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Modification method for improving compatibility and interface associativity of polylactic acid/starch blend

A starch blend and interfacial combination technology, which is applied in the direction of tubular objects, other household appliances, flat products, etc., can solve the problems of low mechanical and thermal properties, poor dispersion, and poor compatibility of polylactic acid/starch blends , to achieve good biodegradability, low cost, and improved mechanical and thermal properties

Inactive Publication Date: 2009-09-09
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low mechanical and thermal properties of PLA / starch blends, it is difficult to be widely used.
This is mainly due to the poor compatibility of native starch in the polylactic acid matrix, poor dispersion and poor interfacial bonding.

Method used

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  • Modification method for improving compatibility and interface associativity of polylactic acid/starch blend
  • Modification method for improving compatibility and interface associativity of polylactic acid/starch blend
  • Modification method for improving compatibility and interface associativity of polylactic acid/starch blend

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Starch and polypropylene glycol (compatibilizer) were mixed for 10 minutes by a high-speed mixer at a mass ratio of 90:10;

[0024] (2) The above-mentioned powder and polylactic acid granules are extruded and granulated by twin-screw blending according to a certain mass ratio of 40:50, and the blending temperature is 150-230° C. to form polylactic acid / starch blended modified resin granules;

[0025] (3) The above granules are injection molded into standard splines by an injection molding machine. The mechanical properties were tested by impact strength tester and universal testing machine.

Embodiment 2

[0027] (1) Starch and polypropylene glycol (compatibilizer) are mixed by mass ratio 90:10 by high-speed kneader (500rpm) for 10 minutes;

[0028] (2) The above-mentioned powder, TDI (toluene diisocyanate) and polylactic acid particles are mixed in a low-speed mixer (50rpm) in a mass ratio of 40:50:1, and then extruded and granulated by twin-screw blending. The blending temperature 150-230°C to form polylactic acid / starch blended modified resin particles;

[0029] (3) The above granules are injection molded into standard splines by an injection molding machine. The mechanical properties were tested by impact strength tester and universal testing machine.

[0030] The results of Example 1 and 2 are compared as follows:

[0031]

[0032] As can be seen from the comparison table above, the tensile strength of the blend with only compatibilizer added is lower than PLA and PP, the elastic modulus is lower than PLA but higher than PP, and the flexural modulus is lower than PLA b...

Embodiment 3

[0038] (1) Starch and polytetrahydrofuran (compatibilizer) were mixed for 15 minutes through a high-speed kneader (500rpm) at a mass ratio of 80:20;

[0039] (2) The above-mentioned powder, TDI and polylactic acid particles are mixed in a low-speed mixer (60rpm) at a mass ratio of 40:50:5, and are extruded and granulated by twin-screw blending. The blending temperature is 150-230°C, Form polylactic acid / starch blend modified resin particles;

[0040] (3) The above granules are injection molded into standard splines by an injection molding machine. The mechanical properties were tested by impact strength tester and universal testing machine.

[0041]

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Abstract

The invention relates to a modification method for improving compatibility and interface associativity of a polylactic acid / starch blend. The modification method comprises the following steps: (1) mixing native starch with a compatibilizer according to the mass ratio of 60-90:10-40 in a high speed kneader for 10-30 minutes; and (2) mixing the powder with polylactic acid particles according to the mass ratio of 10-90:10-90, adding an isocyanate coupling agent, and forming polylactic acid / starch blended modified resin slices by blending, extrusion and granulation of a double screw extruder at the blending temperature of 150-230 DEG C and screw speed of 25-500rpm. The polylactic acid / starch blend prepared by the modification method has good biodegradability, the modification method has the advantages of low cost, improved compatibility, interface associativity, mechanical property and thermal property of the modified polylactic acid / starch blend, and the polylactic acid / starch blend replaces general-purpose plastics in certain simple application.

Description

technical field [0001] The invention belongs to the field of modification and preparation of polylactic acid / starch blends, in particular to a modification method for improving the compatibility and interfacial bonding of polylactic acid / starch blends. Background technique [0002] Polylactic acid (PLA) is a biodegradable polymer material with a wide range of sources. At present, PLA is more and more widely used in biomedical engineering, but it is still rarely used in the field of general plastics. [0003] From the current situation of PLA production and research at home and abroad, it can be seen that the main problem hindering the development of the PLA industry is the lengthy synthesis route, which leads to high product prices, making it difficult for its products to be widely promoted in the fields of packaging, agriculture, and textiles. The existing technology reduces the production cost of PLA products by adding starch as a filler. However, due to the low mechanica...

Claims

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Application Information

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IPC IPC(8): C08L3/02C08L67/04C08L71/02C08L65/00C08K5/29B29B9/06B29B9/12B29C47/92B29D7/01B29D23/00B29C48/40B29C48/92
CPCB29C48/92B29C2948/92704B29C48/04B29C48/40B29C2948/9259B29C2948/92885B29C2948/92895
Inventor 余木火史凡吴超徐晓倩张辉李水滕翠青韩克清
Owner DONGHUA UNIV
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