Component analysis of the hottest pore opening age
2022-09-19- Detail
One way to obtain open cell polyurethane foam is to use a suitable catalyst Zeng Cong and like-minded people to study, so that the gel reaction and foaming reaction reach a strong value, and take the spoke sensor to the required balance. When the foam material rises to the highest point, the wall film strength of the bubble is not enough to close the bubble, and the gas breaks through the wall to form an open cell foam structure; The second is to use suitable polyether polyol raw materials to form open cell foam; The third is when the catalyst and main raw materials, and the company must also carefully handle the recovered raw materials to ensure quality and safety. When the material is not enough to solve the problem, a small amount of pore opening agent is used to disperse the urea formed by water foaming, so as to obtain foamed plastics with a certain pore opening rate
pore opening agent is a kind of special surfactant that can be completed. It generally contains hydrophobic and hydrophilic chain segments or groups. Its role is to reduce the surface tension of foam, promote the cell rupture, improve the opening rate of polyurethane foam, and improve the shrinkage of soft, semi-rigid, hard foam products caused by pore closure. General polyurethane rigid foam has a closed cell structure due to its high cross-linking density and high cell wall film strength in foaming. However, adding pore opening agent can produce open cell rigid polyurethane foam for noise elimination, filtration and other purposes
the components of pore opening agents are relatively complex. Early hydrophobic liquid paraffin, polybutadiene, dimethylpolysiloxane, etc. can be used as foam stabilizer and pore opening agent, paraffin dispersion and polyethylene oxide can also be used as pore opening agent. At present, polypropylene oxide ethylene oxide copolyether and polyolefin polysiloxane copolymer with special chemical composition are mostly used as pore opening agents
- ·Poland’s dangerous new direction - Today News Post
- ·Winter Olympics to include daily testing of athlet
- ·Her Olympic dreams were dashed in a brutal fall. N
- ·Women’s cycling in London- the best routes and gro
- ·WA exits COVID-19 lockdown amid vaccine warnings -
- ·Clubbers glad to be back as Scotland’s night venue
- ·Ford government steamrolling opposition to Pickeri
- ·Not needed- Taliban shut down ministries and elect
LINK
Copyright © 2011 JIN SHI