丙烯酸/蓖麻油聚氨酯耐磨涂料的研究

Preparation of wear resistant coatings of acrylic acid/ polyurethane modified by castor oil

介绍了丙烯酸/聚氨酯涂料的制备和性能测试工艺流程以及蓖麻油改性TDI制备聚氨酯、丙烯酸树脂和丙烯酸改性聚氨酯涂料的合成步骤。通过正交实验对羟基丙烯酸树脂和耐磨性填料———二硫化钼、氧化铬和聚四氟乙烯的用量进行了优化,获得了涂料的最优化配方(用质量分数表示):A组分:聚氨酯3%,醋酸丁酯3%;B组分:羟基丙烯酸1.5%,二硫化钼0.3%,三氧化二铬0.4%,聚四氟乙烯0.6%,混合溶剂5%,十二烷基硫酸钠0.12%,KH-5500.025%,二丁基二月桂酸锡0.0125%。所得涂膜的表干时间约为30min,实干时间约为36h。涂层的附着力1级,硬度1B。在3.3kg的载荷下,磨轮旋转1500圈后,涂层磨痕弦长6.5mm,说明涂料耐磨性优良。试样在质量分数分别为5%和15%的盐酸、氢氧化钠溶液中浸泡一周后,涂层无起泡、润胀和脱落现象,说明涂层耐蚀性优良。

The process flows for the preparation of acrylic acid/polyurethane coating and its performance determination , synthesis steps of polyurethane gained with TDI modified by castor oil, acrylic resin and coatings of polyurethane modified by acrylic acid were introduced. Dosage of hydroxyl acrylic resin and wear resistant fillings of molybdenum disulfide, chromium hemitrioxide and polytef was optimized by orthogonal test. Coatings＇optimum formula was gained as follows （by mass fraction ） ： A components： polyurethane of 3% , butyl acetate of 3% ; B components： hydroxyl acrylic acid of 1.5 % , molybdenum disulfide of 0.3 % , chromium hemitrioxide of 0.4%, polytef of 0.6%, mixed solvent of 5%, lauryl sodium sulfate of 0.12%, KH-550 of 0.025%, dibutyltin dilaurate of 0.0125% Film＇s surface drying time is about 30 min, and actual time is about 36 h. Coatings＇ adhesion is i grade, its hardness is 1 B. Chord length of wear trace of coating is 6.5 mm after 1 500 cycle of wheel rotation with a load of 3.3 kg. It shows that the coating has good wear resistance. There are no blistering, wetting inflation and peeling on coatings Mter dipping samples a weeklong into a solution with mass fraction of 5% , 15% of hydrochloric acid and sodium hydroxide, respectively. The coating shows good corrosion resistance.