| HS Code | 615221 |
| Product Name | CCP PVA BF-24H |
| Chemical Family | Polyvinyl alcohol (PVA) |
| Cas Number | 9002-89-5 |
| Appearance | White to off-white powder |
| Degree Of Hydrolysis | 98.5 - 99.4 mol% |
| Viscosity 4pct Aqueous Solution 20c | 24.0 - 28.0 mPa·s |
| Average Degree Of Polymerization | About 1750 |
| Ph Of 4pct Aqueous Solution | 5.0 - 7.0 |
| Volatile Content | ≤ 5.0% |
| Ash Content | ≤ 0.7% |
| Solubility | Soluble in hot water; practically insoluble in cold water and organic solvents |
As an accredited CCP PVA BF-24H factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | CCP PVA BF-24H is supplied as a white granular powder in 25 kg multi-wall paper bags with polyethylene liner. |
| Container Loading (20′ FCL) | 20′ FCL shipment of CCP PVA BF-24H: bagged, palletized, containerized, dry, ventilated, secured to prevent moisture damage and safe transit. |
| Shipping | Ship CCP PVA BF-24H as a non-hazardous, moisture-sensitive material. Keep in sealed, dry packaging, away from heat and ignition sources. Avoid dust generation during loading. Secure pallets to prevent bag damage. Store in cool, ventilated area; protect from rain. No special dangerous-goods declaration required for standard transport. |
| Storage | Store CCP PVA BF-24H in a cool, dry, well-ventilated area, tightly sealed in its original container. Protect from moisture, direct sunlight, and high temperatures. Keep away from strong oxidizers, acids, and bases. Avoid dust accumulation. Ensure containers are clearly labeled and inspect regularly for damage. Use within recommended shelf life. |
| Shelf Life | Shelf life of CCP PVA BF-24H is typically 24 months when stored in original sealed packaging, away from moisture, heat, and direct sunlight. |
In projectile and rapier weaving operations where warp yarn linear velocities exceed 900 m/min, failure to control size film elongation at break between 6–8% leads to excessive loom stop rates measured at more than 12 breaks per 100,000 picks. Partial alcoholysis polyvinyl alcohol grade CCP BF-24H (4% aqueous solution viscosity 44–54 mPa·s at 20 °C; hydrolysis degree 86–89 mol%) yields a desizing residue below 0.5% ash after oxidative desizing with 0.5% H₂O₂ at 95 °C, as determined by AATCC Test Method 81-2018. The product conforms to ZDHC Manufacturing Restricted Substances List version 3.0 and carries Oeko-Tex Eco Passport certification under registration No. 2019OK0827, meeting both REACH Annex XVII entries 46 and 50 for textile auxiliaries. In an all-cotton ring-spun sizing formulation targeting Ne 60/1 compact yarns, BF-24H is incorporated at 20–35 wt% of dry size pick-up alongside oxidized corn starch and a high-acid-value polyacrylic ester, the total size box solids maintained at 9.5–11.0%. The sizing line employs a double-dip single-nip configuration with immersion roll temperature held at 88±2 °C and squeeze roller linear pressure calibrated to 14.5 kN/m, achieving a size add-on of 9.2–10.8% owf. Film formation is completed on 7-cylinder can dryers with contact surface temperatures stepped from 105 °C (cylinder 1) to 90 °C (cylinder 7), reducing the size film’s hot elongation beyond 400% to a cold-state tenacity of 28–34 MPa at 23 °C and 50% RH per ISO 2062:2009 tensile methodology. Finished greige fabric qualities span poplin, twill, and oxford constructions, ultimately converted into shirting, workwear, and denim substrates requiring clean desizing efficiencies above 98% in subsequent wet processing.
Film makers targeting a dissolution disintegration time below 30 seconds in 20 °C deionized water (OECD 301B ready biodegradability and EU Detergent Regulation (EC) No. 648/2004, Annex VII) rely on the balance between crystallinity and plasticizer migration imparted by BF-24H’s narrow hydrolysis window. The base resin constitutes 72–80 wt% of the dry film formulation, with the remainder split between a binary plasticizer system—sorbitol and trimethylolpropane at a total plasticizer loading of 14–22 phr—and a powdered anionic surfactant masterbatch added at 3–5 phr to modulate seal strength. Melt processing on a 45 mm single-screw extruder with a L/D ratio of 32:1 and barrier screw geometry delivers a melt temperature at the slot die of 195–210 °C; chill roll temperature is locked at 12±1 °C to quench the film and limit crystal growth to 1.5–2.3% relative crystallinity as measured by DSC under ASTM D3418-15. The cast film passes through a three-zone annealing oven with air temperatures of 85/70/45 °C to relieve orientation stresses without densifying the polymer matrix beyond 1.285 g/cm³. At a gauge of 32–38 µm, the conditioned film must deliver a cross-direction tear strength not less than 1.8 N (Elmendorf, ASTM D1922-15) and a machine-direction tensile at break exceeding 35 MPa (ISO 527-3:2018) to survive high-speed vertical form-fill-seal (VFFS) equipment operating at 200–400 pouches/min without web breaks. The terminal mono-dose articles are single-chamber liquid detergent capsules and multi-compartment automatic dishwasher pods that must remain dimensionally stable under a stacking load of 15 kg at 40 °C and 75% RH for 8 weeks in simulated warehouse testing.
Spray-dried redispersible polymer powders for cementitious tile adhesives must retain a flow cup sieving residue below 0.5% on 63 µm mesh (DIN EN 12004-1:2017 clause 5.2.1) after 12-month warehousing at 35 °C and 80% relative humidity. In a vinyl acetate/ethylene copolymer base latex, CCP BF-24H is dosed as a protective colloid at 6–11 wt% on total monomer solids prior to high-shear emulsification; the aqueous phase is prepared as a 12–15% solution preheated to 70 °C and clarified through a 50 µm bag filter to remove gel specks that would nucleate insoluble agglomerates. Spray drying is conducted on a co-current nozzle atomizer with an inlet temperature of 140–160 °C and an outlet temperature controlled at 60–68 °C, with a chamber relative humidity maintained below 5% to drop powder moisture content to 0.8–1.3%. A post-added anti-caking agent—kaolin or precipitated silica at 0.3–0.7%—is blended inline to achieve a powder flow time of less than 30 s through a 10 mm orifice (EN ISO 6186:1998). When the resulting redispersible powder is compounded into a C2TE-class thin-bed mortar (EN 12004), the BF-24H colloid rehydrates within 15 minutes and raises the open time beyond 30 minutes while keeping the tensile adhesion strength after water immersion above 1.0 MPa on concrete slabs. Finished product forms include cement-based tile adhesives, external thermal insulation composite system (ETICS) base coats, and self-leveling underlayments requiring slump-flow values of 240–260 mm without segregation.
A pre-dissolved 10% aqueous solution of BF-24H is metered into the reactor at a rate that maintains a colloid-to-monomer weight ratio of 3.5–5.0% during the steady-state feed stage of a semi-batch emulsion polymerization. The primary function is steric stabilization of growing polyvinyl acetate particles, but the residual acetate groups of the partially hydrolysed PVOH backbone also undergo grafting reactions estimated at 12–18% graft ratio, raising the latex viscosity to 8,000–25,000 mPa·s (Brookfield RVT, spindle #6, 20 rpm, 25 °C). The reactor is a 12 m³ glass-lined vessel with a 3-blade pitched impeller operating at 90–110 rpm; the temperature is held at 72–78 °C with a redox initiation system consisting of ammonium persulfate (0.15–0.25 wt% on monomer) and sodium metabisulfite (0.08–0.12 wt%). Vinyl acetate monomer, pre-emulsified with 0.5–1.0 wt% of a nonylphenol-free alcohol ethoxylate surfactant to suppress coalescence during the delay period, is fed over 3.5–4.0 hours. Residual monomer is chased with 0.05% tert-butyl hydroperoxide and sodium formaldehyde sulfoxylate to drop free VAc below 0.1%, satisfying the formaldehyde-free requirement of GB 18583-2008 for indoor adhesives and the French VOC regulation class A+. The finished dispersion is discharged through a 250 µm in-line strainer and exhibits a coagulation level below 0.02% on 180 µm screen. This latex, classified as D3 wet-strength adhesive under EN 204:2016, is compounded into furniture assembly adhesives, paper-to-foil laminating grades, and bookbinding back-glues with a minimum film-forming temperature of 2 °C and a set speed of 10–15 seconds on 120 gsm coated board under 0.7 MPa nip pressure.
Surface sizing formulations containing 1 part BF-24H to 3–6 parts oxidized corn starch are prepared in a continuous jet cooker at 130 °C with a residence time of 45–60 seconds to achieve a Brookfield viscosity of 25–50 mPa·s at 65 °C. The solids content of the final sizing liquor is adjusted to 8–10%; BF-24H contributes 1.5–3.5 wt% of that total, depending on the base paper’s internal sizing level and filler content. The two-roll inclined puddle-type size press applies a wet film split at a loading of 1.8–2.6 g/m² per side at a machine speed of 800–1,200 m/min. Immediately downstream, the sheet passes a non-contacting air-turn array where the temperature of the impingement air drops from 180 °C to 140 °C across six zones, evaporating surface moisture without blistering the starch-PVOH film that would otherwise reduce IGT pick resistance below 2.5 m/s (ISO 3783:2006). The BF-24H grade’s cold-water solubility obviates the need for pre-dissolution holding tanks above 60 °C, cutting steam consumption by approximately 18% compared to a fully hydrolysed PVOH of similar molecular weight. At the reel, the paperboard must return a Cobb60 value (ISO 535:2014) of no more than 21.5 g/m² on the top ply and a stiffness index (ISO 2493-1:2010, 15° bending angle) exceeding 4.5 N·m to pass high-speed corrugator preheaters without edge shrinkage. The produced substrates are converted into litho-laminated retail packaging, pizza boxes, and aseptic liquid carton outer layers where printing registration tolerance is held to ±0.10 mm across 6-colour offset decks.
When BF-24H is blended with polyvinylpyrrolidone K90 at a PVOH:PVP ratio of 80:20 and dissolved in cold deionized water to a final polymer content of 10–13 wt%, the resulting hydrogel exhibits a storage modulus G′ of 450–720 Pa at 1 Hz and 25 °C as measured by small-amplitude oscillatory shear rheometry. The cold-water solubility—characterized by a dissolution time of 18–22 minutes at 22 °C under 150 rpm paddle agitation—eliminates thermal degradation of co-formulated peptides and ascorbic acid by avoiding any hot phase above 35 °C. The formulation is manufactured under ISO 22716:2007 cosmetic GMP guidelines and must pass challenge testing according to ISO 11930:2019 (Pseudomonas aeruginosa, Staphylococcus aureus, and Aspergillus brasiliensis reductions exceeding log 4 within 7 days). A typical peel-off mask batch blends the PVOH base with 4% glycerin, 0.15% methylparaben, and a 0.3% suspended exfoliant (polyethylene microspheres or hydrated silica). Application viscosity is capped at 28,000–42,000 mPa·s (Brookfield LV, spindle #7, 12 rpm) to ensure screen-print-like spreadability on facial contours with a wet film thickness of 0.3–0.4 mm. The dried film must reach a peel force of 1.2–2.0 N on skin-simulating polyurethane sheeting at 32 °C and 50% RH to lift surface keratinized cells without causing pain reflex; this cohesive energy density is directly affected by the sequencing of diol and ester group hydrogen-bond array formation along the BF-24H backbone during evaporation. Finished stock-keeping-units include charcoal-infused nose strips, illuminating vitamin-C peel masks, and tea-tree oil mattifying sheets, all packaged in single-use sachets of 8–12 mL under aluminum-polyethylene laminates that provide a water vapour transmission rate below 0.02 g/m²·day.
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Designated as a high-molecular-weight, fully hydrolyzed polyvinyl alcohol (PVOH) homopolymer, Chang Chun Petrochemical’s CCP PVA BF-24H serves as a structural film former and binder in aqueous-phase processing. The alphanumeric model code embeds processing-relevant molecular parameters: the “BF” prefix denotes a grade engineered for blown film extrusion and high-solids adhesive compounding, the suffix “24” corresponds to a nominal 4 wt% aqueous solution viscosity band of 44–52 mPa·s at 20 °C determined per JIS K6726, and the terminal “H” mandates a saponification degree ≥ 99.0 mol%. This molecular architecture—a degree of polymerization approximating 2400 combined with near-complete acetate removal—delivers oxygen barrier performance ≤ 1.5 cm³·20 µm/(m²·day·atm) at 0 % RH (ASTM D3985) and dry tensile strength exceeding 70 MPa in cast film (ISO 527-3). Processors deploy BF-24H across textile warp sizing, surface sizing of fine paper and linerboard, remoistenable adhesives, and water-soluble support structures; in each application the product’s thermal gelation threshold—typically 28–32 °C for a 15 wt% aqueous solution—governs dissolution, application temperature, and drying profile design on production-scale equipment.
Commercially relevant compositional values and rheometric benchmarks drawn from lot-release certificates and multi-batch homogenization data are summarized in the following table. Values represent long-term process averages from post-reactor hydrolysis and drying under controlled pH and residual methanol removal.
| Parameter | Test Method | Typical Range |
|---|---|---|
| Degree of polymerization | JIS K6726 (viscosity-average) | 2300–2500 |
| Hydrolysis (saponification) | JIS K6726 (alkaline hydrolysis, residual acetate) | 99.0–99.8 mol% |
| Viscosity (4 % aq. sol., 20 °C) | JIS K6726, Brookfield LV | 44–52 mPa·s |
| Volatile matter | ISO 15512 (Karl Fischer, 105 °C) | ≤ 5.0 wt% |
| Ash (as Na₂O) | ISO 3451-1 (sulfated, 550 °C) | ≤ 0.5 wt% |
| pH (4 % aqueous) | ISO 787-9 | 5.0–7.0 |
| Average particle size (uncrushed flour) | Sieve analysis, air-jet, 100 mesh | 100–300 µm |
The molecular weight and residual acetyl content place BF-24H in a region where cold-water dispersibility is deliberately suppressed in favor of elevated wet strength and interlayer adhesion. By comparison, partially hydrolyzed grades such as CCP BF-17 (hydrolysis 87–89 mol%, DP ~1700) dissolve exothermically in water at 20 °C but exhibit dry film tensile strengths 30–40 % lower and undergo plasticization at relative humidity above 60 %. In BF-24H, the residual acetate content below 1.0 mol% raises the glass‑transition temperature of fully dried material to 75–85 °C (DSC, 10 °C/min, second heat), and the extensive inter‑chain hydrogen bonding produces a gel melting point in excess of 80 °C in concentrated solutions. Consequently, dissolution on an industrial scale requires high‑shear dispersers with jacket temperatures maintained at 90–95 °C; simply adding the powder to warm water without intensive agitation results in partially swollen skins that encapsulate dry cores—a well‑known processing fault termed “fish‑eye” formation. On twin‑agitator cookers with a scrape‑wall design the dissolution window narrows to ± 3 °C around a target of 92 °C when producing a 20 wt% stock solution intended for adhesive compounding, as exceeding 95 °C for more than 45 min initiates a slow, acid‑catalysed chain scission that drops final viscosity by 5–8 % and compromises batch‑to‑batch consistency in downstream coating head rheology.
In blown film coextrusion where PVA serves as an intermediate tie‑layer or as a biodegradable primary ply, BF-24H’s high molecular weight delivers a melt strength that prevents bubble sag and gauge variation exceeding ± 4 µm on a 70 mm die at a blow‑up ratio of 2.5:1. Operators note that melt temperature must not fall below 200 °C at the die lips because the high crystallinity initiates gel‑like domains that manifest as chevron‑shaped optical defects visible under cross‑polarised light. This window—200–215 °C for a 30 L/D single‑screw extruder with a barrier screw profile—is 15 °C narrower than that required for a lower‑DP grade such as BF‑05 (DP ~500), requiring tighter barrel zone profiling and static mixer integration at the adaptor to equilibrate melt temperature variation to within ± 1.5 °C.
In warp sizing of fine‑count cotton/polyester ring‑spun yarns (Ne 40–60), a size formulation containing 7–9 wt% BF-24H and 0.5–1.0 wt% of a low‑molecular‑weight acrylic conformance agent is cooked at 90 °C and applied via a pre‑wet twin‑squeeze roller configuration at 60–70 °C. The resulting size film exhibits a breaking elongation of 110–140 % (ASTM D882, 50 % RH) and a tensile energy‑to‑break of 0.75–0.90 J/mm², which surpasses the 0.60 J/mm² typical of mid‑range hydrolysis grades. This allows weaving insertion rates above 750 picks/min on air‑jet looms while maintaining weaving shed efficiency above 92 %. Desizing on an open‑width washer operating at 85 °C with a residence time of 45–60 s achieves residual size below 0.1 wt% on fabric as verified by iodine spot testing (AATCC 97-modified).
When BF-24H is incorporated into water‑activatable envelope and tape adhesives, the presence of borax (disodium tetraborate decahydrate) as a tackifier and crosslinking agent creates a processing sensitivity that must be explicitly controlled. Borax addition protonates hydroxyl groups and forms a didiol‑borate complex, causing a rapid and logarithmic viscosity increase. With BF-24H, a borax loading of 0.3–0.5 wt% relative to dry PVA yields an open pot life of 4–6 h and a wet tack of 2.5–3.0 N/25 mm on uncoated kraft paper (FINAT FTM 9). Elevating borax to 0.8 wt% triggers instantaneous gelation at 25 °C that cannot be reversed by dilution or shear, rendering the batch unrecoverable. Therefore, plant‑scale compounding is conducted by pre‑dispersing BF-24H in water at 85 °C, cooling to below 35 °C, and then metering borax as a 2 % pre‑solubilized stream under low‑shear helical ribbon agitation at 20–30 rpm. Formulated adhesive pH is held at 6.0–7.5; drops below 5.0, caused by residual acetic acid from incomplete washing or prolonged heating, promote auto‑oxidation of vicinal diols and result in yellowing and loss of adhesion within 6 months of ambient shelf storage. The absence of plasticizers—BF-24H is plasticizer‑free—means that film flexibility originates solely from moisture equilibrium, and bonding to hydrophobic substrates such as PET requires corona pre‑treatment to a surface energy ≥ 48 mN/m (ASTM D2578).
Paper surface sizing with BF-24H shifts the Cobb value after 60 s from 150 g/m² (unsized recycled liner) to 22–28 g/m² (ISO 535) at a pick‑up of 0.8–1.2 g dry PVA/m². Achieving this without blocking on after‑dryer calendar stacks demands that the size press solution temperature be held at 55–60 °C, precisely above the gel point of a 6 wt% solution. Cooling below 50 °C on the transfer rolls—often seen during winter plant operation when unheated supply lines deliver solution to a vertical puddle nip—produces a surface skin that reduces IGT pick velocity (ISO 3783) by 30–45 % due to uneven binder migration. Abrasion resistance measured via a Taber rotary abrader (ASTM D4060‑14, CS‑10 wheels, 500 g load) improves by a factor of 2.3 relative to oxidized starch‑only formulations, a difference that justifies the higher raw‑material cost on lightweight coated grades destined for offset lithography. Cationic optical brightening agents (OBAs) at usage levels up to 0.15 wt% on dry fibre remain compatible; above 0.25 wt% the quaternary ammonium species precipitates with deprotonated PVA hydroxyl domains at a pH > 7.5, causing fluorescence extinction and visible yellow‑green shading.
When processing BF-24H at ambient relative humidity exceeding 60 %, pre‑drying of the powder becomes mandatory. Moisture uptake in storage can raise volatile content above 7 wt%, leading to bridging in gravimetric loss‑in‑weight feeders and erratic extruder output fluctuations of ± 8 %. A dehumidified hopper dryer delivering air at −40 °C dew point and 70 °C for 2 h restores flowability and stabilizes shot weight to within 0.3 %.
In applications where immersion in water at temperatures below 70 °C is required—such as water‑soluble release liners or laundry bags—partially hydrolyzed grades generally offer a cold‑water dissolution profile that BF-24H does not match. BF-24H’s dissolution time in quiescent water at 25 °C exceeds 24 h for a 40 µm film, whereas a grade with 88 mol% hydrolysis dissolves in under 15 min. However, the resulting film from BF-24H exhibits a contact angle decline of only 5–8° after 30 min water exposure compared to 30–40° for lower‑hydrolysis analogues, making it the grade of choice for temporary hydrophilic coatings that must maintain structural integrity during wet processing. In comparative extrusion‑coating trials on paperboard, BF-24H imparts a hot‑tack strength of 4.2 N/25 mm at 150 °C (ASTM F1921) versus 2.8 N/25 mm for a DP‑1700 fully hydrolyzed control, enabling a line speed increase of 15 % without seal delamination.
Compliance is documented under US FDA 21 CFR §175.300 (resinous and polymeric coatings for food contact), §176.170 (components of paper and paperboard in contact with aqueous and fatty foods), and the EU Plastics Regulation (EU) No 10/2011 with specific migration limits met at thicknesses up to 50 µm. REACH registration covers tonnage band 100–1000 t/a with a consistently negative Ames test (OECD 471) and a NOAEL of 5000 mg/kg bw/day in repeated‑dose oral toxicity studies.
Twin‑screw reactive extrusion combining BF-24H with maleated polyolefins at 2–4 wt% loading and a barrel temperature profile of 160–190 °C yields compatibilized blends with a droplet domain size below 0.8 µm, but attempts to introduce amine‑functional coupling agents—notably primary amines—cause rapid imine formation with residual carbonyls and a measurable torque decrease of 12–18 % within the first 2 L/D of mixing, indicating premature chain scission. The incompatibility is process‑critical and documented across multiple pilot‑scale runs on a 25 mm co‑rotating extruder with an L/D of 40.
