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Layered hydrotalcite modified PLLA

A hydrotalcite, layered technology, applied in the field of barrier PLLA and its preparation, can solve the problem that it is difficult to improve the comprehensive performance of PLLA, thermal stability, barrier property, solvent resistance, and flame retardancy. Other properties of materials, etc., to achieve the effect of improving mechanical properties, improving barrier properties, and improving heat resistance

Pending Publication Date: 2018-04-10
桐乡守敬应用技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the mechanical properties and other properties of pure PLLA, such as thermal stability, barrier properties, solvent resistance, flame retardancy, etc., usually cannot meet the needs, which prompts people to conduct in-depth research on the modification of PLLA materials.
The traditional modification method is to blend PLLA with other polymers or add inorganic fillers, which can only improve some properties of PLLA, but it is difficult to improve the comprehensive performance of PLLA
Patent CN03149911.2 discloses a preparation method of a biodegradable resin composite material. The matrix material is PLLA, layered hydrotalcite, mica, talc, etc. as fillers (5-50wt.%). The flame retardancy has been improved to varying degrees, but the patent does not detail other properties of the composite material

Method used

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  • Layered hydrotalcite modified PLLA

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Modify the layered hydrotalcite with an aminosilane coupling agent to obtain the modified layered hydrotalcite;

[0038] (2) Place the modified layered hydrotalcite in an organic solvent and ultrasonically disperse for 1-60 minutes to obtain a layered hydrotalcite suspension;

[0039] (3) Dissolve excess trimellitic anhydride in acetone to obtain a trimellitic anhydride acetone solution; then add it to the layered hydrotalcite suspension, stir, and react at a certain temperature for 5-30 minutes to obtain a trimellitic anhydride modified layered hydrotalcite solution ,spare;

[0040] (4) Replace the gas in the reactor with nitrogen, add 415.0g of terephthalic acid and ethylene glycol into the reactor, heat up, stir, and perform the esterification reaction at 200°C. When the degree of esterification is above 90%, add The layered hydrotalcite solution modified by the catalyst and trimellitic anhydride was heated to 280° C., while vacuuming and polycondensation for 1.5 hours...

Embodiment 2

[0044] (1) Modify the layered hydrotalcite with an aminosilane coupling agent to obtain the modified layered hydrotalcite;

[0045] (2) Place the modified layered hydrotalcite in an organic solvent and ultrasonically disperse for 1-60 minutes to obtain a layered hydrotalcite suspension;

[0046] (3) Dissolve trimellitic anhydride in acetone to obtain a trimellitic anhydride acetone solution; then add it to the layered hydrotalcite suspension, stir, and react at a certain temperature for 5-30 minutes to obtain a trimellitic anhydride-modified layered hydrotalcite solution for use. ;

[0047] (4) Replace the gas in the reactor with nitrogen, add 415.0g of terephthalic acid and 184.1g of ethylene glycol into the reactor, increase the temperature, stir, and carry out the esterification reaction at 200°C until the degree of esterification is over 90% Adding the catalyst and the layered hydrotalcite solution modified by trimellitic anhydride, raising the temperature to 280°C, vacuuming at...

Embodiment 3

[0051] (1) Modify the layered hydrotalcite with an aminosilane coupling agent to obtain the modified layered hydrotalcite;

[0052] (2) Place the modified layered hydrotalcite in an organic solvent and ultrasonically disperse for 1-60 minutes to obtain a layered hydrotalcite suspension;

[0053] (3) Dissolve trimellitic anhydride in acetone to obtain a trimellitic anhydride acetone solution; then add it to the layered hydrotalcite suspension, stir, and react at a certain temperature for 5-30 minutes to obtain a trimellitic anhydride-modified layered hydrotalcite solution, ready for use ;

[0054] (4) Replace the gas in the reactor with nitrogen, add 415.0g of terephthalic acid and 184.1g of ethylene glycol into the reactor, increase the temperature, stir, and carry out the esterification reaction at 200°C. When the degree of esterification is above 90% , Adding a catalyst and a layered hydrotalcite solution modified by trimellitic anhydride, raising the temperature to 280°C, vacuumi...

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Abstract

The invention discloses a barrier-resistant PLLA (Poly-L-Lactic Acid) and a preparation method thereof. The barrier-resistant PLLA is a polyester with a barrier property. The preparation method of thelayered hydrotalcite modified PLLA is as follows: (1) modifying layered hydrotalcite by using an amino silane coupling agent, so as to obtain modified layered hydrotalcite; (2) placing the modified layered hydrotalcite in an organic solvent, and carrying out ultrasonic dispersion for 1-60 minutes, so as to obtain a layered hydrotalcite suspension liquid; (3) preparing a trimellitic anhydride modified layered hydrotalcite solution for later use; (4) polymerizing the obtained layered hydrotalcite solution and PLLA; and (5) putting obtained PLLA into an extruder, and carrying out extruding granulation. According to the invention, the layered hydrotalcite is used for in-situ modification of the PLLA; montmorillonite is grafted to side chains of the PLLA; the barrier property of a PLLA productis improved; and the layered hydrotalcite is uniformly dispersed in the PLLA, so that the mechanical property of the PLLA product is effectively improved, and the heat resistance is further improved.

Description

Technical field [0001] The present invention is a barrier PLLA and a preparation method thereof, specifically, a barrier polyethylene terephthalate. Background technique [0002] PLLA is currently the most extensively researched biodegradable material with the most potential for development. It has good biodegradability and environmental friendliness. PLLA (PLA) is a green material. The raw material comes from renewable crops. The most prominent The advantage is biodegradability. After use, it can be completely degraded to produce carbon dioxide and water without polluting the environment. PLLA also has good mechanical properties, thermoplasticity, fiber-forming properties, and high transparency. It is suitable for blow molding, extrusion, injection molding and other processing methods. It is easy to process and is defined by the industry as the most promising new packaging material in the new century. . However, the mechanical properties and other properties of pure PLLA, such...

Claims

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Application Information

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IPC IPC(8): C08G63/183C08K3/24C08K9/04C08K9/06
CPCC08G63/183C08K3/24C08K9/04C08K9/06
Inventor 朱龙泉
Owner 桐乡守敬应用技术研究院有限公司
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