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

Polyolefin catalyst

A polyolefin catalyst and catalyst technology, applied in the field of polyolefin catalysts, can solve problems such as the inability to prepare polyethylene films, achieve good performance, reduce costs, and reduce environmental pollution

Inactive Publication Date: 2015-09-02
WUXI YAOHUI TECH
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing polyethylene resins are not suitable for the preparation of polyethylene films by the biaxial stretching method, and the properties of polyethylene resins are largely determined by the catalyst used in its polymerization; therefore, the development of a new type of Catalysts become especially important

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 Construction

[0025] Below, the present invention will be described in detail in combination with specific embodiments, so that those skilled in the art can clearly define the protection scope of the present invention.

[0026] A polyolefin catalyst, the catalyst is composed of the following components: silicon dioxide, chromium oxide, titanium oxide, silicon fluoride and organic chromium. Catalysts that meet the following conditions have better catalytic effects: SiO 2 The content is greater than or equal to 85%, the Ti content is greater than or equal to 8%, and the Cr content is greater than or equal to 1%. The particle size is 20-50um (D50), and the activity is greater than or equal to 5000 times.

[0027] In order to prepare a catalyst meeting the above requirements, it can be prepared as follows:

[0028] (1) Place the Davsion957 carrier in an oven to dry, and the drying temperature is controlled below 200°C to remove a small amount of water in the carrier.

[0029] (2) After Davsio...

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

No PUM Login to View More

Abstract

The invention discloses a polyolefin catalyst. The polyolefin catalyst is composed of silicon dioxide, chromic oxide, titanium oxide, silicon fluoride and organic chromium. By means of addition of organic chromium in the formula of the traditional catalyst and change of technological parameters of the catalyst while being prepared, the catalyst disclosed by the invention has properties different from the common catalyst; polyethylene resin obtained by being catalyzed and polymerized through the catalyst can be used for making a polyethylene film through a bidirectional stretching method; due to the thinner thickness, the made polyethylene film can have same properties, even better properties, like the common film; and therefore, the purposes of reducing the cost and reducing environmental pollution are achieved.

Description

technical field [0001] The invention relates to a polyolefin catalyst, in particular to a chromium-based polyethylene catalyst. Background technique [0002] Polyethylene (referred to as PE) is a crystalline thermoplastic resin obtained by polymerization of ethylene. In industry, it also includes copolymers of ethylene and a small amount of α-olefin. Polyethylene is odorless, non-toxic, feels like wax, and has a melting point of 100-130°C. It has excellent low temperature resistance and can maintain good mechanical properties at -60°C, but the use temperature is 80-110°C; it has good chemical stability and can resist most acids and alkalis (not resistant to acids with oxidizing properties). Insoluble in common solvents at room temperature, low water absorption, excellent electrical insulation. [0003] The chemical structure, molecular weight, degree of polymerization and other properties of polyethylene are largely dependent on the polymerization method used. The method ...

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
IPC IPC(8): C08F10/00C08F4/651C08F4/646C08F4/02C08F110/02
Inventor 吴国元
Owner WUXI YAOHUI TECH