Aircraft fuel tank sealant and preparation method thereof

A technology for aircraft fuel tanks and sealants, applied in the field of sealants, can solve problems such as poor adhesion, reduced adhesion of sealants to substrates, debonding failure of aircraft fuel tank sealants, etc., to achieve broad market application prospects and reduce swelling Effect

Active Publication Date: 2018-10-12
THE SECOND RES INST OF CIVIL AVIATION ADMINISTRATION OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, fluorine-containing polymers have poor adhesion, and the sealant's ability to bond to the substrate is reduced, resulting in debonding failure of the aircraft fuel tank sealant

Method used

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  • Aircraft fuel tank sealant and preparation method thereof
  • Aircraft fuel tank sealant and preparation method thereof
  • Aircraft fuel tank sealant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Preparation of fluorine-modified hollow glass microspheres:

[0029] (1) Pickling: Mix 30wt% hydrogen peroxide and concentrated sulfuric acid at a volume ratio of 7:3, add hollow glass microspheres to the mixed solution, filter and dry after ultrasonic cleaning for 30 minutes;

[0030] (2) Alkali washing: Mix 30%wt hydrogen peroxide, 25%wt ammonia water and water at a volume ratio of 1:1:5, add hollow glass microspheres to the mixed solution, ultrasonicate at 55±5°C for 60min, filter and dry ;

[0031] (3) Surface modification: Dissolve perfluoropolyether trimethoxysilane in 1%wt ethanol solution, adjust the pH value to 3.0, add 5g of hollow glass microspheres pretreated by acid washing and alkali washing, 50 °C ultrasonically stirred for 2 hours, filtered and dried to obtain fluorine-modified hollow glass microspheres.

Embodiment 2

[0033] Preparation of aircraft fuel tank sealant:

[0034] Get 100g of liquid polysulfide raw rubber, 0.5g of fluorine-modified hollow glass microspheres, 40g of calcium carbonate, 5g of fumed silica, 1g of octadecanoate, 20g of butyl benzyl phthalate and 5g of epoxy resin in Grind on the three-roll mill for 10 minutes as the base paste; take 100g of manganese dioxide, 20g of butyl benzyl phthalate, 5g of 1,3-biphenylguanidine and 10g of carbon black, and grind on the three-roll mill for 10 minutes As a vulcanized paste, a two-component sealant is obtained, and the two components are mixed and stirred evenly to obtain the sealant 1 during use.

Embodiment 3

[0036] Preparation of aircraft fuel tank sealant:

[0037] Take 100g of liquid polysulfide raw rubber, 1g of fluorine-modified hollow glass microspheres, 20g of calcium carbonate, 10g of fumed silica, 2g of octadecanoate, 15g of butyl benzyl phthalate and 8g of epoxy resin in three Grind on the roller mill for 5 minutes as base paste; get 100g of manganese dioxide, 10g of butyl benzyl phthalate, 10g of 1,3-biphenylguanidine and 15g of carbon black, grind for 5 minutes on the three-roll mill as vulcanization paste to obtain a two-component sealant, and to obtain the sealant 2 after mixing the two components evenly during use.

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Abstract

The invention discloses an aircraft fuel tank sealant. The aircraft fuel tank sealant is prepared from base paste and vulcanizing paste, wherein the base paste is prepared from the following components in parts by weight: 100 parts of liquid polysulfide rubber, 0.5-10 parts of fluorine-modified hollow glass microspheres, 20-50 parts of calcium carbonate, 1-10 parts of fumed silica, 0.5-5 parts ofsalt of octadecanoate, 1-10 parts of epoxy resin and 10-20 parts of butyl benzyl phthalate; the vulcanizing paste is prepared from the following components in parts by weight: 100 parts of manganese dioxide, 10-20 parts of butyl benzyl phthalate, 2-10 parts of 1,3-diphenylguanidine and 10-30 parts of carbon black, and the weight ratio of the base paste to the vulcanizing paste is 5-20:1. The aircraft fuel tank sealant is obtained from the base paste and the vulcanizing paste by uniform mixing in proportion. The aircraft fuel tank sealant has remarkable oleophobicity, can effectively resist aircraft fuel and has broad market application prospect, and aircraft oil leakage accidents caused by sealant volume shrinkage are reduced.

Description

technical field [0001] The invention belongs to the field of sealant, and relates to an aircraft fuel tank sealant and a preparation method thereof. Background technique [0002] Aeronautical materials are the basic guarantee for the continuous improvement and development of aircraft performance, among which the aircraft fuel tank sealant plays an important role. With the rapid development of the aviation industry, the performance requirements for aircraft fuel tank sealing materials are also getting higher and higher. [0003] At present, the commonly used aircraft fuel tank sealant is polysulfide sealant. In actual use and aircraft maintenance, it is found that because the molecular chain of polysulfide sealant contains a large number of -C-C bonds, and the vulcanization point is the -S-S- bond with a lower bond energy, only 246kJ / mol, it is very easy to be swollen by aviation kerosene , the network space of the sealant increases, and the small molecule plasticizer with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J181/04C09J163/00C09J11/04C09J11/06
CPCC08K2003/2262C08K2003/265C09J11/04C09J11/06C09J181/04C08L63/00C08K13/06C08K9/06C08K7/28C08K3/26C08K3/36C08K5/098C08K5/12C08K3/22C08K3/04
Inventor 叶李薇张东岳彭华乔张亚博夏祖西
Owner THE SECOND RES INST OF CIVIL AVIATION ADMINISTRATION OF CHINA
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