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A kind of preparation method of high melt strength polypropylene

A technology with high melt strength and polypropylene, applied in the field of polypropylene, can solve problems such as narrow application range, achieve low crosslinking degree, simple process, and avoid a large amount of degradation

Active Publication Date: 2018-10-02
SINOPEC YANGZI PETROCHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can only be used for polypropylene with a high amount of ethylene copolymerization, and the scope of application is very narrow.

Method used

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  • A kind of preparation method of high melt strength polypropylene
  • A kind of preparation method of high melt strength polypropylene
  • A kind of preparation method of high melt strength polypropylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The twin-screw extruder used in this embodiment is a co-rotating twin-screw extruder with a screw diameter of 30 mm and a length-to-diameter ratio of 52.

[0035] 3 parts of styrene, 1.25 parts of benzoyl peroxide, 0.5 parts of triallyl cyanurate, 0.2 parts of β-(4-hydroxy-3,5-di-tert-butylphenyl)propionic acid Add n-octadecyl alcohol ester and 0.4 part of (2,4-di-tert-butylphenyl)phosphite triester into 3 parts of acetone and stir and mix thoroughly to obtain a mixture of additives. Add 100 parts of homopolypropylene powder with a melt flow rate of 0.2g / 10min into a medium-speed mixer, and in the presence of an inert gas, spray the above-mentioned mixture on the surface of the polypropylene powder several times. Finally, it is used as a mixture after thorough mixing.

[0036] The above compound is added into a twin-screw extruder for extrusion granulation. The extrusion temperature of the twin-screw extruder was 210°C. The speed of the main machine is 80rpm, the fee...

Embodiment 2

[0039] The twin-screw extruder used in this embodiment is a co-rotating twin-screw extruder with a screw diameter of 30 mm and a ratio of length to diameter of 46.

[0040] The rest are basically the same as in Example 1, but the polypropylene is changed to a homopolypropylene with a melt flow rate of 2g / 10min, and the extrusion temperature of the twin-screw extruder is changed to 190°C.

[0041] Auxiliary formula changed to:

[0042]

[0043] The melt flow rate of the obtained high melt strength polypropylene was 3.6 g / 10 min, the melt strength was 23 cN, and the degree of crosslinking was 0.5%. Ordinary polypropylene with the same melt flow rate has a melt strength of 3.5 cN.

Embodiment 3

[0045] The twin-screw extruder used in this embodiment is a co-rotating twin-screw extruder with a screw diameter of 30 mm and a ratio of length to diameter of 56.

[0046] All the other are basically the same as in Example 1, but the polypropylene is changed into 10% of ethylene copolymerization amount, the melt flow rate is the copolymerized polypropylene of 10g / 10min, and the extrusion temperature of twin-screw extruder is changed into 180 ℃.

[0047] Auxiliary formula changed to:

[0048]

[0049] The melt flow rate of the obtained high melt strength polypropylene was 8.4 g / 10 min, the melt strength was 13.7 cN, and the degree of crosslinking was 0.3%. The melt strength of ordinary polypropylene with the same melt flow rate is 0.95cN.

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Abstract

The present invention relates to a high melt strength polypropylene preparation method, wherein polypropylene, a branched accelerator, a third monomer and a cross-linking antioxidant with a 1 min half-life temperature of less than 135 DEG C are subjected to a grafting reaction in a semi-molten state through a twin screw extruder so as to obtain the high melt strength polypropylene. Compared with other melt blending methods, the method of the present invention has the following characteristics that the polypropylene raw material is initiated to be subjected to the chemical reaction adopting the grafting reaction as the main in the semi-molten state at the temperature close to the melting point so as to easily form the long chain branched polypropylene and avoid the substantial degradation of the polypropylene. According to the present invention, the method has the simple process and is suitable for industrial scale manufacturing, the melt strength of the obtained high melt strength polypropylene is significantly increased compared with the melt strength of the ordinary polypropylene at the same melt flowing rate, and the cross-linking degree is less than 2%.

Description

technical field [0001] The invention relates to a preparation method of high melt strength polypropylene, which belongs to the technical field of polypropylene. Background technique [0002] Polypropylene is one of the most promising thermoplastic polymer materials. Compared with other general-purpose thermoplastics, polypropylene has the characteristics of low density, non-toxicity, easy processing, good mechanical properties, wide source of raw materials, and low price. It is widely used in automobiles, household appliances, electronics, packaging and building materials and furniture and other fields. However, most of the polypropylene obtained by coordination-catalyzed polymerization has a linear long-chain structure, showing a partially crystalline state, and its softening point is very close to the melting point. When the temperature exceeds the melting point, its melt strength decreases rapidly, resulting in its melt. The disadvantages of low strength and poor sag re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F255/02B29B9/06B29C47/92B29C48/92
Inventor 左胜武傅勇邱敦瑞徐振明袁小亮
Owner SINOPEC YANGZI PETROCHEM
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