Preparing method of internally-supported reinforced type polyvinylidene fluoride hollow fiber film

A polyvinylidene fluoride and fiber membrane technology, which is applied in chemical instruments and methods, membranes, membrane technology, etc., can solve the problems of poor bonding performance of internal support reinforced hollow fiber membranes, and achieve the goal of reducing broken wires and fouling Possibilities, extended service life, effect of good bonding properties

Active Publication Date: 2016-11-23
盐城海普润科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the defect of poor bonding performance of the existing internal support reinforced hollow fiber membrane, the purpose of the present invention is to provide a simple and feasible internal support that can improve the bonding performance between the cortical membrane material and the hollow braided rope Preparation method of reinforced hollow fiber membrane

Method used

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  • Preparing method of internally-supported reinforced type polyvinylidene fluoride hollow fiber film
  • Preparing method of internally-supported reinforced type polyvinylidene fluoride hollow fiber film

Examples

Experimental program
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Effect test

Embodiment 1

[0031] 40g of polyvinylidene fluoride resin with a weight average molecular weight of 400,000, 10g of polyethylene glycol (molecular weight 600), 0.5g of anhydrous lithium chloride, and 49.5g of dimethylformamide were uniformly mixed and stirred at 90°C , dissolved, filtered and defoamed to obtain a polyvinylidene fluoride casting solution with a mass concentration of 40%. The polyester hollow braided rope with a length of 50 cm, an inner diameter of 0.5 mm, and an outer diameter of 1.2 mm was soaked in a 10% sodium hydroxide aqueous solution for 0.5 h at 80° C., and then washed and dried in water. The braided rope was treated with an aqueous solution of polyester polyether block copolymerization type hydrophilic finishing agent with a mass concentration of 10% at room temperature for 30 minutes, and then the braided rope was baked at 120° C. for 20 minutes. Then, under the condition of 60°C, the outer surface of the hollow braided rope is coated with a layer of polyvinylidene...

Embodiment 2

[0033] Mix 6g of polyvinylidene fluoride resin with a weight average molecular weight of 700,000, 0.75g of polyethylene glycol (molecular weight of 2000), 1.5g of alumina, and 41.75g ​​of dimethylacetamide at 30°C, stir and dissolve , after filtering and defoaming, a polyvinylidene fluoride casting solution with a mass concentration of 12% was obtained. The polyester hollow braided rope with a length of 50 cm, an inner diameter of 2.2 mm and an outer diameter of 3.2 mm was soaked in a 20% sodium hydroxide aqueous solution for 1 hour at 40°C, and then washed and dried in water. The braided rope was treated with an aqueous solution of polyester polyether block copolymerization type hydrophilic finishing agent with a mass concentration of 8% at room temperature for 20 minutes, and then the braided rope was baked at 110° C. for 30 minutes. Then, under the condition of 50°C, a layer of polyvinylidene fluoride casting solution with a mass concentration of 12% was coated on the outer...

Embodiment 3

[0035] 9g of polyvinylidene fluoride resin with a weight average molecular weight of 700,000, 1.5g of polyethylene glycol (molecular weight 200), 1g of calcium chloride, and 38.5g of N-methylpyrrolidone were uniformly mixed, stirred, and dissolved at 50°C. After filtering and defoaming, a polyvinylidene fluoride casting solution with a mass concentration of 18% was obtained. The polyester hollow braided rope with a length of 50cm, an inner diameter of 1.8mm and an outer diameter of 3.0mm was soaked in 30% sodium hydroxide aqueous solution for 0.5h at 60°C, and then washed and dried in water. The braided rope was treated with an aqueous solution of polyester polyether block copolymerization type hydrophilic finishing agent with a mass concentration of 5% at room temperature for 20 minutes, and then the braided rope was baked at 110° C. for 30 minutes. Then, under the condition of 40°C, the outer surface of the hollow braided rope is coated with a layer of polyvinylidene fluorid...

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Abstract

The invention relates to a preparing method of an internally-supported reinforced type polyvinylidene fluoride hollow fiber film. The preparing method comprises the steps that a sodium hydroxide aqueous solution is used for removing grease dirt on the surfaces of braided ropes, and then the hollow braided ropes are treated with a polyester-polyether block copolymerization type hydrophilic finishing agent; then, the outer surfaces of the treated braided ropes are coated with a thin layer of a polyvinylidene fluoride film casting solution, solidifying and forming are carried out, and the internally-supported reinforced type polyvinylidene fluoride hollow fiber film is obtained. Polyether soft segments and polyester hard segments exist in molecules of the adopted polyester-polyether block copolymerization type hydrophilic finishing agent, and according to the similarity and mutual attraction principle, the polyester hard segments can generate co-solubility and co-crystallization effects with polyester in the heated process to enable the hydrophilic finishing agent to be preserved on the braided ropes for long; meanwhile, the polyether soft segments can generate a co-solubility effect with the film casting solution to enable the polyester braided ropes and the polyvinylidene fluoride film layer to have good binding performance; the prepared internally-supported reinforced type polyvinylidene fluoride hollow fiber film can be used in MBR and immersion type ultrafiltration assemblies.

Description

field of invention [0001] The invention relates to a preparation method of an inner support reinforced polyvinylidene fluoride hollow fiber membrane. Background technique [0002] Due to the incomparable advantages of the traditional process, such as high processing speed and high processing precision, the membrane method has been widely used in China. The membranes used in sewage treatment are also various. The membranes that have been widely used in sewage treatment are divided into flat membranes, roll membranes, and hollow fiber membranes according to their shapes. With the large-scale application of membrane separation technology in water treatment, the requirements for membrane strength are getting higher and higher. Flat membranes are usually a combination of membranes and substrate materials, and hollow fiber membranes are self-supporting membranes. In order to improve the strength of the hollow fiber membrane, the method of combining the braided tube and the membr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D71/34B01D69/10C02F1/44C02F3/00B01D69/08B01D69/02
CPCB01D67/0016B01D69/02B01D69/08B01D69/105B01D71/34B01D2325/36C02F1/44C02F3/00
Inventor 刘必前
Owner 盐城海普润科技股份有限公司
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