A kind of hydrogel for soil improvement and its preparation method and application

A soil improvement and hydrogel technology, applied in the fields of application, soil conditioning materials, chemical instruments and methods, etc., can solve the problems of no obvious advantages and complicated preparation process, saving energy consumption and chemical reagent costs, and large-scale application. Foreground effect

Active Publication Date: 2021-01-19
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] As a sugar polymer, the hemicellulose molecular chain has a structure similar to that of starch, and many works have proved that hemicellulose can be used as a raw material to prepare superabsorbent materials (Gabrielii, Journal of Applied PolymerScience, 1998; X.W.Peng, Journal of Agricultural and Food Chemistry, 2011), but the vast majority of hemicellulose raw materials are limited to isolated and purified hemicellulose products, and the preparation process is relatively complicated, which has no obvious economic advantages compared with traditional gels

Method used

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  • A kind of hydrogel for soil improvement and its preparation method and application
  • A kind of hydrogel for soil improvement and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Take 0.5 parts by weight of the concentrated prehydrolyzate of the pulp mill as a solvent, the content of soluble hemicellulose in the solvent is 4%, add 0.5 parts by weight of water to the solvent to dilute it twice, add 0.05 parts by weight of acrylic acid, and use KOH The neutralization ratio of acrylic acid was adjusted to 70%, and 0.001 part of N,N dimethylbisacrylamide was added, mixed in the reactor, and heated to 70°C. At the same time, after adding 0.001 parts by weight of ammonium persulfate and 0.001 parts by weight of dimethylethylenediamine, sealed and reacted for 2 hours to obtain a dark red hydrogel product, each gram of the product can absorb 30 grams of deionized water or 21 grams of tap water.

[0043] The hydrogel product is mixed with the fermented liquid of nitrogen-fixing bacteria rotunda at a weight ratio of 1:100, and then mixed with high-speed stirring equipment and then mixed with sterilized peat to obtain a water-containing solid microbial prod...

Embodiment 2

[0046] Heat 0.5 parts by weight of the alkaline hemicellulose mucus recovered from alkali squeezed in a viscose fiber factory to above 80° C. to dissolve it, add water to dilute it twice, and adjust the hemicellulose concentration to 4%. Add 0.05 parts by weight of acrylamide and 0.001 parts of N,N dimethylbisacrylamide and mix them in the reactor, add 0.001 parts by weight of ammonium persulfate and 0.001 parts by weight of dimethylethylenediamine, and seal at 70°C After reacting for 2 hours, a deep red alkaline hydrogel product was obtained. Each gram of product can absorb 45 grams of deionized water or 32 grams of tap water.

[0047] The resulting hydrogel product is mixed with decomposed sheep manure (pH alkaline) according to the method of the above-mentioned embodiment 1 to adjust the acid compacted soil, and the mixed material is added to the acid compacted soil (see figure 2 ).

[0048] In laboratory tests, when the addition amount was 1.5%, it could effectively red...

Embodiment 3

[0050] Dilute 0.5 parts by weight of the alkaline hemicellulose mucus recovered from alkali squeezed alkali in the viscose fiber factory with water, adjust the hemicellulose concentration to 4%, adjust the pH value to 2.5 with concentrated phosphoric acid, and the mucus becomes milk Yellow suspension, after reacting in a sealed reactor at 150°C for 30 minutes, a red hemicellulose solution was obtained. Using this solution as a solvent, the same method as in Example 1 was used to prepare a hydrogel product, and each gram of the product could absorb 40 grams of deionized water or 28 grams of tap water. The hydrogel product and Bacillus coagulans fermentation broth are mixed at high speed according to the weight ratio of 1:50 to obtain a viscous liquid bacterial agent product, which can be used to improve saline-alkali soil, and the addition of hydrogel can improve the growth and metabolism of microorganisms It provides a slightly acidic humid environment, which is more conducive...

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Abstract

The invention belongs to the field of high value conversion and utilization of biological waste, in particular to a soil improving hydrogel, a preparation method thereof and application thereof. The hemicellulose-containing wastewater is used as a solvent, mixed with a hydrogel monomer and a crosslinking agent, and a crosslinked polymer obtained by polymerization is a hydrogel. The water-retainingagent provided by the invention can directly use the hemicellulose-containing wastewater as the solvent, thereby eliminating the high energy consumption and chemical reagent costs of separation and purification of hemicellulose; oligosaccharide rich therein and phosphorus and potassium and other elements added during the preparation process can be used as a supplementary nutrient for crops and soil microorganisms to promote the water retention performance of a soil ecological improving agent and microbial colonization. The other components in by-products are utilized, and no wastewater is discharged during the entire utilization process, thereby providing an economical and environment-friendly route for hemicellulose treatment in the pulping and viscose fiber industries.

Description

technical field [0001] The invention belongs to the field of high-value conversion and utilization of biological waste, and specifically relates to a hydrogel for soil improvement, a preparation method and application thereof. Background technique [0002] Under the current pressure of resources and environment, more and more attention has been paid to the research on the transformation of materials and energy using bio-renewable raw materials. Hemicellulose is one of the most abundant renewable resources in the world as the second only to cellulose in plant resources. However, due to the complexity and diversity of the composition and structure of hemicellulose, it has not been fully applied. In particular, the treatment and application of a large number of hemicellulose by-products produced in the pulping and viscose fiber industries has always been a hot spot in the relevant industries. Most of these hemicellulose-containing by-products have low fuel value and high wate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/075C08F251/00C08F220/06C08F222/38C08F220/56C09K17/32
CPCC08F251/00C08J3/075C08J2305/14C08J2351/02C09K17/32C08F220/06C08F222/385C08F220/56
Inventor 张跃冬李滨张涛刘超于光
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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