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Solid-solid phase change material for active cooling of asphalt pavements, preparation method and application

A solid-solid phase change material and asphalt pavement technology, applied in the direction of heat exchange materials, chemical instruments and methods, can solve the problems of reducing the dispersion and compatibility of heat-conducting materials, poor thermal conductivity, and long preparation cycle, etc., to achieve improved Accurate perception and active cooling ability, improve dispersion and compatibility, and ensure the effect of phase change heat storage density

Inactive Publication Date: 2020-04-07
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, studies have shown that the thermal conductivity of polyurethane solid-solid phase change materials synthesized in the prior art is poor, which reduces the applicability of polyurethane solid-solid phase change materials in intelligent sensing and autonomous cooling of asphalt pavement temperature to a certain extent. Adding carbon-based materials to improve the thermal conductivity of polyurethane solid-solid phase change materials, but most of them are based on physical blending, which reduces the dispersion and compatibility of thermal conductive materials in phase change materials to a certain extent , and thus adversely affect the overall improvement of the thermal conductivity of phase change materials; at the same time, the preparation of existing solid-solid phase change materials adopts two-step bulk polymerization (synthesis of polyurethane prepolymer first, and then curing reaction) and solvent dissolution technology. The preparation process is complicated, the preparation cycle is long, and it is not suitable for large-scale mass production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Polyethylene glycol 4000, glycerol, diphenylmethane diisocyanate and graphene oxide are selected. Among the components, the molar ratio of [NCO] / [OH] is 1.2, wherein [OH] in glycerol: poly The molar ratio of [OH] in ethylene glycol is 0.1, and the mass fraction of graphene oxide is 0.7%. The specific preparation method is as follows:

[0035] Step 1. Under the protection of nitrogen, heat the polyethylene glycol 4000 to a completely molten state at 80°C;

[0036]Step 2, adding 0.31 g of glycerol and 0.77 g of graphene oxide in sequence to polyethylene glycol 4000 in a molten state, and stirring or ultrasonically dispersing until uniform, to obtain a physical blend system containing hydroxyl groups to be reacted;

[0037] Step 3: Add 9.05 g of diphenylmethane diisocyanate to the physical blending system containing hydroxyl groups to be reacted obtained in step 2, stir until uniform at 70° C., and react to obtain a finished product system;

[0038] Step 4. Pour the fini...

Embodiment 2

[0042] Polyethylene glycol 6000, glycerol, toluene diisocyanate and graphene oxide are selected. Among the components, the molar ratio of [NCO] / [OH] is 1.2, wherein [OH] in glycerol: polyethylene glycol The molar ratio of [OH] is 0.5, and the mass fraction of graphene oxide is 1.5%. The specific preparation method is as follows:

[0043] Step 1. Under the protection of nitrogen, heat polyethylene glycol 6000 to a completely molten state at 85°C;

[0044] Step 2, adding 1.03 g of glycerol and 1.60 g of graphene oxide in sequence to polyethylene glycol 6000 in a molten state, and stirring or ultrasonically dispersing until uniform, to obtain a physical blend system containing hydroxyl groups to be reacted;

[0045] Step 3. Add 5.23 g of toluene diisocyanate to the physical blending system obtained in step 2 containing hydroxyl groups to be reacted, stir at 90° C. until uniform, and react to obtain a finished product system;

[0046] Step 4. Pour the finished product system obt...

Embodiment 3

[0050] Polyethylene glycol 4000, glycerol, hexamethyl diisocyanate and graphene oxide are selected. Among the components, the molar ratio of [NCO] / [OH] is 1.1, wherein [OH] in glycerol: polyethylene glycol The molar ratio of [OH] in the diol is 0.2, and the mass fraction of graphene oxide is 0.25%. The specific preparation method is as follows:

[0051] Step 1. Under the protection of nitrogen, heat polyethylene glycol 4000 to a completely molten state at 75°C;

[0052] Step 2, adding 0.307 g of glycerol and 0.27 g of graphene oxide to polyethylene glycol 4000 in a molten state, and stirring or ultrasonically dispersing until uniform, to obtain a physical blend system containing hydroxyl groups to be reacted;

[0053] Step 3: Add 5.56 g of hexamethyl diisocyanate to the physical blending system containing hydroxyl groups to be reacted obtained in Step 2, stir at 75°C until uniform, and react to obtain a finished product system;

[0054] Step 4. Pour the finished product syst...

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PUM

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Abstract

The invention discloses a solid-solid phase change material for asphalt pavement active cooling, a preparation method and application, the solid-solid phase change material comprises the following components: polyethylene glycol, a cross-linking agent, an isocyanate and graphene oxide; the mass of graphene oxide accounts for 0.25%-5% of the total mass of polyethylene glycol, the cross-linking agent and the isocyanate; in the polyethylene glycol, the cross-linking agent and the isocyanate, the molar ratio of [NCO] to [OH] is 1.1-1.3, and the molar ratio of [OH] in the cross-linking agent to [OH] in polyethylene glycol is 0.1-0.5. According to the present invention, with the determination of the formula, [OH] in graphene oxide can chemically react with [NCO] in the isocyanate so as to introduce graphene oxide into the polyurethane solid-solid phase change material in situ, such that the dispersibility and the compatibility of graphene oxide in the phase change material are improved; theheat conduction capability is remarkably improved while the phase-change heat storage density is guaranteed, and the accurate sensing and active cooling capability of the phase-change material on thetemperature of asphalt pavements are improved.

Description

technical field [0001] The invention belongs to the technical field of intelligent asphalt pavement materials, and in particular relates to a solid-solid phase change material for active cooling of asphalt pavement, a preparation method and an application. Background technique [0002] With the people's yearning for a better life and the increasing requirements for safe, convenient and comfortable travel, intelligent road infrastructure with the goal of future intelligent transportation is the technical direction of the development of the contemporary transportation field. Among them, self-sensing technology, as an important part of intelligent road infrastructure, requires the road body to be able to perceive physical quantities such as external light, heat, and loads, and realize active adjustment of road surface functions and states. [0003] Traditional phase change materials exhibit solid-liquid transition characteristics during the phase change process, which determine...

Claims

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Application Information

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IPC IPC(8): C08G18/76C08G18/73C08G18/75C08G18/66C08G18/48C08G18/32C08K3/04C09K5/02
CPCC08G18/3206C08G18/4833C08G18/6677C08G18/73C08G18/755C08G18/7614C08G18/7671C09K5/02C08K3/042
Inventor 沙爱民贾猛蒋玮刘状壮王文通袁东东李建阁焦文秀
Owner CHANGAN UNIV