Glass fiber reinforced PC / PET alloy low-temperature-resistant flame-retardant material

Abstract

The invention relates to a glass fiber reinforced PC (polycarbonate) / PET (polyethylene terephthalate) alloy low-temperature-resistant flame-retardant material, which is characterized by being prepared from the following components in parts by weight: 35 to 47 parts of polycarbonate, 20 to 23 parts of polysiloxane-polycarbonate random copolymer, 20 to 25 parts of PET, 10 to 15 parts of glass fiber, 0.4 part of antioxidant, 2 parts of flame retardant and 0.3 part of anti-dripping agent. The problem that the compatibility of PC and PET is poor is solved, the fluidity and toughness of the composition are improved by adding the polysiloxane-polycarbonate random copolymer, the low-temperature-resistant mechanical property and flame retardance of the composition are enhanced, the preparation process is simple, the processability is good, and the product is good in tensile strength, low-temperature impact property and flame retardance and suitable for industrial production.

Description

Technical Field

[0001] The invention relates to the technical field of polycarbonate materials, in particular to a glass fiber reinforced PC / PET alloy low temperature resistant flame retardant material. Background Art

[0002] Polycarbonate (PC for short) has extremely high impact strength, good thermal stability and dimensional stability, and is widely used in electronic appliances, automobiles, etc. However, polycarbonate has notch sensitivity and stress cracking, and its impact toughness deteriorates under the action of notches or stress. In order to improve the above properties of polycarbonate, polycarbonate is usually toughened and modified by adding acrylic toughening agents, styrene toughening agents, rubber elastomers, etc. to polycarbonate. Toughening agents such as rubber elastomers can toughen well, but the amount added is relatively high, generally more than 8% is required to be effective. However, the addition of too much rubber toughening agent will lead to a decrease in the strength and modulus of polycarbonate, and the rigidity will also be affected, which will directly affect its application in gears.

[0003] Improving the performance of polycarbonate through alloys has gradually become a mainstream technology. As a semi-crystalline material, PET has good solvent resistance and processing fluidity, and is easy to form, but has poor heat resistance and low impact strength. The alloy material of polycarbonate and PET has excellent properties that single components do not have. It can effectively improve the problems of poor processing fluidity, stress cracking and solvent resistance of PC, improve the impact strength and aging resistance of PET, and reduce the cost of PC. PC and PET have a certain degree of compatibility, but due to the huge difference in the crystallization properties of PC and PET, different reaction conditions, and different degrees of ester exchange reaction during the blending process, the compatibility of PC / PET alloy materials is poor, which affects the low tensile strength of the alloy material, poor low-temperature impact performance, and poor flame retardancy, thus limiting its application. Summary of the invention

[0004] The purpose of the present invention is to provide a glass fiber reinforced PC / PET alloy low temperature resistant flame retardant material in view of the above defects.

[0005] To achieve the above object, the technical solution adopted by the present invention is: A glass fiber reinforced PC / PET alloy low temperature resistant flame retardant material, characterized in that it is composed of the following components by weight: 35-47 parts of polycarbonate, 20-23 parts of polysiloxane-polycarbonate random copolymer, 20-25 parts of PET, 10-15 parts of glass fiber, 0.4 parts of antioxidant, 2 parts of flame retardant, and 0.3 parts of anti-drip agent; The glass fiber reinforced PC / PET alloy low temperature resistant flame retardant material is prepared by the following method: polycarbonate is placed in a No. 1 silo; polysiloxane-polycarbonate random copolymer, PET, antioxidant, flame retardant and anti-drip agent are evenly mixed and placed in a No. 2 silo; materials in the No. 1 silo and the No. 2 silo are fed into a twin-screw extruder at a uniform speed according to a proportion through a metering scale; glass fiber is fed into the twin-screw extruder through a side line feeding; all materials are melt-extruded and then cooled, blow-dried and granulated, and the performance is analyzed and packaged.

[0006] Furthermore, the melt flow rate of the polycarbonate at 300° C. / 1.2 kg is 15-20 g / (10 min).

[0007] Furthermore, the melt flow rate of the PET at 270° C. / 1.2 kg is 10-35 g / 10 min.

[0008] Furthermore, the weight of the polysiloxane block in the polysiloxane-polycarbonate random copolymer accounts for 1822% of the total weight of the copolymer, and the melt flow rate is 1-5 g / (10 min).

[0009] Furthermore, the glass fiber is a chopped glass fiber with a diameter of 14 μm and a length greater than 20 mm.

[0010] Furthermore, the antioxidant is 1010, the flame retardant is UV-P, and the anti-drip agent is SN3300B3.

[0011] Furthermore, in the preparation method, the polysiloxane-polycarbonate random copolymer, PET, antioxidant, flame retardant and anti-drip agent are mixed evenly and placed in the No. 2 silo; the mixing is specifically: 50% of PET is first added to the high mixer, and then the polysiloxane-polycarbonate random copolymer, antioxidant, flame retardant and anti-drip agent are added in sequence, and finally the remaining 50% PET is added, mixed evenly and placed in the No. 2 silo.

[0012] The beneficial effects of the present invention are as follows: overcoming the problem of poor compatibility between PC and PET, improving the fluidity and toughness of the composition by adding a polysiloxane-polycarbonate random copolymer, enhancing its low-temperature resistant mechanical properties and flame retardant properties, having a simple preparation process, good processing performance, good product tensile strength, low-temperature impact performance and flame retardancy, and being suitable for industrial production. DETAILED DESCRIPTION

[0013] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention. Example 1

[0014] A glass fiber reinforced PC / PET alloy low temperature resistant flame retardant material is prepared from the following components according to the proportions in Table 1: polycarbonate, polysiloxane-polycarbonate random copolymer, PET, glass fiber, antioxidant, flame retardant, and anti-drip agent; The specific preparation method is as follows: first add 50% PET into a high-speed mixer, then add polysiloxane-polycarbonate random copolymer, antioxidant, flame retardant and anti-drip agent in sequence, and finally add the remaining 50% PET, mix well and place the materials in the No. 2 silo; Put polycarbonate in the No. 1 silo, and feed the materials in the No. 1 silo and the No. 2 silo into the twin-screw extruder at a uniform speed through a metering scale according to the proportion. The glass fiber enters the twin-screw extruder through a side line feeding, and after extrusion molding, it is cooled, blown dry, granulated, and packaged. The glass fiber reinforced PC / PET alloy low-temperature resistant flame retardant material is obtained.

[0015] The material properties were analyzed and the results are shown in Table 2.

[0017] Embodiment 2-5: The distribution ratio of each group is shown in Table 1, the preparation method is the same as Example 1, and the material performance analysis is shown in Table 2.

[0019]

[0020] It can be seen from Table 2 that the tensile strength and flexural strength of the glass fiber reinforced PC / PET alloy are both above 90MPa, the impact strength can be maintained at around 120J / m at a low temperature of -30°C, the flame retardant properties reach V0, and the material properties are excellent.

[0021] According to the disclosure and teaching of the above description, those skilled in the art to which the present invention belongs may also 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 scope of protection of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for the convenience of description and do not constitute any limitation to the present invention.

Claims

1. A glass fiber reinforced PC / PET alloy low temperature resistant flame retardant material, characterized by: It is composed of the following components by weight: 35-47 parts of polycarbonate, 20-23 parts of polysiloxane-polycarbonate random copolymer, 20-25 parts of PET, 10-15 parts of glass fiber, 0.4 parts of antioxidant, 2 parts of flame retardant, 0.3 parts of anti-drip agent; The glass fiber reinforced PC / PET alloy low temperature resistant flame retardant material is prepared by the following method: polycarbonate is placed in a No. 1 silo; polysiloxane-polycarbonate random copolymer, PET, antioxidant, flame retardant and anti-drip agent are evenly mixed and placed in a No. 2 silo; materials in the No. 1 silo and the No. 2 silo are fed into a twin-screw extruder at a uniform speed according to a proportion through a metering scale; glass fiber is fed into the twin-screw extruder through a side line feeding; all materials are melt-extruded and then cooled, blow-dried and granulated, and the performance is analyzed and packaged.

2. A glass fiber reinforced PC / PET alloy low temperature resistant flame retardant material as claimed in claim 1, characterized in that: The polycarbonate has a melt flow rate of 15-20 g / (10 min) under the conditions of 300° C. / 1.2 kg.

3. The glass fiber reinforced PC / PET alloy low temperature resistant flame retardant material according to claim 1, characterized in that: The melt flow rate of the PET at 270° C. / 1.2 kg is 10-35 g / 10 min.

4. The glass fiber reinforced PC / PET alloy low temperature resistant flame retardant material according to claim 1, characterized in that: The weight of the polysiloxane block in the polysiloxane-polycarbonate random copolymer accounts for 1822% of the total weight of the copolymer, and the melt flow rate is 1-5 g / (10 min).

5. The glass fiber reinforced PC / PET alloy low temperature resistant flame retardant material according to claim 1, characterized in that: The glass fiber is a long cut glass fiber with a diameter of 14 μm and a length greater than 20 mm.

6. A glass fiber reinforced PC / PET alloy low temperature resistant flame retardant material as claimed in claim 1, characterized in that: The antioxidant is 1010, the flame retardant is UV-P, and the anti-drip agent is SN3300B3.

7. A glass fiber reinforced PC / PET alloy low temperature resistant flame retardant material as claimed in claim 1, characterized in that: In the preparation method, polysiloxane-polycarbonate random copolymer, PET, antioxidant, flame retardant and anti-drip agent are mixed evenly and then placed in No. 2 silo; the mixing is specifically: 50% of PET is first added into a high-speed mixer, and then the polysiloxane-polycarbonate random copolymer, antioxidant, flame retardant and anti-drip agent are added in sequence, and finally the remaining 50% of PET is added, mixed evenly and then placed in No. 2 silo.

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