| HS Code | 738891 |
| Product Name | B17HX Chang Chun PVB Resin |
| Chemical Family | Polyvinyl Butyral |
| Appearance | White free-flowing powder |
| Viscosity 5 Methanol Solution At 25 C | 170 cps (typical) |
| Butyral Content | 80% |
| Hydroxyl Content | 19% |
| Residual Acetyl Content | 1% |
| Moisture Content | ≤1% |
| Molecular Weight Mw | 70,000 (typical) |
| Glass Transition Temperature | 72°C |
| Specific Gravity | 1.08 |
| Softening Point | 135°C |
| Tensile Strength | 50 MPa |
| Elongation At Break | 10% |
As an accredited B17HX Chang Chun PVB Resin factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | B17HX Chang Chun PVB Resin is supplied in 20 kg sealed paper bags with inner PE liner, ensuring safe, dry handling. |
| Container Loading (20′ FCL) | 20' FCL loading: B17HX Chang Chun PVB Resin, palletized, shrink-wrapped, securely braced to prevent shifting during transit. |
| Shipping | B17HX Chang Chun PVB Resin ships as non-hazardous dry resin in sealed multi-layer bags or drums. Protect from moisture, heat, and direct sunlight during transit. Ensure proper labeling, ventilation, and dry container conditions. No special dangerous goods documentation required for standard sea, air, or road freight. |
| Storage | Store B17HX Chang Chun PVB Resin in a cool, dry, well-ventilated area away from direct sunlight, heat, and ignition sources. Keep containers tightly sealed to prevent moisture absorption and contamination. Maintain moderate humidity and avoid extreme temperatures. Under proper conditions, shelf life is typically 12 months from manufacture date. |
| Shelf Life | Shelf life is typically 12 months from manufacture if stored sealed, cool, dry, and away from light. |
B17HX resin enters architectural laminated glass as the continuous polymer matrix of the interlayer, not as a post-applied modifier. In this application, the dry resin powder is blended with triethylene glycol bis(2-ethylhexanoate) or dihexyl adipate at 20–45 phr, with the actual level determined by the required melt flow during lamination. Adhesion control agents such as potassium acetate or magnesium acetate are introduced at 0.005–0.05 phr; UV stabiliser packages are typically 0.1–0.5 phr. The dry blend is de-aerated and melt compounded on a co-rotating twin-screw extruder with L/D 36:1–52:1, using barrel temperatures from 150 °C at the feed zone to 220 °C at the die. Melt temperature is held below 230 °C to limit thermal degradation of the polyvinyl butyral backbone. A gear pump and a flat die supply a polished chill roll stack; sheet thickness is normally 0.38 mm, 0.76 mm, or 1.52 mm, with embossed surface roughness Ra 5–25 µm depending on downstream autoclave de-airing requirements. Before lamination, the conditioned PVB sheet is stored at 20–25 °C and 25–35% RH to reach equilibrium moisture of 0.35–0.45 wt%. Moisture content below 0.2 wt% reduces edge sealing and can cause glass movement; moisture above 0.5 wt% generates steam pockets during autoclave heating.
Lamination of architectural glass using B17HX-based interlayer is performed either on continuous roller-heater lines or in autoclaves. A typical autoclave cycle holds the stacked lay-up at 120–150 °C and 10–15 bar for 60–120 min; cycle ramp rates are controlled at 2–5 °C/min to prevent viscous fingering and premature edge seal. Compliance testing uses EN ISO 12543-2 for appearance and durability, EN ISO 12543-3 for adhesion and moisture resistance, and EN 12600 impact classification; glazing in the United States is validated under ANSI Z97.1 and CPSC 16 CFR 1201. Pummel adhesion per ASTM D3354 is typically specified between 3 and 7 units for architectural glass, with lower values reducing impact retention and higher values increasing glass shard bonding but degrading edge stability under long-term moisture ingress.
Terminal finished product types for architectural laminated glass include facade glazing, overhead glazing, balustrades, elevator panels, hurricane-resistant windows, security glazing, and acoustic glass assemblies with multilayered interlayer stacks. The B17HX grade is not recommended for direct contact with silicone sealants containing high concentrations of unsupported alkaline amines, because base-catalysed hydrolysis can reduce edge adhesion; perimeter sealant compatibility should be verified by EN 15434 or equivalent structural sealant testing before production release.
Automotive PVB interlayers made from B17HX resin are formulated at 65–78 wt% resin solids with 20–35 wt% plasticiser, typically 3GO or dihexyl adipate, and 0.05–0.3 wt% phenolic antioxidant. The stricter plasticiser retention requirement arises from the windshield lamination process and long-term UV/heat exposure in a closed cockpit: additives that migrate to the glass interface reduce interfacial adhesion and create visible haze at the black ceramic frit edge. Formulations are therefore tested by thermogravimetric isothermal analysis at 120 °C for 24 h; acceptable plasticiser loss is typically below 1.0 wt%. Completed windshields must satisfy ECE R43 Annex 3 for optical deviation and mechanical strength, FMVSS 205 for the North American market, and GB 9656 for China. Production-scale data from flat-glass laminating lines show that extrusion defects such as gel particles and die build-up increase when the compounder reaches melt temperatures above 225 °C; therefore, vented twin-screw compounding with L/D 36:1–44:1 and temperature-controlled side feeding is used to maintain melt homogeneity. The sheet extrusion step, with slot die lip gap 0.8–1.5 mm, is followed by embossing with Ra 5–15 µm and chill-roll cooling to 20–35 °C. In automotive lamination, a heated calender or autoclave at 130–145 °C and 12–15 bar removes residual air, while the glass assembly is held in vacuum bags before final bonding.
Terminal products include windshields, laminated side glazing, panoramic sunroofs, and acoustic windshield configurations using a triple-layer PVB structure with a soft middle layer. For HUD-enabled windshields, a wedge-shaped interlayer is required; the wedge profile is measured by laser triangulation across the vertical centreline, and published design values for wedge angle are vehicle-specific rather than material-specific. B17HX may be used in the two outer layers of such constructions, while the soft middle layer is often a different PVB grade with lower glass-transition temperature. Published data for this specific B17HX grade in acoustic interlayer stacks is limited; validation should include modal damping measurement per SAE J1637 or equivalent customer specification.
In flexographic and gravure inks, B17HX resin functions as the polar film former that provides adhesion to corona-treated polyolefin surfaces, pigment wetting, and solvent-release characteristics. The resin is incorporated at 5–15 wt% of total liquid ink mass, commonly in a dry-binder ratio of 1:3–1:2 relative to nitrocellulose, with polyurethane co-binder at 2–8 wt% and plasticiser at 1–3 wt%. Dissolution is performed in a solvent blend of ethyl acetate, ethanol, isopropyl acetate, and n-propanol; B17HX is first dissolved as a 15–20 wt% clear solution, then pigmented through high-shear dispersion and bead milling to a 10–30 µm grind gauge specification. Printing viscosity is adjusted to 20–60 s on a Zahn cup #2 or 40–120 mPas by rotational viscometer, depending on the anilox cell volume and press speed. In food-contact surface printing, the finished package must meet European Regulation (EU) No 10/2011 overall migration limit of 10 mg/dm², and the ink is generally used behind a non-printed food-contact layer or functional barrier. Heavy metal content in the printed material is controlled under EU Directive 94/62/EC with total lead, cadmium, mercury, and hexavalent chromium not exceeding 100 mg/kg. Residual solvent concentrations are determined by headspace gas chromatography according to ISO 11890-2, with acceptance thresholds set by brand owners; if retained solvent exceeds 5 mg/m² on BOPP laminates, subsequent lamination bond strength can be degraded.
Downstream production uses central-impression flexo presses or gravure printing lines with drying tunnel temperatures of 60–90 °C and web speeds typically 100–400 m/min. B17HX-based inks are not suitable for direct aqueous dispersion; they require organic solvent recovery or thermal oxidation. Terminal finished products include surface-printed BOPP, PET, and cast PP packaging films, metallised film wrappers, and label stock where high rub resistance and solvent adhesion are required. For cigarette filter plug wrap, high-molecular PVB may provide improved adhesion to cellulose triacetate; published data for B17HX in this exact configuration is limited, so pilot-scale adhesion trials are required.
PVB-based wash primers use B17HX as the film-forming resin that resists phosphoric acid hydrolysis and binds to blasted steel or aluminium substrate. A two-component kit is prepared with Part A as a 7–12 wt% B17HX solution in an isopropanol/n-butanol blend, containing an adhesion-promoting zinc phosphate or organophosphorus compound at 3–8 wt%; Part B contains 85% phosphoric acid at 2–4 wt% of total mixed primer. The mixed pot life is generally 4–8 h at 20–25 °C; viscosity measured by flow cup may drift from 25 s to 45 s before gelation. The mixed primer is applied by HVLP or airless spray to a dry film thickness of 5–10 µm; flash-off is 15–30 min before application of a two-component epoxy or polyurethane topcoat. Over-application above 15 µm can trap acid at the interface and cause osmotic blistering after topcoat cure.
Compliance for steel surface pretreatment is aligned with ISO 12944-5 for corrosion category C2–C3, and the wash primer method is referenced in SSPC-Paint 27 for pre-treatment of iron and steel. Chromate-containing historical formulations containing zinc tetroxychromate are restricted in Europe under REACH Annex XIV; current non-chrome systems must be validated by salt spray per ISO 9227 with a scribe creep target of less than 2 mm after 240 h. Cross-hatch adhesion is tested under ISO 2409; acceptable results are class 0–1 on solvent-wiped steel. Terminal finished product types include pre-construction primers for structural steel, shipbuilding block primers, crane boom coatings, and adhesion layers for polyurethane body repair refinish systems. The system is incompatible with alkyd topcoats containing acidic drier packages because acid–base interaction at the interface can delay through-dry.
| Control Parameter | Test Method / Standard | Typical Acceptance Range |
|---|---|---|
| Dry film thickness | SSPC-PA 2 | 5–10 µm |
| Cross-hatch adhesion | ISO 2409 | Class 0–1 |
| Neutral salt spray scribe creep | ISO 9227 | <2 mm after 240 h |
| Mixed pot life | Flow cup | 4–8 h at 23 °C |
In multilayer ceramic capacitor and low-temperature co-fired ceramic manufacturing, B17HX is used as a sacrificial binder in non-aqueous tape-casting slurries. A typical barium titanate slurry is formulated with 100 parts ceramic powder, 4–8 parts B17HX, 2–5 parts plasticiser such as benzyl butyl phthalate, 0.5–1.5 parts phosphate ester dispersant, and 40–60 parts of a MEK/ethanol/xylene azeotrope-type solvent mixture. The slurry is milled in a bead mill to a Hegman fineness below 5 µm and cast onto siliconised PET at 25–200 µm wet thickness. Green tape tensile strength is measured by a universal test machine; values between 1.5–4.0 MPa are typical for adequate handling, but the exact response of B17HX in each dielectric powder system must be determined by rheometric measurement because published data for this specific grade in BaTiO3 slurries is limited.
After internal electrode printing and lamination at 60–80 °C under 20–50 MPa, the green bar is heated in a binder-removal furnace with a ramp rate of 0.1–0.5 °C/min to 350–450 °C. B17HX decomposes through acetal ring opening and oxidative removal; oxygen flow must be adjusted to avoid exothermic fronts that cause internal lamination cracking. Residual carbon after burnout is controlled below 0.05 wt% for X7R dielectric systems. Sintering for nickel-electrode MLCC is performed in a reducing atmosphere at 1100–1300 °C, followed by re-oxidation at 800–1000 °C. Finished products are tested under IEC 60384-1 and automotive electronics qualification under AEC-Q200; material restrictions follow ROHS Directive 2011/65/EU. Terminal components include X5R/X7R dielectric MLCCs, RF chip capacitors, LTCC substrates, chip inductors, and ceramic sensor elements. B17HX is not suitable for aqueous ceramic slurry systems because it does not disperse or dissolve in water without high shear; azeotropic solvent recovery is required in the casting area.
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Chang Chun B17HX PVB Resin is a medium-viscosity polyvinyl butyral powder used in solvent-borne wash primers, printing inks, heat-seal lacquers, and ceramic green-tape binders. The grade is supplied as a free-flowing white powder and is identified by the model designation B17HX within the B-HX series. Manufacturer-published typical values, confirmed by lot certificate of analysis, include a Brookfield solution viscosity of 15–25 cP for a 10 wt% solids solution in ethanol at 25°C, butyral content of 74–78 wt%, hydroxyl content of 18–21 wt%, acid value not exceeding 0.5 mg KOH/g, ash content not exceeding 0.05 wt%, and volatile matter not exceeding 2.0 wt%. Differential scanning calorimetry at 10°C/min typically yields a glass transition temperature of 68–72°C; specific gravity by ASTM D792 is 1.08–1.10. These values should not be transferred directly to formulation software without verifying the test solvent, drying history, and moisture content of the incoming lot.
| Property | Manufacturer-published typical value | Reference method |
|---|---|---|
| Solution viscosity of 10 wt% solids in ethanol at 25°C | 15–25 cP | ISO 2555 |
| Butyral content | 74–78 wt% | ASTM D1396 |
| Hydroxyl content | 18–21 wt% | ASTM D1396 |
| Acid value | ≤0.5 mg KOH/g | ASTM D1396 |
| Ash content | ≤0.05 wt% | ASTM D482 |
| Volatile matter | ≤2.0 wt% | ISO 3251 |
| Specific gravity | 1.08–1.10 | ASTM D792 |
| Glass transition temperature | 68–72°C | DSC at 10°C/min, second heating |
Lot-to-lot variation is controlled within the manufacturer specification. Incoming inspection should include Brookfield viscosity at 25°C, moisture by ISO 3251, and ash by ASTM D482 because solvent-borne coatings are sensitive to free water and ash contamination. B17HX is soluble in lower alcohols, esters, and ketones but is insoluble in aliphatic hydrocarbons and water.
Wash primer manufacture using B17HX begins with solvent letdown under high shear on production-scale equipment. The powder is wetted with anhydrous ethanol, isopropanol, or methyl ethyl ketone; a high-speed disperser with a sawtooth impeller running at tip speeds of 12–15 m/s prevents powder agglomeration. The 10 wt% solution viscosity of 15–25 cP allows passage through 50 μm bag filters. At higher solids, viscosity increases sharply and can exceed 250 cP depending on temperature and solvent selection. The addition of 2–8 wt% phosphoric acid based on resin solids activates the acid-PVB adhesion complex. On manufacturing lines, acid is added as a dilute alcohol solution under agitation at ≤35°C; localized acid concentration above 10 wt% may gel the resin. The final wash primer pH is commonly held between 2.5–3.5. Below 2.0, hydrolysis accelerates and viscosity drift becomes measurable. Amine-based pH modifiers should not be used because they neutralize phosphoric acid and produce hygroscopic salts that reduce corrosion-inhibiting adhesion.
Spray application uses conventional air-atomizing or HVLP guns with fluid nozzle sizes of 1.0–1.4 mm. The solution is reduced to 18–25 s on a Zahn #2 cup. Higher-viscosity B-20HX may require higher solvent levels and can reduce transfer efficiency on HVLP equipment. Lower-viscosity B-08HX gives faster solvent release and lower solution viscosity but yields lower dry-film toughness. B17HX is therefore selected when the wash primer must retain adhesion after bending or impact exposure. Salt spray qualification commonly follows ASTM B117 for 240 h; acceptance criteria are end-use specified, and published data for B17HX in this specific configuration is limited.
In rotogravure and flexographic ink letdown, B17HX is introduced as a 20–25 wt% solution in ethanol or ethyl acetate and used at 2–5 wt% of total ink solids. The resin improves pigment wetting and redissolvability on cylinder engraving. On flexographic presses running above 180 m/min, retained ethanol above 0.5 wt% can cause blocking at rewind tension above 20 N/25 mm. This is a production-scale limitation rather than a resin defect; solvent blends with higher ester or ketone content reduce residual solvent. For lamination and heat-seal lacquers on aluminum foil, B17HX is applied at 5–10 wt% solids. Heat-seal activation occurs at 110–130°C with dwell of 0.3–0.5 s; above 150°C, oxidative yellowing increases and roll blocking may occur. Adhesion on corona-treated polyester is tested by ASTM D3359-17 method B and typically reaches 4B–5B; flexibility is assessed by ISO 1519 with no cracking at 3 mm mandrel diameter. Published data for specific pigment systems is limited; carbon black grades with high DBP absorption can increase shear stress during dispersion.
The 18–21 wt% hydroxyl content of B17HX supplies hydrogen-bonding sites for metal oxides and phosphate crystals. In zinc-phosphated steel, this interaction contributes to adhesion after cross-hatch pull-off, but hydroxyl content above 21 wt% increases water sensitivity and can reduce salt spray resistance. The acid value of ≤0.5 mg KOH/g limits free acidity and minimizes ester hydrolysis during storage. If recycled alcohol solvent blends raise system acidity above 0.8 mg KOH/g, viscosity drift and acid-catalyzed degradation may occur. Storage above 30°C and relative humidity above 60% requires predrying or nitrogen blanketing.
Crosslinking with phenolic or melamine resins is possible under acid catalysis at 0.5–2.0 wt% p-toluenesulfonic acid based on total resin solids. Amine-based additives should be avoided because they neutralize acid catalysts and can form hygroscopic salts. In coil coating or metal decoration primers, B-08HX provides lower viscosity and easier pigment wetting but lower tensile strength after cure; B-20HX provides higher tensile strength but can exceed 300 cP at 25 wt% solids, restricting airless spray. B17HX balances sprayable viscosity and film toughness under high-shear application conditions.
Ceramic green tape formulations use B17HX as a temporary binder because ash content is ≤0.05 wt%. The powder is dissolved at 10–15 wt% in methyl ethyl ketone/ethanol or toluene/ethanol; the solution is milled with alumina, barium titanate, or silicon nitride powder and an organic plasticizer. Tape casting on a polyester carrier at 0.5–1.5 m/min uses slurry viscosity of 200–500 cP and doctor blade gaps of 200–500 μm. B17HX provides green strength for punching and stacking before thermal debinding. Lower-viscosity B-08HX reduces slurry viscosity but may produce brittle green tape; B-20HX may require additional solvent and can cause blade streaking. Thermal debinding must be validated by thermogravimetric analysis at 10°C/min because decomposition depends on oxygen partial pressure and ceramic powder surface area. Published data for B17HX in specific ceramic systems is limited; debinding schedules should be developed with the ≤0.05 wt% ash specification and without amine-containing dispersants.
Warehouse storage conditions for B17HX affect powder flow and solution viscosity. Drums should be kept sealed at ≤30°C and relative humidity below 60%; pallet stacking should not exceed 3 high to prevent powder caking. If moisture content exceeds 2.0 wt%, predrying in a desiccant dryer at 60°C for 2–4 h is used before solution make-up. Dust control requires grounded equipment; PVB dust-air mixtures can form combustible dust clouds. B17HX is incompatible with strong oxidizers, high-concentration mineral acids, and amine-functional additives. Contact with copper or brass may accelerate color development in alcohol solutions. The shelf life stated on the certificate of analysis is valid only for unopened drums under dry, indoor storage.
Relative to other PVB grades in the Chang Chun B-HX series, B17HX occupies an intermediate position in solution viscosity and film toughness. At 25 wt% solids, B-08HX gives lower viscosity and faster filterability, whereas B-20HX gives higher viscosity and greater solvent resistance. Compared with plasticized PVB film grades used in safety-glass interlayers, B17HX is supplied without plasticizer; elongation is lower, and tensile modulus is higher. Compared with non-PVB binders such as rosin-modified phenolics or cellulose acetate butyrate, B17HX provides better adhesion to glass, aluminum, and steel but lower resistance to hydrocarbon solvents and greases. Formulators replacing epoxy or polyurethane primers in thin-film metal pretreatment use B17HX in acid-catalyzed wash primers where chromate-free inhibitors require a PVB matrix with 18–21 wt% hydroxyl content. Direct comparison with PVB grades from other suppliers should not rely solely on viscosity labels; butyral content, hydroxyl distribution, acid value, and ash content must be compared on dry polymer basis. Incoming inspection includes Brookfield viscosity at 25°C, moisture by ISO 3251, and ash by ASTM D482.
