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通过合成醋酸乙烯酯(VAc)、丙烯酸丁酯(nBA)、甲基丙烯酸甲酯(MMA)、丙烯酸(AA)四元共聚合乳液,并添加陶瓷粉,制成高分子保护膜,将该膜均匀涂于寒富苹果1年生枝条及顶花芽进行抗寒性试验。结果表明,制备的聚合乳液成膜性好,膜层耐久性好;在-45~-33℃低温胁迫下,涂膜1年生枝条相对电导率均明显低于对照,通过拟合Logistic曲线方程,计算其低温半致死温度为-33.22~-31.51℃,低于对照(-30.73℃);田间观察涂膜顶花芽越冬期间80%以上无冻害,并推迟其10天萌芽,以保护膜+6%陶瓷粉处理对提高寒富枝条及顶花芽抗寒性效果最好。
A polymer protective film was prepared by synthesizing vinyl acetate (VAc), nBA, MMA, and acrylic acid (AA) quaternary copolymerization emulsion, and adding ceramic powder, and the film Evenly applied to the winter-rich apple 1 year branches and top flower buds for cold resistance test. The results showed that the prepared emulsion had good film-forming property and good film durability. The relative electrical conductivity of one-year-old branches of the film was obviously lower under the low temperature stress of -45 ~ -33 ℃. By fitting the Logistic curve equation, The half lethal temperature at low temperature was -33.22 ~ -31.51 ℃, which was lower than that of the control (-30.73 ℃) Ceramic powder to improve the cold-rich branches and flower buds the best cold hardiness.