Microemulsion with high heat stability

A microemulsion and droplet technology, applied in the field of microemulsion, can solve the problems of poor temperature resistance, damage stability, and high production cost, and achieve the effects of wide temperature range, good stability, and low cost

Inactive Publication Date: 2007-06-06
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing oil-in-water microemulsion has the disadvantages of poor temperature resistance and high production cost
Most microemulsions can only be stable in the range of 0-35°C, and higher or lower temperatures will destroy their stability

Method used

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  • Microemulsion with high heat stability
  • Microemulsion with high heat stability
  • Microemulsion with high heat stability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The oil phase is furfural, the emulsifier is N,N-dimethylformamide (DMF), and the water phase is water. Mix uniformly according to the volume ratio of N, N-dimethylformamide: furan formaldehyde: water = 3:1:1, 3:1:4, 3:1:6 and 3:1:8 to obtain a microemulsion sample 1 # -4 # . The ternary phase diagram is shown in Figure 1. Point A in the ternary phase diagram is N, N-dimethylformamide: furan formaldehyde = 3:1. Select different samples 1 along the line a # -4 # The measured particle size is shown in Table 1 and Figure 3. The particle size decreases gradually from the water angle. The cryo-etching scanning electron microscope photo of the sample is shown in Figure 2, and it can be observed that the shape of the droplet is spherical. Freeze-thaw cycle, centrifugation, heat storage, refrigeration and other treatments did not find delamination or other damage to the uniformity, indicating that the system has ultra-high stability. The results are shown in Table 2.

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Embodiment 2

[0032] The oil phase is xylene, the emulsifier is dimethyl sulfoxide, and the water phase is water. Its volume ratio is 3:1:4 to 3:1:8. Mix and stir. The measured particle size is 150-220nm. The stability test results are the same as Table 2.

Embodiment 3

[0034] Cyclohexane is used for the oil phase, ethanol (80%)-dimethylsulfoxide mixture with a volume ratio of 1:1 is used as the emulsifier, and water is used for the water phase. The volume ratio of the oil phase, emulsifier and water is 2:1:3-2:1:6. Mix and stir. The measured particle size is 110-200nm, and the stability test results are the same as Table 2.

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Abstract

The present invention is one kind of microemulsion with high heat stability, and belongs to the field of microemulsion technology. The microemulsion is prepared with water phase, oil phase and emulsifier and through mixing. The emulsifier is water soluble and liposoluble non-surfactant matter, and is selected from dimethyl sulfoxide, N, N-dimethyl formamide, ethanol, etc. and the oil phase is selected fromn-hexanol, furaldehyde, tetrahydrofuran, etc. The emulsifier and the oil phase account for 10-80 wt % of the microemulsion, and the emulsifier is 1.2-5 times the volume of the oil phase. The microemulsion has the liquid drop size of 50-500 nm, is stable in the temperature range of -10-80 deg.c, and may be used in tertiary oil recovery, daily use chemical, pesticide carrier and other fields.

Description

technical field [0001] The invention relates to a microemulsion with high temperature resistance, belonging to the technical field of microemulsion. Background technique [0002] Microemulsions were first discovered by Hoar and Schulman in 1943. In 1950, Schulman proposed the concept of "microemulsions" and described such systems. It was not until 1985 that Shah proposed a relatively complete definition of "microemulsion": "microemulsion" is a thermodynamically stable, isotropic liquid produced by two mutually incompatible liquids under the action of a molecular interface film of a surfactant. , transparent dispersion system. Due to the unique structural characteristics of microemulsion and high stability at room temperature, its application range is very wide, and it has been practically used in oil recovery technology, daily chemical industry, drug carrier and other fields. [0003] Traditional microemulsions are usually spontaneously formed by the three components of su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01F3/08
Inventor 侯万国倪鹏
Owner SHANDONG UNIV
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