Method for forming resin fiber composite material by self-heating expansion pressure bag

Abstract

The invention discloses a method for molding a resin fiber composite from a spontaneous thermal-expansion pressure bag. The novel method is designed in order to overcome the defect of a conventional airbag molding process which is complex in manufacturing; according to the novel method, an expanded microsphere foaming agent is adopted for replacing an air source and a heat source is generated through reaction between quick lime and water, and meanwhile, the water is absorbed in the reaction of the quick lime and the water so as to avoid the influence of the water on resin curing. For a same product, the thermal-expansion process can be used for reducing product molding duration and can also be used for improving the compactness of the product. The adopted expanded microsphere foaming agent is high in foaming ratio, and is capable of generating sufficient pressure and maintaining pressure for a long time when foaming in an inner cavity; meanwhile, the expanded microsphere foaming agent is still in the form of powder, so that the foaming agent can be taken out of the inner cavity conveniently. The molding method disclosed by the invention is simple and easy to implement, wide in material source, low in cost and good in using effect.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a method for forming a resin fiber composite material with a self-heating expansion pressure bag. Background technique [0002] Resin fiber composite material refers to a new type of material that uses thermosetting resin as a binder and fiber as a reinforcement. The resin and fiber are bonded and cured to each other. The resin can be epoxy resin, unsaturated resin, polyester, etc. Resin, etc. The fiber can be glass fiber, carbon fiber, aramid fiber, etc. Generally, liquid resin is required to wet the fiber and then lay up the layer according to the desired shape. The general molding methods include: hand lay-up molding, built-in air bag molding, vacuum molding, etc. Pressure tank molding and other methods. [0003] The air bag molding method is a very important molding method of resin composite materials. It is mainly used to shape some high-strength hollow products, ...

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Problems solved by technology

[0003] The air bag molding method is a very important molding method of resin composite materials. It is mainly used to shape some high-strength hollow products, such as bicycle main beams, rackets, etc. The traditional molding process is to press prepregs in a certain layer The direction is pre-laid and formed, and then the air bag and the laid prepreg are put into the mold together, the mold is closed, and then hot air is injected, and the hot air pressure will make the prepreg stick to the mold and then solidify, demould, and trim , grinding, and surface treatment to obtain finished products. This molding method is subject to the complexity of the product. If the shape of the product is more complex, on the one hand, the difficulty of forming the air bag will increase. On the other hand, if the inner cavity is complex, the pressure of the air bag on the inner wall Equalizing air bag is easy to break and cause product defects

In addition, the traditional air bag forming method is that the heating sequence of the whole system is from outside to inside when the product is cured, that is, the heating situation is: mold-prepreg-air bag. The defect of this heating method is that the surface of the mold and the bag side The prepreg is cured first and the curing air cannot be discharged in time after the prepreg in the middle. This heat difference will lead to local voids or defects in the product

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