Environment-friendly flame-retardant cable material for new energy automobile charging pile and preparation method of environment-friendly flame-retardant cable material

Abstract

The invention discloses an environment-friendly flame-retardant cable material for a new energy automobile charging pile and a preparation method of the environment-friendly flame-retardant cable material. The environment-friendly flame-retardant cable material is prepared from the following raw materials in parts by weight: 100 parts of TPU elastomer, 20-30 parts of TPEE, 20-50 parts of EPDM, 30-80 parts of a composite flame retardant, 2-10 parts of a smoke suppressant, 0.5-1.5 parts of an antioxidant, 0-6 parts of a lubricant and 5-20 parts of filler. The preparation method comprises the following steps: adding the raw materials into a twin-screw extruder, and carrying out melt blending at 180-220 DEG C to obtain the environment-friendly flame-retardant cable material. The cable material does not contain halogen and is good in flame retardance; the surface of the material is wear-resistant, scratch-resistant and adjustable in brightness; and the extruded wire is soft, easy to bend, good in processability and very excellent in comprehensive performance, and can be widely applied to new energy automobile charging cables.

Description

Technical Field

[0001] The present invention relates to a preparation method of an environmentally friendly flame-retardant cable material, and particularly to a preparation method of an environmentally friendly flame-retardant cable material for a new energy vehicle charging pile. Background Art

[0002] With the continuous development of the automotive industry, limited traditional petrochemical energy also faces the crisis of decreasing day by day. Therefore, how to improve energy utilization efficiency, reduce environmental pollution, and develop new recyclable energy sources is one of the great challenges faced by human society. In recent years, the construction of electric vehicle charging facilities has developed rapidly all over the world. Many fast charging piles have been gradually built in highway service areas, public parking lots, electric vehicle franchise stores, gas stations with conditions, etc., providing convenient conditions for charging electric vehicles. The large-scale construction of the above charging piles has provided opportunities and challenges for the rapid development of charging pile wires. Traditional plastic-sheathed cables have the disadvantage of being not easy to bend due to their high hardness. Although PVC-sheathed cables can be made very soft and flame-retardant, they have problems such as containing halogens and phthalate plasticizers; while rubber cables have complex processes and the materials are difficult to recycle. Therefore, developing an environmentally friendly cable material with green flame retardancy, softness and easy bending, wear resistance, aging resistance, and easy recycling to meet the use requirements of new energy electric vehicle charging pile cables has become a key topic of concern in the industry. Summary of the Invention

[0003] The present invention uses environmentally friendly polyurethane elastomer TPU, polyester elastomer TPEE, and ethylene propylene diene monomer EPDM as the main raw materials, and prepares an environmentally friendly flame-retardant cable material by adding an environmentally friendly composite flame-retardant system, as well as a smoke suppressant, an antioxidant, a lubricant, and a filler through a twin-screw melt blending method. The cable material does not contain halogens and has good flame retardancy; the surface of the material is wear-resistant, scratch-resistant, and the brightness can be adjusted; and the extruded wire is soft, easy to bend, and has good processability, and the comprehensive performance is very excellent, and it can be widely used in new energy vehicle charging cables.

[0004] An environmentally friendly flame-retardant cable material for a new energy vehicle charging pile according to the present invention is characterized in that the preparation method is as follows, and the following substances are expressed in parts by weight:

[0005] Add 100 parts of TPU elastomer, 20 - 30 parts of TPEE, 20 - 50 parts of EPDM, 30 - 80 parts of composite flame retardant, 2 - 10 parts of smoke suppressant, 0.5 - 1.5 parts of antioxidant, 0 - 6 parts of lubricant, and 5 - 20 parts of filler into a twin-screw extruder, and carry out melt blending at a temperature of 180 - 220 °C to obtain an environmentally friendly flame-retardant cable material for a new energy vehicle charging pile.

[0006] The TPU elastomer used in the present invention is polyester-based TPU, with a Shore hardness of 75A to 88A, a tensile strength of ≥30 MPa, and an elongation at break of ≥400%.

[0007] The TPEE elastomer used in the present invention is a polyester-based elastomer with a melting point of 180 to 220 °C, a tensile strength of ≥20 MPa, and an elongation at break of ≥300%.

[0008] The EPDM used in the present invention has a Mooney viscosity ML1+4(100 °C) of 10 to 50.

[0009] The composite flame retardant used in the present invention is a ternary composite of aluminum hydroxide (ATH), polyhedral oligomeric silsesquioxane (POSS), and carbon nanotubes. The ATH used has a particle size of 3 to 5 μm and a thermal decomposition temperature of ≥180 °C; the POSS used is dimethylethylsilyl cage-type polyhedral oligomeric silsesquioxane; the purity of the carbon nanotubes used is ≥99%.

[0010] The smoke suppressant used in the present invention is molybdenum oxide.

[0011] The antioxidant used in the present invention is a composite of phenolic antioxidant 1010 and phosphite co-antioxidant 168, and the ratio of the two is 2:1.

[0012] The lubricant used in the present invention is oleic acid amide, and the filler used is calcium carbonate.

[0013] The length-to-diameter ratio of the twin-screw extruder used in the present invention is 48:1, and it is air-cooled pelletized after extrusion.

[0014] An environment-friendly flame-retardant cable material for new energy vehicle charging piles and its preparation method according to the present invention are characterized as follows:

[0015] The main base material polyurethane elastomer TPU used in the present invention has very high wear and scratch resistance and excellent extrusion processing performance, with excellent comprehensive performance, and can be recycled.

[0016] The composite flame retardant used in the present invention is a ternary composite of aluminum hydroxide (ATH), polyhedral oligomeric silsesquioxane (POSS), and carbon nanotubes. After the ATH is surface-modified with amino silane, it is better compatible with the TPU base material. The silicon-containing POSS can form a Si-O-Si carbon layer structure after combustion, and cooperate with the carbon nanotubes and ATH to further react to form a honeycomb structure of Si-C-Si and Si-C-Al at high temperatures, greatly improving the flame retardant efficiency.

[0017] The smoke suppressant used in the present invention is nano-molybdenum oxide. Molybdenum oxide and ATH can cooperate to achieve a high-efficiency smoke suppression effect. Detailed implementation mode

[0018] The present invention will be described in more detail through the following specific examples and comparative examples, but the present invention is not limited to the specific example content presented below.

[0019] The following examples and comparative examples are for an environmentally friendly flame-retardant cable material for new energy vehicle charging piles. Its mechanical properties are tested according to the ASTM D638-89 standard, and the tensile speed is 500 mm / min. Its flame-retardant properties are tested according to the UL94 standard respectively, and the sample size of LOI is 120×6.5×3 mm 3 , and the sample size of UL94 vertical burning is 125 mm×12.5 mm×3.0 mm. The wire burning is tested according to UL1581.

[0020] The TPU elastomer used in the following examples and comparative examples of the present invention is polyester-based TPU, with a Shore hardness of 75A to 88A, a tensile strength of ≥30 MPa, and an elongation at break of ≥400%.

[0021] The TPEE elastomer used in the following examples and comparative examples of the present invention is a polyester-based elastomer with a melting point of 180 to 220 °C, a tensile strength of ≥20 MPa, and an elongation at break of ≥300%.

[0022] The EPDM used in the following examples and comparative examples of the present invention has a Mooney viscosity ML1+4(100 °C) of 10 to 50.

[0023] The composite flame retardant used in the following examples and comparative examples of the present invention is a ternary composite of aluminum hydroxide (ATH), polyhedral oligomeric silsesquioxane (POSS), and carbon nanotubes. The particle size of the ATH used is 3 to 5 μm, and the thermal decomposition temperature is ≥180 °C; the POSS used is dimethylethylsilyl cage-type polyhedral oligomeric silsesquioxane; the purity of the carbon nanotubes used is ≥99%.

[0024] The smoke suppressant used in the following examples and comparative examples of the present invention is molybdenum oxide.

[0025] The antioxidant used in the following examples and comparative examples of the present invention is a composite of phenolic antioxidant 1010 and phosphite co-antioxidant 168, and the ratio of the two is 2:1.

[0026] The lubricant used in the following examples and comparative examples of the present invention is oleic acid amide, and the filler used is calcium carbonate.

[0027] The aspect ratio of the twin-screw extruder used in the following examples and comparative examples is 48:1, and it is air-cooled and pelletized after extrusion.

[0028] The physical properties of an environmentally friendly flame-retardant cable material for new energy vehicle charging piles in the following examples and comparative examples of the present invention are listed in Table 1.

[0029] Example 1:

[0030] 100 parts of TPU elastomer, 20 parts of TPEE, 20 parts of EPDM, 45 parts of composite flame retardant (including 20 parts of ATH, 20 parts of POSS, 5 parts of carbon nanotubes), 3 parts of molybdenum oxide, 1.5 parts of antioxidant (including 1.0 part of 1010 and 0.5 part of 168), 3 parts of oleic acid amide, and 10 parts of calcium carbonate were respectively added to a twin-screw extruder and melt-extruded at a temperature of 200 °C to obtain an environmentally friendly flame-retardant cable material for new energy vehicle charging piles.

[0031] Example 2:

[0032] 100 parts of TPU elastomer, 30 parts of TPEE, 40 parts of EPDM, 55 parts of composite flame retardant (including 25 parts of ATH, 25 parts of POSS, 5 parts of carbon nanotubes), 3 parts of molybdenum oxide, 1.5 parts of antioxidant (including 1.0 part of 1010 and 0.5 part of 168), 3 parts of oleic acid amide, and 10 parts of calcium carbonate were respectively added to a twin-screw extruder and melt-extruded at a temperature of 200 °C to obtain an environmentally friendly flame-retardant cable material for new energy vehicle charging piles.

[0033] Comparative Example 1:

[0034] 100 parts of TPU elastomer, 30 parts of TPEE, 20 parts of EPDM, 45 parts of composite flame retardant (including 25 parts of ATH, 20 parts of POSS, 0 parts of carbon nanotubes), 0 parts of molybdenum oxide, 1.5 parts of antioxidant (including 1.0 part of 1010 and 0.5 part of 168), 3 parts of oleic acid amide, and 10 parts of calcium carbonate were respectively added to a twin-screw extruder and melt-extruded at a temperature of 200 °C to obtain an environmentally friendly flame-retardant cable material for new energy vehicle charging piles.

[0035] Comparative Example 2:

[0036] 100 parts of TPU elastomer, 30 parts of TPEE, 0 parts of EPDM, 55 parts of composite flame retardant (including 50 parts of ATH, 0 parts of POSS, 5 parts of carbon nanotubes), 3 parts of molybdenum oxide, 1.5 parts of antioxidant (including 1.0 part of 1010 and 0.5 part of 168), 3 parts of oleic acid amide, and 10 parts of calcium carbonate were respectively added to a twin-screw extruder and melt-extruded at a temperature of 200 °C to obtain an environmentally friendly flame-retardant cable material for new energy vehicle charging piles.

[0037] The performance indexes of Examples 1-2 and Comparative Examples 1-2 of the present invention are listed in Table 1:

[0038] Table 1

[0039]

[0040]

[0041] As can be seen from Table 1: An environmentally friendly flame-retardant cable material for a new energy vehicle charging pile prepared according to the embodiments of the present invention: halogen-free, good flame retardancy, the limiting oxygen index (LOI) reaches 35%, UL94 vertical combustion reaches V-O level (3 mm), and the extruded wire can pass the VW-1 combustion test; the surface of the material is wear-resistant and scratch-resistant, and its brightness can be adjusted to matte, foggy or shiny; and the extruded wire is soft and easy to bend, with good processability, and the comprehensive performance is very excellent, and it can be widely used in new energy vehicle charging cable materials.

[0042] The above examples show that the environmentally friendly flame-retardant cable material prepared by the present invention has excellent comprehensive performance and can be used in new energy vehicle charging pile cables.

Claims

1. An environmentally friendly flame-retardant cable material for a new energy vehicle charging pile and a preparation method thereof, characterized in that: The invention is prepared from the following raw materials in parts by weight: 100 parts of TPU elastomer, 20 to 30 parts of TPEE, 20 to 50 parts of EPDM, 30 to 80 parts of composite flame retardant, 2 to 10 parts of smoke suppressant, 0.5 to 1.5 parts of antioxidant, 0 to 6 parts of lubricant and 5 to 20 parts of filler.

2. The environmentally friendly flame-retardant cable material for a new energy vehicle charging pile according to claim 1, characterized in that: The TPU elastomer is a polyester TPU with a Shore hardness of 75A-88A, a tensile strength of ≥30MPa, and an elongation at break of ≥400%.

3. The environmentally friendly flame-retardant cable material for a new energy vehicle charging pile according to claim 1, characterized in that: The TPEE elastomer is a polyester elastomer with a melting point of 180-220° C., a tensile strength of ≥20 MPa, and an elongation at break of ≥300%.

4. The environmentally friendly flame-retardant cable material for a new energy vehicle charging pile according to claim 1, characterized in that: The Mooney viscosity ML1+4 (100°C) of the EPDM is 10-50.

5. The environmentally friendly flame-retardant cable material for a new energy vehicle charging pile according to claim 1, characterized in that: The composite flame retardant is a ternary composite of aluminum hydroxide ATH, polysilsesquioxane POSS and carbon nanotubes. The ATH particle size used is 3-5 μm, and the thermal decomposition temperature is ≥180°C; the POSS used is dimethylethylsilyl cage-type polysilsesquioxane; and the purity of the carbon nanotubes used is ≥99%.

6. The environmentally friendly flame-retardant cable material for a new energy vehicle charging pile according to claim 1, characterized in that: The smoke suppressant is molybdenum oxide.

7. The environmentally friendly flame-retardant cable material for a new energy vehicle charging pile according to claim 1, characterized in that: The antioxidant is a complex of a phenolic antioxidant 1010 and a phosphite auxiliary antioxidant 168, and the ratio of the two is 2:

1.

8. The environmentally friendly flame-retardant cable material for a new energy vehicle charging pile according to claim 1, characterized in that: The lubricant is oleic acid amide, and the filler used is calcium carbonate.

9. The environmentally friendly flame-retardant cable material for a new energy vehicle charging pile according to claim 1, characterized in that: The length-to-diameter ratio of the twin-screw extruder is 48:1, and the pellets are air-cooled after extrusion.

10. An environmentally friendly flame-retardant cable material for a new energy vehicle charging pile as claimed in any one of claims 1 to 9, characterized in that: The specific content of the preparation method is as follows: the TPU elastomer, TPEE, EPDM, composite flame retardant, smoke suppressant, antioxidant, lubricant and filler components mentioned above are added into a twin-screw extruder respectively, and melt-blended at a temperature of 180-220° C. to obtain an environmentally friendly flame-retardant cable material.

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