Method for preparing aromatic polyurea porous membrane

An aromatic and porous membrane technology, which is applied in the field of preparation of aromatic polyurea porous membranes, can solve the problems of acid and alkali resistance, poor solvent resistance, intolerance to γ-ray irradiation, and low water flux, and achieve mechanical properties and excellent thermal stability

Inactive Publication Date: 2005-04-06
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first is cellulose acetate porous membrane, which has poor acid and alkali resistance, solvent resistance, and gamma-ray radiation resistance, so its application is narrow
The second is the polypropylene porous membrane. Since the membrane is made by spinning by melt stretching method, the porosity of the membrane is low, usually not more than 60%, and the water flux is low.
The third is the polysulfone porous membrane, which has poor resistance to aromatic solvents and halogenated hydrocarbon solvents, and cannot be used to treat liquids containing these solvents, and when it is used for a long-term treatment liquid containing surfactants, it is easy to cause a decrease in membrane strength and deformation issues
The fourth is polyvinylidene fluoride porous membrane. Although it has strong acid and alkali resistance, γ-ray resistance, and organic solvent resistance (such as strong oxidants, halogenated hydrocarbons, aliphatic hydrocarbons, etc.), it can produce high-quality polyvinylidene fluoride hollow fibers. Porous membranes are more difficult
The fifth is polytetrafluoroethylene porous membrane, which has excellent heat resistance and chemical resistance, but this kind of membrane needs to be laminated in multiple layers so that it will not be damaged in long-term use, and the laminated layers make the processing process complicated
Aromatic polyurea can be formed into a porous membrane by wet forming, and its preparation method has not been reported yet

Method used

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  • Method for preparing aromatic polyurea porous membrane
  • Method for preparing aromatic polyurea porous membrane
  • Method for preparing aromatic polyurea porous membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 14

[0030] Embodiment 14,4'-diisocyanate diphenylmethane (MDI)

[0031] 5.0 grams of 4,4'-diisocyanate diphenylmethane (0.02mol) and 28 grams of dimethylacetamide solutions that are dissolved with 1.08 grams of m-phenylenediamine (0.01mol) are successively added in a 250ml three-necked flask, 2 Pre-polymerization was carried out with mechanical stirring. The prepolymerization temperature is controlled at about 55°C, and the prepolymerization is carried out for 30 minutes to obtain a prepolymer with NCO groups at both ends of the molecule.

[0032] Then, a solution of 12 grams of dimethylacetamide dissolved with 1.08 grams of m-phenylenediamine (0.01 mol) was gradually added into the three-necked flask for chain extension reaction. At this time, NCO / NH in the system 2 The molar ratio is 1:1. Stirring was continued at 55° C. for 2 hours to obtain a light yellow transparent viscous polyurea solution with a total solid content of about 16%. Diethylamine was added to block ...

Embodiment 2

[0036] The operation steps are the same as in Embodiment 1. Change the NCO / NH in the reaction system 2 The molar ratio is 1.075:1. The intrinsic viscosity of the obtained product is 0.56dL / g, the breaking strength is 44MPa, the breaking elongation is 7%, and the elastic modulus is 1262MPa; the thermal degradation temperature is about 220°C.

Embodiment 3

[0038] Operation steps are identical with embodiment 1. Change the NCO / NH in the reaction system 2 The molar ratio was 1.2:1, and the polymerization temperature was 60°C. The intrinsic viscosity of the obtained product was 0.42 dL / g, the breaking strength was 68 MPa, the breaking elongation was 17%, and the elastic modulus was 1077 MPa.

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Abstract

The invention disclosesone aromatic polyuria porous membrane preparing method, including following steps: Carries on the solution polymerization to aromatic two ammonium and the aromatic two isocyanogens diethylene glycol dinitrate in organic solvent under inert atmosphere, spreads the polymer solution blows on the plate, plunges peptizer the bath or drying, coagulates it to the thin film, takes out the remaining solvent, obtains the aromatic polyuria porous membrane.the aromatic polyuria porous membrane preparated by using this invention method, the machine capability and the heat-stable performance is extremely outstanding, can be widely applied to preparate the industry pure water and the ultra pure water, the water desalinization, and softens the pharmaceutical industry and the medical industry, the food industry, the metallurgical industry,sewage treatment in the environment projects and recircling so on domains.

Description

technical field [0001] The invention relates to a preparation method of an aromatic polyurea porous membrane. Background technique [0002] Since the 1970s, the development of functional membranes has been very rapid. The main varieties are regenerated cellulose, cellulose ester, polyamide, polyvinylidene fluoride, polytetrafluoroethylene, polypropylene, polyvinyl chloride and so on. In recent years, functional membrane technology has achieved further development, widely used in the preparation of industrial pure water and ultrapure water, water desalination and softening, pharmaceutical industry and medical industry, food industry, metallurgical industry, sewage in environmental engineering processing and reuse and many other fields. [0003] There are five main types of porous membranes currently used for various filtration or dialysis. The first is cellulose acetate porous membrane, which has poor acid and alkali resistance, solvent resistance, and gamma-ray irradiation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/54
Inventor 陈大俊李雪莲周金荣罗伟强张清华
Owner DONGHUA UNIV
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