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.
