Fully biodegradable mulch film for inhibiting weeds and preparation method thereof

Abstract

The invention discloses a fully-biodegradable mulching film for inhibiting weeds. The fully-biodegradable mulching film is prepared from the following components in parts by weight: 60-80 parts of polylactic acid, 10-30 parts of poly(butyleneadipate-co-terephthalate), 5-10 parts of a carbon black master batch, 0.1-1 part of an antioxidant and 10-20 parts of a flexible modifier, wherein the carbonblack master batch is prepared from the following components in parts by weight: 30-80 parts of PBAT, 15-35 parts of carbon black, 5-25 parts of herbicide and 1-10 parts of a carbon black dispersion treatment agent. According to the mulching film, an adsorption function of carbon black is utilized to mix a herbicide into the carbon black, then the herbicide and the carbon black are mixed through high-speed stirring, and the mixture is granulated under the action of a biodegradable resin carrier to prepare a carbon black master batch which is then added into the degradable mulching film in proportion for blow molding of a film; since the herbicide enters the space inside the carbon black and is wrapped by the carbon black in the mixing treatment process, the herbicide is not separated out in the process of blowing the mulching film and in the process of storing the mulching film.

Description

technical field [0001] The invention relates to a weed-inhibiting fully biodegradable mulch film and a preparation method thereof, which is mainly used for covering the mulch film and can effectively inhibit the growth of weeds, and belongs to the field of polymer material processing and application. Background technique [0002] With the development of the plastic industry, the use of plastic products is becoming more and more extensive. Among them, the agricultural plastic mulch film used for covering crops is widely used because of its functions of heat preservation and moisture retention; however, the non-degradability of petroleum-based resins has caused great pollution to the soil environment. , so there are currently many degradable mulch films to replace non-degradable mulch films; while covering mulch films is beneficial to the growth of crops, weeds are also more serious, so manual weeding or herbicides are required, and labor costs are high; herbicide mulch films a...

AI Technical Summary

Problems solved by technology

As we all know, if the compatibility of the herbicide and the blended plastic is excellent, then the herbicide will not be precipitated in the plastic, and the purpose of weeding will not be achieved; the herbicide and the blended plastic must be incompatible. Only when the herbicide is precipitated in the medium can the weeding effect be achieved; however, the herbicide that is incompatible with the plastic is easily precipitated when added to the plastic, and often the weeds have not grown yet, and the herbicide has been precipitated or there is little left, even during the storage and transportation of the plastic film. A large amount has been precipitated in the mulch film, which greatly reduces the concentration of herbicides in the mulch film and cannot achieve the weeding effect