Composition for the production of rigid foam isocyanatomethyl

 

The invention relates to compositions for the production of rigid isocyanatomethyl foams and can be used for thermal insulation with high resistance coatings and products used in construction, machinery, shipbuilding, refrigeration, energy. Describes a composition for the production of rigid isocyanatomethyl foam containing isocyanatomethyl component, a trimerization catalyst, emulsifier, trichlorethylene and halogenougljovodonika, and as a catalyst for the trimerization it contains a solution of a mixture of Pikalevo salt of dioxideemissions with potassium phenolate in ethylene glycol at a mass ratio of 1: 0,8-1,1: 2,5-3,5, respectively, and the emulsifier comprises a mixture of organosilicon block copolymer potassium salt of di-(alkylpolyglycoside)ester of phosphoric acid at a mass ratio of 1: 15-20, respectively. The proposed arrangement allows to improve the fire resistance of the obtained foams while maintaining their physical and mechanical characteristics. table 2.

The invention relates to compositions for the production of rigid isocyanatomethyl foams and can Bisti D2 GOST 30244-94, used in construction, machinery, shipbuilding, refrigeration, energy.

Known composition for the production of rigid polyurethane foam containing polyester, silicone prestabilization, foaming agent, trichlorethylene, aluminium hydroxide, tertiary amine, a catalyst solution of alkali metal carboxylate in the glycol and a polyisocyanate (patent RU N 2128676, CL 08 G 18/16, 18/30, 08 L 75/04, 1999). In this composition to reduce the Flammability of uses, including aluminium hydroxide, which is introduced into the hydroxyl-containing component in the form of powder, insoluble in hydroxyl-containing component.

The disadvantages of the specified composition is increased abrasive wear of the dosing and mixing devices, which dramatically reduces the lifetime of the equipment. In addition, in the manufacture of specified composition increased energy costs due to the need of continuous stirring the mixture to prevent settling of aluminium hydroxide and its distribution within the volume of the hydroxyl-containing component.

Known catalysts for the trimerization of isocyanates: the alcoholate, the reaction and carboxylates of alkali metals and alkaline hydroxide metallocene in the patent RU N 2128676, 1999.

The disadvantage of the foams obtained with their use, is the Flammability level group G3.

Closest to the invention to the technical essence and the achieved effect is a method for isocyanatomethyl foam consisting of a mixture of the product of the interaction of tall oil with triethanolamine, a blowing agent, surfactant and catalyst for the trimerization of excess MDI, which is selected as a prototype. As the surfactant used organosilicon compounds or potassium salt of di-(alkyltrimethyl)-ester of phosphoric acid, and as a catalyst for the trimerization use a 30% solution of potassium acetate in ethylene glycol (patent RU N 2034858, class C 08 G 18/08, 1995). Obtained by this method foams have high physical and mechanical characteristics.

To the disadvantage of the prototype is the use of the product on the basis of tall oil (100 wt.h. on 230-390 wt.h. MDI), which does not allow to obtain foams with stable physical and mechanical properties due to the high dependence of the qualitative and quantitative composition of tall oil from rocks pererabotka parameters pulping, a byproduct of which is tall oil.

In addition, the use of interaction product of tall oil and triethanolamine in the aforementioned patent quantities allows to obtain foams belonging to groups Flammability G3 and G4, which significantly limits their use.

The technical result of the invention is to increase the fire resistance of the foam to the group G2 combustibility while maintaining the physico-mechanical characteristics.

The invention consists in that the composition for the production of rigid isocyanatomethyl foam contains isocyanatomethyl component, a trimerization catalyst, emulsifier, trichlorethylene and halogenougljovodonika, and as a catalyst for the trimerization it contains a solution of a mixture of Pikalevo salt of dioxideemissions with potassium phenolate in ethylene glycol at a mass ratio of 1:0,8-1,1:2,5-3,5, respectively, and the emulsifier comprises a mixture of organosilicon block copolymer potassium salt of di-(alkylpolyglycoside) ester of phosphoric acid at a mass ratio of 1:15-20, respectively, at the following mass ratio of components, wt.h.: Isocyanatomethyl 28,00-31,00 Halogenougljovodonika - of 8.50-10.50 per composition in the composition of the emulsifier used potassium salt of di-(alkylpolyglycoside) ester of phosphoric acid of General formula [RO(CH2-CH2O)n]2-P(=O)OK, where R is an alkyl group with6-C10and n the average is 6. Preferably used Exitos B on THE 6-02-1177-92 or Exits B-1 on THE other 6-02-1336-86.

As the organosilicon block copolymer used dialkylacrylamide block copolymers, preferably cap-2, cap-2A, you can use the cap 3, the cap 6.

As kalogeropoulou composition contains freon (a mixture of freon) with a boiling point of 20-40oWith, preferably a Halocarbon 11 (Trichlorofluoromethane) and Halocarbon 113 (trichloro-trifluoroethane).

The trimerization catalyst contains 1.0 wt.h. Pikalevo salt of dioxideemissions, 0.8 to 1.1 wt. including potassium phenolate, which dissolved at 2.5-3.5 wt.h. of ethylene glycol. As the source of the product to obtain Pikalevo salt is used dioxideemissions - technical product that is a mixture of isomers. Feature of dioxideemissions is its high resistance, the auto-ignition temperature is 950oC, and at temperatures of 500-800oWith the is f is anegasaki.

As isocyanatobenzene component of the composition comprises a polyisocyanate or diphenylmethanediisocyanate.

Example 1 a Catalyst for the trimerization consists of Pikalevo salt of dioxideemissions, potassium phenolate, which dissolved in ethylene glycol at a mass ratio of 1.0:0,9:3,0 respectively. The emulsifier consists of a cap 2A and Oxytoca B in their mass ratio of 1:15.

The composition contains 29 wt.h. trichloracetate, of 0.65 wt.h. emulsifier, and 9.5 wt.h. halon 11, 0.7 wt.h. the trimerization catalyst, are mixed until complete homogenization, and 50 wt.h. MDI
The obtained closed-cell insulation foam has the following physico-mechanical characteristics:
Apparent density, kg/m3- 57,3
Compressive strength at 10% linear strain, MPa - 0,26
To ensure that the material belonged to the group G2 combustibility according to GOST 30244-94 must be sustained following parameters for firing tests:
The temperature of the flue gases,oWith No more than 235
The extent of damage along the length of, % - less than 85
The degree of damage by mass % for groups G2 and G3 is Not over 50
Self-burning, with Not more than 30
Foam for example, after firing tests gave the following result by weight, % - 13
Self-burning, with - 6
On the basis of the tests it is concluded that the material belongs to the group G2 combustibility.

Example 2
Composition analogous to example 1 using the components shown in table 1. In the composition of the emulsifier used Exits B1. As kalogeropoulou uses a mixture consisting of 5.0 wt.h. halon 11 and 5.5 wt.h halon 113.

Example 3
Composition analogous to example 1 using the components shown in table 1. As the emulsifier used Exits B1. As isocyanatobenzene component is used 4,4'-diphenylmethanediisocyanate.

Example 4
Composition analogous to example 1 using the components shown in table 1.

Example 5
Composition analogous to example 1 using the components shown in table 1. In the composition of the emulsifier used Exits B1.

Example 6, example 7 (prototype)
The resulting foams belong to the group of combustibility G4, because the parameter "degree of damage by weight" exceeds 50%.

The claimed composition significantly reduces the Flammability of foam (with G4 in the prototype to G2 at the claimed compositions) while maintaining a high level of physical-mechanical Prov./p>

Composition for the production of rigid isocyanatomethyl foam containing isocyanatomethyl component, a trimerization catalyst, emulsifier, trichlorethylene and halogenougljovodonika, characterized in that as a catalyst for the trimerization it contains a solution of a mixture of Pikalevo salt of dioxideemissions with potassium phenolate in ethylene glycol at a mass ratio of 1: 0,8-1,1:2,5-3,5, respectively, and the emulsifier comprises a mixture of organosilicon block copolymer potassium salt of di-(alkylpolyglycoside) ester of phosphoric acid at a mass ratio of 1:15-20, respectively, in the following ratio, wt.h.:
Isocyanatomethyl component - 47,00-53,00
The specified catalyst for the trimerization - 0,60-0,75
The specified emulsifier - 0,55-0,70
Trichloroethylphosphate - 28,00-31,00
Halogenougljovodonika - 8,50-10,50 W

 

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