PU crystal glue BZ-5518-3

Features

BZ-5518-3 A / B series is a two-component room temperature curable 100% solids polyurethane resin， it does not contain any solvent. After curing, it forms a clear and transparent, crystal clear, and eye-catching protective coating, which is widely used in the dripping of signs, nameplates, and other crafts. BZ-5518-3A/B after curing has excellent weather resistance and ultraviolet resistance. It will not turn yellow for more than 2-3 years in outdoor sunlight. The surface is smooth and transparent, which can improve the quality of the product and win the reputation of customers.

Feature Description

BZ-5518-3A is a Polyisocyanate component, and BZ-5518-3B is a Polyol component. According to the requirements of different customers, we can provide products with different hardness, different curing times,s and different viscosity, to meet the requirements of manual and mechanical drip.

Component:

BZ-5518-3A

1. Alicyclic isocyanates R-N=C=O
2. Polyol resin R-[O-CH2-CH]nOH

BZ-5518-3B

1. Polyol resin R-[O-CH2-CH]nOH

2. Alicyclic isocyanates R-N=C=O

3. Catalyzer C8H8HgO2; CH3COOC6H5Hg

Colour:                     BZ-5518-3A：                Transparent liquid

BZ-5518-3B：                Transparent liquid

Mixing ratio:                  Weight ratio A: B=1:4, the error of proportioning is within 2%; And component A is as accurate as possible.

Viscosity (25℃)：             BZ-5518-3A： Hardener           30-80 mPa·s

                             BZ-5518-3B：Main agent        150-300  mPa·s

                             After mixing 100-180  mPa·s

Density (25℃)：               BZ-5518-3A：                    1.06±0.05 g/cm3     

                             BZ-5518-3B：                    1.02±0.05g/cm3     

Operation time (100g，25℃)     9-15min. It is recommended to run out within 12 minutes.

Curing time: 25ºC, 15-24 hours.

The curing time will increase with the decrease of temperature. If heating curing is required, the recommended temperature is 80℃. The curing time is 30-40min.

Storage life: In the original sealed barrel,  it can be kept for 3 months in a dry environment within the temperature range of 15℃ to 25℃.

Performance after curing:                                      Unit or test condition

Appearance    Transparent and smooth surface without ripple             Visual inspection

Hardness                    48-58                                  Shore -A

Absorbency                 ≤0.2%                          After 30 days of soaking

Temperature resistance         -20℃~80℃

Weather fastness      48 hours artificial climate aging test,   Irradiation(340nm)0.5w/m2

glue color does not change yellow,         Relative Humidity:60~80)%

no oil on the surface,                Black panel temperature(65±2）℃

no pulverization                  Rainy cycle:18min/102min(spraying time/not spraying time)      

Brief introduction of the application process

BZ-5518-3 has a manual drip type and a mechanical drip type. The manual drip type can be used for a long time and cured slowly, while the mechanical drip type can be used for a short time and cured quickly.

Manual drip process

A.Control the temperature at 25 ℃ and relative humidity <70 % , BZ-5518-KCrystallization may occur at low temperature, please heat it at 60 ℃ for 12 hours and then use it again. In winter, the heating time should be extended as far as possible according to the situation.

B. Place the substrate on a horizontal surface and fix it with a self-adhesive.

C. Clean the dust and oil stains on the surface of the substrate.

D. Weighing correctly BZ-5518-23A, BZ-5518-3B, mix well according to the weight ratio of 1:3.5

E. Manual drip injection of the surface of the base material.

F. Use a needle to move the glue to spread over the surface, and remove the residual bubbles.

G.The curing can be completed in 15-24 hours and can be collected for packing. When the temperature is low, the curing time will be longer.

Mechanical drip process

Note: when the automatic glue dropping machine needs to be cleaned, it can be cleaned with ethyl acetate solvent.

1. Pour BZ-5518-3A and BZ-5518-3B into the A B glue barrel of the automatic glue dispensing machine separately.
2. Insert the pump and seal it.
3. Adjust the ratio of a and B materials (1:3) with an electronic scale (accuracy 0.1g), place the substrate on the horizontal surface, and fix it with self-adhesive
4. Place the bottom material on the horizontal surface and fix it with adhesive.
5. Clean the dust and oil on the surface of the substrate.
6. Clean the mixing tube and dispensing head with ethyl acetate.
7. Stir the glue with a needle to make it spread all over the surface and remove the residual bubbles. When the glue has a wire drawing, put it into the oven at 80 ℃ and bake it for 30-40 minutes.
8. When the temperature is low, the curing time will be longer.

Operation details and attention (take the manual usage as an example)：

Suggested operating environment:

Dry constant temperature dust-free workshop (Recommended workshop operating temperature is 20 ℃ º C～25 º C), ventilated, the humidity in the workshop should be controlled below 70%, and indoor conditions are fixed. Pay close attention to humidity control in the rainy season.

II. Preparation for use:

1) Deal with the substrate to be clean, dry, and free of impurities. If it is a led substrate, it is recommended to wash the solder joint to avoid the reaction between residual components of soldering aid and PU glue. After washing the board, pay attention to wiping the washing part with a dry cloth after the washing water evaporates.

2) Prepare the mixing bottle or dropping bottle and blender. Requirements: clean, dry, and free of impurities. Do not use the mixing bottle or dropping bottle or blender that has been mixed with other glue before. Should pay attention to this.

• Correct weighing BZ-5518-3A/, by weight 1：3.5. After mixing the glue, please cover and tighten the lid of the glue bottle immediately to avoid steam in the air entering the glue bottle.

III. Stir evenly： Stir evenly in the same direction. Pay attention to scraping the bottom and side wall as much as possible, so that the mixing is more evenly. Stirring time control in 90 to 120 seconds (1 minute and a half to 2 minutes) is enough.

IV. Dispensing

Drop glue onto the surface of the substrate manually, and stir the glue with a needle to make the glue cover the surface. If there are residual bubbles, the needle can also be used to remove them.

It is suggested to use up the prepared glue within 12 minutes to achieve the best effect, and also improve the production efficiency. The fluidity will be affected after more than 12 minutes, which is not conducive to operate

V. Curing

Natural curing in 15-24 hours. When the temperature is low, the curing time will be longer.

If heating curing is required, the recommended temperature is 80 ℃. The curing time is 30-40min.

Attention to use and storage of PU glue

On crystallization at low temperature

For BZ-5518-3A, under 15 ℃ (24-hour average temperature), crystallization may occur after placing more than 24 hours. If the temperature rises, the crystallization phenomenon will disappear.

In autumn or winter, A glue can be recovered to clear liquid at 60 ℃ for 12 hours, then it can be taken out and placed for 30 to 50 minutes, and can be used after a little cooling.

• About Allergy

I. Manual operation of BZ-5518-3 may be allergic to certain people, such as those who are allergic to chemicals.

II. It’s better to wear film gloves during the operation. Wash hands with soap immediately after the operation and clean the parts contacted with glue.

III. The glue operation workshop should keep proper ventilation, which can increase the ventilation by the blower.

IV. Prohibited asthma patients.

3) About glue storage and usage

I. The optimum conditions: constant temperature and humidity, 25 ℃ and humidity is below 70%.

II. Recommended environment: in the general workshop environment, it can be stored for three months in a sealed and dark place.

III. The glue should be used up within one month when it has been opened, and the lid should be covered.

IV. In the rainy season, the operation workshop should pay special attention to the humidity. If the humidity is more than 90%, dehumidification is recommended.

4) Curing

I. In constant temperature 25 ℃, 15-24 hours natural curing.

II. If the temperature is lower than 15 ℃ and the temperature difference between day and night is large, it takes 24 to 36 hours to cure.

III. Curing at 80 ℃ for 30-40min; When the temperature is low, the heating time can be slightly extended.

IV. When the temperature is too low in winter, the workshop can increase the air heater to shorten the curing time.

Package specification

Packing is 5kg, 20kg, metal barrel

• Storage, transportation, and other precautions
• This product is non-dangerous goods and is transported as general chemicals.
• Please store under the condition of 15 ℃ – 25 ℃ relative humidity < 70% and keep away from light. Please refer to the packaging barrel for the storage period of the product.
• When the material is in contact with the eyes, immediately open the eyelid and wash with plenty of water for more than 15 minutes.
• When the material comes into contact with the skin, wipe it off with a cloth and wash the affected part with water and soap.

*Note: the above performance data shows that the humidity of the product is below 70% and the temperature is 25℃ ±3 ℃. The test data is only for customers’ reference, and can not guarantee all the data that can be achieved in a specific environment. Please subject to the measured data.

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