Preparation method of water-drop-free mulching film with air permeability regulated and controlled by supported negative heat material

Abstract

The invention provides a water-drop-free mulching film with ventilation regulated and controlled by a load type negative heat material, the mulching film is sequentially provided with a surface film layer, a temperature-adjustable ventilation layer and a hydrophilic layer from top to bottom, and ventilation holes are distributed in the surface film layer. The temperature-adjustable air exchange layer is composed of a butyl acrylate-styrene-chlorosulfonated polyethylene copolymer composite negative heat material, the negative heat material is ZrW2O8 loaded with benzoyl peroxide, and the hydrophilic layer is composed of a hydroxypropyl acrylate-styrene-chlorosulfonated polyethylene-polyvinyl alcohol copolymer. The prepared mulching film has the effects of improving the concentration of carbon dioxide gas in a mulching film covering space and reducing the concentration of ammonia gas, meanwhile, no obvious water drops are formed on the inner surface of the mulching film, and high soil temperature can be maintained.

Description

Technical field: [0001] The invention belongs to the technical field of agricultural mulch films, and in particular relates to a preparation method of a water droplet-free mulch film with a load-type negative heat material regulated and breathable. Background technique: [0002] Soil drought caused by low temperature and lack of rainfall is the main factor limiting agricultural development in northern my country. In response to these limiting factors, agricultural plastic film technology has been widely used in northern my country. At present, it has been confirmed that mulching film on the surface of agricultural soil can indeed improve ground temperature, water conservation, fertilizer conservation, weed control, disease and insect prevention, salt suppression and seedling protection, and improvement of ground light and heat conditions. The traditional mulch film currently used is mostly plastic mulch film made of hydrophobic polymer material. When using, the whole piece o...

AI Technical Summary

Problems solved by technology

The operation method of such a plastic film is very simple and convenient, but because these traditional plastic films are not breathable, the space covered by the traditional plastic film forms a closed environment, which makes the air in the space covered by the traditional plastic film unable to exchange with the fresh air outside.

However, the growth and development of crops need respiration, that is, the photosynthesis of crops is to inhale CO in the environment 2 , the CO 2 It is transformed into the nutrients needed for the growth of crops, but when the crops are in a closed space, they cannot be ventilated in time, resulting in the CO in the closed environment 2 The gas concentration will continue to decrease, when the CO in a closed environment 2 When the concentration is lower than 300ppm, the photosynthesis of crops will be inhibited, causing problems such as slow growth of vegetables, flower drop, fruit drop, and reduced yield.

In addition, urea and other fertilizers are often used in agricultural soil to promote the growth of crops. However, these urea fertilizers will undergo chemical changes in the soil and release harmful gases such as ammonia. And other harmful gases, ammonia will continue to accumulate to a higher concentration, which can easily lead to the death of vegetable plants

In actual agricultural production, farmers will punch some holes in the traditional mulch to ventilate the crops, but these holes are physical holes, and these physical holes will remain on the mulch after they are produced and cannot be closed automatically. As a result, the cold air from the outside will enter the space covered by the plastic film through these physical holes, so that the plastic film loses its insulation effect

[0003] In addition, the traditional mulch is generally a plastic mulch made of hydrophobic polymer material, which makes it easy for the traditional mulch to accumulate water droplets (or water droplets) on the inner surface facing the soil when it is used, that is, the traditional mulch does not have the performance of waterproofing.

The water droplets of agricultural mulch film are very harmful to agricultural production. On the one hand, this kind of water droplets reduces the permeability of sunlight to the mulch film, and thus reduces the soil temperature covered by the mulch film. Spherical, spherical water droplets will focus sunlight, which can cause seedling burn and damage agricultural production

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