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Analysis method for polyether polyol hydroxyl value

A technology of polyether polyol and analysis method, which is applied in the direction of material analysis through observation of the influence of chemical indicators, and analysis through chemical reaction of materials, etc., which can solve the problems of complex analysis steps, long detection cycle, and high cost , to achieve the effect of simple analysis steps, reduced experiment cost and good accuracy

Inactive Publication Date: 2013-04-17
SHANGHAI FALAB TEST
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Problems solved by technology

[0005] In order to solve the complex analytical steps of existing polyether polyol hydroxyl value, long detection period and high cost, the present invention proposes the following technical solutions:

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  • Analysis method for polyether polyol hydroxyl value

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Embodiment Construction

[0023] The preferred embodiments of the present invention are described in detail below, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and the protection scope of the present invention can be more clearly defined.

[0024] This embodiment respectively carries out 6 times of hydroxyl value analysis to two groups of samples S1 and S2 according to the following steps:

[0025] A. Weigh the sample m of polyether polyol in a 250ml ground conical flask, and take another empty conical flask;

[0026] B. Pipette 25ml of the pyridine solution of phthalic anhydride into the conical flask and the empty conical flask containing the sample respectively, and place the two conical flasks in a shaking oil bath at 120±3°C, then connect the Put on a 30mm air condenser and react for 1 hour;

[0027] C, until the end of the reaction, the two conical flasks are taken out from the oil bath, and placed in a room tem...

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Abstract

The invention provides an analysis method for polyether polyol hydroxyl value, which comprises the following steps: A, weighing a polyether polyol test sample m into a conical flask, and taking another empty conical flask; B, transferring a phthalic anhydride pyridine solution into the test sample accommodated conical flask and the empty conical flask respectively, placing the two conical flasks in an oscillation oil bath pan, and connecting the two conical flasks with an air condensation pipe for reaction; C, after reaction, taking the two conical flasks out of the oil bath pan for cooling; D, flushing the two conical flasks with deionized water and acetone in sequence, and oscillating the two conical flasks to mix the solutions completely; E, adding a sodium hydroxide aqueous solution into the two conical flasks respectively, and adding a few drops of phenolphthalein indicator; F, titrating the solutions in the two conical flasks with potassium hydroxide standard solution until the solutions in the two conical flasks changes into pink; and G, calculating out the polyether polyol hydroxyl value as per a formula. The method is simple in analysis procedure, has high precision and accuracy, can efficiently shorten detection period, lower experimental cost, and bring certain economical benefits to an enterprise.

Description

technical field [0001] The invention relates to a chemical detection and analysis method, in particular to a hydroxyl value analysis method of polyether polyols. [0002] Background technique [0003] The hydroxyl value is an important characteristic index of polyether polyol (hereinafter referred to as polyether). It involves the content of functional groups in polyether and the molecular weight of polyether, which is concerned by polyether production, application and development departments. In the polyether synthesis industry, the hydroxyl value is also used to control production, so such as the amount of feed, error analysis, and output estimation are all inseparable from the hydroxyl value. However, because the unit of hydroxyl value is not intuitive enough, it hinders people, especially beginners, from having a deep understanding and understanding of the meaning of hydroxyl value, so that in related calculations, the meaning of hydroxyl value itself is often discarde...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
Inventor 李静学颜景林郑海鹏
Owner SHANGHAI FALAB TEST
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