DB-3172S Aluminium special glue manual

DB-3172SA/B special aluminum-plated adhesive is suitable for the compounding of aluminum plating and other plastic films. The main agent is a modified polyester polyol solution dissolved in ethyl acetate, and the curing agent is an isocyanate adduct dissolved in ethyl acetate.
One. Performance characteristics
1. This product has high initial adhesion and is especially suitable for compounding with aluminum-plated structure, which can reduce or eliminate the aluminum-plating transfer phenomenon of aluminum-plating compound.
2. It has good wetting performance and coating processing performance for the substrate, and there are few white spots when aluminizing.
Two. Product index


DB-3172SA main agent

DB-3172SA main agent


Light yellow transparent liquid

Light yellow or colorless transparent liquid

Solid content(%)







Ethyl acetate

Ethyl acetate

Mix ratio



Three. How to use
1. Standard ratio (weight ratio): component A (main agent): component B (curing agent) = 20: 2.5, when the air humidity is high (greater than 70%) and polyurethane ink is used for printing, an appropriate amount of curing must be increased Agent 10--20%.
2. Dilution: Calculate and weigh out the ethyl acetate required for a certain working concentration (the water content of ethyl acetate cannot exceed 200ppm, and it is not allowed to contain alcohol, amine and other compound impurities), and then go to the main unit of known weight Add ethyl acetate to the agent, and stir it in a fixed direction (such as clockwise direction). After it is uniform, add the curing agent and stir it again. It is best to mix the entire barrel of the main agent with the entire barrel of curing agent, because the curing agent is small, and the distribution of several times will result in low weighing accuracy. The viscosity of the solution must be considered when calculating the working concentration, because the viscosity will affect the coating amount and coating state.
3. Standard ratio and solvent comparison table
Working concentration(%) Component A(kg) Component B(kg) Thinner(kg) Viscosity(25℃,3#Zahn Cup),S
40% 20 2.5 18.2 14.20
35% 20 2.5 24.0 12.70
30% 20 2.5 31.8 11.53
25% 20 2.5 42.6 11.19
4. Calculation of coating amount: There is a rough empirical formula for the calculation of the coating amount of Bumeilan and laser coating rollers for reference:
 Dry base coating amount (g/㎡) = 0.2 × working fluid concentration% × mesh depth µ × working fluid specific gravity
The above formula cannot be applied to the electro-engraving coating roller and the pyramid-shaped embossing coating roller. The specific gravity of the working fluid with a concentration of 33% is 1; the specific gravity with a concentration of 26% is 0.96. The specific gravity with a concentration of 45% is 1.04. Calculations with low accuracy can ignore the specific gravity.
5. Selection of coating amount: depending on the structure of the substrate and the requirements of use, the coating amount (dry basis) can be selected between 2.5-3.5g/㎡. The coating amount of ordinary food packaging bags can be less, and the peel strength can be satisfied. The white spots and bubbles are mainly considered. The coating amount of packaging bags with high peel strength requirements should be more points. The amount of glue is determined by the depth and working concentration of the anilox roller. It is recommended to use the best concentration of 25%-35%.
6. Drying: In order to make the solvent in the adhesive layer of the base film volatilize cleanly, the drying efficiency of the dryer should be improved as much as possible. The factors affecting the drying efficiency are hot air temperature, wind speed and air volume. The faster the composite speed, the higher the drying efficiency requirement; conversely, when the equipment drying efficiency is low, the composite speed can only be reduced. The wind speed and air volume of the composite machine are generally not adjusted after correction, but the hot air temperature and the composite speed often change. The principle of setting the hot air temperature is first to lower then higher to form a temperature gradient. The purpose is to prevent the coating surface from drying too quickly and hinder the further evaporation of the internal solvent. This is often referred to as "false drying." For example, when the wind speed of the nozzle of the drying oven is 30 meters/second and the composite speed is about 80 meters, the hot air can be set to 50-60°C, 60-70°C, 70-80°C, depending on the substrate and the coating amount.
7. Lamination: On the premise of not over-stretching or damaging the film, increase the temperature of the composite heat roller as much as possible. The temperature of the heat roller can be selected between 50 and 85°C. Note: The temperature of the heating cylinder is not equal to the temperature of the heat roller, and the temperature of the edge of the heat roller is not equal to the temperature of the middle of the heat roller. The linear pressure of the hot roller is determined by the cylinder diameter, air pressure, and the hardness and length of the silicone roller. Only the air pressure can be adjusted frequently, and different compound machines cannot compare the linear pressure of the heat roller with the reading of the pressure gauge.
8. Curing: The composite film off the machine should be sent to the curing room as soon as possible, and the composite film should be heated at 45-60°C. The uncured adhesive will melt and level, eliminating small bubbles and white spots. After continuous curing for 48 hours Can achieve satisfactory bonding strength. The circulation of air in the curing chamber is required to make the temperature of the curing chamber consistent; the air with a high solvent content in the curing chamber is continuously discharged, and the solvent concentration of the indoor air is reduced by convection, which is conducive to the continued evaporation of the residual solvent in the composite membrane.
Four, matters needing attention
1. The amount of glue to be mixed is determined according to the needs. It is used now. The best glue is best used up on the same day. The remaining glue can not be used in principle. If there is too much glue left, dilute it several times with a solvent, put it in a closed container, and store it in a cool and dry place. When working the next day, use the remaining glue as a diluent in a small amount (about 20% or less) into the newly prepared glue Used in liquid (not suitable for composite products with high quality requirements). If white turbidity, translucency and thickening are found, they can no longer be used.
2. Composite substrates such as BOPP, BOPET, BOPA, CPP, PE and other films require surface treatment, BOPP, CPP, PE surface tension requires 38 dyne or more, BOPET, BOPA need to reach 52 dyne or more. AL must ensure that the annealing and degreasing are clean. In principle, BOPET and BOPA that are not treated on both sides can not be compounded on both sides, otherwise the peel strength of the non-corona surface cannot be guaranteed.
3. The additives in the film, especially the slip agent, the content in the film directly affects the bonding strength of the composite film, which must be strictly controlled, especially when the polyethylene film is thick, so the film must be selected and used before use. test. So as not to cause unnecessary losses.
4. This product cannot be used for compounding of surface printing ink printing film.
5. If there are quality problems or abnormal phenomena during the use of glue, stop using it immediately, and keep the unopened glue, and notify our company as soon as possible so that technical personnel can be sent to deal with it.
6. The technical opinions provided in this manual are from good faith and are for reference only. Since each user’s equipment, process and raw materials are beyond our control, it is also the user’s responsibility to experiment with the products provided by our plant to verify suitability for the proposed process and use.
7. This product is flammable, so please pay attention when using it.
Five. Packaging and storage
Component A (main agent): 20 kg/drum
Component B (curing agent): 2.5 kg/barrel.
This product should be stored in a cool and dry place. The storage period of the main agent is 12 months, and the storage period of the curing agent is 9 months. After opening the package, it should be used up as soon as possible and can no longer be stored.

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