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

Inactive Publication Date: 2020-06-02
SHANDONG BLUSR DONGDA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing public cloud point test method has the following problems: 1. Using a water bath, heating and cooling is slow; 2. Hydrochloric acid solution and calcium-butanol solution need to be prepared in advance; 3. The ampoule mouth needs to be sealed with fire , operate under certain pressure, and have certain danger under laboratory conditions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention, which belongs to the field of chemical analysis and detection, particularly relates to a method for testing a cloud point of polyether polyol. The test method comprises the following steps: step 1, weighing polyether polyol, adding the polyether polyol into a triangular flask, and adding a cloud point test solution; step 2, inserting a rubber plug with a thermometer, and carrying out stirring until the solution is uniformly mixed; step 3, starting a magnetic stirrer, and carrying out stirring while carrying out heating until the solution is completely turbid and setting the temperature to be a cloud point. The test method provided by the invention is suitable for various polyether polyols, and is scientific, reasonable, simple and feasible, and rapid and stable in test.

Description

technical field [0001] The invention belongs to the field of applied chemical analysis and detection, and in particular relates to a method for testing the cloud point of polyether polyols. Background technique [0002] Polyether polyol is a very important chemical raw material, which can be used to produce polyurethane foam, and it is also a very important surfactant. In the production process of polyether polyols, various general-purpose polyether polyols can be produced by changing the feeding method of PO and EO (mixed or separately added), the addition ratio, and the order of addition, etc. Polyether-type nonionic surfactants have good emulsification, detergency, wettability, dispersibility, biodegradability, low toxicity and low irritation, and have extremely flexible HLB value adjustment and multi-variety adjustable Therefore, as detergent, solubilizer, emulsifier, wetting agent, stabilizer, demulsifier, defoamer and other auxiliary agents, it is widely used in texti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/26G01N25/12
CPCG01N33/2811G01N25/12
Inventor 徐韦李帅
Owner SHANDONG BLUSR DONGDA CHEM
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