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Ethylene-propylene-diene monomer(EPDM) rubber heat-insulating material with ceramifiable ablation carbon layer

A technology of EPDM rubber and thermal insulation materials, which is applied in the field of porcelainization, can solve the problems of mechanical erosion, reduce the ablation resistance and erosion resistance of EPDM thermal insulation materials, and fall off in flakes, so as to reduce the escape of combustibles. Out, improve the anti-ablation and erosion ability, reduce the effect of shedding

Active Publication Date: 2015-03-25
HUBEI INST OF AEROSPACE CHEMOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used EPDM insulation materials are mostly composed of organic fibers, flame retardants, tackifiers, plasticizers, reinforcing agents (mostly silica) and other functional additives. Under the action of high-temperature gas, the rubber-based Materials and organic fillers are more likely to be thermally cracked into a variety of small molecular gases to escape. At the same time, due to the high melting point of the reinforcing agent silica, it is difficult to melt to form a viscous liquid and bond the carbon layer and other solid particles, resulting in burning. Under the action of internal gas and external gas flow, the carbon layer formed by corrosion is prone to mechanical erosion and flake off, which reduces the ablation resistance and erosion resistance of EPDM insulation materials

Method used

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  • Ethylene-propylene-diene monomer(EPDM) rubber heat-insulating material with ceramifiable ablation carbon layer
  • Ethylene-propylene-diene monomer(EPDM) rubber heat-insulating material with ceramifiable ablation carbon layer
  • Ethylene-propylene-diene monomer(EPDM) rubber heat-insulating material with ceramifiable ablation carbon layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1 (comparative example)

[0041] (1) Raw material preparation: according to the proportioning ratio of embodiment 1 in table 1, raw material preparation.

[0042] (2) Mixing: according to EPDM thin pass 3 times → aramid PA → ZnO, SA → SiO 2 →LPO, SMOS→TR→APP, MoO 3 → RD, MMg → DCP → Thin-pass 10-pass sheet-out sequence to refine EPDM thermal insulation materials.

[0043] (3) Sample preparation: prepare a 2mm thick film for testing mechanics, density and smoke signal; prepare 5 ablation pieces of Ф30mm×10mm for testing ablation performance; vulcanization system: 160℃×30min.

[0044] (4) Performance test: Test the performance of the insulation material in accordance with the corresponding standards and specifications. See Table 2 and Table 3 for specific results.

[0045] Table 1 adds the embodiment formula of OMMT

[0046]

Embodiment 2- Embodiment 11

[0048] (1) Prepare materials: Prepare materials according to the proportioning of Example 2-Example 11 in Table 1.

[0049] (2) Mixing: according to EPDM thin pass 3 times → aramid PA → ZnO, SA → SiO 2 , OMMT→LPO, SMOS→TR→APP, MoO 3 → RD, MMg → DCP → Thin-pass 10-pass sheet-out sequence to refine EPDM thermal insulation materials.

[0050] (3) Sample preparation: prepare a 2mm thick film for testing mechanics, density and smoke signal; prepare 5 ablation pieces of Ф30mm×10mm for testing ablation performance; vulcanization system: 160℃×30min.

[0051] (4) Performance test: Test the performance of the insulation material in accordance with the corresponding standards and specifications. See Table 2 and Table 3 for specific results.

[0052] Table 2 Various performances of embodiment 1-embodiment 11

[0053]

[0054] Note: The ablation and carbon layer are all visual inspection, the same as Table 5 below.

[0055] It can be seen from the results and data in Table 2 that af...

Embodiment 12- Embodiment 16

[0062] (1) Raw material preparation: according to the proportioning preparation of embodiment 12-embodiment 16 in table 4.

[0063] (2) Mixing: according to EPDM thin pass 3 times → aramid PA → ZnO, SA → SiO 2 , Mica→LPO, SMOS→TR→APP→RD, MMg→DCP→Thin Pass 10-pass sequential refining of EPDM thermal insulation materials.

[0064] (3) Sample preparation: prepare a 2mm thick film for testing mechanics, density and smoke signal; prepare 5 ablation pieces of Ф30mm×10mm for testing ablation performance; vulcanization system: 160℃×30min.

[0065] (4) Performance test: Test the performance of the insulation material according to the corresponding standards and specifications. See Table 5 for the specific results.

[0066] Like OMMT, Mica is also a silicate substance, and its melting point is about 100°C lower than OMMT. From the result data in Table 5, it can be seen that Mica can also ceramize the carbonized layer of EPDM thermal insulation material, making it have a carbon layer t...

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PUM

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Abstract

The invention relates to an ethylene-propylene-diene monomer(EPDM) rubber heat-insulating material with a ceramifiable ablation carbon layer, which is composed of 100 of EPDM, 5-50 of strengthening agent, 5-15 of organic fiber, 8-15 of tackifying resin, 4-15 of plasticizer, 8-20 of fire retardant and 3-12 of other auxiliary agent. According to the invention, a low melting point silicate substance such as montmorillonite and mica powder is introduced in an EPDM heat-insulating material formula, by using the characteristics of meltable performance at high temperature, a viscous liquid is generated for bonding the cracked carburization zones through physical crosslinking effect, and thereby a large solid particle network structure is formed, capability of the carbon layer for resisting volatilization internal stress of pyrolysis gas and erosion external stress of gas flow can be enhanced, denudation and shedding of the carbon layer can be reduced, and performances of anti-ablation, anti-erosion and characteristic signal transmitance of the EPDM heat-insulating material can be effectively increased. The heat-insulating material can be used for inner heat insulation of an engine and also can be widely used for producing ceramifiable wire and cable compounds and other places which requires fireproofing flame retardation.

Description

technical field [0001] The invention relates to the porcelain-making technology of the ablation carbon layer of the EPDM heat insulation material, especially the porcelain-making method of the ablation carbon layer and its influence on the performance of the heat insulation material. Background technique [0002] EPDM rubber has the advantages of low density, good weather resistance, aging resistance, heat resistance, etc., and its density is 0.86g / cm 3 Left and right, it has a large filling coefficient, and has good compatibility with various propellants and shell composite materials, and is an ideal thermal insulation material in the engine shell. At present, the commonly used EPDM insulation materials are mostly composed of organic fibers, flame retardants, tackifiers, plasticizers, reinforcing agents (mostly silica) and other functional additives. Under the action of high-temperature gas, the rubber-based Materials and organic fillers are more likely to be thermally cra...

Claims

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Application Information

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IPC IPC(8): C08L23/16C08K13/06C08K9/04C08K3/36C08K3/34C08K3/22C08K5/09
CPCC08L23/16C08L2201/02C08L2203/202C08L2205/03C08L2205/16C08L61/06C08L45/00C08K13/06C08K9/04C08K3/36C08K3/346C08K3/34C08K2003/2296C08K5/09
Inventor 陈德宏何永祝凌玲朱学文何碧烟聂松
Owner HUBEI INST OF AEROSPACE CHEMOTECH
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