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Method for preparing low-odor polyethylene composition

A polyethylene, composition technology, applied in the field of preparation of ethylene polymer composition, to achieve good performance, inhibit thermal and oxygen degradation, and low production cost

Inactive Publication Date: 2018-11-02
SINOPEC YANGZI PETROCHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual processing process, it is also necessary to comprehensively consider the influence of the pore size, pore distribution, pore structure, and desorption temperature of the odor adsorbent, which is often difficult to fully meet the needs.

Method used

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  • Method for preparing low-odor polyethylene composition
  • Method for preparing low-odor polyethylene composition
  • Method for preparing low-odor polyethylene composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Take by weighing 50kg polyethylene powder (melt flow rate 0.2g / 10min), 25g antioxidant 1010, 50g antioxidant 168, 25g halogen absorbent calcium stearate, 500 grams of medical stone (2500 orders of particle size), 500 grams of zinc ricinoleate, after stirring and fully mixing, add the twin-screw extruder whose length-to-diameter ratio L / D is 48: 1, the feeding speed is 50g / min, and the screw speed is 100 rpm; supercritical carbon dioxide The fluid is fed into the extruder from the second heating zone of the twin-screw extruder, the quality of the supercritical carbon dioxide fluid is 20% of the polyethylene mass, and the feeding speed is 10 g / min. The twin-screw extruder is divided into 10 heating zones, the temperature of the first heating zone is 180°C, and the temperature of the other heating zones is 160°C-220°C. Vacuum devolatilize in the 8th area, extrude the granulated material strips to obtain the product through water-cooling and pelletizing.

Embodiment 2

[0049] Take by weighing 50kg polyethylene powder (melt flow rate 0.5g / 10min), 50g antioxidant 1010, 100g antioxidant 168, 25g halogen absorbent calcium stearate, 1500 grams of medical stone (2500 orders of particle size), 250 grams of zinc ricinoleate, after stirring and fully mixing, add the twin-screw extruder whose length-to-diameter ratio L / D is 48: 1, the feeding speed is 50g / min, and the screw speed is 100 rpm; supercritical carbon dioxide The fluid is fed into the extruder from the second heating zone of the twin-screw extruder, the quality of the supercritical carbon dioxide fluid is 10% of the polyethylene mass, and the feeding speed is 5g / min. The twin-screw extruder is divided into 10 heating zones, the temperature of the first heating zone is 180°C, and the temperature of the other heating zones is 160°C-220°C. In the 8th heating zone, the product is vacuumized and devolatilized, extruded and granulated, and then water-cooled and granulated to obtain the product. ...

Embodiment 3

[0051] Take by weighing 50kg polyethylene powder (melt flow rate 2.5g / 10min), 75g antioxidant 1076, 100g antioxidant 168, 50g halogen absorbent calcium stearate, 2500 grams of medical stone (2500 orders of particle size), 350 grams of zinc ricinoleate, after stirring and fully mixing, add the twin-screw extruder whose length-to-diameter ratio L / D is 48: 1, the feeding speed is 50g / min, and the screw speed is 100 rpm; supercritical carbon dioxide The fluid is fed into the extruder from the second heating zone of the twin-screw extruder, the quality of the supercritical carbon dioxide fluid is 30% of the polyethylene mass, and the feeding speed is 15g / min. The twin-screw extruder is divided into 10 heating zones, the temperature of the first heating zone is 180°C, and the temperature of the other heating zones is 160°C-220°C. In the 8th heating zone, the product is vacuumized and devolatilized, extruded and granulated, and then water-cooled and granulated to obtain the product. ...

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Abstract

The invention discloses a method for preparing a low-odor polyethylene composition and belongs to the technical field of materials. The composition at least comprises 100 parts of polyethylene, 0.05-0.15 part of a primary antioxidant, 0.1-0.3 part of an auxiliary antioxidant and 0.05-0.2 part of a halogen absorber. By using supercritical carbon dioxide assisted extrusion, heat and oxygen degradation of the polyethylene in the extrusion process can be effectively inhibited, dissolution of small molecule volatiles is greatly accelerated, and the small molecule volatiles are removed in front of an extruder mouth model in a pressure relief extraction manner. The method disclosed by the invention is simple in process, wide in application range, low in production cost and favorable for popularization and application.

Description

technical field [0001] The present invention relates to a method for the preparation of ethylene polymer compositions. Background technique [0002] Polyethylene (PE) is a polymer compound obtained by the polymerization of ethylene. Due to its rich raw materials and relatively simple synthesis process, compared with other general-purpose thermoplastics, PE has low price and outstanding stress resistance, cracking and wear resistance. It is the fastest growing variety among general-purpose thermoplastics. The status of construction and people's life is becoming more and more important, and it has become the fastest growing variety of plastics. It can be processed by blow molding, extrusion, injection molding and other methods, and is widely used in the manufacture of films, hollow products, fibers and daily sundries. However, polyethylene itself and various additives usually bring in a large odor, which limits its application in some fields, and with the development of the n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08K13/02C08K5/134C08K5/526C08K3/34C08K5/098C08K5/3492C08K13/04C08K7/26C08K5/527B29B9/06B29C47/92B29C48/92
CPCB29B9/06C08K3/34C08K5/098C08K5/1345C08K5/34924C08K5/526C08K5/527C08K7/26C08K13/02C08K13/04C08K2201/003C08K2201/014C08L23/06Y02P20/54
Inventor 左胜武邱敦瑞袁小亮王晶徐振明傅勇
Owner SINOPEC YANGZI PETROCHEM
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