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Polylactic acid-starch blended material and preparation method thereof

A technology of polylactic acid and starch, which is applied in the field of polylactic acid starch blend materials and its preparation, can solve problems such as poor interface compatibility, achieve the effects of enhancing hydrophobicity, improving mechanical strength, and reducing production costs

Active Publication Date: 2012-07-11
SHANGHAI GENIUS ADVANCED MATERIAL (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the shortcomings of polylactic acid starch blend materials such as strong water absorption, poor interface compatibility, and mechanical strength, the purpose of the present invention is to provide a polylactic acid starch blend material with good compatibility and high mechanical properties

Method used

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  • Polylactic acid-starch blended material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Add 1000 g of pretreated starch, 11 g of maleic anhydride, 98 g of dibutyl phthalate, and 2.2 g of silane coupling agent vinyltrimethoxysilane into a high-speed mixer to stir and mix at room temperature for a mixing time of 10 minute;

[0028] (2) 1111g of the mixture obtained in step (1) is directly mixed with 2075g of extrusion-grade polylactic acid PLLA, and 107697g of antioxidant is granulated through a twin-screw extruder. The aspect ratio of the twin-screw extruder is 40:1, and the temperature in each zone The control is 120, 155, 175, 180, 180, 175°C.

[0029] The pretreatment starch treatment step is: disperse 1000g of cornstarch into 19L of distilled water to make a starch suspension with a concentration of 5%, pour it into an ultrahigh pressure container for 500MPa ultrahigh pressure treatment for 10h, and then dehydrate and dry at room temperature. 0.5%, to obtain pretreated starch.

[0030] Thoroughly dry the pellets obtained in the above examples in a...

Embodiment 2

[0032] (1) Add 1000 g of pretreated starch, 62.5 g of diphenylmethane diisocyanate, 162.5 g of dibutyl phthalate, and 25 g of isopropyl triisostearyl titanate as a titanate coupling agent into a high-speed mixer. The mixer is stirred and mixed at room temperature, and the mixing time is 30 minutes;

[0033] (2) 1250g of the mixture obtained in step (1) was granulated through a twin-screw extruder, mixed with 7179g of extrusion-grade polylactic acid PDLA and 101016.9g of antioxidant, and granulated again. The length-to-diameter ratio of the twin-screw extruder is 40:1, and the temperature in each zone is controlled at 120, 155, 175, 180, 180, and 175°C.

[0034] The pretreatment starch treatment step is: disperse 1000g of potato starch into 9L of distilled water to make a starch suspension with a concentration of 10%, pour it into an ultrahigh pressure container for 700MPa ultrahigh pressure treatment for 15h, and then dehydrate and dry at room temperature. 0.5%, to obtain pre...

Embodiment 3

[0037] (1) Add 1000g of pretreated starch, 114g of formamide, 286g of polyethylene glycol, and 28.6g of isopropyl titanate coupling agent tris(dioctylpyrophosphoryloxy)titanate into a high-speed mixer and stir Mix at room temperature for 40 minutes;

[0038] (2) 1428g of the mixture obtained in step (1) was granulated through a twin-screw extruder, mixed with 608g of extrusion-grade polylactic acid PLLA and 10764g of antioxidant according to the proportion and then granulated again. The length-to-diameter ratio of the twin-screw extruder is 30:1, and the temperature in each zone is controlled at 120, 155, 175, 180, 180, and 175°C.

[0039] The pretreatment starch treatment step is: disperse 1000g of wheat starch into 11.5L of distilled water to make a starch suspension with a concentration of 8%, pour it into an ultra-high pressure container for 800MPa ultra-high pressure treatment for 20h, and then dehydrate and dry the water content at room temperature <0.5%, get pretreated...

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Abstract

The invention belongs to the field of modification of high polymer blended plastics, and discloses a polylactic acid-starch blended material and a preparation method thereof. The polylactic acid-starch blended material disclosed by the invention comprises the following components in parts by weight: 448-8207 parts of polylactic acid, 1000 parts of starch, 10-114 parts of grafting agent, 36-286 parts of plasticizer, 2-29 parts of coupling agent and 3-97 parts of antioxidant. The preparation method comprises the following steps: (1) adding 1000 parts of pretreated starch, 10-114 parts of grafting agent, 36-286 parts of plasticizer and 2-29 parts of coupling agent into a high-speed mixer, and mixing at normal temperature for 10-50 minutes; and (2) granulating 1053-1429 parts of the mixture obtained in the step (1) by a double screw extruder, mixing with 448-8207 parts of polylactic acid and 3-97 parts of antioxidant and granulating, or directly mixing the mixture obtained in the step (1) with 448-8207 parts of polylactic acid and 3-97 parts of antioxidant and granulating by the double screw extruder. The product disclosed by the invention has the advantages of favorable mechanical properties and low cost.

Description

technical field [0001] The invention belongs to the field of polymer blend plastic modification, and relates to a polylactic acid starch blend material and a preparation method thereof. Background technique [0002] Polylactic acid (PLA, also known as polylactide) is a polymer crystalline compound derived from biodegradable thermoplastic polyesters, and petroleum-based polyesters such as polyethylene terephthalate (PET), Compared with polybutylene terephthalate (PBT), it has the advantages of being completely renewable and degradable. Starch has a wide range of sources, and its plasticization can be added to the resin as a filler to accelerate the physical decomposition process of plastics in nature. The polylactic acid starch blend material has attracted widespread attention in the industry, but its processing and molding and products have the following problems: poor compatibility between starch and polylactic acid, rough surface of the product; low mechanical properties;...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L3/02C08K5/1539C08K5/29C08K5/20B29B9/06B29C47/92B29C48/92
CPCB29C48/04
Inventor 吴超
Owner SHANGHAI GENIUS ADVANCED MATERIAL (GRP) CO LTD
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