Method for preparing thermoplastic resin of stereoregularity by using segmented polymerizing body of liquid phase

A thermoplastic resin, segmented polymerization technology, applied in a field, can solve the problems of harsh catalyst requirements, complex reaction process, no price advantage, etc., to achieve the effect of reducing investment capital, simple process and convenient processing

Inactive Publication Date: 2007-07-25
高菲
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The polymerization process adopted is two methods of liquid phase body and gas phase method. The disadvantage of this polymerization method is that it needs a special main catalyst to improve the molecular weight distribution, and the reaction process is also relatively complicated.
[0008] Judging from the current methods, the synthesis of high-isotactic poly-1-butene resin is either complicated in process or more demanding on the catalyst, which makes the synthesis cost relatively high. Compared with PPR for similar purposes, poly-1-butene resin no price advantage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] After evacuating the 1L polymerization kettle and replacing it with nitrogen several times, add a certain amount of 1-butene monomer, triethylaluminum, TiCl 4 / MgCl 2 , Diphenyldimethoxysilane, pre-polymerized at -5°C for 30 minutes, then raised the temperature to 50°C within 30 minutes to polymerize for 3 hours, and passed through H 2 Adjust its relative molecular mass, the hydrogen pressure is at 0.1 MPa, the stirring rate is maintained at 60 rpm, and then the reaction is terminated with ethanol.

[0032] The following performance test is done to the obtained poly-1-butene resin, and the results are listed in table 1,

Embodiment 2

[0034] Use a 50ml flask for prepolymerization, vacuumize the flask and replace it with nitrogen several times, then add a certain amount of 1-butene monomer, triethylaluminum, TiCl 4 / MgCl 2 , diphenyldimethoxysilane, pre-polymerized at -5°C for 30 minutes, and then transferred to a 1L reactor containing 1-butene monomer solution. The temperature of the reactor was kept at 50°C, and the stirring rate was 60 rpm, the reaction was terminated after 3 hours.

[0035] The following performance test is done to the obtained poly-1-butene resin, and the results are listed in table 1,

Embodiment 3

[0037] After evacuating the 1L polymerization kettle and replacing it with nitrogen several times, add a certain amount of 1-butene monomer / ethylene monomer (95 / 5 molar ratio), triethylaluminum, TiCl 4 / MgCl 2 , Diphenyldimethoxysilane, pre-polymerized at -5°C for 30 minutes, then raised the temperature to 50°C within 30 minutes to polymerize for 3 hours, and passed through H 2 Adjust its relative molecular mass, the hydrogen pressure is at 0.1 MPa, the stirring rate is maintained at 60 rpm, and then the reaction is terminated with ethanol.

[0038] The following performance test is done to the obtained poly-1-butene resin, and the results are listed in table 1,

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Abstract

This invention discloses a method for preparing isotactic 1-butylene homopolymer or copolymers with other alpha-olefins by multi-stage liquid-phase bulk polymerization. The method comprises: adding metal catalyst into a reactor with stirrer, pre-polymerizing at a temperature below the polymerization temperature, and polymerizing 1-butylene or 1-butylene and other alpha-olefins at 30-70 deg.C and a certain pressure. The melt flow rate of the obtained polymer is 0.01-50 g / 10 min (190 deg.C and 2.16 kg), and the isotacticity is higher than 92%. The molded product of the polymer has excellent heat resistance, low-temperature performance, processability, and high-temperature creep behavior, and can be used as resin for producing molded pipes. The method has such advantages as simple process, high efficiency and low cost, and the obtained polymer has such advantages as wide molecular weight distribution and good processability.

Description

technical field [0001] The invention belongs to the field of macromolecules, and relates to a method for preparing a stereoregular thermoplastic resin by liquid phase bulk polymerization, in particular to a high stereoregular 1-butene homopolymer and its combination with other α-olefins The new synthesis method of the copolymer, more specifically, the synthesis method of the high stereoregular polybutene polymer involved in the present invention adopts liquid phase bulk precipitation staged polymerization, has the advantages of simple process flow, high efficiency and low cost features. Background technique [0002] Generally, high isotactic poly-1-butene resins are semi-crystalline polyolefin thermoplastics produced by isotactic Ziegler-Natta polymerization, including homopolymers and a series of copolymers. It has physical properties similar to polyethylene and polypropylene, with a crystallinity between 50% and 60%, a melting point of about 130°C, and a density higher th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/08C08F2/02C08F4/654
Inventor 高菲
Owner 高菲
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