Grouting material and preparation method thereof

Abstract

The invention discloses a grouting material and a preparation method thereof. The grouting material comprises the following raw materials by weight: 100 parts of hydroxyl terminated polybutadiene, 0.45 part of a cross-linking agent, 30 parts of filler, 0.1-0.5 part of a catalyst and a curing agent. The preparation method includes: firstly sieving filler, taking the siftage and performing drying; then mixing hydroxyl terminated polybutadiene and the cross-linking agent evenly, adding the curing agent, the filler and the catalyst in order, and mixing the substances evenly after each adding; and finally conducting vacuum pumping treatment, thus obtaining the grouting material. The grouting material provided by the invention has good body, bonding performance and technological properties, and can repair the defect space of solid rocket engine charge combustion chamber third interfacial debonding. The system of the grouting material is consistent with the lining and grain, has good compatibility, can improve the aging performance and prolong the service life, has good fluidity, and can realize room temperature curing.

Description

technical field [0001] The invention belongs to the technical field of solid rocket motor manufacturing, and in particular relates to a grouting material. Background technique [0002] The bonding interface structure of the charge combustion chamber of the solid rocket motor is the shell and the heat insulating layer, the heat insulating layer and the liner, the liner and the grain, and the third interface is between the liner and the grain. At present, the engine charge generally adopts the composite solid propellant formula based on butadiene rubber. Practice has shown that the debonding of the third interface will cause the burning surface of the engine grain to increase instantaneously, the working pressure will increase sharply, and in severe cases, an explosion will occur, resulting in the failure of the test. Research on grouting repair technology has been carried out both at home and abroad. The existing grouting materials use epoxy resin / polysulfide rubber system....

AI Technical Summary

Problems solved by technology

The existing grouting materials use epoxy resin / polysulfide rubber system. This type of material uses epoxy resin and polysulfide rubber as the base material. The mechanical properties of the body (tensile strength, elongation), oxyacetylene ablation rate and The bonding performance with the interface (tear-off strength, shear strength) is low, and there are problems of poor fluidity and uncontrollable curing time at room temperature