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Preparation method of high-melt strength polypropylene resin with long-chain branched structure characteristic

A high-melt-strength, polypropylene resin technology, applied in the field of preparation of high-melt-strength polypropylene resin, can solve the problems of high cost, practicability to be improved, and low melting point of polymers, and achieve strong strain hardening effect, melting The effect of improved body elasticity and high melt strength

Active Publication Date: 2014-05-21
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although metallocene catalysts have good copolymerization ability, their practicability needs to be improved due to the high cost of metallocene catalysts and cocatalysts and the low melting point of polymers.

Method used

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  • Preparation method of high-melt strength polypropylene resin with long-chain branched structure characteristic
  • Preparation method of high-melt strength polypropylene resin with long-chain branched structure characteristic
  • Preparation method of high-melt strength polypropylene resin with long-chain branched structure characteristic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Before the polymerization starts, use high-purity nitrogen (nitrogen purity 99.99%) to replace the air and traces of water in the polymerization reactor, and inject H into the 2L polymerization reactor at normal temperature and pressure. 2 , so that the H in the polymerization reactor 2 The pressure is 0.05MPa, then sequentially add 250g of liquid propylene, 4ml of TEA solution and 14.7mg of the Ziegler-Natta catalyst prepared above, and then add 200g of liquid propylene to rinse the addition funnel to ensure that the Ziegler-Natta catalyst is completely added to the polymerization In the reaction kettle, after the feeding is completed, raise the temperature to 70°C for propylene homopolymerization for 12 minutes, and obtain a mixed solution containing a linear polypropylene resin with a linear structure in the polymerization reaction kettle; then add 55.15 mmol of 1,9-decadiene Monomer, at a temperature of 70°C, polymerize the unpolymerized liquid propylene and 1,9-dec...

Embodiment 2

[0074] Before the polymerization starts, use high-purity nitrogen (nitrogen purity 99.99%) to replace the air and traces of water in the polymerization reactor. In a 500ml dry polymerization reactor, first add 50ml of dry n-hexane, and then add the concentration of 1ml of 1.8mol / L triethylaluminum, and 24.8mg of the above-prepared Ziegler-Natta catalyst; then feed propylene gas, under the pressure of 0.4MPa, carry out the polymerization reaction at 60°C for 30 minutes, then vent the polymerization The pressure in the reaction kettle reaches an atmospheric pressure, and a linear polypropylene resin with a linear structure is obtained in the polymerization reaction kettle; 5.52mmol of dry 1,4-pentadiene monomer is added, propylene gas is introduced, and then the pressure of 0.4MPa At a temperature of 60°C, polymerize propylene monomer and 1,4-pentadiene monomer for 5 minutes to generate long-chain branched and partially cross-linked copolymerized polypropylene. After the polymeri...

Embodiment 3

[0077] Before the polymerization starts, use high-purity nitrogen (nitrogen purity 99.99%) to replace the air and traces of water in the polymerization reactor. In a 500ml dry polymerization reactor, first add 50ml of dry n-hexane, and then add the concentration of 1ml of 1.8mol / L triethylaluminum, and 24.6mg of the above-prepared Ziegler-Natta catalyst; then feed propylene gas, under the pressure of 0.4MPa, carry out the polymerization reaction at 60°C for 30 minutes, then vent the polymerization The pressure in the reaction kettle reaches one atmospheric pressure, obtains the linear polypropylene resin with linear structure in the polymerization reaction kettle; Add 16.56mmol dry 1,4-divinylbenzene monomer, pass into propylene gas, then in 0.4MPa Under pressure, at a temperature of 60°C, polymerize propylene monomer and 1,4-divinylbenzene monomer for 5 minutes to generate long-chain branched and partially cross-linked copolymerized polypropylene. After the polymerization reac...

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Abstract

The invention relates to a preparation method of high-melt strength polypropylene resin with long-chain branched structure characteristic. According to the preparation method, polymerization reactions are carried out section by section based on MgCl2 / TiCl4 type high-efficiency Ziegler-Natta catalysts. The preparation method comprises the following steps of carrying out propylene homo-polymerization, generating a homo-polypropylene matrix framework-linear polypropylene resin matrix, introducing alpha, omega-alkadiene monomer to carry out copolymerization, generating co-polypropylene in which the long chain is branched and some parts are interlinked, and evenly dispersing the co-polypropylene in which the long chain is branched and some parts are interlinked into a linear polypropylene resin-based polypropylene resin body to obtain the high-melt strength polypropylene resin with the long-chain branched structure characteristic. The preparation method is simple in polymerization technique, the high-melt strength polypropylene resin with the long-chain branched structure characteristic has good particle morphology, and the polymer melt has relatively strong strain hardening effect once being stretched.

Description

technical field [0001] The invention relates to a preparation method of high-melt strength polypropylene resin with long-chain branched structure characteristics. Background technique [0002] At present, the demand for polypropylene (PP) resin ranks second among all synthetic plastics worldwide, and it is widely used. Compared with other general-purpose thermoplastics, PP has the characteristics of low density, non-toxicity, easy processing, good mechanical properties and chemical stability. However, due to the inherent characteristics of the propylene coordination polymerization reaction, when Ziegler-Natta catalysts and metallocene catalysts are used for propylene polymerization, most of the linear structure polypropylene is obtained, and its softening point and melting point are close, and its melt strength drops rapidly after exceeding the melting point. , resulting in low melt strength and poor sag resistance. During extensional flow, the melt cannot exhibit strain ha...

Claims

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Application Information

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IPC IPC(8): C08L23/12C08L23/14C08L47/00C08F110/06C08F210/06C08F236/20C08F2/02C08F2/06C08F4/649
CPCC08F210/06C08L23/145C08L2205/025C08L2314/02C08F236/20C08F212/36C08F4/6494
Inventor 董金勇师建军秦亚伟牛慧
Owner INST OF CHEM CHINESE ACAD OF SCI
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