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Ultra-high molecular weight polyethylene continuous water washing device and method

A technology of ultra-high molecular weight and washing equipment, which is applied in the field of continuous washing equipment for ultra-high molecular weight polyethylene, which can solve problems such as difficulties, large energy consumption, and stability impact, and achieve the effect of increasing added value

Active Publication Date: 2019-12-27
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This approach has considerable disadvantages
First of all, this method is an intermittent operation method, which cannot continuously feed and discharge materials. The direct consequence is that there is a certain gap in the washing effect between each kettle.
Therefore, it is easy to cause fluctuations in product quality
This not only affects the stability of the subsequent processing equipment, but also affects the stability of product quality
In addition, because ultra-high molecular weight polyethylene is non-polar, and the polarity of water is very different, it is very difficult to fully mix the two through stirring to complete washing, and a very high stirring speed is required, which requires a lot of water. large energy consumption

Method used

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  • Ultra-high molecular weight polyethylene continuous water washing device and method
  • Ultra-high molecular weight polyethylene continuous water washing device and method
  • Ultra-high molecular weight polyethylene continuous water washing device and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Preparation of ultra-high molecular weight polyethylene powder:

[0030] Add 600 liters of hexane oil into a stainless steel reactor with a volume of 1 cubic meter, stir and heat up to 70°C, add 50 g of aluminum alkyl, add 5 g of catalyst after 10 minutes, and feed ethylene after 10 minutes and keep the pressure at 0.7-0.9 MPa During the period, the polymerization temperature was controlled at 75°C, and the material was discharged after 5 hours of polymerization. Filter the polymer feed solution to separate the solvent, wash once with hexane oil, the mass ratio of polymer to solvent is 1:1 during solvent washing, and wash with solvent for 20 minutes, after filtering and separating, heat and dry under vacuum at a temperature of 60-80°C , taking no more solvent as the drying end point to obtain 290kg of product.

[0031] The mixing ratio of water and polyethylene powder is 1:6, and the water temperature is 60°C, and the prepared ultra-high molecular weight polyethylene p...

Embodiment 2

[0037]The preparation of ultra-high molecular weight polyethylene powder and the continuous water washing device used are the same as in Example 1, the only difference is that the mixing ratio of water and polyethylene powder is 1:6, and the water temperature is 50°C. The ultra-high molecular weight polyethylene powder is washed with water.

Embodiment 3

[0039] The preparation of ultra-high molecular weight polyethylene powder and the continuous water washing device used are the same as in Example 1, the only difference is that the mixing ratio of water and polyethylene powder is 1:6, and the water temperature is 70°C. The ultra-high molecular weight polyethylene powder is washed with water.

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Abstract

The invention belongs to the technical field of macromolecular chemical engineering, and particularly relates to a continuous washing device and method for polyethylene with an ultrahigh molecular weight. The continuous washing device comprises a jet mixer, wherein a washing material outlet of the jet mixer is connected with an inlet of a buffer tank; an outlet of the buffer tank is connected witha centrifugal machine; the centrifugal machine is connected with a dryer and a hot water tank; the hot water tank is connected with a material inlet of the jet mixer. The jet mixer comprises the material inlet; the material inlet and the washing material outlet are respectively located at two ends of a mixing chamber; a nozzle is arranged inside the mixing chamber; a material inlet is formed in the wall, which is located between the nozzle and the washing material outlet, of the mixing chamber. The continuous washing method comprises the step of washing polyethylene powder with water according to a mass ratio of 1:(2-30) at water temperature of 10 to 100 DEG C. The jet mixer is used as washing equipment; by adjustment of the water temperature and the ratio of the water to the powder, thewater and the powder can be fully mixed; after the powder is washed, the performance of the powder is equivalent to that of kettle type washed powder; furthermore, a breakthrough from an intermittentmode to a continuous mode is achieved, and the quality stability of the powder is improved.

Description

technical field [0001] The invention belongs to the technical field of polymer chemical industry, and in particular relates to a continuous water washing device and method for ultra-high molecular weight polyethylene. Background technique [0002] Ultra-high molecular weight polyethylene (UHMWPE) is a thermoplastic engineering plastic with a molecular weight of more than 1.5 million. Ultra-high molecular weight polyethylene has excellent wear resistance (abrasion resistance is 8 times that of steel and 4 times that of nylon), low temperature resistance (not brittle in liquid nitrogen), self-lubrication (friction coefficient 0.07-0.11), Corrosion resistance (resistance to various corrosive liquids and various organic solvents), impact resistance (impact strength is twice that of polycarbonate). Due to the above excellent properties, it is widely used in mining, metallurgy, electric power, textile, petroleum, paper making, food, machinery, electronics, sports, military indust...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F6/00C08F110/02
CPCC08F6/00C08F110/02
Inventor 苏建华肖恩琳徐永森李静周建勇孙丽朋王秀丽
Owner CHINA PETROLEUM & CHEM CORP
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