Quantitative test method for whitening of coating film

A test method, coating technology

Inactive Publication Date: 2018-07-03
张琼之
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to design a good anti-water whitening coating, DOE (Design of Experiments) will be carried out on multiple factors such as the types and amounts of polymers, wetting and dispersing agents, thickeners, solvents, etc. Find the main influencing factors and the optimal dosage range, as the output "whitening" test results need to be quantitative, otherwise the DOE experimental data cannot be statistically analyzed, and the whitening test cannot be quantified, resulting in the problem of whitishness and turbidity. DOE to conduct research and experiments

Method used

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  • Quantitative test method for whitening of coating film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Test item: 8h water whitening resistance

[0028] Testing process:

[0029] Configure the sample paint of the coating film; in this step, the sample paint is container wood floor varnish, and the supplier is Shanghai Qinglan Wood Industry;

[0030] Prepare the prepared coating on a transparent glass plate with a 250 μm wet film maker to prepare a 250 μm wet coating film, and dry it at room temperature for 7 days before use;

[0031] Use a medium solution to test the water whitening resistance in some areas of the dried coating film, and then use a paper towel to dry the liquid on the surface of the coating film; in this step, use a 0-1000 μml microtube to measure 200 μml according to the GB / T9274 C method drop method Drip distilled water onto the coating film, drip 3-5 points, do parallel experiments, then cover the droplets with a petri dish or a transparent plastic cup, wait for 8 hours; dry the surface moisture of the sample with a paper towel;

[0032] Use a color...

Embodiment 2

[0036] Test item: 8h alkali water whitening resistance

[0037] Testing process:

[0038] Configure the sample paint of the coating film; in this step, the sample paint is container wood floor varnish, and the supplier is Shanghai Qinglan Wood Industry;

[0039] Prepare the prepared coating on a transparent glass plate with a 250 μm wet film maker to prepare a 250 μm wet coating film, and dry it at room temperature for 7 days before use;

[0040] Use a medium solution to test the water whitening resistance in some areas of the dried coating film, and then use a paper towel to dry the liquid on the surface of the coating film; in this step, use a 0-1000 μml microtube to measure 200 μml according to the GB / T9274 C method drop method Drop 5% sodium hydroxide solution on the coating film, drip 3-5 points, do parallel experiments, then cover the droplets with a petri dish or a transparent plastic cup, and wait for 8 hours; dry the liquid on the surface of the sample with a paper t...

Embodiment 3

[0045] Test item: 8h acid water whitening

[0046] Testing process:

[0047] Configure the sample paint of the coating film; in this step, the sample paint is container wood floor varnish, and the supplier is Shanghai Qinglan Wood Industry;

[0048] Prepare the prepared coating on a transparent glass plate with a 250 μm wet film maker to prepare a 250 μm wet coating film, and dry it at room temperature for 7 days before use;

[0049]Use a medium solution to test the water whitening resistance in some areas of the dried coating film, and then use a paper towel to dry the liquid on the surface of the coating film; in this step, use a 0-1000 μml microtube to measure 200 μml according to the GB / T9274 C method drop method Drop 5% hydrochloric acid solution on the coating film, drip 3-5 points, do parallel experiments, then cover the droplets with a petri dish or a transparent plastic cup, wait for 8 hours; dry the liquid on the surface of the sample with a paper towel;

[0050] U...

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Abstract

The invention discloses a quantitative test method for the whitening of a coating film. The quantitative test method comprises: S101: preparing the sample coating material of a coating film; S102: coating a film preparation base material with the prepared coating material to form a wet coating film, and drying so as to be spare; S103: carrying out water whitening resistance test on the partial region of the dried coating film by using a medium solution, and sucking the liquid on the surface of the coating film by using paper towel; S104: testing the brightness of the soaking region and the non-soaking region of the coating film by using a color difference meter, calculating the brightness difference between the two regions, carrying out statistical calculation based on the brightness difference, and evaluating the whitening degree of the coating film. According to the present invention, by quantifying the whitening degree and the white opacity degree into the brightness difference, thesevere degrees of the whitening behavior and the white opacity behavior are quantified into the easily-understood and measured values by measuring the brightness, such that the difference between thesamples having the close whitening degree and white opacity degree can be precisely measured and distinguished, the roughness and the wrong judgment due to the subjective grading are overcome, and the method has characteristics of simpleness, rapidness, precise measurement, excellent reliability and the like.

Description

technical field [0001] The invention relates to the field of coatings, in particular to a quantitative test method for whitening of coating films. Background technique [0002] "White" refers to the phenomenon that the paint film becomes cloudy and white when it encounters water or other chemicals during construction and after the film is formed. We often encounter the problem of whitening of the coating film, which will affect the decorative and protective functions of the coating film. [0003] In daily work, the water-whitening resistance of coatings is often tested, and raw materials with good water-whitening resistance are selected for coating production. The water-whitening resistance of coatings is closely related to the water-whitening resistance of raw materials such as polymers, wetting and dispersing agents, and thickeners used in the production of coating formulations. There is another factor that has nothing to do with the water whitening resistance of the pai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/25
CPCG01N21/25
Inventor 张琼之
Owner 张琼之
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