Do You Understand the Role of Starch Ether in Mortar ...

Do You Understand the Role of Starch Ether in Mortar?

The Role of Starch Ether in Mortar

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1. Thickening the Mortar and Increasing Sag Resistance

For instance, in the application of tile adhesive, putty, and plastering mortar, which now often requires high fluidity due to mechanical spraying, starch ether is indispensable. In gypsum-based mortar, where machine spraying is utilized, starch ether mitigates severe sagging issues. The challenge between liquidity and sag resistance is addressed effectively as starch ether improves the sag resistance when fluidity increases. When an external force is applied, the mortar's viscosity decreases, enhancing workability and pumpability. Conversely, removing the external force increases viscosity, improving sag resistance and making it suitable for larger tile areas by enhancing tile adhesive slip resistance.

2. Extending Open Time

Specifically, starch ether meets the needs of special tile adhesives by extending their open time from 20 minutes to 30 minutes, reaching 0.5MPa.

3. Improving Surface Properties

Starch ether is significant for gypsum-based and cement mortars, providing a smooth and easy-to-apply surface, which has excellent decorative effects. This is important for plastering mortars and thin-layer decorative mortars like putty.

The Mechanism of Action of Starch Ether

When starch ether is dissolved in water, it disperses evenly within the cement mortar system. Due to its network structure and negative charge, it adsorbs positively charged cement particles. Acting as a transitional bridge, it connects the cement particles, giving the slurry a higher yield value, thereby enhancing anti-sagging and anti-slip properties.

Hydroxypropyl Starch Ether - HPMC

Hydroxypropyl Starch Ether

Hydroxypropyl starch ether (HPS) provides unique characteristics to cement and gypsum-based products. While it shares a similar chemical structure with Hydroxypropyl Methyl Cellulose (HPMC), it also exhibits excellent compatibility with other building additives. Using HPS and HPMC together provides a superior thickening effect, improved crack resistance, and ease of use, significantly reducing the cost of mortar formulations.

Properties of hydroxypropyl starch ether

• Possesses anti-sagging properties, improving anti-sagging performance and construction optimization;
• Prevents thick layer overhanging of mortar, reducing undesired tile slippage and thick layer overhanging issues;
• Delays opening time and maintains stable water retention with rising temperatures;
• Has a rapid thickening effect on mortar, improving the rheology of spraying and plastering mortar;
• Prevents mortar delamination/separation, ideal for use in self-leveling mortar.

Applications

• Tile adhesive-C2
• Wall mud (interior and exterior)
• Block joint mortar
• ACC bonding mortar
• Manufacture of glues and adhesives

Ding'ao Cellulose - Your Partner for Cement/Gypsum Based Dry Mortar Additives

As an established manufacturer of Hydroxypropyl Starch Ether in China, Kundu Chemicals collaborates to offer optimal Hydroxypropyl Starch Ether solutions for your requirements. Visit Ding’ao for a free quotation on Hydroxypropyl Starch Ether and related TDS/MSDS/COA information. Experience efficient service from Ding’ao.

Specifications

• Product Name: Hydroxypropyl Starch Ether
• Viscosity (5% aqueous solution): 1200±100mpa.s / 800~20000mpa.s
• Appearance: White powder
• Moisture: ≤5%
• pH Value (5% aqueous solution): 6 to 8 basic
• Hydroxypropyl Content: 18%~32%
• Solubility: Requires stirring to dissolve
• Fineness: 350µm
• Package: 25KG/bag kraft paper bag
• Storage: Store in a dry place to prevent moisture absorption
• Dosage Ratio: 0.03~0.05%/100kg for cement-based; 0.02~0.05%/100kg for gypsum-based; 0.03~0.05%/100kg for lime-based

Effects and Advantages

• Increases construction feel
• Enhances water-retaining properties
• Improves lubricity and sag resistance
• Increases fullness and wettability
• Enhances anti-sag properties and filling capabilities
• Rapid dissolving speed
• Even dispersion
• Quick effectiveness