Method for preparing polypropylene with high melt strength

A high melt strength, polypropylene technology, applied in the field of polyolefins, can solve the problems of uneven product thickness, poor transparency, easy cracking, etc., and achieve the effects of increasing molecular weight, economical manufacturing cost, and improving melt strength

Active Publication Date: 2018-09-04
江苏鸿禾生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] ④ Blown film: Commonly used polymers are LDPE, LLDPE, HDPE. Ordinary polypropylene will wrinkle, uneven product thickness, easy to crack, poor transparency, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Propylene and α-olefins are used to remove impurities such as sulfur, oxygen, water and carbon monoxide.

[0035] at 23m 3 In the polymerization kettle, put 11.8m 3 Propylene, 0.74m 3 Butene-1, 110g hydrogen, and activator triethylaluminum 2500ml, DDS (diphenyldimethoxysilane) 150ml, high melt strength polypropylene catalyst (1,3 glycol ester electron donor type) Z-N catalyst system) 190g, copolymerization catalyst (diether electron donor type Z-N catalyst system) 40g, the temperature of the kettle is controlled at 68°C, the pressure inside the kettle is maintained at 2.8MPa, and the polymerization time is 3h. The reacted monomer and polypropylene are separated to obtain polypropylene powder without propylene and α-olefin, and then air is introduced to deactivate the polypropylene powder. Flash deactivation, open the lower valve of the flash tank, and pass through the screen with a vacuum After the powder is sucked into the storage tank, it is packaged into the wareh...

Embodiment 2

[0039] Propylene and α-olefins are used to remove impurities such as sulfur, oxygen, water and carbon monoxide.

[0040] at 23m 3 In the polymerization kettle, put 11.7m 3 Propylene, 0.89m 3Butene-1, 360g hydrogen, and accordingly add activator triethylaluminum 2000ml, DDS 150ml, high melt strength polypropylene catalyst (1,3 glycol ester electron donor type Z-N catalyst system) 180g, copolymerization catalyst (two Ether electron donor type Z-N catalyst system) 40g, the temperature of the kettle is controlled at 72°C, the pressure inside the kettle is kept at 3.2MPa, and the polymerization time is 2.5h. After the polymerization reaction is stopped, after the raw materials are recovered, the unreacted monomer and polypropylene are separated The polypropylene powder without propylene is obtained, and then air is introduced to deactivate the polypropylene powder. The flash deactivation is performed, and the lower valve of the flash kettle is opened, and the powder is sucked int...

Embodiment 3

[0044] Propylene and α-olefins are used to remove impurities such as sulfur, oxygen, water and carbon monoxide.

[0045] at 23m 3 In the polymerization kettle, put 11.3m 3 Propylene, 0.94m 3 Butene-1, 300g hydrogen, and accordingly add activator triethylaluminum 2000ml, DDS 180ml, high melt strength polypropylene catalyst (1,3 glycol ester electron donor type Z-N catalyst system) 160g, copolymerization catalyst (two Ether electron donor type Z-N catalyst system) 40g, the temperature of the kettle was controlled at 75°C, the pressure inside the kettle was maintained at 3.2MPa, and the polymerization time was 2.8h, after the polymerization reaction was stopped. After raw material recovery, the unreacted monomer and polypropylene are separated to obtain polypropylene powder without propylene, and then air is introduced to deactivate the polypropylene powder by flash deactivation, the lower valve of the flash tank is opened, and the The net uses vacuum to suck the powder into t...

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Abstract

The invention provides a method for preparing polypropylene with high melt strength. The method comprises the following steps of 1) raw material refining; 2) polymerization reaction; 3) flash evaporation deactivation and 4) filtration and packaging. The method for preparing the polypropylene with the high melt strength is an industrial grade method that in a batch liquid phase bulk polymerizationtechnology, a method of one step in situ is adopted to directly perform polymerization in a 12-23-cubic meter polymeric kettle to prepare polypropylene powder with the high melt strength.

Description

technical field [0001] The invention relates to the field of polyolefins in polymer plastics, in particular to an industrial-grade method for preparing high-melt-strength polypropylene powder through direct polymerization in a polymerization kettle using an in-situ one-step method. Background technique [0002] Polymer melt strength refers to the maximum stress that a polymer can withstand when it is stretched and deformed in a molten state. Polypropylene has low shear viscosity and low melt strength when molten, making it unsuitable for applications such as foam molding, blown film, extrusion coating, etc. At present, the methods for preparing high melt strength polypropylene in my country include: 1) blending method, such as blending polypropylene with ultra-high molecular weight polyethylene; 2) high-energy irradiation or peroxide grafted long-chain branched structure; 3) Functional modification after reaction extrusion, secondary granulation with screw extruder; 4) React...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F210/06C08F210/08C08F210/14C08F4/649C08F2/02
CPCC08F2/02C08F210/06C08F2500/05C08F210/08C08F4/6494C08F210/14
Inventor 陈剑平朱晓芹徐新颖沈立春韩华喜王树东
Owner 江苏鸿禾生物科技有限公司
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