A method for rapid detection of anti-pan-alkali effect of primer

Abstract

The invention relates to the field of emulsion paint quality detection, and especially relates to a method for rapidly detecting crystalline bloom resistance of priming paint effect. The method comprises the following steps: (1) a proper amount of color paste is added into the priming paint to be detected, and the priming paint to be detected is stirred, so that the color paste is uniformly dispersed; (2) a putty layer whose thickness scope is 2-4 mm is scraped on a test plate, and drying is carried out for 1-6 hours; after the putty is dried, the priming paint to be detected prepared in the step (1) of a certain thickness is painted by a roller or a brush on the putty layer of the test plate; (3) the test plate prepared in the step (2) which is coated by the priming paint to be detected is dried, and timing observation with naked eyes in the drying process is carried out and seepage degree is recorded; and multiple times of seepage degree value records are used for evaluating change trends of crystalline bloom resistance of the priming paint. The method conforms to real construction conditions and eliminates interference of finish on detection results, and at the same time trends of crystalline bloom resistance can be obtained.

Description

technical field [0001] The invention relates to the field of latex paint quality detection, in particular to a method for rapidly detecting the anti-pan-alkaline effect of a primer. Background technique [0002] The most common coating process of latex paint is: first scrape the putty (1-2 times), then roll the primer (1 time), and finally roll the topcoat (2 times). It can be seen that the primer is the transition layer between the putty (or cement mortar) and the topcoat, which has important functions such as strengthening the base material, sealing, and improving the adhesion of the topcoat. Building walls and putty are often rich in alkali and salt. If the anti-pan alkalinity of the primer is poor, the alkaline substance will penetrate into the surface of the topcoat, causing serious blooming of the coating film. [0003] At present, the detection of anti-pan-alkali of primers is mainly carried out according to the method described in "6.14 Anti-pan-alkaline" in JG / T 21...

AI Technical Summary

Problems solved by technology

[0004] ① This method uses fiber-reinforced cement medium-density flat plate as the test plate, 2% NaOH solution as the alkali source, and the color change of iron blue when it encounters alkali as an indicator, but the ability of 2% NaOH solution to penetrate the plate and then act on the primer is relatively low. Weak, often lead to no obvious change on the surface of the test plate for a long time, affecting the accuracy of the test results;

[0005] ② The alkali source and board used are inconsistent with the actual construction environment, so this method cannot effectively explain the anti-pan-alkaline performance of the primer product during actual construction;

[0006] ③The test cycle using this method is too long (at least 9 days), such a long test cycle will seriously slow down the progress of the experiment, making the new product development efficiency of the primer very low

[0008] The detection process is carried out with a topcoat, and the topcoat itself has a certain ability to resist alkali, which introduces a new influencing factor for the detection;

[0009] Because the process is tested with a topcoat, if the test result is efflorescence, it means that the primer must be efflorescence; however, if the test result is not efflorescence, it may be because of the primer The good pan-alkaline resistance may also be caused by an extra layer of topcoat, so it is not possible to directly draw the conclusion that the primer has good anti-pan-alkalization based on the test results, and the detected results are still not accurate enough