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Method for improving crystallization behavior of polymer or polymer blend

A technology of polymers and blends, applied in the chemical field, can solve problems that have not yet been formed, and achieve the effects of eliminating thermal gradients, improving performance, and improving interfacial compatibility

Inactive Publication Date: 2008-02-06
CHANGCHUN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to improve the crystallization behavior of polymers or polymer blends and improve the crystallization ability of polymers or polymer blends, some people have used ultraviolet light, γ-ray irradiation and other methods to improve the crystallization properties of polymers. impacts have been studied, but no technical solutions are currently available to obtain crystalline products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0007] Sample material and sample preparation

[0008] PET (Acheng Polyester Factory) or PEN (US Shell Company) or PTT (US Shell Company) or PEN / PET blend (PEN 40wt%) samples were dried in a vacuum oven at 120°C for 24h, and then heated with a German Thermo Haake Rheomix TYP557-1302 single-screw extruder for melt blending, extrusion, stretching, air cooling, granulation, screw diameter of 30mm, length-to-diameter ratio of 25:1, strict control of screw speed, so that the material in the extruder The residence time is about 3 minutes. The melting temperature is PET280℃, PTT250℃, PEN300℃, and the working condition is 230V / 50-60Hz / 4A. The blend slices were pressed into 1mm-thick slices with a mold at 280°C and 24.5Mpa on a hydraulic press, preheated for 3mim, hot-pressed for 3min, and then quickly moved to a cold press to maintain pressure (24.5Mpa) and cold-press.

[0009] Microwave Radiation Crystallization

[0010] The MAS-1 microwave oven (power range 0-1000w, temperature r...

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PUM

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Abstract

The present invention relates to a method of improving high polymer or high polymer blends crystallization; and is used to overcome the long time of prior isothermal crystallization. The method of the present invention that improves high polymer or high polymer blends crystallization is to eradiate high polymer or high polymer blends with 2-3GHZ frequency microwave, the radiating dose is 0.10-1.0mW / cm2 and the radiation lasts two to four minutes. The beneficial effects of the present invention are that: since microwave penetrates and heats the heated body, the time of thermal conduction is saved and thermal grads eradicated, which can greatly save the time for isothermal crystallization. The same sample is completed with the method of conventional isothermal crystallization in a plurality of hours or more, but can be completed in microwave field in seconds or minutes. Also, critical compatibility of high polymer blends can be improved in microwave field. The method of using microwave radiation to improve high polymer crystallization also has the advantages of convenient processing and energy saving.

Description

technical field [0001] The invention belongs to the field of chemistry, in particular to the crystallization of high polymers. Background technique [0002] In the past, in order to improve the crystallization behavior of polymers or polymer blends, conventional thermal methods such as heat conduction and heat radiation were used, and it took several hours or more to complete the sample of the usual size. In terms of equipment occupation and human input, the test or production cost is increased. In order to improve the crystallization behavior of polymers or polymer blends and improve the crystallization ability of polymers or polymer blends, some people have used ultraviolet light, γ-ray irradiation and other methods to improve the crystallization properties of polymers. The impact of crystalline substances has been studied, but the technical solutions for obtaining crystalline products have not yet been formed. Contents of the invention [0003] The object of the prese...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/28
Inventor 李桂娟董添
Owner CHANGCHUN UNIV OF TECH
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