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Analysis And Solutions Of UV (photocuring) Adhesives Common Problems Nov 24, 2017

1. What is the difference between UV glue and other adhesive?

UV glue can be fixed for 1-5 seconds after UV irradiation, and can be glued to it for 20-30 seconds. The high strength can be achieved after irradiation, which can meet the needs of the rhythm of automated production line.

The second generation acrylic structure was fixed for 1 to 10 seconds, and the maximum strength was reached 24 hours. At room temperature, the epoxy structure is fixed at the beginning of 10-120 minutes, and the maximum strength can be reached in 7 hours.

2. Is UV glue poisonous? Why use UV glue skin red and swollen, SAO itch?

UV glue is a green and environmental chemical products, without any organic solvent, 100 percent solid content of glue. The human body will not produce any carcinogenic and pathogenic effects.

The UV glue series of main component is acrylate oligomer and part of the series of acrylate monomer, acrylic acid ester monomer has certain volatile on the skin has certain stimulating, when in contact with for the first time, if improper protection under the condition of direct contact or long-term exposure to high concentrations of environment, can cause skin allergy, such as eye irritation, rash, itching, etc. But after adjusting to a period of time, no more allergenic, skin rash and so on.

Measures:

1. Maintain a good ventilation environment;

2. Operators must wear protective clothing, glasses, masks, gloves or gloves, etc.

3. Be careful to wash your hands frequently, change your clothes gloves, etc.

4. Once the glue touches the skin or any other part of the body, rinse immediately with plenty of water and rinse with soap and water.

5. The body resistance is poor, when in contact with glue for the first time, please oral allergy drugs, such as chlorpheniramine maleate, not the root, astemizole, karry temple, etc. (general pharmacy stores) two weeks. For an operator who has caused an allergy, do not use your hands to catch any other body parts during the initial period of allergy. Start with an anti-allergy or anti-allergy shot, and the general allergy will soon disappear.

6. For those who are allergic to skin or resistance, it is recommended to replace the job and do not operate the UV glue.

3. UV glue why did UV take long, or do not do, surface glue hand?

When the glue solidifies, the surface of the colloid is exposed to air, and because of the inhibiting effect of air, the gel surface cannot be unglued, which is the phenomenon of sticky hands.

The solution to this problem is:

1. High uv intensity;

2. High photosensitive dose;

3. Rapid reaction system;

4. Use uv light source with 265nm wavelength.

4. Why does UV glue become white after curing?

Causes of this phenomenon in the glass industry, white phenomenon is the small bubble rubber itself, because the glue will produce in the process of solidification shrinkage, uneven if the rubber thickness or hardness is too high, contraction generated by internal stress cannot be released, after a long time can appear tiny air bubbles, which we see white phenomenon, fall off until the adhesive materials.

The solution to this problem is:

1. Select the UV glue for the flexible formulation;

2. Uniform adhesive layer control;

3. The first solid using low power of UV lamps and lanterns, slow to make glue solidified, positioning and then use the high power UV curing equipment depth, because the glue curing speed too fast, will increase the shrinkage rate of glue.

5. The more glue in UV adhesive, the better?

UV glue is not glue when the glue is more the more the better, the experiment proves that the rubber layer is thinner, the intensity is higher. Generally, the film thickness is not more than 0.2 micron.

6. Is the curing speed of UV glue related to the quality of glue?

The curing speed of UV glue is always a data that consumers are concerned about.

The quality of UV glue is measured in many aspects: location time, curing depth, strength and elasticity of the film are all aspects of the quality of UV glue.

We believe that the faster the positioning speed, the greater the internal stress resulting from the solidification of the glue. This can lead to the shedding of the artifacts. The general positioning speed is 6 to 10 seconds.

Therefore, it is wrong to judge the quality of non-shadow glue by curing speed alone. Rather, it is predicated on its subsequent weatherability.

7. The lower the viscosity of UV glue, the lower the strength?

There is no direct relationship between the viscosity and strength of UV glue. If the viscosity is understood as the strength is incorrect, it is the misunderstanding of cognition.