THE PAINT FORMING PRESSURIZED DISPERSION HAVING AN EXTENDED SHELF LIFE AND THE METHOD FOR PREPARING THEREOF
申请人:Maston OY
公开号:EP3412735A1
公开(公告)日:2018-12-12
The invention relates to paint forming, pressurized dispersion in a sealed aerosol can said dispersion having an extended shelf life, comprising an epoxy resin, epoxy hardener precursors, ketones, organic solvent, pigments, paint additives, dispersion additives, propellant and 1-10000 ppm of free water into said sealed can which has been provided alongside with said paint forming chemicals into said can. Epoxy hardener precursors are selected from the group consisting of an imine, an enamine, a Mannich base, a Schiff's base, aldimine, an azole preferable an oxazole such as an oxazolidine and mixtures thereof;
- for extending the shelf life of the dispersion, the amount of weak acid (XCOOH) is adapted on the basis of H2O (free water) present in the can, for preventing the formation of epoxy hardeners from said epoxy hardener precursors, wherein said epoxy hardener is a compound with amine functionality,
the amount of the weak acid being adapted in the range of 0.01-10% by weight (w/w) of the paint forming dispersion, preferably from 0.1 to 5%, still more preferably from 0.25 to 2 %, which weak acid is further selected from the group which have the pKa value in the range from 1.2 to 9.9 preferably 1.2-5.2;
- additionally also temporary hydrolyzed products of said epoxy hardener precursors are present in said dispersion, which hydrolyzed products are carbino-lamines, which originate to the reversible reaction (2a; 2a1) catalyzed by said weak acid (XCOOH)
- the amount of epoxy hardeners, free water, ketones, propellant and possible organic solvent, possible pigments is at least 95% w/w from the total volume of the paint forming solution and the rest of said solution composes of the paint additives and dispersion additives.
本发明涉及在密封气雾剂罐中的涂料成型加压分散体,该分散体具有较长的保质期,由环氧树脂、环氧固化剂前体、酮类、有机溶剂、颜料、涂料添加剂、分散添加剂、推进剂和 1-10000 ppm 的自由水组成,与上述涂料成型化学品一起注入密封罐中。环氧固化剂前体可从以下组别中选择:亚胺、烯胺、曼尼希碱、席夫碱、醛亚胺、唑类(最好是噁唑类,如噁唑烷)及其混合物;
- 为了延长分散体的保质期,弱酸(XCOOH)的用量根据罐中的 H2O(游离水)进行调整,以防止环氧固化剂前体形成环氧固化剂,其中所述环氧固化剂是具有胺官能团的化合物、
弱酸的用量为涂料分散体重量的 0.01-10%,优选 0.1-5%,更优选 0.25-2%,弱酸进一步选自 pKa 值在 1.2-9.9 之间的组,优选 1.2-5.2;
- 此外,在所述分散液中还存在所述环氧固化剂前体的临时水解产物,该水解产物为碳氨基胺,其源于所述弱酸 (XCOOH) 催化的可逆反应 (2a; 2a1)
- 环氧固化剂、游离水、酮类、推进剂和可能的有机溶剂、可能的颜料的用量至少占涂料形成溶液总体积的 95% w/w,其余的溶液由涂料添加剂和分散添加剂组成。