A kind of preparation method of polyglutamic acid hydrogel and its application in compound fertilizer

A technology of polyglutamic acid and hydrogel, applied in application, fertilization equipment, fertilizer mixture, etc., can solve the problems of low fertilizer utilization rate, waste, and increased farming costs

Active Publication Date: 2016-02-03
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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  • A kind of preparation method of polyglutamic acid hydrogel and its application in compound 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 O25-15-8), 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] It can be concluded from field experiments that, ...

Embodiment 3

[0021] 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 O25-15-8), 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.

[0022]

[0023] 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 superabsorbent resin used for agricultural fertilizers, in particular to a preparation method of a superabsorbent resin containing polyglutamic acid hydrogel and its application in fertilizers. The invention combines polyglutamic acid with Epoxy sodium hydrogen succinate, polyethylene glycol glycidyl ether and other cross-linking agents react under certain conditions, and then dehydrate and dry to obtain a superabsorbent gel resin. The hydrogel is used as a superabsorbent resin and various fertilizers. Compounding can prepare various new compound fertilizers. The compound fertilizer has a good slow-release function, and at the same time, it has the functions of water absorption and water retention, soil regulation and the like through the combination of the fertilizer and the water-absorbing 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 Patents(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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