Preparation method of degradable forward osmosis membrane

A technology of forward osmosis membrane and membrane casting solution, which is applied in the field of osmosis membrane, can solve the problems of good durability, damage, large porosity, etc., and achieve the goal of reducing internal concentration polarization, increasing permeation flux, and improving compatibility Effect

Inactive Publication Date: 2018-09-21
威海惠高生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the lack of efficient FO membrane materials, the traditional FO support layer material polyester (PET) mesh or non-woven fabric is one of the mainstream materials for the current commercial FO support layer, which has high strength, large porosity, and good durability. advantage
However, PET is a petroleum-based non-degradable material, and its waste causes a burden and damage to the natural environment. In recent years, the frequent occurrence of marine fish and birds dying of plastic waste by mistake is worrying, which greatly restricts FO technology development of

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0023] The invention provides a method for preparing a degradable forward osmosis membrane, which specifically comprises the following steps:

[0024] A. After vacuum drying, the PHA homopolymer or copolymer with a volume crystallinity of 5-70% and the PLA homopolymer or copolymer with a volume crystallinity of 5-60% are subjected to physical examination in a ratio of 1:9 to 1:1. mix to form a mixture;

[0025] B. Inject the mixture into the extrusion equipment with a heating device for melting, and then use the melt-blown method to collect the melt-blown non-woven fabric at a spinning temperature of 176-225°C to obtain a degradable PLA substrate;

[0026] C. Prepare casting solution, which contains polymer and solvent, stir the polymer at 60°C for 6-9 hours to dissolve it in the solvent, let it stand for more than 24hr to completely defoam, and form a cast Membrane fluid;

[0027] Or stir the polymer at room temperature for more than 12 hours to dissolve it in the solvent, ...

Embodiment 1

[0040] After vacuum drying, the PHA homopolymer with a volume crystallinity of 45% and the PLA homopolymer or copolymer with a volume crystallinity of 60% are physically mixed in a ratio of 1:9 to form a mixture; the mixture is injected into a heating Melt in the extrusion equipment of the device, and then use the melt-blown method to collect melt-blown non-woven fabrics (i.e. degradable PLA substrates) at a spinning temperature of 180°C;

[0041] Step A and step B are the process of the self-made degradable PLA base material of the present invention.

[0042] Then adopt cellulose diacetate as polymer, add 12g cellulose diacetate in 87.6g 1,4-dioxane solvent, stir and dissolve to form a casting solution, gel in a gel bath to form a film, the prepared The membrane was washed with deionized water to remove residual organic solvents to prepare a degradable forward osmosis membrane, which was stored in deionized water for later use.

[0043] After testing, the mechanical strength...

Embodiment 2

[0045] The PHA homopolymer with a volume crystallinity of 5% and the PLA copolymer with a volume crystallinity of 30% after vacuum drying are physically mixed in a ratio of 1:7 to form a mixture; the mixture is injected into an extruder with a heating device Melt in the equipment, and then use the melt-blown method to collect the melt-blown non-woven fabric at a spinning temperature of 176 ° C;

[0046] Then use cellulose acetate as the polymer, add 15g cellulose acetate to a mixed solvent of 80g N-methylpyrrolidone and 70g N,N-dimethylacetamide, stir and dissolve to form a casting solution, and coagulate in the gel bath glue to form a membrane, and the prepared membrane is washed with deionized water to remove residual organic solvents to obtain a degradable forward osmosis membrane, which is stored in deionized water for later use.

[0047] After testing, the mechanical strength of the degradable forward osmosis membrane prepared in this example is 3.3cN / dtex, the flux of th...

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Abstract

The invention discloses a preparation method of a degradable forward osmosis membrane. The method comprises the steps that 1, vacuum-dried PHA homopolaymer or copolymer which has the volume crystallinity being 5-70% and PLA homopolaymer or copolymer which has the volume crystallinity being 5-60% at the ratio being 1:9-1:1 are physically mixed to form a mixture; 2, the mixture is injected into extrusion equipment with a heating device for fusion, then a melt blowing method is adopted for collecting melt-blowing non-woven fabric at the spinning temperature being 176-225 DEG C; 3, a casting solution is prepared; 4, the casting solution is applied to a PLA base material, and a bottom film layer is formed; 5, the bottom film layer is taken down from the PLA base material, and the degradable forward osmosis membrane is obtained. The formed forward osmosis membrane is a fully-degradable, healthy and environmentally-friendly ecological membrane; compatibility of the membrane and a supporting layer is significantly improved, internal concentration polarization is reduced, permeation flux is increased, the high rejection rate is reserved, the strength of the membrane is enhanced, and the membrane is more practical.

Description

technical field [0001] The invention belongs to the technical field of permeable membranes, and in particular relates to a preparation method of a degradable forward osmosis membrane. Background technique [0002] FO (Forward Osmosis) technology is an osmosis-driven membrane process, featuring low pollution, low energy consumption, and high recovery. It has realistic or potential application prospects in seawater desalination, energy generation, wastewater treatment, food processing, and drug concentration. However, due to the lack of efficient FO membrane materials, the traditional FO support layer material polyester (PET) mesh or non-woven fabric is one of the mainstream materials for the current commercial FO support layer, which has high strength, large porosity, and good durability. advantage. However, PET is a petroleum-based non-degradable material, and its waste causes a burden and damage to the natural environment. In recent years, the frequent occurrence of marine...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/00B01D7/00B01D69/08B01D69/12
CPCB01D61/002B01D67/0011B01D67/0013B01D67/0088B01D69/08B01D69/12
Inventor 郭凤娇
Owner 威海惠高生物科技有限公司
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