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Powder for preparing polyethylene microporous membrane and its preparation method and application

A polyethylene microporous membrane and polyethylene technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of narrowing the application range of products, demanding polymerization conditions, destroying crystallinity, etc., and achieve molecular weight And the distribution can be adjusted, the effect of improving processing efficiency and high processing speed

Inactive Publication Date: 2017-07-14
SHANGHAI RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Living polymerization has no commercial application value because its molecular weight increases with the increase of polymerization time and the polymerization conditions are harsh. Therefore, this patent has no practical value
At the same time, the branches introduced by copolymerization with α-olefins are mainly short-chain branches, which will improve the elongation, tensile strength, toughness, etc. of the product, but also destroy the crystallinity, the melting point will drop significantly, and the application of the product will be reduced. scope

Method used

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  • Powder for preparing polyethylene microporous membrane and its preparation method and application
  • Powder for preparing polyethylene microporous membrane and its preparation method and application
  • Powder for preparing polyethylene microporous membrane and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-6

[0052] Preparation of polyethylene material A:

[0053] Preparation of Mg-Ti-based Ziegler-Natta catalysts: by preparing new eco-magnesium halides, reacting with electron donors, and reacting with titanium compounds (Ti:Mg=0.05) to form Mg-Ti-based Ziegler-Natta catalysts Cat1. For the specific preparation method, refer to the preparation of the catalyst in Example 1 of patent ZL200610116967.1.

[0054] Preparation of Mg-Ti Ziegler-Natta catalysts: magnesium halides react with alcohols to form magnesium compounds, magnesium compounds react with silicon compounds having at least one halogen group to form intermediates, intermediates react with titanium compounds (Ti:Mg =0.1) to form Mg-Ti Ziegler-Natta catalyst Cat2, the specific preparation method refers to the preparation of the catalyst in Example 1 of ZL200710042467.2.

[0055] Polymerization reaction: Heat a 2-liter stainless steel jacketed reactor to 100°C, vacuumize for 3 hours, add 2kg of refined high-purity sodium ch...

Embodiment 7-12

[0060] Preparation of polyethylene material B:

[0061] The single-site catalyst Cat3 was prepared by supporting pentamethyl-cyclopentadienyl titanium trichloride on triethylaluminum-modified magnesium chloride alcoholate. For the specific preparation method, refer to the first catalyst in Example 1a of patent ZL201210396049.4 Preparation of components.

[0062] The single-site catalyst Cat4 was prepared by loading rac-dimethylsilylbis(1-indenyl)zirconium dichloride on styrene-acrylic acid copolymer. For the specific preparation method, refer to the preparation of the first catalyst component in Example 1a of patent ZL201110355606.3.

[0063] Polymerization reaction: Heat 2 liters of stainless steel jacketed reactor to 100°C, vacuumize for 3 hours, add 1 liter of refined high-purity n-hexane after cooling, add catalyst and cocatalyst methyl aluminoxane, control Al:Ti in 100-150. Raise the temperature to 50°C, feed 0.5Mpa ethylene, and react for 4 hours. During the polymeriz...

Embodiment 13-23

[0067] A kind of powder material for preparing polyethylene microporous membrane:

[0068] The prepared polyethylene powder A and polyethylene powder B are mixed in a certain proportion to obtain a powder for preparing polyethylene microporous membrane. The results are shown in Table 3.

[0069] Table 3: A kind of powder for preparing polyethylene microporous membrane

[0070]

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Abstract

The invention relates to powder for preparing a polyethylene microporous membrane and its preparation method and application. The powder comprises, by weight, 1-99 parts of polyethylene A and the balance of polyethylene B. The polyethylene A has viscosity average molecular weight of 0.8 to 5 million, molecular weight distribution greater than 3 and branched chain content of 0 to 20%. The polyethylene B has viscosity average molecular weight of 0.5 to 2 million, molecular weight distribution of 1-3 and branched chain content of 0-10%. Compared with the existing powder, the powder provided by the invention has the characteristics of adjustable molecular weight and distribution, processing easiness and good product performances. In processing, a use amount of the solvent can be adjusted according to powder molecular weight and distribution so that a high processing rate is guaranteed and processing benefits are improved. The preparation method is simple, greatly improves processing performances in the preparation of a microporous membrane from ultra-high polyethylene, reduces a solvent use amount, reduces pollution, reduces a cost and has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of polymer material forming and processing, and relates to a powder for preparing polyethylene microporous membranes, a preparation method and application thereof. Background technique [0002] As a high-performance material, polyethylene microporous membrane has attracted extensive attention from industry and academia because of its broad application range, environmental protection, pollution-free and reusability. Microporous membrane can selectively realize the exchange, separation, purification, concentration and other processes of different components by using its own micropores and the properties of the material itself. It has been widely used in industrial and agricultural and domestic sewage treatment, seawater desalination, gas Liquid separation membrane and battery diaphragm and other fields. In the process of preparing microporous membranes, the two most important links are the selection of materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/08B01D71/26B01D67/00C08F210/16C08F210/08C08F210/14C08F4/645C08F4/646C08F4/6592
CPCB01D67/0002B01D71/26C08F210/16C08J5/18C08J2323/08C08J2423/08C08L23/0815C08L2203/16C08L2205/025C08L2314/02C08F4/645C08F4/6465C08F4/65925C08F210/08C08F2500/01C08F210/14C08F2500/03
Inventor 李建龙张振飞肖明威叶纯麟
Owner SHANGHAI RES INST OF CHEM IND
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