A kind of transparent elastic polylactic acid copolymer and preparation method thereof
A polylactic acid copolymer, transparent and elastic technology, applied in the field of transparent elastic polylactic acid copolymer, can solve the problems of lack of elastomer in polylactic acid materials, and achieve the effect of enriching varieties and broadening the scope of application
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[0025] Another aspect of the present invention provides a kind of preparation method of transparent elastic polylactic acid copolymer, the method comprises the following steps:
[0026] (1) Under the conditions of ring-opening random copolymerization, under an inert atmosphere, contact and react lactide, caprolactone and a ring-opening polymerization catalyst to obtain a mixture containing polycaprolactone-polylactic acid random copolymer;
[0027] (2) Under block copolymerization conditions, under an inert atmosphere, the mixture obtained in step (1) is reacted with lactide.
[0028] According to the method of the present invention, wherein, in order to obtain a transparent polylactic acid copolymer with good elastic properties, random copolymerization is mainly carried out through ring opening of lactide and caprolactone, and the product is further block-copolymerized with polylactic acid Polymerization, so as to achieve the purpose of the invention, therefore, in step (1), ...
Embodiment 1
[0052] Add 30gL-lactide and 20gε-caprolactone into the reactor respectively, mix uniformly and keep the vacuum at 50°C for 1 hour, so that the mixture in the reactor becomes homogeneous, and then pour into the reactor under nitrogen atmosphere Add 50 mg of stannous octoate, place the reactor in an oil bath at 150° C., and react for 3 hours to obtain the pre-product a1, whose weight-average molecular weight is shown in Table 1. Open the reactor, add 50g of L-lactide under a nitrogen atmosphere, continue to heat up to 170°C, and react for another 3 hours. After cooling the reactor, add chloroform to dissolve it, and then precipitate it in anhydrous methanol. The product was dried to obtain transparent elastic polylactic acid copolymer A1, and its weight-average molecular weight and molecular weight distribution index are shown in Table 1. After making the transparent elastic polylactic acid copolymer A1 into a 15cm×15cm×2mm sample plate, the tensile strength, elongation at break...
Embodiment 2
[0054] Add 30gL-lactide and 20gε-caprolactone into the reactor respectively, mix uniformly and keep the vacuum at 50°C for 1 hour, so that the mixture in the reactor becomes homogeneous, and then pour into the reactor under nitrogen atmosphere Add 50 mg of stannous octoate, place the reactor in an oil bath at 150° C., and react for 6 hours to obtain the pre-product a2, whose weight-average molecular weight is shown in Table 1. Open the reactor, add 50g of L-lactide under a nitrogen atmosphere, continue to heat up to 170°C, and react for another 6 hours. After cooling the reactor, add chloroform to dissolve it, and then precipitate it in anhydrous methanol. The product is dried to obtain transparent elastic polylactic acid copolymer A2, and its weight average molecular weight and molecular weight distribution index are as shown in Table 1. After making the transparent elastic polylactic acid copolymer A2 into a 15cm×15cm×2mm sample plate, the tensile strength, elongation at bre...
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