Method of producing composite sheet having polyolefin foam layer
The composite sheet of polyolefin-based resin foam layer and polymeric antistatic agent surface layer is prepared by die co-extrusion method, which solves the problems of unstable antistatic property and poor durability in the existing technology, and achieves the ability to maintain resistance under humidity changes. Static properties and improved flexibility and cushioning properties.
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Embodiment 1
[0090] The first melt for the foam layer was formed using two extruders with internal diameters of 90 mm and 120 mm and arranged in tandem. The second melt for the surface layer was formed using an extruder having an inner diameter of 65 mm and a screw length / diameter ratio (L / D) of 46. Connect the extruder with the three-layer circular die. Incidentally, the diameter of the lip was 95 mm.
[0091] The density of 100 parts is 922kg / m 3, low-density polyethylene (LDPE[a]) with a melt viscosity of 850 Pa·s and a crystallization temperature [Tc] of 95.8° C. (trade name: NUC8321, manufactured by Nippon Unicar Co., Ltd.) and 3 parts of a cell control agent master Material (I) was charged into an extruder having a diameter of 90 mm and heated and kneaded to obtain a molten mixture at about 200°C. Under certain pressure, add 16 parts of a mixed foaming agent consisting of 70% n-butane and 30% isobutane (for the sake of simplicity, the following table refers to [butane]) to this mi...
Embodiment 2
[0095] Repeat Example 1 in the same way as above, except that the consumption of foaming agent is reduced from 16 parts to 13 parts, and the density is 917kg / m 3 , low-density polyethylene (LDPE[b]) (trade name: NUC8008, manufactured by Nippon Unicar Co., Ltd) having a melt viscosity [Ma] of 640 Pa·s and a crystallization temperature of 93.5°C was used instead of the first layer for forming the surface layer. LDPE [a] in the second melt and adjust the temperature [T2] of the second melt to 115°C, as shown in Table 1.1. The composite sheet has a thickness of 1 mm and two surface layers each having a thickness of 2.3 μm.
Embodiment 3
[0097] Repeat Example 1 in the same way as above, except that the density is 916kg / m 3 , low-density polyethylene (LDPE[c]) (trade name: NUC800, manufactured by Nippon Unicar Co., Ltd.) having a melt viscosity [Ma] of 460 Pa·s and a crystal temperature of 913°C was used instead of the second layer forming the surface layer. LDPE [a] in the melt, increase the amount of pore size control agent masterbatch (I) to 5 parts and adjust the temperature [T1] and [T2] of the first and second melt to 107°C and 109°C, respectively °C, as shown in Table 1.1.
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