A functionalized assembly of magnesium-aluminum-based layered double hydroxyl metal hydroxide modifier and its preparation method and application

A double hydroxyl metal and hydroxide technology, which is applied in the direction of building structure, building components, building insulation materials, etc., can solve the problem that the anti-ultraviolet aging ability of LDHs cannot be fully exerted, the improvement effect of anti-thermal oxygen aging and the long-term weakening , Asphalt can not be uniformly dispersed, etc., to achieve the effect of enhancing thermal oxygen and ultraviolet aging resistance, enhancing thermal oxygen aging resistance, and improving compatibility and stability

Active Publication Date: 2022-06-24
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the surface of LDHs laminates contains a large number of polar groups, they are prone to agglomeration, which leads to their inability to disperse uniformly in asphalt, thus limiting the ability of LDHs to fully exert their UV aging resistance.
On the other hand, although LDHs have good anti-ultraviolet aging ability, their performance in anti-thermal-oxidative aging is mediocre.
Patent CN103526891B discloses a method for simultaneously enhancing the anti-ultraviolet aging and thermal oxygen aging resistance of materials by compounding LDHs and antioxidants. The oxygen agent will continue to migrate from the asphalt matrix to the surface, resulting in a significant weakening of its thermal and oxidative aging resistance improvement effect and long-term performance

Method used

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  • A functionalized assembly of magnesium-aluminum-based layered double hydroxyl metal hydroxide modifier and its preparation method and application
  • A functionalized assembly of magnesium-aluminum-based layered double hydroxyl metal hydroxide modifier and its preparation method and application
  • A functionalized assembly of magnesium-aluminum-based layered double hydroxyl metal hydroxide modifier and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The functionalized assembled LDHs required in Example 1 can be prepared according to the method steps of the functionalized assembled LDHs modifier, wherein the active ingredient of the anionic antioxidant is selected from sulfurized diphenylamine, and the surface modifier is methacryloyl Oxyundecylmethyldiethoxysilane, the mass parts of each raw material are as follows: 85 parts of LDHs, 12 parts of diphenylamine sulfur, 3 parts of methacryloxyundecylmethyldiethoxysilane .

[0028] Select 95 parts of road petroleum asphalt (penetration of 65 dmm at 25°C, softening point of 45°C, ductility of 22 cm at 10°C) and heat it to a flowing state. At 5000 rpm, 5 parts of the prepared functionalized assembly LDHs modifier were slowly added for 90 min to melt blend, and the modified asphalt with excellent thermal-oxidative aging resistance, UV aging resistance and comprehensive performance could be obtained.

Embodiment 2

[0037] The functionalized assembled LDHs required in Example 2 can be prepared according to the method steps of the functionalized assembled LDHs modifier, wherein the active ingredient of the anionic antioxidant is diphenylamine sulfide, and the surface modifier is hexadecyl Trimethoxysilane, the parts by mass of each raw material are as follows: 60 parts of LDHs, 35 parts of diphenylamine sulfide, and 5 parts of hexadecyltrimethoxysilane.

[0038] Select 91 parts of road petroleum asphalt (penetration of 65 dmm at 25°C, softening point of 45°C, ductility of 22 cm at 10°C) and heat it to a flowing state. At 5000 rpm, 9 parts of the prepared functionalized assembly LDHs modifier were slowly added and melt blended for 90 min to obtain a modified asphalt with excellent thermo-oxidative aging resistance, UV aging resistance and comprehensive performance.

Embodiment 3

[0047] The functionalized assembled LDHs required in Example 3 can be prepared according to the method steps of the functionalized assembled LDHs modifier, wherein the active ingredient of the anionic antioxidant is diphenylamine sulphide, and the surface modifier is octadecyl Trimethoxysilane, the parts by mass of each raw material are as follows: 70 parts of LDHs, 15 parts of diphenylamine sulfide, and 15 parts of octadecyltrimethoxysilane.

[0048] Select 85 parts of road petroleum asphalt (penetration of 65 dmm at 25°C, softening point of 45°C, ductility of 22 cm at 10°C) and heat it to a flowing state. Under the condition of 5000 rpm, 15 parts of the prepared functionalized assembly LDHs modifier were slowly added and melt blended for 90 min, and the modified asphalt with excellent thermal-oxidative aging resistance, UV aging resistance and comprehensive performance could be obtained.

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Abstract

The invention discloses a functionalized assembly magnesium-aluminum-based layered double hydroxyl metal hydroxide modifier and a preparation method thereof. The modifier uses an anionic antioxidant active ingredient to modify LDHs intercalation and surface modification It is prepared by organically modifying and co-functionalizing the assembly of agents. The present invention enhances its anti-thermal and oxidative aging ability by intercalating the active ingredients of anionic antioxidants into the interlayer of LDHs, and at the same time utilizes the laminate structure of LDHs to prevent anti- The oxygen agent migrates to the surface in the asphalt to improve the long-term effect of the antioxidant; by grafting the surface modifier of the long-chain branched organic functional group to the surface of the LDHs, the polar groups on the surface of the LDHs are reduced by the chemical interaction between the two. Inhibit the inter-particle agglomeration of LDHs and improve the dispersion of LDHs in asphalt. At the same time, the introduction of long-chain branched organic functional groups can enhance the lipophilicity of LDHs, enhance the compatibility and stability with asphalt, and significantly improve the thermal oxygen and UV aging resistance of asphalt. ability.

Description

technical field [0001] The invention belongs to the technical field of asphalt modification, and in particular relates to a functionalized assembly of magnesium-aluminum-based layered double hydroxyl metal hydroxide (LDHs) modifier and its preparation method and application. Background technique [0002] Asphalt pavement has the advantages of comfortable driving, low noise, easy maintenance and high safety, making it widely used in road construction. Asphalt materials are prone to aging under the influence of external environmental factors (such as heat, ultraviolet light, oxygen, etc.). The aging of asphalt materials leads to rutting, potholes and cracks on the asphalt pavement, which seriously affects the service life of the asphalt pavement. Asphalt aging is mainly divided into thermo-oxidative aging and ultraviolet aging, both of which can lead to cracking of asphalt material properties, and these two types of aging show obvious coupling effects. The anti-aging technolo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L95/00C08K9/06C08K9/04C08K7/00
CPCC08K9/06C08K9/04C08K7/00C08L2201/08C08L95/00
Inventor 章灿林汪婷胡昌斌徐松方雷何俊
Owner FUZHOU UNIV
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