Patent ID: 11897162
Assignee: ZHEJIANG A & F UNIVERSITY
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 1:
2. The method for preparing a piezoresistive sensor material according to claim 1, wherein the first step further comprises:
adding the wood powder to an ionic liquid of 1-Ethyl-3-methylimidazolium acetate ([EMIM][Ac]) at an amount that is 4% to 6% of the mass fraction of the ionic liquid, and heating and stirring a resulting mixture at 110° C. to 185° C. for 30 min to 24 hours to form a suspension; transferring the above suspension into an acetone aqueous solution with a volume 8 to 10 times that of the suspension and a concentration of 40% to 60% (v/v), and stirring a resulting mixture for 1 hours to 3 hours, subjecting the mixture to suction filtration to obtain a filter cake, and washing the filter cake, and drying the filter cake at 100° C. to 110° C. to obtain a wood fiber;
adding the wood fiber to an aqueous solution comprising 4 wt NaOH and 4 wt % urea to form a suspension, freezing the suspension at −40° C. to −20° C. for 3 hours to 9 hours and thawing at room temperature, and repeating the freezing and thawing treatment 3 to 5 times to obtain a solated wood fiber, wherein the wood fiber and the aqueous solution are mixed at a mass ratio of (0.8-1.5):100;
adding epichlorohydrin (ECH) to the solated wood fiber at a mass 8 to 20 times that of the solated wood fiber, heating and reacting at 40° C. to 60° C. for 1 hours to 6 hours, and washing with water to obtain a chemical crosslinking-gelled wood fiber;
adding 100 mL to 500 mL of a 30% to 90% (v/v) ethanol aqueous solution to the chemical crosslinking-gelled wood fiber, standing for 10 h to 16 h, washing with water, and lyophilizing to obtain a wood fiber aerogel with a density of 0.016 g cm−3 to 0.025 g cm−3.