A kind of bio-based high-damping cyclized Eucommia gum and its preparation method and application
A technology of eucommia gum and cyclization reaction, applied in the rubber field, can solve the problems of less research on the functionalized damping properties of eucommia gum, and achieve the effects of improving environmental pollution, good thermal stability and mild reaction.
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Embodiment 1
[0037] This embodiment provides a preparation method of cyclized Eucommia gum elastomer, comprising:
[0038] Dissolve Eucommia gum in the organic solvent cyclohexane to make a solution with a concentration of 3%, add catalyst ferric chloride, the amount of catalyst is 10% of the amount of Eucommia gum, and react at 60°C for 40 minutes;
[0039] Then adding organic solvent ethanol to the obtained reaction solution, precipitating, washing, and finally drying in a low-temperature vacuum oven to constant weight to prepare the cyclized Eucommia gum elastomer material.
[0040] Its NMR spectrum is as figure 1 As shown, the new peak at 0.8~1.0ppm is the characteristic peak of the methyl group connected with saturated carbon, and the new peak at 5.31ppm is the characteristic peak of the double bond of the six-membered ring structure similar to cyclohexene. It proves that Eucommia gum has been successfully cyclized and modified.
[0041] After testing, the degree of cyclization of t...
Embodiment 2
[0043] This embodiment provides a preparation method of cyclized Eucommia gum elastomer, comprising:
[0044]Dissolve Eucommia gum in petroleum ether, an organic solvent, to make a solution with a concentration of 2%, add catalyst p-benzenesulfonic acid, the amount of catalyst is 5% of the amount of Eucommia gum, and react at 50°C for 80 minutes;
[0045] Then, the organic solvent acetone precipitates, washes, and finally dries in a low-temperature vacuum oven to constant weight to obtain the cyclized Eucommia gum elastomer material.
[0046] After testing, the obtained cyclized Eucommia gum elastomer has a cyclization degree of 14.3%, a loss factor of 1.02, a Shore hardness of 40, and a glass transition temperature of -56°C.
Embodiment 3
[0048] The preparation method is the same as in Example 2, except that the reaction is performed at 50° C. for 40 minutes.
[0049] After testing, the cyclization degree of the obtained cyclized Eucommia gum is 5.1%, the loss factor is 0.21, the Shore hardness is 77, and the glass transition temperature is -61°C.
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Abstract
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