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Method for preparing water absorbing and holding composite with lotus leaves

A composite material and lotus root leaf technology are applied in the field of preparing water-absorbing and water-retaining composite materials by using lotus root leaves, which can solve the problems of difficult agricultural production in dry farming, low afforestation survival rate, soil erosion and the like, and achieve good biocompatibility and degradability. , Solve the effect of land desertification and high water retention rate

Inactive Publication Date: 2014-06-04
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: the present invention proposes a novel superabsorbent resin prepared by using lotus root leaves as raw materials, and uses the novel superabsorbent resin as a water-absorbing and water-retaining material to solve land desertification, low survival rate of afforestation, and drought. Agricultural production difficulties, serious soil erosion and other problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Harvest and dry the lotus root leaves;

[0021] (2) crushing and sieving the lotus root leaves after drying;

[0022] (3) Immerse the sieved lotus root leaves in a sodium hydroxide solution with a mass concentration of 20%, cook and stir for 30 minutes at a temperature of 100° C., so that the lotus root leaves are fully swollen in the lye, and at the same time destroy the lotus root leaves. Crystal structure, improved accessibility and reactivity, thereby increasing the grafting rate of lotus root leaves and the water absorption rate of the water-absorbing agent.

[0023] (4) washing the boiled lotus root leaves to neutrality and drying;

[0024] (5) immerse the lotus root leaf after drying in the ethanol solution of mass concentration 80%, stir;

[0025] (6) Add a sodium hydroxide solution with a mass concentration of 50% according to a liquid-to-liquid ratio of 1:1, and stir for 60 minutes at a temperature of 30°C;

[0026] (7) add chloroacetic acid at a mass r...

Embodiment 2

[0032] (1) Harvest and dry the lotus root leaves;

[0033] (2) crushing and sieving the lotus root leaves after drying;

[0034] (3) Immerse the sieved lotus root leaves in a sodium hydroxide solution with a mass concentration of 25%, cook and stir for 30 minutes at a temperature of 120° C. to fully swell the lotus root leaves in the lye and destroy the lotus root leaves at the same time. Crystal structure, improved accessibility and reactivity, thereby increasing the grafting rate of lotus root leaves and the water absorption rate of the water-absorbing agent.

[0035] (4) washing the boiled lotus root leaves to neutrality and drying;

[0036] (5) immerse the lotus root leaf after drying in the ethanol solution of mass concentration 85%, stir;

[0037] (6) Add a sodium hydroxide solution with a mass concentration of 55% according to a liquid-to-liquid ratio of 1:1, and stir for 60 minutes at a temperature of 40°C;

[0038] (7) Add chloroacetic acid according to the mass ra...

Embodiment 3

[0044] (1) Harvest and dry the lotus root leaves;

[0045] (2) crushing and sieving the lotus root leaves after drying;

[0046] (3) Immerse the sieved lotus root leaves in a sodium hydroxide solution with a mass concentration of 30%, cook and stir for 30 minutes at a temperature of 150°C to fully swell the lotus root leaves in the lye and destroy the lotus root leaves at the same time. Crystal structure, improved accessibility and reactivity, thereby increasing the grafting rate of lotus root leaves and the water absorption rate of the water-absorbing agent.

[0047] (4) washing the boiled lotus root leaves to neutrality and drying;

[0048] (5) immerse the lotus root leaf after drying in the ethanol solution of mass concentration 90%, stir;

[0049] (6) Add a sodium hydroxide solution with a mass concentration of 60% according to a liquid-to-liquid ratio of 1:1, and stir for 60 minutes at a temperature of 50°C;

[0050] (7) Add chloroacetic acid according to the mass rati...

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Abstract

The invention relates to the technical field of water absorbing and holding composites, and particularly relates to a method for preparing the water absorbing and holding composite with lotus leaves. The method comprises steps of firstly harvesting, drying, smashing and sieving the lotus leaves, immersing into sodium hydroxide solution and boiling, stirring, so as to allow the lotus leaves to fully swell in alkali liquor, washing the boiled lotus leaves to be neutral and drying, immersing into ethanol solution, adding sodium hydroxide, chloroacetic acid and ethanol solution, washing the reactant to be neutral and drying, adding acrylic acid, a cross-linking agent and a foaming agent, and dewatering, drying, smashing and sieving the final product, so as to obtain the water absorbing and holding composite. The composite has characteristics of having good water absorbing performance, high water absorbing speed, excellent water retention capacity, and strong mold resistance, and being easy to degrade, and can be widely used in fields like agriculture and forestry.

Description

technical field [0001] The invention relates to the technical field of water-absorbing and water-retaining composite materials, in particular to a method for preparing water-absorbing and water-retaining composite materials by using lotus root leaves. Background technique [0002] In order to solve the problems of land desertification, low survival rate of afforestation, difficulties in dry agricultural production, and serious soil erosion, my country has vigorously developed and applied water-absorbing and water-retaining materials in recent years. At present, there are mainly synthetic water-absorbing agents, starch-based water-absorbing agents and cellulose. base absorbent. Among them, the synthetic water-absorbing agent has good water absorption and water retention performance, but it is not easy to degrade in the environment; the water absorption capacity of the cellulose-based water-absorbing agent is not as good as that of the starch-based water-absorbing agent, but it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/02
Inventor 万玉山黄利涂保华邵敏王莉
Owner CHANGZHOU UNIV
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