Any mixing method known in the art is suitable and, as far as is known, the order of mixing is not critical. It has been found that, when the crosslinker is the preferred methylvinylcyclo-siloxane, it is convenient to prepare a two-part system wherein part I contains component A and some of component B and part II contains the other components C through E and the remainder of component B such that 2 parts of I are blended with l part of II to form the water block composition.
In order to be within the scope of the present invention, the water block compoition must cure to a non-flowing state and must not exude or drip from a cable filled with the composition. Most preferably, the resultant cured compositions have the consistency of a soft gel which i9 tacky to the touch and is self-healing when penetrated by a solid object, as would occur during cable repair operations. In any event, it is preferred that, when cured, these compositions be non-flowing to the extent that a one-foot section of cable which has been filled with the water block does not exude or drip when held vertically for one hour at C.
Typical compositions of this invention comprise from about 10 to parts by weight of component A , from about 10 to parts by weight of component B , from about 0.
The exact relative amounts of components A , B and C to be used are determined by routine experimentation to provide the desired final cured properties described above.
Preferably, the molar ratio of Si-H functionality to unsaturated radical i. Such systems do not ordinarily lend themselves to precise formulation by a prescribed recipe. Thus, one such embodiment consists of about parts by weight of component A , in which R is methyl and x is about 15, about 54 parts by weight of component B , in which R" is methyl and y is about 7, and about 0.
To this mixture, the preferred inhibitor, bis 2-methoxymethylethyl maleate, may be added in such proportion that the weight ratio of inhibitor E to catalyst D varies from zero to about 0. Thi6 type of cable comprises a conductor which is formed from multiple wires or other conductors twisted or braided together to form the conductor.
The conductor is covered with an insulating material. In such configurations, the conductor portion of the cable contains voids between the multiple braided or twisted conductors running the full length of the cable.
These voids allow moisture to migrate thrbugh the cable which contributes to the above discussed treeinq processes throughout the cable. The water block compositions of the present invention are used to fill the interstices of the conductor portion of the cable, thereby preventing this water migration.
The polyolefins include solid polymers of olefins, particularly alpha-olefins, which comprise from about two to six carbon atoms. Specific examples of these insulating material include crosslinkable and non-cross-linkable polyethylene, polypropylene, polybutene, polyiso-butylene, poly 4-methyl pentene and the like.
Copolymers of ethylene, and other compounds interpolymerizable with ethylene, such as butene-l, pentene-l, propylene, styrene, and the like, may also be employed. In general, the copolymer will comprise more than 50 per cent by weight of ethylene units.
Suitable examples of olefin-vinyl copolymers include those of ethylene-vinyl acetate, ethylene-vinyl propionate, ethylene-vinyl isobutyrate, ethylene-vinyl alcohol, ethylene-methyl acrylate, ethylene-ethyl acrylate, ethylene-ethyl methacrylate, and the like. Specific examples o olefin-allyl copolymers include ethylene-allyl benzene, ethylene-allyl ether and ethylene-acrolein. However, the preferred polymer insulation is polyolefin, the mQst preferred being polyethylene. One of the chief advantages of the present invention is that the water block can be supplied to the interstices of the cable after the insulation material has been extruded onto the conductor, but before the cable is placed in service.
For instance, cable on spools can be filled with the water block compositions of the present invention in the factory. The water block composition can be supplied to the cable by either pumping the material through the interstices of the stranded conductor portion of the cable, or by drawing the composition through the cable by applying a vacuum to one end of the cable and providing a supply of the water block composition at the opposite end.
Such methods are well known in the art and up to about 5, feet of cable can be filled with the compositions of this invention at a time using these procedures. Thi8 process is repeated till the entire cable is filled with the water block composition. Again, these methods are well known in the art. In each case, the water block composition should be mixed just before being used to fill a cable. In particular, and as discussed above, the catalyst should not be combined with a mixture of Si-H functional fluid and Si-G functional fluid until the water block material is ready to be supplied to the cable.
The following examples are offered to assist those skilled in the art to better understand the invention. The examples presented are not meant to delineate the scope of the invention, which is defined in the appended claims. B 54 grams of fluid comprised of vinyl endblocked polydimethylsiloxane of the general formula Me Me vi - sio ysi-v Me Me wherein Vi denotes the vinyl radical and y is on average about 7. Thi8 fluid had a flash point of F, a viscosity of 4. The initial viscosity of the fluid upon mixing was less than 10 cs.
The platinum catalyst and the inhibitor were mixed with the vinyl endblocked fluid before being blended with the Si-H endblocked fluid. This composition cured into an elastomer within several days after being mixed upon storage at 25C. Table 1 shows the actual data points. Several mixture having varying amounts of the inhibitor component E were prepared using the ingredients of Example 1 wherein the ratios of components A through C was essentially the same as in Example 1 and the platinum concentration was held at 31 ppm based on actual platinum in the system.
Table 2 shows the actual data points. Catalyst Hours to Double Viscosity 1. The composition has a low viscosity and comprises A an Si-H endblocked polydiorganosiloxane fluid, B a polydiorgano-siloxane fluid endblocked with an unsaturated organic radical, C a siloxane crosslinker, D a hydrosilation catalyst and E a polymerization inhibitor.
Proper selection of catalyst and inhibitor concentrations imparts a controllable viscosity-time profile to the composition and allows cables of various sizes and lengths to be filled before the water block composition cures. Samples Find a Store. Inspiration Photo Gallery Design a Room. See All Rigid Core.
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