Chemical Pump for Resin and Polymer Transfer

Why Resin and Polymer Transfer Is Not an Ordinary Pumping Duty

Resin streams change character through the process: a reactor feed may be a low-viscosity monomer while the product leaving the kettle is a thick, tacky melt or dispersion. The fluid must be defined at the actual transfer condition — viscosity, temperature, chemistry and solids — as explained in our guide to chemical pump selection based on fluid properties. Typical complications include:

• Viscosity spread — from free-flowing monomers and varnishes to pastes and melts above several thousand centipoise.
• Reactive chemistry — monomers, hardeners, organic peroxides, acid catalysts and solvents that attack common metals and elastomers.
• Temperature limits — many resins cure or set faster when warm, so pumping temperature is often kept low and flushing is routine.
• Shear and abrasion — filled polymers and pigment dispersions can be damaged or abrasive in the wrong pump.

Match the Wetted Materials to the Resin Chemistry

Resin formulations routinely contain aggressive ingredients, so the first decision is corrosion resistance. Qingdao Green Power publishes two complementary families in its industrial chemical pump range. The IH series, in SS304 or SS316L, handles mild chemicals, dilute acids and alkalis up to 80°C. Where the liquid attacks stainless steel — strong acids, oxidising agents, chlorinated monomers or catalyst systems — the IHF series with PTFE, FEP or PFA linings extends service to 100°C. Both share a series envelope of 3.5–400 m³/h flow and 4.5–125 m head across -20°C to 100°C. A fuller treatment of metal versus lined construction is in our article on chemical pump materials and corrosion resistance.

Centrifugal Chemical Pumps for Liquid Resins

When the resin or monomer is clean and free-flowing at pumping temperature, a centrifugal chemical pump gives continuous, non-pulsating flow at low cost per cubic metre. Wetted materials follow the chemistry: IH stainless for general-purpose unsaturated polyester, alkyd and acrylic systems, and IHF lined construction when strong-acid catalysts, oxidisers or solvent blends would corrode the metal. The impeller accelerates liquid from the suction eye and the volute converts velocity into pressure, so head — not pressure rating — is the sizing quantity; select within the 3.5–400 m³/h and 4.5–125 m series envelope and confirm the duty point on the actual curve.

Single-Screw Pumps for Viscous and Shear-Sensitive Polymers

Once viscosity climbs — hot-melt adhesives, concentrated polymer solutions, filled casting resins — a positive displacement pump takes over. The G-type single screw (progressive cavity) principle uses a helical metal rotor turning inside an elastomeric stator; sealed cavities move the product steadily from suction to discharge with low shear and a metered, pulsation-free flow of 0.1–150 m³/h at 0.6–2.4 MPa. Because the stator is the moving seal, its material must be matched to the monomers, solvents and temperature of your recipe, and it tolerates abrasive fillers better than gear designs. Never run the pump dry, and confirm the model, stator grade and speed for your viscosity — more in our high-viscosity chemical pump guide.

Seals, Flushing and Temperature Control

Resin that sets inside a pump is expensive to remove, so the peripheral design matters as much as the hydraulics:

• Shaft seals — single or double mechanical seals depending on leakage risk; a double seal with barrier fluid is favoured for hazardous monomers and solvents.
• Flush and drain — plan solvent or hot-oil flushing between batches and slope lines to drain so reactive material does not stagnate.
• Temperature — keep pumping temperature below the cure or gel point; confirm any heat tracing does not raise local resin temperature.
• Elastomer compatibility — seal faces, O-rings and stator materials must be checked against the full formulation, not just the base resin.

Frequently Asked Questions