Cellulose ether delamination is a common issue in coating production and storage. It often causes clear liquid on top and precipitation below when coatings stand. This problem harms construction leveling and coating uniformity, reducing adhesion and storage life.
It also increases costs and damages product reputation. The core cause is poor stable dispersion of cellulose ether, which fails to form an effective network for pigments and fillers. This article shares practical optimization methods to help resolve it quickly.

I. Core Causes of Delamination (Precise Investigation)

Delamination comes from three main aspects. Precise investigation is key to targeted solutions.
First, poor cellulose ether dispersion is common. Insufficient stirring or improper addition forms agglomerates. These agglomerates prevent molecular chains from unfolding into a stable network.
Second, improper selection or dosage mismatches the coating system. Low-viscosity products for high-pigment coatings lack suspension capacity. Both excessive and insufficient dosage cause delamination.
Third, unbalanced formulations or poor storage accelerate cellulose ether degradation. Abnormal pH and extreme temperatures damage system stability, leading to particle precipitation.

II. Core Optimization Methods (Implementable in 4 Steps)

1.Precise Selection: Prioritize non-ionic cellulose ethers (HPMC, HEC) for water-based coatings for better compatibility. Use high-viscosity products (above 20000mPa・s) for high-pigment thick pastes. Choose modified, high-dispersibility products to avoid agglomeration and delamination.
2.Standardized Process: Premix cellulose ether with talcum powder or light calcium. Slowly add the mixture to stirring base material to avoid “fish eyes”. Control stirring speed (800-1200r/min) and time (≥15min) for full dispersion. Avoid secondary pollution from equipment residues.
3.Formulation Optimization: Adjust coating pH to 6-8 (neutral). Add pH adjusters (e.g., AMP-95) to prevent cellulose ether degradation. Compound polyacrylic dispersants and fumed silica for synergy. Control solid content (40%-60%) and viscosity (5000-15000mPa・s).
4.Environment Control: Store coatings at 5-35℃ in sealed, cool, dry and ventilated areas. Avoid direct sunlight and high temperatures to prevent aging. Stir fully before use; slight delamination is fixable by stirring. Control construction temperature (10-30℃).

III. Key Misunderstandings and Summary

Avoid four key misunderstandings: Do not blindly increase dosage (it causes local gelation). Prioritize raw material compatibility to avoid incompatible additives. Standardize stirring to prevent insufficient dispersion. Manage storage to avoid recurrence. The core is “precise matching”. Optimize by “selection → process → formulation → environment” and establish standards. This solves delamination, saves costs and improves product quality.