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Technology for controlling polymer crystallization degree in extrusion processing process

A processing and polymer technology, applied in the field of polymer crystallinity control, can solve the problems of instability and low performance, and achieve the effect of high yield, low cost, stable and uniform crystallinity

Active Publication Date: 2019-03-19
JF POLYMERS (SUZHOU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For many crystalline polymers, the traditional process will lead to the crystallinity, low performance and instability of the final extruded product, and even internal stress and other undesirable phenomena

Method used

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  • Technology for controlling polymer crystallization degree in extrusion processing process
  • Technology for controlling polymer crystallization degree in extrusion processing process
  • Technology for controlling polymer crystallization degree in extrusion processing process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The L1001 brand polylactic acid material from Suzhou Jufu Polymer Material Co., Ltd. was selected for extrusion processing, and the relevant parameters of the material and its crystallization behavior were obtained by DSC measurement on Shimadzu's DSC-60Plus instrument. The specific measurement method is: use a high-precision balance to weigh 50 mg of the material to be tested, put it into an aluminum crucible, add an aluminum upper cover, press the sample and put it into the instrument. Set the heating and cooling program of the instrument as follows: firstly raise the temperature from room temperature to 230°C at a rate of 10°C / min, and keep it constant for 3 minutes; then cool down to 20°C at a rate of 10°C / min, and keep it constant for 3 minutes; The temperature was raised to 230° C., and the experiment ended. Heat flow data is extracted for the entire process and the associated temperature of the material is obtained from the curve peak data. The properties relate...

Embodiment 2

[0058] The L2001 brand polylactic acid material produced by Suzhou Jufu Polymer Materials Co., Ltd. was used for extrusion processing, and the detection method of Example 1 was used to obtain the relevant parameters of the material and its crystallization behavior through DSC measurement on the DSC-60Plus instrument of Shimadzu. Finally, the properties related to the material and crystallization behavior are as follows: T g =56.6°C; T c =124.2°C; T cold =93.2°C; T m = 168.6°C. It can be seen that the material has both melt crystallization and cold crystallization behaviors. In the traditional wire rod production process, the cooling rate of the melt is 50-100°C / s, and the quenching inhibits the regular arrangement of molecular chains, which greatly affects the melt crystallization behavior, and the crystallinity in the wire rod is low.

[0059]According to the fact that the material has melt crystallization and cold crystallization behaviors at the same time, this embodime...

Embodiment 3

[0063] The L2001 brand polylactic acid material produced by Suzhou Jufu Polymer Materials Co., Ltd. was used for extrusion processing, and the detection method of Example 1 was used to obtain the relevant parameters of the material and its crystallization behavior through DSC measurement on the DSC-60Plus instrument of Shimadzu. Finally, the properties related to the material and crystallization behavior are as follows: T g =56.6°C; T c =124.2°C; T cold =93.2°C; T m = 168.6°C. It can be seen that the material has both melt crystallization and cold crystallization behaviors. In the traditional wire rod production process, the cooling rate of the melt is 50-100°C / s, and the quenching inhibits the regular arrangement of molecular chains, which greatly affects the melt crystallization behavior, and the crystallinity in the wire rod is low.

[0064] According to the fact that the material has melt crystallization and cold crystallization behaviors at the same time, this embodim...

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Abstract

The invention relates to the field of polymer crystallization degree control, and provides a technology for controlling polymer crystallization degree in an extrusion processing process. The technology for controlling the polymer crystallization degree in the extrusion processing process comprises the following steps that a crystalline polymer is melted and extruded; the extruded crystalline polymer melt is prepared the wire rod of the polymer material through a heat medium combination, the heat medium combination comprises n sections of heat medium, wherein n is a positive integer; and the number of the heat medium passing through the melt is 1, 2, 3...and n in sequence, and the temperature of the corresponding heat medium is T1, T2, T3...and Tn. The technology heat medium for controllingthe polymer crystallization in the extrusion processing process is divided into a plurality of sections, the section number of the heat medium and the specific temperature of each section can be selected flexibly combining with the crystallization behavior, the chemical property, the cost requirement and the like of the material; then the heat history of the material after extrusion is controlled, the crystallization of the materials is promoted, and the extruded products is guaranteed to have stable and uniform crystallization.

Description

technical field [0001] The invention relates to the field of polymer crystallinity control, in particular to a process for controlling polymer crystallinity during extrusion processing. Background technique [0002] At present, the common extrusion process in the field of polymer processing and manufacturing cannot control the crystallinity of crystalline polymers well. The result of this is that the crystallinity of the final extruded product of crystalline polymer is usually uncontrollable, thus resulting in unstable or unsatisfactory performance of the product. In recent years, 3D printing, also known as additive manufacturing, has gradually emerged. It is an advanced manufacturing method based on the principle of layer-by-layer material accumulation that has emerged and developed rapidly in the past 30 years. Material extrusion in its sub-process Material extrusion 3D printing has been widely used in recent years due to its advantages such as lower equipment cost, wider...

Claims

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Application Information

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IPC IPC(8): B29C48/88B29C48/05
Inventor 苗振兴罗小帆
Owner JF POLYMERS (SUZHOU) CO LTD
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