Carbon black master batch for herbicide-containing plastic mulching films and preparation method thereof

Abstract

The invention belongs to the field of herbicide-containing plastic mulching films, and particularly relates to a carbon black master batch for herbicide-containing plastic mulching films, which is used in multifunctional agricultural mulching films for weeding, soil moisture preservation and thermal insulation. The invention is characterized in that the carbon black master batch is composed of 40-60 parts by weight of granulating carbon black and 40-60 parts by weight of resin. The melt mass flow rate of the resin is 2-50g / 10min, and the resin is used for solving the problem of high dispersity under the condition of high concentration of carbon black. The carbon black is the granulating carbon black of which the micromolecule volatilization amount is at most 0.5% within the temperature and time ranges of the film blowing technique; and the carbon black is selected to control the micromolecule volatilization amount, thereby solving the problems of bubbles, spots pinholes in the blown film product. The concentration of the carbon black in the master batch is up to 40-60%, thereby ensuring the blackness of the herbicide-containing plastic mulching films. The light transmittance is at most 1%, and the haze is at least 25%; and the carbon black master batch has high optical resistance, and completely intercepts sunlight required by photosynthesis of weed growth, thereby achieving the effect of 95% above weeding effect and reducing the environmental pollution.

Description

technical field [0001] The invention belongs to the field of weeding film, and in particular relates to a carbon black masterbatch and a preparation method of a multifunctional agricultural film used for weeding, moisture conservation and heat preservation. Background technique [0002] According to the survey, there are more than 580 species of weeds in farmland in my country, including 129 species in paddy fields, 427 species in dry fields (lands), and 24 species in both wet and dry lands. According to the statistics of the Food and Agriculture Organization of the United Nations, the world's average annual yield reduction due to weed damage is 10-15%. At the beginning of this century, the damaged area of ​​farmland in my country reached 42.78 million hectares, and 35.8 million hectares of farmland were severely damaged by weeds, and the annual yield of weeds was reduced by 12.3%-16.5%. The amount of chemical agents used in general weeding is increasing every year. Accord...

AI Technical Summary

Problems solved by technology

However, this herbicide film currently exists due to the low concentration of carbon black and poor dispersibility, and the quality of the black film blown with it is poor, and there are quality problems such as bubbles, spots, broken films, and pinholes; on the other hand, due to If the blackness is not enough, the light transmittance of the produced weeding film cannot reach the level of low light transmittance of foreign weeding film, and the weeding effect is poor

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