Preparation method of cellulose-based high-water-absorption high-water-retention resin

A water-retaining resin and cellulose technology, which is used in fiber raw material processing, textile and papermaking, bulk chemical production, etc. The effect of reducing the cost of synthesis

Active Publication Date: 2011-08-17
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the problems of high cost, refractory degradation and / or low water absorption rate of existing water-absorbent resins, the purpose of the present invention is to provide a preparation method of cellulose-based superabsorbent and water-retaining resins, using hemp spinning waste as raw material, homogeneously polymerized Preparation of superabsorbent and water-retaining resin

Method used

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  • Preparation method of cellulose-based high-water-absorption high-water-retention resin
  • Preparation method of cellulose-based high-water-absorption high-water-retention resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: (below all mass percent meter)

[0022] (1) Cellulose extraction: crush flax waste yarn, place it in 1% NaOH solution at a bath ratio of 1:20 (m / v), boil at 100 °C for 1 h, wash with hot water until neutral, and place in In 1.5% NaOH / 0.4% sodium polyphosphate / 0.4% sodium silicate mixed solution, boil at 100 ℃ for 2 h, wash with hot water until neutral, and dry. income α -97% cellulose, it is pulverized, passed through a 40 mesh sieve, and set aside.

[0023] (2) Cellulose dissolution: Take 1 g of crushed flax cellulose and immerse in 25 mL of pre-cooled 6% sodium hydroxide / 12% urea aqueous solution at -20 °C, freeze at -20 °C for 60 min, and mechanically stir at room temperature for 5 min , to obtain a homogeneous and transparent cellulose solution.

[0024] (3) Homogeneous polymerization: Stir the transparent cellulose solution obtained in (2) under nitrogen protection for 30 minutes, and heat it to 70 °C, add 0.1 g of initiator ammonium persulfate (A...

Embodiment 2

[0026] (1) Cellulose extraction: crush flax waste yarn, place it in 1% NaOH solution at a bath ratio of 1:20 (m / v), boil at 100 °C for 1 h, wash with hot water until neutral, and place in In 1.5% NaOH / 0.4% sodium polyphosphate / 0.4% sodium silicate mixed solution, boil at 100 ℃ for 2 h, wash with hot water until neutral, and dry. income α -97% cellulose, it is pulverized, passed through a 40 mesh sieve, and set aside.

[0027] (2) Cellulose dissolution: immerse 1 g of crushed flax cellulose in 25 mL of 7% sodium hydroxide / 10% urea aqueous solution pre-cooled at -20 °C, freeze at -20 °C for 60 min, and mechanically stir at room temperature for 5 min , to obtain a homogeneous and transparent cellulose solution.

[0028] (3) Homogeneous polymerization: Stir the transparent cellulose solution obtained in (2) under nitrogen protection for 30 min, and heat to 70 °C, add 0.1 g of initiator APS, and add 5 g of AA after 15 min (neutralization degree 70%), 1 g AM monomer and 0.03 g cr...

Embodiment 3

[0030] (1) Cellulose extraction: crush flax waste yarn, place it in 1% NaOH solution at a bath ratio of 1:20 (m / v), boil at 100 °C for 1 h, wash with hot water until neutral, and place in In 1.5% NaOH / 0.4% sodium polyphosphate / 0.4% sodium silicate mixed solution, boil at 100 ℃ for 2 h, wash with hot water until neutral, and dry. income α -97% cellulose, it is pulverized, passed through a 40 mesh sieve, and set aside.

[0031] (2) Cellulose dissolution: Take 1 g of crushed flax cellulose and immerse in 25 mL of pre-cooled 10% sodium hydroxide / 4% urea aqueous solution at -20 °C, freeze at -20 °C for 60 min, and mechanically stir at room temperature for 5 min , to obtain a homogeneous and transparent cellulose solution.

[0032] (3) Homogeneous polymerization: Stir the transparent cellulose solution obtained in (2) under nitrogen protection for 30 min, and heat to 60 °C, add 0.1 g initiator APS, and add 4 g AA after 15 min (neutralization degree 70%) and 1 g AM monomer and 0.0...

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Abstract

The invention discloses a preparation method of a cellulose-based high-water-absorption high-water-retention resin. The preparation method comprises the following steps: by using bast fiber textile waste as a raw material, separating and dissolving by soda boiling, and carrying out graft copolymerization with propenyl monomers to obtain the high-water-absorption high-water-retention resin. The invention implements homogeneous polymerization of cellulose and propenyl monomers, and solves the problems of microscopic phase separation, low graft ratio and uniform composition distribution in the existing heterogeneous polymerization. The used cellulose is from waste in the bast fiber textile process, thereby reasonably utilizing bast fiber textile waste resources, lowering the resin synthesis cost and having important social and economic benefits; and compared with the existing cellulose solvent system comprising ammoniacal copper solution, 4-methylmorpholine-N-oxide, ionic liquid and the like, the solvent system adopted by the method disclosed by the invention has the advantages of environmental protection and lower cost. By using the bast fiber textile waste as the raw material, the cellulose-based high-water-absorption high-water-retention resin prepared by the method disclosed by the invention has the advantages of low preparation cost, high water absorptivity and high salt resistance, is biodegradable, and is applicable to drought control, water retention, desertification control and the like in agriculture and forestry.

Description

technical field [0001] The invention relates to a preparation method of a superabsorbent and water-retaining resin, in particular to a preparation method of a cellulose-based superabsorbent and water-retaining resin. Background technique [0002] Super absorbent and water-retaining resin is a new type of functional polymer material that has been developed rapidly in recent decades. It can absorb water dozens or even thousands of times its own mass, and it can also retain water under pressure or heat. Slowly control the release of absorbed water, so it has broad application prospects in the fields of agricultural and forestry soil improvement and water and fertilizer conservation, seedling protection, hydrogel substrates, physiological and hygienic products, medicine and medical treatment, oil-water separation, and daily cosmetics. [0003] At present, the existing superabsorbent and water-retaining resins are roughly divided into three series according to their different pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/02D21C5/00C08J3/09
CPCY02P20/54
Inventor 姚菊明吴芳刘琳
Owner ZHEJIANG SCI-TECH UNIV
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