High-sensitivity humidity sensing conductive rubber film and preparation method thereof
A technology of humidity sensing and conductive rubber, which is applied in the field of sensing materials to achieve good flexibility, low time-consuming and cost-effective, and simple preparation methods
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Embodiment 1
[0043] At room temperature, first dissolve 10 g of sodium carboxymethyl starch in 300 ml of water, add 5.8 g of sodium periodate, and modify its formylation. The amount of 8000-14000 Da) to remove small molecules in the solution. It was then freeze-dried and saved for future use. After 4 g of aldehyde-modified sodium carboxymethyl starch was dissolved in 120 ml of water, it was equally divided into two parts, wherein 0.2 g of polyvinylpyrrolidone was added to one part, and the other part was not added. Silver ammonia solution was added to the two aldylated sodium carboxymethyl starch solutions, the silver content accounted for 5 wt% of the rubber matrix, and reacted for 1 hour to form silver nanoparticles and silver nanosheets, respectively. Finally, the two mixed solutions were mixed with rubber latex and stirred for 0.5 hours. A highly sensitive humidity-sensing conductive rubber film prepared by rubber latex / natural polysaccharides is obtained after being dried by casting...
Embodiment 2
[0045] At room temperature, first dissolve 10 g of sodium carboxymethyl starch in 300 ml of water, add 5.8 g of sodium periodate, and modify its formylation. The amount of 8000-14000 Da) to remove small molecules in the solution. It was then freeze-dried and saved for future use. After 4 g of aldehyde-modified sodium carboxymethyl starch was dissolved in 120 ml of water, it was equally divided into two parts, wherein 0.2 g of polyvinylpyrrolidone was added to one part, and the other part was not added. Silver ammonia solution was added to the two aldylated sodium carboxymethyl starch solutions, the silver content accounted for 10 wt% of the rubber matrix, and reacted for 1 hour to form silver nanoparticles and silver nanosheets, respectively. Finally, the two mixed solutions were mixed with rubber latex and stirred for 0.5 hours. A highly sensitive humidity-sensing conductive rubber film prepared by rubber latex / natural polysaccharides is obtained after being dried by castin...
Embodiment 3
[0047] At room temperature, first dissolve 10 g of sodium carboxymethyl starch in 300 ml of water, add 5.8 g of sodium periodate, and modify its formylation. The amount of 8000-14000 Da) to remove small molecules in the solution. It was then freeze-dried and saved for future use. After 4 g of aldehyde-modified sodium carboxymethyl starch was dissolved in 120 ml of water, it was equally divided into two parts, wherein 0.2 g of polyvinylpyrrolidone was added to one part, and the other part was not added. Silver ammonia solution was added to the two aldylated sodium carboxymethyl starch solutions, the silver content accounted for 20 wt% of the rubber matrix, and reacted for 1 hour to form silver nanoparticles and silver nanosheets, respectively. Finally, the two mixed solutions were mixed with rubber latex and stirred for 0.5 hours. A highly sensitive humidity-sensing conductive rubber film prepared by rubber latex / natural polysaccharides is obtained after being dried by castin...
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