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Modified starch for grafting guazatine oligomer as well as preparation method and application of modified starch

A biguanide salt and oligomer technology is applied in the field of starch modification and processing, which can solve the problems of poor compatibility between guanidine salt antibacterial agent and polymer matrix, difficult and durable antibacterial effect, and limited application, and achieve high-efficiency broad-spectrum antibacterial Anti-mildew properties, improved antimicrobial properties, high density effects

Inactive Publication Date: 2013-04-03
SHANGHAI FUYUAN PLASTICS SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since guanidinium salts and their derivatives are highly polar compounds, their good water solubility limits their application as antibacterial modifiers in plastics, fibers, rubber, coatings, etc.
Chinese patents ZL 02111048.4 and ZL 03141772.8 disclose methods for preparing materials with high-efficiency broad-spectrum antimicrobial properties by bonding guanidinium salt oligomers to macromolecular chains such as polyolefins, nylon, and polyester, thereby solving the problem of guanidinium salt antibacterial agents. Problems such as poor compatibility with polymer matrix, easy oozing, and long-lasting antibacterial effect
However, the above studies are based on monoguanidine salt oligomers, and there is no report on the application of biguanide salt oligomers with relatively low cost and higher content of antibacterial active ingredients in starch modification.

Method used

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  • Modified starch for grafting guazatine oligomer as well as preparation method and application of modified starch
  • Modified starch for grafting guazatine oligomer as well as preparation method and application of modified starch
  • Modified starch for grafting guazatine oligomer as well as preparation method and application of modified starch

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Preparation of polybutylene diamine carbonate biguanide:

[0038]Take 88g of 1,10-decanediamine, make it into a 40%wt aqueous solution, put it into a 1000ml three-neck bottle, pass in carbon dioxide until the pH value reaches 3, and then distill under reduced pressure to remove water. Under nitrogen protection, add 84g of dicyandiamide, stir and heat up to 90°C, react for 40 minutes, then heat up to 125°C for 6 hours, stop heating; after cooling, biguanide oligomer of butanediamine carbonate is obtained. Its molecular weight is about 800, and the product has high-efficiency antibacterial properties, and its minimum inhibitory concentration is 5.5ppm.

Embodiment 2

[0040] Preparation of polytriethylenetetramine hydrochloride biguanide:

[0041] Take 73g of triethylenetetramine, add it to a 250ml three-necked bottle, add 35.5% hydrochloric acid dropwise to pH = 2, then distill off water under reduced pressure; add 43g of dicyandiamide to the system, stir and raise the temperature under the protection of nitrogen To 110°C, react for 2 hours, then raise the temperature to 180°C, react for 8 hours, stop heating; after cooling, triethylenetetramine hydrochloride biguanide oligomer is obtained. Its molecular weight is about 2500, and the product has high-efficiency antibacterial properties, and its minimum inhibitory concentration is 1.5ppm.

Embodiment 3

[0043] Preparation of polyhexamethylenediamine phosphate biguanide:

[0044] Get 116g of hexamethylenediamine, add it to a 500ml three-necked bottle, add 20% phosphoric acid dropwise to pH=2.5, then distill off the water under reduced pressure; add 85g of dicyandiamide to the system, stir and heat up to React at 150°C for 2 hours, then raise the temperature to 200°C and react for 6 hours, then stop heating; after cooling, hexamethylenediamine phosphate biguanide oligomer is obtained. Its molecular weight is about 1500, and the product has high-efficiency antibacterial properties, and its minimum inhibitory concentration is 9.0ppm.

[0045] Below are the preparation examples of the modified starch of several grafted biguanide oligomers:

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Abstract

The invention provides modified starch for grafting guazatine oligomer as well as a preparation method and an application of the modified starch. The modified starch for grafting guazatine oligomer is obtained by grafting the guazatine oligomer to a starch macromolecular chain by a chemical bonding method, and has a chemical structural formula as shown in the specification, wherein x equals to 2-10, m equals to 2-100, Y is one of Cl<-1>, Br<-1>, NO3<-1>, HCO3<-1> or H2PO4<-1>, and R is a molecular structure obtained by reacting coupling agent, starch and the guazatine. Compared with the prior art, the modified starch provided by the invention effectively avoids the problems that other products are polluted due to antibacterial agent loss, and the antibacterial effect is non-resistant, and relieves the potential hazard of the leaked antibacterial agent to the body health. The modified starch provided by the invention is co-blended with the corresponding paper pump, textile fabric, binder and the like in a proportion of (0.5-10.0wt%), can be used for preparing the products which have high-efficiency broad-spectrum antibacterial anti-mold property and are safe and harmless to the body health, such as papers, textiles and binders.

Description

technical field [0001] The invention relates to a preparation method and application of a modified starch grafted with a biguanide oligomer, and belongs to the field of starch modification and processing applications. Background technique [0002] Starch is a macromolecule formed by polymerizing glucose molecules as structural units. As the second largest natural polymer substance after cellulose, starch has the advantages of rich resources, wide sources, low price, and environmental protection. In addition to industry, it is also widely used in papermaking, textiles, adhesives, medicine, coatings, plastics and other fields. With the development of society and science and the improvement of people's living standards, people have higher and higher requirements for hygiene and health, and an environmentally friendly and healthy living environment has increasingly become the pursuit of human beings. Endowing various materials and their products that are in close contact with h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B31/12C08G73/00D21H17/29D21H21/36D06M15/37D06M15/11C09J11/08
Inventor 肖惠宁管涌郑安呐危大福李书召
Owner SHANGHAI FUYUAN PLASTICS SCI CO LTD
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