SU697527A1 - Composition for producing porous polyurethan - Google Patents

Description

(54) COMPOSITION FOR PRODUCING U POLYURETHANE FOAM

The invention relates to the field of producing heat insulating building materials and products, in particular rigid polyurethane foams.

A known composition for the preparation of a rigid polyurethane foam, comprising a hydroxyl-containing compound, a foam stabilizer (polysiloxanalkylene block copolymer), a curing catalyst, which is a mixture of tin octoate, tin dibutyldylauriate, triethylene diamine 1.

The disadvantages of such a composition are the toxicity, the multifunctionality of the catalyst, the low viability, as well as the high cost of organotin catalysts and low strength properties.

The closest to the technical essence is a composition for the preparation of polyurethane foam, comprising a simple hydroxyl-chloro-containing polyester, N-tetraoxypropylene diamine; polyisocyanate, foam stabilizer, freon, water and curing catalyst, which contains dimethyl ethanolamine 2

The disadvantages of rigid polyurethane foams, obtained on the basis of this composition, are low viability, toxicity, and insufficiently high strength properties.

The purpose of the invention is to increase the viability of the composition, reduce toxicity and improve the strength properties of the final product.

This goal is achieved by using magnesium sulfate as the curing catalyst.

5 with the following combination of the components of the composition, weight 4 .: Simple hydroxyl-chlorine-containing poly75-80 ether

0

N-tetraoxypropylene diamine 20-25 Polyisocyanate 120-130 Stabilizer of 1.3-1.8 foam Freon25-30

5 Water 0.5-1.0 Magnesium sulfate 0.05-1.0 Magnesium sulfate is stable at elevated temperatures (within the conditions of the synthesis of polyurethane foams). In addition, the proposed catalyst promotes the best distribution of foam stabilizer and foaming agent, due to which polyurethane foam acquires a uniform cell structure and enhanced strength properties. Magnesium sulphate (MgS04-7H20 grades of analytical grade) was used as a catalyst (GOST 4523-6. In addition, laprol ZOZM-simple three-functional chlorine-containing polyester, obtained by reacting chloral with polyether DR-5bO (Tub -78-67), lapromble 294 is a simple bifunctional nitrogen-containing polyether obtained by the interaction of propylene oxide with an aqueous solution of ethylenediamine {TU 6-05-2651-75), foam stabilizer, as KOTOP use CEP-1 - block copolyme polyorganosiloxane and polyoxysilo on (TU6-02-781-73) ,. the expanding agent Freon-11-fluorotrichloromethane (TU6-02-727-75), a polyisocyanate of the B – P brand, containing 58.5% diisocyanat diphenylmethane, 31.1% isocyanate groups, and 0.022% phenyl isocyanate (TU 6-03-375- 75) -. Example. In a plastic cup, a mixture is prepared in the following ratio of components, parts by weight, Laprol 503M 75 Lapromol 294 25 CEP-11.3 Freon-1125 Water. 0.5 mg MgSO 4 grade; 0.05. The mixture is stirred for 2 minutes until a homogeneous mass is formed / then 120 parts by weight is added. polyisocyanate brand B and the entire mixture is stirred for 30 seconds. , The mixture is then poured into a mold where foaming and curing of the polyurethane occurs. The induction time is 80 seconds with 4 foam lifting 300 seconds, the time of peeling off the foam is 330 seconds. 30-5080 induction time, .sek Foam lifting time, 60-90 300 sec

Tack free foam,

110-150 300 sec

300

340320 Example 2. A hard foam urethane is obtained similarly to measure 1 with the following ratio of components, parts: Laprol 503M 77 Lapromol 294 23 CEP-11, 5 Freon-11 27 Water 0.75 Mgf S O. 7K, 0 mark, chd. 0.1 Polyisocyanate. Induction time 95 sec, time preheated 240 sec. Tack free time foam sec. Example 3. Hard polystyrene is obtained similarly to examples 1 and 2 with the following ratio of ponents, parts: laprol 503M80 Lapromol 29420 CEP-1.1.8 Freon-1130.0. Water1.0 7H20 Grade0.5 Polyisocyanate Induction time 105 sec, foam removal time 300 sec, cast time 340 sec. PRI me R 4. Hard foam polyethylene is obtained analogously to examples 2, 3 with the following ratio of ponents, parts: h .: Laprol 503M80 Lapromol 29420 CEP-11.8 Freon-1130 Water1.0 CrPbollet grade 1tgtt chpaPolyisocyanate, grade B Induction time 75 sec, foam removal time 310 sec, peel off foam sec. The data of the catalytic activity of polyurethane foam foam known known composition compositions are presented in Table. 1. Table 1 9510575 240300310

From tab. 1. it can be seen that the viability of rigid polyurethane foam has increased 2 times, the time of raising the foam is 2-3 times, the time of peel-off foam is 2 times. The use of this catalyst allows. significant with density, kg / m 40-70

Limit-strength in compression, kgf / m cm

Flexural strength, kgf / cm

Specific impact viscosity, kgf / cm

Water absorption

for 1 day kg / m

for 7 days kg / m Magnesium sulphate promotes the best distribution of foam stabilizer and foaming agent, which, in turn, allows to improve the structure of the foam polyurethane cells, thereby forming a homogeneous, closed-cell porous structure, with a clearly defined fibrillar pore structure. From tab. 2 shows that the strength properties offer rigid polyurethane foam is significantly higher than that of the known. The compression limit increases by 1.9-2.4 times, the specific impact on the bone by 3 times, and the water absorption decreases by 18-19 times. Magnesium sulphate is a chemically active substance that reacts with polyethers to form a complex, which coordinates the hydroxyl groups of the hydroxyl-containing compounds, which leads to a decrease in the reaction rate. Penopol urethane has a slight shrinkage. Foaming occurs equally slowly, the reaction and foaming end at the same time. The effectiveness of the invention is achieved by increasing the viability by a factor of 2., increasing the compressive strength by 1.9-2.4 times, the specific

but reduce the toxicity of polyurethane foam, increase the viability and strength properties of it.

The strength properties of the proposed rigid polyurethane foam are given in table. 2

table 2

57,863,8467,53. 70.21

3,934,544,824,21

8,9710,7511,239,98

0.750,800,79

0.45

0.25

0.03

Claims (2)

0.0019 0.0017 0.0017 0.0019 toughness 3 times, water absorption decreases 18-19 times, toxicity decreases. Claims of the Invention A composition for producing polyurethane foam comprising a simple hydroxyl-chloro-containing polyester, N-tetraoxypropylenediamine, a polyisocyanate, a foam stabilizer, freon, water, and a curing catalyst, which is designed to increase the viability of the composition, reduce toxicity, and improve the strength properties of the final product. As a curing catalyst, it contains magnesium sulfate in the following ratio of components. compositions, parts by weight Simple hydroxyl-containing polyether 75-80 N -tetraoxypropylene diamine 20-25 Polyisocyanate 120-130 Foam stabilizer 1.3-1.8 Freon25-30 WaterO, 5-1, O Magnesium sulfate 0.05-1.0 7 Sources of information taken into account during the examination 1. Patent of the USSR No. 312425, cl. C 08 0 18/14, 1964 ,. 6975278 2. Bakhtin V.T. Turkish L, V. Filling foams of the fetan of the improved design. Plastics, 1974, no. 10, p. 51-52 (protypes).