Core mold material for forming rocket engine grain and preparation method of core mold material

Abstract

The invention relates to the field of conductive plastics, in particular to a core mold material for forming a rocket engine grain and a preparation method of the core mold material. The core mold material is comprises, by weight: 100 parts of a plastic pellet material; 10-25 parts of a highly conductive filler; 5-15 parts of a reinforcing filler; 0.05-0.5 part of a coupling agent; 0.2-0.8 part of a solid lubricant; 1-5 parts of a plasticizer; and 0.2-0.8 part of an antioxidant. The efficient hyperbranched lubricant containing a large number of end groups and a three-dimensional spherical structure is introduced, and the filler can be uniformly dispersed only through one-time twin-screw granulation. Meanwhile, the surface smoothness of the conductive plastic can be improved, the demolding performance is improved, and subsequent extrusion molding and processing molding are facilitated. By adopting the technical means of compounding and using good matrix plastic to improve matrix modulus, loading high-conductivity fibers and filler to enhance conductivity, adjusting the filler type and dosage to improve strength and reduce linear expansion coefficient and the like, the problems of long processing period, high price, complex processing technology and the like of an alloy core mold to a certain extent are effectively solved.

Description

technical field [0001] The invention relates to the field of conductive plastics, in particular to a core mold material used for forming rocket engine grains and a preparation method thereof. Background technique [0002] The solid rocket motor propellant grain is mainly formed by wall-mounted pouring. First, the mandrel is fixed inside the engine, and then the propellant slurry is poured on the wall. After reaching a certain strength in 7 days, it is demoulded. The propellant grains are flammable and explosive hazardous chemicals. During the demoulding process, no static electricity can be accumulated between the mandrel and the propellant grains. Resistivity (resistance value ≤1.0×106Ω.m) range belongs to electrostatic conductor. [0003] At present, alloy materials are generally used as the core mold base material. In view of the increasing size of the engine, the shape and weight of the related core mold components also increase. Even if the relatively low-density hard...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the above-mentioned technical problems, the present invention provides a light-weight high-strength mandrel material for solid rocket motor charge molding and its preparation method, which uses good matrix plastic compounding to improve matrix modulus, load high-conductive fibers and fillers Technical measures such as enhancing electrical conductivity, adjusting filler type and amount, increasing strength and reducing linear expansion coefficient can effectively solve the problems of long processing cycle, high price and complicated processing technology in alloy core molds to meet the needs of future weapon models in batches and low cost. cost, high reliability development needs

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