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Preparation method of enhanced chlorinated polyvinyl chloride hollow fiber membrane

A technology of chlorinated polyvinyl chloride and fiber membrane, which is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as broken wires and degraded effluent water quality, and achieve reduced process costs, low prices, and solutions The effect of easy wire breakage

Inactive Publication Date: 2017-05-24
康泽源(天津)科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In wastewater treatment, due to the disturbance of aeration, broken wires often occur, resulting in a decline in effluent quality

Method used

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  • Preparation method of enhanced chlorinated polyvinyl chloride hollow fiber membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) A two-dimensional braiding machine is used to weave CPVC filaments into a CPVC hollow braided tube with a diameter of 1.4 mm.

[0024] (2) 20wt% CPVC (weight average molecular weight is 160000 Daltons, chlorine content is 64.5%), 17wt% polyethylene glycol and 2wt% methyltin maleic anhydride are dissolved in 61wt% at 65°C In the N,N-dimethylformamide, after stirring and vacuum defoaming for 24 hours, the CPVC casting solution was obtained.

[0025] (3) Adopt co-extrusion composite spinning process, the hollow braided pipe that step (1) obtains and the CPVC cast film solution that step (2) obtains are co-extruded through annular spinneret, and make described cast film solution uniform coated on the surface of the hollow braided tube, after a 10 cm dry spinning process, immersed in water at 50° C., and fully cured, the reinforced CPVC hollow fiber membrane was obtained.

[0026] After testing, the obtained reinforced CPVC hollow fiber membrane has a diameter of 2.0mm ...

Embodiment 2

[0028] (1) A two-dimensional braiding machine is used to weave CPVC filaments into a CPVC hollow braided tube with a diameter of 1.4 mm.

[0029] (2) 20wt% CPVC (weight average molecular weight is 160000 Daltons, chlorine content is 64.5%), 17wt% polyethylene glycol and 2wt% methyltin maleic anhydride are dissolved in 61wt% at 65°C In the N,N-dimethylformamide, after stirring and vacuum defoaming for 24 hours, the CPVC casting solution was obtained.

[0030] (3) Use γ-methacryloxypropyltrimethoxysilane (KH570) to infiltrate the hollow fiber tube prepared in step (1), so that the outer surface of the hollow braided tube is fully infiltrated, and the infiltration time is 0.5h*

[0031] (4) Adopt co-extrusion composite spinning process, the hollow braided pipe that step (3) obtains and the CPVC cast film liquid that step (2) obtains are co-extruded through annular spinneret, and make described cast film liquid evenly coated on the surface of the hollow braided tube, after a 10 c...

Embodiment 3

[0034] (1) A two-dimensional braiding machine is used to weave CPVC filaments into a CPVC hollow braided tube with a diameter of 1.6 mm.

[0035](2) 20wt% CPVC (weight average molecular weight is 160000 Daltons, chlorine content is 64.5%), 17wt% polyethylene glycol and 2wt% methyltin maleic anhydride are dissolved in 61wt% at 65°C In the N,N-dimethylformamide, after stirring and vacuum defoaming for 24 hours, the CPVC casting solution was obtained.

[0036] (3) Adopt co-extrusion composite spinning process, the hollow braided pipe that step (1) obtains and the CPVC cast film solution that step (2) obtains are co-extruded through annular spinneret, and make described cast film solution uniform coated on the surface of the hollow braided tube, after a 10 cm dry spinning process, immersed in water at 50° C., and fully cured, the reinforced CPVC hollow fiber membrane was obtained.

[0037] After testing, the obtained reinforced CPVC hollow fiber membrane has a diameter of 2.2mm a...

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Abstract

The invention discloses a preparation method of a chlorinated polyvinyl chloride (CPVC) hollow fiber membrane. The preparation method comprises the following process steps: (1) preparing fibers into a hollow braided tube by adopting a two-dimensional braiding technology, and taking the hollow braided tube as a hollow fiber membrane enhancement body; (2) preparing a CPVC casting solution from the following components in percentage by weight: 15 to 35 percent of CPVC, 5 to 20 percent of pore-foaming agent, 2 to 10 percent of processing aid and 40 to 70 percent of organic solvent, totaling 100 percent; (3) coextruding the hollow braided tube obtained in the step (1) and the CPVC casting solution obtained in the step (2) through an annular spinning nozzle by adopting a co-extrusion compound spinning process, uniformly coating the surface of the hollow braided tube with the casting solution, and fully curing to obtain the enhanced CPVC hollow fiber membrane. The enhanced CPVC hollow fiber membrane prepared by the method has high toughness, is low in production cost, and has a wide practical application prospect; the problem of insufficient mechanical strength of an elemental CPVC hollow fiber membrane can be solved effectively.

Description

technical field [0001] The invention belongs to the technical field of membrane preparation, and in particular relates to a preparation method of a reinforced chlorinated polyvinyl chloride hollow fiber membrane. Background technique [0002] Chlorinated polyvinyl chloride (CPVC) is the product of further chlorination of polyvinyl chloride (PVC), and the mass fraction of chlorine is generally 63%-68%. It is an important heat-resistant PVC modified variety. As the mass fraction of chlorine increases, the polarity of the molecular bond increases and the intermolecular force strengthens, so that CPVC has many excellent properties: (1) Good heat resistance, its Vicat softening point is about 40 ° C higher than that of PVC resin, and the products It can be used for a long time in the temperature range of -40-98 ℃, and it is one of the few polymers that can be used for a long time under higher temperature and higher pressure; (2) It can withstand most acids, alkalis and salts, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/30B01D69/08B01D69/10B01D69/02B01D67/00
Inventor 娄鹏
Owner 康泽源(天津)科技发展有限公司
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