Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Ti-Ni match as composite catalyst and its application in preparing branch polyethylene from ethylene

A technology of composite catalyst and nickel complex, which is applied in the field of titanium-nickel complex composite catalyst, can solve the problems of complex catalyst preparation, difficulty in popularization and use, and irregular product shape, and achieve good particle shape, polymerization reaction control, and polymerization reaction. easy effect

Inactive Publication Date: 2005-08-24
SUN YAT SEN UNIV
View PDF0 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation of this new type of catalyst is relatively complicated, and expensive MAO or boron compounds need to be used as cocatalysts, and the shape of the obtained product is irregular.

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1. Catalyst preparation:

[0024] 1-1: 10 g of microspherical SiO 2 (pore volume 1.5 ~ 2.0ml / g) in a tube furnace, through N 2 , heated to 600°C, dehydrated at constant temperature, and removed most of the bound hydroxyl groups. After cooling for 4 hours, the N 2 Discharge under protection, be placed in reaction bottle; Add 90ml heptane, under N 2 Under protection and stirring, add 2.5molAlEt 3 / L concentration of ZnCl 2 -AlEt 3 Hexane solution 5ml, maintain at 25-50°C for 30 minutes, vacuum-dry to remove heptane, and obtain pretreated SiO 2 .

[0025] 1-2: anhydrous MgCl 20.7g was placed in a reaction bottle and dissolved in 30ml THF and 1.5ml C 2 h 5 OH, heated to 70°C and stirred until completely dissolved to obtain the mother liquor; in N 2 Under protection, add 1-1 to prepare pretreated SiO 2 , react at 50-60°C for 2 hours; remove THF at a vacuum of 30-50kpa to only contain THF as 0.10-0.15 parts of the total weight of the active carrier, and obtain MgC...

Embodiment 2

[0032] In embodiment 1 step 1-2, after making mother liquor, add 0.2ml Ti(OBu) again 4 and pretreated SiO 2 Reaction, all the other conditions and operation are the same as embodiment one, and the prepared catalyst is polymerized under the same conditions. Under the above conditions, a low density polyethylene with a branching degree of 7.0, a density of 0.922 and a melting point of 123°C was obtained from a single ethylene polymerization. The catalytic efficiency is 6.5×10 4 gPE / mol(Ni+Ti·h).

Embodiment 3

[0034] With the 1.5gNiX in embodiment 1 step 1-4 2 L 1 Instead, use 1.0g NiX 2 L 2 , all the other conditions and operations are the same as in Example 1, and the prepared catalyst is polymerized under the same conditions as in Example 1.

[0035] Under the above conditions, from a single ethylene polymerization, a polyethylene with a branching degree of 3.0 and a density of 0.935 was obtained, with a melting point of 126.3°C; its catalytic efficiency was 1.6×10 5 gPE / mol(Ni+Ti) h.

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
melting pointaaaaaaaaaa
melting pointaaaaaaaaaa
melting pointaaaaaaaaaa
Login to View More

Abstract

A catalyst for preparing branched polyethylene from ethylene is composed of main catalyst prepared by carrying Ti compoud-Ni compound on the MgCl2 ZnCl2, or SiO2 and the co-catalyst which is composite alkylaluminium (AlEt2Cl-AlR3). It is prepared by dipping reaction.

Description

technical field [0001] The invention relates to a titanium-nickel complex composite catalyst and a method for preparing various branched polyethylenes from single ethylene. Background technique [0002] As we all know, the traditional Ziegler-Natta (Z-N) catalyst can only produce branched polyethylene with different densities from the copolymerization of ethylene and α-olefin; it is difficult to prepare branched polyethylene with different densities from a single ethylene. It is reported in the literature that the catalytic system prepared by using the diimine complexes of late transition metals Ni, Pd, etc. and methylaluminoxane (MAO) or boron compounds can synthesize various branched polyethylenes from a single ethylene. However, the preparation of this new type of catalyst is relatively complicated, and expensive MAO or boron compounds need to be used as cocatalysts, and the shape of the obtained product is irregular, so it is still d...

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 Patents(China)
IPC IPC(8): C08F4/80C08F10/02
Inventor 王海华林少全萧翼之张启兴
Owner SUN YAT SEN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com