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Preparation method of modified asphalt

A technology of modified asphalt and asphalt, which is applied in the field of preparation of modified asphalt, can solve problems such as poor compatibility, poor bonding strength, and actual service life limit, and achieve improved bonding performance, improved service life, and extended durability Effect

Active Publication Date: 2014-10-29
TIANJIN SENJUKE SEAL COATING MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The current method of asphalt modification is usually to add polymer substances (such as rubber particles or powder, non-vulcanized polymer adhesive resin) to asphalt or to emulsify the asphalt, but the obtained modified asphalt is usually suitable for various substrates. The bonding strength of asphalt is poor; when it is used in the natural environment, the various components in the asphalt undergo physical and chemical changes, such as the migration of some components, oxidation or pulverization under the action of air, aging under the action of sunlight, Softening or embrittlement, adhesive attenuation, etc. under the action of high and low temperature; there is also a method of adding polyurethane prepolymer to asphalt for modification, but polyurethane prepolymer has poor compatibility with asphalt, and it is necessary to add amphiphilic substances such as hydrophilic and lipophilic However, when the modified asphalt of the above-mentioned method is used as a filler for one-component polyurethane, the bituminous substance will be lost during actual storage, transportation and use. Still prone to migration, the physical and chemical properties of the final product are changed, and the actual service life is limited

Method used

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  • Preparation method of modified asphalt
  • Preparation method of modified asphalt

Examples

Experimental program
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Embodiment 1

[0018] The total content of active hydrogen (hydrogen in OH, SH and NH) in a certain solid pitch was determined to be 0.015% (WT, weight percent). Take 100 samples, heat to 90-170°C and melt, add 38% of 150# solvent oil, stir evenly, a small amount of toluene, such as 5%, and heat at 120-140°C and vacuum to remove water, then flush into dry nitrogen conditions Next, add 11% PAPI, control the temperature at 70-110°C to react for 3-5 hours, and measure the NCO% content in the modified asphalt until the required value. When the temperature drops below 50°C, it can be flushed into dry nitrogen packaging. This is isocyanate graft modified asphalt.

Embodiment 2

[0020] The total content of active hydrogen (hydrogen in OH, SH, and NH) in a certain solid asphalt was determined to be 0.015% (percentage by weight). Take 100 parts of the sample, heat to 90-170°C to melt, add 50 parts of xylene, stir evenly, after the heating cycle removes moisture, flush into dry nitrogen, then add 5.8% m-tolyl isocyanate, the temperature is controlled at 50-90°C, React for 4-12 hours, test the NCO% content, cool down to below 50°C, fill with protective gas and pack.

Embodiment 3

[0022] Determination of the total content of active hydrogen in a certain solid asphalt is 0.015% (percentage by weight), sample 100 parts, after melting at 90-170 ° C, add 30 parts of cyclohexane and 10 parts of toluene, stir evenly, pour into After drying the nitrogen, add 13.5 parts of H12MDI, under the condition of 110-130°C, add 0.3% dibutyltin dilaurate, control the temperature at 110-130°C, react for 3-9 hours, test the content of NCO, and cool down to 50 ℃, flushed into dry nitrogen packaging.

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Abstract

The invention relates to a preparation method of modified asphalt. The method comprises the following steps: measuring the total content of active hydrogen in asphalt; heating to melt the asphalt, adding an asphalt diluent, evenly stirring, heating to a temperature of 110 to 140 DEG C, adding isocyanate with a molecular weight less than 800 in the atmosphere of dry nitrogen gas, wherein the ratio of the content of -NCO radical in isocyanate to the total content of active hydrogen radical in asphalt is (1.05-10):1; carrying out reactions for 3 to 24 hours at a controlled temperature of 40 to 150 DEG C, measuring the percentage content of -NCO group in modified asphalt until the percentage content reaches the required value; cooling, inflating dry nitrogen gas, and packaging. The displacement of the modified asphalt used as a filling material is reduced during the actual application process, thus the performance of the finish product using the modified asphalt is improved, and moreover the compatibility between a polyurethane prepolymer and asphalt is improved.

Description

technical field [0001] The invention relates to the field of modified asphalt, in particular to a preparation method of modified asphalt. Background technique [0002] The current method of asphalt modification is usually to add polymer substances (such as rubber particles or powder, non-vulcanized polymer adhesive resin) to asphalt or to emulsify the asphalt, but the obtained modified asphalt is usually suitable for various substrates. The bonding strength of asphalt is poor; when it is used in the natural environment, the various components in the asphalt undergo physical and chemical changes, such as the migration of some components, oxidation or pulverization under the action of air, aging under the action of sunlight, Softening or embrittlement, adhesive attenuation, etc. under the action of high and low temperature; there is also a method of adding polyurethane prepolymer to asphalt for modification, but polyurethane prepolymer has poor compatibility with asphalt, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10C3/02
Inventor 余建平丁海涛余浩
Owner TIANJIN SENJUKE SEAL COATING MATERIALS CO LTD