Basic knowledge of the hottest UV curable conducti

Basic knowledge of UV UV curable conductive adhesive

uninwell international summarizes the basic knowledge of UV UV curable conductive adhesive as follows according to the feedback of its products at customers and its own experience summary, for the reference of interested friends

UV curing adhesive is generally composed of liquid acrylic resin or modified acrylic resin, conductive particles, and some solid acrylic resin fillers. The function of filler is mainly to adjust the viscosity of adhesive and change the curing speed of adhesive. UV curing adhesive used for fixing metal terminals will also be added with some plasticizers to increase the strength after curing; Some will also add dyes to distinguish different product numbers

the chemical bond of the photosensitive group in the molecular branch chain of the UV curable conductive adhesive will open under the action of UV energy. After opening, the chemical bond of some photosensitive groups will recombine with the chemical bond of the photosensitive group opened by UV energy on the other side of the molecule, which can overcome the fact that part of the UV energy is no longer opened. In this way, after the chemical bonds of different molecules are recombined, the glue is linked into one, forming a solid long molecular chain macromolecule. These macromolecular compounds formed are not easy to be destroyed by other substances because of their strong chemical bond bonding force, so they can isolate different substances on both sides of the substance

1. Main parameters affecting the properties of UV curable conductive adhesive:

maximum particle size; Viscosity; UV intensity; Positive ion content; Molecular weight; Dielectric constant

2. Application scope:

uninwell International's UV UV curable conductive adhesive, photosensitive conductive adhesive, FPD photosensitive silver paste, FPD lithography paste, LCD conductive silver paste, PDP conductive silver have successful cases in LCM module, PFD (flat panel display), liquid crystal display (LCD), plasma display (PDP), electroluminescent display (ELD), organic electroluminescent display (OLED), field emission display (FED), projection display and other fields

3. Factory adaptive test method and judgment standard of UV curable conductive adhesive:

viscosity:

A. test method: test the viscosity of UV curable adhesive to be tested

b. judgment standard: the viscosity is within the parameters provided by the supplier and is similar to the viscosity of UV curing adhesive used in current production

dispensing performance:

a. test method: spot the UV curing adhesive to be tested according to the current production process conditions, and observe its dispensing effect

b, judgment standard: the glue dot is full, the size of the glue dot is equivalent to that of the UV used in current production, and the solidified glue used for measuring rubber, leather, etc., and the glue penetration rate is roughly the same as that of the current production

curing performance and reliability:

a. test method: cure the UV curing adhesive according to the current production process conditions

b, judgment standard: the curing is complete, and the cured product is boiled in water for four hours without cracking and liquid leakage of UV curing adhesive; After freezing at -40 ℃ for four hours, there is no cracking and liquid leakage of UV curing adhesive

reactivity with liquid crystal:

a. test method: make samples of the UV curing adhesive to be tested according to the production process conditions, and test its photoelectric properties

b, judgment standard: there is no domain extending towards the visible area near the UV curing adhesive. It has no effect on the photoelectric parameters of liquid crystal, and the photoelectric performance changes within the range of product requirements after high temperature and high humidity reliability

4. Usage of UV curable conductive adhesive:

the frozen UV curable conductive adhesive is best thawed in the same temperature environment as the operation site, and then the cover is opened for use. If there is residual adhesive in the container after use, it should be immediately covered and sealed to prevent the solvent in the adhesive from absorbing moisture and being polluted by other solvents

during dispensing, the viscosity of UV curable conductive adhesive will also increase with time, so it is necessary to adjust the glue loading amount of each syringe in time to keep the dispensing effect within the required range

the UV curable conductive adhesive should be cured in time after being spotted, and ensure that the UV curable adhesive has a stable initial hardness. And try to ensure complete curing

the heat shrinkage rate of UV curable conductive adhesive after curing should be close to that of glass with advanced technology

uncured UV curable conductive adhesive is not resistant to strong oxidants, so strong oxidizing atmosphere and oxidizing solvents should be avoided; After curing, it is not resistant to some organic solvents

5. Storage and handling methods of UV curable conductive adhesive:

· UV curable adhesive shall be stored in a closed, moisture-proof and shading environment at -5 ℃ ~5 ℃

· when handling, it is stipulated that the price of tube metal is higher than its marginal cost system according to the failure of identifying faulty chemicals. (end)