Unlock instant, AI-driven research and patent intelligence for your innovation.
A kind of high-efficiency recycling method of waste colored polylactic acid
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A polylactic acid and non-ferrous technology, which is applied in the field of waste polymer resource utilization, can solve problems such as difficulty in recycling, and achieve the effects of low cost, high yield and simple method.
Active Publication Date: 2021-03-23
WUHAN TEXTILE UNIV
View PDF2 Cites 1 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
Single-color polylactic acid materials can be directly melted and recycled, but waste PLA materials usually have many colors mixed together, making it difficult to recycle
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0039] A kind of high-efficiency recycling method of waste colored polylactic acid of the present embodiment, described method comprises the following steps:
[0040] Take the red polylactic acid waste fiber material, cut it into 5-8mm, wash it with deionized water, and put it in an oven at 100°C to dry it for later use; take 5g of the above-mentioned chopped and dried polylactic acid scrap, oxidize Magnesium 0.10g, methanol 20mL, are added together in the autoclave and sealed, and then the sealed autoclave is placed in a 140°C oven for constant temperature reaction for 3 hours; after the reaction is completed, it is cooled to room temperature, and the insoluble matter (including Insoluble catalyst and insoluble dye), the filtrate obtained by filtration is red; the filtrate obtained above is first subjected to atmospheric distillation at 60° C. to recover residual methanol, and then distilled under reduced pressure to obtain methyl lactate, and finally the red dye residue remai...
Embodiment 2
[0045] A kind of high-efficiency recycling method of waste colored polylactic acid of the present embodiment, described method comprises the following steps:
[0046] Take the red polylactic acid waste fiber material, cut it into 5-8mm, wash it with deionized water, and put it in an oven at 100°C to dry for later use; take 5g of the above-mentioned chopped and dried polylactic acid scrap, and oxidize Magnesium 0.10g and ethanol 20mL were added to the autoclave and sealed, and then the sealed autoclave was placed in an oven at 130°C for a constant temperature reaction for 3 hours; after the reaction was completed, the autoclave was cooled to room temperature, and the insoluble The obtained filtrate was red; the obtained filtrate was first distilled out of ethanol at 80°C under normal pressure, and then distilled under reduced pressure to obtain ethyl lactate, and finally the red dye residue remained.
[0047] The quantitative determination of ethyl lactate in this embodiment is...
Embodiment 3
[0050] A kind of high-efficiency recycling method of waste colored polylactic acid of the present embodiment, described method comprises the following steps:
[0051] Take the red 3D printed polylactic acid waste, cut it into 5-8mm, wash it with deionized water, and dry it in an oven at 100°C for later use; take 5g of the red polylactic acid scrap after cutting and drying, and solid alkali Catalyst: Magnesium oxide 0.10g, butanol 24g, put into the autoclave and seal it together, put the sealed autoclave in an oven at 170°C for 3 hours constant temperature reaction; after the reaction is completed, cool to room temperature, filter and separate the insoluble matter , the obtained filtrate is red; the obtained filtrate is first distilled to remove butanol under normal pressure at 120° C., and then distilled under reduced pressure to obtain butyl lactate, and finally the red dye residue remains.
[0052] The quantitative determination of butyl lactate in this embodiment is directl...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More
PUM
Login to View More
Abstract
The invention relates to an efficient recycling method of waste and old colored polylactic acid and belongs to the technical field of waste and old polymer resource utilization. The efficient recycling method of the waste and old colored polylactic acid comprises the steps of adding crushed, cleaned and dried colored polylactic acid waste to a closed reactor; adding an appropriate amount of solidbase catalyst and organic alcohol reagent to the closed reactor; and then carrying out alcoholysis on an obtained mixture for 0.5-5 hours at a temperature of 50-180 degrees centigrade; after reaction,cooling the mixture to a room temperature; filtering or centrifugally separating the cooled mixture to obtain insoluble catalyst and insoluble dye; distilling a filtering liquor at a temperature nearthe boiling point of alcohol to recycle alcohol; and carrying out reduced pressure distillation on the recycled alcohol to obtain a corresponding alkyl lactate product. The efficient recycling methodof the waste and old colored polylactic acid, provided by the invention, has the advantages that the method is rapid and simple, the method is suitable for recycling various mixed colored polylacticacids. In addition, the yield of the alkyl lactate recycled by using the efficient recycling method of the waste and old colored polylactic acid is high, and the alkyl lactate can be used as solventsof cellulose, oil paint and chromosin; the energy consumption is comparatively low; the distilled and recycled organic alcohol can be repeatedly utilized; sources of the solid base catalyst are wide;the price is cheap; and the efficient recycling method of the waste and old colored polylactic acid is easy for realization of industrial large-scale application.
Description
technical field [0001] The invention relates to the technical field of resource utilization of waste polymers, in particular, the invention relates to a high-efficiency recycling method of waste colored polylactic acid (PLA). Background technique [0002] Polylactic acid (PLA) is one of the most promising biodegradable materials derived from renewable plant resources rather than petroleum. Due to its excellent biodegradability, PLA can be completely degraded by microorganisms after being discarded, producing CO 2 And water, no pollution to the environment. As an ideal green plastic, PLA is currently being gradually used in packaging materials, disposable tableware, home appliance shells, fibers and 3D printing consumables. [0003] With the widespread use of PLA in fibers and 3D printing consumables, more and more colored polylactic acid materials have been developed. Extensive use will inevitably lead to a large amount of waste. Although waste PLA can be completely degra...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to View More 
Login to View More