The method of obtaining modifying additives for polyurethanes

 

(57) Abstract:

The invention relates to the technology of polyurethanes, which can be used as adhesives, paints, construction materials. Describes how to obtain modifying additives for polyurethanes by dissolving the halide of a metal of variable valence in ethanolamine when the molar ratio of the halide metal:ethanolamine 1:5-10, which allows to increase the viability of the 2 times, resistance to abrasion 2-3 times, thermomechanical properties to increase by 20%, to the same physical and mechanical properties such as shore a hardness, tensile strength at break, elastic rebound, and the specific volume resistance remain unmodified sample. table 2.

The invention relates to the chemistry and technology of polymers, namely, to obtain polyurethane elastoplastic and thermoplastic elastomers that may be used as adhesives, paints, construction materials.

Known modifier additive for polyurethane, which is obtained by dissolving chloride divalent copper or ferric chloride in a solvent, see patent RU 2028317, class C 08 G 18/77, C 08 K 3/24, 1995.

The closest in technical essence and the achieved effect is a method for modifying additives for polyurethanes by dissolving the metal halide is chloride divalent copper in a solvent, the solvent used is N, N,-diethylhydroxylamine at a molar ratio of bivalent copper chloride and solvent 1:1, and the modifying additive charge in the amount of 2.5% to 3% by weight of polyurethane, patent RU 2028318, class C 08 G 18/77, 18/22, 79/00, 1995.

The objective of this invention to provide a modifying additive, which increases the resistance to abrasion, thermomechanical properties and viability of polyurethanes, preserving their antistatic and strength properties.

The technical problem is solved by a method of obtaining modifying additives for polyurethanes by dissolving the halide of a metal of variable valence in the solvent, which use a halide of a metal of variable valence, and the solvent take Itachi allows you to increase the viability of the 2 times, abrasion resistance 2-3 times, thermomechanical properties to increase to 20%, to the same physical and mechanical properties, like hardness shore a tensile strength at break, elastic rebound, volume resistivity, remain unmodified control sample.

Characteristics of substances used in the preparation of the modifying additives listed in table 1.

The modifying additive obtained by the claimed method, you can enter as mesh and thermoplastic polyurethanes. In thermoplastic polyurethane additive is introduced as in the stages of its synthesis, and in the finished product, i.e., through its melt or solution, and in mesh only at the stages of its synthesis, as reticulated polyurethane does not melt or dissolve.

The invention is illustrated by the following specific examples:

Example 1. The modifying additive was prepared as follows: take 0,047 g of ferrous chloride copper ul2and dissolved in ethanolamine. The molar ratio of the bivalent copper chloride:ethanolamine is 1:5. Chloride divalent copper is 0.05% by weight of polyurethane, in this example, reticulated polyurethane aromatic isocyanate). Into it enter the modifying additive at a temperature of 80oC, the mixture is stirred under vacuum and the same temperature for 10-15 min, after which the reaction mixture utverjdayut. To this reaction mass is then cooled to 60oWith and with stirring, give it a hardener 13,93 g 3,3,-dichloro-4,4,-diaminodiphenylmethane, then vacuum within 1-2 minutes and pour into molds. For the curing mold with a polymer mass is placed in a heat chamber at a temperature of 80-90oC and maintained for 24 hours. The content of the metal halides in mass with respect to the polyurethane may be 0.05 to 3.0 percent.

Example 2. The method is carried out analogously to example 1, the difference is that the modifying additive is introduced into the polyester.

Example 3. The method of obtaining modifying additives as in example 1 (example of the bivalent copper chloride). To obtain a polyurethane, in this case, thermoplastic elastomer as the original charge 90 g of the prepolymer obtained, for example, the interaction 60 g oligoesterdiol - polyoxyethyleneglycol (M M=1000) and 30 g of 4,4,-diphenylmethanediisocyanate at a molar ratio oligoesterdiol to isocyanate 1:2. In the prepolymer is injected modifying 10-15 minutes then enter the 5.5 g chain extension of 1,4-butanediol (of 1.02 mol), stirred the reaction mass for 1-2 minutes and pour into molds. The form is placed in a heat chamber at a temperature of 90-100oWith in 24 hours.

Example 4. The method is carried out analogously to example 3, the difference is that the modifying additive, representing a solution of dihydride chloride divalent copper in EA when a molar ratio of 1:5, injected directly into oligoamnios, chloride divalent copper is 1.5% by weight of polyurethanes.

Thus, the modifying agent can be used for different composition and structure of polyurethanes.

Testing of physical and mechanical properties of polyurethane elastomers were performed after two weeks of exposure of samples under normal conditions in accordance with state Standards: 263-75 - shore hardness; 270-75 - tear resistance; 6950-75 - ball rebound resilience, %; 426-77 - abrasion, electrical resistivity method Dobrovolsky C. N., Kralovec A. N. "Determination of the specific resistance and the permanent Hall on samples, dual samples van der Bau" // Physics and technics of semiconductors. 1979, 13 so. 2. S. 386-389.

The results of physico-mehana the imps, presented in table 2.

The experimental data shown in the table, using the modifying additive obtained by the present method increases the viability of polyurethanes in 2 times, resistance to abrasion 2-3 times, improve thermomechanical properties of up to 20%, in addition, these physical-mechanical properties, like hardness shore a tensile strength at break, elastic rebound, volume resistivity, remain at the level of the control unmodified polyurethane.

The method of obtaining modifying additives for polyurethanes by dissolving the metal halide in a solvent, characterized in that use a halide of a metal of variable valence, and the solvent used ethanolamine at a molar ratio of the halide metal: ethanolamine 1: 5-10.

 

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13 cl, 3 dwg, 4 tbl

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17 cl, 5 ex, 5 tbl

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