| HS Code | 411650 |
| Product Name | Dairen DA-265H VAE Emulsion |
| Polymer Type | Vinyl Acetate Ethylene (VAE) Copolymer |
| Appearance | White milky liquid |
| Solid Content | 55 ± 1 |
| Viscosity Cps | 1500 - 2500 (Brookfield, 25°C) |
| Ph | 4.5 - 6.0 |
| Particle Size μm | 1.0 - 2.0 |
| Glass Transition Temperature C | -5 |
| Minimum Film Forming Temperature C | 0 |
| Density G Cm³ | 1.05 - 1.07 |
| Surface Tension Dyn Cm | 36 - 40 |
| Ionic Type | Non-ionic |
| Film Flexibility | Excellent |
| Film Transparency | Clear and colorless |
| Water Resistance | Good |
As an accredited Dairen DA-265H VAE Emulsion factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Dairen DA-265H VAE Emulsion is supplied in 200 kg net weight drums, sealed for stability and easy handling. |
| Container Loading (20′ FCL) | Dairen DA-265H VAE Emulsion is loaded in a 20′ FCL using palletized drums or IBCs, secured to prevent shifting. |
| Shipping | Dairen DA-265H VAE Emulsion ships in sealed drums, IBC totes, or bulk tankers. Protect from freezing and temperatures above 40°C to prevent coagulation. Store upright, keep containers sealed, and use standard PPE during handling. Non-hazardous cargo, but ground bulk transfers and contain spills promptly. |
| Storage | Store Dairen DA-265H VAE Emulsion in sealed original containers in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and freezing conditions. Maintain storage temperature between 5°C and 40°C to prevent coagulation or degradation. Keep containers tightly closed to avoid contamination, moisture ingress, and skinning. Use within recommended shelf life and rotate stock. |
| Shelf Life | Shelf life is typically 12 months from manufacture when stored in sealed, original containers between 5–35°C. |
High-speed disperser charge sequencing for Type II wood bonding requires careful management of shear-induced heat to prevent localized gelation when DA-265H is introduced alongside polyvinyl alcohol stabilizers and calcium carbonate filler. In a typical batch process using a 45° pitched-blade turbine at tip velocities of 12–18 m/s, the emulsion is added after the pigment-filler pre-dispersion has cooled to below 35 °C, maintaining a final blend viscosity between 8 000 and 14 000 mPa·s (Brookfield RV, spindle #6, 20 rpm) to enable clean roll-coating onto rotary-cut beech or oak veneer. The formulation generally adheres to the ratio 100.0 phr DA-265H, 5.0–8.0 phr dibutyl phthalate or benzoate plasticizer, 10.0–20.0 phr calcium carbonate (5 µm median particle size), and 0.3–0.5 phr biocide, yielding a dry film with a glass transition onset near 0 °C as measured by differential scanning calorimetry at 10 K/min under nitrogen. Assembly bond performance is validated against EN 204:2016 Durability Class D3 (Type II interior with frequent short-term exposure to water) through a three-cycle test per clause 5.3.3: after immersion in water at 20 ± 2 °C for 4 days, specimens must retain a minimum tensile shear strength of 2.0 N/mm² for a cohesive wood failure exceeding 70 %. Cold-press operations at 0.8–1.2 MPa for 30–60 minutes are common, though high-frequency hot-pressing at 80–90 °C and 0.5 MPa shortens the cycle to 3–5 minutes, exploiting the accelerated water evaporation and ethylene-segment coalescence of the VAE matrix. The final bonded components appear in interior furniture, laminated timber door stiles, finger-jointed solid wood panels, and multilayered parquet top layers.
When converting reels of double-clay-coated solid bleached sulphate (SBS) at line speeds from 200 to 400 m/min, the adhesive must resist excessive penetration into the base stock while wetting the kaolin-latex coating surface sufficiently to develop peel adhesion. DA-265H, compounded with an aqueous rosin ester dispersion (acid number 160–180 mg KOH/g, softening point 70–85 °C) at a weight ratio of 75:25 to 85:15 solids-on-solids, delivers a controlled pseudoplastic response with a high-shear viscosity measured at 2 500 cP (ICI Cone & Plate viscometer, 10 000 s⁻¹, 23 °C) that prevents misting during the doctor blade metering step on a multi-roll gravure applicator. Microwave moisture sensors positioned after the drying hoods—typically set to 105–120 °C air temperature for 2–4 seconds dwell—trigger feedback loop adjustments to hold residual moisture between 5.5 % and 7.0 % by Karl Fischer titration, a narrow window that prevents blistering when the laminate passes over a chill roll at 12 °C before sheeting. Compliance for food-contact applications is mandated by FDA 21 CFR 176.170 (components of paper and paperboard in contact with aqueous and fatty foods) and 21 CFR 176.180 (paper and paperboard in contact with dry food), requiring extractives not to exceed 0.5 mg/in² of food-contact surface under Conditions of Use B through H. Additional conformance to European Regulation (EC) No 1935/2004 and its specific measure for paper BfR Recommendation XXXVI/1 is achieved when the dried film contains less than 1 000 mg/kg free vinyl acetate monomer, confirmed by headspace gas chromatography with flame ionization detection. End-use formats include frozen food carton laminations, liquid packaging board for aseptic brick overwraps, side-seam and bottom-patch adhesives on multiwall paper sacks, and spot-coated security envelopes.
Formulators targeting EN 13300 Class 2 wet scrub resistance (abrasion cycle count ≥ 50 at 23 °C using the ISO 11998:2006 method) often replace a fraction of the titanium dioxide with fine-particle calcined clay to push the pigment volume concentration above 55 %, which stresses binder efficiency. DA-265H, introduced into the letdown phase at 18–22 wt% on total wet paint weight, provides a Young’s modulus below 150 MPa at 50 % relative humidity—measured by dynamic mechanical analysis at 1 Hz—that tolerates the dimensional movement of gypsum plasterboard without micro-cracking. The grind phase in a pin-type horizontal media mill with 0.6–0.8 mm yttria-stabilized zirconia beads disperses anatase TiO₂, calcined kaolin, and precipitated calcium carbonate to a Hegman gauge value of 5.5–6.5, and the subsequent letdown tank receives this pigment dispersion under a Cowles-type dissolver at 600–800 rpm along with the VAE emulsion, a hydrophobically modified ethoxylated urethane (HEUR) associative thickener at 0.3–0.5 wt%, and a non-ionic coalescent at 1.5–2.0 wt% on emulsion solids to depress the minimum film-forming temperature to approximately 2 °C. Internal quality assurance protocols link core compliance metrics to the French Décret n° 2011-321 for VOC emissions labelling (Class A+ requires ≤ 1 000 µg/m³ total volatile organic compounds after 28 days in chamber testing per ISO 16000-9) and to the German AgBB scheme for health-related evaluation of construction products, where the area-specific emission rate must not exceed 100 µg/m³ for individual carcinogenic substances. The cured film additionally meets the accelerated weathering requirements of ASTM D2486-17 with a relative abrasion loss of less than 30 % compared to a control alkyl emulsion under a filament-worn nylon brush after 400 cycles. Terminal products bearing this formulation architecture are commercial-grade interior matt wall paints for schools, hospital corridors, hotel lobbies, and high-traffic residential common areas where frequent surface cleaning justifies the superior film integrity.
Rotary screen printing of pigment-dyed cotton knit for fast-fashion jersey garments demands a low-viscosity print paste that can be pumped through nickel mesh screens ( 80–125 mesh, open area 25–40 % ) at a shear rate above 1 000 s⁻¹ inside the squeegee nip while instantly recovering its structure to prevent penetrating the fabric back. DA-265H, adjusted to a solids content of 40–45 % with deionized water and thickened with a high-molecular-weight acrylic acid copolymer inverse emulsion ( 1.2–1.8 % on print paste weight ) to a final viscosity of 12–18 dPa·s (Brookfield RV, spindle #6, 20 rpm), functions as the pigment binder in all-aqueous clear concentrates. The binder-to-pigment ratio is maintained at 2.5:1 to 3.5:1 (solids weight basis), while dry crock fastness—tested according to ISO 105-X12:2016 with a finger wrapped in cotton rubbing cloth using a 9 N load for 10 cycles—is enhanced by incorporating 0.3–0.6 % (on binder solids) of a blocked polyisocyanate crosslinker, which activates at the curing temperature of 150–160 °C for 3 minutes in a gas-fired hotflue. Wet adhesion to regenerated cellulosic fibers and polyester blends is confirmed through AATCC TM61-2013 Test 2A washing at 49 °C, with a color change rating of 4 (grey scale) considered acceptable for light-colored prints. The entire print system must align with the ZDHC Manufacturing Restricted Substances List (MRSL) Version 3.1, prohibiting detectable levels of alkylphenol ethoxylates and perfluorinated compounds, and carry a valid OEKO-TEX Standard 100 certification for Product Class II (direct skin contact) with a 75 mg/kg limit on free formaldehyde by the Japanese Law 112 method. Output garments include screen-printed T-shirts, sweatshirts with plastisol-replacement water-based designs, and home textile articles employing metallic foil transfer adhesives on woven polyester-cotton blends.
Hydroentangled nonwovens built from viscose-polyethylene terephthalate blends (30:70) at a basis weight of 40–60 g/m² often fail to exceed a cross-direction wet tensile strength of 3.0 N/5 cm after a 5-minute water saturation test (EDANA NWSP 010.0.R1), requiring a post-bonding treatment to gain structural integrity for converting operations. A continuous foam-impregnation unit equipped with a rotor-stator foam generator operating at 1 500 rpm delivers a wet foam of DA-265H emulsion diluted to 10–14 % bath solids, formulated with 0.05–0.15 % (on bath weight) of a cationic surfactant to adjust foam density to 80–120 g/L and half-life to 180–240 seconds. The padded web is conveyed through a multi-zone air-lay oven where the first zone at 80 °C collapses the foam evenly, the second zone at 120 °C removes bulk water, and a final calendered zone at 140 °C for 6–8 seconds residence time induces film formation, yielding an add-on level of 4.5–7.0 % dry binder on fabric weight as confirmed by near-infrared reflectance inline at 1 450 nm. Biocompatibility prerequisites for medical-grade substrates refer to ISO 10993-5:2009 (cytotoxicity, elution test using L929 fibroblasts with cell viability > 70 % after 24-hour incubation) and ISO 10993-10:2013 (skin irritation potential), while FDA 21 CFR 177.1520 olefin polymer limitations apply when the binder contacts non-fatty food surfaces in wiping cloths. The material also meets the Nordic Swan Ecolabel for hygiene products, which caps total volatile organic residues at 1 500 µg/m³ after 3 days in a 23 °C test chamber. Converted goods emerge as pre-moistened facial wipes, disposable surgical drapes, sterile operation-gown reinforcement strips, and industrial lens-cleaning tissues where low linting characteristics derived from the VAE’s solution-like film properties are critical.
Two-component slurry-applied waterproofing membranes that blend ordinary Portland cement (CEM I 42,5N), graded silica sand (0.1–0.6 mm), and DA-265H in a polymer-to-cement ratio (p/c) of 0.25–0.40 by weight dry solids develop a film exhibiting an elongation at break of ≥ 80 % after 28 days of wet curing at 23 ± 2 °C and 90 % relative humidity, as evaluated by ISO 37:2017 Type 2 dumbbell specimens at 500 mm/min crosshead speed. The incorporation of a defoamer based on mineral oil and hydrophobic silica ( 0.2–0.4 wt% on liquid component ) reduces entrapped air to a pore-free film with a water impermeability coefficient meeting the 0.3 MPa for 30 minutes criterion in JC/T 864-2008 for polymer-modified cementitious waterproof coatings. Crack-bridging ability at low temperature is verified through the method of ASTM C1305-06 at -10 °C for cycles 0 to 10, requiring a continuous membrane with no visual cracks over a static crack of 1.0 mm on a concrete substrate. The formulation remains stable under intermittent shear from a variable-speed drill-driven paddle mixer at 300–500 rpm for 3–5 minutes pot life extension, ensured by a pH buffer system that keeps the continuous phase above pH 7.5 to delay cement hydration flash-setting when the emulsion is initially dispersed. Full compliance is traceable to Chinese National Standard GB/T 23445-2009 for polymer-modified cement waterproofing slurry, which mandates a tensile strength retention of ≥ 80 % after 500 hours of accelerated UV aging (Xenon-arc, 340 nm, 0.51 W/m² irradiance) and water absorption below 10 % by mass. Target products include below-grade basement tanking membranes, wet-room under-tile waterproofing layers in mechanical-fixation points, and exposed pedestrian terrace coatings where the UV stability of the VAE-encapsulated cement matrix prevents chalk-resistant deterioration beyond 5 years of exterior exposure.
| Application | Primary Regulatory Standard | Key Performance Test | Required Value / Pass Criterion |
|---|---|---|---|
| Wood Assembly D3 | EN 204:2016 | Tensile shear after 4-day cold water immersion | ≥ 2.0 N/mm² |
| Paperboard Lamination (food contact) | FDA 21 CFR 176.170, 176.180 | Total extractives at usage temperature | ≤ 0.5 mg/in² |
| Interior Matt Coating | French A+ / ISO 16000-9 | TVOC after 28 days chamber test | ≤ 1 000 µg/m³ |
| Textile Pigment Print | OEKO-TEX Std 100, Class II | Formaldehyde content (Japanese Law 112) | ≤ 75 mg/kg |
| Medical Nonwoven Binder | ISO 10993-5:2009 | Cytotoxicity, L929 fibroblast viability | > 70 % |
| Cementitious Waterproof Slurry | JC/T 864-2008 | Water impermeability at 0.3 MPa | No leakage after 30 min |
| Application Scenario | DA-265H Loading (solids basis) | Critical Processing Control Point | Acceptable Operational Window |
|---|---|---|---|
| Type II Wood Adhesive | 80–90 % of liquid phase (as-supplied emulsion) | Dispersion temperature during filler addition | 28–35 °C |
| High-Speed Packaging Laminate | 75–85 phr (blended with tackifier dispersion) | Gravure cylinder gap metering and viscosity at 10 000 s⁻¹ | 2 200–2 800 cP |
| Architectural Interior Flat Paint | 18–22 wt% on total wet paint | Letdown dissolver RPM and associative thickener equilibration time | 600–800 rpm / 20–30 min holding |
| Screen-Printed Garment Binder | 15–20 % binder solids on print paste | Curing oven dwell time and peak web temperature | 150–160 °C / 2.5–3.5 min |
| Nonwoven Impregnation | 10–14 % bath solids, targeting 4.5–7.0 % dry add-on | Foam density and half-life before padder | 80–120 g/L / 180–240 s |
| Two-Part Cementitious Membrane | p/c ratio 0.25–0.40 (dry polymer/cement mass) | Mix pot life before viscosity increase beyond 20 000 mPa·s | 25–40 min at 23 °C |
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Dairen DA-265H is an aqueous vinyl acetate-ethylene (VAE) copolymer emulsion stabilized with a polyvinyl alcohol (PVOH) protective colloid system. The ethylene comonomer, incorporated at a level typical of high-flexibility VAE grades, permanently plasticizes the vinyl acetate backbone, yielding a film with a glass transition temperature (Tg) significantly lower than that of a comparable PVAc homopolymer. The dispersion is supplied at a nominal solids content of 54–56 % (ISO 3251) with a pH of 4.0–5.5 and a Brookfield viscosity (ISO 2555, RVT spindle 5/20 rpm at 23 °C) within the range specified on the manufacturer’s technical data sheet. The minimum film-forming temperature (MFFT, ISO 2115) is typically below 0 °C, permitting coalescence without high-boiling coalescing solvents in many formulations. DA-265H is designed for use in low-VOC interior architectural coatings, single-component construction adhesives, packaging lamination, carpet backing, and nonwoven binder applications where low-temperature flexibility and adhesion to non-polar substrates are required. The colloidal stabilization mechanism imparts shear stability suitable for high-speed pump transfer and roller-applied wet-end processes, with typical mean particle sizes falling between 0.8 and 1.5 µm as measured by laser diffraction (ISO 13320).
The incorporation of a high ethylene fraction modifies the copolymer backbone in several measurable ways that directly affect film properties and application performance. In homopolymer PVAc, the Tg resides near 30 °C, necessitating external plasticizers or coalescing agents to achieve film formation at ambient temperature. DA-265H, by virtue of internal plasticization, delivers dry film elongations exceeding 300 % and cold flexibility to below −15 °C. This ethylene modification also reduces the hydrophilicity of the acetate polymer, imparting improved water-whitening resistance and alkali resistance relative to homopolymer dispersions. The table below compares the characteristic property envelope of a high-ethylene VAE emulsion (DA-265H class) with that of a conventional PVAc homopolymer, using industry-standard test methodologies. Specific numerical values for DA-265H as produced in various plant campaigns are documented in the current lot-specific certificate of analysis available from Dairen Chemical Corporation.
| Property | Test Method | Typical PVAc Homopolymer | High-Ethylene VAE (DA-265H Class) |
|---|---|---|---|
| Glass transition temperature (Tg) | DSC (ISO 11357-2) | +28 to +33 °C | −15 to +5 °C |
| Minimum film-forming temperature | ISO 2115 | +15 to +18 °C | < 0 °C |
| Dry film elongation at break | ISO 527-3 (film, 200 µm) | 10–25 % | 300–650 % |
| Water whitening (24 h immersion) | Internal method, visual | Opaque, white | Translucent to slight haze |
| Adhesion to untreated polypropylene | Cross-cut (ISO 2409) | Classification 4–5 (failure) | Classification 1–2 (partial acceptance) |
| Alkali resistance (pH 12 soak) | Film integrity after 48 h | Film dissolution within 6 h | Film intact, softened |
In comparison with lower-ethylene VAE grades (those containing < 10 wt% ethylene), DA-265H exhibits a markedly lower MFFT and greater flexibility at sub-zero temperatures, but its cohesive strength and heat resistance are correspondingly reduced. The practical consequence is that DA-265H is preferred in applications where substrate movement, thermal expansion mismatch, or end-use low-temperature exposure are dominant performance drivers, whereas lower-ethylene VAE emulsions are selected where higher modulus and elevated-temperature creep resistance are prioritized.
In pressure-sensitive adhesive coatings intended for removable labels and protective films, the high elongation and permanent tack of DA-265H films allow the adhesive to conform to low-energy surfaces without requiring aggressive adhesion promoters. Transfer coating onto siliconized release liner is performed using a comma bar coater at a wet film thickness of 50–100 µm, followed by three-zone forced-air oven drying with zone temperatures of 80, 110, and 120 °C. The dried film is then laminated to 50 µm corona-treated polyethylene at a nip pressure of 0.4 MPa. Production-scale trials on a 1.3 m wide pilot coater at line speeds of 40–80 m/min have been documented, showing that crosslinking with 0.3–1.0 phr aluminum acetylacetonate extends the holding power (shear adhesion failure temperature, PSTC-107) into the 80–100 °C range while retaining loop tack values on stainless steel (PSTC-16) exceeding 8 N/25 mm. Pot life of the compounded adhesive, determined as the time required for Brookfield viscosity to double at 23 °C, is typically 4–6 hours; applications using pre-heated transfer lines to reduce viscosity must thus balance throughput against progressive viscosity build. Incompatibility is observed with strong acid catalyst residues from certain tackifier dispersions; neutral or mildly alkaline hydrocarbon resins should be used to preserve colloidal stability.
When compounded with reactive crosslinkers, DA-265H can be formulated into waterborne wood adhesives meeting the durability requirements of EN 204 classe D2 and D3 for interior non-structural and limited-humidity interior applications. A formulation comprising DA-265H, 5–15 phr glycidyl silane adhesion promoter, and 2–5 phr polymeric MDI has been shown to pass the 4-hour water soak test of EN 204 D3 when the bond is cured under a specific pressure of 1.0 MPa for 2 hours at 20 °C and subsequently conditioned for 7 days at 23 °C / 50 % RH per EN 205. Full-scale production on a radio-frequency edge-gluer (operating at 3 kW, 27.12 MHz) achieved a set time of 15–20 seconds for 18 mm beech lamellae, with hot-press throughput constrained primarily by the moisture equilibration of the glued assembly. The processing window narrows considerably when ambient relative humidity exceeds 65 %: wood moisture content above 12 % retards bond strength development because water release into the substrate is impeded, and published data for this specific configuration is limited. Plant-scale experience indicates that when the equilibrium moisture content of the wood exceeds 14 %, a 24-hour clamping period should replace the standard 2-hour cycle to achieve equivalent shear strength. Substrate temperature during winter workshop conditions frequently falls below the 5 °C minimum film formation temperature of the uncrosslinked emulsion; in-line infrared pre-heating of the wood surface to 8–10 °C is recommended to ensure adequate wetting and coalescence. The adhesive is not suitable for full exterior exposure (EN 204 D4) and should not be used in direct contact with groundwater.
Historically, carpet tile manufacturing lines employing puddle coaters with a doctor bar at a gap of 0.8–1.5 mm have evaluated DA-265H as a replacement for styrene-butadiene rubber (SBR) latex in precoat and secondary backing applications. Tuft bind values, tested per ASTM D1335 on cut-pile nylon carpet, remain above 22 N when the precoat compound is loaded with 200–350 phr calcium carbonate (d50 approx. 3 µm) and applied at a dry add-on of 180–220 g/m². Subsequent lamination of a polypropylene secondary backing using a 40–80 g/m² dry coating of DA-265H compound and routing through a 15 m convection oven at 130–145 °C for 3–5 minutes yields delamination strengths (ASTM D3936) exceeding 7 N/50 mm before accelerated aging. Compatibility with bitumen, PVC plastisol, and polyurethane foam secondary backings has been verified by 90° peel testing at ambient and after aging for 7 days at 70 °C in a forced-air oven per ASTM D3045. The colloidal stabilization of DA-265H is sensitive to filler grade and loading: when coarse calcium carbonate (d50 > 15 µm) is incorporated above 400 phr, high-shear compounding in a Cowles disperser operating at tip speeds greater than 15 m/s can initiate grit formation as the protective colloid is mechanically displaced from the emulsion surface. A laboratory-scale jar test following ASTM D869 for sedimentation and coagulum evaluation, using the specific filler lot sourced from the plant, is recommended before any scale-up campaign. Drying rate profiling on an actual line equipped with near-infrared moisture sensors demonstrated that residual moisture below 0.8 % at the wind-up station is required to prevent blocking in roll storage; this necessitates active control of line speed relative to oven temperature, particularly during humid summer conditions.
The sub-zero MFFT of DA-265H eliminates the requirement for volatile coalescing solvents such as texanol or butyl carbitol, directly reducing initial paint VOC content to below 1 g/L in a flat formulation with a pigment volume concentration (PVC) of 65–78 %. Scrub resistance testing according to ASTM D2486 on a 200 µm wet film drawdown over sealed Morest chart paper indicates that DA-265H-based paints achieve 1000–1500 cycles before failure when the binder content is maintained above 12 wt% on total formula. Wet adhesion, evaluated per DIN EN 13300 using a 24-hour water immersion followed by a wet scrub brush, is characterized by complete film retention, whereas standard PVAc homopolymer paints typically exhibit cohesive failure within 100 cycles. In contrast to styrene-acrylic benchmarks, DA-265H films exhibit lower early water resistance; the coating is therefore specified for interior service under intermittent humidity, corresponding to ISO 13788 Class 2 conditions, and is not recommended for bathrooms, showers, or kitchen splash zones without a protective topcoat. Airless spray application trials employed a 0.015–0.017 inch reversible tip at 12–15 MPa fluid pressure with a 30-mesh in-line filter. Production batches prepared in 800 kg IBC totes and agitated with a slow-speed propeller mixer at 50–100 rpm showed no visible sedimentation for 72 hours. Interaction with associative thickeners of the hydrophobically modified ethoxylated urethane (HEUR) type must be accounted for: dosage of 0.3–0.6 % by weight on total formulation provides a mid-shear Stormer viscosity of 95–105 KU (ISO 2884-2), but over-addition beyond 0.8 % induces phase separation as the ethylene-rich binder segments interact with the thickener hydrophobes. Protect from freezing during transport and storage; one freeze-thaw cycle without 5 % added propylene glycol results in irreversible grit formation.
In high-loft nonwoven wiping cloth manufacture, DA-265H diluted to 15–20 % solids is applied via spray bonding in a Schott & Meissner through-air bonding line operating at 20–60 m/min. The dried web, consolidated at 135 °C for 40 seconds, exhibits machine-direction tensile strength per DIN EN 29073-3 in excess of 18 N/50 mm at a basis weight of 65 g/m² and a binder add-on of 20 %. The PVOH protective colloid imparts a degree of hydrophilicity that can be beneficial for cleaning applications but also leads to film swelling under continuous water immersion. Crosslinking with 1–2 % glyoxal on binder solids reduces water absorption by mass to 25–30 % after 1 hour soak, but increases the Tg of the film by approximately 8–12 °C, rendering the nonwoven brittle at −10 °C. Plant-scale correlation of infra-red dryer emitter temperature with residual moisture has shown that a surface temperature exceeding 150 °C at the dryer exit causes yellowing of the PVOH-stabilized film; the binder supplier’s maximum processing temperature guideline of 145 °C should be observed to maintain color integrity. The emulsion is not compatible with glyoxal-based crosslinkers that have dropped pH below 3.5 due to acid hydrolysis residues; premixing the crosslinker with a buffered deionized water stream to pH 6.0–7.0 before addition to the diluted emulsion avoids localized coagulation at the injection point.
