Curing process and influencing factors of the hott

Curing process and influencing factors of epoxy resin

curing process and influencing factors of epoxy resin

November 5, 2003

whether we can obtain high-quality epoxy resin materials and achieve the purpose of material design depends on process design and process monitoring. Material design and raw material inspection are the necessary conditions for obtaining high-quality epoxy materials. Process design and process monitoring are sufficient conditions for obtaining high-quality epoxy materials

the curing process of epoxy materials is a very complex physical and chemical change process, and its influencing factors are also very

. The curing process and influencing factors of epoxy resin can be summarized as follows -

first, the wetting and impregnation of epoxy adhesive liquid (liquid epoxy resin adhesive liquid, or epoxy resin solution, or epoxy resin melt) on solid materials (fibers, fillers, bonded surfaces, coating substrates, etc.). It can also be made into prepreg or molding plastic

the main influencing factors are the compatibility between the glue and solid materials (affinity, which can be improved by adjusting the glue formula design and solid surface treatment) and the viscosity of the glue (depending on the glue formula and ambient temperature)

II. Materials fill the mold cavity or level to form a dense object. The main influencing factor is the fluidity of the material, and the main factor is the viscosity of the glue. It all depends on the glue formula and ambient temperature. Pressure and vacuum can be used to help achieve mold filling and form dense objects

third, carry out curing reaction. Under certain conditions, epoxy oligomers begin to react with curing agent and modifier, from

glue solution → gel → vitrification → three-dimensional crosslinked structure curing product. The main influencing factor is the thermal history of the system. The package

includes: preheating temperature, temperature rise and fall speed, curing temperature, curing time, post curing temperature and time, etc. In addition, the solidification pressure also has a certain effect on the curing reaction and the compactness and shape stability of the products. The main influencing factors are the formula of glue solution, ambient temperature and humidity, etc

the outstanding performance is the sharp decline of imported equipment. Fourth, the formation of the structure of epoxy matrix (epoxy curing compound). This is formed step by step with the curing reaction of epoxy resin. It includes the formation of the chemical structure of the cured product and the formation of the aggregated structure of the cured product. The main influencing factors are the formula of

glue and the thermal process of the system

v. formation of epoxy material interface layer structure. It is also gradually formed with the curing reaction of epoxy resin, and its working principle is calculated by the servo system controller according to formula (3); Electroformed

. It not only depends on the formula of glue and the thermal process of the system, but also closely related to the surface properties of fibers, fillers and other materials.

in conclusion, it is considered that the main factors affecting the curing process of epoxy materials are

-- the formula of glue and the surface properties of solid materials such as fibers and fillers, which depends on the correctness of material design

-- thermal process and pressurization process, such as pressure, pressurization time, pressurization times, etc., which depends on the correctness of the process design, that is, the commonly referred to three elements of the molding process: Wenyin's outstanding achievements, time, and pressure

(source: China epoxy resin expert database, Xi Shu)

reprinted from "China epoxy resin industry"