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Preparation method for polypropylene material special for transparent sheet

A transparent sheet, polypropylene technology, applied in the field of polypropylene, to achieve the effect of high rigidity, high heat resistance, good rigidity and toughness balance

Active Publication Date: 2015-03-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no relevant patent report on the direct production of polypropylene special materials for high-transparency sheets through the Hypol process polymerization device of Mitsui Oil & Chemical Company in China.

Method used

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  • Preparation method for polypropylene material special for transparent sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Add 100 parts of propylene monomer, 0.3 parts of TK catalyst, 0.3 parts of triethylaluminum and 0.1 parts of dimethyldimethoxysilane into the first liquid phase reactor for reaction, the reaction time is 0.5h, and the reaction temperature is 71°C , reaction pressure 2.9MPa, H 2 The mass ratio to propylene is controlled at 0.02‰; the obtained product then enters the second liquid phase reactor for reaction, closes the hydrogen feed valve, the reaction temperature is 65°C, the reaction pressure is 2.5MPa, and the reaction time is 0.8h. The obtained product continues to Enter the first gas-phase fluidized-bed reactor for reaction, the reaction temperature is 83°C, the reaction pressure is 1.8MPa, and the reaction time is 1.5h. The product obtained by the reaction in the first gas-phase fluidized-bed reactor enters the second gas-phase fluidized-bed reactor for reaction , the reaction temperature is 79°C, the reaction pressure is 1.2MPa, a small amount of hydrogen is added ...

Embodiment 2

[0040] Add 70 parts of propylene monomer, 0.2 part of ND catalyst, 0.3 part of triisobutylaluminum and 0.1 part of dimethyldimethoxysilane into the first liquid phase reactor for reaction, the reaction time is 1.0 h, and the reaction temperature is 75 ℃, reaction pressure 2.6MPa, H 2 The mass ratio to propylene is controlled at 0.03‰; the obtained product then enters the second liquid phase reactor for reaction, closes the hydrogen feed valve, the reaction temperature is 66°C, the reaction pressure is 2.5MPa, and the reaction time is 1.0h. The obtained product continues to Enter the first gas-phase fluidized-bed reactor for reaction, the reaction temperature is 80°C, the reaction pressure is 1.2MPa, and the reaction time is 1.0h. The product obtained by the reaction in the first gas-phase fluidized-bed reactor enters the second gas-phase fluidized-bed reactor for reaction , the reaction temperature is 85°C, the reaction pressure is 1.2MPa, a small amount of hydrogen is added a...

Embodiment 3

[0047] Add 90 parts of propylene monomer, 0.1 part of CDI catalyst, 0.2 part of NG catalyst, 0.1 part of triisobutylaluminum and 0.05 part of trimethylmethoxysilane into the first liquid phase reactor for reaction, and the reaction time is 0.8h , reaction temperature 68°C, reaction pressure 3.2MPa, H 2 The mass ratio to propylene is controlled at 0.02‰; the obtained product then enters the second liquid phase reactor for reaction, closes the hydrogen feed valve, the reaction temperature is 60°C, the reaction pressure is 3MPa, and the reaction time is 0.5h, and the obtained product continues to enter The first gas-phase fluidized-bed reactor reacts, the reaction temperature is 83°C, the reaction pressure is 1.8MPa, and the reaction time is 1.2h. The product obtained by the first gas-phase fluidized-bed reactor enters the second gas-phase fluidized-bed reactor for reaction. The reaction temperature is 81° C., the reaction pressure is 1.2 MPa, and a small amount of hydrogen is ap...

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Abstract

The invention relates to a preparation method for a polypropylene material special for a transparent sheet. The preparation method comprises the following steps: (1) adding a propylene monomer, a Ziegler-Natta catalyst, an organic aluminum compound and an organic silicone compound to a first liquid-phase reactor for reacting; (2) charging products obtained at the step (1) into a second liquid-phase reactor for reacting; (3) charging products obtained at the step (2) into a first gas-phase fluidized bed reactor for reacting; (4) charging products obtained at the step (3) into a second gas-phase fluidized bed reactor for reacting to obtain polypropylene; (5) pelleting obtained polypropylene at the step (4), adding a compound adjuvant system at the same time, and then discharging to obtain the polypropylene material special for the transparent sheet. The prepared polypropylene resin special for the high-transparency sheet has high rigidity (the flexural modulus is no less than 1400 MPa) and high heat resistance on the premise of keeping the certain toughness.

Description

technical field [0001] The invention relates to the field of polypropylene, in particular to a method for preparing a special polypropylene material for transparent sheets. The prepared special polypropylene material for transparent sheets is mainly used in high-end polypropylene heat-press-formed transparent containers. Background technique [0002] The development of domestic polypropylene thermoforming transparent containers started in 2000. In the past ten years, my country's PP thermoforming transparent containers have maintained a relatively high growth rate. According to incomplete statistics, in 2010, the total demand for polypropylene used in transparent sheets in my country has reached about 400,000 tons. Due to the insufficient supply of PP special materials for transparent sheets in the domestic market, most PP thermoforming transparent container manufacturers mainly use F401 or T30S as the base material and add transparent masterbatches for production by blendin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08F110/06
CPCC08F110/06C08K5/0083C08K5/13C08K5/372C08K5/524C08K5/526C08K5/5357C08K2201/014C08L2201/08C08L2201/10C08L2205/24C08L2314/02C08L23/12
Inventor 魏峰徐振明傅勇
Owner CHINA PETROLEUM & CHEM CORP
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