Method for rapid crystallization of polymer at high temperature

A polymer and rapid technology, applied in the field of polymer materials, can solve the problems of complex process, low temperature, difficult continuous operation, etc., and achieve the effect of easy industrial production, wide application and low cost

Inactive Publication Date: 2017-03-22
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The applicant's patent CN105199348A "a method for preparing a high-strength, high-toughness heat-resistant polylactic acid base film material" although the method carries out thermal stretching treatment above the glass transition temperature, the polylactic acid base film material forms a large number of shishi-kebab structures and High-strength, high-toughness heat-resistant polylactic acid is obtained, but this method must be pressed into a film after melting the polylactic acid and cooled rapidly to below the glass transition temperature, and it is necessary to ensure that crystallization does not occur during the cooling process, and then use other equipment to The film is raised to the stretching temperature to crystallize polylactic acid
Not only is the process complicated and difficult to operate continuously, but also the crystallization of polylactic acid induced by it is a cold crystallization process, and the crystallization temperature is relatively low

Method used

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  • Method for rapid crystallization of polymer at high temperature
  • Method for rapid crystallization of polymer at high temperature
  • Method for rapid crystallization of polymer at high temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Weigh the dried N,N'-1,2-bis(phenyloxalamide)-ethane and polylactic acid (4032D), add it to the torque rheometer according to the mass ratio of 0.5 / 99.5, and set it at 180°C After melt blending at 50rpm for 4min, the resulting composition was heated to 240°C by a rotational rheometer to completely dissolve N,N'-1,2-bis(phenyloxalamide)-ethane in the poly In lactic acid, keep the temperature constant for 2 minutes, then cool down at 5°C / min to 155°C and apply shear (shear rate: 0.4rad / s, shear time: 5s), then carry out isothermal crystallization test at this temperature, and calculate half Crystallization time (t 1 / 2 ), the sample after the test was characterized by DSC for its crystallinity, and the test results were listed in Table 1.

Embodiment 2

[0038]Weigh the dried N,N'-1,2-bis(phenyloxalamide)-butane and polylactic acid (4032D), add it to the torque rheometer at a mass ratio of 0.5 / 99.5, After melt blending at 50rpm for 4min, the resulting composition was heated up to 200°C in a rotary rheometer, and N,N'-1,2-bis(phenyloxalamide)-butane was completely dissolved in the poly In lactic acid, keep the temperature constant for 2 minutes, then cool down at 5°C / min to 155°C and apply shear (shear rate: 0.4rad / s, shear time: 5s), then carry out isothermal crystallization test at this temperature, and calculate half Crystallization time (t 1 / 2 ), the sample after the test was characterized by DSC for its crystallinity, and the test results were listed in Table 1.

Embodiment 3

[0040] Weigh the dried N,N'-1,2-bis(phenyloxalamide)-butane and polyhydroxybutyrate-valerate copolymer (PHBV), and add it to the In the moment rheometer, after melt blending at 160°C and 50rpm for 4min, the resulting composition was heated up to 200°C in the rotational rheometer, and N,N'-1,2-bis(phenylethanedi Amide)-butane was completely dissolved in polylactic acid, kept at constant temperature for 2 minutes, and then cooled at 5°C / min to 120°C to apply shear (shear rate 0.5rad / s, shear 20s), and then carried out isothermal crystallization at this temperature Test, calculate half crystallization time (t 1 / 2 ), the sample after the test was characterized by DSC for its crystallinity, and the test results were listed in Table 1.

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Abstract

The invention discloses a method for rapid crystallization of a polymer at high temperature. The method includes the steps of (1) subjecting a polymer and an organic nucleating agent to melt blending according to a weight part at a first temperature to obtain a uniformly dispersed composition; and (2) shearing the composition at a second temperature to promote rapid crystallization of the polymer. At the second temperature, the semi-crystallization time t1/2 of the polymer material is shortened to less than 25min, thus endowing the material with excellent physical and mechanical properties and heat resistance, etc.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a method for rapid crystallization of polymers at high temperatures. Background technique [0002] Polyester materials are widely used in various fields of the current national economy due to their outstanding advantages such as wide source of raw materials, convenient processing, and light weight. However, the poor flexibility of the molecular chain of crystalline polyester materials leads to problems such as slow crystallization rate and low crystallinity, which lead to long molding cycle, low heat resistance temperature and low material strength of polyester materials. These problems restrict the development and application of polyester, especially as engineering materials. Therefore, improving the crystallization rate and crystallinity of polyester is the most urgent problem to be solved in the development of polyester industry. [0003] At present, adding an inor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L67/02C08L23/12C08L23/08C08K5/20C08K5/25
CPCC08L67/04C08K5/20C08K5/25C08L2205/025C08L2205/24C08L67/02C08L23/12C08L23/0815
Inventor 马丕明于清清曾庆韬余鳗漫沈田丰东为富陈明清
Owner JIANGNAN UNIV
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