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Oxidized wheat starch and urea-formaldehyde resin cross-linked polymerization slow-release material for slow-release fertilizer and preparation method thereof

A technology of wheat starch and cross-linking polymerization is applied in the agricultural field, which can solve the problems of resource waste, economic loss and fertilizer utilization rate reduction, and achieve the effects of saving energy, reducing mass fraction, and strongly adsorbing water molecules and nutrients.

Inactive Publication Date: 2018-01-05
刘国备
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Problems solved by technology

However, the high fertilizer application rate has brought many side effects, resulting in lower fertilizer utilization rate, resulting in serious waste of resources and huge economic losses

Method used

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Embodiment Construction

[0016] The oxidized wheat starch and urea-formaldehyde resin cross-linked and polymerized slow-release material for the slow-release fertilizer of the present embodiment is prepared by the following steps:

[0017] (1) Add urea and 37% formaldehyde solution into the reaction vessel at a mass ratio of 1:4, mix and stir evenly, adjust the pH of the system to 9, raise the temperature to 75°C, and stir with constant temperature magnetic force for 100 minutes to obtain prepolymerization Urea-formaldehyde solution;

[0018] (2) Add wheat starch and deionized water equivalent to 12 times the weight of wheat starch into the reaction vessel, place in a constant temperature water bath at 80°C, and gelatinize with constant temperature magnetic stirring for 40min; reduce the temperature to 60°C, add sulfurous acid Iron solution, mixed and stirred for 15 minutes, slowly added 30% hydrogen peroxide solution dropwise, continued to stir at constant temperature for 4 hours, filtered, the filte...

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Abstract

An oxidized wheat starch and urea-formaldehyde resin cross-linked polymerization slow-release material for a slow-release fertilizer is characterized by being prepared by the following steps: a prepolymer urea formaldehyde solution is firstly prepared, then ferrous sulphate is used for catalysis, and wheat starch is oxidized with hydrogen peroxide to obtain oxidized wheat starch; and finally underweak acid and medium-and-low temperature conditions, oxidized wheat starch and the prepolymer urea formaldehyde solution are subjected to cross-linked polymerization to obtain the oxidized wheat starch and urea-formaldehyde resin cross-linked polymerization slow-release material for a slow-release fertilizer. The slow-release material of the invention is obtained by cross-linked polymerization ofoxidized starch and urea-formaldehyde resin. The raw materials are nontoxic, biodegradable, green, environmental and safe; cost is low; and the preparation method is simple and easy for industrial production.

Description

technical field [0001] The invention belongs to the field of agriculture, and in particular relates to a slow-release material for slow-release fertilizers, which is cross-linked and polymerized by oxidized wheat starch and urea-formaldehyde resin, and a preparation method thereof. Background technique [0002] Chemical fertilizer plays an important role in agricultural production and has played a huge role in promoting the development of agriculture. It is known as "plant food". Fertilizer is the most important material input in agricultural production, accounting for about 50% of all means of production expenditure. So far, the application of chemical fertilizers is still the most effective and convenient measure to increase grain production. According to the statistics of the Food and Agriculture Organization of the United Nations (FAO), the application of chemical fertilizers can increase the yield of crops by 56%-58%, and increase the total grain output by 31%-32%. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/24C08G12/12C08B31/18C05G3/00
Inventor 刘国备
Owner 刘国备
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