Composite support material for reverse osmosis membrane and preparation method thereof
A composite support, reverse osmosis membrane technology, used in semi-permeable membrane separation, chemical instruments and methods, osmosis/dialysis water/sewage treatment, etc. The problem of restricting the reverse osmosis membrane of the supporting material, etc., achieves the effect of large flux, long service life, and reducing the average pore size
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[0032] The invention provides a preparation method of a composite support material for reverse osmosis membrane, comprising the following steps:
[0033] S1. The polyester non-woven fabric is prepared by the papermaking method;
[0034] S2, melt-blown spinning is carried out to ethylene-methyl acrylate copolymer or modified ethylene-methyl acrylate copolymer to obtain melt-blown non-woven fabric;
[0035] S3. The melt-blown non-woven fabric obtained in step S2 is superimposed on the upper surface of the polyester non-woven fabric obtained in step S1, and after hot pressing treatment, a composite support material for reverse osmosis membrane is obtained.
[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 fibers and binding fibers with water, and then perform beating treatment to obtain a fiber slurry; fully dilute the fiber slurry into a fiber su...
Embodiment 1
[0053] The present 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 paper making method
[0055] The polyester fiber and the binding fiber are mixed according to a mass ratio of 65:35 and placed in a beating machine, and then water is added for beating treatment to obtain a fiber slurry; then water is added to the fiber slurry and stirred evenly to fully dilute it. After the fiber suspension is formed, it is made into a web, and then dried at 80° C. to obtain a polyester non-woven fabric. Wherein, the technological bonding temperature of the binding fibers is 180-200°C.
[0056] S2. Preparation of melt-blown non-woven fabric
[0057] Select the ethylene-methyl acrylate copolymer with a melting point of 220 °C, add it into the screw extruder, heat and melt it at 270 °C, and spray it out from the spinneret on the melt-blown die head. ...
Embodiment 2
[0062] This example provides a preparation method for a composite support material for reverse osmosis membranes. Compared with Example 1, the difference is that the ethylene-methyl acrylate copolymer is modified, and the modified ethylene-methyl acrylate copolymer is used. The methyl acrylate copolymer is used as a raw material for melt-blown spinning, and the remaining steps are the same as those in 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 be 5:2:1, and add hydrochloric acid (12 mol / mol / kg) after fully stirring the reaction for 10 h. L), and then sequentially added sodium bicarbonate solution and sodium chloride solution for extraction to obtain the extract...
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Abstract
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