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Method for preparing comb-shaped polymer solid-solid phase change material

A comb-shaped polymer and phase change material technology, applied in the field of phase change materials, can solve the problems of poor heat storage performance of copolymers, and achieve stable thermal performance, good degradation resistance, and good applicability

Active Publication Date: 2013-07-24
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

U.S. Patent (US20010018484) discloses a composition and preparation method of an oil-absorbing resin, which uses an alkyl acrylate copolymer as the main component, and the number of carbon atoms in the alkyl ester is 1 to 22. Since the number of carbon atoms is less than 8 The side chain of the alkyl acrylate is not crystalline, so the heat storage performance of the copolymer is poor

Method used

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  • Method for preparing comb-shaped polymer solid-solid phase change material
  • Method for preparing comb-shaped polymer solid-solid phase change material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] PVA (degree of polymerization 1780, degree of hydrolysis 98%) is placed in an oven and dried at 100°C for more than 6h until constant weight; 2 ), and then purified by distillation under reduced pressure to obtain dry DMF for subsequent use; mix and dissolve the dried 1-hexadecanol with DMF twice its mass, raise the temperature to 75°C, and add equimolar TDI at a speed of 5mL / min , stirred and mixed evenly, and reacted for 4 hours to obtain a prepolymer; the dried PVA was dissolved in DMF to form a 20% by mass PVA-DMF solution. Then dropwise add the prepared PVA-DMF solution at a speed of 10mL / min, control the molar ratio between the prepolymer and PVA to be 2500:1, add the catalyst DBTDL with 0.01% TDI quality, stir vigorously, and keep Reaction temperature 85 ℃, react 12h, until complete reaction, obtain the primary product of the copolymer of 1-hexadecanol grafted PVA, this product is in the form of gel; Use acetone to extract primary product 10h, remove excess prepo...

Embodiment 2

[0032] Adjust the mol ratio between prepolymer and PVA in embodiment 1 to be 1300: 1, all the other are identical with embodiment 1, the performance of the phase change material that obtains is listed in table 1.

[0033] Table 1 Phase change properties of phase change materials

[0034]

[0035] Note: G-weight gain ratio = (phase change material mass / PVA mass-1) x 100%; ΔH m - Enthalpy of fusion; ΔH c - Enthalpy of crystallization; T m - endothermic temperature; T c - exotherm temperature.

Embodiment 3

[0037] The molar ratio between the prepolymer and PVA in Example 1 was adjusted to 1000:1, and the rest were the same as in Example 1. The properties of the obtained phase change material are listed in Table 1.

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Abstract

The invention discloses a method for preparing a comb-shaped polymer solid-solid phase change material. The method comprises the following processes of: dissolving 1-3 kinds of 1-n-alkanols into 2-4-times of the 1-n-alkanols of solvent uniformly, adding one of diisocyanates with the same mole number as the 1-n-alkanols at the speed of 1-50mL / min, and reacting for 2-4 hours in a solvent of 30-90 DEG C under stirring to form a prepolymer solution; dissolving dried polyvinyl alcohol into the solvent, adding a dibutyltin dilaurate catalyst -assisted 0.01-1 percent of the mass of the polyvinyl alcohol, and adding the prepolymer solution at the speed of 5-50mL / min, wherein the molar ratio of the prepolymer to the polyvinyl alcohol is 1,000:1-2,500:1; and controlling the reaction temperature at a temperature 30-90 DEG C, reacting for 6-12 hours under stirring, then washing the obtained product, and drying the product to obtain the comb-shaped polymer solid-solid phase change material.

Description

technical field [0001] The invention relates to phase-change material technology, in particular to a method for preparing a comb-shaped polymer solid-solid phase-change material with thermal energy storage and release functions. Background technique [0002] During the phase change process, phase change materials can absorb or release a large amount of latent heat of phase change, and are widely used in HVAC, construction, solar energy utilization, clothing and other fields, and are of great significance in "energy saving and emission reduction". Solid-solid phase change materials are always in the solid state during the phase change process, with small volume changes and no liquid leakage, so they have important applications in many fields. [0003] Chinese invention patent (CN1616588A) discloses a polymer phase change material with two active end groups-polyethylene glycol and polyethylene glycol with one active end group fixed on the polymer framework material to form Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/65C08G18/30C08G18/62C08G18/60C08G18/64C09K5/02
Inventor 张兴祥石海峰李剑华李丽娟尹亿平
Owner TIANJIN POLYTECHNIC UNIV
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