Five types of UV light curing adhesives

UV adhesives can be roughly divided into two categories: substrates (tape, double-sided tape) and no substrates (liquid glue).

UA Pressure Sensitive Adhesive (PSA) 

PSA is currently prepared through solution coating, drying and chemical reactions.

PSA is produced by UV curing method.

UV compound glue 

Food, beverages and some biomedical products require high-barrier flexible packaging, and the barrier properties of packaging materials determine and affect the edible time

At present, almost all composite adhesives in the flexible packaging industry are solvent-based adhesives.

During the festive period when the demand for exquisite packaging is strong and the delivery is urgent, many composite packaging films are delivered for use without fully reacting and completely evaporating clean solvents.

Replacing solvent-based adhesives with UV adhesives will not only greatly improve the production efficiency of the composite film, it can be completed in one minute from the original production process of several hours; UV adhesives do not contain solvents and are non-volatile , No harmful residues, and can ensure that the composite film meets the health and hygiene requirements of food, medicine and other packaging materials

Wait for the solvent to volatilize for several or even dozens of hours.

UA construction glue 

Safety glass is mainly made of polyvinyl butyral film as the bonding material, and the glass sheets are bonded through the process of vacuum degassing and hot pressing.
The total production time takes about more than ten hours
.
It has been a long time to produce laminated safety glass by using edge sealing, glue filling, and storage under natural light for tens of minutes to complete photopolymerization.
It has been a long time, but it is still a non-mainstream product and is mainly used in the low-end safety glass market
.

The main reasons that liquid bonding methods are not widely accepted are the insufficient performance of UV glue and the lack of reliable data on safety
.
The growth momentum of UV glue in the construction field is good.
Store kitchen windows and decoration, stained glass are all using UV glue
.
With the improvement of performance, UV construction glue will have a great development
.
In recent years, the application of PVC stone plastic flooring has been rapidly developed in China.
The construction method is to first scrape a layer of adhesive on the construction ground, and then glue the PVC floor
.

PVC plastic floor glue can be divided into three categories: water emulsion type, solvent type, and reactive type
.
The water emulsion adhesive uses water as the dispersion medium, and the product is non-toxic and low in cost
.
However, the water resistance is poor.
Generally, after soaking in water, the adhesive force is greatly reduced, such as water-based acrylate
.
Solvent-based adhesives are mainly polyvinyl acetate-based and neoprene-based adhesives
.
The reactive type has polyurethane series adhesives
.
This type of adhesive is required after application
.

UA electronic glue

UV adhesives have been widely used in the field of electronic products, including cable positioning, pin sealing, liquid crystal panel preparation, mobile phone keys, etc.
UV curing bonding is a technical means that must be used in the manufacture of electronic products
.
With the thinning of electronic products and the emergence of organic optoelectronic devices and flexible bendable display devices, there is a huge demand for UV adhesives that adapt to the roll-to-roll process
.
The high-efficiency, fast, timely, and controllability characteristics of UV curing will be fully demonstrated
.

UV optical glue

Touch screens are currently the largest single application of UV optical glue
.
The UV optical glue in the touch screen has three functions: bonding, increasing light transmission and improving impact resistance.
It needs to meet strict performance requirements, including color, weather resistance and environmental stability, electrical properties, and optical properties
.

The touch screen laminating adhesive materials involved are: glass, ITO conductive layer, PET, PMMA, PC and so on
.
When sapphire is used in the touch screen, a higher refractive index UV glue will be needed to improve the light transmittance
.
At present, there are liquid (LOCA) and solid (OCA) optical adhesives used for touch screens.
The former uses a program to control the dispenser to dispense, cover the glass cover, level and cure through the cover after filling, with good filling, It has the advantage of convenient sizing, but it needs to be cleaned up; OCA is a double-sided PSA without substrate, with release films on the top and bottom.
When using, first remove the light release film for bonding, and then remove the heavy release film and then combine it with The other bonding surface is attached
.

The liquid glue used in the earlier touch screens is thermally cured, which has a long production process and low efficiency.
Now it has all been converted to UV curing glue
.
The current OCA is still produced by traditional solvent-based adhesives through coating, drying, and thermal cross-linking processes.
The drying path is long and there are many defects caused by dust
.
Switching to UV curing process will greatly improve production efficiency, reduce equipment investment and production costs
.