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Superhigh molecular weight polyethylene material and preparation thereof

An ultra-high molecular weight, polyethylene technology, applied in the field of ultra-high molecular weight polymer materials and their preparation, can solve the problems of limited application scope, low production efficiency, and decreased mechanical properties of materials

Active Publication Date: 2012-08-22
上海化工研究院天地科技发展有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the post-crosslinking treatment of ultra-high molecular weight polyethylene, only peroxide crosslinking is usually used.
However, the disadvantage of using peroxide cross-linking is that although the traditional peroxide cross-linking UHMWPE for compression molding can improve the wear resistance of UHMWPE materials, it will cause the mechanical properties of the material to decline, which is even more severe. Limit its application range, low production efficiency and high cost, which greatly restrict the development of materials
But its disadvantage is that the raw material needs to be dissolved in the solvent, the application is limited to wire drawing, and it cannot be extruded into sheets and various shaped materials, and the wear resistance and heat resistance of the material are not improved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0098] Preparation method of ultra-high molecular weight polyethylene material

[0099] A kind of preparation method of ultrahigh molecular weight polyethylene material of the present invention is made by the method comprising the following steps:

[0100] (1) providing the mixture of the above-mentioned ultra-high molecular weight polyethylene composition, silane crosslinking agent, and optional polymer acceptable auxiliary agent;

[0101] (2) The mixture in the step (1) is extruded to obtain the ultra-high molecular weight polyethylene material.

[0102] The meanings of the ultra-high molecular weight polyethylene composition, silane crosslinking agent, and optional macromolecular acceptable assistants are as described above.

[0103] In step (1), the mixing order of the ultra-high molecular weight polyethylene composition, silane crosslinking agent, and optional macromolecular acceptable additives is not specifically limited, and can be determined according to process requ...

Embodiment 1

[0126] The ultra-high molecular weight polyethylene resin is pretreated in an oven so that its moisture content is below 300ppm, and the four raw materials in the following table are put into a high-speed mixer in proportion, stirred at a high speed for 5-10 minutes, and discharged for later use to obtain Raw material for flow modification system.

[0127] Mix silane compound (vinyltrialkoxysilane), catalyst (dibutyltin dilaurate, 2-10% by mass of silane compound) in a glass container, add 250ml of diluent, stir well and add to sprayer In, ready to use.

[0128] Add the raw materials of the flow modification system (that is, the ultra-high molecular weight polyethylene composition) and the antioxidant to the high-speed stirrer in a mass percentage ratio of 100:1, and then adjust the Stir at a low speed, and at the same time, spray slowly with a sprayer through the observation hole of the high-speed stirrer (the weight ratio of the flow modification system raw material and the...

Embodiment 2

[0143] Pretreat the ultra-high molecular weight polyethylene resin in an oven so that the moisture content is below 300ppm, put the four raw materials in the following table into the high-speed mixer in proportion and order, stir at high speed for 5-10 minutes, and discharge the material for later use .

[0144] Mix silane compound (vinyltrialkoxysilane), catalyst (dibutyltin dilaurate, 2-10% by mass of silane compound) in a glass container, add 250ml of diluent, stir well and add to sprayer In, ready to use.

[0145] Add the flow modification system raw material and antioxidant into the high-speed agitator in sequence, and after stirring at high speed for 1 min in advance, adjust to low-speed agitation. The weight ratio to the silane compound is controlled at 45:1), and after a duration of 10 minutes, the material is discharged for use to obtain the raw material of the extruded profile of the crosslinking system. Wherein, the mass percentage ratio of the flow modification s...

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Abstract

The invention provides a silane crosslinked super high molecular weight polyethylene composition. The composition comprises: (a) super high molecular weight polyethylene resin accounts for 60-83% of composition weights; (6) polypropylene polymer or multipolymer accounts% for 5-20 of composition weights; (c) inorganic nano modifier accounts for 2-15% of composition weights; (d) compatibilizer accounts for 0-5% of composition weights. The composition can be extruded and molded to prepare super high molecular weight polyethylene crosslinked products which have good wearing resistance and thermalstability.

Description

technical field [0001] The invention relates to an ultra-high molecular weight polymer material and a preparation method thereof, in particular to an ultra-high molecular weight polyethylene material and a preparation method thereof. Background technique [0002] Ultra-high molecular weight polyethylene is a thermoplastic engineering plastic with excellent performance. Due to its linear macromolecular structure and long molecular chain, it has extremely high impact strength and excellent mechanical properties. However, its disadvantage is that it is extremely insensitive to thermal shear, prone to shear fracture, or thermally degraded, and because its molecular chains are entangled with each other, and its melt viscosity is extremely high, it is difficult to use ordinary plastic processing equipment and Technology for processing and molding. [0003] In order to improve its shortcomings, cross-linking treatment is required in the later stage of producing UHMWPE. Polyolefin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/06C08K7/00C08L23/10C08L51/06C08K5/54
Inventor 洪尉吴向阳张炜张玉梅孟赟赵春保
Owner 上海化工研究院天地科技发展有限公司