18/8/2011
Để bổ sung cho những thiếu sót từ cao su thiên nhiên, cao su tổng hợp luôn được nghiên cứu mới và càng ngày càng có các nhóm được phát triển từ một loại cao su tổng hợp ban đầu.
Tuy các nhánh bổ sung hoặc được thay thế có vẻ đơn giản, nhưng lại mang các ứng dụng luôn bất ngờ và thú vị. Cao su tổng hợp Chlorobutyl cũng sẽ giải quyết được các khó khăn cho các nhà công nghệ không phải loay hoay mãi với một vài loại nguyên liệu cao su thường dùng.
Giới thiệu Lanxess không phải để làm quảng cáo mà rất hữu ích cho các kỹ sư cao su.
Lanxess Chlorobutyl
Lanxess halobutyl rubbers (Lanxess Bromobutyl and Lanxess Chlorobutyl)
are produced by reacting bromine, or chlorine, with butyl rubber in a
continuous process.
The halogenation of butyl rubber, with either chlorine or bromine, significantly increases cure reactivity, provides compatibility with unsaturated polymers, and enhances adhesion as compared to regular butyl rubber. Significant improvements in heat, ozone, flex fatigue resistance and compression set can be achieved through the selection of appropriate compounding ingredients and curing systems.
The versatility and properties of halobutyl rubber have led to significant growth in the use of butyl-type polymers in a diverse range of tire and non-tire applications.
Bromobutyl vs. Butyl and Chlorobutyl
Bromobutyl has two natural points of reference, namely: (1) butyl rubber, of which it is a modification, and (2) chlorobutyl, to which it is analogous. In each case, bromobutyl can be said to have several properties in common and to offer several advantages of varying degree.
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| Bánh xe cao su rất đa dạng |
Many of the properties of halobutyl vulcanizates are virtually identical, regardless of the halogen employed. With bromine, however, the cure sites in the polymer chain are more reactive, resulting in faster cures and better adhesion to unsaturated rubbers.
Because of the faster cure rate of bromobutyl, direct substitution of bromobutyl in chlorobutyl compounds frequently results in reduced scorch times which, in some cases, result in unacceptable factory processing. In these cases, satisfactory processing is readily achieved by adjusting curative types and/or levels.
Key
Properties
- high impermeability
- cure versatility
- faster cure rate
- cure compatibility
- good adhesion
- better heat resistance
- high impermeability
- cure versatility
- faster cure rate
- cure compatibility
- good adhesion
- better heat resistance
