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Carbon-based water absorbent and preparation method thereof

A water-absorbing agent, carbon-based technology, applied in the field of carbon-based water-absorbing agent and its preparation, can solve the problems of low repeated absorption capacity, high manufacturing cost, poor salt resistance, etc., to relieve the pressure of treatment, alleviate environmental pollution problems, price cheap effect

Active Publication Date: 2014-02-26
INNER MONGOLIA UNIV FOR THE NATITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the related art, the water-absorbing agent is formed by polymers of acrylic acid or acrylate, and the product has better water-absorbing performance, but in production and application, there are many problems, such as: low strength, low repeated absorption capacity, and poor salt resistance , high manufacturing cost, etc.

Method used

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  • Carbon-based water absorbent and preparation method thereof
  • Carbon-based water absorbent and preparation method thereof
  • Carbon-based water absorbent and preparation method thereof

Examples

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preparation example Construction

[0032] The preparation method of the carbon-based water-absorbing agent provided in the embodiment of the present invention is specifically operated according to the following steps:

[0033] a. Pass the biochar and bentonite through a 200-mesh sieve, then add distilled water and mix them evenly. Under the condition of 250w, ultrasonically treat them for 40-50 minutes to fully disperse the biochar and bentonite in distilled water to obtain a mixed suspension of biochar and bentonite. The turbid liquid is used as the filler for preparing the carbon-based water-absorbing agent.

[0034] b. Add alkaline solution to the acrylic acid solution and stir to obtain an acrylic acid solution with a neutralization degree of 70-80%. Because acrylic acid is easy to undergo polymerization, in the embodiment of the present invention, in order to prevent acrylic acid from polymerizing, acrylic acid is neutralized in an ice-water bath; wherein, the concentration of acrylic acid solution is 1.04...

Embodiment 1

[0038] The corn stalks were pulverized and put into a crucible, and the crucible was covered and put into a muffle furnace, and carbonized at 300° C. for 0.5 h to obtain biochar.

[0039] Mix 0.86g of biochar and 0.86g of bentonite that have passed through a 200-mesh sieve, add them into 30ml of distilled water, stir evenly, and ultrasonically treat them for 40 minutes under the condition of 250w, so that the biochar and bentonite are fully dispersed in the distilled water to obtain biochar and bentonite mixed suspension.

[0040] Take 5ml of acrylic acid solution with a concentration of 1.049g / ml in a beaker, place the beaker in an ice-water bath, and add 5ml of a sodium hydroxide solution with a mass concentration of 25%.

[0041] Under normal temperature conditions, add 5ml of acrylamide solution with a mass concentration of 30% and 1ml of N,N-methylenebisacrylamide solution with a concentration of 1g / L to the above-mentioned neutralized acrylic acid solution, and mix well;...

Embodiment 2

[0044] The sawdust was pulverized and put into a crucible, and the crucible was covered and put into a muffle furnace, and carbonized at 400°C for 2 hours to obtain biochar.

[0045] Mix 0.86g of biochar and 1.72g of bentonite that have passed through a 200-mesh sieve, add them into 50ml of distilled water, stir evenly, and perform ultrasonic treatment for 50min under the condition of 250w, so that the biochar and bentonite are fully dispersed in the distilled water to obtain biochar and bentonite mixed suspension.

[0046] Take 5ml of acrylic acid solution with a concentration of 1.051g / ml in a beaker, place the beaker in an ice-water bath, and add 5ml of a sodium hydroxide solution with a mass concentration of 25%.

[0047] Under normal temperature conditions, add 6ml of acrylamide solution with a mass concentration of 30% and 1.5ml of N,N-methylenebisacrylamide solution with a concentration of 1g / L to the above-mentioned neutralized acrylic acid solution, and mix well; Add...

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Abstract

The invention relates to the fields of waste utilization and water absorbents and in particular relates to a carbon-based water absorbent and a preparation method thereof. The carbon-based water absorbent is prepared from the following raw materials in parts by weight: 5.245-5.255 parts of partially neutralized acrylic acid, 1.5-2.0 parts of acrylamide, 1.72-2.58 parts of filler, 0.1-0.22 part of initiator and 0.001-0.0015 part of cross-linking agent, wherein the neutralization of the partially neutralized acrylic acid is 70-80 percent; the filler comprises charcoal and bentonite; a weight ratio of the charcoal to the bentonite is 1: (1-2). According to the carbon-based water absorbent and the preparation method thereof provided by the invention, the water absorbent has high water absorbent rate and is prevented from being mildewed and decomposed; after the water absorbent is buried in the ground, the soil fertility can be improved through the mineral trace elements contained in the water absorbent, and the soil structure is improved. Therefore, the water absorbent has the effects of relieving pressure of biomass raw material treatment and environmental pollution.

Description

technical field [0001] The invention relates to the field of waste utilization and water-absorbing agents, in particular to a carbon-based water-absorbing agent and a preparation method thereof. The carbon-based water-absorbing agent of the present invention is mainly used in soil, and aims to improve the water-holding capacity of the soil and play the role of carbon sequestration and fertilization, and can also be applied to other water-absorbing agent industries. Background technique [0002] In my country, water resources are related to all walks of life, and the lack of water resources seriously affects the development of my country's national economy and people's livelihood. Arid and semi-arid areas account for about 51% of the country's land area, and soil erosion is serious, and soil water retention capacity continues to decline. Coupled with uneven temporal and spatial distribution of precipitation, soil reservoirs cannot cope with dry seasons, resulting in a large n...

Claims

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Application Information

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IPC IPC(8): C08F220/06C08F220/56C08F222/38C08F2/44C08K9/00C08K3/04C08K3/34C09K17/40
Inventor 郑庆福佘集凯姜海霞田立双牛鹤鹤孙月光周佳儒
Owner INNER MONGOLIA UNIV FOR THE NATITIES
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