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Silicon dioxide loaded chitosan modified waterborne polyurethane acrylate composite emulsion, preparation method therefor and application of composite emulsion

A polyurethane acrylate and chitosan-loaded technology, which is applied in polyurea/polyurethane coatings, applications, antifouling/underwater coatings, etc., can solve the problem of blocking the outward diffusion of water vapor molecules on the surface of the human body, affecting the wearing comfort of leather products, It is easy to breed bacteria and other problems, and achieve the effect of improving antibacterial properties, improving water vapor permeability and antibacterial properties, and improving water vapor permeability

Active Publication Date: 2019-12-20
SHAANXI UNIV OF SCI & TECH
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Problems solved by technology

However, due to the dense structure of water-based polyurethane acrylate after film formation, the coating forms a dense film on the leather surface, which blocks the outward diffusion of water vapor molecules on the human body surface, and then easily breeds bacteria, which affects the wearing comfort of leather products.
Due to its unique macropore structure, macroporous silica is easy to load the macromolecular antibacterial agent chitosan, and prepared macroporous silica-loaded chitosan nanoparticles (MSN@CS), so that chitosan can be released continuously to Long-term antibacterial effect; at the same time, it provides a certain channel for the diffusion of water vapor, which can theoretically improve the hygienic performance of the current water-based polyurethane acrylate after film formation, that is, water vapor permeability and antibacterial properties, but the existing technology has not passed. This method improves the waterborne polyurethane acrylate film

Method used

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  • Silicon dioxide loaded chitosan modified waterborne polyurethane acrylate composite emulsion, preparation method therefor and application of composite emulsion
  • Silicon dioxide loaded chitosan modified waterborne polyurethane acrylate composite emulsion, preparation method therefor and application of composite emulsion
  • Silicon dioxide loaded chitosan modified waterborne polyurethane acrylate composite emulsion, preparation method therefor and application of composite emulsion

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preparation example Construction

[0036] A kind of preparation method of silicon dioxide loaded chitosan modified water-based polyurethane acrylate composite emulsion of the present invention, prepared a kind of dendritic macroporous silica of amino modification, and it is loaded antibacterial agent chitosan, then Incorporate it into waterborne polyurethane acrylate composite emulsion by physical blending method to obtain macroporous silica-loaded chitosan (MSNs@CS) / waterborne polyurethane acrylate composite emulsion, which can be used as leather finishing agent, specifically prepared The method includes the following steps,

[0037] Step 1, the preparation of aminated macroporous silica, using the co-solvent method with hexadecyl pyridinium bromide as a template, prepared a macroporous silica nanostructure with a central radial channel structure that gradually increases from the inside to the outside. Particles, while the skeleton is uniformly modified with amino groups, there are two methods,

[0038] The f...

Embodiment 1

[0053] Step 1, this step is the existing method for preparing aminated macroporous silica,

[0054] Dissolve 0.5 g of cetylpyridinium bromide and 0.3 g of urea in 15 mL of deionized water, and then add dropwise the pre-mixed oil phase, namely 15 mL of cyclohexane, 0.55 mL of n-butanol and 1.25 g of n-butanol Ethyl silicate, stir at 500r / min at room temperature for 0.5h, then raise the temperature to 70°C and continue the reaction for 12h;

[0055] Wash with acetone and water three times in sequence, place at room temperature for 12 hours, and calcinate the silica at 550°C for 5 hours to obtain macroporous and diporous silica nanoparticles;

[0056] Ultrasonic disperse 0.2g of silica in 30mL of toluene, add dropwise 0.2mL of 3-aminotriethoxysilane, react at 80°C for 12h, and centrifuge to obtain aminated macroporous silica nanoparticles;

[0057] Step 2, ultrasonically disperse 0.4g of chitosan, 0.0234g of sodium chloride and 0.8g of acetic acid in 40mL of deionized water, sti...

Embodiment 2

[0061] Step 1, this step is the method after adjusting the existing method for preparing aminated macroporous silica,

[0062] Dissolve 0.5 g of cetylpyridinium bromide and 0.3 g of urea ultrasonically in 15 mL of deionized water, and the pre-mixed oil phase, namely, 15 mL of cyclohexane, 0.55 mL of n-butanol, and 1.25 g of n-Si Ethyl acetate was slowly added dropwise to the water phase, stirred at room temperature for 30 min at 500 r / min, then the temperature was raised to 70°C, and the reaction was continued at 150 r / min for 10 hours, and 25 μL of pre-mixed 3-aminotri Ethoxysilane and 2.5mL of cyclohexane, and continue to react for 2h;

[0063] The product was washed three times with acetone and water respectively, and placed at room temperature for 12 hours, and the obtained product was calcined at 550° C. for 5 hours to obtain aminated macroporous two-porous silica nanoparticles;

[0064] Step 2, ultrasonically disperse 0.4 g of chitosan, 0.0234 g of sodium chloride and 0...

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Abstract

The invention relates to a silicon dioxide loaded chitosan modified waterborne polyurethane acrylate composite emulsion, a preparation method therefor and an application of the composite emulsion. Themethod comprises the steps: (1) dispersing macroporous sillca nanoparticles in deionized water through ultrasonic dispersion, adding a chitosan solution, and carrying out uniform mixing; (2) carryingout filtering so as to obtain a filter cake, removing impurities from the filter cake, and then, carrying out drying, so as to obtain macroporous sillca loaded chitosan nanoparticles; and (3) dispersing the particles in deionized water through ultrasonic dispersion, adding the dispersion into a waterborne polyurethane acrylate emulsion, and carrying out uniform mixing, thereby obtaining the composite emulsion. According to the composite emulsion, chitosan can be released continuously to achieve a long-acting antibacterial effect, and the permeability to water vapor and antibacterial propertyof a film formed by waterborne polyurethane acrylate are improved; and when the composite emulsion serves as a leather finishing agent, the tensile strength, tear strength and permeability to water vapor of a leather sample can be increased by 6.25%, 6.67% and 197.42% separately, and an inhibition zone can reach 30mm.

Description

technical field [0001] The invention relates to the technical field of coating materials, in particular to a silica-loaded chitosan-modified waterborne polyurethane acrylate composite emulsion and a preparation method and application thereof. Background technique [0002] Macroporous SiO 2 Nanoparticles (MSN) have a special three-dimensional central radial large pore structure, which has the characteristics of high specific surface area, large volume, high pore permeability, and easier access to the inner surface of the particle. The load or transmission is carried out along the central radial channel. Due to SiO 2 The larger pores and pore volume of the nanoparticles, and the pores between them and the water-based polyurethane acrylate provide a certain channel for the permeation of water vapor. [0003] Chitosan (CS) is a natural polysaccharide produced by deacetylation of chitin, and it is also the most abundant polysaccharide on earth after cellulose. Chitosan has be...

Claims

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Application Information

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IPC IPC(8): C09D175/14C09D5/14C14C11/00
CPCC08K2201/011C09D5/14C09D175/14C14C11/006C08L5/08C08K7/26
Inventor 马建中刘晨艳闫凯
Owner SHAANXI UNIV OF SCI & TECH
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