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Novel red light conversion film and preparation method and application thereof

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

Active Publication Date: 2015-08-19
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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  • Novel red light conversion film and preparation method and application thereof
  • Novel red light conversion film and preparation method and application thereof
  • Novel red light conversion film and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0049] Pre-cool 100 g of a combined aqueous solution containing 7wt% NaOH / 12wt% urea to -12°C~-13°C, add a certain amount of cotton paddle (purchased from Hubei Chemical Fiber Group Co., Ltd., DP=580), and stir quickly to obtain 4wt % Cellulose solution. Then take 0.10g of Sr 2 Si 5 N 8 :Eu 2+ (Light conversion agent Sr 2 Si 5 N 8 :Eu 2+ Excitation and emission spectra, see figure 1 ;Light conversion agent Sr 2 Si 5 N 8 :Eu 2+ SEM, see figure 2 ) Was added to the above solution, continued to stir for 30 minutes to make it uniformly dispersed, and the bubbles were removed by a high-speed centrifuge to obtain a composite solution (the mass ratio of the light conversion agent to the cellulose in the composite solution was 1:40). After casting the composite solution on the glass plate to form a film, immediately imme...

Embodiment 2

[0051] 100g of 50wt% N-methylmorpholine-N-oxide aqueous solution was distilled under reduced pressure at 85°C until the water content dropped to about 13.3wt%, then 3g cotton pulp was added and stirred for a period of time to obtain a transparent , Light brown cellulose / NMMO solution (where the final concentration of cellulose is 5.2 wt%). Then add 0.2g of Sr 2 Si 5 N 8 :Eu 2+ , Continue to stir for 30 minutes to make it uniformly dispersed in the cellulose mixed solution, remove bubbles, and obtain a composite solution (the mass ratio of the light conversion agent to the cellulose in the composite solution is 1:15). After the composite solution is cast on a hot glass plate to form a film, it is cured and formed, washed with distilled water, and then laid flat on the glass plate to dry naturally to obtain a new red light-converting film.

Embodiment 3

[0053] 100 g of a combined aqueous solution containing 7 wt% NaOH / 12 wt% urea is pre-cooled to -12°C to -13°C, a certain amount of cotton paddle is added, and the mixture is stirred rapidly to obtain a 4 wt% cellulose solution. Then add 0.20g of CaAl 12 O 19 :Mn 4+ , Continue to stir for 30 minutes to make it uniformly dispersed in the cellulose solution, and remove the bubbles by a high-speed centrifuge to obtain a composite solution (the mass ratio of the light conversion agent to the cellulose in the composite solution is 1:20). After casting the composite solution on the glass plate to form a film, immediately immerse it into 5wt% H 2 SO 4 It is solidified in the solution and formed, after 2 minutes, it is taken out and washed, and it is laid flat on a glass plate and dried naturally to obtain a new type of red light conversion film. The excitation and emission spectra of the obtained light conversion film are as follows image 3 Shown (measured with a fluorescence spectrome...

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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 specifically relates to a novel red light conversion film and a preparation method and application thereof. Background technique [0002] With the continuous advancement of social knowledge, science and technology information and economic globalization, sustainable development strategies have become particularly important and prominent. However, it is currently facing two major problems: resource scarcity and environmental pollution, which makes the use of existing green 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 and non-polluting, easy to modify, and good biocompatibility. It is considered to be the main raw...

Claims

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Application Information

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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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