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。

彩钢板涂料卷材涂料的施工主要采用快速辊涂方式，所以随时可以读出上机涂料的黏度值。 彩钢板涂料为保证漆膜厚度及流平性，使涂膜表面平整光滑，对黏度的控制很重要。卷材涂料的黏度指标(涂-4杯黏度计进行测定)一般在 80-120s 之间，检验方法及标准等采用国标 GB/T 1723-93 涂料黏度测定法。目前国外已经生产出多种在线黏度计，彩钢板涂料其中英国的 Hydramotion 公司研制的在线黏度计比较方便和直观，可直接安装在涂料搅拌筒内，
测量时需要注意以下几点:
(1)测定温度应在 21~25℃之间。因为温度过高测定的黏度比较小，温度过低，黏度比较大，不 图4-1在线黏度计
是标准值。
(2次完后要用测涂料应的剂清洁涂-4 杯，防止测定小孔被堵。
(3)先用手指或器具堵严小孔漏嘴，倒满100mL涂料，用玻璃棒将气泡和多余试样倒人凹槽，防止测样不到或超过100mL。

(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.