Method for preparing grafted bagasse xylan copolymer
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The technology of xylan and copolymer is applied in the field of preparation of grafted bagasse xylan copolymer, and achieves the effects of good thermal stability and surface activity, high utilization rate of raw materials and easy control of reaction conditions
Inactive Publication Date: 2012-01-18
GUILIN UNIVERSITY OF TECHNOLOGY
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[0005] At present, most foreign studies on the esterification modification of xylan use birch, beech, corn cob and other sources of xylan as raw materials. There are few reports on the modification and synthesis of graft copolymers
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Embodiment 1
[0025] 1. Take 10g of bagasse xylan and 30mL of solvent into the reactor for stirring, use 0.5mol / L hydrochloric acid to control the pH of the system to 8, and stir at room temperature for 0.5 hours;
[0026] 2. Add 0.5g of initiator potassium persulfate, then add 0.3g of composite crosslinking agent N,N-methylenebisacrylamide / divinylbenzene, dissolve 5g of acrylamide in 20mL of distilled water for later use;
[0027] 3. Put the above-mentioned acrylamide solution and 10.0mL butyl acrylate solution in a constant pressure dropping funnel, add dropwise to the reaction system, and react at 50°C for 8 hours;
[0028] 4. Suction filtration while hot to obtain primary crude product; the crude product was repeatedly washed 3 times with 90% ethanol water solution by volume, then placed in a vacuum drying oven, dried for 12 hours at 60°C, and then allowed to dry naturally in the furnace Cooling to get thick graft copolymer;
[0029] 5. Extract the crude graft copolymer with analytical...
Embodiment 2
[0031] 1. Take 12g of bagasse xylan and 50mL of solvent into the reactor for stirring, use 0.5mol / L hydrochloric acid to control the pH of the system to 9, and stir at room temperature for 0.5 hours;
[0032] 2. Add 0.6g of initiator potassium persulfate, then add 0.36g of composite crosslinking agent N,N-, methylenebisacrylamide / divinylbenzene, dissolve 6g of acrylamide in 20mL of distilled water for later use;
[0033] 3. Put the above-mentioned acrylamide solution and 24.0mL butyl acrylate solution in a constant pressure dropping funnel, add dropwise to the reaction system, and react at 70°C for 10 hours;
[0034] 4. Suction filtration while hot to obtain primary crude product; the crude product was repeatedly washed twice with 90% ethanol aqueous solution, placed in a vacuum drying oven, dried at 60°C for 12 hours, and then allowed to dry naturally in the furnace Cooling to get thick graft copolymer;
[0035] 5. Extract the crude graft copolymer with analytically pure ace...
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Abstract
The invention discloses a method for preparing a grafted bagasse xylan copolymer. Bagasse xylan, acrylamide and butyl acrylate are fed according to a xylose unit, acrylamide and butyl acrylate molar ratio equaling to 1 : (0.5-2) : (0.5- 2.0), and the method comprises the following steps of: firstly adding the bagasse xylan and a solvent into a reaction kettle for uniformly mixing, controlling a pH value of a reaction at 6-9, and reacting for 0.5-1 hour at a room temperature; adding an initiating agent and a composite cross-linking agent, then adding the acrylamide dissolved by using the solvent and mixing with the butyl acrylate to obtain a mixture, adding the mixture in the reaction system and reacting for 6-10 hours at 40-70 DEG C; regulating the pH value of the reaction system to be neutral, and performing suction filtering while the reaction system is hot; repeatedly washing a product by using a 80-95 percent ethanol water solution for 2-3 times, placing in a vacuum drying oven, and drying for 12 hours at 60 DEG C and then naturally cooling along with the oven to obtain a crude copolymer; and extracting the crude copolymer to obtain a pure grafted copolymer by using an Saxhlet extractor. The invention has the advantages of simple process flow, easiness for controlling reaction condition, high raw material utilization ratio, low energy consumption, high attached value and wide application range.
Description
technical field [0001] The invention relates to a preparation method of grafted bagasse xylan copolymer. Background technique [0002] With the rapid development of industry and science and technology, new green and environmentally friendly materials have attracted more and more attention from the society, and the research and development of deep processing of agricultural and forestry waste has received increasing attention. China is the third largest sugarcane planting country after Brazil and India. The total output of sugarcane in the southern sugarcane region is about 70 million tons, and the output of bagasse reaches about 10 million tons. Bagasse is a major by-product of the sugar industry and an important renewable biomass resource. At present, only preliminary processing and utilization of bagasse have been carried out in China, and the economic value of most products is not very high. In addition to conventional products such as pulping and papermaking, power gen...
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