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Modified starch/lactic acid oligomer reactivity blended full biological decomposition plastics and preparation thereof

A technology of modified starch and oligomers, applied in the direction of flexible covering, plant protection cover, transportation and packaging, etc., can solve the problem of heat drawing of sheets and films of reactive blends without modified starch/lactic acid oligomers problems such as stretching research, time-consuming, and energy consumption needs to be further reduced, to achieve the effect of hard performance characteristics, avoiding high energy consumption, and low price

Inactive Publication Date: 2008-07-16
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patents CN1616515A, CN1557853A, and CN1718607A all use solid-phase polymerization to prepare high-molecular-weight polylactic acid, but their solid-phase esterification is carried out between polylactic acid oligomers, and it takes a long time, and energy consumption still needs to be further reduced
[0006] Japan's Mitsubishi Resin Co., Ltd. has studied the thermal stretching orientation of polylactic acid, but its thermal stretching is limited to polylactic acid sheet and film itself, and does not involve modified starch / lactic acid oligomer reactive blend sheet and film Thermal stretching research (see Chinese patents CN 1423672A, CN 1732228A, CN 1643060A for details)

Method used

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  • Modified starch/lactic acid oligomer reactivity blended full biological decomposition plastics and preparation thereof
  • Modified starch/lactic acid oligomer reactivity blended full biological decomposition plastics and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Weighed 9.0 g of etherified starch (DST) and 21.0 g of polylactic acid oligomer (PLA) with a viscosity-average molecular weight of 45,000, which were dried in a vacuum oven, respectively, and put them into a rotary reactor (Heidolph, Germany). The reaction was carried out for 6 hours under vacuum condition, the degree of vacuum was less than 20mmHg, and the rotational speed of the reactor was 90rmp.

[0044] The obtained product was extruded in a single-screw extruder, and the four-stage temperature control was: 100°C, 160°C, 165°C, 120°C, the rotation speed was 25rmp, and the residence time in the screw was 10min. The mechanical properties of the obtained product were measured after thermal stretching at 70°C.

Embodiment 2

[0046] Weigh 9.0g of acylated starch (GST) and 21.0g of polylactic acid oligomer (PLA) with a viscosity-average molecular weight of 45,000, which are dried in a vacuum oven, and add them to the rotary reactor, program the temperature to 130°C, and continue to react under vacuum conditions 6h, the vacuum degree is less than 20mmHg, and the reactor speed is 90rmp.

[0047] The obtained product was extruded in a single-screw extruder, and the four-stage temperature control was: 100°C, 160°C, 165°C, 120°C, the rotation speed was 25rmp, and the residence time in the screw was 10min. The mechanical properties of the obtained product were measured after thermal stretching at 70°C.

[0048] Embodiment 1,2 mechanical properties see table 1 for details

[0049] Table 1 embodiment 1,2 mechanical performance test comparison

[0050]

Embodiment 3

[0059] Weigh 6.0g of etherified starch (DST) and 24.0g of polylactic acid oligomer (PLA) with a viscosity-average molecular weight of 45,000, which are dried in a vacuum oven, and add them to the rotary reactor, program the temperature to 130°C, and continue to react under vacuum conditions 6h, the vacuum degree is less than 20mmHg, and the reactor speed is 90rmp.

[0060] The obtained product was extruded in a single-screw extruder, and the four-stage temperature control was: 100°C, 160°C, 165°C, 120°C, the rotation speed was 25rmp, and the residence time in the screw was 10min. The mechanical properties of the obtained product were measured after thermal stretching at 70°C.

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Abstract

The invention discloses a modified starch / lactic acid oligomer reactive blending total biolysis plastic. The modified starch / lactic acid oligomer reactive blending total biolysis plastic comprises plastic master batch that is used as raw material and an accessory ingredient. Mass composition of the plastic master batch: 2-50 portions of modified starch and 2-70 portions of lactic acid oligomer. The lactic acid oligomer that is synthesized by a one-step method is selected to go through continuous coextrusion together with the modified starch that has low cost by a solid phase condensation method, then auxiliary homotaxial or double-axis is provided for strengthening thermal stretch, thus obtaining the total biolysis plastic that has performance characteristics of being hard and tenacious and low price. The production cost, tensile strength, elongation at break and Young modulus of the total biolysis plastic are better than the existing relevant total biolysis plastic. The total biolysis plastic prepared by the invention can be applied in developing green consumables of high-tech electronic products, disposable packing materials, hotel articles, agricultural mulching film and so on, thus realizing greening of high-tech industries, releasing white pollution and saving deficient petroleum resource.

Description

technical field [0001] The invention relates to a fully biodegradable plastic and a preparation method thereof, in particular to a modified starch / lactic acid oligomer reactive blended fully biodegradable plastic and a preparation method thereof. Background technique [0002] At present, polyolefin plastics are widely used, and the environmental hazards of various waste plastics produced are becoming more and more serious. White pollution has become a global threat; in addition, with the gradual depletion of petroleum resources, it will inevitably lead to petroleum pollution such as PE, PP, PS, etc. The price of base plastics rose until it finally faded out of the market. Countries are looking for and discovering biodegradable plastics to replace petroleum-based plastics. However, most of the "degradable" plastic products currently on the market are partially degradable plastics made by blending modified starch and polyolefin. Only the starch is partially degraded, while th...

Claims

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Application Information

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IPC IPC(8): C08L3/04C08L67/04B29C69/02B29C47/38B29C47/66B29C47/92B29C47/12B29C55/00A01G13/02B65D65/02B29C48/92B29C48/30B29C48/395
CPCB29C47/92B29C48/92B29C2948/92704B29C2948/92895
Inventor 李十中张政朴刘小刚赵乃鹏
Owner TSINGHUA UNIV
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