Fluoroelastomer compositions containing fluoroaliphatic sulfonamides as curing agents
申请人:MINNESOTA MINING AND MANUFACTURING COMPANY
公开号:EP0154460A2
公开(公告)日:1985-09-11
This invention relates to a method for vulcanizing. fluorocarbon elastomers and vulcanizing agents for use therein. In another aspect, the invention relates to vulcanizable fluorocarbon elastomer compositions containing vinylidene fluoride polymers and vulcanizing agent and adjuvants.
Although conventionally vulcanized fluorocarbon elastomers have many useful properties, they generally do not have sufficiently high tensile strength combined with sufficiently high elongation for certain applications. Such applications where high tensile strength, high elongation fiuorocar- bon elastomers would be especially useful include blowout preventers for oil wells, accumulator bladders, and diaphragms. Although increasing the cross-link density of cured elastomers will increase the tensile strength thereof, such an approach often adversely affects the elongation of the elastomer.
This invention relates to the achievement of high tensile strength accompanied by high elongation in cured fluorocarbon elastomers by using a novel vulcanizing, or curing, agent which does not adversely affect the other desired properties of the cured fluorocarbon elastomer. The curing agent is a fluoroaliphatic sulfonamide. A second curing agent selected from organic polyhydroxy compounds or ; polyamine compounds, or their derivatives, must also be ! employed when the fluoroaliphatic sulfonamide is monofunctional. The invention further involves a method for vulcanizing fluorocarbon elastomers.
The compositions of this invention can be used to prepare shaped articles that exhibit high tensile strength accompanied by high elongation.
本发明涉及一种硫化氟碳弹性体的方法及其所用的硫化剂。另一方面,本发明涉及可硫化的氟碳弹性体组合物,该组合物含有偏氟乙烯聚合物、硫化剂和辅助剂。
虽然传统的硫化氟碳弹性体具有许多有用的特性,但对于某些应用来说,它们通常不具备足够高的拉伸强度和足够高的伸长率。高拉伸强度、高伸长率的碳氟化合物弹性体特别有用的应用包括油井防喷器、蓄能器囊和隔膜。虽然增加固化弹性体的交联密度可以提高其拉伸强度,但这种方法往往会对弹性体的伸长率产生不利影响。
本发明涉及通过使用一种新型硫化剂或固化剂,在固化碳氟化合物弹性体中实现高拉伸强度和高伸长率,该固化剂不会对固化碳氟化合物弹性体的其他所需性能产生不利影响。固化剂为氟脂肪族磺酰胺。当脂肪族氟磺酰胺是单官能团时,还必须使用选自有机多羟基化合物或多胺化合物或其衍生物的第二种固化剂。本发明还涉及一种硫化碳氟化合物弹性体的方法。
本发明的组合物可用于制备具有高拉伸强度和高伸长率的成型制品。