Method for improving filling property of rigid polyurethane foam plastics
A technology of rigid polyurethane and foamed plastics, which can be used in household refrigeration devices, lighting and heating equipment, and other household appliances, etc. It can solve the problems of poor filling performance and low fluidity of rigid polyurethane foamed plastics, and achieve a reduction in filling volume , solve the effect of low flow performance and improve filling performance
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Embodiment 1
[0078] Mix the above-mentioned POL-1: 100 parts, HCFC-141b: 22 parts, and mix with 44V-20L (isocyanate) at the tip of the gun to foam. The measured fiber time is: 55 seconds, and the free rise density is: 24.5kg / m 3 . Foaming in a mold of the same size according to this formula, (mold size: 1900×700×65), using Picture 1-1 The air-entraining method controls the gauge pressure of the foaming cavity and observes the foaming situation. See Table 2 below.
[0079] Table 2
[0080] serial number
P-1
P-2
P-3
P-4
P-5
P-6
P-7
Injection time, seconds
6.12
6.12
6.12
5.5
5.3
5.1
4.83
gauge pressure (MPa),
max
min
0.065
0
0.05
0
0.03
0
0.02
0
0.01
0
0
0
0
-0.019
Filling
from mold
top 17cm,
9% did not
full
from mold top
2.2cm, yes
1.2% uncharged
Full
...
Embodiment 2
[0084] Mix the above POL-5: 100 parts, cyclopentane: 18.5 parts, and foam with 44V-20L. The fiber time is 15 seconds, and the free rise density is 22.8kg / m 3 . Mix the above POL-8: 100 parts, cyclopentane: 18.5 parts, and foam with 44V-20L. The fiber time is 55 seconds, and the free rise density is 23.5kg / m 3 . Use the above formula to foam in a mold of the same size, (mold size: 1850×700×65), using Figure 1-2 The air-entraining method controls the gauge pressure of the foaming cavity and observes the foaming situation.
[0085] table 3
[0086]
P-8
P-9
P-10
P-11
P-12
P-13
Injection time, seconds
3.95
4.54
3.80
4.37
4.54
4.60
gauge pressure (MPa),
max
min
0
0
0
0
0
-0.02
0
-0.02
0.07
0
0
0
Filling
Just fill
15% overfill
exactly charge
fill
...
Embodiment 3
[0091] Take 100 parts of each of the above POL-2, POL-3, POL-4, POL-6, and POL-7, add different foaming agents, react with isocyanate, control the fiber time to 20-23 seconds, and press here The formulation is foamed in a mold of the same size, (mold size: 1850×700×65), using Picture 1-1 The air-entraining method controls the gauge pressure of the foaming cavity and observes the foaming situation.
[0092] Table 4
[0093]
P-14
P-15
P-16
P-17
P-18
P-19
POL-2
100
POL-3
100
POL-4
100
POL-6
100
POL-7
100
100
HFC-365mfc
26
26
(7∶3)
15
15
HFC-245fa
22
22
44V-20L
133
133
133
133
133
133
GT, seconds
3...
PUM
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