Water-retaining and sand-fixing liquid mulch film and preparation method thereof
A technology of liquid mulching film and water glass solution, applied in the direction of plant protection cover, etc., can solve the problems of lack of comprehensive performance of sand fixation and water retention, limitation of raw material sources, and high cost of mulching film, so as to improve the repeated water absorption performance, improve the water absorption and water retention performance, Improved effect of poor salt tolerance
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Embodiment 1
[0044] Preparation of ultrafine silica sol: After diluting and dissolving sodium silicate in water, ultrasonically oscillate for 20 minutes and mix evenly to form a water glass solution with a concentration of 30wt%. 2 Mix to obtain composite resin; fully stir and mix the water glass solution and the composite exchange resin according to the weight ratio of 20:1, remove impurities, and obtain a pretreated silicic acid solution; add alkali solution to the silicic acid solution, and adjust the pH value to 9.5, The silica sol mother liquor was obtained after heating and reacting at 70°C under normal pressure for 2 hours; the silica sol mother liquor was dehydrated, concentrated and purified to prepare a silica sol with a concentration of 20 wt%, wherein the silica particle size was between 1-100nm.
[0045] At room temperature, add 4 g of carboxymethyl cellulose to deionized water, stir until completely dissolved under nitrogen protection, then add 2 g of ultrafine silica sol solu...
Embodiment 2
[0047] At room temperature, add 3 g of carboxymethyl cellulose to deionized water, stir until completely dissolved under nitrogen protection, then add 1.5 g of 20 wt% superfine silica sol solution and 0.05 g of ferrocene to form a sol liquid; then add 2g of N-isopropylacrylamide monomer, heated to 40°C under nitrogen atmosphere, stirred and dissolved for about 25min; adjusted the pH value to 8.5 with NaOH solution, added 0.05g of potassium persulfate and 0.05g of anhydrous sodium sulfite in sequence Aqueous solution, containing 0.02g cross-linking agent N,N-methylenebisacrylamide aqueous solution, accelerated stirring, after 3.5h heat preservation reaction, cooled to room temperature to obtain a gel; the gel was prepared into an aqueous solution with a concentration of 5wt%, and used After acetone precipitates and separates the polymer, it is dried in a vacuum oven at a drying temperature of 60° C. to obtain the super absorbent of the present invention.
Embodiment 3
[0049] At room temperature, add 10 g of carboxymethyl cellulose to deionized water, stir until completely dissolved under the protection of nitrogen, then add 4 g of 20 wt % superfine silica sol solution and 0.1 g of ferrocene to form a sol liquid; then add 6 g of N -Isopropylacrylamide monomer, under nitrogen atmosphere, heat to 30°C, stir and dissolve for about 30min; adjust the pH value to 9.5 with NaOH solution, add 0.05g potassium persulfate and 0.05g anhydrous sodium sulfite aqueous solution in sequence , containing 0.06g of cross-linking agent N, N-methylenebisacrylamide aqueous solution, accelerated stirring, after 3 hours of heat preservation reaction, cooled to room temperature to obtain a gel; the gel was formulated into an aqueous solution with a concentration of 5wt%, and acetone was added to After the polymer is precipitated and separated, it is dried in a vacuum drying oven at a drying temperature of 60° C. to obtain the superabsorbent of the present invention. ...
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