A light-converting agricultural film and its preparation method and application

Abstract

The invention belongs to the field of agricultural light-light conversion functional materials, and discloses a light conversion agricultural film using nitride red phosphor as a light conversion agent, and a making method and an application thereof. The light conversion agricultural film mainly comprises a light conversion agent master batch, and the light conversion agent master batch comprises, by mass, 10-50% of the nitride red light conversion agent, 1-10% of an assistant, and the balance of a master batch matrix. The nitride light conversion agent well matches with spectra required by plant photosynthesis, has excellent red long afterglow luminescence performance through trivalent rare earth ion co-doping and cation replacement, and can provide red orange light required by plant photosynthesis for a long time under night or sunless conditions to prolong the plant photosynthesis. The nitride light conversion agent is processed to form the master batch, and the master batch is used to make the agricultural film, so the light conversion agent is pre-dispersed, thereby the dispersion of the nitride light conversion agent in the film matrix is improved, and yield increase and quality improvement effects are reached when the agricultural film is applied in the agriculture field.

Description

technical field [0001] The invention belongs to the field of agricultural light-light conversion functional materials, in particular to a light-converting agricultural film and its preparation method and application. Background technique [0002] Agricultural rare earth luminescent-light-changing materials are also called agricultural light-changing agents. When the agricultural light-changing agent is processed into a light-changing agricultural film and used for planting crops, it can convert the useless or harmful part of the sunlight into the light that plants need to absorb; in addition, the light-changing agent with obvious afterglow effect, Under natural conditions, when the light supply is insufficient, the photosynthesis of plants in the greenhouse can still be carried out efficiently. Therefore, as a high-tech agricultural light-supplementing material that can effectively increase the yield of greenhouse crops, agricultural light-changing agents and light-changing...

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Problems solved by technology

[0004] So far, although some progress has been made, there are still many problems in the key material light-changing agent that can be used to process light-converting agricultural film and can better promote the growth of crops: (1) containing trivalent europium ions (Eu 3+ ) organic ligand rare earth light conversion agent, which can absorb 240-420nm ultraviolet light and emit 580-630nm red-orange light. Absorbs ultraviolet light and has a narrow emission spectrum, poor matching with the absorption wavelength of plants, easy photolysis under sunlight, and high cost; (2) Anthraquinone, pyrazine or acridine fluorescent dyes have the advantages of not only Absorbs ultraviolet light and absorbs yellow-green light, but its emission spectrum has poor matching with plant absorption wavelength, high cost, and short fluorescence lifetime and fast decay of intensity; (3) containing europium (Eu 2+ ) Inorganic rare earth light conversion agent of alkaline earth metal sulfide, which can absorb red-orange light emitted by 280-400nm ultraviolet light in natural light, or absorb ultraviolet light and yellow-green light at the same time, emit blue-violet light, red-orange light, and it has Wide emission band, the emission spectrum is relatively consistent with the spectrum required for plant photosynthesis and the light conversion intensity decays slowly, but its initial brightness is not as good as that of organic rare earth light conversion agents, and it is easy to deliquescence in the air and easy to oxidize under light

However, the existing patents and related literatures have not used this type of nitride red phosphor as a light conversion agent for agricultural film.

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