CS229450B1 - Non-combustible insulation board and method of production - Google Patents

Abstract

The non-combustible insulating board consists of inorganic aluminosilicate fibers and a binder. The essence of the solution is that the binder is a silicic acid salt modified with a silanolate of alkali metals or alkaline earth metals.

Description

229450 2

BACKGROUND OF THE INVENTION The present invention relates to a non-flammable insulation dock and a method for its production by a modified papermaking technique in two production stages using a liquid inorganic binder.

The insulation board currently produced by a single-stage modified paper mill from mineral wastes, asbestos, ceramic fillers, inorganic binder under the power-efficient chemical agents does not meet the criteria of the versatile use of the fire protection wall. This method of production is because of the low solids content of the slurry! (1 to 3 wt.%) Requires a binder Specific properties that are trapped in the filter cake in the first stage of the process and the subsequent heat treatment will form a binder film on the fiber glass.

Such binders are starch oils. The advantage of using starch in this technology is that even with a high dilution of starch grains (10-100 µm), the solid components of the composition are captured, thereby ensuring a sufficient weight fraction of the binder (starch) in the insulating board (7-10% wt. .) The use of a liquid binder does not provide the necessary binder in the insulating board. Starch is a preferred binder from the molding site, but less preferred from the point of view of the final insulating thatch. It restricts the use of these boards to a temperature of 136 ° C and pre-flood protection is not sufficient. From the point of view of flammability, these materials are referred to as "difficult" flammable and according to ČSN 73 0853 they are in category B to C-1. The flammability of insulation boards of the intended type is achieved in a known manner using inorganic binders such as colloidal SiOg and / or AlgOj (hydrosols). The introduction of the conjunctival system is carried out either in an aqueous solids dispersion or in a formed wet board - felt.

The SiOg hydrosol in aqueous dispersions is transformed into SiOg gel, most often by electrolytes (e.g., aluminum sulfate). On filtration, the SiOg gel is retained on the other solid components of the composition, on mineral fibers and ceramic fillers. The bonding properties of the gels thus formed are poor, since the high water content (gel formation at low SiO2 concentration in the aqueous dispersion) does not result in significant shrinkage and cracking of the binder during drying. In order to achieve the desired material strength, a high binder content in some cases is above 20 wt%. SiOg.

In the production of mineral fiber insulation boards, due to the price relations, the SiO2 binder content in the slab cannot exceed 10% by weight.

In the second method of introducing SiOg into the wet thatch system, they are poured, infused with SiOg alone. In this case, electrolytes cannot be present in the wet plate because they would prevent binding of the thatch with binder and precipitate the hydrosol in the upper layer of thatch.

The aforementioned drawbacks are eliminated by the non-flammable insulating board according to the invention and its production method, the principle being that the board consists of inorganic fibers, aluminosilicates and a binder, characterized in that the binder consists of a silicic acid sol of 2 to 8% by weight. and alkali metal silanolate; % of alkaline earth metals in an amount of 0.2 to 1.1 wt. to the weight of thatch. The method for producing a non-combustible insulating wall formed by the modified paper technology is characterized in that the partially dewatered board is impregnated with an aqueous binder solution having a concentration of 10 to 35% by weight, the continuous shaping process is compressed and dried at 130 to 300 ° C.

Modifying the SiOg hydrosol with sodium silanolate provides a more fluid transition of sol to gel in the wet system. As a result, the gel is formed at higher concentrations of SiO 2 and therefore with less water. The water-less gel is less shrinking, more compact after drying, and thus exhibits better bonding properties. The insulation board obtained is more compact and has higher strength. 3 229450

By modifying the hydrosol of SiO2, the strength of the insulating material is increased, which makes it possible to reduce the binder content to 8% by weight. SiOg to the dry weight of thatch. The advantage of the non-flammable insulation dock according to the invention is the non-flammability, the possibility of using a temperature of 900 ° C with the use of mineral fibers. to higher temperatures depending on the used refractory fibers, which ensures high fire protection in its structural applications.

In addition to the abovementioned advantages of the non-combustible insulating boards produced according to the invention, the good mechanical properties of the category of semi-structural materials, increased resistance to the action of microorganisms, low bulk density, volume stability are very good thermal insulation properties. An advantage of the process of the invention is that the inorganic binder used is continuously dispensed in defined amounts into the production process depending on the production rate, and its use is quantitative without adversely affecting production equipment, working environment and ecology. Example t

The non-combustible mineral wool insulation board is prepared from an aqueous suspension consisting of: 14 wt. parts of halloyite 2 wt. parts of bentonite 000 wt. parts of water which are partially dewatered to a water content of 60% wt. and impregnates 10 parts by weight of a modified silicic acid composition (wt%)

SiO, 14.7 sodium silanolate 2.0 Na2O 0.2 water 83.1

After impregnating the insulating floor with the binder, it is pressed and the temperature is dried to 150 ° C.

Properties of non-flammable insulation dock permanent use up to 900 ° C bulk density 400 kg / m 'thermal conductivity 0.06 Wm "flammability according to ČSN 73 0853 A category with weight loss of 0.7%, bending strength 1.1 MPa Example 2

The non-combustible rock fiber-based insulation board is prepared from an aqueous suspension consisting of: 80 wt. dielov14 hm. parts of rock fiber refractory clays

Claims (2)

229450 4 by dewatering to a water content of 50% wt. The crude board formed, consisting of the suspension components, impregnates (in wt.%) SiO2 with 20% zinc silanolate 3.0Na2 O 0.20 76.8 in an inorganic binder so that its content in the finished plate is 5% by weight. The molded board after pressing and drying at 180 ° C has the following properties: density 350 kg / m / »thermal conductivity 0.055 Wm-'K- 'flammability according to CSN 73 0853 category A with weight loss 0.5% These non-flammable insulating materials thatch is used for heat cladding of structures and protective steel structures against thermal stress in case of fire, protective soundproofing, fire protection cladding of air-conditioning and ventilating equipment in residential, civil and industrial construction, for insulation of industrial furnace constructions as well as for heating equipment. SUBJECT OF THE INVENTION What is claimed is: 1. A non-combustible insulating board consisting of an inorganic fiber, alumosilicates and a binder, characterized in that the binder is a silicic acid sol in an amount of 2 to 8% by weight. and alkali metal or alkaline earth metal silanolate in an amount of 0.2 to 1.1% by weight. to the total weight of thatch. 2. A method for producing a non-flammable insulation dock according to claim 1, modified by paper technology and partial dewatering, characterized in that the formed board is compressed and impregnated with an impregnated solution of silicic acid and sodium silanolate in a concentration of 10 to 35% by weight. drying at 130 to 300 ° C. Severografia, n. P., MOST Price 2,40 Kcs