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Polylactic acid composite material and preparation method thereof

A composite material and polylactic acid technology, applied in the field of polylactic acid composite material and its preparation, can solve the problems of high equipment investment cost, decreased mechanical properties, poor compatibility between starch and polylactic acid, etc. simple craftsmanship

Active Publication Date: 2020-11-13
汪健捷
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the cost of the starch / polylactic acid composite material obtained by physical methods has been reduced, the mechanical properties of the starch / polylactic acid composite material are reduced due to the poor compatibility of starch and polylactic acid; the starch / polylactic acid composite material obtained by chemical methods is The capacity is improved and the mechanical properties are improved, but the investment cost of equipment is higher

Method used

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  • Polylactic acid composite material and preparation method thereof
  • Polylactic acid composite material and preparation method thereof

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preparation example Construction

[0022] see figure 1 , a method for preparing a polylactic acid composite material according to an embodiment, comprising the following steps S110-S130:

[0023] S110, mixing starch, lactide and biomass charcoal sulfonic acid to obtain a precursor.

[0024] Further, the mass ratio of starch and lactide is 1:(0.3-0.5).

[0025] Further, the mass of biomass charcoal sulfonic acid is 0.2%-0.5% of the total mass of starch and lactide.

[0026] S120, reacting and extruding the above precursor to obtain modified starch.

[0027] In this embodiment, the above-mentioned reactive extrusion is carried out in a twin-screw extruder.

[0028] Further, the temperature of the above reaction extrusion is as follows according to the forward direction of the material: 80°C-90°C, 90°C-100°C, 100°C-120°C, 120°C-130°C, 120°C-130°C, 100°C-110°C ℃.

[0029] Further, the temperature of the above-mentioned reactive extrusion is as follows according to the advancing direction of the material: 85°C,...

Embodiment 1

[0046] 1000g starch, 500g lactide and 3g biomass charcoal sulfonic acid are mixed uniformly in a high mixer to obtain a precursor; the precursor is reactively extruded through a twin-screw extruder (reactive extrusion temperature is from the feeding section to the head In order: 85°C, 95°C, 110°C, 120°C, 120°C, 120°C, 105°C, screw speed 20rpm) to obtain modified starch; then mix 1500g of modified starch with 3000g of polylactic acid in a high mixer Afterwards, it is melted and extruded by a twin-screw extruder (the extrusion temperature from the feeding section to the machine head is: 120°C, 140°C, 160°C, 170°C, 170°C, 175°C, 170°C, and the screw speed is 150rpm). Polylactic acid composite material.

[0047] After testing, the polylactic acid composite material prepared in Example 1 has a tensile strength of 39.8MPa, an elongation at break of 10.6%, and an impact strength of 10.8KJ / m 3 .

Embodiment 2

[0049] 1000g starch, 300g lactide and 6.5g biomass charcoal sulfonic acid are mixed uniformly in a high mixer to obtain a precursor; The head is in sequence: 85°C, 95°C, 110°C, 120°C, 120°C, 120°C, 105°C, the screw speed is 5rpm) to obtain modified starch; then 1300g of modified starch and 13000g of polylactic acid are mixed in a high mixer After mixing, it is melted and extruded through a twin-screw extruder (the extrusion temperature from the feeding section to the machine head is: 120°C, 140°C, 160°C, 170°C, 170°C, 175°C, 170°C, and the screw speed is 50rpm) Granulated polylactic acid composite material.

[0050] After testing, the polylactic acid composite material prepared in Example 2 has a tensile strength of 51.2MPa, an elongation at break of 8.8%, and an impact strength of 9.5KJ / m 3 .

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Abstract

The invention relates to a polylactic acid composite material and a preparation method thereof. The preparation method comprises the following steps: mixing starch, lactide and biomass char sulfonic acid so as to obtain a precursor, performing reaction extrusion on the precursor so as to obtain modified starch, mixing the modified starch with polylactic acid, and performing melt extrusion so as toobtain the polylactic acid composite material. According to the preparation method of the polylactic acid composite material, the catalyst biomass char sulfonic acid is non-toxic and efficient and more environmentally friendly, the process is simple, and the lactide is grafted onto the starch through the reactive extrusion method, so that the production efficiency is improved greatly, the equipment investment is increased greatly, and the production process is shortened greatly.

Description

technical field [0001] The invention relates to the technical field of biodegradable materials, in particular to a polylactic acid composite material and a preparation method thereof. Background technique [0002] Polylactic acid is a biodegradable plastic with good mechanical properties. It has a wide range of uses, but its application is limited due to its high price. Therefore, research on reducing the cost of polylactic acid came into being. Starch and polylactic acid were compounded to prepare starch / polymer Lactic acid composite material is one of the effective ways. At present, there are many preparation methods of starch / polylactic acid composite materials, which can be summarized as physical blending method and chemical modification method. Although the cost of the starch / polylactic acid composite material obtained by physical methods has been reduced, the mechanical properties of the starch / polylactic acid composite material are reduced due to the poor compatibili...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08L3/04C08B31/00
CPCC08B31/00C08L67/04C08L2201/06C08L3/04
Inventor 舒友胡扬剑陈迪钊欧阳跃军张再兴罗琼林张慧
Owner 汪健捷