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Attapulgite and zinc lignosulphonate-based interpenetrating network-type water-retention and slow-release zinc fertilizer

An interpenetrating network type and calcium lignosulfonate technology is applied in the field of attapulgite and zinc lignosulfonate-based interpenetrating network type water-retaining and slow-release zinc fertilizers, which can solve the problems of not producing water-retaining and slow-release fertilizers, and achieve Great practical value and strategic significance, the effect of improving mechanical strength and reducing manufacturing costs

Inactive Publication Date: 2013-11-27
NORTHWEST RES INST CO LTD OF C R E C
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no water-retaining and slow-release fertilizer with "slow-release zinc fertilizer, water absorption and moisture conservation" at the same time.

Method used

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  • Attapulgite and zinc lignosulphonate-based interpenetrating network-type water-retention and slow-release zinc fertilizer
  • Attapulgite and zinc lignosulphonate-based interpenetrating network-type water-retention and slow-release zinc fertilizer
  • Attapulgite and zinc lignosulphonate-based interpenetrating network-type water-retention and slow-release zinc fertilizer

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preparation example Construction

[0032] The preparation mechanism of water-retaining slow-release zinc fertilizer of the present invention is as follows: figure 2shown. First, zinc lignosulfonate (also known as wood zinc) is obtained by reacting zinc sulfate with calcium lignosulfonate. Subsequently, in the mixed system of attapulgite and zinc lignosulfonate, the hydrogen atom in the silicon hydroxyl group on the surface of the attapulgite and the hydrogen atom in the phenolic hydroxyl group of zinc lignosulfonate are captured by the initiator (ammonium persulfate) to initiate Primary free radicals, and then initiate acrylic acid (and acrylamide) to form "attapulgite-zinc lignosulfonate-acrylic acid-acrylamide" free radicals, which continue to undergo chain growth polymerization reactions with acrylic acid and acrylamide, And under the action of cross-linking agent (N,N'-methylenebisacrylamide), a three-dimensional polymer resin network structure is formed. In this network structure, since the attapulg...

Embodiment 1

[0036] According to mass percentage, take 0.5% of natural clay attapulgite, 18.85% of calcium lignosulfonate, 55% of acrylic acid, 25% of acrylamide, 0.5% of ammonium persulfate and 0.15% of N,N'-methylenebisacrylamide; The calcium lignosulfonate taken is mixed with a calcium lignosulfonate aqueous solution with a concentration of 40%, then zinc sulfate heptahydrate is weighed according to 30% of the calcium lignosulfonate quality, and zinc sulfate heptahydrate is added to the lignosulfonate solution. Calcium acid aqueous solution, stirring at room temperature for 2 hours, standing still, filtering to obtain zinc lignosulfonate solution; combining and dispersing natural clay attapulgite and zinc lignosulfonate solution in water to form a mixed solution, adding acrylic acid to the mixture solution, and then use sodium hydroxide to adjust the pH value of the mixed solution after adding acrylic acid to 4 to form a solution, add acrylamide to the solution, stir and disperse for 5 m...

Embodiment 2

[0044] According to mass percentage, take 0.9% of natural clay attapulgite, 15% of calcium lignosulfonate, 60.5% of acrylic acid, 21.8% of acrylamide, 1.5% of ammonium persulfate and 0.3% of N,N'-methylenebisacrylamide; The calcium lignosulfonate taken is mixed with a calcium lignosulfonate aqueous solution with a concentration of 35%, then zinc sulfate heptahydrate is weighed according to 36% of the calcium lignosulfonate quality, and zinc sulfate heptahydrate is added to the lignosulfonate Lignosulfonate aqueous solution, stirred at room temperature for 3 hours, left to stand, and filtered to obtain a zinc lignosulfonate solution; the natural clay attapulgite and zinc lignosulfonate solution were combined and dispersed in water to form a mixed solution, and the obtained Add the obtained acrylic acid into the mixed solution, and then use sodium hydroxide to adjust the pH of the mixed solution after adding the acrylic acid to 6 to form a solution, add the obtained acrylic acid ...

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Abstract

The invention provides an attapulgite and zinc lignosulphonate-based interpenetrating network-type water-retention and slow-release zinc fertilizer. The attapulgite and zinc lignosulphonate-based interpenetrating network-type water-retention and slow-release zinc fertilizer is prepared by taking natural clay attapulgite, calcium lignosulphonate, acrylic acid, acrylamide, an initiator and a cross-linking agent in a percentage by mass respectively, wherein the total of the percentages of the constituents is 100%; preparing a calcium lignosulphonate aqueous solution from calcium lignosulphonate, then adding zinc heptahydrate to obtain a zinc lignosulphonate solution; combining natural clay attapulgite and the zinc lignosulphonate solution, and dispersing in water, adding acrylic acid and acrylamide, then adjusting the pH value, adding N,N'-methylene bisacrylamide and ammonium persulfate to perform a cross-linking reaction, so as to generate a compound cross-linked body; and performing vacuum drying and crushing. Relative to the traditional absorbing-fixing zinc fertilizers and physically-blended zinc fertilizers, the slow-release zinc fertilizer has the advantages of being stable in structure, high in water absorption rate, good in slow-release effect and the like.

Description

technical field [0001] The invention belongs to the technical field of ecological environmental protection and agricultural fertilizers, and relates to a slow-release fertilizer and micro-fertilizer in agriculture, in particular to an attapulgite and zinc lignin sulfonate-based interpenetrating network type water-retaining slow-release zinc fertilizer. Background technique [0002] Zinc is an indispensable element of life for animals and plants. The area of ​​zinc deficiency in our country is more than 50%, especially in the northwest plateau, the situation of soil zinc deficiency is more serious. Therefore, the promotion of zinc fertilizer is of great significance to improving the ecological restoration effect and improving the yield and quality of crops in my country, especially in the northwest region. Inorganic zinc fertilizer is used to solve the problem of zinc deficiency in soil, but inorganic zinc is easy to be fixed in a large amount in alkaline soil, and it is eas...

Claims

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Application Information

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IPC IPC(8): C05G3/00
Inventor 熊治文薛春晓李凯崇唐瑜刘贺业
Owner NORTHWEST RES INST CO LTD OF C R E C
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