Method for detecting content of acetic acid in polyvinyl acetate emulsion and copolymer thereof
A polyvinyl acetate and detection method technology, applied in the detection field, can solve problems such as poor accuracy, and achieve the effects of accurate acetic acid content, good repeatability, and small human error
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Embodiment 1
[0055] 1) Preparation of sodium hydroxide standard titration solution: Weigh 11g of sodium hydroxide and dissolve it in 100ml of carbon dioxide-free water, shake well, pour it into a polyethylene container, place it airtight until the solution is clear, measure 27ml of the supernatant with a plastic tube, and use Dilute to 1000ml with carbon dioxide-free water and shake well. Dissolve 0.36g of potassium hydrogen phthalate, a working standard reagent that was baked at 105°C to 110°C to constant weight, in 80ml of carbon dioxide-free water, add 4 drops of bromothymol blue indicator solution (1g / L), and use the prepared The sodium hydroxide solution was titrated until the solution changed from yellow to blue and kept for 30s. At the same time do a blank test.
[0056] The concentration [c(NaOH)] of sodium hydroxide standard titration solution, numerical value is expressed in mole per liter (mol / L), calculates by formula (1):
[0057]
[0058] In formula (1):
[0059] m - th...
Embodiment 2
[0074] Embodiment 2 repeatability evaluation
[0075] Using the method of Example 1, 3 different acetic acids were tested 3 times respectively, and the results are shown in Table 1.
[0076] Table 1 Example 2 Summary of Repeatability Evaluation Results
[0077]
[0078]
[0079] It can be seen from the data in Table 1 that the detection method provided by the present invention has three titration errors less than 5%, and the results are accurate, reliable and reproducible. When the content of acetic acid is low (<200ppm), it can also be determined more accurately.
Embodiment 3
[0080] Embodiment 3 solvent is analyzed to the influence of measuring result
[0081] Adopt the method for embodiment 1, with water and ethanol as co-solvent, drop indicator then, polyvinyl acetate emulsion and copolymer thereof are titrated, and the results are shown in Table 2 and figure 2 , figure 2 It is the titration diagram of the system after adding water-ethanol co-solvent, from left to right is the colorless and transparent solution after adding co-solvent, adding bromothymol blue system is transparent and yellow, titrated with sodium hydroxide standard solution until the system is transparent and turns blue.
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