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Preparation method of waste rubber modified emulsified asphalt

A technology for emulsified asphalt and waste rubber, applied in the production of bulk chemicals, building components, building insulation materials, etc., can solve the problems of complex process and low solid content of emulsified asphalt, achieve simple process, energy saving and environmental protection price, and improve performance indicators Effect

Inactive Publication Date: 2012-09-12
CHINA RUBBER RESOURCE REGENERATION QINGDAO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is complicated in process, and two kinds of latex are used to modify the emulsified asphalt, and the solid content in the emulsified asphalt is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] First, add 60-mesh rubber powder into the high-temperature and high-pressure reactor, use diphenyl disulfide (DD) as the activator, and use CO 2 After replacing the air in the autoclave with gas, add dry ice to make the CO in the autoclave 2 Density maintained at 0.466g / cm 3 . Gradually raise the temperature to 170°C and react at this temperature for 120 minutes to obtain rubber with high sol content, and then shear in a high-speed internal mixer for 20 minutes to obtain fluid rubber. Heating the AH-90 base asphalt to 130°C~140°C and then mixing it with fluid rubber at 190°C for a short period of time and continuous high-speed shear mixing to obtain waste rubber modified asphalt, the shearing time is 50min; Add non-ionic emulsifier, stabilizer NaCl, thickener polyvinyl alcohol (PVA) and pH regulator into warm deionized water according to the ratio, stir well, and heat to 50℃~60℃ to prepare soap liquid; prepare Good modified asphalt and soap solution are mixed, stirred...

Embodiment 2

[0042] First, add 40-mesh rubber powder into the high-temperature and high-pressure reactor, use diphenyl disulfide (DD) as the activator, and use CO 2 After replacing the air in the autoclave with gas, add dry ice to make the CO in the autoclave 2 Density maintained at 0.55g / cm 3 . Gradually raise the temperature to 180°C and react at this temperature for 180 minutes to obtain rubber with high sol content, and then shear in a high-speed internal mixer for 20 minutes to obtain fluid rubber. Heat the AH-90 base asphalt to 130°C-140°C, and then mix it with fluid rubber at 190°C for a short period of time to obtain waste rubber modified asphalt. The shearing time is 60 minutes; the cation is emulsified agent, stabilizer CaCl 2 , Thickener polyvinyl alcohol (PVA) and pH adjuster are added to warm deionized water according to the ratio, fully stirred, and heated to 50 ℃ ~ 60 ℃ to prepare a soap solution; mix the prepared modified asphalt with the soap solution Afterwards, stir e...

Embodiment 3

[0051] First, add 60-mesh rubber powder into the high-temperature and high-pressure reactor, use mercaptan as the activator, and use CO 2 After replacing the air in the autoclave with gas, add dry ice to make the CO in the autoclave 2 Density maintained at 0.6g / cm 3 . Gradually raise the temperature to 150°C and react at this temperature for 200 minutes to obtain rubber powder with high sol content, and then shear in a high-speed internal mixer for 15 minutes to obtain fluid rubber. Heat the AH-70 base asphalt to 130°C~140°C, and then mix it with fluid rubber at 190°C for a short period of time to obtain waste rubber-modified asphalt. The shear time is 45 minutes; the cation is emulsified agent, CaCl 2 , modified starch and pH regulator are added into warm deionized water according to the ratio, fully stirred, and heated to 50°C~60°C to prepare soap liquid; mix the prepared modified asphalt with soap liquid, stir evenly and shear at high speed Cut for 3min, the speed is 140...

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Abstract

The invention relates to a preparation method of waste rubber modified emulsified asphalt, which belongs to the field of modified asphalt. The method comprises the following steps of: mixing waste rubber with an activating agent in supercritical CO2, preparing into rubber with high sol content with a high-temperature and high-pressure method, and shearing in a high-speed internal mixer to obtain fluid rubber; and performing short-time initial mixing and continuous high-speed shearing mixing on substrate asphalt and the fluid rubber to obtain modified asphalt, and shearing and emulsifying under the action of a cationic emulsifier system into waste rubber modified emulsified asphalt. The waste rubber modified emulsified asphalt prepared with the method is stored stably, and the high and low temperature properties of the modified asphalt are improved due to the addition of rubber. Meanwhile, waste rubber is used for modifying emulsified asphalt, so that environmental protection is facilitated, and cost is reduced; and meanwhile, a process is simple, and industrial production is easy.

Description

technical field [0001] The invention relates to a preparation method of waste rubber modified emulsified asphalt, which belongs to the field of road construction. Background technique [0002] Emulsified asphalt means that asphalt is thermally melted and subjected to mechanical shearing, and is dispersed in a state of fine particles in an aqueous solution containing an emulsifier to form an oily asphalt emulsion. When emulsified asphalt is used, it can be constructed at room temperature without heating. In road engineering, emulsified asphalt is suitable for asphalt surface treatment pavement, asphalt penetration pavement, normal temperature asphalt mixture pavement, and penetration layer, adhesive layer and sealing layer, etc. Compared with conventional asphalt and hot asphalt, the application of emulsified asphalt and its comprehensive performance have the characteristics of being harmless to human body, safe and non-polluting to the environment. [0003] The purpose of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L95/00C08L21/00C08L1/26C08L3/04C08L89/00C08L29/04C08K13/02C08K5/372C08K5/37C08K3/16C08J3/03
CPCY02P20/54
Inventor 董大伟刘晶晶郑广宇江宽张立群李晓林
Owner CHINA RUBBER RESOURCE REGENERATION QINGDAO
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