Update:The third major application field of RF-8602 marked in the official TDS is flexible napped relief middle coatings, a dec...
The third major application field of RF-8602 marked in the official TDS is flexible napped relief middle coatings, a decorative architectural coating used for interior wall texture relief, artistic napped wall surfaces and decorative base layers. Most acrylic emulsions used for relief coatings on the market have insufficient flexibility; after film formation, the texture layer is brittle and easy to crack when the wall substrate shrinks, and the adhesion with the top finishing coat is poor, leading to peeling and mottling of the decorative surface. RF-8602’s low Tg flexible copolymer structure and adjustable viscosity range provide a new raw material solution for relief coating manufacturers. This article elaborates on the application value, formula design and construction texture advantages of RF-8602 in napped relief middle coatings.
Relief middle coatings need to simultaneously meet four core performance indicators:
- Good texture molding ability: The slurry has moderate thixotropy, can form uniform napped concave-convex texture without sagging on vertical walls;
- High flexibility: The film does not crack with tiny wall substrate deformation, avoiding texture cracking and wall surface repair;
- Excellent interlayer adhesion: Firm bonding with the base wall surface and the top decorative finish coat, no delamination;
- Stable storage: No microbial mildew, no latex demulsification and precipitation after long-term storage of finished coating.
Ordinary hard acrylic emulsions have Tg above 5°C, the formed relief film is rigid, and micro-cracks will appear on the texture surface after seasonal temperature changes; high-flex polyurethane emulsions have high cost and poor compatibility with inorganic filler sand powder, which limits large-scale promotion. RF-8602 balances cost and flexibility, with Tg=-10°C, and the viscosity range of 100–5000 mPa.s can be adjusted according to the texture construction process, which is very suitable for relief middle coating production.
The main raw materials of flexible napped relief middle coating include RF-8602 emulsion, inorganic matte filler, quartz sand of different mesh sizes, cellulose thickener, biocide, defoamer and water. RF-8602 acts as the film-forming flexible binder of the whole system, and the proportion of emulsion in the formula is controlled at 18–25 wt% according to the texture thickness requirement: thick napped relief with high concave-convex texture increases the emulsion proportion to improve film flexibility; thin matte texture can appropriately reduce the emulsion proportion to control production cost.
The factory can customize the viscosity of RF-8602 raw emulsion: manual scraping and rolling construction of small-batch decorative coatings select medium viscosity specifications (2000–4000 mPa.s), which saves the amount of thickener added in the formula; large factory automatic pipeline spraying production selects low-viscosity RF-8602 (100–1000 mPa.s), which is convenient for pipeline conveying and high-speed dispersion mixing with fillers. The blue light milky white appearance of RF-8602 represents uniform latex particle size distribution, and the mixed relief coating slurry has fine texture without coarse particles, and the formed napped surface is delicate and uniform.
After the relief coating mixed with RF-8602 is scraped on the wall, water evaporates and latex particles coalesce to form a continuous elastic polymer network, wrapping inorganic sand and filler particles inside the film. When the concrete wall shrinks or expands with temperature, the polymer network can stretch and deform synchronously, absorbing internal stress, so that the concave-convex relief texture will not produce obvious cracks. Compared with hard acrylic relief coatings, the crack resistance service life of RF-8602 modified middle coatings is increased by more than 3 times, greatly reducing the after-sales repair rate of decorative wall engineering.
In addition, the anionic molecular structure of RF-8602 improves the surface activity of the relief film, enhances the adhesion between the middle coating and the subsequent water-based finish coat, and avoids the common problems of mottling, peeling and color difference of the top coat caused by poor interlayer bonding of traditional relief coatings.
RF-8602 original sealed packaging has built-in microbial inhibitors, and will not mildew or corrupt during transportation and 6-month sealed storage. After being prepared into finished relief coating, a small amount of compatible broad-spectrum biocide needs to be added to the formula, because the mixed coating contains a large amount of inorganic filler and free water, which is easy to breed bacteria and mold after long-term opening and use. The TDS specially reminds that hygiene management should be strengthened during processing and after opening packaging to prevent microbial attack; regular addition of biocide is the standard process for relief coating manufacturers to extend the shelf life of finished products.
Napped relief coatings are almost all used for indoor wall decoration, and indoor environmental protection indicators are the primary consideration of decoration owners and engineering contractors. RF-8602 does not contain plasticizer, APEO and free ammonia; no irritating odor is released during construction and film formation, and will not release harmful volatile substances after long-term indoor use, meeting the national indoor wall coating environmental testing standards, and can be safely used for children’s rooms, hotel guest rooms and office interior decorative relief projects.
RF-8602 breaks the dilemma of hard texture and easy cracking of traditional relief middle coatings with its ultra-low -10°C glass transition temperature and adjustable viscosity performance. It can develop flexible napped relief coatings with different texture thicknesses through simple formula proportion adjustment, and has dual advantages of stable production processing and environmentally friendly indoor use, becoming a cost-effective core film-forming raw material for decorative architectural coating manufacturers.
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