Polyurethane composition

 

The invention relates to the production of polyurethane elastomers intended for the manufacture of taps, soles and other parts when repairing bottom shoes. Describes a polyurethane composition containing 84,68-84,87 wt.% urethane prepolymer based on a mixture of oligodendroglioma and polyoxyethyleneglycol, and 2,4-2,6-diisocyanate, 0.01 to 0.9 wt.% dioctylphthalate, 0,04-0,043 wt.% citric acid and 3,3’-dichloro-4,4’-diaminodiphenylmethane as hardener (the rest). Optionally, the inventive composition also contains about 0.15 wt.% organic dye nigrosine. The invention allows to obtain a polymer characterized by hardness shore a 96-97 srvc. beats. and tear resistance 127-135 kgf/see table 3.

The invention relates to the production of polyurethane elastomers intended for the manufacture of taps, soles and other parts when repairing bottom shoes.

Known polyurethane composition used in the manufacture of blanks for repair bottom shoes on THE other 84 414-201-83.

The disadvantage of this composition is that the blanks are made of polyurethane type sue or SKU, low wear resistance.

Nabokova composition according to patent No. 2155781 C2, CL 7 08 L 75/04,1998

The composition contains, wt%:

Polimorfny urethane prepolymer SKU-PFL-100 is 56.4-62,2

Urethane prepolymer on the basis of 2.2 mol of 2,4-toluylene isocyanate and 1.0 mol of oligoastrocytoma with a molecular weight of 400 8,6-13,4

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

This composition has a low wear resistance. Hardness shore a - 88-93 srvc. unit

The objective of the invention is to provide a polyurethane composition having increased wear resistance while maintaining other physical and mechanical properties of polyurethane elastomers, reducing the cost of production.

The problem is solved due to the fact that the known composition containing urethane prepolymer and the hardener based on 3,3’-dichloro-4,4’-diaminodiphenylmethane as urethane prepolymer contains a prepolymer based on 1 mole of a mixture of oligodendroglioma with a molecular weight of 1000 and polyoxyethyleneglycol with a molecular weight of 1000 with them a molar ratio of 0.8:0.2 to respectively and (1,8-2,1) mole of 2,4-2,6-toluylene diisocyanate as a curing agent contains 3,3’-dichloro-4,4’-diaminodiphenylamine prepolymer - citric acid in the following ratio, wt.%:

Urethane prepolymer based on 1 mole of a mixture of oligodendroglioma with a molecular weight of 1000 and polyoxyethyleneglycol with a molecular weight of 1000 with them a molar ratio of 0.8:0.2 to respectively and (1,8-2,1) moles of 2,4-2,6-toluylene diisocyanate 84,68-84,87

The dioctylphthalate of 0.01 to 0.9

Citric acid 0.04 to 0,043

The curing agent is 3,3’-dichloro-4,4’

-diaminodiphenylmethane in the form of a melt Else

In addition, the composition may further contain an organic pigment - nigrosine up to 0.15 wt.%.

As part polyurethane composition is used urethane prepolymer on the basis of 1.0 mole of a mixture of oligodendroglioma with a molecular weight of 1000 (Laprol 1052”) THAT 2226-411-05761784-95 and polyoxyethyleneglycol with a molecular weight of 1000 (polifonica) THE 6-02-646-81 when their molar ratio 0,8 (80%): 0,2 (20%) and (1,8-2,1) mole of 2,4-2,6-toluene diisocyanate (T-80) THE 113-00-05761643-17-85 respectively.

As the organic dye in the composition is used reactive dye is nigrosine connection, consisting of six benzene rings with three secondary amines, representing black powder, GOST 9307-78.

As a curing agent (crosslinking agent) of COI is in the hardener used dioctylphthalate (DOP) GOST 8728-88, representing esters of various alcohols and dicarboxylic acids.

As a stabilizer of the prepolymer in the composition used citric acid GOST 908-79.

Manufacturing process of polyurethane composition consists of the following operations:

the synthesis of the urethane prepolymer based on 1 mole of a mixture of 80% oligo-oxopropanenitrile with a molecular weight of 1000 (Laprol 1052) and 20% of polyoxyethyleneglycol with a molecular weight of 1000 (polyphonic), nigrosine, (1,8-2,1) moles of 2,4-2,6-toluylene diisocyanate and citric acid;

- receive melt-hardener;

- enter in the melt dioctylphthalate;

- preparation of a polyurethane composition, pouring it into molds and curing.

The synthesis of the prepolymers produced in the synthesis reactor at a temperature of 70-100C for 4-5 hours, then the shirt is served cold water for cooling the prepolymer to a temperature of 25-30C. Melting hardener produced in the melter at a temperature of (120±2)C. and Then produce a blend of prepolymers and melt, then drain polyurethane in the form.

In the polyurethane composition used expensive polyacetate-etilenglikol import of product is oligodendroglial (“Laprol 1052”) reduces the composition, while maintaining the proper level of specified technical characteristics. However, 100% replacement polyoxyethyleneglycol on oligodendroglial can lead to the transition of the polyurethane composition. When using a mixture of prepolymers based polyoxyethyleneglycol with a molecular weight of 1000 and oligodendroglioma with a molecular weight of 1000, manufactured by 2,4-2,6-diisocyanate (product T-80), two processes (glass formation and crystallization) superimposed on each other, which leads to the decrease of glass transition temperature to minus 20C. This allows the use of this polyurethane composition at low temperatures.

The use of this composition allows to achieve high relaxation properties in a temperature range from minus 20C to + 80C.

The selected molar ratio of polyol to 2,4-2,6-diisocyanate - 1:(1,8-2,1) prevents vitrifying composition.

Given the need of the customers in polyurethane black, work has been done on the selection of the dye black. Chemical formula nigrosine react with the prepolymers and as the aromatic compound is one which the amount of up to 0.15% (in excess of 100% by weight of the prepolymer).

To reduce the glass transition temperature of the polyurethane composition, improve the technological properties of the hardener and the reaction mass in the composition of the added plasticizer is dioctylphthalate (DOP) to 6% (by weight of hardener).

Examples of specific performance are presented in table 1. The test results of the composition shown in table 2. As can be seen from the data (examples 1, 2, 3, 4) are given in tables 1, 2, quality polyurethane composition meets the requirements for it. The polyurethane composition is not inferior to the prototype, and the hardness exceeds counterparts, keeping the elastic properties of the composition.

The composition according to examples 5, 6 from beyond the quantitative values of components does not possess the specified characteristics. This solution was confirmed by conducting pilot testing in the production environment of the Perm plant them. S. M. Kirov.

Claims

1. Polyurethane composition comprising a urethane prepolymer and the hardener based on 3,3’-dichloro-4,4’-diaminodiphenylmethane, characterized in that as urethane prepolymer composition comprises a prepolymer based on 1 mol of the mixture of oligo the Aulnay ratio of 0.8:0.2, a respectively, and 1.8-2.1 mol of 2,4-2,6-toluylene diisocyanate as a curing agent contains 3,3’-dichloro-4,4’-diaminodiphenylmethane in the form of a melt, in addition, the composition further comprises a plasticizer is dioctylphthalate, the stabilizer of the prepolymer - citric acid, in the following ratio, wt.%:

Urethane prepolymer based on 1 mol of the mixture of oligodendroglioma with a molecular weight of 1000 and polyoxyethyleneglycol with a molecular weight of 1000 with them a molar ratio of 0.8:0.2 to respectively and 1.8-2.1 mol of 2,4-2,6-toluylene diisocyanate 84,68-84,87

The dioctylphthalate of 0.01 to 0.9

Citric acid 0.04 to 0,043

The curing agent is 3,3’-dichloro-4,4’ -diaminodiphenylmethane in the form of a melt Else

2. Polyurethane composition under item 1, characterized in that it further contains an organic dye is nigrosine in the amount of up to 0.15 wt.%.

 

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FIELD: chemical industry; production of polymeric structural materials from hermosetting compositions based on polyisocyanurates.

SUBSTANCE: the invention is pertaining to the field of chemical industry, in particular, to production of polymeric structural materials from thermosetting compositions based on polyisocyanurates. The offered composition for production of the polymeric structural materials contains 100 mass % of a low-molecular quick-tenacious polymer with the terminal hydroxyl groups, 22.5-400 mass % of aromatic diisocyanate, 0.08-20 mass % of dimethylbenzylamine, 0.8-20 mass % of epoxydiane resins, 55-30 mass % of acetone, 2.0-22.5 mass % of a high-porous polymeric filler. At that in the capacity of the indicated polymeric filler they use a flexible polyurethane foam or a synthetic felt material (sintepone - synthetic winterizer). From the indicated composition by an industrial method for a short cycle of hot pressing produce polymeric items with a gradient modulus of elasticity (in any given direction) from 3 up to 2000 MPa. At that the material saves its elastic properties at any value of the modulus in the interval of temperatures from -50 up to 120°C, and may be used in shoe industry and tire industry, instrument-making industry and radio industry.

EFFECT: the invention allows to produce polymeric items with a gradient modulus of elasticity in any given direction within 3 up to 2000 Mpa, the material saves its elastic properties at any value of the modulus at temperatures of -50 °C up to 120°C.

3 cl, 5 ex, 1 tbl

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