Method for thermochemically recovering monomer from waste poly(p-dioxanone) polymer
A polydioxanone and polymer technology, applied in the direction of organic chemistry, can solve the problems of incomplete repolymerization, degradation rate, molecular weight impact, and slow degradation rate, etc., so as to facilitate popularization and use and shorten the recycling cycle , The effect of not corroding the equipment
Active Publication Date: 2014-06-25
成都普利铭医用材料科技有限责任公司
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AI Technical Summary
Problems solved by technology
Moreover, even if polydioxanone is degraded for a long time, the oligomers of polydioxanone are mainly obtained, and it is not possible to completely obtain the monomer of polydioxanone (PDO) for regeneration. Polymerization utilization, and the degradation rate will also be affected by the molecular weight
So in general, the degradation rate of polydioxanone hydrolysis is too slow for recycling waste or discarded PPDO, and the final product is not PDO monomer that can be directly repolymerized and reused. Therefore, This is not only a waste of resources, but also a waste of expensive resources
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment 1
[0030]Put the blend of 85 parts of waste polydioxanone and 15 parts of polystyrene directly into the cracker, heat up to 220 °C at 40 °C / min for 150 min under an inert gas atmosphere, and collect the liquid Part, the percentage composition of the monomer in the measured liquid is 92.3%.
[0031] The recovery of monomer was calculated to be 75.8%.
Embodiment 2
[0033] Put the discarded composite material of 97 parts of polydioxanone and 3 parts of montmorillonite directly into the cracker, heat up to 240 °C at 10 °C / min for 95 min under an inert gas atmosphere, and collect the liquid part. The percent content of monomer in the liquid was measured to be 97.9%.
[0034] The recovery of monomer was calculated to be 88.1%.
Embodiment 3
[0036] Put the waste polydioxanone directly into the cracker, heat up to 250°C for 63 minutes under an inert gas atmosphere at 10°C / min, collect the liquid part, and measure the percentage of monomer in the liquid as 98.8%.
[0037] The recovery of monomer was calculated to be 88.8%.
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The invention discloses a method for thermochemically recovering a monomer from a waste poly(p-dioxanone) polymer. The method comprises the steps of directly putting the waste poly(p-dioxanone) polymer into a pyrolyzer, or uniformly stirring and mixing the waste poly(p-dioxanone) polymer and 0.1-10 parts of catalyst, then, putting a mixture into the pyrolyzer, heating to the temperature of 220-330 DEG C at the heating speed of 1-40 DEG C / min in an inert gas atmosphere, carrying out pyrolysis for 25-150min or 25-120min, and collecting a liquid part; or directly putting the waste poly(p-dioxanone) polymer into the pyrolyzer, or uniformly stirring and mixing the waste poly(p-dioxanone) polymer and 0.1-10 parts of catalyst, then, putting the mixture into the pyrolyzer, heating to the temperature of 180-260 DEG C at the heating speed of 1-40 DEG C / min, carrying out pyrolysis for 30-220min or 20-210min at the degree of vacuum of 10-5,000Pa, and collecting the liquid part, namely the monomer. According to the method, the waste poly(p-dioxanone) polymer is efficiently transformed into the high-purity p-dioxanone monomer directly through heating, so that a feasible way for the quick recovery and recycling of a poly(p-dioxanone) material is found, the gap that the poly(p-dioxanone) material is directly transformed into the high-purity p-dioxanone monomer is filled up, and the problem of resource waste in the prior art is avoided.
Description
technical field [0001] The invention belongs to the technical field of thermochemical recovery of waste polymer materials, and specifically relates to a simple pyrolysis degradation (thermochemical) method and on this basis, simultaneously depressurizing or / and adding different acid-base catalysts to recover waste polymer materials. Process for conversion of dioxanone polymers to monomers. Background technique [0002] The macromolecular chain of the biodegradable material polydioxanone (PPDO) contains both ester bonds and ether bonds, making it have good biodegradability, bioabsorbability and biocompatibility, and good forming Processability, so it can be used in surgical sutures, orthopedic fixation materials and tissue repair materials. Since the cost of p-dioxanone (PDO), the monomer for synthesizing PPDO, has been greatly reduced in recent years, this medical polymer material with excellent performance has become the most cost-competitive biodegradable synthetic polyme...
Claims
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Patent Timeline
Login to View More IPC IPC(8): C07D319/12
CPCC07D319/12
Inventor 王玉忠李小阳周茜杨科珂
Owner 成都普利铭医用材料科技有限责任公司