| Código SH | 427939 |
| Nome Do Produto | Emulsão Dairen DA-382 VAE |
| Tipo Emulsão | Emulsão de copolímero de acetato de vinila-etileno |
| Aparência | Líquido branco leitoso |
| Conteúdo Sólidos | 55,0 ± 1,0% |
| Viscosidade | 2000 mPa · s a 25 ° C |
| O Ph | 4,5 - 5,5 |
| Densidade | 1,05 g/cm³ |
| Tamanho De Partícula | 0,5 - 2,0 µm |
| Temperatura De Transição Vítrea | 0 ° C |
| Temperatura Mínima De Formação De Filme | 1 ° C |
| Propriedade Do Filme | Filme flexível, transparente e resistente à água |
| Acetato De Vinilo Residual | Menos de 0,1% |
| Estabilidade Ao Congelamento | Não congelar-descongelar estável |
| Vida De Prateleira | 6 meses no recipiente original selado |
Como fábrica credenciada da Emulsão Dairen DA-382 VAE, aplicamos protocolos de qualidade rigorosos - cada lote é submetido a testes rigorosos para garantir padrões de eficácia e segurança consistentes.
| Embalagem | A emulsão Dairen DA-382 VAE é fornecida em tambores de aço de 200 kg, com bolsas IBC de 1.000 kg disponíveis para grandes quantidades. |
| Carga de contêiner (20' FCL) | 20 FCL: Emulsão Dairen DA-382 VAE carregada em tambores /IBCs, bloqueada com segurança, rotulada, ventilada e segregada de materiais incompatíveis. |
| Envio | A emulsão Dairen DA-382 VAE é enviada como uma dispersão aquosa estável de copolímero de acetato de vinila-etileno em tambores, bolsas ou navios-tanque a granel. Mantenha selado, protegido contra congelamento e armazene entre 5 e 35 ° C. Não é regulamentado como mercadoria perigosa sob condições padrão, mas evite calor excessivo e armazenamento prolongado. |
| Armazenamento | Guarde Dairen DA-382 VAE Emulsion em seu recipiente original bem fechado em uma área fria, seca e bem ventilada, longe da luz solar direta e fontes de calor. Proteja do congelamento; a temperatura ideal de armazenamento é entre 5 ° C e 35 ° C. Mantenha os recipientes em pé e evite contaminação. Use dentro de 6 meses após a recepção. Siga todas as instruções de segurança. |
| Prazo de validade | A vida útil é tipicamente de 6 meses a partir da fabricação quando armazenado selado às temperaturas recomendadas, protegido do congelamento. |
Preços competitivos Emulsão Dairen DA-382 VAE que se ajustam ao seu orçamento - termos flexíveis e orçamentos personalizados para cada encomenda.
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!
A carboxylated vinyl acetate-ethylene (VAE) copolymer dispersion, Dairen DA-382 is supplied at a nominal solids content of 54–56%, a pH of 4.5–5.5, and a Brookfield LVF viscosity (spindle #3, 60 rpm, 25°C) in the range of 1,500–3,000 mPa·s. The emulsion carries an anionic surfactant stabilization system with a small fraction of nonionic surfactant to balance mechanical shear stability, and exhibits a minimum film formation temperature (MFFT) of 0°C without external plasticization. This characteristic derives directly from the randomly distributed polyethylene segments that disrupt poly(vinyl acetate) crystallinity, lowering the effective glass transition temperature (Tg, DSC midpoint) to approximately +5°C. Unlike conventional poly(vinyl acetate) homopolymer dispersions that require 5–12% dibutyl phthalate or benzoate plasticizer to achieve ambient-temperature film formation, DA-382 contains no migrating low-molecular-weight additives; the cohesive properties remain constant over 10-year simulated aging cycles (Arrhenius-extrapolated from 70°C oven data per ASTM D3045-92). The product is manufactured by Dairen Chemical Corporation and classified as a non-hazardous aqueous dispersion under REACH (EC) 1907/2006 and OSHA HCS 2012. Published data for shelf-life decay kinetics under tropical warehouse conditions is limited, but routine production batches retain viscosity within ±20% of initial values after 12 months at 20°C in sealed HDPE totes.
| Performance Attribute | DA-382 VAE Emulsion | Conventional Plasticized PVAc Homopolymer | Reference Standard |
|---|---|---|---|
| Plasticizer migration within laminate interlayer | None detected (extraction GC-MS, detection limit 0.01 mg/m²·day) | Observed within 30 days at 40°C; phthalate bloom visible on surface | ASTM F1249-20 (moisture rate basis, adapted) |
| MFFT (°C) | 0 | +14 to +18 (requires 3–5% coalescing solvent in formulation) | ASTM D2354-10 |
| Peel adhesion to corona-treated LDPE film (N/25mm) | 12–18 (fiber-tear failure in paper-backed constructions) | 3–8 (adhesive failure at LDPE interface) | ASTM D903 modified (180° peel, 300 mm/min) |
| Wet tack after 30 s open time (probe tack, g/cm²) | >220 (loop tack equivalent, Kraft paper substrate) | 80–120 | Internal method based on ASTM D6195-22 |
| Water resistance (peel retention after 24 h immersion at 23°C) | 65–80% of initial peel strength (uncrosslinked); >90% with 0.3% glyoxal crosslinker | 0–20%; adhesive re-emulsification dominates | DIN EN 204 durability class D2, adapted for film-backed laminates |
| VOC content (g/L, calculated per emission) | <1 (water only) | 25–40 (from free plasticizer and solvent) | ASTM D6886-18 |
When DA-382 is applied via direct gravure or reverse gravure coating on high-speed laminating lines, the principal throughput constraint is not drying capacity but the rheological profile of the emulsion under the extreme shear rates encountered in the nip. Brookfield low-shear viscosity of 2,000–2,500 mPa·s (spindle #3, 20 rpm) does not predict coat-weight stability above 120 m/min line speed. Cone-and-plate viscometry at 10,000 s⁻¹ (ICI method, 23°C) reveals that DA-382 viscosity collapses to <100 mPa·s, approaching Newtonian behavior. In a gravure cylinder with 200 LPI engraving and a cell depth of 35 µm, this viscosity drop leads to centrifugal expulsion of adhesive from cells before transfer, producing a starved, non-continuous film. The critical shear rate at which film-split transitions from laminar to filament-dominated defect regime is 8,000 s⁻¹ for neat DA-382. Below this threshold, a uniform coat weight of 3–5 g/m² dry can be maintained; above it, coat weight falls to <1.5 g/m² with pinhole densities exceeding 10/cm² as quantified by methylene blue dye penetration test. Line operators can mitigate this by introducing an alkali-swellable acrylic thickener (ASE type, 0.3–0.8% on total formulation weight) to restore high-shear viscosity to 150–200 mPa·s at 10,000 s⁻¹. However, thickener dosage must not exceed 1.0%: above this concentration, steric incompatibility between the hydrophobically modified acrylic thickener and the carboxylated VAE surface leads to microgel formation visible as grain in the dried film. Process control relies on continuous in-line viscosity monitoring via a Coriolis meter positioned downstream of the roller nip return line, with an alarm threshold set at a high-shear viscosity deviation of ±15% from target.
A secondary limitation emerges in the drying tunnel. The ethylene segments reduce water retention compared to fully hydrolyzed PVAc dispersions, causing skin-over at air temperatures above 110°C. When a porous paper web is laminated to a non-porous BOPP film using DA-382 at 3 g/m² dry weight, infrared pyrometry readings on the web surface must not exceed 105°C during the first 4 seconds of residence time; exceeding this threshold traps steam blisters at the adhesive-film interface because the semi-permeable VAE film coalesces before bulk water escapes. The blistering failure rate follows an Arrhenius-like dependence on peak web temperature, doubling for every 5°C rise above 105°C within a 3-second dwell. Production-scale retrofits often require replacing the initial radiant zone with a forced-convection zone delivering 60°C air at 8 m/s for 1.5–2.0 seconds before entering the high-intensity IR section, a configuration validated on a 1.3 m wide Kroenert laminator at a line speed of 150 m/min.
Dairen DA-382 finds extensive use in the lamination of reverse-printed BOPP or PET films to paperboard and corrugated stock for luxury packaging. The open time at 23°C /50% RH intervals, measured by the time-to-loss-of-tack on Kraft paper using a 100 µm wet film drawdown, ranges from 60 to 90 seconds for the neat emulsion. This window permits manual positioning of sheet-fed substrates before nip consolidation. Wet tack, quantified by a loop tack fixture on an Instron at a separation rate of 300 mm/min, develops to 220 g/cm² within 30 seconds of contact and exceeds 350 g/cm² after 60 seconds. Such immediate grab is sufficient to eliminate clamping fixtures during assembly, reducing Takt time on manual layup stations. When a heat-resistance requirement above 60°C is specified—as in digital print finishing where toner fuser rollers reach 120°C—DA-382 must be crosslinked. A 0.3% addition of glyoxal-based crosslinker (added as a 20% aqueous solution immediately before application) raises the shear adhesion failure temperature (SAFT, ASTM D4498, 1 kg load, 2°C/min ramp) from 45°C to 78°C. Dosing errors above 0.5% glyoxal do not further improve heat resistance but reduce peel adhesion to untreated PET by 30–40% and impart a yellow shift (Δb> 3.0 after 24 hours at 50°C) that is unacceptable for transparent overlays. Pot life of the catalyzed adhesive is 8–10 hours at 23°C; beyond this interval, a gradual increase in viscosity exceeding +30% from precrosslinking in the liquid state can plug filtration screens (100 µm mesh) on gravure supply lines.Uncrosslinked DA-382 films absorb approximately 8–12% moisture by mass when conditioned at 40°C /90% RH for 7 days (ASTM D1151-00, temperature-humidity cycling). This plasticization effect lowers the dynamic storage modulus (E’) by 30–40% at 25°C as measured by DMA (1 Hz, tensile mode), shifting the glass transition onset down to approximately −8°C. In a stacked paperboard tray bonded with DA-382 and subjected to a static compressive load of 1.5 kN/m² under the same humid conditions, creep deflection exceeds 3 mm after 72 hours, compared to <0.5 mm for the crosslinked variant. QA protocols at converting facilities in Bangkok and Ho Chi Minh City frequently mandate a 72-hour wet-aging test (wrapped sample at 38°C /95% RH) with a bond-strength retention threshold of 60% relative to dry controls; neat DA-382 formulations meet this threshold on paper-to-paper bonds but fall below 50% on paper-to-aluminum foil laminates unless the film is post-crosslinked or blended with a minor fraction of a higher-Tg styrene-acrylic dispersion. No evidence of microbiological decay has been observed in DA-382 films containing the standard in-can preservative package (CMIT/MIT, 15 ppm active) even after 28 days at 30°C /85% RH in a modified ASTM G21-15 fungal resistance test.
The surfactant-stabilized nature of DA-382 permits blending with partially hydrolyzed polyvinyl alcohol (PVOH) solutions to tune rheology and green strength without inducing catastrophic coagulation, but the blending window is narrow. PVOH grade 4-98 (degree of hydrolysis 98.0–98.8 mol%, 4% aqueous solution viscosity 25–30 mPa·s) added as a 10% solution at a level of 5–10 parts per hundred parts of DA-382 emulsion solids increases the low-shear viscosity to 6,000–8,000 mPa·s and imparts a distinct yield stress of 15–25 Pa (Casson model), preventing adhesive migration into porous paper stocks during lamination. At PVOH addition levels above 12%, a time-dependent viscosity rise occurs over 48 hours of storage at 23°C, attributed to bridging flocculation between PVOH chains and the carboxylated VAE particle surfaces. This manifests as an increase in residual 200-µm sieve gels by more than 500 ppm and leads to streaking defects on gravure-coated film. In contrast, blends with fully hydrolyzed PVOH grades (>99% hydrolysis) display immediate grit formation, confirming the incompatibility warning on the manufacturer’s SDS: avoid combination with strongly hydrogen-bonding polyols at concentrations exceeding 5% without compatibility testing via turbidity titration.
