Is the glue poisonous?

Generally, glue is nontoxic, but glue like 502 is toxic.

Glue is an intermediate connecting two materials, which mostly exists in the form of aqueous solution and belongs to fine chemical industry. There are many kinds of glue, which are mainly classified according to the binder, physical form, hardening method and the material of the adherend.

Common quick-drying adhesive (the common-1203 quick-drying adhesive-ethyl cyanoacrylate strong quick-drying adhesive is one kind), epoxy resin adhesive, anaerobic adhesive water, UV adhesive (ultraviolet curing), hot melt adhesive, pressure-sensitive adhesive, latex, etc.

definition

Glue is a substance that can bond two objects. Glue does not exist independently, it must be applied between two objects to play a bonding role. Chemical composition in glue, in water environment. The polymers in glue (vinyl acetate in white glue is a petroleum derivative) are all round particles, and the radius of the particles is generally between 0.5 and 5 μ m.

principle

The adhesion of objects is achieved by the tension between polymers in glue. In glue, water is the carrier of medium and high polymers, and water slowly immerses the polymers into the tissues of objects. When the water in the glue disappears, the polymer in the glue will rely on the tension between them to tightly combine the two objects.

In the use of glue, too much glue will make the polymers in the glue squeeze together and will not produce good tension between the polymers. At the same time, water between polymers is not volatile. This is why "the thicker the adhesive film, the worse the bonding effect of glue" in the bonding process. If the amount of glue is too much, the glue plays a "filling role" rather than a bonding role. The adhesion between objects depends not on the adhesion of glue, but on the "cohesion" of glue. If it is not water-soluble, the principle is similar, that is, using other solvents instead of water.