In order to highlight or improve the performance of ACM, modifying ACM or using ACM to modify other elastomers has become one of the research hotspots in processing applications in recent years. The main ones are:
The first is acrylic thermoplastic elastomer (AC-TPE), which contains flexible acrylate segments as the elastic phase and is used to synthesize thermoplastic elastomers. At present, the plasticization of thermosetting ACM has become a competition. A hot development topic, AC-TPE has become an important product for high temperature and oil resistance in automobiles.
The second is the mixed modification between different types of ACM. ACM is divided into standard type (brittle temperature -12℃), cold-resistant type (-24℃) and super cold-resistant type (-35℃) according to its cold resistance. Different types of ACM, on the one hand, have different physical properties due to differences in their main chain structures; on the other hand, due to similar polarities, they have better compatibility and excellent vulcanization properties. The standard ACM has good heat resistance, oil resistance and physical properties, but poor low temperature resistance; while the super cold resistant type has good low temperature resistance, but poor oil resistance and poor physical properties of the rubber. The comprehensive performance of these two types of ACM*** compound compounds has been improved. Therefore, for applications requiring heat resistance, oil resistance and low temperature resistance, such as automobile oil cooling pipes, different types of ACM*** compound compounds have different characteristics. Its good comprehensive performance can meet its requirements.
The third is ACM/nitrile rubber (NBR) mixed modification. ACM and NBR are both heat-resistant and oil-resistant rubber. Through exclusive mixing and modification, the tensile properties and processing properties of ACM rubber can be improved and the cost can be reduced. Since the vulcanization mechanisms, vulcanizing agent types and dosages of these two rubbers are different, the main difficulty in creating a mixed rubber is that the vulcanization is not synchronized. The vulcanization speed of NBR is significantly faster than that of ACM, causing the accelerator in the ACM phase to migrate to the NBR phase. A lot of research has been done on this at home and abroad, and there are many patent reports.
The fourth is ACM/silicone rubber mixed modification. Silicone rubber has excellent high and low temperature resistance, but poor oil resistance. Mixing it with cold brittle and hot sticky ACM can significantly improve the heat resistance and cold resistance of ACM, and obtain high, low temperature and Balance between oil resistance. It is worth noting that ACM is a highly polar rubber, while silicone rubber is a weakly polar rubber. Therefore, it is necessary to find ways to solve the problems of poor compatibility and slow vulcanization speed of the mixed rubber. For example, the Japanese Synthetic Rubber Company’s ACM/silicone The rubber compound was modified to conduct research on miscibility and curing to develop an ideal compound (QA). The vulcanizing agent used in the QA compound was 1,4-bis-tert-butyl Cumene oxide, the vulcanizing agent is N, N-m-phenylene maleimide. This patented compound shows good comprehensive properties of oil resistance and high and low temperature resistance. It is a modified ACM product with the best performance/price ratio. It is applicable to as many as 12 types of components in automobile manufacturing.
The fifth is ACM/chloroether rubber (ECO) mixed. ECO and ACM have similar structures and good compatibility, and the cross-linking groups of these two rubbers are active chlorine and the vulcanization system is the same. After mixing, the physical properties of the rubber will not be reduced, and the heat resistance of ECO is not the same. It is inferior to ACM and has better tensile properties and cold resistance. ACM/ECO mixture can improve the cold resistance, water resistance, elasticity and tensile strength of ACM rubber. The vulcanization system uses zinc oxide, magnesium oxide and 2- Hydroxyimidazoline.
Sixth is ACM/fluorine rubber (FKM) mixed. FKM has excellent high temperature resistance and oil resistance and can be used for a long time at 250°C. However, its resistance to engine oil is not as good as ACM, and its cost is much higher than ACM. ACM/FCK compound can overcome their respective shortcomings. Domestic and foreign research on the use of fluorine rubber and ACM high-temperature rubber compound vulcanization can significantly improve the processing performance of fluorine rubber, reduce its production cost, and obtain new heat-resistant and oil-resistant rubber. Material.