Preparation method of gutta-percha/modified rosin thermoplastic composite material
A technology for modifying rosin and composite materials, which is applied in the chemical modification of natural resins, etc., and can solve problems such as environmental hazards and difficult microbial degradation
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[0021] The invention provides a kind of preparation method of eucommia gum / modified rosin thermoplastic composite material, comprising the following steps:
[0022] Rosin, sodium ethylate and ethylene glycol are mixed for esterification to obtain 2-hydroxyethyl abietic acid;
[0023] The 2-hydroxyethyl abietic acid ester is mixed with L-(-) lactide, stannous octoate and chloroform, and the ring-opening polymerization is carried out to obtain 2-hydroxyethyl abietic acid grafted polylactide;
[0024] The 2-hydroxyethyl abietic acid grafted polylactide is mixed with eucommia gum and chloroform, and the chloroform in the obtained mixed solution is removed to obtain the eucommia gum / modified rosin thermoplastic composite material.
[0025] In the present invention, unless otherwise specified, the preparation materials used are commercially available products well known to those skilled in the art.
[0026] The invention mixes rosin, sodium ethylate and ethylene glycol for esterifi...
Embodiment 1
[0043] (1) Mix 1 g of gum rosin (the mass content of abietic acid is 95%), 0.05 g of sodium ethoxide and 10 mL of ethylene glycol, and reflux at 120° C. for 2 h;
[0044] (2) Cool to room temperature, add 10 mL of water and stir, then add 10 mL of chloroform for extraction, let stand, remove the lower layer of chloroform solution, repeat adding chloroform for extraction twice;
[0045] (3) The chloroform solution in the lower layer collected was combined, added anhydrous sodium sulfate and stirred for dehydration, and the dehydrated chloroform solution was concentrated to dryness under reduced pressure to obtain 2-hydroxyethyl abietic acid with a yield of 68.4%;
[0046] (4) Add 1 g of 2-hydroxyethyl abietic acid obtained in step (3), 0.5 g of L-(-) lactide, and 0.1 mL of stannous isooctanoate into 10 mL of chloroform, and reflux at 80° C. for 6 h;
[0047] (5) Cool to room temperature, add 5 mL of isopropanol and 10 mL of water and stir to remove unreacted L-(-) lactide and s...
Embodiment 2
[0051] (1) Mix 1 g of wood rosin (the mass content of abietic acid is 70%), 0.2 g of sodium ethoxide and 30 mL of ethylene glycol, and reflux at 140° C. for 6 h;
[0052] (2) Cool to room temperature, add 10 mL of water and stir, then add 30 mL of chloroform for extraction, let stand, remove the lower layer of chloroform solution, repeat adding chloroform for extraction twice;
[0053] (3) The chloroform solution in the lower layer collected was combined, anhydrous sodium sulfate was added to stir and dehydrate, and the dehydrated chloroform solution was concentrated to dryness under reduced pressure to obtain 2-hydroxyethyl abietic acid with a yield of 60.5%;
[0054] (4) 1 g of 2-hydroxyethyl abietic acid obtained in step (3), 1 g of L-(-) lactide, and 0.5 mL of stannous isooctanoate were added to 30 mL of chloroform, and refluxed at 100° C. for 12 h;
[0055] (5) Cool to room temperature, add 5 mL of isopropanol and 30 mL of water and stir to remove unreacted L-(-) lactide ...
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