Silicone-modified acrylic emulsion
ACRYSET™ CE-518 / CE-553
A primer for civil engineering and construction refers to a preparatory material that is applied to the surface of a substrate, such as concrete, before the application of finishing materials like paint or self-leveling compounds.
Primers are used to regulate the water absorption of concrete substrates, reinforce weak areas of the surface, and ensure stable adhesion with finishing materials and self-leveling compounds. They also suppress the upward migration of strong alkaline components contained in the substrate, reducing the deterioration and performance decline of the finishing layer. By allowing moderate penetration into the substrate and forming a uniform film, primers help minimize construction irregularities and bubble formation, contributing to stable performance even under varying construction conditions.
By using a primer specifically for flooring applications, moisture absorption from the concrete substrate can be suppressed, allowing the construction materials to fully exhibit their inherent performance. Furthermore, the compatibility with the substrate improves, and the increased contact area enhances adhesive strength, resulting in a stable finish that is less likely to peel.
| Without a Primer | With a Primer |
|---|---|
| Water is absorbed into the substrate, causing poor curing (no reactive water available) | Water is present around the cement particles, increasing the bonding area to the substrate for sufficient curing. |
 |  Bond the substrate and mortar closely to enhance adhesion strength. The primer controls the water absorption behavior of the substrate surface, retaining the necessary moisture around the cement particles.  |
Primers for flooring materials used in civil engineering and construction are primarily employed to improve the quality of the flooring materials. They are designed to enhance the quality of flooring installation and to create floors that are resistant to various deterioration factors.
The silicone-modified acrylic emulsions ACRYSET CE-518 and CE-553 are formulated as primers for mortar and self-leveling materials (SL materials). Due to the ingenuity in resin design, it is expected to appropriately control permeability to the substrate while improving adhesion and durability. The monomer compositions of CE-518 and CE-553 differ, with designed glass transition temperatures (Tg) of -12°C and -21°C, respectively.
| Product Name | Characteristics | Non-volatile matter (%) | pH | Viscosity (mPa・s)※1 | Monomer composition | Design Tg (°C) | Particle system (nm) | MFT (°C) | Freeze-thaw stability *2 |
|---|---|---|---|---|---|---|---|---|---|
| CE-518 | white liquid | 18.0 | 8.4 | 4 | St/Ac | -12 | 120 | 2 | Good |
| CE-553 | white liquid | 45.5 | 8.2 | 60 | Ac | -21 | 140 | 0 | Good |
Good adhesion was confirmed in water resistance, freeze-thaw resistance, and hot alkaline water resistance tests.
The adhesion strength was evaluated in accordance with the Standard Specification M-101 of the Society of Finishing Technology of Japan.
CE-553 exhibits stable adhesion strength even when the application rate varies or under temperatures ranging from low to high.
| Test No. | Test conditions |
|---|---|
| 1 | standard |
| 2 | Amount of application: half |
| 3 | Application amount: double |
| 4 | Reduction of drying time |
| 5 | Low temperature environment (3°C) |
| 6 | High temperature environment (40°C) |
Cycle test under the following conditions (20 times)
Test results in a low-temperature environment (3°C)
| Cold (3°C) | |
|---|---|
| CE-553 | General-purpose acrylic emulsion blend |
 |  |
| Substrate destruction: ○ | Interface destruction |
Test results in a high-temperature environment (40°C)
| Hot (40°C) | |
|---|---|
| CE-553 | General-purpose acrylic emulsion blend |
 |  |
| Substrate destruction: ○ | Interface destruction |
