Synthetic adhesives are composed of a main agent and an auxiliary agent. The main agent is also called a main material, a base material or a sticky material; the auxiliary agents include curing agent, diluent, plasticizer, filler, coupling agent, initiator, thickener, Antioxidants, polymerization inhibitors, stabilizers, complexing agents, emulsifiers, etc. may also include flame retardants, foaming agents, defoamers, colorants, and antifungal agents according to requirements and applications.

 

The main agent

The main agent is the main component of the adhesive, which dominates the adhesive performance of the adhesive, and is also an important sign to distinguish the type of adhesive. The main agent is generally composed of one, two, or even three polymers, which are required to have good adhesion and wettability. The substances that can be used as stickies are:

1. Natural polymers, such as starch, cellulose, tannin, gum arabic, and sodium alginate; and animal glues such as bone glue, fish glue, blood protein glue, casein, and shellac.

2. Synthetic resins are divided into two categories: thermosetting resins and thermoplastic resins. Thermosetting such as epoxy, phenolic, unsaturated polyester, polyurethane, silicone, polyimide, bismaleimide, allyl resin, furan resin, amino resin, alkyd resin, etc .; thermoplastic resins such as polyethylene , polypropylene, polyvinyl chloride, polystyrene, acrylic resin, nylon, polycarbonate, polyacetal, thermoplastic polyester, polyphenylene ether, a fluorine resin, polyphenylene sulfide, polysulfones, polyketones, polyphenylene ester , Liquid crystal polymers, etc., and its modified resins or polymer alloys. It is the largest amount of a class of adhesive material.

3. The rubber elastic body. The main neoprene rubber, butyl nitrile ethylene propylene rubber, fluorine rubber, polyisobutylene, polysulfide rubber, natural rubber, chlorosulfonated polyethylene rubber; thermoplastic elastomer member mainly elastomer and polyurethane elastomer.

4. In addition, inorganic bonding materials, such as silicates, phosphates and phosphoric acid - copper oxide.

 

Additives

In order to meet specific physical and chemical characteristics, various auxiliary components added are called auxiliaries, for example: in order to form the main adhesive to form a network or body structure, and to increase the cohesive strength of the adhesive layer, a curing agent is added (they and the main adhesive and generating cross-linking reaction); in order to accelerate the curing, lowering the reaction temperature and the addition of a catalyst or curing accelerator; order to improve the resistance to atmospheric aging, heat aging, the arc aging, ozone aging properties antioxidant was added; order to impart certain adhesives nature, cost and adding a filler; subbing layer to reduce the rigidity, toughness increased toughener was added; the process for improving the viscosity is lowered, and so extend the life of added diluent.