FI73704C - UTBLAOSTBAR CELLULOSAISOLERINGSMATERIAL SOM ANVAENDS SOM VAERMEISOLERINGSMEDEL. - Google Patents

Description

73704

The present invention relates to the production of a thermal insulation material, in particular an inflatable thermal insulation material, in particular to an inflatable thermal insulation material, in particular an inflatable thermal insulation material.

Many different inflatable 1 ärn bead materials are previously known. For example, mineral wool is also used as inflatable bulk grain from which binders have been omitted, or as torn wool. In addition, cellular generation is also used. It is further known to use urea-formaldehyde foam, for example, to repair the thermal insulation of old wooden buildings. All the above mentioned knee-15 rhenium, polyurethane and foam insulation are based on the use of petroleum, which is an imported product and should therefore be avoided.

Also known as. cellulose, i.e. sei 1 ui oo-2 C insulator, which is made from newsprint by grinding, during the grinding of which chemicals are added to the product mainly as a preservative and to improve the fire technical properties. Hitherto, boric acid and sodium tetraborate (borax) have been added to the cellulose wool, which inhibit the growth of these fungi in somewhat moist insulation. The moisture content of pulp wool depends on the humidity of the surrounding space. It has been found that still about 20% moisture does not affect the pulp. an thermal insulation ability. However, the use of particularly hygroscopic substances as additives should be avoided, as the excess wetting of the cellulose wool is likely to weaken the thermal insulation over time, increasing the specific gravity of the insulation and thus causing it to compress.

35 However, the additives of currently used pulp wool, boric acid and boron, are not capable, at reasonable concentrations, of preventing the so-called flame fire, which * is a particularly unpleasant disadvantage in this type of insulation solution. Today, the combined concentration of boric acid and borax is about 20% of the dry weight of the product. Said 20% proportion is distributed in such a way that the proportion of boric acid is 2/3 to 1/3 and that of borax 1/3 to 2/3 of the total amount. If it were desired to completely remove the fire from 11 uvi11 using boron compounds, they would have to be increased to almost 30% of the dry weight of the product, increasing the weight and density of the finished product, reducing the wool and increasing the cost of insulation and the same thermal insulation. In addition, a small but still significant disadvantage is the foreign nature of boron compounds, as their countries of origin are Turkey and China, although the Soviet Union and France may also be importing countries.

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Also known is urea diammonium phosphate, (NHo) CO · tl L ·.

(NH4) 2HPO4, used as a flame retardant, but it is most commonly used in textiles where its hygroscopicity does not dampen. temperatures. Thus, its fire protection effect would diminish over time. On the other hand, urea-diammonium-25 phosphate is hygroscopic, whereby the pulp wool would accumulate moisture, increase the density, thin the layer thickness and decrease the thermal insulation capacity. It must therefore be concluded that urea diammonium phosphate is not suitable as an additive for pulp wool for the reasons mentioned above.

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Thus, in order to prevent tidal fire, to reduce the price of the product and to achieve a greater degree of domestication without the use of hygroscopic additives, it has been decided to use urea phosphate NH CONH 2 as an additive for cellulose wool.

2 2 35 H3PO4, a domestic chemical. In this case, the foreign share is only about 5% borax, with which

II

• 3 7 3 70 4 are asked to prevent the growth of fungi in the insulation.

The above-mentioned urea phosphate requires a lot of heat in order to decompose, whereby it evaporates only in the event of a fire, 5 having a deterrent effect on the continuation of the fire and preventing the ignition fire at a concentration of about 10% by dry weight. Combustion of the insulation can be prevented at a concentration of about 5% and up to concentrations of 30% the use of urea phosphate can be justified. In addition, the use of urea phosphate 10 prevents rusting of nails and other metals, since the phosphating layer formed on the metals protects them from corrosion.

The pulp according to the invention is otherwise prepared in a conventional manner, except that the addition chemical, urea phosphate, is added by spraying either during or shortly after grinding, whereas the boron compounds were most commonly added in powder form. Thus, it can be stated that the chemical feed form according to the invention promotes the uniformity of the insulation, whereby the quality of the insulation is improved in this respect as well. The required amount of borax1 is added as before in powder form during grinding, whereby the purpose of borax is to prevent the formation of fungal growth in the sediment layer. It is most advantageous to feed the urea phosphate during grinding, as a slight wetting of the pulp wool prevents dusting and at the same time cools the mill.

Thus, in the manner described above, a heat insulation material with an almost complete degree of domestication has been obtained, in which the thermal conductivity and permeability of the internal insulation is lower than with another domestic insulating material, mineral wool. (VTT Bulletin 210, Repair of thermal insulation with inflatable and sprayable insulators. Espoo 1983).