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Modified phosphorus rock powder superabsorbent composite and preparation method thereof

A technology of phosphate rock powder and water-retaining agent, which is applied in chemical instruments and methods, fertilizer mixtures, fibrous fillers, etc., can solve the problems of uneven dispersion of phosphate rock powder, adverse effects on water-retention performance of composite water-retaining agent, and large specific gravity. The effect of enhancing gel strength and salt resistance and water retention

Active Publication Date: 2014-05-28
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because phosphate rock powder is decomposed by strong acid to dissociate cations such as calcium, magnesium, iron, aluminum, etc., it has a great adverse effect on the water retention performance of the composite water retaining agent.
[0009] Phosphate rock powder is a solid particle with a large specific gravity. It is easy to precipitate and stratify in organic solvents such as water-soluble polymerizable monomers (such as acrylic acid and acrylamide). Uneven dispersion seriously affects product quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1 Preparation of composite water-retaining agent in which modified phosphate rock powder accounts for 10% of the mass of water-soluble polymerizable monomer

[0040] Take 20g of phosphate rock powder with a phosphorus pentoxide content of 25% and crush it to 200 mesh (particle size 0.075mm), add 1g of alkali lignin, mix well, then add 3ml of water, grind for 5 minutes, and place it at room temperature for 1h; Add the above-mentioned activated phosphate rock powder into 100ml of 0.2% solution containing sodium alginate, and stir evenly to obtain an activated-suspension-assisted phosphate rock powder mixed system; add 800ml of water to the above-mentioned activated-suspended phosphate rock powder mixed system, and stir well Add 200g of acrylic acid neutralized with potassium hydroxide (the degree of neutralization is 75%), and stir well; add 0.6g of N,N-methylenebisacrylamide and 1.6g of potassium persulfate under stirring, dissolve and stir well; The mixed...

Embodiment 2

[0041] Example 2 Preparation of composite water-retaining agent in which modified phosphate rock powder accounts for 10% of the mass of water-soluble polymerizable monomer

[0042] Take 20g of phosphate rock powder with a phosphorus pentoxide content of 35% and crush it to 100 mesh (particle size 0.15mm), add 1.5g of sodium lignosulfonate, mix well, then add 3ml of water, grind for 5 minutes, and place at room temperature Activation for 1 hour; Add the above-mentioned activated phosphate rock powder into 100ml of carboxymethyl cellulose-containing 0.5% solution, and stir evenly to obtain an activated-suspension-assisted phosphate rock powder mixed system; add 800ml water, stir evenly, add 200g of acrylic acid neutralized with potassium hydroxide (neutralization degree is 75%), stir evenly; add 0.6g of N,N-methylenebisacrylamide and 1.6g of potassium persulfate under stirring, after dissolving Stir evenly; place the above mixed system at 65°C for 1 hour, then raise the ...

Embodiment 3

[0043] Example 3 Preparation of composite water-retaining agent in which modified phosphate rock powder accounts for 10% of the mass of water-soluble polymerizable monomer

[0044] Take 20g of phosphate rock powder with a content of 10% phosphorus pentoxide that has been crushed to 250 mesh (particle size 0.063mm), add 1g of lignite containing 45% humic acid, mix well, then add 3ml of water, grind for 5 minutes, room temperature Place for activation for 1 hour; Add the above-mentioned activated phosphate rock powder into 100ml of a solution containing 0.2% sodium alginate, and stir evenly to obtain an activated-suspension-assisted phosphate rock powder mixed system; add 800ml of water to the above-mentioned activated-suspension-assisted phosphate rock powder mixed system , after stirring evenly, add 200g of acrylic acid neutralized with potassium hydroxide (the degree of neutralization is 75%), and stir evenly; while stirring, add 0.6g of N,N-methylenebisacrylamide and ...

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Abstract

The invention discloses a modified phosphorus rock powder superabsorbent composite and a preparation method thereof. The modified rock phosphate superabsorbent composite disclosed by the invention comprises modified phosphorus rock powder, a water-soluble polymerizing monomer, a water-soluble free-radical polymerization inhibitor and a cross-linking agent. The modified phosphorus rock powder superabsorbent composite disclosed by the invention has stable dynamic phosphorus-releasing characteristics; phosphorus rock powder solid particles are uniformly distributed in the polymer; and the modified phosphorus rock powder superabsorbent composite has high gel strength and good salt resistance and is applicable to the fields of plant industries such as agriculture and forestry.

Description

technical field [0001] The invention relates to the field of chemical preparations, in particular to a modified phosphate rock powder composite water retaining agent and a preparation method thereof. Background technique [0002] Superabsorbent resin is a new type of functional polymer material, which can absorb and retain hundreds or even thousands of times its own mass of pure water or tens of times of normal saline, and it is usually called superabsorbent polymer Water-absorbent polymer materials or super-absorbent resins, etc., are commonly called water-retaining agents in agriculture. [0003] The development, production and application of agricultural water-retaining agents began in 1961, when C. R. Russell and others from the Northern Research Institute of the United States Department of Agriculture began to study starch-grafted acrylonitrile, and then G. F. Fanta and others continued to study, and Henkel Corporation (Henkel Corporation) The industrialization was ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/40C08F220/06C08F220/56C08F2/44C08K9/04C08K3/32C09C1/00C09C3/00C09K101/00
Inventor 毛小云蒋刚彪陈娴廖宗文陈晓蓉黄雷
Owner SOUTH CHINA AGRI UNIV