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Production of expanding roseite-organic composite water absorbing and retaining materials

A technology of expanded vermiculite and water-retaining materials, which is applied in the directions of organic fertilizers, soil conditioning materials, chemical instruments and methods, etc., can solve the problems of poor water-retention performance, difficulty in meeting application requirements, and limited water absorption.

Inactive Publication Date: 2008-01-30
SHIHEZI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such water-absorbing materials have limited water absorption and poor water retention after absorbing water, which is difficult to meet application requirements.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Soak 3g of expanded vermiculite in 8% sodium hydroxide solution for 24 hours to obtain ion-exchanged expanded vermiculite. After removal, it was mixed with a mixture of 20 g of acrylic acid monomer and 10 g of acrylamide monomer and 0.009 g of N-N bisacrylamide and 60 ml of water. After mixing, add to a ball mill and mill for 2 hours. Then 0.06 g of ammonium persulfate was added, and heated in a water bath at 50° C. for 2 hours to polymerize. Finally, the polymer is dried in a vacuum oven at 65° C., and crushed to obtain a vermiculite-organic composite water-retaining and absorbing material. The product can absorb 146g / g of tap water and 285g / g of distilled water, and does not stick to the wall of the device during preparation.

Embodiment 2

[0014] Soak 36g of expanded vermiculite in 15% sodium hydroxide solution for 48 hours to obtain ion-exchanged expanded vermiculite. After removal, it was mixed with a mixture of 20 g of acrylic acid monomer and 10 g of acrylamide monomer and 0.039 g of N-N bisacrylamide and 90 ml of water. After mixing, add to a ball mill and mill for 4 hours. Then, 0.6 g of potassium persulfate was added, and heated in a water bath at 65°C for 0.5 hour to polymerize. Finally, the polymer is dried in a vacuum oven at 70° C., and crushed to obtain a vermiculite-organic composite water-retaining and absorbing material. The product can absorb 105g / g of tap water and 208g / g of distilled water, has low cost, and does not stick to the wall of the device during preparation.

Embodiment 3

[0016] Soak 20 g of expanded vermiculite in 12% sodium hydroxide solution for 36 hours to obtain ion-exchanged expanded vermiculite. After removal, it was mixed with a mixture of 20 g of acrylic acid monomer and 10 g of acrylamide monomer and 0.025 g of N-N bisacrylamide and 70 ml of water. After mixing, add to a ball mill and mill for 3 hours. Then 0.3 g of ammonium persulfate was added, and heated in a water bath at 60° C. for 1.5 hours to polymerize. Finally, the polymer is dried in a vacuum oven at 65° C., and crushed to obtain a vermiculite-organic composite water-retaining and absorbing material. The product can absorb 130g / g of tap water and 252g / g of distilled water.

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PUM

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Abstract

Production of expanded vermiculite-organic composite water absorbing and retaining material is carried out by taking expanded vermiculite, acroleic aicd and acrylamide monomer as raw materials, ion exchanging, high-energy ball milling, monomer intercalating and in-situ polymerizing to obtain the final material. The material consists of acroleic acid and acrylamide in mass proportion of 2:1, expanded vermiculite 10-120%, initiating agent 0.2-2% cross-linking 0.03-0.13%, tap water 100-150g / g and distilled water 200-300g / g. It is cheap, has excellent thermal insulating, fertility-retaining and slow-releasing functions, long effect and high strength. It can be used for agriculture, forestry and gardening.

Description

Technical field: [0001] The invention relates to an organic-inorganic composite water-absorbing and water-retaining material for agriculture and forestry, in particular to an expanded vermiculite-organic composite water-absorbing and water-retaining material and a preparation method thereof. Background technique: [0002] High water absorption and water retention material is a new type of functional material with particularly strong water absorption capacity. It can absorb water hundreds or even thousands of times its own weight, and its water retention capacity is particularly good, and it is not easy to dehydrate even under pressure. The unique properties of superabsorbent and water-retaining materials make them widely used in agriculture, forestry and gardening, medicine, sanitary products, civil engineering, daily chemistry, petrochemical and other fields. [0003] At present, there are mainly two types of water-retaining and water-absorbing materials: polymer type and c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/40
Inventor 李刚刘开平梁庆宣魏晓丽马玉薇孙婧吕德生赵以琴
Owner SHIHEZI UNIVERSITY