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An ultra-low concentration type high-efficiency compound emulsifier

A compound emulsifier and emulsion technology, applied in chemical instruments and methods, chemical/physical processes, dissolution, etc., can solve problems such as large oxygen consumption, achieve low concentration, multiple formula combinations, and reduce emissions

Active Publication Date: 2020-01-21
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although most surfactants can be biodegraded and lose their surface activity, further degradation still requires a large amount of oxygen consumption, and cationic surfactants are also highly toxic to aquatic animals, thus reducing the surface activity in emulsions. The amount of active agent has significant economic and environmental benefits

Method used

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  • An ultra-low concentration type high-efficiency compound emulsifier
  • An ultra-low concentration type high-efficiency compound emulsifier
  • An ultra-low concentration type high-efficiency compound emulsifier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Example 1: Characterization of nanoparticles.

[0048] Nano-alumina (Al 2 o 3 ), purity>99.8%, primary particle size 13nm, product of Singma Company; nano silicon dioxide (SiO2), model HL-200, purity>99.8%, primary particle size 20nm, product of Wuxi Jinding Longhua Company. figure 1 Scanning electron microscope (SEM) and transmission electron microscope (TEM) images of the two particles are given.

[0049] The two kinds of particles were ultrasonically dispersed in pure water to prepare a dispersion with a concentration of 0.1 wt.%, and left to stand at 25° C. for 24 hours, and then the zeta potential and particle size of the particles were measured with ZetaPLAS (Brookhaven). For nano-alumina particles, the measured zeta potential in pure water is +55mV, and the average particle size is 198nm; further measurements show that the isoelectric point of nano-alumina particles is 10.8, that is, within the range of pH2.7 , the particles are all negatively charged. In tap...

Embodiment 2

[0050] Example 2: Nano-alumina particles and CTAB composite emulsifier stabilize decane-water emulsion, and the effect of CTAB concentration.

[0051] Use decane (purity >98%, product of Sinopharm Group) as the oil phase, prepare emulsion with pure water (pH=6.1) at a volume ratio of 1:1 (7mL oil / 7mL water), and use a homogenizer (IKAT18 basic type) , S18N-10G rotor) emulsified at 11,000rpm for 2min. The emulsifiers are single nano-alumina particles with different concentrations, single CTAB with different concentrations, and composites of 0.5wt.% nano-alumina particles and CTAB with different concentrations.

[0052] figure 2 Experimental results are given. It can be seen that a single nano-alumina particle cannot stabilize the emulsion in the concentration range of 0.1wt.% to 1.0wt.%, such as figure 2 As shown in (A); a single CTAB can stabilize the O / W type emulsion, but the CTAB concentration needs to be greater than or equal to 1.0mM (cmc=0.9mM), such as figure 2 S...

Embodiment 3

[0054] Example 3, nano-alumina particles and CTAB composite emulsifier stabilize decane-water emulsion, the effect of particle concentration.

[0055] Fix the CTAB concentration at 0.01mM, change the particle concentration, and carry out emulsification experiments. The results are as follows: Figure 4shown. It can be seen that to obtain a stable emulsion, the particle concentration only needs to reach 0.0001wt.% and above, and the diameter of oil droplets decreases slightly with the increase of particle concentration, most of which are between 30-100 μm. These emulsions remained stable after one week.

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Abstract

The invention discloses an ultra-low concentration type high-efficiency composite emulsifier, which belongs to the field of colloid and interface chemistry. The high-efficiency composite emulsifier of the invention is composed of inorganic nanoparticles and ionic surfactants, which have the same charge in the water medium. The composite emulsifier of the present invention is an efficient O / W type emulsifier, wherein the minimum effective concentration of nanoparticles can reach 0.0001wt.%, and the minimum effective concentration of ionic surfactant can reach its critical micelle concentration (cmc) one-thousandth of. Using this high-efficiency composite emulsifier can emulsify alkanes, aromatic hydrocarbons and triglyceride oily substances into a stable O / W emulsion, and the droplet diameter is between 150 μm and 1 μm, which decreases with the increase of emulsifier concentration. The high-efficiency composite emulsifier of the invention can greatly reduce the consumption and discharge of surfactants, and has extremely high economic and environmental benefits.

Description

technical field [0001] The invention relates to an ultra-low concentration type high-efficiency composite emulsifier, which belongs to the field of colloid and interface chemistry. Background technique [0002] Emulsion is a dispersion system formed by dispersing a liquid in another liquid immiscible with it in the form of liquid droplets, usually an oil-water dispersion system, divided into O / W type and O / W type category. The liquid phase which exists in the form of droplets is called the dispersed phase (internal phase or discontinuous phase), while the other liquid phase is called the continuous phase (external phase or dispersion medium). Emulsions are widely used in many different technical fields, such as food, cosmetics, pharmaceuticals, pesticides, oil transportation, mechanical processing, emulsion polymerization, emulsion explosives and other industries. [0003] It is well known that mixing pure oil and water phases usually does not form stable emulsions. To ob...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01F17/00B01F17/18B01F17/32B01F17/12C09K23/00C09K23/12C09K23/18C09K23/32
CPCC09K23/002C09K23/00C09K23/017
Inventor 崔正刚许茂东蒋建中裴晓梅宋冰蕾
Owner JIANGNAN UNIV
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