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High-temperature-resistant formaldehyde-removing polyethylene and preparation method thereof

A technology of high temperature resistant and polyethylene, applied in the field of high temperature resistant formaldehyde removal polyethylene and its preparation, can solve the problems of reducing the electrical properties of cross-linked polyethylene, improve mechanical properties and heat resistance, wide application, good removal The effect of formaldehyde

Inactive Publication Date: 2021-01-29
杨勇强
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the industry, dicumyl peroxide (DCP) is used to break the bond between oxygen atoms at high temperature to form free radicals, the H atoms on the polyethylene chain are replaced with free radicals, and the free radicals of different polyethylene molecules are bonded to form cross-linking points , but it will produce cross-linked by-products such as acetophenone, cumyl alcohol and methane, which reduces the electrical properties of cross-linked polyethylene, and usually requires post-treatment to remove by-products

Method used

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  • High-temperature-resistant formaldehyde-removing polyethylene and preparation method thereof
  • High-temperature-resistant formaldehyde-removing polyethylene and preparation method thereof
  • High-temperature-resistant formaldehyde-removing polyethylene and preparation method thereof

Examples

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Effect test

preparation example 1

[0030] Titanium dioxide hollow spheres of preparation example 1 loaded catalyst

[0031] Prepared by:

[0032] S1. Dissolve 15g of tetrabutyl titanate in 100mL of dichloromethane, add 1g of titanate coupling agent TMC-311, stir and mix evenly to obtain an oil phase;

[0033] S2. Dissolving 10 g of surfactant sodium stearate and 1 g of porogen polyethylene glycol octylphenyl ether in 100 mL of water to obtain an aqueous phase;

[0034] S3. After mixing 10 g of the oil phase and 30 g of the water phase, homogenize at 10,000 r / min for 2 minutes to obtain an emulsion, react for 1 hour to obtain a porous titanium dioxide hollow sphere emulsion, filter and dry to obtain a dry powder of porous titanium dioxide hollow spheres;

[0035] S4. Dissolve 2g of palladium-carbon catalyst in 50mL of dichloromethane, add 100g of dry powder of porous titanium dioxide hollow spheres, soak for 3h, suction filter, and dry to obtain catalyst-loaded titanium dioxide hollow spheres.

preparation example 2

[0036] Titanium dioxide hollow spheres of preparation example 2 loaded catalyst

[0037] Prepared by:

[0038] S1. Dissolve 15g of tetrabutyl titanate in 100mL of ethyl acetate, add 2g of titanate coupling agent TMC-2, stir and mix evenly to obtain an oil phase;

[0039] S2. Dissolving 10 g of surfactant sodium dodecyl sulfonate and 5 g of porogen polyethylene glycol octylphenyl ether in 100 mL of water to obtain an aqueous phase;

[0040] S3. After mixing 10 g of the oil phase and 50 g of the water phase, homogenize at 10,000 r / min for 2 minutes to obtain an emulsion, react for 3 hours to obtain a porous titanium dioxide hollow sphere emulsion, filter and dry to obtain a dry powder of porous titanium dioxide hollow spheres;

[0041] S4. Dissolve 5g palladium carbon catalyst in 50mL ethyl acetate, add the dry powder of 100g porous titanium dioxide hollow spheres, soak for 5h, suction filter, dry, obtain the titanium dioxide hollow spheres of loaded catalyst, its SEM figure se...

Embodiment 1

[0043] Composition of raw materials (parts by weight): 10 parts of titanium dioxide hollow spheres loaded with catalyst, 100 parts of ethylene, 200 parts of tetrahydrofuran, 1 part of stabilizer zinc stearate, 1 part of plasticizer di-sec-octyl phthalate, toughener 0.5 parts of polyimide and 0.1-0.5 parts of antioxidant p-phenylenediamine.

[0044] Include the following steps:

[0045] S1. Pass ethylene into tetrahydrofuran, after absorbing saturation, add titanium dioxide hollow spheres loaded with catalyst, react at 50°C for 2 hours, add hydrochloric acid / ethanol mixed solution (HCl content is 20-35wt%) to terminate the reaction, and the obtained polymer After washing with tetrahydrofuran, drying to obtain a polyethylene resin containing titanium dioxide hollow spheres;

[0046] S2. Add polyethylene resin containing titanium dioxide hollow spheres, stabilizer zinc stearate, plasticizer dioctyl phthalate, toughening agent polyimide and antioxidant p-phenylenediamine to the t...

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Abstract

The invention provides high-temperature-resistant formaldehyde-removing polyethylene which is prepared from the following raw materials: catalyst-loaded titanium dioxide hollow spheres, ethylene, tetrahydrofuran, a stabilizer, a plasticizer, a flexibilizer and an antioxidant. Porous titanium dioxide hollow spheres are prepared, a palladium-carbon catalyst is loaded, ethylene polymerization is further catalyzed, polyethylene molecular chains pass through the hollow spheres and physical crosslinking is better achieved so that the mechanical property and heat resistance of the polyethylene material are effectively improved, the polyethylene chains do not need to be chemically modified, generation of by-products is avoided, meanwhile, the titanium dioxide hollow spheres can well degrade formaldehyde, purify air, sterilize and inhibit bacteria, the industrial preparation method is simple, and the application range is wider.

Description

technical field [0001] The invention relates to the technical field of polyethylene, in particular to a high-temperature-resistant formaldehyde-removing polyethylene and a preparation method thereof. Background technique [0002] Polyethylene is the simplest polymer in the polyolefin family structure, and the monomer is -CH 2 -CH 2 -, the degree of polymerization can reach hundreds of thousands, and it is a long-chain thermoplastic hydrocarbon molecular structure. In addition to the main chain of polyethylene, there are side chains, and the parameters of the side chains will affect the density, cleanliness and mechanical properties of polyethylene. When heated and stressed, polyethylene molecular chains tend to slide, so polyethylene has weak thermal deformation resistance, poor environmental stress cracking resistance, and low working temperature. In thermoplastic state, the maximum working temperature is 75°C. The cross-linking agent is used to cross-link polyethylene m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08L79/08C08L13/00C08L81/04C08L83/04C08K13/04C08K7/24C08K5/098C08K5/12
CPCC08L23/06C08L2201/08C08L2312/00C08L79/08C08K13/04C08K7/24C08K5/098C08K5/12C08L13/00C08L81/04C08L83/04
Inventor 不公告发明人
Owner 杨勇强
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