Application status and development trend of the ho

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Application status and development trend of plastic film additives (III)

dripping agent

by adding dripping agent, the contact angle between the agricultural film surface and water can be adjusted to make water droplets infiltrate the film surface, avoid the formation of fog droplets on the film surface, improve the illumination in the shed, and prevent the occurrence of diseases and pests caused by water droplets

pvc film antifogging dripping agent is mainly composed of polyglycerol stearate and sorbitol monostearate surfactants. Antifogging agents for PE and EVA greenhouse films are mainly composed of stearic acid polyol esters, polyoxyethylene and organic amine non-ionic surfactants

mist eliminator

the prominent problem of the greenhouse film popularized and applied in China is that the fog in the film is heavy, which leads to the increase of diseases and pests in the greenhouse, and also affects the daylighting of crops in the greenhouse. Therefore, the development of antifogging agent has become another hot spot in the application and development of agricultural plastic additives in China

The action mechanism of

antifogging agent is generally believed to use its high-efficiency moisture absorption ability to preheat the wire core and dry the cable core, reduce the air humidity near the film surface and maintain it below the saturated vapor pressure, at the same time, reduce the adhesion of the shed film to water droplets and make it flow down quickly along the film surface, so as to break the vapor-liquid balance of water in the shed and realize the reduction or elimination of fog. The advantages and disadvantages of antifogging agent lie in its ability to absorb water vapor and the speed of water film flow on the film surface. At present, some special surfactants (fluorine, silicon, etc.) are mainly used as antifogging agents to reduce or even eliminate fog. This is precisely the use of special surfactants with high moisture absorption capacity, oil and water repellency, and great surface activity

infrared barrier insulation agent

adding infrared barrier insulation agent can improve the insulation effect of greenhouse film. On the one hand, it can prevent the greenhouse from significantly reducing its temperature at night due to infrared radiation heat energy; On the other hand, it can prevent the canopy temperature from burning due to the absorption of a large amount of infrared rays at noon during the day, which plays an important role in ensuring traffic safety and burning crops. At present, most of the infrared barrier agents widely used in China are inorganic compounds. The common inorganic fillers mainly include kaolin, talc powder, light calcium carbonate, diatomite, sericite, and layered hydrotalcite that directly affects the normal operation of safety barriers

light conversion agent

in recent years, with the development of agricultural technology, a new type of physical fertilizer, light fertilizer, has emerged, that is, to improve the light conditions of crops to achieve the increase of crop yield. By adding a light conversion agent to the agricultural film, the ultraviolet light or yellow green light in the sunlight that is not beneficial to crops (even harmful on certain occasions) C and the software provide data analysis function at the same time, and convert it into red orange light or blue violet light that is conducive to plant photosynthesis, so as to improve the lighting conditions of crops, improve the utilization rate of solar energy, and realize the increase of yield and quality of crops, which has become an important way to use light fertilizer at present

light conversion agents are generally organic substances containing π electrons. They can realize the transformation of incident light and emitted light through their own excitation, which can significantly improve the quality and yield of crops and reduce diseases and pests. At present, there are generally two types of light conversion agents: organic (organic fluorescent pigments) and inorganic (inorganic organic rare earth metal ion complexes)

organic fluorescent light conversion agents are mainly composed of large conjugated systems and some chromophores with electron donating properties, so as to realize the conversion of light energy under external light conditions. This kind of product has a long half-life, but it has the disadvantage of low excitation efficiency, which limits its effectiveness and is less applied in the market

rare earth ions used in inorganic organic rare earth metal ion complexes, such as eu3+, sm3+, dy3+ and other elements. When some organic compounds with low excitation energy and high efficiency are used as ligands, it is easy to produce the energy conversion phenomenon of light. The excitation efficiency of rare earth ion complexes is high, which has become the focus of the application and development of light conversion agents

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