SU418067A1 - Method of producing integral elastic foam poluyrethane - Google Patents

Description

The invention relates to methods for producing integral elastic polyurethane foams.

A method of producing an integral flexible polyurethane foam by reacting ⁵ gidroksilsoder- zhaschego component (simple or polyester) with a polyisocyanate in the presence of a catalyst, the crosslinking and foaming agents, at which ₁₀ are used as the crosslinking agent

3,3-dichloro-4,4-diaminodiphenylmethane.

However, since the cross-linking agent used in this “ ¹ method” is a crystalline solid, ^{15 of it} is introduced into the composition to produce a foam when the mixture is heated to 100 ° C. Moreover, 3,3-dichloro-4,4'-diaminodiphenylmethane partially decomposes and ', no, which necessitates the introduction of thermal stabilizers. If thermal stabilizers are not used, then polyurethane foam is of poor quality.

The purpose of the invention is to simplify the process of obtaining an integral elastic polyurethane foam by reducing the melting point of a crosslinking agent.

This object is achieved in that the crosslinking agent is a liquid mixture of 3, Z ^{t-dichloro-4,4} -di- _# ¹ aminodiphenylmethanes and 3,3 ^- Dichloro-4,4I-diaminotrifo'nilmetana taken vsoot ¹ ' wearing 30: 70-70: 30.

3,3'-Dichloro-4,4 ^f -diaminodiphenylmethane has the structural formula ¢ 1 ¢ 1 and 3,3-dichloro-4,4-diaminotriphenylmethane

The proposed method for producing integral elastic polyurethane foam consists in preparing a mixture of a hydroxyl-containing component, a catalyst, crosslinking and foaming agents. This mixture is stirred at room temperature with a polyisocyanate stirrer at a speed of 1000-5000 rpm for 5 ~ 20 s, after which it is poured into a metal mold, previously carefully lubricated.

Curing of the product occurs within 5–15 min at room temperature. The resulting integral polyurethane foam has a cellular core and a dense outer crust, capable of accurately reproducing any shape pattern.

As a process using the catalysts as tertiary amines or compounds of metals of type dilaurinata dilaurate, stannous octoate, etc. n.'j as blowing agents -. Niz'kokipyaschie halogen-containing hydrocarbons such as polyisocyanates various isomers of diphenylmethane diisocyanate _and? mixtures thereof, prepolymers based on it.

Polyurethane foams obtained by the proposed method can in the shoe industry of the soles of shoes, in STI for cleaning dov.

P.

used as industrial piping30 petroleum petroleum

Example

1. To 78 weight. including copolymer of propylene oxide and ethylene oxide (ethylene oxide content of 10 wt.%) mol. weight, 5000 add 34.3 wt., hours a mixture of 50 weight. % 3,3-dichloro-4,4'-diaminodiphenylmethane _t ⁴⁰ (MOCA) and 50 wt. % 3,3 * “dichloro-4,4-diaminotriphenylmethane and representing a viscous mass of dark color with the content of ΝΗ ,, - groups of 10.35%. The mass is homogenized at 70-80 ° C. and, after cooling to room temperature, 2 weight is added to it. including 33% “solution of triethylenediamine (DAVCO) in diethylene glycol, 5 wt. including methylene chloride and '5 weight. h. freon. The mass is stirred for 30-40 s, then with a working stirrer add 39 weight. including liquefied diphenylmethanediisocyanate with a content of Ν ₍ CO groups of 30.7%. Stirred at a speed of 1400 rpm for 15 s, quickly poured into a metal mold measuring 195 * 60 * 10 mm and sealed. Hold at

418067 4 at a temperature for 10 min and finished products having a cellular dense crust are removed from the mold.

For testing, samples that started:

Average volumetric weight

0, g / cm ³

The tensile strength of the core and two of the products cut down are as follows 0.65 / tensile (y, kg / cm Elongation €,% Tear strength (Ur, kg / cm

Example 2. Kb5 weight.

a copolymer of propylene oxide and ethylene oxide (according to example 1) add 29 weight. including a mixture of 70 weight. % 3.3 ^{/ _-} dichloro-4,4-diaminotriphenylmethane and 30 weight. % MOSA and representing a light-colored viscous mass.

The mixture of the copolymer and a crosslinking agent is homogenized at 70-80 ° C, cooled to 18-20 ° C and. add to it

1.7 weight. including a '33% ^_ solution of DAVCO in diethylene glycol, 4.1 wt. including Freon, 4.1 weight. including methylene chloride and mix thoroughly. Then add

32.5 weight including liquefied diphenylmethanediisocyanate, stirred for 15 seconds and poured into a metal mold. Curing is carried out according to example 1.

The indicators of the obtained samples are as follows:

γ, g / cm ^ (f, kg / cm ^x £,% kg / cm

Example 3 · measure 26 according to the example of a crosslinking agent. h

0.7

Polyurethane foam according to 2, but as' add to the copoly ______ .. mixture, consisting of 30 weight. % 3.3 ^G -Dichloro-4 ^ -diaminotriphenylmethane and 70 weight. ° / _a MOSA.

The performance of the samples of polyurethane foam is as follows:

of, g / cm ^ 0.5 (y, kg / cm * 2-39 ε,%. ’59 (Er, kg / cm7 ~ 9

PRI me R 4. The polyurethane foam obtained in example 1, but as a crosslinking agent add 17.15 weight. including a mixture of 50 weight. % 3.3 ^{, -} dichloro-4,4'-diaminotriphenylmethane and 50 wt. % MOS and 5 weight. including 1.4 ^{g of} butanediol.

The performance of the samples of polyurethane foam is as follows:

ηΤ, g / cm 50.67 (O ', kg / cm ² -74 e,% 26 (5р, kg / cm 12

PRI me R 5. (For comparison).

Only 3.3 ^{G of} “Dichloro-4,4-diaminodiphenylmethane” is used as a crosslinking agent. To homogenize the mass of 78 weight. including polyester (as per example 1) and 29.5 weight. including 3,3-dichloro-4,4-diaminodiphenylmethane is heated to 100 ° C. Preliminarily, a thermal stabilizer is added to the mixture in an amount of 0.1-0.2 weight. h. The resulting mixture was cooled to room temperature and then act as in example 1.

The performance of the samples of polyurethane foam 10 in the given example shows that when obtaining polyurethane foam using only 3,3 * -dichloro-4,4 ″ diaminodiphenylmethane as a cross-linking agent, it is necessary to use a thermal stabilizer and raise the temperature to 100 ° C, which complicates the process of obtaining an elastic integral polyurethane foam.

I

Claims (1)

This invention relates to methods for producing integral flexible polyurethane foams. A method of obtaining integral elastic polyurethane foam by reacting a hydroxyl-containing component (polyester or polyester) with a polyisocyanate in the presence of a catalyst, crosslinking and foaming agents, in which 3,3-dichloro, -diaminodiphenylmethane is used as a crosslinking agent. However, since the cross-linking agent used in this method is a crystalline solid, it is introduced into the composition to obtain a foam by heating the mixture to 100 ° C. At the same time, 3,3-dichloro-4, -diaminodiphenylmethane partially decomposes and therefore, necessitates the introduction of heat stabilizers. If thermal stabilizers are not used, then polyurethane foam is of poor quality. The purpose of the invention is to simplify the technological process of obtaining integral elastic polyurethane foam by reducing the melting point of the crosslinking agent. This goal is achieved by using as a cross-linking agent ai SP I and KiuiiujiDoyiui, 3-dichloro, -digid mixture of 3i la and 3,3-Dichloro, aminodiphenylmethane -diaminotrif | yonilmetan, taken in a ratio of 30: 70-70: 30. 3,3-Dichloro-, L, -diaminodiphenylmethane has the structural formula H ,, 3-Dichloro-, - Diaminotriphenylmethane. C1. The proposed method for producing an integral elastic polyurethane foam is to prepare a mixture of a hydroxyl-containing component, a catalyst, a crosslinking and foaming agents. This mixture is stirred at room temperature with a polyisocyanate stirrer at a speed of 1000–5000 rpm for 5–20 s, after which it is poured into a metal mold that has been carefully lubricated. Curing of the product occurs within minutes at room temperature. The resulting integral polyurethane foam has a honeycomb core and a dense outer crust capable of accurately reproducing any shape pattern. as a process catalyst is used as tertiary amines and compounds of metals of type dilaurinata dilaurate, stannous octoate, etc., as blowing agents -. Downhill kokip Suitable halogen-containing hydrocarbons such as polyisocyanates various isomers of diphenylmethane diisocyanate and tolylene diisocyanate mixtures thereof, prepolymers based on them etc. The polyurethane foam obtained by the proposed method can be used in the shoe industry as shoe soles in the oil industry for cleaning oil pipelines. ov Example1. To 78 weight. including copolymer of propylene oxide and ethyl oxide on (ethylene oxide content 10 wt.% mol. weight, 5000 add 3.3 wt. parts of a mixture consisting of 50 wt.% 3,3-dichloro, C-diaminodiphenylmethane | 4 4 rii ijiitv I g (NOCA) and 50 wt.% 3,3-Dichloro-4,4-diaminotriphenylmethane and a dark, viscous mass with a content of NH -rpynn 10.35. The mass is homogenized at 70-80 ° C and after cooling to room temperature, 2 parts by weight of rastvor triethylenediamine (DAVCO) in diethyl glycol, 5 parts by weight of methylene chloride and 5 parts by weight of freon are added to it. The mass is stirred for 30-40 seconds. , behind In this case, 39 parts by weight of liquefied diphenylmethanmide isocyanate containing NjCO-groups 30 are added with the stirrer, Stir at rpm for 15 seconds, quickly poured into a metal mold with a size of mm and sealed. For 10 minutes, finished products with a honeycomb core and two dense crusts are removed from the mold. For tests from the products, samples are cut down which have the following indicators: Average volume weight T,, 65 Tensile strength at stretch (5, kg / cm 85 Relative elongation €, 13 Tensile strength (Ur, kg / cm18 Example2. Kb5 weight Part of a copolymer of propylene oxide and ethylene oxide (according to example 1) was added 29 wt. including a mixture consisting of 70 wt. % 3,3-dichloro-, 4-diaminotriphenylmethane and 30 wt. MOSA and a light colored, viscous mass. The mixture of copolymer and crosslinking agent is homogenized at 70-8 ° C, cooled to 18-20 ° C and. 1.7 wt. part SZ-aqueous solution Dawso in diethylene glycol, 1 weight. h. freon, 1 wt. including methylene chloride and mix thoroughly. Then 32.5 wt. including liquefied diphenylmethane diisocyanate, stirred for 15 seconds and poured into a metal mold. Curing is carried out according to Example 1. The indicators of the obtained samples are blinding: g / cm G kg / cm (G.,% br kg / cm) Example 3 Polyurethane foam is prepared as in Example 2, but as a crosslinking agent is added to copolymer 2b part by weight of a mixture consisting of 30% by weight 3,3-Dichloro-, 4-diaminotriphenylmethane and 70% by weight MOSA. The polyurethane foam samples are as follows:, 5 G-, kg / cm-З-39 , 59 (5p, kg / cm) EXAMPLE 2 Polyurethane foam is prepared as in Example 1, but 17.15 parts by weight of a mixture consisting of 50% by weight 3,3-di chlorine-, -diamt notriphenylmethane and 5 0 wt. MOSA and 5 wt. H. 1,4-butanediol. Indicators of samples of polyurethane foam for the following:, g / cm50.67 (5, kg / cm2.7 t,% 26 br, kg / si12) p 5. (For comparison). Only 3,3-dichloro-4,4-diaminodiphenylmethane is used as a crosslinking agent.To homogenize the mass of 78 parts by weight of polyester (of Example 1) and 29.5 weight of parts 3, 3-dichloro-it, 4-diaminodiphenylmethane is heated to 100 C. A heat stabilizer in an amount of 0.1-0.2 wt. Is added to the mixture. The mixture obtained is cooled to room temperature and then acts as in example 1. The following are examples of polyurethane foam samples: g / cm kg / cm (Ur, kg / cm From the given example, it follows that when producing polyurethane foam using only 3 as a crosslinking agent , 3-Dichloro-4,4-diaminodiphenylmethane, it is necessary to apply a heat stabilizer and raise the temperature to, which complicates the technological process of obtaining flexible integral polyurethane foam. I The invention Formula A method for producing an integral elastic foam polyurethane by reacting a hydroxyl-containing component and a polyisocyanate in the presence of a catalyst, crosslinking and foaming agents, characterized in that, in order to simplify the process, a mixture of 3,3-dichloro-4,4-diaminodiphenylmethane and 3,3- is used as a crosslinking agent Dichloro-4,4-diaminotriphenylmethane, taken in a ratio of 30: 7070: 30.