Compounding filled silicone compositions
A technology of siloxane and composition, which is applied in the field of mixing heat vulcanizable siloxane composition, and can solve problems such as high torque and high temperature
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0060] figure 1 The apparatus and method 10 of the present invention are shown. exist figure 1 Among them, the D4-treated fumed silica is installed in the addition funnel 12, and is metered into the upstream section of the co-rotating intermeshing twin-screw extruder (L / D=42) 16 at 14. Filler is added to extruder 16 at 14 (barrel 1) and process fluid 18 is added at 20 (barrel 1). The processing fluid was a mixture of silanol terminated polydimethylsiloxane, vinyl terminated dimethyl-methylvinylsiloxane, and hydroxyl terminated polydimethyl-methylvinylsiloxane. The silicone polymers 22, 24 are added at the same rate at two locations (barrels 8 and 9) 26, 28. Air and excess volatiles entrained in the fumed silica are removed through outlets 30 and 32 (bowls 11 and 13).
[0061] The extruder 16 comprises a conveying section 34 (barrel 1 to barrel 6), a kneading section 36 for distributive and dispersive mixing (barrel 7 to barrel 10), a screw jacket for degassing and devolati...
Embodiment 2
[0086] repeat figure 1 The method shown, except that a vacuum is applied at outlet 32 (barrel 13 ) allows easy drainage of residual volatiles (moisture, unpolymerized monomer, and solvent). Using a pair of bubble rings (barrel 12) inside the screw, the outlet 32 (barrel 13) Isolation.
[0087] The operating conditions, feedstocks, and physical properties of the cured samples are shown in Table 2 (Experiments 1007-1009). The temperature was adjusted to 189°C (first barrel), 150°C (barrels 2-5), and 175°C (barrel 6 to end). For 1007, in order of barrels, the recorded temperatures of barrels are 28, 153, 163, 144, 149, 175, 172, 191, 189, and 175°C, and for 1008, they are 29, 162, 154, 156, 152, 174, 175, 191, 194, and 174°C.
[0088] Table 2
[0089] Properties / specimen 1007 1008 1009
[0090] Treated fumed silica (weight %) 21( * ) 28.3( * ) 29( * )
[0091] Pretreated fumed silica (lb / h) 7.4 8.57 8.57
[0092] Processing fluid (lb...
Embodiment 3
[0104] figure 2 Another embodiment of the invention is shown. figure 2 A method and apparatus 40 is shown in which no filler-polymer concentrate or pretreated silica is used to prepare a silicone composition. exist figure 2 Among them, fumed silicon dioxide raw material 42, HMDZ 44, and deionized water 46 are respectively fed into the forwardly rotating intermeshing twin-screw extruder through 48, 50, and 52 (barrel 1) at the first position 54 (L / D=42). Process fluid, treatment agent, flow enhancer, and reactant 56 for the second treatment packing are added through 58 (barrel 7) and vinylsiloxane polymer is added at the same rate through 62 (barrel 8 and 9) 60. The processing fluid solution was 1.21 parts of silanol terminated polydimethylsiloxane, 1.82 parts of vinyl terminated dimethyl-methylvinylsiloxane, and 0.12 parts of hydroxyl terminated polydimethyl-methyl Vinyl siloxane mix formulated (in pounds). Nitrogen 64 was added via 66 to the bottom of the packing sid...
PUM
| Property | Measurement | Unit |
|---|---|---|
| hardness | aaaaa | aaaaa |
| elongation at break | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More