CS240885B1 - Method of manufacturing heat-insulating panels - Google Patents

Abstract

A method of manufacturing thermal insulation panels on a metal-plastic basis aimed at improving the separation of the molds from the thermal insulation filling of the panels. To improve the separation, a mixture of aliphatic carboxylic acid derivatives is used, which is applied to the surfaces of the metal mold coming into contact with the filling material in the form of an aqueous solution.

Description

The invention relates to a process for the production of heat-insulating panels on a metalloplastic basis.

In the current production of metal-based thermo-insulating panels, ee has been using petroleum-based release agents, but not satisfactory in all cases, on mold sidewalls in contact with the foaming material.

Due to the higher reaction temperatures during foaming of some insulating materials (up to 1050C) and the necessity of tempering the mold sides, the existing release agents (based on petroleum products) are absorbed into the foaming material and the separation effect is lost.

The hitherto proposed and proven release agent, liquid foil (1.6-25% solution of plasticized polyvinyl chloride foil in tetrahydrofuran) is not hygienic, because the operator is disturbed by fumes of tetrahydrofuran when applied to the sidewalls.

□ other release agents that have been tested, eg methylsil icon polymer (M 123), polyvinyl alcohol solution in ethanol water (Sloviol R), polytetrafluoroethylene (Teflon) did not give results that are usable for mass production of panels and are not particularly suitable in these respects; higher cost, high labor, low lifetime and large amount of harmful fumes.

All of these disadvantages are overcome by a new method of manufacturing heat-insulating panels on a metal-plastic base, in which a molding composition characterized in that it consists of an aqueous solution of a mixture of esters is applied to the mold parts coming into contact with the heat-insulating panel filler before the mold is filled with the heat-insulating material. aliphatic carboxylic acids having a carbon number of 8 - 22 with sucrose, mono- and diglycerides of aliphatic carboxylic acids having a carbon number

- 2 240 885 8-22 atoms and alkali salts of carboxylic acids with 8-22 carbon atoms in a weight ratio of 0.5 - 1.0: 0.6 - 0.8: 0.02 - 0.2 in total 0 , 05 - 0,5 kg 100% active substances per 1 m of treated mold area.

The main advantages of the aeparation process according to the invention are that the separation mixture does not have corrosive effects on the metal molds. By perfectly ensuring separation of the foaming material from the metal mold and at the same time it prevents the penetration of moisture into the foaming material. The mixture used is non-toxic and its production can be realized in the Czech Republic.

The production method of the thermal insulating panels according to the invention is illustrated in more detail in the following five examples, which are not to be construed as limiting the invention.

Examples

Example 1

A metalloplastic panel with a polystyrene foam insulating part in combination with a phenol-formaldehyde resol resin foaming material under the trade name Sibafen.

Before inserting the metal-plastic panel blank (sheet metal and foamed polystyrene plate fixed with spacer profiles) into the mold, apply a brush or a spray gun to the cleaned surfaces of the metal mold that comes in direct contact with β foamed phenol-formaldehyde resin. An aqueous 60% by weight solution of the mixture containing 40 parts by weight of coconut fat ester with sucrose, 40 parts by weight of coconut fat mono diglycerides, 15 parts by weight of potassium soap of 8-16 carboxylic acids in the chain and 5 parts by weight of unreacted feedstock.

After drying, the mold is filled with Sibafen. This creates a sandwich panel where the surfaces of Sibafen (not covered by a sheet metal sheath) are protected from moisture and the panel can be easily removed from the mold.

Example 2 240 885

Metal-plastic panel β heat-insulating foam polystyrene part in combination with rigid polyurethane foam ·

The procedure is the same as in Example 1 except that the Sibafen mass is replaced by a rigid polyurethane foam.

40 40 parts by weight of an aqueous solution containing 30 parts by weight of tallow aliphatic carboxylic acid esters with sucrose, 35 parts by weight of tallow mono- and diglycerides, 20 parts by weight of potassium salts of carboxylic acid and 15 parts by weight of unreacted are used as a separating mass. starting materials including catalyst. This procedure creates a panel that can be easily removed from the mold and its exposed walls are protected from moisture.

Example 3

Metal-plated panel with heat-insulating part made of rigid polyurethane foam only.

Before the sheet metal casing is placed in the mold, an aqueous 70% by weight solution containing 60 parts by weight of oleic acid esters of sucrose, 25 parts by weight of mono-mono-esters, is applied to the cleaned surfaces of the metal mold which comes into direct contact with the rigid polyurethane foam. and tallow diglycerides, 10 parts by weight of potassium oleic acid potassium salt and 15 parts by weight of unreacted fatty acids.

After drying, the mold is foamed with rigid polyurethane foam. This creates a sandwich panel where the rigid polyurethane foam surfaces (not covered by the sheet metal sheath) are protected from moisture and the panel can be easily removed from the mold.

Example 4

Metal-panel panel with thermal insulation part made of foamed polyvinyl chloride.

- 4 240 885

Before inserting the sheet metal sheaths into the cleaned surfaces of the metal mold coming into direct contact with β rigid polyvinyl chloride-based foam, an aqueous solution containing 40 parts by weight of sucrose esters of 16-18 carbons with sucrose is added by brush or spray gun. parts by weight of mono- and diglycerides of 16-18 carbons in the chain, 10 parts by weight of potassium salt of 16-18 carbons in the chain, and 15 parts by weight of unreacted identical fatty acids.

After drying, the mold is foamed on the basis of polyvinyl chloride. This creates a sandwich panel where the rigid polyvinyl chloride foam fruits (not covered by a sheet metal sheath) are protected from moisture and the panel can be easily removed from the mold.

Example 5

Metalloplasmic panel with thermal insulation part made of polystyrene foam only.

The procedure is the same as in Example 3 except that the polyurethane foam is replaced by polystyrene foam.

40 40 parts by weight of an aqueous solution containing 30 parts by weight of tallow aliphatic carboxylic acid esters with sucrose, 35 parts by weight of tallow mono- and diglycerides, 20 parts by weight of potassium salts of carboxylic acid and 15 parts by weight of unreacted starting materials raw materials including catalyst. This procedure creates a panel that can be easily removed from the mold and its exposed walls are protected from moisture.

Claims (1)

SUBJECT OF THE INVENTION 240 885 A process for the production of a metal-base heat-insulating panel, in which a molding composition is applied to the mold parts coming into contact with the thermal-insulating panel filler before the mold is filled with the thermal-insulating material. aqueous solution of a mixture of esters of aliphatic carboxylic acids of 8-22 carbon atoms with sucrose, mono- and diglycerides of aliphatic carboxylic acids of 8-22 carbon atoms and alkali salts of carboxylic acids of 8-22 carbon atoms in a weight ratio of 0.5 - 1.0: 0.6 - 0.8: 0.02 - 0.2 in a total amount of 0.05 - 0.5 kg of 100% active ingredient per 1 m @ 2 of mold surface treated.