Preparation Of Botanical Superfine Grinding Powders And Demonstration Of Biodegradable Mulch Film

In this study,firstly,the effect of high pressure homogenization on the properties of sugar beet pulp was investigated;then the effects of superfine grinding on physicochemical,thermal,and structural properties of Moringa Oleifera leaf powders were investigated;finally,the degradation characteristics of self-made PBAT biodegradable mulch film on corn crops were studied.The main results are as follows:1.High pressure homogenization changes the apparent viscosity and dynamic modulus of the sugar beet pulp suspensions;the strain amplitude dependence of sugar beet pulp suspensions changed from type I(strain thinning)to type III(weak strain overshoot)after high-pressure homogenization,;as the pressure increases from 0 to 50 MPa,the red-stained areas of pectin substances becomes larger and more dispersed,and the Dr value decreases;the melting temperature and crystallinity index value decreased with the increase of high pressure homogenization pressure.2.Superfine grinding could produce smaller Moringa Oleifera leaf particles with wider particle size distribution and greater surface area.The superfine grinding process decreased the dietary fiber content,protein content,bulk density,tap density,water holding capacity,oil holding capacity and peak temperature(Tp)but increased the angle of repose,slip angle and crystallinity index(CI)values.In addition,the superfine grinding process changed the particle shape and reduces the surface roughness.3.The cracking time of all degradable mulch film samples was mainly concentrated in about 45 days.At 60 days,the degradation rate of mulch film was accelerated,the holes were obvious,and the degree of surface exposure was serious.At the end of the covering period,it was difficult to separate the residual mulch film and the soil.At the later stage of sampling,the degree of degradation and fragmentation of the sample was high,and it almost did not meet the laboratory test standards.