The water in the foam layer flows downwards, rinsing most of the entrained particles and returning them to the slurry. In addition, when the bubbles are merged in the foam layer, the area of ​​the gas-liquid interface is reduced, and the particles originally loaded on the bubbles are rearranged, and a "secondary enrichment action" occurs, so that the hydrophobicity is still attached to the bubbles, and the weak is Brought to the lower layer by water or into the slurry. This makes the grade of the foam product increase again, and this effect is called secondary enrichment.
There are many kinds of FRP profiles, such as FRP round pipe, FRP square pipe, FRP rectangular pipe, FRP round bar and FRP i-bar.
The basic components of FRP profile are resin and glass fiber (including cloth, felt, etc.). It is reinforced with fiber (including glass fiber, carbon fiber, organic fiber and other metal, non-metal fiber) and resin (mainly epoxy resin).Polyester resins, phenolic resins) are composite of other auxiliary materials (main auxiliary materials: mold release agent, curing agent, catalyst, sealing agent, UV light stabilizer, mold cleaning water, gel coat, etc.).It has high temperature resistance, corrosion resistance, high strength, low specific gravity, low moisture absorption, small extension and good insulation and other excellent characteristics. Fiberglass Round Tube,Frp Pultrusion Round Tube,Frp Round Hollow Tube,Frp Round Tube Hebei Long Zhuo Trade Co., Ltd. , https://www.hblongzhuo.com
In the three-phase foam, a part of the continuous body and the hydrophilic gangue particles are often entrained, and the particles are fixed on the surface of the collector to form a weak hydrophobic property, and the bubbles are brought into the foam. Most of them are due to mechanical inclusions entering the foam layer.