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UV curing UV adhesive, referred to as UV technology, is considered as an environmentally friendly green technology, also known as 3E technology, namely energy, environment, economy, and is mainly used in coatings, inks, and adhesives. And other fields.

UV curing UV glue

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UV-curable UV glue, referred to as UV technology, is considered an environmentally friendly

1. What is UV?

UV is the abbreviation of Ultra-Violet ray, which is the light with a wavelength of 200-450nm.

1,

Radiation device for UV curing UV glue curing

Since 1960, UV-curable adhesives were reported abroad, and a lot of research has been done on them. And made remarkable achievements. Today UV glue has been successfully applied in many industrial assembly fields, especially in high-tech industries that require rapid assembly, such as LCD manufacturing, camera and other optical product manufacturing, optical disc manufacturing (CD, VCD, DVD, DVD-R), Manufacture of electronic components for the optoelectronic information industry such as watch manufacturing, buzzer, assembly of mobile phone keys, manufacture of electronic circuit boards, manufacture of polarizing components. In the field of daily necessities, such as the manufacture of glass furniture, the assembly of glass crafts, the assembly of toys, jewelry and other decorations, UV glue is also commonly used. Even traditional industries are using UV glue for assembly, such as the assembly of magneto-electric machines. Get fast and efficient production efficiency.

With the continuous research and advancement of scientific and technological personnel, some shortcomings of UV glue have been overcome, and the application field has been expanded. For example, the application of a new type of photoinitiator can extend the curing wavelength to visible light and can be cured with visible light. The application of a high-efficiency photoinitiator can be used for the bonding of colored or filler-containing systems. Bonding between substrates. For another example, a combination of UV curing technology, anaerobic curing, and thermal curing technology is used to produce a dual-cured product. It can not only photo-cure light-transmissive parts, but also anaerobic or heat-curable non-light-transmissive parts.

Tables 2 and 3 list the applications of UV-curable adhesives in Europe, which involve medical, glass, automotive, electrical, electronics, and optoelectronics.

Table 2 European UV adhesive market by category (tons)

Types of	Dosage (2000)	Dosage (2005)
Structural adhesive	175	696
Non-structural adhesive	4675	7430
total	4850	8126

Table 3 Market Situation of UV-curable Structural Adhesives in Europe, 2000-2005 (Tons, Annual Growth Rate%)

use	Dosage (2000)	Dosage (2005)	growth rate(%)
Electrical / Electronic / Automotive	45	70	9.2
Medical	20	26	5.4
glass	20	25	4.6
Optoelectronics	90	575	45.0
total	175	696	.

The following are some of the main application areas of UV glue:

1. Application in medical supplies

Disposable products have become one of the driving forces for the increase in the amount of UV curing adhesives. The technology extends to the bonding of hypodermic needles to syringes and intravenous tubes, and the use of urinary catheters and medical filters. The annual consumption of UV adhesives in this field in Europe is estimated at 20 tons, with an annual growth rate of 5.4%.

2. Application in glass and crafts, jewelry industry

The use of UV-curable adhesives has seen a good growth in several other areas. Retail store kitchen windows and decoration, building applications including stained glass, and more importantly, safety glass applications. The traditional process is to use polyvinyl butyral for bonding. Two pieces of glass coated with this adhesive need to be stacked and rolled in a hot press at a temperature of 130 ° C and a pressure of 1.3 MPa for a certain period of time. The total production time of this safety glass is about 20 hours. With UV curing adhesives, the bonding process can be completed in seconds or minutes. This greatly shortens the production cycle, saves energy and improves economic efficiency. In the jewelry and decoration industry, it can quickly complete the setting and positioning of gems and crystals. Glass furniture is also an important application area, although it is greatly influenced by fashion.

3.Application in the electrical and electronic industries

The development of UV-curable adhesives is the fastest in electrical and electronic applications. The total annual growth rate of the two is an average of 9.2%. The estimated usage has increased from 45 tons in 2000 to 70 tons in 2005. The main uses include:

Adhesion and sealing of smart card and conductive polymer display;

Painting and sealing of terminals, relays, capacitors and micro switches;

The surface components of the printed circuit board (PCB) are pasted;

Bonding of integrated circuit blocks on printed circuit boards;

The coil wire terminal is fixed and the parts are bonded.

Similarly, the bonding of automotive industry components usually also belongs to this field, and its applications cover the bonding of automobile lamps, the bonding of mirrors and airbag components, and fuel injection systems.

4.Application in optoelectronics and information industry

Although the electrical, electronics and automotive industries are the fastest growing segments, the largest consumer is the optoelectronic information industry with huge potential, which mainly includes three consumer areas: digital optical disc manufacturing, optical fiber bonding and liquid crystal and polymer Display.

In the information age, the demand for optical discs as one of the most important information carriers is very alarming, and it is expected that it will explode in the next 5 years. Both now and in the future will be the largest application area of UV curing adhesives. In the manufacture of CD, CD-R, and CD-RW, it is mainly used for coating of reflective film layers and protective film layers. The larger amount is in the DVD manufacturing industry. There are two important points about DVD production: first, unlike its predecessor CD, its manufacturing relies on two polycarbonate films bonded together to form a basic disc; second, Instead of using dots, but with faces, the amount of use increases. In addition, the sealing cover for DVD packaging also uses UV curing adhesive.

The demand trend of DVD shows that the DVD market plus home theater has a very high growth rate. Considering the development of potential technologies such as multi-layer DVD, the market size used in this field will grow tremendously, reaching 575 tons in 2005, and the corresponding annual growth rate can reach 45%.

Optical fiber and conductive pump display are also one of the application areas. The United States has replaced copper wires with optical fiber to transmit signals, and China's development prospects are bright.

Liquid crystal and polymer displays are the continuation of LCD technology. The most promising flat panel display technology, liquid crystal display (LCD), is experiencing rapid development and has become a market hot spot. At present, liquid crystal displays are widely used in electronic devices. These devices include:

* Watch, calculator

*computer monitor

*TV screen

* Camera / Clock

* Tester reading dial

* Car electronics dashboard

* Personal Digital Assistant (PDA) display

UV-curable adhesives are used in the manufacture of liquid crystal displays as follows:

Temporary fixing of optoelectronic components;

Motherboard seal;

The port is sealed;

Metal lead terminal bonding;

flexible end cap;

bare chip mounting;

Anisotropic and film bonding, as well as FCOG cap coating.

China is the world s main producer of liquid crystal displays. Materials used still need to be imported in large quantities. UV curing adhesives for LCD assembly mainly use products from Japan and other countries, and are represented by Three Bond.

In the manufacture of computer hard disks, the working procedure for bonding the magnetic head to the flap is to add a small amount of glue to the tongue at the front end of the flap, and then place the magnetic head on the tongue to add glue to the center. Irradiate with a certain intensity of ultraviolet light for a few seconds to make the adhesive initially cured; then take it out from the automatic bonding machine, put it into the oven after processing and heat curing at the set temperature. It belongs to UV-thermal curing dual curing.

5.Non-structural UV curing adhesive

The output of non-structural adhesives is large. In 2000, about 4,000 tons were produced. The main types are pressure-sensitive adhesives and adhesives for cardboard and packaging. Four good UV-sensitive tapes and labels for the finished product market:

Medical tape and medical pressure-sensitive adhesive for repair;

Special engineering tapes, such as the automobile and pipeline industry;

Transparent movie film labels;

Function label.