UV resin is a low relative molecular mass photosensitive resin, with UV reactive groups, such as unsaturated double bonds or epoxy groups.
UV resin is the base resin of UV coatings, which is compounded with photoinitiators, active diluents and various additives to form UV coatings.
UV coatings have the following advantages:
(1) fast curing speed, high productivity;
(2) high energy utilization, energy saving;
(3) organic volatile organic compounds (VOCs), environmentally friendly;
(4) can be coated with a variety of substrates, such as paper, plastics, leather, metal, glass, ceramics, etc.;
UV resin is the base resin of UV coatings, it is compounded with photoinitiators, active diluents and various additives, which constitute UV coatings. >
UV resin is the largest proportion of UV coatings in the components, UV coatings in the matrix resin, generally with further reaction or polymerization in the light conditions of the groups, such as carbon carbon double bond, epoxy group. According to the different types of solvents, UV resins can be divided into solvent-based UV resins and water-based UV resins two categories. Solvent-based resins do not contain hydrophilic groups, can only be dissolved in organic solvents, while water-based resins contain more hydrophilic groups or hydrophilic chain, can be emulsified in water, dispersion or dissolution.
UV resin classification:
Solvent-based UV resin
Commonly used solvent-based UV resins include: UV unsaturated polyester, UV epoxy acrylate, UV urethane acrylate, UV polyester acrylate, UV polyether acrylate, UV acrylic resins, UV epoxy resins, UV silicone oligomer.
Waterborne UV resins
Waterborne UV resins are UV resins that are soluble in water or can be dispersed in water, and contain a certain number of strong hydrophilic groups in the molecule, such as carboxyl, hydroxyl, amino, ether, acylamino, etc., and unsaturated groups, such as acryloyl, methacryloyl or allyl. Water-based UV tree can be divided into emulsion type, water dispersion and water-soluble type three categories. Mainly includes three categories: waterborne polyurethane acrylate, waterborne epoxy acrylate and waterborne polyester acrylate.
The main application areas of UV resin: UV coatings, UV inks, UV adhesives, etc., of which UV coatings in the most applications, including the following types of UV waterborne coatings, UV powder coatings, UV leather coatings, UV fiber optic coatings, UV metal coatings, UV paper varnish coatings, UV plastic coatings, UV wood coatings
Shadowless adhesive, also known as UV adhesive, photosensitive adhesive, Ultraviolet light curing adhesive, shadowless adhesive is a class of adhesive that must be cured by ultraviolet light irradiation, it can be used as a bonding agent, but also as paints, coatings, inks, etc. UV is an abbreviation for Ultraviolet Rays in English, i.e., ultraviolet light. Ultraviolet (UV) is invisible to the naked eye, is a section of electromagnetic radiation other than visible light, wavelengths in the range of 10 ~ 400nm. Shadowless adhesive curing principle is UV curing materials in the photoinitiator (or photosensitizer) in the ultraviolet irradiation of ultraviolet light absorption of ultraviolet light to produce reactive radicals or cations, triggering the monomer polymerization, cross-linking and branching of the chemical reaction, so that the adhesive in a few seconds from the liquid state into a solid state.
Catalog main ingredients common applications product features advantages of shadowless adhesive:environment/safetyeconomics compatibility method of use principle of operation:operating instructions:disadvantages of shadowless adhesive:comparison with other adhesives application areas crafts, glassware electronic and electrical industry optical field digital optical disc manufacturing medical supplies other uses precautions to be taken to unfold
Main Ingredients pre-polymers: 30~ 50% acrylate monomer: 40~60% photoinitiator: 1~6%
Auxiliaries: 0.2~1%
Prepolymers: epoxy acrylate, urethane acrylate, polyether acrylate, polyester acrylate, acrylic resin, etc.
Monomers: mono-functional (IBOA, IBOMA, HEMA, etc.), difunctional (TPGDA, HDDA, HEMA, etc.). HDDA, DEGDA, NPGDA, etc.), trifunctional and multifunctional (TMPTA, PETA, etc.)
Initiators: 1173, 184, 907, benzophenone, etc.
Auxiliaries can be added or not, which can be used as a bonding agent, but also as paints, coatings, inks, and other adhesives. [1] Common applications Plastic and plastic, plastic and glass, plastic and metal and other materials bonding. Mainly for the craft industry plastic self-adhesive and mutual adhesion, furniture industry, such as coffee table glass and steel frame bonding, glass fish tank bonding, including PMMA acrylic (organic glass), PC, ABS, PVC, PS and other thermoplastics.
Product features General-purpose products for a wide range of plastics and a variety of materials have excellent adhesive bonding effect; high bonding strength, damage test can be achieved to the effect of rupture of the plastic body in a few seconds to locate a minute to achieve the highest strength, greatly improving work efficiency; cured completely transparent, the product does not yellow, not whitening; compared with the traditional instantaneous adhesive bonding, with the resistance of the environment test, not whitening, good flexibility, etc. Advantages. White, good flexibility and other advantages; P + R button (ink or electroplated keys) damage experiment can make the silicone rubber skin tear; low temperature resistance, high temperature and high humidity performance is excellent; can be through the automatic mechanical dispensing or screen printing sizing, easy to operate.
Advantages of Shadowless Adhesive: Environment/Safety ● No VOC volatiles, no pollution to the ambient air;
● Adhesive components in the environmental regulations to limit or prohibit less;
● Solvent-free, low flammability
Economy ● fast curing speed, a few seconds to tens of seconds to complete the curing, conducive to the automation of production lines to improve labor productivity
Curing speed is very fast.
● After curing, it can be inspected and transported, saving space
● Room temperature curing saves energy, for example, the energy required to produce 1g of light-curing pressure sensitive adhesive is only 1% of that of the corresponding waterborne adhesive and 4% of that of the solvent-based adhesive. Can be used for materials that are not suitable for high temperature curing, UV curing consumes up to 90% less energy than heat curing resins
● Simple curing equipment, only lamps or conveyor belts are needed, saving space
● One-component system, no mixing, easy to use
Compatibility ● Can be used for materials that are sensitive to temperature, solvents and moisture
● Controlled curing, wait time can be adjusted
● Controlled curing, wait time can be adjusted
● The curing time can be adjusted to suit the material's needs. Controlled curing, waiting time can be adjusted, the degree of curing can be adjusted
● Repeatable sizing for multiple curing
● UV lamps can be easily installed in the existing production line, without major changes
Methods of use Operating Principle: Shadowless Adhesive gluing process Shadowless Adhesive is also known as UV adhesive, which must be irradiated by ultraviolet radiation to the premise of the adhesive in order to be able to cure, that is, the photo-sensitive adhesive in the shadowless adhesive is not only a good adhesive, but also an excellent adhesive. That is, the photosensitizer in the shadowless adhesive and contact with ultraviolet light will be bonded with the monomer, theoretically no ultraviolet light source under the irradiation of the shadowless adhesive almost never cured.
The source of UV light is natural daylight and artificial light source. The stronger the UV light, the faster the curing speed is generally curing time ranging from 10-60 seconds. For natural daylight, the UV rays in sunlight on a clear day will be stronger and the faster the curing speed. However, when there is no strong sunlight, you can only use artificial UV light source. There are many types of artificial ultraviolet light source, the power difference is also very huge, small power can be as small as a few watts, high-power can reach tens of thousands of watts.
Different manufacturers of shadowless adhesive or different models of curing speed is different. Used for shadowless adhesive must be irradiated by light in order to cure, so the shadowless adhesive used for bonding can only be bonded to two transparent objects or one of them must be transparent, in order to be ultraviolet light can be transmitted and irradiated to the adhesive above. Beijing so-and-so company launched a high-efficiency poly ring ultraviolet lamps, for example, the lamp using imported fluorescent coating, can send out super ultraviolet light, generally can be done in 10 seconds to locate the 3-minute full curing speed. But as a surface coating or covering or fixed and other functions with the shadowless adhesive is not such a requirement. Therefore, in the use of shadowless adhesive before you need to make a small test according to your specific process requirements and process conditions.
Operating instructions: 1, the two objects to be bonded to have a transparent and clean surface, dry and free of grease;
2, UV shadowless adhesive coated on one of the surfaces, close the two planes, with the appropriate wavelength (usually 365nm-400nm) and the energy of the ultraviolet lamp or high-pressure mercury lamps used for illumination, light from the center to the periphery. Light from the center to the periphery, and confirm that the light does shine through to the bonded parts;
3, it is recommended that the light 6s or so, the initial positioning, remove the remaining glue on the workpiece and then re-lighting to full curing;
4, curing time should be based on the different preparation materials, adhesive thickness, and UV intensity of the different and different. It is recommended that users purchase ultraviolet intensity tester, bonding before the light intensity test to reduce the scrap rate;
5, the temperature of the glue activity also has a small impact on the low temperature curing time should be extended appropriately;
6, the operation should not be applied to squeeze and repeated friction need to be adhesive materials, and recommended the use of stationary tools;
7, the plastic adhesive, should be considered plastic Plastic bonding, should consider the content of ultraviolet absorbers in the plastic, high content will seriously affect the transmission rate of ultraviolet light, and thus also on the curing efficiency of the glue to produce a significant impact, and even lead to the glue can not be cured;
8, large-area adhesive bonding is recommended to use low-viscosity products. Conditions, it is best to purchase vacuum equipment, laminating in a vacuum environment in order to remove air bubbles, improve the yield;
9, the above instructions are for reference only, the specific operation needs to be adjusted according to the specific circumstances of the customer
Disadvantages of shadowless adhesive: ● high raw material costs, does not contain low-cost solvents and fillers, adhesive prices
● UV light penetration of certain Plastic or semi-transparent material penetration is weak, limited curing depth, the geometry of the cured product is limited, opaque parts and UV light irradiation is not easy to cure the dead space
● General UV adhesive can only bond light-transparent materials, bonding opaque materials need to be combined with other technologies, such as light delay (cationic) curing, light and heat dual curing, light - moisture dual curing, etc.
In addition, UV adhesive can also be used as a curing agent, so it is not suitable for the adhesive to be used on the same material. Glass products ● Glass products, glass furniture, electronic scale bonding
● Crystal jewelry crafts, fixed inlay
● Transparent plastic crafts bonding, PMMA/PS
Electrical and electronic industry ● Terminal blocks/relays/capacitors and microswitches coating and sealing
● Printed circuit board (PCB) paste surface components
● Printed circuit boards on the integrated circuit block bonding
● Coil wire terminal fixing and component bonding
Optical field ● Optical fiber bonding, optical fiber coating protection, repair connections
Digital optical disc manufacturing industry ● CD / CD-R/CD-RW manufacturing is mainly used for the reflective film layer, the protective layer of the coating
● DVD DVD substrate bonding, DVD packaging for the sealing cover also use UV curing adhesives
Medical supplies ● Hypodermic needles and syringes, intravenous tubing bonding, urinary catheters and medical filters
● Respiratory systems, butterfly and masks, intravenous catheterization devices, oxygenator, water reservoir, electronic diagnostic equipment and other medical equipment.
Other applications ● Micro motors: fixing, wire circuit board adhesive fixing
● Optical drives: laser head fixing, lens fixing, circuit board fixing
● Transfer: transfer adhesive, surface protection adhesive
● Automotive industry parts bonding: automotive lamp assembly, reversing mirrors, and the bonding of air bag parts and fuel injection system
Note 1. Is there any relationship between the curing speed of shadowless adhesive and the quality of glue? SGS Quality Report of Shadowless Adhesive
The curing speed of shadowless adhesive, especially the positioning speed, has always been a data that consumers are more concerned about. Measuring the quality of shadowless adhesive is multi-faceted: positioning time, curing depth, strength, film flexibility, etc. are all aspects of the assessment of the quality of shadowless adhesive. We believe that the faster the positioning speed, the greater the internal stress generated by the curing of the glue. This may cause the aluminum plate to fall off. General positioning speed in 6 to 10 seconds is appropriate. So the curing speed alone to judge the quality of shadowless adhesive is not good or bad is not right.
2. Is it better to apply more glue when bonding?
Shadowless adhesive in the bonding is not the more the better. Experiments have shown that the thinner the glue layer, the higher the strength. Generally speaking, the thickness of the adhesive film is not more than 0.2 microns for the best.
3. Many consumers in the use of silhouette adhesive found in silhouette adhesive will sometimes be white, then silhouette adhesive whitening phenomenon by what way to quickly and accurately detect it?
The whitening phenomenon of shadowless adhesive is a common problem, but because the whitening phenomenon is not serious, the film is relatively thin, it is generally difficult to find. Now on the market for glass sticking to metal shadowless adhesive more or less this problem exists. Take a glass plate, glue drops on it, and then put it under the light for 1 2 minutes, take it out and observe it, so you can quickly detect the whitening phenomenon of the shadowless adhesive. The degree of whitening phenomenon is directly related to the thickness of the glue film. The degree of whitening phenomenon of the glue has nothing to do with the intensity!
4. Shadowless glue viscosity?
Liquid movement by external forces, the measure of frictional resistance between its molecules, called viscosity. The greater the frictional resistance, the greater the viscosity; the smaller the frictional resistance, the smaller 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. Is the lower the viscosity the lower the strength?
There is no direct relationship between the viscosity and the strength of shadowless adhesive. If the viscosity is understood as the strength is not right, is a misunderstanding.
6. What is the chemical composition of Shadowless Adhesive?
By the zwitterionic polymer, monomer, photoinitiator, additives;
7. Shadowless glue performance characteristics:
Fast curing, controllable reaction; solvent-free, non-polluting; suitable for automated operations; wide range of adhesion, high bonding strength, wide range of use; excellent optical properties; colorless and transparent colloid, curing transparency rate of ?à90%; weathering is excellent, non-yellowing; shadowless glue Curing principle and curing conditions; shadowless glue in the photoinitiator (photosensitizer) in the ultraviolet radiation absorption of ultraviolet light to produce reactive radicals or cations, triggering the monomer polymerization, cross-linking and branching of the chemical reaction, so that the adhesive in a few seconds from the liquid state into a solid; shadowless glue must be in the wavelength of 200nm ~ 400nm UV irradiation under the curing;
8. Shadowless Glue What is the difference between shadowless glue and other glues?
Shadowless glue in the ultraviolet irradiation 1-5 seconds initial solid, 20-30 seconds can be bonded to complete, irradiation can reach a higher intensity, can meet the needs of automated production line rhythm; the second generation of acrylic structural adhesive 1-10 seconds initial solid, 24 hours to reach the highest strength; room temperature curing epoxy structural adhesive 10-120 minutes initial solid, 7 hours to reach the highest strength.