Ethylene|vinyl Acetate Copolymer CAS 24937-78-8 C18H30O6X2 VAE EVA
Model Number : HMHT0170
|Flash Point||260 °C|
|Vapor Pressure||0.714Mmhg At 25°C|
|Solubility||Toluene, Thf, And Mek: Soluble|
|Storage Conditions||Room Temprature|
Physical and chemical properties
EVA is a random copolymer of ethylene and vinyl acetate. Due to the introduction of short branched chains formed by polar acetic acid groups in the ethylene chain, the original crystalline state is changed, making EVA more flexible and elastic than polyethylene.
The performance of EVA resin has a great relationship with the content of vinyl acetate and melt flow rate. When the MFR is constant, as the content of vinyl acetate increases, its elasticity, flexibility, compatibility and transparency are all improved, and the crystallinity decreases; as the content of vinyl acetate decreases, the performance is close to that of polyethylene. Increased rigidity, improved wear resistance and electrical insulation properties. If the vinyl acetate content is constant, when the MFR increases, the softening point decreases, the processability and surface gloss are improved, but the mechanical strength decreases; on the contrary, as the MFR decreases, the molecular weight increases, and the impact performance and stress cracking resistance Performance has been improved.
EVA is often blended with other polymers as a modifier because of its good flexibility, toughness, stress crack resistance and adhesive properties. The blend of polyethylene and ethylene vinyl acetate copolymer (EVA) has excellent flexibility, processability, good air permeability and printability, so it is widely used.
The blends of polyethylene and EVA show different properties with the changes of many factors such as the blending amount of EVA, the content of VAc in EVA, the molecular weight of EVA, the preparation of the blend, and the processing and molding conditions.
The influence of VAc content in EVA is extremely significant. When the VAc content in EVA is low (6.6%), the amount of EVA added has basically no effect on the crystallinity; the effect of the amount of EVA added on the density is more obvious, that is, the density of the blend increases with the increase of the amount of EVA added, especially After the EVA content reaches 25%, the rise is faster. EVA with a large amount of VAc has a greater modification effect on PE, and both crystallinity and density change sharply. Increasing the VAc content in EVA also leads to a rapid increase in the elongation of PE/EVA blends. The modification effect produced by increasing the ratio of EVA in PE/EVA is generally similar to the effect of increasing the VAc content in EVA.
EVA can modify the impact performance and environmental stress cracking resistance of HDPE. This is due to the fact that the longer branched chains of EVA molecules cannot enter the tightly packed lattice, which strengthens the amorphous region between the lamellar crystals, so the toughness and environmental stress cracking resistance are improved. EVA is also commonly used to improve the compatibility of HDPE with other polymers. For example, after adding EVA to HDPE/LDPE or HDPE/PP blends, the impact toughness of HDPE is increased due to the improved compatibility between the two. . The incorporation of EVA in HDPE can become a flexible material for the manufacture of foam plastics.
25KG PP+PE BAGS or as per customers' requirement
Keep in a cool, dry, dark location in a tightly sealed container or cylinder .
Used as various films, foamed products, hot melt adhesives and polymer modifiers
Wuxi High Mountain Hi-tech Development Co., Ltd is a professional industrial company engaged in special
chemical production, technology research & development, and import & export. The company focuses on
the production, trade, and research & development of various chemical products.
Since establishment, the company has been concentrating on constructing an international marketing
network and optimizing supply chain management, where we have established a long-term strategic
cooperation relationship with numerous large enterprises at home and abroad. Relying on our wide business
channels and professional experience, we are more skillfully providing products of stable but differentiated
quality, along with flexible, highly efficient & considerate service to satisfy our partner at more competitive pricing.
Efficiently treating our customers as partners with sincerity, specialization and satisfaction is our managerial
principle. Attributed to the backup of a dedicated technical team, filled with wide and profound knowledge
and practice in chemicals and world trade for 20 years, the company owns rich experience in product quality
control, technical solution, chemical logistics organization, packaging optimization, port operation, etc., which
accounts for its first-class cost control management and ensures to maintain the overwhelming competitive
advantage over others. In line with the principle of sharing the preferential cost and joint development, the
company has formed an interesting community for years with its customers at home and abroad. Sincerely
to build up a pleasant mutual trust, cooperative, win-win, and value-added sustainable partnership is what
we are achieving to grow together with you!