High-rigidity pc alloy material and preparation method and application thereof

Abstract

The application relates to a high-rigidity PC alloy material and a preparation method and application thereof, and the PC alloy material comprises the following components and weight contents: 40-80 parts of PC resin, 10-20 parts of high-temperature nylon, 10-40 parts of short-cut carbon fiber, 2-6 parts of a compatilizer, and 0.1-1 part of other additives. The preparation method is that the components are uniformly stirred in a mixing barrel, and are added into a double screw through a main feeding port; the short-cut carbon fiber is added into an extruder through a side feeding port, is extruded and granulated through the extruder, and the high-rigidity PC alloy material is obtained. Compared with the prior art, the application can greatly improve the bending modulus of the material, improves the reinforcing effect of the short-cut carbon fiber, thereby improving the rigidity of the material, and plays a role of replacing steel with plastic.

Description

Technical Field

[0001] This invention relates to the fields of polymer blending and polymer molding and processing technology, specifically to a high-rigidity PC alloy material and its preparation method and application. Background Technology

[0002] PC material boasts excellent impact resistance and is easy to injection mold, making it widely applicable. However, due to its low flexural modulus, PC cannot provide structural support. When used in structural components, reinforcement modification is often necessary. Common reinforcement methods include glass fiber reinforcement and carbon fiber reinforcement, but because the material's inherent modulus is low, the reinforcement effect is poor, preventing it from effectively replacing steel and limiting its application. Summary of the Invention

[0003] The purpose of this invention is to provide a high-rigidity PC alloy material, its preparation method and application, which can be used to replace steel with plastic.

[0004] The objective of this invention can be achieved through the following technical solution: a high-rigidity PC alloy material, comprising the following components and their weight percentages:

[0005]

[0006] Preferably, the PC resin has a relative molecular weight of 15,000-30,000 and a glass transition temperature of 140-150°C.

[0007] Preferably, the high-temperature nylon is a poly(hexamethylene terephthalamide) copolymer (PA6T-66).

[0008] Preferably, the high-temperature nylon has a melting point of 295-310℃.

[0009] Preferably, the chopped carbon fiber has a length of 4-12 mm and a bulk density of 400-600 g / L.

[0010] Preferably, the compatibilizer is POE-GMA.

[0011] More preferably, the compatibilizer contains 0.5-1 wt% GMA.

[0012] Preferably, the other additives include one or more of lubricants, antioxidants, and ultraviolet absorbers.

[0013] A method for preparing the above-mentioned high-rigidity PC alloy material includes the following steps:

[0014] (a) Prepare materials according to the formula, premix PC resin, high temperature nylon, compatibilizer and other additives, mix evenly and set aside for use;

[0015] (b) The mixture obtained in step (a) is fed into the extruder through the main feed port of the twin-screw extruder;

[0016] (c) Short carbon fibers are added to a twin-screw extruder through a side feed port, and after blending, melting, extrusion and granulation, a high-rigidity PC alloy material is obtained.

[0017] Preferably, the barrel temperature of the twin-screw extruder is 260-320℃, the screw speed is 200-600rpm, and the pressure is 1.5-2.5MPa.

[0018] An application of the above-mentioned high-rigidity PC alloy material is characterized in that the high-rigidity PC alloy material is used in plastic-to-steel and lightweight automotive products.

[0019] Compared with the prior art, the present invention has the following beneficial effects.

[0020] 1. In existing technologies, chopped carbon fiber has much higher rigidity than PC material, and the difference in modulus between the two is too large. Using chopped carbon fiber to reinforce PC material results in poor reinforcement. In the PC alloy material of this invention, a high-rigidity high-temperature nylon material is introduced to increase the flexural modulus of the substrate, which can significantly improve the flexural modulus of the material, enhance the reinforcement effect of chopped carbon fiber, and thus improve the rigidity of the material, achieving the effect of replacing steel with plastic.

[0021] 2. The addition of the compatibilizer POE-MAH in this invention improves the compatibility between PC and high-temperature nylon, enhances the overall impact resistance of the material, and yields a high-rigidity PC alloy material that replaces steel with plastic.

[0022] 3. The PC alloy material of this invention has a high flexural modulus and can be applied to products such as replacing steel with plastic and lightweighting automobiles, showing broad application prospects. Detailed Implementation

[0023] The embodiments of the present invention will be described in detail below. The following embodiments are implemented based on the technical solution of the present invention, and detailed implementation methods and specific operation processes are given. However, the protection scope of the present invention is not limited to the following embodiments.

[0024] The raw materials used in the following examples and comparative examples are as follows: PC resin is Asahi Kasei L-1250Y; high-temperature nylon (PA6T-66) resin is SH1240 with a melting point of 310℃, produced by Zhejiang Xinli; short-cut carbon fibers with a length of 6mm and a bulk density of 450g / L are produced by Weihai Guangwei Composite Materials Co., Ltd.; compatibilizer POE-GMA (GMA content 0.8wt%) is produced by Rizhisheng Fine Chemicals; other additives include antioxidant B900 (Ciba Specialty Chemicals), ultraviolet absorber Tinuvins UVP (Ciba), and lubricant barium stearate, with a weight ratio of 1:1:1 for each additive.

[0025] The PC materials prepared in Examples 1-4 and Comparative Examples 1-3 were dried at 100°C for 5 hours, and their physical properties were tested using injection molding test strips according to ASTM standards. The specific test standards and conditions are shown in Table 1.

[0026] Table 1

[0027]

[0028] Example 1

[0029] This embodiment provides a high-rigidity PC alloy material that replaces steel with plastic and its preparation method. The specific steps are as follows:

[0030] (1) Prepare materials according to the formula. Premix PC resin, high temperature nylon, compatibilizer and additives in a mixing tank and mix evenly before use.

[0031] (2) The mixture obtained in step (1) is fed into the extruder through the main feed port of the twin-screw extruder;

[0032] (3) Add the chopped carbon fiber into the twin-screw extruder through the side feed port;

[0033] The mixture is fed into the main feed of a twin-screw extruder, and after melt extrusion, cooling, drying, and pelletizing, a sample is obtained. The twin-screw extruder is a co-rotating twin-screw extruder with a screw length-to-diameter ratio of 40:1. The screw barrel is equipped with a vacuum extraction device and a temperature control device. The feed section temperature of the twin-screw extruder is 260℃, the plasticizing section temperature is 280℃, the homogenizing section temperature is 320℃, the screw speed is 400 rpm, and the pressure is 2.5 MPa.

[0034] Example 2

[0035] This embodiment provides a high-rigidity PC alloy material that replaces steel with plastic and its preparation method. The weight ratio of the raw materials is shown in Table 2, and the preparation method is the same as in Embodiment 1.

[0036] Example 3

[0037] This embodiment provides a high-rigidity PC alloy material that replaces steel with plastic and its preparation method. The weight ratio of the raw materials is shown in Table 2, and the preparation method is the same as in Embodiment 1.

[0038] Example 4

[0039] This embodiment provides a high-rigidity PC alloy material that replaces steel with plastic and its preparation method. The weight ratio of the raw materials is shown in Table 2, and the preparation method is the same as in Embodiment 1.

[0040] Comparative Example 1

[0041] This comparative example provides a PC alloy material and its preparation method. The weight ratio of the raw materials is shown in Table 2, and the preparation method is the same as in Example 1.

[0042] Comparative Example 2

[0043] This comparative example provides a PC alloy material and its preparation method. The weight ratio of the raw materials is shown in Table 2, and the preparation method is the same as in Example 1.

[0044] Comparative Example 3

[0045] This comparative example provides a PC alloy material and its preparation method. The weight ratio of the raw materials is shown in Table 2, and the preparation method is the same as in Example 1.

[0046] Table 2

[0047]

[0048] The physical property test results of the PC alloy materials in Examples 1-4 and Comparative Examples 1-3 are shown in Table 3 below.

[0049] Table 3

[0050]

[0051]

[0052] The test results of Examples 1-4 and Comparative Examples 1-3 in Table 3 show that in the prior art, chopped carbon fiber has a much higher rigidity than PC material, and the difference in modulus between the two is too large. Therefore, using chopped carbon fiber to reinforce PC material results in poor reinforcement. By introducing high-rigidity high-temperature nylon material, the flexural modulus of the substrate can be increased, significantly improving the flexural modulus of the material and enhancing the reinforcement effect of chopped carbon fiber, thereby increasing the material's rigidity and achieving a plastic-to-steel substitution effect. Furthermore, the addition of the compatibilizer POE-MAH improves the compatibility between PC and high-temperature nylon, enhancing the overall impact resistance of the material, resulting in a high-rigidity PC alloy material that can replace steel with plastic. This material has a very high flexural modulus and can be applied to products such as plastic-to-steel substitution and automotive lightweighting, showing broad application prospects.

[0053] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A high-rigidity PC alloy material, characterized in that, Includes the following components and their weight percentages: 40-80 parts of PC resin; 10-20 parts of high-temperature nylon; 10-40 parts of short-cut carbon fiber; 2-6 parts compatibilizer; Other adjuvants: 0.1-1 part; The high-temperature nylon is a poly(hexamethylene terephthalamide) copolymer; The compatibilizer is POE-GMA.

2. The high-rigidity PC alloy material according to claim 1, characterized in that, The PC resin has a relative molecular weight of 15,000-30,000 and a glass transition temperature of 140-150℃.

3. The high-rigidity PC alloy material according to claim 1, characterized in that, The high-temperature nylon has a melting point of 295-310℃.

4. The high-rigidity PC alloy material according to claim 1, characterized in that, The chopped carbon fibers have a length of 4-12 mm and a bulk density of 400-600 g / L.

5. The high-rigidity PC alloy material according to claim 1, characterized in that, The compatibilizer contains 0.5-1 wt% GMA.

6. The high-rigidity PC alloy material according to claim 1, characterized in that, The other additives include one or more of lubricants, antioxidants, and ultraviolet absorbers.

7. A method for preparing the high-rigidity PC alloy material according to any one of claims 1 to 6, characterized in that, Includes the following steps: (a) Prepare materials according to the formula, premix PC resin, high temperature nylon, compatibilizer and other additives, mix evenly and set aside for use; (b) The mixture obtained in step (a) is fed into the extruder through the main feed port of the twin-screw extruder; (c) Short carbon fibers are added to a twin-screw extruder through a side feed port, and after blending, melting, extrusion and granulation, a high-rigidity PC alloy material is obtained. The twin-screw extruder has a barrel temperature of 260-320℃, a screw speed of 200-600rpm, and a pressure of 1.5-2.5MPa.

8. An application of the high-rigidity PC alloy material according to any one of claims 1 to 6, characterized in that, The high-rigidity PC alloy material is used in steel-to-plastic and lightweight automotive products.

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