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Preparation method of ultrahigh molecular weight polyethylene composite material

A low-molecular-weight polyethylene and ultra-high-molecular-weight technology, which is applied in the field of preparation of ultra-high-molecular-weight polyethylene composite materials, can solve problems such as poor uniformity of blended products, decreased mechanical properties, difficult untangle and dispersion, and achieve compensatory performance The effect of reducing, improving processing performance, balancing processing performance and use performance

Inactive Publication Date: 2013-07-10
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, on the one hand, the molecular weight of the blend cannot be maintained high enough after being mixed with low molecular weight polyethylene, resulting in a decrease in mechanical properties; on the other hand, it is difficult to achieve ultra-long molecular chains in ordinary polyolefins by mechanical blending. Good disentanglement and dispersion, very poor uniformity of blended products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The reactor used in this example is a slurry polymerization reactor.

[0027] The reaction device was purged with high-purity nitrogen to remove air and water in the reaction device. 100ml toluene, 10ml concentration is 3.5×10 -4 The mol / l catalyst (A) toluene solution of diimide palladium catalyst and 5 g of POSS molecules with hydroxyl group and acrylate isobutyl group were added to the device, stirred for 4 hours, and then sent into the reactor. Set the temperature of the reactor at 20°C, the pressure at 30 bar, feed ethylene, stop the reaction after 20 minutes of polymerization, take a sample and analyze the resulting polyethylene with a branching degree of 340 / 1000C, a molecular weight of 10,234, a molecular weight distribution of 1.34, and POSS molecules at the end. Further add 100ml concentration to the reactor to be 3.5×10 -4 mol / l FI catalyst (titanium pyrrole imide catalyst) [3-t-Bu-2-O-C 6 h 3 CHdN(C 6 f 5 )] 2 TiCl 2 The toluene solution was stirred ...

Embodiment 2

[0029] The polymerization reactor was heated to 40°C and the pressure was 10 bar, and 5ml of trimethylaluminoxane (MAO), ethylene and 2ml of ethylene were added successively with a concentration of 3.5×10 -4 mol / l FI catalyst (titanium pyrrole imide catalyst) [3-t-Bu-2-O-C 6 h 3 CHdN(C 6 f 5 )] 2 TiCl 2 solution in toluene to start the polymerization reaction. After 30 minutes of polymerization, the reaction was stopped, and the obtained molecular weight was 4.255 million, the molecular weight distribution was 2.12, the product tensile strength was 55 g / d, and the melt viscosity was 45 g / d.

[0030] Others are as in Example 1.

Embodiment 3

[0032] The reaction device was purged with high-purity nitrogen to remove air and water in the reaction device. 100ml toluene, 10ml concentration is 3.5×10 -4 The mol / l catalyst (A) toluene solution of diimide palladium catalyst and 5 g of POSS molecules with hydroxyl group and acrylate isobutyl group were added to the device, stirred for 4 hours, and then sent into the reactor. Set the temperature of the reactor at 20°C, the pressure at 30 bar, feed ethylene, stop the reaction after 20 minutes of polymerization, take a sample and analyze the resulting polyethylene with a branching degree of 340 / 1000C, a molecular weight of 10,234, a molecular weight distribution of 1.34, and POSS molecules at the end. Further add 100ml concentration to the reactor to be 3.5×10 -4 mol / l catalyst TiCl 3 The toluene solution was stirred at 60°C for 4 hours, and the solvent was drained to obtain Catalyst B. The polymerization reactor was heated to 60°C and the pressure was 20 bar, and 5ml of t...

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Abstract

The invention relates to a preparation method of a polyethylene composite material with ultrahigh molecular weight. The method is characterized by comprising the steps of: selecting two olefin polymerization catalysts, wherein one is an ultra-high molecular weight polyethylene catalyst capable of producing ultrahigh molecular weight polyethylene, and the other is a low molecular weight catalyst capable of producing low molecular weight polyethylene; using POSS molecules with hydroxyl and acrylate isobutyl on the surfaces as carriers, loading the low molecular weight catalyst on the POSS molecules, and conducting a polymerization reaction to obtain low molecular weight polyethylene; and then loading the ultrahigh molecular weight polyethylene catalyst on the POSS molecules, adding a cocatalyst, introducing ethylene, and conducting a polymerization reaction to obtain an ultrahigh molecular weight / POSS / low molecular polyethylene blended nano composite material. The preparation method provided by the invention has advantages of simple process, high efficiency and low energy consumption, and can prepare UHMWPE / low molecular weight polyethylene / POSS nano composite material with uniformly mixed molecular scale by in situ polymerization.

Description

technical field [0001] The invention relates to a preparation method of ultra-high molecular weight polyethylene composite material. Background technique [0002] Ultra-high molecular weight polyethylene (UHMWPE) refers to high-density polyethylene with a molecular weight of more than 1.5 million. It has unparalleled impact resistance, wear resistance, self-lubrication, and chemical corrosion resistance. fields such as machinery and transportation. The ultra-long molecular chain and a small amount of branching can ensure the regular folding of the crystal region, forming a crystal lattice with a thickness of about 10-50nm and a length of 10-50μm, so that the material has excellent mechanical properties. For ultra-high molecular weight polyethylene, the ultra-long molecular chain and a large number of chain-entangled structures make its melt viscosity extremely high, and processing is very difficult. [0003] In order to improve the processing performance of ultra-high mole...

Claims

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Application Information

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IPC IPC(8): C08F110/02C08F4/02C08L23/06
Inventor 陈忠仁历伟侯琳熙穆景山
Owner NINGBO UNIV
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