Method for producing imide group-containing polymer foam material

Abstract

The invention discloses a method for producing an imide group-containing polymer foam material. The method comprises the following steps: weighing ester group-containing propylene monomers, amide group-containing propylene monomers, polymerization initiators, foaming agents and cross-linking agents on a weight basis in a transparent glass container, well mixing, and performing polymerization in abox with a built-in ultraviolet light generator to obtain a viscous substance; pouring the viscous substance in a closed glass or metal mold, putting the closed mold in an aqueous solution till the viscous substance in the closed container becomes a transparent solid substance; putting the transparent solid substance in an oven, applying a pressure and adjusting the temperature to obtain the imide group-containing polymer foam material. Compared with the prior art, the foam material of the invention has a more uniform foam pore structure, greatly increased mechanical properties, and a greatlyreduced data dispersion coefficient of mechanical properties; the product has diversified forms. The material is directly and widely applicable to fields such as aeronautics and astronautics, launch vehicles, railway locomotives, ships, wind power generation blades, sports goods, etc.

Description

technical field [0001] The invention relates to a production method of a foam material, in particular to a method for producing a foam material containing an imide-based polymer. Background technique [0002] The polymethacrylimide foam material containing imide groups in the molecular structure has outstanding performance, and it is the foam material with the highest specific strength (strength / density) and specific modulus (modulus / density) in the world. With excellent high temperature resistance and dimensional stability, it is an ideal core material for manufacturing lightweight and high-strength composite sandwich structures. It is widely used in aerospace, launch vehicles, railway locomotives, ships, wind power blades, sporting goods and other fields. In the 20th century In the 1960s, polymethacrylimide foam was commercialized. [0003] The preparation of polymethacrylimide foam generally uses (meth)acrylonitrile, (meth)acrylic acid, and other ethylenically unsaturate...

AI Technical Summary

Problems solved by technology

The disadvantage is that the highly toxic and dangerous (meth)acrylonitrile is used as the main monomer during the preparation, and the harm to production personnel and the environment cannot be underestimated when using this method

Moreover, the form of the product is single, it can only be a block

CN101550215A Pulverizes the transparent block to produce foamable particles, which expands the application range of the product, but will destroy the mechanical properties of the transparent block to a certain extent, and then affect the mechanical properties of the foam material after the transparent block is foamed

It is difficult to control the reaction of the bulk polymerization reaction in water at a certain temperature to obtain a transparent block, the system is prone to local overheating, and the polymerization reaction is uneven, resulting in cracks and bursting in the final foam material, which has a bad impact on the performance of the foam material. , and prone to waste

In addition, pre-polymerization generally takes several days to obtain a transparent block. The viscosity of the liquid in a closed glass container is relatively low for a long time, and the degree of reaction is inconsistent. The generated polymer will fall to the bottom under the action of gravity, resulting in the final transparent block. The density of the polymer in the upper and lower parts of the body is inconsistent