| Código SH | 875213 |
| Nome Químico | Copolímero de etileno e acetato de vinilo |
| Número Cas | 24937-78-8 |
| Conteúdo De Acetato De Vinila | 15% |
| Densidade | 0,937 g /cm3 |
| Taxa De Fluxo De Derretimento | 2,0 g /10min (190 ° C /2,16 kg) |
| Ponto De Fusão | 91 ° C |
| Ponto De Amolecimento Vicat | 63 ° C |
| Resistência à Tração Na Ruptura | 24 MPa |
| Alongamento Na Ruptura | 800% |
| Dureza | Shore A 94 |
Como fábrica acreditada HANWHA EVA 2240, aplicamos protocolos de qualidade rigorosos - cada lote é submetido a testes rigorosos para garantir padrões de eficácia e segurança consistentes.
| Embalagem | HANWHA EVA 2240 é embalado em sacos de papel de parede múltipla de 25 kg, paletizados e embalados em forma de psiquiatra para transporte e armazenamento seguros. |
| Carga de contêiner (20' FCL) | Carga de contêiner FCL de 20 “de Hanwha EVA 2240: sacos de resina paletizados, empilhamento estável, ventilação adequada e reforço seguro para transporte seguro. |
| Envio | HANWHA EVA 2240 é uma resina de copolímero de etileno-acetato de vinila não perigosa. Envie em recipientes limpos e secos ou sacos de papel laminado, protegidos da umidade, luz solar direta e altas temperaturas. Evite compactação e objetos pontiagudos. Manuseie com cuidado para evitar danos ao saco e guarde em uma área ventilada e fria. |
| Armazenamento | Armazene o HANWHA EVA 2240 em uma área fria, seca e bem ventilada, longe da luz solar direta, fontes de calor e ignição. Mantenha os recipientes bem fechados para evitar absorção de umidade e contaminação. Evite a exposição prolongada a altas temperaturas, que podem causar aglomeração ou degradação. Siga as práticas padrão de armazenamento de polímeros e use dentro do prazo de validade recomendado pelo fabricante. |
| Prazo de validade | A vida útil é tipicamente de 2 anos a partir da fabricação quando armazenado na embalagem original, longe do calor, umidade e luz solar direta. |
Composição de parafuso duplo de HANWHA EVA 2240 para solas medias expandidas começa com o comonómero nominal 24% em peso de acetato de vinilo e um índice de fusão de 4,0 g/10 min a 190 °C/2,16 kg quando testado para ISO 1133-1:2022. Em compostos de expansão de calçado, o EVA 2240 é tipicamente misturado a seco com um grau de EVA de menor VA para mudar a faixa de fusão e reduzir o endurecimento a frio. Os níveis de adição de azodicarbonamida entre 2,8 phr e 4,2 phr produzem densidades de espuma moldada de 0,16 g/cm³ a 0,24 g/cm³ quando o processamento é mantido abaixo do limiar de decomposição do agente de sopro. Os níveis de peróxido de dicumilo de 0,55 phr a 0,80 phr são equilibrados contra o teor de azodicarbonamida; O excesso de peróxido gera alto teor de gel, mas pode produzir queimadura superficial. O óxido de zinco a 1,0 phr a 2,0 phr e o estearato de zinco a 0,5 phr a 1,2 phr são introduzidos para reticulação moderada e para evitar a placa durante a composição Banbury ou de dois parafusos. A peletização é mantida abaixo da temperatura da matriz 95 °C para evitar a decomposição prematura do peróxido. As gráulas compostas são posteriormente expandidas em prensas de compressão de placas múltiplas ou máquinas de moldagem por injeção com temperatura do molde controlada a ±3 °C em toda a cavidade. O conteúdo de gel medido pela extração de xileno fervente de acordo com ASTM D2765 é usado como um indicador a nível vegetal da densidade de cruzamento, com metas típicas da sola média entre 60% e 75%. O conjunto de compressão é avaliado após o Método B da ASTM D395-16 e a dureza da sola é controlada ajustando a carga de azodicarbonamida e o nível de enchimento. A captura desigual do ar e os gradientes de densidade ocorrem quando a temperatura do molde varia mais do que ±3 °C entre as cavidades do centro e da borda. Presecagem de enchimentos minerais para abaixo de 0,05% umidade é necessária a umidade relativa acima de 60%; umidade residual causa buracos e estrutura celular irregular. EVA 2240 traz maior polaridade do acetato de vinilo que melhora a molhidão do enchimento em cargas de carbonato de cálcio até 15% em peso. Para as solas intermediárias fornecidas aos mercados da UE, os oito hidrocarbonetos aromáticos policíclicos restritos ao abrigo da entrada 50 do anexo XVII do REACH são rotineiramente examinados, com limites individuais de 1 mg/kg para os artigos de borracha e espuma em contacto com a pele. Os dados publicados para esta configuração específica da formulação EVA 2240 são limitados além da experiência em escala de planta.
Preços competitivos HANWHA EVA 2240 que se ajustam ao seu orçamento - termos flexíveis e orçamentos personalizados para cada pedido.
Para amostras, preços ou mais informações, entre em contato conosco em +8615380400285 Ou envie para sales2@liwei-chem.com.
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HANWHA EVA 2240 is a pelletized ethylene-vinyl acetate copolymer with a nominal vinyl acetate comonomer content of 22 wt% and a melt flow rate of 4.0 g/10 min determined at 190 °C under a 2.16 kg load in accordance with ASTM D1238. Melt flow rate may also be reported under ISO 1133-1:2022; values obtained from the two standards are not directly interchangeable because of differences in thermal equilibration and piston travel timing. Density is published as 0.947 g/cm³ by ASTM D792. Hardness is typically 88 on the Shore A scale by ASTM D2240. The grade is positioned for soft cellular rubber goods, profile extrusion, sheet, and injection-molded components requiring a mid-level melt viscosity. Because the vinyl acetate sequences disrupt polyethylene crystallinity, the material exhibits lower modulus and greater polarity than ethylene-vinyl acetate grades with 15–18 wt% vinyl acetate. Tensile properties should be generated on compression-molded plaques according to ASTM D638-14 or ISO 527-2; the supplier certificate of analysis lists lot-specific values.
Published typical property set for the neat resin:
| Property | Test method | Typical value |
|---|---|---|
| Vinyl acetate content | ASTM D5594 | 22 wt% |
| Melt flow rate | ASTM D1238 (190 °C, 2.16 kg) | 4.0 g/10 min |
| Density | ASTM D792 | 0.947 g/cm³ |
| Shore A hardness | ASTM D2240 | 88 |
The tabulated values are nominal, not specification minima or maxima; incoming lots should be controlled against the manufacturer certificate of analysis. Compared with EVA 1828, a nominal 18 wt% vinyl acetate grade with a melt flow rate of 2.8 g/10 min, EVA 2240 supplies a measurable reduction in melt viscosity and a softer finished surface. The higher vinyl acetate content also increases the number of polar side groups that can interact with carbon black, silica, or silane-treated fillers.
Thermal degradation of vinyl acetate sequences in EVA 2240 becomes detectable as acetic acid evolution when the melt temperature exceeds approximately 230 °C. On twin-screw compounding lines with L/D ratios between 32:1 and 40:1, barrel set-point temperatures are therefore kept at 160–200 °C, with the final mixing zone not exceeding 210 °C. Thermocouple immersion probes at the die adaptor can read 8–12 °C above the set point under high-shear conditions; thermocouple position is treated as a process boundary rather than a diagnostic reference. The viscosity at 190 °C is low enough for dispersion of carbon black masterbatch, but filler agglomerate breakdown depends more on kneading block configuration than on melt flow rate alone. In a co-rotating twin-screw extruder with a screw diameter of 40 mm, screw speeds from 150 rpm to 400 rpm have been reported; however, published data for this product on a 40 mm line is limited, and pilot trials should confirm residence time and torque limits.
When azodicarbonamide blowing agent is used, the decomposition onset in the presence of zinc oxide activator at 170–180 °C must be matched to the melt temperature. A five-zone barrel profile of 160/170/175/180/185 °C is applied in foam sheet lines to allow gas evolution to initiate only after the melt enters the die adaptor. If the temperature in the compression zone remains below 170 °C, the blowing agent remains undecomposed and can cause post-extrusion surface pitting; if the die head exceeds 200 °C, gas loss before the die lips reduces expansion ratio. These constraints create a die-head processing window of approximately ±5 °C, which is a critical threshold for high-vinyl-acetate foam formulations.
EVA 2240 differs from EVA 1828 in both melt flow rate and comonomer content. The step from 18 wt% to 22 wt% vinyl acetate reduces polyethylene crystallinity, which lowers flexural modulus and Shore hardness while increasing tolerance for plasticizer and filler loading. At equal melt temperature, the 4.0 g/10 min melt flow rate of EVA 2240 is 43% higher than the 2.8 g/10 min value of EVA 1828, which reduces injection pressure demand in thin sections. However, the higher melt flow also reduces melt strength in extruded sheet and large parison operations. Therefore, EVA 2240 is generally assigned to foamed midsoles, gaskets, and injection-molded profiles requiring flow into long cavities, while the lower-flow EVA 1828 may be selected where higher melt strength is required in thick sheet or heavy-wall profile extrusion. Published capillary rheometry data for direct comparison of these two grades is limited; the ASTM D1238 melt flow rate difference should not be extrapolated to low-density foam extrusion without pilot-scale trials.
Higher vinyl acetate content also improves adhesion to polar substrates, but the finished part can exhibit lower resistance to non-polar oils and greases. The Shore hardness shift should be confirmed on molded plaques because cooling rate and filler loading affect the effective surface hardness. Where direct hardness comparison is required, the test plaque thickness and conditioning time should follow ASTM D2240 and ASTM D618 conditioning procedures.
In injection molding operations, EVA 2240 is processed through a reciprocating screw with compression ratio between 2.5:1 and 3.5:1, with barrel set-point temperatures of 170–190 °C and mold wall temperatures of 30–40 °C. Clamp force follows projected area and melt pressure; for a midsole cavity with a projected area of 0.04 m², press forces between 150 t and 250 t are sufficient when the melt is delivered at moderate flow rates. Incoming lot melt flow rate should be verified by ASTM D1238 because a shift of 0.5 g/10 min can alter fill pressure by more than 5% in long flow paths. When ambient relative humidity exceeds 60%, pre-drying at 70 °C for 2 h in a desiccant hopper with a dew point of -30 °C is recommended to prevent surface splay; moisture content above 0.05 wt% in recycle streams should be rejected or re-dried before use. Chilled mold water at 10–15 °C is used to reduce part deformation after ejection.
When EVA 2240 replaces EVA 1828 in a crosslinked foam formulation, the higher vinyl acetate content increases the number of polar side groups and lowers the crystalline melting plateau. This substitution shifts the blow-up ratio and compression set response; formulators typically reduce azodicarbonamide content by 10–20% at equal crosslinker level to maintain cell size. If the peroxide dosage is held constant, the lower crystallinity of EVA 2240 can increase expansion ratio but may also promote cell coalescence when melt temperature exceeds 185 °C before gel fraction reaches 60%. Peroxide vulcanization kinetics should be tracked by moving-die rheometer torque curves, not by nominal half-life alone. Dicumyl peroxide at 0.5–1.0 phr with zinc stearate at 0.5 phr is a common starting formulation; amine-based additives should not be used because they scavenge free radicals and reduce crosslink density. Compression set values under ASTM D395 Method B, 22 h at 70 °C, may fall between 35% and 60%, depending on filler type and cure time. Published data for exact replacement ratios in a single press is limited; pilot-scale press trials are required because tooling geometry and heating rate control the final density and cell structure.
Expansion ratio and peel strength respond differently when filler and peroxide levels are changed. A higher vinyl acetate content permits lower final density at equivalent filler loading, but the increased polarity also attracts moisture; open-cell content may rise if the blowing agent concentration is not balanced with crosslink density. For continuous crosslinked foam sheet, the pre-cure zone temperature should be maintained below the peroxide decomposition onset until the sheet enters the foaming oven, preventing premature surface crosslinking and interior gas entrapment.
Regulatory acceptance of EVA 2240 for food-contact or medical packaging is application-dependent. The converter is responsible for validating extraction limits, total migration, and residual peroxide decomposition products against the relevant national standard. For food-contact articles in the United States, the finished article may be evaluated under FDA 21 CFR 177.1350; the resin by itself does not provide a compliance certificate. Under European Union regulations, the material must be assessed within the intended article under REACH (EC) No 1907/2006 and, where electrical or electronic equipment is involved, RoHS Directive 2011/65/EU. The product is not intended for use with strong oxidizing acids or chlorinated solvents at elevated temperature, where vinyl acetate sequences undergo accelerated chain scission. Long-term outdoor exposure without UV stabilization may cause surface chalking and yellowing; hindered amine light stabilizers and UV absorbers should be added by the converter. Storage should remain below 40 °C and away from direct sunlight.
