The method of obtaining anti-static polyurethane

 

(57) Abstract:

Describes how to obtain an antistatic polyurethane, which can be used as antistatic coatings and products, in particular for lining shafts, pulleys and couplings in the textile and paper machines. The method consists in the interaction of iron bromide or chloride of iron or divalent copper in a solvent with 2,4-toluylenediisocyanate, followed by curing by heating curing agent mixture is complex oligoesterdiol with glycerin or oligosaccharides content, wt. %: oligoamnios 99-96%; glycerin or oligopotent 1-4%. The obtained antistatic polyurethane with enhanced hydrolytic stability by increasing the content of the gel, as well as providing high-quality protective coatings. table 1.

The invention relates to the chemistry of polymers, and in particular to a method for producing an antistatic polyurethane, which can be used for the manufacture of anti-static products and coatings, in particular for lining rollers, pulleys and couplings in the textile and paper machines.

A method of obtaining antystatycheskye, the butyl acetate) with 2,4-diisocyanate in a molar ratio of reagents, respectively 1:(5-15) for 1.5-6 hours. The reaction mixture is injected into simple or complex oligoamnios, after which the solvent is distilled off and the reaction mass is heated for 30 minutes at the 12oWith under vacuum, the resulting product is poured into the form [Ed. St-in the USSR, 1071627 But, 1982].

There are also known methods of obtaining antistatic polyurethane by reacting the chloride of divalent copper or ferric chloride with various diisocyanates structure [Patent of Russia 2028317, 1995].

The closest in technical essence and the achieved effect is a method for antistatic polyurethane by reacting the chloride of divalent copper in a solvent and reagent, followed by curing by heating curing agent, where the solvent chloride divalent copper use acetone or tetrahydrofuran, as the reagent is 2,4-toluylenediisocyanate, and as curing agent a simple or complex oligoamnios. The method is realized by the interaction of bivalent copper chloride in a solvent with 2,4-diisocyanate at molar is or complicated oligoamnios. The number of source reagents of bivalent copper chloride, 2,4-toluylene diisocyanate and simple or complex oligoesterdiol for the synthesis of anti-static polyurethane respectively 1,74-3,48 wt.h., 20,90-28,00 wt.h., 100 wt.h. Then the solvent is distilled off and the reaction mass is heated for 30 minutes at 120oWith under vacuum, the resulting product is poured into the form and get polyurethane products [Patent of Russia 2028317 C1, No. 3, line 21-50].

The disadvantages of this method are low gel content (50-55 wt. %) and low hydrolytic stability of the resulting polyurethane materials. These deficiencies cause cracking and destruction of the antistatic polyurethane coatings.

The task of the technical solution is getting a new antistatic polyurethane coatings with enhanced hydrolytic stability by increasing the gel content in the polymer while maintaining the specific volume electric resistance.

The problem is solved by the claimed method of obtaining anti-static polyurethane by reacting the halide of the metal in the solvent with 2,4-diisocyanate and subsequent re is atalla use iron bromide or chloride of iron or divalent copper, and as curing agent a mixture of complex oligoesterdiol with glycerin or oligosaccharides when the content of component (wt.%): oligoamnios - 99-96, glycerin or oligopotent - 1-4.

The introduction of cross-linking agents glycerin or oligosaccharide in complex polyester results in almost completely crosslinked polyurethane antistatic material with a gel content of more than 90 wt.%. As a result, such crosslinked polyurethane material, have a high stability against moisture, oxygen, temperature, etc.

As stability tests under natural conditions require a long time (months, years) we applied the Express methods of measuring hydrolytic stability, lasting several hours. The essence of the method consists in boiling the analyzed sample and determining the content of gel in it. For measure hydrolytic stability of the sample in hours is the time to start reducing the amount of gel in the sample.

The invention is carried out as follows.

Example 1. 2.0 g of ferrous iron bromide dissolved in 5 g of acetone and add 16,06 g of 2,4-toluylene diisocyanate and adipinate (molecular weight 2000) was dissolved in 50 ml of acetone, to the solution was added 2 g of glycerin and stirred for 5 minutes. Then, the resulting mixture was added a solution of bromide of ferrous iron with 2,4-diisocyanate. The reaction mass was stirred at 60oC for 10 minutes under vacuum and then poured into molds. Form with the polymer mass is placed in a heat chamber at 110-120oC and maintained for 24 hours. The gel content in the polymer is 96,1%.

Example 2. The method is carried out analogously to example 1, the difference is the amount of ferrous iron bromide in % by weight complex oligoesterdiol, which is 0.5. The gel content in the polymer is 95%.

Example 3. The method is carried out analogously to example 1, the difference is the amount of ferrous iron bromide in % by weight complex oligoesterdiol, which is 1.0. The gel content in the polymer is 94%.

Example 4. The method is carried out analogously to example 1, the difference is the amount of ferrous iron bromide in % by weight complex oligoesterdiol, which is 2.0. The gel content in the polymer is 96%.

Example 5. The method is carried out analogously to example 1, the difference is in the amount of glycerin in % by weight, W is 6. The method is carried out analogously to example 1, the difference is in the amount of glycerin in % by weight of a complex of the polyester, which is 0.5 g (1 wt.%). The gel content in the polymer is 90.5%.

Examples 7-12. The method according to example 7 is carried out analogously to example 1, the method according to example 8 is similar to example 2, the method according to example 9 is similar to example 3, the method according to example 10 is similar to example 4, the method according to example 11 is similar to example 5, the method according to example 12 is similar to example 6, the difference is that instead of bromide use ferrous iron ferric chloride.

Example 13. The method is carried out analogously to example 1, the difference is that instead of glycerol in a complex polyester enter 5 g oligosaccharide obtained by well-known methods. The gel content in the polymer is 90.5%.

Examples 14-15. The method is carried out analogously to example 13, the difference is in the number of oligosaccharide in % by weight of polyester (see table).

Example 16. Obtaining antistatic polyurethane according to the method prototype. 2.17 g (0,01 mol) of ferrous chloride copper dissolved in 10 ml of acetone and subjected to interaction with 26,10 grams (0.15 mole) of 2,4-toluylene diisocyanate, i.e., when the molar - the lead obtained reaction mixture, the acetone is distilled off and the reaction mass is heated for 30 min at 80oWith under vacuum and then poured into molds. Form with the polymer mass is placed in a heat chamber at 60oC and maintained for 8 hours. Then the temperature increase in a heating Cabinet 110oWith and polymer to withstand the weight of 8 hours.

Characterization of the obtained antistatic polyurethane was carried out according to the following methods.

Volume resistivity according to the method specified in the work Dobrovolsky C. N., Kralovec A. N. //Physics and technics of semiconductors. 1979. So 13. 2. C. 386-389. The content of the gel according to the method Kesaeva A. I. //Physics and chemistry of polyurethanes. Kyiv. 1981. S. 63-67.

Hydrolytic stability was determined by time of hydrolysis of the sample before reduction of the content of the gel material and its changes on the surface. The hydrolysis in the flask with boiling water, equipped with a reflux condenser, where was placed a sample of the material under investigation and after a certain time samples were taken for determination of gel.

The test results of samples antistatic polyurethane obtained by the claimed method and the method prolinea method, above average 45-50%, hydrolytic stability increased 12-17 times compared with samples obtained by the method prototype.

The method of obtaining anti-static polyurethane by reacting metal halides in a solvent with 2,4-diisocyanate, followed by curing by heating curing agent based on a complex polyester, characterized in that the metal halide used iron bromide or chloride of iron or divalent copper, and as curing agent a mixture of complex oligoesterdiol with glycerin or oligosaccharides content, wt. %:

Oligoamnios - 99-96

Glycerin or oligopotent - 1-4

 

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