CN1259375C - Bentonite composition modified asphalt and its preparing method - Google Patents
Bentonite composition modified asphalt and its preparing method Download PDFInfo
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- CN1259375C CN1259375C CNB2004100691665A CN200410069166A CN1259375C CN 1259375 C CN1259375 C CN 1259375C CN B2004100691665 A CNB2004100691665 A CN B2004100691665A CN 200410069166 A CN200410069166 A CN 200410069166A CN 1259375 C CN1259375 C CN 1259375C
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- bentonite
- wilkinite
- modified asphalt
- asphalt
- composition modified
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Abstract
The present invention relates to bentonite composition modified asphalt which is composed of 94 to 98 portions of base asphalt, 1 to 3 portions of bentonite and 1 to 3 portions of powder styrene-butadiene rubber. The bentomite is at least one of calcium bentonite, sodium bentomite and organic bentonite. A making method of the bentonite composition modified asphalt comprises the following steps: firstly, making raw soil desanding for the bentomite; drying the desanded bentomite; grinding the dried bentomite; sieving the dried bentomite by a sieve of 325 meshes, and then, adding into molten base asphalt; adding the powder styrene-butadiene rubber by slowly stirring; evenly blending by shearing in high velocity. The present invention has the advantages that the method uses home-made asphalt with high wax content as the base asphalt, the bentonite composition modified asphalt is prepared by adding the bentomite and the powder styrene-butadiene rubber and evenly blending by shearing in high velocity. The bentonite composition modified asphalt has the characteristics of stabilization in high temperature, good anti-cracking performance in low temperature, good ageing resistance, etc. The bentonite composition modified asphalt synthetically improves the road performance of home-made asphalt, and can reduce the cost.
Description
Affiliated technical field
The present invention relates to a kind of bentonite composition modified asphalt and preparation method thereof, belong to building material field.
Background technology
With the existing abroad history for many years of polymer modified asphalt, the polymkeric substance that can be used as asphalt modifier also has multiple, generally is divided into rubber-like, resene and rubber tree lipid.Rubber-like properties-correcting agent comprises natural rubber (NR), styrene-butadiene rubber(SBR) (SBR), sovprene (CR), acrylonitrile-butadiene superpolymer (ABR), polystyrene-isoprene copolymer etc., for vulcanized rubber, could make properties-correcting agent after then must regenerating and use.Resene properties-correcting agent is divided into two kinds of thermoset and thermoplastic resins, and the former has ethylene-vinyl acetate copolymer (EVA), polyethylene, polypropylene, polystyrene, polyvinyl chloride, Vinyl Acetate Copolymer etc., and the latter has Resins, epoxy, resol etc.Rubber tree lipid properties-correcting agent has styrene-butadiene-styrene multipolymer (SBS), styrene-isoprene-styrene copolymer-(SIS), SIS hydrogenation modification multipolymer (SEBS), SBS hydrogenation modification multipolymer (SEPS) etc.
Western developed country has begun the research work of polymer modified asphalt, the domestic work of also having carried out polymer modified asphalt as units such as the Ministry of Communications highway scientific research institution, Tongji University, Shanghai Communications Universitys earlier from the sixties in 20th century.Studies show that both at home and abroad, utilize high polymer material that pitch is carried out modification to have the temperature sensitivity that reduces bituminous material, improve softening temperature and improve characteristics such as ageing resistance; As the SBS modifying asphalt, because superior elasticity, the resistance to low temperature of SBS material and at high temperature be plasticity are easy to the pitch blend, make that SBS modifying asphalt unit elongation is 150%, can recover voluntarily after imperial the carrying, structural distortion is had excellent adaptability, obviously improve splitting resistance; But it is granular that the domestic and international SBS finished product of producing is, however the material very high to this plasticity, and even be heated to very high-temperature, its intrinsic elasticity still influences the pitch homogeneity that stirs through repeatedly to a great extent; On the other hand, the SBS modifying asphalt costs an arm and a leg.Use the SBR modifying asphalt, though the low-temperature performance of modifying asphalt is improved significantly, not obvious to the improvement of high-temperature behavior, the price of adding SBR is also expensive.
Wilkinite is a kind of important nonmetallic minerals, and world's total reserves is 1,300,000,000 tons, and mainly producing bentonitic country has the U.S., China, Russia, Italy, Greece, India and Germany etc.; And the wilkinite reserves of China are only second to the U.S. and occupy the second place of the world, and existing produced quantity is about 2,000,000 tons.Spread all over 22 nearly 80 counties of province according to investigating bentonite resource, more than 400 mining point arranged, as Liaoning, Jilin, Zhejiang, Shandong, Jiangsu, Xinjiang, Sichuan, Guangxi, Henan, Gansu; Because bentonite resource is abundant, low price.If use its composition modified asphalt, can improve the high temperature and the ageing resistance of modifying asphalt, especially obvious to the improvement of high-temperature behavior; And can reduce the cost of modifying asphalt.
Summary of the invention
In order to overcome the technical problem of existing modifying asphalt, the invention provides a kind of bentonite composition modified asphalt and preparation method thereof, the pitch after the modification has high temperature and low-temperature performance is improved largely for matrix pitch.
The technical solution adopted for the present invention to solve the technical problems is: a kind of bentonite composition modified asphalt is made up of following materials based on weight:
Matrix pitch 94～98,
Wilkinite 1～3,
Powder styrene butadiene rubber 1～3.
Above-mentioned wilkinite is a kind of in the wilkinite of calcium-base bentonite or sodium or the organobentonite at least.
A kind of preparation method of bentonite composition modified asphalt is: earlier wilkinite is carried out the original soil desanding, wilkinite after the desanding is carried out drying, then dried wilkinite is ground, with 325 purpose sieve, again the wilkinite that sieves is joined in the molten matrix pitch, in slowly stirring, add powder styrene butadiene rubber, its blend is evenly made through high speed shear.Its holding temperature is 170～190 ℃, and rotating speed is 4000～6000rpm/min, and the high speed shear time is 30～50min.
Or have the sodium salt Na of the wilkinite after the desanding
2CO
3Or NaHCO
3Carry out sodium and add the step of powder styrene butadiene rubber in bitumen emulsifying machine, its holding temperature is 170～190 ℃, and rotating speed is 4000～6000rpm/min, and the high speed shear time is 30～50min.
Advantage of the present invention and beneficial effect are:
1, uses the composition modified asphalt of wilkinite, powder SBR, by showing that with X-ray diffraction and TEM (transmission electron microscope) analysis the part material in the pitch inserts bentonitic interlayer, make bentonitic laminate structure partly peel off the back and form exfoliated nanoparticle, its minimum grain size 5nm; The property that nanoparticle had is reflected in the modifying asphalt as thermostability, high strength and ageing resistance, and the high temperature performance of matrix pitch is improved.
2, because wilkinite is a kind of Mineral resources and pollution-free, during with bentonite modified pitch irritant gas emit less, so less to modifying asphalt grown place environmental influence on every side.
3, after the present invention adds wilkinite in matrix pitch, add powder styrene butadiene rubber (SBR) again, the high speed shear blend is even, comprehensive raising the every pavement performance of bituminous; Pitch has characteristics such as high-temperature stability, low temperature anti-cracking performance and ageing resistance be good after the modification, has reduced the cost of modifying asphalt again.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is the influence of the used properties-correcting agent of the present invention (1 part of wilkinite, powder SBR3 part) to asphalt performance;
After Fig. 2 is the used properties-correcting agent of the present invention (1 part of wilkinite, powder SBR3 part) modifying asphalt, to the influence of rotating thin film oven ageing experiment back asphalt performance;
Embodiment
Embodiment 1: earlier calcium-base bentonite is carried out the original soil desanding, the wilkinite after the desanding carries out drying, and dry back is ground and sieved with 325 mesh sieve, 1 part of wilkinite that sieves is added in 94 parts of molten matrix pitches again, and constantly stirs and avoid local superheating.When stirring, adds 3 parts powder styrene butadiene rubber, the maintenance temperature is the high-shear under 170 ℃, 4000rpm/min shearing rate, stirs 50min in the bitumen emulsifying machine, and it is mixed, and promptly obtains modifying asphalt.5 degree ductilities (5cm/min, 5 ℃, cm) are that 164,25 degree penetration degrees (25 ℃, 100g, 5s, 0.1mm) are 63 after measured, softening temperature (℃) be 56; Rotating thin film baking oven experiment (RTFOT) back 5 degree ductilities (5cm/min, 5 ℃, cm) are 67, and penetration ratio (%) is 84.
Bituminous softening temperature and low-temperature ductility improve as shown in Figure 1, and the bituminous high temperature performance all improves
Modifying asphalt has not only kept good low-temperature ductility after the experiment of rotating thin film oven ageing as shown in Figure 2, and the penetration degree loss is little, illustrates that its ageing resistance is good.
Embodiment 2: earlier calcium-base bentonite is carried out the original soil desanding, wilkinite after the desanding carries out drying, dry back is ground and is sieved with 325 mesh sieve, the prepared wilkinite that will sieve carries out the organic active processing with quaternary ammonium salt, make its interlamellar spacing increase, help the easier insertion of part material in the pitch, then 3 parts of organobentonites that sieve are added in 96 parts of molten matrix pitches, and constantly stir and avoid local superheating.When stirring, adds 1 part powder styrene butadiene rubber, the maintenance temperature is the high-shear under 180 ℃, 4500rpm/min shearing rate, stirs 40min in the bitumen emulsifying machine, and it is mixed, and promptly obtains modifying asphalt.5 degree ductilities (5cm/min, 5 ℃, cm) are that 160,25 degree penetration degrees (25 ℃, 100g, 5s, 0.1mm) are 62 after measured, softening temperature (℃) be 56; Rotating thin film baking oven experiment (RTFOT) back 5 degree ductilities (5cm/min, 5 ℃, cm) are 69, and penetration ratio (%) is 85.
Embodiment 3: earlier calcium-base bentonite is carried out the original soil desanding, with the sodium salt (Na of the wilkinite after the desanding
2CO
3Or NaHCO
3Deng) carry out sodium, dry back is ground and is sieved with 325 mesh sieve, 1.5 parts of wilkinites that sieve is added in 98 parts of molten matrix pitches again, and constantly stirs and avoid local superheating.When stirring, adds 2.5 parts powder styrene butadiene rubber, the maintenance temperature is the high-shear under 190 ℃, 6000rpm/min shearing rate, stirs 30min in the bitumen emulsifying machine, and it is mixed, and promptly obtains modifying asphalt.5 degree ductilities (5cm/min, 5 ℃, cm) are that 65,25 degree penetration degrees (25 ℃, 100g, 5s, 0.1mm) are 67 after measured, softening temperature (℃) be 55; Rotating thin film baking oven experiment (RTFOT) back 5 degree ductilities (5cm/min, 5 ℃, cm) are 45, and penetration ratio (%) is 80.
Embodiment 4: with the above embodiments step, different is, and to adopt 2 parts of wilkinites, 3 parts of powder styrene butadiene rubbers, effect to be that properties-correcting agent disperses in pitch more even, and its maximum particle diameter is 0.8um, and the existence of part nanoparticle is arranged, and minimum grain size is 5nm.Pitch undulate laminate structure after the modification, but also have tacticity.
Claims (4)
1, a kind of bentonite composition modified asphalt is characterized in that: be made up of following materials based on weight:
Matrix pitch 94～98,
Wilkinite 1～3,
Powder styrene butadiene rubber 1～3.
2, the described a kind of bentonite composition modified asphalt of claim 1 is characterized in that: described wilkinite is a kind of in the wilkinite of calcium-base bentonite or sodium or the organobentonite at least; Styrene-butadiene rubber(SBR) is Powdered.
3, the preparation method of a kind of bentonite composition modified asphalt as claimed in claim 1, it is characterized in that: earlier wilkinite is carried out the original soil desanding, wilkinite after the desanding is carried out drying, then dried wilkinite is ground, with 325 purpose sieve, again 325 purpose wilkinites are joined in the molten matrix pitch, in stirring, add powder styrene butadiene rubber, holding temperature is 170～190 ℃, and under 4000～6000rpm/min rotating speed, high speed shear 30～50min evenly makes its blend.
4, the described a kind of bentonite composition modified asphalt preparation method of claim 3 is characterized in that: have the sodium salt Na of the wilkinite after the desanding
2CO
3Or NaHCO
3Carry out sodium or carry out the step of organic active processing and in bitumen emulsifying machine, add powder styrene butadiene rubber with quaternary ammonium salt, holding temperature is 170～190 ℃, and under 4000～6000rpm/min rotating speed, high speed shear 30～50min, the step that it is mixed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100691665A CN1259375C (en) | 2004-07-07 | 2004-07-07 | Bentonite composition modified asphalt and its preparing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100691665A CN1259375C (en) | 2004-07-07 | 2004-07-07 | Bentonite composition modified asphalt and its preparing method |
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| Publication Number | Publication Date |
|---|---|
| CN1587320A CN1587320A (en) | 2005-03-02 |
| CN1259375C true CN1259375C (en) | 2006-06-14 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100485003C (en) * | 2006-04-24 | 2009-05-06 | 深圳清华大学研究院 | Bituminous composite modified master and method for preparing modified asphalt |
| CN1935905B (en) * | 2006-09-30 | 2010-05-12 | 武汉理工大学 | Age-resistant modified asphalt and its preparing method |
| CN103897410B (en) * | 2013-12-16 | 2016-01-20 | 龚义海 | Motorway and bridge composite modified asphalt |
| CN105694490B (en) * | 2016-01-25 | 2018-06-26 | 北京化工大学 | A kind of preparation method of montmorillonite butadiene-styrene rubber composite modified emulsification asphalt |
| CN107572905B (en) * | 2017-07-19 | 2020-06-09 | 浙江省通用砂浆研究院 | Preparation and application of green environment-friendly high-elastic anti-crack pouring mortar for fabricated building |
| CN109135308A (en) * | 2018-08-09 | 2019-01-04 | 成都道盛路通新材料有限公司 | A kind of modified pitch, asphalt modifier and preparation method thereof |
| CN112011091B (en) * | 2020-08-10 | 2022-03-18 | 中交第二公路勘察设计研究院有限公司 | Compound modifier, compound modified ultraviolet aging resistant asphalt and preparation method thereof |
| CN115505276A (en) * | 2022-09-29 | 2022-12-23 | 厦门新立基股份有限公司 | Ultrathin overlay modified asphalt and preparation method thereof |
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