Method for synthesizing special resin for polypropylene cast film

A polypropylene casting and synthesis method technology, which is applied in the field of synthetic resins, can solve problems such as large fluctuations in product quality and difficulties in long-term production of polypropylene devices, and achieve excellent physical and mechanical properties, compoundability and anti-blocking properties , The effect of improving processability and performance

Active Publication Date: 2012-05-30
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high ethylene content, long-term production of polypropylene plants is very difficult and the product quality fluctuates greatly

Method used

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  • Method for synthesizing special resin for polypropylene cast film
  • Method for synthesizing special resin for polypropylene cast film
  • Method for synthesizing special resin for polypropylene cast film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (device load 6t / h): The main catalyst (120g / h), triethylaluminum (840g / h) and electron donor (105g / h~840g / h) are in the pre-contact tank D2201 at about 10 ℃, fully Stir to mix to form a complex. The complex compound overflowed from D2201 is mixed with cold propylene (20°C) (6t / h) in Z2203 (inline mixer) and then enters the prepolymerization reactor R2200, at 20°C, 3.4Mpa pressure, the reaction After about 4 minutes, it enters a loop reactor R2201, and at the same time, ethylene (about 116kg / h) and hydrogen gas with a controlled molecular weight are input into a loop reactor R2201, and the polymerization reaction is carried out in a loop reactor. The operating temperature is 70°C, the pressure is 3.4Mpa, a part of propylene is polymerized, and the remaining liquid propylene is used as the flow carrier of the solid polymer, and the slurry concentration is controlled at 50-55%wt. The slurry, propylene and ethylene (116kg / h) and hydrogen from the boundary zone from R2201 e...

Embodiment 2

[0040] (Device load 6t / h): The main catalyst (150g / h), triethylaluminum (1140g / h) and electron donor (142.5g / h~1140g / h) are in the pre-contact tank D2201 at about 10°C, Stir well to mix to form a complex center. The complex compound overflowed from D2201 is mixed with cold propylene (20°C) (6t / h) in Z2203 (inline mixer) and then enters the prepolymerization reactor R2200. At 20°C and 3.4Mpa pressure, the reaction After about 4 minutes, it enters a loop polymerization reactor R2201, and at the same time, ethylene (about 116kg / h) and hydrogen gas with a controlled molecular weight are input into a loop polymerization reactor R2201, and the polymerization reaction is carried out in a loop polymerization reactor. The operating temperature is 70°C, the pressure is 3.4Mpa, a part of propylene is polymerized, and the remaining liquid propylene is used as the flow carrier of the solid polymer, and the slurry concentration is controlled at 50-55%wt. The slurry, propylene and ethylene ...

Embodiment 3

[0043] (Device load 6t / h): The main catalyst (180g / h), triethylaluminum (1440g / h) and electron donor (180~1440g / h) are fully stirred and mixed in the pre-contact tank D2201 at about 10°C form a complexing center. The complex compound overflowed from D2201 is mixed with cold propylene (20°C) (6t / h) in Z2203 (inline mixer) and then enters the prepolymerization reactor R2200. At 20°C and 3.4Mpa pressure, the reaction After about 4 minutes, it enters into a loop polymerization reactor R2201, and at the same time, ethylene (about 116kg / h) and hydrogen with a controlled molecular weight are input into a loop polymerization reactor R2201, and the polymerization reaction is carried out in a loop polymerization reactor. The operating temperature is 70°C, the pressure is 3.4Mpa, a part of propylene is polymerized, and the remaining liquid propylene is used as the flow carrier of the solid polymer, and the slurry concentration is controlled at 50-55%wt. The slurry, propylene and ethylen...

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Abstract

The invention relates to a method for synthesizing special resin for a randomly copolymerized polypropylene cast film. A second generation domestic loop pipe polypropylene device is used for synthesis, CS-2 catalyst / propylene is 0.02-0.03 g / kg, and hydrogen gas and ethylene are uniformly added into two loop pipes; triethyl aluminum / propylene is 0.14-0.24 kg / t, triethyl aluminum / electron donor is 1-8 kg / kg, the densities of a first loop pipe polymerization reactor and a second loop pipe polymerization reactor are controlled at 530-580 kg / m<3>, the concentration of hydrogen gas is controlled at1200-1500 ppm, ethylene / propylene is 18-20 kg / t, and the melt flow rate of powder is 11-14 g / 10 min; additives comprise an antioxidant, a neutralizing agent, an antiblocking agent and a slipping agent; the melt flow rate value of a product is 6-9 g / 10 min, and the content of ethylene is 3.6-4.0%.

Description

technical field [0001] The invention relates to a method for synthesizing special resin for random copolymerized polypropylene cast film with high ethylene content, and belongs to the field of synthetic resins. Background technique [0002] Polypropylene cast film (CPP) is a non-stretched, non-oriented flat extrusion film produced by melt casting and quenching. It is widely used in the packaging of textiles, flowers, food, and daily necessities. CPP film production requires the use of special resins, and the resins must have certain melt fluidity and melt tension. Generally, the melt flow rate (MFR) of resins is required to range from 6 to 12g / 10min, which can be divided into two categories: homopolymers and copolymers. . Random copolymerized polypropylene casting film special material with high ethylene content is mainly used for heat sealing film or cooking film due to its low melting point and good impact performance. Due to the high ethylene content, long-term producti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F210/16
Inventor 王云红徐文清肖江张保军刘继新金丽晓
Owner PETROCHINA CO LTD
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