SI8611943A8 - Process for making laminates from polyuretanic plates - Google Patents

Description

The present invention relates to the field of technological-chemical processing, specifically to a new process for the manufacture of laminates from soft foamed polyurethane sheets and fibreboards with a thickness of 0.1 to 20 mm and a fiber diameter of 0.1. up to 1 mm.

A technical problem

There are problems in making laminates from soft foamed polyurethane fibreboard containing abrasives with adhesives, because the contact adhesives used contain combustible solvents, which makes the work more difficult, less resistant to _L high temperatures and mechanical stress. they do not give the proper aesthetic appearance, since the materials on the glued surface often deviate.

The state of the art

Insulating materials made of polyurethane foam sheets bonded with fibrous tiles have become increasingly important lately, e.g. cleaning agents, such as household cleaning sponges.

In accordance with known methods, soft polyurethane foam has been bonded with a fibrous, foam plate. By applying a special adhesive container or a roller adhesive to a foam plate and a metal foil, e.g. type NEOPREN. When the solvent evaporated from the adhesive, the adhesive coated surfaces were combined under pressure.

However, this known bonding process has the following disadvantages:

The adhesive must be applied to both surfaces to be bonded. The contact adhesives used contain combustible solvents, which makes the work more difficult, and they are less resistant to the high temperatures and mechanical stresses' that the end products are exposed to. when washing the dishes manually in hot water.

Description of solution to a technical problem with implementation examples

We have now found that all the disadvantages of the known processes are avoided and that laminates made of soft foamed polyurethane sheets and fibreboards formed of polyester or polyamide fibers coated with blades can be produced in a technologically simple way if 15-100 kg per polyurethane plate is used. / m ³ and a thickness of 2 to 30 m, 50 to 300 g / m ^{2 of a} polyurethane system consisting of a polyester or a half-meter polyol mixed with isocyanate in a ratio of 1:10 to 10: 1 is then applied to a coated fibreboard with a thickness of 0.1 mm to 20. mm. The press is then pressed at a specific pressure of about 2 to 4 kPa to compress both layers, ie a sheet of soft polyurethane foam coated with polyurethane adhesive, and a fibrous plate. In practice, we streamline the process by compressing several such sandwich combinations at a time. The ratio of the polyester to the polyether component of the adhesive and the isocyanate must be chosen so that the system begins to react only after the pressing operation, so that the foil can be rested on the plate. This open time can be a few minutes to about 8 hours.

The compression time depends on the activation level of the system, and usually takes 5 minutes to 10 hours. .The whole process is carried out at ambient temperature, preferably at about 20 ° C.

The laminates manufactured according to the process of the invention are characterized by thermal and dimensional stability and extremely aesthetic \

appearance. s

The fibrous board is made up of fibers consisting of polyester or polyamide surrounded by a forming agent, which is usually aluminum oxide or silicon carbide.

The present invention is explained by the following example, which, however, is not to be construed as limiting. In describing the embodiment of the case, reference is made to the accompanying drawing, which shows in the figure a schematic sequence of individual laminate making devices.

Figure: The soft foam (1) is located on a trolley with dimensions of 2 mx 1 m, with a thickness of 10 to 25 mm and a specific mass of 15 to 60 kg / m ³ . Through the conveyor (2), run individual plates in succession into the device (3) for applying the polyurethane system.

The polyurethane system is prepared by mixing a polyester or polyether polyol with a stoichioraetric amount of isocyanate. E.g. 100 wt. parts of Desmophen 2300 type polyolpolyester (manufactured by Bayer) are mixed with 20 wt. parts of methandiphenyl isocyanate type isocyanate to homogeneity at 20 ° C. Pour the mixture between the cylinders (3) and apply 50 to 3θ0 g per m ^{2 of} foam.

The foam with the applied polyurethane system is then led through the trans porters.v (4) and (5) to the trolley (6), to which the foam with polyurethane coating is exchanged, and a fibrous plate with thickness of 0.1 to 20 mm coming from the reel (7). The trolley with loaded plates, aluminum foil and netting is then driven into the press (8). where a specific pressure of about 2 to 4 kPa is applied for about 8 hours. The trolley is designed to allow this specific pressure to be maintained by fixing the upper part (moving panels).

As the system of raw materials for joining foam plates and aluminum foils begins to react only after the plates have been pressed on the press (8), they are diodes. 8 hours in constant pressure load. The foam is thus subjected to constant compressive loading throughout the surface, so that it is insensitive to deformation resulting from work and transport.

Indication of the best known applicant for the economic exploitation of the object of the invention>

In describing the embodiment of the case, reference is made to the accompanying drawing, which shows a schematic sequence of the individual laminate making devices.

The soft foam (1) is placed on a trolley in the form of plates with dimensions of 2 mx 1 m, with a thickness of 10 to 25 mm and a specific mass of 15 to 60 kg / m ³ . Through the conveyor (2), run individual plates in succession into the device (3) for applying the polyurethane system.

The polyurethane system is prepared by mixing a polyester or polyethylene polyol with a stoichiometric amount of isocyanate. E.g. 100 parts by weight of Desmophen 2300 type polyolpolyester (manufactured by Bayer) are mixed with 20 parts by weight of methandiphenyl isocyanate-type isocyanate to homogeneity at 20 ° C. Pour the mixture between the cylinders (3) and apply 50 to 300 g of ra ² foam.

The foam with the applied polyurethane system is then led through the conveyors (4) and (5) to the trolley (6) to which it exchanges! Polyurethane-coated foam and fibreboard are loaded in succession! bar with thickness 0) 1 to 20 frames coming from the reel (7) · The trolley with loaded plates, aluminum foil and mesh is then pressed into the press \ (8) _f where a specific pressure of about 2 to 4 kPa is applied for about 8 hours. by allowing this specific pressure to be maintained by fixing the top of the moving plate. For

PLAMA Plastics Production and Processing Industry Podgrad n.sol.o .:

Claims (1)

4- PATENT APPLICATION Process for the production of laminates based on polyurethane sheets according to basic patent No. ...... (patent application) P-3146/80), in which 50 to 300 g / m ^{2 of a} polyurethane system consisting of polyester or polyether polyol is applied to a soft, foamed polyurethane plate having a specific mass of 50 to 100 kg / m ³ and a thickness of 2 mm to 30 mm mixed with isocyanate in a ratio of 10/1 to 1:10, then put another component of the laminate on the coated board and pressed for 5 minutes to 10 hours at a specific pressure of about 2 to about 4 kPa at temperatures. 3 characterized by the use of fibreboards of 0.1 to 20 mm thickness as the second component of the laminate, the fibers of which are made of polyester or polyamide surrounded by an abrasive agent such as aluminum oxide or silicon carbide and have a diameter of 0.1 to 1 mm. ¹ , For Plastics production and processing industry. x PLAMA Podgrad n.sol.o. 18541-ΧΙ-86-ΜΝ SUMMARY We propose a process for the production of laminates based on polyurethane sheets according to basic patent No. ...... (patent application) P-3146/80), in which a 50 'to 300 g / m ² polyester system consisting of a polyester system is applied to a soft, foamed polyurethane' plate having a specific mass of 50 to 100 kg / m ³ and a thickness of 2 mm to 30 mm or polyether polyol mixed with isocyanate in a ratio of 10/1 to 1:10, then put another component of the laminate on the coated board and pressed for 5 minutes to 10 hours at a specific pressure of about 2 to about 4 kPa at ambient temperature at which the angle the second component of the laminate is a fibreboard with a thickness of 0.1 to 20 mm, the fibers of which are made of polyester or polyamide surrounded by an abrasive agent such as aluminum oxide or silicon carbide and have a diameter of 0.1 to 1 mm. ». . Finished products are mainly used as cleaning agents, e.g. household cleaning sponges.