Polyol (Raw Material of Polyurethane Foams)

Polyol Used for Refrigerators, Freezers and Showcases

PUFRigid polyurethane insulating foam (polyol) makes a major contribution to sustainability and eco-design by reducing the energy required to keep refrigerators and freezers cold.Polyurethane rigid foam is the insulating material which is most widely used throughout the world for refrigerators and freezers. The insulation efficiency of polyurethane foams is a key property for the low temperature preservation of food during processing, storage and distribution to the consumer. Without polyurethane insulated refrigeration, approximately 50% percent of the world’s food would rot, heavily influencing our daily life and food related business.

Polyurethanes (polyol) are ideal for the insulation of refrigerating appliances and have major advantages as they are:

  • excellent insulators
  • structurally strong thanks to the rigidity of the foam and adhesion of external skins (plastic and metal)
  • the most cost-effective manufacturing solution, with multiple operations combined into one
  • effective in confined spaces, allowing the maximum amount of food to be stored
  • safe
  • robust and strong
  • very light, thus reducing transportation costs
  • affordable, keeping the costs of refrigerators and freezers down

This means that ever more stringent energy standards can be met, with benefits to the consumer through lower energy bills and a reduction in energy used. As shown below, EU energy efficiency initiatives have resulted in considerable energy savings since 1990.

The Insulation Panels - are Rigid Polyurethane Foam Boards which can be also used to insulate walls, discontinuous panels, ceilings, floors etc. of a room, hall, vehicle, compartment etc.

Index of Main Raw Materials for Polyurethane Foams (PUF), Polyol
Table 1

Raw Materials

S.N.

ITEMS

Standard Valude

Polyether

1

Viscosity(mPa·S)

2500~4500

2

Water content(%)

≤2

Isocyanate

1

NCO(%)

30~32

2

Viscosity, 25℃(mPa·S)

150~300

vesicant

F-11/ HCFC-141b

1

Appearance

Colorless and clear without mechanical admixture

2

Water content(%)

≤0.005

3

Purity(%)

≥99.0

Note: Vesicant includes F-11 and HCFC-141b.

Physical and Mechanical Properties of Polyurethane Foams (PUF)
Table 2


ITEMS

UNIT

PROPERTY INDEX

F-11

HCFC-141b

Apparent density

kg / m3

31~33

34~37

Compression strength

kPa

≥100

≥150

Heat transfer coefficient

W/m.K

≤0.022

Water absorption ( V/V )

%

≤5

Close cell content

%

≥90

Dimensional stability under low temp.
(linear shrinkage)

-20℃/ 24h

%

≤1

 

Table 3  Free Manual Foaming Process Parameters of Polyurethane Foams (PUF)

ITEMS

UNIT

PROCESS INDEX

F-11

HCFC-141b

Production periods

Oct- Mar, next year

Apr-Sep

Oct- Mar, next year

Apr-Sep

PUF temp.

20

Cream time

S

12~18

Gel time

S

75~85

85~92

75~85

85~92

none-viscous time

S

100~120

free foaming density

kg / m3

22~25

23~25

Dimensional stability under low temp.

-20℃/ 24h

≤1%

Ambience temp.

20~25

Note: mixing time 8 seconds for manual free foaming, mixing speed1500r/min; the cream time shown in the table includes the mixing time.

 

freezer
Polyols provide outstanding design properties for fridges

Polyols provide not only excellent insulation properties, but offer also outstanding design qualities.  This is because the same material – polyurethane – can be used for both refrigerator housing and insulation.  The only difference is the material's density. Polyurethanes used for refrigerators’ doors enable the manufacturers to produce both parts with just a solid, void-free surface. Polyurethanes prove especially valuable from a design perspective, because with just one application of a surface coating the finish is impeccable. No additional post-finishing is necessary.

 

 

Main Technical Specifications:

 ZL-2204 (Polyol, F-11or R-141b System For refrigerator and freezer)    

1.  GENERAL PROPERTIES AND APPLICATIONS
ZL-2204 is a CFC-11or R-141b blown system used to produce rigid polyurethane foam intended specifically for the insulation of refrigerators and freezers. It contains all the additives necessary for foaming except blowing agent .
The foam system is characterized by:
-------  good flow properties and density distribution
-------  low thermal conductivity
-------  good dimensional stability                    
-------  good adhesion to all facing materials  (preheating of moulds to 40 to   
45° C required)

 2.  ANALYTICAL  DATA
Property                      Value                    units                        Test method
OH-Value                    app. 400             mg  KOH/g         2201-0211001-90D
Water content              app. 2.2                 %                     2201-0212401-90D
Viscosity, 25 ° C          3000-5000         mPas                  2201-0212101-90D
Density,    25 ° C          app. 1.08            g/cm3                       DIN 51757    

3.  GUIDE  FORMULATION
ZL-2204                      100           pbw 
R-11/R-141b               26            pbw
MDI                              126          pbw

4.  LABORATORY  REACTION  PROPERTIES(material temperature at 20℃)
Stirring time                                  8s
Cream time                                   10-13s
Gel time                                        65-75s
Free-rise core density                  24-26 kg/m³

5.  POLYOL FOAM PROPERTIES
6.  POLYOL STORAGE    ... ...
Need more detailed info, please contact us: zhilint@gmail.com

^Go Top

 

 
ZL-6212
(Polyol, F-11or R-141b System For discontinuous panel)

     panel
1.  GENERAL PROPERTIES AND APPLICATIONS
ZL-6212 is a CFC-11or R-141b blown system used to produce rigid polyurethane foam intended specifically for the insulation of high thickness discontinuous panel. It contains all the additives necessaryfor foaming except blowing agent .
The foam system is characterized by:
-------  good flow properties and density distribution
-------  low thermal conductivity
-------  good dimensional stability                    
-------  good adhesion to all facing materials  (preheating of moulds to 40 to 45° C required)

 2.  ANALYTICAL  DATA
Property                       Value                units                   Test method
OH-Value                    app. 400             mg  KOH/g         2201-0211001-90D
Water content              app. 1.9                 %                     2201-0212401-90D
Viscosity, 25 ° C          3000-4500           mPas                2201-0212101-90D
Density,    25 ° C          app. 1.08             g/cm3                   DIN 51757      
 
3.  GUIDE  FORMULATION
ZL-6212                      100          pbw 
R-11                              20          pbw
MDI                              126          pbw

4.  POLYOL LABORATORY  REACTION  PROPERTIES(material temperature at 20℃)
Stirring time                                 10 s
Cream time                                   20-25 s
Gel time                                       125-135 s
Free-rise core density                  30-32 kg/m³     

5.  POLYOL FOAM PROPERTIES
6.  POLYOL STORAGE    ... ...

^Go Top


Need more detailed info, please contact us: zhilint@gmail.com

 
 
Copyright (c) 2000-2016 www.zhilint.com | All Rights Reserved | Email: zhilint@gmail.com