Polyurethane composition

 

The invention relates to the production of polyurethane elastomers intended for the manufacture of coatings shafts of high-speed paper machines, calender rollers for machines in the production of magnetic tapes, as well as for the manufacture of polyurethane products for various purposes for the aviation and automotive industries. Describes a polyurethane composition containing 76,89-78,77 wt.% polimorfnogo urethane prepolymer based on a mixture of 2 moles of 2,4-2,6-toluylene diisocyanate and 1 mole of a mixture of polyoxyethyleneglycol with a molecular weight of 1000 and oligodendroglioma with a molecular weight of 1000 with them a molar ratio of 0.7:0.3 to, respectively, as well as liquid hardener based on 3,3’-dichloro-4,4’-diaminodiphenylmethane and polyoxyethyleneglycol with a molecular weight of 1000 - rest. The invention allows to reduce the cost of production due to the use of more affordable oligodendroglioma (“Laprol 1052”), you get a polymer characterized by hardness shore a 91-96 srvc. units and tear resistance at 23±2With 83-120 N/mm, tensile strength tensile (23±2C) 42,2 Was 45.6 MPa. 3 table.

And the openings of the shafts of high-speed paper machines, calender rollers for machines in the production of magnetic tapes, as well as for the manufacture of polyurethane products for various purposes for the aviation, automotive industry.

A method of obtaining polyurethane patent No. 2078773 C1, CL 6 C 08 G 18/08, 1997 Polyurethane elastomer described in the patent, consists of a hydroxyl-containing compound is a prepolymer with a molecular mass of 1800-2000 with free hydroxyl groups and a high degree of branching and received by the interaction of 1 mole of polifonica mol. m 1000 from 0.5 to 0.6 moles of 2,4-toluylene diisocyanate with their final molar ratio of 1:1.9 to 2.1 a, respectively, followed by curing a mixture of polyethyleneglycoladipinate mol. m 800 and 3,3’-dichloro-4,4’-diaminodiphenylmethane in the ratio of 0.2:0,68 respectively.

The disadvantage of this composition are low deformation-strength properties, especially hardness shore a - 70-78 srvc. units that do not allow to recommend it for the manufacture of many products maintained under conditions of surface loads.

Closest to the technical essence and the achieved result to the claimed invention is a polyurethane composition according to patent No. 2155781 C2, CL 7 08 L 75/04, 1998 is as the basis of 2.2 mol

2,4-toluylene diisocyanate and 1.0 mole

oligoastrocytoma with molecular weight 400

(Prepolymer 402 f) 8,6-13,4

Liquid hardener based on 3,3’-dichloro-4,4’-diaminodiphenylmethane (diameter X) and polyoxyethyleneglycol when a molar ratio of 0.67:0,33 Else

The disadvantage of this composition are low tensile strength, low hardness. In the composition used expensive imported polyphonic - polyoxyethyleneglycol imported (Germany)

The objective of the invention is to provide a polyurethane composition having high strain-strength characteristics at a reduced cost of production.

The problem is solved due to the fact that the composition containing polimorfny polyurethane prepolymer and a liquid hardener based on 3,3’-dichloro-4,4’-diaminodiphenylmethane and polyoxyethyleneglycol with a molecular weight of 1000, contains a prepolymer based on 2 moles of 2,4-2,6-toluylene diisocyanate and 1.0 mole of a mixture of polyoxyethyleneglycol with a molecular weight of 1000 and oligodendroglioma with a molecular weight of 1000 with them a molar ratio of 0.7:0.3 to respectively in the following ratio, wt.%:

Polimorfny poly is with a molecular weight of 1000 and oligodendroglioma with a molecular weight of 1000 with them a molar ratio of 0.7:0.3 to respectively 76,89-78,77

Liquid hardener based on 3,3’-dichloro-4,4’- diaminodiphenylmethane and polyoxyethyleneglycol with a molecular weight of 1000 Else

As part polyurethane composition is used a prepolymer based on 2 moles of 2,4-2,6-toluene diisocyanate (T-80) THE 113-00-05761643-17-85 and 1.0 mole of a mixture of polyoxyethyleneglycol with a molecular weight of 1000 (polyphonic) THE 6-02-646-81 and oligodendroglioma with a molecular weight of 1000 (Laprol 1052”) THAT 2226-411-05761784-96 when a molar ratio of 0.7 (70 wt.%):0,3 (30 wt.%).

As liquid hardener (crosslinking agent) used a hardener based on 3,3’-dichloro-4,4’-diaminodiphenylmethane (diameter X) THE 6-14-980-84 and polyoxyethyleneglycol (polyphonic) with a molecular weight of 1000 with them a molar ratio of 0.7:0,2.

Manufacturing process of polyurethane composition consists of the following operations:

synthesis of prepolymer on the basis of a mixture of 70% polyoxyethyleneglycol with a molecular weight of 1000 (polifonica) and 30% of oligodendroglioma with a molecular weight of 1000 (Lapola 1051”) and 2,4-2,6-toluene diisocyanate (T-80);

- cooking liquid hardener;

- preparation of the polyurethane composition and discharge it in the form.

Synthesis of the prepolymer is carried out in the reactor Sint stirrer.

After preparation of the prepolymer in the jacket of the reactor is introduced cold water to reduce the temperature of the prepolymer to 25-30C.

Liquid hardener is prepared in a vessel heated, heated to 80-90With payforit and at atmospheric pressure loaded weighed diamete X. Stirring is performed until complete dissolution of diamete X.

Mixing the prepolymer and the liquid hardener is performed at a temperature 24-40S, after which the reaction mass is poured into molds for curing at a temperature of 35-80C.

In the polyurethane composition used expensive polyoxyethyleneglycol imported. The purpose of cheapening the product performed work on a partial replacement of polyoxyethyleneglycol (polifonica) on domestic oligodendroglial (“Laprol 1052”).

During the experimental work it was found that 100% replacement of polyoxyethyleneglycol on oligodendroglial leads to a sharp decrease of the relaxation properties of elastomers. This effect is associated primarily with the glass transition temperature of the polyurethane elastomer as polyurethane elastomer /176.gif">C), therefore their operation under normal conditions is difficult. A series of experiments was optimal molar ratio of polyol in the prepolymer: polyoxyethyleneglycol to oligodendroglial of 0.7:0.3 to respectively while maintaining the physico-mechanical characteristics.

The selected molar ratio of 2:1 between 2,4-2,6-diisocyanate and a mixture of prepolymers due to the need to regulate the hardness of the obtained polyurethane products in the range 91-96 srvc. unit

The claimed range of ratios between 2,4-2,6-diisocyanate and a mixture of polyesters determined experimentally.

Examples of specific performance are presented in tables 1 and 2.

The test results of the composition shown in table 3.

As can be seen from the data (examples 2, 3, 4, 6), are shown in tables 1, 2, 3, quality polyurethane composition meets the requirements for it. The polyurethane composition is not inferior to the prototype, and the hardness exceeds counterparts.

The composition of examples 1 and 5 from beyond the quantitative values of components does not possess the specified characteristics.

Claims

Polyuretha the EOS-4,4’-diaminodiphenylmethane and polyoxyethyleneglycol with a molecular weight of 1000, characterized in that the composition comprises a prepolymer based on 2 mol of 2,4-2,6-toluylene diisocyanate and 1 mol of a mixture of polyoxyethyleneglycol with a molecular weight of 1000 and oligodendroglioma with a molecular weight of 1000 with them a molar ratio of 0.7:0.3 to respectively, in the following ratio, wt.%:

Polimorfny urethane prepolymer based on 2 mol of 2,4-2,6-toluylene diisocyanate and 1 mol of a mixture of polyoxyethyleneglycol with a molecular weight of 1000 and oligodendroglioma with a molecular weight of 1000 with them a molar ratio of 0.7:0.3 to respectively 76,89-78,77

Liquid hardener based on 3,3’-dichloro-4,4’-diaminodiphenylmethane and polyoxyethyleneglycol with a molecular weight of 1000 Else

 

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