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Preparation method of salt resistant composite water retention material

A technology of water-retaining materials and salt resistance, which is applied in the preparation of salt-resistant composite water-retaining materials, and in the field of salt-resistant composite water-retaining materials prepared by acrylic acid crosslinking, which can solve the problems of few reports and achieve low cost, excellent performance, and expanded application range effect

Active Publication Date: 2012-08-01
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since G.F.Fanta et al. reported starch derivative superabsorbent resins, the research work on salt-tolerant superabsorbent resins did not appear until the mid-1970s, but there were few related reports, and the prepared salt-tolerant superabsorbent resins were mainly used. in hygiene products

Method used

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  • Preparation method of salt resistant composite water retention material
  • Preparation method of salt resistant composite water retention material
  • Preparation method of salt resistant composite water retention material

Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention discloses a preparation method of a salt resistant composite water retention material, which is obtained by triggering cross-linking polymerization of cob core powder, acrylic acid and palygorskite clay in a water phase, and belongs to the technical field of composite materials. The test shows that the composite material, prepared by the invention, has good water absorption propertyand water retention property; owing to addition of the palygorskite clay, the gel intensity, the heat resistance and the salt resistance of the composite material are effectively improved, so that the material is a drought resistant water retention composite material with excellent properties. In addition, by taking the natural cob core as the raw material, the invention has low cost, so that thewaste of resources is avoided, and the preparation method has important significance for expanding application range of the water retention composite material.

Description

technical field [0001] The invention belongs to the field of composite materials, and relates to the preparation of a salt-resistant composite water-retaining material, in particular to a method for preparing a salt-resistant composite water-retaining material by cross-linking with acrylic acid by using corn cob cores and palygorskite as raw materials. Background technique [0002] Superabsorbent Composite (Superabsorbent Composite) is a polymer material with special properties, mainly used in agriculture and horticulture and other fields. Superabsorbent composite materials are also called "superabsorbent polymers", "water-absorbent polymer resins" or "superabsorbents". Since G.F.Fanta et al. reported starch derivative superabsorbent resins, the research work on salt-tolerant superabsorbent resins did not appear until the mid-1970s, but there were few related reports, and the prepared salt-tolerant superabsorbent resins were mainly used. in sanitary products. In the 1980s,...

Claims

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Application Information

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IPC IPC(8): C08F289/00C08F220/06C08F2/44C08K3/34C09K17/40C09K101/00
Inventor 张哲沈智张惠怡李芳红高淑玲杨翠玲杨志旺雷自强
Owner NORTHWEST NORMAL UNIVERSITY
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