Composite modified asphalt preparation process

A preparation process and asphalt technology, which is applied in building components, building insulation materials, construction, etc., can solve the problems of insufficient blending ability, strong emulsifying ability, and inappropriateness, and achieve excellent storage stability, good compatibility, and improved The effect of low temperature performance

Active Publication Date: 2012-11-14
CHINA NAT CHEM COMM CONSTR GRP CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The shearing equipment used for the preparation of modified asphalt is a high-shear emulsifier or a colloid mill. It is suitable for the shear dispersion of polymers in modified asphalt; the commonly used mixing equipment is propeller impeller mixing equipment, which is not suitable for the reaction medium with too high viscosity and the dispersion reaction that requires shear force, etc.
Neither of the above two commonly used equipment can fully mix asphalt and modifier and perform effective shear blending

Method used

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  • Composite modified asphalt preparation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The base asphalt is No. 70 road petroleum asphalt.

[0021] The chemical modifier composition includes: NCO-terminated prepolymer 55wt% (NCO content 21wt%) formed by the reaction of diphenylmethane diisocyanate and polyoxyethylene-propylene oxide copolyether polyol with a weight average molecular weight of 5500, vegetable oil polyol Alcohol (Polycin GR-35) 30.5wt%, 1,4-butanediol 1wt%, dibutyltin dilaurate 0.5wt%, aminopropyltriethoxysilane (KH-550) 8.7wt%, α-ene Propyl glycidyl ether 4.2wt%, antioxidant (BHT264) 0.1wt%.

[0022] Method 1: Heat the base asphalt to 150°C, add a chemical modifier composition of 7% of its mass, and use a propeller impeller stirrer with a rotating speed of 500 rpm for 150 minutes to obtain polyurethane modified asphalt. The specific test indicators are shown in Table 1.

[0023] Method 2: Heat the base asphalt to 150°C, add a chemical modifier composition of 7% of its mass, and use a six-flat-blade disc turbine agitator with a rotation speed of ...

Embodiment 2

[0026] The base asphalt is No. 70 road petroleum asphalt; the chemical modifier composition is the same as in Example 1; the polymer modifier is the dissolution of PSBR asphalt modifier in aromatic oil, and the mass ratio of PSBR asphalt modifier to aromatic oil It's 55:45. The total added amount of the chemical modifier composition accounts for 3wt% of the base asphalt, and the polymer modifier accounts for 3wt% of the base asphalt.

[0027] The base asphalt is heated to 150°C, polymer modifier is added, and a propeller impeller stirrer with a rotating speed of 300 rpm is used to swell and mix for 60 minutes, and then a high-speed shearing device is used to shear at a speed of 5000 rpm for 30 minutes to prepare a modified asphalt master batch. Then replace the mixing equipment with a six flat blade disc turbine agitator, adjust the speed to 1750 rpm, add the chemical modifier composition at 150° C., and continue stirring for 120 minutes to obtain a composite polymer chemically m...

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Abstract

The invention relates to composite modified asphalt preparation process, in particular to a stirring mixing device adopting sawtooth impellers or turbine impellers and applying to chemical modified asphalt. The device can expose active base groups inside an asphalt micelle through high shear force so as to promote generating of chemical reactions and can achieve full mixing of a modifying agent and asphalt through strong discharging capacity. The preparation process includes: adding a polymer modification agent after base material asphalt is heated, using a propeller impeller stirrer and swelling to obtain modified asphalt mother batch; and changing the stirrer into the turbine impeller or sawtooth impeller mixing device, adding chemical modifier composite, and keeping stirring for a period of time at the temperature of 130-180 DEG C so as to obtain composite modified asphalt products. The process effectively achieves composite of polymer modifying and chemical modifying of asphalt and obtains modified asphalt products good in compatibility and storage stability.

Description

Technical field [0001] The invention relates to a preparation process of composite modified (polymer modification + chemical modification) asphalt, and particularly mentions a mixing equipment suitable for chemically modified asphalt. Background technique [0002] With the rapid growth of highway traffic and vehicle load, the need to improve highway performance and extend highway life is extremely urgent. The use of modified asphalt materials is one of the effective ways to achieve this goal. Asphalt modification methods are divided into physical modification and chemical modification. The representative of physically modified asphalt is the most widely used SBS modified asphalt, which has relatively excellent comprehensive performance. However, the binding force between SBS modifier and petroleum asphalt comes from van der Waals force, which is much smaller than chemical bond. Therefore, SBS modified asphalt usually has compatibility problems and is prone to segregation. Chemi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29B7/00C08L95/00C08L53/02C08L9/06C08L23/08
Inventor 刘颖孙敏林凡垒杨永富徐新全张建辛星张锋
Owner CHINA NAT CHEM COMM CONSTR GRP CO LTD
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