| With the development of agriculture and metallurgical silicon industry,white pollution,land desertification,and the accumulation of waste micro-silica（SF）have become a problem that cannot be ignored.In view of this,a degradable micro-silica-containing powder has been developed.Liquid mulch film can not only improve environmental pollution,land desertification problems,but also realize high value application of micro silicon powder.In the experiment,a stable dispersion of microsilica suspension liquid suspension was prepared by adding a stabilizer,a film former,a crosslinking agent,and a microsilica powder（SF）,etc.,and the suspension was stable in a temperature range of 10°C to 30°C.For more than 40 days,0.075%（mass fraction,the same below）SF addition can increase the tensile strength of the composite film from 9.05MPa to 12.9MPa,and the elongation at break is increased from 11.25%to 46%.44.8-69.5%increased to 52.9-73.2%,water solubility decreased from 84.8%to 54.6%;pre-crosslinking method was used to improve the water resistance of the composite membrane.Under RH=45%environment,the water vapor transmission rate（WVP）value was determined by 3.35×10-11g m/pa·s·m2 decreased to 2.945×10-11g m/pa·s·m2,the water absorption rate decreased from 25.23%to20.52%,within the range of RH=75%-95%,pre-delivery The insoluble particles produced by the combination can slow the increase rate of WVP value and improve the structural stability of the composite membrane;the water retention application effect of the composite membrane is lower than the theoretical value,but still has a good water retention effect,and the practical application of different molecular weight PVA composite membranes There is no big difference in the water quality of Zhongbao.The degradability of the two crosslinked composite membranes was analyzed by light-filling and other conditions.The pre-crosslinked composite membrane did not produce micropores produced by the direct cross-linked membrane during the degradation process,and it could be kept in the degradation process.High integrity and good durability;in practical applications,the use of SF can improve the content of Si,K,Ca and Mg in the soil.The use of urea and ammonium chloride can effectively improve the soil N.The amount of elements contributes to plant growth. |
