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Preparation method of compound water retention gel based on starch-grafted acrylic acid, sodium alginate and slag

A technology of grafting sodium alginate and starch, which is applied in the field of water-retaining materials, can solve the problems of low reuse rate and the water-retention function needs to be strengthened, and achieve the effects of improving mechanical strength, strong regeneration ability and large output.

Inactive Publication Date: 2017-07-14
ANQING NORMAL UNIV
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Problems solved by technology

[0004] Xiao Di chose sodium alginate as the organic matrix and slag as the inorganic porous filler in the article "Study on the Water-retaining and Fertilizer-retaining Properties of Sodium Alginate / Slag Composite Materials". Good water and fertilizer retention, but the water retention function needs to be strengthened, and the reuse rate is low

Method used

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Embodiment Construction

[0017] A preparation method based on starch-grafted acrylic acid, sodium alginate, and slag composite water-retaining gel, comprising the following steps:

[0018] (1) Clean and dry 8 parts by weight of slag, soak in 7 parts by weight of N,N′-methylenebisacrylamide solution for 24 hours, filter, and use the filtrate for later use, take the filter residue and crush it through a 200-mesh sieve Adding 10 parts by weight of sodium alginate solution and 8 parts by weight of calcium chloride solution into the mixed solution, stirring at room temperature for 1-2 hours to prepare a dispersion liquid for use;

[0019] (2) Put 17 parts by weight of starch, 3 parts by weight of sodium hydroxide solution, 0.7 parts by weight of peracetic acid solution and 110 parts by weight of water into the container and react at 50°C for 3 hours, stir and heat to 70°C, and keep this temperature for 40 minutes, after obtaining the gelatinized oxidized starch, cool the obtained gelatinized oxidized starc...

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Abstract

The invention discloses a preparation method of compound water retention gel based on starch-grafted acrylic acid, sodium alginate and slag, which comprises the following steps: mixing sodium alginate as an organic matrix and slag as an inorganic porous filler to obtain a dispersion solution, oxidizing starch, grafting sodium hydroxide neutralized acrylic acid, mixing, and crosslinking sodium alginate and oxidized starch with acrylic acid and N,N'-methylenebis(acrylamide) as crosslinkers. The addition of calcium ions enhances the double effect of complexation between sodium alginate and oxidized starch, so that the three-dimensional grid of the prepared water retention gel has different sizes, which is in favor of improving the mechanical strength and water retention property of the water retention agent.

Description

technical field [0001] The invention relates to the technical field of water-retaining materials, in particular to a method for preparing a water-retaining gel based on the composite of starch-grafted acrylic acid, sodium alginate and slag. Background technique [0002] Water-retaining material is a new type of functional polymer material, which can absorb water tens to thousands of times its own weight in a short period of time, and the gel formed after absorbing water and swelling is not easy to separate out water under pressure. When the relative humidity of the environment decreases, it can slowly release water. So far, the new water-absorbing and water-retaining materials that people have researched can be roughly divided into three categories: inorganic water-retaining materials, organic water-retaining materials and organic / inorganic composite water-retaining materials, inorganic water-retaining materials It mainly refers to that some natural non-metallic minerals use...

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Application Information

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IPC IPC(8): C08F251/00C08F220/06C08F222/38C08K9/04C08K3/00C08B31/18
CPCC08F251/00C08B31/18C08K3/00C08K9/04C08F220/06C08F222/385
Inventor 占生宝张杰闻军吴文进王鹏李伶俐江善和
Owner ANQING NORMAL UNIV
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