Two-component polyurethane is apolymer, which is made by mixing two ingredients. The first is isocyanate compounds, whereas the second may be compounds of the hydroxyl group. Elements interact, resulting in a polymer with a polyurethane structure.
To obtain the polymer it will be necessary to mixhardener and base in certain proportions. A two-component polyurethane can be a cold and hot polymerization species. The latter version of the material requires exposure to an elevated temperature, whereas the former is polymerized at a natural temperature.
The materials described, which are used forforms, have high strength characteristics, they are resistant to corrosive environments and harmful effects, as well as high temperatures. All these features expand the field of use of polyurethane. It is suitable for production:
After mixing the components the composition acquiresexcellent fluidity, which makes it possible to manufacture parts from it using casting technology. As an example, one can distinguish bushings for mechanisms. In the article we are talking about a two-component polyurethane casting variety. The material properties are determined by the source components. The composition of the isocyanate hardener and the substrate is important here.
The material properties can vary depending on thefrom the addition of various substances, for example, fillers and dyes. Some polyurethanes replace rubber, because they have high elasticity. You can find polyurethanes, which are able to restore the original form with mechanical damages, this makes them especially valuable in the industry.
Two-component polyurethane has found wideSpread. Used material for the manufacture of jewelry, various mechanisms and casting gears. The operational properties of the parts produced are quite high. This allows the material to be used even in difficult conditions. As a result, it is possible to obtain viscous, hard and chemically resistant parts. As the last can act:
The parts are ready to serve qualitatively and for a long time, after allthey are resistant to wear and have high strength. Liquid elastic two-component polyurethane lies in the basis of wheels for trucks and forklifts. As a result, it is possible to obtain products that are much stronger than rubber. They are ready to work even if the tread is damaged.
Material is the basis of supportive andGuide rollers, which are operated in conjunction with belt conveyors and conveyors. Elements are ready to last much longer than rubber belts, caterpillars and tracks.
The material is used for shock absorbers andsealing elements, because it has a higher resistance to wear and durability. That is why rubber parts have recently been replaced with polyurethane ones. Elasticity remains at the same level. Two-component injection molded polyurethane has found application in the production of pipelines, which are characterized by chemical resistance and strength. Elements are obtained as a whole. In addition, with the help of the material, it is possible to protect the pipelines not only from the inside, but also from the outside.
According to consumers, a two-componentPolyurethane is used in the production of glue compounds and paint and varnish products. The mixture after polymerization turns out to be resistant to external negative influences, it is firmly held and ready to last for a long time. Liquid polyurethane is especially often used in the manufacture of molds, which are performed using casting technology. Subsequently, such products are used for casting:
According to consumers, a liquid two-componentpolyurethane is also used in the field of medicine, where the material is the basis for removable dentures. Polyurethane is often used also in the manufacture of jewelry. From it you can even pour floors that are characterized by durability, resistance to wear and high resistance to stress.
Как утверждают потребители, в некоторых областях Parts made of polyurethane exceed steel by a number of parameters. However, the manufacturing process is much simpler, which allows you to get miniature parts and massive castings at the output, the first of which can weigh not more than a gram, while the latter can have a mass of 500 kg or more.
Two-component polyurethane for mold makingis able to withstand a certain number of castings. If it is a question of ordinary marks, then the casting of a stone can be carried out 1200 times a minimum. If the best materials were used in the production process of the mold, and the requirements for composing the mixture were met, the mold will be ready to withstand up to 4000 castings. This is also true for the case when the form was confirmed by vacuum treatment, and was also used for pouring not very abrasive, aggressive and adhesive materials.
Having become acquainted with the assortment of the international market, you will be able to understand that polyurethane today is represented by several brands, among them:
If you prefer Russian brands, thenshould choose SIC-PU 5, SKU-PFL-100. They are made of polyester domestic production, and the quality is no worse than foreign analogues. Moreover, by some parameters they are leading.
The polyurethane grades differ in chemical composition,the number of urethane groups, the construction of a polymer chain, and the molecular weight of the material. Properties can be regulated by careful selection of raw materials. As a result, it is possible to obtain branched and cast chains of polymers.
Two-component polyurethane for molds can be supplemented with different substances, namely:
They are necessary to improve the quality of the composition.For example, modifiers are used to speed up the reaction, which are added to small items. As for the pigments, they are able to change the appearance of the element by the method of color correction. In order to reduce the content of plastic, fillers are used, which also make the products cheaper.
Fillers can be:
However, this list is not complete.Polyurethane forms for a stone have color shades from light yellow to brown. If you use special additives, you can get almost any color.
Polyurethane today found its use almostin all areas of industry. Used material also in everyday life. One of the promising areas is liquid two-component polyurethane. Its use has simplified and accelerated the work on the casting of concrete and plaster. With the help of polyurethane it became possible to produce small architectural forms, paving slabs and decorative elements, even at home.
