy to hydrolyze at high temperature, its compatibility with other resins is not ideal, and it lacks self-lubrication.

[0003] On the other hand, ABS (Acrylonitrile-Butadiene-Styrene) is a material made of three monomers, which can show the synergistic performance of the three components. Therefore, ABS has good chemical resistance, rigidity and fluidity, high surface hardness, dimensional stability, and is easy to form and machine. As a general material, the consumption of ABS is quite large, and a large amount of defective materials and sprue materials will be generated during the production process. Therefore, modifying ABS recycled materials so that they can be reused not only helps to reduce costs, but also has important environmental significance.

[0004] Therefore, how to solve the above-mentioned deficiencies in the prior art has become a subject to be studied and solved by the present invention. Summary of the invention

[0005] The purpose of the present invention is to provide a toughened PC / ABS alloy material added with ABS secondary materials and a preparation method thereof.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A toughened PC / ABS alloy material with ABS scrap added, comprising the following components in parts by mass:

[0008]

[0009]

[0010] In a further technical solution, the new ABS material is bulk ABS. In the process of bulk ABS synthesis and development of alloy special materials, the process is simple, the process is short, no emulsifier is required, and no sewage is discharged. In addition, bulk ABS and PC blending can significantly improve the stress cracking of PC.

[0011] According to a further technical solution, the molecular weight of the PC is greater than 30,000.

[0012] In a further technical solution, the toughening compatibilizer is styrene acrylonitrile copolymer (SAN), which acts as both a compatibilizer and a toughening agent, and can not only improve the compatibility of PC and ABS, but also improve the toughness, impact strength, and processing thermal stability of PC / ABS.

[0013] In a further technical solution, the antioxidant is a mixture of one or more of antioxidant 168, antioxidant 1010, and antioxidant 168.

[0014] The chemical name of antioxidant 1010 is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, which is a white crystalline powder; antioxidant 168 is a phosphite antioxidant with excellent performance, which is stable to hydrolysis and can significantly improve the photostability of the product. Antioxidant 1010 and antioxidant 168 can produce a synergistic effect when used together to achieve a better antioxidant effect.

[0015] In a further technical solution, the lubricant is pentaerythritol stearate (PETS), which is a white, hard, high-melting-point waxy substance widely used in thermoplastic engineering materials such as polycarbonate, nylon, polyphenylene oxide, and polyvinyl chloride.

[0016] According to a further technical solution, the black masterbatch is a carrier-free black masterbatch, which has better compatibility with the polymer used.

[0017] A further technical solution comprises the following components in parts by weight:

[0018]

[0019] A further technical solution comprises the following components in parts by weight:

[0020]

[0021]

[0022] A further technical solution comprises the following components in parts by weight:

[0023]

[0024] Furthermore, the present invention also discloses a method for preparing a toughened PC / ABS alloy material by adding ABS secondary materials, comprising:

[0025] Step 1: Drying

[0026] Dry PC and ABS re-processed materials and ABS new materials at 110℃ and 80℃ for 4-6 hours respectively to remove moisture from the materials, so as to avoid instability due to excessive moisture during material processing;

[0027] Step 2: Mix

[0028] Mix PC, ABS regrind, ABS new material and other components evenly in a high-speed mixer at a speed of 80-90r / min. Stir for at least 30 minutes until fully mixed, thereby improving the strength, toughness and heat resistance of the material;

[0029] Step 3: Extrusion granulation

[0030] The granulation was carried out by extrusion through a 35 twin-screw extruder, the extrusion temperature was 220-250°C, and the screw speed was 180-250r / min, so as to complete the preparation of a toughened PC / ABS alloy material with added ABS secondary material.

[0031] In the above scheme, in step three, the strip-shaped melt extruded from the die passes through a cooling water tank and is sent forward under the guidance of a traction roller to prevent it from sticking together. The strips are pulled to the entrance of the pelletizer, and the particles cut out are uniform in size.

[0032] The ABS regrind described in this article is in granular or crushed flake form. Its performance requirements are: Under 23°C, American standard notched impact ≥15KJ / m 2 , tensile strength ≥40MPa.

[0033] The terms used herein generally have the ordinary meanings of each term used in the art, in the context of the present invention, and in the specific context, unless otherwise noted. Certain terms used to describe the present invention will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art regarding the description of the present invention.

[0034] The working principle and advantages of the present invention are as follows:

[0035] The present invention recycles and modifies ABS scraps by adding a certain proportion of ABS scraps as a formula for toughening PC / ABS alloy. Specifically, the present invention provides a toughened PC / ABS alloy material with ABS scraps added, the formula of which includes ABS scraps, ABS new material, PC, toughening compatibilizer, antioxidant, lubricant, and black masterbatch, which realizes the recycling of ABS scraps on one hand and improves the mechanical properties of the material on the other.

[0036] The present invention prepares a PC / ABS alloy material by blending and modifying PC and ABS. On the one hand, the heat resistance, impact resistance and tensile strength of ABS can be improved, and ABS waste materials can be reused. On the other hand, the PC cost and melt viscosity can be reduced, the fluidity can be increased, the processing performance can be improved, and the sensitivity of the internal stress and impact strength of the product to the thickness of the product can be reduced. DETAILED DESCRIPTION

[0037] The present invention will be further described below in conjunction with embodiments:

[0038] The present invention will be described in detail below. After understanding the embodiments of the present invention, any person skilled in the art can make changes and modifications based on the techniques taught by the present invention without departing from the spirit and scope of the present invention.

[0039] The terms used herein are only for describing specific embodiments and are not intended to be limiting of the present invention. Singular forms such as "a", "this", "here", "this" and "the" as used herein also include plural forms.

[0040] The present invention discloses a toughened PC / ABS alloy material with added ABS secondary material, and the preparation method thereof comprises:

[0041] Step 1: Drying

[0042] Dry PC and ABS re-processed materials and ABS new materials at 110℃ and 80℃ for 4-6 hours respectively to remove moisture from the materials, so as to avoid instability due to excessive moisture during material processing;

[0043] Step 2: Mix

[0044] Mix PC, ABS regrind, ABS new material and other components evenly in a high-speed mixer at a speed of 80-90r / min. Stir for at least 30 minutes until fully mixed, thereby improving the strength, toughness and heat resistance of the material;

[0045] Step 3: Extrusion granulation

[0046] The granulation was carried out by extrusion through a 35 twin-screw extruder, the extrusion temperature was 220-250°C, and the screw speed was 180-250r / min, so as to complete the preparation of a toughened PC / ABS alloy material with added ABS secondary material.

[0047] Performance testing includes:

[0048] 1. Baking ingredients

[0049] The PC / ABS alloy material obtained by granulation is dried by blast drying at 90-100°C for 4-6 hours to remove moisture from the material; prevent the sample from having defects such as cracks, pores, and water splashes;

[0050] 2. Injection molding specimen

[0051] The temperature of the injection molding machine is set to increase from 220°C to 260°C from the feeding section to the nozzle, and the nozzle temperature is 250-260°C, the molding cycle is 48±5s, and the cooling time is 30±3s.

[0052] Example 1

[0053]

[0054] The above mixture is prepared by the above preparation method, and the obtained mixed granules are made into finished products by injection molding. The impact performance and tensile properties are tested by ASTM American Standard, the material density is tested by GB / T 1033.1-2008, and the bending performance is tested by GB / T9341-2008. The results are shown in Table 1.

[0055] Table 1: Properties of PC / ABS alloy obtained in Example 1

[0056] project Measured value <![CDATA[Specific gravity (g / cm 3 )]]> 1.1077 <![CDATA[Impact strength (23 °C) (kJ / M 2 )]]> 62.502 Tensile strength(MPa) 48.484 Bending strength(MPa) 79.044 Flexural modulus (MPa) 2339.579

[0057] Example 2

[0058]

[0059] The above mixture was prepared by the above preparation method, and the obtained mixed granules were made into finished products by injection molding. The impact performance and tensile properties were tested by ASTM American Standard, the material density was tested by GB / T 1033.1-2008, and the bending performance was tested by GB / T9341-2008. The results are shown in Table 2.

[0060] Table 2: Properties of PC / ABS alloy obtained in Example 2

[0061] project Measured value <![CDATA[Specific gravity (g / cm 3 )]]> 1.1215 Impact strength (23℃)(kJ / M2) 66.584 Tensile strength(MPa) 49.678 Bending strength(MPa) 81.657 Flexural modulus (MPa) 2464.74

[0062] Example 3

[0063]

[0064] The above mixture is prepared by the above preparation method, and the obtained mixed granulated material is made into a finished product by injection molding. The impact performance and tensile performance are tested by ASTM American standard, the material density is tested by GB / T 1033.1-2008, and the bending performance is tested by GB / T9341-2008. The results are shown in Table 3.

[0065] Table 3: Properties of PC / ABS alloy obtained in Example 3

[0066] project Measured value <![CDATA[Specific gravity (g / cm 3 )]]> 1.1034 <![CDATA[Impact strength (23°C) (kJ / M 2 )]]> 50.099 Tensile strength(MPa) 47.002 Bending strength(MPa) 78.622 Flexural modulus (MPa) 2186.866

[0067] Comparative Example 1

[0068] Chi Mei PC-365, PC content 65%, corresponding to the test results of the same specifications, see Table 4.

[0069] Comparative Example 2

[0070] Formosa Chemicals AC-2400, PC content 60%, test results of test pieces with the same specifications are shown in Table 4.

[0071] Comparative Example 3

[0072] Chi Mei PC-345, PC content 45%, corresponding to the same specification of the test piece test results, see Table 4.

[0073] Table 4 Performance comparison between examples and comparative examples

[0074]

[0075] It can be seen from Table 4 that the embodiments of the present invention can still maintain high impact performance by adding a certain proportion of ABS secondary materials and then combining them with ABS, PC materials and suitable toughening agents and compatibilizers.

[0076] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A toughened PC / ABS alloy material with added ABS secondary material, characterized by: The composition includes the following components in parts by weight: 25~35 parts of ABS regrind; 10~15 parts of ABS new material; PC 45~60 copies; 3~8 parts of toughening compatibilizer; Antioxidant 0.1~0.5 parts; Lubricant 0.1~0.5 parts; 1~2 parts black masterbatch.

2. The toughened PC / ABS alloy material with added ABS secondary material according to claim 1, characterized in that: The new ABS material is bulk ABS.

3. The toughened PC / ABS alloy material with added ABS secondary material according to claim 1, characterized in that: The molecular weight of the PC is greater than 30,000.

4. The toughened PC / ABS alloy material with added ABS secondary material according to claim 1, characterized in that: The toughening compatibilizer is a styrene acrylonitrile copolymer.

5. The toughened PC / ABS alloy material with added ABS secondary material according to claim 1, characterized in that: The antioxidant is a mixture of one or more of antioxidant 168, antioxidant 1010, and antioxidant 168.

6. The toughened PC / ABS alloy material with added ABS secondary material according to claim 1, characterized in that: The lubricant is pentaerythritol stearate.

7. The toughened PC / ABS alloy material with added ABS secondary material according to claim 1, characterized in that: The black masterbatch is a carrier-free black masterbatch.

8. The toughened PC / ABS alloy material with added ABS secondary material according to claim 1, characterized in that: The composition includes the following components in parts by weight: ABS regrind 25 parts; ABS new material 15 parts; PC 55 copies; 5 parts of toughening compatibilizer; 0.15 parts of antioxidant; Lubricant 0.1 part; 1 part black masterbatch.

9. The toughened PC / ABS alloy material with added ABS secondary material according to claim 1, characterized in that: The composition includes the following components in parts by weight: ABS regrind 25 parts; ABS new material 10 parts; PC 60 copies; 5 parts of toughening compatibilizer; Antioxidant 0.33 parts; Lubricant 0.18 parts; 1 part black masterbatch.

10. The toughened PC / ABS alloy material with added ABS secondary material according to claim 1, characterized in that: The composition includes the following components in parts by weight: 35 parts of ABS scraps; ABS new material 15 parts; PC 45 copies; 5 parts of toughening compatibilizer; Antioxidant 0.33 parts; Lubricant 0.18 parts; 1 part black masterbatch.

11. A method for preparing a toughened PC / ABS alloy material by adding ABS secondary material, characterized in that: Used for preparing a toughened PC / ABS alloy material with added ABS secondary material as claimed in any one of claims 1 to 10, the preparation method comprising: Step 1: Drying Dry PC and ABS regrind and ABS new material with forced air at 110℃ and 80℃ for 4~6h respectively to remove moisture from the materials; Step 2: Mix Mix PC, ABS regrind, ABS new material and other components in a high-speed mixer at a speed of 80-90 r / min for at least 30 minutes until fully mixed; Step 3: Extrusion granulation The extrusion granulation is carried out through a twin-screw extruder, the extrusion temperature is 220-250°C, and the screw speed is 180-250r / min, so as to complete the preparation of a toughened PC / ABS alloy material with added ABS secondary material.

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