Thermal insulation properties of agricultural covering nonwovens

Sodium dodecyl benzene sulfonate( SDBS) was used for modifying TiO2and the effects of modifier dosage,temperature,time and pH value on the TiO2surface modification were investigated with orthogonal experiment. Results showed that when the amount of SDBS is 11%,at 90 ℃,with pH value of 5,treating for 45 min,the best modification result of TiO2is achieve. Tea trees were covered with nonwoens coated with different mass ratios of the modified TiO2,then the temperatures both inside the nonwoven shed and outdoor were recorded, and the contents of tea polyphenols and caffeine for comparision of the insulation effect of the agricultural covering nonwovens were measured. It was found that when the mass ratio of the modified TiO2is 25%,the maximum temperature diference between the nonwovens shed and outdoor is observed,contents of tea polyphenols and caffeine are the highest,and the insulation performance of agricultural covering nonwovens is the best.