Allylthiourea modified konjac glucomannan copolymer material and slow-release nitrogen fertilizer

A technology of konjac glucomannan and allyl thiourea is applied in the direction of fertilizer form, fertilization device, fertilizer mixture, etc., to achieve the effect of promoting maximum utilization rate, enhancing air permeability and strong renewability of raw materials

Active Publication Date: 2013-01-09
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, research and development of new konjac materials, improving its water absorption, salt absorption and fertilizer retention, and slow-release materials that inhibit soil nitrification to a certain extent are rarely reported on slow-release fertilizers.

Method used

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  • Allylthiourea modified konjac glucomannan copolymer material and slow-release nitrogen fertilizer
  • Allylthiourea modified konjac glucomannan copolymer material and slow-release nitrogen fertilizer
  • Allylthiourea modified konjac glucomannan copolymer material and slow-release nitrogen fertilizer

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Experimental program
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Effect test

Embodiment 1

[0029] Embodiment 1, the preparation method of allyl thiourea modified KGM copolymer slow-release material:

[0030] With KGM as the basic composition, in N 2 Under protection, fully swell in 80% ethanol, slowly add initiator Fe 2+ / H 2 o 2 , through N 2 After 15 minutes, add monomer allylthiourea, after 1.5 hours of reaction, slowly heat up to 80°C, add 10% NaOH solution under constant stirring, adjust pH to neutral, wash with acetone and 90% ethanol respectively, filter, After drying, it becomes allylthiourea modified KGM copolymer slow-release material. During synthesis, the grafting rate is controlled to be 10-50%, more preferably 35-40%.

[0031] The konjac glucomannan used in the allylthiourea modified KGM copolymer slow-release material process is industrial grade, with a molecular weight of 5.0×10 5 ~1.0×10 6 , Polymerization degree 500~600; Allyl thiourea, molecular weight 116, chemically pure, content ≥ 99.5%; Structural formula:

[0032] The allylthiourea ...

Embodiment 2

[0037] (1) Pour 100g of urea into a container with a mechanical stirrer, raise the temperature of the stirrer to 80-90°C to make the urea into a molten state, slowly add 1.5g of a copolymer slow-release material with a graft rate of 39%, and continue After stirring for 10-15 minutes, blend and granulate;

[0038] (2) While keeping the temperature inside the coating machine at 60-65°C, spray 0.8g of coating material so that the coating agent is evenly wrapped on the surface of the fertilizer, and the control time is 10-20min; then spray the copolymer for slow release Material;

[0039] (3) Cool and solidify to produce a new type of slow-release nitrogen fertilizer with high water retention and fertilizer retention, which can inhibit soil nitrification. The modified KGM material slow-release fertilizer can be in the shape of flakes, granules or cylinders.

Embodiment 3

[0040] Embodiment 3: The preparation method is as described in Embodiment 2, the difference is that the components are as follows, all in parts by mass:

[0041] A slow-release fertilizer containing an allylthiourea-modified KGM copolymer coating material. In the slow-release fertilizer, in parts by mass: 100 parts by mass, 0.1-10 copolymer slow-release materials, and 0.1-10 coating agents 8.

[0042] The coating agent is one or more of sugarcane peel, orange peel, pomelo peel, peanut shell, bran, bran powder, which is processed into a particle size of 200 mesh after screening, drying, crushing and sieving.

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Abstract

The invention relates to an allylthiourea modified konjac glucomannan (KGM) copolymer coating material and a slow-release nitrogen fertilizer. The method comprises a preparation method of the coating mainly made of the modified KGM copolymer and a preparation method of the coated slow-release fertilizer. The optimization conditions of super-absorbent property, fertilizer-keeping property, soil nitrification resistance and the preparation technology and parameters of the slow-release fertilizer can be obtained, and the problem of evaluating the slow-release effect of the coating can be solved. The preparation technology of the coated slow-release fertilizer is simple, the fertilizer is cheap; when the coated slow-release fertilizer is prepared, the coating material can be used as both a coating agent and an adhesive; the water-absorbing property and fertilizer-keeping property of the coating material are respectively increased to 600 times and 350 times as compared with those of konjaku flour, thus the slow-release effect is obviously increased; and the coating material can be completely degraded, no eco-environmental risk is caused, the chemical fertilizer can be utilized to the greatest extent and the pollutions of the chemical fertilizer to the agroecological environment can be reduced.

Description

technical field [0001] The invention relates to a preparation method of an allylthiourea modified konjac glucomannan (KGM) copolymer slow-release material; the invention also relates to a slow-release fertilizer prepared by using the slow-release material. Background technique [0002] In recent years, the huge waste of resources caused by the loss of soil fertilizer, the deterioration of the ecological environment, and the impact on crop quality and yield economy have received keen attention from all walks of life. After urea is applied to the soil, it can be completely converted into NH in 4-5 days under the action of urease 3 and CO 2 , NH 3 Part of the N in the soil is adsorbed by the soil for use in the early stage of plant growth, and a considerable part of the NH 3 It is acted by soil microorganisms into nitrite, nitrate and nitrogen oxides, causing environmental pollution. The preparation of Slow Release Urea (SRU for short) by coating technology is one of the mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C05G3/08C05G5/00C05G3/90
Inventor 黄应平蒋悦刘立明张战利
Owner CHINA THREE GORGES UNIV
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