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Preparation method of cassava residue/polyvinyl alcohol semi-penetrating network super absorbent microspheres

A technology of polyvinyl alcohol and cassava dregs, which is applied in the field of superabsorbent resin preparation, can solve the problems of slow water-absorbing materials, etc., and achieve the effects of increasing water absorption speed, low viscosity of the system, and promoting sustainable development

Pending Publication Date: 2021-10-08
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the water-absorbent material absorbs blood and urine at a slow speed, so that it can be used in personal hygiene products

Method used

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  • Preparation method of cassava residue/polyvinyl alcohol semi-penetrating network super absorbent microspheres

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Cassava residue pretreatment: The cassava residue (CR) is mechanically crushed and passed through a 50-mesh sieve. Weigh 100 parts of sieved cassava residue and 80 parts of sodium hydroxide into a beaker, then measure 2000 parts of ionized water into the beaker, stir and react in a constant temperature water bath at 80°C for 2 hours, after the reaction is completed, take out the reaction solution and centrifuge and wash until neutral The above-mentioned cassava residue and 25 parts of sodium hydroxide, 20 parts of sodium bicarbonate are poured into the large beaker together, adding 1000 parts of deionized water, and then 75 parts of glacial acetic acid. Mechanically stir and react at 80°C for 6 hours, take out the centrifuge and wash the paint until it is neutrally dry, and then pulverize to obtain the treated cassava residue.

[0029] (2) Preparation of modified bentonite: Weigh 1 part of bentonite and 50 parts of ethyl acetate into a beaker, stir ultrasonically fo...

Embodiment 2

[0036] (1) Cassava residue pretreatment: The cassava residue (CR) is mechanically crushed and passed through a 50-mesh sieve. Weigh 100 parts of sieved cassava residue and 80 parts of sodium hydroxide into a beaker, then measure 2000 parts of ionized water into the beaker, stir and react in a constant temperature water bath at 80°C for 2 hours, after the reaction is completed, take out the reaction solution and centrifuge and wash until neutral The above-mentioned cassava residue and 25 parts of sodium hydroxide, 20 parts of sodium bicarbonate are poured into the large beaker together, adding 1000 parts of deionized water, and then 75 parts of glacial acetic acid. Mechanically stir and react at 80°C for 6 hours, take out the centrifuge and wash the paint until it is neutrally dry, and then pulverize to obtain the treated cassava residue.

[0037] (2) Preparation of modified bentonite: Weigh 1 part of bentonite and 50 parts of ethyl acetate into a beaker, stir ultrasonically fo...

Embodiment 3

[0044] (1) Cassava residue pretreatment: The cassava residue (CR) is mechanically crushed and passed through a 50-mesh sieve. Weigh 100 parts of sieved cassava residue and 80 parts of sodium hydroxide into a beaker, then measure 2000 parts of ionized water into the beaker, stir and react in a constant temperature water bath at 80°C for 2 hours, after the reaction is completed, take out the reaction solution and centrifuge and wash until neutral The above-mentioned cassava residue and 25 parts of sodium hydroxide, 20 parts of sodium bicarbonate are poured into the large beaker together, adding 1000 parts of deionized water, and then 75 parts of glacial acetic acid. Mechanically stir and react at 80°C for 6 hours, take out the centrifuge and wash the paint until it is neutrally dry, and then pulverize to obtain the treated cassava residue.

[0045] (2) Preparation of modified bentonite: Weigh 1 part of bentonite and 50 parts of ethyl acetate into a beaker, stir ultrasonically fo...

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Abstract

The invention discloses a preparation method of cassava residue / polyvinyl alcohol semi-penetrating network super absorbent microspheres. The manioc waste / polyvinyl alcohol semi-penetrating network super absorbent microsphere material is prepared by taking manioc waste and polyvinyl alcohol as raw materials, modified bentonite as an additive, acrylic acid and acrylamide as grafting monomers, tetramethylethylenediamine as a cross-linking agent and potassium persulfate as an initiator through an inverse emulsion method. The maximum deionized water absorption rate of the water absorption microspheres reaches 320 g / g, the water absorption rate can reach 80 g / g within 10 s, and the water absorption rate reaches saturation within 50 s; and the salt absorption rate reaches 65 g / g, water absorption saturation is achieved within 1 min, in addition, the absorption rate of artificial urine reaches 28 g / g, and the absorption rate of artificial blood reaches 42 g / g. The method is easy to operate, the process is controllable, raw materials are low in cost and easy to degrade, and the prepared microspheres are high in liquid absorption rate and good in salt tolerance and have wide application prospects in the fields of hygienic products for children and adults, agricultural water retention materials and the like.

Description

technical field [0001] The present invention relates to the technical field of superabsorbent resin preparation, in particular to a method of using waste cassava residue as raw material and polyvinyl alcohol to prepare cassava residue / polyvinyl alcohol semi-penetrating network superabsorbent microspheres by means of inverse emulsion polymerization method. Background technique [0002] Superabsorbent resins (SAPs) are three-dimensional network structures of cross-linked hydrophilic polymers that can absorb large amounts of water without losing their structure, and their high water absorption properties make them ideal for applications in many fields, such as pharmaceutical ( drug delivery systems), agriculture (controlled release of water, fertilizers and pesticides), water treatment and healthcare (J.Polym.Res, 2014,21(2):344–358). However, the raw materials of SAPs for commercial applications are mainly derived from petroleum, and most SAP applications are disposable and p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/02C08F251/00C08F261/04C08F220/06C08F220/56C08F2/32C08F2/44C08K9/06C08K3/34
CPCC08F251/02C08F251/00C08F261/04C08F2/32C08F2/44C08K9/06C08K3/346C08F220/06C08F220/56
Inventor 秦祖赠马力谢新玲苏通明罗轩
Owner GUANGXI UNIV
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