Biodegradable ultraviolet-blocking weather-proof micro-nano composite material and application thereof

A technology of biodegradation and composite materials, which is applied in the field of preparation of micro-nano composite materials, can solve the problems of limited compatibility of ultraviolet light blocking ability of inorganic ultraviolet shielding agents, and achieve good market prospects, simple preparation process and strong practicability

Active Publication Date: 2019-06-07
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, inorganic UV shielding agents have limited UV blocking ability and compatibility with polymer systems, and often catalyze the degradation of the polymer matrix

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A biodegradable UV-blocking and weather-resistant micro-nano composite material, the specific preparation process is as follows:

[0021] (1) The alkali lignin of 5 mass parts is dissolved in the mixed solvent that the water of 990 mass parts and acetone are formed by volume ratio 20:100, the lignin organic solvent of gained is mixed with the deionized water of 5000 mass parts, stirs to obtain Alkali lignin micro-nano particle suspension;

[0022] (2) Add 5 parts by mass of dopamine monomer to the suspension in step (1), the dopamine monomer spontaneously oxidizes at 25°C and the pH value is 8, and after 1 hour of reaction, lignin micro-nano particles surface generates Polydopamine shell layer, separated and purified to obtain core-shell type modified bio-based micro-nano particles; wherein the thickness of the polydopamine shell layer is 3nm, the core is alkali lignin micro-nano particles, and the diameter of the core-shell structure particle is 30nm ;

[0023] (3) T...

Embodiment 2

[0026] A biodegradable UV-blocking and weather-resistant micro-nano composite material, the specific preparation process is as follows:

[0027] (1) Dissolve 80 parts by mass of enzymatic lignin in a mixed solvent composed of 200 parts by mass of water and acetone at a volume ratio of 25:100, mix the resulting lignin solution with 600 parts by mass of deionized water, and stir to obtain Enzymatic hydrolysis of lignin micro-nano particle suspension;

[0028] (2) Add 26 parts by mass of dopamine monomer to the suspension in step (1), the dopamine monomer spontaneously oxidizes at 80°C and the pH value is 12, and after 47 hours of reaction, lignin micro-nano particles are formed on the surface The polydopamine shell layer is separated and purified to obtain core-shell modified bio-based micro-nano particles; the thickness of the polydopamine shell layer is 55nm, the core is enzymatic lignin micro-nano particles, and the diameter of the core-shell structure particles is 500nm;

...

Embodiment 3

[0032] A biodegradable UV-blocking and weather-resistant micro-nano composite material, the specific preparation process is as follows:

[0033] (1) Dissolve 55 parts by mass of halogenated lignin in a mixed solvent composed of 70 parts by mass of water and acetone at a volume ratio of 39:100, mix the resulting lignin solution with 8500 parts by mass of deionized water, and stir to obtain halogenated lignin. Lignin micro-nano particle suspension;

[0034] (2) Add 89 parts by mass of dopamine monomer to the suspension in step (1), the dopamine monomer spontaneously oxidizes at 37° C. and the pH value is 7.2, and after 70 hours of reaction, the lignin micro-nano particle surface generates Polydopamine shell layer, separated and purified to obtain core-shell type modified bio-based micro-nano particles; wherein the thickness of the polydopamine shell layer is 25nm, the core is halogenated lignin micro-nano particles, and the diameter of the core-shell structure particle is 210nm ...

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Abstract

The invention discloses a biodegradable ultraviolet-blocking weather-proof micro-nano composite material and an application thereof. The material is obtained by carrying out melt blending on 1-100 parts by mass of micro-nano particles with a core-shell structure and 50-10000 parts by mass of a biodegradable polymer matrix at a temperature of 100-250 DEG C for 5-40 minutes, and can be used as various thin films, sheet materials or board materials with ultraviolet protection and weather resistance. The contained micro-nano particles are a core-shell modified bio-based material, wherein the shellmainly comprises a dopamine polymer, and the core is lignin. The mechanical property of the micro-nano particles can be effectively improved by regulating and controlling morphology and material composition of the shell layer, ultraviolet blocking performance and weather-proof stability of the micro-nano particles is improved, and compatibility of the micro-nano particles with the polymer matrixis improved. The coating disclosed by the invention has good ultraviolet blocking property and weather resistance and is economic and environmentally friendly, operation is simple, and a wide application prospect is achieved in the aspect of ultraviolet protection and weather-proof polymer material preparation.

Description

technical field [0001] The invention belongs to the technical field of micro-nano composite material preparation, and relates to a biodegradable ultraviolet-blocking and weather-resistant micro-nano composite material and its application. Background technique [0002] With the rapid development of economy and society, the widespread use of polymer materials, especially plastic films, sheets and plates, has brought great convenience to people's lives. Most of the polymer materials currently used, such as polyethylene, polypropylene, polyvinyl chloride and polystyrene, are used as food packaging, stationery, tableware, craft electromechanical packaging and other products, involving all aspects of our lives. However, these polymers are generally chemically stable and difficult to degrade. Their use, especially in the agricultural and packaging industries that mostly use disposable consumer products, has caused serious white pollution. In agriculture, packaging and medical indu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L97/00C08L79/04C08J5/18
Inventor 王文俊邢乾秋刘平伟吴林波
Owner ZHEJIANG UNIV
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