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A kind of preparation method of water-based acrylic resin modified starch-based hydrogel water retention agent granules

A water-based acrylic acid, starch-based technology, applied in chemical instruments and methods, soil conditioning materials, agricultural machinery and implements, etc., can solve the problems of poor reaction accessibility, long time, short decomposition time, etc., and achieve good dissolution and storage. , sufficient water and fertilizer, the effect of reducing consumption

Active Publication Date: 2022-06-21
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the association of a large number of hydrogen bonds between starch molecules, it mainly exists in the form of aggregate particles, which are difficult to dissolve in water and general organic solvents. Only by diluting and dispersing with water or organic solvents, there are poor reaction accessibility and long time. The grafting rate is low, and the cross-linking bonds mainly occur on the surface of the dispersed starch particles. The polymerization reaction is difficult to be carried out uniformly and thoroughly, which makes the reaction reproducibility poor, so that the water-retaining agent prepared by acrylic resin modified starch still has low hydrogel strength. , poor cohesion, easy to loose and lose, short decomposition time, poor water and fertilizer retention

Method used

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  • A kind of preparation method of water-based acrylic resin modified starch-based hydrogel water retention agent granules

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Experimental program
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Effect test

Embodiment 1

[0046] Embodiment 1 A kind of preparation method of water-based acrylic resin modified starch-based hydrogel water-retaining agent particles

[0047] Include the following steps:

[0048] (1) Preparation of oxidized starch dispersion

[0049] Add 490 g of water and 210 g of corn starch to a 1 L five-necked flask, stir evenly at a speed of 150 r / min, add dilute sulfuric acid to adjust the pH to 3.0, heat up to 50 °C, add 15 mL of 0.1 mol / L ferrous salt complex Combined solution (molar ratio of ferrous sulfate and sodium tartrate 1:2), insert electrode, graphite electrode as anode, titanium electrode as cathode, calomel electrode as reference, connect electrochemical analysis system for constant current electrolysis, current density 10 ~30 A / m 2 . Add 27.3 g of hydrogen peroxide dropwise for about 1 h, during which the temperature rises rapidly. After the temperature is stable, adjust the temperature to 60 °C ~ 70 °C, keep the temperature for 90 min, turn off the electrochemi...

Embodiment 2

[0057] Embodiment 2 A kind of preparation method of water-based acrylic resin modified starch-based hydrogel water-retaining agent particles

[0058] Include the following steps:

[0059] (1) Preparation of oxidized starch dispersion

[0060] Add 490 g of water and 210 g of potato starch to a 1 L five-necked flask, stir evenly at a speed of 150 r / min, add dilute sulfuric acid to adjust the pH to 3.0, heat up to 50 °C, add 18 mL of 0.1 mol / L ferrous salt complex The mixed solution (molar ratio of ferrous sulfate and sodium citrate is 1:2), inserted into the electrode, the graphite electrode is the anode, the titanium electrode is the cathode, and the calomel electrode is the reference, and the electrochemical analysis system is connected for constant current electrolysis. 10~30A / m 2 . Add 31.5 g of hydrogen peroxide dropwise for about 1 h, during which the temperature rises rapidly. After the temperature is stable, adjust the temperature to 60 °C ~ 70 °C, keep the temperatur...

Embodiment 3

[0067] Embodiment 3 A kind of preparation method of water-based acrylic resin modified starch-based hydrogel water-retaining agent particles

[0068] Include the following steps:

[0069] (1) Preparation of oxidized starch dispersion

[0070] Add 490 g of water and 210 g of tapioca starch to a 1 L five-neck flask, stir evenly at a speed of 150 r / min, add dilute sulfuric acid to adjust the pH to 3.0, heat up to 50 °C, add 10 mL of 0.1 mol / L ferrous salt complex Combined solution (molar ratio of ferrous sulfate and sodium oxalate 1:2), insert electrode, graphite electrode as anode, titanium electrode as cathode, calomel electrode as reference, connect electrochemical analysis system for constant current electrolysis, current density 10 ~30 A / m 2 . Add 21.0 g of hydrogen peroxide dropwise for about 1 h, during which the temperature rises rapidly. After the temperature is stable, adjust the temperature to 60 °C ~ 70 °C, keep the temperature for 90 min, turn off the electrochemi...

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Abstract

The invention provides a method for preparing water-based acrylic resin modified starch-based hydrogel water-retaining agent particles, which includes preparing oxidized starch dispersion liquid, preparing vinylated oxidized starch dispersion liquid, preparing polyacrylate prepolymer emulsion, and gel reaction . The invention utilizes a vinyl silane coupling agent to carry out vinyl modification, adopts an all-water phase free radical polymerization reaction, realizes cross-linking copolymerization and gelation of water-based acrylic resin and vinyl oxidized starch, and develops a new type of starch / Water-based acrylic resin composite hydrogel material. After thermal drying and granulation, water-based acrylic resin modified starch-based hydrogel water-retaining agent granules are prepared, which exhibit excellent structural bearing strength, water absorption, water retention, fertilizer retention, and biodegradability. As a natural polymer-based composite hydrogel water-retaining and fertilizer-retaining agent, it will show broad application prospects in modern precision agriculture.

Description

technical field [0001] The invention relates to a preparation method of water-based acrylic resin-modified starch-based hydrogel water-retaining agent particles, belonging to the field of natural polymer materials. Background technique [0002] Worldwide, food production losses from drought stress may exceed the combined yield losses from other factors. my country's dry land area accounts for 52.5% of the country's total land area. Drought is an important factor restricting the sustainable development of my country's agriculture. In the past 10 years, my country's agricultural water consumption has accounted for more than 60% of the country's total water consumption. Utilize limited precipitation resources to ensure the sustainable development of agricultural production. The application of water-retaining agent is an effective measure, which can achieve the goals of improving soil, saving water and increasing production, especially in the dry farming areas of northern my co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F251/00C08F220/06C08F220/56C08F220/34C08F222/06C08B31/18C09K17/32C09K101/00
CPCC08B31/185C08F251/00C09K17/32C09K2101/00C08F220/06C08F222/06C08F220/56C08F220/34Y02A40/10
Inventor 杨茂党旭岗韩文佳李彦春
Owner QILU UNIV OF TECH
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