Reverse osmosis membrane non-woven support material coated with modified polyester powder and preparation method thereof
A technology for modifying polyester and reverse osmosis membranes, used in reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc. It can solve problems such as poor pore size distribution concentration, difficulty in meeting actual production, and affecting the consistency of coating films. , to achieve the effect of high practical application value, saving coating cost and improving production efficiency
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[0029] The invention provides a preparation method of a reverse osmosis membrane non-woven support material coated with modified polyester powder. The schematic flow chart is as follows: figure 1 shown, including the following steps:
[0030] S1, take terephthalic acid, ethylene glycol, sodium dihexyl sulfosuccinate, polyethylene glycol and neopentyl glycol as raw materials, prepare modified polyester through esterification and polycondensation; Polyester and epoxy resin are melted and blended according to a preset mass ratio, and are extruded and granulated and then ground to obtain modified polyester powder;
[0031] S2, adopting the papermaking method to prepare polyester non-woven fabric, then immersing the polyester non-woven fabric in a treatment solution containing diethylenetriamine for post-treatment, and drying to obtain a non-woven fabric base material;
[0032] S3, uniformly dispersing the modified polyester powder obtained in step S1 in water to prepare a coating l...
Embodiment 1
[0042] This embodiment provides a preparation method of a reverse osmosis membrane non-woven support material coated with modified polyester powder, comprising the following steps:
[0043] S1. Preparation of modified polyester powder
[0044] The terephthalic acid and ethylene glycol are mixed according to the molar ratio of 1:1.2 and added to the reaction kettle, and then the catalyst antimony trioxide and the stabilizer trimethyl phosphate are added to the reaction kettle in turn to control the antimony trioxide and the trimethyl phosphate. Methyl ester accounts for 0.05% and 0.08% of the total mass of terephthalic acid and ethylene glycol, respectively, and react at 240 ° C for 3 hours under nitrogen atmosphere to carry out esterification reaction; after the esterification reaction is completed, add to the reaction kettle. Sodium dihexyl sulfosuccinate, after stirring at 200 ℃ for 25min, then add polyethylene glycol and neopentyl glycol to control sodium dihexyl sulfosucci...
Embodiment 2
[0056] Examples 2 to 3 and Comparative Examples 1 to 3 respectively provide a method for preparing a reverse osmosis membrane non-woven support material coated with modified polyester powder. Compared with Example 1, the difference between Example 2 and Example 3 is to adjust the molar ratio of sodium dihexyl sulfosuccinate, polyethylene glycol, neopentyl glycol and terephthalic acid in step S1. are 0.015:0.08:0.03:1 and 0.025:0.12:0.04:1; the difference between Comparative Examples 1 to 3 is that the types of raw materials added are reduced, and in Comparative Example 1, no dihexyl sulfosuccinate was added. Sodium, polyethylene glycol was not added in Comparative Example 2, and neopentyl glycol was not added in Comparative Example 3, and the remaining steps were the same as those in Example 1, and will not be repeated here.
[0057] The average pore size and pore size variance of the reverse osmosis membrane nonwoven support materials coated with modified polyester powder pre...
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Abstract
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