| HS Code | 435852 |
| Product Type | Vinyl Acetate Ethylene (VAE) Copolymer Emulsion |
| Appearance | Milky white liquid |
| Solid Content | 55% ± 1 |
| Viscosity | 2000 ± 500 mPa·s (Brookfield, 25°C) |
| Ph | 4.5 - 5.5 |
| Glass Transition Temperature | -5°C |
| Minimum Film Forming Temperature | 0°C |
| Particle Size | 1.0 - 1.5 μm |
| Density | 1.05 g/cm³ (at 25°C) |
| Film Appearance | Transparent and flexible |
| Ionic Type | Nonionic |
| Mechanical Stability | Excellent |
| Freeze Thaw Stability | Stable up to 5 cycles |
As an accredited Dairen DA-202 VAE Emulsion factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Dairen DA-202 VAE Emulsion is packaged in 200 kg drums or 1,000 kg IBC totes for safe storage and transport. |
| Container Loading (20′ FCL) | 20′ FCL: packed in 1,000L IBCs on pallets, secured, non-hazardous VAE emulsion, loaded per weight/volume limits. |
| Shipping | Dairen DA-202 VAE Emulsion ships as a non-hazardous water-based polymer dispersion. Protect from freezing and excessive heat; ideal storage range is 5–35°C. Use clean, corrosion-resistant containers or tankers, keep sealed to prevent skinning, and avoid prolonged storage before use. |
| Storage | Store Dairen DA-202 VAE Emulsion in its original, tightly sealed container in a cool, dry, well-ventilated area. Avoid direct sunlight, extreme heat, and freezing; recommended storage temperature is 5–35°C. Prevent contamination by keeping containers clean. Use within shelf life and stir gently before use. |
| Shelf Life | Shelf life of Dairen DA-202 VAE Emulsion is 12 months from manufacture if stored sealed, protected from frost, and kept at recommended temperatures. |
Application of DA-202 to duplex lamination of low-density polyethylene film and bleached kraft paper for indirect food contact packaging demands uninterrupted wet-tack maintenance across web accelerations from 25 m/min to 48 m/min on a Polytype KM-series reverse-roll coater with a doctor blade gap set at 100–120 µm. The formulation, in which DA-202 constitutes 87–93 wt% (as-supplied emulsion) alongside a hydrogenated rosin ester dispersion at 5–10 wt% and a polyacrylate thickener at 0.15–0.35 wt%, is adjusted with aqueous ammonia to a coating pH of 4.8–5.2 and a Brookfield RVT viscosity of 350–650 mPa·s (#3 spindle, 20 rpm, 23 °C) to eliminate misting that appears above 850 mPa·s. Drying is staged across three zones: an initial radiant panel at 80–90 °C to avoid skinning, followed by impingement air at 100–110 °C for 4–6 seconds, and a final mandrel cooling drum; residual moisture below 0.8 wt% is critical to prevent blistering during heat-sealing at 160–180 °C. Compliance sits within FDA 21 CFR 175.105 for adhesives and EU Regulation (EU) No 10/2011 specifically migration testing via EN 1186-1:2002 using food simulant D1 (50 % ethanol) and D2 (vegetable oil), with a global migration limit of ≤ 10 mg/dm²; additionally, primary aromatic amine release is kept non-detectable by LC-MS/MS with a limit of quantification at 0.002 mg/kg. End articles include microwaveable paperboard soup bowls, four-corner ice-cream wrap, and triple-layered sachets for dry beverage mixes, where the peel strength determined per ASTM D1876 at a crosshead speed of 254 mm/min routinely exceeds 2.5 N/15 mm with stock tear failure modes below −5 °C.
When DA-202 is deployed as the base emulsion in structural finger-jointing adhesives for non-structural and semi-structural wood components, the workhorse formulation combines 100 parts by weight of DA-202 with 3–5 parts of a polymeric 4,4‘-methylene diphenyl diisocyanate (pMDI) crosslinker and 5–10 parts of light calcium carbonate filler, tempered with 0.2 parts of a silicone-based defoamer. The physical pot life of this blend, measured as the time for the Brookfield RVT viscosity to double from an initial 1,200–1,800 mPa·s to beyond 5,000 mPa·s at 23 °C, contracts to 28–34 minutes under ambient humidity above 65 % RH, a threshold that necessitates chilled storage of the emulsion component at 12–15 °C before inline mixing through a static mixer with 18–24 helical elements. The accelerated viscosity rise inside the narrow-bore 1.4–1.8 mm nozzle orifices of a Weinig ProfiPress or Grecon combi-head applicator creates intermittent starvation streaks that manifest as bond-line voids visible under transmitted light; pulsation dampeners and an isobaric circulation loop maintaining 0.4–0.7 MPa manifold pressure partially compensate the effect, but the measurable consequence is a drop in the average shear strength of beech wood lap joints from 9.8 MPa to 6.2 MPa when the recirculated material exceeds 15 minutes of residence time, as per testing at 2 mm/min deformation rate following EN 15497:2014. The relevant durability classification is EN 204 D4 (furniture and window scants), requiring that the delaminated area after 4 hours of boiling water immersion remains under 5 %; formulations incorporating DA-202 achieve < 3 % when the press-cycle clamping time at 0.6–0.8 MPa specific pressure extends to 90–120 seconds for oak and 60–80 seconds for spruce at wood moisture content below 12 %. End products range from laminated window scants and fire-rated door stiles to acoustic guitar neck blanks, all subject to JIS K6806 Type 1 boiling-water delamination criteria alongside indoor formaldehyde emission limits of ≤ 0.1 mg/m³ per ISO 16000-9:2006.
Aqueous dispersion application within spunlace nonwoven bonding lines for lightweight hygiene facing fabrics starts with dilution of DA-202 to a solids content of 27–33 wt% using deionized water, conditioned with 0.05 wt% of an ethoxylated acetylene diol wetting agent to reduce dynamic surface tension to 34–38 mN/m at 100 ms bubble life (Krüss BP100 tensiometer). The diluted liquor is sprayed through Impact 200-style air-atomizing nozzles operating at 0.6–0.9 bar atomization air onto a carded viscose-polyester (70:30) web moving at 100–140 m/min, achieving an add-on of 2.2–3.8 g/m² (dry) measured by inline near-infrared backscatter sensors; the web then traverses a through-air drum dryer at 125–135 °C with a residence time of 1.8–2.5 seconds, reducing residual moisture to below 0.5 %. An operational hazard arises from progressive nozzle fouling after 6–8 hours of continuous run, visible as an increase in the coefficient of variation of add-on from < 3 % to > 8 %, which is mitigated by an automated purge sequence injecting 0.5 L of warm rinse water every 90 minutes. Regulatory conformity for infant-care top-sheet applications rests on OEKO-TEX Standard 100 Annex 4 Product Class I with stringent sub-limits for extractable antimony ( < 30 mg/kg) and formaldehyde ( < 16 mg/kg via ISO 14184-1:2011), alongside a written confirmation of non-detectable alkylphenol ethoxylates (limit 100 mg/kg) under REACH Annex XVII Entry 46. The end converted articles are air-through bonded acquisition distribution layers in infant diapers, hygiene wipe substrates, and sterile wound-contact layers, where the binder must pass a skin irritation patch test per ISO 10993-10:2021 and maintain a wet-cohesion index above 85 % after saline immersion.
Formulating a virtually zero-VOC interior flat wall paint with DA-202 as the sole film-former compels tight control of pigment volume concentration (PVC) relative to the critical pigment volume concentration (CPVC) because the measured minimum film formation temperature of the neat emulsion is ~1 °C, yet the MFFT of a compounded paint containing a 68 % PVC loading of rutile titanium dioxide (TiO₂ R-706) and ground calcium carbonate (D50 8 µm) shifts upwards to 7–9 °C when no coalescent is added. To secure film integrity at application temperatures down to 5 °C, 2–3 wt% (on binder solids) of glyceryl triacetate plasticizer is introduced, keeping the Koenig pendulum hardness of a 200 µm wet-film drawdown within 28–35 oscillations after 7 days of conditioning at 23 °C/50 % RH. The paint is manufactured by dispersing the pigment extender package in water plus 0.3 % sodium polyacrylate and 0.15 % HEC thickener under a dissolver at 800–1,200 rpm for 20 minutes until a Hegman gauge reading of < 25 µm is achieved, then letting down with DA-202 at 18–23 wt% and an associative polyurethane thickener to a Stormer viscosity of 90–100 KU. Scrub resistance evaluation according to ASTM D2486-17 Method B (shim, nylon brush, 10 ml abrasive scrub medium) on a black PVC panel shows that coatings with PVC below 72 % maintain > 800 cycles before film break-through, whereas raising PVC to 78 % causes a steep decline to < 350 cycles, a cliff edge that aligns with mercury intrusion porosimetry data indicating a percolation threshold at 73 % PVC. Indoor air quality compliance is benchmarked to GB 18582-2020 with VOC content under 50 g/L determined by ISO 11890-2:2020, and a French Décret n° 2011-321 A+ label requiring total VOC emission after 28 days below 1,000 µg/m³ according to ISO 16000-9/10. The final dried coating is deployed in public-building interiors—hospitals, primary schools, social housing—as a low-odour matt finish with 85° gloss readings below 2.0 GU at 60° geometry.
| Application scenario | Primary regulatory standard | Typical addition of DA-202 | Downstream processing method | End article form |
|---|---|---|---|---|
| Paper-PE lamination for indirect food contact | FDA 21 CFR 175.105 / EU 10/2011 | 87–93 wt% as-supplied emulsion | Reverse-roll coating, tri-zone drying | Microwaveable soup bowls, ice-cream wrap |
| Finger-jointing and laminating wood adhesive | EN 204 D4, JIS K6806 | 100 phr with 3–5 phr pMDI | High-speed nozzle application, cold press | Window scants, door stiles, guitar necks |
| Spunlace nonwoven binder for hygiene | OEKO-TEX 100 Class I, REACH Annex XVII | 27–33 wt% solids diluted liquor | Air-atomized spray, through-air drying | Diaper acquisition layers, wound contact layers |
| Interior flat wall paint | GB 18582-2020, French A+ | 18–23 wt% on total formulation | High-speed dispersion, let-down mixing | Low-VOC hospital and school wall coatings |
| Tufted carpet precoat | ISO 11847 | 600–800 g/m² wet application | Puddle coater, convection curing | Carpet tiles, broadloom with secondary backing |
| Polymer-modified cementitious waterproofing | GB/T 23445-2009 Type II | 1:0.5 cement-to-emulsion solids ratio | Dual-shaft mixing, multi-pass roller application | Balcony and basement waterproofing membranes |
In tufted carpet precoat applications requiring adhesion to secondary backing, a compound consisting of DA-202 at a wet application weight of 600–800 g/m² and calcium carbonate filler is applied via puddle coater, then cured at 120–140 °C to produce carpet tiles meeting ISO 11847 delamination resistance specifications.
Designing a two-component flexible cementitious waterproofing slurry with DA-202 as the polymer modifier for indoor wet areas and below-ground tanking requires that the weight ratio of emulsion solids to P.O 42.5 ordinary Portland cement stays within 0.48 : 1.0 and 0.55 : 1.0. At this ratio, the polymer forms a co-continuous monolithic film throughout the hydrated cement matrix, yielding a 7-day tensile strength exceeding 2.2 MPa and an elongation at break of > 95 % when tested on dumbbell specimens at 200 mm/min according to GB/T 16777-2008. Field mixing uses a slow-speed dual-shaft forced-action mixer running at 45–60 rpm; the liquid component—DA-202 pre-blended with 0.3 % silicone defoamer and 0.1 % biocide—is charged first, followed by the dry blend of cement, 30 wt% 75 µm silica sand filler, and 0.15 % polycarboxylate superplasticizer, with total mixing time controlled to 3–4 minutes to limit air entrainment below 3 vol%. The slurry is roller-applied in two coats to a combined wet-film thickness of 1.2–1.8 mm at a coverage rate of 1.8–2.2 kg/m², with an intercoat interval of 4–6 hours at 23 °C; curing proceeds for 72 hours under a polyethylene sheet before exposure to water immersion. When the polymer-cement ratio is inadvertently reduced to 0.40—a common occurrence during unmeasured job-site water addition—the film-forming capacity drops, producing microcracks visible by optical microscopy at 50× magnification and reducing elongation to < 25 %, an immediate contravention of GB/T 23445-2009 Type II mandates (elongation ≥ 80 %, wet-base adhesion ≥ 1.0 MPa). On-site adhesion verification per GB/T 16777 pull-off method using 40 mm diameter dollies pressed into the cured membrane and tested at 5 mm/min tensile rate must return values not less than 1.4 MPa on a pre-wetted concrete substrate. End uses cover unexposed waterproofing linings under ceramic tiles in domestic showers, internal basement tanking, and planter box containment, where the membrane must also resist calcium hydroxide diffusion from the cement for 2,000 hours without loss of flexibility when aged in lime-saturated water at 23 °C.
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Introduced for waterborne architectural coatings and single-component adhesives, Dairen DA-202 VAE Emulsion is a carboxylated, high-solids vinyl acetate-ethylene copolymer dispersion stabilized by a surfactant system free of alkylphenol ethoxylates. The product, manufactured by Dairen Chemical Corp. in Taiwan under ISO 9001:2015 and ISO 14001:2015 registered facilities, is supplied at a nominal solids content of 55.0 ± 1.0% with a residual vinyl acetate monomer level below 0.1% as determined by gas chromatography per GB/T 20623-2006. Its design target is the replacement of conventional vinyl acetate homopolymer and EVA dispersions where wet adhesion, low-temperature film integrity, and reduced coalescent demand are required to meet VOC ceilings of 50 g/L or less under GB 18582-2020 or South Coast AQMD Rule 1113.
Unlike non-functionalized VAE grades commonly utilized in carpet-backing or nonwoven binder applications, DA-202 incorporates a built-in carboxylic acid functionality that enables post-film-formation metal-ion crosslinking at ambient temperature. The polymer backbone possesses a glass transition temperature (Tg) of approximately 0 °C by differential scanning calorimetry (ASTM D3418-21), and its minimum film formation temperature (MFFT) is reported by Dairen at ≤ 2 °C. This permits coalescent-free filming above approximately 3–5 °C substrate temperature, reducing the formulator’s reliance on high-boiling ester alcohols. The dispersion’s particle size distribution, typically monomodal with a hydrodynamic diameter of 0.8–1.2 µm as measured by laser diffraction (ISO 13320:2020), contributes to a low high-shear viscosity plateau under ICI cone-and-plate conditions (ISO 2884-1:2006), easing pumping and filter clearance in production-scale batching where 50 µm in-line strainers are used.
| Parameter | Method / Instrument | Typical Value |
|---|---|---|
| Non-volatile content | Gravimetric, 105 °C / 2 h (ISO 3251:2019) | 54–56% |
| pH | Combination electrode, 25 °C (ISO 976:2013) | 4.0–5.0 |
| Brookfield viscosity | RVF sp.3, 20 rpm, 25 °C (ISO 2555:2018) | 1,500–2,500 mPa·s |
| Density, wet state | Pycnometer, 23 °C (ISO 2811-1:2016) | 1.07–1.09 g/cm³ |
| Tg (midpoint) | DSC, 10 K/min (ASTM D3418-21) | 0±2 °C |
| MFFT | MFFT bar, gradient plate (ISO 2115:1996) | ≤2 °C |
| Surface tension | Du Noüy ring, 25 °C (ISO 304:1985) | 35–40 mN/m |
| Free monomer | GC-FID (GB/T 20623-2006) | < 0.1% |
In flat and eggshell architectural wall paints formulated between 18–25% pigment volume concentration (PVC) using TiO₂ (ASTM D476 Type II) and calcined kaolin extenders, DA-202 has been observed to deliver wet-scrub resistance exceeding 3,000 cycles before film breakthrough when tested in accordance with ASTM D2486-17 Method B (non-abrasive scrub media, 7-mil clearance film on black PVC scrub panels). This performance tier, measured after a 7-day ambient cure at 23±2 °C and 50±5% RH, positions the polymer in the upper quartile among surfactant-stabilized VAE latices for interior trade paint lines that must conform to Chinese National Standard GB/T 9756-2018 “synthetic resin emulsion coatings for interior wall” premium-grade classification. The onset of film failure in such systems is typically cohesive within the binder phase rather than adhesive at the binder-pigment interface, a failure mode consistent with the polymer’s carboxylic acid density enabling ionic crosslinking with calcium ions from extender dissolution.
Conversion of wood bonding lines from conventional plasticized polyvinyl acetate homopolymer latices to DA-202 frequently reduces volatile plasticizer content while maintaining wet tack and setting speed. In assembly tests on birch plies conditioned to 8±1% moisture content, bond strength under EN 204 D3 (cold water soak, 4 days) has been reported by compounders at ≥ 3.5 N/mm² compared to 2.8–3.2 N/mm² for a standard 50% solids PVAc homopolymer of equivalent viscosity. The DA-202-based formulation achieves these values without dibutyl phthalate or benzoate ester plasticizers, relying instead on the ethylene segment’s internal plasticization and a coalescent level below 1.0% on total formulation weight. When applied via roller coater at 60–80 g/m² wet spread rate and pressed under 0.7–1.0 MPa clamping pressure for 30 minutes at 20 °C, the adhesive develops handling strength fast enough to permit cross-cut dimensioning within 60 minutes of demolding, a critical bottle-neck metric in just-in-time furniture component manufacturing.
Operator experience from twin-screw compounding lines indicates that when DA-202 is used as the sole binder in low-VOC sealers, in-plant rheology must be managed carefully to prevent shear-thickening at pressure drops exceeding 3 bar across 250 µm cartridge filters. A pre-adjustment of the latex pH to 6.5–7.0 with dilute ammonia (28% NH₄OH, 0.05–0.1 wt% on latex) has been found to stabilize viscosity during recirculation through a Graco Merkur EH-3 diaphragm pump at a 15:1 ratio, maintaining a steady-state Brookfield RVT reading within ±150 mPa·s of the initial value over an 8-hour shift. Without this pH correction, gradual acid-catalyzed association of the carboxylated polymer can lead to microgel formation visible as a haze under dark-field microscopy at 200× magnification after 4–6 hours of continuous circulation.
Though primarily marketed for interior applications, DA-202 has been evaluated in exterior semigloss trim systems exposed at a 45° south-facing subtropical test site under ASTM G7-22. At a PVC of 22–24% and a volume solids of 35%, panels containing 2.5% (on binder solids) of a benzoate-ester coalescent and a nonionic associative thickener (HEUR, ICI builder) exhibited ΔE < 2.0 after 12 months as per CIELAB measurement per ASTM D2244-21. Early chalking assessed by ASTM D4214-07 Method A was rated at no. 8–9. However, ammonia-stabilized zinc oxide (0.25% Zn based on total formula weight) was required to suppress film embrittlement traced to UV-initiated auto-oxidation of residual acetate groups; without the zinc stabilizer, the elongation-at-break of free films (ASTM D2370-16) declined from 350% to ≤ 50% after 1,000 hours of QUV-B exposure (ASTM G154-23 cycle 1, 8 h UV at 60 °C, 4 h condensation at 50 °C). This sensitivity constrains DA-202’s outdoor use to tint bases and trim enamels where strictly controlled formulation buffers are in place.
Compared directly with Dairen DA-101, a non-functionalized VAE with 55% solids and a Tg of approximately −5 °C, DA-202 demonstrates a measurable improvement in wet adhesion to alkyd substrates. In a series of side-by-side cross-hatch tests (ASTM D3359-17 Method B, ISO 2409:2020) over a 48-hour water-saturated aged alkyd primer, DA-202 films lost ≤ 5% of squares versus 15–30% for DA-101-based films of identical coalescent content. The performance gap widens as the binder loading decreases below 300 lbs/100 gal wet paint, where DA-101’s lack of carboxylic acid functionality causes its cohesive strength to fall below the threshold required to resist osmotic blister propagation.
| Property (Test Method) | DA-202 | DA-101 (non-functional VAE) | Commercial Styrene-Acrylic (Tg 18 °C) |
|---|---|---|---|
| Wet scrub (ASTM D2486-17, cycles to failure) | 3,100–3,500 | 1,200–1,600 | 2,800–3,200 |
| Low-temp film formation (MFFT, °C) | ≤ 2 | ≤ 0 | ≥ 12 |
| Wet adhesion aged alkyd (ASTM D3359-17B, % removed) | ≤ 5 | 15–30 | 10–20 |
| ΔE after 1,000 h QUV-B (ASTM G154-23) | 2.5–3.5a | 4.0–6.0 | 1.5–2.5 |
| VOC content (g/L, minus water, GB 18582-2020 calc.) | < 50 | < 50 | 50–80 |
| a With 0.25% ZnO stabilizer added. Without ZnO, ΔE > 8.0. | |||
Electrolyte stability is moderate. The emulsion tolerates calcium ion concentrations up to 400 ppm (as CaCl₂·2H₂O added dropwise under agitation at 25 °C) before onset of viscosity inflection measured on a Brookfield LV viscometer with small sample adapter. This threshold may limit direct letdown into hard tap water sources exceeding 350 ppm total hardness without a chelating agent such as tetrasodium EDTA at 0.05% on total formula weight. In contrast, the non-functionalized DA-101 tolerates 800+ ppm Ca²⁺ without destabilization, a tradeoff accepted for the improved wet adhesion in DA-202.
Storage stability of the liquid emulsion in sealed, lined 200-L HDPE drums under warehouse conditions of 5–35 °C is specified by Dairen as 12 months from date of manufacture. Low-temperature excursions below 0 °C for more than 72 hours can induce partial freeze-thaw aggregation not reversible by simple agitation; a minimum storage temperature of 5 °C must be maintained with drum heaters or insulated blankets in unheated warehouses. After opening, the headspace must be purged with nitrogen if partial drum use extends beyond 14 days to prevent skin-over formation driven by evaporative water loss at the surface-air interface.
High-speed dispersers (Cowles-type, tip speed 18–22 m/s) can generate localized shear heating sufficient to degrade the colloidal stability of DA-202 if the letdown is executed at a latex temperature above 35 °C. The recommended procedure is to add the emulsion after the millbase has cooled to ≤ 30 °C, using a slow sweep agitator (20–30 rpm) for letdown. In continuous in-line tinting systems employing multiple dosing heads, the emulsion’s shear-stable viscosity profile permits it to pass through Coriolis mass flow meters with an accuracy of ±0.5% of reading, provided that air-entrainment is less than 2% volume as measured by an on-line entrained gas tester. In spray-applied adhesive applications using air-assisted airless spray (tip orifice 0.013–0.015 in, fluid pressure 35–55 bar), the emulsion’s low high-shear viscosity supports adequate atomization without pre-dilution; however, operators should confirm that compressed air supply dew point is held below −10 °C to avoid moisture-induced micro-coagulum in the spray pattern perimeter.
Formulation adjustments for biocidal protection must account for the emulsion’s low residual formaldehyde level (below 10 ppm by the acetylacetone method). In-can preservation with a combination of benzisothiazolinone and methylisothiazolinone at combined active levels of 15–25 ppm on total formula weight is typical for DA-202-based paints targeting zero-added-formaldehyde certification under UL 2766 or California Department of Public Health Standard Method v1.2. Dry-film fungal resistance, tested per ASTM D5590-22 over 4-week incubation with Aspergillus niger ATCC 6275, shows no growth at a zinc pyrithione loading of 500 ppm on wet paint, a performance consistent with the film’s low equilibrium moisture uptake arising from the ethylene content.
When evaluating total formulation cost, users should note that DA-202’s coalescent demand reduction—typically 0.5–1.5% on binder solids versus 3–5% for a rigid styrene-acrylic of Tg 18 °C—offsets a portion of the higher latex price per dry kilogram compared to DA-101. The precise crossover point in raw material cost per scrub cycle depends on regional coalescent pricing, but break-even analyses run at Chinese bulk distributor cost levels for Q3 2024 suggest that DA-202 becomes cost-competitive when premium-grade classification (GB/T 9756-2018) and wet scrub requirements exceed 1,500 cycles.
