The Difference Between Redispersible Latex Powder and Resin Adhesive Powder
Currently, the most widely used redispersible latex powders globally include: vinyl acetate-ethylene copolymers (VAC/E), ethylene-vinyl chloride-vinyl laurate terpolymers (E/VC/VL), and vinyl acetate-ethylene-vinyl ester of fatty acid terpolymers (VAC/E/VeoVa). These three types of redispersible latex powders dominate the overall market—particularly the vinyl acetate-ethylene copolymer (VAC/E), which holds a leading position globally and serves as the benchmark for the technical characteristics of redispersible latex powders. From the perspective of technical expertise regarding polymers used for mortar modification, it remains the optimal technical solution.
Redispersible Latex Powder
1. Redispersible latex powder is a water-soluble, redispersible powder product; it is a copolymer of ethylene and vinyl acetate, utilizing polyvinyl alcohol as a protective colloid.
2. VAE redispersible latex powder possesses film-forming properties; a 50% aqueous solution forms an emulsion, which, after being left on a glass surface for 24 hours, dries to form a plastic-like film.
3. The resulting film exhibits a certain degree of flexibility and water resistance, meeting relevant national standards.
4. Redispersible latex powder delivers high performance: it features high bonding capacity, unique properties, and outstanding water-repellent capabilities. It provides excellent bond strength and imparts superior alkali resistance to mortar. In addition to improving the mortar’s adhesion, flexural strength, plasticity, abrasion resistance, and workability, it offers particularly strong flexibility when used in crack-resistant mortars.
Resin Adhesive Powder
1. Resin adhesive powder is a novel product that serves as a modifier for various substances, including rubber, resins, high-molecular polymers, and finely ground adhesive powders.
2. Resin adhesive powder exhibits only average durability and abrasion resistance, and its dispersibility is poor. Some varieties have a flocculent texture (likely due to the inclusion of porous materials such as sepiolite), while others appear as a white powder (though they often emit a pungent odor reminiscent of kerosene).
3. Certain types of resin adhesive powder possess a degree of corrosiveness toward the substrate boards, and their waterproofing performance is less than ideal.
4. Both the weather resistance and water resistance of resin adhesive powder are inferior to those of redispersible polymer powder. Its weather resistance, in particular, constitutes a significant issue; when exposed to sunlight, it volatilizes within a relatively short period. Even in the absence of direct sunlight, the adhesive interface—particularly in cavity-based construction applications—tends to degrade at a comparatively rapid pace.
5. Resin adhesive powder lacks formability and, furthermore, possesses no inherent flexibility. According to the testing standards for exterior wall thermal insulation mortars, it meets the required criteria solely regarding the failure rate of polystyrene boards; all other performance indicators fail to meet the established standards.
6. Resin adhesive powder is suitable exclusively for bonding polystyrene boards; it cannot be utilized for bonding vitrified microspheres or fireproof boards.
