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Preparation method and application of temperature-sensitive nano silicon dioxide surfactant with asymmetric structure

A nano-silica, asymmetric structure technology, applied in chemical instruments and methods, chemical dehydration/demulsification, chemical/physical processes, etc., can solve the problem of slow reaction speed, easy oxidation of cuprous bromide, and influence on reaction Stability and other issues, to achieve the effect of easy separation, beneficial to crude oil transportation, convenient use and high efficiency

Active Publication Date: 2021-06-11
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reaction speed of ATRP polymerization method is slow, and cuprous bromide is used as the catalyst, and cuprous bromide is easy to oxidize, which affects the stability of the reaction

Method used

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  • Preparation method and application of temperature-sensitive nano silicon dioxide surfactant with asymmetric structure
  • Preparation method and application of temperature-sensitive nano silicon dioxide surfactant with asymmetric structure
  • Preparation method and application of temperature-sensitive nano silicon dioxide surfactant with asymmetric structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] This example provides an asymmetric structure of HO-SiO 2 -PNIPAM surfactant, it is synthesized by the following steps:

[0057] At room temperature, add ammonia water (25wt%, 20mL) and ethanol (125mL) into the round bottom flask. The mixture was stirred at 700 rpm for 20 min. Then TEOS (8 mL) was added dropwise using a constant pressure dropping funnel. After stirring for 20h, centrifuge at 8000rpm to separate SiO 2Nanoparticles. Wash with absolute ethanol and deionized water three times respectively, and dry the product under vacuum at 50°C for 12 hours. SiO 2 Nanoparticles were treated in piranha solution at 90°C for 2h. After the reaction, it was filtered with suction, washed three times with deionized water, and dried in vacuum at 50°C for 12 hours.

[0058] Take 0.5g of pretreated SiO 2 The particles were added to 20mL of distilled water, and 4mL of DDAB solution (60mg / L) was added, followed by ultrasonic analysis for 30min. The above mixed solution was p...

Embodiment 2

[0072] This example provides an asymmetric structure of HO-SiO 2 -PNIPAM surfactant, it is synthesized by the following steps:

[0073] At room temperature, add ammonia water (25wt%, 20mL) and ethanol (125mL) into the round bottom flask. The mixture was stirred at 700 rpm for 20 min. Then TEOS (8 mL) was added dropwise using a constant pressure dropping funnel. After stirring for 20h, centrifuge at 8000rpm to separate SiO 2 Nanoparticles. Wash with absolute ethanol and deionized water three times respectively, and dry the product under vacuum at 50°C for 12 hours. SiO 2 Nanoparticles were treated in piranha solution at 90°C for 2h. After the reaction, it was filtered with suction, washed three times with deionized water, and dried in vacuum at 50°C for 12 hours.

[0074] Take 0.5g of pretreated SiO 2 The particles were added to 20mL of distilled water, and 4mL of DDAB solution (60mg / L) was added, followed by ultrasonic analysis for 30min. The above mixed solution was ...

Embodiment 3

[0079] This example provides an asymmetric structure of HO-SiO 2 -PNIPAM surfactant, it is synthesized by the following steps:

[0080] At room temperature, add ammonia water (25wt%, 20mL) and ethanol (125mL) into the round bottom flask. The mixture was stirred at 700 rpm for 20 min. Then TEOS (8 mL) was added dropwise using a constant pressure dropping funnel. After stirring for 20h, centrifuge at 8000rpm to separate SiO 2 Nanoparticles. Wash with absolute ethanol and deionized water three times respectively, and dry the product under vacuum at 50°C for 12 hours. SiO 2 Nanoparticles were treated in piranha solution at 90°C for 2h. After the reaction, it was filtered with suction, washed three times with deionized water, and dried in vacuum at 50°C for 12 hours.

[0081] Take 0.5g of pretreated SiO 2 The particles were added to 20mL of distilled water, and 4mL of DDAB solution (60mg / L) was added, followed by ultrasonic analysis for 30min. The above mixed solution was ...

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Abstract

The invention relates to a preparation method and application of a temperature-sensitive nano silicon dioxide surfactant with an asymmetric structure. The method comprises the following steps: realizing interface protection of SiO2 nano particles by using paraffin, enabling 3-aminopropyltriethoxysilane to react with 2-bromoisobutyryl bromide to generate a silane coupling agent with an initiating group (-Br) before introducing an initiator site (-Br), and then reacting with paraffin spheres in methanol to hydrolyze BIB-APTES to the surface of SiO2, and dissolving the paraffin with chloroform to obtain the asymmetrically modified SiO2 initiator; and then grafting PNIPAM in one side of the obtained asymmetric SiO2 initiator by using a single electron transfer free radical living polymerization (SET-LRP) method, so as to obtain the temperature-sensitive nano silicon dioxide surfactant with the asymmetric structure. The surfactant has the characteristics of excellent mechanical properties, thermal stability, wear resistance, environmental friendliness and the like.

Description

technical field [0001] The invention belongs to the technical field of functional polymer materials, and more specifically relates to a method for synthesizing a temperature-responsive nanometer silicon oxide surfactant with an asymmetric structure. Background technique [0002] "Janus" is a two-faced god in ancient Roman mythology. French physicist Professor de Gennes first proposed to use "Janus particles" to refer to those particles with different chemical compositions on the surface. Due to its asymmetric and anisotropic structure, Janus particles have unique chemical and physical properties and can achieve multiple functions. In recent years, they have attracted widespread attention from the academic community. They are used in the fields of catalysts, functional coatings, biomedicine, and emulsion stabilizers. There are broad application prospects. [0003] Poly(N-isopropylacrylamide) (PNIPAM) is currently the most studied temperature-sensitive polymer in biological a...

Claims

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Application Information

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IPC IPC(8): C08F292/00C08F220/54B01F17/54B01F17/22C10G33/04C09K23/22C09K23/54
CPCC08F292/00C10G33/04C09K23/002C09K23/16C08F220/54
Inventor 赵玉军徐艳李晓炫
Owner TIANJIN UNIV
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