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Moisture cured polyurethane modified cold-mixed asphalt and preparation method thereof

A technology of polyurethane modification and cold-mix asphalt, which is applied in building components, building insulation materials, buildings, etc. It can solve the problems of low stability of cold-mix asphalt, long curing time, complicated process, etc., and achieve convenient and easy construction Good, good curing effect

Pending Publication Date: 2021-08-13
郑州中科新兴产业技术研究院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention proposes a wet-curing polyurethane modified cold-mix asphalt and its preparation method, which solves the problems of low stability of cold-mix asphalt, long curing time or complex process and cannot be preserved

Method used

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  • Moisture cured polyurethane modified cold-mixed asphalt and preparation method thereof

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Effect test

Embodiment 1

[0026] A kind of moist curing polyurethane modified cold mix asphalt and its preparation method, the steps are as follows:

[0027] (1) Add 1 part (parts by weight, the same below) of toluene diisocyanate (TDI) into the reactor and raise the temperature to 80°C, add 4 parts of polypropylene glycol with a molecular weight of 1500 into the reactor in two times, maintain the temperature at 80°C and stir the reaction 90min, obtained isocyanate-terminated linear polyurethane prepolymer;

[0028] (2) Add 70 parts of base asphalt into the shearing stirring tank and heat it to 100°C to make it completely melted, then add 15 parts of diesel oil, 3 parts of polyethylene wax, 5 parts of polyurethane prepolymer, and 1 part of calcium chloride desiccant in sequence. Shear mixing at 1500r / min for 90min to prepare polyurethane modified cold mix asphalt;

[0029] (3) Cool the polyurethane-modified cold-mix asphalt to 70°C, add 2 parts of sulfur powder stabilizer, 0.5 part of methyl isopropyl...

Embodiment 2

[0031] A kind of moist curing polyurethane modified cold mix asphalt and its preparation method, the steps are as follows:

[0032] (1) Add 2 parts of diphenylmethane diisocyanate (MDI) into the reactor and raise the temperature to 90°C, and add 8 parts of ethylene glycol-propylene glycol-ethylene glycol triblock copolymer with a molecular weight of 2000 into the reactor in two times , maintaining the temperature at 90°C and stirring for 60 minutes to prepare the isocyanate-terminated linear polyurethane prepolymer;

[0033] (2) Add 75 parts of base asphalt to the shearing stirring tank and heat it to 120°C to make it completely melted, then add 20 parts of 200# solvent oil, 2 parts of dioctyl phthalate, 10 parts of polyurethane prepolymer, 4 parts Magnesium sulfate desiccant, shear and mix for 60 minutes at a rate of 2000r / min, to obtain polyurethane modified cold mix asphalt;

[0034] (3) Cool the polyurethane-modified cold-mix asphalt to 80°C, add 3 parts of cellulose stab...

Embodiment 3

[0036] A kind of moist curing polyurethane modified cold mix asphalt and its preparation method, the steps are as follows:

[0037] (1) Add 3 parts of hexamethylene diisocyanate (HDI) into the reactor and raise the temperature to 70°C, add 12 parts of polytetrahydrofuran ether diol with a molecular weight of 1200 into the reactor in three times, maintain the temperature at 70°C and stir for 120 minutes. Prepared isocyanate-terminated linear polyurethane prepolymer;

[0038] (2) Add 60 parts of base asphalt into the shearing stirring tank and heat it to 90°C to make it completely melted, then add 10 parts of 180# solvent oil, 5 parts of sasobit resin, 15 parts of polyurethane prepolymer, and 3 parts of quicklime desiccant in sequence. Shear mixing at 1000r / min for 120min to prepare polyurethane modified cold mix asphalt;

[0039] (3) Cool the polyurethane modified cold mix asphalt to 60°C, add 1 part of rubber oil stabilizer, 1.5 parts of acetophenone-m-phenylenediamine type k...

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Abstract

The invention provides a moisture cured polyurethane modified cold-mixed asphalt and a preparation method thereof. The moisture cured polyurethane modified cold-mixed asphalt is prepared from, by weight, 60-75 parts of matrix asphalt, 10-20 parts of a solvent, 5-15 parts of a polyurethane prepolymer, 2-5 parts of a plasticizer, 1-4 parts of a drying agent, 1-3 parts of a stabilizer and 0.5-1.5 parts of a moisture curing agent. The polyurethane prepolymer is an isocyanate-terminated base line type polymer prepared from polyether glycol and diisocyanate, and the moisture curing agent is a ketimine curing agent. The prepared cold-mixed asphalt mixture can be mixed and paved at normal temperature / low temperature, moisture induces the polyurethane prepolymer to be crosslinked and cured after paving, the strength formation of a cold-mixed asphalt pavement is accelerated, the Marshall stability is 7.7-8.6 KN, the residual stability is larger than 90%, and the requirement for rapid traffic of the cold-mixed asphalt pavement is met.

Description

technical field [0001] The invention relates to the technical field of road materials, in particular to a damp-cured polyurethane modified cold-mix asphalt and a preparation method thereof. Background technique [0002] Cold mix asphalt mixture has the advantages of energy saving, environmental protection, storability, and convenient construction, but there are common key engineering problems such as low initial stability and poor anti-rutting performance. At present, the modification of cold-mix asphalt with polymer materials such as epoxy resin, polyurethane, SBR, and SBS can improve the road performance of cold-mix asphalt mixture to a certain extent, but the nature of its low stability and long curing time It has not changed and cannot meet the needs of timely opening to traffic after paving, which limits its development and large-scale engineering application. [0003] Different from the above-mentioned storable cold-mix asphalt mixture, patent CN106977966A proposes a ...

Claims

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Application Information

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IPC IPC(8): C08L95/00C08L75/08C08K3/16C08K3/30C08K3/22C08G18/10C08G18/66C08G18/48C08G18/32C08G18/50C08G18/60
CPCC08G18/10C08G18/3256C08G18/48C08G18/4841C08G18/4854C08G18/503C08G18/603C08K2003/162C08K2003/2206C08K2003/3063C08L95/00C08L2555/28C08L75/08C08K3/16C08K3/30C08K3/22C08G18/60C08G18/50
Inventor 张敏鑫杜俊涛聂毅王振中孔令晨郏慧娜刘泽涛熊桥梁
Owner 郑州中科新兴产业技术研究院
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