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Method for regulating and controlling crystallization speed of crystal form II of isotactic polybutylene-1

A technology of isotactic polybutene and crystallization speed, which is applied in the field of macromolecule aggregate structure regulation, can solve the problems of harsh high pressure requirements, increased production costs, and inability to be applied, so as to speed up the crystallization speed, promote the production process, The effect of shortening the crystallization time

Inactive Publication Date: 2020-11-13
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These technologies can accelerate the crystallization of polybutene-1 to a certain extent, but high pressure requires harsh conditions, industrial production will increase production costs, and the addition of other nucleating agents may affect the purity of the material and lead to its application. Restricted from wider application

Method used

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  • Method for regulating and controlling crystallization speed of crystal form II of isotactic polybutylene-1
  • Method for regulating and controlling crystallization speed of crystal form II of isotactic polybutylene-1
  • Method for regulating and controlling crystallization speed of crystal form II of isotactic polybutylene-1

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The blank melt of isotactic polybutene-1 prepared in this example is used as a comparison of the melt of isotactic polybutene-1 near melting point prepared in the present invention. The operation steps are as follows:

[0031] (1) Turn on the differential scanning calorimeter, pass in nitrogen gas (gas flow rate 50ml / min) for protection, and turn on the refrigeration program to reduce the temperature at the lower end of the furnace sensor to -80°C. After the temperature drops to the set temperature, the empty aluminum crucible without sample is used as a reference, and the sample crucible is placed on the reference end and the sample end of the furnace body of the differential scanning calorimeter respectively;

[0032] (2) Raise the temperature of the isotactic polybutene-1 crystal form I sample at 10°C / min to 150°C for 5min to eliminate thermal and mechanical history. At this time, the melt state is a blank melt without an ordered structure;

[0033] (3) Cooling at 1...

Embodiment 2

[0035] This example prepares an isotactic polybutene-1 melt containing crystal form I crystallites, and the content of crystal form I crystallites in the isotactic polybutene-1 melt is regulated by the melting temperature to achieve control of crystal form II crystallization purpose of speed. The operation steps are as follows:

[0036] (1) Turn on the differential scanning calorimeter, pass in nitrogen gas (gas flow rate 50ml / min) for protection, and turn on the refrigeration program to reduce the temperature at the lower end of the furnace sensor to -80°C. After the temperature drops to the set temperature, the empty aluminum crucible without sample is used as a reference, and the sample crucible is placed on the reference end and the sample end of the furnace body of the differential scanning calorimeter respectively;

[0037] (2) The isotactic polybutene-1 sample containing crystal form I was heated at 10°C / min to 126°C-140°C for 5 minutes to obtain isotactic polybutene-1...

Embodiment 3

[0042] In this example, an isotactic polybutene-1 melt containing crystal form I crystallites was prepared, and the content of crystal form I crystallites in the melt was regulated by the melting temperature to achieve the purpose of controlling the crystallization temperature of crystal form II. The operation steps are as follows:

[0043] (1) Turn on the differential scanning calorimeter, pass in nitrogen gas (gas flow rate 50ml / min) for protection, and turn on the refrigeration program to reduce the temperature at the lower end of the furnace sensor to -80°C. After the temperature drops to the set temperature, the empty aluminum crucible without sample is used as a reference, and the sample crucible is placed on the reference end and the sample end of the furnace body of the differential scanning calorimeter respectively;

[0044] (2) The isotactic polybutene-1 sample containing crystal form I was heated at 10°C / min to 126°C-140°C for 5 minutes to obtain isotactic polybuten...

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Abstract

The invention discloses a method for regulating and controlling the crystallization speed of a crystal form II of isotactic polybutene-1. The method comprises the following steps: heating an isotacticpolybutene-1 raw material to a temperature close to the melting point of a crystal form I, and conducting heat preservation to obtain melt containing residual microcrystals of the crystal form I, wherein different microcrystal contents of the crystal form I can be obtained by changing a melting temperature; conducting cooling to a crystallization temperature of the crystal form II, and allowing the residual microcrystals of the crystal form I to induce the crystal form II to rapidly nucleate, wherein the crystallization speed of the crystal form II is increased along with the increase of theresidual crystal form I in the melt. According to the invention, the crystallization process of the crystal form II can be accelerated without adding a nucleating agent or introducing other fillers during crystallization, and the transparency, the purity and the like of isotactic polybutene-1 are not influenced at all, so the application range of polybutene-1 is expected to be expanded to a largeextent; and meanwhile, production time is shortened, production efficiency is improved, and good potential economic benefits are achieved for industrial production.

Description

technical field [0001] The invention belongs to the field of macromolecule aggregation state structure regulation. The invention relates to a method for regulating the crystallization speed of the isotactic polybutene-1 crystal form II, specifically adjusting the crystallization process of the isotactic polybutene-1 crystal form II by changing the content of the crystal form I in the melt. [0002] technical background [0003] Isotactic polybutene-1 (PB-1) is a linear polyolefin material synthesized from 1-butene as a monomer. It has strong crystallization ability and has various crystal structures. According to the stereotype, polybutene-1 can be divided into three types: isotactic, syndiotactic and atactic, among which isotactic polybutene-1 is the most widely used. Isotactic polybutene-1 has outstanding heat resistance, creep resistance, good toughness, wear resistance and excellent processability, etc. It can be used to make floor heating pipes, easy-peelable films and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/00C08L23/12
CPCC08J3/00C08J2323/12
Inventor 陈静波魏宏星张彬
Owner ZHENGZHOU UNIV
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