Special strengthening, toughening and transmittance increasing master batch for ultrathin fully-biodegradable mulch film

Abstract

The invention belongs to the technical field of biodegradable polymer materials, and especially relates to a special strengthening, toughening and transmittance increasing master batch for an ultrathin fully-biodegradable mulch film. The master batch is mainly prepared from poly(butylene adipate/terephthalate), polylactic acid, a strengthening, toughening and reflection reducing agent and a stability assistant. A preparation method of the master batch is simple and is easy to operate, and the obtained special master batch can be completely degraded and has a good dispersibility. A proper amount of the master batch is added in order to blow the ultrathin biodegradable mulch film with the thickness being 6 [mu]m or less, the film can be easily opened during the blow producing of the ultrathin mulch film, the processing stability and the processing efficiency are improved, and the produced mulch film has enhanced mechanical properties, improved light transmittance, reduced haze and remarkably improved weather resistance. The master batch combines strengthening, toughening, transmittance increasing and lubricating functions, is simple to use, improves the processing performances of the ultrathin fully-biodegradable mulch film, and reduces the use cost of the fully-biodegradable mulch film.

Description

technical field [0001] The invention belongs to the field of agricultural materials, and in particular relates to a plastic masterbatch, in particular to a special reinforcement, toughening and anti-permeability masterbatch for ultra-thin fully biodegradable plastic film. Background technique [0002] Plastic mulches play a huge role in agricultural production. However, most of the plastic mulches currently used are polyolefin mulches that are difficult to degrade in a short period of time or incompletely degradable polyolefin mulches that have been added with starch and photodegradants. The use of these mulch materials has caused "white pollution" of the environment and brought safety hazards to the sustainable development of human beings. Fully biodegradable mulch is made of completely biodegradable plastics through blow molding or tape casting. It can be completely decomposed by microorganisms. The final products of its degradation are carbon dioxide and water, which can ...

AI Technical Summary

Problems solved by technology

Patent CN 103589124B discloses a fully biodegradable PLA / PBAT composite mulch film and its preparation method; patent CN 104744898A discloses a fully biodegradable mulch film and its preparation method. Polyester (PPC), polybutylene adipate / terephthalate (PBAT) and heat stabilizer, but the thickness of these mulch films is generally high, 6um-50um, the cost of the mulch film remains high, and the light transmittance is poor. The strength is low, so it cannot be commercialized in the short term; different from the difficult-to-degrade polyolefin film, for the fully biodegradable film, as long as the processing is convenient and the performance is excellent, the thinner the film product, the better. We are also committed to solving the above problems. In 2013, we applied for a patent 201310749460.X for a fully biodegradable mulch masterbatch and its preparation method and application. However, we found that the masterbatch is used for blowing ultra-thin fully biodegradable film in practical applications. When using mulch, it is difficult to open the film bubble during the processing of the ultra-thin mulch film below 6 μm, the tensile strength and tear strength are greatly reduced, and the haze is large. Mulch film is prone to cracking in advance, so this technology has certain defects, and how to overcome this defect and provide a more balanced performance of mulch masterbatch has become a problem that we need to solve

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