1. Dielectric resistance
Air, water, oil, acid and other collectively referred to as a quality, the vast majority of adhesives have good resistance to air media, and the bonding strength of the bonded parts in the air is high. However, in different nature of gas or injection dissolving medium, the adhesive force is very different, and even the individual substances that are connected with the working process are mainly air, water, oil and acid. When using adhesives, choose a adhesive that is resistant to the use of media.
2. Bonding strength: Gooseneck tube, metal hose, lamp hose
For each 1cm2 bonding surface, the destructive force in the normal temperature and air medium is called the bonding strength, which is expressed in MPa. The bonding strength is divided into tensile strength, shear strength, torsional shear strength and peel strength length, and the private detective refers to the failure strength of the adhesive in different stress directions. The selection of adhesives should be based on the location and stress of the mechanical parts to choose the appropriate strength adhesive.
3. Temperature resistance
Refers to the temperature range that the fully cured adhesive layer can withstand, such as a temperature resistance of -60oC - 120oC, that is, the adhesive can be applied in the range of -60oC to 120oC, beyond this limit, the adhesive force decreases significantly. Air-cooled engine in construction machinery, the body temperature can reach 130oC. The temperature of the hydraulic oil can reach 120oC, and the adhesive must be selected within the temperature range that the adhesive can withstand.
4. Curing time
Curing time refers to the time required for the adhesive to change into solid glue at room temperature. Curing time can be divided into initial solid (or fixed) time and full solid time. Initial consolidation refers to the time required for the adhesive layer to withstand the adhesive piece without falling off due to its own weight; Full solid refers to the time required for the adhesive layer to be completely cured and achieve high adhesion strength and medium resistance. Adhesives can be divided into two kinds according to the initial setting time: quick drying adhesive (or fast drying adhesive) and slow drying adhesive. The initial setting time of the quick-drying glue is only a few seconds or tens of seconds. If the magnetic pump needs to shorten the curing time of slow drying glue, it can be heated by heat blowing, oven baking and other measures, but the heating temperature and time should be determined according to different kinds of glue. Select quick drying or slow drying adhesive, and the plug valve depends on the different conditions and working needs of the adhesive parts. Generally speaking, the bond strength and dielectric resistance of slow drying adhesive are better than that of quick drying adhesive.
