Modified ultra-high molecular weight polyethylene (UHMWPE) and application thereof on centrifugal pump

An ultra-high molecular weight, high-volume polyethylene technology, applied in the field of modified ultra-high molecular weight polyethylene, can solve the problems of wear resistance, performance degradation, and increased production processes.

Inactive Publication Date: 2010-10-13
宜兴市宙斯泵业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the UHMWPE composition disclosed in Chinese patent CN1091758, 5 to 25% of inorganic fibers are added to UHMWPE with a molecular weight (measured by viscosity method) of more than 3 million, so that the heat distortion temperature of the modified material is increased by about 20°C, and the breaking strength of the material is improved. The coefficient of thermal expansion is reduced, but the wear resistance is basically not significantly improved; while adding inorganic fiber modification, the modification process is complicated, the production process increases, and the secondary heating of the modification can easily lead to the degradation of the material

Method used

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  • Modified ultra-high molecular weight polyethylene (UHMWPE) and application thereof on centrifugal pump
  • Modified ultra-high molecular weight polyethylene (UHMWPE) and application thereof on centrifugal pump
  • Modified ultra-high molecular weight polyethylene (UHMWPE) and application thereof on centrifugal pump

Examples

Experimental program
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Embodiment 1

[0023] Embodiment 1: 95wt% of the commercially available molecular weight 5,000,000 40 order ultra-high molecular weight polyethylene is pulverized into 80 order fine powder, adds 5wt% potassium hexacarbonate whisker (average diameter 3 μm) through use temperature 180 ℃ of silane coupling agents , aspect ratio 10-30), mixed in a low-speed mixer for 5-15 minutes to obtain modified ultra-high molecular weight polyethylene powder. Potassium hexacarbonate whisker coupling treatment, with γ-aminopropyltriethoxysilane coupling agent (KH-550) of whisker weight 1-2wt%, by diluting with ethanol 1:50 times, spray on whisker , mix, and dry to get the potassium hexacarbonate whisker that coupling agent handles (also can adopt dilute coupling agent to soak processing). ;

[0024] Put the obtained modified UHMWPE powder into the outer mold of the metal volute of the centrifugal pump according to the usual lining molding method, and heat the belt mold until the mold temperature is 240-280°C...

Embodiment 2

[0025] Example 2: As in Example 1, wherein the UHMWPE has a molecular weight of 4 million and a fineness of 60 meshes. Take 3wt% silicone oil (based on the weight of UHMWPE) and add 1-5 times of ethanol to dilute it. Put the UHMWPE into a high-speed 6000-10000 rpm In the mixer, add diluted silicone oil while stirring, stir evenly, and dry; add 7wt% potassium hexacarbonate whiskers (coupling agent treatment is the same as above), and put the two into a low-speed mixer and mix for 5-10 minutes. The methods of the molded pump volute and the all-plastic pump volute are basically the same as those of the prior art, except that the constant temperature time is shortened.

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Abstract

The invention relates to a modified ultra-high molecular weight polyethylene (UHMWPE) that is characterized by being prepared by mixing 85 to 98 wt% of ultra-high molecular weight polyethylene with the molecular weight (measured by viscosimetry) of 1.5 to 5 millions and 2 to 15 wt% of potassium carbonate whisker processed by a coupling agent. The invention not only greatly improves the abrasion resistance of the UHMWPE, but also has the comprehensive effects of raising of use temperature, reduction of coefficient of thermal expansion and improvement of melting performance, processing and molding performance, production efficiency and product quality; and in particular, the invention is suitable for anti-corrosive and wear-resisting centrifugal pumps.

Description

technical field [0001] The invention relates to a modified ultra-high molecular weight polyethylene, especially the ultra-high molecular weight polyethylene modified with potassium carbonate whiskers to obtain ultra-high molecular weight polyethylene with good impact and wear resistance and processability, and has the advantages of corrosion resistance and corrosion resistance. Grinding applications on centrifugal pumps. Background technique [0002] Ultra-high molecular weight polyethylene (UHMWPE, molecular formula: -(-CH2-CH2-)-n) has excellent anti-corrosion performance, good wear resistance and economy, and one of its uses is as a corrosion-resistant and wear-resistant centrifugal Materials for pumps, e.g. as pump liners or extruded all-plastic pumps. UHMWPE has an extremely low melt index and poor processing fluidity. Therefore, it is used to form complex cavities such as centrifugal shell volutes. It cannot be formed by injection molding or extrusion molding. Ten th...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08K9/04C08K7/04F04D29/02
Inventor 蒋龙福
Owner 宜兴市宙斯泵业有限公司
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