Rigid Foam Systems
Fundamentally these systems are produced for isolation purposes. Foam systems produced for filling and packaging purposes are also low density foams.
Polyol system and polymeric isocyanate mix enlarges and makes a rigid foam by the help of a blowing agent. The foam produced has a 92% closed cell structure and has a rigid structure because of this they are called rigid foams. They are good thermal isolators. For this reason they are mainly used as heat isolators.
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Flexible Foam (Cold Cure) Systems
Flexible foam has limited flexible and reshaped properties with open cell structures. It is known as sponge by public. Low density foam (13-40 kg/m3) is produced in continous line by slabstock technology. High density foam is produced in discontinue line by molding. In molding technology polyol and isocyanates are injected by injection machine. As a result of reaction, the foam takes the shape of the mold with a flexible structure. The prepolymer isocyanates are used in this reaction are TDI or MDI based. If polyol systems are not used with the right isocyanates, there can be some technical problems or desired foam cannot be obtained. Semi flexible or memory foam (visco) are in this type. Today with developing technologies, the desired foam with various hardness, flexibility and density can be produced easily.
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RIM-Integral Polyurethane Systems
RIM products are high density, hard and stroke resistant. Two components polyurethane systems with special formulation that are injected into the molds by high pressure machines, are formed RIM products.
Outer parts of automotives are produced by RIM technology. They have wide usage in automotive fields. RIM are abbreviation of Reaction, Injection and Moulding.
Reaction: It begins with two or more components mixture
Injection: Application of transferring mixture into the moulds
Moulding: Moulding the mixtures as a result of curing to obtain the desired products.
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Elastomer Systems
These systems that are hard with high density, have limited flexiblity during the impact. After the impact they can take its previous shape. They can resist on friction, high heat and abrasion. They have long elongation and good absorption features for impact.
Since elastomer systems have high level and multiway physical properties, they can have wide application field in automotive, floor coating and shoe fields.
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Polyurea Sprey Elastomer Series
Polyurea spray coatings technology is a recent development in the polyurethane coatings
industry. The polyurethane chemistry is about 60 years old. Since the 1970s elastomeric
urethane coatings have been available. The polyurea elastomer technology was
introduced some 10 years later. Two main application areas are Reaction Injection
Moulding (RIM) and sprayable coatings.
Polyurea coatings combine extreme application properties such as rapid cure, even at
temperatures well below 0°C, and insensitivity to humidity, to exceptional physical
properties such as high hardness, flexibility, tear strength, tensile strength, chemical and
water resistance.
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Block Foams Chemicals
Low density foams that have 15-40 kg/m3 densities are produced with block foam technology. In continuous lines they can be produced as blocks with width around 2.4 meters and length of up to 30 meters.
Polyether polyols with TDI are the main source of base materials for the production. MDI can also be used as a substitution for TDI.
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Auxillary Chemicals
The reaction of Polyol and isocyanate does not occur only because of these materials chemical properties and thermal energy. There are other products affecting the reaction. They are catalyses. Although it is possible to get a lot of reactions with isocyanate in order to get a certain structure certain catalysts have to be used. Catalysts also play a significant role in the technical properties of the product. For example; the viscosity of the mix, skin formation, cell formation and all the technical properties of the final product. In some cases catalyst combinations has to be used.
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Release Agents
Release agents are chemical mixtures used to detach the produced polyurethane from the mould easily and without deformation. Release agents prevent soldering by making a thin film between the polyurethane system and the mould thus making easy separation possible.
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