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Magnesium-aluminum-base laminar dihydroxide anti-aging elastomer modified asphalt coating material and preparation method thereof

A double hydroxide, anti-aging technology, applied in asphalt coatings, coatings, etc., can solve the problems of limited anti-aging ability of asphalt, low temperature flexibility, hardened and brittle modified asphalt, etc., to improve UV aging resistance performance, excellent aging resistance, and the effect of improving the ability to resist ultraviolet rays

Inactive Publication Date: 2011-09-21
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, both SBS and asphalt are organic polymer materials, which are very susceptible to photo-oxidative aging due to ultraviolet radiation, which makes the modified asphalt hard and brittle, and the low-temperature flexibility is significantly reduced. It is difficult to adapt to the cold shrinkage of the roof base at low temperature in winter Cracks occur, which leads to damage to the waterproof layer, resulting in roof leakage
An effective way to improve the anti-aging performance of polymers is to add anti-aging agents. However, the research results show that anti-aging agents have limited ability to improve the anti-aging effect of asphalt, and some even accelerate the aging of asphalt.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 6 parts (parts by mass, the same below) of star-shaped styrene-butadiene-styrene block thermoplastic elastomer (SBS) to 59.9 parts of asphalt that has been heated to 175°C (softening point 46.5°C, penetration 95dmm ), keep the temperature at 170-180°C, stir on a high-shear mixer at a speed of 4000rpm for 1h, add 2 parts of magnesium-aluminum-based layered double hydroxide (composed of Mg 0.75 al 0.25 (OH) 2 (CO 3 ) 0.12 1.2H 2 O, surface modified by sodium lignosulfonate, the particle size in the a and b directions is 0.4 μm, and the grain thickness in the c-axis direction is 0.1 μm), the temperature is maintained at 170-180 ° C, at the speed of 4000 rpm Stir the reaction for 0.5h, then add 0.1 part of maleic anhydride, keep the temperature at 170-180°C, stir and react at the speed of 4000rpm for 0.5 hour, finally add 32 parts of talcum powder (particle size is 200 mesh), the stirring speed Adjust the temperature to 3000rpm, the temperature is 170-180°C, and st...

Embodiment 2

[0026] Add 6 parts of star-shaped styrene-butadiene-styrene block thermoplastic elastomer (SBS) to 59.8 parts of asphalt (softening point 46.5°C, penetration 95dmm) that has been heated to 175°C, and keep the temperature at 170°C ~180°C, stir for 1.5h at a speed of 5000rpm on a high-shear mixer, add 3.5 parts of magnesium-aluminum-based double hydroxide, keep the temperature at 170-180°C, stir and react at a speed of 5000rpm for 0.5h, then add 0.2 parts of maleic anhydride, keep the temperature at 160~170°C, stir and react at 5000rpm for 0.5 hours, finally add 30.5 parts of talcum powder (particle size is 150 mesh), adjust the stirring speed to 3000rpm, keep the temperature at Stir at 170-180°C for 1 hour to obtain a magnesium-aluminum-based layered double hydroxide aging-resistant elastomer-modified asphalt coating material for waterproof membranes.

[0027] In the ultraviolet aging test box, the ultraviolet aging test was carried out on the magnesium-aluminum-based layered d...

Embodiment 3

[0029] Add 3.0 parts of star-shaped styrene-butadiene-styrene block thermoplastic elastomer (SBS) and 3.0 parts of linear styrene-butadiene-styrene block thermoplastic elastomer to 59.7 parts and heat up to 170°C In asphalt (softening point 46.5°C, penetration 95dmm), keep the temperature at 170-180°C, stir for 2 hours at a speed of 5000rpm on a high-shear mixer, add 4.6 parts of magnesium-aluminum-based double hydroxide, and keep the temperature 170-180°C, stirred and reacted at a speed of 4000rpm for 1h, then added 0.3 parts of maleic anhydride, kept the temperature at 170-180°C, stirred and reacted at a speed of 4000rpm for 0.5 hours, and finally added 29.4 parts of talc powder ( The particle size is 100 mesh), adjust the stirring speed to 2000rpm, keep the temperature at 170-180°C, and stir for 2 hours to obtain a magnesium-aluminum-based layered double hydroxide aging-resistant elastomer modified asphalt coating.

[0030] In the ultraviolet aging test box, the ultraviolet...

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Abstract

The invention relates to an anti-aging elastomer modified asphalt coating material for a waterproof coiled material and a preparation method thereof. The magnesium-aluminum-base laminar dihydroxide anti-aging elastomer modified asphalt coating material is characterized by comprising the following raw materials in percentage by mass: 50.5-67.9% of asphalt, 6-8% of SBS (styrene-butadiene-styrene) modifier, 1-6% of magnesium-aluminum-base laminar dihydroxide, 0.1-0.5% of stabilizer and 25-35% of filler. Since the magnesium-aluminum-base laminar dihydroxide is added into the asphalt, the ultraviolet resistance of the elastomer modified asphalt is improved by the physical shielding and chemical absorption actions on the ultraviolet, thereby obviously enhancing the ultraviolet aging resistance of the waterproof coiled material.

Description

technical field [0001] The invention relates to an aging-resistant elastomer modified asphalt coating material for waterproof coiled materials and a preparation method thereof Background technique [0002] Asphalt is an important building waterproof material, which is widely used because of its excellent waterproof performance and low price. Polymer modified bitumen waterproofing membrane is the most widely used building waterproofing material, especially SBS modified bitumen waterproofing membrane is very popular because of its good high and low temperature performance. However, both SBS and asphalt are organic polymer materials, which are very susceptible to photo-oxidative aging due to ultraviolet radiation, which makes the modified asphalt hard and brittle, and the low-temperature flexibility is significantly reduced. It is difficult to adapt to the cold shrinkage of the roof base at low temperature in winter Cracking occurs, which leads to damage to the waterproof laye...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D195/00C09D153/02C09D7/12
Inventor 余剑英张恒龙吴少鹏庞凌陈美祝况栋梁李志超
Owner WUHAN UNIV OF TECH
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