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High-viscosity modified asphalt based on SBS/polyurethane compounding and preparation method thereof

A technology of modified asphalt and polyurethane, which is applied to building components, building insulation materials, buildings, etc., can solve the problems of poor storage stability and high price of high-viscosity modified asphalt, and achieves the improvement of storage stability and reduction of polymer blending. The effect of good quantity and good storage stability

Inactive Publication Date: 2019-04-02
ZHENGZHOU UNIVERSITY OF AERONAUTICS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The object of the present invention is to provide a kind of high-viscosity modified asphalt based on SBS / polyurethane compound and preparation method thereof, to solve the defects of existing high-viscosity modified asphalt such as high price and poor storage stability; it is used for drainage In asphalt pavement, it can not only improve the durability of the pavement, but also reduce the processing cost, and the cost performance is better

Method used

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  • High-viscosity modified asphalt based on SBS/polyurethane compounding and preparation method thereof

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Comparison scheme
Effect test

Embodiment 1

[0044] A high-viscosity modified asphalt based on SBS / polyurethane composite, in parts by mass, is composed of the following materials: 3 parts of polyurethane prepolymer H2122A, 3 parts of star-shaped SBS modifier, 100 parts of 70# matrix asphalt, Chain agent MOCA 0.4 part and coupling agent KH550 2 parts, sulfur-free compound stabilizer is 1.0‰ of the mass of SBS modifier.

[0045] The composite modified asphalt of the present embodiment is prepared according to the following steps:

[0046] (1) Slowly add SBS modifier after heating 70# base asphalt to 155°C, and use a mixer to stir at low speed, stir and swell for 30min after adding SBS, and keep the temperature at 155°C;

[0047] (2) After rapidly heating the mixture of asphalt and SBS modifier to 165°C, use a high-speed shearing machine for processing, the rotational speed is 4000r / min, the time is 30min, and the temperature of the mixture during the shearing process is 165°C;

[0048] (3) adding a stabilizer to the shea...

Embodiment 2

[0053] A high-viscosity modified asphalt based on SBS / polyurethane composite, in parts by mass, is composed of the following materials: 4 parts of polyurethane prepolymer H2122A, 4 parts of star-shaped SBS modifier, 100 parts of 70# matrix asphalt, 0.6 part of chain agent MOCA and 3 parts of coupling agent KH550, sulfur-free compound stabilizer is 1.0‰ of the mass of SBS modifier.

[0054] The composite modified asphalt of the present embodiment is prepared according to the following steps:

[0055] (1) Slowly add SBS modifier after heating the 70# base asphalt to 160°C, and stir at a low speed with a stirrer, stir and swell for 30min after the addition of SBS, and keep the temperature within the range of 160°C;

[0056] (2) After rapidly heating the mixture of asphalt and SBS modifier to 170°C, use a high-speed shearing machine for processing, the rotational speed is 4500r / min, the time is 45min, and the temperature of the mixture during the shearing process is 170°C;

[005...

Embodiment 3

[0062] A high-viscosity modified asphalt based on SBS / polyurethane composite, in parts by mass, is composed of the following materials: 5 parts of polyurethane prepolymer H2133A, 4 parts of linear SBS modifier, 100 parts of 70# matrix asphalt, 0.6 part of chain agent M-OEA and 2 parts of coupling agent KH550, sulfur-free compound stabilizer is 1.0‰ of the mass of SBS modifier.

[0063] The composite modified asphalt of the present embodiment is prepared according to the following steps:

[0064] (1) Slowly add SBS modifier after heating 70# base asphalt to 165°C, and use agitator to stir at low speed, stir and swell for 30min after adding SBS, and keep the temperature within the range of 165°C;

[0065] (2) After rapidly heating the mixture of asphalt and SBS modifier to 175°C, use a high-speed shearing machine for processing, the rotational speed is 3500r / min, the time is 50min, and the temperature of the mixture during the shearing process is 175°C;

[0066] (3) Add stabili...

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Abstract

The invention discloses high-viscosity modified asphalt based on SBS / polyurethane compounding and a preparation method thereof. The preparation method includes: a) heating matrix asphalt to molten, adding a SBS modifier and uniformly mixing the components to make a mixture A, thus providing SBS-modified asphalt with incomplete swelling development; b) shearing the mixture A to obtain swelling-developed SBS-modified asphalt, adding a stabilizer to guarantee stability of a mixture B; c) adding a chain extender and a coupling agent, wherein the chain extender is a key factor of forming binding force after a curing reaction on a polyurethane prepolymer, and the coupling agent can reduce the chemical reactions between the polyurethane compound and micro amount of water in air, thus reducing theinfluence on storage stability and modification effect on the asphalt due to generated gas; d) finally, adding the polyurethane prepolymer, of which a molecular structure contains an active isocyanate group, which can react with a hydroxyl group, in the asphalt, to generate a carbamate group, therefore, a chemical reaction is carried out with amino groups in the matrix asphalt to generate allophanate.

Description

technical field [0001] The invention belongs to the field of road engineering materials, in particular to a high-viscosity modified asphalt based on SBS / polyurethane composite and a preparation method thereof. Background technique [0002] High-viscosity asphalt refers to a binder with a dynamic viscosity of more than 20,000 Pa s at a temperature of 60°. Adding it to the mixture can significantly improve its fatigue resistance; especially for drainage asphalt mixtures, studies have shown that the binder 60 °The dynamic viscosity value is the key to the durability of the drainage asphalt mixture. The porosity of the drainage asphalt mixture after compaction is more than 18%, and a drainage channel can be formed inside the mixture. The large void structure can quickly and effectively eliminate water on the road surface, improve driving safety in rainy days, and reduce traffic noise. It is an environmentally friendly road surface. Paved on urban roads, it can effectively redu...

Claims

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Application Information

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IPC IPC(8): C08L95/00C08L75/08C08L53/02
CPCC08L95/00C08L2205/03C08L2205/05C08L75/08C08L53/02
Inventor 罗要飞张争奇张苛谢祥兵胡照广杨建华张伟薛茹管巧艳何盛东
Owner ZHENGZHOU UNIVERSITY OF AERONAUTICS
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