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Method used for rapid evaluation of stain resistance of coated plates, and special standard pollutant

A technology of contamination and contamination resistance, applied in the field of coatings, can solve the problems of poor contamination resistance data consistency, poor contamination resistance, and inability to evaluate real performance.

Active Publication Date: 2016-06-01
NIPPON PAINT CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The disadvantages of this method are: 1) The elemental composition of the regulated ash of artificial pollutants is completely different from the dust composition in the actual environment; 2) This method is to mix the ash and water, and then apply the mixture evenly with a brush On the surface of the coating film, it is completely different from the actual contamination situation outdoors; 3) For samples with high gloss (flatness) (the surface of the coating film is very flat), it is impossible to accurately evaluate the stain resistance, because the gloss is high during washing ( Samples with a very flat surface of the coating film will wash off all the ash, and its true performance cannot be evaluated); 4) The data obtained by this method are not consistent with the actual outdoor stain resistance data
[0008] From the above data, it can be known that the data obtained by using the GB method and the actual outdoor data for 6 months have a large difference in lightness value and reflectance%, and the consistency is also very poor. For example, the reflectance of ordinary paint No. 665 using the GB method % is 12, indicating that the stain resistance of the paint is the worst, but according to the actual outdoor data, the paint No. 631 is the worst, not No. 665, so there is a big error in the evaluation of the stain resistance of the paint , so that enterprises cannot correctly evaluate their product performance
[0009] According to the requirements of American ASTM standards, the test data must be obtained after 6 months of actual outdoor exposure. The disadvantage of this method is that it takes a long time to test to confirm the pollution resistance of the product

Method used

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  • Method used for rapid evaluation of stain resistance of coated plates, and special standard pollutant
  • Method used for rapid evaluation of stain resistance of coated plates, and special standard pollutant
  • Method used for rapid evaluation of stain resistance of coated plates, and special standard pollutant

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] Standard Pollutant Preparation

[0086] The following are pollutant samples taken from Chengdu, Shanghai, Langfang, and Guangzhou and the configuration ash specified in GB9780-2005. SEM-EDX elemental analysis of the samples was carried out and the results are as follows:

[0087] Table 2 SEM-EDX analysis results

[0088]

[0089] According to the analysis of SEM-EDX, the element range of the pollutants is set as follows, among which, the C element must be derived from the C element in the organic matter.

[0090] Table 3 Pollutant element distribution (at%)

[0091]

[0092] According to the elements of the set pollutants, the standard pollutants in Table 4 below are produced.

[0093] Table 4 Elemental Composition and Distribution of Standard Pollutants (at%)

[0094]

[0095] Among them, the composition of material A is shown in the following table 5, wherein, B44 is Rohm and Haas Company acrylic resin product model B44, NaCl, KCl, MgO and TiO 2 Use analy...

Embodiment 2

[0107] experiment method

[0108] 1. Test board

[0109] Material: 3 pieces of non-asbestos cement board (one piece is reserved)

[0110] Size: 4×150mm×70mm

[0111] pH value: The substrate needs to be de-alkalized first, and soaking treatment is required. The pH value of the solution after soaking is required to be between 7-8.

[0112] 2. Production of test samples (test substrates)

[0113] Paint according to the standard paint system as follows:

[0114] Flat coating: one primer + two top coats.

[0115] Metallic paint: one primer + one metallic paint + one finish varnish;

[0116] Coating method: flat coating with brush, each brush 140g / m 2 Prepare special effects and paint panels according to standard coating methods

[0117] Surface coating color: white, metallic paint with natural color;

[0118] Maintenance: dry at room temperature for seven days

[0119] 3. Test

[0120] 1) Using specified instruments, test the initial lightness value and reflectance value ...

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Abstract

The invention discloses a method used for rapid evaluation of stain resistance of coated plates, and a special standard pollutant. The method comprises following steps: the special standard pollutant is absorbed by a test base material; high moisture treatment, water spraying treatment, and heating treatment are carried out; and the change of lightness value and reflectivity is detected so as to detect stain resistance. The composition of the special standard pollutant is disclosed in the patent specification and patent claims. The special standard pollutant and the method are capable of realizing accurate rapid evaluation of stain resistance of test base materials such as exterior wall coating, and evaluation time on stain resistance is shortened greatly.

Description

technical field [0001] The invention relates to the field of coatings, in particular to a test method for quickly evaluating the pollution resistance of exterior wall coatings and special standard pollutants. Background technique [0002] Pollution resistance is a characteristic that is evaluated for coatings on building exterior walls, even if the coating formed by the coating is not easily polluted by the air. Regional environmental conditions (atmospheric environment) vary greatly. For some cities with developed heavy industry and mining industry, due to the large amount of dust and other suspended substances in the atmosphere, the coating that is susceptible to air pollution will lose the original decorative effect of the coating. , mainly manifested as blackening or darkening of the coating, which affects the appearance of the building, so for exterior wall coatings, its pollution resistance is very important. [0003] In GB / T9780-2005, the pollution resistance test is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/25G01N1/28
Inventor 宋凯佐藤弘一程金龙林惠赐矢本修平张丽燕
Owner NIPPON PAINT CHINA
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