Method for preparing high-hydroscopicity resin in homogeneous aqueous medium by using straw as raw material

A technology of superabsorbent resin and water medium, which is applied in the fields of fiber raw material processing, textiles and papermaking, etc., to achieve the effects of uniform distribution of product components, cost reduction, and wide application prospects

Inactive Publication Date: 2009-09-02
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0009] At present, straw biomass is used as raw material to obtain cellulose with suitable molecular weight through separation and purification, and its solvent is dissolved in alkaline urea aqueous solution to obtain a homogeneous cellulose aqueous solution, and propylene-based monomer is added to initiate homogeneous grafting. The research on polymer superabsorbent resin obtained by polymerization has not been reported yet, and it is still a blank

Method used

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  • Method for preparing high-hydroscopicity resin in homogeneous aqueous medium by using straw as raw material
  • Method for preparing high-hydroscopicity resin in homogeneous aqueous medium by using straw as raw material
  • Method for preparing high-hydroscopicity resin in homogeneous aqueous medium by using straw as raw material

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Embodiment 1

[0028] figure 1 The schematic flow chart of the present invention for separating cellulose from straw, preparing cellulose aqueous solution and preparing superabsorbent resin is given: the whole process is divided into four steps: first, carry out acid pretreatment on the raw material straw biomass A to remove half Cellulose, obtained by filtration and separation of hemicellulose degraded sugar solution C and residue B; followed by delignification of residue B to obtain pure cellulose D; and then using alkaline water solvent to dissolve the obtained cellulose to obtain fiber cellulose aqueous solution E; finally, with the cellulose aqueous solution as the main body, propylene-based monomers are added to carry out graft polymerization initiated by free radicals to obtain superabsorbent resin F. These four steps are interrelated, that is: the removal rate of hemicellulose in the first step should be greater than 80%, so as to ensure the smooth progress of the second step of deli...

Embodiment 2

[0037] With a molecular weight of 4.6×10 4 g / mol straw isolated cellulose as raw material. Take 0.2 grams of cellulose, 0.3 grams of sodium hydroxide, and 0.2 grams of urea, dissolve them at low temperature and prepare 5 grams of a solution, then introduce 0.2 grams of acrylamide, react at 55 ° C for 2 hours, and then 2 Add 0.004 g of K under atmosphere 2 S 2 o 8 , then raised the temperature to 60°C to initiate the grafting reaction for 15 minutes, cooled, neutralized to neutral with hydrochloric acid, added 0.66 grams of sodium acrylate, 0.3 grams of acrylamide, 0.004 grams of N, N'-methylenebisacrylamide, 0.008 Gram K 2 S 2 o 8 , then at N 2 Under atmosphere protection, react at 60°C for 1.5h, take out the block-shaped transparent gel, soak it in ethanol for 2 days, dehydrate, and dry at 80°C to obtain superabsorbent resin D.

Embodiment 3

[0039] With a molecular weight of 6.2×10 4 g / mol straw isolated cellulose as raw material. Take 0.2 g of cellulose and 0.3 g of sodium hydroxide, freeze at low temperature and melt at room temperature to obtain an aqueous solution of cellulose, add 0.2 g of acrylamide, react at 55 ° C for 2.5 h, cool, neutralize with hydrochloric acid until neutral, add Acrylamide 0.6 g, N,N'-methylenebisacrylamide 0.0045 g, K 0.009 g 2 S 2 o 8 , at N 2 Under the protection of atmosphere, react at 60°C for 2 hours, take out the block transparent gel, soak it in ethanol for 2 days, dehydrate, and dry at 80°C to obtain superabsorbent resin E.

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Abstract

The invention relates to a method for preparing high-hydroscopicity resin in uniform-phase aqueous medium by using straw as a raw material. The method comprises the following steps: adopting a double-phase saline aqueous solution system of inorganic acid and polyethylene glycol to sequentially process the straw to obtain cellulose; then, adding the cellulose to a pre-prepared sodium hydroxide-urea aqueous solution or a lithium hydroxide-urea aqueous solution; putting the solution in a refrigerator to be cooled, taking out the solution for mechanically stirring to obtain a uniform cellulose solution; afterwards, adding propenyl monomer to the obtained cellulose aqueous solution and carrying out homogeneous glycerol polymerization to obtain the high-hydroscopicity resin. The hydroscopicity resin has the advantages of low cost, high hydroscopicity and potential biodegradable characteristic and has wide application space in the fields, such as agriculture, forestry, sanitary health products, building materials, perfume emission, and the like.

Description

technical field [0001] The invention relates to a new method for separating cellulose from straw, preparing cellulose homogeneous aqueous solution, and using the aqueous solution to carry out graft copolymerization of propylene-based monomers to prepare superabsorbent resin. Background technique [0002] Superabsorbent resin refers to a polymer cross-linked hydrogel that can absorb hundreds or even thousands of times its own mass of water, due to its fast water absorption rate, high water retention performance and slow water control release ability It is widely used in sanitary materials, controlled release of perfume, construction and other fields, and has great application prospects in fields such as agriculture, forestry and water conservation, desert control, and controlled release of drugs. The research on superabsorbent resin has a history of about 50 years, and a variety of products have been marketed. [0003] From the perspective of chemical composition, the curren...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/02D21C5/00
Inventor 闫立峰陈武峰顾青
Owner UNIV OF SCI & TECH OF CHINA
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