Cationic surfactant and application thereof

A surfactant, cationic technology, used in liquid separation, separation methods, grease/oily substances/floating matter removal devices, etc. and other problems, to achieve the effect of small molecular weight, long storage period and low free formaldehyde content

Active Publication Date: 2016-01-13
GUANGZHOU ZHENQING ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Conventional alkylamide polyamine cationic surfactant is a kind of commonly used cationic surfactant, which has a hydrophilic group and a lipophilic group. Under certain pH conditions, a certain concentration of conventional alkylamide polyamine Amine cationic surfactants have a certain ionic strength, such as oleic acid amide triethylenetetramine, etc., which are positively charged under acidic conditions, have good flocculation and demulsification effects, and are resistant to hydrolysis, but they are resistant to high-concentration pollutants and high COD Industrial wastewater, the effect is not significant, the reason may be that the molecular weight is too small and the ionic strength is low
Therefore, increasing its molecular weight to improve the flocculation and demulsification effect is convenient for the treatment of high COD industrial wastewater, but the conventional alkyl amido polyamine cationic surfactant has only one hydrophilic group, the molecular weight is below 1000, and it does not have bifunctionality The group is not conducive to the formation of multimers between the molecules of conventional alkylamide polyamine cationic surfactants

Method used

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  • Cationic surfactant and application thereof
  • Cationic surfactant and application thereof
  • Cationic surfactant and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for preparing a cationic surfactant, which is prepared through three process steps of metering and mixing, methylol reaction, and polycondensation reaction, as follows: add 400 parts by weight of water to the reaction kettle, and heat up to 60°C , adjust the pH to 9 with an alkaline substance; then add 40 parts by weight of an alkylamide polyamine cationic surfactant, add 70 parts by weight of formaldehyde, heat up to 80°C, and react for 40 minutes; adjust the pH to 2 with an acidic substance, Raise the temperature and react at 85°C for 4 hours; keep warm for 30 minutes to obtain the cationic surfactant.

[0029] The cationic surfactant prepared in this example has a cationic degree of 30% (the cationic degree is tested by colloid titration), a density of 0.98 g / ml, and an effective storage period of more than 1 year.

Embodiment 2

[0031] A method for preparing a cationic surfactant, which is prepared through three process steps of metering and mixing, methylol reaction, and polycondensation reaction, as follows: add 800 parts by weight of water to the reaction kettle, and heat up to 65°C , adjust the pH to 9.5 with an alkaline substance; then add 120 parts by weight of an alkyl amidopolyamine cationic surfactant, add 240 parts by weight of formaldehyde, heat up to 85 ° C, and react for 60 minutes; adjust the pH to 4 with an acidic substance, Raise the temperature, react at 95° C. for 2 hours, and keep warm for 30 minutes to obtain a cationic surfactant.

[0032] The cationic surfactant prepared in this example has a cationic degree of 32%, a density of 1.01 g / ml, and an effective storage period of more than 1 year.

Embodiment 3

[0034] A method for preparing a cationic surfactant, which is prepared through three process steps of metering and mixing, methylol reaction, and polycondensation reaction, as follows: add 900 parts by weight of water to the reaction kettle, and heat up to 65°C , adjust the pH to 8.5 with an alkaline substance; then add 60 parts by weight of an alkyl amido polyamine cationic surfactant, add 110 parts by weight of formaldehyde, heat up to 80-85 ° C, and react for 60 minutes; use an acidic substance to adjust the pH to 3. Raise the temperature and react at 90°C for 3 hours; keep warm for 60 minutes to obtain the cationic surfactant.

[0035] The cationic surfactant prepared in this example has a cationic degree of 32%; a density of 1.03 g / ml, and an effective storage period of more than 1 year.

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Abstract

The invention discloses a cationic surfactant which is prepared through the three sequential process steps of metering and mixing, hydroxymethyl reaction and polycondensation reaction. The preparation method specifically comprises the following steps: 400-900 parts by weight of water is added into a reaction kettle, and is heated to a temperature of 55-65 DEG C; the pH value is regulated to 8.5-9.5 with an alkaline substance; 40-120 parts by weight of an alkylamidopolyamine cationic surfactant is added; 70-240 parts by weight of formaldehyde is added; the temperature is increased to 60-85 DEG C, and a reaction is carried out for 40-60min; the pH value is regulated to 2-4 with an acidic substance; the temperature is increased to 85-95 DEG C and a reaction is carried out for 2-4h; and the temperature is maintained and a reaction is carried out for 0.5-1h, such that the cationic surfactant is obtained. The cationic surfactant provided by the invention has the advantages of high cationic degree, large molecular weight, and long storage life. The cationic surfactant has suspension and diffusion property in water, and is miscible with water with any ratio.

Description

technical field [0001] The invention relates to a surfactant, in particular to a cationic surfactant and its application. Background technique [0002] Conventional alkylamide polyamine cationic surfactants are a class of commonly used cationic surfactants, which have a hydrophilic group and a lipophilic group. Under certain pH conditions, a certain concentration of conventional alkylamide polyamine Amine cationic surfactants have a certain ionic strength, such as oleic acid amide triethylenetetramine, etc., which are positively charged under acidic conditions, have good flocculation and demulsification effects, and are resistant to hydrolysis, but they are resistant to high-concentration pollutants and high COD For industrial wastewater, the effect is not significant, and the reason may be that the molecular weight is too small and the ionic strength is low. Therefore, increasing its molecular weight to improve the flocculation and demulsification effect is convenient for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/02C08G65/34C02F1/40C02F1/56
Inventor 宋澄章
Owner GUANGZHOU ZHENQING ENVIRONMENTAL PROTECTION TECH
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