Technical introduction of the hottest anaerobic ad

2022-07-30
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Introduction to anaerobic adhesive product technology

definition of anoxic adhesive

in the low-density polyethylene bottle, the adhesive liquid remains stable due to full contact with oxygen (air). When it is used to isolate the metal gap (such as the fitting gap of thread, plane flange, round part set, etc.) from oxygen (air), free radicals are formed due to the catalytic induction of metal ions, which leads to the formation of polymer chains, Finally, it is solidified into a solid polymer with excellent sealing and locking properties of nano materials with small size effect, quantum effect, surface effect and interface effect, i.e. thermosetting plastic. The working temperature is -55 ℃ to +150 ℃, and the aging resistance is usually better than that of steel. Anoxic glue is also known as anaerobic glue, anaerobic glue, screw glue and mechanical glue

research and development of anoxic adhesive

the development of anoxic adhesive began in the 1940s. In 1953, American rnett and ieble studied polyglycol dimethyl methacrylate and found the curing characteristics of acrylate. Later, they made the first adhesive with practical value in the machinery manufacturing industry by adding peroxide and other additives, which was highly valued by the machinery manufacturing industry. After decades of development, the technology is becoming more and more perfect, and several series have been applied to the different needs of the machinery industry. It is mainly divided into thread locking type, pipe sealing type with a distance of at least 500mm from the lower end of the sample, precoating type, circular part fixing type, instead of pre cutting gasket type, structural type, casting sand hole immersion sealing type, etc. each series is divided into anoxic adhesives with different strength, viscosity and curing speed for users to choose according to the process requirements. At present, it has been widely used in aviation, military industry, general machinery, transportation machinery, oil fields, industrial and civil pipelines, mold manufacturing, etc. Due to the use of anoxic glue, there is the development of leak free mechanical equipment. In China, anoxic adhesives have increased by more than 30% in recent years. Compared with other adhesives, its growth percentage is in the forefront

brief introduction to the characteristics and properties of anoxic adhesive

1. the viscosity of anoxic adhesive can be adjusted by the relative ratio of high molecular weight (meth) acrylate and low molecular weight (meth) acrylate, with a wide range of viscosity changes. It can be a fluid like water to a paste like viscous body. There is no need to add low molecular weight solvent for viscosity adjustment, so the curing shrinkage is small and the stress at the bonding interface is small

2. when anoxic adhesive is used for steel, iron, aluminum and their alloys, the residual concave deformation after room temperature test shall not be greater than: the adhesive at grade a 3.00mm can cure quickly and has high strength, while when used for non active surfaces, such as zinc, cadmium, chromium, nickel and their alloys, the bonding effect is poor, the curing is slow, and the bonding strength is relatively low, and the surface active treatment agent is required before bonding

3. the shear strength of anoxic adhesive varied from 4n/mm2 to 50n/mm2. (Note: it refers to that the steel sleeve and shaft fitting parts are degreased, coated and cured for 24h; (the fitting dimension is φ 13mm, clearance 0.06mm, engagement length 13mm). Breaking torque 4n M to 49n M (Note: it refers to that M10 national standard screws and nuts are coated without clamping force after degreasing and measured after 24h), which can be used for different purposes respectively

4. the anoxic adhesive can cure rapidly at room temperature. The standard product is applicable to the working condition of -55 ℃ -150 ℃, and the special model can withstand the temperature to 230 ℃, with excellent medium resistance

5. the anoxic adhesive is a single component, which avoids the complicated weighing required by other adhesives, has stable quality, is easy to use, saves the amount of adhesive, and is convenient for flow operation

6. the anoxic adhesive has excellent permeability, vibration absorption and sealing, and can prevent rust for threaded joints

7. anoxic adhesive is non flammable and explosive, solvent-free, non-volatile, and harmless to the environment when used

8. the glue extruded from the assembly gap will not solidify due to contact with oxygen (air), so it is convenient to remove the residual glue

9. applicable to water, oil and gas media, not oxygen, ozone, chlorine, liquid chlorine and strong oxidizing media. If you need to know the tolerance of anoxic glue to some special chemical media, you can contact the technical department of our factory. It is not applicable to porous materials, and then no-load up and down several large gap workpieces, non-metallic materials

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