Aminoized hydroxyapatite/chitosan composite aerogel as well as preparation method and application thereof

A technology of aminated hydroxyapatite and composite airgel, which is applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., and can solve the problem of interfacial compatibility and uniformity affecting airgel thermal insulation performance and mechanical strength , low chemical stability and mechanical strength, composite airgel brittleness and poor thermal stability, etc., to improve mechanical strength and chemical stability, avoid agglomeration and agglomeration, and improve interface affinity

Inactive Publication Date: 2019-06-21
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, Chinese invention patent application 201711084945.6 provides a preparation of ultra-long hydroxyapatite nanowire airgel, which has good thermal insulation performance, and its thermal conductivity is 0.0387W / m·K, which shows that Hydroxyapatite can construct a three-dimensional porous aerogel and apply it in thermal insulation, energy saving and emission reduction, and can effectively solve the shortcomings of composite aerogels such as brittleness and poor thermal stability.
[0005] At present, most biomass-inorganic composite aerogels use physical composite methods to uniformly mix natural polymers and inorganic reinforcement phases. The interfacial compatibility and uniformity will affect the thermal insulation performance and mechanical strength of aerogels. The prepared airgel has the disadvantages of low chemical stability and low mechanical strength

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  • Aminoized hydroxyapatite/chitosan composite aerogel as well as preparation method and application thereof
  • Aminoized hydroxyapatite/chitosan composite aerogel as well as preparation method and application thereof
  • Aminoized hydroxyapatite/chitosan composite aerogel as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0038] Get 4.5g of anhydrous calcium chloride (CaCl 2 ) into 500mL distilled water and stir evenly, and adjust the pH value of the solution to 11 with 1mol / L NaOH, then take 8.71g sodium dihydrogen phosphate solution (NaH 2 PO 4) was dissolved in 200mL distilled water, and stirred evenly. The sodium dihydrogen phosphate solution is slowly added dropwise to the calcium nitrate solution, and its molar ratio is Ca / P=1.67. At the same time, the pH value was adjusted to 11 with 1mol / L NaOH. After the dropwise addition was completed, the above mixture was transferred to a water bath at a temperature of 70° C. and stirred for 12 h. After the stirring was completed, the supernatant liquid was poured off by standing for stratification, washed repeatedly with distilled water and ethanol several times, the precipitated product was collected by filtration, dried at 60°C for 12 hours, and sieved with a size of 100 mesh to obtain hydroxyapatite. The scanning electron microscope image of...

Embodiment 2

[0041] 11.81g calcium nitrate [Ca(NO 3 ) 2 4H 2 O] was added to 500mL distilled water and stirred evenly, and the pH value of the solution was adjusted to 10 with ammonia water, then at a temperature of 30°C and a stirring speed of 1000rpm, 3.45g of ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ) was dissolved in 200mL distilled water, and stirred evenly. The ammonium dihydrogen phosphate solution is slowly added dropwise to the calcium nitrate solution, and its molar ratio is Ca / P=1.67. At the same time, the pH value was adjusted to 10 with ammonia water. After the dropwise addition was completed, the above mixture was transferred to a water bath at a temperature of 30° C. and stirred for 18 h. After the stirring was completed, the supernatant was poured off by standing for stratification, washed repeatedly with distilled water and ethanol several times, the precipitated product was collected by filtration, dried at 60°C for 12 hours, and sieved with a size of 200 mesh t...

Embodiment 3

[0044] Get 4.5g of anhydrous calcium chloride (CaCl 2 ) was added to 500mL distilled water and stirred evenly, and the pH value of the solution was adjusted to 12 with 1mol / L NaOH, and then 2.48g sodium metaphosphate [(NaPO 3 ) 6 ] was dissolved in 200mL distilled water and stirred evenly. Sodium metaphosphate [(NaPO 3 ) 6 ] The solution is slowly added dropwise to the calcium chloride solution, and its molar ratio is Ca / P=1.67. At the same time, the pH value was maintained at 12 with 1mol / L NaOH. After the dropwise addition was completed, the above mixture was transferred to a water bath at a temperature of 50° C. and stirred for 6 h. After the stirring was completed, the supernatant liquid was poured off by standing for stratification, washed repeatedly with distilled water and ethanol several times, the precipitated product was collected by filtration, dried at 60°C for 12 hours, and sieved with a size of 300 mesh to obtain hydroxyapatite. The X-ray pattern of hydroxy...

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Abstract

The invention provides aminoized hydroxyapatite/chitosan composite aerogel as well as a preparation method and application thereof. The preparation method comprises the following steps: preparing hydroxyapatite by a liquid phase coprecipitation method, taking the hydroxyapatite as a high-thermal-stability and high-toughness inorganic reinforced phase, modifying the hydroxyapatite by a silane coupling agent, improving the affinity of a nano-crystal structure interface, uniformly mixing a chitosan solution, and preparing the aminoized hydroxyapatite/chitosan composite aerogel by a Schiff base chemical crosslinking and directional prefreezing-freeze drying technology. The composite aerogel has excellent properties of low volume density, high porosity, high mechanical strength and low heat-conducting coefficiency, and is a green, low-cost, novel and heat-insulating composite aerogel material.

Description

technical field [0001] The invention relates to the field of composite airgel and its preparation, in particular to an aminolated hydroxyapatite / chitosan composite airgel and its preparation method and application. Background technique [0002] Airgel is a class of three-dimensional porous materials with low density, high porosity, and high specific surface area. It has important applications in the fields of catalyst support, energy storage, oil-water separation, and high-efficiency heat insulation. Airgel can be divided into inorganic aerogel, organic aerogel and inorganic / organic composite aerogel according to different components. The most common airgel is silica airgel, SiO 2 Aerogel has always been a research hotspot of airgel materials due to its easily regulated porosity and extremely low thermal insulation stability, but pure silica airgel materials have poor flexibility and poor mechanical properties, which limit Wide application of silica airgel materials. With...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08J3/075C08L5/08C08K9/06C08K3/32C01B25/32
Inventor 蒋崇文朱俊东谢华生胡江胡熠暹王哲轩刘有才
Owner CENT SOUTH UNIV
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