| HS Kodu | 577350 |
| Dış Görünüş | Beyaz granül toz |
| Hidroliz Derecesi | 88 ± 1 mol% |
| Ortalama Polimerizasyon Derecesi | 1000 ± 100 |
| Viskozite | 8-12 mPa·s (% 4 sulu çözüm, 20 ° C) |
| Ph | 5-7 |
| Uçucu Içerik | ≤ %5 |
| Kül Içeriği | ≤ %0,5 |
| Beyazlık | ≥ %90 |
| Parçacık Boyutu | 20-40 örgü |
| Çözünürlük | Suda çözünür |
Akrediteli bir Sinopec PVA 088-08 (PVA 1088) fabrikası olarak, katı kalite protokolleri uyguluyoruz - her seri tutarlı etkinlik ve güvenlik standartlarını sağlamak için titiz testlerden geçiyor.
| Paketleme | Sinopec PVA 088-08, güvenli taşıma için paletleştirilmiş ve shrink-wrapped, iç plastik astarlı 25 kg çok katmanlı kağıt torbalarda paketlenmiştir. |
| Konteyner Yükleme (20' FCL) | 20 'FCL: paketli PVA 088-08 paletlere yüklenmiş, konteynerli güvenli, kuru, havalandırılmış; Kargo başına yaklaşık 20 ton. |
| Nakliye | Sinopec PVA 088-08, nem geçirmez mühürlü torbalarda ince beyaz bir toz olarak, paletli ve küçültülmüş sarılır. Kuru tutun, aşırı toz üretiminden kaçının ve serin, havalandırılmış bir alanda saklayın. Normal kullanım altında tehlikeli olmayan; kaliteyi korumak için nem ve kirlilikten korumak. |
| Depolama | Sinopec PVA 088-08'i doğrudan güneş ışığı, ısı ve ateşme kaynaklarından uzak serin, kuru, iyi havalandırılmış bir alanda saklayın. Ne emilmesini önlemek için konteyneri sıkıca mühürleyin, çünkü ürün higroskopik. Toz birikiminden kaçının ve ortam sıcaklığında, ideal olarak 30 ° C'nin altında, orijinal ambalajda saklayın. |
| Raf ömrü | Kapalı bir konteynerde, soğuk ve kuru saklayın. Tipik raf ömrü üretim tarihinden itibaren iki yıldır. |
| PVA 088-08 (wt% on dry powder) | Slurry viscosity at 25°C (mPa·s, Brookfield RV, #4 spindle) | Green flexural strength (MPa, ASTM C1161) | Debinding cycle time (hours, to 500°C at 0.3°C/min) |
|---|---|---|---|
| 1.5 | 820 | 1.2 | 18 |
| 2.5 | 1450 | 3.1 | 22 |
| 4.0 | 2680 | 4.8 | 30 |
| 5.5 | 4100 | 6.0 | 38 |
Bütçenize uygun rekabetçi Sinopec PVA 088-08 (PVA 1088) fiyatları - her sipariş için esnek şartlar ve özelleştirilmiş teklifler.
Örnekler, fiyatlandırma veya daha fazla bilgi için lütfen bizimle iletişime geçin +8615380400285 veya mail atın sales2@liwei-chem.com.
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Within the portfolio of partially hydrolysed polyvinyl alcohols produced by Sinopec, the designation 088-08—routinely referenced in downstream sectors as PVA 1088—identifies a medium‑viscosity grade engineered to satisfy a narrow window of aqueous solubility, interfacial activity, and film‑forming mechanics. The numerical suffix carries structural meaning: the first two digits communicate a nominal degree of polymerisation near 800 (corresponding to a weight‑average molecular weight in the range 35 000–45 000), while the final pair indicates a degree of hydrolysis of 87.0–89.0 mol%. Residual acetate groups are therefore retained at 11–13 mol%, a distribution that suppresses crystalline order sufficiently to permit dissolution in cold water yet preserves enough inter‑chain hydrogen bonding to build pragmatic tensile strength in cast films. The product is manufactured via continuous belt saponification of polyvinyl acetate followed by methanol recovery and low‑temperature drying under controlled relative humidity—a sequence that limits thermal history and maintains the light‑cream granular morphology expected by compounders operating loss‑in‑weight feeders on twin‑screw extrusion lines.
Industrial qualification of a PVA 088-08 lot typically proceeds against the parameters codified in the GB/T 12010 series or the functionally equivalent ISO 15023-2:2019 framework. The following condensed table reproduces the release limits that converters reference when qualifying incoming shipments for adhesive compounding, textile size‑cooking, or emulsion‑polymerisation duties. All methods assume a 4 wt% aqueous solution equilibrated at 20 °C unless otherwise noted.
| Property | Nominal range | Reference method |
|---|---|---|
| Viscosity (4 % aq., 20 °C) | 26.0–34.0 mPa·s | GB/T 12010.3‑2010 (Brookfield LV, spindle 1, 30 rpm) /ISO 3105 |
| Degree of hydrolysis | 87.0–89.0 mol% | GB/T 12010.2‑2010 (saponification‑alkali titration) |
| Volatile matter | ≤ 5.0 wt% | GB/T 12010.4‑2010 (105 °C, 3 h) |
| Ash content | ≤ 0.7 wt% | GB/T 12010.7‑2010 (750 °C, 2 h) |
| pH (4 % aq.) | 5.0–7.0 | GB/T 12010.8‑2010 |
| Transmittance (4 % aq., 550 nm) | ≥ 85 % | GB/T 12010.5‑2010 |
Coagulum retention on a 75 µm sieve during preparation of the stock solution is routinely specified below 0.02 wt% by converters engaged in high‑shear dispersion for pressure‑sensitive adhesives, as undissolved gels nucleate fisheye defects in thin‑film coating. Storage trials conducted in unlined multi‑wall paper sacks at 25 °C and 50 % relative humidity show viscosity drift of less than 2 % over twelve months, provided the material is not exposed to intermittent condensation cycles that trigger particle bridging in the hopper throat of a gravimetric feeder.
In batch and semi‑continuous vinyl acetate emulsion polymerisations—those targeting polyvinyl acetate homopolymer or vinyl acetate‑ethylene copolymer dispersions with solids fractions exceeding 55 wt%—PVA 088-08 functions as both protective colloid and grafting backbone. The 87–89 mol% hydrolysis window places the surfactant‑like character of the polymer in a transition zone: the residual acetyl groups provide sufficient hydrophobic anchoring at the monomer‑polymer particle interface to suppress coalescence during the exothermic propagation stage, while the pendant hydroxyl sequences maintain steric stabilisation in the aqueous serum. Plant‑scale reactors equipped with pitched‑blade turbine agitators and jacket cooling loops capable of removing 400–600 W·L⁻¹ of heat record a 15–25 % reduction in coagulum formation when the post‑addition feed rate of the PVA solution is profiled to match the instantaneous radical flux, compared with a single‑shot protective‑colloid charge. This effect is magnified when the target particle‑size distribution lies between 0.8 µm and 2.5 µm, as measured by laser diffraction on a Malvern Mastersizer after removal of coarse agglomerates through a 180 µm in‑line strainer.
What distinguishes 088-08 from a fully hydrolysed grade such as 1799 (degree of hydrolysis ≥ 99.0 mol%) in this application is not merely cold‑water solubility, but the kinetic competency of the residual acetate sites to participate in chain‑transfer‑to‑polymer events. The acetate methine proton is sufficiently labile under radical attack to generate polyvinyl alcohol backbone radicals that subsequently initiate vinyl acetate grafting. At a polymerisation temperature of 70 °C and a potassium persulfate concentration of 0.25 phm, the graft ratio—defined as mass of polyvinyl acetate chemically bonded to PVA relative to initial PVA mass—reaches 0.30–0.45 for 088-08, whereas a fully hydrolysed analogue under identical conditions yields a graft ratio below 0.10. This grafted layer contributes to particle‑size monodispersity and to the tensile‑shear performance of the dried film when the dispersion is formulated into wood adhesives that must comply with EN 204/D3 durability classification.
In high‑pressure polymerisation loops operating above 80 bar—common for vinyl acetate‑ethylene latexes—the partial hydrolysis product maintains Newtonian flow at shear rates up to 1000 s⁻¹ in the aqueous phase, whereas a higher‑viscosity partially hydrolysed grade such as 088-20 (nominal viscosity 40.0–50.0 mPa·s) transitions to shear‑thinning behaviour and reduces heat‑transfer coefficients across the tube side of the heat exchanger by 8–12 %. This rheological divergence frequently dictates the selection of 088-08 for thin‑film evaporator pre‑concentration steps where wall shear stress must remain above 5 Pa to prevent fouling.
When the polymer is dissolved in deionised water at 90 °C and subsequently cooled to ambient temperature, the resulting solution exhibits a cloud point that is absent in grades with hydrolysis above 95 mol%. The 4 % solution remains translucent at 20 °C but develops a reversible haze below 12 °C, a characteristic exploited in thermoreversible gelcasting of ceramic green bodies where controlled syneresis is required to achieve a green density of 2.1 g·cm⁻³ in alumina tape before debinding. Tensile bars drawn from solution‑cast films conditioned at 23 °C and 50 % RH according to ASTM D882‑18 deliver an ultimate tensile strength of 38–48 MPa and elongation at break of 180–250 %; these values shift to 22–28 MPa and 300–380 % when the film is plasticised with 10 wt% glycerol, a formulation frequently specified for water‑soluble laundry bags tested under ISO 14001‑compliant hospital infection‑control protocols. Crucially, the presence of free carboxylate species in alkaline cleaning formulations (pH > 10) catalyses subtle deacetylation at the film surface over a 72‑hour immersion period, causing a gradual increase in surface energy from 38 mN·m⁻¹ to 46 mN·m⁻¹ as measured by contact angle goniometry with diiodomethane and water on a Krüss DSA100. This drift must be accounted for when the film functions as a mould‑release liner for epoxy prepregs, where a stable low‑energy surface is required to achieve peel forces below 0.5 N·cm⁻¹.
The shift from solution‑cast clarity to opaque, pigmented films in paper‑coating applications demands a supplementary rheological modifier. Where the cobinder in a blade‑coating colour containing 60 wt% calcium carbonate (particle size D₅₀ ≈ 2.0 µm) is composed entirely of PVA 088-08, the high‑shear apparent viscosity at 10⁵ s⁻¹—relevant to the blade metering zone—falls to 12–18 mPa·s, which is insufficient to prevent streaking on a cylinder‑blade coater running at 1200 m·min⁻¹. Process adjustments trialled on a Voith SpeedSizer at a containerboard mill demonstrated that partial substitution with 10 wt% of a higher‑molecular‑weight grade (The equilibrium moisture content of PVA 088-08 stored at 25 °C and 65 % RH is approximately 4.0 wt%, and while this level does not inhibit screw feeding in a single‑screw extruder with a grooved barrel, it promotes bubble nucleation during hot‑melt compounding with ethylene‑vinyl alcohol copolymer when the melt temperature exceeds 190 °C. Fourier‑transform infrared spectroscopy of films extruded from material that was not vacuum‑dried at 80 °C for 4 hours reveals absorbance peaks at 1705 cm⁻¹ attributable to carbonyl by‑products of acetic acid elimination, indicating thermal degradation that reduces the interlayer adhesion strength in multi‑layer barrier packaging below the 3.0 N·15 mm⁻¹ threshold mandated by GB/T 8808. Consequently, compounders operating co‑rotating twin‑screw extruders with an L/D ratio of 44:1 install a vacuum vent port at barrel zone 8 and maintain a pressure of –0.08 MPa to strip residual moisture downstream of the melting section.
When PVA 088-08 is dry‑blended with polyvinylpyrrolidone K‑30 to formulate a water‑soluble pharmaceutical film coating, the glass‑transition temperature of the mixture follows the Fox equation with experimentally derived Tg values of 58 °C for the PVA component and 165 °C for PVP. The blend miscibility window spans a PVA mass fraction from 0.25 to 0.75 as confirmed by a single tan δ peak in dynamic mechanical analysis at 1 Hz; outside this range, phase separation generates a second damping peak and compromises the oxygen‑barrier performance—measured as an increase in oxygen transmission rate from 0.8 cm³·m⁻²·day⁻¹·atm⁻¹ to above 3.2 cm³·m⁻²·day⁻¹·atm⁻¹ at 23 °C and 50 % RH (ASTM D3985‑17). Formulators bridging PVA with glyoxal‑based crosslinkers for tissue‑paper wet strength must observe that the 11–13 mol% acetate content retards acetal formation kinetics; the wet‑strength development plateau shifts from 15 minutes to 45 minutes at 120 °C compared with a fully hydrolysed grade, a delay that influences the layout of the after‑dryer section on a crescent‑former tissue machine.
The selection of 088-08 over alternatives reduces to a balance among solvation speed, rheological predictability, and the desired surface‑active contribution. The table below collates critical decision‑driving properties for three archetypal polyvinyl alcohols encountered in the same formulating environment.
| Indicator | PVA 088-08 (1088) | PVA 1799 (fully hydrolysed) | PVA 088-20 (higher viscosity) |
|---|---|---|---|
| Solution preparation time at 90 °C (4 % conc.) | 30–40 min | 60–90 min | 50–70 min |
| Apparent viscosity at 20 °C, 4 % (mPa·s) | 28–32 | 25–30 | 42–48 |
| Film tensile strength (ASTM D882, 23 °C, 50 % RH) | 43 MPa (±5 MPa) | 65 MPa (±7 MPa) | 45 MPa (±4 MPa) |
| Interfacial tension vs. vinyl acetate monomer (mN·m⁻¹) | 12 | 28 | 11 |
| Critical overlap concentration c* (g·dL⁻¹) | 0.38 | 0.42 | 0.22 |
| Wet adhesion to cellulose (EN 204, D3 cycle, N·mm⁻²) | 2.8 | 3.5 | 3.0 |
The pronounced reduction in interfacial tension against vinyl acetate monomer—from 28 mN·m⁻¹ for a fully hydrolysed backbone to 12 mN·m⁻¹ for 088-08—is the primary driver for the superior colloidal stability witnessed in high‑solids emulsion polymerisation. Conversely, in alkaline paper‑sizing circuits where borax or sodium metaborate is used to induce instantaneous gelation through didiol complexation, the gel modulus obtained with 088-08 at a borax loading of 0.5 wt% on PVA is 1.2 kPa, substantially lower than the 3.8 kPa achieved by 1799 under the same conditions (oscillatory time sweep at 1 Hz, parallel‑plate geometry). This deficiency bars 088-08 from being the sole rheology modifier in curtain‑coating recipes requiring a yield stress above 5 Pa to stabilise the fluid film against gravitational drainage. Nevertheless, in textile warp sizing for polyester‑cotton blends processed on high‑speed air‑jet looms operating at 850 picks·min⁻¹, the medium viscosity and rapid film‑formation of 088-08 yield a size add‑on of 10–14 % with a shedding rate of 0.8 mg·kg⁻¹ of yarn, metrics that are difficult to replicate with the slower‑dissolving high‑viscosity 088-20 without increasing the size‑box temperature to 95 °C and risking thermal degradation of the starch‑PVA blend.
