The adhesive has special functions and is widely used in metal hose fittings. There are over 10,000 kinds of adhesives suitable for different USES in the world. The following four factors need to be considered comprehensively for choosing appropriate adhesives in metal hose fittings.
1. Dielectric resistance
As for air, water, oil, acid and other substances, most adhesives in Shanghai have the best anti-air medium performance and the adhesion strength of the adhesive parts in the air is the highest. However, the adhesion of different gases or disintegrating media is quite different, and the substances connected with the working process are mainly air, water, oil and acid. When using adhesive, should choose the adhesive that is resistant to use medium.
2. Bonding strength: gooseneck, metal hose, lamp hose
For each 1cm2 of the bonding surface, the destructive force in normal temperature and air medium is called bonding strength, which is represented by MPa. The adhesive strength can be divided into tensile strength, shear strength, torsional shear strength and peel strength. The choice of adhesive should be based on the mechanical parts position and the situation of the force of the selection of the appropriate strength of the adhesive.
3. Temperature resistance
Refers to the temperature range of the completely solidified rubber layer, such as a certain temperature tolerance of -60oc - 120oC, that is, the adhesive can be applied within the range of -60oc to 120oC. Beyond this limit, the adhesion decreases obviously. Engineering machinery in the air - cooled engine body temperature up to 130oC. The temperature of hydraulic oil reaches 120oC. When Shanghai private detective chooses adhesive, it must be within the temperature range that the adhesive can withstand.
4. Curing time
Curing time refers to the time required for the conversion of the adhesive into a solid one at room temperature. Curing time can be divided into initial solid (or fixed) time and total solid time. Initial fixation refers to the time required for the adhesive layer to withstand the failure of the adhesive parts to fall off due to gravity. Solid refers to the time required for the rubber layer to be completely solidified and achieve the highest viscosity and best dielectric resistance. The adhesive can be divided into two kinds: instant dry adhesive (or fast dry adhesive) and slow dry adhesive. The initial curing time of instant dry adhesive is only a few seconds or several seconds. If the magnetic pump needs to shorten the curing time of the slow-drying adhesive, it can be heated by means of thermal blowing and oven baking, but the heating temperature and time should be determined according to different types of adhesive. Choose instant or slow drying rubber, plug valve according to the different conditions and work requirements. In general, the adhesive strength and dielectric resistance of slow dry adhesive are superior to that of instant dry adhesive.
Above a few are the basic principle that chooses adhesive in metallic conduit fitting, only choose adhesive correctly, ability achieves prospective effect, restore the use performance of metallic conduit, raise the utilization rate of metallic conduit fitting thereby, raise economic efficiency.
Jiaxing Dalex Technology Co.,Ltd
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