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Adhesive for polypropylene and polyethylene

Polypropylene and polyethylene are materials that are quite difficult to bond. If you do not use welding, then the process of connecting the two elements will be problematic. Among other things, surfaces need preliminary initial preparation. Alternatively, polypropylene glue can be used.

The main types of adhesives

If you need it, you should know that it has two varieties: thermosetting and thermoplastic composition. The basis of the first are epoxy, thermoset and polyester resins. The second category of adhesives can be divided into two directions, the first is made on the basis of rubbers, while the second is based on resins.

Thermoplastic compounds soften materials and dissolve under the influence of temperature. If we compare them with thermosets, they do not change their chemical structure when glued, which is a significant plus. Glue for polypropylene can also be divided by the number of components, such mixtures can be one- or two-component. The first are presented in finished form in one package. This includes Moment glue for polypropylene. And the second is packaged in two packages, each of which contains ingredients for mixing. As an example of a one-component composition, consider Cosmoplast 500, which is used to connect profiles in window production. If you need a two-component composition, then you can use it for plastic, which is made on the basis of a hardener and has the advantage of a long shelf life. The reason is that the ingredients do not come into contact before joining and no curing occurs.

Main characteristics of Cosmoplast 500 adhesive

The above adhesive for polypropylene acts as a one-component composition that can be used in industry and everyday life. It can be applied to 45° angle. This mixture outperforms its counterparts in a shorter drying time. The composition is resistant to water, cold and heat. Its approximate drying time is 3 seconds, and the final curing time at 20°C is 16 hours.

Cosmoplast 500 user manual

If you decide to use the above adhesive for polypropylene, you should first familiarize yourself with the features of its use. It is necessary to apply the mixture from a measuring container or together with Cosmoplast CA, which is a measuring device. Application should be carried out on one side of the surface, which must first be cleaned of dirt and dust, and dried. Cleaning can be done using special tools like "Cosmofen 60". The surfaces must be bonded and subjected to pressure for a certain time before drying in the open air. Due to the low viscosity, the described composition may not withstand the tension of the glued gap. If there is a need to connect large gaps, then Cosmoplast 564 can be used at the discretion.

Glue cleaning

Adhesive for gluing polypropylene can be cleaned in an uncured form using Kosmoplast 597. Washing the measuring container from uncured glue is carried out using the same tool. If the glue has already dried, then you can clean it manually. When the surfaces contain solvent, already dried adhesive can be completely removed.

Specifications for Dow Corning 7091 Adhesive Sealant

This polypropylene adhesive sealant is a viscous fluid mass that is used to seal joints and protect various surfaces. The composition can be used for gluing homogeneous materials together. Among the main characteristics of this glue are the following:

  • the ability to seal and glue different materials;
  • heat resistance;
  • resistance to ultraviolet rays;
  • durability;
  • high adhesion with different materials;
  • high elasticity of the seam.

It should be remembered that the sealant may be characterized by an acidic type of curing, this indicates that the composition has the ability to release a certain amount of acetic acid during the curing process. This can cause the destruction of non-ferrous metals and their corrosion. Marble and some other materials should also be included here. This adhesive is universal, it is convenient and easy to use, it has the qualities of water resistance and resistance to chemicals and vibration. It can be operated at temperatures from -55 to +180 °C. This adhesive for polypropylene transparent cures at room temperature, it has good adhesion without additional priming with conventional materials. The composition is capable of acting as an adhesive with a layer thickness of up to 5 mm, it can be used as a sealant if a layer of up to 25 mm is formed. When applied, it is a pasty non-viscous consistency. After the curing step is completed, the consistency resembles elastic rubber. Among the qualities, one should single out the ability to seal homogeneous materials and those that have different coefficients of thermal expansion.

Why Choose Dow Corning 7091 Adhesive Sealant

The above-described adhesive for PP and PE has the properties of oil resistance, moisture resistance, high elasticity and strength. It is easy to apply, among other things, it is able to withstand temperatures from -55 to +180 ° C.

Application features

Sealing surfaces must be degreased, cleaned and dried. Degreasing is possible with solvents such as acetone or The required amount of sealant should be applied to one of the surfaces, and then the two bases should be joined. You can correct the relative position of the parts within 15 minutes after application, until a film forms on the surface of the adhesive. If the conditions of room temperature and relative humidity of 50% are met, then the vulcanization rate will be equal to 2 m per day. If the humidity is reduced, then the setting time will increase.

Characteristics of WEICON Easy-Mix PE-PP two-component adhesive

This composition is a two-component mixture for gluing polypropylene and polyethylene. It is made on the basis of acrylate and has a high bonding strength of low-energy plastics and plastics. It is noteworthy that pre-treatment of the surface is not necessary. This composition is universal, so it can be used for gluing polyamide, polyvinyl chloride, polycarbonate, polymethyl methacrylate, as well as fiberglass and other materials.

Conclusion

If using one of the above compositions you plan to glue polypropylene pipes, then the temperature in the room should be in the range from +5 to +35 ° С. It is important to have a glue gun, a natural bristle brush, and a pipe cutter. Before applying the adhesive composition, the edges of the cuts should be cleaned, only in this way it will be possible to obtain a high reliability of the seam.