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Starch-base fully biodegradable resin with steady hydrophobic property and preparation method thereof

A resin-degrading, all-biological technology, applied in the field of biodegradable materials, can solve the problem of high water vapor transmission rate of materials, and achieve the effects of reducing degradation reaction, reasonable design and improved dispersibility

Active Publication Date: 2015-08-26
YIFAN XINFU PHARMA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] We found that although the products prepared by blending, extruding and granulating starch, water and fully biodegradable resins do not contain plasticizers, they still absorb water seriously when exposed to water, and the material has a high water vapor transmission rate.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Mix 100 parts of micronized corn starch (average particle size around 3~5μm) and 0.3 parts of titanate coupling agent in a high-speed mixer at 600RPM, and then place them in a double cone vacuum dryer at 120 ℃, -0.09MPa conditions, dry reaction for 24 hours and discharge, the discharge moisture is 0.25%. Then 30 parts of treated starch, 70 parts of PBAT (melt index 4.2g / 10min), 0.2 parts of N,N-ethylene bisstearamide, 0.4 parts of complex antioxidant [1010, 168 and triphenyl phosphate ( 1:2:3)] Mix uniformly in a high-speed mixer, and the mixed materials are extruded through the same-rotating twin-screw extruder (extrusion temperature is 132℃, screw speed is 260r / min), and drawn by air cooling The starch-based fully biodegradable resin pellets can be obtained by cutting the towline chains. The pellets are blown well, the film with a thickness of 0.020mm tears well, and the film surface is smooth. The water vapor transmission rate of starch modified film is 1120 g / m 2 ·...

Embodiment 2

[0031] Mix 100 parts of micronized tapioca starch (average particle size around 10-15μm) and 0.2 parts of aluminate coupling agent in a high-speed mixer at 600RPM, and then place them in a double cone vacuum dryer at 110 ℃, -0.095MPa conditions, drying reaction for 20 hours and discharge, the discharge moisture is 0.3%. Then 50 parts of treated starch, 30 parts of PLA (melt index 30.2g / 10min), 20 parts of PBS (melt index 25.0g / 10min), 0.5 parts of paraffin wax, 0.5 parts of composite antioxidant [1076, 626 and triphosphate Methyl ester (1:3:5)] is evenly mixed in a high-speed mixer, and the mixed material is extruded through a co-rotating twin-screw extruder (extrusion temperature is 165℃, screw speed is 230r / min), The starch-based fully biodegradable resin pellets are obtained by air-cooled drawing drag chain cutting and pelletizing. The surface of the pellets is smooth, and the surface of the injection molded cutlery products is shiny and tough. Put the cutlery products in ...

Embodiment 3

[0035] Mix 100 parts of micronized pea starch (average particle size around 7-9μm), 0.1 part of stearic acid, and 0.2 part of titanate coupling agent in a high-speed mixer at 600RPM, and then place it in a double cone vacuum In the desiccator, the material is dried and reacted for 24 hours at 125°C and -0.09MPa, and the discharge moisture is 0.2%. Then 25 parts of treated starch, 15 parts of PHA (melting index 15.2g / 10min), 60 parts of PBSA (melting index 12.3g / 10min), 0.3 part of calcium stearate, 0.3 part of paraffin wax, 0.3 part of compound antioxidant [1098, 627 and triethyl phosphate (1:2:4)] are mixed uniformly in a high-speed mixer, and the mixed material is extruded through a co-rotating twin-screw extruder (extruding temperature is 160℃, screw speed 240r / min) 0.8mm thick sheet, the surface of the sheet is smooth and shiny, and the surface of the blister box is smooth without rough spots. After being placed in a constant temperature water bath at 25°C for 24 hours, it ...

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Abstract

The invention discloses a starch-base fully biodegradable resin with steady hydrophobic property and a preparation method thereof, belonging to the technical field of biodegradable materials. The resin comprises the following raw materials in parts by weight: 20-50 parts of modified starch, 50-80 parts of fully biodegradable polyester, 0.1-5 parts of a lubricant, and 0.1-0.5 parts of an antioxidant. The starch-base fully biodegradable resin with steady hydrophobic property is rational in design, so that the dispersity of the starch is improved greatly through pre-treatment of the starch; the moisture content is relatively low, so that degradation reaction of the resin in the processing process is also reduced. Through rational micronization function, the performance of the starch-base fully biodegradable resin is improved obviously.

Description

Technical field [0001] The invention belongs to the technical field of biodegradable materials, and specifically relates to a hydrophobically stable starch-based fully biodegradable resin and a preparation method thereof. Background technique [0002] At present, a considerable part of the fully biodegradable materials on the global market are starch-based fully biodegradable materials. The addition of starch on the one hand reduces the cost of the material, on the other hand it can also enhance certain aspects of the material's performance. Such as the tearing and opening of the film. Strength; dimensional stability and heat resistance of injection molded products; melt strength of sheet processing, etc. [0003] At the same time, the current starch-based fully biodegradable materials basically add plasticizers to promote the plasticization and dispersion of starch. Plasticizers are mainly polyols and water. On the one hand, the addition of plasticizers causes alcoholysis and h...

Claims

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Application Information

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IPC IPC(8): C08L3/04C08L67/02C08L67/04C08L91/06C08L69/00C08L23/06C08K5/20C08K5/098C08B31/00
Inventor 杨科戴清文王青青殷宏军俞利生
Owner YIFAN XINFU PHARMA CO LTD
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