| Código SH | 953069 |
| Nome Do Produto | Emulsão de copolímero de acetato de vinilo-acrilato |
| Natureza Química | Acetato de vinila copolimerizado com monômeros de acrilato em emulsão aquosa |
| Aparência | Líquido branco leitoso a esbranquiçado |
| Conteúdo Sólido | 50-55% |
| Viscosidade | 500-3000 mPa · s (Brookfield, dependente do fuso) |
| O Ph | 4,5-6,5 |
| Densidade | 1.05-10,10 g /cm³ a 25 ° C |
| Tamanho De Partícula | 0.1-10,0 micrômetros |
| Temperatura De Transição Vítrea | -10 ° C a 30 ° C dependendo do teor de monômero de acrilato |
| Temperatura Mínima De Formação De Filme | 0 ° C a 20 ° C |
| Flexibilidade Do Filme | Flexível e resistente com bom alongamento |
| Aparência Do Filme | Transparente ou translúcido na secagem |
| Adesão | Excelente aderência a madeira, papel, tecidos, espumas e muitos plásticos |
| Resistência à água | Bom a excelente, especialmente após coalescência ou reticulação |
| Estabilidade De Armazenamento | Estável por pelo menos 6 meses a 5 ° C a 40 ° C |
| Estabilidade Congelamento Descongelamento | Não congelável, a menos que especialmente formulado |
| Conteúdo De Voc | Baixo ou desprezível |
| Estabilidade Mecânica | Boa resistência ao cisalhamento durante a mistura e bombeamento |
Como uma fábrica acreditada de Emulsão de copolímero de acetato de vinilo-acrilato, aplicamos protocolos de qualidade rigorosos - cada lote é submetido a testes rigorosos para garantir padrões de eficácia e segurança consistentes.
| Embalagem | Embalado em tambores de aço revestidos de polietileno de 200 kg, selados e rotulados para transporte, armazenamento e manuseio seguros de emulsão de copolímero de acetato de vinila-acrilato. |
| Carga de contêiner (20' FCL) | A emulsão de copolímero de acetato de vinil-acrilato é carregada em FCL 20 'usando tambores ou flexitanks, fixados, com controle de temperatura para evitar o congelamento. |
| Envio | Embarque a emulsão de copolímero de acetato de vinil-acrilato como uma dispersão aquosa não perigosa em tambores, bolsas IBC ou flexitanks. Proteja do congelamento e do calor excessivo, idealmente armazenando entre 5 e 40 ° C. Certifique-se de que os recipientes estão selados, rotulados e protegidos para evitar vazamentos. Nenhuma classificação de mercadorias perigosas da ONU é normalmente necessária para formulações padrão. |
| Armazenamento | Armazene a emulsão de copolímero de acetato de vinil-acrilato em recipientes selados e rotulados em uma área fria, seca e bem ventilada. Mantenha as temperaturas entre 5 ° C e 30 ° C; evite congelamento, luz solar direta e fontes de calor. Mantenha os recipientes bem fechados para evitar esfola ou contaminação. Mexa suavemente antes de usar. Sob armazenamento adequado, a vida útil é tipicamente de 6 a 12 meses. |
| Prazo de validade | Prazo de validade normalmente 6-12 meses se armazenado selado, fresco e sem congelamento; mexa antes de usar. |
On high-speed case-sealing and paperboard lamination lines running above 120 m/min, vinyl acetate-acrylate copolymer emulsions with solids content of 50–55% and pH 4.5–5.5 are selected because the carboxylated acrylic comonomer improves adhesion to clay-coated kraft and recycled board while maintaining cold-water machine cleanup. Compliance for this segment follows FDA 21 CFR 175.105 for incidental food-contact adhesives, FDA 21 CFR 176.170 and 21 CFR 176.180 for paper and paperboard components contacting aqueous, fatty, and dry foods, and EU Framework Regulation 1935/2004 for food-contact materials; compounders are required to document residual vinyl acetate monomer below the specific migration limit referenced in Commission Regulation 10/2011 where the adhesive is used as a plastic layer in multi-material food packaging. In a typical case-sealing adhesive compound, the base emulsion is charged at 60–75 wet parts per 100, poly(vinyl alcohol) protective colloid at 3–6 dry parts, plasticizer at 0–3 wet parts, defoamer at 0.1–0.3 wet parts, and water to adjust the final Brookfield viscosity to 800–1,500 mPa·s at 25°C using spindle 4 at 20 rpm. The downstream converting process applies the adhesive through engraved roll or doctor-knife stations; transfer rolls with hardness 40–60 Shore A are standard for clay-coated substrates, and forced-air drying at 70–90°C for 2.5–5 s is followed by compression section dwell. Converted article classes include side-seam folding cartons, corrugated case sealing, paper tube winding, printed sheet lamination, and tray forming. Field observations on paper tube winding lines above 150 m/min show that pot viscosity drift greater than 500 mPa·s over an 8 h shift causes adhesive transfer skip and inconsistent seam burst resistance; therefore recirculation loops with low-shear progressive cavity pumps and temperature control below 35°C are used.
Formulation latitude for low-VOC interior wall paints is governed by the minimum film formation temperature of the vinyl acetate-acrylate copolymer and by the ability of the acrylic comonomer to reduce coalescent demand without sacrificing early block resistance. Paint compounds in this segment must comply with EU Directive 2004/42/EC Phase II VOC limit of 30 g/L for interior matt wall and ceiling coatings, and the cured film is tested according to ISO 11998 for wet-scrub resistance and DIN EN 13300 class 2 classification for scrub and burnish performance. The binder is typically added at 12–18 wt% binder solids on total formulation, with PVC maintained at 60–75% and coalescent usage at 2–5 wt% on binder solids; below 10 wt% binder solids, the wet-scrub classification characteristically falls below DIN EN 13300 class 2 because calcium carbonate-containing formulas show rapid pigment detachment. The downstream manufacturing process uses a high-speed disperser at 15–25 m/s tip speed for pigment dispersion, followed by low-shear letdown at 4–8 m/s; the emulsion is added after the grind and the vessel temperature is kept below 55°C to prevent coagulum formation on cooling coils. End products include interior wall paints, ceiling paints, and primer-sealer coatings for gypsum plasterboard and sand-cement plaster. In production-scale tinting systems, syneresis and viscosity drift above 10% of initial Stormer viscosity after 28 days at 40°C are monitored because the acrylic acid-containing copolymer interacts with associative HEUR thickeners and can produce a heat-age viscosity rise that alters spray and roller application.
Because basis weight fluctuations in airlaid nonwoven production alter binder distribution unevenly, vinyl acetate-acrylate copolymer emulsions are applied in foam or spray form to wipe and hygiene substrates with basis weights between 40 g/m² and 120 g/m². Regulatory compliance is based on REACH 1907/2006, Oeko-Tex Standard 100 Annex 4 for residual monomer and formaldehyde limits, and ISO 9073-3 for machine-direction and cross-direction tensile strength of the finished nonwoven. The binder is applied at a dry add-on of 8–25% by fiber weight; airlaid wipe grades generally use 10–15%, while high-wet-strength tablecover and hygiene acquisition layers use 18–25%. The downstream process applies the emulsion through a foam generator with a blow ratio of 1:5 to 1:15 or through low-pressure spray manifolds; the web then enters a through-air dryer at 120–140°C with dwell time of 20–60 s, followed by a cure section if a glyoxal or polyfunctional aziridine crosslinker is used. The critical production variable is the wet film coalescence window before drying; uneven foam collapse produces binder migration to the surface and a loss of z-direction strength. Finished nonwoven articles include disposable wipes, airlaid table covers, hygiene acquisition layers, absorbent pads, and pre-moistened wipe substrates. On commercial airlaid lines, the addition of more than 0.5 wt% surfactant based on binder solids can depress the wet tensile retention below 50% after water soak per ISO 9073-3, which confines surfactant use to foam stabilization and rewet control for nonwoven converting.
Wood lamination plants processing beech, oak, and poplar interior components use vinyl acetate-acrylate copolymer emulsions because the acrylic comonomer raises the glass transition temperature and accelerates tack development in cold-press operations without the pot-life limitations of two-component urea or PVAc-crosslinker systems. The governing conformity framework for wood laminating adhesives is DIN EN 204 and DIN EN 205; the target durability class is D2 for interior use with occasional short-term water exposure, while D3 is outside the intended range unless a separate crosslinker is added. The adhesive is formulated at 100 wet parts emulsion, 2–5 parts plasticizer, 0.5–1.5 parts associative thickener, and water to a final viscosity of 5,000–12,000 mPa·s at 25°C. Application is performed with a single-sided roll coater at a spread rate of 80–150 g/m², followed by assembly cold pressing at 0.5–1.2 N/mm² for 15–40 min and clamping for 24 h before machining. End-use components include edge-glued furniture panels, interior door stiles, window scantlings, and laminated veneer panels for interior joinery. The principal operational boundary is the minimum film formation temperature and the open time after roll transfer; open times beyond 15 min at 23°C and 50% RH produce dry line formation on oak substrates due to water absorption into the vessels, reducing shear strength below the DIN EN 205 requirement. Wood moisture content above 8% weakens the bond line and requires pre-drying before spread. Because the emulsion is anionic, addition of amine-based pH adjusters above pH 8 is avoided because the shift reduces colloidal stability of the acidic vinyl acetate-acrylate dispersion and may cause visible coagulum in the adhesive film.
In upholstery and drapery backcoating operations where woven polyester or cotton blends must be stabilized against seam slippage and distortion, vinyl acetate-acrylate copolymer emulsion is applied as a compounded backcoating paste with controlled dry add-on. Regulatory conformity for backcoating compounds references REACH 1907/2006, Oeko-Tex Standard 100 Annex 4 for residual monomer and formaldehyde limits after processing, ISO 13934-1 for tensile strength of woven textiles, and ISO 13936-1 for seam slippage resistance. The backcoating compound is formulated with 100 wet parts emulsion, 50–120 parts ground calcium carbonate or kaolin, 2–6 parts acrylic thickener, and water to a Brookfield viscosity of 4,000–9,000 mPa·s at 25°C. The downstream process applies the compound by knife-over-roll or rotary screen at a dry add-on of 10–25% on fabric weight, followed by forced-air drying at 130–150°C for 1–3 min and cooling before rolling. Converted textile articles include upholstery backings, drapery liners, mattress ticking, furniture skirting, and automotive seat backings for interior use. The operational boundary for this emulsion is the softened film after water immersion; without addition of a melamine-formaldehyde or isocyanate crosslinker, wet seam strength retention above 50% after 24 h water soak at 23°C is generally not achieved, so the material is excluded from exterior marine or outdoor furniture applications.
Open time under EN 1348 is not fixed when the polymer-cement ratio of a vinyl acetate-acrylate emulsion exceeds 0.10 in cementitious tile adhesives and repair mortars. Qualification testing is performed under EN 12004 for adhesive classification, EN 1348 for tensile adhesion strength of cementitious tile adhesives, and ISO 13007-1 for ceramic tile installation materials; the polymer dispersion must also meet the relevant REACH registration and, for indoor use, the emission criteria of the German AgBB scheme when applied in floor assemblies. The addition ratio is 5–15% polymer solids by cement weight, with the water-cement ratio maintained at 0.35–0.50; the preferred mixing method is a twin-shaft compulsory mixer at 150–300 rpm, with the emulsion added to the water before cement to avoid high-shear coagulation from the calcium ion load. The downstream process consists of mixing the dry cement-sand-filler blend for 60–120 s, adding the diluted emulsion, mixing for another 120–180 s, applying with a notched trowel, and testing the open time at 30 min per EN 1348. Final installation materials include C1 and C2 tile adhesives, flexible waterproofing slurries, tile grouts, and repair mortars for indoor and sheltered exterior applications. The operational boundary is heat-induced gelation above 40°C and freezing below 0°C; field batches stored in unheated silos have shown viscosity growth above 20% within 72 h when the emulsion was dosed directly into dry mix without pre-dilution, causing variable trowel rheology and reduced initial grab on porcelain. Batch-to-batch variation in polymer solids of ±1% is observable as a shift in the 30-min open time of 5–10 min under EN 1348 testing, which is why liquid emulsion storage is agitated before dosing.
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In waterborne adhesive and coating manufacture, vinyl acetate-acrylate copolymer emulsion is handled as a surfactant-stabilized aqueous dispersion of copolymer particles produced by semi-continuous emulsion polymerization. A representative commercial designation may specify 55±1 wt% solids, an anionic emulsifier system, and a nominal glass transition temperature of 5°C. The product is typically received at pH 4.5–5.5 and Brookfield viscosity 2,000–4,000 mPa·s at 25°C using spindle 3 at 30 rpm, with a particle-size distribution centered at 180–250 nm. Production-scale storage requires jacketed stainless steel tanks with slow turbine agitation at 10–20 rpm; batch-to-batch viscosity variation in 10,000 L reactors can be held within ±15% by controlling the delayed monomer feed profile and initiator dose. These emulsions differ from vinyl acetate homopolymers in that the acrylate comonomer introduces ester side chains that reduce hydrolytic lability and lower film formation temperature without the same degree of external plasticizer demand.
The copolymer occupies a performance window between PVAc homopolymer and vinyl acetate-ethylene copolymer dispersions. PVAc homopolymer typically exhibits a glass transition temperature near 30°C, requiring 8–15 wt% coalescent or plasticizer to form coherent films at 23°C; water resistance after 24 h immersion per ISO 62 often falls outside acceptable limits for damp-environment bonding. Vinyl acetate-acrylate copolymer can be polymerized to a glass transition temperature range of -10°C to +30°C by adjusting acrylate content, so a grade with a glass transition temperature of 5°C and MFFT 6–8°C may be used with reduced coalescent levels. Compared with vinyl acetate-ethylene dispersions, the acrylate-modified system often provides greater tensile strength and creep resistance at equivalent film softness, while retaining adequate alkali and ultraviolet exposure behavior for interior and semi-exterior applications. All-acrylic dispersions remain superior in exterior durability; QUV-B exposure per ASTM G154 for 1,000 h typically produces yellowing index change below 2 for all-acrylic films, whereas vinyl acetate-acrylate films may show yellowing index change of 4–8 under the same conditions. The vinyl acetate-acrylate product is selected where cost, adhesion to wood and paper, and regulatory compatibility under 21 CFR 175.105 are governing. Table 1 summarizes comparative data drawn from supplier technical bulletins.
| Property | Vinyl acetate-acrylate | PVAc homopolymer | VAE dispersion | Styrene-acrylic |
|---|---|---|---|---|
| Glass transition temperature | -10 to +30 °C | +28 to +33 °C | -10 to +15 °C | 0 to +60 °C |
| Minimum film formation temperature | 0 to 25 °C | 15 to 28 °C without coalescent | <0 to 10 °C | 10 to 60 °C |
| Water uptake, 24 h, ISO 62 | 8–25 wt% | 30–60 wt% | 20–40 wt% | 5–15 wt% |
| T-peel adhesion to beech veneer, ASTM D903 | 6–12 N/25 mm | 4–9 N/25 mm | 3–8 N/25 mm | 2–6 N/25 mm |
Mechanistically, film formation proceeds through evaporation-induced particle packing, particle deformation, and interfacial interdiffusion. The minimum film formation temperature, measured by ISO 2115, places a processing lower bound: grades with MFFT 8°C can be coated at 15°C substrate temperature without coalescent, whereas a grade with MFFT 18°C requires 3–5 wt% 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate to suppress MFFT below 5°C. In a continuous hot-air tunnel with zone temperatures set at 60°C, 80°C, and 110°C, film defects such as mud-cracking and intercoat blistering appear when the wet film thickness exceeds 300 μm and the first-zone relative humidity remains above 70%. The lower water uptake relative to PVAc is attributed to hydrophobic acrylate ester segments; cast films of 1 mm thickness immersed in deionized water at 23°C for 24 h according to ISO 62 typically absorb 10–18 wt% water, compared with 30–60 wt% for PVAc homopolymer films of equal thickness.
Incoming quality control for vinyl acetate-acrylate copolymer emulsion normally includes solids content, pH, residual monomer, sieve coagulum, and Brookfield viscosity. Solids content is determined by ISO 3251 with a 1 g sample dried at 105°C for 3 h; the acceptance range is often 50–60 wt%, depending on product code and intended application. pH is measured with a calibrated electrode per ISO 976, and the accepted range of 4.0–6.5 reflects anionic stabilization; excursions above 7.5 are associated with microbial growth and particle destabilization. Residual vinyl acetate monomer below 0.1 wt% by gas chromatography with headspace injection is typical for low-odor interior grades. Coagulum retained on a 100 μm sieve after dilution to 10 wt% solids should remain below 0.05 wt% to prevent screen blocking in roller coating and gun spitting in spray application. Table 2 lists representative specification parameters and corresponding test methodologies.
| Parameter | Typical range | Test method |
|---|---|---|
| Solids content | 50–60 wt% | ISO 3251 |
| pH | 4.0–6.5 | ISO 976 |
| Brookfield viscosity at 25 °C | 1,000–6,000 mPa·s | ISO 2555, LV spindle 3, 30 rpm |
| Minimum film formation temperature | 0–20 °C | ISO 2115 |
| Particle size, z-average | 120–350 nm | ISO 22412 |
| Sieve coagulum on 100 μm | <0.05 wt% | Dilution to 10 wt%, internal method |
| Acid number on dry polymer | 2–15 mg KOH/g | ISO 3682 |
| Residual vinyl acetate monomer | <0.1 wt% | Headspace gas chromatography, internal method |
During pressure-sensitive adhesive manufacture, the emulsion is compounded with tackifier dispersions, plasticizers, wetting agents, and rheology modifiers in a high-shear dispersion mixer. A production-scale rotor-stator mixer operating at tip speed 18–22 m/s can generate a localized temperature rise to 45°C within 15 min; shear-induced coagulation then appears as filter plugging on 60–80 μm bag filters. In mechanical stability tests modeled after ISO 2006, emulsion viscosity should not increase by more than 20% after 5 min under high shear; otherwise, batch transfer through piston pumps and knife-over-roll coating heads produces phase-separation streaks. Processing temperatures above 50°C accelerate hydrolysis of vinyl acetate repeat units, lowering pH to 3.5 and increasing viscosity through acid-induced thickening; anionic grades should therefore be buffered with sodium acetate or ammonia to maintain pH 4.8–5.5 during long mixing campaigns. Multivalent salts such as zinc acetate or calcium chloride should be avoided at concentrations exceeding 0.1 wt% because ionic crosslinking of carboxylated latex particles raises gel content and destroys nozzle atomization.
Acrylic acid or methacrylic acid content in the copolymer typically ranges from 0.5–3.0 wt% of total monomer, yielding an acid number of 2–15 mg KOH/g dry polymer. Carboxyl groups localized on particle surfaces increase adhesion to aluminum, galvanized steel, and cellulose fiber; peel strength in laminating applications may rise from 2.5 N/20 mm to 6.0 N/20 mm when acid number increases from 3 mg KOH/g to 12 mg KOH/g, provided the substrate surface energy exceeds 40 mN/m. These acid groups permit post-crosslinking with zinc oxide, ammonium zirconium carbonate, or epoxy-functional silanes; addition of 0.5–1.5 wt% ammonium zirconium carbonate increases solvent resistance as evaluated by double rubs with methyl ethyl ketone from 8 to 35. Excessive carboxyl content reduces water resistance and raises viscosity through alkali-swellable thickening at pH above 7.0 because particle swelling contributes more viscosity than true associative thickening.
Where glass transition temperature and coalescing-solvent demand are constrained by indoor air quality requirements, vinyl acetate-acrylate copolymer emulsions are frequently selected for architectural wall primers and nonwoven binder saturation. For wall primers with pigment volume concentration near 35%, the product is formulated with associative polyurethane thickeners to achieve Stormer viscosity 90–100 KU per ASTM D562; substrates coated at 120–150 g/m² dry film weight meet burnish resistance and contrast ratio targets without excessive coalescent. In nonwoven saturation lines, a formulation with wet pick-up of 80–120% based on dry web weight is applied by pad-nip equipment, then cured at 150°C for 3 min. Crosslinking with melamine-formaldehyde or citric acid at 0.5–1.0 wt% on dry binder improves wet tensile strength retention after 1 h water immersion per ISO 9073-3, but may reduce softness of the finished web. The product is not recommended for long-term exterior topcoats where all-acrylic binders are specified, nor for immersion-grade coatings in continuous water contact without additional crosslinking and adhesion promoters; published data for some specific nonwoven and primer configurations is limited and must be confirmed by line trials.
