A kind of in-situ titanium dioxide coated lignin composite particle and its preparation and application

A technology of titanium dioxide and composite particles, applied in the field of fine chemicals, can solve the problems of free radical damage, unfavorable engineering application, inability to compound, etc., to improve the problem of easy agglomeration, improve the effect of ultraviolet protection, and improve the effect of application.

Active Publication Date: 2022-02-15
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although lignin has a certain UV protection ability, due to its dark color and easy aggregation, it is difficult to directly add it to sunscreen products as a UV protection agent, and it needs to be modified or compounded.
TiO 2 It has extremely high whiteness, but it also has strong photocatalytic activity, which will generate free radicals and cause harm to the human body, so it cannot be simply compounded with lignin as a sunscreen
Li et al. modified lignin by quaternization, dissolved it to make it acidic, and mixed it with anionic surfactant to obtain a surfactant compound, which was further combined with TiO 2 Self-assembly in ethanol / water yielded TiO 2 / Lignin-based composite nanoparticles, but lignin is used as a coating layer, the color is darker, and the preparation process of composite particles is cumbersome, which is not conducive to engineering applications (ACSSustainable Chem.Eng.2019, 7, 6, 6234–6242)

Method used

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  • A kind of in-situ titanium dioxide coated lignin composite particle and its preparation and application
  • A kind of in-situ titanium dioxide coated lignin composite particle and its preparation and application
  • A kind of in-situ titanium dioxide coated lignin composite particle and its preparation and application

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Experimental program
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Effect test

Embodiment 1

[0047] Dissolve 1 g of alkali lignin (AL) in 100 mL of acetone / water mixture (volume ratio: acetone: water = 8:1), stir while adding 400 mL of deionized water; after the addition is complete, rotate the mixture at 45°C, Concentrated and then freeze-dried to obtain lignin colloidal spheres (ALS). Disperse 0.5g of ALS in 250mL of absolute ethanol, sonicate for 30min to disperse evenly, add 4mg of TBOT dropwise within 1.5min under stirring, and record it as dispersion A. Another 250 mL of absolute ethanol was added to 2 mg of concentrated hydrochloric acid (mass fraction: 38%) to form solution B. Use a peristaltic pump to slowly drop solution B into the vigorously stirred dispersion A, and the dropping rate is controlled at 0.8 mL / min. After solution B is added dropwise, continue to stir for 12h to make TiO 2 Fully covered. Afterwards, the dispersion was centrifuged (10000r / min, 30min) and washed three times with absolute ethanol to obtain the product, which was dried in an ov...

Embodiment 2

[0056] Dissolve 1 g of alkali lignin (AL) in 100 mL of acetone / water mixture (volume ratio: acetone: water = 8:1), stir while adding 400 mL of deionized water; after the addition is complete, rotate the mixture at 45°C, Concentrated and then freeze-dried to obtain lignin colloidal spheres (ALS). Disperse 0.5g of ALS in 250mL of absolute ethanol, sonicate for 30min to disperse evenly, add 2mg of TBOT dropwise within 1.5min under stirring, and record it as dispersion A. Another 250 mL of absolute ethanol was added to 2 mg of concentrated hydrochloric acid (mass fraction: 38%) to form solution B. Use a peristaltic pump to slowly drop solution B into the vigorously stirred dispersion A, and the dropping rate is controlled at 0.8 mL / min. After solution B is added dropwise, continue to stir for 12h to make TiO 2 Fully covered. Afterwards, the dispersion was centrifuged (10000r / min, 30min) and washed three times with absolute ethanol to obtain the product, and dried in an oven at ...

Embodiment 3

[0059]Dissolve 1 g of alkali lignin (AL) in 100 mL of acetone / water mixture (volume ratio: acetone: water = 8:1), stir while adding 400 mL of deionized water; Concentrated and then freeze-dried to obtain lignin colloidal spheres (ALS). Disperse 0.5g of ALS in 250mL of absolute ethanol, ultrasonically treat for 30min to disperse evenly, add 6mg of TBOT dropwise under stirring, and record it as dispersion A. Another 250 mL of absolute ethanol was added to 2 mg of concentrated hydrochloric acid (mass fraction: 38%) to form solution B. Use a peristaltic pump to slowly drop solution B into the vigorously stirred dispersion A, and the dropping rate is controlled at 0.8 mL / min. After solution B is added dropwise, continue to stir for 12h to make TiO 2 Fully covered. Afterwards, the dispersion was centrifuged (10000r / min, 30min) and washed three times with absolute ethanol to obtain the product, and dried in an oven at 100°C for 12h to obtain TiO 2 / Lignin ball-based composite ma...

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Abstract

The invention discloses an in-situ titanium dioxide-coated lignin composite particle and its preparation and application. In the present invention, the three-dimensional network amorphous lignin is self-assembled to obtain stable lignin colloidal balls with a certain size, and then the hydrolysis rate of tetrabutyl titanate is controlled by adding an inhibitor, so that tetrabutyl titanate is dissolved in lignin A titanium dioxide coating layer without photocatalytic activity is formed on the colloidal spheres, and the obtained titanium dioxide-coated lignin composite particles have better ultraviolet protection effect. The preparation process of the present invention is green and efficient, promotes the application of natural polymer lignin in the field of daily chemicals, and simultaneously solves the problems of dark lignin color, easy agglomeration, photocatalytic activity of physical sunscreens, etc., and has broad application prospects.

Description

technical field [0001] The invention belongs to the field of fine chemicals, and specifically relates to an in-situ titanium dioxide-coated lignin composite particle and its preparation and application. Background technique [0002] With the destruction of the ozone layer, ultraviolet radiation is becoming more and more serious. Long-term exposure to ultraviolet radiation will cause many potential harmful effects on human skin cells, mucous membranes and hair. Ultraviolet radiation can be divided into three categories. UVC radiation (200-280nm) is completely absorbed by ozone and oxygen molecules in the atmosphere due to its high energy and does not reach the ground; UVB radiation (290-320nm) accounts for about 4-4% of the total radiation. 5%, can penetrate the stratum corneum and epidermis, long-term or excessive exposure will cause melanin deposition in the basal layer and redness, swelling and peeling of the epidermis; UVA radiation (320-400nm) has the strongest penetrati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61K8/72A61K8/27A61K8/11A61Q17/04
CPCA61K8/72A61K8/27A61K8/11A61Q17/04A61K2800/621
Inventor 钱勇王显华邱学青杨东杰楼宏铭欧阳新平
Owner SOUTH CHINA UNIV OF TECH
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