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A preparation method of blank solution in polytetrahydrofuran base value determination method

A technology of polytetrahydrofuran base number and blank solution, which is applied in the direction of chemical analysis by titration method, can solve the problems of titration liquid concentration change, unstable base number measurement, large error in the base number measurement result, etc. Number of times, reliable technical support, and the effect of mentioning accuracy

Active Publication Date: 2021-06-25
SHAANXI SHANHUA COAL CHEM IND GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] During the testing of polytetrahydrofuran semi-finished products and finished products, it was found that the stability and accuracy of the base value measurement results were not enough, resulting in large errors in the base value measurement results
After separate analysis of multiple factors and multiple parameters, the determination of base number may be affected by the following factors: 1. Although the beaker and magnetic stirrer used for determination are cleaned as required, the determination of base number is relatively sensitive and may still be affected; 2. The buret may not be Accurate; 3. The titration data may be inaccurate due to the problem of the control system of the potentiometric analyzer; 4. The concentration of the titrant changes.
Through the separate analysis of the above four factors, it is found that the unstable and inaccurate determination of the base value is caused by the preparation method of the blank solution

Method used

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  • A preparation method of blank solution in polytetrahydrofuran base value determination method
  • A preparation method of blank solution in polytetrahydrofuran base value determination method
  • A preparation method of blank solution in polytetrahydrofuran base value determination method

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Embodiment 1

[0029] This embodiment provides a method for preparing a blank solution in a polytetrahydrofuran base value determination method, comprising the following steps:

[0030] Prepare the solution before preparing the solution. Wash the glass bottle, the magnet of the stirring device, the measuring cylinder, the beaker, the alkaline burette, the glass bottle stopper, etc. repeatedly with distilled water for 3 to 5 times, and dry them for later use.

[0031] Step 1: Add 9500ml methanol solution with a content of 99.9% to the glass bottle, then add 400ml high-purity water and 0.8ml, 0.5mol / L sodium hydroxide solution to the methanol solution, use 2 to 3 magnets to put Stir in a glass bottle with a magnetic stirring device, and stir for the first time for 8 hours to make a methanol solution of sodium hydroxide;

[0032] Step 2: leave the methanol solution of sodium hydroxide in step 1 open for 12 hours at room temperature;

[0033] Step 3: Stir the methanol solution of sodium hydroxi...

Embodiment 2

[0036] This embodiment provides another method for preparing a blank solution in the polytetrahydrofuran base value determination method, which includes the following steps:

[0037] Prepare the solution before preparing the solution. Wash the glass bottle, the stirring rod of the stirring device, the measuring cylinder, the beaker, the alkaline burette, the glass bottle stopper, etc. repeatedly with distilled water for 3 to 5 times, and dry them for later use.

[0038] Step 1: Add 9500ml of methanol solution with a content of 99.9% to the glass bottle, then add 400ml of high-purity water and 0.8ml, 0.5mol / L sodium hydroxide solution to the methanol solution, put the stirring rod into the glass bottle and use the stirring device Stir, make the methanol solution of sodium hydroxide through first stirring 8h;

[0039] Step 2: leave the methanol solution of sodium hydroxide in step 1 open for 12 hours at room temperature;

[0040] Step 3: Stir the methanol solution of sodium hyd...

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Abstract

The invention provides a method for preparing a blank solution in a polytetrahydrofuran base value determination method, comprising the following steps: Step 1: Add 9500ml of methanol solution with a content of 99.9% in a glass bottle, then add 400ml of distilled water into the methanol solution, add 0.8ml of 0.5mol / L sodium hydroxide solution, stirred for the first time for 8h to make a methanol solution of sodium hydroxide; step 2: leave the methanol solution of sodium hydroxide in step 1 at room temperature; step 3: The methanol solution of sodium hydroxide in step 2 was stirred for the second time, and the bottle was capped to obtain a methanol blank solution of sodium hydroxide, which was set aside. Using the blank solution in the determination of the base value of polytetrahydrofuran prepared by the invention reduces the number of determinations of the blank solution, improves the accuracy of the determination of the base value of polytetrahydrofuran, and improves the qualified rate of finished products of polytetrahydrofuran.

Description

technical field [0001] The invention relates to the technical field of detection methods for polytetrahydrofuran, in particular to a method for preparing a blank solution in a polytetrahydrofuran base value determination method. Background technique [0002] Polytetrahydrofuran, also known as polytetrahydrofuran diol, polytetramethylene ether glycol, polytetramethylene glycol, polybutylene glycol ether, polybutylene ether, is a kind of polytetrahydrofuran easily soluble in alcohol, ester, ketone, aromatic hydrocarbon And chlorinated hydrocarbons, white waxy solid insoluble in aliphatic hydrocarbons and water, polytetrahydrofuran is a white solid at room temperature, it becomes a colorless transparent liquid after melting, and becomes a transparent liquid when the temperature exceeds room temperature. Polytetrahydrofuran can be used in many industries such as clothing, medical treatment, and machinery manufacturing, such as tires, transmission belts, gaskets, coatings, artifi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N31/16
Inventor 封建利高立东边利利孟茸茸孙娟李海侠
Owner SHAANXI SHANHUA COAL CHEM IND GRP
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