High barrier property and high strength pbat-pga block copolymerized biodegradable polyester and preparation method thereof
A technology of PBAT-PGA and biodegradable polyester, which is applied in the field of biodegradable materials, can solve the problems of difficult dispersion of nano-fillers, uneven properties of film products, and high processing technology requirements, so as to avoid the risk of degradation, high segment rigidity, The effect of small free volume
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[0043] Preparation of film: PBAT-PGA block copolymerized biodegradable polyester is vacuum-dried at 80°C for more than 2 hours, and then the film is prepared by a film blowing machine. The processing temperature is 190~240°C, and the thickness of the prepared film is about (50±3) µm.
[0044] Film barrier test:
[0045] ①Water vapor transmission coefficient (WVP) test: Use W-B-31 water vapor transmission tester to test, refer to the national standard GB / T 1037-1988, and use the cup method to test the water vapor barrier property of the film sample. Use a sampler to take a circular film sample and measure its thickness. The test temperature is 38°C, the relative humidity is 90%RH, the pressure is 0.1MPa, and the test time is 40h. Record the water vapor transmission mass per unit volume and unit area to calculate the water vapor transmission rate. Over coefficient.
[0046] ②O 2 / CO 2 Penetration test: Yes 2 / CO 2 The transmittance of the film is tested with a VAC-V1 diffe...
Embodiment 1
[0049] Table 1 Example 1 Feeding table
[0050]
[0051] (1) Esterification-precondensation:
[0052] Weighed 1662.9g of terephthalic acid (w / %≥99.90%), 944.6g of 1,4-butanediol (w / %≥99.70%) and 57.9g of neopentyl glycol (w / % ≥99.00%) into the 10L esterification kettle 1, turn on the heating, stir evenly, raise the temperature to 180°C, carry out the esterification dehydration reaction, and react for 2 hours. When the water yield of the reaction reaches the theoretical value of 360.0g, no more water will be distilled out.
[0053] Then adjust the temperature, the reaction temperature is 200° C., the reaction pressure is 100 KPa, the pre-precondensation is carried out, the reaction is 1 hour, and the molecular weight detection is carried out by sampling.
[0054] Weighed 1789.4g of 1,6-adipic acid (w / %≥99.80%), 1154.3g of 1,4-butanediol (w / %≥99.70%) and 70.7g of neopentyl glycol ( w / %≥99.00%) into the 10L esterification kettle 2, turn on the heating, stir evenly, raise the...
Embodiment 2
[0060] Table 2 Example 2 Feeding table
[0061]
[0062] (1) Esterification-precondensation:
[0063] Weighed 1662.9g of terephthalic acid (w / %≥99.90%), 894.9g of 1,4-butanediol (w / %≥99.70%) and 115.7g of neopentyl glycol (w / % ≥99.00%) into the 10L esterification kettle 1, turn on the heating, stir evenly, raise the temperature to 180°C, carry out the esterification dehydration reaction, and react for 2 hours. When the water output of the reaction reaches the theoretical value of 360.0g, no more water will be distilled out.
[0064] Then adjust the temperature, the reaction temperature is 200° C., the reaction pressure is 100 KPa, the pre-precondensation is carried out, the reaction is 1 hour, and the molecular weight detection is carried out by sampling.
[0065] Weighed 1789.4g of 1,6-adipic acid (w / %≥99.80%), 1093.5g of 1,4-butanediol (w / %≥99.70%) and 141.4g of neopentyl glycol ( w / %≥99.00%) into the 10L esterification kettle 2, turn on the heating, stir evenly, raise ...
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