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Method for detecting epoxy equivalent weight

A detection method and epoxy equivalent technology, which can be used in material analysis by observing the influence of chemical indicators, and by chemical reaction of materials, etc., can solve the problem of unfavorable epoxy resin synthesis reaction termination point control, affecting turbidity. Point judgment, narrow application range and other problems, to achieve the effect of shortening the dissolution time, short detection time, and wide application range

Inactive Publication Date: 2013-10-30
CHONGQING POLYCOMP INT
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The disadvantage of the hydrochloric acid-acetone method is that it is more suitable for the detection of epoxy resins with a molecular weight below 1500. The epoxy resins with a molecular weight of more than 1500 will appear turbid due to poor sample dissolution effect, which will affect the judgment of cloud point; in order to avoid this situation , usually need to place the sample for about 1h, so the scope of application of this method is narrow, and the detection time required for the epoxy resin with a molecular weight exceeding 1500 is long, which is not conducive to timely control of the termination point of the epoxy resin synthesis reaction

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  • Method for detecting epoxy equivalent weight

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Embodiment 1

[0061] 1. Pipette 300ml of butanone, 100ml of absolute ethanol and 20ml of hydrochloric acid and mix them into a brown volumetric flask to obtain a hydrochloric acid-ethanol-butanone solution for later use;

[0062] 2. Heat PEG300 in an oven at 105°C, measure 50ml of PEG300 solution at 100°C with a measuring cylinder, and pour it into a conical flask;

[0063] Weigh 0.5-2g of the compound containing epoxy groups into 50ml of hot PEG300, shake well and dissolve, then rinse the outer wall of the Erlenmeyer flask with cold water to cool;

[0064] 3. Add 4-6 drops of phenol red to the mixed solution obtained in step 2, pipette 20ml of hydrochloric acid-ethanol-butanone mixed solution into the sample to be tested, and shake for one minute;

[0065] Before titration, add 2ml of distilled water, titrate with 0.5mol / L NaOH standard solution, titrate until the solution is dark reddish brown, record the consumption volume of NaOH standard solution as V 1 ml;

[0066] 4. Add 4 to 6 dro...

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Abstract

The invention provides a method for detecting an epoxy equivalent weight. The method comprises the following steps of: (a) uniformly mixing butanone, ethanol and hydrochloric acid to obtain a hydrochloric acid-ethanol-butanone solution; preheating polyethylene glycol to 100-110 DEG C, adding an epoxy compound, dissolving and cooling to obtain a sample solution to be detected; (b) adding the hydrochloric acid-ethanol-butanone solution to the sample solution to be detected, and vibrating; and (c) titrating the mixed solution obtained in the step b by using a sodium hydroxide standard solution till the solution is neutral, and calculating the epoxy equivalent weight according to the use amount of the sodium hydroxide. The method for detecting the epoxy equivalent weight, provided by the invention, has the characteristics of wide application range, short detection time, accurate result and capability of controlling the end point of an epoxy resin synthetic reaction in time.

Description

technical field [0001] The invention relates to the field of epoxy resins, in particular to a method for detecting epoxy equivalent. Background technique [0002] Epoxy equivalent refers to the number of grams of epoxy resin containing one equivalent of epoxy group, and the unit is g / mol. Epoxy equivalent is a very important indicator for the use and quality control of epoxy resin adhesives, potting agents, and composite materials. In addition, epoxy resin is also the basis for determining the amount of curing agent required for epoxy resin and the termination point of epoxy resin synthesis reaction. [0003] At present, there are many methods for measuring epoxy equivalent. The most common method in the world is the perchloric acid method, which is suitable for various epoxy resins and has high versatility, but the operation process is cumbersome. In addition, there are hydrochloric acid-acetone method, hydrochloric acid-pyridine method and hydrochloric acid-dioxane metho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/79
Inventor 龙浩王乐
Owner CHONGQING POLYCOMP INT
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