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What is Hot Melt Pur glue? Features and applications

Hot melt Pur is a thermal glue with the main ingredient is Polyurethane. Glue is widely used in industry, especially in the production of furniture. We will conduct a more in-depth analysis of this glue shortly.

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What is Hot melt Pur glue?

Hot melt Pur (Keo Pur) is Reactive thermal glue Full name is Polyurethane hot melt adhesive. The main ingredient of pur glue is resin Polyurethanes (PU). The article will go into each concept so that customers have a better view of this type of thermal glue.

  • Heat glue (hot melt adhesive) also known as hot melt glue is classified into 2 types as react , and no response. If the "non-reactive thermal glue" can only be cooled to solidify, the "reactive heat glue" (pur glue) is solidified through a chemical reaction.
  • The chemical reactions create cross-linking in the glue, which increases the adhesion. Reactive thermal adhesives adhere easily to low surface energy (LSE) materials. Besides, the chemical reaction also helps the glue reduce the resistance, increase the electrical insulation of the material.

Hot melt pur glue is a non-reactive thermal glue whose main ingredient is polyurethane

The famous Pur glue company today must be mentioned Kleiberite. This is a glue imported directly from Germany with high adhesion. German Kleiberit glue is used by many decorative material manufacturers as a bonding agent, limiting peeling on products.

Features of Hot melt Pur

Hot Melt Pur Adhesive is a heat-reactive adhesive that should be able to adhere to LSE materials including:

  • PVC (Polyvinyl Chloride)
  • PE (Polyethylene)
  • PP (Polypropylene)
  • Teflon (Poly Tetra Fluorethylene)
  • Acrylic – PMMA (poly methyl methacrylate)

Besides, the characteristics of Polyurethane material give the glue many preeminent features, such as:

  • Tough, hard to tear, wear-resistant and inelastic.
  • Chemical resistant and waterproof, no grease.
  • Resistance to environmental agents such as oxidation, weather, etc.
  • Has sound and electrical insulation and fire suppression.

The original shape of pur glue was a solid tube or block. We use heating devices to turn glue into liquid form. Then, we apply glue to the surface of the material (wetting) and then wait for the glue to dry and return to a solid state (solidification).

The original shape of Pur glue is solid
The original shape of Pur glue is solid

Specifications of Pur . thermal glue

Glue application time (Open time) is the amount of time the glue adheres to the surface of the material. Set time is the time it takes to press two surfaces tightly together. These two time periods are determined based on four factors: the adhesive (adhesive), the surface material (substrate), the amount of glue used and the temperature. The melting point of Pur thermal glue is 2 - 4 degrees Celsius.

The glue's highly specialized specifications are the Pot Life index and the MFI index. In which, Pot Life index is the stability index of Pur glue before re-deposition and the MFI index is the index indicating the viscosity of the glue. The more viscous the glue, the lower the molecular weight. Some Pur glue lines on the market have an MFI index of 30.000 mPas / 140 ºC.

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Outstanding advantages of Hot Melt Polyurethane Glue

The most outstanding advantage of Hot Melt Polyurethane glue is long shelf life , and No need to worry about risks when storing and handling. The glue does not contain water or solvents, does not go through the drying system, so no harmful waste emissions, safe for people and the environment. Not only that, the glue also has the function fire suppression effective.

In the structure of Kosmos wood imitation plastic sheet, there is a layer of Pur heat glue made by Kleiberit Germany, safe for users.
In the structure of Kosmos wood imitation plastic sheet, there is a layer of Pur heat glue made by Kleiberit Germany, safe for users.

Polyurethane hot glue is easily applied to the melting device and the thickness of the glue is completely preserved when used. This feature makes pur glue stand out more than many water or solvent glues, the thickness of which is reduced by 50 - 70% after drying. In particular, the drying time of pur hot melt glue is very fast, which saves time and improves productivity.

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Disadvantages of Pur Thermal Glue

The disadvantage of hot melt glues is that they are sensitive to temperature, not just Pur glue. We should avoid exposing the glue to excessive heat. This disadvantage is partly overcome after allowing the glue to react with the catalyst.

On the other hand, Pur glue (heat-reactive glue) costs more than EVA glue (non-reactive thermal glue). At the same time, it is not possible to manually apply this hot melt glue, but only through modern machinery.

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Application of Hot melt Pur

Hot Melt Polyurethane Adhesives are often applied on assembly lines. The industries that commonly use this hot melt glue are:

  • Textile: The material increases the durability of the fabric.
  • Diapers: Adhesive edges without harm to skin.
  • Electronic: adhesives for electronic components, smartphones, etc.
  • Printing: book binding glue.
  • Build: edge pasting, material surface pressing
Hot melt polyurethane is used to glue electronic components
Hot melt polyurethane is used to glue electronic components

The effect of Hot melt Pur glue on interior products

Pur heat glue is not too strange in the production line of interior decoration materials. Edge glue and coating on the surface provide outstanding water resistance for materials, especially wood-based products. Using pur glue, we do not need to be reinforced by high heat pressure, so it is suitable for joint production with materials such as: plastic wood panels, pvc film, vinyl, acrylic.

The fast-adhesive, fast-gluing ability of the glue is extremely suitable for high-speed continuous surface coating lines. On the other hand, the chemical reaction of the glue with the surface of the material increases moisture resistance and fire resistance. Not only suitable for use in humid environments such as outdoors, toilets, ... Polyurethane thermal glue is also used when processing seagoing ships.

Polyurethane hot melt adhesive helps Kosmos pvc panels effectively prevent fire
Polyurethane hot melt adhesive helps Kosmos pvc panels effectively prevent fire

Kosmos stone grain PVC sheet with Pur glue application imported from Germany

Kosmos is a brand of high quality decorative plastic wall panels. Kosmos stone grain pvc panels It is composed of many layers and is bonded by Hot Melt Polyurethane glue. Above all, the glue is imported directly from Germany, a country with a high reputation for product quality.

Kosmos stone-grained pvc sheet factory processes pur thermal glue under the pressure of 3 rollers. The machining process requires professional machinery to keep the glue quality stable. We can completely rest assured about the quality of Kosmos panels because the machinery applies advanced German technology.

Kosmos stone grain pvc sheet has hot melt pur glue in its structure
Kosmos stone grain pvc sheet has hot melt pur glue in its structure
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Summary

Hot melt Pur is a type of thermal glue that is widely used in the furniture industry. The use of glue is to bring water resistance and durability to the material. The stickiness of pur thermal glue is extremely high and the drying speed is extremely impressive. At the same time, the glue does not emit toxic substances, safe for users' health.

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