What about latex paint lumps? What should I do if the wall paint cracks and deforms?

If you haven't seen a customer come to complain with a bucket of latex paint, you must still be a rookie in the paint industry for those who have seen all sorts of paint problems.
For paint dealers, paint is the most prone to problems before, during and after the sale, storage, construction, 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 it together!
the precipitation and lumping phenomenon of coatings
defined
the phenomenon of solid parts sinking to the bottom of the container during storage, called precipitation, also known as subsidion or subsidion .
when the precipitation phenomenon is serious, particles such as pigments in the coating 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
(1) in the design of paint formulations, consider the appropriate yanji ratio, the general yanji ratio should not exceed 2:1, except for special varieties. Pigment fillers as far as possible 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 densities are larger, less or as appropriate with low-density pigment replacement.
(2) paint viscosity can not be too low, the selected pigments can not react with each other. Such as zinc powder, aluminum powder, zinc oxide and other more lively, in the storage of poor stability of the paint as far as possible not to use or sub-tank packaging. In the production of coatings, the use of suitable equipment, as far as possible grinding dispersion, to achieve the specified viscosity, fineness.
(3) 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-sinking agents are stingric acid series, gas-phase silica, modified benthic soil, hydrogenated castor oil and so on. There are many varieties of imported anti-sinking agents, generally add 0.1%-0.5%, can prevent precipitation, and add 2%-3%, the paint can be made into a denatured coating, forming a higher film thickness.
dealer
(1) paint storage should be placed in a cool and ventilated place, 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.
(2) For precipitated coatings, they can be stirred evenly by hand or mechanically 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?
cause of cracking and deformation of wall coatings
1
the surface is unclean and contaminated with oil, moisture 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 containing medium paint resulting in no obvious bite or even paint cracking;
4
primer is painted before it is dry, or the first layer is too thick, and the second layer is painted without drying, making the two coatings inconsequentated.
5
cement bottom is not sufficiently dry, PH value is too (too alkaline).
6
construction environment is bad, the temperature is too low, the temperature difference is large, the humidity is large, the paint film is affected by the action of hot and cold and telescopic, 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 layer is dry and then coated with the next paint.
4. Cement bottom to be fully dry, PH value control below 8, preferably closed with anti-alkali primer.
. 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.