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Rapid detection method of freeze-thaw stability of emulsion used for emulsion paint

A technology of freeze-thaw stability and latex paint, which is applied in the field of emulsion quality inspection for architectural coatings, can solve the problems of long inspection time and rapid inspection of unfavorable raw materials entering the factory, and achieve the effect of saving inspection time

Active Publication Date: 2013-10-23
SKSHU PAINT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The disadvantage of the current national standard detection method above is that the detection time is too long, at least 72 hours, which is not conducive to the rapid detection of raw materials entering the factory

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The method for quickly detecting the freeze-thaw stability of latex paint emulsions includes the following steps in sequence:

[0032] ① Weigh 200g of the emulsion to be tested and pour it into a hard plastic testing cup with a volume of about 0.3L;

[0033] ②Place the dispersing disc of the dispersing machine at 1 / 3 of the emulsion liquid level in the testing cup;

[0034] ③ Turn on the disperser and adjust the speed to 1000 rpm;

[0035] ④ Weigh 1.6g of hydroxyethylcellulose 250HBR and 0.5g of organic amine AMP95 and slowly add them into the test cup in sequence;

[0036] ⑤ When the viscosity of the emulsion in the test cup increases to an appropriate level (referring to when the vortex in the middle of the emulsion in the test cup disappears), increase the speed of the disperser to 1500 rpm, and start timing for 30 minutes;

[0037] ⑥Appropriately add water to the test cup under low-speed stirring at 400 rpm, so that the viscosity of the emulsion in the test cup dr...

Embodiment 2

[0040] The method for quickly detecting the freeze-thaw stability of latex paint emulsions includes the following steps in sequence:

[0041] ① Weigh 200g of the emulsion to be tested and pour it into a hard glass test cup with a volume of about 0.4L;

[0042] ②Place the dispersing disc of the dispersing machine 1 / 2 below the emulsion liquid level in the testing cup;

[0043] ③ Turn on the disperser and adjust the speed to 800 rpm;

[0044] ④Weigh 1.4g of hydroxyethylcellulose 250HBR and 0.4g of organic amine AMP95 and add them into the test cup slowly in sequence;

[0045] ⑤ When the viscosity of the emulsion in the test cup increases to an appropriate level (referring to when the vortex in the middle of the emulsion in the test cup disappears), increase the speed of the disperser to 1300 rpm, and start timing for 35 minutes;

[0046] ⑥Appropriately add water to the test cup under low-speed stirring at 300 rpm, so that the viscosity of the emulsion in the test cup drops to ...

Embodiment 3

[0049] The method for quickly detecting the freeze-thaw stability of latex paint emulsions includes the following steps in sequence:

[0050]① Weigh 200g of the emulsion to be tested and pour it into a hard plastic testing cup with a volume of about 0.5L;

[0051] ②Put the dispersing disc of the dispersing machine at a position 1 / 4 below the emulsion liquid level in the detection cup;

[0052] ③ Turn on the disperser and adjust the speed to 1200 rpm;

[0053] ④ Weigh 1.8g of hydroxyethylcellulose 250HBR and 0.6g of organic amine AMP95 and slowly add them into the test cup in sequence;

[0054] ⑤ When the viscosity of the emulsion in the test cup increases to an appropriate level (referring to when the vortex in the middle of the emulsion in the test cup disappears), increase the speed of the disperser to 1700 rpm and start timing for 32 minutes;

[0055] ⑥Appropriately add water to the test cup under low-speed stirring at 500 rpm, so that the viscosity of the emulsion in the...

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Abstract

The invention relates to a rapid detection method of freeze-thaw stability of emulsion used for emulsion paint. The rapid detection method comprises the following steps of: (1) weighing 200 parts of emulsion to be detected and pouring an emulsion into a detection cup; (2) placing a dispersion disk of a dispersion machine at a position 1 / 2-1 / 4 below the liquid level of the emulsion; (3) starting the dispersion machine, and adjusting the rotating speed to be 800-1200 revolutions per minute; (4) weighing 1.4-1.8 parts of hydroxyethyl cellulose and 0.4-0.6 part of organic amine, and adding the hydroxyethyl cellulose and the organic amine into the detection cup successively; (5) when the emulsion viscosity is increased to the appropriate degree, increasing the rotating speed of the dispersion machine to be 1300-1700 revolutions per minute and then timing for 30-35 minutes; (6) adding water into the detection cup under low-speed stirring to decrease the emulsion viscosity to be in an initial state; (7) stirring and observing whether abnormal phenomena such as hard lumps or flocculation exist in an object to be detected or not, if not, the emulsion to be detected is considered to have 'no abnormality', and the freeze-thaw stability of the emulsion to be detected is proven to be good. The rapid detection method can be used for greatly shortening the detection period simultaneously when ensuring the accuracy of detection results.

Description

Technical field [0001] The invention relates to the field of quality detection of emulsions used in architectural coatings, in particular to a method for quickly detecting the freeze-thaw stability of emulsions used in latex paints. Background technique [0002] In the national standard of the People's Republic of China—GB / T20623-2006 "Architectural Coating Emulsion" 4.7 "Freeze-thaw stability" this chapter records the following current international testing method: put 50g sample into about 100ml cylindrical plastic Or in a glass container, be careful not to mix air bubbles, and seal with a lid. Put it in a (-5±2)°C low temperature box. Take it out after 18h, and place it at (23±2)°C for 6h. After repeating this for 3 times, open the container and stir with a glass rod to observe whether there are any abnormal phenomena such as hard lumps and flocculation in the sample. If there is no abnormality, it is considered "no abnormality". After forming a uniform film, observe w...

Claims

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Application Information

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IPC IPC(8): G01N33/26
Inventor 洪杰王东南
Owner SKSHU PAINT
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