UV ( ultraviolet solidification glue ) basic knowledge

UV Curing Technology (UV Technology ), is considered to be a kind of green and environment-friendly technology, also known as the 3E technology, which is energy saving, environmental protection ( energy ) ( environment ), economic ( economy ), mainly used in coatings, inks, adhesives and other areas. Where UV plastic is widely used in glass products and jewelry industry, glass furniture, medical equipment, electronic, electrical, optical, optical instruments, manufacturing and other fields, such as electronic circuit boards, electronic components, digital cameras, electronic manufacturing, beep tablets and other products manufacturing.

1 what is the UV?

UV U ltra - Violet ray ultraviolet light is short, is the wavelength of the light in the 200-450nm, where UVA at wavelengths of 320-390mm; UVB at wavelengths of 280-320nm; UVC wavelengths below 280nm; UVV wavelength above 390nm.

2.UV curing light source

The 2.1 electrode type UV lamp ( Arc UV Lamp ) is cheap, the service life of the lamp tube short, UV light output ratio low;

The 2.2 electrode type UV lamp ( Electrode-less ) intensity and stability, lamp life of up to 3000h, 310nm, 365nm, 410nm generally produce, for 365nm high pressure, medium pressure mercury lamp;

2.3 type UV lamp bulb;

2.4 tube type UV lamp;

The 2.5 point light source UV lamp.

3.UV curing condition

3.1 UV illumination lamp, reflector and the output intensity of the design, the parameters for irradiation distance;

3.2 the amount of ultraviolet radiation UV illumination time = x

( MI / cm = 2 ) ( MW / cm 2 ) x ( s )

3.3 UV energy to determine the production efficiency and the curing temperature;

3.4 UV spectrum distribution : lamp type selection such as D lights, H lights;

4 UV gel composition: it is composed of oligomers, monomers, initiator, various additives;

5.UV curing principle

UV curable materials light initiator ( or photosensitizer ) under the irradiation of UV light after absorbing ultraviolet to produce reactive radical and cationic polymerization of monomers, initiator, cross-linking and grafting reaction, so that the binder in seconds to transformed from a liquid to a solid state;

6 UV performance characteristics:

6.1 fast curing, reaction control; solvent free, no pollution; suitable for automation operation;

The 6.2 bonding material widely, high bonding strength, but structural adhesive, applied range is wide;

The 6.3 optical performance; glue liquid colorless transparent, after curing light transmittance rate > 90%, a glue called;

6.4 excellent weatherability, non-yellowing;

The 6.5 disadvantage is the adherend must a translucent, curing need equipment can be cured;

7.UV gum and gum difference:

UV glue under the irradiation of UV 1-5S beginning of solid, 20-30S can finish adhesion after irradiation,  can reach a higher intensity, can meet the need of automatic production line of rhythm; the second generation acrylate structure adhesive 1-10min beginning of solid, 24h can achieve the highest intensity; room temperature curable epoxy resin structural adhesive 10-120min beginning of solid, 7d can achieve the highest intensity.