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A kind of cross-linked polyethylene and its preparation method and application

A technology of cross-linked polyethylene and polyethylene, which is applied in the field of cross-linked polyethylene and its preparation, can solve problems such as unrecyclable processing, expensive equipment, and environmental pollution, so as to improve physical and mechanical properties, improve mechanical properties, and reduce environmental pollution. pollution effect

Active Publication Date: 2021-10-29
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, people use methods such as radiation crosslinking, silane crosslinking, and chemical crosslinking to form a crosslinked network structure between polyethylene molecular chains to solve this problem. , electron beam) has strong radiation, expensive equipment, high cost, and an irreversible network structure is formed in all cross-linking processes, and its products cannot be recycled after destruction, causing a lot of environmental pollution and resources. waste

Method used

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  • A kind of cross-linked polyethylene and its preparation method and application
  • A kind of cross-linked polyethylene and its preparation method and application
  • A kind of cross-linked polyethylene and its preparation method and application

Examples

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preparation example 1

[0056] Preparation Example 1: The preparation of furyl-modified polyethylene specifically includes the following steps:

[0057] In the low-pressure, medium-pressure and high-pressure process of the slurry method, gas phase method or solution method of polyethylene production, ethylene and vinyl furan are added at the same time for polymerization to obtain furan-based copolymerized polyethylene; or the initiator (DCP or BPO ), polyethylene, vinyl furan, stabilizer, etc. are added to the twin-screw extruder together, and polyethylene and vinyl furan monomers generate active free radicals under the action of the initiator, so that furan groups are grafted to polyethylene molecules on the chain to obtain furyl grafted polyethylene;

[0058] Described vinyl furan includes 2-vinyl furan, 2-(2-nitrovinyl) furan, 5-(2-methoxycarbonyl vinyl furan)-2 carboxymethyl ester, [5-[2- (5-methylfuran-2-yl)vinyl]furan-2-yl]methanol and its derivatives; the polyethylene includes but not high-de...

preparation example 2

[0059] Preparation example 2: the preparation method of bismaleimide crosslinking agent specifically comprises:

[0060] a1. Add maleic anhydride and furan monomers in equimolar amounts to a polar aprotic solvent, and react for 4 to 20 hours at 20 to 90° C., the molar equivalent ratio of maleic anhydride to the polar aprotic solvent is 1:1~1:1000; the polar aprotic solvent includes one of DMF, NMP, DMSO, and DMAC;

[0061] b1. Add 0.5 molar equivalent of diamine monomer into the above-mentioned polar aprotic solvent, and add it dropwise into the above-mentioned solution through a peristaltic pump, and stir the mixed solution at 50-90°C for 6-24 hours; wherein diamine and polar The molar equivalent ratio of the solvent is 1:1~1:1000;

[0062] c1. Add 0.1-10.0 molar equivalents of acetic anhydride, 0.005-1.0 millimole equivalents of sodium acetate, and 0.005-1.0 molar equivalents of triethylamine, and continue the reaction for 3-12 hours;

[0063] d1. The mixture is dried by r...

preparation example 3

[0065] Preparation Example 3: The preparation method of maleimide-modified POSS nanoparticles (n=2~8) specifically includes:

[0066] a2, 8~10 molar equivalents of maleic anhydride are dissolved in an appropriate amount of methanol to form a homogeneous solution;

[0067] b2, 1 molar equivalent of POSS hydrochloride and 0.1 to 1.0 molar equivalent of triethylamine are dissolved in an appropriate amount of methanol, and added dropwise to the above-mentioned filtrate;

[0068] c2. Continue to stir at 25-60°C for 3-24 hours after the dropwise addition, filter and dry to obtain a white powder;

[0069] d2. Add 0.7 millimole equivalents of the above powder, 0.001-1.0 molar equivalents of acetic anhydride, 0.005-0.1 molar equivalents of sodium acetate, and 0.005-0.1 molar equivalents of triethylamine into 0.1-10.0 molar equivalents of DMF, 60 React at ~150°C for 6-24 hours, remove the solvent by rotary evaporation, wash the product 3-5 times, and dry to obtain maleimide-modified PO...

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Abstract

The invention provides a cross-linked polyethylene and its preparation method and application, and relates to the technical field of modification and processing of polyethylene. The cross-linking modification and recycling processing of polyethylene are realized through the reversibility and cyclicity of Diels-Alder reaction between furan-modified polyethylene and organic cross-linking agent, hybrid cross-linking agent or inorganic cross-linking agent, respectively. The preparation method of the novel recyclable cross-linked polyethylene of the invention is simple, the raw material is cheap, the physical properties of the cross-linked polyethylene are greatly improved, and the resistance to environmental stress cracking, corrosion resistance, weather resistance, creep resistance and the like are significantly improved. The cross-linked waste can be de-crosslinked through twin-screw melt processing to achieve reverse Diels-Alder reaction to achieve recycling, reducing environmental pollution and resource waste, and endowing it with the performance of recycling while improving the performance of polyethylene.

Description

technical field [0001] The invention relates to the technical field of modification and processing of polyethylene, in particular to a cross-linked polyethylene and its preparation method and application. Background technique [0002] Polyethylene (PE) is a crystalline long-chain linear or branched chain polymer polymerized from ethylene monomers. As one of the five major synthetic resins, it is the most productive and most imported variety of synthetic resins in my country. It has the advantages of corrosion resistance, low temperature resistance, good electrical insulation, high crystallinity, low moisture absorption, good fluidity, non-toxic and tasteless, so it is widely used in plastic wrap, plastic bags, baby bottles, kettles, wires and cables, pipes, profiles various fields of the national economy. [0003] However, the special flexible molecular chain of polyethylene leads to its defects such as poor mechanical properties, easy creep, poor wear resistance, poor resi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F8/30C08F210/02C08F224/00C08F255/02C08G81/02C08G77/442C08L23/08C08L51/06C08K3/04
CPCC08F8/30C08G77/442C08G81/024C08K2201/011C08L2201/08C08L2201/12C08L2203/16C08L2203/18C08L2203/202C08K3/041C08F210/02C08F224/00C08F255/02C08L51/06C08L23/0846
Inventor 朱新远罗开举童刚生熊书强何紫东汪根林祝瑞华
Owner SHANGHAI JIAOTONG UNIV
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