Silicone surfactant for preparing soft moulded foamed polyurethane body
A surfactant, polyurethane flexible technology, applied in the field of polyurethane flexible molded foam
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Embodiment 1
[0066] According to the procedure disclosed in U.S. Patent 4,031,044, the silicone polyether copolymer surfactants in Table 1B were prepared, including: in the presence of a hydrosilylation catalyst, trimethylformazan having the following general formula Siloxy-terminated polydimethylsiloxane-polymethylhydridosiloxane copolymer:
[0067] Me 3 Si(OSiMe 2 ) x (OSiMeH) y OSiMe 3 with the molecular formula CH 2 -CHCH 2 [OCH(CH 3 )CH 2 ] 2 OCH 3 The unsaturated polyether reacts.
[0068]The silicone polyether copolymer surfactant was prepared as follows: A 3 neck round bottom flask was equipped with a reflux condenser, air mechanical stirrer and a thermometer with heat monitoring. The thermometer socket is fitted with a sidearm gas inlet barb which is connected to a controlled source of nitrogen gas. The above-mentioned trimethylsiloxy-terminated polydimethylsiloxane-polymethylhydridosiloxane copolymer (values of x and y are listed in Table 1B below) ...
Embodiment 2
[0091] Premix the polyols listed in Formulation B and store in a container thermostatted at 70-73°F (21-23°C). Likewise, a single mixture of water, crosslinker and amine catalyst was also prepared. Foams are typically prepared by first mixing the polyol and surfactant at 6000 rpm in a 1 / 2 gallon (1890 ml) paper cup using a Servodyne disperser with a 3 inch (7.6 cm) disc mixing blade for 20 Second. The same paper cup was then filled with the water-amine mixture and mixed for an additional 20 seconds at 6000 rpm. Next, TDI was added to the paper cup and mixed for 5 seconds. Finally, inject all the materials in the cup into a five-hole aluminum mold with a size of 12×12×4 inches (30×30×10cm) and a temperature of 155°F (68°C) within 5 seconds, using PRC-798 The release agent is pretreated. Close the mold quickly. After 330 seconds, the foam gasket was removed from the mold and crushed by hand using a metal disc, just to observe the vent holes and surfaces. Measure the crushi...
Embodiment 3
[0097] Adopt formula A to replace formula B, carry out the operating steps of embodiment 2.
[0098] Silicone table
surfactant
x / y
x+y
Dosage
(pphpp) *
initial
FTC (lb; N)
volume
stability
surface properties
A
1
2
0.06
142；636
1.65
1
B
3
2
0.06
128；573
1.65
1.5
B
3
2
0.4
104；465
4.25
4.5
D
3
6
0.06
212；950
4.25
4.5
E
1
6
0.06
129；578
2
1.5
G1
2.08
4
0.06
122；547
1.25
4
Q
2
6.8
0.06
222；995
4.5
4.5
R
3.41
4
0.06
116；520
1.1
3
S
...
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Abstract
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