Composite 3D printing material containing coffee grounds as well as preparation method and application of composite 3D printing material

Abstract

The invention provides a composite 3D printing material containing coffee grounds as well as a preparation method and application of the composite 3D printing material. The composite 3D printing material is prepared from the following raw materials in parts by weight: 10 to 55 parts of modified coffee grounds, 45 to 90 parts of polylactic acid, 1 to 5 parts of polycaprolactone, 10 to 30 parts of polyhydroxyalkanoate and 1 to 3 parts of plasticizer, wherein the modified coffee grounds are obtained by modifying coffee grounds raw materials with a mixed solution containing water-soluble polyester and a coupling agent. According to the method, high-value utilization of the waste coffee grounds can be achieved, environment protection is facilitated, meanwhile, the cost of consumables is greatly reduced, and remarkable social benefits and economic benefits are achieved; and in addition, the composite 3D printing material containing the coffee grounds can well meet the functional requirements of daily 3D printing, the comprehensive performance of printed products is excellent, and the application range is wide.

Description

technical field [0001] The invention relates to the technical field of additive manufacturing, in particular to a composite 3D printing material containing coffee grounds and its preparation method and application. Background technique [0002] Coffee is a drink made from roasted and ground coffee beans, and it is the main drink popular in the world along with cocoa and tea. The world consumes at least 400 billion cups of coffee every year. If a cup of freshly ground coffee of 350 ml produces about 20 grams of coffee grounds, it will produce 8 million tons of coffee grounds a year; taking a bag of rice of 25 kg as an example, The world produces at least 320 million bags of waste coffee grounds a year. At present, most of the coffee grounds in the world are discarded, landfilled or incinerated together with other wastes. This cost-increasing treatment method will not only produce more greenhouse gases such as carbon dioxide and nitric oxide, but will also be The combustion ...

AI Technical Summary

Problems solved by technology

In addition, the melt index, impurities, and crystallization points of the material may cause the material to be unable to print. Therefore, when there are other solid particles such as wood, coffee grounds, copper powder, and aluminum powder in the 3D composite printing material, uniform dispersion is the most critical and difficult. One of the problems to be solved; if the above solid particles cannot be dispersed evenly to form an agglomeration reaction, the agglomeration position of the solid material will form the following similar situations: A) Exceeding the wire diameter tolerance, printing failure due to jamming; B) Agglomeration will form Similar "impurities" make it impossible to pass through the 0.4mm nozzle, causing the nozzle to be clogged and printing to fail

Therefore, if various wood powders, coffee powders, aluminum powders, etc. cannot be effectively modified, there may be hollow and swelling inside the 3D printing filament during the extrusion process, which will seriously affect the material. performance and printing performance

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