Polystyrene foam ceiling for Process Control

Polystyrene foam ceiling process control points:

① The absorption of butane foaming agent as a foaming agent having a boiling point of -5 ℃. In order to ensure adequate absorption of butane PS, must be carried out in an autoclave at elevated temperature and pressure the reaction, the dispersion medium is soft soap powder as a dispersant, to promote uniform dispersion of butane.

Polystyrene foam ceiling for Process Control

Pressure within the autoclave control should be less than 10kg / cm2, at a temperature of 80-90 ℃, then PS soften, butane penetration into the PS. Then incubated 4-12h, PS in the butane content is generally up to a 7.5% to 5.5%. Cooled to below 40 ℃ discharge, obtained after washing the beads can be made of PS.

Due to the distribution in the freshly prepared beads can be made of PS butane absorption is not very uniform, should be stored at low temperatures, a week or even a month, in order to ensure adequate dispersion of butane in the PS, for many small variety of foam core . But the need to prevent butane evaporation.

② common pre-expansion steam directly heating the pre-expanded. PS beads can be made of heated to 80C above begin to soften, the blowing agent vaporization pressure is sufficient to PS foam expansion of the beads, the formation of many closed pores mutually connected in the PS molecule within the pores filled with butane vapor . If using direct steam heating, as well as water vapor in the pores.

Steam heating method of pre-expanded, high production efficiency, continuous foaming. Direct steam heating steam is generally of 20 to 100kPa.

PS foam particles ③ maturing after pre-expansion, mainly within the pores butane and steam, after cooling they will escape or condense out, forming a vacuum within the pores. Thus, the pre-expanded foam particles after the aging treatment shall be subject to the so-called aging treatment is to make PS foam particles stored for a period of time to allow air to penetrate the cell, so that the pressure outside the bubble pressure balance hole, then PS foam particles are elastic obtained.

④ molding construction commonly used in PS foam ceiling, usually with a special molding machine production. After PS foam particles filled cavity plate heated to soften, then heating the air in the bubble hole expansion, prompting the compression bonding between the foam particles and fills the gap between the particles become monolithic tablet. After cooling stereotypes become PS foam board.

PS foam board may be an electric wire cutting, which uses electric wire having a diameter of 0.5-1.0mm, control voltage 5-12V, PS foam sheet can be cut. Of course, an ordinary woodworking tools cutting. Polystyrene has a wide application in our daily life, it is important to pay more attention to polystyrene recycling.