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EPS resin production process
The one-step and two-step production methods mentioned above, the difference between them is the method to add foaming agent: The styrene polymerization and foaming agent impregnation are operated in the same reacting kettle, that is called one-step method : While the styrene polymerization and foaming agent impregnation are separately operated in different kettle ,that is called two-step method. 

The following is the process flow chart of one-step and two-step,1-1,2-2 

(One) Two-step way to produce EPS
1.recipy for polymerizing

Component

quantity

Component

quantity

Styrene

100

  water              

160

BPO           

0.35

t-BPB              

0.07

TCP           

0.05-0.15

hydroxyethyl cellulose       

0.1-0.2

Soap powder    

2-8

digestant agent             

0.1

Expanding agent 

7-12

 

 

(2)EPS component of flame retardant

Component

quantity

Component

quantity

Styrene

100

Water

160

BPO

0.35

t-BPB

0.07

Dicumyl peroxide

0.2~0.3

PVA

2~4

Soap powder

2~8

Digestant

0.1

Flame retardant

0.4~1.2

Antioxidant

0.2~0.5

Foaming agent

7~12

 

 

 
 
 
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