CA2066470C - Liquid electrical tape formulation - Google Patents
Liquid electrical tape formulationInfo
- Publication number
- CA2066470C CA2066470C CA002066470A CA2066470A CA2066470C CA 2066470 C CA2066470 C CA 2066470C CA 002066470 A CA002066470 A CA 002066470A CA 2066470 A CA2066470 A CA 2066470A CA 2066470 C CA2066470 C CA 2066470C
- Authority
- CA
- Canada
- Prior art keywords
- formulation
- vinyl
- present
- amount
- plasticizer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000000203 mixture Substances 0.000 title claims abstract description 86
- 238000009472 formulation Methods 0.000 title claims abstract description 80
- 239000007788 liquid Substances 0.000 title claims abstract description 30
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims abstract description 31
- 229920002554 vinyl polymer Polymers 0.000 claims abstract description 31
- 239000004014 plasticizer Substances 0.000 claims abstract description 18
- 239000003381 stabilizer Substances 0.000 claims abstract description 18
- 239000011248 coating agent Substances 0.000 claims abstract description 16
- 238000000576 coating method Methods 0.000 claims abstract description 16
- 239000013008 thixotropic agent Substances 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 14
- 239000002904 solvent Substances 0.000 claims abstract description 10
- 238000001035 drying Methods 0.000 claims abstract description 4
- 239000002274 desiccant Substances 0.000 claims abstract description 3
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 claims description 33
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 33
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 claims description 21
- MQIUGAXCHLFZKX-UHFFFAOYSA-N Di-n-octyl phthalate Natural products CCCCCCCCOC(=O)C1=CC=CC=C1C(=O)OCCCCCCCC MQIUGAXCHLFZKX-UHFFFAOYSA-N 0.000 claims description 10
- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical group CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 claims description 10
- 239000004593 Epoxy Substances 0.000 claims description 9
- 229920001577 copolymer Polymers 0.000 claims description 5
- 238000006116 polymerization reaction Methods 0.000 claims description 3
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical group ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 claims description 2
- 239000002253 acid Substances 0.000 claims description 2
- 230000002028 premature Effects 0.000 claims description 2
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical group CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 claims 1
- 229920001169 thermoplastic Polymers 0.000 claims 1
- 239000004416 thermosoftening plastic Substances 0.000 claims 1
- 229920013620 Pliolite Polymers 0.000 description 7
- 229920006163 vinyl copolymer Polymers 0.000 description 6
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 229920002689 polyvinyl acetate Polymers 0.000 description 3
- 239000011118 polyvinyl acetate Substances 0.000 description 3
- 239000004800 polyvinyl chloride Substances 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- NEHMKBQYUWJMIP-UHFFFAOYSA-N chloromethane Chemical compound ClC NEHMKBQYUWJMIP-UHFFFAOYSA-N 0.000 description 2
- 238000004040 coloring Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 239000002270 dispersing agent Substances 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 239000000454 talc Substances 0.000 description 2
- 229910052623 talc Inorganic materials 0.000 description 2
- KUBDPQJOLOUJRM-UHFFFAOYSA-N 2-(chloromethyl)oxirane;4-[2-(4-hydroxyphenyl)propan-2-yl]phenol Chemical compound ClCC1CO1.C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 KUBDPQJOLOUJRM-UHFFFAOYSA-N 0.000 description 1
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical group CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 1
- 235000010469 Glycine max Nutrition 0.000 description 1
- 244000068988 Glycine max Species 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical group Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 1
- 229920001756 Polyvinyl chloride acetate Polymers 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000004359 castor oil Substances 0.000 description 1
- 235000019438 castor oil Nutrition 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- ZEMPKEQAKRGZGQ-XOQCFJPHSA-N glycerol triricinoleate Natural products CCCCCC[C@@H](O)CC=CCCCCCCCC(=O)OC[C@@H](COC(=O)CCCCCCCC=CC[C@@H](O)CCCCCC)OC(=O)CCCCCCCC=CC[C@H](O)CCCCCC ZEMPKEQAKRGZGQ-XOQCFJPHSA-N 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000004850 liquid epoxy resins (LERs) Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229940050176 methyl chloride Drugs 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 125000005498 phthalate group Chemical class 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- -1 vinyl compound Chemical class 0.000 description 1
Landscapes
- Organic Insulating Materials (AREA)
- Paints Or Removers (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
A quick drying liquid electrical tape formulation having good shelf life. The formulation forms a durable vinyl coating or film on wires, junctions and objects. The formulation is comprised of at least 10% of a vinyl material effective to achieve the durable vinyl coating. The formulation further includes a thixotropic agent to add body, and a plasticizer to impart flexibility to the vinyl coating. The vinyl material, thixotropic agent and plasticizer are admixed with solvents comprising at least one drying agent. The formulation further including a stabilizing agent and at least one solvent, such that the thixotropic agent and plasticizer enable the application of a satisfactory coating using the formulation.
Description
4 ~ ~
SPECIFICATION
BACKGROUND OF THE INVENTION
This invention relates to a liquid electrical tape formulation and more particularly, to a liquid electrical tape formulation that is vinyl resin based and which is solubilized into a mixture of organic solvents, and further includes a thixotropic agent, a plasticizer and a stabilizer, preferably an epoxy stabilizer.
Liquid electrical tape formulations have been developed in recent years to achieve an insulating coating, for instance, for protecting electrical connections, although such formulations have uses that range far beyond electrical connections, namely, to any object or area where an insulating or protective coating is desired, particularly where it is difficult to use conventional insulating tape.
A particular field where liquid electrical tape formulations have become popular, is in the marine or boating field.
However, it has been determined that the liquid electrical tape formulations heretofore known tended either to have poor spreading or film forming characteristics or tended to become brittle after application as time goes by.
Yet another problem with prior liquid electrical formulations is that of shelf life. Long shelf life has been difficult to obtain since prior liquid electrical tape formulations normally had the property of quick hardening.
Thus, such formulations would tend to set, harden or polymerize in the container.
B
SPECIFICATION
BACKGROUND OF THE INVENTION
This invention relates to a liquid electrical tape formulation and more particularly, to a liquid electrical tape formulation that is vinyl resin based and which is solubilized into a mixture of organic solvents, and further includes a thixotropic agent, a plasticizer and a stabilizer, preferably an epoxy stabilizer.
Liquid electrical tape formulations have been developed in recent years to achieve an insulating coating, for instance, for protecting electrical connections, although such formulations have uses that range far beyond electrical connections, namely, to any object or area where an insulating or protective coating is desired, particularly where it is difficult to use conventional insulating tape.
A particular field where liquid electrical tape formulations have become popular, is in the marine or boating field.
However, it has been determined that the liquid electrical tape formulations heretofore known tended either to have poor spreading or film forming characteristics or tended to become brittle after application as time goes by.
Yet another problem with prior liquid electrical formulations is that of shelf life. Long shelf life has been difficult to obtain since prior liquid electrical tape formulations normally had the property of quick hardening.
Thus, such formulations would tend to set, harden or polymerize in the container.
B
OBJECTS OF THE INVENTION
Accordingly, it is a principal object of the present invention to provide a liquid electrical tape formulation, possessing all of the desirable features of a liquid electrical tape formulation, but yet also having significant shelf life.
Yet another object of the present invention is to provide a liquid electrical tape formulation which can be brushed on or dipped onto various types of electrical connections, objects and other areas to be protected.
Still another object of the present invention is to provide a liquid electrical tape formulation that quickly dries to a tough, yet flexible, ultraviolet resistant, dielectric coating which seals out dirt, moisture and water, thereby preventing corrosion.
Yet another object of the present invention is to provide a liquid electrical tape formulation that forms a protective dielectric coating of flexible vinyl material.
A further object of the present invention is to provide a liquid electrical tape formulation that adheres to metal, plastic, vinyl, rubber and composite surfaces.
Still another object of the present invention is to provide a liquid electrical tape which will hold wires and terminals together, thereby preventing loose connections due to vibration.
A further object of the present invention is to provide an economical liquid electrical tape that is safe and easy to use and is also fast drying.
Accordingly, it is a principal object of the present invention to provide a liquid electrical tape formulation, possessing all of the desirable features of a liquid electrical tape formulation, but yet also having significant shelf life.
Yet another object of the present invention is to provide a liquid electrical tape formulation which can be brushed on or dipped onto various types of electrical connections, objects and other areas to be protected.
Still another object of the present invention is to provide a liquid electrical tape formulation that quickly dries to a tough, yet flexible, ultraviolet resistant, dielectric coating which seals out dirt, moisture and water, thereby preventing corrosion.
Yet another object of the present invention is to provide a liquid electrical tape formulation that forms a protective dielectric coating of flexible vinyl material.
A further object of the present invention is to provide a liquid electrical tape formulation that adheres to metal, plastic, vinyl, rubber and composite surfaces.
Still another object of the present invention is to provide a liquid electrical tape which will hold wires and terminals together, thereby preventing loose connections due to vibration.
A further object of the present invention is to provide an economical liquid electrical tape that is safe and easy to use and is also fast drying.
BRIEF STATEMENT OF INVENTION
The foregoing as well as other objects of the invention are achieved by providing a liquid electrical tape formulation that was originally developed for the boat building industry where electrical connections are continuously exposed to vibration and moisture or, in some cases, are actually under water. In such harsh environment, standard electrical tape or shrink tubing does not perform well and can actually promote corrosion by allowing water to be trapped around electrical connections.
Moreover, standard electrical tape or shrink tubing cannot be used on very thin wiring, screw terminals or difficult to reach connections.
Examples of usage of the liquid electrical tape formulation of the present invention include bilge pumps, outdoor exposed wiring, sprinkler pumps, timers, underground wiring, outdoor lighting fixtures, instruments, computers and other places where a weatherproof and dependable connection is needed or where irregular shapes are involved.
In the preferred embodiment of the present invention, the liquid electrical tape formulation is a vinyl resin that is solubilized into a mixture of organic solvents, with the further presence of a thixotropic agent, a plasticizer and a stabilizer, preferably an epoxy stabilizer.
DESCRIPTION OF PREFERRED EMBODIMENT
The foregoing basic formulation is preferably comprised of a copolymer of vinyl compounds, namely, polyvinyl chloride and polyvinyl acetate wherein the polyvinyl chloride is present in a significant majority amount. For ease of reference, these and other polyvinyl materials will 0 ~
The foregoing as well as other objects of the invention are achieved by providing a liquid electrical tape formulation that was originally developed for the boat building industry where electrical connections are continuously exposed to vibration and moisture or, in some cases, are actually under water. In such harsh environment, standard electrical tape or shrink tubing does not perform well and can actually promote corrosion by allowing water to be trapped around electrical connections.
Moreover, standard electrical tape or shrink tubing cannot be used on very thin wiring, screw terminals or difficult to reach connections.
Examples of usage of the liquid electrical tape formulation of the present invention include bilge pumps, outdoor exposed wiring, sprinkler pumps, timers, underground wiring, outdoor lighting fixtures, instruments, computers and other places where a weatherproof and dependable connection is needed or where irregular shapes are involved.
In the preferred embodiment of the present invention, the liquid electrical tape formulation is a vinyl resin that is solubilized into a mixture of organic solvents, with the further presence of a thixotropic agent, a plasticizer and a stabilizer, preferably an epoxy stabilizer.
DESCRIPTION OF PREFERRED EMBODIMENT
The foregoing basic formulation is preferably comprised of a copolymer of vinyl compounds, namely, polyvinyl chloride and polyvinyl acetate wherein the polyvinyl chloride is present in a significant majority amount. For ease of reference, these and other polyvinyl materials will 0 ~
be referred to as "vinyl" or "vinyl material". The second component of the present invention is a thixotropic agent, the third component is a plasticizer and the fourth component is a stabilizer. Also, in the preferred embodiment there is a mixture of three solvents, namely methyl ethyl ketone, toluene and methylene chloride.
A preferred formulation in accordance with the present invention is in weight percentages:
1) vinyl copolymer (23.68%) - VYHH
2) AC 4 Pliolite (1.52%) - thixotrope (Pliolite is a trade mark) 3) Dioctyl phthalate (9.31%) - plasticizer 4) epoxy stabilizer (ERL 42-21 (Union Carbide)) (5%) (ERL is a trade mark) 5) methyl ethyl ketone (38.5296) 6) toluene (13.88%) 7) methylene chloride (13.10%) The first component is preferably a mixture of vinyl compounds, since the film forming protective features for satisfying the objectives of the invention basically flow from the presence of at least one vinyl compound. A
preferred vinyl copolymer is identified as VYHH that is made by the Union Carbide Company. The VYHH is a vinyl copolymer that is a basic coating agent which provides good adhesion.
It should be understood that other vinyl materials may be employed in the present formula. The VYHH copolymer is composed of 86% by weight of polyvinyl chloride units and 14% by weight of polyvinyl acetate units. It has an approximate specific gravity of 1.36 and is normally presented in a solid granular form that is readily soluble in solvents used with the present invention. This will be covered in the method of preparing the formulation of the present invention. If the vinyl component is substantially -- 5 - ~ 7 ~
entirely vinyl chloride, the vinyl component will be less soluble in the other components, particularly, the solvents and will also be too crystalline. The presence of some polyvinyl acetate will facilitate the formation of a good clear solution in the overall formulation.
The percentage of the vinyl copolymer component may vary from about 10% to 60% by weight of the total mix.
However, the preferred amount is about 25% by weight. This amount will contribute sufficient vinyl material to make for a durable film of protective vinyl on the wire or junction or article to which the formulation of the present invention is applied.
The next ingredient is thixotropic agent, exemplified by AC 4 Pliolite (manufactured by the Goodyear Corporation of Akron, Ohio) which may vary in the preferred liquid electrical tape formulation from about 1% to 2% by weight.
The AC 4 Pliolite is manufactured by the Goodyear Company.
Other compatible thixotropic agents may be used in place of the specific AC 4 Pliolite. AC 4 Pliolite is a modified vinyl toluene acrylate copolymer having a melting point of 54~C and a specific gravity of 2.08. The purpose of the thixotropic agent is to lend body or thickness to the overall liquid electrical tape formulation. This will bring about not only better film forming properties, but more importantly, will prevent the formulation from running.
Rather, the formulation will tend to adhere to the surface to which it has been applied. If too much thixotropic agent is used, the overall formulation will not pour well. If too little is used, the formulation may be thin and runny.
Examples of other thixotropic agents that will function satisfactorily in the present formulation are organic clays, fumed silicas and aluminum compounds.
- 6 ~
The next component is a plasticizer exemplified by dioctyl phthalate. This plasticizer affords to the dried or set liquid electrical tape formulation, the property of being flexible. Thus, the finished or set "tape" will not crack or separate under the force of vibration. The plasticizer may vary in the preferred liquid electrical tape formulation from about 5% to 15% by weight. If too much plasticizer is used, the formulation will "weep" as the plasticizer migrates to the surface. Examples of other plasticizers that will function satisfactorily in the present formulation are castor oil, other phthalates and soy bean based plasticizers.
It is important that the ratio of vinyl component to dioctyl phthalate or other plasticizer be in the vicinity of 2.5:1 Increases beyond this ratio will result in a relatively rigid final coating that will fracture and separate from the substrate on which the liquid electrical tape formulation is coated. Should the ratio drop to 2:1 or less, then the formulation may not harden well.
Then, there is the stabilizer exemplified by the epoxy stabilizer. The preferred epoxy stabilizer is known as ERL
42-21 and is made by Union Carbide Co. It is preferred that this stabilizer be present in an amount of about 5% in the overall formulation. Another epoxy stabilizer, used in an amount of about 3% in the overall formulation is made by Shell Corporation and is known as Shell Epon 828 (Epon is a trade mark). It has been determined that the formulation of the present invention without the stabilizer will in storage at elevated temperatures, tend to release acid which will interact with the inside surface of a metal container.
These in turn will initiate unwanted polymerization of the vinyl copolymer. The epoxy stabilizer is comprised of one or more functional liquid epoxy resins and may vary in the . ~ ~ . .. . .. . . . .. . ..
preferred liquid electrical tape formulation from about 1/2%
to 6% by weight. Non-epoxy stabilizers, compatible with other ingredients in the present formulation may be used to prevent premature polymerization of the formulation.
Finally, there are the solvents. Toluene is present because it is a very effective drying agent. However, it is a significantly flammable product whose flammability is controlled with the presence of the methylene chloride component. There is also a significant amount of methyl ethyl ketone in the preferred formulation as it is an effective solvent for both the vinyl component and the thixotropic agent to keep these two components in solution.
Also, methyl ethyl ketone affords additional quick drying properties to the overall formulation although it is quite flammable.
The preferred range of methyl ethyl ketone is from about 20% to 40% by weight. When the levels of methyl ethyl ketone are reduced to a level of approximately 20% it would be near impossible to keep the vinyl and rubber based resin in solution and you would get a seeding out or thickening of a percentage of the mass. When the level of the methyl ethyl ketone is increased over 40%, a dramatic increase in the dry rate will be noted and stability in small quantities will be reduced significantly.
The preferred range of toluene is from about 10% to 15%
by weight. If the amount of toluene exceeds 20%, the overall formulation will "skin" immediately and/or flash too quickly. It may even dry on the brush. Where toluene falls to less than about 10%, the vinyl component could precipitate out of solution.
B
A preferred formulation in accordance with the present invention is in weight percentages:
1) vinyl copolymer (23.68%) - VYHH
2) AC 4 Pliolite (1.52%) - thixotrope (Pliolite is a trade mark) 3) Dioctyl phthalate (9.31%) - plasticizer 4) epoxy stabilizer (ERL 42-21 (Union Carbide)) (5%) (ERL is a trade mark) 5) methyl ethyl ketone (38.5296) 6) toluene (13.88%) 7) methylene chloride (13.10%) The first component is preferably a mixture of vinyl compounds, since the film forming protective features for satisfying the objectives of the invention basically flow from the presence of at least one vinyl compound. A
preferred vinyl copolymer is identified as VYHH that is made by the Union Carbide Company. The VYHH is a vinyl copolymer that is a basic coating agent which provides good adhesion.
It should be understood that other vinyl materials may be employed in the present formula. The VYHH copolymer is composed of 86% by weight of polyvinyl chloride units and 14% by weight of polyvinyl acetate units. It has an approximate specific gravity of 1.36 and is normally presented in a solid granular form that is readily soluble in solvents used with the present invention. This will be covered in the method of preparing the formulation of the present invention. If the vinyl component is substantially -- 5 - ~ 7 ~
entirely vinyl chloride, the vinyl component will be less soluble in the other components, particularly, the solvents and will also be too crystalline. The presence of some polyvinyl acetate will facilitate the formation of a good clear solution in the overall formulation.
The percentage of the vinyl copolymer component may vary from about 10% to 60% by weight of the total mix.
However, the preferred amount is about 25% by weight. This amount will contribute sufficient vinyl material to make for a durable film of protective vinyl on the wire or junction or article to which the formulation of the present invention is applied.
The next ingredient is thixotropic agent, exemplified by AC 4 Pliolite (manufactured by the Goodyear Corporation of Akron, Ohio) which may vary in the preferred liquid electrical tape formulation from about 1% to 2% by weight.
The AC 4 Pliolite is manufactured by the Goodyear Company.
Other compatible thixotropic agents may be used in place of the specific AC 4 Pliolite. AC 4 Pliolite is a modified vinyl toluene acrylate copolymer having a melting point of 54~C and a specific gravity of 2.08. The purpose of the thixotropic agent is to lend body or thickness to the overall liquid electrical tape formulation. This will bring about not only better film forming properties, but more importantly, will prevent the formulation from running.
Rather, the formulation will tend to adhere to the surface to which it has been applied. If too much thixotropic agent is used, the overall formulation will not pour well. If too little is used, the formulation may be thin and runny.
Examples of other thixotropic agents that will function satisfactorily in the present formulation are organic clays, fumed silicas and aluminum compounds.
- 6 ~
The next component is a plasticizer exemplified by dioctyl phthalate. This plasticizer affords to the dried or set liquid electrical tape formulation, the property of being flexible. Thus, the finished or set "tape" will not crack or separate under the force of vibration. The plasticizer may vary in the preferred liquid electrical tape formulation from about 5% to 15% by weight. If too much plasticizer is used, the formulation will "weep" as the plasticizer migrates to the surface. Examples of other plasticizers that will function satisfactorily in the present formulation are castor oil, other phthalates and soy bean based plasticizers.
It is important that the ratio of vinyl component to dioctyl phthalate or other plasticizer be in the vicinity of 2.5:1 Increases beyond this ratio will result in a relatively rigid final coating that will fracture and separate from the substrate on which the liquid electrical tape formulation is coated. Should the ratio drop to 2:1 or less, then the formulation may not harden well.
Then, there is the stabilizer exemplified by the epoxy stabilizer. The preferred epoxy stabilizer is known as ERL
42-21 and is made by Union Carbide Co. It is preferred that this stabilizer be present in an amount of about 5% in the overall formulation. Another epoxy stabilizer, used in an amount of about 3% in the overall formulation is made by Shell Corporation and is known as Shell Epon 828 (Epon is a trade mark). It has been determined that the formulation of the present invention without the stabilizer will in storage at elevated temperatures, tend to release acid which will interact with the inside surface of a metal container.
These in turn will initiate unwanted polymerization of the vinyl copolymer. The epoxy stabilizer is comprised of one or more functional liquid epoxy resins and may vary in the . ~ ~ . .. . .. . . . .. . ..
preferred liquid electrical tape formulation from about 1/2%
to 6% by weight. Non-epoxy stabilizers, compatible with other ingredients in the present formulation may be used to prevent premature polymerization of the formulation.
Finally, there are the solvents. Toluene is present because it is a very effective drying agent. However, it is a significantly flammable product whose flammability is controlled with the presence of the methylene chloride component. There is also a significant amount of methyl ethyl ketone in the preferred formulation as it is an effective solvent for both the vinyl component and the thixotropic agent to keep these two components in solution.
Also, methyl ethyl ketone affords additional quick drying properties to the overall formulation although it is quite flammable.
The preferred range of methyl ethyl ketone is from about 20% to 40% by weight. When the levels of methyl ethyl ketone are reduced to a level of approximately 20% it would be near impossible to keep the vinyl and rubber based resin in solution and you would get a seeding out or thickening of a percentage of the mass. When the level of the methyl ethyl ketone is increased over 40%, a dramatic increase in the dry rate will be noted and stability in small quantities will be reduced significantly.
The preferred range of toluene is from about 10% to 15%
by weight. If the amount of toluene exceeds 20%, the overall formulation will "skin" immediately and/or flash too quickly. It may even dry on the brush. Where toluene falls to less than about 10%, the vinyl component could precipitate out of solution.
B
The final solvent is methylene chloride which has good flammability resistance (raises flashpoint to exceed 20~F).
Methylene chloride adds good film forming or coating properties. It is preferably present in a weight percentage range of from 10 to 20%.
PREPARATION METHOD
The liquid electrical tape formulation of the present invention is prepared by first introducing methyl ethyl ketone and toluene in a closed vessel. Then, the thixotropic agent such as AC 4 Pliolite and the vinyl copolymer are slowly fed into the closed vessel under continuous agitation that is sufficient enough to insure proper dispersion. Mixing should continue for at least 30 minutes and then there should be a check for completeness of dispersion. This can be done by obtaining a sample from the closed vessel and pouring some of it on a glass plate such that particles that are not dissolved in the formulation are easily observable.
Then, the methyl chloride is added, followed by another 15 minutes of mixing action. This is followed by the slow addition of the dioctyl phthalate so as not to shock the solution.
After the dioctyl phthalate has been added, the viscosity should be checked. Here, a satisfactory of viscosity is between 2,000 and 2,500 centipoise on a Brookfield viscometer at 78~F, 20 RPM and a #4 spindle.
This reading should be taken after five revolutions. Any adjustments to viscosity should be made usin~ a combination of methyl ethyl ketone and toluene in a proper ratio of about 3:1 as set forth in the preferred formula. Such adjustment of viscosity continues until the target of 2,000 to 2,500 centipoise is achieved.
Methylene chloride adds good film forming or coating properties. It is preferably present in a weight percentage range of from 10 to 20%.
PREPARATION METHOD
The liquid electrical tape formulation of the present invention is prepared by first introducing methyl ethyl ketone and toluene in a closed vessel. Then, the thixotropic agent such as AC 4 Pliolite and the vinyl copolymer are slowly fed into the closed vessel under continuous agitation that is sufficient enough to insure proper dispersion. Mixing should continue for at least 30 minutes and then there should be a check for completeness of dispersion. This can be done by obtaining a sample from the closed vessel and pouring some of it on a glass plate such that particles that are not dissolved in the formulation are easily observable.
Then, the methyl chloride is added, followed by another 15 minutes of mixing action. This is followed by the slow addition of the dioctyl phthalate so as not to shock the solution.
After the dioctyl phthalate has been added, the viscosity should be checked. Here, a satisfactory of viscosity is between 2,000 and 2,500 centipoise on a Brookfield viscometer at 78~F, 20 RPM and a #4 spindle.
This reading should be taken after five revolutions. Any adjustments to viscosity should be made usin~ a combination of methyl ethyl ketone and toluene in a proper ratio of about 3:1 as set forth in the preferred formula. Such adjustment of viscosity continues until the target of 2,000 to 2,500 centipoise is achieved.
In testing the present formulation has consistently formed excellent coatings even after having been maintained in 4 fluid ounce (240 ml) metal containers for at least 3 months at a temperature in the range of 60~F to 80~F. When applied as a coating the formulation did not run or drip even when coated on a wire, cable or object maintained at 250~F. After exposure at 0~F for 72 hours the coating maintained its flexibility and adhesion to the substrate.
N~l~lNG
The basic formulation produced is colorless. Should it be desired that the formula have color, it is necessary to prepare a coloring material that will be used in a ratio of about 3 parts by weight to 97 parts of the basic liquid electrical tape formulation.
The coloring material has the following formulation by weight:
23.4% VYHH
1.50% AC 4 36.70% Methyl Ethyl Ketone 13% Toluene 12% Methylene Chloride 9.30% Dioctyl Phthalate 3.1% Talc The talc in the foregoing formulation is a dispersant.
The mixture for the colorant to tint the base is as follows:
White, Red and Green should encompass:
66.30% Dioctyl Phthalate .70% Neosperse / 657 Cosperse (dispersant) (Neosperse and Cosperse are trade marks) 33% Titanium Dioxide (for white color only), or 33%
- 1o -Phthalo Green (for green color only) or 33% Red 2B
(for red color only) The f~regoing should be prepared in a high speed disperser and should be checked to insure proper dispersion.
Black tinting base is as follows:
58.70% Dioctyl Phthalate 1.97% Neosperse / 657 Cosperse (codispersant) 39.40% Carbon Black The evaluation of the viscosity is as set forth in the preparation method for the basic formulation as previously described.
From the foregoing, it can be seen that there is provided, a liquid electrical tape formulation which has excellent shelf life and yet when applied to a desired surface, will form a vinyl resin film that is sufficiently flexible to be durable under the stress of vibration and will not readily crack for any other reason.
Without further elaboration, the foregoing will so fully illustrate our invention that others may, by applying future knowledge, adopt the same for use under various conditions of service.
N~l~lNG
The basic formulation produced is colorless. Should it be desired that the formula have color, it is necessary to prepare a coloring material that will be used in a ratio of about 3 parts by weight to 97 parts of the basic liquid electrical tape formulation.
The coloring material has the following formulation by weight:
23.4% VYHH
1.50% AC 4 36.70% Methyl Ethyl Ketone 13% Toluene 12% Methylene Chloride 9.30% Dioctyl Phthalate 3.1% Talc The talc in the foregoing formulation is a dispersant.
The mixture for the colorant to tint the base is as follows:
White, Red and Green should encompass:
66.30% Dioctyl Phthalate .70% Neosperse / 657 Cosperse (dispersant) (Neosperse and Cosperse are trade marks) 33% Titanium Dioxide (for white color only), or 33%
- 1o -Phthalo Green (for green color only) or 33% Red 2B
(for red color only) The f~regoing should be prepared in a high speed disperser and should be checked to insure proper dispersion.
Black tinting base is as follows:
58.70% Dioctyl Phthalate 1.97% Neosperse / 657 Cosperse (codispersant) 39.40% Carbon Black The evaluation of the viscosity is as set forth in the preparation method for the basic formulation as previously described.
From the foregoing, it can be seen that there is provided, a liquid electrical tape formulation which has excellent shelf life and yet when applied to a desired surface, will form a vinyl resin film that is sufficiently flexible to be durable under the stress of vibration and will not readily crack for any other reason.
Without further elaboration, the foregoing will so fully illustrate our invention that others may, by applying future knowledge, adopt the same for use under various conditions of service.
Claims (8)
1. A thermoplastic liquid electrical tape formulation having good shelf life, said formulation in itself forming a durable vinyl coating or film on wires, junctions and objects, said formulation consisting essentially in weight percentages of from 10% to 60% of an electrically insulating vinyl material effective to achieve said durable vinyl coating, said vinyl material consisting essentially of a vinyl chloride copolymer including a major amount of vinyl chloride units (-CH2-CHCl-) and a minor amount of vinyl acetate units (-CH2-CHCOOCH3-), said formulation further including from 1 to 2% of a modified vinyl toluene acrylate copolymer as a thixotropic agent to add body, and 5 to 15%
of a plasticizer to impart flexibility to the vinyl coating, said vinyl material, thixotropic agent and plasticizer being admixed with toluene which functions as a solvent and a drying agent, said formulation further including a stabilizing agent present in an amount of about 3 to 5% to prevent acid release, and at least one solvent present in an amount from 20 to 40% by weight to enable the application of a satisfactory coating, with said formulation, prior to use and when held in a container, being capable of remaining unchanged for a substantial period of time and said formulation also being quick drying at ambient temperatures.
of a plasticizer to impart flexibility to the vinyl coating, said vinyl material, thixotropic agent and plasticizer being admixed with toluene which functions as a solvent and a drying agent, said formulation further including a stabilizing agent present in an amount of about 3 to 5% to prevent acid release, and at least one solvent present in an amount from 20 to 40% by weight to enable the application of a satisfactory coating, with said formulation, prior to use and when held in a container, being capable of remaining unchanged for a substantial period of time and said formulation also being quick drying at ambient temperatures.
2. The formulation of Claim 1 wherein said vinyl material is present in an amount of about 25%.
3. The formulation of Claim 1 wherein said stabilizing agent is an epoxy based stabilizer present in an amount effective to prevent premature polymerization of the formulation.
4. The formulation of Claim 1 wherein the plasticizer is dioctyl phthalate.
5. The formulation of Claim 4 wherein the ratio by weight of vinyl material to dioctyl phthalate is in the range of about 2.5 to 1.
6. The formulation of Claim 1 wherein toluene is present in an amount from 10 to 15% by weight of the total formulation.
7. The formulation of Claim 1 and further including methyl ethyl ketone, present in a weight percent of the overall formulation, from 20 to 40%.
8. The formulation of Claim 7 and further including methylene chloride present in a weight percent of the overall formulation, from 10 to 20%.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002066470A CA2066470C (en) | 1989-10-20 | 1992-04-24 | Liquid electrical tape formulation |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US42446689A | 1989-10-20 | 1989-10-20 | |
CA002066470A CA2066470C (en) | 1989-10-20 | 1992-04-24 | Liquid electrical tape formulation |
JP14731492A JP3399975B2 (en) | 1989-10-20 | 1992-06-08 | Liquid composition |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2066470A1 CA2066470A1 (en) | 1993-10-25 |
CA2066470C true CA2066470C (en) | 1999-06-22 |
Family
ID=27169069
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002066470A Expired - Lifetime CA2066470C (en) | 1989-10-20 | 1992-04-24 | Liquid electrical tape formulation |
Country Status (1)
Country | Link |
---|---|
CA (1) | CA2066470C (en) |
-
1992
- 1992-04-24 CA CA002066470A patent/CA2066470C/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
CA2066470A1 (en) | 1993-10-25 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3676391A (en) | Coating compositions for polyolefin substrates | |
US4279962A (en) | Protective coating for cathodically protected metal surfaces | |
CA1203037A (en) | Water-repellant anhydride copolymer coating for insulated electrical wiring | |
JP3260754B2 (en) | Aqueous coating composition | |
US5250598A (en) | Liquid electrical tape formulation | |
JP3109830B2 (en) | Riogel, its preparation and use in sealing | |
US4385134A (en) | Organotin polysiloxane and acrylic antifouling coating | |
CA2066470C (en) | Liquid electrical tape formulation | |
WO1991005822A1 (en) | Liquid electrical tape formulation | |
US4254006A (en) | Adhesion of vinyl plastisol coatings | |
US4227042A (en) | Telephone cords | |
US4581259A (en) | Composition and method for coating objects of acrylic resin and coated objects thus obtained | |
US3081140A (en) | Process for coloring polyvinyl materials | |
US20060135667A1 (en) | Liquid electrical tape with flame retardant | |
US2453214A (en) | Ethyl cellulose composition | |
WO1994001502A1 (en) | Antifouling paint composition | |
US4279789A (en) | Acrylic copolymeric coating composition | |
US2757155A (en) | Stabilized chlorosulfonated hydrocarbon polymer compositions | |
US4354000A (en) | Resilient plastic wall coating for the building industry | |
US3244656A (en) | Paints | |
US4966936A (en) | Plastisol composition | |
JPH09208342A (en) | Waterproof material for fair-faced concrete and polymer for cement admixture | |
RU2036214C1 (en) | Thermostable dye | |
US3655612A (en) | Preservative and impervious surface coating paste | |
SU1024488A1 (en) | Coating composition |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKEX | Expiry |