Method for testing cloud point of polyether polyol
A technology of polyether polyol and test method, which is applied to measuring devices, instruments, scientific instruments, etc., can solve the problems of danger, slow heating, heating and cooling, etc., and achieves the effect of high safety
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Embodiment 1
[0022] Take by weighing 1g polyether polyol (trifunctionality 3000-6000 molecular weight, EO content 10-20%) in the 250ml grinding mouth conical flask, then take by weighing 99g pure water and add in the conical flask, be made into the solution of 1% concentration, Insert a rubber stopper with a thermometer, submerge the red point of the thermometer under the liquid surface of the solution, preferably in the middle of the solution, start stirring for 20 minutes until the solution is evenly mixed. Set the magnetic stirring heating temperature to 80°C, stir while heating, and record the temperature at this time after the solution becomes completely cloudy (the red point of the thermometer cannot be seen). This temperature is the cloud point of polyether polyol, and the cloud point is 10- 17°C; if the solution is turbid after mixing and before heating, it is necessary to freeze the turbid solution in the freezer until it is clear and transparent, and then heat it to measure the cl...
Embodiment 2
[0024] Take by weighing 70g polyether polyol (trifunctionality 3000-6000 molecular weight, EO content 10-20%) in 250ml grinding mouth Erlenmeyer flask, then add 70g cloud point test liquid, cloud point test liquid is isopropanol and pure water Mixing, the mass ratio is 1:1, insert the rubber stopper with a thermometer, submerge the red point of the thermometer under the liquid surface of the solution, preferably in the middle of the solution, start stirring for 20 minutes until the solution is evenly mixed. Set the magnetic stirring temperature to 70°C, stir while heating, and stir for 20 minutes until the solution becomes completely cloudy (the red point of the thermometer cannot be seen), this temperature is the cloud point of polyether polyol, and the cloud point is 50-65°C .
[0025] Because of the difference in the cloud point test solution, example 1 is affected by the external temperature. When the temperature is high, the polyether polyol will become cloudy after mixin...
Embodiment 3
[0027] Accurately weigh 0.50g polyether polyol (two-functionality, 4000 molecular weight, EO content 20-25% in a 250ml Erlenmeyer flask, feed method EO is all capped or EO has both blocks and caps), and 0.15gNaCl Dissolve in 150g of pure water to make a 0.1% NaCl aqueous solution, stir well with magnetic stirring, if it is not easy to dissolve, heat it until the NaCl is completely dissolved; pour all the prepared 150g of 0.1% NaCl aqueous solution into the triangular flask, Put it on a magnetic stirrer, the concentration of polyether polyol is 0.33%, insert a rubber stopper with a thermometer, submerge the red point of the thermometer under the liquid surface of the solution, preferably in the middle of the solution, start stirring for 20 minutes until the solution is evenly mixed. Set the magnetic stirring temperature to 80°C, stir while heating, until the solution becomes completely cloudy (the red point of the thermometer cannot be seen), this temperature is the cloud point ...
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