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A kind of high-strength polyethylene composite film for water treatment and preparation method thereof

A high-strength polyethylene and composite membrane technology, which is applied in the direction of osmosis/dialysis water/sewage treatment, chemical instruments and methods, membranes, etc., can solve the problems of decreased mechanical capacity, easy to block pores, short service life, etc. Short, suppresses clogging problems, evenly distributed effect

Active Publication Date: 2022-04-22
JIANGSU HORIZON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The microporous polyethylene membrane is widely used in battery separators because of its adjustable pores, excellent mechanical properties, and chemical stability. It is a potential main body of water treatment membranes, but it is rarely used in water treatment because It is hydrophobic, long-term operation in the water environment, it is easy to cause a decrease in mechanical capacity, resulting in low durability and short service life; and the residue of pollutants can easily block the pores during long-term use; therefore, a series of treatment methods are required to improve , increase hydrophilicity, water resistance, anti-fouling properties, so that it can be used in water treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Step 1: Preparation of solvent: Mix the PVA solution with a concentration of 0.8wt% and the bacterial cellulose solution with a concentration of 0.5wt% in a volume ratio of 2:1, set it at 92°C and stir for 1.25 hours to obtain solution A, which is set aside; Concentration is that the sulfuric acid solution of 6wt% and the tartaric acid solution of 0.28wt% are equal-volume mixed, and setting temperature is 28 ℃ and stirs for 42 minutes, obtains solution B, for subsequent use; Hydroquinone solution and sodium lauryl sulfate solution with a concentration of 0.15wt% were mixed in equal volumes to obtain solution C for subsequent use; acryloyl chloride was dissolved in toluene to obtain solution D with a concentration of 1.5wt% for subsequent use; the mass ratio 12.5:1 L-cysteine ​​and potassium persulfate are dissolved in a buffer solution to obtain a solution E with a concentration of 22wt%, which is set aside;

[0024]Step 2: Preparation of polyethylene composite membrane...

Embodiment 2

[0026] Step 1: Preparation of solvent: mix the PVA solution with a concentration of 0.5wt% and the bacterial cellulose solution with a concentration of 0.4wt% at a volume ratio of 2:1, set it at 90°C and stir for 1 hour to obtain solution A, which is set aside; Concentration is that the sulfuric acid solution of 5wt% and the tartaric acid solution of 0.25wt% are equal-volume mixed, and setting temperature is 25 ℃ and stirs for 40 minutes, obtains solution B, for subsequent use; Hydroquinone solution and sodium lauryl sulfate solution with a concentration of 0.1wt% were mixed in equal volumes to obtain solution C for subsequent use; acryloyl chloride was dissolved in toluene to obtain solution D with a concentration of 1 wt% for subsequent use; the mass ratio was 12:1 L-cysteine ​​and potassium persulfate are dissolved in a buffer solution to obtain a solution E with a concentration of 20 wt%, which is set aside;

[0027] Step 2: Preparation of polyethylene composite membrane: ...

Embodiment 3

[0029] Step 1: Preparation of solvent: Mix the PVA solution with a concentration of 1wt% and the bacterial cellulose solution with a concentration of 0.6wt% in a volume ratio of 2:1, set it at 95°C and stir for 1.5 hours to obtain solution A, which is set aside; Mix equal volumes of 8wt% sulfuric acid solution and 0.3wt% tartaric acid solution, set the temperature at 30°C and stir for 45 minutes to obtain solution B for subsequent use; The diphenol solution and the sodium lauryl sulfate solution with a concentration of 0.2wt% are mixed in equal volumes to obtain solution C, which is for subsequent use; acryloyl chloride is dissolved in toluene to obtain a solution D with a concentration of 2wt%, which is for subsequent use; the mass ratio is 13 : 1 L-cysteine ​​and potassium persulfate are dissolved in a buffer solution to obtain a solution E with a concentration of 25wt%, for subsequent use;

[0030] Step 2: Preparation of polyethylene composite membrane: soak the microporous...

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Abstract

The invention discloses a high-strength polyethylene composite film for water treatment and a preparation method thereof. The polyethylene composite membrane includes microporous polyethylene membrane, polyvinyl alcohol / bacterial cellulose and L-cysteine. Beneficial effects: (1) Use polyvinyl alcohol / bacterial cellulose to modify the microporous polyethylene film to improve the heat resistance, water resistance and mechanical strength of the polyethylene composite film; (2) Prepare polyvinyl alcohol / bacteria by microwave reaction method Cellulose, reduce the reaction time, and make it have a more uniform and finer cross-linked structure; (3) use small molecule acryloyl chloride to modify polyvinyl alcohol / bacterial cellulose, reduce the surface roughness of polyethylene composite film, increase the film (4) Using thiol reaction to graft L-cysteine ​​on the polyethylene composite film, effectively inhibiting the reaction of active amino and carboxyl groups, thereby increasing the antifouling property of the film .

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a high-strength polyethylene composite film for water treatment and a preparation method thereof. Background technique [0002] Since the beginning of the new century, the process of social urbanization has intensified, making the problem of water pollution caused by human activities more and more serious. The discharge of untreated wastewater from industry, agriculture and households pollutes surface water and groundwater, restricting human's direct access to fresh water resources, and membrane separation technology is considered to be one of the most effective technologies to solve this problem. Among them, the ultrafiltration membrane is a membrane with high mechanical strength and good chemical stability, which is used for water treatment. However, the generally treated water contains protein pollution, which can easily cause the adhesion of pollutants, resulting in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/12B01D69/02B01D71/26B01D67/00C02F1/44
CPCB01D69/125B01D69/02B01D71/26B01D67/0093C02F1/44B01D2323/34B01D2325/22B01D2325/24B01D2325/36
Inventor 翁星星刘涛涛沈亚定盛夏
Owner JIANGSU HORIZON NEW ENERGY TECH CO LTD
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