Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation method of anti-impact polypropylene in-reactor alloy

An alloy and polypropylene technology in a kettle is applied in the field of preparation of alloys in an impact-resistant polypropylene kettle, which can solve the problems that have not yet been seen, and achieve the characteristics of not easy to agglomerate and stick to the kettle, good rigidity-toughness balance, and rigidity-toughness balance. The effect of feature improvement

Active Publication Date: 2014-02-12
CHINA PETROLEUM & CHEM CORP +1
View PDF3 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no report on the five-component catalytic system composed of supported titanium-based main catalyst, two kinds of alkylaluminum and two kinds of external electron donors and its application in the synthesis of polypropylene inner alloy

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of anti-impact polypropylene in-reactor alloy
  • Preparation method of anti-impact polypropylene in-reactor alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1 Preparation of impact-resistant polypropylene inner alloy by batch process

[0032] The reactor for preparing the inner alloy of the impact-resistant polypropylene is a steel pressure-resistant reactor with a mechanical stirring device and a temperature control jacket, and the volume of the reactor is 0.8 liters. There are gaseous monomer feed ports and valves on the bottom and cover of the reactor, and catalyst feed ports, pressure gauges and exhaust lines with pressure controllers are also located on the cover.

[0033] Before the reaction, the temperature of the kettle was raised to 100°C, and the kettle was evacuated for 2 hours through the catalyst feed port to remove moisture and air in the kettle, and then the temperature of the kettle was lowered to 20-50°C, and the stirring speed was adjusted to 300 rpm. Fill the polymerization grade propylene to 0.1~0.2MPa (absolute pressure, unless otherwise specified) through the gaseous monomer feed port of the ke...

Embodiment 2

[0038] In the cocatalyst of embodiment 2, Al(C 2 h 5 ) 3 and Al( i -C 4 h 9 ) 3 The molar ratio of the catalyst is 4:1, the main catalyst consumption is 68 mg, and all the other operating procedures and polymerization conditions are the same as in Example 1. The catalytic efficiency of the polymerization reaction was 2.14 kg polymer / g catalyst. The polymerization product is a free-flowing fine powder particle, and the ethylene content in the chain structural unit is 8.7%. The mechanical properties test results of the polymer products are listed in Table 1.

[0039]

Embodiment 8

[0058] Example 8 Preparation of Impact Resistant Polypropylene Kettle Alloy by Continuous Process

[0059] The reaction device for preparing impact-resistant polypropylene inner alloy by continuous process is composed of four reactors in series, of which the first two are steel pressure-resistant reactors with mechanical stirring devices, and the latter two are gas-phase fluidized bed reactors. Liquid propylene, hydrogen, main catalyst, co-catalyst and external electron donor continuously enter the first reactor at a fixed rate to carry out liquid-phase bulk polymerization of propylene. At the same time, the material in the first reactor flows out at a certain rate and enters the second reactor to continue the liquid-phase bulk polymerization of propylene. The material of the second reactor flows out at a certain rate and enters the third reactor. The pressure of the third reactor is lower than that of the second reactor, so most of the liquid propylene is vaporized in this r...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
diameteraaaaaaaaaa
flexural modulusaaaaaaaaaa
impact strengthaaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method of anti-impact polypropylene in-reactor alloy. The preparation method comprises the following steps: by using propylene and ethylene as monomers and a MgCl2 / ID / TiCl4 supported catalyst as a main catalyst, adding two different catalyst promoters, namely Al(C2H5)3 and Al (i-C4H9)3 and two different external electron donors, namely R<1>R<2>Si(OCH3)2 and R<3>R<4>Si (OCH3)2 in the initial polymerization stage so as to form a catalytic system, and carrying out subsection polymerization so as to prepare the anti-impact polypropylene in-reactor alloy. The prepared anti-impact polypropylene in-reactor alloy has excellent rigidity / toughness balance characteristic. Compared with a polymerization product prepared by adopting a conventional catalytic system taking Al(C2H5)3 as the catalyst promoter and a single R<1>R<2>Si(OCH3)2 as the external electrode donor, the anti-impact polypropylene in-reactor alloy has the advantages that the anti-impact strength is obviously improved, and the bending modulus is equivalent; the efficiency of the catalyst for polymerization reaction is higher than the efficiency achieved by a conventional method.

Description

technical field [0001] The invention relates to a preparation method of polypropylene resin, in particular to a preparation method of impact-resistant polypropylene inner alloy. Background technique [0002] Impact polypropylene tank alloys (polypropylene impact copolymers) are a class of high-performance polypropylene resins for a wide range of uses, with significantly higher toughness than conventional homopolypropylene resins. This kind of resin is usually prepared by a two-stage polymerization method with two tanks connected in series, that is, the liquid phase bulk polymerization of propylene is carried out in the first reactor, and then the material in the first reactor is removed from the propylene monomer and then transferred to the second reactor Internal ethylene-propylene gas phase copolymerization. The polypropylene resin obtained through this two-stage polymerization reaction is a multi-phase polymer material composed of a continuous phase of polypropylene and ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L23/16C08F110/06C08F4/649C08F4/646C08F2/38C08F2/02C08F2/06C08F210/16C08F2/34
CPCC08F110/06C08F210/16C08L23/12C08L23/14C08L2308/00C08L2314/02C08F4/6494
Inventor 笪文忠范志强屠嵩涛徐宏彬傅智盛
Owner CHINA PETROLEUM & CHEM CORP