Synthetic adhesive

Synthetic adhesive is composed of main agent and auxiliary agent, which is also called main material, base material or adhesive material; auxiliary agent includes curing agent, diluent, plasticizer, filler, coupling agent, initiator, thickener, Anti-aging agents, polymerization inhibitors, stabilizers, complexing agents, emulsifiers, etc., according to requirements and applications may also include flame retardants, foaming agents, defoamers, colorants and mildew inhibitors and other components.

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 or two or even three polymers, and it is required to have good adhesion and wettability. The substances that can be used as stickies are:

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

2. Synthetic resins are divided into 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 resin such as polyethylene , Polypropylene, polyvinyl chloride, polystyrene, acrylic resin, nylon, polycarbonate, polyoxymethylene, thermoplastic polyester, polyphenylene ether, fluororesin, polyphenylene sulfide, polysulfone, polyketones, polyphenylester , Liquid crystal polymer, etc., and its modified resin or polymer alloy, etc. It is the largest type of adhesive.

3. Rubber and elastomer. Rubber mainly includes neoprene, butyl nitrile ethylene propylene rubber, fluorine rubber, polyisobutylene, polysulfide rubber, natural rubber, chlorosulfonated polyethylene rubber, etc.; elastomers are mainly thermoplastic elastomers and polyurethane elastomers.

4. In addition, there are inorganic binders, such as silicate, phosphate and phosphoric acid-copper oxide.

Additives

In order to meet specific physical and chemical characteristics, the various auxiliary components added are called additives, for example: in order to make the main body adhesive form a network or body structure, increase the cohesive strength of the adhesive layer and add a curing agent (these are combined with the main body adhesive Reaction and cross-linking); curing accelerator or catalyst is added in order to accelerate curing and reduce the reaction temperature; anti-aging agent is added in order to improve the performance of atmospheric aging resistance, thermal aging, arc aging, ozone aging, etc.; in order to give the adhesive certain certain Add fillers for properties and cost reduction; add tougheners to reduce the rigidity of the adhesive layer and increase toughness; add diluents to improve the processability, reduce the viscosity, and extend the service life.

1. Curing agent

2. Solvent

3. Plasticizer

4. Filler

5. Toughener

6. Coupling agent

7. Other additives: initiators, accelerators, tackifiers, polymerization inhibitors, stabilizers, anti-aging agents, complexing agents, emulsifiers.