Epoxy adhesives not only has excellent adhesion and mechanical properties, but also has good resistance and electrical insulation medium, and curing process because of its low rate of contraction in the size and stability, easy processing in shape, so in all fields have been widely . In recent years aerospace, aircraft manufacturing, electronics and precision machining and other high-tech industry is developing rapidly, most of the heat-resistant epoxy adhesive in the curing process of heating needs, making epoxy adhesive in many fields of application are limited, the The key is to achieve room temperature heat-resistant epoxy adhesive curing. The room temperature curing adhesive used in a save time, effort, the provincial industrial and energy-saving, easy to use and a series of advantages, not only can reduce the cost of adhesive, but can also simplify the process, particularly applicable to large parts of the maintenance of high-temperature materials and contraction The adhesive. Development can be cured at room temperature so the heat-resistant adhesive epoxy adhesive has become one of the important development.
In many areas of epoxy adhesive is widely used. In recent years, brass ball valve aerospace, aircraft manufacturing, electronics and precision machining of high-tech industries such as the rapid development of the heat-resistant adhesive of a higher demand. Such as: supersonic aircraft wing of the cellular structure of the external wing of friction with the air temperature can reach 260 ¡æ over some fighters in the engine control panel requested the use of printed circuit temperature of 280 ¡æ; many spacecraft components such as wire Connectors, wire foreskin also need to heat-resistant adhesive. However, most of the heat-resistant epoxy adhesive in the process brass ball valve of curing the need heating, which makes epoxy adhesive in many fields of application are limited, the key is to make heat-resistant epoxy adhesive to achieve room temperature curing. The so-called room temperature curing, that is liquid at room temperature for the epoxy curing agents and components mixed modulation, available at room temperature for a certain period of time gel, and not more than seven days in the time available to fully cured and the intensity Curing methods. The room temperature curing adhesive used in a save time, effort, the provincial industrial and energy-saving, easy to use and a series of advantages, not only can reduce the cost of adhesive, but can also simplify the process, particularly applicable to large parts of the maintenance of high-temperature materials and contraction The adhesive.
Second, room temperature curing heat-resistant epoxy adhesive on brass ball valve the status and progress
The beginning of the 20th century, since the 1990s, against heat-resistant epoxy adhesive and curing at room temperature in the two studies, have made a lot of progress. Russia's scientific research institutions such as the use of special silicone resins and bismaleimide modified epoxy resin and adhesive to the maximum temperature above 400 ¡æ to the success of the study. In recent years various uses of the structure at room temperature curing adhesive have also been reported that the United States alone a business publication in 1993 introduced to the world of two-component room temperature curing adhesive are nearly 2,000 kinds. But while both brass ball valve heat-resistant and can be cured at room temperature characteristics of these two kinds of epoxy adhesive even small. brass ball valve |
