采用硅烷偶联剂KH550对气相SiO2进行表面改性,制备肥料缓释用改性SiO2/PU复合包衣涂层。探究了改性SiO2含量对树脂性能及肥料缓释性能的影响。结果表明,与添加改性SiO2之前相比,多元醇、多异氰酸酯和改性SiO2混合料黏度增大,复合涂层耐水性提高、拉伸强度增大、断裂伸长率降低,肥料缓释期延长。而且,随着改性SiO2含量的增多,混合料黏度不断增大,涂层吸水率不断减小,断裂伸长率、水接触角基本不变,拉伸强度增大,肥料缓释期先增大后降低。当改性SiO2含量为2%(wt,质量分数)时,制备的包衣肥料缓释期最长,可达59d,与添加改性SiO2之前相比延长了32%。
Gas phase silica(SiO2) was modified using the silanecoupling agent KH550 to prepare the modified SiO2/polyurethane(PU) composite coating for controlled-release fertilizer.The effect of modified SiO2 content on the properties of the resin and the controlled-release fertilizer was investigated.The results showed that compared with before adding modified SiO2,the mixture viscosity of polyol and polyisocyanate with modified SiO2 increased.The composite coating showed an increased water resistance and tensile strength,while an decreased elongation at break.And fertilizer showed an longer controlled-release period.Moreover,with the increase of modified SiO2 content,the viscosity of the mixture increased continuously.The water absorption rate of the coating decreased.The elongation at break and the water contact angle basically remained unchanged.The tensile strength increased.Andthe fertilizer release period first increased and then decreased.When the modified SiO2 content in the coating film layer was 2%,the prepared coated fertilizer had the longest controlled-release period that reached up to 59 days.And this period extended 32% compared with that of fertilizer containing no modified SiO2.
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