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Method and device for regulating aggregate structure of thermoplastic semicrystalline polymer by using pulsed magnetic field

A pulsed magnetic field and polymer technology, applied in the field of regulating polymer aggregate structure

Inactive Publication Date: 2011-04-27
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Based on the above literature reports, at present, there are few reports on the research on the regulation of polymer aggregate structure by pulsed magnetic field. This patent introduces pulsed magnetic field into the molding process of semi-crystalline polymers to regulate the aggregate structure and properties of polymers.

Method used

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  • Method and device for regulating aggregate structure of thermoplastic semicrystalline polymer by using pulsed magnetic field
  • Method and device for regulating aggregate structure of thermoplastic semicrystalline polymer by using pulsed magnetic field
  • Method and device for regulating aggregate structure of thermoplastic semicrystalline polymer by using pulsed magnetic field

Examples

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Effect test

Embodiment 1

[0026] Embodiment one: non-pulse magnetic field processing polytrimethylene terephthalate (PTT) isothermal crystallization process, specifically adopt following technical scheme:

[0027] (a) Sample drying: The polymer raw material was dried at 130°C for 12 hours to fully remove moisture.

[0028] (b) Place the sample: place the sample in the 1-copper tube and fix it in the 2-sample furnace, then seal it and evacuate it, and protect it with argon.

[0029] (c) Eliminate heat history: start from room temperature and heat at a rate of 10°C / min to about 260°C for 15 minutes.

[0030] (d) Isothermal crystallization: cooling to 195° C. for 60 minutes at a cooling rate of 5° C. / min.

[0031] (e) Cooling process: After the isothermal crystallization is completed, cool down to room temperature at a cooling rate of 5 °C / min, turn off all instruments and devices, and end the experiment.

Embodiment 2

[0032] Embodiment two: pulsed magnetic field condition: pulsed magnetic field intensity 1T; Magnetization frequency 2 times / minute; Whole course magnetic field treatment of isothermal crystallization process (such as figure 2 As shown, the I-V section area is magnetic). The polytrimethylene terephthalate (PTT) crystallization process specifically adopts the following technical scheme:

[0033] (a) Sample drying: The polymer raw material was dried at 130°C for 12 hours to fully remove moisture.

[0034] (b) Place the sample: place the sample in the 1-copper tube and fix it in the 2-sample furnace, then seal it and evacuate it, and protect it with argon.

[0035] (c) Adjust the intensity of the pulsed magnetic field to 1T; after the magnetization frequency is 2 times / minute, turn on the pulsed magnetic field device.

[0036] (d) Eliminate heat history: start from room temperature and heat at a rate of 10°C / min to about 260°C for 15 minutes.

[0037] (e) Isothermal crystalliz...

Embodiment 3

[0039] Embodiment 3: pulsed magnetic field conditions: pulsed magnetic field intensity 2T; magnetization frequency 2 times / minute; whole process of isothermal crystallization process with magnetic field treatment process polytrimethylene terephthalate (PTT) crystallization process, specifically adopt the technical scheme as described in embodiment 2 stated.

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Abstract

The invention relates to a method and a device for regulating an aggregate structure of thermoplastic semicrystalline polymer by using a pulsed magnetic field. The method comprises the following steps of: drying polymer; putting a polymer raw material under the pulsed magnetic field in inert atmosphere, or eliminating the thermal history of the polymer and putting the polymer under the pulsed magnetic field; controlling the intensity and frequency of the pulsed magnetic field; heating at the heating speed of 2 to 10 DEG C / minute to a temperature which is 20 to 30 DEG C higher than the melting point of the polymer, and keeping the temperature for 10 to 20 minutes; cooling at the cooling speed of 2 to 10 DEG C / minute to a temperature which is 75 to 95 DEG C lower than the melting point of the polymer, performing isothermal crystallization on the polymer for 5 to 240 minutes, and cooling at the cooling speed of 2 to 10 DEG C / minute to room temperature; or cooling at the constant cooling speed of 2 to 10 DEG C / minute to room temperature. By adopting the pulsed magnetic field, the crystallization action of the thermoplastic semicrystalline polymer can be changed so as to control the structure and optimize performance.

Description

technical field [0001] The invention relates to a method and a device for regulating the aggregation structure of a polymer, in particular to a method and a device for regulating the aggregation structure of a thermoplastic semi-crystalline polymer by a pulsed magnetic field. Background technique [0002] It is well known that the physical properties of polymer materials depend to a large extent on the molecular aggregate structure, so better control of the spatial structure of these materials is needed to improve their performance. For the practical application of polymer materials or products, their performance directly depends on the aggregate structure formed during processing and molding. Therefore, understanding the relationship between the structural characteristics of polymer aggregates, formation conditions and material properties is crucial for controlling Processing and molding conditions are essential to obtain materials with predetermined structures and properti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/28
Inventor 刘丽顾巍巍周杰李明夏文健
Owner SHANGHAI UNIV
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