A method of obtaining a bitumen-polymer composition for roll roofing and waterproofing materials

 

(57) Abstract:

Describes a method of obtaining a bitumen-polymer composition for roll roofing and waterproofing materials by mixing while heating bitumen, polymer, filler, characterized in that the polymer used as the polyethylene, and optionally type plasticizer is a petroleum oil, a mixture is produced in two series set of planetary mixers, each of which is equipped with two agitators: screw and frame, and in the first mixer download bitumen and polyethylene and mix them at a temperature of 160-200C for 90-100 min, then the mixture is pumped to the second mixer, type plasticizer is a petroleum oil and stir the mixture for 15-20 minutes Then add the filling and continue to stir for 15-20 min, and the components are mixed in the second mixer is carried out at a temperature of 140-160C. the Technical result - the development of the technology of mixing the bitumen-polymer binder, providing uniform distribution of the blend components at relatively low temperatures, obtaining high-quality binder, as well as roofing and waterproofing materials based on it. the consider the technological process of preparation of bitumen-polymer binder, consisting of bitumen, polymer, plasticizer and mineral filler, and intended for the manufacture of soft roll roofing and waterproofing materials. Binder is used in combination with a fibrous base, impregnates her, and with both sides forms a coating layer, which is applied to the layer of powder or polymer film to improve the operational characteristics of the material and prevent sticking it in the roll. One of the conditions of good quality roll materials is the homogeneity properties of the binder by volume, which is achieved a uniform distribution of the blend components in the mass. There are various ways of intensification of the process of mixing the bitumen-polymer compositions. Thus, in the patent of the Russian Federation [1] describes a method of mixing in the mixer, bitumen, butyl rubber, plasticizer and filler, in which to improve the quality of mixing in the composition additionally injected phenol or a petroleum resin, in this case, initially carry out the mixing of rubber, resin and silicon dioxide to obtain a homogeneous mass, and then introducing a preheated 170-190oC bitumen with a softening temperature 50oC, the filler is injected before or after the introduction the particular composition administered gossipology resin. The mixing is carried out in a mixer heated at a temperature of 190-210oC and the stirring speed of 500-700 rpm Disadvantages of the considered methods is high enough temperature mixing (up to 210oC) and the introduction of an additional component resin, which complicates the process and increases the cost of the material obtained. The described method [3] preparation of bitumen-rubber binder, in which the purpose of uniform distribution of rubber in the bitumen, kouchakzadeh component is administered in a dissolved state with the subsequent removal of the solvent by heating the binder to 180oC. the Introduction and subsequent removal of solvent complicates the technological process, reduces the security of the process, affects the ecological situation in the workplace. A more uniform distribution of the components can be achieved by increasing the temperature while mixing. The described method [4] , which allows to reduce the viscosity of bitumen, according to which the polyolefin material, preferably polyethylene or polypropylene, and bitumen are mixed and gomolatasout at a temperature of 260-310oC closest to the proposed method of obtaining a bitumen-polymer composition of ablaza prototype. According to the description of this method, to obtain molten bitumen bitumen by heating mixed with polyolefin for dissolution and uniform distribution of the polyolefins in the melt bitumen and continue stirring while heating up until the viscosity of the solution at a given temperature has dropped to values lower than the viscosity of this solution would be at the same temperature immediately after cooking. The mixing is carried out at a temperature of 260-310oC. Mineral filler, such as powdered quartz, heated and heated mixed with astringent. The disadvantage of this method is the high temperature mixing, which complicates the technological process requires considerable energy costs, can lead to degradation of the polymer. Before discharge to the impregnating bath this binder must be cooled, since heated to such a high temperature binder-impregnated with a fibrous base, but will not be able to form a coating layer of low viscosity. In addition, heating of the mineral filler is an additional operation that requires energy expenditure.

The technical object of the present invention was the development of tehnoton at relatively low temperatures, receive high-quality binder, as well as roofing and waterproofing materials based on it.

This goal is achieved by applying the two-stage mixing in two sequentially installed mixers. In the first exercise the mixture of bitumen and polymer: polyethylene at a temperature of 160-200oC. Then double the mixture is pumped to the second mixer, add the remaining components of the plasticizer, which is selected petroleum oil, and mineral filler and mixing continued at a lower temperature 140-160oC. a Satisfactory quality of mixing is obtained by optimal choice of the temperature.

The study of the dependence of the viscosity of the bitumen from the shear stress at different temperatures allowed to choose the temperature blend modes. In the temperature range from 85 to 160oC shows the type of flow curves with weakly pronounced effect anomalies viscosity and high absolute value of viscosity. During subsequent high temperature nature of flow curves change: shows the dependence of viscosity on the load, i.e., implements a truly viscous flow. This can be explained by changes in the structure of the material under Voslau the structure, due to intermolecular interaction. The second temperature range leads to the destruction of spatial contacts, which allows to realize the movement of macromolecules in the direction of flow so that the viscosity varies according to the traditional load-dependent. Temperature 160oC is a critical temperature above which is truly the viscous flow of the material. For mixing bitumen with polyethylene authors selected temperature range 160-200oC, when the intermolecular structure of bitumen destroyed and its low viscosity. In this bitumen polyethylene is easily distributed, the formation of new supramolecular structure of the bitumen-polymer mixture. Lowering the temperature of this mixture reduces the mobility of the structural elements and thus captures the newly formed structure, which must not destroy when further mixed with a plasticizer and a filler, since the last fill interrelations of structures of the cell and do not participate in the formation of the structural grid. The double pumping the mixture from the first mixer to the second and the introduction of cold plasticizer and filler reduce the temperature of the mixture. In the second mixer maintain the temperature of 140-160oC. Improving the s destruction and sheathing, there embrittlement of the bitumen. Lowering the temperature in the second mixer below 140oC is impractical, because the selected temperature ensures optimum viscosity of the mixture after draining it in the impregnating bath, the need for impregnation binder of the fibrous base and forming therein a coating layer.

For mixing the components of a binder selected planetary mixer heated and the two agitators: screw stirrer with speed 48,9 rpm and frame stirrer with a speed of 34.5 rpm And the frame and the screw agitator blades and the angle of attack is aimed at lowering the mixture down. The combination of these mixers moves mixed mass of binder as around an axis parallel to the plane of the bottom of the mixer, and along the axis, i.e., the height of the mixer. The minimum mixing time was determined by the time required for homogeneous mixing. For mixing the bitumen-polymer compositions in the first mixer it is 90 minutes to blend all of the components in the second mixer 30 minutes on the basis of economic and technological feasibility, the authors selected the time limit mixing: for the first mixer 90-100 min, 30-40 min for the second

Army with electric heating and two mixers (auger and frame) load 2000 kg of bitumen of grade bn - 70/30 with temperature 180oC, introducing the polymer-polyethylene in the amount of 125 kg, are mixed at a temperature of 170 - 175oC for 95 min, the mixture is pumped to the second of the same design mixer, add successively 100 kg oil, such as industrial, oil and after 15 - 20 min 700 kg mineral filler, the temperature of the mixture decreased to 140-150oC, stirred for 15-20 min, then the mixture of binder is poured into the treatment tub through which using the system rolls miss pre-dried glass fiber width of 100 cm and a weight of 200 g/m2. Glass fabric, impregnated and coated on two sides astringent passed through a bath with an aqueous suspension of kaolin so that the upper surface of the leaf was covered with a layer of aqueous suspension of kaolin, followed by the bottom side of the sheet overlap with plastic wrap and such material through a system of cooling drums is directed to winding machine and then in the form of rolls in the warehouse. Test samples of binder from the bath showed satisfactory uniformity when applying it on a smooth surface and a high softening temperature method a ring and ball.

A method of obtaining a bitumen-polymer composition for p is Italia, characterized in that the polymer used as the polyethylene, and optionally type plasticizer is a petroleum oil, a mixture is produced in two series set of planetary mixers, each of which is equipped with two agitators: screw and frame, and in the first mixer download bitumen and polyethylene and mix them at a temperature of 160 - 200oWith over 90 - 100 min, the mixture is then pumped to the second mixer, type plasticizer is a petroleum oil and stir the mixture for 15 to 20 minutes, then add the filling and continue to mix for 15 to 20 min, and the components are mixed in the second mixer is carried out at a temperature of 140 - 160oC.

 

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