Castor oil modified Pickering emulsion with stable cellulose and preparation method of castor oil modified Pickering emulsion

A technology of castor oil and cellulose, which is applied in the field of castor oil-modified cellulose-stabilized Pickering emulsion and its preparation field, can solve the problems of cumbersome modification process, harsh reaction conditions, and secondary pollution of the environment, and achieve low price, The reaction conditions are mild and the effect of reducing the preparation cost

Active Publication Date: 2017-11-21
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the modification process is cumbersome, the reaction conditions are harsh, and most of the grafted material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0015] Example 1

[0016] (1) Add 20g castor oil, 0.4g p-toluenesulfonic acid and 50mL toluene into a 250mL three-necked flask equipped with reflux condenser, water separator and thermometer, and heat to 120℃ to keep the water-containing toluene refluxed When the reflux of toluene stabilizes, add pyrithione carboxylic acid dropwise, wherein the molar ratio of -SH:-OH in the reaction raw material is 0.9:1, and stop the reaction when the water in the trap no longer increases after 3 hours of reaction. The above reaction solution was transferred to a separatory funnel and washed with water to remove unreacted pyrithione. Subsequently, dichloromethane was added to extract the reactant, and the lower layer solution was separated after standing to remove toluene and dichloromethane by vacuum distillation to obtain mercaptoated castor oil.

[0017] (2) Adjust the pH value of the aqueous nanocellulose dispersion to 8.5 with sodium hydroxide, and then add dopamine hydrochloride to modify i...

Example Embodiment

[0019] Example 2

[0020] (1) Add 15g castor oil, 0.4g p-toluenesulfonic acid and 50mL toluene into a 250mL three-necked flask equipped with reflux condenser, water separator and thermometer, and heat up to 110℃, so that toluene with water is continuously refluxed When the reflux of toluene stabilizes, add dropwise 2-mercapto-5-benzimidazole carboxylic acid, wherein the molar ratio of -SH:-OH in the reaction raw material is in the range of 1.5:1, and the water in the trap is no longer after 1h reaction Stop the reaction when it increases. The above reaction solution was transferred to a separatory funnel, and washed with water to remove unreacted 2-mercapto-5-benzimidazole carboxylic acid. Subsequently, dichloromethane was added to extract the reactant, and the lower layer solution was separated after standing to remove toluene and dichloromethane by vacuum distillation to obtain mercaptoated castor oil.

[0021] (2) Adjust the pH value of the nanocellulose aqueous dispersion to ...

Example Embodiment

[0023] Example 3

[0024] (1) Add 35g castor oil, 0.4g p-toluenesulfonic acid and 50mL toluene into a 250mL three-necked flask equipped with reflux condenser, water separator and thermometer, and heat to 150℃ to keep the water-containing toluene continuously refluxing ; When the reflux of toluene stabilizes, add dropwise 2-mercaptobenzothiazole carboxylic acid, where the molar ratio of -SH:-OH in the reaction raw materials is 1.2:1, and stop when the water in the trap no longer increases after 5 hours of reaction reaction. The above reaction solution was transferred to a separatory funnel, and washed with water to remove unreacted 2-mercaptobenzothiazole carboxylic acid. Subsequently, dichloromethane was added to extract the reactant, and the lower layer solution was separated after standing to remove toluene and dichloromethane by vacuum distillation to obtain mercaptoated castor oil.

[0025] (2) Adjust the pH value of the nanocellulose aqueous dispersion to 8.5 with sodium hyd...

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PUM

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Abstract

The invention relates to castor oil modified Pickering emulsion with stable cellulose and a preparation method of the castor oil modified Pickering emulsion. The preparation method of the castor oil modified Pickering emulsion comprises the following steps: carrying out esterification reaction on castor oil and a mercaptan carboxylic acids compound to prepare thiolated castor oil; adding dopamine hydrochloride in nano-cellulose aqueous dispersion under the condition of alkalescence to modify the nano-crystalline cellulose aqueous dispersion so as to obtain polydopamine modified nano-cellulose acetone dispersion; then adding the thiolated castor oil in the dispersion to obtain black brown castor oil modified nano-cellulose powder; dispersing the castor oil modified nano-cellulose powder in deionized water to form uniform castor oil modified cellulose aqueous dispersion; and then uniformly mixing the uniform castor oil modified cellulose aqueous dispersion with an oil phase to obtain the milky castor oil modified Pickering emulsion with stable cellulose. The prepared Pickering emulsion is stable in performance and long in storage life, and is expected to be used in the fields of cosmetics, medicines, petroleum, waste water treatment and the like.

Description

Technical field: [0001] The invention belongs to the field of biomass materials and applications, in particular to a castor oil modified cellulose-stabilized Pickering emulsion and a preparation method thereof. technical background: [0002] Pickering emulsion is a new type of emulsion that replaces traditional surfactants with solid particles to stabilize two incompatible liquids. It is mainly divided into water-in-oil (W / O) and oil-in-water (O / W) emulsions. Compared with emulsions stabilized by traditional surfactants, Pickering emulsions use less emulsifiers and are more stable. The stabilization mechanism is that the steric hindrance effect between the emulsion droplets formed by the irreversible adsorption of solid particles at the oil-water interface hinders the coalescence of the droplets, and at the same time, the network structure formed by the entanglement of solid particles increases the emulsion to a certain extent. stability. Due to the excellent characteristi...

Claims

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Application Information

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IPC IPC(8): C08G81/00C08B15/06C08G73/06C08J3/03C08L87/00
CPCC08B15/06C08G73/0672C08G81/00C08J3/03C08J2387/00
Inventor 尚倩倩周永红胡立红刘承果杨晓慧胡云
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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