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The method of obtaining filled with polyurethane foam for insulation products

The method of obtaining filled with polyurethane foam for insulation products
IPC classes for russian patent The method of obtaining filled with polyurethane foam for insulation products (RU 2123013):
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(57) Abstract:

The invention relates to the production of polyurethane foams with reduced Flammability and can be used for the manufacture of insulation products. The invention consists in that the polyurethane obtained from the reaction mixture containing the hydroxyl-containing component, targeted supplements (prestabilization, catalyst, foaming agent and other), the filler and the isocyanate component, by mixing them. First mix hydroxyl-containing component with the target additives and fillers. As the mixture is injected isocyanate component. The filler used sodium silicate with module up to 4 and a density of 1.3-1.5 g/cm3. As the isocyanate component used di - and polyisocyanates with a content of NCO-groups 29-33 wt.%. Liquid glass is used in the amount of 50-150 wt.h. (in terms of sodium silicate) is 100 wt.h. the amount of hydroxyl-containing component and an isocyanate component. Get polyurethane foam with density compression of 0.4-0.5, the temperature of 180-250oC, the fire on the burning time 2-4 C. table 2.

The invention relates to the production of polyurethane foams with reduced Flammability and morier in the production of multilayer tselnoformovannye details in the production of insulation materials in construction, refrigeration, aviation technique.

A known method of producing polyurethane foam by reacting polyol as one component and the target additives (component A) and diisocyanate (component B), wherein the foaming is carried out with the use of free nitrogen (N2) released during the interaction of substances containing ions NH+4and NO-2in particular, when the interaction of solutions of NH4Cl and NaNO2that is injected into the component mixtures containing polyols with targeted supplements (EN 2098434, C 08 J 9/10, 1990).

Data in a known manner to receive polyurethane, do not possess the necessary thermal insulation and fire resistant properties.

A method of obtaining polyurethane foam for insulation products destination by mixing the hydroxyl-containing component polyol P-7, P-509-based adipic acid, tall oil and triethanolamine; lupranol 294 - N, N, N', N' - tetrahydroxyphenylchlorin) with the polyisocyanate component in the presence of special additives (blowing agent, silicone prestabilization) and oligoamine complex ethoxylated urea and the tan (PUF) with heat VIKA 105-208oC. in a Known manner to receive polyurethane foam with insufficient heat resistance and non-resistance.

A method of obtaining a flame-retardant flexible polyurethane foam by the reaction of polyol and MDI in the presence of intumescent graphite, pre-mixed with melamine, and special additives such as miniawy activator, prestabilization, water (EN 2040531, C 08 G 18/40, 1995).

The method is complicated due to the necessity of preparing a preliminary mixture of graphite with melamine and does not provide the necessary thermal insulation and strength properties.

A method of obtaining polyurethane foam for insulating fire-resistant material by reacting polyol as one component of a simple polyetherpolyols mol. mass 350-820 and special additives (silicone prestabilization, water, halon) with polyisocyanate and dimethyl ester of methylphosphonic acid (RU 2050375, 1995). The method is not without disadvantages, in particular there is provided the use of ozone - depleting components halocarbons, i.e. not related to organic production.

The closest in technical essence and the achieved result is Izvestia hydroxyl-containing component with an isocyanate component in the presence of special additives and inorganic filler (SU, 593671, 1978). The known method is provided for use as the inorganic filler, water suspensions, various insoluble or sparingly soluble in water, inorganic compounds, including silicates. The content of the filler in the foam does not exceed 85 %. The content of NCO groups in the isocyanate component is 20-32 wt.%. Get filled with the polyurethane foam does not have sufficient fire resistance.

An object of the invention is to obtain filled with polyurethane foam with a high resistance while maintaining the complex of physical and mechanical properties necessary for use as an insulating material.

This technical result is achieved in that in the method of producing polyurethane foam for thermal insulation products by the interaction of the hydroxyl-containing component (A) with the isocyanate component (B) in the presence of special additives and filler, as the last use of sodium silicate with a modulus to 4.0 and a density of 1.3-1.5 g/cm3as the isocyanate component (B) di-and polyisocyanate with the number of NCO-groups 29-33 Mac. %, while carry out pre-smilenastya on sodium silicate) is 100 wt.h. the amount of hydroxyl-containing and isocyanate components.

The technical result can be achieved only with the use of these terms. The decrease in the content of NCO groups in the polyisocyanate, the change against the specified module liquid glass or its concentration in the reaction mixture, and the use as filler other silicate of the metal leads to a sharp decrease in resistance.

As hydroxyl-containing polyol as one component in the way use simple and complex polyesters or mixtures thereof, such as polyether-Laprol with m, m 370, Laprol 5003-2B-10 (TU 6-05-1513-75) - oxypropylated glycerin with m 5000 m; Laprol 805, Supramol 294 (TU 6-05-1681-74), marks Laprol 373 (TU 6-05-221-831-85)-oxypropylated glycerin Laprol 36 03-2-12 and so on; polyesters, grades P-2200, PEF P-7 (TU 6-05-221-429-80), P-509 - based on tall oil, triethanolamine and adipic acid, ICP-800 (polyethyleneglycoladipinate), etc.

As the target additives in the proposed method using various conventional additives usually used in the preparation of polyurethane foams, such as prestabilization (preregulatory), catalysts, foaming agents, water, organic solvents.

As the catalyst used tertiary amines: dimethylethanolamine, diazobicyclo; solutions of salts of alkaline metals in the glycols, for example 30% solution of potassium acetate in ethylene glycol or glycerine, etc.

As a blowing agent is used, in particular porofor CHS-21 (azodicarbonamide), foamable concentrate Procon P1 or be (TU 6-05-221-840-85); and other

As liquid glass is used sodium silicate with module up to 4 and a density of 1.3-1.5 g/cm3.

As the isocyanate component used diisocyanates and polyisocyanates with a content of NCO-groups 29-33% (MDI grades a and B; toluenediisocyanate; PIZ mixture of 4,4 - diphenylmethanediisocyanate with more highly functional polymethylenepolyphenylisocyanate and others)
Upon receipt of polyurethane foam in this way you can use such additional additives as surfactants, pigments, dyes.

Example. Get the foam on standartnoya (cat diazabicyclo, prestabilization cap 2, a blowing agent porofor CHS-21, (liquid glass) and component B is a polyisocyanate component with a content of NCO-groups 29-33% (polyisocyanate B) in the traditional ratio 1;1; sodium silicate with a modulus of 2.75-3,06 and density of 1.33-1,49 g/cm3based 50-150 wt.h. 50 wt.h. the component of the reaction mixture. The resulting mixture is intensively stirred and poured into the form. The process of foaming and forming ends 10-20 minutes Full cure of the material (polyurethane foam) comes through the day.

In table.1 shows the dependency of the reaction mixture to obtain a polyurethane foam.

The test results of samples of insulation materials after stabilization of their properties within 14 days at a temperature of (205)oC are given in table.2.

As seen from the above table.2 data the proposed insulation materials have a high thermal resistance, a relatively low coefficient of thermal conductivity and fire resistance.

The method of producing polyurethane foam for thermal insulation products by the interaction of the hydroxyl-containing component with an isocyanate component in the presence of the target additive and reorgan the second glass with module up to 4 and a density of 1.3 - 1.5 g/cm3as the isocyanate component di - and polyisocyanates with a content of NCO-groups 29 - 33 wt.%, moreover, pre-mixed hydroxyl-containing component with targeted supplements and liquid sodium glass, followed by interaction of the mixture with the isocyanate component and the use of sodium silicate in the amount of 50 to 150 wt.h. in terms of sodium silicate per 100 wt.h. the amount of hydroxyl-containing and isocyanate components.

 

 

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