Process for the preparation of binder dispersions capable of being
cathodically deposited using crosslinking agents based on
polyisocyantes blocked by hydroxyl groups
    1.
    发明授权
    Process for the preparation of binder dispersions capable of being cathodically deposited using crosslinking agents based on polyisocyantes blocked by hydroxyl groups 失效
    使用基于通过羟基组合阻滞的聚异氰酸酯的交联剂来严格沉积的粘合剂分散体的制备方法

    公开(公告)号:US5086090A

    公开(公告)日:1992-02-04

    申请号:US466437

    申请日:1990-06-13

    Abstract: The invention relates to a process for the preparation of aqueous dispersions to be further processed to electrocoating paints with baking temperatures below 160.degree. C. and baking times.ltoreq.30 minutes, which dispersions contain modified epoxide-amine adducts as binders and polyisocyanates blocked by hydroxyl groups as cross-linking agents.In this process polyepoxides and compounds containing one or more, preferably 2, hydroxyl groups per molecule are reacted at elevated temperatures in the presence of catalysts to furnish epoxide-containing intermediates.A solvent or a mixture of solvents is then added with external cooling ahd the solution is boiled under reflux, if necessary in vacuo, until the temperature of the solution drops to 95.degree. C. to 20.degree. C.Amines are then added onto the epoxide groups which are still present in a free state in the epoxy resin and a dispersion is prepared by adding a water/acid mixture after adding the crosslinking agent or the dispersion is first prepared and the crosslinking agent is added subsequently.

    Abstract translation: PCT No.PCT / EP88 / 00998 Sec。 371日期1990年6月13日 102(e)日期1990年6月13日PCT提交1988年11月3日PCT公布。 出版物WO89 / 04353 日本1989年5月18日。本发明涉及一种制备水性分散体的方法,以进一步加工成具有低于160℃的烘烤温度和烘烤时间<30分钟的电涂料,该分散体含有改性的环氧胺 - 胺加合物 作为粘合剂和被羟基封端的多异氰酸酯作为交联剂。 在该方法中,每个分子中含有一个或多个,优选2个羟基的聚环氧化物和化合物在升高的温度下在催化剂的存在下反应以提供含环氧化物的中间体。 然后加入溶剂或溶剂混合物进行外部冷却,将溶液在回流下煮沸,如果需要,在真空中直至溶液的温度降至95℃至20℃。然后将胺加入到环氧化物 在环氧树脂中仍然以游离状态存在的基团,并且通过在加入交联剂之后加入水/酸混合物或首先制备分散体并随后添加交联剂来制备分散体。

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