π§ͺ FORAWAD HEC | CAS 9004-62-0
A Technical Guide Based on FORAWAD Product Data
In the modern adhesive industry, water-based adhesives are preferred for their low VOC emissions and environmental compatibility. To achieve ideal application properties, storage stability, and bonding strength, formulators rely on high-performance additives. Hydroxyethyl Cellulose (HEC), a nonionic water-soluble polymer, has become an essential rheology modifier and functional additive for water-based adhesive systems.
This technical guide, based on product data from FORAWAD Co., Ltd (CAS: 9004-62-0), provides a detailed analysis of HEC's key advantages in adhesives, grade selection, and formulation strategies.
What is Hydroxyethyl Cellulose (HEC)?
According to FORAWADβs technical sheet, HEC is a nonionic water-soluble cellulose ether. It appears as a white to off-white powder, with 98% passing through a 100-mesh screen. Produced via hydroxyethylation (molar substitution MS 1.8β2.5), it offers excellent thickening, protective colloid effect, water retention, and rheology modification. Key properties include pH 5.0β8.0, residue on ignition β€0.5%, and moisture β€5.0%, ensuring stability and compatibility in complex adhesive formulations.
Core Functions of HEC in Adhesives (FORAWAD Application Data)
FORAWAD explicitly lists Adhesives as a key application area, covering wallpaper adhesives, latex adhesives, and plywood adhesives. The functionalities utilized are:
π 1. Thickening & Lubricity β Wallpaper Adhesives
Function: Increases viscosity and provides smooth lubricity for uniform coating.
Benefit: Prevents dripping on vertical walls and allows easy repositioning of wallpaper during installation.
π§ 2. Thickening & Water Binding β Latex Adhesives
Function: Binds water molecules through hydrogen bonding, slowing water penetration into porous substrates (wood, paper).
Benefit: Extends open time, keeping the adhesive layer wet for stronger bond formation.
βοΈ 3. Thickening & Solids Holdout β Plywood Adhesives
Function: Suspends fillers, pigments or solid particles uniformly.
Benefit: Prevents sedimentation, ensures consistent adhesive composition across plies, improving bond strength and durability.
FORAWAD HEC Grades: Selection Guide for Adhesives
FORAWAD offers both Standard (H) and Bio-grade (B) series. Bio-grade (B series) provides enhanced resistance to enzymatic degradation, ideal for adhesives stored for longer periods or exposed to contamination risks.
| Grade (H/B) | Viscosity (2% sol., NDJ, mPas) | Recommended Adhesive Application | Selection Rationale |
|---|---|---|---|
| HEC 300H / 300B | 240 β 360 | Low-viscosity spray adhesives, instant glues | Low shear viscosity, good flow & sprayability |
| HEC 6000H / 6000B | 4,800 β 7,200 | General latex adhesives, wallpaper pastes | Balanced thickening and leveling |
| HEC 30000H / 30000B | 24,000 β 36,000 | High-viscosity plywood / construction adhesives | High pseudoplasticity, anti-sag on vertical surfaces |
| HEC 60000H / 60000B | 48,000 β 72,000 | Sealants, joint fillers, paste adhesives | High yield value prevents slump, shear thinning for extrusion |
| HEC 100000H+ | β₯80,000 | Highly filled industrial adhesives, specialities | Maximum thickening & suspension power |
HEC vs. Other Adhesive Thickeners
Compared to HPMC or alkali-swellable thickeners, FORAWAD HEC offers distinctive benefits in waterborne adhesives.
| Characteristic | FORAWAD HEC | HPMC | Alkali-Swellable (ASE) |
|---|---|---|---|
| Ionic type | Nonionic | Nonionic | Anionic |
| pH sensitivity | Low (stable pH 5β8) | Low | High (needs alkali activation) |
| Electrolyte tolerance | Good | Moderate | Poor (viscosity drop with salts) |
| Water retention | Excellent | Excellent | Poor |
| Enzymatic degradation | Resistant grades (B series) | Lower risk | β |
| Emulsion compatibility | Excellent (no coalescence) | Good | May cause flocculation |
Formulation & Usage Recommendations
Based on FORAWAD product specifications, follow these guidelines for optimal results:
- Addition level: Typically 0.2% β 1.0% of total formula weight (depending on target viscosity).
- Dissolution method (preferred): Slowly add HEC powder to the water phase under high-speed stirring until fully dissolved (20β40 min), then add latex emulsion.
- Pre-dispersion alternative: Pre-mix HEC with propylene glycol or ethylene glycol before adding to water to avoid lumping.
- pH adjustment: For best hydration, adjust water phase to pH 6β8. FORAWAD HEC remains stable across pH 5.0β8.0.
- Preservation: For long-term storage, incorporate a suitable biocide, especially when using Bio-grade (B series).
Key Application Scenarios & Handling Benefits
HEC provides excellent slip and open time, prevents edge curling, and ensures strong adhesion to various wallpapers.
Superior water retention extends assembly time, leading to stronger wood bond lines and reduced glue waste.
Keeps fillers (calcium carbonate, flour) suspended, delivering uniform glue spread and improved bonding consistency across layers.
High yield value prevents slump in vertical gaps, yet offers easy extrusion; excellent for paintable formulations.
Storage & Packaging (FORAWAD Specifications)
FORAWAD HEC is packaged in three-layer paper bags with inner polyethylene liner, net weight 25 kg per bag. Store in a cool, dry warehouse, away from direct sunlight, moisture, fire, and rain. After opening, reseal tightly to prevent moisture uptake, which could affect dispersion quality.
β Conclusion
Hydroxyethyl Cellulose (HEC) is an indispensable rheology modifier and functional additive for high-performance water-based adhesives. Based on FORAWAD's application data, HEC significantly enhances wallpaper adhesives, latex adhesives, and plywood adhesives by providing four core functions: thickening, water retention, solids holdout, and lubricity. With a wide range of viscosity grades (300H to 100000H+) and bio-tolerant options, formulators can precisely tune rheological profiles, gaining a competitive edge in eco-friendly, waterborne adhesive markets.