Method of producing elastic polyurethane foam products

 

(57) Abstract:

Usage: in the furniture industry, vehicles, packaging, manufacture of toys. The essence of the invention: a simple polyester, water, catalyst, silicone prestabilization and target additives are mixed, add to the mixture of prepolymer based on toluylene diisocyanate with 20 to 3 wt.% isocyanate groups and Polyoxypropylenediamine from 10 to 18 wt. % end ethyleneoxide groups and a hydroxyl number of 26 to 36 mg KOH/g Prepolymer added in an amount to provide the ratio between isocyanate groups and active Cheremisinova hydrogen atoms (0,8 - 1,2) : 1, molded products with a volume of 0.15 m3and more. table 1.

The invention relates to polyurethane chemistry and relates to a method of producing elastic polyurethane foam product of more than 0.15 m3used in the furniture industry, vehicles, toys, etc.

There is a method of producing elastic polyurethane foam product by mixing polyether, water, silicone prestabilization, catalyst, aromatic diisocyanate and special additives (1).

The way pozvaleet due to the use of toluylene diisocyanate, the complexity of the technological process, as well as the low strength properties of the obtained polyurethane foam.

The closest in technical essence is a method of producing elastic polyurethane foam product by mixing polyether, water, catalyst, silicone prestabilization and special additives, the compounds of the mixture with prepolymers based on toluylene diisocyanate and Polyoxypropylenediamine with subsequent dosing of the mixture in the form (2).

The disadvantage of this method is the impossibility of obtaining products with a volume of 0.15 m3and more.

The aim of the invention is the obtaining of products from polyurethane foam with a volume of more than 0.15 m3.

This goal is achieved by the fact that as prepolymer use connection-based Polyoxypropylenediamine with 10-18 wt. % end ethyleneoxide groups and gidroksilnym number 26-36 mg KOH/g and containing 20 3 wt.% isocyanate groups, taken in an amount to provide a ratio of isocyanate groups and active Servicenow hydrogen atoms (0,8-1,2) : 1.

In the invention using the following connections:

simple palp), Desmophen 3900 (Bayer), etc.;

water as a blowing agent;

as a catalyst for nitrogen-containing compounds, for example, 1,4-diazabicyclo-2,2,2-octane, dimethylethanolamine, bis-dimethylaminoethyl ether derivatives of the research, triethylamine, urea, derivatives of piperazine;

the copolymers of siloxanes with polyoxyalkylene as silicone stabilizer, for example, cap-2, cap-8, L-540, L-620 (company Union carbide) DC-190 (the company Dow Corning, USA), and others;

prepolymer based on toluylene diisocyanate and Polyoxypropylenediamine with 10-18 wt.% end ethyleneoxide groups and a hydroxyl number 26-36 mg KOH/g is a storable liquid with a viscosity of 300-800 MPas at 20aboutC;

as the target additives using various cross-linking agents that are active with respect to NCO groups, for example, alkanolamine, various flame retardants, dyes.

Mixing of the components is carried out in 2 stages: first, in a simple polyester with 18-40aboutTo add water, catalyst, prestabilization and targeted supplements, and then the resulting mixture is combined with prepolymers, taken in an amount to provide a ratio of isocyanate g is R. In the capacity of 80 l put 35 kg polyether mol. m 3600 containing 12% ethyleneoxide groups, statistically placed along the chain of the macromolecule, 1.22 kg of water, 0,17 kg CEP-2A, 0.05 kg of diazabicyclo, 0,17 kg of carbon black. These products mix, using a disk stirrer with a speed of 900 rpm for 10 min, add 28,4 kg prepolymer on the basis of TDI 80/20 and Polyoxypropylenediamine with 13 wt.% end ethyleneoxide groups and a hydroxyl number of 34 kg KOH/g, containing 22 wt.% isocyanate groups. The ratio between the isocyanate groups of prepolymer and active Servicenow atoms of hydrogen donors which are simple polyester and water, is 0.9 to 1. Stir the mixture for 12 and then quickly poured into a form with a capacity of 2 m3representing a parallelepiped with dimensions 2 x 1 x 1 m Wall and the cover forms lined with plastic wrap. After 15 min after pouring in the form of a mixture of the product is recovered and 24 h stand.

METHOD of producing ELASTIC POLYURETHANE foam PRODUCT by mixing polyether, water, catalyst, silicone prestabilization and special additives, the compounds of the mixture with preium mixture in the form characterized in that, with the aim of obtaining products of more than 0.15 m3as prepolymer use connection-based Polyoxypropylenediamine from 10 to 18 wt.% end ethyleneoxide groups and a hydroxyl number of 26 to 36 mg KOH/g and containing 203 wt.% isocyanate groups, taken in an amount to provide a ratio of isocyanate groups and active Servicenow hydrogen atoms (0,8-1,2):1.

 

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