（1）颜料本身的细度大于色漆要求的细度，无法研细
如重体碳酸钙用于调和漆，细度很难达到40μm；云母氧化铁用于底漆，细度很难达到50μm；石墨粉用于导电磁漆，细度很难达到80μm。这些情况皆系颜料的原始颗粒大于色漆要求的细度所致。解决的办法只能将颜料进一步加工粉碎，使其本身粒径大小达到色漆要求的细度以下。因为色漆研磨的“分散过程”解决不了使颜料原始颗粒进一步变小的问题。
（2）颜料颗粒聚集紧密很难分散
如炭黑、铁蓝很难分散。在生产中遇此情况可做如下处理：一是合理调整工艺，如砂磨分散工艺，可采取球磨或三锟磨配合后再经砂磨机分散；三锟磨分散工艺可采取多道研磨的方法，第一、二道松车稠浆分散，第三道将漆浆补漆料或溶剂后紧车分散。二是使用分散剂，其他如炭黑的溶剂预浸也可提高分散效率。但这些办法都会给生产带来不便，使产基受到影响。因此皆属权宜之计，根本方法是进行颜料的表面处理，提高其研磨分散性能，如经环烷酸锌表面处理的铁蓝易于分散，经表面氧化处理的炭黑较未处理的易于分散，经表面处理的金红石型钛白较未处理的锐钛型钛白易于分散。
综合上述两点不难看出，颜料的超微粉碎和表面处理是保证色漆质量，提高生产效率的重要前提，应当加以重视。
（3）颜料杂质含量多，无法研细
Such as mixing fibers, paint leather, dust, fine sand and other impurities. The solution is to first rely on the pigment supply department to strengthen management, strictly prohibit the mixing of impurities, and ensure product quality. Second, strengthen the filtration of paint materials when mixing ingredients in the color paint production workshop. Note that the impurities that can be identified Millbase. For the impurities that have been mixed in, when using a three-roll mill to disperse, it can be operated with a full bucket or a surplus bucket, or a single-roll mill can be used in series to make full use of its filter residue. The sand mill can adopt the method of hanging a filter bag at the outlet, but the finer Impurities are difficult to separate and remove.
(4) The fineness of the paint itself does not meet the requirements of the color paint
If the alkyd enamel with a fineness of 20 μm is produced, but the fineness of the alkyd paint itself is less than 20 μm, the grinding base will not be able to reach the required fineness. Therefore, the fineness of the paint needs to meet the specified fineness standard, otherwise the fineness of the paint will not be guaranteed.
