CS199774B1 - Method of manufacturing cooling plants - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing flanging devices using polyurethane foams as heat insulating material for cavity filling.

The very good thermal insulating properties of the polyurethane diapers have, in fact, displaced materials having these properties for the manufacture of tiling equipment. In addition to the great advantages of use, it is sufficient from the viewpoint of technological progress that the adhesion properties of polyurethane diapers to the surface of construction materials, possibly even after post-treatment, substantially eliminate the removal of flow without damaging the surface or greatly increase labor and cost. Initially, the use of non-rectifiable types of substances, so-called "separators", appeared to be a great promising process, but in practice some negative properties, such as the need to use toxic solvents such as halogenated hydrocarbons, solvents classified as flammable and / or of the separator due to the chemical effects of shifting the polyurethane mixture onto the separator, possibly the opposite.

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The method of application was also unsatisfactory and in particular there was a problem that, when using a thin layer of separating agent, the effect was inadequate, while the use of a thicker layer of sapping agent increased the requirements, in particular for labor, while removing it.

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According to the present invention, a system is applied to the areas potentially affected by the excess extruded polyurethane material, prior to the extrusion or in the initial phase of foaming, a system of up to 4.8 is applied. 5.1 parts by weight of at least one higher C12-22 fatty acid;

1.7 to 1.9 parts by weight of a aromatic acid with a carboxyl group directly bound to the core,

3.2 to 3.4 parts by weight of 3-axis ± -3-aluminum iso-propoxide,

90.3 to 92.2 parts by weight of a mineral oil having a viscosity of 60 to 90 MPa.s at 30 ° C with a flash point of 150 to 200 ° C, preferably 180 to 187 ° C, in an amount of 50 to 200 g.m -1.

One component of the colloidal system is at least one higher C12-22 fatty acid. However, mixtures of acids, in particular etearic acid and palmitic acid, or other technical mixtures commercially available on the market are preferred, and mixtures containing unsaturated bonds in the chain may also be used.

Acids obtained from the biological process or from technical raw materials, obtained in the processing of crude oil or its products, may be used for this purpose. Mixtures or individual acids having from 12 to 18 carbon atoms are preferred.

The aromatic acids used are also technically available. The most preferred use of aromatic acids with one functional group, namely with benzoic acid ·

It is also possible to combine acids, such as • benzoic acid with β-dicarboxylic acids ·

For the mineral oil used, it is important that the spinal requirements for physical properties, in particular viscosity and flash point, ensure both the technical properties of the separator and the safety aspects taken into account.

The coating may be carried out by any technique, and it is apparent from the preceding figures that the deposition of the release agents in a relatively thin layer has proved to be sufficiently effective.

The release agent can also be applied after the foamed material has been introduced into the cavities, but must be so before the final foaming phase.

An advantage of the process according to the invention is that the applied system perfectly separates the polyurethane foam from the surface on which the system is applied, the effect being achieved even with very thin layers which allow its removal after removal of unwanted polyurethane foam by mechanical action by applying a very thin layer and the system components are available, which also increases production efficiency. Naviao also has to be positively evaluated by the fact that it reduces the confusion due to damage to the coating and substantially improves work safety conditions.

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Example 1

In the manufacture of the trowels before filling the hollow spaces, a system consisting of 4.8 wt. parts by weight of at least one high C12-C22 fatty acid, 1.7 parts by weight of benzoic acid, 5.2 parts by weight of 5-oxi-J-aluminum isopropoxide, and 90.3 parts by weight of mineral oil in thickness 80 to 10 µm «After application, the starting mixture for the polyurethane mass is applied in the recalculated amount to fill the space with a small excess · 7 due to leakage of gravel and the molds leak onto the surface irregular polyurethane foam formations the surface of the cabinet and the door and the release agent is rubbed off with a cotton wool poppy. The lusual surface control shows no defects or scratches, gloss reduction, color change and the like.

Example 2

In the manufacture of the refrigerator door, the molding part of the mold is coated with a 7% alcoholic solution of the system consisting of said composition in an amount which, after evaporation of the solvent, forms a layer having a thickness of 40 to 60 µm. After the injection molding composition for polyurethane foam has been injected, foaming and stabilizing, the formed door is removed from the mold. The lysical control confirms a homogeneous surface gloss that indicates the desired olei closures, with the residual release agent layer being in the door amount not requiring special cleaning agents.

Claims (3)

A method for producing smoothing equipment, in particular smoothers and freezers, and a thermally insulating polyurethane filler, characterized in that a system consisting of a pre-foaming or an early foaming phase is applied to the areas potentially affected by excess polyurethane extrusion. 4.8 to 5.1 wt. parts of at least one high fatty acid having 12 to 22 carbon atoms, 1.7 to 1.9 wt. parts of aromatic acid with a carboxyl group directly bound to the core, 5.2 to 5.4 wt. parts of J-oxi-J-aluminlum-lzo-propoxléli, 90.5 to 92 * 2 wt. parts of mineral oil having a viscosity of 60 to 90 mPa · s at 50 ° C with a flash point of 150 to 200 ° C in an amount of 50 to 200 g.m · ^ ·