SU1073253A1 - Method for producing stabilized agent for thermoplastics and synthetic rubber - Google Patents

Abstract

METHOD Preparation of a stabilizer for thermoplastics and synthetic rubber processing asphaltenes chemical reagents on t l and h ide w and also with the fact that, in order to simplify cr lady sokrgitseni processing time and increasing stabilieirukvdego effect, the treatment is carried 1vozduhom or oxygen at 100200 ° C for 1-8 h, and then sulfur; : in an inert atmosphere at 180-220 ° C for T5.5-1.5 h.

Description

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The invention relates to the recycling of polymers and can be used to obtain products from stabilized materials in the engineering, electrical, radio and other industries. It is known to use synthetic oxygen-containing compounds for stabilization of polymers (phenol derivatives, etc.), sulfur-containing compounds (aliphatic sulfides, etc.) Most of the stabilizers used tend to volatilize from the polymer mass due to low molecular weight values, resulting in their stabilizing effect weakened. Stabilizers based on sulfur asphaltenes 2j are also known. However, they are not sufficiently effective at high temperatures. The closest to the proposed technical essence and the achieved effect is the method of obtaining an asphaltene-based stabilizer containing in its composition sulfur and nitrogen atoms, which means that asphaltenes are treated with chemical reagents - nitric acid, for example, for 4-12 hours, and then after incubation at room temperature for 12-36 hours with sodium polysulfide at 80-100 ° C for 8-16 hours H. The disadvantages of this method are the use of aggressive and toxic reagents, the need to prepare solutions, the longer preparation process (24 64 hours). In addition, increasing the requirement of industrialization involves the use of more effective stabilizers. The purpose of the invention is to simplify the process, shorten the processing time and increase the stabilization of the effect. The goal is achieved in that according to the method of obtaining a stabilizer for thermoplastics and synthetic plastics by treating asphaltenes with chemical reagents, the treatment is carried out with air or oxygen at 100-120 for 1-8 hours and then with sulfur in an inert medium at 180-220 G for 0.5-1.5 hours. The resulting product is a black, glossy powder, soluble in a wide range of solvents, molecular weight about 2000, content of paramagnetic particles 6, 8, 10. The composition of the product,% s asphaltenes 75-87; sulfur 8-15; oxygen 6-10. Example. 0.5 g of asphaltenes are gradually heated in air in the device - derivatograph from 20 to. 100 ° C for 1 hour. Then the asphaltenes are ground and mixed with 0.05 g of sulfur. The mixture is heated in an ampoule with argon at 200 ° C for 1 hour. The resulting product is dissolved in 15 ml of benzene, filtered and 300 ml of petroleum ether 70-100 are poured into the solution, and a product precipitates. Composition (product 1),%; asphaltenes 87; sulfur 8; oxygen 5. Example 2.O, 5 g of isfaltenes in fine-grained form are oxidized with air for a for 8 hours. Then the oxidized asphaltenes are mixed with 0.1 g of sulfur. The mixture is heated in an ampoule with argon at 180 ° C for 1.5 hours. The resulting product is dissolved in 15 ml of benzene and 300 ml of petroleum ether 70-100 are added to the solution, and a product precipitates. Composition (product II),% s asphaltenes 80; Lera 12; oxygen 8. Example3. About 5 g of asphaltene in a finely milled form is oxidized with oxygen in a vial at 100 ° C for. 2 hours. Then the oxidized asphaltenes are ground with 0.125 g of sulfur. The mixture is heated with a b-ampoule with argon nprf 220®С for 0.5 h. The product obtained is dissolved in 15 ml of benzene and 300 ml of petroleum ether .70-100 is poured into the solution, and the product precipitates. Composition (product 111),% asphaltenes 75; - sulfur 15; oxygen 10. In order to study the stabilizing properties of the obtained products, they are introduced into a different polymer. EXAMPLE 4: 5 g of polymer and 0.05-5 g of stabilizer (which is respectively 0.1-.5% by weight of polymer) is dissolved in 5 ml of benzene; The polymer solution deposited on the glass plate is drawn on the surface. the spirit. The polymer film is separated from the plate and dried under vacuum to constant weight. The crushed polymer film in an amount of 50 mg is heated in a device — a derivatograph of the S a. Atmosphere of air at a heating rate of 5 deg / min. The test results of stabilizers, obtained in examples 1-3 (respectively, products I-III), are shown in the table. For comparison, sulfur-coiled asphechtenes (CAA) with the most effective composition were used,%: asphaltenes 80, sulfur 15, aot 5 (prototype) and industrial stabilizers Neozone (GOST-39-79 / and Bisphenol A (GOST 12138-76). From the table it can be seen that the products obtained on the basis of asphaltenes are not inferior to the prototype according to the predictions (CAA B and in a number of cases exceed it by 7.4-45.1%, this also exceeds industrial stabilizer l.

Using the proposed method simplifies the process of obtaining a stabilizer, eliminates the use of aggressive and toxic reagents, which contributes to safety

labor and preservation of the environment, eliminates the need for preparation of solutions, reduces the time for which the stabilizer is obtained, and also increases the stabilizing effect.

Claims (1)

METHOD FOR PRODUCING A STABILIZER FOR THERMOPLASTES AND SYNTHETIC RUBBERS by treating asphaltenes with chemical reagents, with the exception that in order to simplify the method, reduce processing time, and increase the stabilizing effect, the treatment is carried out with Air or oxygen at 100200 ° C for 1-8 hours, and then sulfur; : in an inert atmosphere at 180-220 ° C for 6.5-1.5 hours >