[특허]Heat protective material and method of making the material

Universal Propulsion Co. (Riverside CA 02)

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특허 상세정보

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Heat protective material and method of making the material

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	C04B-043/00
미국특허분류(USC)	252/62 ; 102/103 ; 102/105 ; 252/81
출원번호	US-0434960 (1974-01-21)
발명자 / 주소	Marion Frank A. (Riverside CA) McSpadden Hugh J. (Riverside CA)
출원인 / 주소	Universal Propulsion Co. (Riverside CA 02)
인용정보	피인용 횟수 : 20 인용 특허 : 0

초록
▼

This invention relates to materials having properties of withstanding temperatures in the thousands of degrees for extended periods of time without gross decomposition. The invention also relates to methods of producing such materials. The materials constituting this invention include binders and fillers mixed with the binders. The materials form a char when subjected to the elevated temperatures. The surface of the char glows in the luminous to incandescent range and rejects incoming heat by thermal radiation. The fillers have the properties of decomposing through a number of successive steps, each step advanced in temperature from the previous step by a relatively small amount. The gaseous products of such successive decompositions flow through the char, which is porous so as to provide transpirational heating. The resultant gases produced at the surface of the material provide a gaseous barrier to absorb heat and to transport heat away from the surface of the material.

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A method of producing a thermally protective material capable of providing heat insulation by withstanding elevated temperatures in the thousands of degrees for extended periods of time in the tens of hours without gross destruction including: mixing an epoxide and a filler material to form a first mixture, the filler material having properties of being chemically non-reactive at normally encountered ambient temperatures and having properties of chemically reacting in successive steps at progressive increments of temperature above the normally ambient temperature to provide a plurality of chemical products each resulting from an endothermal chemical reaction of previous chemical products where each successive endothermic chemical reaction in the chain occurs at an elevated temperature of small increment relative to the previous endOthermic chemical reaction in the chain, mixing a polysulfide and the filler materials and a curative for the epoxide to form a second mixture, and mixing the first and second mixtures to produce the thermally protective material, the epoxide having a range of 4 parts by weight to 1 part by weight of epoxide to 1 part to 4 parts by weight of polysulfide, the thermally protective material being initially non-porous and the thermally protective material providing transpirational cooling by the passage through a char of the gases produced from the filler materials, the thermally protective material having elastomeric properties to inhibit cracking of the thermally protective material during the formation of the char as a result of the subjection of the thermally protective material to the elevated temperatures, the binder being selected from a selected group consisting of mercapto-terminated polymers having the general formula HS(R－SS)nRSH where R is a polyvalent organic radical containing at least one methylene group and n is an integer of from about 3 to 100, and preferably from about 3 to 25 and the epoxy-terminated polymers having the general formula [Figure] where R′is the divalent organic radical of a dihydric alcohol or a dihydric phenol and n usually has a value of less than 1 to a value of about 20, the material selected for crosslinking the mercapto-terminated polymers and the epoxide-terminated polymers having a percentage by weight of approximately 15 parts to 100 parts by weight of epoxide-terminated polymers, the filler materials including phosphates and borates, the phosphates being selected from a group consisting of sodium and ammonium phosphate and the borates being selected from a group consisting of sodium and ammonium borate, the filler materials being uniformly dispersed in the binder in about 10 to 80 parts by weight of at least one of sodium or ammonium phosphate per 100 parts by weight of binder and from about 25 to 80 parts by weight of at least one of sodium or ammonium borate per 100 parts by weight of the binder. A thermally protective material capable of providing heat insulation by withstanding elevated temperatures as high as thousands of degrees Fahrenheit for extended periods of time as long as tens of hours without gross destruction, consisting essentially of: a binder having properties of forming a char when subjected to heat, and at least one filler material mixed with the binder and having properties of chemically reacting in successive steps to provide in sequence a plurality of chemical products each resulting from an endothermal chemical reaction of previous chemical products where each successive endothermic chemical reaction in the chain occurs at an elevated temperature of small increment relative to the previous endothermic chemical reaction in the chain, the filler material has properties of obtaining the production in the successive chemical reactions of gases which travel through the char to the surface of the thermally protective material to cooperate with the char in providing a surface reflective to the heat and wherein the filler materials have properties of obtaining the production in the successive chemical reactions of chemical products which decompose on an endothermal basis, the binder being selected from a group consisting of mercapto-terminated polymers and epoxy-terminated polymers, the mercapto-terminated polymers and epoxy-terminated polymers being cross-linked, the mercapto-terminated polymers having the general formula HS(R－SS)nRSH where R is a polyvalent organic radical containing at least one methylene gRoup and n is an integer of from about 3 to 100, and preferably from about 3 to 25 and the epoxy-terminated polymers having the general formula [Figure] where R′is the divalent organic radical of a dihydric alcohol or a dihydric phenol and n usually has a value of less than 1 to a value of about 20, a material selected from a group consisting of the aliphatic and aromatic primary, secondary and tertiary amines and having properties of serving as an agent for cross-linking the mercapto-terminated polymers and the epoxide-terminated polymers, the material selected for cross-linking the mercapto-terminated polymers and the epoxide-terminated polymers having a percentage by weight of approximately 15 parts to 100 parts by weight of the epoxide-terminated polymers, the filler materials being selected from a group consisting of phosphates and borates, the phosphates being selected from a group consisting of sodium and ammonium phosphate and the borates being selected from a group consisting of sodium and ammonium borate, the filler materials being uniformly dispersed in the binder in about 10 to 80 parts by weight of at least one of sodium or ammonium phosphate per 100 parts by weight of binder and from about 25 to 80 parts by weight of at least one of sodium or ammonium borate per 100 parts by weight of the binder.

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Heat protective material and method of making the material

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Heat protective material and method of making the material

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이 특허를 인용한 특허 피인용횟수: 20

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