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Polylactic acid film blowing processing aid and preparation method and application thereof

A processing aid, polylactic acid technology, applied in the field of preparation of polylactic acid blown film processing aids, can solve the problems of migration of small molecular processing aids, difficulty in branching, poor compatibility of blends, etc. Good processability, good transparency, and improved blown film-forming performance

Inactive Publication Date: 2014-02-26
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these modification methods are subject to certain limitations, such as poor compatibility of blends, small molecule processing aids will migrate to the surface of the product over time, and polylactic acid itself does not have reactive functional groups and it is difficult to branch.

Method used

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  • Polylactic acid film blowing processing aid and preparation method and application thereof
  • Polylactic acid film blowing processing aid and preparation method and application thereof
  • Polylactic acid film blowing processing aid and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] After dispersing 2 parts of modified nano-silica particles in the solution, add and dissolve 70 parts of 4 mol / g polylactic acid solution, add 3 parts of catalyst stannous octoate, react at 160°C for 48 hours, then keep magnetic stirring under nitrogen atmosphere. After the reaction is completed, the reaction solution is centrifuged to obtain a white powder that is polylactic acid grafted silicon dioxide nanocomposite particles.

Embodiment 2

[0028] After dispersing 2 parts of modified nano-silica particles in the solution, add and dissolve 10 parts of 4 mol / g polylactic acid solution, add 3 parts of catalyst stannous octoate, react at 160°C for 48 hours, then keep magnetic stirring under nitrogen atmosphere. After the reaction is completed, the reaction solution is centrifuged to obtain a white powder that is polylactic acid grafted silicon dioxide nanocomposite particles. One part of the prepared polylactic acid-grafted silica nanoparticles was added into the polylactic acid matrix, melt-blended, and the blending temperature was 180°C for 15 minutes to obtain a composite material. The preferred number of parts of the polylactic acid matrix is ​​100-20 parts.

Embodiment 3

[0030] After dispersing 2 parts of modified nano-silica particles in the solution, add and dissolve 10 parts of 4 mol / g polylactic acid solution, add 3 parts of catalyst stannous octoate, react at 160°C for 48 hours, then keep magnetic stirring under nitrogen atmosphere. After the reaction is completed, the reaction solution is centrifuged to obtain a white powder that is polylactic acid grafted silicon dioxide nanocomposite particles.

[0031] With the polylactic acid prepolymer of different molecular weight size as reactant, the product infrared spectrum of embodiment 1 is as follows figure 1 Shown in a curve in middle, the infrared spectrum of embodiment 2 product is as figure 1 Shown in the middle b curve, the infrared spectrum of embodiment 3 product is as figure 1 As shown in the curve of middle c, the experimental results show that the nano-silica particles with polylactic acid long-chain branches were successfully synthesized. The SEM photos of the product of Exampl...

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Abstract

The invention discloses a preparation method of a polylactic acid film blowing processing aid, which comprises the following steps of (1) performing surface modification on nano silicon dioxide by use of a silane coupling agent, adding 0.01-6 weight parts of isocyanate substrate, and reacting at over 25 DEG C for more than 4 hours for secondary modification on the silicon dioxide; (2) taking the silicon dioxide after the secondary modification and a polylactic acid prepolymer as raw materials, preferably adding 50-200 parts of polylactic acid prepolymer into each part of silicon dioxide, introducing nitrogen into the reaction kettle, adding a metal lithium or tin catalyst, magnetically stirring at 25-140 DEG C, and heating and reacting for 1-24 hours to finally obtain solid powder; drying in a vacuum oven for 24 hours to obtain the polylactic acid film blowing processing aid. The invention also discloses an application of the polylactic acid film blowing processing aid. In the method disclosed by the invention, polylactic acid is directly grafted to the surface of the silicon dioxide to obtain polylactic acid-grafted silicon dioxide modified particles which are used as a polylactic acid processing aid, and the film blowing processability of polylactic acid is effectively improved.

Description

technical field [0001] The invention relates to a polylactic acid modifier and a preparation method thereof, in particular to a preparation method of a polylactic acid film blowing processing aid. Background technique [0002] Plastic products are indispensable in people's lives, but the traditional petroleum-based plastic products have attracted people's attention due to the "white pollution" caused by refractory degradation and the oil resource crisis. The development of environmentally friendly biodegradable polymers has become the focus of research. On this basis, polylactic acid has received more and more attention. [0003] As an environmentally friendly plastic, polylactic acid has a wide range of sources. It can use lactic acid extracted from abundant sources of agricultural products such as corn beet as a monomer, and the biodegradable polymer material obtained by chemical synthesis has truly realized that it comes from nature. , return to the concept of sustainab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08K13/06C08K9/10C08K9/06C08K9/04C08K3/36B29C49/04B29C49/78C08G18/42
Inventor 刘正英吴枫杨鸣波杨伟冯建民
Owner SICHUAN UNIV
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