A kind of preparation method of aqueous polyurethane modified starch-based liquid mulch film

A technology of water-based polyurethane and liquid mulch, applied in botany equipment and methods, horticulture, plant protection covers, etc., can solve the problem that the product performance cannot meet the theoretical assumptions, the water absorption rate and hydrophobicity can not be guaranteed at the same time, and the polymerization reaction is difficult to be uniform and thorough To achieve good soil structure improvement and water retention, good biodegradability, and good biodegradability

Active Publication Date: 2022-04-05
QILU UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, since ST is insoluble in organic solvents such as acetone, toluene, and DMF, there are many problems when diluting and dispersing with organic solvents alone, such as using a large amount of organic solvents, long reaction time, low grafting rate, and cross-linking mainly occurs in ST disperses on the surface of the particles, and the polymerization reaction is difficult to proceed uniformly and thoroughly, resulting in poor reaction reproducibility and product performance that cannot meet the theoretical assumptions. That is, the water-based polyurethane modified starch-based liquid mulching film prepared by the existing technology has low tensile strength of the film. , unable to ensure water absorption and hydrophobicity at the same time; poor effect on soil structure improvement and cannot be completely degraded

Method used

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  • A kind of preparation method of aqueous polyurethane modified starch-based liquid mulch film
  • A kind of preparation method of aqueous polyurethane modified starch-based liquid mulch film
  • A kind of preparation method of aqueous polyurethane modified starch-based liquid mulch film

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Embodiment 1

[0049] A preparation method of water-based polyurethane modified starch-based liquid mulch film, comprising the following steps:

[0050] (1) Preparation of oxidized starch dispersion

[0051] Add 490 g of water and 210 g of cornstarch to a 1 L five-necked flask at a speed of 150 r / min, stir evenly, add dilute sulfuric acid to adjust the pH to 3.0, raise the temperature to 50°C, and add 15 mL of 0.1 mol / L ferrous salt complex Combined solution (molar ratio of ferrous sulfate to sodium tartrate 1:2), insert electrodes, graphite electrode as anode, titanium electrode as cathode, calomel electrode as reference, connect to electrochemical analysis system for constant current electrolysis, current density 10 ~30 A / m 2 . Add 31.5 g of hydrogen peroxide dropwise for about 1 hour. During this period, the temperature rises rapidly. After the temperature is stable, adjust the temperature to 60°C-70°C and keep it warm for 90 minutes. Turn off the electrochemical analysis system, take o...

Embodiment 2

[0064] A preparation method of water-based polyurethane modified starch-based liquid mulch film, comprising the following steps:

[0065] (1) Preparation of oxidized starch dispersion

[0066] Add 490 g of water and 210 g of potato starch into a 1 L five-necked flask at a speed of 150 r / min, stir evenly, add dilute sulfuric acid to adjust the pH to 3.0, raise the temperature to 50°C, and add 10 mL of 0.1 mol / L ferrous salt complex Combined solution (molar ratio of ferrous sulfate to sodium citrate 1:2), insert electrodes, graphite electrode as anode, titanium electrode as cathode, calomel electrode as reference, connect to electrochemical analysis system for constant current electrolysis, current density 10~30 A / m 2 . Add 21 g of hydrogen peroxide dropwise for about 1 hour. During this period, the temperature rises rapidly. After the temperature is stable, adjust the temperature to 60°C-70°C and keep it warm for 90 minutes. Turn off the electrochemical analysis system, take ...

Embodiment 3

[0079] A preparation method of water-based polyurethane modified starch-based liquid mulch film, comprising the following steps:

[0080] (1) Preparation of oxidized starch dispersion

[0081] Add 490 g of water and 210 g of sweet potato starch into a 1 L five-necked flask, and stir at a speed of 150 r / min, then add dilute sulfuric acid to adjust the pH to 3.0, raise the temperature to 50°C, and add 12 mL of 0.1 mol / L ferrous salt complex Combined solution (molar ratio of ferrous sulfate to sodium oxalate 1:2), insert electrodes, graphite electrode as anode, titanium electrode as cathode, calomel electrode as reference, connect to electrochemical analysis system for constant current electrolysis, current density 10 ~30 A / m 2 . Add 25.2 g of hydrogen peroxide dropwise for about 1 hour. During this period, the temperature rises rapidly. After the temperature is stable, adjust the temperature to 60°C-70°C and keep it warm for 90 minutes. Turn off the electrochemical analysis sy...

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Abstract

The invention provides a method for preparing a water-based polyurethane modified starch-based liquid mulch film. The preparation method includes preparing an oxidized starch dispersion, preparing an aminated oxidized starch dispersion, preparing a polyurethane prepolymer, and aqueous phase emulsion polymerization. The present invention oxidizes ST through clean and efficient electro-Fenton technology, improves the accessibility of the reaction, enhances the hydration dispersibility of starch molecules and the reactivity of surface hydroxyl groups, and then uses aminosilane coupling agent to carry out amination modification , using aqueous phase emulsion polymerization to achieve effective graft copolymerization of waterborne polyurethane (WPU) and aminated oxidized starch (AOST), and developed a new type of waterborne polyurethane‑starch composite (AOST‑g‑WPU). As an environmentally friendly biomass-based liquid mulch material, AOST‑g‑WPU exhibits excellent soil association, water absorption, water retention, biocompatibility and degradability.

Description

technical field [0001] The invention relates to a preparation method of a water-based polyurethane modified starch-based liquid mulch, which belongs to the field of natural polymer materials. Background technique [0002] With the increasing depletion of petroleum resources and the increasing attention of the government and the public to the environmental problems caused by white plastic pollution, high molecular polymer materials prepared from petrochemical products can no longer meet the needs of the development of the entire human society. Look to those green, cheap, renewable, biodegradable natural polymers. Starch (ST) is widely used in agricultural mulch, industrial foam mulch, food packaging, etc. because of its green, cheap, renewable and biodegradable properties. In 1972, Griffin proposed for the first time to use a screw extruder to prepare biodegradable starch-based polyethylene composites for agricultural mulching. However, experiments have confirmed that this ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L3/10C08L75/08C08L75/06C08J5/18A01G13/02C08B31/18C08G18/66C08G18/48C08G18/42C08G18/10C08G18/34C08G18/32
CPCC08J5/18A01G13/0275C08B31/18C08B31/185C08G18/4854C08G18/4825C08G18/4238C08G18/10C08J2303/10C08J2475/08C08J2475/06A01G2013/004C08G18/348C08G18/3206
Inventor 杨茂党旭岗韩文佳李彦春
Owner QILU UNIV OF TECH
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