DE1026921B - Covering oil for air filter - Google Patents

Description

GERMAN

The invention relates to filters and filter oil mixtures for use in filtering air and other gases. The invention relates to primarily thixotropic, gel-like mixtures to which dust and other foreign substances adhere when they are with them come into contact. Such mixtures are applied to filter pads, which have the shape of Metal screens, fiber mats, glass wool or other fibrous materials used in air filters, can have.

The state of the art includes various types of oil-like mixtures, which include soaps, chlorinated compounds, Phosphorus compounds and the like as dust collectors and dust retardants when used in various Types of filters included. Mixtures of this kind are not satisfactory: first, because they have the tendency have to flow away from the filter pad, especially at higher temperatures, thereby reducing the dust-binding Effect of the mixture is diminished, secondly because they often have a pungent odor, thirdly in some Cases because of their flammability and fourthly because of large amounts of thickening or stickiness conditional agents are required, which make the mixtures more expensive.

It has now been found that excellent air filters can be produced by coating the metal sieves or fibrous material of air filters with thixotropic, gel-like mixtures which have a predominant proportion of a mineral lubricating oil which contains a synergistic additive in critical amounts which is im substantially resistant from 0.5 to 3% of a to water, aminated, which has been treated with a phosphorus acid oleophilic clay, and from 0.5 / ₀ thereof, an alkylene glycol or an ether to 2 ° and 0.5 to 5% consists of an oil-soluble, adhesive polymeric compound. The percentages relate to the weight and are calculated on the total mixture.

The water-resistant, oleophilic clay can be prepared by aminating suitable colloidal clays such as Bentonite, hectorite, as well as synthetic clays with amino compounds, so that the resulting aminogel acquires an oleophilic character, whereupon said oleophilic clay with an organic or inorganic, acidic, phosphorus-containing compound is treated. If desired, the sound can go first treated with a phosphorus acid and then with an amino compound. The end product can be an onium compound or a phosphate salt, or the amine can be physically acidified on the Clay can be adsorbed, or a mixture of these substances can be present. The amines which are used to aminate Clays that can be used include surface coating oil for air filters

Applicant:

NV De Bataafsche Petroleum
Maatschappij, The Hague

Representative: Dr. K. Schwarzhans, patent attorney,
Munich 19, Rornanplatz 9

Claimed priority:
V. St. v. America June 18, 1956

Jack William Armstrong, Concord, Calif.,
Harold Albert Woods and Charles Edwin Francis,

Martinez, Calif. (V. St. Α.),
have been named as inventors

active amino compounds, such as long-chain aliphatic « Amines having at least 10 and preferably 10 to 20 carbon atoms in the molecule, e.g. B. dodecyl and Octadecylamine, as well as salts of such amines with inorganic or organic acids and quaternary ammonium salts, z. B. tetradecylamine hydrochloride, octadecylamine hydrochloride, dioctyldecylamine hydrochloride, Octadecylamine hydrobromide, octadecylamine acetate, dioctyldecylamine acetate, 12-oxystearylamine lactate, trimethyldodecylammonium chloride, Triethylhexadecylammonium chloride and dimethyldiheptadecylammonium chloride. Others that can be used within the scope of the invention Amino compounds are acrolein-ammonia condensation products or epichlorohydrin-ammonia condensation products, in which the amino groups completely or partially by reaction with organic Carboxylic acids are converted into amido groups. Include the acids used to acidify the clay inorganic and organic acids of phosphorus, such as phosphorous acid, hypophosphoric acid, hypophosphorous Acid, orthophosphoric acid, pyrophosphoric acid, triphosphoric acid, tetraphosphoric acid, metaphosphoric acid, Dilauryl hydrogen phosphate, distearyl hydrogen phosphate, dicetyl hydrogen phosphate, lauryl cetyl hydrogen phosphate, Stearyl dihydrogen phosphate, lauryl dihydrogen phosphate, dimethyl hydrogen phosphate, dibutyl hydrogen phosphate, Tetradecane-1-phosphinic acid, 10-phenyldecyn-1-phosphoric acid.

The water-resistant, aminated, oleophilic clay that has been treated with a phosphoric acid,

709 957/375

3 4

is preferably in the mixture in an amount of Below are examples of the composition-1 up to 2% and particularly expediently given in an amount of mixtures according to the invention, from 1.3 to 1.5%.

The following examples explain working methods for mixture A.

Manufacture of water-resistant clay. 5 hectorite clay according to example 4 1.3%

Example 1 hexylene glycol 1.0%

^p polybutene (molecular weight 20,000) 2.0%

Hectorite clay was 95.7% in water to form a mineral oil (400 SUS at 100 ° F / 38.8 ° C) 2% hydrosol dispersed. After a settling period of 12 hours, the milky sol became abio mixture B

poured and the gait cut off. The hectorite hectorite clay according to Example 3 1.3%

was acidified with phosphoric acid and then for the purpose of hexylene glycol 1.0%

Conversion of the total amount of acidified clay polybutene (molecular weight 20,000) 2 ', 0%

in the phosphorus salt with dimethyldiheptadecylammo- mineral oil (400 SUS at 100 ° F / 37.8 ° C) 95.7%

treated with sodium chloride. The salt form of the aminogel 15

settled quickly and could easily be mixed with water. Mixture C

will wash, whereupon the gel for the purpose of eliminating hectorite clay according to Example 4 l, 4%

most of the water was filtered. Hexylene glycol 1.0%

Polybutene (molecular weight 20,000) 2.0%

Example 2 ^ao mineral oil (400 SUS at 100 ° F / 37.8 ° C) 95.6%

The procedure of Example 1 was repeated, mixture D

but with epichlorohydrin hectorite clay as aminating agent according to Example 2 1.4%

Ammonia condensation product instead of di-hexylene glycol 1.0%

methyldiheptadecylammonium chloride was used. 25 polybutene (molecular weight 20,000) 2.0%

Mineral oil (400 SUS at 100 ° F / 37.8 ° C) 95.6%

Example 3

The effectiveness of the mixture according to the invention as

The procedure was as in Example 1, but the coating for air filters is from the aminating elements below Mean a condensation product of 5 moles of 30 lead data can be seen. In Experiment I, Farr's ammonia and 1 mole of epichlorohydrin was used, air filter (4x4x2 inch) with the gein to be tested which one-third of the amino groups are coated by shuffling and put in a wind tunnel with tallow fatty acids in amido groups, the effect of dust in high concentration (20 g) was. set. A standard for the investigation of spark plugs

A large amount of 4 ³⁵ aardized fine dust was left with for about 10 minutes

■ a set air flow of 520 FPM through the

The procedure was as in Example 3, with filters being used. The mixtures A, B, C and D, however, instead of the tallow fatty acids, showed a mixture with a filter effectiveness of more than 60%. If the hectorite clay saturated C ₁₄ to C ₁₈ fatty acids was used. in mixtures A, B, C or D replaced by a soap

The 40 for use in the invention was, for. B. an alkali soap (Mixture Y), was the Mix suitable alkylene glycols are added to filter efficiency about 35 to 40%. the gelatinization due to the possible presence of the adhesion test (experiment II) were tarred

Prevent water. These connections include ^x / ₁₆ inch (1.6 mm) diameter weld wires in ethylene glycol, propylene glycol, hexylene glycol, and Ge. The test mixtures are dipped, removed, and mixed. Other substances that are used in place of the alkylene-45 are then hung vertically in a glycol oven for 24 hours at 180 ° F (82 ° C) or in conjunction with such and then weighed again. The weight can be the ethers of alkylene glycol or dialkylenes on the glycol treated with the mixtures A, B, C and D, z. B. ether of ethylene glycol and ether of wires retained residue was about diethylene glycol. In the group of such compounds were 0.035 g, while on wires that were coated with an oil, ethylene glycol monoethyl ether, ethylene glycol mono-50 (400 SUS at 100 ° F / 37.8 ° C), 3.4% butyl ether, ethylene glycol monoethyl butyl ether, ethylene - Contained polyethylene (mixture Z), only 0.008 g of back glycol monophenyl ether, diethylene glycol monomethyl were kept.

ether, diethylene glycol monoethyl ether, diethylene glycol- When tested in practice on air filters, which at

monobutyl ether, diethylene glycol monophenyl ether and the like As examples of the polymers, hydrocarbon mixtures A, B, C and D can be used for several months Material polymers are called, like polymers of oils - excellent results. These mixtures were themselves finen with 2 to 12 carbon atoms, including ali- at normal temperature, slightly on the filter upward and arylaliphatic olefins and inclusions. It also showed at elevated temperatures borrowed from homo- and copolymers, such as polyethylene, poly- no tendency to drip off during use butene, and copolymers of styrene with alkenes 60 the filters. They did not have an unpleasant odor and natural rubber. The molecular weight of the polymers on and had regarding the retention of dust is generally between 10,000 and 500,000. The effectiveness of over 60%. Commercial air volume of the polymer in the mixture contains preferred filter oils, which olefin polymers and / or soaps wisely between 1 and 3 percent by weight. showed when used in air filters of

The base oil can beasphaltic with very poor effectiveness from paraffinic, naphthenic, 65 diesel locomotives or mixed base raw oils minus the retention of dust, they were themselves which are appropriately refined, difficult to apply and at higher temperatures and can be in terms of viscosity or in terms of dripping during use. Boiling point in the viscosity or boiling range of gas oil From the above it can be seen that mixtures according to

up to heavy lubricating oil. 70 of the invention shows a viscosity-temperature behavior

show which allows easy application to the filter screens at low temperatures and after application on the sieves the retention of a strong stickiness at higher temperatures ensured and prevents dripping, especially at high temperatures.

Claims (12)

Patent claims: 1. Coating oil for air filters, consisting of a predominant proportion of a mineral lubricating oil, 0.5 to 3% of a water-resistant aminated oleophilic treated with a phosphorus acid Clays, 0.5 to 2% of an alkylene glycol or an ether of such and 0.5 to 5% of an oil-soluble, adhesive polymeric compound. 2. Mixture according to claim 1, characterized in that the water-resistant, aminated, with a phosphorus acid treated clay is present in an amount of 1 to 2%. 3. Mixture according to claim 1 or 2, characterized in that the treated clay in an amount is from 1.3 to 1.5%. 4. Mixture according to one of claims 1 to 3, characterized in that the clay is hectorite. 5. Mixture according to one of claims 1 to 4, characterized in that the clay with a Ευί-chlorohydrin-ammonia condensation product or a complete or partial amide thereof has been aminated. 6. Mixture according to one of claims 1 to 5, characterized in that the phosphorus-containing Acid is phosphoric acid. 7. Mixture according to one of claims 1 to 6, characterized in that the alkylene glycol Is hexylene glycol. 8. Mixture according to one of claims 1 to 7, characterized in that the oil-soluble, adhesive acting polymeric compound is present in an amount of 1 to 3%. 9. Mixture according to one of claims 1 to 8, characterized in that the oil-soluble, adhesive acting polymeric compound has a molecular weight between 10,000 and 500,000. 10. Mixture according to one of claims 1 to 9, characterized in that the oil-soluble, adhesive acting polymeric compound is a hydrocarbon polymer. 11. Mixture according to claim 10, characterized in that the hydrocarbon polymer is polybutene is. 12. Mixture according to claim 11, characterized in that that the polybutene has a molecular weight of about 20,000. 1 709 957/375 3.58