Method for production of oligoester polyisocyanate

FIELD: method and composition for production of oligoester polyisocyanate useful as component of polyurethane compositions.

SUBSTANCE: invention relates to method for production of oligoester polyisocyanate treated with toluylenediisocyanate. Method includes controlling of NCO-group content up to predetermined value followed by addition of low molecular polyethylene. Oligoester polyisocyanate of present invention is useful as component of polyurethane compositions for production of cold cured articles.

EFFECT: reaction mass with increased viability for long storage time.

6 ex, 1 dwg

 

The invention relates to manufacturing methods and formulations of the components of the polyurethane compositions according to the technology, based on a mixture of oligopyrroles with toluenediisocyanate (TDI).

Currently, for the manufacture of a wide range of products applied polyurethane composition based prepolymer SKU-PFL-100 (TU 38.103137-78). This composition provides a complex of high physical-mechanical and operational characteristics of the finished polyurethane materials in the products, but is not suitable for the manufacture of large-sized products. For the manufacture of a wide range of products used the polyisocyanate prepolymer. Prit, Acoming, Polyurethane elastomers. Publisher Chemistry, p.116, 1973, Such a method of producing prepolymers leads to a rapid change in the content of isocyanate groups of crystallization and complicates the use of the prepolymer as component polyurethane compositions of cold hardening.

Known methods for producing oligomerisation by mixing oligopyrroles with polyisocyanate. The patent of Russian Federation №2073027, C 08 G 18/08, 20.03.98, bull. No. 8 (prototype). It is recommended to increase the stability of oligomerisation when a certain ratio of the original polyols used in the synthesis together with the diisocyanate (TDI).

And the known method of obtaining oligomerisation, includes treatment of the mixture of oligoarticular and oligoastrocytomas-diisocyanate (TDI). THE 2294-030-17187505-98, component polyurethane “Germoplasm OP-1”, sheet 2. Warranty period of storage component is according to THE six months. However, the reduction of the content of isocyanate groups is from date of manufacture, and after six months there has been a dramatic increase in viscosity, formation of clots and films.

This invention eliminates the drawbacks and prototype.

An object of the invention is to increase the stability properties of oligomerisation during their long storage.

The goal of the project is achieved in that in the method of obtaining oligomerisation by mixing oligopyrroles with the diisocyanate and the subsequent introduction of low molecular weight polyethylene as oligopyrroles use a mixture of low molecular weight oligodendroglioma or oligoastrocytoma with oligoamenorrhea, processing of oligopyrroles the diisocyanate is carried out in the presence of a clear, control the content of isocyanate NCO groups to the estimated value, followed by the introduction of low-molecular-weight polyethylene and continue the process until the content of isocyanate NCO-GRU is p in the resulting prepolymer from 2.0 to 9.6 wt.% in the following ratio of the initial components in parts by weight:

a mixture of the above

oligopyrroles 49,0-91,2

toluylenediisocyanate 8,0-40,5

the clear 0,1-1,0

low-molecular-weight polyethylene 2,5-11,5.

The essence of the invention and the technical result is illustrated in the drawing, which shows the dependence of the content of isocyanate groups with long-term storage of the product in a sealed plastic container filled three quarters of the volume (1 - in the presence of low molecular weight polyethylene, 2 - without low-molecular-weight polyethylene). Sampling is carried out with a syringe.

When implementing the method of the mixture of prepolymers was obtained by treatment of a solution of a mixture of oligoastrocytoma or oligodendroglioma in oligoamenorrhea a diisocyanate. These dependencies are presented in four versions of the content of isocyanate groups in the beginning of storage. In the process of synthesis of the prepolymers were added low-molecular-weight polyethylene (manufactured in accordance with TU 6-05-361-9-79, type G) in an amount of 2.5 to 11.5 parts by weight of the Initial process temperature of the mixture was 30°With, in the real world (natural heat exchange, reaction time 5 hours) the temperature of the reaction mixture did not exceed 85°C. the contents of the specified number of isocyanate groups in the prepolymer ranges from 2 to 9.1%. One example of application of the developed compositions is the presence of the major flooring which have high wear resistance, resistance to aggressive environments.

Example 1. In a reactor were placed 9 parts by weight of toluylene diisocyanate (TDI) and with stirring was added a mixture solution composed of 90 wt. parts olivocerebellar (6000 mm), 1.2 wt. part of oligoastrocytoma (500 mm) and 1 mass. part clear. Upon reaching the content in the reaction mass of the isocyanate groups of the NCO 2.5 wt.% contributed to 2.6 wt. part of the low-molecular-weight polyethylene. The process continued until the content of NCO groups of 2.1 wt.% in the calculation of the net oligomerisation (calculation gives 2,08 wt.%).

Example 2. In a reactor were placed 20 wt. parts of toluylene diisocyanate (TDI) and with stirring was added a mixture solution composed of 61 wt. parts olivocerebellar (4500 mm), 19 wt. parts of oligoastrocytoma (500 mm) and 0.7 wt. parts clear. Upon reaching the content in the reaction mass of the isocyanate groups of the NCO to 6.0 wt.% made of 4.5 wt. parts low molecular weight polyethylene. The process continued until the content of NCO groups to 5.0 wt.% in the calculation of the net oligomerisation (calculation gives 5,09 wt.%).

Example 3. In a reactor were placed to 30.5 wt. parts of toluylene diisocyanate (TDI) and with stirring was added a solution consisting of up to 30.5 wt. parts olivocerebellar (4500 mm), 39 wt. parts oligoarticular is Kolya (M.M. 500) and 0.5 wt. parts clear. When the content in the reaction mass of the isocyanate groups of the NCO to 9.5 wt.% made of 7.5 wt. parts low molecular weight polyethylene. The process continued until the content of NCO groups to 7.5 wt.% in the calculation of the net oligomerisation (calculation gives 7,49 wt.%).

Example 4. In a reactor were placed 40,5 wt. parts of toluylene diisocyanate (TDI) and with stirring was added a solution consisting of 3.5 wt. parts oligoamenorrhea (4500 mm), 56 wt. parts of oligoastrocytoma (500 mm) and 0.1 wt. part clear. Upon reaching the content in the reaction mass of the isocyanate groups of the NCO to 10.5 wt.% contributed to 11.5 mass parts low molecular weight polyethylene. The process continued until the content of NCO groups of 9.6 wt.% in the calculation of the net oligomerisation (calculation gives being 9.61 wt.%).

Example 5. The reactor is placed to 30.5 parts by weight of toluylene diisocyanate (TDI), was added with stirring a solution consisting of a mixture of 30.5 parts by weight of oligoamenorrhea (4500 mm) and 39.0 parts by weight of low molecular weight oligodendroglioma (500 mm), and 0.5 parts by weight of clear. When the content in the reaction mass isocyanate NCO groups of 9.5% contribute to 7.5 parts by weight of low-molecular-weight polyethylene. The process continued until the content of isocyanate NCO groups ~7.5 wt.% in the final prepolymer in the calculation of the net oligomerisation.

<> Example 6. The process is carried out analogously to example 1, but as oligopyrroles a mixture of 90 parts by weight of oligoamenorrhea and 1.2 parts by weight of oligodendroglioma (500 mm). Get oligomerisation (prepolymer) with a content of isocyanate NCO groups of 2.1 wt.% in the calculation of the net oligomerisation.

The method of obtaining oligomerisation by mixing oligopyrroles with the diisocyanate and the subsequent introduction of low molecular weight polyethylene, characterized in that as oligopyrroles use a mixture of low molecular weight oligodendroglioma or oligoastrocytoma with oligoamenorrhea, processing of oligopyrroles the diisocyanate is carried out in the presence of a clear, control the content of isocyanate NCO groups to the estimated value, followed by the introduction of low-molecular-weight polyethylene and continue the process until the content of isocyanate NCO groups in the prepolymer of 2.0 to 9.6 wt.% in the following ratio of initial components, parts by weight:

a mixture of the above

oligopyrroles 49,0-91,2

toluylenediisocyanate 8,0-40,5

the clear 0,1-1,0

low-molecular-weight polyethylene 2,5-11,5.



 

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