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Preparation method of injection molding grade UHMWPE (Ultra-High Molecular Weight Polyethylene)

A technology of ultra-high molecular weight and polyethylene, which is applied in the field of polymer compound modification processing, can solve the problem of poor flow modification effect, etc., and achieve the reduction of van der Waals force, increase of fluidity and mechanical properties, and high flow performance Effect

Active Publication Date: 2016-11-16
SHANGHAI RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent uses low molecular weight polyolefin as a flow modifier, and its flow modification effect is not as good as that of solvent oil introduced in the polymerization process of ultra-high molecular weight polyethylene.

Method used

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  • Preparation method of injection molding grade UHMWPE (Ultra-High Molecular Weight Polyethylene)
  • Preparation method of injection molding grade UHMWPE (Ultra-High Molecular Weight Polyethylene)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] a. Heat the reactor to the reaction temperature of 70°C, vacuumize and dry, then replace with nitrogen, add 90 parts of 120# gasoline, 1 part of white oil and 0.001 part of alkylaluminum / TiCl 4 Catalyst, feed 100 parts of ethylene under the stirring condition of 400r / min, control the pressure to 0.5MPa, and react at the reaction temperature for 5 hours. After drying, obtain ultra-high molecular weight polyethylene resin containing solvent naphtha;

[0027] b. Dilute 0.01 part of vinyl siloxane with 0.04 part of ethanol, stir 5 parts of ultrafine molybdenum disulfide powder with a high-speed mixer, and spray the diluted vinyl siloxane on it until the spray is evenly wet, and then put The mixture is air-dried;

[0028] c. Mix 0.7 parts of antioxidant 1010, 5 parts of high-density polyethylene, 5 parts of low-density polyethylene, 5 parts of polyethylene wax, 100 parts of the resin obtained in step a and the mixture obtained in step b at 10°C for 10 minute;

[0029] d. ...

Embodiment 2

[0032] a. Heat the reactor to the reaction temperature of 90°C, vacuumize and dry, then replace with nitrogen, add 200 parts of hexane, 20 parts of kerosene and 0.005 parts of alkylaluminum / TiCl 4 Catalyst, feed 100 parts of ethylene under the stirring condition of 1200r / min, control the pressure at 0.8MPa, react at the reaction temperature for 1 hour, after the reaction is completed, quickly cool to 50°C, filter the hexane to obtain a slurry, and dry the slurry After obtaining the ultra-high molecular weight polyethylene resin containing solvent naphtha;

[0033] b. Dilute 0.05 parts of vinyl siloxane with 0.1 part of ethanol, stir 5 parts of graphite and 5 parts of ultrafine molybdenum disulfide powder with a high-speed mixer, and spray the diluted vinyl siloxane on it until the spray is uniform and wet until the mixture is air-dried;

[0034] c. 0.4 parts of antioxidant 168, 10 parts of high-density polyethylene, 100 parts of the resin obtained in step a and the mixture ob...

Embodiment 3

[0038] a. Heat the reactor to the reaction temperature of 80°C, vacuumize and dry, then replace with nitrogen, add 100 parts of heptane, 10 parts of paraffin oil and 0.002 parts of alkylaluminum / TiCl 4 Catalyst, feed 100 parts of ethylene under the stirring condition of 1000r / min, control the pressure to 0.6MPa, react at the reaction temperature for 4 hours, after the reaction is completed, quickly cool to 30°C, filter the heptane to obtain a slurry, and dry the slurry After obtaining the ultra-high molecular weight polyethylene resin containing solvent naphtha;

[0039] b. Dilute 0.02 parts of isopropyl dioleic acid acyloxy (dioctyl phosphate acyloxy) titanate with 0.2 parts of ethanol, stir 3 parts of montmorillonite and 3 parts of talcum powder with a high-speed mixer, and put on top Spray diluted isopropyl dioleate (dioctyl phosphate acyloxy) titanate until the spray is evenly wet, then allow the mixture to air dry;

[0040] c. Mix 0.5 parts of antioxidant 1076, 5 parts o...

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Abstract

The invention relates to a preparation method of injection molding grade UHMWPE (Ultra-High Molecular Weight Polyethylene). The preparation method comprises the following steps: adding a certain amount of solvent oil in a dispersion medium, and polymerizing, thus obtaining UHMWPE containing the solvent oil; extruding through a screw extruder after mixing a flow modifier, a function additive processed by a coupling agent, an antioxidant and the UHMWPE containing the solvent oil at high speed, thus obtaining the injection molding grade UHMWPE. Compared with the prior art, the injection molding grade UHMWPE prepared by the method has good liquidity and good mechanical performance, can be machined and formed on a common injection molding and extrusion device, the machining efficiency is increased, and the injection molding grade UHMWPE can be widely applied to many fields of spaceflight, military industry, automobiles, high-speed rails, rail transit, spinner accessories and the like.

Description

technical field [0001] The invention belongs to the field of polymerization modification processing of polymer compounds, and in particular relates to a preparation method of injection molding grade ultra-high molecular weight polyethylene. Background technique [0002] Ultra-high molecular weight polyethylene has incomparable wear resistance, corrosion resistance, impact resistance, low temperature resistance and self-lubricating properties compared to other engineering plastics. It is called "magic plastic" by foreign media, but due to its ultra-high molecular weight (Viscosity average molecular weight is more than 1.5 million), melt viscosity is as high as 10 8 Pa·s, the melt index is almost zero. This makes the processing and molding of ultra-high molecular weight polyethylene more difficult, and ordinary extrusion and injection molding cannot be used. Generally, the molding-sintering method is used to process plates and rods with simple shapes, and the processing effic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08L91/06C08L91/00C08K13/06C08K9/06C08K3/30C08K3/34C08K3/36C08K5/01
CPCC08K2201/014C08L23/06C08L2205/02C08L2205/025C08L2205/03C08L2205/035C08L2207/062C08L2207/066C08L2207/068C08L91/00C08L91/06C08K9/06C08K2003/3009C08K5/01C08K13/06C08K9/04C08K3/346C08K3/34C08K3/36
Inventor 张玉梅巩明方王新威王萍孙勇飞徐迅侯秀红
Owner SHANGHAI RES INST OF CHEM IND
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