High-elasticity low-smoke halogen-free flame-retardant olefin cable material as well as preparation method and application thereof

Abstract

The invention discloses a high-elasticity low-smoke halogen-free flame-retardant olefin cable material as well as a preparation method and application thereof, and belongs to the technical field of cable material preparation. The cable is prepared from the following raw materials in parts by weight: 40-60 parts of an ethylene-vinyl acetate copolymer, 50-70 parts of high-density polyethylene, 15-20 parts of low-density polyethylene, 2-5 parts of a silane coupling agent, 90-120 parts of a flame retardant, 1-2 parts of an antioxidant, 20-40 parts of a polyolefin elastomer and 5-10 parts of a softening agent. The cable prepared by the invention has the advantages of flame retardance, aging resistance, high elasticity and the like, has a wide application prospect in practice, is simple in preparation method, and can be subjected to large-scale industrial production.

Description

Technical Field

[0001] The invention belongs to the technical field of cable material preparation, and specifically relates to a high-elasticity, low-smoke, halogen-free, flame-retardant olefin cable material and a preparation method and application thereof. Background Art

[0002] With the rapid development of the global economy and the enhancement of human environmental awareness, the quality and performance requirements of wires and cables in various fields are getting higher and higher. Fires caused by the aging of wires and cables are also increasing. Therefore, the demand for low-smoke, halogen-free, flame-retardant and environmentally friendly wires and cables is increasing. At present, the production of halogen-free, low-smoke and flame-retardant cable materials mostly adds a large amount of flame retardants to the polyolefin base material to achieve the flame retardant effect.

[0003] During the production, transportation and use of wires and cables, they are inevitably subjected to external pressure, which makes the cables often lack good performance in terms of extrusion resistance, twisting resistance, cold resistance and weather and atmospheric aging resistance. Therefore, the research of a highly elastic, low-smoke, halogen-free, flame-retardant olefin cable material has become a technical problem that needs to be solved urgently. Summary of the invention

[0004] The technical problem solved by the present invention is to provide a high-elasticity, low-smoke, halogen-free, flame-retardant olefin cable material, which has excellent low-smoke, halogen-free, flame-retardant properties, and has excellent elasticity and fire resistance; another technical problem to be solved by the present invention is to provide a method for preparing a high-elasticity, low-smoke, halogen-free, flame-retardant olefin cable material, which is simple and convenient, and the prepared cable material has elasticity and flame retardant properties.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0006] A high-elasticity, low-smoke, halogen-free flame-retardant olefin cable material is prepared from the following raw materials in parts by weight: 40-60 parts of ethylene-vinyl acetate copolymer, 50-70 parts of high-density polyethylene, 15-20 parts of low-density polyethylene, 2-5 parts of silane coupling agent, 90-120 parts of flame retardant, 1-2 parts of antioxidant, 20-40 parts of polyolefin elastomer and 5-10 parts of softener.

[0007] The invention is prepared from the following raw materials in parts by weight: 50-60 parts of ethylene-vinyl acetate copolymer, 50-65 parts of high-density polyethylene, 15-18 parts of low-density polyethylene, 2-3 parts of silane coupling agent, 90-100 parts of flame retardant, 1-1.5 parts of antioxidant, 25-40 parts of polyolefin elastomer and 8-10 parts of softener.

[0008] The flame retardant is selected from one or both of aluminum hydroxide and magnesium hydroxide.

[0009] The antioxidant is phenol.

[0010] The softener is polyethylene wax.

[0011] The polyolefin elastomer is selected from ethylene-propylene copolymer, ethylene-propylene-diene rubber or a mixture of the two or more thereof.

[0012] The above-mentioned high elasticity, low smoke, halogen-free, flame-retardant olefin cable material comprises the following steps:

[0013] 1) Weighing ethylene-vinyl acetate copolymer, high-density polyethylene and low-density polyethylene according to a certain proportion and mixing them thoroughly to obtain a mixture;

[0014] 2) adding a silane coupling agent, a flame retardant, an antioxidant, a polyolefin elastomer POE and a softener to the mixture, mixing them evenly and then kneading them to obtain a kneaded mixture;

[0015] 3) The kneaded mixture is added into a twin-screw extruder and subjected to the processes of extrusion, drawing, air cooling, pelletizing and drying to obtain a high-elasticity, low-smoke, halogen-free flame-retardant olefin cable material.

[0016] The mixing temperature in step 2) is 80-100°C.

[0017] The extrusion temperature of the twin-screw extruder in step 3) is 200-220°C.

[0018] In the step 3), the rotation speed of the twin-screw extruder is 500-800 rpm.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] 1) The cable material prepared by the present invention is used to prepare a high-elastic cable, which can be simply laid and installed without the need for special equipment or processes.

[0021] 2) The cable material of the present invention can be mixed with polyolefin elastomers to obtain a highly elastic and bending-resistant cable material, and the production process is simple and can be mass-produced.

[0022] 3) Compared with the prior art, the cable material of the present invention has the advantages of high elasticity in addition to the properties of flame retardancy, fire resistance, and aging resistance. DETAILED DESCRIPTION

[0023] The present invention is further illustrated below in conjunction with specific examples. The examples are implemented based on the technical solutions of the present invention. It should be understood that these examples are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0024] Example 1

[0025] A method for preparing a high-elasticity, low-smoke, halogen-free, flame-retardant olefin cable material comprises the following steps:

[0026] 1) Weigh 50 parts of ethylene-vinyl acetate copolymer, 60 parts of high-density polyethylene and 15 parts of low-density polyethylene and mix them thoroughly to obtain a mixture;

[0027] 2) adding 2.5 parts of silane coupling agent, 47.5 parts of magnesium hydroxide, 47.5 parts of aluminum hydroxide, 1.5 parts of phenols, 30 parts of ethylene-propylene copolymer and 9 parts of polyethylene wax to the mixture, mixing well and then banburying at a banburying temperature of 80-100° C. to obtain a banburying mixture;

[0028] 3) placing the kneaded mixture in a twin-screw extruder, mixing it for 10 minutes at an extrusion temperature of 200-220° C. and a rotation speed of 500-800 rpm, and after mixing evenly, extruding, drawing, air cooling, pelletizing and drying processes are performed to obtain a high-elasticity, low-smoke, halogen-free flame-retardant olefin cable material.

[0029] Example 2

[0030] A method for preparing a high-elasticity, low-smoke, halogen-free, flame-retardant olefin cable material comprises the following steps:

[0031] 1) Weigh 40 parts of ethylene-vinyl acetate copolymer, 50 parts of high-density polyethylene and 10 parts of low-density polyethylene and mix them thoroughly to obtain a mixture;

[0032] 2) adding 2 parts of silane coupling agent, 45 parts of magnesium hydroxide, 45 parts of aluminum hydroxide, 1 part of antioxidant, 25 parts of ethylene-propylene copolymer and 8 parts of softener to the mixture, mixing well and then kneading to obtain a kneaded mixture;

[0033] 3) placing the kneaded mixture in a twin-screw extruder, mixing it for 10 minutes at an extrusion temperature of 200-220° C. and a rotation speed of 500-800 rpm, and after mixing evenly, extruding, drawing, air cooling, pelletizing and drying processes are performed to obtain a high-elasticity, low-smoke, halogen-free flame-retardant olefin cable material.

[0034] Example 3

[0035] A method for preparing a high-elasticity, low-smoke, halogen-free, flame-retardant olefin cable material comprises the following steps:

[0036] 1) Weigh 60 parts of ethylene-vinyl acetate copolymer, 70 parts of high-density polyethylene and 20 parts of low-density polyethylene and mix them thoroughly to obtain a mixture;

[0037] 2) adding 3 parts of silane coupling agent, 50 parts of magnesium hydroxide, 50 parts of aluminum hydroxide, 2 parts of antioxidant, 40 parts of ethylene-propylene copolymer and 10 parts of softener to the mixture, mixing well and then banburying to obtain a banburying mixture;

[0038] 3) placing the kneaded mixture in a twin-screw extruder, mixing it for 10 minutes at an extrusion temperature of 200-220° C. and a rotation speed of 500-800 rpm, and after mixing evenly, extruding, drawing, air cooling, pelletizing and drying processes are performed to obtain a high-elasticity, low-smoke, halogen-free flame-retardant olefin cable material.

[0039] Example 4

[0040] A method for preparing a high-elasticity, low-smoke, halogen-free, flame-retardant olefin cable material comprises the following steps:

[0041] 1) Weigh 50 parts of ethylene-vinyl acetate copolymer, 60 parts of high-density polyethylene and 15 parts of low-density polyethylene and mix them thoroughly to obtain a mixture;

[0042] 2) adding 2.5 parts of silane coupling agent, 47.5 parts of magnesium hydroxide, 47.5 parts of aluminum hydroxide, 1.5 parts of antioxidant, 34 parts of ethylene-propylene copolymer and 9 parts of softener to the mixture, mixing well and then kneading to obtain a kneaded mixture;

[0043] 3) placing the kneaded mixture in a twin-screw extruder, mixing it for 10 minutes at an extrusion temperature of 200-220° C. and a rotation speed of 500-800 rpm, and after mixing evenly, extruding, drawing, air cooling, pelletizing and drying processes are performed to obtain a high-elasticity, low-smoke, halogen-free flame-retardant olefin cable material.

[0044] Example 5

[0045] A method for preparing a high-elasticity, low-smoke, halogen-free, flame-retardant olefin cable material comprises the following steps:

[0046] 1) Weigh 50 parts of ethylene-vinyl acetate copolymer, 60 parts of high-density polyethylene and 15 parts of low-density polyethylene and mix them thoroughly to obtain a mixture;

[0047] 2) adding 2.5 parts of silane coupling agent, 47.5 parts of magnesium hydroxide, 47.5 parts of aluminum hydroxide, 1.5 parts of antioxidant, 38 parts of ethylene-propylene copolymer and 9 parts of softener to the mixture, mixing well and then kneading to obtain a kneaded mixture;

[0048] 3) placing the kneaded mixture in a twin-screw extruder, mixing it for 10 minutes at an extrusion temperature of 200-220° C. and a rotation speed of 500-800 rpm, and after mixing evenly, extruding, drawing, air cooling, pelletizing and drying processes are performed to obtain a high-elasticity, low-smoke, halogen-free flame-retardant olefin cable material.

[0049] Example 6

[0050] A method for preparing a high-elasticity, low-smoke, halogen-free, flame-retardant olefin cable material comprises the following steps:

[0051] 1) Weigh 50 parts of ethylene-vinyl acetate copolymer, 60 parts of high-density polyethylene and 15 parts of low-density polyethylene and mix them thoroughly to obtain a mixture;

[0052] 2) adding 2.5 parts of silane coupling agent, 47.5 parts of magnesium hydroxide, 47.5 parts of aluminum hydroxide, 1.5 parts of antioxidant, 40 parts of ethylene-propylene copolymer and 8 parts of softener to the mixture, mixing well and then kneading to obtain a kneaded mixture;

[0053] 3) placing the kneaded mixture in a twin-screw extruder, mixing it for 10 minutes at an extrusion temperature of 200-220° C. and a rotation speed of 500-800 rpm, and after mixing evenly, extruding, drawing, air cooling, pelletizing and drying processes are performed to obtain a high-elasticity, low-smoke, halogen-free flame-retardant olefin cable material.

[0054] Example 7

[0055] A method for preparing a high-elasticity, low-smoke, halogen-free, flame-retardant olefin cable material comprises the following steps:

[0056] 1) Weigh 50 parts of ethylene-vinyl acetate copolymer, 60 parts of high-density polyethylene and 15 parts of low-density polyethylene and mix them thoroughly to obtain a mixture;

[0057] 2) adding 2.5 parts of silane coupling agent, 47.5 parts of magnesium hydroxide, 47.5 parts of aluminum hydroxide, 1.5 parts of antioxidant, 30 parts of EPDM rubber and 9 parts of softener to the mixture, mixing well and then kneading to obtain a kneaded mixture;

[0058] 3) placing the kneaded mixture in a twin-screw extruder, mixing it for 10 minutes at an extrusion temperature of 200-220° C. and a rotation speed of 500-800 rpm, and after mixing evenly, extruding, drawing, air cooling, pelletizing and drying processes are performed to obtain a high-elasticity, low-smoke, halogen-free flame-retardant olefin cable material.

[0059] Example 8

[0060] A method for preparing a high-elasticity, low-smoke, halogen-free, flame-retardant olefin cable material comprises the following steps:

[0061] 1) Weigh 50 parts of ethylene-vinyl acetate copolymer, 60 parts of high-density polyethylene and 15 parts of low-density polyethylene and mix them thoroughly to obtain a mixture;

[0062] 2) adding 2.5 parts of silane coupling agent, 47.5 parts of magnesium hydroxide, 47.5 parts of aluminum hydroxide, 1.5 parts of antioxidant, 20 parts of ethylene-propylene copolymer, 20 parts of ethylene-propylene rubber and 9 parts of softener to the mixture, mixing well and then kneading to obtain a kneaded mixture;

[0063] 3) placing the kneaded mixture in a twin-screw extruder, mixing it for 10 minutes at an extrusion temperature of 200-220° C. and a rotation speed of 500-800 rpm, and after mixing evenly, extruding, drawing, air cooling, pelletizing and drying processes are performed to obtain a high-elasticity, low-smoke, halogen-free flame-retardant olefin cable material.

[0064] Table 1 Material ratio data table of Examples 1 to 8

[0065]

[0066]

[0067] Comparative Example 1

[0068] 1) Weigh 50 parts of ethylene-vinyl acetate copolymer, 60 parts of high-density polyethylene and 15 parts of low-density polyethylene and mix them thoroughly to obtain a mixture;

[0069] 2) adding 2.5 parts of silane coupling agent, 47.5 parts of magnesium hydroxide, 47.5 parts of aluminum hydroxide, 1.5 parts of antioxidant and 9 parts of softener to the mixture, mixing well and then kneading to obtain a kneaded mixture;

[0070] 3) placing the kneaded mixture in a twin-screw extruder, mixing it for 10 minutes at an extrusion temperature of 200-220° C. and a rotation speed of 500-800 rpm, and after mixing evenly, extruding, drawing, air cooling, pelletizing and drying processes are performed to obtain a high-elasticity, low-smoke, halogen-free flame-retardant olefin cable material.

[0071] The cable materials obtained in the above Examples 1-8 and Comparative Example 1 were tested for density (GB1033), hardness A (GB / T531-1999), tensile strength (GB / T1040.2-2022), elongation at break (GB / T1040.2-2022), aging resistance (GB / T2951.2-2008), smoke density (GB8323.2-2008), flame retardancy (UL1581), moisture resistance (JB / T8138.6-1995), and thermal shock test (GB / t2951.31), and the specific data are shown in Table 2.

[0072] Table 2 Performance test results data table

[0073]

[0074]

[0075] According to the data in Table 2 above, the high elasticity, low smoke, halogen-free, flame-retardant olefin cable prepared in the present application has excellent tensile strength, toughness, flame retardant properties and thermal shock properties.

[0076] Comparison between Example 1 and Comparative Example 1 shows that the elastomer used in Example 1 has better tensile strength and toughness for the cable.

[0077] From the comparison between Example 1 and Examples 7-8, it can be seen that the use of different elastomers has different effects on the tensile strength. When ethylene-propylene copolymer and EPDM rubber elastomer are used in combination, the overall performance of the cable is better. The combination of ethylene-propylene copolymer and EPDM rubber can improve the toughness of the cable.

[0078] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A high elasticity, low smoke, halogen-free, flame retardant olefin cable material, characterized by: The invention is prepared from the following raw materials in parts by weight: 40-60 parts of ethylene-vinyl acetate copolymer, 50-70 parts of high-density polyethylene, 15-20 parts of low-density polyethylene, 2-5 parts of silane coupling agent, 90-120 parts of flame retardant, 1-2 parts of antioxidant, 20-40 parts of polyolefin elastomer and 5-10 parts of softener.

2. The high elasticity, low smoke, halogen-free, flame retardant olefin cable material according to claim 1, characterized in that: The invention is prepared from the following raw materials in parts by weight: 50-60 parts of ethylene-vinyl acetate copolymer, 50-65 parts of high-density polyethylene, 15-18 parts of low-density polyethylene, 2-3 parts of silane coupling agent, 90-100 parts of flame retardant, 1-1.5 parts of antioxidant, 25-40 parts of polyolefin elastomer and 8-10 parts of softener.

3. The high elasticity, low smoke, halogen-free, flame retardant olefin cable material according to claim 1, characterized in that: The flame retardant is selected from one or both of aluminum hydroxide and magnesium hydroxide.

4. The high elasticity, low smoke, halogen-free, flame retardant olefin cable material according to claim 1, characterized in that: The antioxidant is phenol.

5. The high elasticity, low smoke, halogen-free, flame retardant olefin cable material according to claim 1, characterized in that: The softener is polyethylene wax.

6. The high elasticity, low smoke, halogen-free, flame retardant olefin cable material according to claim 1, characterized in that: The polyolefin elastomer is selected from ethylene-propylene copolymer, ethylene-propylene-diene rubber or a mixture of the two or more thereof.

7. The high elasticity, low smoke, halogen-free, flame retardant olefin cable material according to any one of claims 1 to 6, characterized in that: The following steps are involved: 1) Weighing ethylene-vinyl acetate copolymer, high-density polyethylene and low-density polyethylene according to a certain proportion and mixing them thoroughly to obtain a mixture; 2) adding a silane coupling agent, a flame retardant, an antioxidant, a polyolefin elastomer POE and a softener to the mixture, mixing them evenly and then kneading them to obtain a kneaded mixture; 3) The kneaded mixture is added into a twin-screw extruder and subjected to the processes of extrusion, drawing, air cooling, pelletizing and drying to obtain a high-elasticity, low-smoke, halogen-free flame-retardant olefin cable material.

8. The high elasticity, low smoke, halogen-free, flame retardant olefin cable material according to claim 7, characterized in that: The mixing temperature in step 2) is 80-100°C.

9. The high elasticity, low smoke, halogen-free, flame retardant olefin cable material according to claim 7, characterized in that: The extrusion temperature of the twin-screw extruder in step 3) is 200-220°C.

10. The high elasticity, low smoke, halogen-free, flame retardant olefin cable material according to claim 7, characterized in that: In the step 3), the rotation speed of the twin-screw extruder is 500-800 rpm.

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