CN102850506B - Preparation method of polyurethane modified asphalt - Google Patents
Preparation method of polyurethane modified asphalt Download PDFInfo
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- CN102850506B CN102850506B CN201210307108.6A CN201210307108A CN102850506B CN 102850506 B CN102850506 B CN 102850506B CN 201210307108 A CN201210307108 A CN 201210307108A CN 102850506 B CN102850506 B CN 102850506B
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- asphalt
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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 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, compared with cement concrete pavement, bituminous pavement have without seam, drive a vehicle comfortable, vibrate the advantages such as little, noise is low.But plain asphalt is strong to temperature sensitivity, low temperature embrittlement below 0 ℃, viscosity is low, snappiness is poor, gives at extremely frigid zones and uses and brought much 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: owing to just simply properties-correcting agent being added, carry out physical blending in pitch, thereby the easy problem that produces 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 existing in order to overcome existing modifying asphalt, the object of this invention is to provide a kind of preparation method of polyurethane-modified pitch, this preparation method carries out chemical modification by plain asphalt, first on asphaltene molecule, introduce hydroxyl, by hydroxyl, react again the polyurethane-modified pitch making with isocyano, can meet road in alpine region use properties, extend Road Service Life.
The object of the invention is to be achieved through the following technical solutions:
A preparation method for polyurethane-modified pitch, is characterized in that it is under initiator effect, and pitch and vinyl carbinol are reacted and made, and comprises the steps:
1) pitch is dropped in reactor; Described pitch is one or more mixtures in petroleum pitch, oxidized bitumen, coal-tar pitch or 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, azo-bis-iso-dimethyl.
3) at 80～160 ℃ of temperature to the vinyl carbinol that adds pitch weight 1～10% in above-mentioned reactor, pressure maintains 0.1～0.4MPa, reaction 3-6 hour; Described vinyl carbinol chemical structural formula is CH
2=CH-CH
2oH.
4) then in above-mentioned reaction product, drip isocyanic ester, 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 by plain asphalt, first on asphaltene molecule, introduces hydroxyl, then reacts by hydroxyl the polyurethane-modified pitch making with isocyano, can meet road in alpine region use properties, extends Road Service Life.
Embodiment
Below by specific embodiment, the present invention is further illustrated, but each embodiment is not all to concrete restriction of the present invention.
Embodiment 1
A preparation method for polyurethane-modified pitch, under initiator effect, reacts pitch and vinyl carbinol and make, and comprises the steps:
By the 100 parts of (quality of petroleum pitch that are warmed up to 90-130 ℃, add reactor down together), add 0.3 part of benzoyl peroxide, add again 3 parts of vinyl carbinols, heat up and control 120-135 ℃, and pass into N2 and make reactor pressure remain on 0.2MPa, react 3 hours, then be controlled at 70 ℃, drip 3.6 parts of tolylene diisocyanates, after filtration, obtain the polyurethane-modified pitch that low-temperature flexibility is greatly improved.
Embodiment 2
A preparation method for polyurethane-modified pitch, under initiator effect, reacts pitch and vinyl carbinol and make, and comprises the steps:
By the 100 parts of (quality of petroleum pitch that are warmed up to 90-130 ℃, add reactor down together), add 0.3 part of ammonium persulphate, add again 10 parts of vinyl carbinols, heat up and control 120-135 ℃, and pass into N2 and make reactor pressure remain on 0.2MPa, react 3 hours, then be controlled at 80 ℃, drip 30 parts of diphenylmethanediisocyanates, after filtration, obtain the polyurethane-modified pitch that low-temperature flexibility is greatly improved.
Embodiment 3
A preparation method for polyurethane-modified pitch, under initiator effect, reacts pitch and vinyl carbinol and make, and comprises the steps:
100 parts of lake pitch that are warmed up to 130 ℃ are added to reactor, add 1 part of benzoyl peroxide, add again 10 parts of vinyl carbinols, heat up and control 120-135 ℃, and pass into N2 and make reactor pressure remain on 0.2MPa, react 3 hours, be then controlled at 130 ℃, drip repeatedly methylene radical polyisocyanates (polymeric MDI) of phenyl more than 40 parts, after filtration, obtain the polyurethane-modified pitch that low-temperature flexibility is greatly improved.
Claims (2)
1. a preparation method for polyurethane-modified pitch, is characterized in that it is under initiator effect, and pitch and vinyl carbinol are reacted and made, and comprises the steps:
1) pitch is dropped in reactor;
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, azo-bis-iso-dimethyl;
3) at 80～160 ℃ of temperature to the vinyl carbinol that adds pitch weight 1～10% in above-mentioned reactor, pressure maintains 0.1～0.4MPa, reaction 3-6 hour; Described vinyl carbinol chemical structural formula is CH
2=CH-CH
2oH;
4) then in above-mentioned reaction product, drip isocyanic ester, 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, is characterized in that: in step 1), described pitch is one or more mixtures in petroleum pitch, oxidized bitumen, coal-tar pitch or lake pitch.
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 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210307108.6A CN102850506B (en) | 2012-08-27 | 2012-08-27 | Preparation method of polyurethane modified asphalt |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102850506A CN102850506A (en) | 2013-01-02 |
| CN102850506B true CN102850506B (en) | 2014-04-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210307108.6A Active CN102850506B (en) | 2012-08-27 | 2012-08-27 | Preparation method of polyurethane modified asphalt |
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Families Citing this family (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 |
| CN113667315B (en) * | 2021-08-20 | 2022-10-14 | 华中科技大学 | Polymer modified asphalt and preparation method 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 |
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 |
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| CN102850506A (en) | 2013-01-02 |
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