Preparation method of salt resistant composite water retention material
A water-retaining material and salt-tolerant technology, applied in soil conditioning materials, chemical instruments and methods, organic fertilizers, etc., can solve the problems of few reports, achieve low cost, expand the application range, and good salt-tolerant performance
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Embodiment 1
[0047] Crush 3g of corn cobs and disperse them in water, heat to 40°C under nitrogen protection, gelatinize for 25min, heat up to 60°C, add 9g of acrylic acid, 1.5g of palygorskite clay, 0.018g of cross-linking agent ( N,N ′-methylenebisacrylamide), stirred at high speed for 5 minutes (rotation speed: 70~90 rpm), added 0.15g initiator (potassium persulfate), and cross-linked and polymerized at 60°C for 30 minutes; the cross-linked product was used Dehydrated with anhydrous methanol, washed with anhydrous ethanol, dried and pulverized.
[0048] The performance indicators are as follows:
[0049] Water absorption performance: the absorption of pure water is about 470g / g, and the absorption of tap water is about 190 g / g; salt resistance: the absorption of water in 0.5% sodium chloride solution is 160g / g, and the absorption of 0.9 wt% sodium chloride solution is about 80 g / g, the amount of absorbing 1.5% sodium chloride solution is 65g / g; the gel strength is 15pa.
Embodiment 2
[0051] Crush 3g of corn cob cores and disperse them in water. Under the protection of nitrogen, heat to 45°C for gelatinization for 25 minutes, then raise the temperature to 60°C, add 15g of acrylic acid, 2g of palygorskite clay, and 0.02g of crosslinking agent ( N,N ′-methylenebisacrylamide), high-speed stirring for 6 minutes (rotation speed: 70~90 rpm), add 0.17g initiator (ammonium persulfate), and cross-link polymerization at 65°C for 35 minutes; Dehydrated with anhydrous methanol, washed with anhydrous ethanol, dried and pulverized.
[0052] The performance indicators are as follows:
[0053] Water absorption performance: the absorption of pure water is about 460g / g, and the absorption of tap water is about 173 g / g; salt resistance: the absorption of water in 0.5% sodium chloride solution is 152g / g, and the absorption of 0.9 wt% sodium chloride solution is about 74 g / g, the amount of absorbing 1.5% sodium chloride solution is 55g / g; gel strength: 12pa.
Embodiment 3
[0055] Crush 3g of corncobs and disperse them in water. Under the protection of nitrogen, heat to 50°C for gelatinization for 30min, then raise the temperature to 65°C, add 11g of acrylic acid, 2.5g of palygorskite clay, 0.025g of cross-linking agent (diperoxide Cumene), high-speed stirring for 7min (rotation speed: 70~90r / min), add 0.19g initiator (ammonium persulfate), and cross-link polymerization at 70°C for 40 min; the cross-linked product is dehydrated with anhydrous methanol , washed with absolute ethanol, dried, and crushed.
[0056] The performance indicators are as follows:
[0057] Water absorption performance: the absorption of pure water is about 451g / g, and the absorption of tap water is about 170 g / g; salt resistance: the absorption of water in 0.5% sodium chloride solution is 143g / g, and the absorption of 0.9 wt% sodium chloride solution is about 70 g / g, the amount of absorbing 1.5% sodium chloride solution is 45g / g; gel strength: 10pa.
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