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A kind of asphalt anti-ultraviolet aging modifier, modified asphalt and preparation method thereof

A technology for anti-ultraviolet aging and modified asphalt, applied in building components, building insulation materials, construction, etc., can solve the problem of poor anti-ultraviolet aging performance and storage stability of asphalt pavement, easy physical migration and volatilization of light stabilizers, and asphalt pavement. Easy to UV aging and other problems, to achieve the effect of eliminating adverse effects, improving storage stability, and improving the ability to resist UV aging

Active Publication Date: 2022-03-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The UV absorber used in this method is prone to loss problems such as volatilization when mixed at high temperature, and the CeO 2 The compatibility between nanomaterials and asphalt is very poor, and segregation and stratification are prone to occur, which affects the performance of its anti-ultraviolet performance, and there is a limit to improving the anti-ultraviolet aging performance of asphalt mixture.
[0007] To sum up, the existing technology does not solve the problem of ordinary asphalt pavement prone to ultraviolet aging, but simply adds light stabilizers to asphalt, which has poor compatibility with asphalt, and light stabilizers are prone to physical migration and volatilization , resulting in poor anti-ultraviolet aging performance and storage stability of asphalt pavement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] (1) Add 3 parts by weight of hydrophilic anatase-type nano-titanium dioxide to 20 parts by weight of deionized water, and ultrasonically vibrate at 400W. Every 10s of ultrasonication, pause for 10s, and the total ultrasonication time is 40min.

[0054] (2) Under the condition of constant stirring, slowly add 0.05 parts by weight of dopamine hydrochloride to the mixed material obtained in step (1), and after continuing to stir for 30 minutes, add tris buffer solution to lower the pH of the mixed solution Adjust the value to 8.0. The mixture was kept stirring for 24 h in a constant temperature water bath at 25 °C.

[0055] (3) Filter the mixed material obtained in step (2), and dry at 70° C. for 4 hours to obtain preliminary modified nano-titanium dioxide.

[0056] (4) The preliminary modified nano-titanium dioxide obtained in step (3) and 2 parts by weight of Tinuvin770 are added to 50 parts by weight of ethanol. Keep the temperature at 70°C, keep stirring, heat to ref...

Embodiment 2

[0060] (1) Add 5 parts by weight of hydrophilic rutile nano-titanium dioxide to 30 parts by weight of deionized water, and oscillate ultrasonically at 450W. Every 15s of ultrasonication, pause for 15s, the total ultrasonication time is 50min.

[0061] (2) Under the condition of constant stirring, slowly add 0.12 parts by weight of dopamine hydrochloride buffer solution to the mixed material obtained in step (1), and continue stirring for 35 minutes, then add tris buffer solution to mix The pH of the solution was adjusted to 8.5. The mixture was kept stirring for 30 h in a constant temperature water bath at 30°C.

[0062] (3) Filter the mixed material obtained in step (2), and dry at 75° C. for 6 hours to obtain preliminary modified nano-titanium dioxide.

[0063] (4) Add the preliminary modified nano-titanium dioxide obtained in step (3) and 3 parts by weight of ADK Stab LA87 into 100 parts by weight of chloroform. Keep the temperature at 80°C, keep stirring, heat and reflux...

Embodiment 3

[0067] The other steps are the same as in Example 1, except that the base asphalt used in step (5) is changed to acid anhydrided pre-modified base asphalt, and finally modified asphalt A3 is prepared.

[0068] Among them, the anhydrided pre-modified base asphalt adopts the following preparation method: add 100 parts of base asphalt (same as Example 1) heated to 120°C into the reactor, add 4 parts of maleic anhydride, heat up to 130°C, wait Inject N after the pressure stabilizes 2 , keeping the total pressure at 0.25MPa, stirring and reacting at a constant temperature and pressure for 4 hours, and then slowly releasing the pressure to obtain an anhydrided pre-modified matrix asphalt.

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Abstract

The invention discloses an asphalt anti-ultraviolet aging modifier, modified asphalt and a preparation method thereof. The asphalt anti-ultraviolet aging modifier comprises the following raw material components in parts by weight: 2-10 parts of nano-titanium dioxide; 0.02-1.5 parts of dopamine hydrochloride; and 1-4 parts of hindered amine light stabilizer. The modified asphalt includes the above-mentioned modifier and base asphalt. In the invention, firstly, the dopamine hydrochloride and the hindered amine light stabilizer are respectively used to modify the nano-titanium dioxide to obtain the asphalt anti-ultraviolet aging modifier. The modifier is added into the melted base asphalt to finally obtain modified asphalt. The modified asphalt prepared by the asphalt anti-ultraviolet aging modifier of the invention has excellent anti-ultraviolet aging performance and storage stability.

Description

technical field [0001] The invention relates to a modifier, modified asphalt and a preparation method thereof, in particular to an asphalt anti-ultraviolet aging modifier for roads, modified asphalt and a preparation method thereof. Background technique [0002] The use of asphalt as a pavement material for expressways has many advantages, such as high strength, low resistance, no dust, low noise, and convenient maintenance and repair. It has always been valued by countries all over the world. Asphalt is basically used as a pavement when building high-grade highways Material. However, under ultraviolet radiation, asphalt will undergo a series of physical and chemical changes, resulting in hardening and brittleness, smaller failure strain, and easy cracking, which seriously affects the driving comfort of asphalt pavement and greatly shortens the service life of asphalt pavement. . [0003] At present, there are many solutions to the problem of anti-ultraviolet aging of asph...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L95/00C08K9/04C08K3/22C08K5/3435
CPCC08K9/04C08K3/22C08K5/3435C08K2201/011C08K2003/2241C08L2201/08C08L95/00
Inventor 刘成李志军刘树华郭皎河傅丽张建峰宁爱民程国香
Owner CHINA PETROLEUM & CHEM CORP
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