Hot-melt Adhesive for Woodwork WD8612H
WD8612H is a single component reactive polyurethane hot melt adhesive, which is a solid at room temperature, becomes a liquid after heating, and forms a preliminary bond after coating and bonding. It then has excellent adhesion, temperature resistance, water resistance, oil resistance, and aging resistance due to its ability to cure with air and moisture on the surface of the bonded material.
The product complies with the limit of volatile organic compounds in adhesives (GB33372-2020).
WD8612H is widely used for bonding wood, metal, foam, plastic and other materials due to its moderate opening time and good bonding performance.
1.Single component, easy to manage, suitable for mechanized operation, high efficiency.
2.Solid content of 100%, no pollution, environmentally friendly.
3.Wide applicability, with good adhesion to plastics, wood, etc.
4.Moderate opening time and high initial intensity.
5.After curing, it has good temperature resistance, water resistance, cold resistance, and durability.
Performance indicators
|
Project |
Standard |
Test method |
|
|
Material |
Polyurethane |
||
|
Appearance |
Melt temperature |
Milky white liquid |
visualization |
|
Room temperature |
Milky white solid |
visualization |
|
|
Viscosity/mPa · S |
120℃ |
10000~20000 |
HG/T 3660-1999 |
|
140℃ |
5000~8000 |
HG/T 3660-1999 |
|
|
Stability/mPa · S (120 ℃&12h) |
120℃ |
＜40000 |
GB/T16998-1997 |
|
140℃ |
＜20000 |
GB/T16998-1998 |
|
|
Specific gravity/g/cm3 |
1.0~1.2 |
GB/T 13354 |
|
Operating conditions
|
Project |
Standard |
|
Opening time/min (23 ± 2 ℃ * 55 ± 5% RH) |
3~10 |
|
Melt glue temperature/℃ |
120~160 |
|
Glue application temperature/℃ |
120~140 |
|
Coating method |
Rolling coating, scraping coating |
|
Coating amount g/m2 |
60~120 |
|
Coating speed m/min |
5~20 |
Melt viscosity - temperature curve
| Temperature/℃ | 80 | 90 | 100 | 110 | 120 | 130 | 140 | 150 | 160 |
| Viscosity/mPa · S | 92702 | 54747 | 32545 | 20353 | 13463 | 9358 | 6785 | 5090 | 3937 |
Preprocessing
1.The bonded surface has oil stains, dust, and affects the bonding strength, requiring clean, dry, oil-free, or dust-free treatment.
2.For materials such as PP with surface energy below 32 dynes, corona or flame treatment is required to ensure that the dyne value reaches 36 or above.
3.The surface temperature of the adhered material during use should not be lower than 20 ℃. If the temperature is too low, the opening time will be shortened, which may affect the operation time and lead to poor adhesion or even detachment. If it is necessary to bond the material, it needs to be heated.
Coating method
1.The melt adhesive process uses a sealed melt adhesive tank and a 20L/200L melt adhesive system. If any abnormal viscosity, particles, foaming, or other phenomena are found during the melt adhesive process, please contact Kangda technical sales personnel immediately.
2.The coating methods include rolling coating, scraping coating, and seam nozzle spraying.
Curing time
The curing process of WD8612H depends on the following factors:
1.The humidity and temperature in the environment for use and curing require a certain level of temperature and humidity for the chemical polymerization of PUR. Therefore, it is recommended that the curing of the product be carried out under appropriate temperature and humidity conditions. Generally, it is recommended that the temperature not be lower than 25 ℃ and the humidity not be lower than 50% for curing for 1-7 days.
2.Humidity on the surface of the bonded substrate.
3.Breathability of the bonded substrate.
4.Adhesive area/adhesive layer thickness in application.
Cleaning method
1.Melt glue system: First, drain the residual adhesive from the melt adhesive system, then add cleaning agent WD8600 for hot melt rinsing until the polyurethane hot melt adhesive residue is completely drained.
2.Glue application system: The scraper and roller are rinsed with specialized cleaning agent WD8602.
3.For already cured adhesives, please consult with Kangda technicians.
1.Local exhaust devices should be installed in the operating area to ensure ventilation.
2.Hot melt adhesive must be heated when used, and personal protective equipment such as work clothes, cotton gloves, protective masks, goggles, etc. should be worn.
3.Due to the moisture curing reaction of the product, the packaging sealing should be carefully checked before use to ensure complete sealing and product integrity.
4.Please read the product safety manual carefully before use.
Environmental temperature: Store in a cool and dry room at 5-35 ℃.
Storage period in the original sealed container: 12 months.
Aluminum foil bag/drum sealed packaging: 20kg/drum or 25kg/drum or 200kg/drum.
