Biodegradable phosphorus-free detergent additive and preparation method thereof

A technology of detergent builder and biodegradation, applied in detergent composition, non-surface active detergent composition, organic detergent composition, etc., can solve the problems of poor chelation and dispersion ability, and achieve the increase of side chain charge density Large size, simple preparation method, and the effect of being convenient for industrialized production

Inactive Publication Date: 2013-08-21
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But its chelating and dispersing ability is not as good as the widely used acrylic acid-maleic anhydride copolymer

Method used

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  • Biodegradable phosphorus-free detergent additive and preparation method thereof
  • Biodegradable phosphorus-free detergent additive and preparation method thereof
  • Biodegradable phosphorus-free detergent additive and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047]Add 9.8g of maleic anhydride and 10mL of distilled water into the three-necked flask, raise the temperature and stir to dissolve, and add dropwise 10mL of aqueous solution containing 3.0g of urea to 60°C. After the dropwise addition, a colorless solution is obtained. After 1 hour, a clear solution was obtained; the clear solution prepared above was distilled under reduced pressure at 130°C to obtain white crystals and a small amount of viscous mixture, which was then heated to 180°C. Under reduced pressure, the condensation reaction was carried out for 0.5 hours to obtain orange, The brittle solid is polysuccinimide; 1.47g of glutamic acid is dissolved with 6.5mL of 2mol / L sodium hydroxide solution to obtain a sodium glutamate solution; Add 4.85g polysuccinimide to the three-necked flask, then add 15mL water to suspend it in water, slowly add sodium glutamate solution dropwise under stirring, and adjust the pH to 8 with 2mol / L sodium hydroxide solution, and react The tem...

Embodiment 2

[0049] Add 10.0g of maleic anhydride and 12mL of distilled water into the three-necked flask, raise the temperature and stir to dissolve, and then add dropwise 10mL of aqueous solution containing 3.6g of urea to 70°C. After the dropwise addition, a colorless solution is obtained. After 1 hour, a clear solution was obtained; the clear solution prepared above was distilled under reduced pressure at 120°C to obtain white crystals and a small amount of viscous mixture, and continued to heat up to 160°C. Under reduced pressure, the condensation reaction was carried out for 1.0 hour to obtain orange , brittle solid, which is polysuccinimide; 4.41g of glutamic acid is dissolved with 16.5mL of 2mol / L sodium hydroxide solution to obtain sodium glutamate solution; Add 4.85g of polysuccinimide to a three-necked flask, then add 15mL of water to suspend it in water, slowly add sodium glutamate solution dropwise under stirring, and adjust the pH to 8 with 2mol / L sodium hydroxide solution, T...

Embodiment 3

[0051] Add 9.8g of maleic anhydride and 12mL of distilled water into the three-necked flask, raise the temperature and stir to dissolve, and then add dropwise 10mL of aqueous solution containing 4.2g of urea to 80°C. After the dropwise addition, a colorless solution is obtained. hours, a clear solution was obtained; the clear solution prepared above was distilled under reduced pressure at 110°C to obtain white crystals and a small amount of viscous mixture, and the temperature was continued to 200°C. Under reduced pressure, the condensation reaction was carried out for 1.0 hour to obtain an orange , brittle solid, which is polysuccinimide; 7.35g of glutamic acid is dissolved with 37.5mL of 2mol / L sodium hydroxide solution to obtain sodium glutamate solution; Add 4.85g of polysuccinimide to a three-necked flask, then add 15mL of water to suspend it in water, slowly add sodium glutamate solution dropwise under stirring, and adjust the pH to 9 with 2mol / L sodium hydroxide solution...

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Abstract

The present invention discloses a biodegradable phosphorus-free detergent additive and a preparation method thereof. Specifically the biodegradable phosphorus-free detergent additive is a polyaspartic acid grafted copolymer with a side chain containing a glutamic acid group, wherein maleic anhydride and urea are adopted as starting raw materials, reactions such as amination and heat condensation polymerization are performed to produce polysuccinimide, the polysuccinimide and sodium glutamate are subjected to an aminolysis reaction, and then neutralization, cold precipitation, filtration, concentration and drying are performed to obtain the polyaspartic acid grafted copolymer with the side chain containing the glutamic acid group. According to the present invention, the molecular structure of the polyaspartic acid grafted copolymer does not contain phosphorus, and the polyaspartic acid grafted copolymer has characteristics of no toxicity, good biodegradability, good water solubility, good calcium chelation performance and good calcium dispersion performance, and is a highly efficient and environmental-protection synthesis detergent additive.

Description

technical field [0001] The invention relates to a biodegradable phosphorus-free detergent auxiliary agent and a preparation method thereof. Background technique [0002] For a long time, sodium tripolyphosphate has been widely used in the washing industry as a good performance and low-cost detergent builder. However, due to the large amount of phosphorus-containing detergents discharged into rivers and lakes, the waters become eutrophic, and large-scale red tides occur, which seriously damage the ecological environment. Therefore, since the 1970s, many countries have promulgated laws and regulations to ban and limit phosphorus. Thereby, look for the phosphorus-free builder that is cheap, nontoxic, good performance, environmental pollution-free and can replace sodium tripolyphosphate again, has become a hot field in synthetic detergent development both at home and abroad. [0003] The development of phosphorus-free detergent builders has gone through early phosphorus-free d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11D3/37C11D7/32C08G73/12
Inventor 郭建维杨平陈少华赵建红
Owner GUANGDONG UNIV OF TECH
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