What are the methods of using universal adhesive

Universal adhesive usually refers to a class of solvent-based adhesives common to the building decoration and hardware maintenance industry, because of its wide range of adhesive, easy to use and named, generally can be used for wood, aluminum composite panels, leather, artificial leather, plastics, rubber, metal and other soft and hard materials bonding.

 

The main component of common universal adhesive is neoprene, generally using benzene, toluene, xylene as a solvent, yellow liquid viscous, with good resistance to oil, solvents and chemical reagents.    

 

1.Construction conditions

 

The suitable bonding temperature of universal adhesive is 25±5℃, humidity is 55-75%, and it should be stirred well before use. Universal adhesive contains volatile solvents, the construction should keep the air unobstructed, do not approach the open fire or high temperature. Generally speaking, universal adhesive in winter below 5 ℃, there may be gel phenomenon, affecting the use, then available 30 ℃ -50 ℃ of hot water will be soaked in glue cans for 20 minutes can be restored to its original state, the performance remains unchanged, can continue to use.

 

2.Surface requirements

 

Universal adhesive in the use of the surface of the sticky object before the appropriate treatment is necessary, including oil, rust, moisture, sanding, to keep the surface clean, dry, firm; oil, stain removal can be used 120 # gasoline, toluene or ethyl acetate and other fast-drying solvents to scrub clean and dry, sanding, sandpaper is generally gently sanded with 0 # or 1 # sandpaper. When gluing plywood, flooring, bamboo or other wood products, the moisture content of the glued material before gluing must be required to be below 8%, if it is higher than 8%, the glued material should be air-dried or dried before gluing.

 

3.glue

General materials can be coated with glue once. For porous materials, need to glue 2-3 times, and must be in the last glue solvent completely evaporated before the next glue, not too hasty.

 

In order to prevent the adhesive layer residual air, brush should be moved in the same direction, which is conducive to the discharge of air, but note that the scraping speed should not be too fast. Generally, the thinner the glue layer, the fewer defects, the smaller the shrinkage, the higher the bonding strength. The adhesive layer should be thin, not thick, the adhesive layer is too thick, will not dry, sticky and blistering and other defects. Therefore, under the premise of ensuring that there is no lack of glue, the glue layer as thin as possible. The thickness of the glue layer should generally be controlled at 0.08-0.15mm is appropriate, that is, the amount of glue for 250-350g/m2.

 

4.drying

 

The purpose of drying is to let the solvent evaporate cleanly, increase the viscosity and promote curing. After applying glue must make the solvent evaporate cleanly, do not immediately bonding, so as to avoid the adhesive layer sticky or produce bubbles, resulting in a decline in bonding quality. The drying time is generally 5-15 minutes / 25 ℃. To be a dry film of the adhesive layer (with a finger touching the non-stick finger), should be immediately aligned with the adhesive; drying time should not be too long, so as not to lose the adhesive layer of viscosity, affecting the bonding strength.

 

5.Bonding and pressing

 

Universal adhesive viscous force, bonding must look at the right time, a one-time alignment of the position of the bonding, not to move back and forth. After bonding, take the press, hammer pressure or rolling way to drive away the air, dense adhesive layer, improve the quality of bonding.

 

6.Maximum strength

 

Although the universal adhesive can form a good adhesive force in a short period of time, it takes 3-5 days to reach the maximum strength, so the joints with large bearing force should be placed for a sufficient period of time before use.

 

7.Storage

 

Universal adhesive should be stored in a cool, dry and away from children. Do not let direct sunlight, high temperature, poor sealing or long exposure time, the solvent volatilization will cause viscosity is too large, can not be constructed. Available toluene, ethyl acetate, butanone or acetone or flush thin, can be stirred evenly continue to use.

 

8.Other

 

Furniture surfaces such as wood grain or cat's eye paper, it is recommended to use water-based latex, otherwise the strong solvents in the universal adhesive will dissolve the grain of the wood grain paper. Universal adhesive can not stick can be toluene, ethyl acetate, butanone, acetone and other dissolved plastics, such as polystyrene rigid foam (commonly known as benzene), etc., it is recommended to switch to neoprene latex for bonding.