Adhesive Rubber Cement


Adhesive Rubber Cement:

Rubber cement is a solution of unvulcanized (gum) rubber in a solvent, and is used as an adhesive. Ideally, it is meant to join two pieces of rubber together, which involves a chemical cohesion process.

When joining two pieces of rubber, only one surface has to be coated with rubber cement since they are the same material. However, when joining paper together, both pieces need to be covered with rubber cement.

When rubber cement dries, only the parts in contact with the paper remain, which holds the two pieces together. The household type of rubber cement finds wide use for applications such as mounting photographs. The joined pieces of paper can be pulled apart without damaging either piece.

Natural adhesives are easy to apply and in general are water soluble. Synthetic adhesives are divided into four chemical categories: thermoplastic, thermosetting, elastomeric, and combinations thereof.

Thermoplastic adhesives, such as polyvinyl alcohol and acrylics, can be resoftened since the materials do not crosslink upon curing. They require heat or a solvent to create a bond. Thermosetting adhesives, which include epoxies, cannot be heated and resoftened after curing because they do crosslink upon curing.

Elastomeric adhesives: are based on isoprene rubber or synthetic polymers that combine both elasticity and toughness. Silicone is a typical example.




Adhesives are used: in a wide range of industries, including packaging, construction, electronics, transportation, furniture/woodworking, and medical.

Natural rubber: comes from the Hevea brasiliensis tree originally found in Brazil. To make solid rubber, the tree is tapped and the latex is collected in a small cup, where it coagulates into a lump. This lump, together with the leftover flow and other pieces are collected together and processed at high temperature. This destroys most of the proteins and produces a solid material.

Synthetic rubbers: include neoprene and latex. Synthetic rubbers are made using various chemical processes. The application determines what types of rubber and solvent are used.

The Manufacturing Process The process to make rubber cement is relatively simple. After the rubber is broken down into smaller pieces, it is mixed with the hexane-or heptane-based solvent and then various sizes of containers are filled with the liquid. Most equipment is automated.

Mixing First, the blocks or slabs of rubber are broken into smaller pieces. Rubber mills, equipped with two large rollers, are used. The rubber may be reduced in large high speed mixers equipped with sharp blades, which pulverize the rubber into a size similar to sawdust. The solvent ingredients are mixed in tanks, ranging from 40 to 6,000 gal (150 to 22,700 1), equipped with paddles. The rubber is added slowly until it is wetted by the solvent and is suspended or dissolved in the solution.




Packaging
Once the solution is thoroughly mixed it is fed into an automated filling line, which fills each container, caps it, and tightens the cap. Rubber cement is packaged in 4, 8, and 16 oz (118, 237, and 473 ml) bottles or quart (946 ml) and gallon (3.8 1) containers. Because the rubber cement is flammable, explosion proof equipment is used. The containers are then packaged in cardboard cases and properly labeled. For larger containers (tank trucks or drums), the solution is gravity fed or pumped into these containers from the bottom.

Note: This is basic information only, if you want to start independently, Please have practical experience or basic education regarding this. First of all please have a detailed project report from scracth level to end process, then you will have a clear plan to impliment.


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