A breathable and water-drop-free mulch film and its preparation method

Abstract

The invention provides a breathable and water-free mulch film and a preparation method thereof. The mulch film is sequentially provided with a mask layer, a temperature-adjustable ventilation layer and a hydrophilic layer from top to bottom. The mask layer is distributed with air holes. The temperature-adjustable ventilation layer is composed of butyl acrylate-styrene-chlorosulfonated polyethylene copolymer composite negative heat material, and the negative heat material is ZrW loaded with benzoyl peroxide 2 o 8 , The hydrophilic layer is composed of hydroxypropyl acrylate-styrene-chlorosulfonated polyethylene-polyvinyl alcohol copolymer. The prepared plastic film can increase the concentration of carbon dioxide gas and reduce the concentration of ammonia gas in the space covered by the plastic film, and at the same time, there is no obvious water drop formation on the inner surface of the plastic film, and a higher soil temperature can be maintained.

Description

Technical field: [0001] The invention belongs to the technical field of agricultural mulch, and in particular relates to a breathable and water-drop-free mulch. Background technique: [0002] Soil drought caused by low temperature and little rain is the main factor restricting the development of agriculture in northern my country. In response to these limiting factors, agricultural mulching technology has been widely used in northern my country to deal with it. At present, it has been confirmed that covering the surface of agricultural soil with plastic film can indeed play a number of roles such as increasing ground temperature, water retention, fertilizer preservation, weed control, pest control, salt suppression and seedling protection, and improvement of ground light and heat conditions. Most of the traditional mulch films currently used are plastic mulch films made of hydrophobic polymer materials. When in use, the entire plastic mulch film is laid on the soil surface, ...

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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