Polylactic acid and electron beam radiation modified method for derivative of the same
A technology of electron beam radiation and polylactic acid, which is applied in the field of modification of polylactic acid and its derivatives, to achieve the effects of expanding the application field, shortening the preparation cycle, and expanding the scope of the system
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[0059] Example 1
[0060] The polylactic acid (polylactic acid 1) was heated to 180°C for 3 minutes, then cooled to room temperature, and then cold-pressed at room temperature to form a sheet or film. When it reaches 1 mg / L, start the electron beam equipment, send the polylactic acid sheet or film into the irradiation chamber of the electron beam equipment, and close the irradiation chamber; irradiate with electron beam at room temperature (25°C), and the radiation dose is 55kGy. The softening temperature of the obtained modified polylactic acid was 70° C., the tensile strength was 5.0 MPa, the elongation at break was 20.9%, and the biodegradation rate in 140 hours was 96%.
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[0061] Example 2
[0062] Acrylic-terminated polylactic acid (polylactic acid 2, R is acrylic group (b)) is heated to 180°C for 3 minutes, then cooled to room temperature, and cold-pressed at room temperature to form a sheet or film; the electron beam equipment is discharged through nitrogen The air in the irradiation room, when the oxygen concentration in the irradiation room drops to 20mg / L, start the electron beam equipment, send the acrylic-terminated polylactic acid sheet or film into the irradiation room of the electron beam equipment, and close the irradiation room; at room temperature (25 ℃) with electron beam irradiation, the radiation dose is 105kGy. The softening temperature of the obtained modified acrylic-terminated polylactic acid was 191° C., the tensile strength was 39.6 MPa, the elongation at break was 13.1%, and the biodegradation rate in 140 hours was 68%.
Example Embodiment
[0063] Example 3
[0064] The block polyethylene glycol-polylactic acid copolymer (polylactic acid 3) was heated to 180 ℃ for 3 minutes, then cooled to room temperature, and cold pressed at room temperature to form a sheet or film; Air, when the oxygen concentration in the irradiation chamber drops to 100mg / L, start the electron beam equipment, send the block polyethylene glycol-polylactic acid copolymer sheet or film into the irradiation chamber of the electron beam equipment, and close the irradiation chamber; Electron beam irradiation was performed at room temperature (23° C.) with a radiation dose of 10 kGy. The softening temperature of the obtained modified block polyethylene glycol-polylactic acid copolymer was 73° C., the tensile strength was 8.9 MPa, the elongation at break was 367.8%, and the biodegradation rate in 140 hours was 91%.
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