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Polyurethane foam systems

Polyurethane foam is a modern high-tech material. Polyurethane foam - refers to a group of light, but strong enough foam of polyurethane, has a very low thermal conductivity (0.019 - 0.03 W / (m · K)), low water vapor permeability and high adhesion to almost everything - to paper, metal, wood, plaster , roofing felt. Due to its largely universal properties of polyurethane foams are commonplace in almost all spheres of human activity.

 

 Areas of application

  • Heat and cold insulation of industrial, household, commercial refrigerators, refrigerated vans and cameras.
  • Thermal insulation of roofs, facades, walls, floors, roofs, basements, residential and industrial buildings, the outer and inner insulation of window and door openings, sealing seams interpanel.
  • Preparation of pre-insulated pipes on a "pipe in pipe" or "tube-shaped".
  • Production of shells for pipe insulation.
  • Production of sandwich panels and plates for the insulation of buildings and structures.
  • Production of decorative elements.

 

 Types of Polyurethane Foam

Components for polyurethane foam - are chemical reagents from yellow to brown color. Systems for the production of polyurethane foam composed mainly of two components: a polyol component (Component A) and the isocyanate component (Component B). Can be supplied with a third component - a catalyst which is introduced into the component A in a certain proportion and mixed with it.

Systems for Rigid Polyurethane Foam

Designed for work on heat and cold insulation of industrial, domestic, commercial refrigerators, freezers vans and cameras; insulation of roofs, facades, walls, floors, roofs, basements, residential and industrial buildings, the outer and inner insulation of windows and doorways, sealing seams interpanel; for the manufacture of sandwich panels and slabs for thermal insulation of buildings, shells for pipe insulation, insulated pipes on a "pipe in pipe" or "tube-shaped" building graters, hives made ​​of polyurethane foam, decorative elements.

Systems for Flexible Polyurethane Foam

Intended for the production of seats, backrests, headrests, for the production of moldings used as an energy absorbing interior parts of vehicles (instrument panels, overlays on the rack and the door) car visors, seals air automotive filter, steering wheels, armrests, bicycle seats, for the production of furniture foam and orthopedic products.

 

 Technology of Polyurethane Foam production

The process of producing polyurethane foam consists of the following steps: preparation of the starting mixtures, mixing them together, pouring the reactive composition into a mold or spraying onto the prepared surface.

Spraying Technology

Spray polyurethane foam is the best way to heat insulation of residential and industrial buildings, tanks, large diameter pipelines. Spray polyurethane foam does not require any installation, because it has high rates of adhesion to all surfaces: metal, wood, plaster, brick, roofing, shingles, and many others, except oily surface. The lowest coefficient of thermal conductivity saving on the thickness of the insulation layer. In the production of polyurethane foam is formed by spraying seamless insulation, which excludes the presence of thermal bridges and moisture on the insulated surface. The very process of spraying polyurethane foam used with the special equipment for spraying, in which the mixing of the components, and supply under the influence of air pressure on the insulated surface.
 

Pouring Technology

Polyurethane foam production takes place by pouring a polyurethane foam by mixing the components and supplying a prepared mold cavity or without pressure. This method allows to produce insulating sandwich panels, polyurethane shell for pipes, decorative elements. All moldings are made of polyurethane foam by pouring into molds.
 

 Parametres considered in the processing of polyurethane foam systems

  • ambient temperature, mold temperature, the temperature of the coated surface.
  • proportions of the components in the processing - the ratio of "A" and "B", which is set according to the prescribed ratio for specific polyurethane systems;
  • period gel system - the period of time from mixing until a gel state transition;
  • boot time - the period of time from mixing until foaming;
  • rise time of the system - the time period for which the mixed components are increased in volume;
  • density of the final product.

 

 Equipment

 

Equipment for spraying

For spraying polyurethane foam used installation, allowing dosing components in the correct proportions. At deposition equipment has a mixing chamber in which there is intense mixing of the components. In a spray gun of such equipment is ejected from the nozzle of the obtained emulsion under pressure of compressed air. For ease of operation the equipment is supplied with continuously variable performance, so you can choose the intensity of the mode of application of insulation to the surface. To work in the cold season, the equipment used, which provides automatic heating components to the desired temperature.
 

Equipment for filling

The filling equipment for the production of polyurethane foam offers extra performance. This is justified by the need for the production of moldings of large volume. For the convenience of foaming machines are equipped with a timer fills. This device keeps track of time feeding the right amount of raw materials in the form below and automatically turns off. Timer time filling in the production of polyurethane foam allows very precise dosage of raw materials, avoiding marriage products because of the "underfill" the required number of components, or vice versa "overflow."

In the production of molded rigid polyurethane foam used special foam molds.

Additional equipment can be combined to meet the installation foam, allowing engaged in the production PPU as a method of pouring or spraying.

 

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