Silane crosslinkable polymer composition
A polymer, composition technology, applied in the direction of plastic/resin/wax insulators, organic insulators, electrical components, etc.
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Embodiment 2
[0270] Ethylene-vinyltrimethoxysilane copolymer (polymer D) was produced in a 660 m long split high pressure tubular reactor (Union Carbide A-1 type). The inner wall diameter is 32mm. Chain transfer agent (propylene), initiator (t-butylperoxy 2-ethylhexanoate (Luperox 26) and air) and comonomers were added to the reactor system in the conventional manner. Ethylene-vinyltrimethoxysilane copolymer polymer D was produced in a tubular reactor at a maximum temperature of 310 °C and 230 MPa. To regulate MFR 2.16, using propylene as the chain transfer agent. The VTMS feed was adjusted to produce a copolymer containing 0.072 mol / kg polymer VTMS. The amount, density and MFR of vinyltrimethoxysilane units (VTMS, = units containing one or more silane groups) are given in Table 3 2
[0271] Insulated cable samples of 1.2 mm of the produced polymer were prepared as described in "Cable Samples for Heat Curing Elongation and Elongation at Break" in "Determination Methods". Before extru...
Embodiment 3 and 4
[0278] Ethylene-vinyltrimethoxysilane copolymers (Polymers E and F) similar to Polymer D were produced in the same tubular reactor as described in Inventive Example 2 using a maximum temperature of 310 °C and 230 MPa . To regulate MFR 2.16 , using propylene as the chain transfer agent. The VTMS feed was adjusted to produce copolymers containing 0.055 and 0.047 mol / kg polymer VTMS. The amount, density and MFR of vinyltrimethoxysilane units (VTMS, = units containing one or more silane groups) are given in Table 4 2
[0279] Insulated cable samples of 1.2 mm of the produced polymer were prepared as described in "Cable Samples for Heat Curing Elongation and Elongation at Break" in "Determination Methods". Before extrusion, 5wt% low-density polyethylene (MFR 2 =2, density 923kg / m 3 ) of a catalyst masterbatch (CMDBSA) containing 1.7 wt% of dodecylbenzenesulfonic acid as a crosslinking catalyst and 2 wt% of Irganox 1010 as a stabilizer was dry blended into the silane copolymer...
Embodiment 5
[0286] To determine the final heat cure level, polymers A-F were prepared as described in "Determination Methods" under "Cable Samples for Heat Cured Elongation and Elongation at Break". Polymer C (ethylene-vinyltrimethoxysilane copolymer) was prepared similarly to Polymer D, but the VTMS feed was adjusted to obtain a final VTMS content of 0.088 mol / kg polymer. The resulting cable samples were crosslinked in water at 90° C. for 20 hours, after which the thermal cure elongation was measured. All samples have MFR between 0.9 and 1.0 2.16 .
[0287] Table 4
[0288]
[0289] In the following figure 1 The VTMS content is plotted against the heat set elongation of the fully cured samples in .
[0290] figure 1 It is shown that, for the non-inventive copolymers, the final heat set elongation is below 30% and lies in the region where increasing silane content has very little effect on the final heat set elongation. On the other hand, the copolymers of the present invention h...
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