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Preparation method of modified polyolefin non-woven membrane

A non-woven, polyolefin technology, used in textiles and papermaking, alkaline storage batteries, nanotechnology for materials and surface science, etc., can solve the problems of unstable performance, short service life and unstable performance of modified diaphragms , to achieve the effect of improving thermal stability and cycle stability, improving hydrophilicity, and improving hydrophilicity

Active Publication Date: 2018-04-13
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the silica coating on the silica-coated polyolefin diaphragm prepared by this method is easy to fall off, with unstable performance and short service life.
[0007] The modification technology of the existing polyolefin nonwoven diaphragm mainly focuses on the hydrophilic modification to improve its affinity with the nickel-metal hydride battery electrolyte and the liquid absorption capacity, but the process is complicated and the damage to the diaphragm is relatively large. Big
In addition, a small number of studies have used inorganic nanoparticles to modify polyolefin nonwoven diaphragms to improve their thermal stability, but the connection between inorganic nanoparticles and the diaphragm is not firm, and it is easy to fall off. On the one hand, the performance of the modified diaphragm is unstable. On the other hand, Will affect the performance and safety of Ni-MH batteries

Method used

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  • Preparation method of modified polyolefin non-woven membrane
  • Preparation method of modified polyolefin non-woven membrane
  • Preparation method of modified polyolefin non-woven membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Soak the polypropylene nonwoven diaphragm in ethanol for 2 hours; make 100g aqueous solution with 5g potassium persulfate and 0.05g sodium lauryl sulfate, pass high-purity nitrogen gas for 30min, then place the soaked polypropylene nonwoven diaphragm into the solution, continue to feed high-purity nitrogen gas, take it out after being treated at 80°C for 2 hours, and wash it with deionized water; add 5g of vinyltrimethoxysilane to 95g of deionized water and stir at room temperature for 12 hours to obtain a uniform and transparent Vinyl silica nanoparticle hydrosol, then add 10g of acrylic acid and 0.2g of ammonium persulfate into the vinylsilica nanoparticle hydrosol, stir evenly; put the treated polypropylene nonwoven separator into the above hydrosol After feeding high-purity nitrogen for 30 minutes, the temperature was raised to 50°C, and high-purity nitrogen was continuously fed, and the polymerization reaction was carried out for 4 hours; after the reaction, the pol...

Embodiment 2

[0027] Soak the polypropylene non-woven diaphragm in methanol for 4 hours; make 100 g of aqueous solution with 2 g of potassium persulfate and 0.3 g of sodium dodecylsulfonate, inject high-purity nitrogen for 30 min, and then place the soaked polypropylene non-woven diaphragm Put it into the solution, continuously feed high-purity nitrogen gas, treat it at 85°C for 3 hours, take it out, and wash it with deionized water; add 2g of vinyltriethoxysilane to 100g of deionized water and stir at room temperature for 15h to obtain a uniform Transparent vinyl silica nanoparticle hydrosol, then add 15g of methacrylic acid and 0.08g of cerium ammonium nitrate into the vinyl silica nanoparticle hydrosol, stir evenly; put the treated polypropylene nonwoven separator into In the above water sol, heat up to 80°C after feeding high-purity nitrogen for 30 minutes, continue feeding high-purity nitrogen, and polymerize for 3 hours; after the reaction, take out the polypropylene nonwoven diaphragm...

Embodiment 3

[0029] Soak the polyethylene nonwoven membrane in methanol for 2 hours; make 100g of aqueous solution with 8g potassium persulfate and 0.01g sodium dodecylbenzenesulfonate, inject high-purity nitrogen for 30min, and then soak the polyethylene nonwoven membrane The diaphragm is put into the solution, and high-purity nitrogen gas is continuously introduced, and it is taken out after being treated at 90°C for 1 hour, and washed with deionized water; 15g of vinyltriacetoxysilane is added to 100g of deionized water and stirred at room temperature for 18 hours to obtain Uniform and transparent vinyl silica nanoparticle hydrosol, then add 4g of acrylamide and 0.3g of ammonium persulfate into the vinyl silica nanoparticle hydrosol, and stir evenly; put the treated polyethylene nonwoven diaphragm into In the above hydrosol, the high-purity nitrogen gas was introduced for 30 minutes, then the temperature was raised to 50°C, and the high-purity nitrogen gas was continuously introduced, an...

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Abstract

The invention relates to a preparation method of a modified polyolefin non-woven membrane, and belongs to the technical field of high-polymer material modifying. The preparation method includes the steps: soaking the polyolefin non-woven membrane in methanol or ethyl alcohol, and transferring the soaked polyolefin non-woven membrane into potassium sulfate and aqueous surfactant solution to treat the membrane; stirring vinyl silane coupling agents in water to obtain ethenyl silicon dioxide nano-particle hydrosol, and adding to hydrophilic grafting monomers and initiating agents into the ethenylsilicon dioxide nano-particle hydrosol; transferring the treated polyolefin non-woven membrane into the ethenyl silicon dioxide nano-particle hydrosol to perform graft modification; taking out, cleaning and drying reacted membrane to obtain the modified polyolefin non-woven membrane. The modified polyolefin non-woven membrane prepared by the method has the advantages of good hydrophilcity, high liquid absorption speed and heat stability, large alkali absorption quantity and the like.

Description

technical field [0001] The invention relates to the technical field of polymer material modification, in particular to a method for preparing a modified polyolefin nonwoven diaphragm for a nickel-metal hydride battery. Background technique [0002] Ni-MH batteries (MH-Ni batteries) have many advantages, such as large specific energy, high specific power, high-rate discharge, long cycle life, no memory effect, no pollution, maintenance-free, safe and reliable, no environmental pollution, etc., so It has received widespread attention and has become one of the hot spots in the development of secondary batteries in various countries in the world. The battery separator is one of the basic materials that make up the battery. It is another important component of the battery besides the positive and negative electrodes and the electrolyte. It is called the "third electrode" of the battery. The battery separator used in nickel-metal hydride batteries must have the following properti...

Claims

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Application Information

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IPC IPC(8): D06M14/10D06M11/79B82Y30/00H01M2/14H01M2/16H01M10/30D06M101/20H01M50/403H01M50/417H01M50/443H01M50/489
CPCH01M10/30D06M11/79D06M14/10B82Y30/00D06M2101/20H01M50/403H01M50/411Y02E60/10
Inventor 杜辉陈照军孙德帅方龙姜鹏夏凯
Owner QINGDAO UNIV