Polyurethane glue - application, properties, characteristics
In the repair and construction industry, polyurethane is very often used glue, one-component or two-component. Such an adhesive composition is characterized by excellent adhesion to the surface, resistance and reliability to the effects of chemical microscopic elements. Before using the adhesive properties, you should first familiarize yourself with the types and features of application.
The sizing composition, which is made on the basis of polyurethane, has a special curing principle. The liquid begins to cure after prolonged contact with moisture, or after using a hardener.
After hardening, the surface on which the glue was located begins to be covered with a thin transparent film.
Polyurethane compound is universal, because it is used to connect objects from a variety of materials.
Such an adhesive composition is perfect for joining cardboard, ceramics, glass, gravel, polystyrene and rubber. The main advantages of the substance include the following:
- Strong connection.
- Moisture resistance and tightness.
- Resistant to high and low temperatures.
- Resistance to gasoline, oil, acids and other types of aggressive components.
Before you start using a sealant, you should first familiarize yourself with the distinctive properties of each variety.
To make the glue more viscous, acetone or other solvents can be added to it. The tackiness of the glue will be increased by the addition of synthetic resins. Such mixtures are sold ready-made, and their hardening begins after contact with water. In addition, curing starts when the air humidity is over 65%. Before using the product, this feature should be taken into account.
By the very name of the glue, it becomes clear that it contains two active substances at once. The first component is the combination of polyhydric alcohols with polymers, and such trace elements will be responsible for the composition's viscosity, strength and elasticity. The second component is diisocyanate, which is used to dilute the adhesive. Two-component adhesives have an incredibly wide range of applications, and the components that make up the composition are capable of providing high reliability of the connection. The initial grip of the components that are glued together will not begin to loosen even after decades.
It is resistant to high humidity levels as well as high and low temperatures.
Most people who are going to use such adhesives are interested in the specifics of production. An adhesive composition based on polyurethane is produced from microelements that are synthesized. Some manufacturers add components to it that help cure the applied polyurethane adhesive. Most often, a synthetic resin is used for this, thanks to which the mixture will become thicker and more viscous, and composite materials can also be added to the glue to improve the adhesive properties.
To increase the reactivity, hydroxyl-containing compounds are also added to the adhesive composition, and the addition of aminoimides is required to create a composition with moisture resistance.
To correctly apply the polyurethane adhesive, you should first read the instructions for use at the enterprise or at home.
Adhesives, which are made on the basis of polyurethane, are often used for industrial production and in the construction industry. Quite often they are used as a joint sealant between concrete slabs or sheet sheathing. Before applying the adhesive, the surface should be thoroughly cleaned of dirt and debris.
Also, everything is dried so that the coating becomes perfectly dry, because the assembly glue should never be applied to a damp base. When working with concrete materials, you will need to prime them with special primers, and only then use polyurethane-type glue.
In domestic conditions
For everyday life, such a mixture of polyurethane can be used for:
- Carrying out repair work. They are often used to secure finishing materials. In addition, glue, like polyurethane foam, is used to seal the seams.
- Shoe repair. A similar composition is suitable for leather, rubber, and other materials from which shoes are often made.
- Repair of furniture items. Adhesive mixtures based on polyurethane are suitable for gluing wood, which is why they are used for repair work for furniture.
When using the adhesive, the following sequence of actions should be followed:
In this case, the surface will be washed, dried, sanded and degreased.
And what to do if it was not possible to erase the glue in time?
Sometimes before using an adhesive, thin it a little. For this, special activators are used that can improve the thermal stability of the composition and increase its adhesive properties. But activators can only be used to dilute a two-component type liquid. If you need to dilute one-component glue, then you will need to use ordinary alcohol or water. You can also use special thinners that can be purchased at any hardware store.
These include ethyl acetate, methyl ethyl ketone, and acetone. Acetone is used to clean tools from glue residues, and if the mixture has not time to dry, then it is wiped off mechanically.
There are several features for storing polyurethane adhesive sealant, and they are worth familiarizing with:
- If the composition is in a closed container, then the storage temperature should be from +15 to +30 degrees above zero.
- The container with the composition should be placed away from light sources and heating devices.
- The adhesive should be placed in hard-to-reach places that will not be accessible to children.
- In an open container, the glue can be stored for up to six months.
Now let's look at the manufacturers.
There are some famous manufacturers who create a polyurethane sizing compound.
This is a two-component quality glue made in Italy. Most often, the tool is used for gluing wood products and laying parquet boards.
The advantages include elasticity, reliability and strength. Before use, the product should be mixed with a special hardener. The composition is stirred until a homogeneous mass is obtained from it. The prepared solution should be applied to the treated surface with a spatula. The tool freezes in 6 hours.
It is recommended to use this glue for working with rubber coatings. This is a two-component type mixture that tolerates low temperatures, high humidity levels and copes with most chemical elements.
Among the advantages are those that differ from other types of polyurethane glue:
Consider one more glue.
This is a one-component adhesive that is most often used in the construction industry ..
. They contain no hardeners and solvents. Experts recommend using this glue, as well as sheathe the surface with cotton wool boards or foam sheets. In addition, glue is considered a very good tool for gluing SIP panels to steel, aluminum or even plastic surfaces. It also has resistance to low and high temperatures, which makes it possible to use the composition for external work.
Anles one-component polyurethane glue is made from urethane rubber. The main feature of the glue is the high crystallization rate of the adhesive, and when creating such a substance, ethyl acetate and acetone are used.
The main properties of Anles are:
- Operating temperature approximately from +20 to +50 degrees above zero.
- Transparency after curing.
- Resistant to moisture.
- Resistance to low temperatures, which makes it possible to use the product outdoors.
- Resistant to acid and alkaline mixtures.
- High strength and elasticity.
When using the product, no more than 0. 15 kg of glue is consumed per 1 square meter.
The Alliance is the most famous adhesive for production needs, which is used to create sandwich panels. It is intended for use by enterprises that are equipped with special automatic lines for creating panels.
The main advantages include:
The composition will not allow moisture to pass through, and this will allow it to be used outdoors and in a damp room.
Consider another glue.
When creating pieces of furniture, "Cleon" is often used, which is required for working with wood.
This polyurethane glue for wood is produced in a small volume, approximately 0.4-0. 5 liters.
The main advantages are:
You probably know the next tool.
Among the views household adhesives can be distinguished by the composition "Moment", which is the most common.It is used when you need to quickly start gluing broken objects.
Experts advise using glue for gluing plastic products. It is suitable for working with metal, rubber, wood, glass and ceramic products. The only thing that this composition will definitely not be compatible with is polypropylene and polyethylene. It is not yet recommended to use such glue for restoring dishes and a container for storing food.
People who plan to engage in repair work and stick wallpaper on the walls can use this adhesive.
It is excellent for gluing paper-based products or gluing them to wood, cement and fiber substrates. Such glue is poorly protected from moisture and therefore it is used inside dry rooms. Prepare wall surfaces before wallpapering. It is important to grind them in advance, plaster them so that the coating is perfectly smooth. Further, the walls are evenly covered with adhesive, for which a roller or brush is used.
Adhesive polyurethane mixtures still have disadvantages, which are important to familiarize yourself with before using. The main disadvantages are the following:
In this case, the connection will be unreliable.
That's probably all.
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