Composite support material for reverse osmosis membrane and preparation method of composite support material

A technology of composite support and reverse osmosis membrane, which is applied in the fields of semipermeable membrane separation, chemical instruments and methods, osmosis/dialysis water/sewage treatment, etc. It can solve the problem of reverse osmosis that affects the mechanical strength of the support material, the pore structure distribution, and the restriction of the support material. Membrane, poor bonding effect and other problems, to achieve the effect of large flux, long service life, and reduce the average pore size

Active Publication Date: 2021-09-03
安徽清澜新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this patent, the eutectic point of the polymer used in the middle layer of the reverse osmosis membrane support material is slightly lower than that of the thermoplastic polymer used in the surface layer and the bottom layer. During the hot pressing process,...

Method used

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  • Composite support material for reverse osmosis membrane and preparation method of composite support material
  • Composite support material for reverse osmosis membrane and preparation method of composite support material

Examples

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preparation example Construction

[0032] The invention provides a method for preparing a composite support material for a reverse osmosis membrane, comprising the steps of:

[0033] S1, adopt papermaking method to prepare polyester non-woven fabric;

[0034] S2, performing melt-blown spinning on the ethylene-methyl acrylate copolymer or the modified ethylene-methyl acrylate copolymer to obtain a melt-blown non-woven fabric;

[0035] S3. Superimpose the melt-blown nonwoven fabric obtained in step S2 on the upper surface of the polyester nonwoven fabric obtained in step S1, and heat and press to obtain a composite support material for a reverse osmosis membrane.

[0036] In step S1, the preparation of polyester non-woven fabric by the papermaking method specifically includes the following steps:

[0037]Mix a predetermined amount of polyester fiber and binder fiber with water and perform beating treatment to obtain a fiber slurry; fully dilute the fiber slurry into a fiber suspension and then sheet it into a ne...

Embodiment 1

[0053] This embodiment provides a method for preparing a composite support material for a reverse osmosis membrane, comprising the following steps:

[0054] S1. Preparation of polyester non-woven fabric by papermaking method

[0055] Mix the polyester fiber and the binder fiber according to the mass ratio of 65:35 and place them in a beater, then add water for beating treatment to obtain a fiber slurry; then add water to the fiber slurry and stir evenly to make it fully diluted After the fiber suspension is formed, it is sheeted into a net, and then dried at 80°C to obtain a polyester non-woven fabric. Wherein, the process bonding temperature of the bonding fiber is 180-200°C.

[0056] S2, preparation of melt-blown non-woven fabric

[0057] Select an ethylene-methyl acrylate copolymer with a melting point of 220°C, add it to a screw extruder, heat and melt it at 270°C, and then spray it out from the spinneret hole on the melt-blown die, and pass through a hot air flow of 280...

Embodiment 2

[0062] This example provides a method for preparing a composite support material for a reverse osmosis membrane. Compared with Example 1, the difference is that the ethylene-methyl acrylate copolymer is modified, and the modified ethylene-methyl acrylate Methyl acrylate copolymer was used as a raw material for melt blown spinning, and the rest of the steps were consistent with Example 1, and will not be repeated here.

[0063] Wherein, the preparation of modified ethylene-methyl acrylate copolymer comprises the steps:

[0064] S21, preparation of nickel complex catalyst

[0065] Dissolve aniline in dichloromethane, then add trimethyl phosphite and elemental iodine, control the molar ratio of aniline, trimethyl phosphite and iodine to 5:2:1, fully stir the reaction for 10h, then add hydrochloric acid (12mol / L), adding sodium bicarbonate solution and sodium chloride solution successively for extraction to obtain an extraction product; spin-drying the extraction product and dis...

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Abstract

The invention provides a preparation method of a composite support material for a reverse osmosis membrane. According to the invention, polyester non-woven fabric is prepared by adopting a papermaking method, and melt-blown spinning is performed on an ethylene-methyl acrylate copolymer or a modified ethylene-methyl acrylate copolymer to prepare a melt-blown non-woven fabric; and superposing the melt-blown non-woven fabric on the upper surface of the polyester non-woven fabric, and carrying out hot pressing treatment to prepare the composite support material for the reverse osmosis membrane. Through the mode, the hot-pressing treatment process can be utilized to enable the adhesive fibers in the polyester non-woven fabric to permeate into the melt-blown non-woven fabric, so that the pore structure is further optimized while the bonding strength between the polyester non-woven fabric and the melt-blown non-woven fabric layer is effectively improved, so that the support material with small average pore size, high porosity, high mechanical strength and good corrosion resistance is formed, production of reverse osmosis membrane products with large flux, high desalination rate and long service life is facilitated, and the support material has high practical application value.

Description

technical field [0001] The invention relates to the technical field of support materials for reverse osmosis membranes, in particular to a composite support material for reverse osmosis membranes and a preparation method thereof. Background technique [0002] Reverse osmosis technology is a membrane separation operation that uses pressure difference as the driving force to separate the solvent from the solution. As the core component of reverse osmosis technology, reverse osmosis membrane is an artificial semipermeable membrane with certain characteristics made of simulated biological semipermeable membrane. It has the advantages of good separation performance, thin thickness and high pressure resistance. It has been widely used in seawater desalination, Desalination, wastewater treatment, concentration and separation, and other fields have been widely used in electric power, food and beverage, pharmaceutical, chemical, petroleum and other industries, creating huge social an...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D69/10B01D69/02C02F1/44D04H1/56D04H1/4282D01D5/098B32B27/36B32B27/30B32B27/02B32B27/12B32B27/18B32B7/12B32B37/06B32B37/10B32B37/12
CPCB01D69/12B01D69/10B01D69/02C02F1/441D04H1/56D04H1/4282D01D5/0985B32B5/022B32B5/26B32B37/06B32B37/10B32B37/12B01D2325/24B32B2037/1215B32B2262/0246B32B2262/0276B32B2307/714Y02A20/131
Inventor 楼钱吴立群游军
Owner 安徽清澜新材料科技有限公司
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