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A kind of red light conversion film and its preparation method and application

A light conversion film and red phosphor technology, which is applied in the field of agricultural light conversion, can solve the problems of no light conversion effect and environmental threats, and achieve the effects of abundant reserves, avoiding environmental problems, and increasing optical performance

Active Publication Date: 2017-05-24
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the use of polyethylene film is not only a major challenge to existing energy sources, but also a huge threat to the environment
Moreover, the function of ordinary agricultural film is limited to increasing the surface temperature and ensuring the humidity of the soil, and has no effect of turning light

Method used

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  • A kind of red light conversion film and its preparation method and application
  • A kind of red light conversion film and its preparation method and application
  • A kind of red light conversion film and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The preparation method of red light conversion film can be divided into three stages: cellulose dissolution, composite process and curing film formation:

[0049] Precool 100 g of the combined aqueous solution containing 7wt% NaOH / 12wt% urea to -12°C to -13°C, add a certain amount of cotton paddle (purchased from Hubei Chemical Fiber Group Co., Ltd., DP=580), and stir rapidly to obtain 4wt% % cellulose solution. Then take 0.10g of Sr 2 Si 5 N 8 :Eu 2+ (light transfer agent Sr 2 Si 5 N 8 :Eu 2+ Excitation and emission spectra, see figure 1 ; light transfer agent Sr 2 Si 5 N 8 :Eu 2 + SEM, see figure 2 ) into the above solution, continue to stir for 30min to make it uniformly dispersed, remove air bubbles through a high-speed centrifuge to obtain a composite solution (the mass ratio of the light converting agent to cellulose in the composite solution is 1:40). After casting the composite solution on a glass plate to form a film, it was immediately immersed...

Embodiment 2

[0051] Distill 100g of 50wt% N-methylmorpholine-N-oxide aqueous solution at 85°C under reduced pressure until the water content drops to about 13.3wt%, then add 3g of cotton pulp and stir for a while to obtain a transparent , light brown cellulose / NMMO solution (wherein the final concentration of cellulose is 5.2 wt%). Then add 0.2g of Sr 2 Si 5 N 8 :Eu 2+ , and continued to stir for 30 minutes to uniformly disperse it in the cellulose mixed solution, remove air bubbles, and obtain a composite solution (the mass ratio of light-transforming agent to cellulose in the composite solution is 1:15). Cast the composite solution on a hot glass plate to form a film, let it solidify and form, wash with distilled water, spread it flat on a glass plate and dry it naturally to obtain a red light-converting film.

Embodiment 3

[0053] Precool 100 g of a combined aqueous solution containing 7wt% NaOH / 12wt% urea to -12°C to -13°C, add a certain amount of cotton paddle, and stir rapidly to obtain a 4wt% cellulose solution. Then add 0.20g of CaAl 12 o 19 :Mn 4+ , and continue to stir for 30 minutes to make it uniformly dispersed in the cellulose solution, remove air bubbles by a high-speed centrifuge, and obtain a composite solution (the mass ratio of light-transforming agent and cellulose in the composite solution is 1:20). After casting the composite solution on a glass plate to form a film, it was immediately immersed in 5 wt% H 2 SO 4 It was solidified and formed in the solution, and after 2 minutes, it was taken out and washed, and spread on a glass plate to dry naturally to obtain a red light-converting film. The excitation and emission spectra of the obtained light conversion film are as follows: image 3 Shown (obtained by testing with the fluorescence spectrometer F-7000 of Tianmei (China) ...

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Abstract

The invention discloses a novel red light conversion film and a preparation method and an application thereof. The novel red light conversion film comprises a light conversion agent and a carrier; a red fluorescent powder is selected and used as the light conversion agent, and cellulose is selected and used as the carrier; the cellulose is a most abundant natural polymer on the earth and has the advantages of being safe, non-toxic and renewable, and a synthetic material of the cellulose not only has excellent mechanical properties but also is biodegradable. The novel red light conversion film is an important change to a conventional agricultural polymer material thin film; the natural polymer and the light conversion agent are combined, conventional renewable green resources are fully utilized, environmental problems brought by synthetic polymer is avoided, and optical properties are increased based on the traditional thin film. The light conversion film has high-efficiency stimulation at the wavelength of 200-600 nm, and can convert ultraviolet light and a part of visible light into red light useful for plant growth so as to improve the utilization rate of light energy; and the light conversion film can be used as agricultural greenhouse films and plastic films and is applied in crop cultivation, seedling growing and other aspects.

Description

technical field [0001] The invention belongs to the technical field of agricultural light conversion, and in particular relates to a red light conversion film and its preparation method and application. Background technique [0002] With the continuous advancement of social knowledge, scientific and technological informationization and economic globalization, the sustainable development strategy is particularly important and prominent. However, it is currently facing two major problems of resource scarcity and environmental pollution, which makes the use of existing green and environmental protection resources of far-reaching significance. Cellulose is the most abundant natural polymer on the earth, and it is an inexhaustible and inexhaustible renewable resource in nature. Compared with synthetic polymers, cellulose also has the advantages of being completely biodegradable, non-toxic, non-polluting, easy to modify, and good biocompatibility, and is considered to be the main...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L1/02C08K3/28C08K3/22C08K3/16C08K3/34C08J5/18A01G9/14
CPCY02A40/25
Inventor 刘应亮游雅琴雷炳富肖勇郑明涛董汉武张浩然
Owner SOUTH CHINA AGRI UNIV
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