DECORATIVE COATING FOR INTERIOR WALLS WITH INTEGRATED RECYCLED POLYMERS (PP/HDPE) FOR LOW-COST BUILDINGS

Abstract

This study addressed the high cost and environmental impact of conventional decorative coatings for interior walls. The objective was to develop an affordable, sustainable coating by incorporating recycled polymers (polypropylene (PP) and high-density polyethylene (HDPE)). The researchers adopted a quantitative methodology with a pre-experimental design and developed six prototypes. Three of the prototypes were evaluated through physical and chemical tests in accordance with ISO 10545 and NTP 399.611 standards. The results showed favorable technical performance. The prototypes exhibited low water absorption (between 2.4% and 3.1%), good structural resistance with minimal deformation under bending (between –2.43×1011 and 2.78×108 meters), and thermal stability with an average temperature increase of 5.09°C without cracking. In chemical tests, the prototypes achieved the highest classification (Class 5 and UA) against agents such as iodine, oil, 3% hydrochloric acid, potassium hydroxide, and ammonium chloride. They also achieved a UB classification against more aggressive compounds, such as 18% HCl and 100 g/L KOH. The adhesion test showed 95% effective bonding to the substrate. Overall, the prototypes demonstrated stable structures, durability under domestic use conditions, and uniform performance. These results validate the proposal as a viable alternative that is technically sound, ecologically responsible, and functionally effective. It also contributes to reducing plastic waste and promoting the sustainable use of recycled materials in the construction sector.