Graft copolymer of amino-containing starch and methyl acrylate

A technology of methyl acrylate and graft copolymer, applied in the field of graft copolymer, can solve problems such as heavy metal ions need to be improved

Inactive Publication Date: 2010-06-02
GUANGZHOU UNIVERSITY
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Problems solved by technology

But the ability of the heavy metal chelating agent disclosed in

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  • Graft copolymer of amino-containing starch and methyl acrylate

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Experimental program
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preparation example

[0013] The grafting rate and nitrogen content of the following examples are determined by the following method:

[0014] Determination of nitrogen content: use the Kjeldahl method to determine the nitrogen content in the sample, and then calculate it according to the following formula:

[0015] Nitrogen content%=[(V-V 0 )N / W]×0.014×100

[0016] Where: V-the number of milliliters of HCl consumed, mL;

[0017] V 0 -Milliliters of HCl consumed in the blank experiment;

[0018] N-HCl equivalent concentration

[0019] W- sample weight, g

[0020] Method for measuring grafting rate: Gravimetric method is used to determine the grafting rate (G, %). Wrap the dried crude product with filter paper, place it in a 250ml Soxhlet extractor to extract the homopolymer, wash, filter and vacuum dry to constant weight to obtain a pure graft copolymer.

[0021] Calculated as follows:

[0022] G = m G - m S m G X 100 %

[0023] Where: m S ——Reaction starch quality, g;

[002...

example 1

[0026] Take 5g of tapioca starch and 50mL of distilled water into a 250mL three-necked flask, stir into starch milk and then pass nitrogen into it; add 0.15g of cerium ammonium nitrate and 15g of methyl acrylate, heat up to 30℃ and react for 9h, use NaCO 3 The solution is neutralized to neutrality to obtain starch grafted methyl acrylate copolymer. Take 2g of the obtained copolymer (dry basis), add 30mL of hydrazine hydrate, stir, condense and reflux at 85°C for 10h to obtain a white gel-like product, precipitate and wash the product with absolute ethanol, and dry under vacuum at 50°C to obtain hydrazine amine hydrate The modified starch is grafted with methyl acrylate copolymer. The graft ratio (G) of the copolymer was measured to be 73.2%, and the nitrogen content was 13.8%.

example 2

[0027] Example 2 Take 10g of potato starch and 50mL of distilled water into a 250mL three-necked flask, stir into starch milk and then pass in nitrogen; add 0.05g of ammonium persulfate and 6.5g of methyl acrylate, heat up to 30℃ for 2h reaction, use NaCO 3 The solution is neutralized to neutrality to obtain starch grafted methyl acrylate copolymer. Take 2g of the obtained copolymer (dry basis), add 15mL of hydrazine hydrate, stir, condense and reflux at 95°C for 6h to obtain a white gel-like product, precipitate and wash the product with absolute ethanol, and dry under vacuum at 50°C to obtain hydrazine amine hydrate The modified starch is grafted with methyl acrylate copolymer. The graft rate (G) of the copolymer was measured to be 29.12%, and the nitrogen content was 1.88%.

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Abstract

The invention provides a graft copolymer of amino-containing starch and methyl acrylate. The graft copolymer has starch as a main chain and polymethyl acrylate as a branched chain, and is characterized in that part of formyl radicals on the polymethyl acrylate branched chain are aminated by hydrazine hydrate into -CONHNH2; the grafting rate is 20 to 99 percent; and the nitrogen content is 1 to 20 percent. The copolymer can be used as a metal chelating agent to treat electroplating wastewater. When the copolymer is dissolved in the electroplating wastewater, functional groups in molecules are rapidly chelated with metal ions to form insoluble products, and the own network structure of the copolymer can allow precipitate to rapidly flocculate and sink at the same time so as to achieve the aim of removing the metal ions in the wastewater, wherein the removal rate of heavy metal ions is as high as over 99 percent.

Description

Technical field [0001] The invention relates to the field of polymer materials, in particular to graft copolymers. 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 human living environment, affecting people's quality of life, and also seriously restricting the development of the electronics industry, so how to solve the problem of electroplating pollution The treatment of electroplating wastewater has become a top priority in the field of environmental protection. At present, there are many methods used to remove heavy metal ions, such as ion exchange, reverse osmosis, adsorption, biological treatment, etc. However, due to various reasons, the current domestic and foreign heavy metal wastewater treatment technology is dominant and the most applied. The most widespread is still the chemical precipitation method. However, the chemical p...

Claims

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Application Information

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IPC IPC(8): C08F251/00C08F220/14C08F8/30C02F1/56C02F103/16
Inventor 尚小琴罗楠
Owner GUANGZHOU UNIVERSITY
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