Epoxy adhesive composition (top)

Epoxy adhesive consists of epoxy resin, curing agent, plasticizer, accelerator, diluent, filler, coupling agent, flame retardant, stabilizer and other components. Among them, epoxy resin, curing agent, and toughening agent are indispensable components. Others decide whether or not they are needed.

1, epoxy resin

Epoxy resin is a polymer compound with two or more epoxy groups in the molecule and relatively low molecular weight

First, classification

There are many types and grades of epoxy resins, but bisphenol A glycidyl ether epoxy resin is often called bisphenol A epoxy resin and is the most important one. It accounts for 90% of the total epoxy resin output. The molecular structure is very long and will not be mentioned here! If you want to know, you can click on the epoxy resin will have a detailed description! Only a brief description is given here

1, bisphenol A epoxy resin

Bisphenol A epoxy resin, also known as general-purpose epoxy resin and standard epoxy resin, is known as E-type epoxy resin in China, and is made of bisphenol (BPA or DPP) and epichlorohydrin (ECH) in sodium hydroxide. Lower condensation:

According to the ratio of the raw materials, the reaction conditions and the methods used, different viscosity low molecular weight viscous liquids and high molecular weight, high softening point solids can be obtained. The average relative molecular mass is 300-7000. Appearance is nearly colorless or light yellow transparent viscous liquid or flaked brittle solids. The epoxy resin itself is a thermoplastic linear polymer, and the viscosity of the liquid resin becomes low when heated, and the solid resin softens or melts. Soluble in acetone, methyl ethyl ketone, cyclohexanone, ethyl acetate, benzene, toluene, xylene, anhydrous ethanol, ethylene glycol and other organic solvents.

2, hydrogenated bisphenol A epoxy resin

The hydrogenated bisphenol A type epoxy resin is a hydrogenated bisphenol A diglycidyl ether obtained by hydrogenation of bisphenol A hydrogenated hexahydrobisphenol A and epichlorohydrin catalyzed by sodium hydroxide. It is an epoxy resin with very low viscosity, long gel time, and good weatherability.

3, bisphenol F epoxy resin

The chemical name of bisphenol F epoxy resin is bisphenol F diglycidyl ether, abbreviated as DGEBF or BPF, which is formed by the reaction of phenol and formaldehyde under acidic catalyst to produce bisphenol F, and then reacted with epichlorohydrin under the catalysis of sodium hydroxide. Colorless or pale yellow transparent viscous liquid prepared by polycondensation

4, bisphenol S epoxy resin

Bisphenol S epoxy resin chemical name is bisphenol S diglycidyl ether, referred to as BPS or KGEBS, is bisphenol S and epoxy propane catalyzed by sodium hydroxide prepared, bisphenol S ring Oxygen resin has high heat resistance, and its heat distortion temperature is 60~700C higher than that of bisphenol A epoxy resin, and its solvent resistance is good.

5, bisphenol P epoxy resin

The bisphenol P type epoxy resin is prepared by synthesizing bisphenol P with 3-chloropropene and phenol as main raw materials, and then polycondensation with epichlorohydrin under the catalysis of sodium hydroxide. The bisphenol P epoxy resin has an epoxy value of 0.45eq/100g, an organic chlorine content of 1.38*10-3eq/100g, and an inorganic chlorine content of 1.84*10-4eq/100g. The bisphenol P-type epoxy resin has a flexible, low molecular chain. Good fluidity, lower viscosity than bisphenol A epoxy resin, higher compressive strength and impact strength than bisphenol A epoxy resin.

6, Hydroxymethyl bisphenol A epoxy resin

7, brominated bisphenol A epoxy resin

8, phenolic epoxy resin

The phenolic epoxy resins mainly include phenol linear phenol vinegar epoxy resin, o-cresol novolac epoxy resin, and resorcinol phenolic epoxy resin. In addition, tetraphenol ethane epoxy resin also belongs to novolac epoxy resin.

1, phenol novolac epoxy resin (EPN) ----- is a phenolic resin obtained by polycondensation of phenol and formaldehyde in acidic medium, and then with excess epichlorohydrin in the presence of sodium hydroxide A brownish-yellow viscous liquid or semi-solid obtained by polycondensation.

2, o-cresol novolac epoxy resin (ECN) ------ is o-cresol and formaldehyde condensation linear o-cresol resin, and then with epichlorohydrin in the presence of sodium hydroxide, Yellow to amber solid prepared after multiple steps of treatment.

3, epoxy resorcinol formaldehyde resin ----- chemical name resorcinol formaldehyde tetraglycidyl ether, is a reaction of resorcinol and formaldehyde with oxalic acid as a catalyst to obtain tetrafunctional phenolic resin. An orange-yellow viscous liquid obtained by polycondensation with epichlorohydrin in the presence of sodium hydroxide.

4, tetraphenyl ethane epoxy resin ------ chemical name tetrakis phenyl ethane glycidyl ether (PGEE), is a reaction of phenol and glyoxal in the presence of an acidic catalyst tetraphenol B Alkane, then reacted with epichlorohydrin under the catalysis of sodium hydroxide

5, naphthol phenolic epoxy resin (EEPN) ----- is a polycondensation of a-naphthol and formaldehyde solution, the synthesis of a linear type Chuang phenolic resin, and then reacted with epichlorohydrin catalyzed by sodium hydroxide.

9, glycidyl ester epoxy resin

1. Diglycidyl tetrahydrophthalate

Tetrahydrophthalic acid diglycidyl ester is formed by the reaction of tetrahydrophthalic acid with cycloheptachloropropane

2, diglycidyl phthalate (yellow viscous liquid)

Also known as glycidyl phthalate, is the reaction of phthalic acid and potassium carbonate to produce the corresponding salt. With epichlorohydrin under the action of tertiary amines

3, isophthalic diglycidyl ester (white solid powder)

Diglycidyl isophthalate, also known as glycidyl isophthalate, is produced by reacting isophthalic acid with epichlorohydrin.

4. Glycidyl terephthalate (white solid powder)

Glycidyl terephthalate, also known as glycidyl terephthalate, is produced by reacting terephthalic acid with epichlorohydrin.