Method for preapring poly3-hydroxy alkyl acid ester/carbondioride-propylene epoxide copolymer/starch terpolymer blend
A technology of hydroxyalkanoate and carbon dioxide is applied in the field of preparation of poly3-hydroxyalkanoate/carbon dioxide-propylene oxide copolymer/starch ternary blend, which can solve the problem of slow crystallization speed, performance change and high price. Expensive and other issues
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Embodiment 1
[0018] Get the number-average molecular weight of 40,000g / mole, 70 parts of PPC with a molecular weight distribution index of 3.0, 30 parts of PHBV, 1 part of starch, 5 parts of 1250 mesh talcum powder, 1 part of 1000 mesh boron nitride, four [β-(3,5- Di-tert-butyl-4-hydroxyphenyl) propionic acid] pentaerythritol (antioxidant ky-7910) 0.5 parts. Wherein the content of HV in PHBV is 17wt%. The above materials were stirred evenly in a high-speed mixer, extruded with a twin-screw extruder, granulated, and formed by hot pressing to obtain a sheet with a tensile yield strength of 20.3 MPa, a tensile modulus of 606 MPa, and an elongation at break of 59%, energy absorption 595mJ.
Embodiment 2
[0020] Get number-average molecular weight is 140,000g / mole, molecular weight distribution index is 5.0 PPC70 parts, PHBV30 parts, starch 30 parts, 1250 mesh talcum powder 5 parts, 1000 mesh boron nitride 1 part, four [beta-(3,5- Di-tert-butyl-4-hydroxyphenyl) propionic acid] pentaerythritol (antioxidant ky-7910) 0.5 part. Wherein the content of HV in PHBV is 0wt%, namely PHB. The above materials were stirred evenly in a high-speed mixer, extruded with a twin-screw extruder, granulated, and formed by hot pressing to obtain a sheet with a tensile yield strength of 31.0 MPa, a tensile modulus of 871 MPa, and an elongation at break of 14%, energy absorption 350mJ.
Embodiment 3
[0022] Get number-average molecular weight and be 96,000g / mole, molecular weight distribution index is 3.9 PPC 70 parts, PHBV30 parts, starch 50 parts, 1250 mesh talcum powder 5 parts, 1000 mesh boron nitride 1 part, four [beta-(3,5 - 0.5 parts of di-tert-butyl-4-hydroxyphenyl) propionic acid] pentaerythritol (antioxidant ky-7910). Wherein the content of HV in PHBV is 17wt%. The above materials were stirred evenly in a high-speed mixer, extruded with a twin-screw extruder, granulated, and formed by hot pressing to obtain a sheet with a tensile yield strength of 28.6 MPa, a tensile modulus of 751 MPa, and an elongation at break of 23%, energy absorption 280mJ.
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