Defoaming kettle and defoaming method for preparing polyamide acid resin
A polyamic acid resin and defoaming technology, which is applied in the field of defoaming kettles and polyamic acid resin manufacturing, can solve the problems of difficult to remove tiny bubbles and shorten the defoaming time, so as to reduce the apparent color difference defects and shorten the defoaming time , Improve the effect of surface quality
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[0027] Manufacture the used defoamer embodiment of polyamic acid resin
[0028] The defoaming kettle embodiment that this manufactures polyamic acid resin is used for example figure 1 As shown, there is a feed pipe 1 above the defoaming tank containing the polyamic acid resin liquid, a discharge pipe 6 below, and a thin-layer distributor 3 is installed in the tank. The thin-layer distributor 3 of this example is a spherical surface, and the center line of the spherical surface coincides with the central axis of the tank body. The distance between the vault of the spherical surface and the lower port of the feed pipe 1 extending into the tank is 10mm, and the lower edge of the spherical surface and the inner wall of the tank The gap is 1.0mm, and the height of the spherical surface is 0.4 of the diameter of the spherical surface, which is 1 / 3 of the internal height of the tank. There are 2 places on the lower edge of the thin-layer distributor fixedly connected with the inner ...
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