Single component reactive polyurethane membranes are a very popular product group due to their very high mechanical strength and good adhesion to the floor. Shelf life poses a serious risk if the necessary recommendations for manufacturers are not followed and a shelf life of 6 months is usually offered.

The product is basically a paint type product obtained as a result of some processing such as filling and coloring of a polymer containing a reactive tip (polyurethane prepolymer resin). It is a material applied to the floor with a roller or a similar equipment.

Curing in polyurethane prepolymer materials; The effect of humidity and temperature in the environment of the reactive groups at the ends occurs with the closing (bonding) of the ends. Ambient temperature and humidity are of great importance for the curing of the product. While the curing rate of the material is very low in cold weather, the curing time is much faster in hot weather in summer. Polyurethane prepolymer materials have NCO groups defined as reactive ends. These reactive groups provide drying, which we call curing, with the humidity in the air due to the following reaction.

As seen in the reaction, the reactive tips react with the humidity in the air. The rate of this reaction depends on the ambient temperature and humidity as mentioned above. It also shows why products made with this type of resin are not applied thickly. If a thick application is made, since the surface of the application absorbs moisture easily, it completes its reaction and causes the surface to close like a film. Since the resin on the substrate of the application cannot reach the moisture on the surface, it will take too long to dry and its adhesion to the floor will be very weak. For these reasons, applications should be made thinly.

Another advantage of the thin application is that the CO2 gas generated as a result of the drying reaction will be easy to rise to the surface and be ejected from the coating. In the thick application, the surface will be closed as it will dry quickly and the CO2 gas that may occur in the lower layers will not be able to escape from the surface and will create air gaps in the coating. These air gaps will directly affect the physical performance of the product, such as elongation and breaking force.

There are auxiliary drying materials that you can use in your systems to eliminate this problem in thick applications, to provide fast drying in thin applications and as a result to guarantee the mechanical performance of the product. Oxazolidines are such auxiliary drying (curing) agents. These materials reach the moisture in the air faster than the reactive NCO groups at the prepolymer ends (more selective) and react with their own moisture.

Due to the reaction with moisture, oxazolidine structures open, revealing NH2 (amine) groups. The resulting amine groups will be easier to react with the reactive ends (NCO groups) in the prepolymer structures. The reaction rate of NCO groups with amines is 400 times faster than with moisture (or polyols). In summary, it dries in the prepolymer as a result of a two-stage reaction.

The most important issue in the production of a single component product is the moisture in the material. This moisture usually comes from filling materials. It should be noted again that it is very important for the producers to be able to remove the moisture from the system. Otherwise, the shelf life of the products can be reduced to 2-3 weeks. Moisture continues the reactions in the material and drying occurs.

Our team provides all the necessary support for all raw material types required for production, supplier company information, optimum price, optimum performance recipes and methods to be applied.

In this section, some of our resins you can use are included in the following table;

Two-component polyurethane membranes are preferred in areas suitable for food, drinking water tanks and indoors. The properties sought in the product must be metallic components (catalyst) or its concentration must comply with international test standards in order to be absolutely safe in terms of health. The second important feature is the performance values.

Due to the oscillation of our structures, it is very important that the waterproofing materials stretch at certain rates. Non-resilient waterproofing material easily causes tearing, cracking and similar results in cases such as the oscillation of structures and earthquakes. In this case, the waterproofing process becomes completely worthless and the financial expenditure made for the insulation is also considered as a loss.

Products made with Polyol and isocyanate system (castor oil-polymeric MDI) in the classical approach will not have much elasticity due to the fact that their raw material structures have approximately 3 functionalities. It can even take a fragile form after curing at the end of 30 days. It is not possible for a fragile insulation material to isolate water.

In order for polyurethane membranes to gain flexible form, polyol or isocyanate components must add flexibility. You can even obtain highly elastic products with the choice of raw materials with both flexible structures.

As PURIN, we offer prepolymer products with different elasticity properties in the isocyanate part. Of course, our technical team supports the selection of these prepolymer hardeners and the formulations that will provide the cost-performance balance.

High elasticity, breaking force and adhesion performance and suitable pot life time are required from two component Bitumen-Polyurethane membranes.

Bitumen materials are already used as a stand-alone insulation material. However, since it is not high performance, it has started to be used by being formulated with polyurethane resins over time. When the high performance values of polyurethane resins are combined with the cost advantages of bitumen materials, products suitable for price and performance emerge.

In these systems, one component consists of bitumen and additives, while the other component consists of pure polyurethane resin. We can schematize our products designed as PURIN as follows.

Primers are materials that must be used for all kinds of coating materials and the amount of use per unit area is very low. The most important requirement for primers is that they adhere very well to the floor and do not rise from the surface with water coming from the negative direction. Polyurethane primer resins and ready-to-use primer products that we offer as PURIN are as follows;

When it is understood that the water insulation is not sufficient in the areas covered with ceramics, tiles and similar materials, the fastest solution is the coatings to be applied to the surface.

Waterproofing materials must be used under the surface coatings. Over time, water moves to the lower layers through the joints between coatings such as ceramics and tiles. If there is no waterproofing on the lower layers, water/moisture will move into the building over time. If there is a problem in waterproofing for any reason, removing the layer on the surface and making waterproofing and re-coating is a very laborious task.

The coatings, which can be made without removing the surface coatings and without spoiling the appearance of the coating, should be transparent, unaffected by the foot traffic on the surface and have good adhesion to ceramic and tile surfaces, which are seen as difficult surfaces.

One of our products above, solvent-based PURINCOAT SM 102 is a prepolymer-based material. Therefore, it is not suitable for use in humid environments. Water-based products are materials suitable for use on damp surfaces. PURINAQUA XR 101, on the other hand, is an auxiliary resin that can be used up to 10%, if desired, in water-based systems. With its addition, it helps the products to dry faster and to obtain a brighter product.

Product groups obtained with PUD systems, which are offered as innovative products in waterproofing membranes, are rapidly taking place in the market. The thought of moving away from solvent systems, the low performance in two-component systems and the systems that can prevent the slowness of application are membranes made with PUD resins.

This type of membrane has significant advantages for manufacturers, installers and end users;

• Eliminates yellowing problem with its aliphatic structure

• Shelf life is very long. Prepolymer-based 1K systems have a shelf life of 6 months, but pose a great risk for manufacturers if precautions are not taken. PUD systems can have a long shelf life of 24 months.

• It can be used in all kinds of places as a water-based environmental product.

• It offers very easy production opportunities for manufacturers. It does not have difficulties such as working under nitrogen and being formulated with desiccant systems like prepolymer type products.

• Expensive products such as desiccant, shelf life stabilizing agent, anti-air additives for performance do not require stocking costs.

• The humidity in the application area is not important. Since the products are already water-based systems, direct application can be made.

Our PURIN technical team will provide all the necessary support for the selection and production of the resin to be used in this type of innovative product.