High-strength polyethylene agricultural mulching film and preparation method thereof

Abstract

The invention discloses a master batch for a polyethylene mulching film and a preparation method thereof. The master batch comprises the following components in parts by weight: 35 to 60 parts of linear low-density polyethylene, 15 to 30 parts of metallocene polyethylene, 5 to 15 parts of high-density polyethylene, 1 to 3 parts of maleic anhydride, 5 to 15 parts of butyl acrylate-styrene copolymerwhiskers, 0.5 to 2 parts of a silane coupling agent, 0.5 to 1 part of a lubricating agent and 0.1 to 0.5 part of an antioxidant. By adding the butyl acrylate-styrene copolymer whiskers, the mechanical properties, tensile resistance and mechanical toughness of the mulching film are enhanced; meanwhile, the linear low-density polyethylene, the metallocene polyethylene and the high-density polyethylene in a specific ratio are selected, so the air permeability of the film is ensured; and the puncture resistance of the film is adjusted by adding the metallocene polyethylene.

Description

technical field [0001] The invention relates to a high-strength polyethylene agricultural mulch film and a preparation method thereof. Background technique [0002] Plastic film mulching is a relatively mature agricultural cultivation technology. It can not only retain water and fertilizer, keep moisture, keep warm, but also effectively increase and prolong the growth period of crops, ensuring the increase of crop yield. However, plastic film is a kind of polymer compound. It is extremely difficult to degrade, that is, it is not subject to microbial erosion, nor can it be decomposed by itself. Its degradation cycle is generally 200 to 300 years, and toxic substances will be dissolved during the degradation process! Recycling, the amount of residual film in the soil continues to increase. Since the residual mulch film is not easy to decompose and rot, the accumulation of mulch film fragments in the farmland will be a major hidden danger year after year. Not only does it cau...

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Problems solved by technology

[0003] The residual plastic film affects the physical properties of the soil and inhibits the growth and development of crops. The main components of the residual plastic film material are polymer compounds. Under natural conditions, these high polymer compounds are difficult to decompose. The migration of water and fertilizer, due to the change of the residual film fragments in the soil or the interruption of the continuity of the soil voids, causes greater resistance when the water moves, and the water moves downward slowly, so that the amount of water infiltration decreases with the increase of the film. The decrease of soil water content weakens the drought resistance ability of cultivated land, and even makes it difficult for groundwater to infiltrate, causing serious consequences such as soil salinization. Formation of normal soil structure, eventually reducing soil fertility levels

[0004] The plastic film has low strength, poor durability and short service life. The main reason is that the melt index of the plastic film is relatively high. Some resins that are not suitable for plastic film are also used as raw materials for plastic film. These inferior plastic films have low strength, poor durability, are easy to break, and are difficult to recycle. , is not easy to remove, which is one of the important reasons for the residue of plastic film

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