Proportion and preparation method of dry powder latex paint for interior wall

Formulation characteristics

The biggest advantage of the dry powder latex paint for interior walls formed by this product is that it is truly zero VOC and is a green industrial chemical.

The product obtained from this product is a solid powder, which can be packaged in paper bags like cement (in bulk when used in large quantities), eliminating the need for metal or plastic bucket packaging of liquid latex paint, which is convenient for transportation and long-term storage without deterioration.

The product obtained from this product is easy to construct, and can be applied by brushing, roller coating or spraying.

The product obtained from this product has high hiding power.

The product obtained from this product can be applied thinly, and the dry film thickness is 20~200pm.

The product obtained from this product is non-toxic, odorless, non-irritating to human skin and respiratory tract, and can be moved in immediately after construction.

Application field

• This product is mainly used in the surface finishing of indoor plaster walls, concrete, masonry buildings, gypsum, brick walls, wooden boards, asbestos boards, etc.
  
  

  Precautions

  The proportions of each component of this product are as follows: polymer latex powder 10-40, titanium dioxide 10-40, heavy calcium carbonate 10-40, calcined kaolin 5-20, talc 5-10, cellulose ether 0.

  
  

  The cellulose ether adopts one or more mixtures of methyl cellulose, carboxymethyl cellulose, ethyl cellulose, hydroxyethyl cellulose, and hydroxypropyl cellulose.

  
  

  The auxiliary agent is anionic polyurethane.

  
  

  The polymer latex powder in the above formula (parts by mass) is a high-molecular-weight polymer powder with a glass transition temperature of -10~5°C, which can be composed of a variety of acrylic (ester) monomers and methacrylic (ester) Acrylic polymer formed by copolymerization of monomers.

  
  

  It can also be vinyl acetate-ethylene copolymer, ethylene vinyl acetate-vinyl ester terpolymer powder, vinyl laurate vinyl chloride copolymer powder, etc.

  
  

  Vinnapas polymer latex powder of WACKER, etc.

  
  

  This product preferentially uses acrylic polymer latex powder containing self-crosslinking functional groups.

  
  

  The base material in the coating film can wet and cover the pigment particles more fully, thus improving many properties of the coating, such as scrubbing resistance, stain resistance, etc.

  
  

  Titanium dioxide is the most ideal white pigment commonly used in building fillers.

  
  

  Titanium dioxide is divided into two crystal types, rutile and anatase.
  Compared with anatase titanium dioxide, rutile titanium dioxide has better hiding power, weather resistance and lower oil absorption, but the latter has higher Low price, and the interior wall does not have high requirements for the weather resistance of the coating film.
  Therefore, the dry powder interior wall paint prepared by this product uses anatase titanium dioxide.
  

  Heavy calcium carbonate is a widely used and inexpensive filler, which plays a filling role and can also improve the leveling performance of the coating.
  

  The main component of kaolin is kaolinite, and the molecular formula is Al2O3 ●2SiOz●2H2O.
  It has good water resistance, acid resistance, alkali resistance, better chemical stability, and can improve suspension and prevent pigment settling.
  

  Improve the hiding power of titanium dioxide in coatings; it can increase the viscosity of latex coatings and improve the thickening stability of latex coatings, but its water absorption is large, and its alkali resistance is poor, and it is not suitable for the coating film that constitutes water repellency.
  

  The main component of talc powder is 3MgO●4SiO2 ●H2O, which is a hydroxyl complex.
  Since the magnesium atoms combined with oxygen in the talc powder form a layered structure between the two flake silicas, the adjacent layers are bonded together by weak van der Waals forces.
  

  When there is shearing force, the layers are easy to separate and have a slippery feel, so it can improve the leveling, improve the brushability of the paint, and prevent the pigment in the paint from precipitation and agglomeration.
  

  Talcum powder can also absorb the stretching stress of the film to avoid cracks and voids, thereby enhancing the strength of the film and improving the washing resistance.
  However, talcum powder is easy to pulverize and requires other ingredients to be combined with it.
  

  Cellulose ether is an effective thickener and rheological additive.
  Its thickening mechanism is that large cellulose molecules enter the aqueous phase of the dispersion medium to increase the viscosity of the water phase.
  This increase in the viscosity of the water phase comes from the strong cellulose molecules.
  Hydration and entanglement between molecules;

  At the same time, due to its water retention and film-forming properties, the drying speed of the coating film can be adjusted by changing the amount added to improve the film-forming properties.
  Can use methyl cellulose, carboxymethyl cellulose, ethyl cellulose;

  The addition of one or more mixtures of hydroxyethyl cellulose, hydroxypropyl cellulose, starch ether, etc.
  , will significantly increase the viscosity of the latex coating, but if the amount is too large, it will reduce the waterproof performance of the dry powder coating.
  

  The role of the solid defoamer is to inhibit the foam in the process of mixing the dry powder latex paint with water and eliminate the bubbles in the film forming process.
  The dry mixture containing defoamer can be wetted faster and more uniformly.
  Due to the elimination of foam, the additive avoids excessive shrinkage, porosity and other coating film defects in the application process.
  

  The additive is a high-molecular-weight hydrophobically modified anionic polyurethane powder, which functions as a dispersant, wetting agent and film-forming aid in traditional water-based latex coatings.
  It can not only improve the leveling of the coating.
  

  Increase the gloss of the coating film, increase the hiding power of the coating film, and improve the dispersion efficiency of pigments and fillers.
  In the film forming process, this multifunctional additive can first migrate to the surface of the coating film when the dry powder latex coating is formed to prevent excessive moisture.
  The evaporation.
  

  It acts as a plasticizer, which is conducive to the formation of a complete coating film and the improvement of coating film performance.
  However, the amount should be appropriate, too little will not achieve the purpose of helping to disperse and delay the evaporation of water, and too much will hinder the drying of the coating film.
  

  Colored pigments other than white pigments are indispensable for the preparation of colored dry powder latex coatings.
  The pigment gives the coating film a beautiful color, and at the same time improves the hiding power and weather resistance of the coating.
  Because the dry powder coating of this product does not use high-speed disperser to disperse in water mixing construction, it is difficult for general pigments to be completely dispersed uniformly.
  

  This product mainly selects inorganic pigments that are easy to disperse, with smaller particle size than ordinary pigments, large oil absorption, and strong hiding power and coloring power.
  Easily dispersible pigments are mainly easy to disperse iron oxide series pigments, such as iron oxide red and iron oxide yellow.
  Add different types and amounts of colored pigments according to customer requirements.
  

  The mechanism of this product for preparing interior wall dry powder latex coatings is: This product is based on the rheology of non-Newtonian fluids, the compounding of mixtures, and the orthogonal method of experiments on the basis of fully studying the compatibility of coatings.
  

  The film-forming polymer and latex particles with soft core-hard shell structural characteristics are selected, so that the film-forming polymer can be stored stably in a powder state, and the latex coating prepared at high glass transition temperature is plasticized by water It has good film-forming properties;

  Choosing cellulase and multifunctional additives can not only improve the rheological properties of dry powder latex paint after mixing with water, increase the gloss of the coating film, increase the hiding power of the coating film, and increase the efficiency of pigment and filler dispersion, but also multi-functional in the film forming process.
  Additives can still be used when dry powder latex coatings form films;

  It first migrates to the surface of the coating film to prevent the moisture from evaporating too quickly, thereby acting as a plasticizer, which is conducive to the formation of a complete coating film and the improvement of coating film performance; fillers with different characteristics are introduced into a system.
  

  Under the action of the selected polymer with moderate water-soluble type, good acid and alkali resistance, suitable redispersibility and strong adhesion, we have obtained the interior wall thousand-powder latex paint with performance that can meet various requirements.
  The coating film has excellent alkali resistance, water resistance and scrubbing resistance.
  

  Since this product is a dry powder latex coating, it is a true zero-VOC latex coating and a green chemical industrial product.
  At the same time, it eliminates more than ten chemical substances and additives in traditional latex coatings, saving a lot of resources;

  Dry powder latex paint is a solid powder, which can be packed in paper bags like cement (in bulk when used in large quantities), eliminating the need for metal or plastic bucket packaging of liquid latex paint; it is easy to transport and preserve without deterioration.
  

  Quality Index

  Item standard product

  • Low temperature stability: no deterioration
  • Workability: Two coats of brushing are barrier-free
  • Drying time (table thousand)/h: ≤2 ≤1
  • Appearance of coating film: normal
  • Contrast ratio: ≥0.
    93
  • Alkali resistance: 24h no abnormality 48h no abnormality
  • Scrubbing resistance/time: ≥1000 1200