Poly diol binary acid ester modified polylactic acid alloy
A technology of glycol ester and dibasic acid, which is applied in the field of polymer resin composition, can solve the problems of insufficient processing performance and heat resistance of polylactic acid, achieve shortening of injection molding cycle, expand application fields, excellent mechanical properties and thermal performance effect
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Embodiment 1
[0033] Mix 35 parts of polybutylene succinate (weight average molecular weight: 170,000), 65 parts of polylactic acid (molecular weight: 270,000) and 0.1 part of antioxidant, then dry it at 70°C for more than 4 hours, The water content was determined to be 0.06%, pelletized by a twin-screw extruder, the temperature of the melting section was 205°C, the temperature of the extrusion section was 195°C, and after drying at 70°C, the mechanical property test specimens were injected for performance testing. Among them, polybutylene succinate is made by condensation polymerization process: dibasic acid and dibasic alcohol are esterified at 180°C under normal pressure at a molar ratio of 1:1.3 in a reaction device, and then heated at 280°C It is formed by organotin-catalyzed decompression polymerization.
[0034] According to GB / T1040-1992, GB / T9341-2000 and GB1634-79, the performance of the polylactic acid alloy material detected is better than that of the comparative example, the tens...
Embodiment 2
[0036] 35 parts of polybutylene succinate-adipate (weight average molecular weight 220,000, adipic acid content 20%), 65 parts of polylactic acid (molecular weight 480,000) and 0.1 part of antioxidant Finally, dry at 70°C for more than 4 hours, measure the moisture content to 0.07%, and then directly blow the film on the blown film machine, the temperature of the plasticizing section is 175°C, and the extrusion section (the temperature at the die) is 170°C.
[0037] According to GB13022-91 and QB / T1130-91, the obtained polylactic acid alloy film was tested for performance. The elongation at break was: 340% in the transverse direction and 370% in the longitudinal direction; the tensile strength was: 37MPa in the transverse direction and 33MPa in the longitudinal direction; the tear strength was : Horizontal 120N / mm, vertical 120N / mm. The obtained film can be used to produce products such as shopping bags and agricultural films.
Embodiment 3
[0039] 15 parts of polybutylene succinate-adipate (weight average molecular weight is 220,000, adipic acid content 20%), 25 parts of polybutylene succinate (weight average molecular weight is 170,000), 60 parts of polylactic acid (molecular weight: 600,000) and 0.1 part of antioxidant are mixed and dried at 70°C for more than 4 hours. The moisture content is determined to be 0.07%, and pelletized by a twin-screw extruder. The temperature of the melting section is 210 ℃, extruded section at 200 ℃, after drying at 70 ℃, perform performance test on injection molding mechanical property test sample.
[0040] According to GB / T1040-1992, GB / T9341-2000 and GB1634-79, the tensile strength of the obtained polylactic acid alloy material is 42Mpa, the elongation at break is 120%, the flexural modulus is 1600MPa, and the heat distortion temperature is 76°C. The obtained material can be used for plastic-absorbing products such as electronic product lining packaging and medical packaging. ...
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