Modified alkali lignin chelated zinc fertilizer and preparation method thereof

A technology of alkali lignin and chelated zinc, applied in fertilization devices, fertilizer mixtures, applications, etc., can solve the problems of weak chelating ability and few varieties, and achieve improved chelating ability, strong chelating ability, and renewable raw materials. Effect

Active Publication Date: 2013-11-20
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the current problems that there are few varieties of lignin chelated micro-fertilizers and weak chelating ability, the purpose of the present invention is to provide a modified lignin chelated zinc fertilizer, increase the types of lignin chelated micro-fertilizers, and improve its chelating ability and fertilizer efficiency, and broaden the resource utilization of alkali lignin

Method used

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  • Modified alkali lignin chelated zinc fertilizer and preparation method thereof
  • Modified alkali lignin chelated zinc fertilizer and preparation method thereof
  • Modified alkali lignin chelated zinc fertilizer and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Take 100g of wheatgrass alkali lignin powder and add it to water, adjust the pH value to 10 with NaOH solution with a mass percentage concentration of 50%, stir evenly and dissolve it into an aqueous solution with a mass percentage concentration of 40%; add 40g of sarcosine, drop epoxy chlorine Propane 50g (dropped within 30min), then heated up to 80°C and reacted for 2h; then adjusted the pH value of the system to 11 with NaOH solution with a concentration of 50% by mass percentage, added dropwise 30g of bromoacetic acid, and reacted at 80°C for 1.5 h; then adjust the pH value of the system to 6 with dilute hydrochloric acid with a concentration of 20% by mass, add 25g of zinc sulfate, and perform a chelation reaction at 55°C for 2 hours, and obtain a modified alkali lignin chelated zinc fertilizer after the reaction.

Embodiment 2

[0030] Take 100g of wheatgrass alkali lignin powder and add it to water, adjust the pH value to 9 with NaOH with a concentration of 50% by mass under stirring, and dissolve it evenly to form an aqueous solution with a concentration of 30% by mass; add 45g of glycine, and dropwise add epichlorohydrin 40g (dropped within 30 minutes), then heated up to 90°C and reacted for 3h; then adjusted the pH value of the system to 12 with NaOH solution with a mass percentage concentration of 50%, added dropwise 20g of bromoacetic acid, and reacted at 75°C for 2h; Then adjust the pH value of the system to 5 with dilute hydrochloric acid with a concentration of 30% by mass, add 30 g of zinc sulfate, and perform a chelation reaction at 60° C. for 0.5 h. After the reaction, a modified alkali lignin chelated zinc fertilizer is obtained.

Embodiment 3

[0032] Take 100g of bamboo pulp alkali lignin powder and add it to water, adjust the pH value to 11 with NaOH with a concentration of 50% by mass under stirring, and dissolve it evenly to form an aqueous solution with a concentration of 35% by mass; add 15g of tyrosine and aspartic acid acid 20g, add 55g of epichlorohydrin dropwise (control the dripping within 30min), then raise the temperature to 75°C and react for 2.5h; then adjust the pH value of the system to 10 with NaOH solution with a concentration of 50% by mass percentage, add bromine dropwise 15g of acetic acid, reacted at 90°C for 1h; then adjusted the pH value of the system to 7 with dilute hydrochloric acid with a mass percentage concentration of 25%, added 20g of zinc sulfate, and carried out chelation reaction at 70°C for 1h, and obtained modified Alkali lignin chelated zinc fertilizer.

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Abstract

The invention discloses a modified alkali lignin chelated zinc fertilizer and a preparation method thereof. The preparation method comprises the following steps: adding alkali lignin powder into water, regulating the pH value, and dissolving to obtain a 30-40 wt% water solution; adding amino acid, dropwisely adding epoxy chloropropane, heating to 75-95 DEG C, and reacting for 2-3 hours; regulating the pH value to 10-12, dropwisely adding bromoacetic acid, and reacting at 70-90 DEG C for 1-2 hours; and finally, regulating the pH value of the system to 5-7 with a dilute hydrochloric acid solution, adding zinc sulfate, and carrying out chelation reaction at 50-70 DEG C for 0.5-2 hours, thereby obtaining the modified alkali lignin chelated zinc fertilizer after the reaction finishes. The chelated microelement fertilizer molecules have abundant hydroxy and carboxyl groups, and the N atom has lone electron pairs which can form composite coordination with metallic ions; and thus, the fertilizer has high chelation capacity, and the maximum complexation quantity for zinc ions is approximate to the level of EDTA (ethylene diamine tetraacetic acid); and the pot incubation test indicates that the fertilizer has an obvious yield increase action on crops.

Description

technical field [0001] The invention relates to a chelate micro-fertilizer, in particular to a modified alkali lignin chelated zinc fertilizer and a preparation method thereof. Background technique [0002] For crops, the essential nutrients whose content is between 0.2 and 200 mg / kg (by dry matter weight) are called trace elements. Trace elements are essential nutrients for crops, and the trace elements needed by crops mainly come from the soil. Therefore, when the supply of trace elements in the soil is insufficient, the growth and development of many crops will be affected, and the yield and quality will decline. So far, there are seven kinds of trace elements that have been proved to be essential for crops, including zinc (Zn), boron (B), manganese (Mn), molybdenum (Mo), copper (Cu), iron (Fe), and chlorine (Cl). A large number of experiments have shown that rational application of micro-fertilizers is an important means to increase the content of trace elements in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05D9/02
Inventor 邱学青高伟庞煜霞楼宏铭邓永红周明松
Owner SOUTH CHINA UNIV OF TECH
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