通过黏度来评定彩钢板涂料性能指标

彩钢板涂料黏度即液体流动时所产些的摩擦力，也叫内摩擦力，度过能;因流动性大，，成不均匀膜厚;黏度过高:流动性差，易造成涂层表面不光滑。

(4)迅速移开手指时，同时启动秒表，待试样流束刚中断时立即按停秒表，计时。(5)料黏度太高需要调整时，应加人适宜的稀释剂，但稀释剂用量一般不超过涂料总质量的5%。

The viscosity of the coating is the friction produced by the liquid flow, also known as internal friction, excess energy; due to the large fluidity, the film thickness is uneven; the viscosity is too high: poor fluidity, easy to cause the coating surface is not smooth.

Roll coating is mainly used in coil coating construction, so the viscosity value of coating can be read at any time. In order to ensure the film thickness and leveling, and make the film surface smooth, it is very important to control the viscosity. The viscosity index of coil coatings (determined by coating-4 cup viscometer) is generally between 80-120s. The national standard GB / T 1723-93 viscosity determination method is adopted for testing methods and standards. At present, a variety of on-line viscometers have been produced abroad. Among them, the on-line viscometer developed by hydramotion company in the UK is more convenient and intuitive (see Figure 4-1), which can be directly installed in the coating mixing drum,

The following points should be noted during measurement:

(1) The measuring temperature should be between 21 ℃ and 25 ℃. Because the temperature is too high, the measured viscosity is relatively small, and the temperature is too low, the viscosity is relatively large, which is not shown in Fig. 4-1 online viscometer

Is the standard value.

(after two times, clean the - 4 cups with the paint testing agent to prevent the small holes from being blocked.

(3) First, close the small hole with fingers or instruments, fill it with 100ml coating, and pour bubbles and excess samples into the groove with glass rod to prevent the sample from less than or more than 100ml.

(4) When the finger is removed quickly, start the stopwatch at the same time. When the sample flow is interrupted, press the stop watch immediately to count the time. (5) When the viscosity of the coating is too high and needs to be adjusted, appropriate diluent should be added, but the amount of diluent is generally not more than 5% of the total mass of the coating.