CN102850506A - Preparation method of polyurethane modified asphalt - Google Patents
Preparation method of polyurethane modified asphalt Download PDFInfo
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- CN102850506A CN102850506A CN2012103071086A CN201210307108A CN102850506A CN 102850506 A CN102850506 A CN 102850506A CN 2012103071086 A CN2012103071086 A CN 2012103071086A CN 201210307108 A CN201210307108 A CN 201210307108A CN 102850506 A CN102850506 A CN 102850506A
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- pitch
- asphalt
- polyurethane
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- Polyurethanes Or Polyureas (AREA)
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Abstract
The invention discloses a preparation method of polyurethane modified asphalt. Asphalt reacts with allyl alcohol to prepare hydroxy asphalt in the presence of an initiator, and the hydroxy asphalt reacts with isocyanate to prepare polyurethane modified asphalt. The method comprises the steps of: first adding asphalt into a reactor; adding the initiator 0.05-1wt% of the asphalt into the reactor; adding allyl alcohol 1-10 wt% of the asphalt at 80-160 DEG C to the reactor, maintaining the pressure at 0.1-0.4MPa and reacting for 3-6 h; then dropwise adding isocyanate to the reaction products at a reaction temperature of 70-130 DEG C; and filtering the obtain the polyurethane modified asphalt. The chemically modified asphalt provided by the invention has excellent low temperature performance, greatly improves shortcomings of ordinary asphalt, such as low temperature brittleness and poor flexibility, and can meet usage property for road in cold area, and prolong the service life of the road.
Description
Technical field
The invention belongs to the pitch chemical modification technique, relate to a kind of preparation method of modifying asphalt, specifically a kind of preparation method of polyurethane-modified pitch.
Background technology
Pitch is widely used in road pavement, pavement maintenance and maintenance, compares with cement concrete pavement, and bituminous pavement has without seam, the advantage such as driving is comfortable, vibration is little, noise is low.But plain asphalt is strong to temperature sensitivity, and at low temperature embrittlement below 0 ℃, viscosity is low, snappiness is poor, gives in the extremely frigid zones use and has brought many inconvenience.In order to overcome the shortcoming of plain asphalt, both at home and abroad asphalt modification is studied, modifying asphalt is to add properties-correcting agent in pitch, and the performance of pitch or asphalt is improved.Wherein, properties-correcting agent mostly is: rubber, resin, high molecular polymer, levigate rubber powder or other fillers etc.The shortcoming of this asphalt modification method is: carry out physical blending in the pitch owing to just simply properties-correcting agent is added, thereby the easy problem that produces the segregation layering, and for pitch strong to temperature sensitivity, viscosity is low, snappiness is poor etc., and though problem is improved, effect is undesirable.
Summary of the invention
The problem that exists in order to overcome existing modifying asphalt, the preparation method who the purpose of this invention is to provide a kind of polyurethane-modified pitch, this preparation method carries out chemical modification with plain asphalt, at first introduce hydroxyl at asphaltene molecule, the polyurethane-modified pitch that makes by hydroxyl and isocyano reaction again, can satisfy the road in alpine region use properties, prolong Road Service Life.
The objective of the invention is to be achieved through the following technical solutions:
A kind of preparation method of polyurethane-modified pitch is characterized in that it under the initiator effect, with the reaction of pitch and vinyl carbinol and make, comprises the steps:
1) pitch is dropped in the reactor; Described pitch is one or more mixtures in petroleum pitch, oxidized bitumen, coal-tar pitch or the lake pitch, preferably petroleum pitch.
2) in above-mentioned reactor, add initiator; The weight of initiator is 0.05～1% of pitch; Described initiator is one or more mixtures in Potassium Persulphate, ammonium persulphate, benzoyl peroxide, Diisopropyl azodicarboxylate, the azo-bis-iso-dimethyl.
3) add the vinyl carbinol of pitch weight 1～10% in the above-mentioned reactor under 80～160 ℃ of temperature, pressure maintains 0.1～0.4MPa, reacts 3-6 hour; Described vinyl carbinol chemical structural formula is CH
2=CH-CH
2OH.
4) then drip isocyanic ester in above-mentioned reaction product, isocyanic ester weight is 1.2～4 times of vinyl carbinol weight, and 70～130 ℃ of temperature of reaction are filtered and obtained polyurethane-modified pitch.
This preparation method carries out chemical modification with plain asphalt, at first introduces hydroxyl at asphaltene molecule, and the polyurethane-modified pitch that makes by hydroxyl and isocyano reaction again can satisfy the road in alpine region use properties, prolongs Road Service Life.
Embodiment
The present invention is further illustrated below by specific embodiment, but each embodiment all is not to concrete restriction of the present invention.
Embodiment 1
A kind of preparation method of polyurethane-modified pitch under the initiator effect, with the reaction of pitch and vinyl carbinol and make, comprises the steps:
With the 100 parts of (quality of petroleum pitch that are warmed up to 90-130 ℃, together lower) the adding reactor, add 0.3 part of benzoyl peroxide, add again 3 parts of vinyl carbinols, 120-135 ℃ of the control that heats up, and pass into N2 and make reactor pressure remain on 0.2MPa, reacted 3 hours, then be controlled at 70 ℃, drip 3.6 parts of tolylene diisocyanates, obtain the polyurethane-modified pitch that low-temperature flexibility is greatly improved after the filtration.
Embodiment 2
A kind of preparation method of polyurethane-modified pitch under the initiator effect, with the reaction of pitch and vinyl carbinol and make, comprises the steps:
With the 100 parts of (quality of petroleum pitch that are warmed up to 90-130 ℃, together lower) the adding reactor, add 0.3 part of ammonium persulphate, add again 10 parts of vinyl carbinols, 120-135 ℃ of the control that heats up, and pass into N2 and make reactor pressure remain on 0.2MPa, reacted 3 hours, then be controlled at 80 ℃, drip 30 parts of diphenylmethanediisocyanates, obtain the polyurethane-modified pitch that low-temperature flexibility is greatly improved after the filtration.
Embodiment 3
A kind of preparation method of polyurethane-modified pitch under the initiator effect, with the reaction of pitch and vinyl carbinol and make, comprises the steps:
With 100 parts of addings of the lake pitch reactor that is warmed up to 130 ℃, add 1 part of benzoyl peroxide, add again 10 parts of vinyl carbinols, 120-135 ℃ of control heats up, and pass into N2 and make reactor pressure remain on 0.2MPa, reacted 3 hours, then be controlled at 130 ℃, drip repeatedly methylene radical polyisocyanates (polymeric MDI) of phenyl more than 40 parts, obtain the polyurethane-modified pitch that low-temperature flexibility is greatly improved after the filtration.
Claims (4)
1. the preparation method of a polyurethane-modified pitch is characterized in that it under the initiator effect, with the reaction of pitch and vinyl carbinol and make, comprises the steps:
1) pitch is dropped in the reactor;
2) in above-mentioned reactor, add initiator; The weight of initiator is 0.05～1% of pitch;
3) add the vinyl carbinol of pitch weight 1～10% in the above-mentioned reactor under 80～160 ℃ of temperature, pressure maintains 0.1～0.4MPa, reacts 3-6 hour;
4) then drip isocyanic ester in above-mentioned reaction product, isocyanic ester weight is 1.2～4 times of vinyl carbinol weight, and 70～130 ℃ of temperature of reaction are filtered and obtained polyurethane-modified pitch.
2. the preparation method of polyurethane-modified pitch according to claim 1, it is characterized in that: in step 1), described pitch is one or more mixtures in petroleum pitch, oxidized bitumen, coal-tar pitch or the lake pitch.
3. the preparation method of polyurethane-modified pitch according to claim 1, it is characterized in that: in step 2) in, described initiator is one or more mixtures in Potassium Persulphate, ammonium persulphate, benzoyl peroxide, Diisopropyl azodicarboxylate, the azo-bis-iso-dimethyl.
4. the preparation method of polyurethane-modified pitch according to claim 1, it is characterized in that: in step 3), described vinyl carbinol chemical structural formula is CH
2=CH-CH
2OH.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210307108.6A CN102850506B (en) | 2012-08-27 | 2012-08-27 | Preparation method of polyurethane modified asphalt |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210307108.6A CN102850506B (en) | 2012-08-27 | 2012-08-27 | Preparation method of polyurethane modified asphalt |
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| Publication Number | Publication Date |
|---|---|
| CN102850506A true CN102850506A (en) | 2013-01-02 |
| CN102850506B CN102850506B (en) | 2014-04-16 |
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| CN201210307108.6A Active CN102850506B (en) | 2012-08-27 | 2012-08-27 | Preparation method of polyurethane modified asphalt |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107177210A (en) * | 2017-06-21 | 2017-09-19 | 长安大学 | A kind of polyurethane-modified pitch and preparation method thereof |
| CN113667315A (en) * | 2021-08-20 | 2021-11-19 | 华中科技大学 | Polymer modified asphalt and preparation method thereof |
| CN113930079A (en) * | 2021-09-09 | 2022-01-14 | 长春建业集团股份有限公司 | Modified asphalt, preparation method and application thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1440988A (en) * | 2002-05-31 | 2003-09-10 | 段友芦 | Aquious carbaminate-olefine hybrid polymer dispersing liquid and its prepn and use |
| CN1696167A (en) * | 2005-05-17 | 2005-11-16 | 孟鋆辉 | Poly aminoester foamed plastics of carbobitumen |
| CN101397358A (en) * | 2008-10-31 | 2009-04-01 | 句容市宁武化工有限公司 | Method for preparing modified asphalt |
-
2012
- 2012-08-27 CN CN201210307108.6A patent/CN102850506B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1440988A (en) * | 2002-05-31 | 2003-09-10 | 段友芦 | Aquious carbaminate-olefine hybrid polymer dispersing liquid and its prepn and use |
| CN1696167A (en) * | 2005-05-17 | 2005-11-16 | 孟鋆辉 | Poly aminoester foamed plastics of carbobitumen |
| CN101397358A (en) * | 2008-10-31 | 2009-04-01 | 句容市宁武化工有限公司 | Method for preparing modified asphalt |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107177210A (en) * | 2017-06-21 | 2017-09-19 | 长安大学 | A kind of polyurethane-modified pitch and preparation method thereof |
| CN113667315A (en) * | 2021-08-20 | 2021-11-19 | 华中科技大学 | Polymer modified asphalt and preparation method thereof |
| CN113930079A (en) * | 2021-09-09 | 2022-01-14 | 长春建业集团股份有限公司 | Modified asphalt, preparation method and application thereof |
| CN113930079B (en) * | 2021-09-09 | 2023-09-26 | 长春建业集团股份有限公司 | Modified asphalt, preparation method and application thereof |
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| Publication number | Publication date |
|---|---|
| CN102850506B (en) | 2014-04-16 |
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