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KIKI’S CHEMICALS
Polyurethane & Neoprene Contact Adhesive Compounding
Chemical application profile

Polyurethane & Neoprene Contact Adhesive Compounding

Intense polar solvation of thermoplastic polyurethane (TPU) and polychloroprene rubbers for high-tack footwear, upholstery, and carpentry contact glues.

Target SectorsIndustrial Chemicals for Manufacturing Plants in Kenya · Paints, Coatings & Resins Chemical Raw Materials Kenya
Packaging25kg Bags · 200L Drums · IBC Tankers · Bulk Delivery
DocumentationBatch COA, TDS & SDS Available on Request
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TARGET SECTORS:
Industrial Chemicals for Manufacturing Plants in KenyaPaints, Coatings & Resins Chemical Raw Materials Kenya

Quick Answer — Polyurethane & Neoprene Contact Adhesive Compounding

Ethyl Acetate 99.8% Min dissolves TPU and polychloroprene elastomers to formulate high-solids contact adhesives, providing 10-15 minute open times and instant green tack, with low moisture (<500 ppm) protecting isocyanate hardeners for 90°C heat-resistant footwear bonds.

Contact adhesive compounding is the industrial dissolution of elastomeric polymers in volatile solvents to manufacture instant-bonding liquid adhesives.

Key Facts

  • •Rapidly dissolves thermoplastic polyurethane (TPU) and polychloroprene.
  • •Guarantees water content below 500 ppm to preserve isocyanate hardeners.
  • •Provides 10 to 20 minutes open time for shoe lasting and laminating.
  • •Supplied in 180 kg steel drums by KIKI'S Industrial Chemicals.

Primary Use Cases

Leather footwear sole attaching and shoe assemblyFormica, veneer, and high-pressure laminate carpentryAutomotive upholstery and foam bonding

Technical Process

In contact adhesive manufacturing plants, solvent blending and polymer dissolution follow rigorous physical processing:

Polymer Dissolution and Viscosity Balancing

Granular thermoplastic polyurethane (TPU) or masticated polychloroprene rubber is charged into explosion-proof dissolver tanks equipped with cowles or paddle agitators. Pure Ethyl Acetate 99.8% Min is pumped in alongside co-solvents (Acetone, MEK, Hexane, Toluene). High shear untangles polymer chains over 4 to 6 hours, yielding a smooth, viscous liquid adhesive with 15% to 22% solids.

Tackifier and Cross-Linker Incorporation

Tackifying resins (terpene phenolic, alkyl phenolic) and magnesium oxide stabilizers are blended in. For high-heat footwear lasting (sole attaching on leather and EVA footwear), two-component adhesives are blended on-site with 3% to 5% polyisocyanate hardener. Because KIKI'S Ethyl Acetate maintains moisture strictly below 500 ppm, the isocyanate hardener does not suffer premature deactivation.

Application and Open Time Dynamics

When applied onto shoemaking leather, rubber outsoles, or formica counter tops, the adhesive flashes off in 10 to 15 minutes. Once the two tacky surfaces are mated under pressure (pneumatic sole press), instantaneous polymer chain interdiffusion occurs, creating permanent bonds that resist heat, oil, and flexing.

KIKI'S supplies adhesive blenders with low-moisture Ethyl Acetate 99.8% Min, commercial n-Hexane, and Toluene for balanced contact adhesive formulations.

Standard Application Process

  1. 1

    Polymer Dissolution in Dissolver

    Charge TPU or polychloroprene into explosion-proof vessel with Ethyl Acetate; shear for 4-6 hours to complete solution.

  2. 2

    Resin & Tackifier Incorporation

    Blend in phenolic tackifiers and metal oxide stabilizers to optimize green tack and peel bond strength.

  3. 3

    Two-Component Isocyanate Activation

    Dose 3-5% polyisocyanate hardener on-site for high-heat footwear sole bonding.

  4. 4

    Substrate Mating Under Pressure

    Flash off solvent for 10-15 minutes; press surfaces together under 4-6 bar pressure for instantaneous bond.

Recommended Chemicals for Polyurethane & Neoprene Contact Adhesive Compounding

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Industrial Solvents
200kg steel drum of Ethyl Acetate 99.8% Min supplied by KIKI'S Industrial Chemicals Nairobi Kenya

Ethyl Acetate 99.8% Min Pure (Fast-Evaporating Ester Solvent)

High-purity Ethyl Acetate 99.8% min (CAS 141-78-6, UN 1173) supplied in 200kg steel drums and IBCs by KIKI'S Industrial…

Used for: Flexible Packaging Rotogravure & Flexographic Ink Solvation · Polyurethane & Neoprene Contact Adhesive Compounding · Pharmaceutical Active Ingredient Extraction & Recrystallisation
200kg Steel Drum (Epoxy-Phenolic Lined)1000L / 890kg UN-Approved Composite IBC

CAS 141-78-6 · Industrial Pure Grade · Liquid

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Key Performance Advantages

  • ✓
    Instant Green Tack and High Initial Strength

    Enables immediate shoe lasting and furniture handling without long clamping times.

  • ✓
    Zero Moisture Interference with Isocyanate Hardeners

    Water content <500 ppm guarantees maximum cross-linking density and 90°C heat resistance.

  • ✓
    Complete Evaporation with No Trapped Solvents

    High vapor pressure ensures the glue line cures hard without residual solvent bubbling or plasticization.

Key Industrial Use Cases

Footwear sole attaching and leather shoe lasting adhesivesCarpentry decorative laminate and formica contact adhesivesAutomotive headliner, door panel, and seat upholstery bondingFoam mattress and flexible polyurethane foam assembly glues

COMMERCIAL & TECHNICAL GUIDANCE

FAQs — Polyurethane & Neoprene Contact Adhesive Compounding

Technical and process guidance for polyurethane & neoprene contact adhesive compounding in Kenya and East Africa.

Ethyl Acetate rapidly dissolves crystalline thermoplastic polyurethane (TPU) polymers and evaporates cleanly within 10 to 15 minutes, allowing shoes to be de-lasted immediately.