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Toughened and reinforced polylactic acid nano composite material and preparation method thereof

A technology of nanocomposite materials and composite materials, which is applied in the field of preparation of polymer blends/layered silicate nanocomposites, can solve problems such as performance degradation, improve mechanical properties, reduce phase separation, and improve intercalation effects Effect

Inactive Publication Date: 2007-09-19
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as a pair of thermodynamically incompatible biodegradable polymer blends, PLA and PCL often have phase separation in the microstructure of the material, resulting in a significant decline in some properties, and there is still room for further improvement in the overall performance of the material.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0038] The preparation method of the modified organic montmorillonite that the present invention adopts is:

[0039] 1. Disperse Na-montmorillonite and alkylamine in a mass ratio of 100:1-5 in 70-90°C deionized water evenly, and make the mass percent concentration of Na-montmorillonite less than 8%, and continue to stir vigorously for 3 ~5 hours; filtered, washed and set aside;

[0040] 2. Stir and mix the following components according to the following mass percentages at 70-90°C, and then reflux for 3-5 hours; filter with suction, wash with deionized water, and dry at 100-105°C. 300 mesh sieves are sieved and ground to obtain modified organic montmorillonite; the used components and mass percentages are:

[0041] 5-20% of the modified montmorillonite obtained through step a,

[0042]80%~95% ethanol aqueous solution 70~95%,

[0043] Silane coupling agent 1~5%,

[0044] 0.1mol / L concentrated hydrochloric acid 0.01~0.05%.

Embodiment 1

[0045] Example 1: 100 parts of vacuum-dried pure polylactic acid are placed in a torque rheometer at 140 to 210°C and a rotating speed of 20 to 100rpm is melt-processed for 7 to 20 minutes, and then processed in a thermocompression molding machine at 140 to 100°C. Hot press at 210°C for 5-20min to form a thin plate. Its performance is shown in Table 1.

Embodiment 2

[0046] Example 2: 89 parts of vacuum-dried polylactic acid PLA, 10 parts of PCL and 1 part of ordinary organically modified montmorillonite were mixed and put in a torque rheometer at 140-210 ° C and a speed of 20-100 rpm. Melt blending and intercalation for 7 to 20 minutes, and then hot pressing at 140°C to 210°C for 5 to 20 minutes in a hot press molding machine to form a thin plate. Its performance is shown in Table 1.

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Abstract

The invention relates to method of preparing secondary functionalization organic modified montmorillonite (TFC), toughening and reinforcement biodegradable polylactic acid nano composite material using the organic montmorillonite and preparing method thereof. The novel double-function group organic modified montmorillonite (TFC) enhances adhesion force between montmorillonite and polymer molecule and obviously increases property of the composite material. The toughening and reinforcement biodegradable polylactic acid nano composite material is prepared by using polylactic acid as main raw material, and adding certain poly(epsilon-caprolactone) and lactic acid-epsilon-caprolactone copolymer; plasticizer selects acetyl tri-n-butyl citrate, tri-n-butyl citrate, triethyl citrate, dioctyl phthalate, and dibutylphthalate; lubricant selects aluminum stearate and calcium stearate; heat stabilizer selects maleic anhydride and epoxy soybean oil (EOS); and intensifier selects TFC montmorillonite (MMT). The prepared composite material possesses high strength and good toughness, and is hopeful of replacing traditional non-degradable material to be applied in field such as packaging, medical, and engineering for solving environment problems generated by white pollution.

Description

technical field [0001] The invention relates to a biodegradable polylactic acid blend nanocomposite material and a preparation method thereof, belonging to the technical field of polymer blend / layered silicate nanocomposite material preparation. Background technique [0002] Polylactic acid (PLA) is a synthetic linear aliphatic polyester, which is a synthetic polymer that is completely biodegradable in nature. Its synthetic monomer lactic acid is widely derived from agricultural products, and the degradation products are water and carbon dioxide which are harmless to the environment. The material has good mechanical strength, thermoplasticity, fibrillation and transparency, and is suitable for a variety of processing methods. It is considered by the industry to be the most promising new material in the new century. However, pure polylactic acid itself is a linear polymer with high brittleness, low heat distortion temperature (54°C under 0.46MPa load), poor impact resistance...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08K9/04C08K5/541C08K5/09C08K5/10C08K5/19C08L101/00
Inventor 俞臻阳尹静波鲁晓春戴征展李孝秀颜世峰陈学思
Owner SHANGHAI UNIV
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