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System for evaluating polyurethane degradation

A technology of polyurethane and polyurethane film is applied in the field of evaluation system of polyurethane degradation, which can solve the problems of high anti-microbial degradation, inability to fully characterize the degradation effect of polyurethane plastics, high economic and labor costs, and achieve the effect of improving evaluation efficiency.

Active Publication Date: 2021-03-19
NANJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Traditional waste plastic treatment methods mainly include landfill, incineration, and mechanical recycling, which have high economic and labor costs and can cause secondary pollution, so biodegradation has become a global research hotspot
However, polyurethane has high resistance to microbial degradation, and the current evaluation methods for characterizing the degradation effect of polyurethane are uneven, which cannot fully characterize the degradation effect of polyurethane plastics

Method used

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  • System for evaluating polyurethane degradation
  • System for evaluating polyurethane degradation
  • System for evaluating polyurethane degradation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1: bacterial strain P7 is to the degradation characterization method of waterborne polyurethane Impranil DLN:

[0037] In the inorganic salt medium with a final concentration of Impranil DLN of 1% (v / v), insert the seed liquid according to the inoculum amount of 10% v / v, culture at 30°C with shaking at 120rpm, sample every 1d, 4000rpm, 4°C Centrifuge for 5 minutes under the same conditions (to aggregate the bacteria at the bottom to reduce the influence of the bacteria on transparency), and use the supernatant of the fermentation broth for OD 600nm Measure the turbidity and calculate the degradation rate of DLN; degrade the fermentation supernatant of the 5th day and the fermentation supernatant of the control (not inoculated) with freeze-drying machine respectively, and the solids after freeze-drying are at 2500cm -1 ~800cm -1 range for FTIR spectroscopy.

[0038] Depend on figure 2 a It can be seen that the control group (not inoculated with bacteria) h...

Embodiment 2

[0040] Embodiment 2: Degradation characterization method of bacterial strain P7 to PU film:

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Abstract

The invention belongs to the technical field of biological treatment, and particularly discloses a system for evaluating polyurethane degradation. A seed solution for degrading polyurethane bacteria is inoculated into an inorganic salt culture medium containing polyurethane to culture and degrade polyurethane; and then, the degradation effect is evaluated by any one or a combination of mass loss,electron microscope scanning, infrared spectrum detection, gel chromatography detection, turbidity and degradation product identification, wherein the polyurethane is waterborne polyurethane or a polyurethane film. According to the invention, a system for evaluating polyurethane degradation is established; namely, two polyurethane substrates (PU simulant Impranil DLN and PU film) are subjected tomicrobial degradation; the degradation condition of a polyurethane substrate is evaluated by means of turbidity change, mass loss, surface degradation condition and the like based on physical characterization and by means of surface functional group change, molecular weight change, degradation product identification and the like based on chemical characterization, so that the degradation effect ofpolyurethane can be completely characterized.

Description

technical field [0001] The invention belongs to the technical field of biological treatment, and in particular relates to a system for evaluating the degradation of polyurethane. Background technique [0002] Polyurethane (PU) is a polymer containing urethane bond repeating unit structure, which is formed by condensation of three components: polyisocyanate, polyol and chain extender. Therefore, various types of PUs can be synthesized by varying the types and ratios of polyols and isocyanates. Among them, according to the different types of polyols, polyurethanes are divided into two categories, namely polyester polyols and polyether polyols. Polyurethane products mainly include the following types: foam plastics, elastomers, fiber plastics, fibers, leather shoe resins, coatings, adhesives and sealants, among which foam plastics account for the largest proportion and are widely used in packaging, sound insulation, construction, automobiles, Footwear industry and medical ind...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12Q1/02C12R1/645
CPCC12Q1/02G01N2333/37Y02W30/62
Inventor 董维亮刘嘉唯姜岷何洁周杰许斌徐安明
Owner NANJING UNIV OF TECH
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