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Starch derivative copolymer and preparation method and application thereof

A technology of starch derivatives and copolymers, which is applied in the field of new starch derivatives copolymers and their preparation, and can solve the problems of unproposed starch derivatives and modified products that cannot be dispersed

Active Publication Date: 2011-08-10
SHANGHAI SUNRISE POLYMER MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This document does not propose the idea of ​​starch derivatives, and because starch has a relatively high molecular weight, its modified products cannot be used for the dispersion of materials such as cement

Method used

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  • Starch derivative copolymer and preparation method and application thereof
  • Starch derivative copolymer and preparation method and application thereof
  • Starch derivative copolymer and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] In a four-neck flask equipped with a condenser, a thermometer and a stirring device, add 480.0 g of maltodextrin with a DE value of 11, 20.0 g of maleic anhydride, and 150.0 g of water, raise the temperature to 80-85 °C, and continue stirring for 2.5 hours. Carry out esterification reaction, and then lower the temperature to below 50°C to obtain maltodextrin maleic acid monoester solution, which is designated as ES-1.

[0033] Then add 468.0g of maltodextrin maleic acid monoester solution ES-1 and 217.0g of water into the 1000mL reaction kettle, stir and heat up to the reaction temperature of 80±2°C, and then dropwise add 8.0g of ammonium persulfate dissolved in 72.0g of water The initiator solution obtained, the dropping time is controlled at about 210 minutes; After starting to add the initiator solution dropwise, add dropwise the chain transfer agent solution obtained by dissolving 2.0g 3-mercaptopropionic acid in 20.0g water, and the dropping time is controlled At a...

Embodiment 2

[0035] In a four-neck flask equipped with a condenser, a thermometer and a stirring device, add 480.0 g of maltodextrin with a DE value of 14, 20.0 g of maleic anhydride, and 150.0 g of water, raise the temperature to 80°C to 85°C, and continue stirring for 2.5 hours , carry out the esterification reaction, and then lower the temperature to below 50°C to obtain a maltodextrin maleic acid monoester solution, which is designated as ES-2.

[0036]Then add 156.0g of maltodextrin maleic acid monoester solution ES-2, 16.0g of maleic anhydride, 52.0g of water into the 1000mL reactor, stir and heat up to the reaction temperature of 80±2°C, then dropwise add 8.0g of persulfuric acid The initiator solution obtained by dissolving ammonium in 72.0g water, the dropping time is controlled at about 210 minutes; after starting to add the initiator solution dropwise, add dropwise the chain transfer agent obtained by dissolving 2.0g 3-mercaptopropionic acid in 20.0g water Solution, the dropping...

Embodiment 3

[0038] In a four-neck flask equipped with a condenser, a thermometer and a stirring device, add 450.0 g of maltodextrin with a DE value of 16, 50.0 g of maleic anhydride, and 150.0 g of water, raise the temperature to 90°C to 95°C, and continue stirring for 2 hours , carry out the esterification reaction, and then lower the temperature to below 50°C to obtain a maltodextrin maleic acid monoester solution, which is designated as ES-3.

[0039] Then add 312.0g of maltodextrin maleic acid monoester solution ES-3 and 117.4g of water into the 1000mL reactor, stir and heat up to the reaction temperature of 80±2°C, then add dropwise The initiator solution obtained, the dropping time is controlled at about 270 minutes; After starting to drop the initiator solution, drop the chain transfer agent solution obtained by dissolving 1.6g 2-mercaptopropionic acid in 20.0g water, and the dropping time is controlled At about 240 minutes; then add dropwise the monomer aqueous solution composed o...

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Abstract

The invention discloses a starch derivative copolymer and a preparation method and application thereof. The starch derivative copolymer is prepared by copolymerizing 30 to 95 percent of amylin maleic acid monoester, 5 to 20 percent of unsaturated carboxylic acid monomer and 0 to 65 percent of other copolymerizable monomer C in aqueous solution at the temperature of 50-100DEG C. The starch derivative copolymer can be used as a cement dispersing agent, a cement mortar additive and a water reducer for concrete, and has the advantages of low cost, good water solubility, good compatibility when compounded with a polycarboxylic acid water reducer, and the like.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and relates to a water reducer for cement, mortar or concrete, in particular to a novel starch derivative copolymer and its preparation method and application. Background technique [0002] With the vigorous development of our country's economy, the country has increased its efforts in infrastructure and housing construction year by year, so the demand for concrete has continued to rise, and the amount of admixtures has also increased year by year. By the end of 2005, there were more than 200 synthetic high-efficiency superplasticizer enterprises in China, with an annual output of 1.11 million tons of high-efficiency superplasticizers and an annual sales revenue of about 5.1 billion yuan, ranking first in the world. There are two main types of concrete water reducers used in the market: one is naphthalenesulfonate formaldehyde condensate high-efficiency water reducer, its water reduci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F290/10C08F290/06C08B31/04C08B37/16C04B24/26C04B103/40C04B103/30
Inventor 冯中军郑柏存傅乐峰王玲芳
Owner SHANGHAI SUNRISE POLYMER MATERIAL CO LTD
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