What's with the paint lumps?

For paint dealers, paint is the most prone to problems in the link is sales, storage, construction before, after, and these problems usually do not appear in the usual order, often hit the industry those new "apprentices" and in the paint sales industry crawled and rolled out 3-5 years of "old hands" caught off guard. Light people can also spend a little money to deal with, heavy people will most likely cause themselves a large area of internal injury!
how to avoid the risks, the editor believes that the most important point is "learning, learning, learning"! (The important thing to say three times) to find out the nature of the paint, in order to use for me!
next
let's analyze the
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the precipitation and lumping phenomenon of coatings
defined
during storage, the solid parts of the coating sink to the bottom of the container phenomenon, called precipitation, also known as subsidion or subside.
when the precipitation phenomenon is serious, particles such as pigments in the paint are precipitated into dense lumps that are not easily dispersed by stirring methods, called lumps .
phenomenon
when the paint opens the barrel, with a mixing stick inserted into the paint bucket, lifted, if the adhesive paint color consistency is the same, there is no precipitation phenomenon.
if the upper and lower thick, the bottom has a hard-to-stir feeling, that is, precipitation occurs.
when the mixing stick can not be inserted into the bottom of the barrel, the bottom precipitation hard knot, can not be stirred evenly, the appearance of lumps.
common precipitation paint varieties are: red Dan paint, anti-fouling paint, anti-rust paint (such as mica iron oxide anti-rust paint), low-performance latex paint.
causes
1, the pigment used is not fine grinding, poor dispersion, in the formula, the pigment ratio is too large, pigment density and other factors easily cause precipitation.
2, due to the addition of too many thinners, paint viscosity is low, paint lost the normal surface suspension state, pigment fillers produce precipitation.
a chemical polymerization reaction or mutual adsorption between the pigment and the resin, causing the gel to precipitate.
4, storage time is too long, beyond the retention period of the coating, especially long-term stationary placement. Color paint storage time is too long, pigment filler due to high density, at the bottom of the charge to form precipitation, and eventually form a hard knot. Some resins also go bad.
5, storage temperature is too high, the storage temperature of general coatings in 15 to 25 degrees C is appropriate. At more than 30 degrees C, the suspension properties of certain pigments and resins in the paint are destroyed, reducing the viscosity of the coating and precipitated into clinging blocks.
measures
manufacturers
01
design paint formula
in the design of paint formulations, consider the appropriate yanji ratio, the general yanji ratio should not exceed 2:1, except for special varieties. Paint fillers try to choose a smaller density, some pigments such as red dan powder, chromium yellow, mica iron oxide, iron red, precipitation of radon sulfate and other density are larger, less or as appropriate with low density pigment replacement.
02
viscosity
in the design of paint formulations, consider the appropriate face-based ratio, the general face-based ratio should not exceed 2:1, except for special varieties. Paint fillers try to choose a smaller density, some pigments such as red dan powder, chromium yellow, mica iron oxide, iron red, precipitation of radon sulfate and other density are larger, less or as appropriate with low density pigment replacement.
03
degeneration coating
adds a sinking agent to the coating, using the special properties of a small number of additives to make a denatured coating, change the paint suspension state. Commonly used anti-sink agents are stingric acid series, gas-phase silica, modified benthic soil, hydrogenated castor oil and so on. There are many varieties of imported anti-sink agents, generally add 0.1%-0.5%, you can prevent precipitation, and add 2%-3%, you can paint into a tentacleance coating, forming a higher film thickness.
dealers
01
coating storage
paint storage should be placed in a cool ventilation area, regularly put the paint bucket horizontal, upside down or shake several times. Pay attention to the storage period of the coating, the first use of the first storage. Be especially careful with some coatings with low storage life, such as chlorinated rubber, vinyl chloride, polyurethanes.
02
the use of precipitated coatings
for precipitated coatings, can be used by hand or mechanical stirring evenly before use. For the lump phenomenon, the flowable part should be poured out first, with a scraper from the bottom of the container to shovel the precipitation, shredding, and then the flow medium back into the original bucket, fully mixed.
wall paint is an essential type of chemical products in the modern home decoration process, generally there will be primers and finishes. High-quality wall paint can add a lot of color to the whole home decoration, but if the quality of wall paint is not off, or the construction quality is not off will make the surface of the wall paint cracking deformation phenomenon. So, what about cracking and deforming the wall paint? And how to avoid cracking and deformation of wall paint?
the reason for the cracking and deformation of the wall paint by entering the title
1. The surface is unclean and contaminated with oil, water or dirt.
2. The bottom surface is too smooth, the bottom polishing is not sufficient or not polished, such as the bottom layer with polyester paint, because of its high hardness, good gloss, good feel, not enough polishing, as in the glass paint, naturally lead to poor adhesion between layers, peeling;
3. Primer does not match or poor matching, such as with polyester paint, not enough polishing, with nitro foundation and nitro paint is not fully dry on the use of a relatively large number of strong solvents in the paint resulting in no obvious bite or even paint cracking;
4. The primer is painted before it is dry, or the first layer is too thick, and the second layer of paint is reapplyed without drying, making the two coatings inconsequentatable.
5. The cement base is not sufficiently dry and the PH value is too (too alkaline).
6. The construction environment is bad, the temperature is too low, the temperature difference is large, the humidity is large, the paint film is stretched by the action of hot and cold, causing cracking
.
how to avoid cracking and deformation of wall coatings
1. Oil, moisture or other dirt should be completely removed when the substrate surface is treated.
2. Choose the matching primer and finish.
3. The bottom is dry and then coated with the next paint.
4. Cement bottom to be fully dry, PH value control below 8, it is best to use anti-alkali primer closed.
5. Construction in an appropriate environment.
wall decoration is the face of the whole room project, wall paint quality directly affects the effect of the whole home decoration, related to whether the home decoration effect is more beautiful, more beautiful.