Dispersion adhesives are water-based adhesive systems which form bonds through physical hardening when the water evaporates. The bonding effect is provided by a polymer component which forms a film when the aqueous component evaporates. Depending on the application and chemical basis of the adhesive it may be necessary to add an isocyanate crosslinker or nitrate hardener before processing. This can increase the bond’s resistance to heat and moisture.
Jowat supplies a wide range of powerful Jowacoll® dispersion adhesives used in the wood-processing industry, in the paper and packaging industry, the graphics industry, as well as in the automotive, textile and electrical industries, and which meet highest quality requirements in all applications. Dispersion adhesives of the latest generation facilitate high processing speeds with low plant costs. Another major requirement is the appearance of the bondline after film-forming. A high degree of gloss and high transparency of the dispersion adhesive very important, as is the prevention of discoloured joints.

Dispersion adhesives provide the following benefits:

  • easy processing (by roller, spraying and pouring)
  • ecological, due to water basis
  • good storage stability
  • tried and proven quality
  • low production costs
  • easy cleaning
  • uncomplicated disposal of water used for flushing and cleaning liquids
  • low emissions
  • processing at room temperature

Product series, characteristics and applications:

Jowacoll® copolymer dispersions

Basis: Acrylate
Application: (Gloss) Foil lamination for finishing printed products.
Characteristics: The mechanical processing characteristics of self-curing copolymer dispersions have been adapted specifically to the application system. These products are characterised by low foaming and a high yield, as well as by a high degree of gloss and a high resistance to mechanical stress of the finished product. The resistance can be increased further by using a two-component system and mixing the adhesive with a crosslinking agent.
 

Jowacoll® PVAc glue for flat bonding

Basis: Polyvinyl acetate
Application: Bonding of HPL panels in high-speed or stack presses, doubling of boards, corpus and assembly gluing, as well as gluing of middle layer rail stocks and ceiling elements.
Characteristics: PVAc glues for flat bonding, basically filled PVAc dispersion adhesives, have been developed specifically for application by roller and are therefore characterised by long processing times, long open assembly times, and short lap times. They largely meet the requirements for durability class D2 according to DIN EN 204/205. Special formulations from the Jowacoll® product series for flat gluing have been optimised to meet the high fire protection standards and support the flame-retardant properties of the bonded elements.
 

Jowacoll® PVAc assembly and lacquer glues

Basis: Polyvinyl acetate
Application: Bonding of wood and wood-based materials in small shops as well as in industrial applications, for instance frame bonding, pencil manufacturing, as well as board joints and block gluing.
Characteristics: Assembly and lacquering glues are generally unfilled adhesives of a relatively high quality, with different viscosities and elasticity depending on the application. PVAc dispersions are usually the adhesive of choice for assembly bonding operations. The formulations for this application facilitate very short pressing times.
Lacquer glues usually have a very high solvent content which is necessary to ensure a reliable bonding of surfaces coated with DD and NC lacquers, etc. A wide range of different dispersion adhesives based on polyurethane (PUR), polyvinyl acetate (PVAc), and ethylene-vinyl acetate (EVA) are used in this application.
 

Jowacoll® reactive D3 / D4 PVAc dispersions

Basis: Polyvinyl acetate
Application: Applications requiring durability classes D3 and D4 according to DIN EN 204/205. Several Jowacoll® PVAc dispersions also have the wheelmark approval (IMO) and can be used in shipbuilding applications.
Characteristics: Jowacoll® reactive PVAc dispersions facilitate a highly elastic and flexible bondline. Due to the crosslinking groups in the polymers, these adhesives provide a superior moisture and heat resistance compared to non-reactive PVAc dispersions. The crosslinking of the molecules is achieved by adding acid salts to the formulation. They can be added either by the manufacturer (1-component systems) or by the processor (2-component systems). For high requirements, the moisture resistance of one-component D3 systems can be increased further by adding an isocyanate crosslinking agent to the adhesive. Due to new manufacturing methods, reactive dispersions from the Jowacoll® product group have very low formaldehyde emissions.
 

Jowacoll® dowelling glues

Basis: Polyvinyl acetate
Application: For dowel gluing of soft- or hard-textured wood and particleboard on dowelling machines.
Characteristics: Jowacoll® PVAc dispersions for dowelling gluing are characterised by a tough-elastic glue film with joint-filling properties, and can be applied by nozzle applicators with pressurised containers and high-pressure pumps. Special additives prevent the dowelling glue from drying and clogging the nozzle, and facilitate a smooth operation after downtimes.
 

Jowacoll® PVAc postforming dispersions

Basis: Polyvinyl acetate
Application: Processing on postforming and KA machines, durability classes D2 and D3.
Characteristics: Postforming und KA glues are applied by roller or spray guns. They are characterised by good mechanical processing properties: No drying on the applicator roller, fast drying on the particleboard, no excessive drying (keratinization) on the surface of the applied glues, which facilitates the wetting of the opposite surface. Immediate downline processing of the bonded parts due to high initial strength.
Bonds with high heat and moisture resistances, as well as mechanical resistance in downline processing such as sanding and lacquering.
 

Jowacoll® foil adhesives

Basis: Ethylene vinylacetate copolymers
Application: Lamination of decor papers, PVC or also ABS foils.
Characteristics: Jowacoll® foil adhesives are used for cold and hot lamination. The glue can be applied on the substrate, the foil, or on both surfaces. Jowat foil adhesive formulations have been solvents-free for many years. The tried and proven product range as well as new products from the series of emission-reduced (ER) adhesives are characterised by very good adhesion to PVC and decor foils, high heat resistance, excellent mechanical processing characteristics, as well as a good storage stability even with a high solids content of up to 75 %. When mixed with a crosslinking agent, these adhesives can also be used in the production of multilayer flooring materials.
 

Jowapur® PU dispersions

1-component / 2-component hot sealing adhesives
Jowapur® PU dispersions are high-quality water-borne adhesives based on polyurethane. They are used to precoat materials and can be reactivated for bonding by heat at temperatures between 55 °C and 80 °C after they have dried. In general, the adhesive is applied only on one surface of the bonding partners. This has been the established method for many years, especially in the lamination of 3D furniture fronts and in the manufacture of decorative interior trim for the automotive industry (e.g. door lining and dashboards). The glues are used for the lamination of substrates with decorative thermoplastic foils (e.g. made of PVC, ABS, polyolefin or polyester), textiles or leather in vacuum deep-drawing methods as well as in press laminating. Which laminating process is used depends largely on the porosity or breathability of the materials to be bonded.
In general, these products can also be processed as one-component, non-reactive adhesives (for limitations, see TDS). However, experience has shown that the adhesion to the substrates can be improved significantly by adding a crosslinking component to the adhesive. Furthermore, it also provides a considerable increase in the resistance of the adhesive to heat, moisture and humidity as well as to plasticisers. These products are therefore used almost exclusively as two-component systems.
Innovative, one-component and reactive PUR dispersions from Jowat are an exception to the above. These products are already formulated with an optimum amount of crosslinking agent which is added when during the production of the glue. Customers can therefore process the adhesive directly, without having to add any crosslinker.