Method for improving effective blending of polymers with different viscosities by aid of supercritical fluids

A supercritical fluid and polymer technology, which is applied in the field of polymer processing, can solve the problems of poor compatibility and inefficiency, and achieve the effect of simple recycling and convenient use

Active Publication Date: 2013-11-27
杭州晟天新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is also difficult to work when the two components are poorly compatible

Method used

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  • Method for improving effective blending of polymers with different viscosities by aid of supercritical fluids
  • Method for improving effective blending of polymers with different viscosities by aid of supercritical fluids

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Polystyrene (melt flow rate 1.5g / 10min) and low density polyethylene (melt flow rate 40g / 10min) are two polymers with widely different viscosities. Stir and mix 50kg of polystyrene and 50kg of low-density polyethylene, and then add them to the feed zone or hopper of a twin-screw extruder with an aspect ratio L / D of 32:1, and inject the polymer mixed melt The speed is 500g / min. The supercritical carbon dioxide fluid is continuously injected into the polymer mixed melt through the air hole on the barrel of the twin-screw extruder. The injection speed of the supercritical carbon dioxide fluid is 2g / min, and the control screw speed is: 100 rpm, Control the temperature of the twin-screw from the feed section to the head to 150°C, 170°C, 170°C, 160°C respectively, and the temperature of the head to 155°C. The first viscosity of body satisfies following relational formula: (the initial viscosity of mixed melt-the first viscosity of mixed melt) ÷ the initial viscosity of mixed...

Embodiment 2

[0034] Ultra-high molecular weight polyethylene (melt flow rate is close to 0g / 10min) and nylon 66 (melt flow rate is 20g / 10min) are two polymers with a large difference in viscosity. 30kg of ultra-high molecular weight polyethylene and 70kg of After the ultra-high molecular weight polyethylene is stirred and mixed evenly, it is added to the feed zone or hopper of a twin-screw extruder with an aspect ratio L / D of 48:1, and the injection speed of the polymer mixed melt is 2000g / min. The supercritical ethane fluid is continuously injected into the polymer mixed melt through the air holes on the barrel of the twin-screw extruder. The injection speed of the supercritical ethane fluid is 6g / min, and the control screw speed is: 300 rpm Points, control the temperature of the twin-screw from the feed section to the machine head to 200°C, 235°C, 235°C, 215°C respectively, and the temperature of the machine head to 205°C, extrude and granulate, this process can ensure stirring in the mol...

Embodiment 3

[0043] Polystyrene (melt flow rate 1.5g / 10min) and low density polyethylene (melt flow rate 40g / 10min) are two polymers with widely different viscosities. Stir and mix 60kg of polystyrene and 50kg of low-density polyethylene, and then add them to the feed zone or hopper of a twin-screw extruder with a length-to-diameter ratio of L / D of 32:1. The injection of the polymer mixed melt The speed is 1000g / min. The supercritical carbon dioxide fluid is continuously injected into the polymer mixed melt through the air hole on the barrel of the twin-screw extruder, the injection speed of the supercritical nitrogen fluid is 4g / min, and the control screw speed is: 200 rpm, Control the temperature of the twin-screw from the feed section to the head to 150°C, 170°C, 170°C, 160°C respectively, and the temperature of the head to 155°C. The first viscosity of body satisfies following relational formula: (the initial viscosity of mixed melt-the first viscosity of mixed melt) ÷ the initial vis...

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Abstract

The invention discloses a method for improving effective blending of polymers with different viscosities by the aid of supercritical fluids. The method includes the steps: filling the supercritical fluids into mixed melts of the polymers with the different viscosities; stirring the mixed melts until the first viscosity of the mixed melts is lower than the initial viscosity of the mixed melts in a molten state; and reducing temperature while continuously stirring until the second viscosity of the mixed melts is slightly increased, and reducing pressure and exhausting air. By the aid of plasticization of the supercritical fluids for the polymers, some physical properties of the polymers are changed, for example, the viscosities are reduced, the free volume is increased, molecular chain mobility is enhanced and the like, and two-phase or multi-phase viscosity ratio and interfacial tension can be reduced, so that split-phase degree is improved, dispersion of dispersed phases in a polymer matrix is improved, and power consumption for processing the polymers with the different viscosities in equipment such as an extruder and the like can be reduced.

Description

technical field [0001] The invention relates to the field of polymer processing, in particular to a method for effectively blending polymers with different viscosities by using a supercritical fluid. Background technique [0002] Polymer blending is a topic of widespread concern in academia and industry, and optimizing the blend morphology is one of the key factors to obtain high-performance polymer blend materials. When traditional melt processing methods are used to blend polymers with different viscosities, especially those with widely different viscosities, the low-viscosity components usually undergo phase separation and enter the high shear rate zone of the mixing equipment, and the mixing quality of the blend varies with the composition. It decreases with the increase of partial viscosity difference. The traditional solution is to gradually add low-viscosity components into a high-viscosity polymer matrix to gradually reduce the viscosity difference between the two c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L25/06C08L23/06C08L77/06B29C47/92B29C48/92
CPCB29C48/40
Inventor 蔡增坤
Owner 杭州晟天新材料科技有限公司
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