Composite modified desulfurized rubber asphalt and preparation method thereof

A desulfurized rubber, compound modification technology, applied in building components, building insulation materials, construction, etc., can solve problems such as difficult to use, high temperature performance and elastic decline, poor elastic performance, etc., to improve social and economic benefits, high and low temperature Good performance, the effect of solving rubber pollution

Inactive Publication Date: 2018-11-02
CHANGAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the rapid development of the automobile industry, a large number of waste tires are produced, and waste tires are difficult to degrade and use. Therefore, the accumulation of waste tires has caused great pressure on the environment and increased the probability of fire.
Desulfurized rubber asphalt is an asphalt material produced by desulfurization of rubber and reacting with asphalt. It can use a large number of waste tires, and has good low temperature performance, low viscosity, good construction workability and good adhesion. Therefore, it has been widely used. Research and promotion, but the research shows that after rubber desulfurization of desulfurized rubber asphalt, the three-dimensional network structure of rubber is opened, so that the rubber asphalt changes from large aggregates to small aggregates of desulfurized rubber asphalt. Compared with rubber asphalt, desulfurized rubber asphalt Asphalt has no rubber core, and the three-dimensional network structure and rubber core contribute greatly to the high-temperature performance and elastic properties of asphalt. The promotion of devulcanized rubber asphalt, and poor elastic properties are also unfavorable to its road performance

Method used

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  • Composite modified desulfurized rubber asphalt and preparation method thereof
  • Composite modified desulfurized rubber asphalt and preparation method thereof
  • Composite modified desulfurized rubber asphalt and preparation method thereof

Examples

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preparation example Construction

[0034] Such as figure 1 Shown, a kind of preparation method of composite modified devulcanized rubber asphalt comprises the following steps:

[0035] Step 1), raw materials are calculated by weight percentage: 18%-26% of devulcanized rubber, 1%-26% of composite modifier, and the rest is matrix asphalt;

[0036] Step 2), heating the base asphalt to a molten state, then adding the devulcanized rubber into the molten base asphalt, stirring evenly to obtain a mixture A;

[0037] Step 3), cutting mixture A at 160°C to 200°C for 30min to 90min; then taking it out and growing it at a constant temperature at 155-165°C to obtain mixture B;

[0038] Step 4), adding the composite modifier into the mixture B, continuously stirring and developing, and then shearing to obtain the mixture C, and developing the mixture C at a constant temperature to obtain the composite modified desulfurized rubber asphalt.

[0039] In step 2), the base asphalt is heated to 135°C-180°C to a molten state; th...

Embodiment 1

[0046] Raw materials calculated by weight percentage: general desulfurized rubber powder 22%, polyphosphoric acid compound modifier 1.25%, Dongming 70# matrix asphalt 76.75%;

[0047] Heat Dongming 70# base asphalt to 170°C to a molten state, add desulfurized rubber powder in the molten state of Dongming 70# base asphalt at 170°C, and stir at 170°C for 45 minutes to mix the devulcanized rubber in the base asphalt evenly to obtain mixture A;

[0048] Cut mixture A at 170°C with a shearing machine at a shear rate of 5000rpm / min for 45min; then take it out and develop at a constant temperature of 165°C for 60min to obtain mixture B;

[0049] Add polyphosphoric acid composite modifier to mixture B, shear at 170°C at a rate of 5000rpm / min for 45min to obtain mixture C, and develop mixture C at 165°C for 45min to obtain polyphosphoric acid composite modified desulfurization Rubberized asphalt.

Embodiment 2

[0051] Raw materials are calculated by weight percentage: 18% of general desulfurized rubber powder, 2% of polyphosphoric acid compound modifier, 80% of Shell 70# matrix asphalt;

[0052] Heat Shell 70# base asphalt to 135°C to a molten state, add desulfurized rubber powder in the molten state of Shell 70# base asphalt at 135°C, and stir at 135°C for 55 minutes to mix the devulcanized rubber in the base asphalt evenly to obtain mixture A;

[0053] Mixture A was cut at 135°C with a shearing machine at a shear rate of 6000rpm / min for 60min; then it was taken out and grown at a constant temperature of 155°C for 50min to obtain mixture B;

[0054] Add the polyphosphoric acid composite modifier to the mixture B, cut at 175°C for 55 minutes at a rate of 6000rpm / min to obtain the mixture C, and develop the mixture C at 180°C for 40 minutes to obtain the polyphosphoric acid composite modified desulfurization Rubberized asphalt.

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Abstract

The invention discloses composite modified desulfurized rubber asphalt and a preparation method thereof. After desulfurized rubber powder is added into matrix asphalt, the desulfurized rubber powder is evenly dispersed in the matrix asphalt, then the evenly-dispersed mixture is subjected to shearing, and the desulfurized rubber powder is finer through shearing under high-speed rotation, so that more reaction opportunities of the desulfurized rubber powder and the light component are created, then through a development technology, the desulfurized rubber powder swells in the matrix asphalt to form desulfurized rubber asphalt with good performance, after the desulfurized rubber asphalt is prepared, a composite modifying agent is added, a shearing technology is conducted, polyphosphoric aciddisperses more evenly in the desulfurized rubber asphalt, the reaction depth is improved, and through development, the polyphosphoric acid better swells in the desulfurized rubber asphalt to form thecomposite modified desulfurized rubber asphalt with good performance. The obtained composite modified desulfurized rubber asphalt is good in environment-friendly performance and high-and-low temperature performance, low in applicable viscosity and good in storage stability.

Description

technical field [0001] The invention belongs to the field of road engineering design, and in particular relates to a composite modified desulfurized rubber asphalt and a preparation method thereof. Background technique [0002] With the rapid development of the automobile industry, a large number of waste tires are produced, and waste tires are difficult to degrade and use. Therefore, the accumulation of waste tires has caused great pressure on the environment and increased the probability of fire. Desulfurized rubber asphalt is an asphalt material produced by desulfurization of rubber and reacting with asphalt. It can use a large number of waste tires, and has good low temperature performance, low viscosity, good construction workability and good adhesion. Therefore, it has been widely used. Research and promotion, but the research shows that after rubber desulfurization of desulfurized rubber asphalt, the three-dimensional network structure of rubber is opened, so that the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L95/00C08L53/02C08L19/00C08K3/32
CPCC08K2003/329C08L95/00C08L2201/08C08L2205/025C08L2205/03C08L19/003C08K3/32C08L53/02
Inventor 张争奇李卓琳刘恒彬卢川王佳蓉
Owner CHANGAN UNIV
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