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Slow-release humic acid microsphere water-loss reducer and method for making same

A technology of humic acid and water-retaining agent, applied in the direction of organic fertilizer, fertilizer mixture, waste fuel, etc., can solve the problem of fast release rate and achieve good soil improvement effect

Inactive Publication Date: 2008-05-14
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in actual use, the release rate of the powdered product is faster

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Select attapulgite microspheres with a particle size of 1 mm, place them in a saturated solution of humic acid, and absorb them for 4 hours before use. Add 7.20 g of acrylic acid to the reactor, add 20 ml of distilled water to dissolve, add 5.0 g of attapulgite microspheres adsorbed with humic acid, 122.3 mg of N, N' methylenebisacrylamide and 18.4 mg of potassium persulfate, The temperature was raised to 70°C for 3h. After the reaction, the product was washed with methanol / water solution, and then dried at 70°C to constant weight. The product in the present embodiment absorbs 480 grams of distilled water per gram, and the color and luster is black.

Embodiment 2

[0018] Select attapulgite microspheres with a particle size of 2 mm, place them in a saturated solution of humic acid, and absorb them for 6 hours before use. Add 7.20 g of acrylic acid to the reactor, add 20 ml of distilled water to dissolve, add 4.2 g of attapulgite microspheres adsorbed with humic acid, 122.3 mg of N, N' methylenebisacrylamide and 18.4 mg of potassium persulfate, The temperature was raised to 70°C for 3h. After the reaction, the product was washed with methanol / water solution, and then dried at 70°C to constant weight. The product in the present embodiment absorbs 425 grams of distilled water per gram, and the color and luster is black.

Embodiment 3

[0020] Select attapulgite microspheres with a particle size of 4 mm, place them in a saturated solution of humic acid, and absorb them for 8 hours before use. Add 7.20 g of acrylic acid to the reactor, add 20 ml of distilled water to dissolve, add 5.2 g of attapulgite microspheres adsorbed with humic acid, 122.3 mg of N, N' methylenebisacrylamide and 18.4 mg of potassium persulfate, and heat up Reaction at 70°C for 3h. After the reaction, the product was washed with methanol / water solution, and then dried at 70°C to constant weight. The product in the present embodiment absorbs 328 grams of distilled water per gram, and the color and luster is black.

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Abstract

The invention relates to a microsphere water retention agent and preparation method with polyacrylic acid / attapulgite clay / humic acid, which is characterized in that acrylic acid, attapulgite clay and humic acid are used as main raw materials to produce the microsphere water retention agent with the function of slow release fertilizer through the processes of granulation, absorption, copolymerization, crosslinking, washing and drying. The multiplication factor of the water retention agent for absorbing the distilled water is 300 to 500 g / g. The invention has the advantages that the water retention agent can keep a plurality of advantages of common fertilizer in farming and can also slowly release nutrient to field crops, thus, the product has potential application prospects.

Description

technical field [0001] The invention relates to a slow-release humic acid water-retaining agent, in particular to a polyacrylic acid / attapulgite clay / humic acid microsphere water-retaining agent and a preparation method thereof. Background technique [0002] The water-retaining agent with the function of slow-release fertilizer can be prepared by simply wrapping the fertilizer in the water-retaining agent, or by making the two undergo some form of chemical reaction, so that the two can be organically combined. Guo et al. dissolved fertilizers such as ammonia water, urea, and diammonium hydrogen phosphate in water, and wrapped these components in the carboxymethyl starch-g-acrylic acid water-retaining agent network during the polymerization reaction to obtain a water-retaining agent with slow-release nitrogen fertilizer and phosphate fertilizer. Fertilizers are mainly combined on the resin network through hydrogen bonds and van der Waals forces, but there are also fertilizers...

Claims

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Application Information

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IPC IPC(8): C05F11/02C05G3/00
CPCY02E50/30Y02W30/40
Inventor 王爱勤郑易安汪琴
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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