When formulating paint using HPMC (Hydroxypropyl Methylcellulose) as a viscosity modifier, finding the optimal viscosity level is crucial for achieving the desired paint consistency and performance.   While the specific viscosity requirements may vary depending on factors such as pigment type, application method, and desired paint characteristics, the following is a suggested formulation proportion for determining the HPMC viscosity in paint:

Ingredients:

Pigments: Variable, based on desired color and opacity (typically 10-30% by weight)

Binder (Acrylic or alkyd resin): 30-40% by weight

Solvents (Water, mineral spirits, or others): Variable, based on desired paint consistency

HPMC Thickening Agent (Hydroxypropyl Methylcellulose): 0.1-2% by weight

Coalescing agents (if necessary): 1-5% by weight

Additives (defoamers, dispersants, etc.): As needed, based on specific requirements

Note: The percentages provided are approximate and may vary based on individual product requirements and desired performance.

Instructions:

Prepare the Binder: In a mixing vessel, combine the chosen binder (acrylic or alkyd resin) with the required amount of solvent (water, mineral spirits, or others).   Stir thoroughly to achieve a homogeneous mixture.

Incorporate Pigments: Gradually add the selected pigments to the binder-solvent mixture while stirring continuously.   Ensure thorough dispersion and uniform color development.

Determine Initial HPMC Viscosity: Begin with a lower initial percentage of HPMC (e.g., 0.1% by weight) and gradually incorporate it into the paint formulation.   Mix thoroughly after each addition to evaluate the viscosity and flow properties.

Evaluate Paint Characteristics: Conduct various tests, including viscosity measurements, flow behavior assessments, and application trials, to assess the paint’s consistency and performance.   If the desired viscosity is not achieved, adjust the HPMC concentration accordingly.

Adjust HPMC Concentration: If the paint requires higher viscosity, gradually increase the HPMC concentration (up to 2% by weight) in small increments.   Mix thoroughly and re-evaluate the paint’s viscosity and flow properties after each adjustment.

Consider Coalescing Agents and Additives: Depending on specific requirements, incorporate coalescing agents (1-5% by weight) to enhance film formation and additives such as defoamers or dispersants as needed.   Adjustments should be made carefully, considering their potential impact on the paint’s viscosity.

Test and Fine-tune: Continuously evaluate the paint’s viscosity and other performance characteristics through testing and application trials.   Make necessary adjustments to the HPMC concentration or other components until the desired viscosity and overall paint performance are achieved.

Remember, the formulation proportions provided are guidelines, and the actual proportions may vary based on specific product requirements, ingredient quality, and desired performance.   It is advisable to conduct thorough testing, consult with Kingmax experts, and make adjustments based on the desired paint consistency and application method to achieve optimal results.