Hydrophobic modifier and method for preparing airgel thermal insulation blanket with hydrophobic modifier

Abstract

The invention relates to a hydrophobic modifying agent, which comprises castor oil and oleamide according to a weight ratio of (6.8 to 7.5): (2.5 to 3.2). The material replaces a conventional silane coupling agent to be used as the hydrophobic modifying agent of the aerogel heat insulation felt. The use of dangerous chemicals and the pollution discharge are reduced, so that the production of the aerogel heat insulation felt achieves better environment-friendly effects, and is safe and economical. The method for preparing the aerogel heat insulation felt from the hydrophobic modifying agent comprises the steps of aerogel ahead fluid preparation, aerogel composite heat insulation felt forming, solvent replacement, modification, aging and drying. The preparation raw materials and the process are optimized; the raw material selection is safer and achieves a better environment-friendly effect; the operation process is simpler; the production period is greatly shortened; the production cost is greatly reduced; the heat insulation performance of the prepared aerogel heat insulation felt is further improved; the highest use temperature reaches 757 DEG C; the combustion grade reaches the grade A1; the heat conduction coefficient is lower than 7.715w / m.k.

Description

technical field [0001] The invention belongs to the technical field of thermal insulation materials, and relates to a hydrophobic modifier and a method for preparing an airgel thermal insulation blanket by using the hydrophobic modifier. Background technique [0002] At present, the modified raw materials used in the production of airgel insulation blankets are basically silane coupling agents, mainly trimethylchlorosilane, hexamethyldisilazane, 3-aminopropyltriethoxysilane and hexamethylsilane Such chemical substances are flammable and toxic to humans, and their emissions are restricted according to national environmental protection standards. This not only pollutes the environment, but also restricts the manufacture and development of airgel thermal insulation blankets, improving product quality. Due to cost and price, airgel thermal insulation blankets cannot be widely used so far. Contents of the invention [0003] According to the above problems, an object of the pre...