Résumé
The experiment method of "Liquid-vapor" permeation for nitro oxidizer's skin protective materials by the indicator of pH test paper is developed,and the method for cankerous testing and evalution roles are confirmed too.The result of the experiment shows that butyl rubber and halogenated butyl rubber have better protective performances for "liquid-vapor" permeation of nitro oxidizer,while fluorine rubber,polyethylene and polyterafluoroethylene have better cankerous protection capabilities.
Résumé
Objective To develop MFT-2S protective mask with dual canisters and big-eye-window and to improve the three-grade system of protective equipment,so as to solve the problems on protective mask in environment with gas of high concentration.Methods MFT-2S protective mask was derived from MFT-2,with the advantages of MFT-2.The fixation intensity was effectively guaranteed by installing two sets of joint components and stainless steel clamps in the lower part of mask bilaterally.The sealing component was installed in communication component.Each canister was fixed at one side respectively.The fogproof lenses were reinstalled and the length of canister was increased properly.Results The results showed that,compared with MFT-1 mask,the inspiration resistance of MFT-2S mask decreased by a half,its total weight became about 50% of MFT-1 mask,and the leakage coefficient of MFT-2S mask was 0.005 percent.Its antidim character was improved and MFT-2S mask had better protective performance than MFT-2 by twice.Conclusion According to the transformed protection indices,MFT-2S mask,with the advantages of being light,simplified and standardized,can take the place of MFT-1 mask.
Résumé
Objective To explore the method of permeability for skin protective materials of rocket propellant based on the design and make of sealing container. Methods The propellant mass permeated per minute and per square centimeter was calculated by testing the mass through the sample at the fixed time in the sealing container. Results The method of permeability for skin protective materials against rocket propellant was developed by the mass variation of propellant in the sealing container. The limits of 100?g /(cm2?min) was raised to assess if the material had the protection ability. In the meantime, the reliability of material protection behavior was improved. Conclusion The science of the method developed is confirmed by comparing the permeation performance of protection materials at home and abroad, and the method can be the basis to assess the ability of protection materials.