| HS Code | 480202 |
| Product Name | Sinopec PVA 100-35 |
| Brand | Sinopec |
| Grade | 100-35 |
| Cas Number | 9002-89-5 |
| Chemical Formula | (C2H4O)n |
| Appearance | white powder or granules |
| Degree Of Hydrolysis | 99.0-100.0 mol% (fully hydrolyzed) |
| Viscosity 4 Aqueous Solution 20c | 35.0-45.0 mPa·s |
| Ph 4 Aqueous Solution | 5-7 |
| Volatile Content | ≤5.0% |
| Ash Content | ≤0.5% |
| Density | 1.27-1.31 g/cm3 |
| Solubility | soluble in hot water; insoluble in most organic solvents |
| Melting Point | 180-240°C (with decomposition) |
As an accredited Sinopec PVA 100-35 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Sinopec PVA 100-35 is packaged in 25 kg multi-wall paper bags with inner polythene liner, palletized and shrink-wrapped. |
| Container Loading (20′ FCL) | Sinopec PVA 100-35 packed on pallets and securely loaded into a 20-foot FCL container for safe transport. |
| Shipping | Sinopec PVA 100-35 is shipped as a white granular powder in sealed multi-layer paper or woven bags, palletized and wrapped for protection. Keep dry and ventilated, avoiding moisture, rain, and direct sunlight. It is not classified as dangerous goods for sea, air, or road transport. Handle with care to prevent dust. |
| Storage | Store Sinopec PVA 100-35 in a cool, dry, well-ventilated area, away from heat, open flames, and direct sunlight. Keep containers tightly sealed to prevent moisture absorption and contamination. Avoid creating dust clouds; ground and bond containers during handling. Separate from oxidizing agents and strong acids. Maintain moderate temperatures and protect from physical damage. |
| Shelf Life | Shelf life is typically 12 months when stored in a cool, dry place with proper packaging. |
Surface application of oxidized starch blended with fully hydrolyzed PVA 100-35 at a dry-weight ratio between 80:20 and 50:50 demonstrably raises IGT pick velocity and suppresses binder migration in lightweight coated board. The sizing solution is prepared by cooking PVA 100-35 separately at 12–15% solids and 95°C for 40 minutes, then blending with starch cooked at 18–22% solids to achieve a final bath concentration of 8–14%. Application is performed with a film transfer metering size press (Voith SpeedSizer or equivalent) running at 800–1,200 m/min, with the bath held at 60–65°C to limit viscosity drift. When PVA 100-35 constitutes 30% of the binder, sheet IGT pick velocity measured per TAPPI T 459 om-03 improves by 18–25% over straight starch on bleached kraft liner, without the misting and roll contamination encountered with low-viscosity surface sizes. The fully hydrolyzed structure provides a high barrier to oil and grease penetration: Cobb 1,800 s oil absorption (TAPPI T 559) drops below 0.8 g/m² with a 2.5 g/m² PVA-starch coat weight, qualifying the substrate for direct food contact under FDA 21 CFR §176.170 components and BfR Recommendation XXXVI. Retention aids such as polyamine-epichlorohydrin resin at 0.05–0.10% on fiber may be required to fix any PVA filtrate in white water circuits, preventing deposit accumulations on press felts. The critical operational boundary is re-wetting: once dried, the PVA film resists re-dissolution during offset lithography blanket washes, yet excessive oven temperatures above 140°C cause intra-ply blistering during calendering due to rapid vapor ingress into the still-hygroscopic size layer. Terminal product: high-holdout folding boxboard and solid bleached sulfate board with printable surface integrity.
In the semi-batch emulsion polymerization of vinyl acetate under reflux at 72–75°C, the choice of protective colloid governs not only latex viscosity stability but also the degree of grafting onto the PVA backbone. Sinopec PVA 100-35 is pre-dissolved in deionized water at 12–15% solids in a jacketed vessel with a bottom-entry high-shear disperser (1,500 rpm) to guarantee a speck-free liquor before feeding into the reactor. A typical initial charge contains 3–5 parts of PVA 100-35 per 100 parts vinyl acetate monomer, with the balance of the aqueous phase adjusted to deliver 40–55% total solids in the finished latex. Initiation uses 0.15–0.30% ammonium persulfate on monomer weight, fed continuously over 4–5 hours together with a delayed monomer stream to hold the exotherm within a ±2°C band. Excessive grafting triggered by temperature excursions beyond 78°C produces a sharp viscosity increase and coarse particle size distribution (Dv90 exceeding 5 μm), which clogs 100-mesh discharge filters. The polymerization reactor must be equipped with a variable-speed anchor stirrer and an automated initiator dosing pump to maintain a steady shear profile. Post-reaction stripping of residual monomer below 0.1% with steam at 80°C is mandatory, followed by the addition of a secondary colloid—often methocel or hydroxyethyl cellulose—to fine-tune high-shear Brookfield viscosity (ISO 2555, spindle #4 at 20 rpm) to 15,000–45,000 mPa·s. The latex exhibits minimum film formation temperature below 5°C and, after ammonia neutralization to pH 5.0–6.0, complies with US EPA 40 CFR Part 63 subpart HHHHH for hazardous air pollutant content. Admixture with cationic copolymer dispersions is strictly prohibited: the negative charge on the fully hydrolyzed PVA shell provokes instant coagulation upon contact with quaternary ammonium-containing emulsions. End-use fields encompass D3 and D4 wood adhesives meeting EN 204:2023 durability classes, paper-to-paper packaging adhesives, and non-structural assembly glues in which freeze-thaw stability is required down to –5°C through the addition of 3–5% ethylene glycol.Polyvinyl butyral resin destined for laminated safety glass interlayers relies on a narrow acetalization window when Sinopec PVA 100-35 serves as the feedstock. The fully hydrolyzed grade is pre-dried in a fluidized-bed dryer to a residual moisture level below 0.5% (determined by ISO 3251:2019 at 105°C), because excess water in the polymer shifts the equilibrium away from the cyclic acetal towards free aldehyde and precipitates uncontrolled gelation during the condensation step. A 10–13% aqueous solution of PVA 100-35 is charged into a glass-lined reactor, cooled to 15–18°C, and acidified with 37% hydrochloric acid to a pH of 1.0–1.3. n-Butyraldehyde is metered in at a molar ratio of 0.55–0.70 relative to hydroxyl groups, keeping the reaction mass below 25°C during the induction period; once turbidity develops, the temperature is allowed to rise to 32–35°C and held for 2.5–3.0 hours until the target acetalization degree—determined by residual acetyl value titration per JIS K6729—falls within 76–82%. A ratio exceeding 0.85 yields a hard, granular resin that fails to plasticize uniformly with triethylene glycol di-2-ethylhexanoate (38–42 phr), leading to optical haze above 2.0% (ASTM D1003, 2 mm film after 150°C press). The precipitated resin is subjected to intensive wash cycles with deionized water until the conductivity of the final waste wash drops below 20 μS/cm; chloride residuals as low as 50 ppm catalyse yellowing during autoclave lamination at 140°C and 1.2 MPa. A plate-and-frame filter press operating at 0.6 MPa dewaters the slurry, and vacuum tray drying at 35–40°C for 16–20 hours preserves the porous morphology essential for rapid plasticizer absorption in the twin-screw compounding stage. The finished PVB film, extruded through a 30:1 L/D co-rotating twin-screw at 190–210°C and cast onto a chill roll at 20°C, must exhibit a pummel adhesion value (EN 356) of 3–5 units on float glass and maintain ≥90% transmittance in the 400–800 nm range per ECE R43 for automotive windshields. Pre-drying of the PVA 100-35 becomes non-negotiable when ambient relative humidity exceeds 60%, as moisture absorption above 3% before dissolution triggers agglomerates that resist complete hydrolysis-inhibition during acetal addition and create “fish-eye” defects in the final extrudate.
Fully hydrolyzed PVA 100-35 with its high degree of polymerization constitutes the preferred raw material for gel-spun or wet-spun polyvinyl alcohol filament having a tenacity above 10 cN/dtex. Preparation of the dope involves dissolving the resin in deionized water at 95–98°C to a concentration of 16–20% by weight, followed by deaeration under vacuum at –0.09 MPa for 6–8 hours to remove microbubbles that cause filament breaks during the coagulation phase. The spinning solution is extruded through a spinneret with 0.08–0.12 mm capillary diameter into an aqueous sodium sulfate coagulation bath maintained at 420–440 g/L and 43–47°C. Bath concentration must remain within a ±5 g/L tolerance band: lower sulfate levels produce an inadequately oriented gel fiber with a crenulated cross-section, while higher levels trap sulfate crystals on the tow surface that defibrillate during subsequent drawing. The coagulated tow is drawn 4–6× in a first hot-water bath at 85°C, then drawn a further 1.5–2.0× in a dry chamber at 220–230°C to attain a total draw ratio of 8–12:1. Post-drawing, the filament is heat-set under tension at 235°C for 60–90 seconds and acetalized in-line with formaldehyde and sulfuric acid at 70°C to lock the oriented structure and confer a hot-water softening point above 120°C, as required by ASTM D882 testing at elevated temperature. Iron content in the coagulation bath must be held below 2 ppm, because ferric ions form colored complexes with the polyvinyl alcohol chain that cause irreversible yellowing during acetalization. The stretched filaments, cut into 38–65 mm staple or wound as 1,200-denier continuous tow, are targeted at high-tenacity industrial fabrics covering truck tarpaulins, conveyor belts, and geotextile reinforcement meshes, where the dry- broke strength measured per ISO 13934-1:2013 must exceed 3.5 kN/m at 12% strain. Mill experience confirms that a 0.5°C drift in dope temperature within the spin pack can shift filament denier by ±0.3, requiring closed-loop thermal regulation of the polymer manifold.
Dry-blended powdered cementitious tile adhesives (C2 class, EN 12004:2007+A1:2012) benefit from the addition of 0.5–1.5% Sinopec PVA 100-35 by weight of cement as a highly hydrolyzed rheology modifier that extends skinning time while retaining sag resistance on vertical substrates. The resin, milled to a particle size below 200 μm, is pre-dry-blended with Portland cement, quartz sand (0.1–0.5 mm), and cellulose ether (0.05–0.25%) to form a one-component powder. Upon mixing with 24–28% water, the PVA 100-35 dissolves gradually during the pot life and synergistically thickens the mortar, delivering a Brookfield viscosity (spindle 07 at 20 rpm) of 80,000–180,000 mPa·s without leading to lump formation common with fast-hydrating co-binders. Open time assessed per EN 1346:2007 increases by 15–25 minutes versus an unmodified reference, with ≥0.8 N/mm² adhesion strength after 28 days water immersion. The fully hydrolyzed structure of PVA 100-35 resists alkaline hydrolysis better than partially hydrolyzed grades, yet its compatibility with polycarboxylate ether superplasticizers is limited: a minor dosage above 0.20% on cement can trigger a rapid gelation and slump loss, so pre-testing by mini-slump cone (ASTM C143/C143M-20) is mandatory when adjusting superplasticizer levels. Extended exposure to pH 12.8 pore solution at 40°C for 28 days causes no significant drop in molecular weight, as confirmed by GPC analysis, ensuring the long-term cohesive strength of the bond coat. Terminal product: 25-kg bagged trowel-applied tile adhesive for porcelain and natural stone tiles on interior and exterior walls.
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Sinopec PVA 100-35 is a fully hydrolyzed polyvinyl alcohol resin with a nominal 4 % aqueous solution viscosity of 35.0 ± 4.0 mPa·s at 20 °C (Brookfield LV, spindle 1, 60 rpm) and a degree of hydrolysis of 98.0–99.0 mol%. The bulk powder exhibits a volatile content ≤ 5.0 % (ASTM D1348, 3 h at 105 °C), ash residue ≤ 0.5 % (ISO 3451-1), and a pH of a 4 % solution in the range 5.0–7.0 (GB/T 12010.4). This grade belongs to the 100-series, in which the numeric suffix denotes the target viscosity, and the prefix indicates a degree of polymerization near 1000. The immediate family includes Sinopec PVA 100-27 (viscosity 27.0 ± 3.0 mPa·s) and PVA 100-50 (viscosity 50.0 ± 5.0 mPa·s). Where 100-27 provides lower add‑on weight and faster size-box circulation in saturator‑type slashers, 100-35 delivers a balance of film toughness, moisture resistance, and processable solution viscosity. 100-50 generates stronger films but demands higher cooking temperatures and longer dissolution times; its use in fully automated size kitchens can introduce a productivity penalty when cycle times fall below 45 min.
| Property | PVA 100-27 | PVA 100-35 | PVA 100-50 | Test method |
|---|---|---|---|---|
| 4 % solution viscosity @ 20 °C (mPa·s) | 27.0 ± 3.0 | 35.0 ± 4.0 | 50.0 ± 5.0 | Brookfield LV |
| Degree of hydrolysis (mol%) | 98.0–99.0 | 98.0–99.0 | 98.0–99.0 | GB/T 12010.2 |
| Volatile content (%) | ≤5.0 | ≤5.0 | ≤5.0 | ASTM D1348 |
| Ash (%) | ≤0.5 | ≤0.5 | ≤0.5 | ISO 3451-1 |
| Film tensile strength (MPa)¹ | 44–48 | 48–53 | 53–58 | ASTM D882 |
| Typical cook time to full solubilisation @ 95 °C (min) | 30–40 | 40–55 | 55–75 | Internal agitated vessel |
¹ Films cast from 10 % aqueous solution, dried at 50 °C and conditioned at 23 °C/50 % RH for 48 h.
On fine paper machines operating above 1200 m/min, the metering size press applies a 6–10 % solids PVA solution to the sheet surface via rod or blade metering. Sinopec PVA 100-35 yields a size-press pickup of 1.8–2.4 g/m² per side when run at 60–65 °C to delay skinning on the metering element. Under these conditions, the film-forming grade retards Bristow wheel absorption time by 40–55 % versus unsized base (Cobb60 reduced from ≥200 g/m² to 22–28 g/m², TAPPI T441). Surface strength, measured by IGT pick velocity (ISO 3783), rises from 1.2–1.5 m/s on unsized substrate to 3.0–3.6 m/s. Lower-viscosity PVA 100-27 can be applied at 12 % solids without rod bounce, yet the thinner film-forming layer gives inferior dusting resistance on uncoated woodfree grades. PVA 100-50 requires dilution to 6 % or below to maintain blade-stable viscosity, which limits the dry pick‑up achievable in a single pass. An operational boundary worth noting: size-press starch co‑blends exceeding 30 % oxidized starch by dry weight can phase-separate during recirculation when the PVA 100-35 solution temperature drops below 50 °C, manifesting as surface grain on the reel.
Where operators encounter rod marks at widths above 3.6 m, experience points to shear-thinning behavior at the metering nip. Substitution of 100-35 with 100-27 often resolves the defect but sacrifices blocking resistance in subsequent sheeting operations; a blend of 70:30 100-35:100-27 has been documented to eliminate rod marks while retaining Cobb values below 30 g/m². Published data for this specific configuration is limited, but mill trials on a Voith SpeedSizer AT at 1400 m/min recorded defect-free runs exceeding 8 h.
Passing ring-spun cotton warp yarns through a slasher size box charged with PVA 100-35 at 8.5 % solids confers a size add‑on of 8–10 % owf. The cohesive film deposited on the yarn surface withstands repeated cyclic abrasion against drop wires and heddle eyes during high-speed air-jet weaving (loom speed 850–1050 rpm). Laboratory comparison using a Zweigle G551 abrasion tester reveals that 100-35-sized yarns tolerate 15–20 % more rub cycles to thread break than yarns sized with 100-27 at the same add‑on, owing to the superior film toughness of the mid-viscosity grade. Yet the bending rigidity of the sized yarn, measured on a KES-FB2 pure bending tester, remains 12–18 % lower than that achieved with PVA 100-50, a critical margin when processing low-twist yarns destined for soft-hand fabrics. On Tsudakoma ZAX9100 looms equipped with pre-wet accumulators, stop counts attributable to sizing fall below 0.4 stops/10⁵ picks when 100-35 is combined with a low‑viscosity acrylic binder at 5 % on PVA weight. Pre-drying of the resin is recommended if storage RH exceeds 60 %; moisture uptake above 5 % in the as-received bag can extend dissolution time by 20–30 min and introduce lump formation in the cooker.
In a semi-batch VAc homopolymer emulsion process with 200 rpm anchor agitation and a jacket temperature of 70 °C, fully hydrolyzed PVA 100-35 is charged as a 10 % aqueous premix at a ratio of 4–6 phr relative to monomer. The high degree of hydrolysis — 98 mol% minimum — shifts particle nucleation from micellar toward graft‑co‑polymerization, leading to a bimodal particle size distribution typically centered around 0.8 µm and 2.5 µm (laser diffraction, Malvern Mastersizer). The resultant latex exhibits shear stability measured by a Denier cup (ISO 4576) exceeding 30 min without coagulum formation. Comparable recipes using partial-hydrolysis PVA 88-50 (88 mol% hydrolysis) produce smaller primary particles — 0.3–0.5 µm — and require post‑addition of a nonionic surfactant to prevent shear‑induced gellation during high‑speed pigment grinding. The grafting efficiency of VAc onto 100-35, estimated to be 20–25 % by solvent extraction, provides a covalent anchoring layer that suppresses desorption of the protective colloid during subsequent re‑dispersion of the dry powder. Limitations appear when anionic co‑monomers such as sodium vinyl sulfonate exceed 0.5 wt% on total monomer; competitive adsorption between the grafted PVA and the free sulfonate leads to a sharp increase in coagulum (from <0.1 % to >1.5 %) within the first hour of reaction, necessitating a switch to a higher molecular weight grade or a protective colloid with lower surface activity.
Granular PVA 100-35 placed in water at 20 °C swells but does not fully dissolve for 4–8 h without agitation. This stems from the high crystalline fraction (ca. 0.50 by FTIR crystallinity index) typical of fully hydrolyzed grades. Industrial practice for cold‑water adhesives therefore specifies pre‑slaking the powder with 30 % of the total batch water at 25 °C for exactly 15 min to avoid gel‑skin formation, followed by hot‑water injection to raise the mixture to 85–90 °C under a high‑shear rotor‑stator mixer (Silverson or equivalent, tip speed 15–20 m/s). Cooling to 20 °C produces a lump‑free solution within 60 min. When hot‑water jacketing is unavailable, a co‑solvent such as ethanol (5 wt% of total solvent) can accelerate cold dissolution by partially disrupting inter‑chain hydrogen bonding; published data for this specific configuration is limited, but laboratory tests show a viscosity plateau reached in 2 h at 20 °C with magnetic stirring. In wood‑bonding applications (DIN EN 204, durability class D2), 100-35-based adhesives developed bond strengths of 3.2–3.8 N/mm² on beech, comparable to 100-50 formulations but with 25 % lower gelling risk during open assembly times exceeding 15 min at 23 °C and 60 % RH.
Construction dry‑mix compounds — specifically cementitious tile adhesives conforming to EN 12004 C1 — incorporate PVA 100-35 at 0.5–1.2 wt% on total dry weight. The resin functions as a secondary water-retention agent and anti‑sag additive. Dual-component mortars containing 0.8 wt% 100-35 and 0.3 wt% methylcellulose ether (400 mPa·s, 2 % solution) maintained open time beyond 30 min on highly absorptive aerated concrete substrates (initial water absorption 1.5 kg/m²·min0.5), while the rheology allowed trowel ridges to retain shape without slump on vertical walls. PVA 100-27 at the same dosage gave 12 % lower water retention (measured by vacuum suction test per EN 1348) due to a less cohesive film formed during the initial hydration phase. Grade 100-50, conversely, increased the mortar’s dynamic yield stress beyond 450 Pa (measured on a Brookfield RST-SST rheometer with vane spindle), which field crews report as “sticky” and difficult to open with a notched trowel. The incompatibility of fully hydrolyzed PVA with high‑alumina cement must be highlighted; the alkoxide moieties generated during PVA dissolution can complex with aluminum ions, causing a flash set that is undetectable by Vicat needle (EN 196-3) until the mix loses workability within 90 s of water addition.
