Soil leavening agent and preparation method

A technology of soil leavening agent and polyvinyl alcohol, which is applied in the fields of soil preparation methods, soil conditioning materials, chemical instruments and methods, etc., to achieve the effects of increasing aggregate structure, reducing soil bulk density, and increasing porosity

Active Publication Date: 2019-01-01
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a kind of soil bulking agent, has solved soil compaction, has made up for the blank problem that foaming technology is applied to the prevention and treatment of soil compaction field

Method used

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  • Soil leavening agent and preparation method

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preparation example Construction

[0020] A kind of preparation method of soil leavening agent of the present invention, concrete operation steps are as follows:

[0021] Step 1, weigh the following materials according to mass percentage: polyvinyl alcohol with a molecular weight of 16000-20000Da 2-17.5%, glycerin 26.5-50%, methylcellulose with a molecular weight of 10000-15000Da 0.8-4%, powder particles with a molecular weight of 10000-15000Da, and more than 97% Ammonium bicarbonate with a diameter of 150-180 μm is 35.5-49%, polyethylene glycol with a molecular weight of 4000-20000Da is 0.5-12.6%, calcium oxide powder is 0.5-12.6%, and the sum of the mass percentages of the above components is 100%.

[0022] Step 2, co-melting polyvinyl alcohol and glycerin in an extruder and then extruding, the melting temperature is 120-130°C; then naturally cooling to room temperature to obtain a blend;

[0023] Step 3, adding methyl cellulose and ammonium bicarbonate to the blend, mixing evenly, and putting it into a granu...

Embodiment 1

[0027] Step 1, weigh the following materials: 5 g of polyvinyl alcohol with a molecular weight of 4000 Da, 80 g of glycerin, 3 g of methyl cellulose with a molecular weight of 10000 Da, 85 g of ammonium bicarbonate with a particle size of more than 97% of the powder being 150 μm, and polyvinyl alcohol with a molecular weight of 8000 Da. Ethylene glycol 1.5g, calcium oxide powder 1.5g.

[0028] Step 2, extruding polyvinyl alcohol and glycerin after co-melting in an extruder, the co-melting temperature is 120°C; then naturally cooling to room temperature to obtain a blend;

[0029] Step 3, adding methyl cellulose and ammonium bicarbonate to the blend, mixing evenly and putting it into a granulator for granulation to obtain mixed soft granules, wherein more than 97% of the mixed soft granules have a particle size of 0.8 mm;

[0030] Step 4, mix polyethylene glycol and calcium oxide powder in the coating pan evenly, then add the mixed soft granules into the coating pan, mix evenly...

Embodiment 2

[0032] Step 1, weigh the following materials: 55g of polyvinyl alcohol with a molecular weight of 20000Da, 100g of glycerin, 8g of methyl cellulose with a molecular weight of 15000Da, 155g of ammonium bicarbonate with a particle size of more than 97% of the powder being 180 μm, and polyvinyl alcohol with a molecular weight of 12000Da. Ethylene glycol 30g, calcium oxide powder 30g;

[0033] Step 2, extruding polyvinyl alcohol and glycerin after co-melting in an extruder, the co-melting temperature is 130°C; then naturally cooling to room temperature to obtain a blend;

[0034] Step 3, adding methyl cellulose and ammonium bicarbonate to the blend, mixing evenly, and putting it into a granulator to granulate to obtain mixed soft granules, wherein more than 97% of the mixed soft granules have a particle size of 1.0mm;

[0035] Step 4, mix polyethylene glycol and calcium oxide powder in the coating pan evenly, then add the mixed soft granules into the coating pan, mix evenly, and m...

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Abstract

The invention discloses a soil leavening agent, which is prepared from the following materials in parts by mass: 2-17.5% of polyvinyl alcohol, 26.5-50% of glycerin, 0.8-4% of methylcellulose, 35.5-49%of ammonium bicarbonate, 0.5-12.6% of polyethylene glycol and 0.5-12.6% of calcium oxide powder, wherein the mass percent sum of the above components is 100%. The invention also discloses a preparation method for the soil leavening agent. The preparation method comprises the following steps: after the polyvinyl alcohol and the glycerin are jointly molten, obtaining co-mixture; adding the methylcellulose and the ammonium bicarbonate into the co-mixture, evenly mixing, and carrying out granulation to obtain mixed soft particles; after the polyethylene glycol and the calcium oxide powder are evenly mixed, adding the mixed soft particles to be evenly mixed to obtain the soil leavening agent. Since the outer layer of the soil leavening agent provided by the invention is a hydrophilic material,i.e., polyethylene glycol, the outer layer is dissolved when meeting water, meanwhile, calcium oxide releases heat when meeting water to accelerate the polyvinyl alcohol and the methylcellulose to beswelled, so that the ammonium bicarbonate is decomposed, carbon dioxide and ammonia gas are released, and soil is fluffy.

Description

technical field [0001] The invention belongs to the technical field of soil improvement methods, in particular to a soil leavening agent, and also to a preparation method of the soil leavening agent. Background technique [0002] In recent years, due to unscientific farming methods and unreasonable fertilization, the soil quality of my country's cultivated land has seriously declined. Soil compaction has become one of the most serious problems affecting my country's agricultural development, and it is one of the main manifestations of soil physical degradation. At present, the main methods of controlling soil compaction in my country include increasing the application of organic fertilizers, increasing the application of microbial agents, appropriate application of soil amendments, and the promotion of dry farming. Among them, the main principle of proper application of soil conditioner is that divalent cations such as silicon, calcium, and iron in the soil conditioner and o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40A01B79/00C09K101/00C09K109/00
CPCA01B79/00C09K17/40C09K2101/00C09K2109/00
Inventor 沈文敖芬王兰
Owner SHAANXI UNIV OF SCI & TECH
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