Will HPMC affect the color rendering effect of pigments in colored decorative materials?

2025-11-01 11:30:35

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HPMC (Hydroxypropyl Methyl Cellulose) indirectly affects the color rendering effect of pigments in colored decorative materials through its own characteristics, with the core effects concentrated in three dimensions: dispersibility, stability, and physical state.

The core influence of HPMC on pigment color development

Dispersion determines color uniformity. HPMC, as a water-soluble polymer, has both thickening and dispersing effects in decorative materials such as coatings and putty. If the HPMC model is suitable (such as medium viscosity and appropriate degree of substitution), it can encapsulate pigment particles and prevent agglomeration, allowing the pigment to be evenly dispersed in the system, resulting in more uniform color development, no flower or color block phenomenon; If the viscosity of HPMC is too high or the amount added is too large, it will cause a decrease in the fluidity of the system, difficulty in dispersing pigments, and problems such as uneven color development and dull color; On the contrary, if the viscosity is low, the pigment cannot be effectively stabilized, and it is prone to delamination and color floating, which affects the consistency of color development.

Stability affects the color development persistence. The temperature and acid alkali resistance of HPMC indirectly affect the stability of pigments. In high temperature environments, low-quality HPMC is prone to degradation, leading to a sudden drop in system viscosity, loss of stable support for pigments, and possible migration or fading; In cement-based materials with strong alkalinity, HPMC needs to have a certain degree of alkali resistance, otherwise it will hydrolyze and become ineffective, unable to maintain the dispersed state of pigments, and is prone to fading and discoloration after long-term use. In addition, the water retention of HPMC can reduce pigment aggregation caused by rapid evaporation of water during material drying, avoiding local color darkening or lightening.

The addition of HPMC can affect the film-forming and surface state of decorative materials due to changes in their physical state and color appearance. Moderate HPMC can improve the flatness of the material after film formation, making the pigment appear fuller and the glossiness more uniform; If added in excess, it will cause the film layer to be too thick, the drying speed to slow down, and the surface is prone to shrinkage and sagging, indirectly causing uneven color development of the pigment; Meanwhile, HPMC has good transparency and does not cover the color of the pigment itself. However, impurities in low purity HPMC may introduce slight color differences, affecting the final color rendering effect.

Key control points for optimizing color rendering effect

To reduce the negative impact of HPMC on pigment color development, targeted adjustments are needed: select HPMC models that are compatible with the pigment system (such as those for inorganic pigments), and control the addition amount within a reasonable range (usually 0.2% -1.0%); Used in combination with dispersants to improve pigment dispersion efficiency; Ensure the purity of HPMC and avoid introducing impurities; Adjust the drying conditions of materials according to the construction environment to ensure the quality of film formation.

双牛纤维素,纤维素醚, HPMC