VAE S-465HQ

Adhesives are essential for almost every item we use in our daily lives, from furniture and flooring to packaging. Traditional adhesives, such as solvent-based glues and bone glue, have long dominated the market. However, with growing environmental awareness and technological advancements, a new adhesive, VAE Emulsion (Vinyl Acetate–ethylene Copolymer Emulsion), is gradually entering our market.     I. Introduction to VAE Emulsions Vinyl acetate and ethylene copolymer emulsions typically contain 0-30% vinyl groups. Ethylene acts as an internal plasticizer. A higher vinyl content results in a lower glass transition temperature, a softer resin, and greater flexibility. Ethylene also has low polarity and excellent water resistance. Previously, only polyvinyl acetate emulsions were available, but these had poor water resistance and flexibility, and also exhibited poor adhesion to non-polar or less polar materials such as polyethylene and polyvinyl chloride. VAE emulsions are used in wood glue, paper packaging adhesives, architectural coatings, mortar modification (e.g., waterproofing), and even plastic film lamination.   2. Advantages of VAE Emulsions in Architectural Coatings Low VOC Low-VOC latex paints using VAE emulsions (such as VAE Emulsion CW 40-600) provide a high-quality interior environment with excellent workability and good color development. In Europe, over 90% of zero-/low-VOC interior wall paints use VAE emulsions. VAE emulsions are the primary binder used in cigarette adhesives. Compared to acrylic emulsions, vinyl acetate emulsions contain fewer benzenes and aromatic hydrocarbons. Furthermore, they do not require the addition of coalescing agents. Acrylic emulsions, on the other hand, lack the ability to achieve both film-forming and scrub resistance, necessitating the addition of coalescing agents to ensure a high Tg. Vinyl acetate, on the other hand, is softened by water, eliminating the need for coalescing agents.   Weatherability The presence of vinyl monomers in VAE emulsions increases the polymer's hydrophobicity, resulting in excellent water resistance in the resulting coating. This is crucial for outdoor coatings, as it prevents rain from eroding the coating, leading to blistering, cracking, and flaking. Chalking Resistance: Chalking is the phenomenon of paint decomposing due to aging under the influence of ultraviolet light and oxygen, resulting in the formation of white powder on the surface. VAE emulsions have excellent chalking resistance, which helps the coating maintain its appearance and protective properties over time. Flexibility and Crack Resistance: VAE emulsion coatings exhibit excellent flexibility, adapting to the expansion and contraction of the substrate due to temperature fluctuations. This effectively prevents cracking caused by stress concentration in the coating, thereby extending the coating's service life. Adhesion: VAE emulsions (such as VAE Emulsion CW 40-602) exhibit excellent adhesion to a variety of substrates, including common building materials such as cement and bricks. Even in adverse weather conditions, the coating remains firmly attached to the wall and resists peeling.   Cost Advantages First, there is no need to purchase expensive solvents, reducing raw material costs. Second, its high solids content means that less material is required for the same bonding effect. More importantly, it reduces environmental remediation costs associated with hazardous emissions and potential safety risks. For businesses, choosing VAE emulsions is not only a positive response to environmental regulations but also a long-term, sustainable economic investment.   Strong Adhesion Used in Mortar Mixing: VAE emulsion, when added to mortar, increases strength, improves adhesion to various substrates, enhances wear and impact resistance, improves water absorption and permeability, and improves chemical resistance. This polymer mortar is currently widely used due to its excellent properties. Characteristics of Mortar Mixed with VAE Emulsion: When VAE is added to mortar, many properties are improved, as shown in Figure 1. However, the performance of the mortar varies depending on the amount of emulsion added. According to Sumitomo Corporation's research, a P/C (polymer weight/cement weight) ratio of 0.1-0.4 is the optimal ratio for both performance and economics. Increasing Mortar Strength: The fluidity (flow value) of mortar increases with the amount of emulsion added. This fact demonstrates that by adding emulsion, the amount of water can be reduced, resulting in a denser hardened material, increased strength, and reduced shrinkage and water absorption. Improving Mortar Brittleness: When VAE emulsion is mixed into the mortar, vibration-absorbing polymer particles fill the voids in the cement, improving the mortar's impact resistance.   3. Future Development Trends of VAE Emulsions Non-PVA Emulsifier Systems Using a surfactant system and soap-free polymerization technology eliminates the drawbacks of poor water resistance and large particle size caused by PVA's water resistance. Copolymer Systems Using versatate vinyl carbonate, it leverages its high weathering, water, and alkali resistance.   With the growing global focus on sustainable development and green manufacturing, the environmental and health issues associated with traditional adhesives are facing increasing challenges. As a high-performance, environmentally friendly, and versatile adhesive, VAE emulsions are experiencing rapidly growing market demand. Their applications are not only expanding in traditional wood processing, paper products, and textiles, but are also showing great potential in emerging areas such as automotive interiors, building materials, and battery bonding.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com  

Vinyl acetate is a colorless flammable liquid with a strong odor. Its vapor is irritating to the eyes. It is insoluble in water but soluble in most organic solvents. Vinyl acetate monomer(VAM) is flammable and reacts rapidly with chlorine, bromine, and ozone. There are two production process routes for vinyl acetate monomer: the ethylene method and the acetylene method. The acetylene method can be divided into a liquid phase method and a gas phase method, and the ethylene method can also be divided into a liquid phase method and a gas phase method.   Acetylene gas phase method: desulfurized and dephosphinated calcium carbide acetylene and acetic acid are used as raw materials, the catalyst is zinc acetate-activated carbon (15:100), and a promoter is added. The reaction temperature is 170~200℃, the pressure is atmospheric pressure, and the space velocity is 200~400/h. Reaction results: acetic acid single-pass conversion rate is 25~40%, acetylene single-pass conversion rate is 12~16%. The selectivity of VAM is 92~96% for acetylene and 95~98% for acetic acid. The total yield of VAM is 97~98% for acetic acid and 92~96% for acetylene.   The catalysts for the ethylene gas phase process are mainly Pd-Au, Pd-Pt and Pd-Cd supported catalysts, and the carriers are mainly silica gel and alumina. The two main factors affecting the catalyst are the coordination ability of Pd and the ability of acetic acid or acetate to oxidize Pd(0) to Pd(II). The single-pass conversion rate of ethylene in this process is 8~10%, the single-pass conversion rate of acetic acid is 8~20%, and the VAM ( CW 40-600 & ECO VAE 1608) selectivity based on ethylene is 90~94%.   In the past few years, the acetylene process has been gradually replaced by the ethylene process due to the high cost of raw materials. However, with the continuous rise in oil prices, the acetylene process has regained economic vitality, especially the acetylene process using natural gas as raw material. At present, the acetylene process still occupies an important position in China. The ethylene gas phase process occupies a dominant position in the market due to its good processability and economic performance. At present, the ethylene production technology in China accounts for more than 55% of the total national production capacity.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com ElephChem Holding Limited, professional market expert in Polyvinyl Alcohol(PVA) and Vinyl Acetate–ethylene Copolymer Emulsion(VAE) with strong recognition and excellent plant facilities of international standards.