水性可剥离涂料的制备和性能

以tm803聚氨酯乳液为基体,以BYK-151为润湿分散剂、BYK-011为消泡剂、BYK-333为流平剂、BYK-425为增稠剂,以纳米碳酸钙为填料,制备出一种新型水性可剥离防护涂料。讨论了纳米碳酸钙用量及涂层厚度对涂膜拉伸和断裂性能的影响,研究了放置时间对涂层力学性能的影响。性能测试表明,当纳米碳酸钙的加入量为2%,涂层厚度为0.13～0.14mm时,涂层平均拉伸强度达9.51MPa,平均断裂伸长率达274.54%,具有较好的可剥离性能。涂装7天后,放置时间对涂层性能影响很小,涂层平均拉伸强度及平均断裂伸长率基本不变,因此可使用该涂料对设备进行长期封存防护。

Preparation and Properties of Waterbased Strippable Protected Coating

The new water-based strippable protected coating was made by polyurethane emulsion and nano-CaCO₃ was put in the coating as the fillers.BYK-151,BYK-011,BYK-333 and BYK-425 were used as wetting agent and dispersant,deforming agent,rheological agent and thickening agent respectively.The influence of nano-CaCO₃ and the film thickness on the coating were discussed,and the influence of storage period on the film was studied.The performance of the coating was tested,when the dosage of nano-CaCO₃ was 2% and the film thickness was 0.13⁰.14 mm,the film had good strippable ability.Its average mechanics intensity was 9.51 MPa and its average elongation at break was 274.54%.After 7 days the influence of storage period on the film was very little,and its average mechanics intensity and its average elongation at break were almost constant,so the film could be used as send up protection for the equipment safe keeping chronically.