Adhesives


PQ Corporation manufactures sodium silicate products that can be used as Adhesives in several applications, such as those involving paper, wood, and fabrics.  Soluble silicates in aqueous solutions have physical and chemical properties that are useful in adhesive applications.  Liquid silicates are inexpensive, readily available, and convenient.  When applied as a thin layer on or between surfaces of other materials, the silicate solution dries to form a tough, tightly adhering inorganic bond. Silicate films can exhibit the following characteristics: low cost and non-flammable, resistant to temperatures up to 1600 °C and non-toxic.
PO's latest development, PREXSIL™ sodium silicate, serves to extend phenol-formaldehyde resins in adhesives for plywood.  PREXSIL replaces up to 25% of the phenolic resin in the adhesive formulation with no sacrifice in final bond quality and delivers net savings of 10-15%. 
How It Works
Silicates are water-based solutions of polymeric silica.  When properly applied, sodium silicates penetrate the surfaces to be joined.  Liquid silicates begin to dry by losing moisture to the air and to the substrate itself.  As this occurs, the viscosity increases becoming tacky and sticky. Eventually the silicate dries to form a hard, glasslike bond. In addition to bonding, the silicates harden and strengthen the substrates.

Silicates usually work well with porous or semi-porous surfaces, where the silicate can partially penetrate the surface. Silicates can also bond metal and glass, but surfaces must be roughened or attacked chemically to make sure that a good physical bond can be formed. Typical applications include: adhesive for corrugated board, tubewinding and foil-to-paper lamination adhesive.
Applications
Plywood

Spiral Tubes and Cores

Paper/Metal Foil Laminates

Paperboard Laminates

Corrugated Board

Health, Safety &
Environment
    |    North America    |    EMEA    |    Mexico    |    South America    |    Asia Pacific