Polyurethane composition

FIELD: polyurethane composition based on oligoester polyisocyanate.

SUBSTANCE: claimed composition contains (mass parts): mixture of low molecular oligooxyethylene glycol and oligooxypropylenetriol 49.0-91.2; toluylenediisocyanate 8.0-40.5; dimethyl dichlorosilane 0.1-1.0; and low molecular polyethylene 2.5-11.5, wherein polyethylene is introduced when content of isocyanate group NCO- is achieved of predetermined value (2.0-10.5 mass %).

EFFECT: oligoester polyisocyanate with stable characteristics under long-term (up to 6 months) storage.

6 ex, 1 dwg

 

The invention relates to 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. 103137-78). This composition ensures 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 a polyisocyanate prepolymer [Prit, Acoming, Polyurethane elastomers, Publishing Chemicals, p.116, 1973]. This prepolymer is a rapid change in the content of isocyanate groups, which complicates the use of the prepolymer as component polyurethane compositions of cold hardening.

Known polyurethane-based components oligomerisation obtained by mixing oligopyrroles with polyisocyanate, by treatment of a solution of low molecular weight oligodendroglioma in oligoamenorrhea the diisocyanate [the Patent of Russian Federation №2073027, C 08 G 18/12, 20.03.98, bull. No. 8, (prototype)]. It is recommended to increase the stability of oligomerisation under certain appropriate is osenia source polyols, used in the synthesis together with the diisocyanate (TDI).

Known oligomerisation obtained by processing a 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.

An object of the invention is to stabilize the properties of oligomerisation (polyurethane components) in their long-term storage.

The goal of the project is achieved in that the composition to obtain a polyurethane-based component oligomerisation includes oligoarticular is a mixture of low molecular weight oligodendroglioma with oligoamenorrhea, toluylenediisocyanate, clear and low molecular weight polyethylene, which is injected when the preset content of the isocyanate NCO groups of 2.0 to 10.5 wt.%, during processing of these oligopyrroles toluylenediisocyanate in the presence of a clear in the following ratio of components is having parts by weight of:

the mixture of low molecular weight oligoastrocytoma

or oligodendroglioma with oligoamenorrhea

49,0-91,2

toluylenediisocyanate 8,0-40,5

the clear 0,1-1,0

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

The technical result is illustrated in the drawing, which shows the dependence of the content of isocyanate groups in the process of long-term storage of the product (polyurethane component) in a sealed plastic container filled three quarters of the volume (line 1 - in the presence of low molecular weight polyethylene, line 2 - no low-molecular-weight polyethylene).

Dependencies are presented for different initial values of the percentage of isocyanate groups. Sampling was performed with a syringe.

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 from 2.5 to 11.5 wt.%.

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 resulting finished prepolymer ranges from 2 to 9.6 wt.%.

One example of application of the developed compositions are self-leveling floors, high wear what tolkosto, resistance to aggressive environments. Another example is corrosion-resistant coating for metal surfaces with the introduction of a mixture of low molecular weight polyethylene.

Example 1. In a reactor were placed 9 mass parts of toluylene diisocyanate (TDI) and with stirring was added a solution consisting of 90 mass parts olivocerebellar (6000 mm), 1.2 wt. part of oligoastrocytoma (500 mm) and 1 wt. part clear. Upon reaching the content in the reaction mass of isocyanate groups (NCO 2.5 wt.% contributed to 2.6 wt. part of the low-molecular-weight polyethylene. The process continued until the content of group - NCO 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 solution consisting of 61 wt. parts olivocerebellar (4500 mm), 19 wt. part of oligoastrocytoma (500 mm) and 0.7 wt. part clear. Upon reaching the content in the reaction mass of isocyanate groups (NCO to 6.0 wt.% made of 4.5 wt. part of the low-molecular-weight polyethylene. The process continued until the content of group - NCO 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 to dissolve the, consisting of of 30.5 wt. parts olivocerebellar (4500 mm), 39 wt. part of oligoastrocytoma (500 mm) and 0.5 wt. part clear. Upon reaching the content in the reaction mass of isocyanate groups (NCO to 9.5 wt.%. Made of 7.5 wt. part of the low-molecular-weight polyethylene. The process continued until the content of group - NCO of 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 olivocerebellar (4500 mm), 56 wt. part of oligoastrocytoma (500 mm) and 0.1 wt. part clear. Upon reaching the content in the reaction mass of isocyanate groups (NCO to 10.5 wt.%. Made of 11.5 wt. parts low molecular weight polyethylene. The process continued until the content of group - NCO of 9.6 wt.% in the calculation of the net oligomerisation (calculation gives being 9.61 wt.%).

Example 5. The reactor is placed to 9.0 wt. parts of toluylene diisocyanate (TDI) and with stirring the mixture (solution)consisting of a 90.0 wt. parts olivocerebellar (6000 mm) and 1.2 wt. parts of oligoastrocytoma (500 mm) and 1 wt. part clear.

When the preset content in the reaction mass (mixture) of isocyanate groups (NCO 2.5 wt.% contributed to 2.6 wt. part discobole warnowo polyethylene. The process continues until the content of group - NCO 2.1 wt.% in the calculation of the net oligomerisation (prepolymer).

Example 6. 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 olivocerebellar (4500 mm), 56 wt. part of oligoastrocytoma (500 mm).

Get product - component polyurethane containing group NCO of 9.6 wt.% in the calculation of the net oligomerisation (prepolymer).

Composition component polyurethane based oligomerisation comprising a mixture of low molecular weight oligodendroglioma with oligoamenorrhea, toluylenediisocyanate, clear, characterized in that it contains a low molecular weight polyethylene, which is injected when the preset content of NCO-groups of 2.0 to 10.5 wt.%, during processing of the mixture of low molecular weight oligodendroglioma with oligoamenorrhea a diisocyanate in the presence of a clear, in the following ratio of components, parts by weight:

a mixture of low-molecular

oligoastrocytoma

oligoamenorrhea 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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