RDP (Re-Dispersible Polymer Powder)

High flexibility, good film formation

High water resistance for increased open time

High hydrophobicity, ability to bridge cracks

Viscous texture and high workability

Excellent cohesion

High binding capacity

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Product Details

Redispersible polymer powder, also known as VAE Chemical or RDP Chemical, is a powder binder made from a special emulsion (high molecular polymer) spray-dried. The VAE/RDP powder can be quickly dispersed to form an emulsion after solving into water, and has the same properties as the initial emulsion, that is, a film can be formed after the water evaporates. This film has high flexibility, high weather resistance and good adhesion to various material, is an essential functional additive for dry-mix mortar.

Effect of VAE Chemical:

Improve the performance of the mortar, increase the strength of the mortar, increase the bonding strength of the mortar with various substrates, and increase the flexibility and deformability of the mortar, and compressive strength, flexural strength, abrasion resistance, toughness, adhesion and water retention capacity and workability.

As a leading VAE Chemical supplier, Haoshuo adopts advanced production technology and equipment from Germany, has 18 production lines, with a product quality rate of 100%, daily output can be up to 200 tons at now.

Moreover, we have a strong technical organization with the capabilities to maximize the benefits of cellulose ethers in your application. We offer technical assistance to our customers in products analysis, formulation optimization etc. We also provide high performance VAE chemical and construction grade HPMC for sale with low cost price. Welcome to contact us for detailed information!

Redispersible polymer powder, also known as redispersible emulsion powder, is a powder binder made from a special emulsion (high molecular polymer) spray-dried. RDP powder can be quickly dispersed to form an emulsion after solving into water, and has the same properties as the initial emulsion, that is, a film can be formed after the water evaporates. This film has high flexibility, high weather resistance and good adhesion to various material, is an essential functional additive for dry-mix mortar.

The addition of redispersible emulsion powder to the mortar can increase the cohesion and flexibility. First, RDP polymer can improve the water retention of the mortar, form a film, and reduce the evaporation of water. Second, redispersible polymer powder can improve the bond strength of mortar.

Dispersible polymer powder production process

• Dispersible polymer powders from HaoShuo are made by first suspending polymer particles (homopolymer or copolymer) in water and then spray drying them. This produces round powder-like agglomerates with a diameter of approximately 80 to 100 μm.

• Afterwards, a mineral anti-caking agent is added to produce a dry, free-flowing, and storable polymer powder, which is then stored in bags or silos.

• During the production of cement or gypsum mortar, the dispersible polymer powder is added to the mixing water and stirred until it disperses on its own. The aggregates then disintegrate and return to their smaller original molecules.

As one of the professional redispersible polymer powder manufacturers, HaoShuo has a strong technical organization with the capabilities to maximize the benefits of cellulose ethers in your application. We provide technical assistance to our customers in products analysis, formulation optimization etc.

Our factory adopts advanced production technology and equipment from Germany, has 18 production lines, with a product quality rate of 100%, daily output can be up to 200 tons at now.

We provide high quality RDP polymer powder and construction grade HPMC for your choice. Please feel free to select your interested products and contact us for the factory supply RDP powder price!

Use effect of dispersible polymer powder

• During the production of gypsum mortar, concrete or mineral cementitious materials such as cement, RDP powder is added to mixing water and subsequently redispersed.

• VAE redispersible powders can increase the flexural tensile strength, abrasion resistance and compressive strength of the material because the polymer modification reduces the water content in the cement. The reduction in water absorption caused by the polymer dispersion also makes mortar and cement more resistant to freeze-thaw cycles.

• When added to materials, redispersible powders maximize bond tensile strength, enhance elasticity and reduce porosity.

• Dispersible polymer powder can also be used to improve the performance of sealants, caulks, fillers, wallpaper adhesives, tile adhesives and exterior paints.

• RDP powders can significantly improve the processability of materials. Adding powder prior to hydration not only reduces the amount of water required for processing, it also simplifies handling and extends the time you can use the material.

• After curing, the material will bond better to the substrate and have more flexibility. Even without the addition of plasticizers, the cohesion between the various building components is stronger.

• Redispersible polymer powders provide tile adhesives with excellent adhesion and even form strong bonds with difficult substrates such as natural stone, wood and plastics.

Standard

Index Item	Standard Specifications
Appearance	White powder,free flowing
Solid content	≥98%
Ash content(wt%)	12±2%
Bulk density (g/l)	400~600
Average particle size(um)	90% pass 100 mesh
Ph value	6~8
Min. Film forming temperature℃	0~5
Glass transition temperature(tg)	-5±1

Advantages and Features

Features of Redispersible Emulsion(vae) powder:

● High adhesion and bonding strength

● Water resistance

● Good workability and rheology

● Improved flexibility and durability

● Increased impact and abrasion resistance

● Good freeze-thaw stability

Dispersible polymer powder(VAE/RDP) characteristics

• High flexibility, good film formation

• High water resistance for increased open time

• High hydrophobicity, ability to bridge cracks

• Viscous texture and high workability

• Excellent cohesion, on difficult substrates, with excellent bond strength after prolonged exposure to water

• High binding capacity, redispersible polymer powders are especially used in construction work to create durable adhesives and coatings for tiles, seals, conduits and pipes.

Application areas of VAE Chemical

Redispersible Emulsion powder is mainly used in interior and exterior wall putty powder, tile adhesive, tile jointing agent, dry powder interface agent, interior and exterior wall insulation mortar, self-leveling mortar, repair mortar, decorative mortar, waterproof mortar, etc.

● Mortar and grout: RDP powder is used in cement-based mortars and grouts to improve their adhesion, workability, and durability.

● Tile adhesives: VAE powder is added to tile adhesives to increase their bonding strength, water resistance, and flexibility.

● Exterior insulation and finishing systems (EIFS): RDP powder is used in EIFS to improve the system's flexibility, adhesion, and resistance to cracking.

● Self-leveling compounds: VAE powder is added to self-leveling compounds to enhance their workability and durability.

● Gypsum-based products: RDP powder is used in gypsum-based products to improve their water resistance, adhesion, and strength.

Packaging

Packaging and storage

Note: The product is packaged in polypropylene woven bags, each with a net weight of 25kg. When storing, place in a ventilated and dry place indoors, pay attention to moisture. Pay attention to rain and sun protection during transportation.

Quantity/20GP: 12 tons with pallets, 14 tons without pallets.

Quantity/40HQ: 24 tons with pallets, 28 tons without pallets.

FAQ

Regarding the relationship between viscosity and temperature in HPMC (HPMC viscosity), what should be noted in practical applications?

The viscosity of HPMC is inversely proportional to temperature, meaning that viscosity increases as temperature decreases. When we refer to the viscosity of a certain product, it generally refers to the measurement result of its 2% water solution at 20 degrees Celsius. In practical applications, in regions with large temperature differences between summer and winter, it is advisable to use relatively lower viscosity during winter for better construction. Otherwise, at low temperatures, the viscosity of the cellulose increases, resulting in a heavier feel during application. Medium viscosity: 75,000-100,000 (mainly used for putty) Reason: Good water retention. High viscosity: 150,000-200,000 (mainly used for polystyrene particle insulation mortar powder and foamed glass bead insulation mortar) Reason: High viscosity, reduces mortar dusting and sagging, improves construction. However, in general, higher viscosity provides better water retention. Therefore, many dry mortar manufacturers consider using medium-viscosity cellulose (75,000-100,000) instead of low-viscosity cellulose (20,000-40,000) to reduce the dosage and costs.
What are the differences between HPMC and MC?

MC stands for methyl cellulose, which is a cellulose ether made from purified cotton through alkali treatment using chloromethane as the etherification agent, followed by a series of reactions. The degree of substitution is generally 1.6-2.0, and different degrees of substitution result in different solubilities. It belongs to non-ionic cellulose ethers. 1. Methyl cellulose's water retention depends on the amount added, viscosity, particle size, and dissolution rate. Generally, a higher amount, smaller particle size, and higher viscosity result in better water retention. Among these cellulose ethers, methyl cellulose and hydroxypropyl methyl cellulose have higher water retention. 2. Methyl cellulose is soluble in cold water but has difficulty dissolving in hot water. Its aqueous solution is stable within the pH range of 3-12. It has good compatibility with starch, guar gum, and many surfactants. Gelation occurs when the temperature reaches the gelation temperature. 3. Temperature variation significantly affects the water retention of methyl cellulose. Generally, higher temperatures result in poorer water retention. If the temperature of the mortar exceeds 40°C, the water retention of methyl cellulose decreases significantly, which adversely affects the workability of the mortar. 4. Methyl cellulose has a noticeable impact on the workability and adhesion of mortar. "Adhesion" refers to the adhesion force between the worker's application tool and the wall substrate, i.e., the shear resistance of the mortar. A higher adhesion leads to higher shear resistance, requiring more force from the worker during application and resulting in poorer workability. Among cellulose ether products, methyl cellulose has a moderate level of adhesion. HPMC stands for Hydroxypropyl Methyl Cellulose. It is a non-ionic cellulose ether derived from refined cotton through alkalization, using epichlorohydrin and chloromethane as etherification agents in a series of reactions. The degree of substitution is generally between 1.2 and 2.0. Its properties vary with the ratio of methoxy content to hydroxypropyl content. (1) Hydroxypropyl Methyl Cellulose is soluble in cold water, but it can be difficult to dissolve in hot water. However, its gelation temperature in hot water is significantly higher than that of methyl cellulose. Its solubility in cold water is greatly improved compared to methyl cellulose. (2) The viscosity of Hydroxypropyl Methyl Cellulose depends on its molecular weight, with higher molecular weight leading to higher viscosity. Temperature also affects its viscosity, with viscosity decreasing as temperature rises. However, its viscosity is less affected by temperature compared to methyl cellulose. Its solution is stable when stored at room temperature. (3) Hydroxypropyl Methyl Cellulose exhibits stability in acids and alkalis, and its aqueous solution is highly stable within the pH range of 2 to 12. It is minimally affected by sodium hydroxide and lime water, although alkalis can accelerate its dissolution and slightly increase its viscosity. It demonstrates stability in general salts, but at higher salt concentrations, the viscosity of Hydroxypropyl Methyl Cellulose solution tends to increase. (4) The water retention capacity of Hydroxypropyl Methyl Cellulose depends on factors such as the dosage and viscosity, and at the same dosage, its water retention rate is higher than that of methyl cellulose. (5) Hydroxypropyl Methyl Cellulose can be mixed with water-soluble high molecular weight compounds to form homogeneous solutions with higher viscosity. Examples include polyvinyl alcohol, starch ethers, and plant gums. (6) Hydroxypropyl Methyl Cellulose exhibits higher adhesion in mortar construction compared to methyl cellulose. (7) Hydroxypropyl Methyl Cellulose has better resistance to enzymatic degradation compared to methyl cellulose, and its solution is less likely to undergo enzymatic degradation.
What are the formulations for interior and exterior wall putty powder?

1. Interior wall putty powder: Heavy calcium carbonate 800KG, light calcium carbonate 150KG (Starch ether, pure Qing, Peng run soil, citric acid, polyacrylamide, etc., can be added as appropriate). 2. Exterior wall putty powder: Cement 350KG, heavy calcium carbonate 500KG, quartz sand 150KG, latex powder 8-12KG, cellulose ether 3KG, starch ether 0.5KG, wood fiber 2KG.
What is the application of HPMC in putty powder, and what causes the formation of bubbles in putty powder?

HPMC has three functions in putty powder: thickening, water retention, and facilitating construction. It does not participate in any reaction. The formation of bubbles in putty powder can be caused by two reasons: (1) Excessive water content. (2) Applying another layer on top before the bottom layer has dried, which can also lead to the formation of bubbles.
What are the other names for Hydroxypropyl Methyl Cellulose (HPMC)?

Hydroxypropyl Methyl Cellulose, in English: Hydroxypropyl Methyl Cellulose, also known as HPMC or MHPC. Other names: Hydroxypropyl Methyl Cellulose; Cellulose Hydroxypropyl Methyl Ether; Hypromellose; Cellulose, 2-hydroxypropylmethyl Cellulose ether; Cellulose hydroxypropyl methyl ether; Hyprolose.
How to choose the appropriate hydroxypropyl methylcellulose (HPMC) for different applications?

For putty applications, a lower viscosity of 100,000 is sufficient, and good water retention is important. For mortar applications, higher viscosity of 150,000 is preferred. For adhesive applications, a high-viscosity, quick-dissolving product is required.
Why does hydroxypropyl methylcellulose (HPMC) have an odor?

HPMC produced using solvent methods uses solvents such as toluene and isopropanol. If the washing process is not thorough, there may be some residual odor.
What is the difference between the cold-water soluble type and the thermal soluble type of hydroxypropyl methylcellulose (HPMC) in the production process?

The cold-water soluble type of HPMC is surface-treated with formaldehyde, allowing it to disperse rapidly in cold water but not truly dissolve. It only dissolves when the viscosity increases. The thermal soluble type does not undergo surface treatment with formaldehyde. A higher dosage of formaldehyde results in faster dispersion but slower viscosity increase, while a lower dosage has the opposite effect.
Is there any relationship between powder loss in putty and HPMC?

The powder loss in putty is mainly related to the quality of the lime powder and has little to do with HPMC. Low calcium content in lime powder and an improper ratio of CaO and Ca(OH)2 in lime powder can both cause powder loss. If there is a slight relationship with HPMC, it would be that poor water retention of HPMC can also contribute to powder loss.
What is the relationship between the gelation temperature of hydroxypropyl methylcellulose (HPMC) and something else?

The gelation temperature of HPMC is related to its methoxy content. The lower the methoxy content, the higher the gelation temperature.