Curable perfluoropolyether compositions and rubber or gel articles comprising the same
a technology of perfluoropolyether and composition, applied in the field of perfluoropolyether composition, can solve the problems of short acid resistance, achieve the effects of improving acid resistance, good heat resistance, oil resistance, and solvent resistan
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example 1
[0079] A composition was prepared by combining 100 pbw of a polymer having formula (10) (viscosity 5,600 cSt) with 1.5 pbw of fumed silica Aerosil R972 (Aerosil Co., Ltd.). There were further added 0.3 pbw of a 50% toluene solution of ethynyl cyclohexanol, 0.2 pbw of a toluene solution of chloroplatinic acid-vinylsiloxane complex (platinum metal concentration 0.5 wt %), and 3.3 pbw of a compound having formula (11), followed by mixing.
[0080] The composition was press molded at 150° C. for 10 minutes and post-cured at 150° C. for 50 minutes, forming a cured product, designated Rubber A. Physical properties of the cured product were measured according to JIS K6249. The results are shown in Table 1.
example 2
[0081] A composition was prepared by combining 100 pbw of a polymer having formula (12) (viscosity 7,500 cSt) with 4 pbw of Aerosil R976 (Aerosil Co., Ltd.). There were further added 0.3 pbw of a 50% toluene solution of ethynyl cyclohexanol, 0.2 pbw of a toluene solution of chloroplatinic acid-vinylsiloxane complex (platinum metal concentration 0.5 wt %), and 2.7 pbw of a compound having formula (13), followed by mixing.
[0082] The composition was press molded at 150° C. for 10 minutes and post-cured at 150° C. for 50 minutes, forming a cured product, designated Rubber B. Physical properties of the cured product were measured according to JIS K6249. The results are shown in Table 1.
example 3
[0093] A composition was prepared by combining 65 pbw of a polymer having formula (12) and 10 pbw of a polymer having formula (15) (viscosity 650 cSt) with 25 pbw of a polymer having formula (16), 0.15 pbw of a 50% toluene solution of ethynyl cyclohexanol, 0.015 pbw of an ethanol solution of chloroplatinic acid-vinylsiloxane complex (platinum metal concentration 3.0 wt %), and 14.2 pbw of a compound having formula (17), followed by mixing.
[0094] The composition was heated at 150° C. for one hour, forming a gel product, designated Gel A. The penetration of this gel was measured according to ASTM D-1403 using a ¼ cone. The results are shown in Table 2.
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