What is the formulation for water based adhesives?
Formulating a water-based adhesive involves combining key ingredients tailored to the desired properties, such as tack, adhesion strength, flexibility, drying time, and durability. Here’s a general guideline for creating a water-based adhesive formulation:
Sample Formulation for a Water-Based PVA Adhesive:
Key Ingredients in Water-Based Adhesives:
1. Polymer Emulsion (40-60%)
(1) The backbone of the adhesive, providing adhesion and film-forming properties.
(2) Examples:
---Polyvinyl Acetate (PVA): Common for wood and paper adhesives.
---Vinyl Acetate-Ethylene (VAE): Adds flexibility and adhesion to non-porous surfaces.
---Acrylic Emulsions: Offers excellent weather resistance and durability.
---Styrene-Butadiene Rubber (SBR): High flexibility and water resistance.
2. Plasticizer (0-10%)
(1) Reduces brittleness and improves flexibility of the dried adhesive film.
(2) Examples:
---Di(2-ethylhexyl) Terephthalate (DOTP): A safer phthalate alternative.
3. Tackifier (5-20%)
(3) Enhances the adhesive’s initial tack and adhesion to surfaces.
(4) Examples:
---Rosin Ester Resins: For high tack and compatibility with various polymers.
---Terpene Phenolic Resins: For improved adhesion to difficult surfaces.
4. Thickener (0.5-2%)
(1) Controls viscosity and application characteristics.
(2) Examples:
---Cellulose Derivatives?(e.g., HEC, CMC): Water-soluble and efficient.
---Acrylic Thickeners: For high-viscosity formulations.
5. Preservatives (0.1-0.5%)
(1) Prevents microbial growth during storage.
(2) Examples:
---Benzisothiazolinone (BIT).
---Methylisothiazolinone (MIT).
6. Surfactants (0.1-1%)
(1) Enhances stability of the emulsion and compatibility of additives.
(2) Examples:
---Nonionic surfactants?like ethoxylated alcohols.
7. Defoamer (0.1-0.5%)
(1) Reduces foam during production and application.
(2) Examples:
---Silicone-Based Defoamers.
---Mineral Oil-Based Defoamers.
8. Water (20-40%)
(1) Acts as the solvent/carrier for the adhesive.
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9. Additives (Optional):
(1) pH Adjusters: Adjust pH for stability (e.g., ammonium hydroxide).
(2) Crosslinkers: Improve water resistance and strength (e.g., melamine resins).
(3) Colorants: For visual control during application.
Steps to Prepare the Adhesive:
(1) Mix the Base Polymer: Add the polymer emulsion into a mixing vessel.
(2) Add Water: Dilute to the desired viscosity.
(3) Incorporate Additives:
---Mix in plasticizers, tackifiers, thickeners, and other additives gradually.
---Maintain constant stirring to avoid lump formation.
(4) Adjust Viscosity: Use thickeners or water to reach the required consistency.
(5) Stabilize and Defoam:
---Add preservatives and surfactants to stabilize the emulsion.
---Use a defoamer to remove bubbles.
(6) pH Adjustment: Ensure the pH is within the stability range of the polymer (typically 4-8).
(7) Testing: Check adhesion, tack, and drying time on substrates.
Customization Based on Applications:
· For High Tack: Increase tackifier content (e.g., 15-25%).
· For Flexibility: Add more plasticizer or use flexible emulsions like VAE.
· For Water Resistance: Add crosslinkers or use waterproof emulsions like acrylics or SBR.
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About us
1.?The?sole actual producer of quality DPGDB/DEGDB?in China?except a multinational’s JV.
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3.?Environmentally friendly plasticizers to replace phthalate plasticizers?DOP,DBP,DINP,ect.
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3).?DPGDB&DEGDB blends, Ecod-flex 50/80/CA80
4). OTHER BLEND,Ecod-flex 290/332
Applications:
Applications: Water-born adhesives, Coatings&Paint&Ink, Coalescing agent, Caulks, Polysulfide/polysulphide Sealants, Hot-melt Adhesives,acrylic adhesives&sealants,Polyurethane&epoxy adhesvies&sealants&coatings&resins,ect. TPU industry: Polyurethane rollers, PU elastomer, PU prepolymer. PVC plastisol, PVC resilient flooring,,PVC coated cloth,Artificial leather, Textile auxilary. Pesticide, Glow stick carriers.
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