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Nano cellulose containing cinnamyl functional group and preparation method and application of nano cellulose

A nano-cellulose and functional-based technology, which can be used in skin care preparations, pharmaceutical formulations, cosmetic preparations, etc., can solve the problems of mixing nano-cellulose and hydrophobic matrix materials, and achieve excellent UV absorption performance, moisturizing The effect of increasing wetness and improving dispersibility

Inactive Publication Date: 2017-10-17
张振
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In general, nanocellulose and hydrophilic matrix materials have good miscibility (Chinese patent CN104404647 B), and can be used as a reinforcing agent for hydrophilic matrix materials, but the mixing of nanocellulose and hydrophobic matrix materials Relatively poor

Method used

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  • Nano cellulose containing cinnamyl functional group and preparation method and application of nano cellulose
  • Nano cellulose containing cinnamyl functional group and preparation method and application of nano cellulose
  • Nano cellulose containing cinnamyl functional group and preparation method and application of nano cellulose

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] The schematic diagram of introducing cinnamyl functional groups on cellulose nanocrystals by acylation method is as follows figure 1 shown.

[0063] 1 gram of nanocellulose is dispersed into water by ultrasonic method, and the mass fraction of nanocellulose is 1% dispersion liquid A; in dispersion liquid A, add 1 gram of 4-dimethylaminopyridine, 1 gram of triethylamine and 0.5 g of cinnamoyl chloride was used to obtain a mixed solution B; the above mixed solution B was reacted at 25° C. for 24 hours, washed with acetone for 3 times, and nanocellulose containing cinnamyl functional groups could be obtained.

[0064] The Fourier transform infrared spectrum of the cellulose nanocrystals containing cinnamyl functional groups prepared by this method is as follows: figure 2 As shown, compared with nanocellulose, the characteristic peak of cinnamyl functional group appeared in the infrared spectrum of nanocellulose containing cinnamyl functional group, such as at 1718cm -1 ...

Embodiment 2

[0068] The steps of introducing cinnamyl functional groups on cellulose nanocrystals by esterification are as follows:

[0069] Disperse 1.3 g of cellulose nanocrystals into 100 ml of water, add 20 mg of 2,2,6,6-tetramethylpiperidine-1-oxide and 400 mg of sodium bromide, stir for 30 minutes, add sodium hydroxide solution Regulate the pH value of reaction solution to be 10, then add 8 grams of mass fraction and be 13% sodium hypochlorite solution; Continue to add sodium hydroxide in reaction solution to keep the pH of reaction solution at more than 9, when the pH of reaction solution is basically stable For this purpose, at the end of the TEMPO oxidation reaction, add 10 ml of methanol, then adjust the pH of the reaction solution to be neutral with hydrochloric acid, and obtain cellulose nanocrystals oxidized by TEMPO after dialysis for 7 days; cellulose nanocrystals oxidized by TEMPO and cellulose nanocrystals oxidized by TEMPO Infrared spectrum such as Figure 5 As shown, co...

Embodiment 3

[0072] The steps of introducing polyhydroxycinnamic acid methacrylate on the nanocellulose by in situ initiating free radical polymerization on the nanocellulose are as follows:

[0073] Firstly, the monomer hydroxycinnamate methacrylate is prepared by the acylation reaction of hydroxyethylmethacrylate (2-Hydroxyethylmethacrylate, abbreviated as HEMA) and cinnamoyl chloride.

[0074] 1 g of hydroxyethyl methacrylate and 2 g of cinnamoyl chloride were reacted in a mixture of 100 ml of dichloromethane and 20 ml of triethylamine at room temperature for 24 hours.

[0075] The reaction product is purified by silica gel chromatography to finally obtain the monomer hydroxycinnamate methacrylate (CEM). CEM in deuterated chloroform1 The H NMR spectrum is: 1 H NMR (400MHz, CDCl3): δ1.89 (3H, t, CH3); 4.37 (4H, m, -O-CH2-CH2-); 5.53 (1H, quin, =CH), 6.08 (1H, quin, =CH), 6.39(1H, d, =CH-Ar), 7.64(1H, d, =CH-CO-), 7.3~7.5(5H, m, ArH), such as Figure 7 shown.

[0076] Disperse 1 gram ...

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Abstract

The invention discloses nano cellulose containing a cinnamyl functional group and a preparation method and application of the nano cellulose and relates to the technical field of modified preparation and application of the nano cellulose. According to the preparation method, the nano cellulose is prepared through introducing the cinnamyl functional group to the nano cellulose; the cinnamyl functional group introduced to the nano cellulose is a micromolecule or a polymer of the cinnamyl functional group. According to the nano cellulose containing the cinnamyl functional group, excellent properties of the nano cellulose, such as excellent mechanical property, large specific surface area and good biocompatibility, are still kept; and meanwhile, the dispersity of the nano cellulose in an organic solvent and a hydrophobic material is improved. In addition, the nano cellulose containing the cinnamyl functional group has excellent ultraviolet absorption performance, and the nano cellulose containing the cinnamyl functional group is subjected to cross-linking reaction under ultraviolet radiation. The nano cellulose containing the cinnamyl functional group has a wide application prospect.

Description

technical field [0001] The invention relates to the technical field of modification preparation and application of nanocellulose, in particular to a preparation method and application of nanocellulose containing cinnamyl functional groups. Background technique [0002] There are many compounds containing cinnamyl functional groups in nature, such as cinnamic acid, methyl cinnamate and ethyl cinnamate. These compounds are widely found in many plants, such as cinnamon, strawberries and peppers. These compounds can come into direct contact with the skin or be eaten. Because of its fruity, sweet and pleasant smell, it is widely used in industrial fields such as spices, perfumes and pharmaceuticals (Chinese patent CN106083561 A and Chinese patent CN102166257 A). In addition, the cinnamyl functional group has a strong UV absorption (Chinese patent CN 102946848 A), Octylmethoxycinnamate (Octylmethoxycinnamate) is 15 chemical sunscreen active ingredients approved by the U.S. Food ...

Claims

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Application Information

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IPC IPC(8): C08B3/10C08B3/14C08F251/02C08F222/14C08F220/40A61K8/73A61Q17/04A61K8/81
CPCC08B3/10A61K8/731A61K8/8152A61Q17/04C08B3/14C08F251/02C08F2438/01
Inventor 张振史少伟刘大鹏张赛乔玉萍李东明张颜陆荣郑张妞
Owner 张振
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