PBAT/starch full biodegradation thin film and preparation method thereof
A technology of butylene adipate and polyterephthalic acid, applied in the field of materials, can solve the problems of reduced material cost, low tensile strength, low tear strength, etc.
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[0044] The invention provides a preparation method of polybutylene terephthalate-adipate / starch fully biodegradable film, comprising:
[0045] Mixing starch with a modifier for modification treatment to obtain modified starch;
[0046] Mix and extrude polybutylene terephthalate-adipate resin, modified starch, reinforcing agent, lubricant, and small-molecule plasticizer to obtain the resin for film blowing;
[0047] The blown film is blown with the resin to obtain the polybutylene terephthalate-adipate / starch fully biodegradable film.
[0048] The preparation method of a polybutylene terephthalate-adipate / starch fully biodegradable film provided by the present invention first mixes starch with a modifier for modification treatment to obtain modified starch.
[0049] The weight ratio of starch and modifier in the modified starch is preferably (90-100): (1-3); more preferably (93-100): (1-2.5); most preferably (95-100 ): (1~2); The starch is preferably corn starch.
[0050] Mi...
Embodiment 1
[0060] (1) Weigh 98.5 parts of starch, 1 part of maleic anhydride, and 0.5 parts of titanate coupling agent; the order of addition is starch, maleic anhydride, and titanate coupling agent; 90°C, continue to stir for about 3 minutes to discharge, and obtain modified starch;
[0061] (2) Weigh 60 parts of PBAT, 25 parts of modified starch, 10 parts of sorbitol liquid, 5 parts of talcum powder, 1 part of erucamide, and 1 part of ethylene bisstearamide;
[0062] (3) Add each raw material into the high-speed mixer in a certain order, and the order of addition is PBAT, modified starch, talc powder, erucamide, ethylene bisstearamide, and sorbitol liquid; the mixing speed is turned to high speed , high-speed stirring for about 10 minutes to discharge;
[0063] (4) Add the mixed raw materials into the hopper of the twin-screw extruder, set the processing temperature in each temperature zone of the extruder, the operating temperature is 100-180°C, and obtain the PBAT modified resin thr...
Embodiment 2
[0066] (1) Weigh 98.5 parts of starch, 1 part of maleic anhydride, and 0.5 parts of titanate coupling agent; the order of addition is starch, maleic anhydride, and titanate coupling agent; turn the mixing speed to high speed and stir at high speed to 90°C, continue to stir for about 3 minutes to discharge, and obtain modified starch;
[0067] (2) Weigh 55 parts of PBAT, 35 parts of modified starch, 10 parts of sorbitol, 0.5 part of erucamide, and 0.5 part of ethylene bis-stearamide;
[0068] (3) Add the raw materials into the high-speed mixer in a certain order, and the order of addition is PBAT, starch, erucamide, ethylene bisstearamide, and sorbitol; turn the mixing speed to high speed, and stir at high speed for about 10 minutes ready to discharge;
[0069] (4) Add the mixed raw materials into the hopper of the twin-screw extruder, set the processing temperature in each temperature zone of the extruder, the operating temperature is 100-180°C, and obtain the PBAT modified r...
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