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Home   /   Product   /   Redispersible Powder

Redispersible Powder

LIWEI CHEMICAL CO. LTD

Redispersible Powder
Overview
PVA , categorized as a polyvinyl alcohol (PVA), is produced through an alcoholysis reaction and subsequent polymerization of vinyl acetate. This material manifests as a white, powdery substance, characterized by stability and non-toxicity, and it exhibits remarkable water solubility. When introduced to water at room temperature, it readily dissolves to create a stable colloid.
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Specifications

Item

Specifications

Apperance

White or yellowish powder

PH

5.0~9.0

Bulk Density,g/L

300~600

Solid Content,%

≥98.0

Burning residue,%

≤13

Mean particle size D50,μm

≤100

Drawing length,Mpa

≥6.0

Elongation at break,%

≥200

 

Packing & Storage

Packing In 25KG triple paper plastic composite bag or as per customer’s requirement.
Storage Store under 30℃ and moisture-proof environment.
Shipping Not regulated as dangerous goods.
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General Information

  Health Hazards FIRST AID
Inhalation According to the material form, it is not the normal way of contacting. Move victim into fresh air. If breathing is difficult, give oxygen and consult a physician immediately.
Skin No harm in general situation. No harm in general situation. First aid is not needed.
Eyes This product may cause temporary discomfort following direct contact with the eye. Rinse thoroughly with plenty of water for at least 15 minutes and consult a physician if feel uncomfortable.
Ingestion Accidental ingestion of the product may be harmful to the health of the individual. Never give anything by mouth to an unconscious person. Call a physician immediately.

 

Stability and Reactivity

Reactivity Contact with incompatible substances can cause decomposition or other chemical reactions.
Chemical stability Stable under proper operation and storage conditions.
Possibility of hazardous reactions Under normal conditions of storage and use, hazardous reactions will not occur.
Conditions to avoid Incompatible materials, heat, flame and spark.
Incompatible materials Avoid contact with oxidants, acids, alkalis.
Hazardous decomposition products Under normal conditions of storage and use, hazardous decomposition products should not be produced.
Safety Phrases None
RIDADR None
WGK Germany None
Packaging Group None
Hazard Class None
SYMPTOMS PREVENTION FIRST AID
Inhalation None None None
Skin None None None
Eyes None None None
Ingestion None None None
Frequently Asked Questions

What is Redispersible Latex Powder?

Redispersible powder, abbreviated as RDP, is a kind of powder that is physically re-dispersed after the spraying and drying of emulsion polymer and has good re-dispersibility and adhesion. When used, RDP needs to be mixed with water to form a latex liquid before application; it can be dispersed in water to form a film or adhesive.

What is Redispersible Latex Powder Mainly Used for?

The Re-dispersible powder has several important applications in the construction industry. It is used in a wide range of materials, such as mortars, plasters, self-leveling floors, and adhesives. Tile adhesives: Re-dispersible powder gives mortar excellent bonding strength, enabling tiles to be firmly adhered to the wall without falling off. Exterior Insulation Systems: In exterior insulation systems, Re-dispersible powder is used as a bonding mortar and screed to help the insulation material adhere firmly to the exterior wall, while improving the durability and insulation performance of the exterior wall. Self-leveling cement mortar: Self-leveling cement mortar made with Re-dispersible powder has good flow and flatness. It can be used for leveling floors and provides a high-quality construction base. Deformability and crack resistance: Re-dispersible powder has much higher deformability than cement stone rigid structures, effectively dispersing the effect of stress and improving the crack resistance of the mortar, thus improving the durability of the building. In addition, Re-dispersible powder is also suitable for seepage prevention, anticorrosion surface protection, and repair works of steel and reinforced concrete structures in water conservancy, harbor engineering, highways, bridges, metallurgy, chemical industry, industrial and civil buildings. Its specific applications include concrete reinforcement of building structures, waterproofing and leakage plugging of human defense facilities, anti-seepage treatment of reservoir dams and harbors, treatment of chemical corrosion protection buildings, concrete repair of road and bridge decks, as well as anti-seepage treatment of roofs, bathrooms and basements of industrial and civil buildings.

 

How Does Redispersible Latex Powder Work ?

Redispersible latex powder is a kind of powder binder made by spray drying of special emulsion (high molecular polymer). The powder can be quickly dispersed to form an emulsion after contact with water, and has the same properties as the initial emulsion, that is, a film can be formed after the evaporation of water, which has high flexibility, high weather resistance and high adhesion to various substrates.

 

What are the properties of Re-dispersible Powder?

Re-dispersible powder mainly has excellent re-dispersibility, bonding, deformability, and anti-cracking properties, as well as good processability and solubility. Re-Dispersibility: After drying, the latex powder can be re-dispersed in water to form a stable latex system. This system can be easily mixed with various building materials and achieve a uniform distribution in the application to give the best effect. Bonding: It can effectively bond different materials together, providing a strong adhesive force. This enables it to enhance the integrity and stability of materials in construction, coating, and other fields, improving construction quality and efficiency. Deformation capacity and crack resistance: Due to the structural properties of its internal components, latex powder has a higher deformation capacity than cement stone. This capacity effectively disperses stress and improves the mortar's crack resistance. This property is of great significance for improving the durability and extending the service life of buildings. Processability and solubility: it can be easily mixed with materials such as pre-mixed cement compounds, powder paints, or adhesives to form a homogeneous mixture, making it more flexible and versatile in its application and able to meet different construction needs.

 

How is Re-dispersible Powder produced?

The production process of Re-dispersible powders is relatively complex. Firstly, similar to Re-dispersible emulsion, a polymer emulsion needs to be synthesised through a polymerisation reaction. Then, the emulsion needs to be spray-dried or freeze-dried to remove the water from the emulsion and obtain the polymer powder. During this process, the drying conditions need to be precisely controlled to ensure the particle size, dispersibility and redispersibility of the polymer powder. Finally, the powder undergoes post-processing steps such as sieving and packaging to obtain the final Re-dispersible powder product.

 

How is Re-dispersible Powder packaged and stored ?

Packaging: Sealed in paper-plastic composite bag or kraft paper bag, generally 25kg/bag.
Storage: Store it in a dry, cool, and well-ventilated place; avoid direct sunlight and high temperatures. The temperature of the storage environment should be controlled between 5-35℃, and the relative humidity should be no more than 70% in order to prevent the latex powder from moisture or lumps.
Take care to avoid subjecting the product to heavy pressure or extrusion to prevent the bag from breaking or the latex powder from deforming. The stacking height should also be controlled to ensure the product's stability and safety.
The shelf life is usually about one year. During the storage period, the condition of the product should be checked regularly, and if lumps, discoloration, or odor are found, it should be treated or replaced in time.

 

What are the safety precautions for the use of Re-dispersible Powder?

Re-dispersible powder itself is a non-toxic, odorless, non-polluting, and environmentally friendly product.
However, if Re-dispersible powder is inadvertently inhaled into the respiratory tract, it may cause respiratory irritation or discomfort. Appropriate protective equipment such as masks and gloves should be worn when using Re-dispersible Powder, and the operating instructions in the product manual should be followed.
In addition, hazardous situations such as fire or explosion may occur under certain specific circumstances, such as exposure to high temperatures and sources of ignition, so ensure that the storage environment is away from sources of ignition and high-temperature areas.

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