Polyether-based composite solid propellant 3D printing ink and preparation method thereof

Abstract

The invention relates to polyether-based composite solid propellant 3D printing ink and a preparation method thereof. The polyether-based composite solid propellant 3D printing ink can be UV-cured and comprises 10%-60% of polyether-based photosensitive resin, 1%-5% of a dispersing agent, 25%-70% of an oxidizing agent and 10%-20% of metal fuel. The polyether-based photosensitive resin comprises the following raw materials: 45%-80% of a hyperbranched polyether macromonomer, 0%-35% of a diluent, 10%-50% of a cross-linking agent, 5%-20% of a plasticizer and 1%-10% of a photoinitiator. The invention also provides a preparation method of the polyether-based composite solid propellant 3D printing ink, which comprises the following steps of: pouring ink into a trough of a 3D printer, setting printing parameters, and starting printing to obtain a polyether-based composite solid propellant sample. According to the invention, UV curing and 3D printing forming of the polyether-based composite solid propellant are realized.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing, and specifically provides a polyether-based composite solid propellant 3D printing ink, a preparation method thereof, and a DLP molding method. Background technique [0002] Modern military theory requires weapons and ammunition to be miniaturized and lightweight. Researchers hope to maintain or even increase the specific impulse and thrust of the propellant while reducing the volume and quality of the composite solid propellant. This requires increasing the composite solid propellant. Energy Density. Polyether-based adhesives contain a large number of polar ether bonds, have good compatibility with energetic plasticizers such as nitrate esters, and are not prone to electrostatic explosions. Polyether-based composite solid propellants have higher energy and specific impulse, and become One of the research and development directions of high-energy solid propellants. [0003] In ad...

AI Technical Summary

Problems solved by technology

However, compared with UV curing 3D printing technology, the polyether-based composite solid propellant that uses extrusion 3D printing has lower structural strength in the Z-axis direction and requires a longer subsequent thermal curing process, resulting in its own structure under gravity. susceptible to deformation under the influence of

In addition, the high viscosity of the propellant slurry restricts the diameter of the printing nozzle. The diameter of the extruded propellant strip is generally greater than 600 μm, and the precision of the obtained product is relatively low.

The UV curing 3D printing technology can control the printing resolution within 50 μm by adjusting the light intensity and irradiation area, which has extremely high precision and the ability to form complex structures; The column is deformed, but the preparation of polyether-based composite solid propellants by UV curing 3D printing technology has not been reported yet

[0005] The main reason is that UV curing 3D printing polyether-based composite solid propellant has the following difficulties: (1) Polyether macromonomer products suitable for UV curing 3D printing cannot meet the requirements of fast curing, and need to be specially designed and synthesized

(2) The polyether-based composite solid propellant has high filler content and high ink viscosity, which makes it difficult to achieve self-leveling in the process of UV curing 3D printing, which affects the 3D printing process; (3) metal fuel powder and The oxidant powder will reflect, scatter, absorb and other effects on the UV laser, which will affect the photocuring rate and photocuring depth of the ink.

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