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Preparation method and application of a shape-fixed phase change heat insulation and cooling pavement material suitable for high temperature areas

A technology of shape-setting phase change, heat insulation and cooling, applied in the field of building materials, can solve problems such as increasing cost, and achieve the effects of improving stability, wide phase change temperature range, and good heat storage.

Inactive Publication Date: 2019-11-01
NANCHANG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the existing solutions are "passive" measures such as the use of modified asphalt and the use of skeleton-type aggregate grading, which not only greatly increases the cost, but also cannot fundamentally solve the problem of high-temperature rutting on asphalt pavement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A preparation method of a shape-fixed phase-change heat-insulating and cooling pavement material suitable for high-temperature areas includes the following steps:

[0024] S1. Using TEOS as the precursor, a sol-gel process is used to prepare silica sol; specifically including the following steps:

[0025] S11. Mix ethyl orthosilicate and absolute ethanol at a temperature of 20-60°C and stir for 30-60 minutes to prepare solution A;

[0026] S12. Mix the absolute ethanol, deionized water, and concentrated hydrochloric acid to form B solution;

[0027] S13. Add solution B dropwise to solution A under vigorous stirring, continue to stir for 2-3 hours after the addition, and then seal and avoid light and age for 2-3 days to obtain silica sol.

[0028] S2. Take an appropriate amount of expanded perlite to modify it with an organic modifier, the stirring time is 2.5h, the modification temperature is 50-55℃, and the mass ratio of organic modifier / expanded perlite is 0.60 to obtain modifi...

Embodiment 2

[0034] A preparation method of a shape-fixed phase-change heat-insulating and cooling pavement material suitable for high-temperature areas includes the following steps:

[0035] S1. Using TEOS as the precursor, a sol-gel process is used to prepare silica sol; specifically including the following steps:

[0036] S11. Mix ethyl orthosilicate and absolute ethanol at a temperature of 20-60°C and stir for 30-60 minutes to prepare solution A;

[0037] S12. Mix the absolute ethanol, deionized water, and concentrated hydrochloric acid to form B solution;

[0038] S13. Add solution B dropwise to solution A under vigorous stirring, continue to stir for 2-3 hours after the addition, and then seal and avoid light and age for 2-3 days to obtain silica sol.

[0039] S2. Take an appropriate amount of expanded perlite to modify it with an organic modifier, the stirring time is 2.5h, the modification temperature is 50-55℃, and the mass ratio of organic modifier / expanded perlite is 0.60 to obtain modifi...

Embodiment 3

[0045] A preparation method of a shape-fixed phase-change heat-insulating and cooling pavement material suitable for high-temperature areas includes the following steps:

[0046] S1. Using TEOS as the precursor, a sol-gel process is used to prepare silica sol; specifically including the following steps:

[0047] S11. Mix ethyl orthosilicate and absolute ethanol at a temperature of 20-60°C and stir for 30-60 minutes to prepare solution A;

[0048] S12. Mix the absolute ethanol, deionized water, and concentrated hydrochloric acid to form B solution;

[0049] S13. Add solution B dropwise to solution A under vigorous stirring, continue to stir for 2-3 hours after the addition, and then seal and avoid light and age for 2-3 days to obtain silica sol.

[0050] S2. Take an appropriate amount of expanded perlite to modify it with an organic modifier, the stirring time is 2.5h, the modification temperature is 50-55℃, and the mass ratio of organic modifier / expanded perlite is 0.60 to obtain modifi...

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Abstract

The invention discloses a preparation method and an application of a shape-stabilized phase change heat insulation and cooling pavement material applicable to high-temperature regions. The method comprises steps as follows: silica sol is prepared with tetraethoxysilane as a precursor with a sol-gel technology; a proper amount of expanded perlite is modified with an organic modifier, and modified perlite is obtained; molten calcium chloride hexahydrate is subjected to emulsification dispersion under the ultrasonic condition under the emulsification dispersion effect of laurinol, and a stable emulsion is formed; modified perlite is added to silica sol and dispersed uniformly, an obtained mixed solution is placed in a vacuum oven, proper amounts of stearic acid, cellulose diacetate and the obtained emulsion are added, the obtained mixture is vacuumized, left to stand at the room temperature for 30 min and reacts at 70-80 DEG C under the normal pressure for 5 h, drying is performed at the normal temperature, and the pavement material is obtained. The obtained material is stable in structure, has better heat storage, cooling and heat insulation performance and has wide phase change temperature range, and the asphalt pavement rut problem in the high-temperature regions can be effectively solved.

Description

Technical field [0001] The invention relates to the field of building materials, in particular to a preparation method and application of a shape-fixed phase-change heat-insulating and cooling pavement material suitable for high-temperature areas. Background technique [0002] Asphalt pavement has been widely used due to its good smoothness, comfort, low noise, driving comfort, wear resistance, and easy maintenance. In my country's high-grade pavement, the share of asphalt pavement is as high as 90%. However, asphalt mixture is a viscoelastic material whose shear strength and cohesive force decrease significantly with increasing temperature. Summer in my country is generally high temperature, and asphalt easily reaches its softening point, leading to high-temperature instability and damage, among which rutting is the main form of damage. Most of the existing solutions are "passive" measures such as the use of modified asphalt and skeleton-type aggregate grading, which not only ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/24
CPCC04B28/24C04B2111/0075C04B14/185C04B24/085C04B24/383C04B22/124
Inventor 刘福明曹细春王瑜杨志平徐文光张立明
Owner NANCHANG INST OF TECH
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