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Plasma cleaning equipment manufacturers explain to you: the factors that affect the adhesive strength of adhesives

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24 Aug,2021

Plasma cleaning equipment manufacturers explain to you: the factors that affect the adhesive strength of adhesives
         The size of the bonding strength is related to the composition of the adhesive, the structure and properties of the adhesive, the performance of the adherend, the surface condition and the operation mode during use. Adhesive strength refers to the adhesive strength on the unit bonding surface. The bonding strength mainly includes the cohesive strength of the adhesive layer and the adhesive strength between the adhesive layer and the bonded surface. The plasma cleaning equipment manufacturer will explain to you below. Factors that affect the adhesive strength of the adhesive.Composition composite coating (refers to a sprayed layer composed of two or more different materials. The material composition of the composite coating changes stepwise in the thickness direction of the composite coating. It is called a stepped composite coating. Plasma cleaning equipment is used and various surface treatment technologies are used. Combined application to improve the protective ability of the coating to the substrate) After the bonding material and curing agent are determined, the cold welding bonding strength is mainly related to the powder addition amount, curing agent addition amount, and toughening agent addition amount in its components. In addition, , The construction process and the substrate material, surface roughness and cleanliness also have a greater impact on the cold welding bond strength.

Plasma cleaning (1) The influence of the amount of powder added
Appropriate addition of powder fillers can reduce the shrinkage of the coating and eliminate internal defects, thus improving the bonding strength of the coating. However, the increase in the amount of powder will reduce the adhesive material in the coating and reduce the bonding strength.
(2) The influence of the amount of curing agent added
Insufficient curing agent is added, and curing is incomplete; if the curing agent is added too much, the brittleness of the coating will increase, and the residual curing agent will reduce the performance of the coating. Therefore, it is necessary to accurately calculate the amount of curing agent when developing cold welding composite materials. The curing agent has been prepared in proportion when the composite coating is sold. The user can calculate and weigh and add according to the proportion specified in the product manual, without the need for tedious calculations.
(3) The influence of other factors
Appropriate addition of coupling agents can improve the bonding strength; the addition of defoamers, anti-aging agents, and accelerators can only reduce the bonding strength, so the use must be strictly controlled. In addition, a certain degree of roughness and necessary cleanliness on the surface of the workpiece can improve the bonding strength; on the contrary, the surface with oil stains and rust will seriously reduce the bonding strength and even cause failure.
Therefore, in order to improve the bonding strength, the following points must be paid attention to.
① The rough surface has a larger actual bonding area, which is beneficial to improve the bonding strength. Therefore, the bonding surface is better processed into a tooth-shaped surface.
② The proportion of the curing agent of the adhesive must be accurate, that is, it must be strictly weighed according to the proportion specified in the product manual. Too much or too little will affect the bonding strength.
③ The two components of the adhesive A and B must be mixed thoroughly, and the colors should be consistent.
④ The surface of the base metal must be as clean as possible, and there must be no oil stains and rust stains.
⑤ The ambient temperature during construction is better than 10°C, and the construction is not suitable if the ambient temperature is below 5°C.
⑥ During construction, the bottom layer must be repeatedly scraped to make the adhesive and the surface of the substrate fully wetted.
⑦ The curing reaction of industrial adhesives is relatively slow at room temperature. In order to improve the bonding strength and accelerate the curing reaction, the curing temperature can be increased. If possible, the curing can be used at 60~80~C, and the coating can be completely cured in 4~6 hours. The bonding strength between the cured coating and the substrate is gradually improved, and the bonding strength often continues to increase after being put into use.
Chengfeng Zhizao plasma cleaning equipment manufacturers focus on plasma technology research and development and manufacturing. If you want to have a more detailed understanding of the equipment or have questions about the use of the equipment, please click on the Chengfeng Zhizao online customer service. Chengfeng Zhizao is waiting for your call!

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