This instrument is currently a good low film temperature measuring instrument in China. It can simply, intuitively and accurately determine the low film temperature of polymer emulsions.
Implementation standards: GB / T9267-2008 and ISO2115-76 standards. It is used to measure the low film-forming temperature of polymer emulsion and interface treatment agent. It adopts multi-channel inspection digital display, which has accurate temperature control data and convenient calibration.
♦试验涂料槽：6条（长度 240mm，宽度 22mm，深度 0.25mm）
♦ Temperature range of gradient plate: arbitrarily adjustable between -10 ℃ ～ 50 ℃
♦ Gradient interval: 20 mm
♦ Gradient plate detection point: 13 points
♦ Test paint tank: 6 (length 240mm, width 22mm, depth 0.25mm)
♦ The inspection table shows: 16 points, of which 1 to 13 points are the working gradient temperature, 14 points are the instrument ambient temperature, and 15 and 16 points are the cooling water inlet and outlet temperature.
♦ Dimensions: 518X518X375mm
♦ Weight: 31kg
Third, the working principle:
♦ Set a cooling source and a heating source separately on a suitable metal plate and keep them at the constant temperature point of the set temperature. Through the principle of metal heat conduction, different temperature gradients are generated on the metal plate. A sample with a uniform thickness is coated on the temperature gradient plate, and the sample is formed into a film by evaporation of moisture from the temperature on the gradient plate. The phenomenon of film formation due to different temperatures on the gradient plate is also different. Finding the part of the dividing line is the MFT temperature of the sample.
When polymer emulsions are used as surface treatment agents such as coatings, adhesives, synthetic fabrics, leather, and paper, its film-forming properties are one of the important properties. The polymer emulsion or latex paint is coated on a metal plate. After the water evaporates, the polymer particles interact to form a continuous transparent film at a suitable temperature. The critical temperature during critical film formation is referred to as the low film formation temperature of the polymer emulsion, referred to as the MFT temperature.
♦ It is used to determine the low film-forming temperature of polymer emulsions. When polymer emulsions are used as surface treatment agents for coatings, adhesives, chemical fiber fabrics, leather, and paper, its film-forming properties are one of the important properties. The polymer emulsion or latex paint is coated on a metal plate. After the water evaporates, the polymer particles interact to form a continuous transparent film at a suitable temperature. The critical temperature during critical film formation is referred to as the low film formation temperature of the polymer emulsion, referred to as the MFT temperature.
将电源线接入电源插座（220 伏，50Hz 三孔插座，必须接地良好），接通冷却水，依次接通总电源开关、加热、巡检、制冷开关，仪器面板立即显示出相应动作（指示灯亮，数显表显示数字）。
根据所测试漆膜条件不同，需设置不同测试条件。主要是制冷和加热预置（设置方法见 LU-906M 智能调节器使用说明书），巡检表在出厂前已调好，一般情况下不需调整。
时间约在 120 分钟左右（视设定温度而定，若发现巡检表在一定时间内 1 ～ 13 各点显示稳定或变化**小即为预热完成）方可加入试样。平衡时间取决于低温度设定，温度设定越低，平衡时间则越长。干燥剂同时放入盒中，可以较大限度避免水蒸气以及冷端结冰。
大约经过 60 ～ 90 分钟，梯度板上的涂层发生一系列的变化，乳胶漆用乳液水分蒸发后，聚合物分子相互作用，在适当温度下形成连续薄膜，高于该乳液 MFT 的部分成膜透明，低于 MFT 的部分发生龟裂或产生白垩现象。这个明显的分界线即为该乳液的低成膜温度（MFT）确定成膜线后，根据其位置，用标尺的细分刻度计算出准确温度。
Fourth, use method:
Open the packaging box (the packaging box can be reused, please keep it properly for future maintenance and transportation) and check for damage or shortage. After verification, place the instrument near the water in the laboratory and do the cleaning first. Then check the power input and the water inlet and outlet are connected properly.
Preparation before use:
Connect the power cord to a power socket (220V, 50Hz three-hole socket, which must be well grounded), connect the cooling water, and then turn on the main power switch, heating, inspection, and cooling switch in turn. The instrument panel immediately displays the corresponding action (instruction The light is on and the digital display meter shows the number).
Commissioning the instrument:
Depending on the conditions of the paint film being tested, different test conditions need to be set. Mainly the cooling and heating presets (see the LU-906M Intelligent Regulator User Manual for the setting method). The inspection table has been adjusted before leaving the factory. Generally, no adjustment is required.
The time is about 120 minutes (depending on the set temperature, if it is found that the inspection table shows a stable or change at 1 to 13 points within a certain period of time, the preheating is completed when it is small) before adding the sample. The equilibration time depends on the low temperature setting. The lower the temperature setting, the longer the equilibration time. The desiccant is put into the box at the same time, which can largely avoid water vapor and cold end freezing.
Remove the glass cover and use a spoon or a dropper to inject the test and known emulsion into the tank of the gradient plate, and then coat it with a spreader to cover the glass cover. (Glass products, please handle lightly)
After about 60 to 90 minutes, a series of changes occurred in the coating on the gradient plate. After the emulsion paint evaporates the water from the emulsion, the polymer molecules interact to form a continuous film at an appropriate temperature, and a portion higher than the emulsion MFT forms a film. Transparent, cracked or chalky in parts below MFT. This obvious dividing line is the low film-forming temperature (MFT) of the emulsion. After determining the film-forming line, according to its position, the accurate temperature is calculated by the subdivision scale of the ruler.
Five, detailed configuration list
Plexiglass cover: one
Power cord: one (already installed)
Gradient plate: one (installed)
Cooling source: one set (already installed)
Heating tube: one set (already installed)
Fan: One (installed)
Temperature control meter: two (installed)
Inspection form: one (already installed)
Temperature probe: eighteen (installed)
Catheter: two (already installed)
Insurance tube: four
Instructions: one copy
Certificate of conformity: one