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The selection of Chuangge Technology's SL-G2035 molecular sieve activated powder in polyurethane adhesives for aluminum honeycomb
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The selection of Chuangge Technology's SL-G2035 molecular sieve activated powder in polyurethane adhesives for aluminum honeycomb structures is primarily based on its chemical compatibility, moisture absorption performance, particle size distribution, process adaptability, and comprehensive performance advantages, which precisely address key challenges in polyurethane adhesive applications for aluminum honeycomb systems. Below is a detailed analysis:
1. Chemical Compatibility and Stability
- Polyurethane System Adaptability: SL-G2035 undergoes special surface treatment, ensuring high compatibility with polyurethane prepolymers (e.g., MDI- or TDI-based systems). Its inert surface prevents adverse reactions with isocyanate groups (-NCO), avoiding brittleness or degradation of the adhesive layer after curing, thus maintaining stable mechanical properties.
- Corrosion Resistance for Aluminum Honeycomb: Aluminum honeycomb structures are sensitive to acidic or alkaline substances. The chemical stability of SL-G2035 prevents residual substances in the adhesive from corroding the aluminum, extending the service life of the composite material.
2. High-Efficiency Moisture Absorption
- Rapid Water Removal: Polyurethane adhesives are highly sensitive to moisture, with trace amounts causing bubbles, voids, or incomplete curing. SL-G2035 features a high specific surface area (typically >800 m²/g) and uniform pore size distribution (e.g., 3A-type molecular sieves with ~0.3 nm pores), enabling rapid absorption of free water and ambient moisture. Its moisture absorption rate is 3–5 times faster than traditional desiccants like silica gel.
- Low Release Risk: Activated SL-G2035 does not release absorbed moisture during high-temperature curing, preventing internal stress concentration in the adhesive layer and ensuring defect-free bonding of aluminum honeycomb structures.
3. Optimized Particle Size and Dispersibility
- Micron-Scale Particle Design: SL-G2035 has a particle size distribution concentrated at 5–10 μm, matching the filler particle sizes (e.g., calcium carbonate, fumed silica) in polyurethane adhesives. This allows uniform dispersion in the adhesive, avoiding agglomeration-induced localized uneven moisture absorption or reduced adhesive strength.
- Low Sedimentation: Through surface modification, SL-G2035 exhibits excellent suspension stability in adhesives, minimizing sedimentation and stratification during storage and ensuring consistent application performance.
4. Process Adaptability and Cost-Effectiveness
- Low-Temperature Activation: SL-G2035 can be rapidly activated at relatively low temperatures (80–120°C), aligning with the curing processes of polyurethane adhesives (typically 100–150°C). This eliminates the need for additional high-temperature steps, reducing energy consumption and production costs.
- Controlled Dosage: A recommended addition of 1–3% by weight of the adhesive achieves optimal moisture absorption, offering a more cost-effective solution than traditional combinations of desiccants and antifoaming agents.
5. Comprehensive Performance Enhancement
- Improved Adhesive Toughness: The micro/nanostructure of SL-G2035 forms physical crosslinking points with polyurethane molecular chains, enhancing cohesive strength and peel resistance while absorbing moisture. This is particularly beneficial for aluminum honeycomb panels under dynamic loads (e.g., vibration, impact).
- Extended Adhesive Shelf Life: By continuously absorbing ambient moisture, SL-G2035 significantly prolongs the storage life of adhesives (typically by 30–50%), reducing degradation or gelation risks caused by moisture in prepolymers.
6. Technical Advantages of Chuangge Technology
- Customization Capabilities: Chuangge Technology tailors SL-G2035's pore size and surface treatment based on specific adhesive requirements (e.g., curing temperature, bonding strength), providing targeted solutions.
- Consistent Quality: Strict production controls (e.g., spray drying, high-temperature activation) ensure batch-to-batch consistency, meeting the high reliability demands of premium applications like aerospace and rail transit.
Application Case
In a high-speed train aluminum honeycomb floor project, polyurethane adhesives incorporating SL-G2035 achieved:
- Adhesive moisture absorption reduced to below 0.02% (national standard ≤0.1%);
- Peel strength between aluminum honeycomb and panels increased to 15 N/mm (25% higher than conventional solutions);
- Adhesive shelf life extended from 6 to 9 months, significantly reducing production waste.
Conclusion
Chuangge Technology's SL-G2035 molecular sieve activated powder stands out as an ideal choice for polyurethane adhesives in aluminum honeycomb applications due to its chemical compatibility, high-efficiency moisture absorption, process adaptability, and comprehensive performance optimization. It is particularly suited for industries demanding lightweight, durability, and reliability, such as aerospace and rail transit.
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Dalian Chuangge Technology Co., Ltd
Richard Han
Doris Zhou
Headquater: 9th Floor, Century Classic Building, No.10, Xinghai Square, Shahekou District, Dalian City, Liaoning Province
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