Vegetable-oil-based polyurethane modified asphalt and mixture containing vegetable-oil-based polyurethane modified asphalt
A technology of polyurethane modification and vegetable oil modification, which is applied in building structures, building insulation materials, building components, etc., can solve the problems of complex additives and high cost of compound modification, and achieve strength improvement, service life extension, and prospects huge effect
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Embodiment 1
[0042] The preparation of vegetable oil-based polyurethane modified asphalt is as follows:
[0043] 1) Synthetic vegetable oil-based polyurethane prepolymer: under normal temperature and nitrogen protection conditions, add 0.1% orthophosphoric acid polymerization inhibitor accounting for the total mass of castor oil and liquefied MDI in a dry four-necked bottle, according to the isocyanate index R=1.6 Add liquefied MDI, stir for 5 minutes, drop the corresponding amount of dehydrated castor oil dropwise into the four-necked bottle with the dropping funnel, control the stirring speed and the dropping speed, during the reaction, add acetone solvent to adjust depending on the viscosity change of the reaction system, so that The reaction continued, and a total of 35% of the total amount of reactants was added as acetone solvent to adjust the viscosity; after the addition of castor oil was completed, the reaction was continued for 50 minutes to obtain an NCO-terminated polyurethane p...
Embodiment 2
[0047] The preparation of vegetable oil-based polyurethane modified asphalt is as follows:
[0048] 1) Synthetic vegetable oil-based polyurethane prepolymer: under normal temperature and nitrogen protection conditions, add 0.1% orthophosphoric acid polymerization inhibitor accounting for the total mass of castor oil and liquefied MDI in a dry four-necked bottle, according to the isocyanate index R=1.8 Add liquefied MDI, stir for 5 minutes, drop the corresponding amount of dehydrated castor oil dropwise into the four-necked bottle with the dropping funnel, control the stirring speed and the dropping speed, during the reaction, add acetone solvent to adjust according to the viscosity change of the reaction system, a total of Add 40% of acetone solvent to adjust the viscosity of the total amount of reactants, and continue the reaction; after the addition of castor oil is completed, continue the reaction for 50 minutes to obtain an NCO-terminated polyurethane prepolymer.
[0049] ...
Embodiment 3
[0053] The preparation of vegetable oil-based polyurethane modified asphalt is as follows:
[0054] 1) Synthetic vegetable oil-based polyurethane prepolymer: under normal temperature and nitrogen protection conditions, add 0.1% orthophosphoric acid polymerization inhibitor accounting for the total mass of castor oil and liquefied MDI in a dry four-necked bottle, according to the isocyanate index R=1.6 Add liquefied MDI, stir for 5 minutes, drop the corresponding amount of dehydrated castor oil dropwise into the four-necked bottle with the dropping funnel, control the stirring speed and the dropping speed, during the reaction, add acetone solvent to adjust according to the viscosity change of the reaction system, a total of Add 35% of acetone solvent which accounts for the total amount of reactants to adjust the viscosity, and continue the reaction; after the addition of castor oil is completed, continue the reaction for 50 minutes to obtain an NCO-terminated polyurethane prepol...
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Abstract
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