In the UV adhesive curing process, the colloidal surface is often sticky after UV irradiation (not dry), this phenomenon we call oxygen resistance polymerization. UV adhesive oxygen resistance polymerization mostly occurs in the acrylic adhesive system, which is determined by the mechanism of free radical polymerization, on the one hand, you can start with the change of UV adhesive formula, on the one hand, you can improve the operating process and environment, replace the [UVLED curing equipment] to deal with.
Explain to you the principle of oxygen resistance when UV adhesive curing.
The details are as follows (as shown in the picture below) :
1. Oxygen reacts with the activated initiator to form a complex, which causes the photoinitiator to quench;
a. Addition of active free radicals to O2: R· + O2 → R─O─O· (peroxy free radicals);
R─CH2─C·XY + O2 → R─CH2─CXY─O─O·
b. Oxygen molecules can also oxidize free radicals that have been polymerized with monomers into peroxides, preventing the polymerization of monomers
Corresponding to the curing mechanism, Koinu UVLED curing machine provides several ways for you to try to weaken or eliminate the effect of oxygen inhibition:
1. Change the reaction mechanism
The photoinitiation system was improved and the phenomenon of surface oxygen inhibition was inhibited
2. Change the reaction rate:
a. Increase the initiator concentration or increase the light intensity;
b. Modified curing resin can be selected, and then monomer or group consuming oxygen can be added;
c. Adding one or more oxygen scavengers to the photocuring system can alleviate the effect of oxygen inhibition
2. Change the curing process
a. Inert gas protection law
b. Wax float method
c. Coating method
d. Strong light irradiation method
e. stepwise irradiation
Auvcure is a professional manufacturer of all kinds of UVLED point light source, [UVLED line light source], UVLED surface light source and [UV curing machine], and can provide solutions and customization according to the actual needs of customers. The company has Japanese production technology, products are exported to South Korea, Japan, the United States, Brazil and other places. Welcome friends from all walks of life exchange guidance. If you want to know more about [UV light fixed machine] relevant information, welcome to online consultation customer service or call the company’s service hotline for consultation, we will be happy to provide you with quality service! Some of the information/pictures in this article are from the Internet, only for the purpose of sharing new information in the industry, not for commercial use. If any rights are involved, please inform us immediately, and we will delete it immediately. Thank you.
