SU413827A1 - Method of producing elastic foam polyrethane - Google Patents

Description

one

This invention relates to the field of polyurethane foam production.

A known method for the preparation of flexible polyurethane foams by the interaction of polymeric ethers, poly-isocyanates, kata. lysing agent and foaming agent, according to which a mixture of isomers of 4,4-diphenium-methane diisocyanate and 2,4- and phenylmethane diisocyanate with a content of 12% of 2,4-isomer is used as polyvisoivanates.

However, the strength characteristics of the material thus obtained were comparatively juiceable, while for some possible applications, for example, for the shoe industry, higher strength properties and attrition rates are required of the material.

The purpose of the present invention is to obtain flexible polyurethane foam having enhanced strength properties, especially resistance

tearing, tearing strength and ist «early.

This is achieved by using a mixture of 4,4-diphenylmethanediisocyanate and 2,4-diphenylmethanedine nianate, with a content of at least 15% by weight of the mixture of the 2,4-isomer, preferably 2O-4O%.

The proposed method for producing flexible polyurethane foam consists in preparing a mixture of propylene oxide copolymer and ethylene oxide with a mole, wt. 2OOO-600O, O-2O wt.% Crosslinking

5 agents of glycols or diamines or their mixtures, O-5% by weight of catalysts - tertiary amine and 5-15% by weight of foaming agents - low-boiling liquids. The mixture is stirred and added to it.

0 4O-7O wt.% Isocyanate component. The resulting mass is poured into a metal mold having a temperature of 155 ° C. The mold is tightly closed and kept 1 :: at room temperature for 3-15 minutes. Psyup this sample of polyurethane foam is removed from the mold. Example 1. In a metal beaker with a capacity of 0.5 liters, 117 copolymer oxide and ethylene oxide copolymer are mixed with mol. weight, 5000, 14.8 g of 2,2-aichloro-4, 4-diamiv: odiphenylmethane, 1O g of 1,4-butanediol, 2.5 g of a 33% solution of diaobicyl octane in diethyl glycol, 7.5 g of freon- 1 and 7.5 g of methyl chloride. This mass is stirred for 15–20 s at a rate of 1400 rev / μn and 6O g of mixture 4, phenylmethane diisocyanate and 2,4-diphenylMetandiaoaiyanate are added in a ratio of 59:41. The resulting mass is stirred for an additional 10-15 seconds, after which the contents quickly poured into a metal mold, preheated to ZO-4О С and lubricated with a special lubricant. The form is tightly closed and held at room temperature for 1–15 minutes. Example 2 In a metal beaker with a capacity of 0.5 l, 117 propylene oxide copolymertriol and ethylene oxide are mixed with mol. its 5OOO; 15 g of 1,4-butadiol, 2.5 g of a 33% solution of di-azobicyclooctane in diethylene glycol; 7.5 pheon-I and 7.5 g of methylene chloride. This mass is stirred for 15–20 s and 6O g of a mixture of 4,4-diphenylmethane diisocyanate and 2,4-diphenylmethane diisocyanate with a content of 15% of the 2,4-isomer is added to it. The mass is stirred for another 10-15 seconds and poured into a metal mold as in Example 1. Example 3. Polyurethane is prepared as in Example 2, but instead of 15 g of butanediol, a mixture of 10 g of butanediol and 14.8 g of 2.2-dichloro-4,4 is added. -diaminodiphenylmeta on. Example 4. Polyurethane foam is prepared as described in Example 2, but a mixture of 80% 4,4-diphenylmethane diisocyanate and 20% 2,4-diphenylmethanide diisocyanate is used as the polyachoacyanate. Example 5. Polyurethane foam is prepared according to example 3, but as a polyisocyanate, a mixture of 4,4-diphenylmethane ndiis one per 2,4-diphenyl methane diisocyanate is used in a ratio of 50:50. Example 6. Polyurethane foam is prepared according to examples 3 and 4, but as a polyisocyanate, a mixture of 90% 4.4 diphenylmethane diisocyanate and 1O% 2,4-diphenylmethane diisocyanate is used. Example 7. Polyurethane foam is prepared according to example 1, but a mixture of 88% 4,4-diphenylmethane diisocyanate and 12% 2,4-lipylmethyl di-diisocyanate is used as a polyisocyanate. The table shows the physico-mechanical properties of polyurethane foam, obtained

A mixture of 4,4-diphenylmethane diisocyanate and 2,4-diphenylmethane diisocyanate (ан9: 41 / A mixture of 4,4 -difé t анди methane diisocyanate and 2,4-diphenylmethanediisoisianate (85:15 Mixture of 4,4-diphenylmethanthigazocyanate and 2,4-diphenylmethane diisocyanate (85 : 15 A mixture of 4,4-diphenylmethane diisociavate and 2,4-diphenylmethandehyde oxides (BO- 2 O 25 7.0 97 9.0 87 6.0 91 7.0 A mixture of 4,4-diphenylcvac akaite and 2.4 -diffetsmet antsioeiazavat (5O: 59) O, 76 26.5 A mixture of 4,4-diphenipmetavdzyzrcyanate and 2,4-diphenipmeth diisoiaiate (90: 1O) 0.4 iQ; 5 A mixture of 4,4 -diphenymemethiisocyanate and 2,4 - tethesmeandandaziocyanag (88: 2) 0.72 14.3

Claims (1)

From the data in Table 1, that polyurethane foam obtained using polyisocyanate containing not less than 15% of 2,4.-diphenylmethanide and isocyanate has better physical and physical properties. 35 Formula of invention The method of obtaining flexible polyurethane foam by interacting with the Continuation Table polyethers and haoli-isocyanates in the presence of a catalyst and a blowing agent, characterized in that a mixture of 4,4 -diphenium is used as the polyisopyanate component; methane diisocyanate and 2,4-diphenylmetha diisocyanate with a content of at least 15% by weight of the mixture of 2,4-isomer, preferably 20-4%, 6.40 26.0 3.83 7.0 472 2.76 5.0 ZZD