Graft copolymer of starch and methacrylic dehydrated glyceride

Abstract

The invention provides a graft copolymer of starch and methacrylic dehydrated glyceride. The main chain of the graft copolymer is the starch; the branched chain of the graft copolymer is the polymethacrylic dehydrated glyceride; part of the epoxy group on the branched chain is aminated into -OCH2CHOHCH2-NH2NH2 or -OCH2CHOHCH2-NH-(C2H4NH)n-C2H4-NH2 and n is equal to 0 to 3; and the graft rate is 20 to 82.1 percent and the nitrogen content is 1 to 20.06 percent. The graft copolymer of the invention can chelate heavy metal ion, and the removing rate of the heavy metal ion reaches over 99 percent when the graft copolymer is used for treating waste water containing the heavy metal ion.

Description

technical field

[0001] The invention relates to the field of polymer materials, in particular to a graft copolymer. Background technique

[0002] With the rapid development of the electronics industry, the pollution of heavy metal wastewater and waste is becoming more and more serious, seriously polluting the living environment of human beings, affecting people's quality of life, and seriously restricting the development of the electronics industry. Therefore, how to solve the problem of electroplating pollution , Treatment of electroplating wastewater has become an urgent task in the field of environmental protection. At present, there are many methods for removing heavy metal ions, such as: ion exchange method, reverse osmosis method, adsorption method, biological treatment method, etc. The most common method is still chemical precipitation. However, the effect of chemical precipitation on electroplating waste liquid is not ideal, and it cannot meet the existing discharg...

Examples

preparation example

[0014] Grafting rate and nitrogen content of following example are all determined by following method:

[0015] Determination of nitrogen content: use the Kjeldahl method to measure the nitrogen content in the sample, and then calculate according to the following formula:

[0016] Nitrogen content% = [(V-V 0 )N / W]×0.014×100

[0017] In the formula: V - the number of milliliters of HCl consumed, mL;

[0018] V 0 - the number of milliliters of HCl consumed by the blank experiment mL;

[0019] Normal concentration of N-HCl

[0020] W-sample weight, g

[0021] Determination method of graft rate: measure graft rate (G, %) by gravimetric method. Wrap the dried crude product with filter paper, place it in a 250ml Soxhlet extractor to extract and remove the homopolymer, wash, filter and vacuum dry to constant weight to obtain pure graft copolymer.

[0022] Calculated as follows:

[0023] G = m G ...

example 1

[0027] Take 5g of cornstarch and 50mL of distilled water and put them into a 250mL three-neck flask, stir to form starch milk and blow in nitrogen gas, add 0.1g of ammonium persulfate and 8.5g of dehydrated glyceryl methacrylate, heat up to 45°C and react for 2 hours to obtain starch grafted formazan Dehydrated glyceryl acrylate copolymer is the backbone of the chelating agent. Take 2g of copolymer (dry basis), add 10mL of diethylenetriamine into a 250mL three-neck flask, stir, condense and reflux at 65°C for 20h to obtain a white gel-like product, precipitate and wash the product with absolute ethanol, and vacuum dry at 50°C. The obtained product was tested, and the grafting ratio (G) was 61.68%, and the nitrogen content was 13.8%.

example 2

[0029] Take 10g of cornstarch and 50mL of distilled water and put them into a 250mL three-neck flask, stir to form starch milk and blow in nitrogen gas, add 0.05g of cerium ammonium nitrate and 6.5g of glycidyl methacrylate, heat up to 35°C and react for 2h to obtain starch grafted formazan Glycidyl acrylate copolymer is the backbone of the chelating agent. Take 2g of copolymer (dry basis), add 15mL of hydrazine hydrate into a 250mL three-necked flask, stir, condense and reflux at 85°C for 8h to obtain a white colloidal product, precipitate and wash the product with absolute ethanol, and vacuum dry at 50°C. The obtained product was tested, and the grafting rate (G) was 31.5%, and the nitrogen content was 2.0%.

technical field

[0001] The invention relates to the field of polymer materials, in particular to a graft copolymer. Background technique

[0002] With the rapid development of the electronics industry, the pollution of heavy metal wastewater and waste is becoming more and more serious, seriously polluting the living environment of human beings, affecting people's quality of life, and seriously restricting the development of the electronics industry. Therefore, how to solve the problem of electroplating pollution , Treatment of electroplating wastewater has become an urgent task in the field of environmental protection. At present, there are many methods for removing heavy metal ions, such as: ion exchange method, reverse osmosis method, adsorption method, biological treatment method, etc. The most common method is still chemical precipitation. However, the effect of chemical precipitation on electroplating waste liquid is not ideal, and it cannot meet the existing discharg...

Examples

preparation example

[0014] Grafting rate and nitrogen content of following example are all determined by following method:

[0015] Determination of nitrogen content: use the Kjeldahl method to measure the nitrogen content in the sample, and then calculate according to the following formula:

[0016] Nitrogen content% = [(V-V 0 )N / W]×0.014×100

[0017] In the formula: V - the number of milliliters of HCl consumed, mL;

[0018] V 0 - the number of milliliters of HCl consumed by the blank experiment mL;

[0019] Normal concentration of N-HCl

[0020] W-sample weight, g

[0021] Determination method of graft rate: measure graft rate (G, %) by gravimetric method. Wrap the dried crude product with filter paper, place it in a 250ml Soxhlet extractor to extract and remove the homopolymer, wash, filter and vacuum dry to constant weight to obtain pure graft copolymer.

[0022] Calculated as follows:

[0023] G = m G ...

example 1

[0027] Take 5g of cornstarch and 50mL of distilled water and put them into a 250mL three-neck flask, stir to form starch milk and blow in nitrogen gas, add 0.1g of ammonium persulfate and 8.5g of dehydrated glyceryl methacrylate, heat up to 45°C and react for 2 hours to obtain starch grafted formazan Dehydrated glyceryl acrylate copolymer is the backbone of the chelating agent. Take 2g of copolymer (dry basis), add 10mL of diethylenetriamine into a 250mL three-neck flask, stir, condense and reflux at 65°C for 20h to obtain a white gel-like product, precipitate and wash the product with absolute ethanol, and vacuum dry at 50°C. The obtained product was tested, and the grafting ratio (G) was 61.68%, and the nitrogen content was 13.8%.

example 2

[0029] Take 10g of cornstarch and 50mL of distilled water and put them into a 250mL three-neck flask, stir to form starch milk and blow in nitrogen gas, add 0.05g of cerium ammonium nitrate and 6.5g of glycidyl methacrylate, heat up to 35°C and react for 2h to obtain starch grafted formazan Glycidyl acrylate copolymer is the backbone of the chelating agent. Take 2g of copolymer (dry basis), add 15mL of hydrazine hydrate into a 250mL three-necked flask, stir, condense and reflux at 85°C for 8h to obtain a white colloidal product, precipitate and wash the product with absolute ethanol, and vacuum dry at 50°C. The obtained product was tested, and the grafting rate (G) was 31.5%, and the nitrogen content was 2.0%.

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