Impact-resistant PC alloy material, preparation material of impact-resistant PC alloy material and safety toe cap

Abstract

The invention discloses an impact-resistant PC (polycarbonate) alloy material, a preparation material thereof and a safe toe cap, and the PC alloy material comprises the following components in percentage by mass: 50-99 wt% of polycarbonate, 0.3-40 wt% of polyethylene glycol terephthalate, 0.3-5 wt% of thermoplastic polyester elastomer, 0.1-5 wt% of a toughening agent, 0.1-0.5 wt% of an antioxidant and 0.2-0.5 wt% of an anti-hydrolysis agent. The preparation method comprises the following steps: uniformly stirring the thermoplastic polyester elastomer, the flexibilizer, the antioxidant and the anti-hydrolysis agent according to a mass ratio through a low-speed mixer; then adding polycarbonate and polyethylene glycol terephthalate into the uniformly mixed mixture, and uniformly stirring by a low-speed mixer; and finally, melting, mixing and dispersing the uniformly mixed materials in a double-screw extruder, and extruding and granulating to obtain the PC alloy material. The safety toe cap prepared from the PC alloy material is light in weight, high in impact resistance, good in weather resistance and good in chemical corrosion resistance, and meets the standard requirements of GB / T 28288-2012'toe protection toes and anti-puncture pads for foot protection '.

Description

Technical Field

[0001] The invention belongs to the technical field of polymer alloys, and in particular relates to an impact-resistant PC alloy material and a preparation material thereof, and a safety shoe cap. Background Art

[0002] Safety toe cap is the main protective safety component of labor protection safety shoes, and is widely made of metal materials such as steel and aluminum. Metal materials are heavy, have a poor wearing experience, and affect work efficiency. In addition, the toe cap production process is complicated, and the anti-corrosion treatment during production causes great environmental pollution.

[0003] Some safety shoe toe products are made of fiberglass material, but this type of fiberglass toe has poor wear resistance and low folding strength.

[0004] Moreover, the most important thing about the safety toe used as a protective safety shoe is to protect the safety of the wearer, so the safety toe is required to have good impact resistance. However, it is difficult for the safety toe on the market to ensure that the shoe is light in weight and has good impact resistance at the same time. Summary of the invention

[0005] In view of the above technical problems, the present invention provides an impact-resistant PC alloy material, and the safety shoe toe made of the material meets the requirements of GB / T 28288-2012 standard.

[0006] To achieve the above object, the technical solution of the present invention is: The first aspect of the present invention provides an impact-resistant PC alloy material, comprising the following components in parts by weight: 50-99wt% of polycarbonate, 0.3-40wt% of polyethylene terephthalate, 0.3-5wt% of thermoplastic polyester elastomer, 0.1-5wt% of toughening agent, 0.1-0.5wt% of antioxidant and 0.2-0.5wt% of anti-hydrolysis agent.

[0007] In a preferred embodiment, the following components are included in weight: 99 wt % of polycarbonate, 0.3 wt % of polyethylene terephthalate, 0.3 wt % of thermoplastic polyester elastomer, 0.1 wt % of toughening agent, 0.1 wt % of antioxidant and 0.2 wt % of anti-hydrolysis agent.

[0008] In a preferred embodiment, under the test conditions of 230° C. and 2.16 kg, the melt index of the thermoplastic polyester elastomer is 10-20 g / min.

[0009] In a preferred embodiment, the toughening agent is polyolefin elastomer grafted with maleic anhydride.

[0010] In a preferred embodiment, the antioxidant is a compound system of hindered phenol and phosphite.

[0011] In a preferred embodiment, the ratio of the hindered phenol antioxidant to the phosphite antioxidant is 2:1.

[0012] In a preferred embodiment, the anti-hydrolysis agent is a carbodiimide anti-hydrolysis agent.

[0013] In a preferred embodiment, the polycarbonate is bisphenol A polycarbonate.

[0014] The second aspect of the present invention also provides the above-mentioned impact-resistant PC alloy material, comprising the following steps: S1: mixing the thermoplastic polyester elastomer, toughening agent, antioxidant and anti-hydrolysis agent in accordance with mass percentage through a low-speed mixer; S2: adding polycarbonate and polyethylene terephthalate to the mixture prepared in step S1, and stirring the mixture evenly with a low-speed mixer; S3: The materials uniformly mixed in S2 are melted, mixed and dispersed in a twin-screw extruder, and extruded and granulated to obtain the PC alloy material.

[0015] The third aspect of the present invention further provides a safety shoe toe, wherein the material of the safety shoe toe comprises the above-mentioned impact-resistant PC alloy material.

[0016] Due to the adoption of the above technical solution, the present invention has the following advantages and positive effects compared with the prior art: The safety shoe head made of the PC alloy material provided by the present invention is light in weight, high in impact resistance, good in weather resistance, and good in chemical corrosion resistance, and meets the standard requirements of GB / T 28288-2012 "Foot Protection Toe Protection Caps and Anti-Puncture Pads". DETAILED DESCRIPTION

[0017] The impact-resistant PC alloy material and its preparation material and safety shoe toe cap proposed by the present invention are further described in detail below in conjunction with specific embodiments. The advantages and features of the present invention will become more clear according to the following description.

[0018] A first aspect of the present invention provides an impact-resistant PC alloy material, comprising the following components calculated by mass percentage: 50-99wt% of polycarbonate (PC), 0.3-40wt% of polyethylene terephthalate (PET), 0.3-5wt% of thermoplastic polyester elastomer, 0.1-5wt% of toughening agent, 0.1-0.5wt% of antioxidant and 0.2-0.5wt% of anti-hydrolysis agent.

[0019] In some embodiments, under the test conditions of 230°C and 2.16kg, the thermoplastic polyester elastomer has a melt index of 10-20 g / min. Thermoplastic polyester elastomers within this range have very good tensile strength, toughness, resilience, heat resistance, weather resistance and chemical corrosion resistance, and can be toughened, promoted crystallization and improved melt fluidity when blended with PET; and can be improved in low-temperature impact resistance and stress cracking when blended with PC.

[0020] In some embodiments, the toughening agent is polyolefin elastomer grafted with maleic anhydride, and the toughening agent can enhance the compatibility of PC and other materials to improve the overall mechanical properties of the material.

[0021] In some embodiments, the antioxidant is a compound system of hindered phenol and phosphite. The addition of the antioxidant can inhibit or reduce the thermal oxidation reaction rate of PC, significantly improve the heat resistance of the material, delay the degradation and aging process of the material, and extend the service life of the material.

[0022] In some embodiments, the ratio of the hindered phenol antioxidant to the phosphite antioxidant is 2:1.

[0023] In some embodiments, the anti-hydrolysis agent is a carbodiimide anti-hydrolysis agent, and the molecular structure of the anti-hydrolysis agent contains carbodiimide or polycarbodiimide groups. The carbodiimide groups have high reactivity with carboxyl groups and generate urea compounds with stable structures. By utilizing this characteristic of carbodiimide, the carboxyl groups that easily cause self-catalytic hydrolysis of polyester materials can be eliminated, and the molecular chain breakage caused by hydrolysis of the polymer can be effectively inhibited, thereby maintaining the mechanical properties and chemical stability of the material and extending its service life. By adding polycarbodiimide to the formula, the durability and reliability of the material under various application conditions can be significantly improved.

[0024] In a preferred embodiment, the polycarbonate is bisphenol A polycarbonate, which maintains stable physical properties at high temperatures, has high temperature resistance, high impact strength, good dimensional stability, and is not easily broken even when impacted.

[0025] The second aspect of the present invention also provides a method for preparing the above PC alloy material, comprising the following steps: S1. Stirring the thermoplastic polyester elastomer, toughening agent, antioxidant and anti-hydrolysis agent uniformly by a low-speed mixer according to mass percentage; S2, adding polycarbonate and polyethylene terephthalate to the mixture in step S1, and stirring evenly with a low-speed mixer; S3, the materials uniformly mixed in step S2 are melted, mixed and dispersed in a twin-screw extruder, and extruded and granulated to obtain the PC alloy material.

[0026] The PC alloy material and preparation method provided by the present invention have low raw material cost, excellent product performance, and are easy to produce and process on a large scale.

[0027] The present invention will be further described below by way of examples: The raw materials used in Examples 1-4 and Comparative Examples 1-3 are respectively from: polycarbonate is bisphenol A polycarbonate, Luxi Chemical Group Co., Ltd.; polyethylene terephthalate, Saudi Basic Industries Corporation; toughening agent is polyolefin elastomer grafted with maleic anhydride, Nantong Jiuju Polymer Materials Co., Ltd.; thermoplastic polyester elastomer, Jiangsu Keyile New Materials Technology Co., Ltd.; antioxidant is a compound system of hindered phenol and phosphite in a ratio of 2:1, Beijing Jiyi Holding Group Co., Ltd.; anti-hydrolysis agent is polycarbodiimide anti-hydrolysis agent, Shanghai Langyi New Materials Technology Co., Ltd.

[0028] Table 1 Composition ratio of Examples 1-4 and Comparative Examples 1-3 The thermoplastic polyester elastomer, toughening agent, antioxidant and anti-hydrolysis agent in Table 1 are stirred uniformly by a low-speed mixer according to mass percentage; then polycarbonate and polyethylene terephthalate are added to the uniformly mixed mixture, and stirred uniformly by a low-speed mixer; then the uniformly mixed materials are melt-mixed and dispersed in a twin-screw extruder, and extruded into granules to obtain a PC alloy material.

[0029] The specimens prepared in Examples 1-4 and Comparative Examples 1-3 were subjected to the following tests: notched impact strength test was conducted according to ISO179 standard, with a sample size of 80*10*4 mm; bending performance test was conducted according to ISO178, with a sample size of 80*10*4 mm, a bending speed of 2 mm / min, and a span of 64 mm. The test results are shown in Table 2.

[0030] Table 2 Performance test results of Examples 1-4 and Comparative Examples 1-3 The safety toe cap (inner protection toe cap) made of the materials of Examples 1-4 and Comparative Examples 1-3 was tested using GB / T28288-2012. The mass of the impact hammer is 20 ± 0.2 kg, and the shape of the impact hammer is wedge-shaped, with a rectangular surface length of at least 60 mm and a height of at least 40 mm. The two rectangular surfaces intersect at 90° ± 1°, and the top of the intersection should be a fillet with a radius of 3 ± 0.1 mm. The impact energy is 200 ± 4 J. During the test, the toe cap is directly placed on a test platform with a steel base, and then a hard clay with a diameter of 25 ± 2 mm and a height of 30 ± 2 mm is placed on the test axis below the rear of the toe cap for impact testing. The standard requirement for the size 8 toe cap made in this test is that the toe cap safety spacing after impact is 21 mm, and the pressure resistance test (applying a pressure of 15 ± 0.1 KN to the safety toe cap), high temperature resistance, low temperature resistance, acid resistance, alkali resistance and oil resistance treatment after impact The standard for the toe cap safety spacing after impact is 21 mm.

[0031] When testing the safety toe cap, the higher the safety distance measured, the better the toe cap's impact resistance performance. See Table 3 for the test results.

[0032] Table 3 Impact and pressure resistance test results of safety shoe heads made of materials of Examples and Comparative Examples According to Table 3, the safety shoe head made of the material of the embodiment has good impact resistance, good weather resistance, and good chemical corrosion resistance. All performances are far higher than the standard requirements of GB / T 28288-2012 "Foot Protection Toe Protection Caps and Anti-Puncture Pads".

[0033] However, in Comparative Example 1, the impact resistance does not meet the standard after low-temperature treatment, in Comparative Example 2, the impact resistance does not meet the standard after high-temperature treatment, and in Comparative Example 3, the impact resistance does not meet the standard after acid-base resistance treatment.

[0034] Table 4 is a weight comparison of the 8-yard safety shoe head made by the formula of Example 2 and the existing safety shoe head According to Table 4, the weight of the safety shoe toe made of the material of the present invention is only 72.7% of the weight of the glass fiber shoe toe and 55.8% of the weight of the steel shoe toe, which shows that the present invention has achieved lightweight toe while ensuring impact resistance by adjusting the formula ratio.

[0035] The embodiments of the present invention are described in detail above in conjunction with the embodiments, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they still fall within the protection scope of the present invention.

Claims

1. An impact-resistant PC alloy material, characterized in that: The composition comprises the following components in parts by weight: 50-99wt% of polycarbonate, 0.3-40wt% of polyethylene terephthalate, 0.3-5wt% of thermoplastic polyester elastomer, 0.1-5wt% of toughening agent, 0.1-0.5wt% of antioxidant and 0.2-0.5wt% of anti-hydrolysis agent.

2. The impact-resistant PC alloy material according to claim 1, characterized in that: The invention comprises the following components in parts by weight: 99 wt % of polycarbonate, 0.3 wt % of polyethylene terephthalate, 0.3 wt % of thermoplastic polyester elastomer, 0.1 wt % of toughening agent, 0.1 wt % of antioxidant and 0.2 wt % of anti-hydrolysis agent.

3. The impact-resistant PC alloy material according to claim 1 or 2, characterized in that: Under the testing conditions of 230° C. and 2.16 kg, the thermoplastic polyester elastomer has a melt index of 10-20 g / min.

4. The impact-resistant PC alloy material according to claim 1 or 2, characterized in that: The toughening agent is polyolefin elastomer grafted with maleic anhydride.

5. The impact-resistant PC alloy material according to claim 1, characterized in that: The antioxidant is a compound system of hindered phenol and phosphite.

6. The impact-resistant PC alloy material according to claim 5, characterized in that: The ratio of the hindered phenol antioxidant to the phosphite antioxidant is 2:

1.

7. The impact-resistant PC alloy material according to claim 1, characterized in that: The anti-hydrolysis agent is a carbodiimide anti-hydrolysis agent.

8. The impact-resistant PC alloy material according to claim 1, characterized in that: The polycarbonate is bisphenol A type polycarbonate.

9. An impact-resistant PC alloy material as claimed in any one of claims 1 to 8, characterized in that: The following steps are involved: S1: mixing the thermoplastic polyester elastomer, toughening agent, antioxidant and anti-hydrolysis agent in accordance with mass percentage through a low-speed mixer; S2: adding polycarbonate and polyethylene terephthalate to the mixture prepared in step S1, and stirring evenly with a low-speed mixer; S3: The materials uniformly mixed in S2 are melted, mixed and dispersed in a twin-screw extruder, and extruded and granulated to obtain the PC alloy material.

10. A safety shoe toe, characterized in that: The material of the safety shoe head comprises the impact-resistant PC alloy material as described in any one of claims 1-8.

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