Different Resin Manufacturing Process

The differences in resin production processes essentially stem from the following factors:

Different polymerization methods (condensation, addition, ring-opening, etc.)
Different raw material systems (acid/alcohol systems, isocyanate systems, phenolic resin systems, etc.)
Different viscosities (from low-viscosity liquids to high-viscosity semi-solids)
Different solid content requirements
Significant differences in reaction temperature and pressure
Whether steps such as vacuum, solvent recovery, and distillation are required

Therefore, different resins utilize different reactors, stirring methods, heating methods, and condensation systems.

alkyd resin production line

Comparison of the differences in production processes for major resin products

Type	Production Process	Temperature Range	Viscosity Range	Equipment Features
Alkyd resin	Esterification→dehydration→dilution→cooling	230-260℃ (high temperature)	Medium to high	External coil reactor, powerful stirring, azeotropic dehydration device
Epoxy resin	Addition reaction→vacuum degassing→ratio adjustment→cooling	120-180℃	High viscosity or even semi-solid	High-shear stirring vacuum system, strict temperature control
Acrylic resin	Solution polymerization→isothermal reaction→cooling and filtration	80-150℃	Low to medium	Equipped with a dropping tank, the reactor requires precise temperature control
Polyurethane resin	Addition or pre-polymerizaion→vacuum→formulation	70-120℃	Medium to high	Reactor requires nitrogen blanketing to prevent moisture ingress; high equipment sealing requirements
Phenolic resin	Acid/base catalyzed polycondensation→vacuum dehydration→pre-treatment before molding	80-180℃	Low to high	Stainless steel reactor, corrosion-resistant stirrer, high temperature control requirements
Ures-formaldehyde resin	Polycondensation→neutralization→concentration→cooling	70-120℃	Low viscosity	The entire equipment needs to be corrosion-resistant and capable of continuous production

Different resins have completely different equipment requirements

1. Different stirring systems

High-viscosity resins (epoxy, PU, phenolic) require: anchor, frame or wall-scraping stirring.

Medium-to-low viscosity resins (acrylic, urea-formaldehyde) require: frame or propeller stirring.

2. Significant differences in temperature control

Alkyd resins require high-temperature heating at 260℃.

Acrylic resins have lower reaction temperatures but require precise temperature control.

Polyurethane is temperature-sensitive; overheating can lead to yellowing or decomposition.

Therefore, the equipment must be customized with jacketed or external coil structures depending on the product.

3. Different vacuum and sealing requirements

PU resins are very sensitive to water and require a vacuum sealing system.

Epoxy resins require vacuum degassing.

Urea-formaldehyde resins need to prevent formaldehyde volatilization and also require good sealing.

4. Whether a solvent recovery system is needed

Alkyd and acrylic resins often use solvents, must be equipped with a condenser + reflux tank + water separator.

Solvent-free systems (such as some PU and epoxy resins) do not require this.

resin reactor

As a manufacturer of resin production line equipment, JCT configures different equipment for its customers based on the process differences of various resins, including:

reactor (jacketed/external coil/internal coil)
mixing methods (frame type, anchor type, paddle type, high-shear dispersion, etc.)
condensing systems
vacuum systems
control systems (automatic/semi-automatic)

To help customers achieve stable, efficient, and safe resin production.

Tags: resin