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Title £ºPhysico-mechanical properties of Faceblank for Gas Mask

Abatract: This paper presents physico-mechanical properties of two faceblanks for gas masks. The results show that under the existing rubber formula and curing conditions, NR faceblank with a high self-inforceing possibility offer tensile strength of 22.0MPa and tearing strength of 41.3KN∙m-1, higher than the CIIR faceblank which are 13.2MPa and 35.5KN∙m-1, respectively. Resilience of the NR faceblank is 60%, much higher than the CIIR faceblank which is 60%. Poor resilience of CIIR faceblank is due to the great internal friction which is originated from the dense side methyl groups in the predominantly isobutylene units. After thermo-oxidative ageing at 100oC for 24 hours, both of the two rubbers increase approximately 2 drgree in shore hardness, and an increase of tensile strength, elogation and tearing strength of the NR faceblank was observed, the elogation and tearing strength of the CIIR faceblank had shown a decreasing trend by contrast. Curing changes the orginal structure of rubbers, and makes the impacts of ageing on the physico-mechanical properties more complicated.

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xpz-wdy: ½ð±Ò+20, ·­ÒëEPI+1, ¡ï¡ï¡ï¡ï¡ï×î¼Ñ´ð°¸, ·Ç³£¸Ðл£¬·Ç³£ÓÐÓà 2015-09-30 06:12:46
Abatract: This paper presents physico-mechanical properties of two faceblanks for gas masks. The results show that under the existing rubber formula and curing conditions, NR faceblank with a high self-inforceing possibility ¡¾offerS¡¿ tensile strength of 22.0MPa and tearing strength of 41.3KN∙m-1, higher than ¡¾those offered by¡¿ CIIR faceblank£¬ which are 13.2MPa and 35.5KN∙m-1, respectively¡¾Ô­¾ä±È½ÏµÄ¶ÔÏó´íÎó¡¿. Resilience of the NR faceblank ¡¾£¨60%£©¡¿ is much higher than ¡¾that of CIIR faceblank¡¿ which is 60% ¡¾±È½Ï¶ÔÏóÈÔÈ»´íλ¡¿. Poor resilience of CIIR faceblank is due to the great internal friction ¡¾which is¿ÉÒÔɾ³ý¡¿ originated from the dense side methyl groups in the ¡¾predominant¡¿ isobutylene units. After thermo-oxidative ageing at 100oC for 24 hours, both of the two rubbers increase approximately 2 ¡¾degree¡¿ in shore hardness, and an increase of tensile strength, ¡¾elongation¡¿ and tearing strength of the NR faceblank ¡¾is£¬Ê±Ì¬Ç°ºóÒ»Ö¡¿ observed, the ¡¾elongation¡¿ and tearing strength of the CIIR faceblank ¡¾haveʱ̬ǰºóÒ»Ö¡¿ shown a decreasing trend by contrast. Curing changes the ¡¾original¡¿ structure of rubbers, and makes the impacts of ageing on the physico-mechanical properties more complicated.
2Â¥2015-09-30 01:53:56
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