The type and properties of the glue
Time：2012-09-20 15:28:17 Hits：2487
1.What glue:
Glue is to be able to the adhesive material of the two objects. Glue not exist independently, it must be painted to play a bonding role between the two objects.
2.The viscosity of the glue (cps):
The viscosity of the glue is measured by Brookfield viscometer, the unit is "cps cps. The readings of the viscosity of the glue is generally between 300 ~ 30000cps. In the water-soluble binder, the solids content does not determine the viscosity of the gum, and in that within the formulations of the glue plasticizers, tackifiers, etc., affect the value of viscosity of the glue. The higher the temperature of the surrounding environment in the general case "viscosity ↓", "the viscosity of the temperature ↓ ↑." The viscosity of water at 27 ℃ "1."
3. Glue fluidity (rheology):
The low-and high-rpm power measured viscosity value and then take the ratio. Usually glue fluidity is preferably 1.5 to 3. The viscosity of the glue with its rheology has a great relationship. Glue stir ↑ dilutions ↓. Especially water-soluble glue, stir more dilute. The glue coating characteristics rheology: less than 1 hardest coating; 0 ~ 1.5 turbidite phenomenon; 1.5 ~ 3 good coating properties (rheology best); greater than 3 is too thin;
4. Minimum film-forming temperature (MFT):
At a certain temperature, the moisture in the binder is volatilized from liquid into solid critical state, its film-forming temperature. At this time, the dry layer is very brittle and has no cohesion.
5. Film-forming speed:
Film from glue to the formation of the two substrates in the effective integration of the time. It is influenced by the following factors;
☆ binder within the water distributing time (time is short film fast)
☆ high substrate porosity (porosity large effective combination of fast time).
☆ The adhesive coating amount (large, combined with the slow time).
☆ adhesive formulations, solids, etc. will affect the film-forming speed.
6. Period of glue regimen:
The glue film is formed in the two substrates, with the continuation of the time and the formation of the binding force. During this time, the, lowest binding force of the forming time is most important. After the formation of the lowest binding force, we can do other work, it does not affect the performance of the glue ultimately supplies. As time increases, the formation of the binding force of the glue after some time, is the most complete, the binding force is smooth, this is the highest binding capacity. Health is the glue binding force to the highest binding capacity from the lowest period. Usually glue minimum binding force is 24 hours. Health period of 1-7 days. The use of ambient temperature, different adhesive material glue will affect the health of
7. Waterproof glue Level:
Glue waterproof rating divided into four floor with glue waterproof rating should be more than three.
1: waterproof;
2: Indoor weak waterproof;
3: indoor strong waterproof;
4: Outdoor waterproof. FDA Standard: International close to human pollution-free "standard.
8. The solvent resistance of the glue:
With a reflection of the "acetone" (main component) in the paint test glue on acetone. Coated paint, paint solvents on film swelling rate. The greater the quality of the glue on the worse. Poor quality of the glue in the presence of a high-temperature environment of the "acetone" glue film in about half an hour will slowly darken, the cohesion of the film decline.
