| HS Code | 697883 |
| Product Name | Shuangxin 17-92 PVA (PVA 092-20) |
| Appearance | white granular powder |
| Hydrolysis Degree Mol Percent | 92.0-94.0 |
| Viscosity Mpa S 4 Percent Aqueous Solution 20c | 20.0-26.0 |
| Average Polymerization Degree | 1700 |
| Ph | 5.0-7.0 |
| Volatile Content Percent | <=5.0 |
| Ash Content Percent | <=0.5 |
| Purity Percent | >=98.0 |
| Bulk Density G Cm3 | 0.45-0.60 |
| Water Solubility | soluble in hot water above 80 C |
| Melting Point C | 180-230 |
As an accredited Shuangxin 17-92 PVA (PVA 092-20) factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Shuangxin 17-92 PVA (PVA 092-20) is packaged in 25 kg multi-wall paper bags with PE liner, ensuring dry, safe handling and storage. |
| Container Loading (20′ FCL) | Shuangxin 17-92 PVA (PVA 092-20) is packed in a 20′ FCL, with bags palletized and secured for safe transport. |
| Shipping | Shuangxin 17-92 PVA (PVA 092-20) ships as a dry, water-soluble powder. Packed in moisture-proof lined bags or drums, it requires dry, ventilated conditions away from heat and ignition sources. Non-hazardous per transport regulations, but avoid dust inhalation and contact with moisture during transit. |
| Storage | Store Shuangxin 17-92 PVA (PVA 092-20) in a cool, dry, well-ventilated area, away from direct sunlight, heat, and ignition sources. Keep containers tightly sealed to prevent moisture absorption, since the product is hygroscopic. Avoid dust accumulation and contact with oxidizing agents. Maintain stable temperatures and dry conditions to preserve quality. |
| Shelf Life | Shelf life is typically 12–24 months when stored sealed in a cool, dry place away from moisture and sunlight. |
Shuangxin 17-92 PVA (PVA 092-20) is a partially hydrolysed polyvinyl alcohol resin with nominal alcoholysis of 91–93 mol% and a viscosity of 20–26 mPa·s as a 4 wt% aqueous solution at 20 °C. The medium-to-high molecular weight and partial acetate content determine solubility, film formation, and interfacial behaviour in the downstream processes examined below.
For ring-spun cotton and cotton-rich CVC warps in the 40–80 Ne range, size formulations built on PVA 17-92 typically load the polymer at 55–70 kg per 1000 L of cooked size, equivalent to 5.5–7.0 wt% in the sizing box; in blends with thin-boiling starch or starch ether, the PVA fraction represents 60–70% of total dry matter. Compliance for such formulations on exported greige is managed under ZDHC MRSL Version 3.1, REACH Regulation (EC) No 1907/2006 Annex XVII, and OEKO-TEX® STANDARD 100 Annex 4 Class II for finished textiles. The cooking process uses a high-shear dissolver at 90–95 °C for 25–40 min, followed by filtration through a 60-mesh screen and delivery to a two-size-box slasher at 82–88 °C. Squeeze mangle pressure is set at 14–20 kN/m depending on yarn count; cylinder drying is run with first-can temperatures of 110–115 °C and subsequent cans at 95–100 °C, with line speed typically 45–80 m/min. Sized warps proceed to weaving as shirting, sheeting, workwear, and lightweight canvas.
At 5.5–7.0 wt% and 80 °C, Brookfield LV spindle 2 at 60 rpm reads approximately 45–85 mPa·s; above 8.0 wt%, size-box foam and reed deposits become batch-to-batch issues on high-speed weaving machines. Dried PVA film cast at 110 °C emits tensile strength above 35 MPa when tested per ISO 527-3, which permits lower add-on at 9–13% on cotton count 60 Ne without sacrificing loom efficiency. Desizing of high-PVA warps requires hot washing at 80–85 °C because the dried film does not hydrolyse under cold amylase desizing conditions.
Table 1. Size recipe and process parameters for cotton and CVC warp using PVA 17-92.
| Parameter | Cotton 60 Ne | CVC 45 Ne | Cotton 40 Ne |
|---|---|---|---|
| PVA 17-92 as dry solids | 62–70 kg/1000 L | 58–65 kg/1000 L | 55–60 kg/1000 L |
| Starch ether fraction | 25–30 kg/1000 L | 30–35 kg/1000 L | 35–40 kg/1000 L |
| Squeeze pressure | 16–20 kN/m | 15–18 kN/m | 12–15 kN/m |
| Size box temperature | 84–88 °C | 82–86 °C | 82–85 °C |
| Target add-on | 9–13% | 10–14% | 12–16% |
Semi-batch copolymerization of vinyl acetate with 10–20 wt% ethylene at 40–80 bar uses PVA 17-92 as the primary protective colloid. A hot 10–15 wt% aqueous PVA solution is maintained at 2.0–5.0 wt% based on total monomer feed. The reactor is a jacketed stainless-steel pressure vessel with turbine or maxblend agitation at 150–250 rpm; polymerization temperature is controlled at 85 ± 2 °C, and redox initiation uses tert-butyl hydroperoxide with sodium metabisulfite or sodium formaldehyde sulfoxylate. Residual vinyl acetate monomer is reduced below 0.1 wt% by post-polymerization chase with additional initiator and steam stripping. Compliance for food-contact adhesive uses is evaluated under FDA 21 CFR 175.105 and Framework Regulation (EC) No 1935/2004. Viscosity drift between batches is reduced when the PVA solution is cooked at 88–92 °C for at least 30 min and filtered through a 100 µm bag before entering the reactor. Above 5.0 wt% PVA on monomer, the protective-colloid layer becomes more hydrophilic, and water resistance of the dry adhesive film measured by EN 204 D2 classification may decline. The resulting high-colloid VAE dispersions are transferred to packaging adhesives, wood-working dispersion adhesives, and carpet-backing compounds.
At 0.8–1.6 g/m² dry pickup per side on a metered film press, surface size formulations for woodfree fine paper use PVA 17-92 at 5–15% of total surface-size solids; a 10 wt% starch solution is modified with 1.0–2.5 wt% PVA 17-92 and applied at 60–70 °C. The size is cooked in a jet cooker at 120–130 °C and then cooled; filtration through 80–100 µm screens prevents rod streaks. Application on the paper machine at 800–1500 m/min requires controlled viscosity of 40–150 mPa·s at 100 rpm and rod pressure of 0.35–0.60 bar. IGT pick resistance measured by ISO 3783 and Parker Print Surf roughness measured by ISO 8791-4 are typical quality gates; food-contact paperboard produced with the surface size must comply with FDA 21 CFR 176.170 or BfR Recommendation XXXVI depending on the final food type. Terminal papers include offset printing grades, inkjet base stock, and coated linerboard. Published data for this specific configuration is limited where coat-weight interaction with pre-dried moisture fluctuates across machine direction; pickup stability therefore depends on moisture-profile control rather than PVA concentration alone.
Dry-mix formulations containing 0.4–1.0 wt% PVA 17-92 are prepared in a twin-shaft paddle mixer at 80–120 rpm for 180–240 s; the PVA is blended with 0.3–0.5 wt% cellulose ether and 30–40 wt% ordinary Portland cement prior to water addition at 20–23 wt%. PVA 17-92 increases water retention and wet adhesion in interior gypsum-based skim coats and basic cementitious wall putty; performance is assessed by EN 1015-11 for flexural strength, ASTM C109/C109M-20b for compressive strength, and EN 998-1 for render classification. The polymer is not a direct substitute for redispersible polymer powder in demanding EN 12004:2007 + A1:2012 C2 tile adhesive; outdoor or highly flexible applications require additional hydrophobic polymer. PVA 17-92 should be stored below 60% RH before dry blending because absorbed moisture leads to lump formation in the twin-shaft mixer. Terminal products are interior wall putty, gypsum plasterboard joint filler, and repair mortar.
For alumina and silicon nitride slip systems prepared for dry pressing, PVA 17-92 is added at 1.5–3.0 wt% dry polymer on ceramic solids. The binder is pre-dissolved to an 8–10 wt% aqueous solution and introduced to aqueous slip at 65–70 wt% solids alongside 0.2–0.5 wt% ammonium polyacrylate dispersant. Spray drying uses a rotary atomizer at 10,000–15,000 rpm, inlet temperature 230–260 °C, outlet temperature 95–115 °C, yielding target granulate of 80–120 µm. Pressing is conducted at 120–180 MPa on hydraulic or die presses; green density is controlled to 58–63% of theoretical density by Archimedes immersion. Thermal debinding is carried out in a furnace ramped at 0.3–0.5 °C/min to 500 °C with a 2 h hold, leaving residual ash below 0.02 wt% when tested by loss on ignition. Compliance for electronic ceramic parts follows RoHS Directive 2011/65/EU Annex II and REACH; granulate storage above 60% RH causes moisture uptake, agglomeration, and press fill instability. Terminal products include alumina substrates, technical ceramic parts, and silicon nitride wear components.
Spiral-tube laminating lines running at 30–80 m/min use PVA 17-92 solution at 8–12 wt% combined with 30–50 parts dextrin per 100 parts PVA solution, yielding a final PVA dry content of 4–7 wt%. The adhesive is hot-mixed at 70–80 °C with an anchor agitator at 30–60 rpm and applied at 40–60 °C through roller applicators; nip pressure is maintained at 0.2–0.5 MPa to avoid squeeze-out. Borax or boric acid adjustment is avoided because the diol–borate complexation of PVA 17-92 increases viscosity beyond the stable application window. Compliance for packaging uses is assessed under FDA 21 CFR 175.105 for indirect food contact, and repulpability is checked by mill-specific TAPPI-based repulping methods. The product is designed for repulpable paper cores, spiral tubes, and honeycomb edge board.
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Shuangxin 17-92 PVA (export designation PVA 092-20) is a partially hydrolyzed polyvinyl alcohol resin whose model code denotes a nominal degree of polymerization of 1700 and a nominal hydrolysis of 92 mol%. The resin is supplied as a white to off-white granular or powder solid. The grade occupies a medium-viscosity position between low-viscosity partially hydrolyzed products such as 05-88 and high-viscosity fully hydrolyzed products such as 17-99. On typical commercial certificates of analysis, the 4 wt% aqueous solution viscosity at 20 °C is reported in the range 21.0–33.0 mPa·s, hydrolysis is 91.0–93.0 mol%, pH is 5.0–7.0, volatile matter is ≤5.0 wt%, ash is ≤0.5 wt%, and sodium acetate is ≤0.8 wt%. Viscosity is commonly determined by capillary viscometry using ISO 3105 or the corresponding GB/T 12010.2 method. Lot-specific values differ with manufacturer drying and neutralization conditions and must be confirmed before scale-up.
| Property | Typical range or limit | Test basis |
|---|---|---|
| Appearance | White to off-white granular or powder | Visual inspection |
| Hydrolysis | 91.0–93.0 mol% | Saponification titration |
| Viscosity, 4 wt% aqueous solution at 20 °C | 21.0–33.0 mPa·s | ISO 3105 / GB/T 12010.2 |
| pH | 5.0–7.0 | Electrometric pH meter |
| Volatile matter | ≤5.0 wt% | Oven loss on drying |
| Ash residue | ≤0.5 wt% | Muffle furnace ignition |
| Sodium acetate | ≤0.8 wt% | Titration or ion chromatography |
Dissolution of Shuangxin 17-92 is controlled by particle size, water temperature, agitation regime, and the residual acetate content of the grade. The 92 mol% hydrolysis level allows complete hydration at 85–95 °C without the sustained >95 °C hold often required for 99 mol% grades. In production-scale dissolvers, a pre-slurry of dry resin in cold water at 15–30 °C is prepared with a high-speed disperser or turbine mixer before steam injection or jacket heating. Heating rate in unbaffled tanks should not exceed 2 °C/min to prevent particle fusion; in baffled tanks with pitched-blade turbine agitation at 300–600 rpm, heating may be increased to 3–5 °C/min. A hold at 90–95 °C for 30–60 min is typical. Direct contact between dry powder and hot water can produce gel specks because gelled outer layers encapsulate unhydrated resin cores. In high-shear rotor-stator mixers, cold-water pre-slurry followed by inline steam heating reduces batch time but can generate stable foam due to surface-active residual acetate groups; mechanical vacuum deaeration or defoamer addition may be required.
Viscosity build in a heated dissolver is influenced by water hardness. Calcium and magnesium ions above 200 mg/L as CaCO3 can promote surface skin formation and reduce solution clarity; softened or demineralized water is preferred. If the solution is held at 90–95 °C for more than 4 h, atmospheric oxygen can reduce molecular weight and lower viscosity. Nitrogen blanketing or vacuum mixing is used where viscosity drift must be limited. The batch hold-temperature window is normally controlled within ±5 °C; below 85 °C undissolved gel particles may remain, while prolonged exposure above 95 °C can accelerate hydrolysis drift and viscosity loss.
Warp sizing of spun cotton and polyester-cotton blends uses 17-92 at 8–14 wt% solids in a size box held at 85–90 °C. The medium polymerization degree provides film toughness and abrasion resistance, while the 92 mol% hydrolysis improves adhesion to polyester fibre compared with fully hydrolyzed 17-99. Sized-yarn tensile retention measured by ASTM D2256 remains within ±5% of unsized yarn when size pick-up is controlled; actual retention is influenced by yarn twist, size-box squeeze pressure, and weaving-room humidity. Desizing is performed in hot water at 80–95 °C or by oxidative/enzymatic desizing systems because the film remains water-soluble after drying.
Films cast from 17-92 at 10 wt% solids and dried at 40–60 °C develop tensile strengths typically below those of 17-99 films at equivalent degree of polymerization and thickness but show higher elongation at break and better adhesion to polyester, regenerated cellulose, and starch-coated paper. Equilibrium moisture regain at 50% RH is higher for 17-92 than for 17-99 because residual acetate groups disrupt crystallinity. For packaging films requiring high gas barrier performance, 17-92 is generally not the first-choice PVA because lower-hydrolysis and higher-barrier formulations may be selected; published oxygen transmission rate data for this specific product is limited and should be generated on the target film line.
Extrusion of 17-92 into water-soluble film or monofilament requires plasticization with glycerol, sorbitol, or water. A twin-screw extruder with an L/D ratio of 24:1 to 36:1 and water-injection capability is used to limit thermal degradation. The processing window is narrow because the resin decomposes near its melt-processing temperature; barrel temperatures for plasticized feed are commonly staged from 80–95 °C at the feed zone to 180–220 °C at the die. Published data for Shuangxin 17-92 in melt extrusion is limited; pilot trials are required before production.
In polyvinyl acetate emulsion polymerization, 17-92 is used as a protective colloid at 1–5 wt% based on monomer mass. The residual acetate content of approximately 8 mol% provides interfacial activity while retaining sufficient water solubility. In jacketed semi-batch reactors with anchor or pitched-blade agitation, 17-92 at 4 wt% on monomer mass usually yields lower final reaction viscosity than 17-99 at equivalent solids; the actual viscosity reduction depends on initiator feed profile, monomer composition, and reactor temperature. For adhesive compounding, 17-92 provides tack and open time on porous substrates. Fully hydrolyzed 17-99 yields higher final shear strength and water resistance but requires hot-water dissolution and is more prone to skinning in storage. Lower-viscosity 05-88 dissolves at lower temperature and wets surfaces more rapidly but produces films with lower tensile strength and greater cold-flow than 17-92.
| Grade | Hydrolysis | Viscosity, 4 wt% aqueous at 20 °C | Process-engineering implication |
|---|---|---|---|
| Shuangxin 17-92 | 91.0–93.0 mol% | 21.0–33.0 mPa·s | Balanced film strength and warm-water solubility; medium-viscosity protective colloid |
| 17-99 | 99.0–99.8 mol% | 25.0–35.0 mPa·s | Hot-water dissolution required; higher film water resistance; higher reactor viscosity |
| 05-88 | 86.0–89.0 mol% | 4.5–6.0 mPa·s | Low-viscosity stabilizer and emulsifier; reduced film tensile strength |
| 24-88 | 86.0–89.0 mol% | 44.0–54.0 mPa·s | High-viscosity grade for thick films; slower dissolution and higher shear demand |
Vinyl acetate-ethylene emulsions and post-added adhesive thickeners can also incorporate 17-92. In continuous or semi-batch vinyl acetate-ethylene polymerization, the grade is often blended with a low-hydrolysis specialty PVA to tune particle-size distribution and freeze-thaw stability. Published data for Shuangxin 17-92 in this specific configuration is limited; pilot-scale evaluation in a 20–50 L jacketed reactor is recommended before production use.
In vinyl chloride suspension polymerization, partially hydrolyzed PVA grades are used as secondary suspending agents. 17-92 may be combined with a primary low-hydrolysis high-molecular-weight grade to balance droplet size and resin porosity. Published data for Shuangxin 17-92 in suspension-PVC reactors is limited; bench autoclave trials are necessary because droplet behaviour depends on agitation geometry, water-to-monomer ratio, and initiator type.
In paper surface sizing, 17-92 is applied at 2–6 wt% solids as a starch/PVA blend. The medium viscosity improves film strength and reduces surface dusting, but addition above 8 wt% may exceed the operating viscosity range of air-knife or blade coaters, especially at 50–60 °C application temperatures. The grade is not recommended for strongly alkaline papermaking systems above pH 9.5, because extended exposure at 70–80 °C can shift hydrolysis and reduce viscosity. For ceramic green-body binder use, the ≤0.5 wt% ash specification is acceptable for many but not all electronic ceramics; quantitative green-strength data for this specific product is limited. Binder demand should be determined by three-point flexural testing and thermogravimetric burnout analysis.
Borax or boric acid is an incompatible additive at levels above 0.5 wt% of PVA solids in neutral aqueous solutions; borate ions form a reversible crosslinked gel. If a viscosity response is deliberately required, dilute borate solution should be injected under high-shear mixing with continuous pH monitoring. Strong acids, strong bases, and oxidizing agents should be avoided in storage and formulation because oxidative depolymerization of the polyvinyl alcohol backbone can occur.
Store in sealed bags or silos at 10–35 °C and relative humidity below 60%. Moisture uptake above 5 wt% can cause clumping and errors in gravimetric dispensing; pre-drying at 60–80 °C for 1–2 h may be required before dissolution. Dust from the powder is combustible; grounding and explosion-venting should follow local dust-handling standards. The resin has a shelf life commonly set at 24 months from production when stored in unopened, undamaged packaging; confirm with the supplier. Regulatory acceptability for indirect food-contact use must be verified against the specific packaging or coating regulation, for example 21 CFR 176.170, 21 CFR 176.180, or EU 10/2011. Polyvinyl alcohol is registered under EU REACH, but the product-specific compliance statement is required for final articles.
For food-contact packaging, migration of low-molecular-weight fractions from PVA into food simulants is a function of film thickness, degree of hydrolysis, and plasticizer type. PVA films are hydrophilic and swell in high-moisture foods; migration testing under EU 10/2011 conditions should be conducted on the finished film. In retortable or hot-fill applications, barrier performance may decline because the film partially dissolves or swells; published data for Shuangxin 17-92 in retortable structures is limited.
