Abstract:
The basic principles of selecting adhesives in t...
The basic principles of selecting adhesives in the hose joint-adhesive has special functions and practical value, and is widely used in metal hose joints. There are more than 10,000 adhesives in the world suitable for different uses. Choose adhesives and need to be based on the following 4 indicators.
(1) Aggo -quality function
Air, water, oil, acid, etc. are collectively referred to as the quality. Most of the adhesives have the best anti -air medium function, and the adhesion of the adhesive parts in the air is the highest. The adhesion in different properties of gas or injection medium is very different, and even the mass of the angle in the process of work is air, water, oil and acid. When using a adhesive, you should choose a glue to resist the medium.
(2) Adhesive strength
Each 1cm2 adhesive surface, the destructive power in the normal air -to -air medium is called the adhesive strength, which is represented by MPA. The adhesive strength is divided into stretching strength, shear strength, torsional shear strength and peeling strength, which refers to the destructive strength of the adhesive connection in different directions. When selecting adhesives, you should select the strength adapted to the strength of the mechanical parts and the stress eroticism.
(3) Temperature resistance
Refers to the temperature range of the glue layer that is completely solidified, such as a temperature-resistant-60OC-120OC, that is, the adhesion can be used in the range of -60OC to 120OC, which exceeds this limit and the adhesion is significantly reduced. The wind and cold thought in construction machinery, the body temperature can reach 130OC. The hydraulic oil temperature can reach 120OC, and when selecting adhesive, it must be within the temperature range that the adhesive can withstand.
(4) Cixed -time time
The curing time can be divided into primary fixation (or fixed) time and full fixing time. It refers to the time required for the adhesive to transform into a solid rubber house at room temperature at normal temperature. Chuku refers to the time required for the adhesive part of the adhesive part of the adhesive part of the adhesive part of the adhesion; the fully solid refers to the time that the glue layer is completely solidified and the best time to achieve the highest adhesion intensity and the function of the agglomeration resistance. The adhesive can be divided into two types: first -sized dry gum (or fast dry glue) and slow gum. The first fixing time of instant gels is only a few seconds or tens of seconds. If you need to shorten the solidifying time for slow drying, you can use thermal blowing and oven baking measures, but the heating temperature and time should be determined according to different glue species. Choose a instantaneous or slow gum, depending on the different situations and work needs of the adhesive parts. Generally speaking, the adhesion strength and anti -agglometer function of slow dry glue are better than that of instantaneous gum.
The above points are the basic principles of selecting adhesives in metal hose joints. Only by accurate adhesives can the expected effect be achieved and the use of metal hoses can be restored.
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