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SiO2/PAA-b-PS amphiphilic Janus microsphere, preparation method and application thereof

A paa-b-ps, amphiphilic technology, applied in the field of leather coating, can solve the problems of harsh reaction conditions, poor coating superhydrophobicity, and difficult structure control, and achieve the effect of easy operation and simple preparation method

Inactive Publication Date: 2022-01-28
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has disadvantages such as harsh reaction conditions and difficult structure control, and the superhydrophobicity of the coating obtained by this method is poor, and the wear resistance of the coating has not been studied.

Method used

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  • SiO2/PAA-b-PS amphiphilic Janus microsphere, preparation method and application thereof
  • SiO2/PAA-b-PS amphiphilic Janus microsphere, preparation method and application thereof
  • SiO2/PAA-b-PS amphiphilic Janus microsphere, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A SiO 2 The preparation method of / PAA-b-PS amphiphilic Janus microspheres comprises the steps:

[0045] Step 1, 0.05g of hollow SiO with a particle size of 30nm made in the laboratory 2 Microspheres were added to 10mL absolute ethanol for ultrasonic dispersion, and then SiO 2 γ-aminopropyltriethoxysilane with 30% mass of microspheres, then heated to 50°C, reacted for 2h, centrifuged, washed, and dried to obtain γ-aminopropyltriethoxysilane modified hollow SiO 2 Microspheres.

[0046] Step 2: Add 7.206g of acrylic acid and 0.093g of 1,1-stilbene into 30g of deionized water, raise the temperature to 60°C, stir mechanically for 5min, add 0.062g of potassium persulfate, keep it warm for 4h, then drop into the system at the same time Add 2.6038g of styrene and 8.02g of 0.25% potassium persulfate aqueous solution, add dropwise for 30 minutes, and finally keep warm for 4 hours to obtain the amphiphilic block copolymer PAA-b-PS emulsion, and use sodium chloride to demulsify...

Embodiment 2

[0051] A SiO 2 The preparation method of / PAA-b-PS amphiphilic Janus microspheres comprises the steps:

[0052] Step 1, 0.30g of hollow SiO with a particle size of 500nm made in the laboratory 2 Microspheres were added to 60mL absolute ethanol for ultrasonic dispersion, and then SiO 2 γ-aminopropyltriethoxysilane with 80% mass of microspheres, then heated to 80°C, reacted for 12h, centrifuged, washed, and dried to obtain γ-aminopropyltriethoxysilane modified hollow SiO 2 Microspheres.

[0053] Step 2: Add 7.206g of acrylic acid and 0.620g of 1,1-stilbene into 80g of deionized water, raise the temperature to 90°C, stir mechanically for 30min, add 0.496g of potassium persulfate, keep warm for 24h, and then add Add dropwise 31.245g of styrene and 8.22g of 2.75% potassium persulfate aqueous solution for 80 minutes, and finally keep the temperature for 24 hours to obtain the amphiphilic block copolymer PAA-b-PS emulsion, which is broken by sodium chloride. The milk was centrifu...

Embodiment 3

[0058] A SiO 2 The preparation method of / PAA-b-PS amphiphilic Janus microspheres comprises the steps:

[0059] Step 1, 0.10g particle size is 150nm laboratory-made solid SiO 2 Microspheres were added to 20mL absolute ethanol for ultrasonic dispersion, and then SiO 2 γ-aminopropyltriethoxysilane with 40% mass of microspheres, then heated to 55°C, reacted for 4h, centrifuged, washed, and dried to obtain γ-aminopropyltriethoxysilane modified solid SiO 2 Microspheres.

[0060] Step 2: Add 7.206g of acrylic acid and 0.124g of 1,1-stilbene into 40g of deionized water, raise the temperature to 65°C, stir mechanically for 10 minutes, add 0.093g of potassium persulfate, keep the reaction for 8 hours, and then drop into the system at the same time Add 3.4707g of styrene and 8.06g of 0.75% potassium persulfate aqueous solution, add dropwise for 40 minutes, and finally keep warm for 8 hours to obtain the amphiphilic block copolymer PAA-b-PS emulsion, and use sodium chloride to demulsi...

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Abstract

The invention discloses a SiO2 / PAA-b-PS amphiphilic Janus microsphere, a preparation method and application thereof, and belongs to the technical field of leather coatings. The SiO2 / PAA-b-PS amphiphilic Janus microsphere is characterized in that one end of the surface of a SiO2 microsphere is modified with a hydrophilic group amino group, and the other end of the surface of the SiO2 microsphere is grafted with an amphiphilic block copolymer PAA-b-PS to provide an organic hydrophobic chain; SiO2 / PAA-b-PS amphiphilic Janus microspheres are oriented and arranged on the surface of leather, an inorganic end faces a polyurethane prepolymer coating on the surface of the leather, an organic hydrophobic chain faces air, and the super-hydrophobicity of the coating is realized by utilizing a micro-nano rough structure constructed by the SiO2 / PAA-b-PS amphiphilic Janus microspheres and a low-surface-energy substance provided by the organic hydrophobic chain segment; and the reactive group amino group at the inorganic end and the isocyanate group on the molecular chain of the polyurethane prepolymer generate chemical crosslinking while the polyurethane prepolymer generates adhesion to the SiO2 / PAA-b-PS amphiphilic Janus microspheres, so that the wear resistance of the coating is improved.

Description

technical field [0001] The invention belongs to the technical field of leather coating, and relates to a SiO 2 / PAA-b-PS amphiphilic Janus microsphere and its preparation method and application. Background technique [0002] Due to their special wettability, superhydrophobic surfaces not only show attractive prospects in the fields of self-cleaning, surface anticorrosion, oil-water separation, and anti-icing, but also have potential applications in daily life, biomedicine, and military fields. value. However, in the actual application process, low surface energy substances are easily decomposed by the stimulation of temperature, light, and strong oxidants, and the micro-nano rough structure is also easily damaged by physical effects such as mechanical friction or abrasion, thus affecting the adhesion of the coating. force and wettability, resulting in the decline or loss of superhydrophobic properties, limiting its application. Therefore, the key to the application of sup...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F292/00C08F220/06B01J13/02C14C15/00D06N3/18
CPCC08F292/00B01J13/02C14C15/00D06N3/183C08F220/06
Inventor 鲍艳畅菁香张元霞高璐张文博刘超祝茜
Owner SHAANXI UNIV OF SCI & TECH
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