Propylene copolymer and preparation method thereof

A propylene copolymer and propylene technology, applied in the field of propylene copolymer and its preparation, can solve the problems of poor rheology, difficult processing, and difficulty in achieving a balance between rigidity and toughness of propylene copolymer.

Active Publication Date: 2019-05-14
TIANJIN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitations of the existing comonomers, the above-mentioned propylene copolymers are difficult to achieve a balance in terms of rigidity and toughness, and the rheological properties are poor, and processing is relatively difficult. Therefore, conventional copolymerization modification has been unable to meet the needs of some situations. need
The processing fluidity, chemical stability, pressure resistance and other comprehensive properties of propylene resin can be improved by polymer blending, but it needs to add a blending compatibilizer, and most of the blending modifiers are EPDM, POE, EP and other elastic The addition amount is relatively large, most of which exceed 10%. Although the toughness and low-temperature impact strength of the blend system are improved, the rigidity, strength and other properties of the material will be significantly reduced.

Method used

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  • Propylene copolymer and preparation method thereof
  • Propylene copolymer and preparation method thereof
  • Propylene copolymer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The propylene copolymer of this embodiment includes repeating units having a structure of formula (I) and repeating units having a structure of formula (II);

[0049]

[0050] Among them, n is between 40 and 65;

[0051] The ethylene branches of the propylene copolymerization are on the same side.

[0052] The propylene copolymer is prepared by the following method,

[0053] 1) Under anhydrous and oxygen-free conditions, using toluene as a solvent, after treating the reactor and solvent with diethylaluminum chloride, at a polymerization temperature of 100°C and an ethylene pressure of 16MPa, the ethylene monomer is in component A The polymerization reaction was carried out under the metal catalyst system for 19 minutes, and the obtained ethylene oligomer was a vinyl-terminated macromonomer, wherein the molar fraction of the above-mentioned vinyl macromonomer in the obtained ethylene oligomer was greater than 95 %, the number-average molecular weight of the vinyl ma...

Embodiment 2

[0066] The propylene copolymer of this embodiment includes repeating units having a structure of formula (I) and repeating units having a structure of formula (II);

[0067]

[0068] Among them, n is 50-70;

[0069] The ethylene branches of the propylene copolymerization are on the same side.

[0070] The propylene copolymer is prepared by the following method,

[0071] 1) Under anhydrous and oxygen-free conditions, using toluene as a solvent, after treating the reactor and solvent with diethylaluminum chloride, at a polymerization temperature of 70°C and an ethylene pressure of 20MPa, the ethylene monomer is in component A Under the metal catalyst system, the polymerization reaction was carried out for 30 minutes, and the obtained ethylene oligomer was a vinyl-terminated macromonomer, wherein the molar fraction of the above-mentioned vinyl macromonomer in the obtained ethylene oligomer was greater than 93 %, the number-average molecular weight of the vinyl macromer is at...

Embodiment 3

[0084] The propylene copolymer of this embodiment includes repeating units having a structure of formula (I) and repeating units having a structure of formula (II);

[0085]

[0086] Among them, n is 40-60;

[0087] The ethylene branches of the propylene copolymerization are on the same side.

[0088] The propylene copolymer is prepared by the following method,

[0089] 1) Under anhydrous and oxygen-free conditions, after treating the reactor and solvent with triisobutylaluminum, at a polymerization temperature of 60°C and an ethylene pressure of 30MPa, the ethylene monomer is polymerized under the metal catalyst system of component A After reacting for 60 minutes, the vinyl oligomer obtained is a vinyl-terminated macromonomer, wherein the vinyl macromonomer obtained above accounts for more than 95% of the molar fraction of the obtained vinyl oligomer, and the vinyl macromolecule The number average molecular weight of the monomer is 700g / mol, the molecular weight distribu...

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Abstract

The invention discloses a propylene copolymer and a preparation method thereof. According to the method, a vinyl macromonomer is prepared from a first component catalyst system; polymeric propylene and the vinyl macromonomer are copolymerized through catalysis of a second component catalyst system to obtain the propylene copolymer. On the basis of retaining the excellent mechanical properties, thermal properties, chemical stability and electrical insulating properties of polypropylene, the propylene copolymer has the advantages of controllable molecular weight and structure, high impact resistance, high melt strength, good rheological property in processing and the like, so that acrylic resin is conveniently further processed and applied, and conditions are provided for wide application ofthe novel material.

Description

technical field [0001] The invention relates to the technical field of preparation of propylene copolymers, in particular to a propylene copolymer and a preparation method thereof. Background technique [0002] Polypropylene is a semi-crystalline thermoplastic non-polar polymer material with low density and strong solvent resistance. Compared with ethylene, its mechanical properties are higher in strength, hardness, stiffness and gloss. The annual output exceeds 50 million tons per year. It is one of the important materials of the four pillar industries of the national economy, the automobile industry, building materials and home appliances, electronics and petrochemicals. It has become one of the most widely used general-purpose plastics in the world. However, the overall properties of polypropylene, such as impact resistance, toughness, dimensional stability, and long-term heat and pressure resistance, are usually not enough. Therefore, blending or copolymerization modific...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F210/16C08F210/02C08F2/00C08F4/02C08F4/64C08F4/6592
Inventor 李悦生杨飞潘莉马哲王彬
Owner TIANJIN UNIV
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