用于纸张表面干法处理粉末涂料的制备与表征

以超临界流体法制备聚甲基丙烯酸甲酯(PMMA)-CaCO3粉末涂料,应用于纸张表面干法处理技术。为了解决无机颜料与有机胶黏剂界面结合、均匀分散等问题,探究了用硅烷偶联剂KH-570对纳米碳酸钙进行改性。实验考察了反应温度和改性CaCO3用量对制备的无水相涂料性能的影响,通过FT-IR、TG等对改性后CaCO3进行表征,利用GPC-十八角度激光光散射联用技术、TG、SEM等对制备的粉末涂料进行表征。实验表明,与未改性的纳米Ca-CO3相比,改性CaCO3与PMMA粉末涂料颗粒分布均匀,界面结合和分散状况基本能满足纸张表面干法处理的要求。

Preparation and characteristics of water-free coating particles of PMMA/modified nano-CaCO3 in supercritical carbon dioxide

Polymethyl methacrylate(PMMA)-CaCO3 powdery coating was made in the method of supercritical fluid and used in the dry surface treatment of paper.In order to solve the problems of combination and dispersion with PMMA,nano-calcium carbonate particles well dispersed in ethanol were modified by silane coupling agent KH-570.The effects of the reaction temperature and amount of modified calcium carbonate on the polymerization of MMA were discussed,the modified CaCO3 was characterized by FT-IR and TGA,and the powdery coating particles were systematically investigated by GPC,TGA and SEM methods.The experimental results indicated that the particle size of PMMA was smaller,which can be used to dry surface treatment of paper coating.From SEM observation,it was found that the modified calcium granules carbonate were able to evenly disperse and embedded in the PMMA and didn’t show conglomeration.Moreover,the interfacial bonds and dispersion situation of water-free powdery coating particles were fairly well.