Preparation method for polyglutamic acid hydrogel and application of polyglutamic acid hydrogel in composite fertilizer

A polyglutamic acid, hydrogel technology, applied in the application, fertilization device, fertilizer mixture and other directions, can solve the problems of low utilization rate of fertilizer, waste, pollution of the environment, etc.

Active Publication Date: 2014-05-21
SHANDONG FREDA BIOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The resource utilization rate is not high, which not only causes waste, increases the cost of farming, but also pollutes the environment
An important cause of low fertilizer use efficiency is the leaching loss of fertilizers, especially nitrogen and potassium fertilizers

Method used

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  • Preparation method for polyglutamic acid hydrogel and application of polyglutamic acid hydrogel in composite fertilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 300g of polyglutamic acid dry powder obtained by fermenting the fermented liquid prepared by Bacillus subtilis, precipitating with an organic solvent and then drying, add water to a volume of 3kg in a 5L beaker, stir and dissolve thoroughly, then add 5.5g of sodium hydrogen succinate epoxy , after stirring evenly, adjust the pH to 7.0 with sodium hydroxide or hydrochloric acid, stir and heat up to 60°C, react for 2 hours, then add 30g of polyethylene glycol glycidyl ether, stir well, adjust the pH to 5.0, heat up to 65°C, and keep warm Reaction, every 30 minutes, stirring for 5 minutes, reacting for 20 hours, to obtain a gel-like product; add the obtained product to soak in absolute alcohol for 12 hours to make it fully dehydrated. Put the dehydrated product into a vacuum drying oven at 55°C for drying, take it out and pulverize it to obtain the polyglutamic acid hydrogel superabsorbent resin.

Embodiment 2

[0016] The following is the application test of the compound fertilizer containing the polyglutamic acid water-absorbing resin prepared according to Example 2 on tomato planting. Wherein the fertilizer used in the control group is commercially available compound fertilizer (N-P 2 o 5 -K 2 O 25-15-8), the test group made compound fertilizer by adding polyglutamic acid superabsorbent resin to the fertilizer of the same brand.

[0017] The compound fertilizer applied in the test group is to add 1% polyglutamic acid water-absorbing resin, the compound fertilizer applied in the test group two is polyglutamic acid water-absorbing resin with an addition of 0.5%, and the compound fertilizer applied in the test group three is polyglutamic acid The amount of water-absorbent resin added is 0.1%. The compound fertilizer polyglutamic acid water-absorbing resin added in the four groups of experiments was 0.05%.

[0018]

[0019] control group test group Test group two ...

Embodiment 3

[0022] The following experiment is the application of polyglutamic acid water-absorbing resin in vegetable fertilizer saving and yield increasing. Wherein the fertilizer used in the control group is commercially available compound fertilizer (N-P 2 o 5 -K 2 O 25-15-8), the experimental group was made by adding polyglutamic acid superabsorbent resin to the fertilizer of the same brand. The following data are the average of the results obtained by repeating more than three times.

[0023]

[0024]

[0025] It can be seen from the above table that the crop yield still increases even though the amount of fertilizer application is reduced, which shows that the polyglutamic acid water-absorbing resin improves the utilization rate of fertilizer, can significantly reduce the amount of fertilizer, and save costs.

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Abstract

The invention relates to a super absorbent resin used for an agriculture fertilizer, specifically to a preparation method for a super absorbent resin containing a polyglutamic acid hydrogel and application of the super absorbent resin in a fertilizer. According to the invention, polyglutamic acid reacts with cross-linking agents like sodium hydrogen epoxysuccinate and polyethylene glycol diglycidyl ether under certain conditions, and then dewatering and drying are carried out so as to obtain a gel resin with high water-absorbing quality; a variety of novel composite fertilizers can be prepared by compounding the polyglutamic acid hydrogel used as the super absorbent resin with various fertilizers; the prepared composite fertilizers have good slow release functions and further have water absorption, water retention and soil adjusting functions and the like through bonding of the fertilizers with the super absorbent resin.

Description

technical field [0001] The invention relates to a superabsorbent resin used for agricultural fertilizers, in particular to a preparation method of the superabsorbent resin containing polyglutamic acid hydrogel and its application in fertilizers. Background technique [0002] Superabsorbent resin can improve soil structure, absorb water and retain water, increase water permeability, air permeability, improve soil moisture retention performance, and increase the effect of pesticides and fertilizers. Since the performance of any fertilizer depends on the availability of soil water, there is an interaction between water and fertilizer, while conventional fertilizers and most slow-release fertilizers do not have the function of water absorption and water retention. Compared with 1987, the amount of chemical fertilizer used in my country in 1997 increased by 99.1%, while grain output increased by only 22.1%. The resource utilization rate is not high, which not only causes waste, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/075C08L77/04C05G3/04C05G3/80
Inventor 李海军朱希强苏移山吴涛凌沛学
Owner SHANDONG FREDA BIOTECH
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