Application fields and precautions of UV curing UV LED glue
Application area
Craft glass
● Bonding of glass products, glass furniture, electronic scales
● Crystal jewelry craft products, fixed inlay
● Bonding of transparent plastic craft products, PMMA/PS
Electronic appliances
● Painting and sealing of binding posts/relays/capacitors and micro switches
● Printed circuit board (PCB) paste surface components
● Bonding of integrated circuit blocks on printed circuit boards
● Fixing of coil wire terminal and bonding of parts
● The cable is covered and fixed to the interface or circuit board
Optical field
● Optical fiber bonding, optical fiber coating protection, repair connection
Digital disc
● In the manufacture of CD/CD-R/CD-RW, it is mainly used for coating of reflective film and protective film
● DVD substrate bonding, and the sealing cover used for DVD packaging also uses UV curing adhesive
medical supplies
● Adhesion of hypodermic needles to syringes, intravenous tubes, urinary catheters and medical filters
● Respiratory system, butterfly device and mask, venous catheter device, oxygenator, water reservoir, electronic diagnostic device and other medical equipment.
Other uses
● Micro motor: fixed, bonding and fixing of wire and circuit board
● Optical drive: fixed laser head, fixed lens, fixed circuit board
● Transfer: transfer glue, surface protective glue
● Bonding of automotive industry components: automotive lamp assembly, reversing mirror and air bag components bonding and fuel injection system
Precautions
1. Is there any relationship between the curing speed of the shadowless glue and the quality of the glue? SGS Quality Report of Shadowless Glue
The curing speed of shadowless glue, especially the positioning speed, has always been a data that consumers are more concerned about. There are many aspects to measure the quality of the shadowless glue: positioning time, curing depth, strength, and flexibility of the film are all aspects of assessing the quality of the shadowless glue. We believe that the faster the positioning speed, the greater the internal stress generated when the glue is cured. This may cause the aluminum plate to fall off. Generally, the positioning speed is 6 to 10 seconds. Therefore, it is wrong to judge the quality of the shadowless glue solely based on the curing speed.
2. Is the more sizing amount the better during bonding?
Shadowless glue is not the more sizing amount, the better. Experiments show that the thinner the adhesive layer, the higher the strength. Generally speaking, the thickness of the film should not exceed 0.2 microns.
3. Many consumers have found that the shadowless adhesive sometimes whitens when using the shadowless adhesive. How can the whitening phenomenon of the shadowless adhesive be quickly and accurately detected?
The whitening phenomenon of shadowless glue is a common problem, but because the whitening phenomenon is not serious and the film is relatively thin, it is generally difficult to find. This problem exists more or less in the glass-to-metal shadowless glue on the market. Take a glass plate, drop the glue on it, and then put it under the light for 12 minutes, then take it out and observe, so that the whitening phenomenon of the shadowless glue can be quickly detected. The degree of whitening is directly related to the thickness of the film. The degree of glue whitening has nothing to do with strength!
4. The viscosity of the shadowless glue?
When a liquid is moved by an external force, a measure of frictional resistance between its molecules is called viscosity. The greater the frictional resistance, the greater the viscosity; the smaller the frictional resistance, the lower the viscosity. In the International System of Units, the unit of viscosity is mPa.s. The viscosity of water is 1.14 mPa.s.
5. Does the lower the viscosity, the lower the strength?
There is no direct relationship between the viscosity and strength of the shadowless glue. If it is wrong to understand viscosity as strength, it is a misunderstanding.
6. What is the chemical composition of the shadowless glue?
Composed of oligomer, monomer, photoinitiator and auxiliary agent;
7. Performance characteristics of shadowless glue:
Fast curing and controllable reaction; solvent-free and pollution-free; suitable for automated operations; wide bonding range, high bonding strength, and wide application area; excellent optical performance; colorless and transparent colloid, after curing transparency rate "90%; weather resistance Excellent, no yellowing; curing principle and curing conditions of shadowless glue; photoinitiator (photosensitizer) in shadowless glue absorbs ultraviolet light under ultraviolet radiation to generate active free radicals or cations, and initiate monomer polymerization and crosslinking It reacts with the branching chemical to make the adhesive change from liquid to solid within a few seconds; the shadowless glue must be cured under ultraviolet radiation with a wavelength of 200nm~400nm;
8. What is the difference between shadowless glue and other glues?
The shadowless glue is initially set under ultraviolet light for 1-5 seconds, and the bonding can be completed in 20-30 seconds. After irradiation, it can reach a higher strength, which can meet the needs of the rhythm of the automated production line; the second-generation acrylic structural adhesive 1-10 The maximum strength can be reached within 24 hours after the initial curing; room temperature curing epoxy structural adhesives can be cured within 10 to 120 minutes, and the maximum strength can be reached within 7 hours.
