CS273365B1 - Method of heat insulating element production with stiff)ning and horizontal surface treatment - Google Patents

Abstract

The solution concerns the preparation method of the heat-insulating part of mineral felt with one-sided or double-sided stiffening and water-resistant surface treatment from thermoplastic mass that is stiff and water-resistant under common temperatures. The plate from mineral felt with the volume weight between 100 and 200 kg x m <-3> inserted for the duration of 3 to 60 seconds into melted thermoplastic mass with cinematic viscosity between 10 <-4> and 10 <-3> x m <2> x s <-1> so that the depth of immersion would amount to 2 to 15 mm, whereupon it is extracted and turned by 180 degrees about its horizontal axis and it is kept until stiffening of the stiffening layer in this position.

Description

SUMMARY OF THE INVENTION The present invention provides a method for producing mineral fiber insulating panels in the form of slabs having a stiffened and waterproof surface.

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Mineral felt insulating materials are widely used for thermal insulation of building structures. Their advantages are especially non-flammability, breathability, easy workability, low weight, thermal, chemical and biological stability, high insulation efficiency and raw material availability. In some applications, however, a requirement for adequate rigidity and water resistance of the surface is also required. Normally produced mineral wool insulating materials do not meet this requirement, therefore it is necessary to modify them in various ways already in production. A known and used method of surface hardening is first of all the hardening of the entire cross-section of a product by higher compaction of its fibrous structure. In order to achieve water resistance of the product surface, hydrophobization of the surface of the individual fibers is used, again over the entire cross-section of the product or the surface is provided with a continuous application of the waterproof material.

The disadvantages of the known methods for treating mineral felt products are, in particular, considerable laboriousness, reduced insulating capacity, high weight and, in the case of hydrophobization, only temporary effectiveness.

The above-mentioned disadvantages of the prior art are eliminated by the method for the production of the thermal insulation panels of the mineral felt according to the invention, which consists in that the solidification and water resistance of the conventional product is achieved by a single operation. layer layers. A molten thermoplastic mass having a viscosity of 10 ^-4 to 10 ^-3 m ^{2 is used} . ^s1 , which is rigid and waterproof at normal temperatures. In this bath, the workpiece is immersed for a short time to the desired depth, after which it is taken out, reversed around a horizontal axis by 180 DEG and left in this position until the thermoplastic material introduced solidifies. The immersion time and depth depends on the density of the fiber structure of the panel and on the desired stiffening thickness of its surface.

An advantage of the process for the production of the thermal insulation panels according to the invention is the possibility of using mineral felt of lower bulk density as a starting material, hence with a higher thermal insulation effect than hitherto. This is achieved by incorporating a continuous layer of reinforcing waterproofing material directly into the fibrous structure of the member, thereby forming its spatial reinforcement, increasing the surface resistance to the point stress under compression. Since the required waterproofing and stiffness results in a relatively low layer thickness of the thermoplastic material introduced, the reduction in the heat-insulating capacity of the product in practice is negligible. The process according to the invention furthermore eliminates the need for costly hydrophobization of the surface of the individual fibers constituting the structure of the article, since its surface is continuously watertight.

Example

A mineral felt plate, e.g., basalt, 150 kg / l, was immersed for 5 seconds in a molten oxidized asphalt bath having a softening point of 85 ° C, a temperature of 195 ° C, so that the immersion depth was 5 mm. After removal from the bath, the plate was immediately turned 180 ° about its horizontal axis and thus left for at least 20 seconds.

Example 2

Using the same procedure as in Example 1, a mineral wool slab of 120 kg.m ^{-3 was} immersed for 11 seconds in a bath of molten amorphous polypropylene 273365 B1 linen at 180 ° C to a depth of immersion of 8 mm. After removal from the bath, the plate was immediately turned 180 ° around its horizontal axis and thus left for at least 15 seconds.

Example 3

By the same procedure as in Examples 1 and 2, the board was already immersed in the same bath and its opposite surface with a one-sided layer of reinforcing waterproofing material.

In particular, the invention can be used in the manufacture of mineral wool thermal insulation products intended to be mounted in locations not exposed to the effects of the weather and exposed to mechanical contamination, such as roofing and cladding of buildings.

Claims (1)

Process for the production of a thermally insulating component consisting of a mineral felt and a thermoplastic, solid and waterproof material, e.g. . m-3 is placed in a molten thermoplastic mass having a kinematic viscosity of 10 ⁴ to 10 µm for 3 to 60 seconds. ¹ to a depth of 2 to 15 mm, then removed and rotated 180 ° about the horizontal axis and left in this position until the reinforcing layer solidifies.