Nanocapsule-based thermal insulation functional masterbatch and preparation method thereof

A nanocapsule, wherein the nanocapsule is a nanoscale thermal insulation material formed by organically compounding a nanoscale tungsten-doped oxide and an alcohol-acid composite crystal;

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• a preparation method of the nanocapsule comprises the following steps:
• (1) according to parts by mass, dissolving 0.5 parts to 1 part of sodium dodecyl sulfate (SDS) in 50 parts to 80 parts of deionized water to obtain a solution A;
• mixing 5 parts to 8 parts of methyl methacrylate (MMA), 1 part to 2 parts of ethyl acrylate (EA), 8 parts to 15 parts of the alcohol-acid composite crystal, and 0.1 parts to 0.2 parts of azobisisobutyronitrile (AIBN) ultrasonically for 5 min to 10 min to obtain a solution B;
• adding the solution B dropwise into the solution A, and then stirring at 20° C. to 40° C. for 5 min to 30 min to obtain an emulsion C;
• and stirring the emulsion C to allow a reaction at 75° C. to 85° C. for 0.5 h to 1.5 h;
• (2) dissolving 1 part to 2 parts of the SDS and 1 part to 5 parts of hydroxyethyl methacrylate (HEMA) in 120 parts to 150 parts of the deionized water to obtain a solution D;
• mixing 7 parts to 10 parts of the MMA, 2 parts to 3 parts of pentaerythritol tetraacrylate (PETTA), and 0.1 parts to 0.3 parts of the AIBN ultrasonically to allow dispersion for 5 min to 15 min to obtain a solution E;
• adding the solution E dropwise into the solution D, and then stirring at 20° C. to 40° C. for 5 min to 30 min to obtain an emulsion F;
• and adding the emulsion F into the emulsion C, and then conducting a reaction at 75° C. to 85° C. for 5 h to 10 h to obtain a polymer solution;
• (3) dispersing 5 parts to 10 parts of the nanoscale tungsten-doped oxide and 0.1 parts to 0.5 parts of polyvinylpyrrolidone (PVP) in 50 parts to 100 parts of the deionized water, adjusting an obtained solution to a pH value of 5.5 to 6.5 with hydrochloric acid, conducting an ultrasonic treatment for 0.5 h to 1 h, and then conducting washing, filtering, and drying;
• mixing an obtained dried material and 1 part to 2 parts of the SDS in 30 parts to 50 parts of the deionized water, and then conducting an ultrasonic treatment for 10 min to 30 min to obtain a dispersion G;
• and adding the dispersion G dropwise into the polymer solution obtained in step (2), and then stirring until a uniform liquid phase is formed;
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• (4) adding 2 parts to 5 parts of a silane emulsion into the uniform liquid phase obtained in step (3), stirring to allow a reaction at 40° C. to 50° C. for 1 h to 2 h, and then subjecting an obtained reaction solution to suction filtration, repeated washing, and vacuum drying for 24 h to 48 h to obtain the nanocapsule.