Preparation method of bagasse pith nanometer cellulose-based composite water-retaining agent

A nanocellulose and water-retaining agent technology, applied in chemical instruments and methods, fertilizer mixtures, applications, etc., can solve the problems of increased number of agricultural operations and costs, general water absorption capacity, etc., and achieve good biodegradability, low price, good effect of tolerance

Inactive Publication Date: 2014-08-27
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the salt-tolerant soil water-retaining agents used today are non-ionic acrylamide or hydroxyl-containing polymers, but these polymers have a general water absorption capacity; for ionic high water-absorbing water retention, it is necessary to avoid salt dehydration , usually in the process of its use, it is necessary to avoid the fertilization period, which invisibly increases the number of agricultural operations and costs

Method used

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  • Preparation method of bagasse pith nanometer cellulose-based composite water-retaining agent

Examples

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Comparison scheme
Effect test

Embodiment １

[0033] Example 1: The preparation method of the cane pith nanocellulose-based composite water-retaining agent suitable for acidic soil is as follows:

[0034] (1) The preparation process of cane pith

[0035] The bagasse is air-dried to control the moisture content to be 7%, and then the air-dried material is screened by a sieve of 80-100 meshes to be qualified cane pith raw materials.

[0036] (2) Extraction of cellulose from cane pith parenchyma cells

[0037] Use hydrogen peroxide and glacial acetic acid mixture to extract cellulose from qualified cane pith raw materials, wherein the mass percentage concentration is 30% hydrogen peroxide and glacial acetic acid are mixed in a volume ratio of 1:3 to obtain hydrogen peroxide and ice Acetic acid mixture, the mass percentage concentration of cane pith raw material in the mixture is 8%, and then treated at 60 ° C for 48 hours. After the reaction is completed, the material is deionized and washed to neutrality and air-dried to...

Embodiment 2

[0054] Example 2: The preparation method of the cane pith nanocellulose-based composite water-retaining agent suitable for acidic soil is as follows:

[0055] (1) The preparation process of cane pith

[0056] The bagasse is air-dried to control the moisture content to be 10%, and then the air-dried material is screened by a 150-250 mesh sieve to obtain qualified cane pith raw materials.

[0057] (2) Extraction of cellulose from cane pith parenchyma cells

[0058] Use hydrogen peroxide and glacial acetic acid mixture to extract cellulose from qualified cane pith raw materials, wherein the mass percentage concentration is 32% hydrogen peroxide and glacial acetic acid are mixed in a volume ratio of 1:1 to obtain hydrogen peroxide and ice Acetic acid mixed solution, the mass percentage concentration of cane pith raw material in the mixed solution is 10%, and then treated at 80 ° C for 36 hours. After the reaction is completed, the material is deionized and washed to neutrality ...

Embodiment 3

[0075] Example 3: The preparation method of the cane pith nanocellulose-based composite water-retaining agent suitable for acid soil, the specific operations are as follows:

[0076] (1) The preparation process of cane pith

[0077] The bagasse is air-dried to control the moisture content to be 20%, and then the air-dried material is screened by a 300-350 mesh sieve to be a qualified cane pith raw material.

[0078] (2) Extraction of cellulose from cane pith parenchyma cells

[0079] Use hydrogen peroxide and glacial acetic acid mixture to extract cellulose from qualified cane pith raw materials, wherein the mass percentage concentration of 35% hydrogen peroxide and glacial acetic acid is mixed in a volume ratio of 3:1 to obtain hydrogen peroxide and ice Acetic acid mixture, the mass percentage concentration of cane pith raw material in the mixture is 15%, and then treated at 100 ° C for 12 hours. After the reaction is completed, the material is deionized and washed to neut...

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Abstract

The invention discloses a preparation method of a bagasse pith nanometer cellulose-based composite water-retaining agent, which comprises the following steps: air-drying and screening sugar-squeezed bagasse to obtain bagasse pith raw materials, performing cellulose extraction and high-strength ultrasonic dissociation of the bagasse pith raw materials, performing etherification modification of nanometer cellulose under an alkaline condition to obtain cationic cellulose ether, performing grafting copolymerization/crosslinking reaction of the cationic cellulose ether by an aqueous solution polymerization method, and after the reaction, continuing to adding nanometer cellulose for compounding so as to obtain the bagasse pith nanometer cellulose-based composite water-retaining agent. The water-retaining agent prepared by the method has excellent liquid imbibition value for deionized water, 0.1 mol/l KCl, 0.1 mol/l NH4Cl and 0.1 mol/l KH2PO4 at pH of 5.5-6.5, which shows that the water-retaining agent has good liquid imbibition performance and salt resistance in weak-acid aqueous environment, and can be used in fields of acid soil desertification control, agricultural and forestal crop plantation, landscaping, and the like.

Description

technical field [0001] The invention relates to a process technology for preparing a highly water-absorbing material with weak acid resistance and strong salt resistance by using sugarcane pith parenchyma cell nanocellulose and its cationic cellulose graft copolymer, and belongs to the technical field of composite polymer materials. Background technique [0002] Water retaining agent, also known as superabsorbent resin, humectant, hydrogel, is a micro-crosslinked high molecular compound. This kind of material can absorb hundreds to thousands of times of its own weight in pure water when it encounters external water, so as to achieve the function of water storage, and at the same time, it can slowly release water for soil and plants to use. [1] . Usually, as long as the molecular chain is not damaged during the use process, the water retaining agent has the function of repeatedly absorbing water, that is, absorbing water - releasing water - drying - absorbing water again. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/32C08F251/02C08J3/24
Inventor 高欣张恒陈克利
Owner KUNMING UNIV OF SCI & TECH
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