NL8203856A - SURFACE COATING MATERIAL. - Google Patents

Description

p? ......: · "a '-'--" ··· ίϊ ^ * 823194 / vdV / kd

Short designation: Surface coating material.

The invention relates to surface coating materials in the form of flexible laminates, in particular for pipe insulation.

Tubes are insulated for the transmission of u / arm, cold and sound, for example by using mineral wool, rock wool, glass wool or kieselguhr. The insulating material M / is either "loose" and temporarily attached to the pipe or preformed sleeves in the form of straight profiles or arcs are used. Both options require some type of surface coating material which serves in part for the final bonding of the insulation on the pipe and partly to provide certain properties to the entire device. It is important that the surface coating material has properties such as high fire resistance, low smoke ignition, resistance to changes in climate, diffusion density, etc.

To date, no surface coating material has been proposed which is capable of providing the best properties of the surface coating as such - at least at an acceptable cost - or of the entire pipe insulation. PPGs have been undertaken to meet the requirements of using aluminum and PVC laminates or using PVC films. For environmental reasons, however, polyvinyl chloride has the serious drawback of developing corrosive hydrochloric acid and chlorine gas on burning. Firstly, the PVC-based surface coating material is not fire-resistant, and secondly, such material is particularly environmentally friendly in the event of accidents that may occur.

Other attempts to provide surface coating materials include material combinations based on laminated paper fibers, which optionally also contain aluminum. However, such material combinations do not meet the high fire-resistant requirements.

The present invention aims to overcome the problems of the known coating materials and to provide a material 8203856-2 which, from a technical and economic point of view, meets the requirements that can currently be imposed on the materials of the current type.

The invention therefore provides a surface coating material in the form of a flexible laminate, in particular for insulating a tube consisting of a substrate and a surface layer of preferably diffusion-tight material, for example metal foil. The characteristic feature of the material is that the substrate consists of a polyolefin base layer containing an inorganic filler.

Since the filler content is preferably high, up to about 60 wt.%, Preferably 40 wt.%, Such a material provides the material properties desired in the present context, both from the viewpoint of mechanical resistance and fire resistance.

The inorganic filler consists, for example, of lime, slaked lime, kaolin or other material or a combination of materials with similar properties.

The thickness of the substrate is from 100 to 700 microns, preferably about 300 microns, advantageously the substrate is laminated on a surface layer of aluminum with a thickness of 10 to 70 microns, preferably 40 microns.

To facilitate mounting of the surface coating material on the tube, the layers of the laminate are preferably prestressed to obtain a curling effect in the machining direction. The laminate preferably has a tensile strength in the longitudinal direction, as well as in the transverse direction of at least 100 N, a modulus of ο 30. at least 150 N / mm, in both longitudinal and transverse directions, and a tear strength of at least 50 N.

In a preferred embodiment, the substrate layer consists of polypropylene with a lime filler content of 40% by weight.

Since the manufacture of the new laminate according to the present invention is carried out using known lamination techniques in known types of laminators, it is unnecessary to have a 8203856 "ν" ': - ^: - ^ ^ - -

* I

- 3 - provide a description of the correct manufacturing process. However, it can be mentioned that the tension of the different fibers to be laminated is variable to obtain a suitable curling effect in the direction of processing. The metal foil, which is preferably an aluminum foil, forms the k 3Π surface layer of the coating. material and are laminated with a lacquer to provide maximum flame protection.

Otherwise, the primary task of the aluminum is to form a diffusion barrier and minimize radiation losses.

The substrate imparts mechanical properties to the laminate, so that the laminate also meets the requirements for high burnability and low smoke release. For the rest, the substrate containing the filler during the lamination test is as commercially available as geu / one, "pristine" flexible fibers of polypropylene, polyethylene, PVC, etc.

VOQR IMAGE

A surface coating material is prepared from a 300 micron thick polypropylene film with lime filler in the amount of 40 µg / ml and a 40 micron thick aluminum film using a laminator with control of the individual fiber tension and otherwise the well-known facilities.

The following properties are determined from a sample of the surface coating material.

Density 1.41 g / cm3

Surface data 501 g / m2 ^ Tensile strength

in the longitudinal direction 140 N.

transverse 122 N.

Elongation at break in longitudinal direction 11.1% 35 du / ars 7.1%

Longitudinal modulus 180 N / mm2 d \ i / ars 242 N / mm2 8203856 - 4 -

Tear strength

longitudinally 111 N.

transverse 76 N.

Water vapor penetration 0: g / m2

5 25 ° C / 75% RH

The surface coating material was affixed to mineral wo1 insulation and a fire test according to "Nordtest" fire test method 4 (SIS 02 38 23) was performed by "Statens Provningsanstalt" (Official Swedish Research Institute).

The material passed the test for surface layers class 1 according to SBN 80 (Swedish building construction standard).

Although only βέη practical embodiment has been given, it is to be appreciated that modifications and alternatives are possible and are intended to be within the scope of the invention.

8203856

Claims (6)

1. Surface coating material in the form of a flexible laminate, in particular / bVu ° insulation, consisting of a substrate and a surface layer of a diffusion-tight material, for example a metal foil, characterized in that the substrate consists of a polyolefin base layer containing an inorganic filler in an amount up to about 60% by weight, preferably 40% by weight Si. 2. Coating material according to claim 1, characterized in that the filler consists of lime, slaked lime, kaolin or other material or combination of materials with similar properties. Coating material according to claim 2, characterized in that the substrate has a thickness of 100 - 700 microns, preferably about 300 microns, and the substrate is laminated on a surface layer of aluminum with a thickness of 10 - 70 microns, at preferably 40 microns. 4. Coating according to claim 3, characterized in that the layers are laminated with a predetermined bias to provide the so-called curling action in the machining direction. Coating material according to one or more of the preceding claims, characterized in that the laminate has a tensile strength in the longitudinal direction, as well as in the transverse direction, of at least 150 N / mm 2 and a tear strength of at least 50 N. Coating material according to one or more of the preceding claims, characterized in that the substrate consists of polypropylene with a lime filler in an amount of up to 40%. 8203856