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Photoactive polylactic acid acrylate degradation material

A technology of lactic acid acrylate and degradable materials, which can be used in applications, coatings, inks, etc., can solve the problems of limiting the use and promotion of polylactic acid, complicated processes, and high cost of polylactic acid, achieving excellent comprehensive performance, expanding the scope of application, and degrading The effect of speed reduction

Inactive Publication Date: 2014-08-27
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cost of polylactic acid prepared by the two-step method, that is, the lactide ring-opening method, is high and the process is complicated, and the cyclization and purification of lactic acid are difficulties in the preparation of lactide, which further limits the use and promotion of polylactic acid.

Method used

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  • Photoactive polylactic acid acrylate degradation material

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Add 100 parts of lactic acid (purity > 95%) into the reaction kettle, at 120°C, vacuumize the reaction system to control the pressure of the reaction system at 50-30KPa, react for 2 hours, and remove the moisture generated by the system to obtain the polylactic acid prepolymer; Add 1 part of pentaerythritol, 0.5 part of SnCl to the system 2 +TSA (mass ratio SnCl 2 : TSA= 1:1) composite catalyst, the temperature was raised to 180°C, the pressure inside the reactor was kept at 30-10 KPa, and the reaction was carried out for 8 hours to obtain hydroxyl-terminated polylactic acid. Add 100 parts of hydroxyl-terminated polylactic acid and 50 parts of toluene into the reactor, raise the temperature to 90°C, and gradually add 10 parts of acrylic acid, 0.5 parts of p-toluenesulfonic acid and 0.15 parts of hydroquinone polymerization inhibitor within 0.5 hours. Then the temperature was raised to 130° C., the pressure in the reactor was kept at 30-10 KPa, and the reaction was carr...

Embodiment 2

[0033] Add 100 parts of lactic acid (purity > 95%) into the reaction kettle, at 120°C, vacuumize the reaction system to control the pressure of the reaction system at 50-30KPa, react for 4 hours, remove the moisture generated by the system to obtain a polylactic acid prepolymer; add 10 Parts of diethylene glycol and 0.5 parts of SnCl 2 +TSA (mass ratio SnCl 2: TSA= 1:1) composite catalyst, heat up to 140°C, keep the pressure in the reactor at 30-5 KPa, react for 4 hours to obtain hydroxyl-terminated polylactic acid; then add 100 parts of hydroxyl-terminated polylactic acid and 30 parts of toluene into the reactor , the temperature was raised to 90°C, and 30 parts of acryloyl chloride, 1 part of p-toluenesulfonic acid and 0.1 part of hydroquinone inhibitor were gradually added in 0.5 hours. Then heat up to 140°C, keep the pressure in the reactor at 30-5 KPa, and react for 3 hours to obtain active polylactic acid acrylate with terminal double bonds; mix polylactic acid acrylate...

Embodiment 3

[0035] Add 100 parts of lactic acid (purity > 95%) into the reactor, at 120°C, vacuum control the pressure of the reaction system at 70-50KPa, react for 6 hours, remove the moisture generated by the system to obtain a polylactic acid prepolymer; add 35 Part ethylene glycol, 0.5 part SnCl 2 +TSA (mass ratio SnCl 2 : TSA= 1:1) composite catalyst, heat up to 200°C, keep the pressure in the reactor at 50-30 KPa, react for 12 hours, refine the reactant to obtain hydroxyl-terminated polylactic acid; then mix 100 parts of hydroxyl-terminated polylactic acid, 90 parts Add toluene to the reaction kettle, raise the temperature to 90°C, gradually add 1 part of methacrylic anhydride, 5 parts of p-toluenesulfonic acid and 0.5 parts of hydroquinone polymerization inhibitor within 0.5 hours. Then the temperature was raised to 110° C., the pressure in the reactor was kept at 50-30 KPa, and the reaction was carried out for 8 hours to obtain terminal double bond active polylactic acid acrylate...

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Abstract

The invention relates to a photoactive polylactic acid acrylate degradation material. Lactic acid and polyol are used as raw materials, and are processed through a melt polycondensation technology to prepare a hydroxyl-terminated polylactic acid prepolymer, and an acrylic acid monomer reacts with the hydroxyl-terminated polylactic acid prepolymer to prepare double bond-terminated photoactive polylactic acid acrylate. The molecular weight and the molecular structure of the photoactive polylactic acid acrylate can be adjusted by adjusting the kind and amount of polyol in order to improve the product performances. The prepared photoactive polylactic acid acrylate can be combined with an active diluent and a photoinitiator in order to realize crosslinking curing under UV irradiation, improve the thermal stability after curing and reduce the degradation rate. A one-step method is combined with a UV light curing technology in the invention, so a new approach is provided for the preparation of the photoactive polylactic acid acrylate degradation material, and a new direction is provided for the reasonable utilization of one-step synthesized low molecular weight polylactic acid.

Description

technical field [0001] The invention belongs to the field of biodegradable materials, in particular to a photoactive polylactic acid acrylate biodegradable material. Background technique [0002] Polylactic acid (PLA) is a biodegradable polyester-based material. Lactic acid, the raw material for synthesizing polylactic acid, comes from natural crops such as corn. After being discarded, the product can be degraded into water and carbon dioxide in the natural environment. Therefore, polylactic acid is biodegradable and recyclable. In addition, it has good biocompatibility and mechanical properties. excellent. The preparation process of polylactic acid mainly includes: one-step polymerization method (referred to as one-step method), and two-step polymerization method (referred to as two-step method). The one-step method is to directly polymerize refined lactic acid. This method is the earliest and simplest method for preparing polylactic acid. The one-step method for preparin...

Claims

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Application Information

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IPC IPC(8): C08F283/02C08G63/06C09D4/02C09J4/02C09D11/101
Inventor 赵西坡彭少贤吴涛寇志敏
Owner HUBEI UNIV OF TECH
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