Preparation method for polymer microcapsule modified emulsified bitumen

A technology of emulsified asphalt and microcapsules, which is applied to building structures, building components, building insulation materials, etc., can solve the problems of poor compatibility, long-term stability, poor emulsifier performance, and high emulsification temperature, achieving good stability, Improved performance and simple preparation process

Active Publication Date: 2012-02-15
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Inevitably, there are disadvantages such as poor compatibility between polymer and asphalt, poor long-term stability and emulsifier performance, high emulsification temperature (generally above 150 degrees), which is also the current problem faced by the field of polymer modified emulsified asphalt production. technical problems

Method used

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  • Preparation method for polymer microcapsule modified emulsified bitumen

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] After ultrasonically mixing 400g of base asphalt with an aqueous solution containing 30g of fatty alcohol polyoxyethylene ether sodium sulfate to obtain a uniform solution, add 10g (the mixture of methacrylic acid, styrene, methyl acrylate and isocyanate, the mass ratio of each component is 2: 70: 10: 3) to swell for 2 hours, heat up to 90°C, use 3g of initiator to fully polymerize for 3 hours, add 30g of the above monomers and 10g of dibenzoyl peroxide to continue the reaction for 3 hours, cool down, filter After removing the residue, adjust the pH value of the stock solution to alkaline with NaOH to obtain polymer microcapsule-modified emulsified asphalt.

[0017] The particle size of emulsified asphalt modified by polymer microcapsules was 2180nm, and the dispersion index was 0.134.

Embodiment 2

[0019] 500g base asphalt and the aqueous solution containing 8g lauryl amidopropyl betaine are ultrasonically mixed to obtain a uniform solution, then add 20g monomer (sodium ammonium acrylate, styrene, tetrahydrofuryl methacrylate and silane mixture, the mass of each component The ratio is 11:270:100:11) to swell for 5 hours, heat up to 80°C, and after fully polymerizing with 6g of sodium persulfate for 3 hours, add 80g of the above-mentioned monomer and 20g of sodium persulfate to continue the reaction for 8 hours, cool down and filter After removing the residue, adjust the pH value of the stock solution to alkaline with NaOH to obtain polymer microcapsule-modified emulsified asphalt.

[0020] The particle size of the emulsified asphalt modified by the test polymer microcapsules is 2330nm, and the dispersion index is 0.152.

Embodiment 3

[0022] After ultrasonically mixing 300g of base asphalt with an aqueous solution containing 85g of fatty alcohol polyoxyethylene ether succinate sodium sulfonate to obtain a uniform solution, add 10g of monomers (sodium acrylate, copper acrylate, styrene, isobutyl methacrylate) The mixture with melamine (the mass ratio of each component is 10:11:570:400:31) swells for 4 hours, heats up to 85°C, and fully polymerizes with 8g of V-50 initiator for 2 hours, then adds 80g of the above-mentioned monomers Continue to react with 40g V-50 initiator for 10 hours, lower the temperature and cool down, filter off the residue and adjust the pH value of the stock solution to alkaline with NaOH to obtain polymer microcapsule modified emulsified asphalt.

[0023] The particle size of the emulsified asphalt modified by the test polymer microcapsules is 2210nm, and the dispersion index is 0.092.

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Abstract

The invention discloses a preparation method for polymer microcapsule modified emulsified bitumen, which belongs to the technical field of modification of bitumen. A polymer shell layer is formed through microcapsule in-situ cladding and crosslinking on the surface of bitumen microballoons by using the method of miniemulsion polymerization, and an organic/inorganic composite core-shell structure is formed. After the polymer microcapsule modified emulsified bitumen becomes a film, an interpenetrating polymer network of a polymer and bitumen is formed; the polymer microcapsule modified emulsified bitumen has the characteristics of an organic/inorganic composite, better heat resistance and a high softening point; a mixture fabricated with the polymer microcapsule modified emulsified bitumen has good resistance to permanent deformation, can prevent harmful damage like formation of ruts on a pavement in high temperature seasons and better adapts to needs for pavement construction and maintenance in hot areas. Since the polymer microcapsule modified emulsified bitumen has the characteristic of modification by the polymer, the emulsified bitumen has improved toughness and good crack resistance, and can be extensively used in the fields like emulsified bitumen cement mortar for plate type ballastless tracks of high-speed railways or urban light rails.

Description

technical field [0001] The invention belongs to the technical field of asphalt modification, and in particular relates to a preparation method of emulsified asphalt modified by polymer microcapsules. Background technique [0002] Asphalt is a kind of material widely used in road traffic and waterproof engineering. The biggest disadvantage of asphalt is its temperature sensitivity. It is easy to be brittle in winter and easy to soften in summer. With the rapid development of the national economy in modern society, the traffic flow and driving frequency have increased sharply, and the load-bearing capacity of vehicles has continued to increase. At the same time, road facilities are required to withstand more severe high and low temperature climatic conditions, with better durability and reduced maintenance workload. Modern engineering requires that asphalt should still have proper elasticity and plasticity at low temperatures, and have certain strength and thermal stability a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L95/00C08L25/14C08F212/08C08F220/14C08F220/06C08F220/32C08F220/18C08F2/24
Inventor 孔祥明吴纯超张珍林
Owner TSINGHUA UNIV
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