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Halogen-free high-flame-retardant polyolefin sheath material and preparation method thereof

A polyolefin sheath, high flame-retardant technology, applied in the direction of fiber mechanical structure, etc., can solve the problems of unqualified optical fiber signal attenuation, cracking of optical cable sheath, high smoke density, etc., to avoid abrasion or even scratches, and improve laying Efficiency, the effect of increasing capacity

Pending Publication Date: 2022-06-24
中广核拓普(湖北)新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, there are several defects in the halogen-free high flame-retardant polyolefin sheath material of the related art: 1. The addition of a large amount of inorganic flame retardants greatly reduces the mechanical properties and crack resistance of the sheath material, resulting in a butterfly-shaped After the optical cable has passed the high and low temperature cycle test, the cable suspension wire and the subunit are prone to cracking, and the sheath is deformed, resulting in unqualified fiber signal attenuation; 2. The friction coefficient of the optical cable sheath material is too large to meet the requirements; 3. The carbonization of ordinary materials is poor when burned , poor self-extinguishing property, high density of smoke generated by combustion, and bundled combustion cannot meet the requirements; 4. When applied to a three-unit glue-coated large steel wire structure, when the crack resistance of the sheath material cannot meet the requirements, the excessive stress of the steel wire will easily cause the cable sheath cracking

Method used

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  • Halogen-free high-flame-retardant polyolefin sheath material and preparation method thereof
  • Halogen-free high-flame-retardant polyolefin sheath material and preparation method thereof
  • Halogen-free high-flame-retardant polyolefin sheath material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] S1: In parts by weight, 30 parts of ethylene-vinyl acetate copolymer with a VA content of 18 wt %, 5 parts of POE resin, 50 parts of high density polyethylene (HDPE resin 1, Dushanzi 6098), 15 parts of Malay Acid anhydride graft compatibilizer, 150 parts aluminum hydroxide, 10 parts melamine urate flame retardant, 1.5 parts antioxidant (1010, DLTP, 300 proportions are 0.27wt%, 0.22wt%, 0.18wt%, respectively), 1.2 parts of lubricant polyethylene wax, 1.5 parts of silane coupling agent, 6 parts of surface slip agent amide type slip agent + fluorine-containing rheological agent + ultra-high molecular weight siloxane, 3 parts of carbon black were put into the pressurized type in turn. Pre-mixed in an internal mixer to obtain uniformly mixed materials;

[0037] S2: Press the pre-mixed material of S1 for 14-16min, the pressure is 0.55-0.65MPa, and the mixing temperature needs to reach 160-165℃ to obtain the dough after mixing;

[0038] S3: Enter the dough after S2 banburying...

Embodiment 2-6

[0042] Examples 2-6 are basically the same as Example 1, the only difference is that each component and the ratio of each component are different, and the ratio of each component and each component in Examples 2-6 is shown in Table 1.

[0043] Table 1 embodiment 2-6 each component and its proportioning

[0044]

[0045] HDPE resin 1: Dushanzi 6098; HDPE resin 2: produced by Dow Company, the melt index measured by GB / T 3682-2000 method is 0.4-1.0g / 10min, and the tensile strength measured by GB 1040 method is 30-35MPa, Elongation at break 700-900%.

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Abstract

The invention discloses a halogen-free high-flame-retardant polyolefin sheath material and a preparation method of the halogen-free high-flame-retardant polyolefin sheath material. The halogen-free high-flame-retardant polyolefin sheath material comprises 40-60 parts of an ethylene-vinyl acetate copolymer with the VA content of 28 wt%, 20-30 parts of bimodal polyethylene resin, 3-10 parts of high-density polyethylene resin, 12-20 parts of a maleic anhydride grafted polyolefin copolymer, 140-180 parts of an inorganic halogen-free flame retardant, 5-15 parts of a nitrogen flame retardant, 5-15 parts of a phosphorus flame retardant, 1-2 parts of a lubricant and 1-1.5 parts of an antioxidant. 1-2 parts of a silane coupling agent, 5-10 parts of a surface slipping agent and 2-4 parts of carbon black powder. In addition, the invention also discloses a preparation method of the halogen-free high-flame-retardant polyolefin sheath material.

Description

technical field [0001] The present invention relates to a polyethylene sheathing material, more particularly, the present invention relates to a halogen-free high flame-retardant polyolefin sheathing material and a preparation method thereof. Background technique [0002] Butterfly optical cable has the advantages of small outer diameter, light weight, low cost, good bending performance, light and easy laying, low construction cost and fast speed, so it is widely used in smart buildings, digital communities, smart campus networks and local area networks. With the rapid development of information construction, the usage of butterfly optical cables has increased significantly. Butterfly optical cables are generally laid in tubes or in bundles. The lower surface friction coefficient can reduce the frictional resistance on the surface of the optical cable and effectively improve the laying efficiency. At the same time, to a large extent, the surface of the optical cable is preve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/08C08L23/06C08L51/06C08K3/22C08K5/3492C08K3/32G02B6/44
CPCC08L23/0853C08L23/06G02B6/44C08L2201/02C08L2201/22C08L2207/062C08K2003/2227C08L23/0815C08L51/06C08K3/22C08K5/34928C08K3/32
Inventor 陈文演程金星
Owner 中广核拓普(湖北)新材料有限公司