Liquid polyurethane composition with terminal epoxy groups

 

(57) Abstract:

The invention relates to a liquid polyurethane compositions with terminal epoxy groups, which can be used as adhesives, sealants, coatings for various applications, used in construction and other industries. Describes a liquid polyurethane composition with terminal epoxy groups containing a copolymerization product of glycerine and propylene oxide with a molecular mass of 4503-5003, toluylenediisocyanate, glycidol and as a stabilizer and salt dibutylamine fraction of synthetic fatty acids WITH10-C13or salt dibutylamine lauric acid12, 2-ethylhexanol, citric acid or Aerosil and magnesium oxide. The invention allows to obtain a liquid polyurethane with terminal epoxy groups, which can be cured at atmospheric conditions. table 2.

The invention relates to a liquid polyurethane compositions with terminal epoxy groups, which can be used as a binder for adhesives, sealants, coatings for various applications, used in construction and other industries.

Known composition contains polyalkylene with a molecular mass of 750-3500, toluylenediisocyanate, 25-30% aqueous hydrogen peroxide solution, glycidol.

However, this composition has 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 the liquid polyurethane composition with terminal epoxy groups on the basis of toluylenediisocyanate and glycidol additionally contains as a stabilizer salt dibutylamine fraction of synthetic fatty acids (C10-C13or salt dibutylamine lauric acid C12, 2-ethylhexanol, citric acid or Aerosil, magnesium oxide as a stabilizer in the following ratio of components, wt. including:

The copolymerization product of glycerine and propylene oxide with a molecular mass of 4503-5003 - 100

Toluylenediisocyanate - 9,9-12,1

Glycidol - 4,1-5,2

2-Ethylhexanol - 2,5-3,0

Citric acid or - 0,04-0,05

Aerosil - 0,4-0,5

Magnesium oxide - 0,01-0,015

Salt dibutylamine fraction of synthetic fatty acids (C10-C13or salt Diogo polyurethane, presented in table. 1.

The song is produced by synthesis of polyurethane-based copolymer of glycerol and propylene oxide with a molecular mass of 4503-5003 in three successive stages:

stage 1 - receipt of the prepolymer by reacting the product of copolymerization 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 (see diagram 1 at the end of the description).

stage 2 - interaction of the obtained prepolymer with 2-ethylhexanol in the presence of a catalyst is magnesium oxide (see scheme 2).

stage 3 - the elongation of the chain due to the reaction of the NCO groups of the prepolymer with glycidyloxy alcohol in the presence of the stabilizer 222-08 - salt dibutylamine fraction of synthetic fatty acids WITH10-C13or stabilizer 222-09 - salt dibutylamine lauric acid12(see diagram 3).

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, then add 2,4-toluylenediisocyanate. The reaction mixture was stirred at temperam the resulting prepolymer is cooled to a temperature of 45-50oWith and give him magnesium oxide and 2-ethylhexanol, and conduct a synthesis at a temperature of 45-55oWith a residual pressure of not more than 20 mm RT.article to the constant NCO-groups.

Next, the resulting prepolymer is cooled to a temperature of 35-40oWith stirring, enter glycidol and lead synthesis at a temperature of 40-50oC.

After 2 h of synthesis mixture is cooled to a temperature of 30-40oWith injected stabilizer 222-08 - salt dibutylamine fraction of synthetic fatty acids (C10-C13and lead synthesis, to lack of NCO-groups.

Examples of specific performance are presented in table. 2.

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 +70oC.

Liquid polyurethane composition with terminal epoxy groups containing simple polyester connection of propylene oxide, toluylenediisocyanate and glycidol, characterized in that as a simple polyester it contains a copolymerization product of glycerine and propylene oxide with a molecular mass of 4503-5003 and additionally salt dibutylamine fraction of synthetic fatty acids (C10-C13or salt dibutylamine lauric acid C12, 2-ethylhexanol, citric acid or Aerosil and magnesium oxide in the following ratio, wt. including :

The copolymerization product of glycerine and propylene oxide with a molecular mass of 4503-5003 - 100

Toluylenediisocyanate - 9,9-12,1

Glycidol - 4,1-5,2

Salt dibutylamine fraction of synthetic fatty acids (C10-C13or salt dibutylamine lauric acid12- 0,002-0,009

2-Ethylhexanol - 2,5-3,0

Citric acid or - 0,04-0,05

Aerosil - 0,4-0,5

Magnesium oxide - 0,01-0,015

 

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FIELD: organic chemistry, polymer materials.

SUBSTANCE: polyester-polyols are obtained by double metalcyanide catalyzed polyaddition of alkylenoxide to starting material containing active hydrogen atoms. Alkylenoxide is continuously fed into reactor during induction period while maintaining constant pressure in reactor.

EFFECT: method for polyester-polyol production with decreased induction time.

2 ex, 1 dwg

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