CN102942700B - Preparation technology of modified asphalt by adding stabilizer at later stage - Google Patents
Preparation technology of modified asphalt by adding stabilizer at later stage Download PDFInfo
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- CN102942700B CN102942700B CN201210423089.3A CN201210423089A CN102942700B CN 102942700 B CN102942700 B CN 102942700B CN 201210423089 A CN201210423089 A CN 201210423089A CN 102942700 B CN102942700 B CN 102942700B
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Abstract
The invention discloses a preparation technology of a modified asphalt by adding a stabilizer at later stage, characterized by dividing heated molten matrix asphalt into two parts, wherein most matrix asphalt is used as the matrix asphalt added at earlier stage, and a small part of the matrix asphalt is used as the matrix asphalt added at later stage; then adding a modifier, a compatilizer and the matrix asphalt added at earlier stage in a mixing tank to uniformly mix to obtain a swelling system, processing the swelling system by using a colloid mill, then sending the processed swelling system into the tank to stir for developing; after the swelling reaction of the matrix asphalt added at earlier stage and the modifier is stable, adding the matrix asphalt added at later stage and the stabilizer, continuing to stir to develop to obtain the modified asphalt. According to the invention, there is no false liquid level occurred in the mixing tank during the production process, there is no local sharp reaction occurred, there is no block that is difficult to be molten, thus the production efficiency is better than existing technology of synchronous adding agents, and the quality of the modified asphalt is good.
Description
Technical field
The present invention relates to a kind of preparation technology of the modifying asphalt at rear interpolation stablizer.
Background technology
Modifying asphalt is to be formed through being mixed with by the component including matrix pitch, properties-correcting agent, compatilizer and stablizer.The production of current modifying asphalt is to adopt synchronously to add agent technique, the production process of this technique is: heat-conducting oil furnace is exported to oil temperature and rise to 220 ℃, be heated to 200 ± 5 ℃ Deng matrix pitch, set the frequency that feeds intake of properties-correcting agent, compatilizer and stablizer, and the charging frequency of matrix pitch and the liquid level of mixing tank.Then, change logical matrix pitch and enter products pot flow process, after matrix pitch, properties-correcting agent, compatilizer and stablizer are added simultaneously and are uniformly mixed in mixing tank by formula, squeeze into finished pot through colloidal mill and carry out pitch growth.Treat to have fed intake by production task, in finished pot, pitch is grown qualified rear product export.
But, in actual production, synchronously add the more problems that agent technique exists, main manifestations is: (1) mixing tank circle position is controlled unstable: because mixing tank liquid level is for automatically controlling, while synchronously adding agent, properties-correcting agent reacts huge strong with matrix pitch with stablizer, forms one by one little agglomerate, under the effect of stirrer, these little agglomerates can be attached on liquidometer, cause falsity water level to occur.Matrix pitch is to carry out charging according to level condition, once there is falsity water level, will cause and interrupt the interpolation of matrix pitch, and properties-correcting agent and stablizer also adds continuing, and can cause like this materials from bonding, causes producing discontinuous, has at any time stifled mill risk; (2) the too low asphalt viscosity of temperature of producing is larger, and adds agent excessive velocities, and stirring, pump circulation do not open and stir bad in the situation that, modifying asphalt generation local reaction, forms the agglomerate that is difficult to melting, directly affects modifying asphalt quality.Cause modified bitumen product second-rate, main manifestations is: softening temperature is low, ductility is low, viscosity is large.(3) modifying asphalt enters after products pot, needs to start at least two group stirrers and stirs, and energy consumption is larger.(4) owing to being synchronously to add agent, after properties-correcting agent, stablizer and compatilizer mix with pitch, increased the viscosity of mixture, these mixtures are along with the carrying out of production process, can remain in above liquidometer, and can not take away with pitch, can make like this liquidometer falsity water level of appearing.(5) stablizer is powdery, adds moment at stablizer, with pitch generation vigorous reaction, causes in the process of blanking with in stirrer stirring and occurs " flying upward " situation.
Summary of the invention
The object of this invention is to provide a kind of preparation technology of the modifying asphalt at rear interpolation stablizer, this technique there will not be falsity water level phenomenon in mixing tank in process of production, can there is not local vigorous reaction yet, do not form the agglomerate that is difficult to melting, production efficiency is better than existingly synchronously adding agent technique, and modifying asphalt quality is good.
The object of the invention is to realize by following technical measures: a kind of preparation technology of the modifying asphalt at rear interpolation stablizer, the matrix pitch of heating and melting is divided into two portions, the matrix pitch that most of matrix pitch was wherein thrown in as early stage, the matrix pitch that small portion matrix pitch was thrown in as the later stage, then by properties-correcting agent, compatilizer adds in mixing tank and is mixed into and melts swollen system with the matrix pitch of throwing in early stage, describedly melt swollen system and after milling treatment of colloid, send in products pot to stir and grow, matrix pitch and the properties-correcting agent thrown in until early stage melt after swollen reacting balance, add the matrix pitch of stablizer and later stage input, continue to stir to grow and obtain modifying asphalt.
In the preparation of modifying asphalt, matrix pitch and properties-correcting agent mixing are melted swollen reaction formation and are melted swollen system, compatilizer can improve the stability of the combination between matrix pitch and properties-correcting agent, can there is chemical stabilization with matrix pitch and properties-correcting agent and react in stabilizer, to improve the modified effect of pitch.Between matrix pitch and properties-correcting agent, do not have chemical reaction to occur, it melts swollen reaction is pure physical process, and the viscosity of melting swollen system is relatively little, is conducive to stir, and system is easily uniformly dispersed, and is also conducive to melting of properties-correcting agent swollen.Therefore, matrix pitch and properties-correcting agent mix melt swollen during, even if device or agitation cycle equipment break down, also can not cause too large impact to follow-up, after fault solves, still can make matrix pitch and properties-correcting agent obtain good dispersion effect.Visible, can adopt in theory matrix pitch, properties-correcting agent and compatilizer to mix to melt swollenly to add again the explained hereafter modifying asphalt of stablizer after steadily, and can solve and synchronously add the problem that agent technique exists.But contriver finds in actual production operation, when add stablizer in the swollen system of melting of matrix pitch and properties-correcting agent time, can occur on mixture surface a large amount of cakings, and tank boil-overs occurs soon, can not reach on the contrary modification object.Trace it to its cause, that properties-correcting agent is while mixing with matrix pitch, properties-correcting agent absorbs light constituent in pitch and melts swollenly in the time of certain temperature, and mixture viscosity is increased, and adds afterwards stablizer, because stablizer reacts very violent with matrix pitch, stablizer and matrix pitch point of contact can form blister, if add stablizer excessive velocities or feed intake inhomogeneous, part can cause reaction overrun, and mixing tank volume is less, just easily there is tank boil-overs and form caking at mixture outside surface.In addition, because stablizer is powdery, if directly input easily causes dust from flying, and stablizer also should not stir in mixture, thereby matrix pitch is divided into two portions adds, early stage with most of matrix pitch first mix with properties-correcting agent melt swollen extremely steady, the carrier of later stage using remaining matrix pitch as stablizer, add together with stablizer in mixture, can allow stablizer can fully mix with mixture, avoid the problem of the too fast tank boil-overs causing of local reaction and caking.
In the present invention, take the total mass of modifying asphalt as benchmark, described properties-correcting agent addition is 3.5 ~ 5%, and described stablizer addition is 0.1 ~ 0.3%, and described compatilizer addition is 0 ~ 1%.
In the present invention, the ratio between the matrix pitch that throw in described early stage and the matrix pitch of later stage input is 3:1 ~ 9:1, is preferably 3:1 ~ 6:1, and the best is 3:1 ~ 5:1.
As a modification of the present invention: control described later stage matrix pitch and add flow velocity within the scope of 35 ~ 40 tons/hour, the input frequency of described stablizer is within the scope of 15Hz ~ 20Hz.In this scheme, control the input frequency of flow velocity and the stablizer of later stage matrix pitch, can make stablizer be evenly distributed in later stage matrix pitch, and then stablizer can fully be mixed with mixture, further avoid the problem of the too fast tank boil-overs causing of local reaction and caking.
In the present invention, add the matrix pitch that stablizer and later stage throw in after development time more than 8 hours, preferred development time is 8 ~ 24 hours, more preferably, is 8 ~ 12 hours.
The present invention can also do following improvement: the input frequency 25Hz ~ 28Hz of described properties-correcting agent, compatilizer is thrown in by the speed of 0.5 ~ 2 ton per hour, matrix pitch charging in early stage frequency 28 ~ 35Hz.
In the present invention, described stablizer described early stage matrix pitch and properties-correcting agent grow after melting swollen 4 ~ 5 hours and add.
In the present invention, adopt colloidal mill to grind mixture, in operation, should control colloidal mill temperature out within the scope of 190 ~ 205 ℃, be preferably 190 ~ 200 ℃, both can meet properties-correcting agent melting, can accelerate matrix pitch again and properties-correcting agent reacts, make once grinding technology can meet modifying asphalt quality index, and can guarantee performance of modified bitumen.
In the present invention, control the developmental temperature of described products pot within the scope of 185 ~ 200 ℃, be preferably 190 ~ 200 ℃.
In the present invention, the matrix pitch relating to, properties-correcting agent, compatilizer and stablizer are not limited, technique provided by the invention can be used for the modification of any pitch, and can reach the excellent modification object of expection, meet I-D polymer modified asphalt technical requirements (JTG F40-2004).Therefore, described matrix pitch is various pitch, comprises road bitumen, the heavy contaminated product of Sha Zhongsha, Sha Zhongyi heavy contaminated product, Yi Chong Suo Lushi contaminated product or Kuwait's residual oil etc.Described properties-correcting agent is all properties-correcting agent that are suitable for asphalt modification, comprises high mountain YH791H, Maoming F501 etc.Described compatilizer is all compatilizers that are suitable for asphalt modification, comprises that subtracting four lines extracts oil out.Described stablizer is all stablizers that are suitable for asphalt modification, comprises stablizer BHS-2, the BHS-2A of Beijing Shi Keyuan.
The present invention compared with prior art has following unusual effect:
(1) technique of the present invention is reasonable, and in actually operating, operation of equipment stationarity significantly improves, and flexibility of operation is also improved.
Matrix pitch is divided into two portions point two stages interpolations, early stage only get properties-correcting agent, compatilizer and most of matrix pitch mix melt swollen, the viscosity of melting swollen system of gained is little, easily disperse, there will not be in operation the problem such as falsity water level, stifled mill, even if run into mixing tank and grinding tool fault, after equipment restarts after fixing a breakdown, also can easily make to melt swollen system and be uniformly dispersed.Add again stablizer and remainder matrix pitch fully melting after swollen, and stablizer interpolation together with matrix pitch can be avoided stablizer and melt the inhomogeneous caking causing of contacting of swollen system and tank boil-overs.
(2) the modified bitumen product index of gained of the present invention is good: softening temperature is high, ductility is long, modest viscosity, good stability, and after stablizer adds, 8 hours indices can reach I-D polymer modified asphalt technical requirements (JTG F40-2004).
(3) the present invention is fully melted after swollen and is added stablizer to carry out chemical stabilization reaction again at properties-correcting agent, can give full play to the service efficiency of properties-correcting agent and stablizer, not only the time of stabilization also can correspondingly foreshorten to 8 ~ 12 hours, enhance productivity, but also can reduce properties-correcting agent and stablizer consumption, be conducive to reduce costs.
Accompanying drawing explanation
Fig. 1 is process flow sheet provided by the invention.
Embodiment
Set forth in further detail by the following examples content of the present invention, but following embodiment is just for setting forth content of the present invention, rather than restriction, therefore any change in implication and the scope suitable with claims of the present invention, all should think to be included in the scope of claims.
In following examples, adopt U.S. Dao Weisi modifying asphalt suite of equipment, approximately 25 tons/hour of production rate.Heat conducting furnace is exported to oily temperature and rise to 220 ℃, the temperature for the treatment of matrix pitch is heated to 200 ± 5 ℃, matrix pitch is divided into two portions, the matrix pitch that most of matrix pitch was wherein thrown in as early stage, the matrix pitch that remaining matrix pitch was thrown in as the later stage, wherein, the matrix pitch that throw in early stage, properties-correcting agent and compatilizer add in mixing tank by formula, be mixed into and melt swollen system, the frequency that feeds intake of properties-correcting agent is 25Hz ~ 28Hz, phase solvent is thrown in by 1 ton (1T/h) per hour, the charging frequency of the matrix pitch of throwing in early stage is that 28Hz ~ 35Hz and mixing tank liquid level are 50% ~ 57%.Melt swollen system and after milling treatment of colloid, squeeze in products pot, 190～205 ℃ of colloidal mill temperature outs, 185～200 ℃ of products pot developmental temperatures.The stirrer of opening product tank skin in the time that products pot liquid level reaches 1.2 meters stirs, after properties-correcting agent and compatilizer in adding formula, melt swollen system and in products pot, stir growth after 4 ~ 5 hours, melt and in swollen system, add stablizer and remaining matrix pitch, the matrix pitch charging flow velocity that later stage throws in is 35 ~ 40 tons/hour (T/h), the input frequency of stablizer is 15 ~ 20Hz, after mixing, grows after qualified and dispatch from the factory in products pot.
The matrix pitch that following examples adopt is road bitumen AH-70,70B, and properties-correcting agent adopts high mountain YH791H or Maoming F501, and compatilizer adopts and subtracts four lines extraction oil, and stablizer adopts BHS-2A or BHS-2.
Table 1: embodiments of the invention processing parameter
Table 2: the performance analysis data of modifying asphalt of the present invention
Table 3: comparative example processing parameter
Table 4: the performance analysis data of the modifying asphalt of comparative example
Table 5: the comparative illustration of technique of the present invention and prior art processes
Claims (2)
1. the preparation technology at the modifying asphalt of rear interpolation stablizer, it is characterized in that, heating and melting matrix pitch is divided into two portions, the matrix pitch that most of matrix pitch was wherein thrown in as early stage, the matrix pitch that small portion matrix pitch was thrown in as the later stage, then by properties-correcting agent, compatilizer adds in mixing tank and is mixed into and melts swollen system with the matrix pitch of throwing in early stage, describedly melt swollen system and after milling treatment of colloid, send in products pot to stir and grow, matrix pitch and the properties-correcting agent thrown in until early stage melt after swollen reacting balance, add matrix pitch and the stablizer of later stage input, continue to stir to grow and obtain modifying asphalt, described later stage matrix pitch adds flow velocity within the scope of 35 ~ 40 tons/hour, and the input frequency of described stablizer is within the scope of 15Hz ~ 20Hz.
2. the preparation technology of the modifying asphalt at rear interpolation stablizer according to claim 1, is characterized in that, the ratio between the matrix pitch that throw in described early stage and the matrix pitch of later stage input is 3:1 ~ 9:1.
3. the preparation technology of the modifying asphalt at rear interpolation stablizer according to claim 1, is characterized in that, described stablizer described early stage matrix pitch and properties-correcting agent grow after melting swollen 4 ~ 5 hours and add.
4. the preparation technology of the modifying asphalt at rear interpolation stablizer according to claim 1, is characterized in that, adds after the matrix pitch and stablizer of later stage input, continues to grow within 8 hours, to obtain above modifying asphalt.
5. the preparation technology of the modifying asphalt at rear interpolation stablizer according to claim 1, it is characterized in that, the input frequency 25Hz ~ 28Hz of described properties-correcting agent, described compatilizer is thrown in by the speed of 0.5 ~ 2 ton per hour, described matrix pitch charging in early stage frequency 28Hz ~ 35Hz.
6. the preparation technology of the modifying asphalt at rear interpolation stablizer according to claim 1, is characterized in that, controls colloidal mill temperature out within the scope of 190 ~ 205 ℃.
7. the preparation technology of the modifying asphalt at rear interpolation stablizer according to claim 1, is characterized in that, controls the developmental temperature of described products pot within the scope of 185 ~ 200 ℃.
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| CN104560089B (en) * | 2013-10-22 | 2017-02-01 | 中国石油化工股份有限公司 | Method for producing asphalt with high softening point |
| CN104560086B (en) * | 2013-10-22 | 2017-02-01 | 中国石油化工股份有限公司 | Preparation method for asphalt with high softening point |
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| CN101508848A (en) * | 2009-03-18 | 2009-08-19 | 广州路翔股份有限公司 | Modified emulsified asphalt, production method and CA mortar comprising the emulsified asphalt |
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| CN101508848A (en) * | 2009-03-18 | 2009-08-19 | 广州路翔股份有限公司 | Modified emulsified asphalt, production method and CA mortar comprising the emulsified asphalt |
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