STD4019P Modified cellulose ether
Paint chemicals 2025-03-04
It is a high quality modified cellulose ether product developed for cement-based tile adhesive and plaster mortar applications, which can significantly improve the construction performance of tile adhesive.
Basic Properties
| Property | Description |
|---|---|
| Chemical Structure | Modified cellulose ether is derived from natural cellulose through etherification and cross-linking reactions. |
| Appearance | White to off-white powder, free-flowing. |
| Solubility | Soluble in water to form viscous solutions, with modified versions offering enhanced solubility characteristics. |
Performance Enhancements
| Property | Original Cellulose Ether | Modified Cellulose Ether |
|---|---|---|
| Water Retention | Good | Significantly improved, up to 17% higher with certain modifications |
| Mechanical Strength | Moderate | Increased, with flexural strength and compressive strength improved by 14.05% and 7.12% respectively |
| Viscosity | High | Further increased, leading to improved thickening properties |
Applications
| Application Area | Usage |
|---|---|
| Building Materials | Used in mortars to enhance cohesiveness, water retention, and workability. |
| Adhesives | Provides improved bonding strength and stability in adhesive formulations. |
| Coatings | Enhances the rheological properties and film-forming capabilities. |
Modified cellulose ether (STD4019P type) is a versatile material with enhanced properties compared to traditional cellulose ethers. Its improved water retention, mechanical strength, and viscosity make it suitable for a wide range of applications, particularly in construction materials and adhesives.
Fundamental Properties
| Property | Specification |
|---|---|
| Chemical Base | Hydroxypropyl methyl cellulose |
| Substitution Degree | 1.8-2.0 (Methoxy) |
| Molar Substitution | 0.2-0.3 (Hydroxypropyl) |
| Appearance | White to off-white powder |
| Particle Size | 80-120 μm (90% min) |
| Moisture Content | ≤5% |
| Ash Content | ≤2% |
Performance Characteristics
| Parameter | Test Method | Value |
|---|---|---|
| Viscosity (2% solution) | Brookfield, 20rpm | 40.000±5.000 mPa·s |
| Gel Temperature | Visual gelation | 60-65°C |
| pH (1% solution) | Potentiometric | 6.5-8.0 |
| Water Retention | DIN 18555-7 | ≥95% |
| Hydration Time (25°C) | Viscosity build-up | 8-12 minutes |
Application Guidelines
| Application | Dosage | Key Benefit |
|---|---|---|
| Tile Adhesives | 0.2-0.4% | Improved open time |
| Self-leveling Compounds | 0.1-0.3% | Controlled flow |
| Gypsum Products | 0.3-0.5% | Enhanced workability |
| Exterior Insulation Systems | 0.4-0.6% | Water retention |
| Cement-based Putties | 0.2-0.5% | Reduced cracking |
Key Features:
Delayed hydration for extended processing time
Pseudoplastic rheology for superior workability
Thermal gelation prevents sagging
Compatible with common construction additives
