CN103087673A - Modified asphalt cold adhesive and preparation process thereof - Google Patents
Modified asphalt cold adhesive and preparation process thereof Download PDFInfo
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- CN103087673A CN103087673A CN2013100634731A CN201310063473A CN103087673A CN 103087673 A CN103087673 A CN 103087673A CN 2013100634731 A CN2013100634731 A CN 2013100634731A CN 201310063473 A CN201310063473 A CN 201310063473A CN 103087673 A CN103087673 A CN 103087673A
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- weight part
- cold adhesive
- asphalt cold
- dissolvings
- pitch
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- 239000010426 asphalt Substances 0.000 title claims abstract description 36
- 239000000853 adhesive Substances 0.000 title claims abstract description 29
- 230000001070 adhesive effect Effects 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title claims abstract description 7
- 239000003921 oil Substances 0.000 claims abstract description 16
- 239000003995 emulsifying agent Substances 0.000 claims abstract description 15
- 239000000843 powder Substances 0.000 claims abstract description 12
- 239000003960 organic solvent Substances 0.000 claims abstract description 11
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 claims abstract description 9
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 claims abstract description 9
- 229920006271 aliphatic hydrocarbon resin Polymers 0.000 claims abstract description 9
- 229920005989 resin Polymers 0.000 claims abstract description 9
- 239000011347 resin Substances 0.000 claims abstract description 9
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000011295 pitch Substances 0.000 claims description 32
- 239000003795 chemical substances by application Substances 0.000 claims description 11
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 11
- 150000004945 aromatic hydrocarbons Chemical class 0.000 claims description 9
- 238000007599 discharging Methods 0.000 claims description 9
- 238000010792 warming Methods 0.000 claims description 9
- 238000005516 engineering process Methods 0.000 claims description 8
- 238000010276 construction Methods 0.000 abstract description 23
- 239000000463 material Substances 0.000 abstract description 15
- 238000000034 method Methods 0.000 abstract description 14
- 239000004698 Polyethylene Substances 0.000 abstract description 8
- 229920000573 polyethylene Polymers 0.000 abstract description 8
- -1 polyethylene Polymers 0.000 abstract description 7
- 239000002904 solvent Substances 0.000 abstract description 4
- 239000012298 atmosphere Substances 0.000 abstract description 2
- 239000003607 modifier Substances 0.000 abstract 2
- 239000002562 thickening agent Substances 0.000 abstract 2
- 239000010692 aromatic oil Substances 0.000 abstract 1
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 abstract 1
- SFLMUHDGSQZDOW-FAOXUISGSA-N coniferin Chemical compound COC1=CC(\C=C\CO)=CC=C1O[C@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 SFLMUHDGSQZDOW-FAOXUISGSA-N 0.000 abstract 1
- SFLMUHDGSQZDOW-IBEHDNSVSA-N coniferoside Natural products COC1=CC(C=CCO)=CC=C1O[C@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 SFLMUHDGSQZDOW-IBEHDNSVSA-N 0.000 abstract 1
- 125000002298 terpene group Chemical group 0.000 abstract 1
- 235000007586 terpenes Nutrition 0.000 abstract 1
- 239000012943 hotmelt Substances 0.000 description 6
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 4
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 229920001903 high density polyethylene Polymers 0.000 description 2
- 239000004700 high-density polyethylene Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 235000021168 barbecue Nutrition 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 229920001684 low density polyethylene Polymers 0.000 description 1
- 239000004702 low-density polyethylene Substances 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
The invention belongs to the technical field of cold adhering construction of waterproof coiled materials, and discloses a modified asphalt cold adhesive and a preparation process of the modified asphalt cold adhesive. The modified asphalt cold adhesive is mainly technically characterized by comprising No.100 asphalt, a thickening agent, an organic solvent, butadiene styrene rubber powder, a modifier, an emulsifier, etc.; the thickening agent is terpene resin, hydrogenated rosin, abietin or C5 resin; the organic solvent is naphthenic oil or aromatic oil; the modifier is SIS1105 or SBS796; and the emulsifier is OP-10. According to the modified asphalt cold adhesive, the high-quality solvent is adopted, nearly no harm and pollution are brought to the atmosphere and the environment, the problem that a polyethylene film is hardly adhered can be solved, and the construction is low; and when the modified asphalt cold adhesive is adopted and used for carrying out the construction to the waterproof coiled material through a cold adhering way, the process is simple in construction, and green and environment-friendly.
Description
Technical field
The invention belongs to waterproof roll cold bonding knot technical field of construction, relate in particular to a kind of modifying asphalt cold adhesive and preparation technology thereof.
Background technology
Modified asphalt waterproof coiled material is by the closely bonding of coiled material and basal plane, whole building structure is peripheral form one outside packaging waterproof layer and reach the effect of waterproof.Present modification asphalt felt and basal plane are bonding mainly to be reached by hot melt process.After hot melt process is namely melted one deck hot-melt polyethylene (PE) film on modified asphalt waterproof coiled material surface and modifying asphalt sizing material together with alcohol blast burner or spray gun, be bonded in while hot in the buildings basic unit that scribbles the base treatment agent that contains the benzene equal solvent.Although Hot-melt construction technique is simple, with low cost, there is fatal weakness:
1, because of hot melt barbecue, damage to a certain extent the surface of coiled material, broken ring web construction affects coiled material self life-span and reduces waterproof effect;
2, there is hidden danger in naked light construction, easily causes fire;
3, produce toxic and harmful in construction process, not only damage operating worker healthy, also pollute the environment.
Therefore, how to reduce to the full extent environmental pollution and energy consumption that the modified asphalt waterproof coiled material construction brings, become the task of top priority.Address this problem, unique channel is changed the modified asphalt waterproof coiled material construction technology exactly, seek pollution-free and pollute little construction technology, construction with cold alhesion method technique is just arisen at the historic moment, construction with cold alhesion method is direction and the trend of following coiled material construction, but also there is no the cold binding agent of suitable waterproof roll at present.
Summary of the invention
The modifying asphalt cold adhesive that uses when first technical problem that the present invention will solve just is to provide a kind of waterproof roll cold bonding knot construction.
For solving above-mentioned first technical problem, the technical solution used in the present invention is that a kind of modifying asphalt cold adhesive comprises the component of following weight part:
No. 100 pitches 36---45 weight parts
Tackifier 15---20 weight parts
Organic solvent 10---15 weight parts
Styrene butadiene rubber powder 10---20 weight parts
Properties-correcting agent 8---10 weight parts
Emulsifying agent 3---10 weight parts.
Its additional technical feature is: described tackifier are terpine resin, staybelite, rosin fat or C5 resin, and organic solvent is naphthenic oil or aromatic hydrocarbon oil, and properties-correcting agent is SIS1105 or SBS796, and emulsifying agent is OP-10.
Second technical problem that the present invention will solve just is to provide a kind of preparation technology of modifying asphalt cold adhesive.
For solving above-mentioned second technical problem, the technical solution used in the present invention comprises the steps:
The first step is 36, and------15 weight part organic solvent naphthenic oils or aromatic hydrocarbon oil are heated to 135 ℃---145 ℃ of dissolvings 0.8---1.2 hours to add 10 in 45 No. 100, weight part pitches;
Second step adds 8 again in pitch------10 weight part emulsifier op-10s are warming up to 180 ℃---190 ℃ of dissolvings 1.5---2 hours for the properties-correcting agent SIS1105 of 10 weight parts or SBS796,3;
The 3rd step then added 10 in pitch---20 weight part styrene butadiene rubber powders keep 180 ℃ of temperature---190 ℃ of dissolvings 1.5---2 hours;
The 4th step was cooled to 135 ℃ with pitch---145 ℃ add 15---tackifier of 20 weight part terpine resins, staybelite, rosin fat or C5 resin, discharging after dissolving fully.
A kind of modifying asphalt cold adhesive provided by the invention is a kind of green, free of contamination tackiness agent.It is the macromolecular compound that utilizes with the polyethylene film structure similar on modified asphalt waterproof coiled material surface, and its main component is the multipolymer of ethene and propylene.According to the principle of " similar person is compatible ", because of structural similitude, therefore its intermolecular London force approaches, in order to closely bond with polyethylene film, need to control the ratio of ethene and propylene in the multipolymer of ethene and propylene, control simultaneously the size of the polymerization degree.Like this in cold adhesive the multipolymer of ethene and propylene can well dissolve with solvent, swelling, build up the most at last with basal plane and bond together closely, play waterproof effect.
A kind of modifying asphalt cold adhesive provided by the invention has the following advantages: one, adopt high-quality solvent, in market and construction process to atmosphere and environment substantially without harm with pollute.They are two years old, solved the bonding hard problem of polyethylene face, added in order to reduce costs the high density polyethylene(HDPE) of economizing again because produce the producer of polyethylene film in the Low Density Polyethylene of easily melting, in the practice of construction process, the flame temperature of alcohol blast burner should not baking, do not have the polyethylene film of fusing to form sealing coat between coiled material and basal plane, make coiled material form empty paving, affect waterproof effect.Its three, reduced construction cost.From construction cost, modified asphalt waterproof coiled material is constructed every square and is needed use 0.15kg cold adhesive, 1.1 yuan of costs; Save 0.4 yuan than every square of hot melt construction.Carry out the waterproof roll construction with cold alhesion method with a kind of modifying asphalt cold adhesive provided by the invention, technique is not only constructed simply, and green, environmental protection.
Embodiment
Below by specific embodiment, a kind of modifying asphalt cold adhesive of the present invention and preparation technology thereof are described in further detail.
Embodiment 1
Step when a kind of modifying asphalt cold adhesive prepares is as follows:
The first step adds 15 weight part naphthenic oils to heat to 140 ℃ of dissolvings 1 hour in No. 100 pitches of 45 weight part;
Second step adds in the pitch 10 weight part SIS1105 or SBS796,10 weight part emulsifier op-10s to be warming up to 180 ℃ of dissolvings 1.5 hours again;
The 3rd step then added 10 weight part styrene butadiene rubber powders to keep 180 ℃ of dissolvings of temperature 1.5 hours in pitch;
The 4th step was cooled to 140 ℃ with pitch and adds 15 weight part terpine resins, discharging after dissolving fully.
Embodiment 2
Step when a kind of modifying asphalt cold adhesive prepares is as follows:
The first step adds 15 weight part naphthenic oils to heat to 140 ℃ of dissolvings 1 hour in No. 100 pitches of 45 weight part;
Second step adds in the pitch 10 weight part SIS1105 or SBS796,10 weight part emulsifier op-10s to be warming up to 180 ℃ of dissolvings 1.5 hours again;
The 3rd step then added 10 weight part styrene butadiene rubber powders to keep 180 ℃ of dissolvings of temperature 1.5 hours in pitch;
The 4th step was cooled to 140 ℃ with pitch and adds 15 weight part staybelites, discharging after dissolving fully.
Embodiment 3
Step when a kind of modifying asphalt cold adhesive prepares is as follows:
The first step adds 15 weight part aromatic hydrocarbon oil to heat to 140 ℃ of dissolvings 1 hour in No. 100 pitches of 45 weight part;
Second step adds in the pitch 10 weight part SIS1105 or SBS796,10 weight part emulsifier op-10s to be warming up to 180 ℃ of dissolvings 1.5 hours again;
The 3rd step then added 10 weight part styrene butadiene rubber powders to keep 180 ℃ of dissolvings of temperature 1.5 hours in pitch;
The 4th step was cooled to 140 ℃ with pitch and adds 15 weight part C5 resins, discharging after dissolving fully.
Embodiment 4
Step when a kind of modifying asphalt cold adhesive prepares is as follows:
The first step adds 15 weight part aromatic hydrocarbon oil to heat to 140 ℃ of dissolvings 1 hour in No. 100 pitches of 45 weight part;
Second step adds in the pitch the linear SIS1105 of 10 weight parts or SBS796,10 weight part emulsifier op-10s to be warming up to 180 ℃ of dissolvings 1.5 hours again;
The 3rd step then added 10 weight part styrene butadiene rubber powders to keep 180 ℃ of dissolvings of temperature 1.5 hours in pitch;
The 4th step was cooled to 140 ℃ with pitch and adds 15 weight part rosin fat, discharging after dissolving fully.
Embodiment 5
Step when a kind of modifying asphalt cold adhesive prepares is as follows:
The first step adds 10 weight part naphthenic oils or aromatic hydrocarbons wet goods organic solvent to heat to 135 ℃ of dissolvings 0.8 hour in No. 100 pitches of 36 weight part;
Second step adds properties-correcting agent, the 3 weight part emulsifier op-10s such as 8 weight part SIS1105 or SBS796 to be warming up to 180 ℃ of dissolvings 1.5 hours in pitch again;
The 3rd step then added 1 weight part styrene butadiene rubber powder to keep 180 ℃ of dissolvings of temperature 1.5 hours in pitch;
The 4th step was cooled to 135 ℃ with pitch and adds the tackifier such as 15 weight part terpine resins, staybelite, rosin fat or C5 resin, discharging after dissolving fully.
Embodiment 6
Step when a kind of modifying asphalt cold adhesive prepares is as follows:
The first step adds 12.5 weight part naphthenic oils or aromatic hydrocarbons wet goods organic solvent to heat to 140 ℃ of dissolvings 1 hour in No. 100 pitches of 40.5 weight part;
Second step adds properties-correcting agent, the 6.5 weight part emulsifier op-10s such as 9 weight part SIS1105 or SBS796 to be warming up to 185 ℃ of dissolvings 1.75 hours in pitch again;
The 3rd step then added 15 weight part styrene butadiene rubber powders to keep 185 ℃ of dissolvings of temperature 1.75 hours in pitch;
The 4th step was cooled to 140 ℃ with pitch and adds the tackifier such as 17.5 weight part terpine resins, staybelite, rosin fat or C5 resin, discharging after dissolving fully.
Embodiment 7
Step when a kind of modifying asphalt cold adhesive prepares is as follows:
The first step adds 15 weight part naphthenic oils or aromatic hydrocarbons wet goods organic solvent to heat to 145 ℃ of dissolvings 1.2 hours in No. 100 pitches of 45 weight part;
Second step adds properties-correcting agent, the 10 weight part emulsifier op-10s such as 10 weight part SIS1105 or SBS796 to be warming up to 190 ℃ of dissolvings 2 hours in pitch again;
The 3rd step then added 20 weight part styrene butadiene rubber powders to keep 190 ℃ of dissolvings of temperature 2 hours in pitch;
The 4th step was cooled to 145 ℃ with pitch and adds the tackifier such as 20 weight part terpine resins, staybelite, rosin fat or C5 resin, discharging after dissolving fully.
The concrete detected value of a kind of modifying asphalt cold adhesive provided by the invention such as following table:
Performance Detection
Carry out the waterproof roll construction with cold alhesion method with a kind of modifying asphalt cold adhesive provided by the invention, technique is not only constructed simply, and green, environmental protection.
Claims (3)
1. modifying asphalt cold adhesive is characterized in that comprising the component of following weight part:
No. 100 pitches 36---45 weight parts
Tackifier 15---20 weight parts
Organic solvent 10---15 weight parts
Styrene butadiene rubber powder 10---20 weight parts
Properties-correcting agent 8---10 weight parts
Emulsifying agent 3---10 weight parts.
2. a kind of modifying asphalt cold adhesive according to claim 1, it is characterized in that: described tackifier are terpine resin, staybelite, rosin fat or C5 resin, organic solvent is naphthenic oil or aromatic hydrocarbon oil, and properties-correcting agent is SIS1105 or SBS796, and emulsifying agent is OP-10.
3. the preparation technology of the described a kind of modifying asphalt cold adhesive of claim 1 or 2, is characterized in that comprising the steps:
The first step is 36, and------15 weight part organic solvent naphthenic oils or aromatic hydrocarbon oil are heated to 135 ℃---145 ℃ of dissolvings 0.8---1.2 hours to add 10 in 45 No. 100, weight part pitches;
Second step adds 8 again in pitch------10 weight part emulsifier op-10s are warming up to 180 ℃---190 ℃ of dissolvings 1.5---2 hours for the properties-correcting agent SIS1105 of 10 weight parts or SBS796,3;
The 3rd step then added 10 in pitch---20 weight part styrene butadiene rubber powders keep 180 ℃ of temperature---190 ℃ of dissolvings 1.5---2 hours;
The 4th step was cooled to 135 ℃ with pitch---145 ℃ add 15---tackifier of 20 weight part terpine resins, staybelite, rosin fat or C5 resin, discharging after dissolving fully.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310063473.1A CN103087673B (en) | 2013-02-28 | 2013-02-28 | Modified asphalt cold adhesive and preparation process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310063473.1A CN103087673B (en) | 2013-02-28 | 2013-02-28 | Modified asphalt cold adhesive and preparation process thereof |
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| Publication Number | Publication Date |
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| CN103087673A true CN103087673A (en) | 2013-05-08 |
| CN103087673B CN103087673B (en) | 2015-03-25 |
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| CN201310063473.1A Active CN103087673B (en) | 2013-02-28 | 2013-02-28 | Modified asphalt cold adhesive and preparation process thereof |
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| Country | Link |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103525106A (en) * | 2013-10-14 | 2014-01-22 | 浙江鲁班建筑防水有限公司 | Water-emulsion type modified asphalt with creep characteristic and preparation method thereof |
| CN110080473A (en) * | 2019-05-05 | 2019-08-02 | 宏源防水科技集团有限公司 | A kind of flat roof waterproof heat-insulation system and its construction method |
| CN110374271A (en) * | 2019-06-03 | 2019-10-25 | 宏源防水科技集团有限公司 | A kind of copper tire base root-resistant puncturing asphalt felt and preparation method thereof and process units |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1313373A (en) * | 2001-03-21 | 2001-09-19 | 北京市大运防水材料厂 | Asphalt-base cold adhesive for coiled water-proofing material |
| CN1478844A (en) * | 2003-07-10 | 2004-03-03 | 武汉路祥工贸有限公司 | Bridge surface water resistant binding admixture and its preparation method |
| CN101074351A (en) * | 2006-05-19 | 2007-11-21 | 中国石油化工股份有限公司 | Hot-melt asphalt adhesive and its production |
| CN101982517A (en) * | 2010-11-18 | 2011-03-02 | 天津市耀新科技发展有限公司 | Modified asphalt adhesive and preparation method thereof |
| CN102031002A (en) * | 2010-12-22 | 2011-04-27 | 北京东方雨虹防水技术股份有限公司 | Non-cured asphalt mastic |
-
2013
- 2013-02-28 CN CN201310063473.1A patent/CN103087673B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1313373A (en) * | 2001-03-21 | 2001-09-19 | 北京市大运防水材料厂 | Asphalt-base cold adhesive for coiled water-proofing material |
| CN1478844A (en) * | 2003-07-10 | 2004-03-03 | 武汉路祥工贸有限公司 | Bridge surface water resistant binding admixture and its preparation method |
| CN101074351A (en) * | 2006-05-19 | 2007-11-21 | 中国石油化工股份有限公司 | Hot-melt asphalt adhesive and its production |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103525106A (en) * | 2013-10-14 | 2014-01-22 | 浙江鲁班建筑防水有限公司 | Water-emulsion type modified asphalt with creep characteristic and preparation method thereof |
| CN110080473A (en) * | 2019-05-05 | 2019-08-02 | 宏源防水科技集团有限公司 | A kind of flat roof waterproof heat-insulation system and its construction method |
| CN110374271A (en) * | 2019-06-03 | 2019-10-25 | 宏源防水科技集团有限公司 | A kind of copper tire base root-resistant puncturing asphalt felt and preparation method thereof and process units |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103087673B (en) | 2015-03-25 |
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Effective date of registration: 20190312 Address after: 053000 No. 1 Rubber Road, Taocheng North Industrial Base, Hengshui City, Hebei Province Patentee after: Hengshui Zhongtie Built Material Manufacturing Co., Ltd. Address before: 053400 North Side of Huanlong Road, Circular Economy Park, Wuyi County, Hengshui City, Hebei Province Patentee before: HEBEI AOTELAI WATERPROOF MATERIAL CO., LTD. |
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Address after: 053000 Hengshui city of Hebei Province North Taocheng District industrial base rubber road No. 1 Patentee after: Hengshui Zhongyu Tiexin Waterproof Technology Co.,Ltd. Address before: 053000 Hengshui city of Hebei Province North Taocheng District industrial base rubber road No. 1 Patentee before: HENGSHUI ZHONGTIEJIAN EARTHWORK MATERIAL MANUFACTURING Co.,Ltd. |
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