| Código SH | 824515 |
| Nome Do Produto | ELVAX 460 Copolímero de Etileno Vinil Acetato |
| Nome Químico | Copolímero de etileno-acetato de vinilo |
| Número Cas | 24937-78-8 |
| Conteúdo De Acetato De Vinila | 18% em peso |
| Taxa De Fluxo De Derretimento | 2,1 g /10 min (190 ° C /2,16 kg) |
| Densidade | 0,941 g /cm³ |
| Ponto De Fusão | 88 ° C (pico DSC) |
| Ponto De Amolecimento Vicat | 57 ° C (ASTM D1525, 50 ° C /h) |
| Resistência à Tração Na Ruptura | 21 MPa (ASTM D638) |
| Alongamento Na Ruptura | 800% (ASTM D638) |
| Módulo Flexural | 41 MPa (ASTM D790) |
| Dureza | 40 Shore D |
| Temperatura De Fragilidade | -76 ° C (ASTM D746) |
Como fábrica acreditada ELVAX 460 Copolímero de Etileno Vinil Acetato, aplicamos protocolos de qualidade rigorosos - cada lote é submetido a testes rigorosos para garantir padrões de eficácia e segurança consistentes.
| Embalagem | O copolímero de etileno acetato de vinila ELVAX 460 é fornecido como pellets translúcidos em sacos de papel multiparede de 25 kg, paletizados e embalados em retrátil. |
| Carga de contêiner (20' FCL) | Copolímero ELVAX 460 carregado em FCL 20 ", paletizado, protegido e protegido contra umidade /contaminação para transporte seguro. |
| Envio | O copolímero de acetato de etileno e vinil ELVAX 460 é fornecido como pellets sólidos em sacos de papel de várias paredes ou sacos de polipropileno tecido. Mantenha os paletes secos, longe do calor e da luz solar direta. O produto não é perigoso para o transporte, mas a higiene industrial padrão e as precauções de manuseio seguro devem ser observadas. |
| Armazenamento | Armazene ELVAX 460 em uma área fria, seca e bem ventilada, longe da luz solar direta, fontes de calor e chamas abertas. Mantenha os recipientes bem fechados para evitar contaminação e coleta de umidade. Evite o armazenamento prolongado acima de 30 ° C (86 ° F), pois temperaturas elevadas podem causar a fusão ou bloqueio de pelotas. Mantenha longe de agentes oxidantes fortes. |
| Prazo de validade | ELVAX 460 tem um prazo de validade de aproximadamente dois anos quando armazenado em embalagem original fechada em condições frias e secas, longe da luz solar. |
Linhas de vedação de caixas e caixas que funcionam acima de 1.000 recipientes por minuto impõem uma faixa estreita de viscosidade em adesivos de fusão a quente porque o aplicador de ranura-matriz deve fornecer um padrão contínuo sem cola ou cordeamento em cintas de compressão de alta velocidade. ELVAX 460, com um teor nominal de acetato de vinilo de 18% em peso e um índice de fusão de 2,5 g/10 min como determinado por ASTM D1238 a 190°C/2,16 kg, fornece a resistência coesiva e a extensibilidade de cera de parafina necessária para ligações de rasgamento de fibras onduladas. Formulações típicas contêm 30-38% em peso ELVAX 460, 35-45% em peso hidrocarboneto pegajoso, 15-25% em peso mistura de cera, e 0,5-1,0% em peso antioxidante fenólico impedido. A viscosidade de Brookfield a 150°C medida de acordo com ASTM D3236 mantém 800–1.600 mPa·s. A temperatura de aplicação 175°C a mesma formulação cai para 350-800 mPa·s. Os descarregadores de tambor Meltex ou Nordson equipados com bombas 8:1 entregam a fusão para cabeças de slot-die a 165–175°C. Standby a 120-130°C limita a degradação térmica. A acumulação de char nas paredes laterais do tanque ocorre após a residência de 24 h acima de 180°C, causando deriva de viscosidade e oclusão intermitente do bico. Um cobertor de nitrogênio no tanque de fusão reduz a oxidação superficial, mas não elimina a clivagem térmica dos grupos laterais de acetato de vinilo. O ácido acético evoluído pode corroder os boços de latão se não forem evacuados. Amostras de cartão ondulado ligado condicionado para 24 h a 23 ° C e 50% RH produzir 100% fibra rasgar sob ASTM D903. A -18°C a mesma articulação pode falhar coesivamente na fase de cera se a fração de cera exceder 25% em peso. Para selagem de caixas de contato indireto com alimentos, o adesivo formulado cai sob FDA 21 CFR 175.105 desde que o alimento seja separado por uma barreira funcional e a camada adesiva atenda às restrições extrativas aplicáveis. O registro REACH ou o pré-registro do pegajoso e do antioxidante é necessário para os volumes de importação da UE. A triagem de metais pesados RoHS por IEC 62321-3-1 é aplicável à exportação para embalagens eletrônicas da UE.
Preços competitivos ELVAX 460 Copolímero de Etileno Vinil Acetato 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.
Responderemos a você o mais rápido possível.
Telefone: +8615380400285
E-mail: sales2@liwei-chem.com
Pagamento flexível, preço competitivo, serviço premium - Consulte-nos agora!
ELVAX 460 is an ethylene vinyl acetate copolymer resin in which the vinyl acetate comonomer content is 18% by weight and the melt index is 2.5 g/10 min when determined at 190 °C under 2.16 kg load according to ASTM D1238. The resin is supplied as solid pellets and is used in hot-melt adhesives, sealants, wax modifiers, and polymer compounding. Density under ASTM D792 is reported at 0.941 g/cm³ at 23 °C. The grade is a member of the Elvax 400-series and is differentiated from adjacent 18% VA grades principally by melt index. In the Elvax 400-series, 18% vinyl acetate is the intermediate-polarity level; grades with the same comonomer content but different melt index provide a formulator with viscosity and cohesive strength options without changing polymer polarity. The combination of 18% vinyl acetate and 2.5 g/10 min melt index places ELVAX 460 in the medium molecular weight segment of the series. This position makes the resin specified for slot-die hot-melt coating, profile extrusion, and adhesive compounding where both pumpability and final bond strength are controlled.
Routine certificate-of-analysis parameters for ELVAX 460 include vinyl acetate content, melt index, density, and moisture content. Vinyl acetate content is determined by saponification titration or infrared spectroscopy. Melt index is measured under ASTM D1238 or ISO 1133-1:2022 procedure A at 190 °C with 2.16 kg load. Density values are obtained by ASTM D792 or ISO 1183-1:2019. The polymer is not a single molecular weight entity; polydispersity and long-chain branching are controlled by the polymerization process and influence shear thinning. For incoming inspection, melt index and density are sufficient for lot identity screening. Vinyl acetate content should be confirmed when the resin is used in food-contact or high-clarity applications. Moisture content is typically below 0.1% for properly stored pellets. Pre-drying is normally not required below 60% relative humidity, but surface moisture after humid exposure can produce bubbles and die-face buildup during hot-melt coating.
| Parameter | Method | Typical value |
|---|---|---|
| Vinyl acetate content | Manufacturer titration /infrared method | 18.0% |
| Melt index, 190 °C/2.16 kg | ASTM D1238 /ISO 1133-1:2022 | 2.5 g/10 min |
| Density, 23 °C | ASTM D792 /ISO 1183-1:2019 | 0.941 g/cm³ |
| Physical form | Visual inspection | Pellets |
Differential scanning calorimetry under ASTM D3418 or ISO 3146 produces a broad primary melting endotherm for 18% vinyl acetate EVA. Published curves for this comonomer range typically show the main endotherm between 70 °C and 90 °C, with exact peak temperature dependent on cooling rate and thermal history. The recrystallization exotherm on cooling is more relevant to hot-melt set speed than the melting endotherm. Set speed increases when crystallization begins earlier on the cooling curve. The 18% vinyl acetate level reduces the crystallinity of polyethylene homopolymer but leaves sufficient crystallinity for rapid solidification after coating. In hot-melt formulation work, open time is adjusted more by wax selection and loading than by the polymer grade alone. The polymer contributes melt viscosity and solid-state cohesive strength, while wax and tackifier control substrate wetting and setting. Capillary rheometry at 200 °C shows strongly shear-thinning behavior. Specific viscosity curves for ELVAX 460 are not fully published by the resin supplier, so formulators perform frequency sweeps using parallel-plate rheometry before selecting gear pump clearances and slot-die geometries.
In hot-melt adhesive systems formulated with rosin ester tackifiers, hydrocarbon resins, paraffin waxes, or microcrystalline waxes, ELVAX 460 provides the elastic and cohesive network after cooling. Open time is controlled by the temperature window between melt application and crystallization onset. With 18% vinyl acetate, the polymer is semicrystalline; open times are generally shorter than those of 28% or 33% vinyl acetate grades because higher-VA grades retain amorphous melt character longer. Green strength is the bond strength available before complete crystallization and is commonly evaluated on T-peel specimens under ASTM D1876. In production, bead profile retention after extrusion is also a practical green-strength indicator. Lower melt index grades such as ELVAX 460 and ELVAX 470 retain bead shape after application better than ELVAX 450. Shear adhesion failure temperature testing under ASTM D4498 is used in adhesive formulator screening. Formulation-specific values are determined by tackifier softening point, wax melt point, and substrate surface energy. Published data for this specific configuration is limited; source data from the resin supplier should not be substituted for application-specific bonding tests.
Production-scale compounding of ELVAX 460 with tackifiers, waxes, and antioxidants is typically performed on a co-rotating twin-screw extruder with 40:1 L/D ratio and modular screw sections. Barrel temperature profiles from 120 °C at the feed throat to 160–180 °C at the die are conventional for 18% vinyl acetate EVA. The polymer should be metered with a loss-in-weight feeder. Pellet bridging in the hopper is not a dominant failure mode because the pellets are free-flowing, but high ambient humidity can produce throat condensation. The main processing boundary is deacetylation of the vinyl acetate units. At melt temperatures exceeding 220 °C, acetic acid elimination accelerates. The vapor is corrosive to downstream metal components, can stain aluminum foil laminates, and increases residual acidity in the melt. Residence time at 180 °C should be controlled, specifically during line stoppages. Published manufacturer guidance for EVA hot-melt compounding recommends purging and cooling down if a stoppage exceeds several hours because viscosity degradation can be observed before visible color shift. Screw design for dispersing tackifier resin should include kneading blocks in zones after the polymer melting section. A high-shear zone placed too early can raise melt temperature and initiate degradation. On a production line, batch-to-batch variation in melt index from 2.2 g/10 min to 2.8 g/10 min can produce measurable changes in die pressure, requiring screw speed or barrel temperature adjustment to maintain coat weight.
Adjacent 18% VA grades are distinguished by melt index. ELVAX 450 at 8 g/10 min is a lower molecular weight resin that reduces pump pressure and permits lower application temperature. ELVAX 470 at 0.7 g/10 min is a higher molecular weight resin that increases cohesive strength and melt viscosity. ELVAX 460, at 2.5 g/10 min, is an intermediate. The following comparison uses manufacturer-published nominal values.
| Grade | Vinyl acetate content | Melt index, 190 °C/2.16 kg | Density |
|---|---|---|---|
| ELVAX 450 | 18% | 8 g/10 min | 0.94 g/cm³ |
| ELVAX 460 | 18% | 2.5 g/10 min | 0.941 g/cm³ |
| ELVAX 470 | 18% | 0.7 g/10 min | 0.94 g/cm³ |
When ELVAX 460 is substituted for a lower-VA grade in the 9–12% range, peel adhesion to polar substrates such as paper, wood, and aluminum generally increases because the acetate groups provide additional specific interactions. Low-temperature flexibility improves because crystallinity is reduced. The trade-off is a reduction in polyethylene-like chemical resistance and increased moisture vapor transmission. When ELVAX 460 replaces a high-VA grade in the 25–33% range, tackifier and plasticizer retention typically decreases, and the formulation sets faster after cooling. The lower polarity can reduce adhesion to polar films but improves compatibility with paraffin waxes and nonpolar tackifiers. In sealant systems, 18% vinyl acetate gives enough polarity for mineral filler wetting and enough crystallinity to limit cold flow before crosslinking. Peroxide-cured ELVAX 460 compounds are used where thermal stability and compression set are required. Crosslinking formulations should be processed below the peroxide decomposition onset temperature and above the polymer melting range. Because the grade is semicrystalline, peroxide distribution is more difficult than in amorphous high-VA grades. Published data for this specific configuration is limited, so cure studies by moving die rheometer under ASTM D5289 are necessary before specifying cure time and temperature.
ELVAX 460 is identified by CAS 24937-78-8. Under European Union REACH, the polymer is exempt from registration as a polymer under Article 2(9), but monomer registration status must be confirmed through the supply chain. Food-contact adhesive applications are evaluated under 21 CFR 175.105. Direct food-contact articles made from the polymer may require compliance with 21 CFR 177.1350 and any applicable migration limits. For electrical and electronic equipment, the RoHS recast 2011/65/EU Annex II restrictions apply to the finished article, not to the unfilled polymer. Storage should be below 40 °C and away from direct sunlight. Moisture uptake is low but increases above 60% relative humidity. Pre-drying may be required for bubble-free hot-melt coating after humid storage. The polymer should not be processed in equipment with residual strong acid or base contamination because ester hydrolysis and deacetylation can be catalyzed. No mechanical, adhesive, or regulatory performance claim is established without testing of the specific formulated compound on the intended substrate under the relevant ASTM, ISO, or DIN test method.
