Tại sao bột trét lại nứt? Bột kỵ nước silicon của EASTCHEM có thể giúp ích như thế nào

Cracks in putty layers are a frequent issue in construction, impacting aesthetics and durability. They appear in several forms:

1️⃣ Large cracks form soon after drying.
2️⃣ Fine cracks emerge if walls remain unpainted for long.
3️⃣ Uneven cracking, where some areas crack while others don’t.

Each type has unique causes, requiring specific solutions. EASTCHEM’s Silicone Hydrophobic Powder (SHP) offers an effective way to prevent these issues and enhance putty performance.

Why Does Putty Crack?

Causes of Cracking

Cracks Right After Drying
These often stem from poor putty quality, with low early-stage crack resistance. Weak bonding strength and inadequate water repellency cause stress during drying, leading to large cracks.

Cracks After Delayed Painting
Putty contains cement and additives like redispersible polymer powder (RDP). Without prompt painting, moisture evaporates too quickly, hindering cement hydration. This causes shrinkage and fine cracks. Painting early retains moisture for curing, but without water-repellent properties, the putty remains prone to cracking.

Uneven Cracking on the Same Wall
This results from thick or uneven putty application. Thicker areas shrink more during drying, creating stress and cracks, while thinner areas may stay intact.

Prevention and Solutions

For Cracks Right After Drying
Use high-quality putty with EASTCHEM’s Silicone Hydrophobic Powder (SHP). This silane-siloxane-based additive enhances water repellency, reducing moisture-related shrinkage. Combining SHP with binders like RDP improves flexibility and bonding, minimizing cracks. Avoid ultra-fine fillers, which increase shrinkage.

For Cracks Due to Delayed Painting
Incorporate Silicone Hydrophobic Powder (SHP) to create a water-repellent barrier, slowing moisture loss. This ensures proper cement hydration, even if painting is delayed, reducing fine cracks. SHP’s vapor permeability prevents internal stress.

For Uneven Cracking
Apply putty in thin, even layers. Silicone Hydrophobic Powder (SHP) improves workability for smoother application and reduces water absorption, ensuring consistent performance across the wall.

Silicone Hydrophobic Powder (SHP)

EASTCHEM’s Silicone Hydrophobic Powder (SHP) is a high-performance, silane-siloxane-based additive that enhances putty and cement-based materials. It forms a hydrophobic film, preventing water penetration while allowing vapor to escape.

Key Benefits

• Water Repellency: Reduces water absorption by up to 90%, preventing cracks and efflorescence.

• Durability: Chemically bonds with cement for 5-10 years of protection against UV, alkali, and weathering.

• Workability: Easy to mix, ensuring uniform dispersion.

• Breathability: Allows vapor escape, preventing mold and damage.

• Eco-Friendly: VOC-free, environmentally safe.

Applications

• Putty and Coatings: Enhances crack resistance and weatherability.

• Waterproof Mortar/Grout: Prevents seepage in wet areas.

• Insulation Systems: Protects against moisture.

Usage Guidelines

• Dosage: 0.15%-0.35% by cement weight.

• Mixing: Blend with dry components before adding water.

• Storage: Keep sealed in a cool, dry place; use within 12 months.

How EASTCHEM Can Help

EASTCHEM’s Silicone Hydrophobic Powder (SHP) addresses putty challenges by:

• Enhancing crack resistance and bonding.

• Reducing shrinkage and managing moisture.

• Supporting uniform application and durability.

Contact us at www.eschemy.com for samples and tailored solutions to elevate your putty formulations.