Process for preparing organic montmorillonite / mineral wax composite energy-storage material

Abstract

The invention provides a process for preparing organic montmorillonite / mineral wax composite energy-storage material, which consists of, preparing alcoholic solution with 15-25% of mass concentration from silicane coupling agent 0.04-0.06 mass times of organic montmorillonite, at room temperature, treating organic montmorillonite 20-30 minutes with the solution in sealed container, stirring and dispersing the treated organic montmorillonite in aqueous solution of 20-25% of ethanol, elevating the temperature to 60-80 deg. C, charging molten paraffin wax with a fusion point lower than 60 deg. C 1.5-2 times of the mass of organic montmorillonite, stirring 4-6 hrs and filtering, washing with 30-60 deg. C, 20-40% of ethanol aqueous solution till the emerge of paraffinum liquidum droplets, drying the washed product at 90-120 deg C to constant weight.

Description

technical field [0001] The invention relates to a method for preparing an organic montmorillonite / paraffin composite energy storage material by modifying the surface and edge of an organic montmorillonite with a silane coupling agent, and belongs to the technical field of preparation and application of energy storage materials. Background technique [0002] Phase change energy storage materials are an environmentally friendly and energy-saving technology that has developed rapidly in recent years. It is widely used in HVAC buildings and is of great significance. The solid-solid phase change material always maintains a fixed shape during the heat storage and release process, while the solid-liquid phase change material is accompanied by a solid-liquid transition during the heat storage and release process, so special packaging equipment must be provided, but due to the optional solid - There are few types of solid phase change materials and the price is high. Therefore, altho...

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Problems solved by technology

However, this method is not only complicated in process, but also only interlayer modification of inorganic soil, without special modification of its surface and edges, so its surface polarity is not significantly reduced, and it cannot effectively increase the compatibility of inorganic soil and organic materials. properties, the obtained composite material not only has an unsatisfactory appearance, but also the latent heat of phase change is not large enough due to the limitation of the amount of intercalation

In addition, the organic phase change materials in the composite materials prepared by the above method are all pure compounds, such as n-hexadecane, n-octadecane, n-butyl stearate, erucic acid, capric acid and their mixtures, which are expensive

Paraffin wax is a mixture of various alkanes, with stable chemical and thermal properties, wide sources, and low price. However, because of its lower heat storage value than pure alkanes, it is poor in compatibility with inorganic soils in the preparation of intercalation composite materials. The small amount of intercalation leads to a large reduction in the heat storage value of the composite materials that can be prepared, which limits its widespread use

[0004] The purpose of the present invention is to solve the problems of high price, complex process, low heat storage value and unsatisfactory material appearance in the heat storage and discharge process of the above-mentioned composite materials. , taking the organic montmorillonite that has been produced and sold on the market on a large scale as the intercalation material, researched and invented a preparation method of organic montmorillonite / paraffin composite phase change material, the preparation process is simplified, and the prepared composite material has high storage capacity Calorific value, good heat transfer, and good appearance in the process of heat storage and discharge

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