Recycling method of polypropylene cable material

Abstract

The invention provides a recycling method of a polypropylene cable material, and belongs to the technical field of materials. Comprising the following steps: recycling retired cables, crushing an inner shielding layer and an outer shielding layer of a polypropylene wire core to obtain powder containing carbon black, uniformly mixing the powder with organic salt, a flexibilizer and the like, and then putting the mixture into a double-screw extruder for melt extrusion granulation to obtain the material with the antistatic performance. The waste cable material is prepared into the antistatic material, so that the antistatic material can be widely applied to plastic products for the electronic and electric appliance industry and is endowed with new application value, and the additional value of the product is improved. The product with high additional value is more competitive in the market, and can bring better economic benefits to enterprises.

Description

Technical Field

[0001] The invention relates to a method for recycling polypropylene cable materials and belongs to the technical field of materials. Background Art

[0002] Under the national "dual carbon" background, XLPE insulated cables can no longer meet the needs of green and sustainable contemporary social and economic development.

[0003] Polypropylene cables can significantly reduce the manufacturing energy consumption of the cross-linking process and the degassing process; there is no need for a degassing process, and there are fewer byproduct impurities in the insulation; the price is cheap, and the production of cables has cost advantages; the carbon emissions in the production process are reduced by 40%, and it has gradually replaced the traditional XLPE insulated cables to become a rising star in the cable industry. How to protect the environment and achieve resource recycling is a major scientific and technological issue facing the cable industry today. At present, a large number of discarded cables are thrown away and burned every year, which not only pollutes the environment, but also wastes resources. With the rapid development of the cable industry, the use of polypropylene cables has gradually increased, and its recycling after retirement is also an issue that needs attention at present.

[0004] As a thermoplastic material, polypropylene has good mechanical strength and chemical stability. The cable plastics formed after a series of recycling, processing and utilization of retired polypropylene cable materials have a wide range of uses in many fields.

[0005] At present, the recycling process of polypropylene cable materials still faces the following problems: due to the three-layer co-extrusion production process, the polypropylene insulation layer is tightly attached to its inner and outer shielding layers and is difficult to separate and peel off, which limits its recycling and reuse.

[0006] There are currently no cases of recycling and reuse of polypropylene cables, and antistatic polypropylene materials have broad application prospects in the electronics and electrical industry, such as electronic component packaging, antistatic trays, circuit board support structures, etc., providing an additional protective barrier for electronic products.

[0007] In addition to the electronic and electrical industry, this material can also be used in other fields that require antistatic properties, such as medical, aerospace, etc., further expanding its application range.

[0008] Therefore, a feasible and effective method for recycling polypropylene cables is proposed to make them into antistatic materials with a value far higher than that of ordinary plastic recycled products, thus achieving high-value recycling and reuse of polypropylene cables. Summary of the invention

[0009] The purpose of the present invention is to solve the problem that there is no recycling and reuse of polypropylene cables in the prior art.

[0010] In order to achieve the purpose of solving the above problems, the technical solution adopted by the present invention is to provide a method for recycling polypropylene cable materials, comprising the following steps:

[0011] Step 1: Recycle the retired cables and wires, remove the outer shielding layer, non-woven fabric layer, and sheath layer, leaving only the polypropylene core, and crush the inner and outer shielding layers of the polypropylene core to obtain a powder containing carbon black;

[0012] Step 2: Evenly mix the powder containing carbon black obtained in step 1 with other components, wherein the components and their content ratios are:

[0013]

[0014] Step 3: Place the uniformly mixed material obtained in step 2 in a twin-screw extruder for melt extrusion and granulation to obtain a material with antistatic properties.

[0015] Preferably, the lubricant is ethylene bis fatty acid amide.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) Environmental protection and resource utilization

[0018] The preparation of this material can not only recycle and utilize a large amount of polypropylene cable waste, but also realize the resource utilization of waste and help reduce environmental pollution.

[0019] (2) Excellent antistatic performance

[0020] The carbon black component contained in the cable material is combined with organic salt as an antistatic agent, so that the polypropylene cable material has a long-term antistatic effect during use and has excellent performance.

[0021] (3) A new high value-added utilization method for polypropylene cables is proposed

[0022] At the same time, preparing waste cable materials into antistatic materials can be widely used in plastic products for the electronic and electrical industry, giving them new application value and increasing the added value of products. Such high value-added products are more competitive in the market and can bring better economic benefits to enterprises. DETAILED DESCRIPTION

[0023] In order to make the present invention more clearly understood, the preferred embodiments are described in detail as follows:

[0024] The invention provides a method for recycling polypropylene cable materials.

[0025] Example 1

[0026] Step 1: Recycle the retired cables and wires, remove the outer shielding layer, non-woven fabric layer, and sheath layer, leaving only the polypropylene core, and crush the inner and outer shielding layers of the polypropylene core to obtain a powder containing carbon black;

[0027] Step 2: Evenly mix the powder containing carbon black obtained in step 1 with other components, wherein the components and their content ratios are:

[0028]

[0029] Step 3: Place the uniformly mixed material obtained in step 2 in a twin-screw extruder for melt extrusion and granulation to obtain a material with antistatic properties.

[0030] The material of the present invention has a hardness of 67, a tensile strength of 29.5 MPa, and an impact strength of 5.2 kJ / m 2 , the surface resistivity is 3×10 -11 Ω, good mechanical strength, excellent antistatic effect, very suitable for the electronic and electrical industry that needs to prevent dust and gas explosions, manufacture and use precision electronic instruments.

[0031] In practical applications, the conductive properties of antistatic materials are usually measured by their surface resistivity. It is generally believed that the surface resistivity is 10 -9 Up to 10 -12 Ohm, the material has antistatic ability. The surface resistivity of the material in this invention is 3×10 -11 Ω, proving that the material has good antistatic effect.

[0032] The above is only a preferred embodiment of the present invention, and is not any formal or substantial limitation of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and supplements without departing from the present invention, and these improvements and supplements should also be regarded as the protection scope of the present invention. Any technician familiar with this profession, without departing from the spirit and scope of the present invention, can make some changes, modifications and equivalent changes made by using the technical content disclosed above, which are equivalent embodiments of the present invention; at the same time, any changes, modifications and evolutions of any equivalent changes made to the above embodiments based on the essential technology of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A method for recycling polypropylene cable material, characterized in that: The following steps are involved: Step 1: Recycle the retired cables and wires, remove the outer shielding layer, non-woven fabric layer, and sheath layer, leaving only the polypropylene core, and crush the inner and outer shielding layers of the polypropylene core to obtain a powder containing carbon black; Step 2: Evenly mix the powder containing carbon black obtained in step 1 with other components, wherein the components and their content ratios are: Step 3: Place the uniformly mixed material obtained in step 2 in a twin-screw extruder for melt extrusion granulation to obtain a material with antistatic properties.

2. The method for recycling polypropylene cable material according to claim 1, characterized in that: The lubricant is ethylene bis fatty acid amide.

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