CN102464891B - Road flame-retardant asphalt and preparation method - Google Patents
Road flame-retardant asphalt and preparation method Download PDFInfo
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- CN102464891B CN102464891B CN 201010535841 CN201010535841A CN102464891B CN 102464891 B CN102464891 B CN 102464891B CN 201010535841 CN201010535841 CN 201010535841 CN 201010535841 A CN201010535841 A CN 201010535841A CN 102464891 B CN102464891 B CN 102464891B
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Abstract
The invention relates to road flame-retardant asphalt and a preparation method. The road flame-retardant asphalt comprises, by weight, 70 to 80 parts of base asphalt, 3 to 9 parts of ammonium polyphosphate, 3 to 8 parts of zinc borate, 4 to 8 parts of magnesium hydroxide, 4 to 8 parts of pseudo-boehmite and 0 to 1.5 parts of a modifier. The preparation method for the flame-retardant asphalt comprises the following steps: fusing base asphalt, adding ammonium polyphosphate, zinc borate, magnesium hydroxide and pseudo-boehmite in proportion, adding the modifier after uniform stirring and uniformly dispersing the modifier. According to the invention, ammonium polyphosphate, zinc borate, magnesium hydroxide and pseudo-boehmite in the flame-retardant asphalt cooperate with each other, and in the process of a flame retarding reaction, pseudo-boehmite undergoes crystal phase transformation, which promotes dehydration/flame retardation response of ammonium polyphosphate. The road flame-retardant asphalt provided in the invention has a good flame retardant effect and a good smoke suppressing effect, has a high oxygen index, does not produce toxic gas like halogen hydride when burned and poses small harm to respiratory tracts and other organs of human bodies.
Description
Technical field
The invention belongs to the flame-retardant pitch technical field, be specifically related to a kind of environment friendly non-halogen road fire-resistant asphalt and preparation method thereof.
Background technology
Along with the development of China Higher level highway, the quantity of vcehicular tunnel constantly increases.Commonly used rigidity cement concrete pavement in the tunnel also is flattened, flexible bituminous concrete pavement wear-resisting, low noise replaces gradually.In the use of tunnel sheet pavement, the fire safety problem of bituminous concrete pavement also more and more causes people's attention.Because pitch is inflammable material, it is poor to add in the tunnel ventilation condition, causes that bituminous pavement catches fire if traffic accident takes place, because of intensity of a fire development swift and violent, personnel have little time to evacuate and cause bigger loss of life and personal injury, will inevitably cause unnecessary loss to the country and people's lives and properties.In addition, produce a large amount of black smokes when pitch catches fire, in the tunnel, be difficult for diffusion, can hinder escape personnel's sight line and the people is suffocated, both personnel were worked the mischief, again environment is caused severe contamination.So, at first must solve pitch and meet the fire burns problem, the amount of being fuming and toxic gas content when its less important reduction pitch burns.Therefore, use the flame-retardant pitch with flame retardant properties, smoke suppressing should be from now on tunnel road surface with the developing direction of pitch.
Present widely used halogen containing flame-retardant generates when burning cigarette, poisonous gas in a large number, can produce doubtful dioxins materials as decabromodiphynly oxide in combustion processes, can produce bigger harm to human body and environment.In recent years, countries such as the U.S., Britain have formulated or have enacted a law, and some fire retardant material is carried out combustion toxicity test or regulation combustion acid gas burst size.Along with environmental protection requirement is more and more higher, halogen-free flameproof demonstrates more and more important position, therefore develops halogen-free flame retardants and replaces the trend that halogen containing flame-retardant has become world's flame retardant area.
Use decabromodiphenyl ethane, zinc borate and antimonous oxide as fire retardant among the CN200610062960.6, belong to halogen flame, do not meet environmental protection requirement, the toxic gas of emitting also jeopardizes personnel safety.Halogenless fire retarded polymer modified asphalt among the CN200610019381.3, be to play fire-retardant effect by adding phosphorus system and nitrogen flame retardant, need to use phosphorus system and nitrogen flame retardant to cooperate, just can obtain required flame retardant effect, when only using phosphorus flame retardant, the flame retardant effect of flame-retardant pitch has much room for improvement.It is the asphalt flame-retardant agent that US4659381 discloses components such as employing ammonium polyphosphate, halogen containing flame-retardant, filling aluminium hydrate, ammonium polyphosphate and halogen containing flame-retardant need be used just and can obtain required effect, and the aluminium hydroxide large usage quantity causes certain influence to the use properties of flame-retardant pitch.CN200610082139.0 has introduced a kind of halogen-free roadfire-resistant asphalt, wherein fire retardant is melamine pyrophosphate salt, zinc borate and magnesium hydroxide, and for playing better smoke suppressing effect, this invention adds aluminium hydroxide when the mix mineral aggregate, increase algorithm, be unfavorable for the carrying out of constructing.And because therefore the decomposition temperature lower (140-150 ℃) of aluminium hydroxide has also limited its application.
Fire retardant not of the same race in use can produce different fiting effects, in the general and pitch combustion processes of comprehensive flame retardant effect, the chemical reaction course that takes place between the chemical reaction course that fire retardant takes place and the fire retardant is relevant, therefore, the different fit forms of fire retardant tend to produce different coordinated effects.
Summary of the invention
At the deficiencies in the prior art, the invention provides a kind of environment friendly halogen-free fireproof pitch and preparation method thereof, prepare a kind of vcehicular tunnel road flame-retardant pitch that requires that meets.
Road fire-resistant asphalt of the present invention, composition comprises by weight:
Basic asphalt 70-80 part;
Ammonium polyphosphate 3-9 part;
Zinc borate 3-8 part;
Magnesium hydroxide 4-8 part;
Pseudo-boehmite 4-8 part;
Properties-correcting agent 0-1.5 part.
In the road fire-resistant asphalt of the present invention, basic asphalt can specifically determine according to the requirement of using, as No. 70 pitch, No. 90 pitch, polymer modified asphalt etc.
In the road fire-resistant asphalt of the present invention, properties-correcting agent is waste tyre rubber powder, penetration degree properties-correcting agent, viscosity modifier etc.
In the road fire-resistant asphalt of the present invention, pseudo-boehmite (molecular formula Al
2O
3NH
2O, n are 1.4～2.0) be the crystalline aluminium hydroxide of a kind of half hitch, be field aluminum oxide precursor commonly used such as Preparation of Catalyst, can use the commercially available prod among the present invention, also can be by existing method preparation.
The preparation method of road fire-resistant asphalt of the present invention comprises the steps:
1. with the basic asphalt fusion, remain on 70～120 ℃;
2. in molten asphalt, add ammonium polyphosphate, zinc borate, magnesium hydroxide, pseudo-boehmite in proportion, stir 5min with agitator, each component is mixed;
3. adding properties-correcting agent is warming up to 140～180 ℃, stirs 10～60min, and properties-correcting agent is fully mixed with basic asphalt, can continue under the situation of needs with high-speed shearing equipment at 3000-4000r/min down cut 10～60min again.High-speed shearing machine is mainly colloidal mill, high-speed shearing machine etc.
In the road fire-resistant asphalt of the present invention, ammonium polyphosphate, zinc borate, magnesium hydroxide, pseudo-boehmite are worked in coordination, particularly ammonium polyphosphate and pseudo-boehmite cooperatively interact, in the flame retarding reaction process, pseudo-boehmite generation crystalline form transforms, and the dehydration flame retarding reaction of ammonium polyphosphate is had promote and coordinative role that pseudo-boehmite and zinc borate also can play synergy simultaneously, therefore, road fire-resistant asphalt of the present invention has good fire-retardant and smoke suppressing effect simultaneously.Flame-retardant pitch oxygen index of the present invention is higher, does not produce toxic gases such as hydrogen halide during burning, and is little to human respiratory tract and the injury of other organs.Preparation technology is simple, produces pollution-freely, and production cost is lower.
Embodiment
Among the present invention, ammonium polyphosphate belongs to expansion type flame retardant.It is nitrogenous, phosphorus amount height, and Heat stability is good is better dispersed, has characteristics such as Halogen, low cigarette, low toxicity simultaneously.Fire retardant mechanism is that thermal dehydration generates the strong dewatering agent of polyphosphoric acid, impels the organism surface dewatering to generate carbide, and the carbide of generation and polyphosphoric acid thereof cover substrate surface, thereby secluding air reaches fire-retardant purpose; The non-flammable gases of producing when burning in addition such as ammonia have watered down the concentration of inflammable gas in gas phase, make it to drop to below the inflammability limit, play the gas phase flame retardant effect.Pseudo-boehmite is not only smoke suppressant, and the dehydration flame retarding reaction to ammonium polyphosphate has promoter action in fire-retardant process, compares with independent use ammonium polyphosphate, and flame retardant effect obviously improves.Zinc borate is anti-flaming smoke-inhibiting agent, and properties-correcting agent is selected waste tyre rubber powder for use, improves flame-retardant pitch temperature-sensitive performance.
Embodiment 1:
Take by weighing by weight: petroleum pitch AH-70 (No. 70 pitches of Esso), 70 parts; 9 parts of ammonium polyphosphates; 8 parts of magnesium hydroxides; 8 parts of pseudo-boehmites, 3 parts of zinc borates, 1.5 parts of properties-correcting agent (properties-correcting agent is waste tyre rubber powder).
At first the petroleum pitch fusion is retained to 80 ℃, in molten asphalt, adds ammonium polyphosphate, zinc borate, magnesium hydroxide in proportion, stir 5min with agitator, each component is mixed.Add properties-correcting agent then, be warming up to 150 ℃, stir 30min, make rubber powder absorb oil content in the pitch and melt and expand, continue again with high-speed shearing machine to make properties-correcting agent fully molten bloated at 3000-4000r/min down cut 30min.In shear history, temperature is controlled in 170 ℃, obtains environment friendly halogen-free fireproof pitch at last.
Embodiment 2:
Take by weighing by weight: petroleum pitch AH-70,75 parts; 6 parts of ammonium polyphosphates; 6 parts of magnesium hydroxides; 6 parts of pseudo-boehmites, 6 parts of zinc borates, 1 part of properties-correcting agent.The flame-retardant pitch preparation process is with embodiment 1.
Embodiment 3:
Take by weighing by weight: petroleum pitch AH-70,80 parts; Ammonium polyphosphate 3; 4 parts of magnesium hydroxides; 4 parts of pseudo-boehmites, 8 parts of zinc borates, 0.5 part of properties-correcting agent.The flame-retardant pitch preparation process is with embodiment 1.
Comparative example 1:
According to method and the proportioning of embodiment 1, do not use pseudo-boehmite, magnesium hydroxide uses 16 parts.
Comparative example 2:
According to method and the proportioning of embodiment 1, pseudo-boehmite replaces with the ordinary hydrogen aluminum oxide of preparation pottery.
The data of embodiment and comparative example see the following form:
Can find out from last table, compare with comparative example, flame-retardant pitch oxygen index and the smoke density of the present invention's preparation all are improved, the oxygen index of flame-retardant pitch, smoke density and toxic grade have all reached the requirement of fire retardant material, and penetration of bitumens, ductility and softening temperature all meet the regulation of heavy traffic paving asphalt GB/T15180-2000.
Claims (4)
1. road fire-resistant asphalt is characterized in that forming by weight comprising:
Basic asphalt 70-80 part;
Ammonium polyphosphate 3-9 part;
Zinc borate 3-8 part;
Magnesium hydroxide 4-8 part;
Pseudo-boehmite 4-8 part;
Properties-correcting agent 0-1.5 part;
Wherein, described properties-correcting agent is waste tyre rubber powder, penetration degree properties-correcting agent or viscosity modifier.
2. according to the described road fire-resistant asphalt of claim 1, it is characterized in that: basic asphalt is No. 70 pitch, No. 90 pitch or polymer modified asphalt.
3. the preparation method of the described road fire-resistant asphalt of claim 1 comprises the steps:
(1) with the basic asphalt fusion, remains on 70～120 ℃;
(2) in molten asphalt, add ammonium polyphosphate, zinc borate, magnesium hydroxide, pseudo-boehmite in proportion, stir 5min with agitator, each component is mixed;
(3) add properties-correcting agent, be warming up to 140～180 ℃, stir 10～60min, properties-correcting agent is fully mixed with basic asphalt.
4. it is characterized in that in accordance with the method for claim 3: use high-speed shearing equipment at 3000-4000r/min down cut 10～60min after adding properties-correcting agent.
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| CN 201010535841 CN102464891B (en) | 2010-11-04 | 2010-11-04 | Road flame-retardant asphalt and preparation method |
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| CN 201010535841 CN102464891B (en) | 2010-11-04 | 2010-11-04 | Road flame-retardant asphalt and preparation method |
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| CN102464891A CN102464891A (en) | 2012-05-23 |
| CN102464891B true CN102464891B (en) | 2013-10-09 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105254206B (en) * | 2015-10-08 | 2017-12-05 | 苏州拓博琳新材料科技有限公司 | A kind of asphalt flame-retardant agent, its preparation method and application |
| CN106675047A (en) * | 2016-06-12 | 2017-05-17 | 广东天骄建材有限公司 | Flame-retardation asphalt-based waterproof coiled material |
| CN107163596A (en) * | 2017-06-26 | 2017-09-15 | 长安大学 | A kind of non-halogen flame-proof smoke-restraining pitch and preparation method thereof |
| CN107286554A (en) * | 2017-06-28 | 2017-10-24 | 常州万博金属构件厂 | A kind of flame-retardant pitch and preparation method thereof |
| CN108148422B (en) * | 2017-12-18 | 2020-07-17 | 吉林省豫王建能实业股份有限公司 | Flame-retardant three-dimensional colorful decorative waterproof coiled material and preparation method thereof |
| CN112552696A (en) * | 2020-11-28 | 2021-03-26 | 重庆交通大学 | Low-smoke flame-retardant modified asphalt suitable for paving extra-long tunnel and preparation method thereof |
| CN114455887B (en) * | 2022-03-25 | 2023-01-17 | 中咨数据有限公司 | High-strength asphalt concrete and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1569963A (en) * | 2003-07-25 | 2005-01-26 | 深圳市海川实业股份有限公司 | Fire-retardant and modified asphalt mixture |
| CN1935903A (en) * | 2005-09-22 | 2007-03-28 | 深圳市海川实业股份有限公司 | Halogen-free roadfire-resistant asphalt |
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2010
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1569963A (en) * | 2003-07-25 | 2005-01-26 | 深圳市海川实业股份有限公司 | Fire-retardant and modified asphalt mixture |
| CN1935903A (en) * | 2005-09-22 | 2007-03-28 | 深圳市海川实业股份有限公司 | Halogen-free roadfire-resistant asphalt |
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