Method for preparing novel agricultural water-retaining agent and water-retaining agent

An agricultural water-retaining agent and a new type of technology, applied in chemical instruments and methods, applications, agriculture, etc., can solve the problems of loss of water-retaining effect, desertification, land waste and other problems, and achieve the effect of ensuring growth without water shortage

Inactive Publication Date: 2012-10-24
汪永燕 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although it has a good effect in ordinary soil capsules, it is completely unsuitable for water retention in saline-alkali soils
However, there are a large number of saline-alkali lands in the northern part of my country. Due to the inability to grow plants, a large amount of land is abandoned and desertified, resulting in a very serious waste of resources.
Use ordinary starch-based water-retaining agents on saline-alkali land, and the molecules of the water-retaining agent will be eroded by salt-alkali soon and lose the water-retaining effect

Method used

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  • Method for preparing novel agricultural water-retaining agent and water-retaining agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Add 1.2kg of modified starch to prepare 2kg of sodium acrylate aqueous solution, form starch-sodium acrylate graft copolymer after reaction, then add foaming polymerization initiator and directly polymerize into foam in tunnel cellar, after drying and cooling, powder pure spare. Sodium humate is prepared by sodium salt and nitrated humic acid, then modified by esterification with polyhydroxy phosphate, and then added with co-solvent to prepare a reactive black glue. Add the starch-acrylate graft copolymer produced in the above steps to polypropylene small particles and the active black glue solution prepared in the above steps, mix evenly under the action of the dispersant, react after heating to form a resin, and finally cool down, Powder and granulate to get the finished product. Among them, the added humate accounted for 20% of the total mass ratio, the added amount of the dispersant accounted for 6% of the total mass ratio, and the small polypropylene particles acc...

Embodiment 2

[0033] Prepare 5 kg of potassium acrylate aqueous solution and add 4 kg of modified starch to form a starch-potassium acrylate graft copolymer after reaction, then add a foaming polymerization initiator and directly polymerize into a foam in the tunnel cellar. After drying and cooling, it is pulverized spare. Sodium humate is prepared by potassium salt and nitrifying humic acid, then potassium humate is modified by esterification with polyhydroxy phosphate, and then a cosolvent is added to prepare a reactive black glue. Add the starch-potassium acrylate graft copolymer produced in the above steps to polyethylene small particles and the active black glue solution prepared in the above steps and mix evenly under the action of the dispersant, react after heating to form a resin, and finally cool down, Powder and granulate to get the finished product. Among them, the added humate accounted for 35% of the total mass ratio, the added amount of the dispersant accounted for 8% of the...

Embodiment 3

[0035] Prepare 5kg of ammonium acrylate aqueous solution and add 3kg of modified starch to form a starch-ammonium acrylate graft copolymer after reaction, then add a foaming polymerization initiator and directly polymerize into a foam in the tunnel cellar, dry and cool and then pulverize spare. Ammonium humate is prepared by using ammonium salt and nitrated humic acid, and then ammonium humate is modified by esterification with polyhydroxy phosphate, and then a cosolvent is added to prepare a reactive black glue. Add the starch-ammonium acrylate graft copolymer produced in the above steps to polyethylene small particles and the active black glue solution prepared in the above steps and mix evenly under the action of the dispersant, react after heating to form a resin, and finally cool down, Powder and granulate to get the finished product. Among them, the added humate accounted for 50% of the total mass ratio, the added amount of the dispersant accounted for 10% of the total ...

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Abstract

The invention relates to a method for preparing a novel agricultural water-retaining agent and a water-retaining agent which is prepared according to the method. The method comprises the steps: (1) adding modified starch into an acrylate aqueous solution to form a starch-acrylate grafted copolymer, adding a foaming polymerization initiator, directly polymerizing in a tunneled kiln to obtain a foaming body, drying, cooling and grinding the foaming body for later use; (2) modification of humic acid: carrying out esterifying modification on humate using polyhydroxy phosphate, and then adding a complex solubilizer to prepare black glue solution with reactivity; and (3) secondary reaction: adding polypropylene particles and the active black glue solution which is produced in the step (2) into the starch-acrylate grafted copolymer which is produced in the step (1), uniformly mixing under the action of a dispersing agent, heating, reacting to form resin, finally cooling, grinding, and granulating to obtain the end product. The water-retaining agent can protect molecules from being eroded by alkali when being used in the saline-alkali soil, thereby being suitable for the water retention of the saline-alkali soil.

Description

[0001] technical field [0002] The invention relates to a preparation method of a novel agricultural water-retaining agent and the water-retaining agent prepared according to the method. [0003] Background technique [0004] Water retaining agent, that is, super absorbent resin (SAP in English), is a general term for functional polymer materials with high water absorption characteristics. It can absorb deionized water hundreds to thousands of times its own weight, tens to hundreds of times It contains salty water, and has the function of repeatedly absorbing water. After absorbing water, it swells into a hydrogel, and can slowly release 80% to 95% of the held water for crops to absorb and utilize. Because the molecular structure is cross-linked, the water absorbed by the molecular network cannot be squeezed out by general physical methods, so it has strong water retention. [0005] Agricultural water-retaining agents in the prior art are generally starch-type water-retai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/24C08F251/00C08H99/00C09K17/32C09K101/00
Inventor 汪永燕王月明
Owner 汪永燕
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