Super-transparent EVA film and production method thereof

Abstract

The invention relates to the technical field of film materials, in particular to a super-transparent EVA film and a production method thereof. The super-transparent EVA film comprises, by weight, 100 parts of EVA particles and 2-5 parts of EVA opening smooth master batch. The EVA opening smooth master batch comprises, by weight, 100 parts of EVA particles, 5-10 parts of erucyl amide, 3-10 parts of smoothing agent, 3-5 parts of nano-silica, and 1-3 parts of fluoropolymer processing agent. The production method includes the steps of firstly, preparing the EVA opening smooth master batch; secondly, extrusion casting forming; thirdly, cooling and shaping. The super-transparent EVA film has the advantages that the EVA particles, the high-purity erucyl amide, the organic silicone smoothing agent, the nano-silica and the fluoropolymer processing agent of the super-transparent EVA film are complementary and have combined action, one-step extrusion forming is used, later surface processing is not needed, and when the produced super-transparent EVA film is 0.10-0.50 in thickness, the light transmittance of the EVA film can reach above 97%, the haze of the EVA film can reach below 7%, and the service life of the EVA film can reach more than 24 months.

Description

Technical field [0001] The invention relates to the technical field of film materials, in particular to a super transparent EVA film and a preparation method thereof. technical background [0002] As we all know, my country's agricultural greenhouse film production and coverage area rank first in the world. However, there is still a big gap between the current development level of agricultural shed film in my country and the advanced level in the world. These gaps are not only manifested in quantity and variety, but also in high haze (>20%) and low light transmittance ( <90%) and other performance indicators. This is because domestic greenhouse film covering materials generally use high-pressure low-density polyethylene / linear low-density polyethylene (LDPE / LLDPE) blended resins, in which LLDPE resin is catalyzed by Ziegler-Natta catalyst and follows the coordination polymerization mechanism. It is composed of copolymerization of ethylene and 1-butene. Its molecular struct...

AI Technical Summary

Problems solved by technology

Therefore, in the process of blown film processing, when the resin changes from the molten state to the glass state, it is easy to generate large-sized crystal grains and the distribution of the crystal regions is uneven, which will cause irregular light refraction and light scattering on the film surface, resulting in LLDPE film High haze, poor transparency, etc.

This will not only affect the photosynthesis of crops, prolong the growth cycle of crops, but also reduce the yield of crops

In addition, the light transmittance, heat preservation and weather resistance of PVC transparent film are relatively poor, and the haze is relatively high. Because the material itself has a smell, a plasticizer needs to be added. Will change with temperature changes, easy to age, non-environmental protection products, can not meet modern environmental protection requirements

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