CN101838400A - Regenerant for regenerating waste asphalt and preparation method thereof - Google Patents
Regenerant for regenerating waste asphalt and preparation method thereof Download PDFInfo
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- CN101838400A CN101838400A CN201010145636A CN201010145636A CN101838400A CN 101838400 A CN101838400 A CN 101838400A CN 201010145636 A CN201010145636 A CN 201010145636A CN 201010145636 A CN201010145636 A CN 201010145636A CN 101838400 A CN101838400 A CN 101838400A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/141—Feedstock
- Y02P20/143—Feedstock the feedstock being recycled material, e.g. plastics
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
Abstract
The invention relates to a regenerant for regenerating waste asphalt and a preparation method thereof. The regenerant is characterized by comprising a component A and a component B, wherein the two components exist independently and are matched with each other during use; the component A is prepared from the following materials in part by weight: 80 to 100 parts of regenerative components, 10 to 50 parts of rubber powder, 0.1 to 5 parts of scorch retarder and 0.1 to 3 parts of aging inhibitor; the regenerative components are one or a mixture of more than two of petroleum residual oil, atmospheric distillate or vacuum gas oil, furfural extract oil, catalytic cracking clarified oil and base oil for lubricating oil in any proportion; and the component B is prepared from the following materials in part by weight: 80 to 100 parts of solvent oil, 0.1 to 10 parts of vulcanizing agent, 0.1 to 10 parts of accelerator and 1 to 10 parts of active agent. The regenerant has low cost; particularly due to the use of waste rubber powder, the resource waste is reduced, the environment is protected, and the tracking resistance, cracking resistance and the like of a regenerated asphalt road can be effectively improved; and furthermore, the preparation process is simple and the energy consumption is low.
Description
Technical field
The present invention relates to the road pavement material, particularly be that a kind of road that is used for reclaims regenerator of regenerating waste asphalt and preparation method thereof.
Background technology
Premium propertiess such as the road surface of asphalt paving is a kind of jointless continuous pavement, and it is strong with holding capacity, no airborne dust, the anti-cunning of wafing, noise are low have obtained widespread use in worldwide.But, bituminous pavement in use engenders diseases such as ageing of asphalt, pavement cracking, damage by water evil, rut owing to influence of various factors such as being subjected to carload, rainwater, ultraviolet ray, high temperature, low temperature, and causes the pavement performance of bituminous pavement to reduce greatly even can't use.At present, the annual bituminous pavement above 10% of China need be overhauled, waste asphalt mixture is above 2,000,000 tons, not only cause data waste and environmental pollution, also need the virgin material of same quantity to re-lay simultaneously, virgin material need be exploited a large amount of ore deposits and crude oil when producing, simultaneously when production of resources, also need a large amount of energy to process, therefore cause double resource, energy dissipation, and discharge a large amount of greenhouse gases, this makes the matter worse to the global climate that has warmed beyond doubt, therefore to aging, the bituminous pavement that disease is serious is regenerated and is all paid much attention to both at home and abroad, a kind of maintenance method of energy-conserving and environment-protective.
Along with the quick growth of China's automobile pollution, the output of China's tire and the quantity of junked tire increase year by year.Data shows that 2006, China's tire output was up to 2.8 hundred million, and junked tire quantity also reaches more than 1.4 hundred million, about 3,600,000 tons, occupies first place in the world.Junked tire belongs to deleterious solid waste, and its natural decomposition need reach the time in hundreds of years.Do not recycle if do not adopt an effective measure, not only can cause the wasting of resources, and can bring serious environmental to pollute.
If the processing of junked tire and the utilization again of waste asphalt can be combined, can reach undoubtedly with the useless purpose of giving up of supporting, can save a large amount of resources simultaneously, reduce the consumption of the energy.
Summary of the invention
The objective of the invention is to the processing of junked tire and the utilization again of waste asphalt are combined, provide a kind of rubber powder with junked tire be component one be used for regenerator of regenerating waste asphalt and preparation method thereof.
The present invention includes two components of A, B, two components are independent respectively to be existed, and is used during use; Two components of aforementioned A, B are formulated by weight by following material respectively:
A component: 80～100 parts of components of regeneration, 10～50 parts of rubber powders, scorch retarder 0.1-5 part, anti-aging agent: 0.1-3 part; Aforementioned regeneration component is one or more the mixture of arbitrary proportion in petroleum residual oil, normal/vacuum distillate, furfural extract oil, fluid catalytic cracking decant oil, the lubricant base.
B component: solvent oil 80-100 part, vulcanizing agent 0.1-10 part, promotor 0.1-10 part, activator: 1-10 part.
To be waste tire of automobile become fineness through crushing grinding to above-mentioned rubber powder is one or more the mixture of arbitrary proportion in 20 orders, 40 orders, 60 orders, 80 orders, 100 orders, 120 orders, 140 orders, 160 orders and the 200 purpose desulfurization rubber powders.
Above-mentioned scorch retarder is Tetra hydro Phthalic anhydride, phenylformic acid, Whitfield's ointment, N nitrosodiphenyl amine (NA), N-nitroso-group-2,2, one or more the mixture of arbitrary proportion wherein such as 4-trimethylammonium-1,2-dihyaroquinoline polymkeric substance, N-cyclohexylthiophthalimide (CTP), N-morpholine sulfo-phthalic imidine (MTP) etc.
Above-mentioned anti-aging agent is N-sec.-propyl-N '-phenyl-Ursol D (4010NA), N-(1, the 3-dimethylbutyl)-N-diphenyl-para-phenylene diamine (4020), 2,2,4-trimethylammonium-1, the mixture of one or more arbitrary proportions in 2-dihyaroquinoline (RD), the N-phenyl-1-naphthylamine (first).
Above-mentioned solvent oil is the mixture of one or both arbitrary proportions in 180#, the 220# high boiling point aromatic hydrocarbon solvent oil.
Above-mentioned vulcanizing agent is a sulphur, 4, the mixture of one or more arbitrary proportions in the polysulfide of 4 '-dithio morpholine (DTDM), fatty ether, alkyl phenol disulfide, zinc peroxide, dicumyl peroxide (DCP), benzoyl peroxide (BPO), the peroxidation (2,4 dichloro benzene formyl) (DCBP).
Above-mentioned promotor is that 2-dredges basic benzothiazole (M), dibenzothiazyl disulfide (DM), 1, two (benzothiazole-2-sulphomethyl) ureas of 3-, 2-sulfhydryl thiazole quinoline (2-MT), N-diethyl-2-benzothiazole-sulfenamide (AZ), N tert butyl benzothiazole 2 sulfenamide (NS), N cyclohexyl 2 benzothiazole sulfenamide (CBS/CZ), N oxydiethylene 2 benzothiazole sulfenamide (NOBS), N-dicyclohexyl-2-[4-morpholinodithio sulphenamide (DZ), tetramethylthiuram monosulfide (TMTS), the mixture of one or more arbitrary proportions in the tetramethyl-thiuram disulfide (TMTD).
Above-mentioned activator is the mixture of zinc oxide and stearic arbitrary proportion.
The preparation of regenerator of the present invention comprises the steps:
1) preparation of A component: the preheating reactor also starts whipping device, stir speed (S.S.) is 60 commentaries on classics/min, the component of will regenerating slowly drops in the reactor, after being heated to 80-130 ℃ gradually, put into rubber powder in the reactor gradually while stirring, stir speed (S.S.) changes the quick stirring of 200 commentaries on classics/min into and keeps 30-60min after reinforced the finishing, and stops heating then and be cooled to 60-100 ℃ gradually dropping into scorch retarder and anti-aging agent again, is stirred to and evenly promptly obtains the A component;
2) preparation of B component: the preheating reactor starts whipping device, stir speed (S.S.) is 60 commentaries on classics/min, slowly drop into solvent oil in the reactor, after being heated to 30-70 ℃ gradually, while stirring vulcanizing agent, promotor and activator are dropped in the reactor successively, stirring velocity becomes being stirred to fast of 200 commentaries on classics/min and evenly promptly obtains the B component after reinforced the finishing.
The present invention is being used by 1: 1 mass ratio of A component and B component in use.
Because the main raw material(s) that the present invention uses mostly is junk, so cost is low, particularly the utilization of waste rubber powder not only reduces the wasting of resources, protection environment, and can effectively improve performances such as the anti-rut of reclaimed bituminous pavement and cracking resistance; And preparation technology of the present invention is simple, and power consumption is few, meets the national industrial policies of green Sustainable development.
Embodiment
In following examples if no special instructions the stirring velocity of reactor be 60 commentaries on classics/min, fast stirring velocity is 200 commentaries on classics/min.
Embodiment 1
The preheating reactor also starts whipping device, to take by weighing the 400g petroleum residual oil in proportion slowly drops in the reactor, be heated to 100 ℃ gradually, the 40 order rubber powder 150g that will take by weighing in proportion while stirring put in the reactor, change quick stirring into and keep 30min, be cooled to 70 ℃ then gradually and drop into 5g Tetra hydro Phthalic anhydride, 5g phenylformic acid and the 7.5gN-sec.-propyl-N '-phenyl-Ursol D that takes by weighing in proportion again, be stirred to and evenly promptly obtain the A component; The preheating reactor, the solvent oil 250g180# solvent oil and the 250g220# high boiling point aromatic hydrocarbon solvent oil that take by weighing are in proportion dropped in the reactor, be heated to 50 ℃ and constantly stirring gradually, the 5g sulphur that will take by weighing in proportion again, 2.5g 2-dredge basic benzothiazole and 7.5g dibenzothiazyl disulfide, 5g zinc oxide and 25g stearic acid drop in the reactor successively, is stirred to fast and evenly promptly obtains the B component.
Embodiment 2
The preheating reactor also starts whipping device, slowly drop into the 100g vacuum residuum and the 350g furfural extract oil that take by weighing in proportion in the reactor, be heated to 120 ℃ and constantly stirring gradually, 20 order rubber powder 100g that will take by weighing in proportion while stirring and 80 order rubber powder 100g put in the reactor, change quick stirring into and keep 45min, be cooled to 80 ℃ then gradually and drop into the 2gN-nitrosodiphenylamine that takes by weighing in proportion again, 3gN-nitroso-group-2,2,4-trimethylammonium-1, the 2-dihyaroquinoline, (1.5gN-1, the 3-dimethylbutyl) N-diphenyl-para-phenylene diamine, 2.5g2,2,4-trimethylammonium-1, the 2-dihyaroquinoline is stirred to and evenly promptly obtains the A component; The preheating reactor, the 500g220# high boiling point aromatic hydrocarbon solvent oil that takes by weighing is in proportion dropped in the reactor, be heated to 50 ℃ and constantly stirring gradually, the 6g 4 that will take by weighing in proportion again, 4 '-dithio morpholine and 4g zinc peroxide vulcanizing agent, 5g1, two (benzothiazole-2-sulphomethyl) ureas of 3-and 7.5g2-sulfhydryl thiazole quinoline, 5g zinc oxide and 20g stearic acid drop in the reactor successively, are stirred to fast and evenly promptly obtain the B component.
Embodiment 3
The preheating reactor also starts whipping device, the 200g fluid catalytic cracking decant oil and the 300g lubricant base that take by weighing are in proportion dropped in the reactor, be heated to 130 ℃ and constantly stirring gradually, 120 order rubber powder 125g that will take by weighing in proportion while stirring and 200 order rubber powder 125g put in the reactor simultaneously, change quick stirring into and keep 55min, be cooled to 90 ℃ then gradually and drop into the 1.0gN-cyclohexylthiophthalimide that takes by weighing in proportion again, 1.5gN-morpholine sulfo-phthalic imidine, 7.5gN-phenyl-1-naphthylamine is stirred to and evenly promptly obtains the A part; The preheating reactor, the 475g220# high boiling point aromatic hydrocarbon solvent oil that takes by weighing is in proportion dropped in the reactor, be heated to 55 ℃ and constantly stirring gradually, 5g benzoyl peroxide that will take by weighing in proportion again and 7.5g peroxidation (2, the 4-dichloro-benzoyl) vulcanizing agent, 2.5g tetramethylthiuram monosulfide and 5g tetramethyl-thiuram disulfide, 10g zinc oxide and 25g stearic acid drop in the reactor successively, are stirred to fast evenly promptly to obtain the B part.
Comparative Examples 1
Compare with embodiment 1, Comparative Examples 1 has been removed rubber powder.
The preheating reactor also starts whipping device, to take by weighing the 400g petroleum residual oil in proportion slowly drops in the reactor, be heated to 70 ℃ gradually, drop into 5g Tetra hydro Phthalic anhydride, 5g phenylformic acid and the 7.5gN-sec.-propyl-N '-phenyl-Ursol D that takes by weighing in proportion while stirring, be stirred to and evenly promptly obtain the A part; The preheating reactor, the solvent oil 250g180# solvent oil and the 250g220# high boiling point aromatic hydrocarbon solvent oil that take by weighing are in proportion dropped in the reactor, be heated to 50 ℃ and constantly stirring gradually, the 5g sulphur that will take by weighing in proportion again, 2.5g 2-dredge basic benzothiazole and 7.5g dibenzothiazyl disulfide, 5g zinc oxide and 25g stearic acid drop in the reactor successively, is stirred to fast and evenly promptly obtains the B part.
The aged asphalts that table 1 extracts from waste asphalt mixture with three kinds of regenerators regeneration among embodiment 1, embodiment 2 and the embodiment 3, the volume of regenerator is to recover the level of penetration of bitumens to protobitumen (No. 70 petroleum pitch).
Table 1
*: volume is meant
Three kinds of regenerators in embodiment 1, embodiment 3 and the Comparative Examples 1 are regenerated to reclaiming asphalt, the regenerator volume is a benchmark with the pitch of old compound medium pitch material, the ratio of consumption and old material of newly gathering materials is 50: 50, bitumen aggregate ratio is as the criterion with the best bitumen aggregate ratio of regulating, and every performance of reclaimed asphalt mixture is as shown in table 2.
Table 2
*: the volume of regenerator is meant
Claims (10)
1. a regenerator that is used for regenerating waste asphalt is characterized in that comprising two components of A, B, and two components are independent respectively to be existed, and is used during use; Two components of aforementioned A, B are formulated by weight by following material respectively:
A component: 80～100 parts of components of regeneration, 10～50 parts of rubber powders, scorch retarder 0.1-5 part, anti-aging agent: 0.1-3 part; Aforementioned regeneration component is one or more the mixture of arbitrary proportion in petroleum residual oil, normal/vacuum distillate, furfural extract oil, fluid catalytic cracking decant oil, the lubricant base.
B component: solvent oil 80-100 part, vulcanizing agent 0.1-10 part, promotor 0.1-10 part, activator: 1-10 part.
2. regenerator according to claim 1 is characterized in that described rubber powder to be waste tire of automobile becomes fineness through crushing grinding to be one or more the mixture of arbitrary proportion in 20 orders, 40 orders, 60 orders, 80 orders, 100 orders, 120 orders, 140 orders, 160 orders and the 200 order desulfurization rubber powders.
3. regenerator according to claim 1, it is characterized in that described scorch retarder is Tetra hydro Phthalic anhydride, phenylformic acid, Whitfield's ointment, N nitrosodiphenyl amine (NA), N-nitroso-group-2,2, one or more the mixture of arbitrary proportion wherein such as 4-trimethylammonium-1,2-dihyaroquinoline polymkeric substance, N-cyclohexylthiophthalimide (CTP), N-morpholine sulfo-phthalic imidine (MTP) etc.
4. regenerator according to claim 1, it is characterized in that described anti-aging agent is N-sec.-propyl-N '-phenyl-Ursol D (4010NA), N-(1, the 3-dimethylbutyl)-N-diphenyl-para-phenylene diamine (4020), 2,2,4-trimethylammonium-1, the mixture of one or more arbitrary proportions in 2-dihyaroquinoline (RD), the N-phenyl-1-naphthylamine (first).
5. regenerator according to claim 1 is characterized in that described solvent oil is the mixture of one or both arbitrary proportions in 180#, the 220# high boiling point aromatic hydrocarbon solvent oil.
6. bitumen regenerant according to claim 1, it is characterized in that described vulcanizing agent is a sulphur, 4, the mixture of one or more arbitrary proportions in the polysulfide of 4 '-dithio morpholine (DTDM), fatty ether, alkyl phenol disulfide, zinc peroxide, dicumyl peroxide (DCP), benzoyl peroxide (BPO), the peroxidation (2,4 dichloro benzene formyl) (DCBP).
7. bitumen regenerant according to claim 1, it is characterized in that described promotor is that 2-dredges basic benzothiazole (M), dibenzothiazyl disulfide (DM), 1, two (benzothiazole-2-sulphomethyl) ureas of 3-, 2-sulfhydryl thiazole quinoline (2-MT), N-diethyl-2-benzothiazole-sulfenamide (AZ), N tert butyl benzothiazole 2 sulfenamide (NS), N cyclohexyl 2 benzothiazole sulfenamide (CBS/CZ), N oxydiethylene 2 benzothiazole sulfenamide (NOBS), N-dicyclohexyl-2-[4-morpholinodithio sulphenamide (DZ), tetramethylthiuram monosulfide (TMTS), the mixture of one or more arbitrary proportions in the tetramethyl-thiuram disulfide (TMTD).
8. bitumen regenerant according to claim 1 is characterized in that described activator is the mixture of zinc oxide and stearic arbitrary proportion.
9. the preparation method of any regenerator of claim 1 to 9 is characterized in that comprising the steps:
1) preparation of A component: the preheating reactor also starts whipping device, stir speed (S.S.) is 60 commentaries on classics/min, the component of will regenerating slowly drops in the reactor, after being heated to 80-130 ℃ gradually, put into rubber powder in the reactor gradually while stirring, stir speed (S.S.) changes the quick stirring of 200 commentaries on classics/min into and keeps 30-60min after reinforced the finishing, and stops heating then and be cooled to 60-100 ℃ gradually dropping into scorch retarder and anti-aging agent again, is stirred to and evenly promptly obtains the A component;
2) preparation of B component: the preheating reactor starts whipping device, stir speed (S.S.) is 60 commentaries on classics/min, slowly drop into solvent oil in the reactor, after being heated to 30-70 ℃ gradually, while stirring vulcanizing agent, promotor and activator are dropped in the reactor successively, stirring velocity becomes being stirred to fast of 200 commentaries on classics/min and evenly promptly obtains the B component after reinforced the finishing.
10. the using method of any regenerator of claim 1 to 9, A component and B component is used by 1: 1 mass ratio when it is characterized in that using.
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| CN201010145636A CN101838400A (en) | 2010-04-09 | 2010-04-09 | Regenerant for regenerating waste asphalt and preparation method thereof |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102140253A (en) * | 2011-01-10 | 2011-08-03 | 东南大学 | Special low-viscosity easy-dispersion regenerant for modified asphalt and preparation method thereof |
| CN103602082A (en) * | 2013-11-19 | 2014-02-26 | 青岛广联达精密机械有限公司 | Asphalt flame-retardant modifier |
| CN103740121A (en) * | 2014-01-24 | 2014-04-23 | 长安大学 | Road modified asphalt |
| CN104017380A (en) * | 2014-06-23 | 2014-09-03 | 东营润丰博越石油技术有限公司 | Liquid modified asphalt stabilizer |
| CN104558732A (en) * | 2014-12-30 | 2015-04-29 | 江苏文昌新材料科技有限公司 | High-temperature mixed type waste rubber modified asphalt enhancer composition and preparation method thereof |
| CN106118078A (en) * | 2016-06-23 | 2016-11-16 | 陕西正得信热再生公路养护股份有限公司 | A kind of Colophonium warm mix modifying agent and preparation method thereof |
| WO2019161605A1 (en) * | 2018-02-26 | 2019-08-29 | 徐州工业职业技术学院 | Waste rubber low-temperature high-efficiency composite regeneration activator ns/sa and preparation method therefor |
| CN110317670A (en) * | 2019-03-19 | 2019-10-11 | 重庆众瑞晟科技有限责任公司 | A kind of anti-coking agent and preparation method thereof applied in the distillation process that waste lubricant oil regeneration utilizes |
| CN112430010A (en) * | 2020-11-26 | 2021-03-02 | 东南大学 | Desulfurized reclaimed rubber reclaimed asphalt mixture and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101255245A (en) * | 2008-04-10 | 2008-09-03 | 华东理工大学 | Road bitumen regenerative agent |
| CN101629020A (en) * | 2009-08-10 | 2010-01-20 | 江苏省建筑科学研究院有限公司 | Special regenerant suitable for regenerating modified asphalt and prepared method thereof |
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2010
- 2010-04-09 CN CN201010145636A patent/CN101838400A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101255245A (en) * | 2008-04-10 | 2008-09-03 | 华东理工大学 | Road bitumen regenerative agent |
| CN101629020A (en) * | 2009-08-10 | 2010-01-20 | 江苏省建筑科学研究院有限公司 | Special regenerant suitable for regenerating modified asphalt and prepared method thereof |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102140253A (en) * | 2011-01-10 | 2011-08-03 | 东南大学 | Special low-viscosity easy-dispersion regenerant for modified asphalt and preparation method thereof |
| CN103602082A (en) * | 2013-11-19 | 2014-02-26 | 青岛广联达精密机械有限公司 | Asphalt flame-retardant modifier |
| CN103602082B (en) * | 2013-11-19 | 2016-01-06 | 青岛祥嘉知识产权服务有限公司 | A kind of bitumen flame-proof modifier |
| CN103740121A (en) * | 2014-01-24 | 2014-04-23 | 长安大学 | Road modified asphalt |
| CN103740121B (en) * | 2014-01-24 | 2015-10-21 | 长安大学 | A kind of road modified asphalt |
| CN104017380A (en) * | 2014-06-23 | 2014-09-03 | 东营润丰博越石油技术有限公司 | Liquid modified asphalt stabilizer |
| CN104558732A (en) * | 2014-12-30 | 2015-04-29 | 江苏文昌新材料科技有限公司 | High-temperature mixed type waste rubber modified asphalt enhancer composition and preparation method thereof |
| CN106118078A (en) * | 2016-06-23 | 2016-11-16 | 陕西正得信热再生公路养护股份有限公司 | A kind of Colophonium warm mix modifying agent and preparation method thereof |
| WO2019161605A1 (en) * | 2018-02-26 | 2019-08-29 | 徐州工业职业技术学院 | Waste rubber low-temperature high-efficiency composite regeneration activator ns/sa and preparation method therefor |
| CN110317670A (en) * | 2019-03-19 | 2019-10-11 | 重庆众瑞晟科技有限责任公司 | A kind of anti-coking agent and preparation method thereof applied in the distillation process that waste lubricant oil regeneration utilizes |
| CN112430010A (en) * | 2020-11-26 | 2021-03-02 | 东南大学 | Desulfurized reclaimed rubber reclaimed asphalt mixture and preparation method thereof |
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Open date: 20100922 |