氯化聚丙烯的磺化改性研究与应用

Study on sulfonation modification of chlorinated polypropylene and its application

以氨基磺酸为磺化剂对氯化聚丙烯(CPP)进行磺化改性,研究了氨基磺酸的用量、反应温度和时间对磺化度的影响,获得了较佳的反应条件:m(NH2SO3H)/m(CPP)=0.08,温度60℃,时间8.0h。在此条件下可制得磺化度为1.56mol/kg的磺化CPP。通过红外光谱对磺化CPP进行了表征。将磺化改性的CPP与丙烯酸酯聚合,制备了水性磺化CPP–丙烯酸酯乳液。以此乳液制备金属防腐涂料,所得涂膜附着力0~1级,硬度3B^2B,柔韧性>2mm,在3%NaCl溶液中浸泡45d和盐雾腐蚀试验300h后完好。该磺化改性CPP可用于制备水性金属防腐涂料。

Chlorinated polypropylene （CPP） was modifiedby sulfonation with sulfamic acid. The effect of sulfamicacid dosage, reaction temperature and time on sulfonationdegree was studied. The optimal reaction conditions wereobtained as follows： mass ratio of sulfamic acid to CPP 0.08,reaction temperature 60 ℃, and time 8.0 h. The sulfonatedCPP with a sulfonation degree of 1.56 mol/kg was preparedunder the above conditions, and then characterized byinfrared spectroscopy. A water-based sulfonated CPP—acrylate emulsion was synthesized by polymerization of thesulfonated CPP with acrylates, and then used to prepare aanticorrosive coating material for metals. The cured filmobtained features adhesion strength 0-1 grade, hardness3B-2B, and flexibility 〉2 mm, and can endure 3% NaClimmersion for 45 d and salt spray corrosion test for 300 h. The sulfamic acid-modified CPP is applicable to preparationof water-based anticorrosive coating for metals.