Three major challenges of UV light curing adhesives

In terms of UV curing technology, improving the UV curing conversion rate of functional groups and monomers, reducing the volume shrinkage rate of curing, is particularly important for improving the performance of UV adhesive and extending the application performance.

The volume contraction of free radical UV glue is generally greater than 5%, the volume contraction of cationic UV glue can be very small, but the decomposition of photoacid agent has an impact on some applications, and the raw material varieties are limited, leading to the limited application of cationic UV glue.

Two, UV resin based on natural products and biomass, high polymer quality low viscosity UV resin, high refractive index UV raw materials.

UV resin is usually molecular weight in the following ten thousand oligomer, polymer mass of resin viscosity, the need for diluent to reduce the viscosity, but the polymer mass of resin, even with less functional groups can also be fast curing, oxygen resistance polymerization is not obvious, volume shrinkage, very suitable for high-performance UV-PSA; With high polymer quality, low viscosity UV curing resin can be developed with good weather resistance, strong adhesion and stability of UV building adhesive, can be used for new safety glass, energy-saving glass, there is a huge application market.

At present, there is no mature preparation method of UV curing resin with high polymer quality and low viscosity. UV curable materials with high refractive index are key materials for high power LED packaging and sapphire optical device bonding. Usually, the refractive index of organic materials is below 1.6, and the high refractive index materials usually have color and poor heat resistance; It is necessary to adopt organic-inorganic nanocomposite to obtain materials with light color, refractive index higher than 1.7 and good heat resistance. Several laboratory methods for preparing materials with high refractive index can be found.

High barrier UV adhesive, UV curing different guide electroadhesive (UV-ACF), high water resistance "no shade adhesive", high strength UV composite adhesive, UV medical adhesive and other new products and technologies are to be developed.

(Structure and conductive mechanism of ACF)

"Shadowless adhesive" is widely used in the bonding and manufacturing of glass, clocks and handicrafts, which greatly simplifies the production process of these products. However, the current "shadowless adhesive" is not water-resistant enough, for example, it can not be used for the bonding or edge sealing of glass products such as fish tank. For a polar glass substrate, polar functional groups are required to provide adhesion, but the polar functional groups are high hydrophilic, water resistance is insufficient. New technologies and special resins are needed to develop "shadowless adhesives" with high water resistance and high adhesion to glass.

Polyester film PET optical performance is good, high strength, blocking infrared PET anti-exposure film technology is also mature, if there is a high strength PET glue, can form a series of products, such as new building energy-saving safety glass, safety glass film, using UV curing production.

The adhesion of current anti-exposure film to glass is good, but it can not meet the requirements of long-term stability and water resistance of safety glass, and the existing UV-PSA glue has a large residual odor, so it is necessary to develop high-performance UV-PSA with new resin and new methods.

China has a huge manufacturing and product market, but at present advanced technology is mainly imported from outside, and the materials supporting advanced manufacturing are also imported. This situation is changing. Although China's adhesive enterprises into the scale of the few, but for many years by order manufacturing, imitation and change.