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Method for Makhng Rocket Propellant
| Content Provider | Semantic Scholar |
|---|---|
| Author | Spenade, Lawrence Hall, Cranford Homer J. |
| Copyright Year | 2017 |
| Abstract | This application is a continuation-in-part of U.S. ap plication Ser. No. 822,713, filed June 22, 1959, by Lawrence Spenadel et al. The present application is con cerned more particularly with the method for making a rocket propellant of the hybrid type. The present invention relates to a novel method for making cellular substances which are useful in rocket pro pellant systems. Specifically, it involves the use of com patible organic blowing agents in the preparation of Sponges that have substantially uniform cells. In one aspect of the invention the sponge is blown in such a manner that there is little, or no, air in the cells of the finished sponge. In another aspect of the invention, a Substantially gas-free organic blowing agent is employed which volatilizes at a temperature which is lower than, but close to, the temperature at which the sponge is cured. It is known in the art of hybrid rocket propellants that Sponges may be compounded with fuels and filled with liquid oxidizing agents and used to propel rocket devices. A rocket propulsion device as used herein is a rigid con tainer for matter and energy so arranged that a portion of the matter can absorb the energy in kinetic form and Subsequently eject it in a specified direction. The type of rocket to which the invention has particular application is that which is generally designated as a pure rocket, that is to say, a rocket in which the means producing the thrust does not make use of the surrounding atmosphere. The rocket is propelled by contacting the fuel or propellant in a combustion chamber with a suitable oxidizing agent which produces burning and therefore causes the release of energy at a high but controllable rate from the com bustion chamber. The solid bi-propellants normally used in rockets consist of solid fuel and solid oxidizing agents. While solid oxidizing agents are highly useful, they are usually less effective than liquid oxidizing agents because the latter, in most instances, permit attainment of higher specific impulses. It is an object of the present invention to provide a novel method for making sponges. Another object is to describe a method for preparing sponges that possess out standing physical properties in relationship to sponges made by other methods. Still another object of the inven tion is to prepare sponges which are practically air-free that can be suitably employed in rocket motors in which the presence of air presents a problem. In accordance with the present invention a blowing agent, which is compatible with the polymer used in the manufacture of the sponge, is added to the sponge mix and the resulting mixture is subjected to blowing conditions which usually involves heating the compounded polymer to an elevated temperature and maintaining said tempera ture until a suitable sponge is formed. It has been found that by selecting the appropriate blowing agent, it is possi ble not only to produce a sponge which has uniform cells, i.e. no large pockets, but also one which has improved physical properties, especially tensile strength. A strong, elastic propellant is quite desirable in pure rockets which employ solid chemical motors to propel them. The solid propellants in such rockets undergo especially severe stresses, e.g. pressures of 300-1500 p.s. i., while burning in the combustion chamber which may cause them to O |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://patentimages.storage.googleapis.com/5e/31/77/13bfc19e3399ec/US3398215.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Patent |
