Preparation method of fumed silica and nanoscale carbon black composite material

Abstract

The invention discloses a preparation method of a fumed silica and nanoscale carbon black composite material. The prepared composite material can be used as a core material of a vacuum insulated panel. According to the composite material, with fumed silica as a main raw material, the compressive strength and the heat-insulating property of the product are improved by adding a short fiber, an opacifying agent and the like; the uniformly dispersed composite material is prepared by a mechanical high-speed mixing method; the effects on the heat-conducting property and the ageing effect of the composite material caused by the nanoscale carbon black as an additive are further researched; a plurality of groups of products are prepared by adjusting the adding amount of the nanoscale carbon black; a test shows that the composite material has the optimal heat-insulating property when the adding amount of the carbon black is 3%-15%, and the heat conductivity coefficient can reach 0.0040-0.0048w / mk. The composite material has the positive effects of being simple in preparation process, cheap and available in used raw materials and suitable for large-scale production, and is mixed by a dry method; the prepared product is excellent and stable in property and good in ageing property; and application energy consumption of household appliances such as refrigerators can be reduced.

Description

technical field [0001] The invention relates to the technical field of new thermal insulation materials, in particular to a method for preparing a fumed silica / nano carbon black composite material. Background technique [0002] With the development of human society and the advancement of science and technology, the consumption of energy has increased exponentially, and the development of new energy-saving materials and equipment is the focus of research in various countries. Vacuum insulation panels are plate-shaped materials made of high-barrier films, porous core materials, and adsorbents through vacuum forming processes. Due to their ultra-low thermal conductivity, they have attracted extensive attention. Among them, the core material as the core part is mainly composed of glass fiber, chopped strands, silica and other materials. Among them, the vacuum insulation panel with silica as the core material has a long service life and is environmentally friendly due to its low ...

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Problems solved by technology

[0005] M.Alam et al. (M.Alam, H.Singh, S.Brunner, C.Naziris.Energy and Buildings.69 (2014) 442-450) prepared expanded perlite / fumed silica composites and adjusted the expansion Perlite content is used to investigate the change of thermal conductivity of composite materials. The thermal conductivity of products prepared by this cost-saving method can reach a minimum of 0.0076w / mk. This method can reduce costs to a certain extent, but the thermal conductivity is high, which is not suitable for practical applications.

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