MXPA99009853A - A composition and method for reducing noise and/or fouling in a liquid cooling system - Google Patents
A composition and method for reducing noise and/or fouling in a liquid cooling systemInfo
- Publication number
- MXPA99009853A MXPA99009853A MXPA/A/1999/009853A MX9909853A MXPA99009853A MX PA99009853 A MXPA99009853 A MX PA99009853A MX 9909853 A MX9909853 A MX 9909853A MX PA99009853 A MXPA99009853 A MX PA99009853A
- Authority
- MX
- Mexico
- Prior art keywords
- further characterized
- composition
- liquid
- composition according
- carrier
- Prior art date
Links
- 239000007788 liquid Substances 0.000 title claims abstract description 43
- 239000000203 mixture Substances 0.000 title claims abstract description 40
- 238000001816 cooling Methods 0.000 title claims abstract description 14
- 210000001724 Microfibrils Anatomy 0.000 claims abstract description 37
- 239000000463 material Substances 0.000 claims abstract description 35
- 239000000969 carrier Substances 0.000 claims abstract description 15
- 239000000110 cooling liquid Substances 0.000 claims abstract description 4
- 239000007891 compressed tablet Substances 0.000 claims abstract description 3
- 239000003507 refrigerant Substances 0.000 claims description 24
- -1 polybenzoimidazoles Polymers 0.000 claims description 14
- 239000000725 suspension Substances 0.000 claims description 13
- 239000002826 coolant Substances 0.000 claims description 9
- 239000004094 surface-active agent Substances 0.000 claims description 7
- 239000004760 aramid Substances 0.000 claims description 6
- 229920003235 aromatic polyamide Polymers 0.000 claims description 5
- 125000003118 aryl group Chemical group 0.000 claims description 4
- 239000004973 liquid crystal related substance Substances 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 3
- 239000004677 Nylon Substances 0.000 claims description 2
- 239000004696 Poly ether ether ketone Substances 0.000 claims description 2
- 239000004698 Polyethylene (PE) Substances 0.000 claims description 2
- 239000004743 Polypropylene Substances 0.000 claims description 2
- 239000004793 Polystyrene Substances 0.000 claims description 2
- 229920001328 Polyvinylidene chloride Polymers 0.000 claims description 2
- WMGSQTMJHBYJMQ-UHFFFAOYSA-N aluminum;magnesium;silicate Chemical compound [Mg+2].[Al+3].[O-][Si]([O-])([O-])[O-] WMGSQTMJHBYJMQ-UHFFFAOYSA-N 0.000 claims description 2
- 229920001577 copolymer Polymers 0.000 claims description 2
- 229920001778 nylon Polymers 0.000 claims description 2
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims description 2
- 229920002530 poly[4-(4-benzoylphenoxy)phenol] polymer Polymers 0.000 claims description 2
- 239000004417 polycarbonate Substances 0.000 claims description 2
- 229920000515 polycarbonate Polymers 0.000 claims description 2
- 229920000728 polyester Polymers 0.000 claims description 2
- 229920000570 polyether Polymers 0.000 claims description 2
- 229920000573 polyethylene Polymers 0.000 claims description 2
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 2
- 239000004926 polymethyl methacrylate Substances 0.000 claims description 2
- 229920001155 polypropylene Polymers 0.000 claims description 2
- 229920002223 polystyrene Polymers 0.000 claims description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 2
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 2
- 239000004800 polyvinyl chloride Substances 0.000 claims description 2
- 239000005033 polyvinylidene chloride Substances 0.000 claims description 2
- XCRBXWCUXJNEFX-UHFFFAOYSA-N Peroxybenzoic acid Chemical compound OOC(=O)C1=CC=CC=C1 XCRBXWCUXJNEFX-UHFFFAOYSA-N 0.000 claims 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims 1
- 125000003827 glycol group Chemical group 0.000 claims 1
- 238000007792 addition Methods 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 4
- 230000004059 degradation Effects 0.000 description 4
- 238000006731 degradation reaction Methods 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- LYCAIKOWRPUZTN-UHFFFAOYSA-N glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- DNIAPMSPPWPWGF-UHFFFAOYSA-N propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000002522 swelling Effects 0.000 description 2
- 238000002166 wet spinning Methods 0.000 description 2
- LCJRHAPPMIUHLH-UHFFFAOYSA-N 1-$l^{1}-azanylhexan-1-one Chemical compound [CH]CCCCC([N])=O LCJRHAPPMIUHLH-UHFFFAOYSA-N 0.000 description 1
- QFMDFTQOJHFVNR-UHFFFAOYSA-N 1-[2,2-dichloro-1-(4-ethylphenyl)ethyl]-4-ethylbenzene Chemical compound C1=CC(CC)=CC=C1C(C(Cl)Cl)C1=CC=C(CC)C=C1 QFMDFTQOJHFVNR-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-N HF Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 1
- 229920000271 Kevlar® Polymers 0.000 description 1
- 229920001410 Microfiber Polymers 0.000 description 1
- 229920002292 Nylon 6 Polymers 0.000 description 1
- 239000011358 absorbing material Substances 0.000 description 1
- 230000003373 anti-fouling Effects 0.000 description 1
- 230000002308 calcification Effects 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000003247 decreasing Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 235000019589 hardness Nutrition 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000003658 microfiber Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920000137 polyphosphoric acid Polymers 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
Abstract
A composition for use in reducing noise and/or fouling in a liquid cooling system of an engine, e.g. an automotive engine, comprising an organo-polymeric microfibril material insoluble in the cooling liquid of the liquid cooling system, the microfibrils having an aspect ratio (length to diameter) in the range 10 to 5000. Preferably the microfibril material is contained in a carrier, which may be in the form of a liquid, a gel or a compressed tablet soluble or dipersible in the cooling liquid.
Description
COMPOSITION AND METHOD FOR REDUCING NOISE AND / OR INCRUSTATION IN A LIQUID REFRIGERANT SYSTEM
DESCRIPTIVE MEMORY
The present invention relates to a composition for use in reducing noise and / or embedding in a liquid cooling system of a motor, and a method of reducing noise and / or embedding in said liquid cooling system. It is known that noise is produced as a result of turbulence, cavitation and swirling when the liquid flows in pipes, ducts and hollows. The methods currently used to reduce the noise produced by the liquid in closed systems, specifically the cooling system of a hot engine, has been concentrated to date on macromechanical aspects, that is, by varying the pump specification, or surrounding the noise source in noise absorbing materials, or increasing the thickness of the liquid container. Other methods have been used to reduce the volume of the cooling system to a minimum or to polish the internal surfaces of the pipes refrigerante of the conduit, whose curvatures, constructions, expansions and hardnesses promote the turbulence, cavitation and swirling that produce vibrations and noise.
These methods have limited application, and do not solve the main causes of noise, ie the cavitation, turbulence and swelling produced when the liquid circulates. An object of the present invention is to provide a composition and a method of reducing the main causes of noise at a "micromechanical" level which results in reduced cavitation, turbulence and whirling and therefore noise. A first aspect of the invention provides a composition for use in the reduction of noise and / or fouling in a liquid refrigerant system of an engine comprising an organo-polymeric microfibril material insoluble in the liquid refrigerant of the liquid refrigerant system, the microfibrils having an aspect ratio (length to diameter) on the scale of 10 to 5,000. A second aspect of the invention provides a method of reducing noise and / or embedding in a liquid cooling system of a motor comprising the addition of the composition according to the first aspect of the invention to a liquid cooling system of a motor. Microfibril material reduces cavitation, turbulence, swelling and therefore noise when introduced into the liquid refrigerant system. In addition, said material reduces the incrustation, if any, of the internal surfaces of the refrigerant system. Preferably, the aspect ratio is in the range of 10 to 3000. Excessive aspect ratios will lead to the entanglement of the individual microfibrils, and therefore to the precipitation in the flow liquid. Preferably, the organopolymer microfibril material is an organic polymer in the form of microfibrils having an average diameter on the scale of 1nm-15μm, an average length on the scale of 100nm-3mm. The polymeric materials to be processed in the microfibrils must be insoluble but highly dispersible in a given coolant. Polyethylene, polypropylene, polystyrene, polyvinyl chloride, polyvinylidene chloride, polytetrafluoroethylene, polyethylene terephthalate, polymethylmethacrylate, nylon, polycarbonate, and copolymers or mixtures thereof can be used for example. Polymeric compounds known for their heat resist can be used, which include para-amides, aromatic polyamides, aromatic polyethers, polyetheretherketones, aromatic polyesters, aromatic polyamides and polybenzoimidazoles. The polymeric materials that have been found particularly preferable are those that are capable of forming a liquid crystal. Specific examples include aramid fibers such as wet spinning of poly-p-phenylene terephthalamide of the liquid crystal solutions of sulfuric acid, and wet spinning of polybenzobistiazole of the liquid crystal solution of polyphosphoric acid. "Microfibrils" refers to short fiber lengths. Microfibrils do not microfibrilate.
"Highly dispersible" refers to the state of the polymeric microfibers that can be observed to form a uniform suspension after mixing vigorously for a certain period. The selection of the polymer microfibril material will depend on the particular type of coolant in which the material is used; clearly, the material must not react chemically with the liquid refrigerant of the liquid refrigerant system, nor with the carrier liquid.
In addition, the polymeric microfibril material should not degrade easily, but should have a reasonable life in the coolant. What is referred to when microfibrils are
"insolubles" in a liquid can be determined by an experiment in which 1% by weight of polymeric microfibrils is added to the liquid, and stirred vigorously for five hours at a treatment temperature, followed by filtration, and drying, where The material is measured by weight reduction. If said reduction is less than 10% by weight of the original weight, then the microfibril material is considered insoluble. There is no restriction in the manufacture of the polymeric microfibril material. In order to improve the dispersibility of the microfibril material in the coolant, and to boost the stability of the resulting suspension, the material can be treated with a suitable surfactant, or chemically modified, or physically treated.
A suitable surfactant is the modified alcoholetoxylate or "Ethylan CPG660" or "Monolan 8000 / E80" from Ackros Chemicals Limited. The liquid refrigerant of the liquid refrigerant system can be aqueous or non-aqueous, for example hydrofluoric ether, water, oils, a liquid hydrocarbon or any other suitable liquid refrigerant. In order to reduce the risk of health damage by dust, said material is preferably contained in a carrier. The carrier can be, for example, a liquid, a gel or a compressed tablet soluble and dispersible in said cooling liquid. The carrier of preference is completely soluble in the coolant. When the carrier is a liquid or a gel, sedimentation of the polymeric microfibril material should be avoided during storage, and promotion of the appropriate dose during packing or in the application of production line requiring the division of the large quantities. Said carrier can be magnesium aluminum silicate in suspension, propylene glycol, cellulose solution or any other suitable compound. The method of the invention finds effective application where liquids are used in closed refrigerant systems, particularly where noise or fouling contamination are negative factors of the system, as are automotive cooling systems, and more generally where a hot engine with a liquid cooling system. The invention will now be described with reference to the following examples:
EXAMPLE 1
A suitable suspension was prepared by mixing water, glycol (approximately 33% by weight of glycol) and a surfactant (modified alcoholetoxylate) at 6 ppm with Nylon-6 polymeric microfibrils of 10 nm by 1 μm in size, i.e. a ratio of aspect from 100 to 50 ppm. The solution was subjected to 10000 cycles in an automotive refrigerant system. As compared to the use of a water-glycol mixture, the addition of the polymeric microfibril material produced a substantial reduction in noise. However, the noise reduction decreased proportionally with the increase cycle number during the test; some degradation of the suspension was observed. In addition, as compared to the water-glycol mixture, the addition of the polymeric microfibril material resulted in a medial reduction in the incrustation of the surface within the refrigerant system.
EXAMPLE 2
A stable suspension was prepared by mixing water-glycol and a surfactant at 6 ppm as in Example 1 with polymeric microfibrils of aramid, ie, poly-p-phenylene terephthalamide (ie, Du Pont's KEVLAR®) of 12 μm per 250 μm in size, eg, an aspect ratio of 20.9 to 100 ppm. The solution was subjected to 10000 cycles in a closed system. As compared to the use of a water-glycol mixture, the polymeric microfibril material produced a consistent reduction in noise during the test, and no degradation of the suspension was observed. The noise reduction observed was greater than that of Example 1. In addition, as compared to a water-glycol mixture, the addition of the polymeric microfibril material resulted in a medial reduction in the scale of the surface within the refrigerant system.
EXAMPLE 3
A stable suspension was prepared by the water-glycol mixture, and a surfactant at 6 ppm with poly-p-phenylene terephthalamide polymeric microfibrils of 5 μm per 250 μm in size, ie an aspect ratio of 50 μm. 400 ppm. The solution was subjected to 10000 cycles in a closed system.
As compared to the use of a water-glycol mixture, the polymeric microfibril material produced a consistent reduction in noise during the test, and no degradation of the suspension was observed. The noise reduction observed was greater than that of Example 2.
EXAMPLE 4
The stable suspension was prepared by mixing water, glycol and a surfactant at 6 ppm as in Example 1 with polymeric microfibrils of poly-p-phenylene terephthalamide 50 nm by 250 μm in size, ie a ratio of appearance from 5000 to 100ppm. The solution was subjected to 10,000 cycles in a closed system. As compared to the use of a water-glycol mixture, the polymeric microfibril material produced a consistent reduction in noise during the test, and no degradation of the suspension was observed. The noise reduction observed was even greater than that of the
Example 3. The observed noise reduction was typically found on the 8 to 15 dB scale at frequencies in the 3 to 10 KHz range. The observed anti-incrustation, which was difficult to quantify, was that of the internal surfaces of the refrigerant system that became generally cleaner and in most cases the removal of apparent calcifications.
In order to reduce noise and fouling, if any, in a liquid vehicle engine coolant system, the composition was added to the vehicle radiator expansion tank, or directly to the radiator. If the carrier is a liquid, the composition can be contained in a bottle. The bottle must be shaken before the content is added to the refrigerant system. The noise reduction was achieved once the composition was completely dispersed in the cooling system, and this happened quickly once the engine was running. The anti-fouling effect was observed in a period during which the engine was running. The composition could be removed by draining and cooling system fluid. It should be understood that the term microfibril is intended only for short fiber lengths. The microfibrils do not microfibrilate because this degrades the development of the composition as the microfibrils tend to become entangled in this way to accumulate or pile up and settle out instead of remaining in the suspension. It is also preferred that the microfibrils are formed of flexible material instead of brittle material, since in the latter case the breaking of the microfibrils over time the development of the composition degrades again. The features described in the foregoing description, the following claims or appended drawings, expressed in their specific forms or in terms of a means to perform the function described, or a method or method to achieve the result described, or a class or group of substances or compositions, as appropriate, could, separately, or in combination with said characteristics, be used to carry out the invention in various forms thereto.
Claims (16)
1. The composition for use in the reduction of noise and / or embedding in a liquid refrigerant system of an engine comprising a microfibrile organopolymer material insoluble in the liquid refrigerant of the liquid refrigerant system, the microfibrils having an aspect ratio (
2. A composition according to claim 1, further characterized in that the aspect ratio of the microfibrils is in the range of 10 to 3000.
3. A composition of according to claim 1 or 2, further characterized in that said material is contained in a carrier.
4. A composition according to claim 3, further characterized in that the carrier is a liquid, said material being insoluble and dispersible in the carrier liquid.
5. A composition according to claim 3, further characterized in that the carrier is a gel soluble in said coolant, said material being insoluble and dispersible in the gel.
6. A composition according to claim 3, further characterized in that the carrier is in the form of a compressed tablet soluble or dispersible in said cooling liquid.
7. - A composition according to claim 4, further characterized in that the liquid carrier is a glycol, magnesium aluminum silicate in suspension, alcohol, or hydroxybenzoate.
8. A composition according to any of the preceding claims, further characterized in that said material has an average diameter of 1 nm-5 μm, an average length of 100 nm-3 nm.
9. A composition according to any of the preceding claims, further characterized in that said material is selected from paramides, aromatic polyamides, aromatic polyethers, polyether ether ketones, aromatic polyesters, aromatic polyamides, polybenzoimidazoles, polyethylene, polypropylene, polystyrene, polyvinyl chloride, polyvinylidene chloride, polytetrafluoroethylene, polyethylene terephthalate, polymethylmethacrylate, nylon, polycarbonate, and copolymers or mixtures thereof.
10. A composition according to claim 9, further characterized in that said material is capable of forming a liquid crystal.
11. A composition according to claim 10, further characterized in that the compound is poly-p-phenylene terephthalamide or polybenzobistiazole.
12. A composition according to any of the preceding claims, further characterized in that the carrier includes a surfactant to facilitate the stability of said material in the liquid refrigerant of the liquid refrigerant system.
13. A composition substantially as described herein with reference to any of the given examples.
14. The method of reducing noise and / or embedding in a liquid refrigerant system by adding a composition to the liquid refrigerant according to any of the preceding claims.
15. A method according to claim 14, further characterized in that the amount of added composition is 0.1 ppm to 5% by weight of the coolant.
16. A method according to claim 14 or 15 further characterized in that the composition is added to the coolant of an automotive cooling system.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9708575.7 | 1997-04-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| MXPA99009853A true MXPA99009853A (en) | 2000-12-06 |
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