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Polyether polyurethane elastomer toughened polylactic acid alloy and preparation method thereof

A polyether polyurethane and elastomer technology is applied in the field of polyether polyurethane elastomer toughening polylactic acid alloy and its preparation, which can solve the problems of poor interfacial bonding strength, fracture, poor compatibility, etc. Easy to control, high strength and modulus, good toughness effect

Inactive Publication Date: 2011-09-14
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this kind of polyester polyurethane can greatly improve the brittleness of polylactic acid, it is found through scanning electron microscopy that the compatibility between this type of polyurethane and polylactic acid is not good, and when the material is stressed, it will be affected by polylactic acid and polyurethane. Premature fracture occurs due to poor interfacial bond strength

Method used

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  • Polyether polyurethane elastomer toughened polylactic acid alloy and preparation method thereof
  • Polyether polyurethane elastomer toughened polylactic acid alloy and preparation method thereof
  • Polyether polyurethane elastomer toughened polylactic acid alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Dehydrate 12.0 g (0.012 mol) of polyethylene glycol (number average molecular weight: 1000, hydroxyl value: 118 mgKOH / g) at 120° C. and 180 Pa for 1 hour to obtain dehydrated polyethylene glycol.

[0040] In a drying reactor connected with a thermometer, a stirring paddle, a condensing tube and a gas inlet and outlet, the dehydrated polyethylene glycol is heated to 80° C., and 5.4414 g (0.0245 mol) of isophorone diisocyanate is added under nitrogen protection. The catalyst dibutyltin dilaurate that accounts for polyethylene glycol mass 0.5% carries out polymerization reaction, reacts 30min, obtains the prepolymer of isophorone diisocyanate termination; Prepolymer and 1.0814g (0.012mol) are subjected to vacuum distillation The treated small molecule diol chain extender 1,4-butanediol and 40mL solvent N,N'-dimethylformamide were subjected to chain extension reaction at 100°C for 12h, and the product was dried in a vacuum oven at 100°C to obtain a colorless Transparent, hi...

Embodiment 2

[0044] The polyurethane elastomer was prepared according to the preparation steps of the polyurethane elastomer in Example 1.

[0045] Except that the mass parts of polyurethane elastomer are 10 and the mass parts of polylactic acid are 90 (the number average molecular weight of polylactic acid is 100000), all the other operations are the same as in Example 1 to prepare polylactic acid / polyurethane alloy.

[0046] The polylactic acid / polyurethane alloy was injection molded to obtain a standard test sample, and the mechanical properties of the polylactic acid alloy were shown in Table 1.

Embodiment 3～4

[0048] Except that the mass parts of polyurethane elastomer are respectively 20,30 and the mass parts of polylactic acid are respectively 80,70 (the number average molecular weight of polylactic acid is 100000), all the other operations are the same as embodiment 1, make polylactic acid / polyurethane alloy.

[0049] The polylactic acid / polyurethane alloy was injection molded to obtain a standard test sample, and the mechanical properties of the polylactic acid alloy were shown in Table 1.

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Abstract

The invention discloses a polyether polyurethane elastomer toughened polylactic acid alloy and a preparation method thereof. The alloy is prepared from the following raw materials in parts by mass: 70-95 parts of polylactic acid and 5-30 parts of polyether polyurethane elastomer. The alloy has the advantages of high toughness, high intensity, high modulus and the like, and the elongation at break and impact strength of the alloy are enhanced along with the increase in the dosage of the polyether polyurethane elastomer. The invention further discloses a preparation method of the alloy. The method comprises the following steps of: premixing the polylactic acid with the polyether polyurethane elastomer; and melting and blending in a double screw extruder at the temperature of 180-200 DEG C to obtain the polyether polyurethane elastomer toughened polylactic acid alloy. The preparation method is easy to operate and control and is suitable for industrial production.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a polyether polyurethane elastomer toughened polylactic acid alloy and a preparation method thereof. Background technique [0002] In order to get rid of the dependence on the increasingly depleted petroleum resources, vigorously developing environmentally friendly biodegradable polymers to replace petroleum-based plastic products has become a hot spot in current research and development. Among many biodegradable polymers, polylactic acid, which has entered industrialized mass production, has emerged suddenly. Polylactic acid is a polymer chemically synthesized from lactic acid produced by biofermentation of plant starch. It not only maintains good biocompatibility and biodegradability, but also has similar properties to polypropylene and polystyrene. However, polylactic acid is brittle and its melt viscosity is low, which limits its application field. [0003] The methods to i...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L75/08C08G18/66C08G18/48
Inventor 李冬冬夏雷申屠宝卿翁志学
Owner ZHEJIANG UNIV
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