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Starch/thermoplastic polyurethane (TPU) composite material with high mechanical property and preparation method thereof

A technology of thermoplastic polyurethane and composite materials, which is applied in the field of biodegradable plastics, can solve the problems of reduced mechanical properties and poor compatibility of composite materials, and achieve the effects of short production process, good mechanical properties and wear resistance, and low price

Active Publication Date: 2012-07-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems in the prior art: that is, starch has a strong hydrogen bond force and its molecular structure presents polar properties, which is different from Thermoplastic polyurethane cannot match in structure and polarity, so the compatibility of composite materials is poor, and its mechanical properties decrease significantly with the increase of starch content

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1. 10 parts of corn starch, 90 parts of TPU, 8 parts of glycerin, 0.5 parts of nano-silica (with a particle size of more than 5000 mesh), 4 parts of nitrile rubber, 3 parts of POE, and 1 part of betaine After mixing evenly, add it to the double-roll mill, knead at 160~170°C for 8 minutes, and then granulate the molten sheet through a single-screw extruder to obtain 1# starch / thermoplastic polyurethane composite material. The aspect ratio of the single-screw extruder is 35:1, the extrusion temperature is 135~160°C, and the screw speed is 80r / min.

Embodiment 2

[0040] Example 2, 20 parts of cornstarch, 80 parts of TPU, 5 parts of glycerin, 3 parts of urea, 1 part of nano-calcium carbonate (the particle size is more than 5000 mesh), 5 parts of styrene-butadiene thermoplastic elastomer, 5 parts of methyl methacrylate-butadiene-styrene terpolymer, 0.5 part of Tween-200 after mixing evenly, join the twin-screw extruder, the length-to-diameter ratio of the extruder is 40:1, The extrusion temperature is 135~175°C, the screw speed is 200r / min, and the 2# starch / thermoplastic polyurethane composite material is prepared.

Embodiment 3

[0041] Embodiment 3, with 30 parts of cornstarch, 10 parts of sorbitol, 2 parts of formamide, 1 part of nano-titanium dioxide (the particle size mesh number is more than 5000 mesh), 8 parts of styrene-butadiene thermoplastic elastomer, styrene and 9 parts of isoprene-styrene block copolymer, 1 part of silane coupling agent are mixed evenly and then added to 70 parts of TPU respectively into twin-screw extrusion with diameter (Ф) 25 and aspect ratio (L / D) 35 extruder combined with a single-screw extruder with a diameter (Ф) of 45 and a length-to-diameter ratio (L / D) of 30 for continuous plasticizing and extruding in a second-stage extruder to obtain 3# starch / thermoplastic polyurethane composite material, in which the first-stage The barrel temperature of the twin-screw extruder is 80-175°C, the screw speed is 300r / min, the barrel temperature of the second-stage screw extruder is 175-185°C, and the screw speed is 150r / min.

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Abstract

The invention relates to a starch / thermoplastic polyurethane (TPU) composite material with high mechanical property and a preparation method thereof. The method comprises the following steps of: weighing starch, TPU, a plasticizer, a toughening agent, a reinforcing agent and an interface compatilizer according to a formula, fully mixing the materials, performing mixing molding, extrusion molding and calendering molding by using a double screw extruder, a single screw extruder, a double-step screw extruder, a kneading machine, an open mill and the like with the capacity of applying shearing force, and processing at the temperature of between 100 and 190 DEG C to prepare the starch / TPU composite material. The composite material has the advantages of high mechanical property, low cost, biodegradability, simple preparation process and the like.

Description

technical field [0001] The invention belongs to the technical field of biodegradable plastics, in particular to a starch / thermoplastic polyurethane composite material with high mechanical properties and a preparation method. Background technique [0002] Thermoplastic starch plastics can be completely biodegradable, and have attracted much attention due to their advantages such as low price, abundant sources, and easy modification. Since the 1980s, with the vigorous development of starch-degradable plastics research and development, people have made great breakthroughs in the research on the physical and chemical modification, thermoplastic behavior and mechanical properties of starch. Many types of starch biodegradable plastics have been developed at home and abroad, but their mechanical properties are brittle and greatly affected by environmental humidity, which severely limits the application of thermoplastic starch plastics. The mechanical properties and water resistan...

Claims

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Application Information

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IPC IPC(8): C08L75/04C08L3/02C08L3/06C08L3/10C08L9/02C08L9/06C08L53/02C08L23/16C08L23/08C08L33/04C08K3/36C08K5/053C08K3/26C08K3/22C08K7/08
Inventor 张水洞唐勇张震
Owner SOUTH CHINA UNIV OF TECH
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