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Polypropylene alloy and preparation method thereof

A polypropylene and random polypropylene technology, applied in the field of polypropylene alloys and their preparation, can solve the problems of decreased rigidity, difficulty in taking into account the rigidity and toughness of alloys at the same time, achieve high flexural modulus, reduce product costs, and simplify process flow Effect

Active Publication Date: 2007-11-28
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the introduction of the data, the key problem in the preparation of polyolefin alloys with ethylene and propylene as the main raw materials is that it is difficult to balance the rigidity and toughness of the alloy at the same time.
When toughening polypropylene with EPR, increasing toughness always leads to a decrease in stiffness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) Pre-polymerization process

[0017] Preliminary polymerization was carried out on a 5L bulk polymerization evaluation apparatus. Firstly, the reaction system was evacuated for 5 times with high-purity nitrogen, and then replaced with propylene for 3 times. Add molecular weight modifier 100mmol in the system, with the Ziegler-Natta spherical catalyst 20mg of activation (main composition has: titanium content is 2.5%, chlorine 58%, magnesium 15%, diester or diether 14.0%, particle diameter 20~150μ Spherical particles), cocatalyst Al(C 2 h 5 ) 3 (the molar ratio of the aluminum in the cocatalyst to the titanium in the Zeigler-Natta catalyst is 1000), the external electron donor diphenyldimethoxysilane, (silicon in the diphenyldimethoxysilane and the Zeigler-Natta catalyst The molar ratio of titanium is 100), add in the catalyst feed tank. The catalyst is flushed into the reaction system with liquid propylene, and the amount of propylene added is 1300 g. The react...

Embodiment 3、4、5、6、7、8

[0023] In Examples 3, 4, 5, 6, 7, and 8, the catalyst ratio is a homogeneous single titanocene catalyst 1-phenyl-2,3,4,5-tetramethylcyclopentadienyl-(2, The weight ratio of 4,6-tri-tert-butylphenoxy)-titanium dichloride to Ziegler-Natta catalyst (industrial DQ-2) is 1:1.5; 1:4; 1:6; 1:8; 1 : 10; 0: 1, the molecular weight modifier hydrogen is fixed at 100mmol, and other operating conditions are exactly the same as in Example 1, and the results are listed in Table 1.

[0024] Example

[0025] From the results of propylene polymerization catalyzed by catalysts with different proportions, the impact performance of the polymer decreases with the decrease of the metallocene catalyst addition. This is because the high molecular weight random polypropylene in the polymer The content is reduced; compared with pure isotactic polypropylene, the impact strength is increased by 2-4 times.

Embodiment 9、10、11、12、13、14、15

[0027] In Examples 9, 10, 11, 12, 13, 14, 15, the fixed catalyst ratio is 1-phenyl-2,3,4,5-tetramethylcyclopentadienyl-(2,4,6 -tri-tert-butylphenoxy group)-titanium dichloride catalyst and Ziegler-Natta catalyst weight ratio are 1: 4, the add-on of molecular weight modifier hydrogen is respectively 0,60,100,130,160,200,260mmol, Other operating conditions are identical with embodiment 1, and the results are listed in table 2.

[0028] Example

[0029] From the results of the examples, as the amount of hydrogen added increases, the melt flow index of the polymer increases, the average molecular weight decreases, the improvement of the impact resistance of the polymer gradually decreases, and the impact performance of low-index products increases. Very large, the hydrogen tuning sensitivity of the alloy catalyst system is very good.

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PUM

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Abstract

The present invention relates to one kind of polypropylene alloy and its preparation process. The polypropylene alloy is prepared with propylene monomer, Ti, Cl, Mg, diester or diether in certain weight proportion, and through bulk polymerization after adding supported spherical catalyst and composite co-catalyst at 40-80 deg.c and 1.0-4.0 MPa for 1-2hr; and further polymerization after adding monocyclopentadiene Ti or Zr homogeneous catalyst and composite co-catalyst for other 1-3 hr to obtain spherical granular product. The polypropylene alloy has high bending modulus and high impact strength.

Description

technical field [0001] The invention relates to a polypropylene alloy and a preparation method thereof. Background technique [0002] Polypropylene (PP) alloy technology is a new technology developed in recent years. PP alloy products have the characteristics of matching rigidity and toughness, which can be realized through blending modification and catalytic polymerization. Blending modified PP alloys, such as PP / PE, PP / EPR, PP / PA and other systems, must go through a complex blending process, and due to the limitation of the degree of dispersion of the system, its comprehensive performance is affected (Blom H.P., Teh J.W. , Rudin A., J.Appl.Polym.Sci., 1995, 58(8): 995), and the cost is relatively high. Catalytic alloy technology was born with the development of catalyst technology. The direct synthesis of PP alloy in the reactor greatly improves the performance, and the production cost is much lower than that of blending technology. Catalytic alloy technology has become t...

Claims

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Application Information

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IPC IPC(8): C08L23/12C08F10/06C08F4/645
Inventor 郎笑梅母瀛赵成才李欣李金才付义吕春胜张铭辉邹恩广赵增辉王淑英于晓冰姚金霞滕海英柏晓红
Owner PETROCHINA CO LTD
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