Briefly describe the advantages of redispersible latex powder?

Redispersible latex powder is a powder adhesive made from polymer polymer emulsion after spray drying. It is the main additive of cement-based or gypsum-based dry powder ready-mixed mortar. It has good dispersibility, high flexibility, High weather resistance, the same chemical properties as the initial emulsion.
The addition of redispersible latex powder to the dry powder can improve the bonding performance and cohesion of the material, have internal plasticization, increase the elasticity and bending strength of the material, and improve the impact resistance and weather resistance of the material. Various properties of mortar are improved, and different redispersible latex powders have different effects on the performance of dry powder mortar. Therefore, the redispersible latex powder is widely used in construction fields such as exterior wall insulation, ceramic tile bonding, interface treatment, gypsum bonding, interior and exterior wall putty, etc.
We all know that redispersible latex powder is commonly used in construction as a binder. So, what are the advantages of redispersible latex powder that so many construction sites can’t put it down?
1. The chemical properties are very important. In terms of water resistance, heat resistance and thermal insulation, it is not only in good agreement with some thermal insulation materials, but can even exceed them, so it is often used to bond some wall structures, adding its flexibility and Plasticity, I believe no construction site will be abandoned.
2. The redispersible latex powder is dispersed to form a film and play a reinforcing role as a second adhesive;
The protective colloid is absorbed by the mortar system (the film will not be destroyed by water, or “secondary dispersion”);
The film-forming polymer resin is distributed as a reinforcing material throughout the mortar system, thereby increasing the cohesion of the mortar;

Application of HPMC in tile adhesive

The effect of hydroxypropyl methylcellulose in tile adhesive mainly shows the following points. First of all, the amount of cellulose added is added and debugged along with the amount of cement. The addition of hydroxypropyl methylcellulose to the tile adhesive mainly increases the viscosity of the product, and the amount of hydroxypropylmethyl cellulose added also needs to be increased relatively. At the same time, if the tensile adhesive strength after immersion in water and the tensile adhesive strength after thermal aging will also increase slowly, the amount of cement at this time should also be relatively above 30%.

If the amount of hydroxypropyl methylcellulose in the tile adhesive is continuously increased, the increase in the tensile bond strength after the tile adhesive is immersed in water and after heat aging is very obvious. With the addition of cellulose, the adhesive strength of the tile adhesive they produce also changes accordingly. When adding cellulose, it is necessary to determine how much cellulose can play a real role in the application. The effect of cellulose in mortar is also very outstanding, which can make cement mortar produce better flexibility and tensile bond strength. Can make cellulose and mortar get a good combination, forming a continuous polymer film in the pores. It strengthens the bond between the base materials and blocks some of the pores in the mortar, which can improve the performance of the cement mortar.

Application of HPMC  in putty powder

With the use and understanding of hydroxypropyl methylcellulose (hpmc), I believe many friends know that putty powder will basically be added to it now. Today we need to understand the role of putty powder using hydroxypropyl methylcellulose.
Thickening: Can be thickened and suspended to make the solution uniform and anti-sagging.
Water retention: Putty powder dries slowly and assists calcium and calcium to react under the action of water.
Improve processability: Because the product has a lubricating effect, it can make the putty powder have a good structure. It does not participate in any chemical reaction, only plays an auxiliary role. Putty powder can add water to the wall. This is a chemical reaction. Due to the formation of a new substance, put putty powder on the wall of the wall, grind it into a powder, and then use it because it has formed a new substance (calcium carbonate). )) The main components of gray calcium powder are: Ca(OH)2, a mixture of CaO and a small amount of CaCO3, CaO + H2O = Ca(OH)2-Ca(OH)2 + CO2 = CaCO3 + carbon dioxide in water and air to form carbonic acid The effect of calcium, and HPMC is only to retain water and help gray calcium to respond better. It has not participated in any reaction itself.

Redispersible Polymer Powder(RDP)

Redispersible Polymer Powder(RDP) are manufactured by spray drying macromolecular copolymer dispersions under carefully defined conditions. They are mainly used to improve cohesion, adhesion and flexibility in constructions especially in drymix mortar.

Model No. RD12
Appearance flowing white powder
Particle size (mesh) 80
Bulk density ( kg/m³) 420-520
Solid content (%) min. 98
Ash content (%, 850℃) 12-20
pH value 5.0-8.0
Protective colloid polyvinyl alcohol
MFFT (℃)(1) 5
Tg (℃)(2) 0-4
Tile adhesives ★★★
Wall putty ★★★
External insulation and finish systems (EIFS) ★★★
Cement-based plasters ★★★
Self-leveling compounds ★★★
Tile grouts ★★★
Crack fillers ★★★
Masonry mortars ★★
Repair mortars ★★

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Hydroxypropyl MethylCellulose(HPMC)

HPMC (Hydroxypropyl MethylCellulose) is also called as hypromellose. HPMC (Hydroxypropyl MethylCellulose) products are derived from highly pure refined cotton and are specially made of etherification under alkaline conditions. They are completed under automated monitoring. HPMC (Hydroxypropyl MethylCellulose) products are ionic cellulose ethers. They are slightly off-white to beige odorless and tasteless powders in appearance.
HPMC (Hydroxypropyl MethylCellulose) products are used primarily in various construction materials like tile adhesives, cement mortar, cement renders, joint fillers, cement based plasters, self-leveling flooring compounds, external insulation and finish systems (EIFS) where it is used as a rheology modifier, thickener, binder, film former and water retention agent.

Model No. HPMC
Appearance slightly off-white to beige powder
Particle size (mesh) 80
Methoxy content (%) 27.1-32.0
Hydroxypropyl content (%) 4.0-12.0
Gelation temp. (℃) 55.0-65.0
Water retention rate (%) ≥90%
Ash content (%) ≤5.0
Weight loss on drying (%) ≤5.0
pH value 6.0-7.0