The method of producing a liquid polyurethanes with terminal epoxy groups

 

(57) Abstract:

The invention relates to a method of producing a liquid polyurethanes with terminal epoxy groups, which can be used as a binder for adhesives, sealants, coatings for various applications, used in construction and other industries. Describes a method of producing a liquid polyurethane polymers with terminal epoxy groups by the interaction of the compounds of propylene oxide with a diisocyanate followed by treatment of the resulting prepolymer with glycidol under stirring in the presence of the stabilizer is a salt dibutylamine fraction of synthetic fatty acids WITH10-C13or salt dibutylamine lauric acid12citric acid or Aerosil, with further interaction with 2-ethylhexanol in the presence of a catalyst of magnesium oxide. The invention allows to obtain a liquid polyurethane with terminal epoxy groups, which can be cured at atmospheric conditions. 3 table.

The invention relates to methods of producing liquid polyurethanes with terminal epoxy groups, which can be used as a binder for kleh industry.

A method of obtaining urethane polymers with terminal epoxy groups by exhaustive interaction polyalkylated with a molecular mass of 750-3500 with the diisocyanate with the subsequent processing of the resulting prepolymer 25-30% aqueous solution of hydrogen peroxide and further amoxicillin - glycidol under stirring at a temperature of 40-80oWith the patent 1151545 And IPC C 08 G 18/08, 1985.

The synthesis of such compounds is carried out in two stages:

the first is getting macrodiisocyanate;

HO-R-OH+2NCO-R'-NCO-->NCO-R'-NHCOO-R-NHCOO-R'-NCO

the second interaction macrodiisocyanate with hydroxyl groups of epoxy compounds of the type epoccipitals.

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However, the ways oligomers generally have a high viscosity.

The objective of the present invention to provide a liquid polyurethane with terminal epoxy groups, which can be cured at atmospheric conditions.

The problem is solved due to the fact that in the known method of obtaining a urethane polymers with terminal epoxy groups as polyalkylated use the copolymerization product of glycerine with propylene oxide with molecular the - what imoney acid or Aerosil at 50-60oWith further cooling to 45-50oC, interaction with 2-ethylhexanol in the presence of a catalyst of magnesium oxide, cooling the prepolymer to 35-40oC, followed by mixing with glycidol at 40-50oWith introduction by cooling to 35-40oWith stabilizer 222-08 - salt dibutylamine fraction of synthetic fatty acids WITH10-C13or stabilizer 222-09 - salt dibutylamine lauric acid12and carrying out the reaction at 60-65oTo the absence of NCO-groups.

The proposed solution allows to obtain a low viscosity liquid polyurethanes, cured at room temperature, due to the interaction product of a copolymer of glycerol and propylene oxide with a molecular mass of 4503-5003, toluylene diisocyanate, glycidol in three stages:

stage 1 - receipt of the prepolymer by reacting the product of a copolymer of glycerol and propylene oxide with a molecular mass of 4503-5003 and diisocyanate in the presence of the stabilizer is citric acid or Aerosil:

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stage 2 - synthesis of prepolymer - interaction of the obtained prepolymer with 2-ethylhexanol in the presence of a catalyst is magnesium oxide:

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10-C13or stabilizer 222-09 - salt dibutylamine lauric acid12:

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When implementing the method are the components that are shown in table 1.

The method is as follows.

In the reactor of 1 liter with a stirrer, jacketed for heating and cooling, fitting to create a vacuum load at a temperature of 50-60oWith the copolymerization product of glycerine and propylene oxide with a molecular mass of 4503-5003. To stabilize the synthesis enter the citric acid or Aerosil and the mixture is stirred at a temperature of 60-80oC, the mixture is then cooled to a temperature of 50-60oWith and enter diisocyanate (toluylene-2,4 and 2,6 isomers in the ratio of 65:35 or toluylene-2,4 and 2,6 isomers in the ratio of 80: 20, or toluylene-2,4-diisocyanate). The reaction mixture is stirred at a temperature of 60-70oWith a residual pressure of not more than 20 mm RT. Art. to constant content of NCO-groups.

Then the obtained prepolymer is cooled to a temperature of 45-50oWith and give him magnesium oxide and 2-ethylhexanol and lead synthesis at a temperature of 45-55oWith a residual pressure of not more than 20 mm RT. Art. to posto is stirring enter glycidol and lead synthesis at a temperature of 40-50oC.

After 2 hours of the synthesis mixture is cooled to a temperature of 30-40oWith injected stabilizer 222-08 - salt dibutylamine fraction of synthetic fatty acids (C10-C13or stabilizer 222-09 - salt dibutylamine lauric acid12and lead synthesis, to lack of NCO-groups.

Temperature regimes examples of specific performance is presented in table 2.

The results of the synthesis of liquid polyurethane is presented in table 3.

On the basis of polyurethane, epoxy groups obtained by this method, plant them. S. M. Kirov experimental-industrial batch of construction mastics LT-1M, which was successfully tested. The sealant has a strength of more than 1.0 MPa, elongation varying between 250 and 600%, elastic at temperatures below -50oWith, can absorb deformation in joints 30-40%, has good adhesion to dry and wet concrete.

Sealant satisfactorily behaves under the influence of climatic factors: UV irradiation, the sprinkler alternating temperatures from -60 to +70oWith

The method of producing a liquid polyurethane polymers with terminal epoxy groups by the interaction of the compounds of propylene oxide with toluylene fact, as compounds of propylene oxide is used, the copolymerization product of glycerine with propylene oxide with a molecular mass of 4503-5003 and obtaining prepolymer is carried out in the presence of the stabilizer is citric acid or Aerosil at 50-60oWith further stirring at 60-70oC and cooled to 45-50oC, interaction with 2-ethylhexanol in the presence of a catalyst of magnesium oxide at 45-55oC, cooling the prepolymer to 35-40oC, followed by mixing with glycidol at 40-50oWith introduction by cooling to 35-40oWith stabilizer 222-08 - salt dibutylamine fraction of synthetic fatty acids WITH10-C13or stabilizer 222-09 - salt dibutylamine lauric acid C12and carrying out the reaction at 60-65oTo the absence of NCO-groups.

 

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