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A kind of preparation method of polymer phase change material

A phase change material and polymer technology, applied in heat exchange materials, chemical instruments and methods, coatings, etc., can solve problems such as poor heat storage performance of copolymers, and achieve stable performance, good application prospects, and thermal stability. good effect

Inactive Publication Date: 2012-02-08
TIANJIN POLYTECHNIC UNIV
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  • 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 has no crystallinity, and the heat storage performance of the copolymer is poor

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  • A kind of preparation method of polymer phase change material
  • A kind of preparation method of polymer phase change material

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preparation example Construction

[0012] The preparation method (hereinafter referred to as the preparation method) of the polymer phase change material designed by the present invention, the preparation method adopts the following techniques:

[0013] Using 1 to 5 kinds of n-alkyl (meth)acrylates as raw materials, the general formula of the n-alkyl (meth)acrylates is CH 2 =C(CH 3 )-COOC n h 2n+1 or CH 2 =CH-COOC n h 2n+1 , where n=10-50, when there are 2-5 kinds of n-alkyl (meth)acrylates, the molar content of any one of the raw materials is not less than 10%, and all kinds of (meth)acrylic acid in the mixture The sum of the molar contents of n-alkyl esters is 100%, and the polymerization inhibitor is removed by washing with a conventional sodium hydroxide or potassium hydroxide solution with a mass percentage of 1 to 10%, and after vacuum distillation, one of the following methods is used Polymerization occurs:

[0014] (1) Irradiation-initiated polymerization: said irradiation-initiated refers to the...

Embodiment 1

[0038] Methyl methacrylate is mixed with 1-stearyl alcohol in a molar ratio of 1.1:1, and 0.5 wt% of methyl methacrylate weight (the same below) is added as a catalyst for p-toluenesulfonic acid, 0.1 wt% of polymerization inhibitor agent hydroquinone, reacted at 80°C for 4 hours, steamed out the generated methanol to obtain n-octadecyl methacrylate (OMA), which was washed with deionized water, 10% sodium hydroxide solution alkali and 10 After salt washing with 1% sodium chloride solution, wash again with deionized water to neutrality, dry with anhydrous calcium chloride for 8 hours, distill under reduced pressure, collect 80kPa, 70~100 ℃ fraction, and the yield is 89%.

[0039] with FeCl 2 4H 2 O is the catalyst, triphenylphosphine (PPh 3 ) is a complexing agent, n-ethyl 2-bromopropionate (EBP) is an initiator, toluene is used as a solvent, and the weight ratio of n-octadecyl methacrylate to toluene is 1: 1. / (EBP) / (FeCl 2 4H 2 O) / (PPh 3 ) when the ratio is 100 / 1 / 30 / 2, r...

Embodiment 2

[0047] Replace the 1-stearyl alcohol in Example 1 with 1-Cetyl Alcohol, and other reagents and process parameters are the same as in Example 1 to obtain poly-hexadecyl methacrylate with an endothermic temperature of 19.0° C. (Table 1) , melting enthalpy 50J / g, thermal decomposition temperature in air is 259 ℃.

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Abstract

The invention relates to a preparation method of a polymer phase change material. The preparation method adopts the following process: using 1 to 5 kinds of n-alkyl (meth)acrylates as raw materials, washing with conventional sodium hydroxide or potassium hydroxide solution with a mass percentage of 1 to 10% to remove polymerization inhibition After distillation under reduced pressure, the polymerization reaction takes place by one of the following methods: 1. Irradiation-induced polymerization; 2. Initiator-induced polymerization; 3. Polymerization in a solvent, which is polar or non-polar Polar organic solvent, the ratio of the n-alkyl (meth)acrylate to the solvent is 4:1~1:4; after the polymerization reaction, add precipitant methanol or ethanol to the reaction solution to make the polymer type phase change The material is precipitated from the solution, washed with deionized water, and dried to obtain the powdery polymer phase change material.

Description

technical field [0001] The invention relates to a preparation technology of a polymer phase change material, in particular to a preparation method of a polymer phase change material with functions of heat energy storage and utilization. Background technique [0002] Phase change material is an environmentally friendly and energy-saving material that was discovered in the 1960s and developed and applied after the 1970s. It is also a clean energy storage material. 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". According to their working phase state, phase change materials mainly include: solid-liquid phase change materials, such as n-alkanes, hydrated inorganic salts, etc.; solid-solid phase change materials, such as polyols. Among t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F20/18C08F2/48C08F2/06C08F120/18C08F220/18C09K5/06C09D133/08C09D133/10C09D5/00D01F6/16D01F6/36
Inventor 张兴祥石海峰王学晨牛建津
Owner TIANJIN POLYTECHNIC UNIV
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