Release Agent Advantages And Selection In Pultrusion Process

The release agent in the pultrusion process has many advantages:

1.it's easily dispersed in the resin;

2.it will help clean pultrusion mould; 

3.to protect them against thecorrosion of metal mold; 

4.in reducing the resistance, reduce the pultrusion die loss andimprove the production efficiency; 

5.it can reduce the surface tension of resin mixture,reduce the viscosity of the resin, improve on the enhancement of invasive packing material,resin, improved liquidity resin; 

6.an auxiliary arc surface quality improved global andcomponent, make product surface smooth; 

7.does not affect the curing characteristics ofthe resin, without changing the application period mixed resin, does not affect the physical and mechanical properties of products, does not affect the products of weathering resistance.

The release agent selection:

The release agent is to be directly added to the resin, it is compatible with lresin, but that is not compatible with the cured resin, under certain processing conditions of temperature, diffusion from the matrix resin pultruded into the curing product surface, forming a layer of isolation membrane between the mold and product, to release effect.

The release agent are generally phosphate, phosphoric acid, stearic acid salt eggs,triethanolamine oil etc..

With stripping effect of zinc stearate is better. Because the resin viscosity, directly addingpowdered zinc stearate is difficult to stir, and stearic ester zinc loose, large volume, air entrainment is more, resulting in more resin bubble. So before you use it, usually inaddition of crosslinking agent zinc stearate, make it become the batter evenly, and thenadded to the resin. There was no significant effect of using zinc stearate as releasing agenton the product color, curing rate and viscosity of resin.

                                                                                       Source: www.unicomposite.com