RU2218370C1 - Method of production of bitumen-polymeric compositions - Google Patents

Abstract

FIELD: chemical industry; construction materials production. SUBSTANCE: the invention is dealt with the bitumen-polymeric compositions used for making the flexible roofing to waterproof the building foundations and pipelines and with the method to produce the bitumen - polymeric compositions, that includes preliminary melting of bitumen and comminution of polymer, mixing of all ingredients included in the composition. Comminution of polymer (-es) is exercised up to the particles size of d_eqv ≤ 0,012 m, specific time for mixing of a bitumen- polymeric composition makes 1.1-3.6 minutes at the temperature of 140-195 C in a continuous mode. The received mixture is cooled to temperature of 24-55 C and granulated. The granulated material is exposed to a powdering. As the powdering material it is possible to use tale, china-clay and other conventional material. At that intermixing is realized in the screw type rubber masticator, extruder or in any other equipment of similar designation. The method is characterized by a metering of components in kg per a minute: Bitumen 0.120-0.391, a granulate of butadienesterene thermoplastic 0.092-0.300, wastes products of production of synthetic rubbers and latexes 0.033-0.109, chalk 0.028-0.091, waste products of industrial oils 0.005-0.018. EFFECT: continuum of process and production of compositions for high-performance materials. 3 cl, 2 tbl, 3 ex

Description

 The invention relates to methods for producing compositions based on bitumen using polymers and other additives for special purposes. In particular, the method of producing bitumen polymer compositions can be used in the production of various bitumen polymer semi-finished products for compositions used in the construction of soft roofs, waterproofing foundations and pipelines.

 A known method of producing polymer compositions in continuous machines, including intensive deformation and mixing of the ingredients in a worm or two-worm continuous mixer [Koshelev F.F., Kornev A.E., Bukanov A.M. General technology of rubber. - Ed. 4th, rev. and additional - M .: Chemistry, 1978. - 528 p., ill.].

The closest in technical essence and the achieved effect is a method of producing a bitumen-polymer material, which includes placing a thermoplastic polymer on a grate located in the lower part of the mixing apparatus, and forcing plasticizer and bitumen heated through it to 160-200 ^° C, which are fed under the grating, through it through pipes located at an angle of 30-60 ^o to the grate with a speed of 13-20 m ³ / h The resulting mixture is passed through the grate 2-3 times. The preparation time of the material is 1.0-1.5 hours [ed. St. SU 1664804 A1, 07.23.91, cl. C 08 L 95/00, C 04 V 26/26. A method of obtaining a polymer bitumen material].

 The main disadvantage of this method of producing polymer compositions is the inability to carry out a continuous mixing process while maintaining relatively stable process conditions, the relatively low physical and mechanical properties of the resulting polymer compositions, the relatively high energy and time costs of obtaining bitumen polymer compositions.

 The technical problem is the implementation of the mixing process in a continuous mode, with sufficiently stable process parameters, improving the physico-mechanical characteristics of the resulting bitumen-polymer compositions, reducing energy and time costs when they are received.

The stated technical problem is achieved by the fact that in the method for producing a bitumen-polymer composition by mixing bitumen, polymer, mineral filler (chalk), oil pre-heated to melt and granulation of the composition, it is new that the polymer is a mixture of styrene-butadiene thermoplastic elastomer and synthetic waste rubbers and latexes with a Defo viscosity of 2700, crushed to particles with a size of d _equiv ≤0.012 m, industrial oil wastes are introduced as oil, all of the above f ingredients simultaneously, continuously dosed into the extruder, provided that the dosage of bitumen melt is from 0.120 to 0.391 kg / min, the dosage of styrene butadiene styrene thermoplastic elastomer from 0.092 to 0.300 kg / min, synthetic rubber and latex waste from 0.033 to 0.109 kg / min, mineral filler (chalk) from 0.028 to 0.091 kg / min, industrial oil waste from 0.005 to 0.018 kg / min, during a specific time of mixing the ingredients 1.1-3.6 minutes at a temperature of 140-195 ^o C, after the extruder, the resulting mixture is cooled to temperature of 24-55 ^o C and granulated with n isypkoy. In the method for producing bitumen-polymer compositions, it is also new that the extruder is a worm rubber mixer and that the powdering is carried out with talc, kaolin and other generally accepted material.

 The technical result consists in the fact that the implementation of the mixing process in a continuous mode with sufficiently stable operating parameters is achieved, the physicomechanical characteristics of the obtained material are improved, and the energy and time costs of its production are reduced.

 In the table. 1 and 2 show the composition and properties of the composition obtained by the known and proposed methods of preparation.

A method of producing bitumen polymer compositions. Bitumen of grades BNK 90/30 (GOST 9548-74) is heated in a vessel until melt is obtained, DST-30 butadiene styrene thermoplastic elastomer (TU 38.103257-80), wastes from the production of synthetic rubbers and latexes with a viscosity of 2700 are crushed to obtain particles of size d _equiv ≤ 0.012 m. Thus prepared polymers and other ingredients are placed in dispensers. Ingredients taken according to the recipe are simultaneously dosed continuously into a worm rubber mixer (extruder or other equipment of a similar principle of operation). Moreover, the dispensers must be adjusted in such a way as to ensure a dosage of bitumen melt in an amount of from 0.120 to 0.391 kg / min, a dosage of rubber granulate DST-30 from 0.092 to 0.300 kg / min, and waste from the production of synthetic rubbers and latexes from 0.033 to 0.109 kg / min, the dosage of the mineral filler (chalk) is from 0.028 to 0.091 kg / min and the dosage of the waste of industrial oils in an amount of from 0.005 to 0.018 kg / min. The mixing process is carried out at an average temperature of 140-195 ^o C. the Specific mixing time of the bitumen-polymer composition is 1.1-3.6 minutes. After completion of the mixing process, the resulting mixture is cooled to a temperature of 24-55 ^o C and granulated. The obtained granulate is subjected to dusting with talc, kaolin and other generally accepted materials.

 The proposed invention is illustrated by examples.

 Example 1

Bitumen grade BNK 90/30 is heated in a tank until melt is obtained, butadiene-styrene thermoplastic elastomer DST-30 (TU 38.103257-80), wastes from the production of synthetic rubbers and latexes with a viscosity of Defoe 2700 are crushed to obtain particles with a size of d _equiv ≤0.012 m. Prepared thus polymers and other ingredients are placed in dispensers. Taken according to the recipe, the ingredients are simultaneously dosed continuously into the worm rubber mixer. The dosage rate of the ingredients is set so as to provide the necessary specific mixing time for the bitumen-polymer composition, namely, the dispensers must be adjusted in such a way as to ensure a dosage of bitumen melt in an amount of 0.120 kg / min, a dosage of rubber granulate DST-30 of 0.092 kg / min, and synthetic waste products rubbers and latexes 0.033 kg / min, the dosage of mineral filler (chalk) 0.028 kg / min, the dosage of waste industrial oils in an amount of 0.005 kg / min. The mixing process is carried out at an average temperature of 140 ^o C. the Specific mixing time is 3.6 minutes. After completion of the mixing process, the resulting mixture is cooled to a temperature of 39 ^o C and granulated. The obtained granulate is subjected to powdering with kaolin.

 The experimental data for the example are presented in table. 1 and 2.

 Example 2

The preparation of the composition is carried out analogously to example 1, only the specific mixing time in the rubber mixer is 2.5 minutes, the average mixing temperature is 157 ^o C. After the mixing process is completed, the resulting mixture is cooled to a temperature of 55 ^o C and granulated.

 The experimental data for the example are presented in table. 1 and 2.

 Example 3

The preparation of the composition is carried out analogously to example 1, only the specific mixing time in the rubber mixer is 1.1 minutes, the average mixing temperature is 195 ^o C. After completion of the mixing process, the resulting mixture is cooled to a temperature of 24 ^o C and granulated.

The experimental data for the example are presented in table. 1 and 2. Based on the results of the analysis of the obtained experimental data, presented in table. 2, it was concluded that it is more expedient to obtain bitumen-polymer compositions using the proposed production method, which includes preliminary preparation of the polymer by grinding it, obtaining a bitumen melt, and mixing all the components in a worm rubber mixer, extruder, or other equipment with a similar principle of operation. The mixing process is carried out for 1.1-3.6 minutes at a temperature of 140-195 ^o With the subsequent cooling of the composition to a temperature of 24-55 ^o With and its granulation. In addition, dusting of the obtained material with talc, kaolin or other generally accepted materials is carried out.

 Thus, it can be seen from the above data that the proposed method for producing a bitumen-polymer composition makes it possible to obtain a material superior in physical and mechanical characteristics to a material obtained using traditional technologies, and to reduce energy and time costs in its production.

Claims (3)

1. A method of producing a bitumen-polymer composition by mixing bitumen pre-heated to melt, polymer, mineral filler - chalk, extruder oil and granulating the composition, characterized in that the polymer is a mixture of styrene-butadiene thermoplastic elastomer and Defo viscosity synthetic rubber and latex wastes 2700, crushed to particles with a size of d _equiv ≤0.012 m, industrial oil waste is introduced as oil, all of the above ingredients are simultaneously continuously dosed into the extruder ep provided: the dosage of bitumen melt from 0.120 to 0.391 kg / min, the dosage of styrene butadiene styrene thermoplastic elastomer from 0.092 to 0.300 kg / min, the production of synthetic rubbers and latex from 0.033 to 0.109 kg / min, the mineral filler - chalk from 0.028 to 0.091 kg / min, waste industrial oils from 0.005 to 0.018 kg / min, for a specific time of mixing the ingredients 1.1-3.6 min at 140-195 ° C, after the extruder, the resulting mixture is cooled to 24-55 ° C, and granulated with powder. 2. The method according to claim 1, characterized in that the extruder is a worm rubber mixer. 3. The method according to claim 1, characterized in that the dusting is carried out with talc, kaolin and other generally accepted material.

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