Basic principles of reactive film adhesives
The mechanical theory of reactive film adhesive, from the microscopic point of view, any smooth solid surface is rough, uneven, full of pores, the adhesive into the surface of the grooves and micropores, curing to anchor, produce a strong bond.; According to the electrostatic theory, in this product, the electric double layer is formed by combining with the solid phase interface, thus generating electrostatic force to combine the two.
reactive film adhesiveFrom a microscopic point of view, any smooth solid surface is rough, uneven and full of pores. The adhesive penetrates into the grooves and pores on the surface and solidifies it to anchor it, resulting in a strong bond.; According to the electrostatic theory, in this product, the electric double layer is formed by combining with the solid phase interface, thus generating electrostatic force to combine the two. Then its adsorption theory holds that the bonded material is wet and closed to the interface. Contact generates intermolecular attraction and thus bonding strength. What needs to be known when using reactive thin film adhesives is to explain the bonds in polymer materials now. It is believed that the bonds between polymers are the diffusion and bonding of two molecular chain segments on one surface. Other explanations include the chemical bonding theory, which holds that the bonding is the result of the formation of chemical bonds between the adhesive and the surface molecules of the object to which it is bonded. In short, it is the medium between the label material and the adhesive substrate, which plays a connecting role. According to its characteristics can be divided into mobility. It has a variety of formulations, suitable for different surfaces and different occasions. Adhesive is an important element in adhesive material technology and the key to label application technology.
The PH value of the active adhesive film mixture should be controlled within the specified range; it must be coated heavier than the normal paste line; use as much heat as possible when producing cardboard; the water content of the paper surface should not be too high; stir more, the container The waterproof glue should be used up as soon as possible; if this is not possible, the solution is to add more resin. When the product is produced, it is mainly dried or bonded by surface moisture absorption. Some of the raw solid starch in the reactive film adhesive gelatinizes on the paste line to absorb water. The setup time is approximately a few seconds to a minute. The moisture is gradually absorbed by the air and the surrounding paper fibers. This traditional method is commonly used in corrugated board production lines and can quickly produce strong bonds. Therefore, in order to achieve a satisfactory binding effect, a slightly viscous suspoemulsion containing pregelatinized starch should be added to the aqueous starch emulsion. This kind of reactive film adhesive can suspend raw starch in water to prevent precipitation; increase the concentration that the rubber roller is easy to absorb, and form a paste layer of appropriate thickness on the rubber roller; adjust the viscosity to make the paper fiber fully wet and initially adhere; Ensure that there is a lot of water around the starch molecules of the raw starch, so that the starch can fully expand and really gelatinize when heated.
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