Low temperature resistant reinforced polycarbonate compositions

Abstract

The application provides a low-temperature-resistant reinforced polycarbonate composition which is prepared from the following components by weight: polycarbonate 54-62 parts, glass fiber 10-20 parts, polysiloxane-polycarbonate random copolymer 10-15 parts, compatilizer 3-6 parts, toughening agent 5-8 parts, lubricant 0.5-1 part, antioxidant 0.5-1 part, ultraviolet absorber 0.5-1 part and brightener 0.8-1.2 parts. The low-temperature-resistant reinforced polycarbonate composition has the advantages of simple preparation process, good appearance, good processing performance, good low-temperature resistance and weather resistance and is suitable for industrial production.

Description

Technical Field

[0001] This invention belongs to the field of polymers, and specifically relates to a low-temperature resistant reinforced polycarbonate composition and its preparation method. Background Technology

[0002] Polycarbonate (PC) with added glass fiber is a commonly used engineering plastic with high strength, high rigidity, high hardness, high wear resistance, and high impact resistance. It also possesses good heat resistance, corrosion resistance, flame retardancy, and electrical insulation, making it suitable for manufacturing parts and components of various complex shapes. However, adding glass fiber to PC can lead to increased brittleness, reduced flowability, and a rougher surface. Furthermore, PC with added glass fiber is sensitive to ultraviolet light; prolonged exposure to sunlight may cause the plastic to yellow or become brittle. Summary of the Invention

[0003] The purpose of this invention is to address the above-mentioned deficiencies by providing a low-temperature resistant reinforced polycarbonate composition.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is: a low-temperature resistant reinforced polycarbonate composition, characterized in that it is composed of the following components in parts by weight:

[0005] The composition comprises 54-62 parts of polycarbonate A and polycarbonate B in a mass ratio of 2:1; 10-20 parts of glass fiber; 10-15 parts of polysiloxane-polycarbonate random copolymer; 3-6 parts of compatibilizer; 5-8 parts of toughening agent; 0.5-1 part of lubricant; 0.5-1 part of antioxidant; 0.5-1 part of UV absorber; and 0.8-1.2 parts of brightener.

[0006] The polycarbonate A is a polycarbonate with a melt flow rate greater than 10 g / 10 min, and the polycarbonate B is a polycarbonate with a melt flow rate less than 8 g / 10 min.

[0007] The glass fiber is a long-cut glass fiber with a diameter of 14μm and a length greater than 20mm.

[0008] The polysiloxane-polycarbonate random copolymer comprises 18-22% of the total weight of the polysiloxane block and has a melt flow rate of 0-15 g / 10 min.

[0009] The compatibilizer is ethylene-methyl acrylate-glycidyl methacrylate, the toughening agent is EMA, the lubricant is pentaerythritol tetraisostearate, the antioxidant is a phenolic antioxidant, the ultraviolet absorber is a benzotriazole, and the brightener is pearlescent powder.

[0010] The preparation method of the low-temperature resistant reinforced polycarbonate composition is as follows: Polycarbonate A is placed in hopper No. 1. In a high-speed mixer, 50% of polycarbonate B is added first, followed by the addition of polysiloxane-polycarbonate random copolymer, compatibilizer, toughening agent, lubricant, antioxidant, UV absorber, and brightener. Finally, the remaining 50% of polycarbonate B is added. After mixing evenly, the material is placed in hopper No. 2. Glass fiber is placed in hopper No. 3. The materials in hoppers No. 1 and No. 2 are fed into the twin-screw extruder at a uniform speed using a weighing scale. The glass fiber in hopper No. 3 is fed into the twin-screw extruder through a side feed line. After extrusion molding, all materials are cooled, dried, granulated, their properties analyzed, and packaged.

[0011] The beneficial effects of this invention are: overcoming the problems of increased brittleness, poor flowability, and rough surface after adding glass fiber to PC; improving the flowability and toughness of the composition by adding polysiloxane-polycarbonate random copolymer, enhancing its low-temperature mechanical properties; improving the surface roughness by adding bright lubricant; having a simple preparation process; having a good appearance; good processing performance; good low-temperature resistance and weather resistance; and being suitable for industrial production.

[0012] The principles and features of the present invention are described below. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0013] Example 1:

[0014] Polycarbonate A: Cangzhou Dahua CH81551002, melt flow rate is 15 g / 10min;

[0015] Polycarbonate B: Mitsubishi E2000, melt flow rate is 5 g / 10min;

[0016] Polysiloxane-polycarbonate random copolymer: Gansu Yinguang Juyin Chemical Co., Ltd., melt flow rate 5g / 10min, polysiloxane block weight 20%;

[0017] Compatibilizer: Ethylene-methyl acrylate-glycidyl methacrylate;

[0018] Toughening agent: EMA;

[0019] Lubricant: Pentaerythritol tetraisostearate;

[0020] Antioxidant: 1076;

[0021] Ultraviolet absorber: UV-P;

[0022] Brightening agent: pearlescent powder.

[0023] According to the weights in Table (I), first add 50% polycarbonate B to the high-speed mixer, then add the polysiloxane-polycarbonate random copolymer, compatibilizer, toughening agent, lubricant, antioxidant, UV absorber and brightener in sequence, and then add the remaining 50% polycarbonate B. After mixing evenly, place the material in silo No. 2; place polycarbonate A in silo No. 1 and glass fiber in silo No. 3. Use a weighing scale to feed the materials in silos No. 1 and No. 2 into the twin-screw extruder at a uniform speed. The glass fiber in silo No. 3 is fed into the twin-screw extruder through a side feed line. After extrusion molding, cooling, drying and granulation are performed. The performance analysis is shown in Table (II). Packaging.

[0024] Examples 2-5: The preparation method is the same as in Example 1. The specific components are shown in Table (I), and the performance analysis is shown in Table (II).

[0025]

[0026]

[0027] Based on the disclosure and teachings of the foregoing specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the invention should also fall within the protection scope of the claims of the present invention. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on the present invention.

Claims

1. A low-temperature resistant reinforced polycarbonate composition, characterized in that: Composed of the following components in parts by weight: The composition comprises 54-62 parts of polycarbonate A and polycarbonate B in a mass ratio of 2:1; 10-20 parts of glass fiber; 10-15 parts of polysiloxane-polycarbonate random copolymer; 3-6 parts of compatibilizer; 5-8 parts of toughening agent; 0.5-1 part of lubricant; 0.5-1 part of antioxidant; 0.5-1 part of UV absorber; and 0.8-1.2 parts of brightener. The low-temperature resistant reinforced polycarbonate composition is prepared by the following method: Polycarbonate A is placed in hopper No.

1. Polycarbonate B, polysiloxane-polycarbonate random copolymer, compatibilizer, toughening agent, lubricant, antioxidant, ultraviolet absorber and brightener are mixed evenly in proportion and placed in hopper No.

2. Glass fiber is placed in hopper No.

3. The materials in hoppers No. 1 and No. 2 are fed into the twin-screw extruder at a uniform speed through a weighing scale. The glass fiber in hopper No. 3 is fed into the twin-screw extruder through a side feed line. After all materials are extruded and formed, cooled, dried and granulated, their properties are analyzed and packaged. The polycarbonate A is a polycarbonate with a melt flow rate greater than 10 g / 10 min, and the polycarbonate B is a polycarbonate with a melt flow rate less than 8 g / 10 min. The glass fiber is a long-cut glass fiber with a diameter of 14μm and a length greater than 20mm; The polysiloxane-polycarbonate random copolymer has a polysiloxane block weight accounting for 20-22% of the total copolymer weight, and a melt flow rate of 5-15 g / 10min.

2. The low-temperature resistant reinforced polycarbonate composition according to claim 1, characterized in that: The compatibilizer is ethylene-methyl acrylate-glycidyl methacrylate, the toughening agent is EMA, the lubricant is pentaerythritol tetraisostearate, the antioxidant is a phenolic antioxidant, the ultraviolet absorber is a benzotriazole, and the brightener is pearlescent powder.

3. The low-temperature resistant reinforced polycarbonate composition according to claim 1, characterized in that: In the preparation method, the material placed in the No. 2 silo is a material that has been uniformly mixed in a high-speed mixer. First, 50% polycarbonate B is added in the high-speed mixer, followed by the addition of polysiloxane-polycarbonate random copolymer, compatibilizer, toughening agent, lubricant, antioxidant, ultraviolet absorber and brightener. Finally, the remaining 50% polycarbonate B is added, and after uniform mixing, the material is placed in the No. 2 silo.

Images