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Measuring method for acid value of unsaturated polyester resin emulsion

A technology of polyester resin and determination method, which is applied in the direction of chemical analysis by titration method, which can solve the problems of insoluble substances, human injury, and insufficient scope of application, so as to improve stability and accuracy, avoid human errors, and achieve good results. Solubility effect

Active Publication Date: 2017-01-11
JUSHI GRP CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. Health hazards: Toluene or pyridine is used as the solvent for dissolving samples, which is highly toxic. Inhaling the volatile gases of these solvents will easily cause harm to the human body
[0006] 2. Environmental impact: using toluene or pyridine as a solvent, it is difficult to treat the waste liquid after the test, and it is easy to pollute the environment
[0007] 3. The scope of application is not enough: using toluene-ethanol or pyridine-methyl ethyl ketone as a solvent, there is a possibility that some substances in the unsaturated polyester resin emulsion cannot be dissolved
But this invention application titration adopts indicator, judges the result according to the change of indicator color, still exists the interference of bigger thought factor; Simultaneously this invention application only uses acetone as solvent, can't make unsaturated polyester resin emulsion Dissolve completely into a colorless and transparent state

Method used

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  • Measuring method for acid value of unsaturated polyester resin emulsion
  • Measuring method for acid value of unsaturated polyester resin emulsion
  • Measuring method for acid value of unsaturated polyester resin emulsion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. Reagents

[0035] Propylene glycol methyl ether (analytical pure), acetone (analytical pure), potassium hydroxide (analytical pure), ethanol (95%), potassium hydrogen phthalate (standard), phenolphthalein indicator: 10g / L, carbon dioxide-free water ( For water quality above grade 3 in the laboratory, heat to boiling for 3 minutes, remove carbon dioxide in the water, and cool to room temperature).

[0036] 2. Instrument

[0037] Potentiometric titrator (Mettler T-50), electrode (Mettler DGI 113-SC), electronic balance (Sartorius BS224S), electric oven (SC101-3), 10ml alkaline burette, 100ml, poly Vinyl container (1000ml), brown ground bottle (1000ml)

[0038] 3. Solution preparation

[0039] 3.1 0.1mol / L potassium hydroxide-ethanol standard titration solution: configure and calibrate according to "Preparation of GB 601-2002 Chemical Reagent Standard Titration Solution".

[0040] 3.2 Preparation of mixed solvent: Pour 600 ml of acetone and 300 ml of propylene glyco...

Embodiment 2

[0067]Test the dissolving effect of mixed solvents in different proportions on the unsaturated polyester resin emulsion sample, and select the most suitable ratio therefrom. The results are shown in Table 2:

[0068] Table 2

[0069]

[0070]

[0071] From the perspective of dissolution effect, use a single solvent (only with acetone or only with propylene glycol methyl ether, the sample cannot be completely dissolved); 100 milliliters of mixed reagents with a ratio of 1:1 cannot completely dissolve 10 grams of samples; The amount of acetone and propylene glycol methyl ether used, when the ratio of acetone and propylene glycol methyl ether is 3:2, the sample begins to dissolve; when the ratio of acetone and propylene glycol methyl ether in the mixed solvent reaches 2:1, the solution reaches a colorless and transparent state. When the ratio of acetone to propylene glycol methyl ether in the miscible solvent reaches 4:1, the wall-mounted droplets are milky white, and some ...

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Abstract

A measuring method for the acid value of unsaturated polyester resin emulsion comprises the following steps that firstly, an unsaturated polyester resin emulsion sample and a mixed solvent are added into a titration cup of a potentiometric titrator and stirred fully for homogenization, and then a uniform colorless transparent solution to be measured is obtained, wherein the mixed solvent is prepared by mixing acetone and propylene glycol monomethyl ether in the volume ratio of (1-4):1; secondly, the potentiometric titrator is used, a proper acid base titration electrode is selected and steeped into the solution to be measured under stirring, a potassium hydroxide-ethyl alcohol standard titration solution is used for carrying out potentiometric titration, the milliliter quantity of the consumed standard titration solution when the end point is reached is recorded, a blank test is carried out with a mixed solution with the same volume, and the milliliter quantity of the consumed standard titration solution when the end point (a turning point of a titration curve) is reached is recorded; thirdly, the acid value of the unsaturated polyester resin emulsion is calculated. The method is good in operation safety, waste liquid is easy to treat, and the stability and accuracy of detection results can be improved.

Description

[0001] (1) Technical field [0002] The invention relates to a method for measuring the acid value of an unsaturated polyester resin emulsion. [0003] (2) Background technology [0004] At present, there is no national testing standard for the determination of the acid value of unsaturated polyester resin emulsion. The detection method mainly refers to "GB / T2895-2008 Determination of partial acid value and total acid value of plastics" to determine the acid value content in unsaturated polyester resin . There are following problems in the above detection method: [0005] 1. Health hazard: Toluene or pyridine is used as the solvent for dissolving the sample, which is highly toxic. Inhaling the volatile gas of these solvents will easily cause harm to the human body. [0006] 2. Environmental impact: Toluene or pyridine is used as a solvent, and it is difficult to treat the waste liquid after the test, which is easy to pollute the environment. [0007] 3. The scope of applicat...

Claims

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Application Information

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IPC IPC(8): G01N31/16
CPCG01N31/16
Inventor 张志坚钟升阳崔峰波陈建良崔丽荣杨东旭
Owner JUSHI GRP CO
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