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High water absorbing and retaining composite containing rectorite clay mineral and method for preparing the same

A clay mineral and composite material technology, which is applied in the field of high water absorption and water retention materials in agriculture and forestry and its preparation field, can solve the problems of high raw material cost, high equipment requirements, poor salt resistance, etc., and achieves simple manufacturing process, low raw material cost, high absorption The effect of high liquid magnification

Inactive Publication Date: 2004-11-03
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the above series of varieties, some raw material costs are relatively high, some have low liquid absorption ratios for aqueous solutions containing certain ion concentrations, especially calcium and magnesium ions, some have poor salt tolerance, and some have complex processes and high equipment requirements.
The water-absorbing and water-retaining materials used for agriculture and forestry purposes are limited due to the high cost of raw materials, low liquid absorption ratio for absorbing aqueous solutions containing calcium and magnesium ions, and poor salt resistance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] In 300 grams of acrylic acid solution with a concentration of 15% and a neutralization degree of 100%, add 0.0032 grams of N, N'-methylenebisacrylamide and 0.0382 grams of potassium persulfate under stirring, and dissolve the deeply processed rector 10 grams of stone clay mineral (content greater than 50%) is added therein, and ultrasonically dispersed for 15 minutes. After the mixed material was heated in the reactor at 40°C for 7 hours, the temperature was raised to 30°C for 2 hours, and the resulting gel was dried at 60°C under vacuum for 4 hours, and then crushed mechanically to obtain the final product.

Embodiment 2

[0031] In 300 grams of acrylic acid solution with a concentration of 30% and a neutralization degree of 80%, add 0.020 grams of N, N'-methylenebisacrylamide and 0.491 grams of ammonium persulfate under stirring, and dissolve the deeply processed rector 50 grams of stone clay minerals (content greater than 90%) are added therein, and ultrasonically dispersed for 20 minutes. After the mixed material was heated in the reactor at 70°C for 2 hours, the temperature was raised to 10°C for 2 hours, and the resulting gel was dried at 110°C for 5 hours, and then crushed mechanically to obtain the final product.

Embodiment 3

[0033] In 200 grams of acrylic acid solution with a concentration of 45% and a neutralization degree of 20%, add 0.005 grams of N, N'-methylene bisacrylamide and 0.050 grams of potassium persulfate under stirring, and dissolve the deeply processed rector 30 grams of stone clay mineral (content greater than 60%) is added therein, and the colloid mill is dispersed. After the mixed material was heated at 60°C for 3 hours in the reactor, the temperature was raised to 20°C for 3 hours, and the resulting gel was dried at 150°C for 1 hour, and then crushed mechanically to obtain the final product.

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PUM

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Abstract

The water absorbing and maintaining composite material consists of water soluble unsaturated ethylene monomer, rectorite-clay mineral in the amount of 2-300 wt% of the ethylene monomer, and water soluble free radical polymerization initiator in the amount of 0.001-1 wt% of the ethylene monomer. The preparation process includes adding rectorite-clay mineral into 5-50 % concentration water soluble unsaturated ethylene monomer solution with water soluble free radical polymerization initiator or water soluble free radical polymerization initiator and crosslinking agent, dispersing, heating to 20-90 deg,c for polymerization of 1-10 hr, drying of the polymerized product at 40-150 deg.c and crushing mechanically to obtain grain product. The water absorbing and maintaining composite material has low cost, high absorption to calcium and magnesium ion aqua and high salt tolerance, and is suitable for use in agriculture and forestry.

Description

technical field [0001] The invention relates to a superabsorbent and water-retaining agent and a preparation method thereof, in particular to a superabsorbent and water-retaining material used in agriculture and forestry and a preparation method thereof. Background technique [0002] In recent years, superabsorbent and water-retaining agents have been widely used as sanitary products and industrial materials. Among the known superabsorbent and water-retaining agents, there are the following series of varieties: water-soluble vinyl monomer homopolymers, copolymers, starch-grafted vinyl water-soluble monomer series, cellulose-grafted vinyl water-soluble Sexual monomer series, cross-linked carboxymethyl cellulose, etc. In the composite series, there are composites of superabsorbent resins and inorganic gels, and composites of superabsorbent resins and organic substances. Among the above series of varieties, some have high cost of raw materials, some have low absorption rate f...

Claims

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Application Information

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IPC IPC(8): C08F2/44C08K3/34C08L33/00
Inventor 范力仁沈上越王春龙
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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