PRODUCTION METHOD

Technological Area:

This invention is about the hexagonal boron nitride containing polymer grease production method that’s used in lubrication needed areas such as deep drawing, rolling etc. in industries like automotive, aviation and defense.

Current Situation of the Technique:

Lubricators named grease consist of mineral, organic or synthetic oils drenched in metallic soaps or another thickener. Greases are used in various industries to lubricate moving parts, provide isolation and heat transfer or as mould or punch lubricators.

In the current situation of the technique using polymers as thickener dates back to early 1950s. In current systems polymer used in grease production is added during homogenization after grease is manufactured. Adding these kind of additives during homogenization causes the additive to lose its’ caharacteristic under high temperatures required by grease manufacturing. And this constitutes a significant disadvantage.

In the patent application issue numbered US3290244 A, “Atactic polypropylene containing grease compound” is described. The invention is about developing the adsorption quality of the grease by adding homopolymer polypropylene polymeres to soapy greases.

In the patenet application issue numbered US3671012 A,“Polymer containing grease compound” is described. In the method subject to invention it’s determined that adding polymer to metallic soapy greases reduces oxidation and confirmed a new method for production. In this method alkali soil metal carbonate is mixed with polymer and dispersant and added to lubricant in two stages.

In the patenet application issue numbered EP0700986 A2,“Polymer thickener lubricant grease” is described. In the method subject to invention it’s explained that grease manufacturing can be made by using polypropylenes in various molecular weights and with rapid cooling and then homogenization grinding.

In the patent application issue numbered US5773394 A,“Conductive polymer thickener grease compounds” are described. The invention is about an electricity conducting polymer grease development. Polypropylene and polyethylene are used together as polymer in the invention.

In the patent application issue numbered W02012076025 Al, “Polymer thickener grease compound and their use” is described. The invention is about a grease manufacturing method that makes their use in closed bearing houses easier by adding metallic soap in polymer grease.

In the patent application issue numbered US2013331307 Al,“Polymer thickener grease compounds with improved low friction characteristics” are described. The invention is about adding polar wax coupled with maleic anhydrite into grease to treat the friction coefficient of the polymer grease.

In the patent application issue numbered US2015368583 Al, “Polymer thickened grease compound and the method to make the same” is described. The invention is explaining the polymer grease production by rapid cooling and mechanical mixing at 90°C.

In the patent application issue numbered US3801505 A,“The Grease compound” is described. It’s about a grease compound produced by adding boron nitride %2-6 in weight and tungsten disulphide %4-12 in weight in a grease produced from perfloroalkylpolyether base oil thickened with polyetraflorethylene. In the patent application issue numbered US5512188 A,“Boron nitride powder and dithiophosphate containing grease compound for constant velocity joint” is described. The invention is about the constant velocity joint lubricant grease production by adding 0,4-2 pm sized stiffener boron nitride %0,5-10 in weight into base oil.

In the patent application issue numbered US6174841 Bl,“Heat reducing silicone grease compund and its’ use in semi-conductive device” is described. The invention is clarifying a heat reducing silicone grease compound having a weight of %0-30 of at least one powder selected from the group consisted of zinc oxide, alumina, boron nitride and silicone carbide powders, having 50-500, 000 cs viscosity at 25 °C, with a weight of %5-50 of liquid silicone, containing no bigger particles than 100 pm and consisted of a mixture with a weight of %50-95 of aluminium nitride powder having an average particle size of 0.5-10 pm.

In the patent application issue numbered CN102134469 A,“h-BN (Hexagonal Boron Nitride) containing Insulated Thermal Grease” is described. The product subject to invention is about a hexagonal boron nitride containing heat grease for insulation and cooling in electronic applications.

In the patent applications mentioned above, the polymer is added during the grease manufacturing and this leads to agglomeration. This causes a necessity for homogenization process. Adding the additives during manufacturing results in polymer characteristics to deteriorate and production process to be affected at high temperatures required for grease manufacturing.

In the patent application issue numbered US3196109 A,“Boron nitride containing lubricant grease” is described. The invention is about a grease manufacturing method that can be made by adding boron nitride particles with 10-200 mp (1 mp = 1 nanometer nm) particle sizes as the single stiffener with %4-10 in weight into polyphenylene ether. In the patent application mentioned above it’s stated out that boron nitride can be added in any stage of grease manufacturing along with other stiffeners in high ratios such as %4-10 and than treated through homogenization process. Adding boron nitride in such high ratios without treating through a pre-process will create agglomeration and deteriorate the nature and the characteristics of the grease.

In the patent application issue numbered US2901432 A,“Propylene and piperylene copolymers as grease thickeners” are described. In the product subject to invention the use of ploypropylene together with piperylene in grease manufacturing is explained.

In the patent application mnetioned above using only polymer creates a fiber formation and makes the product problematic to be used as grease.

As a result there’s a need for a new technology that doesn’t deteriorate the additive, increases the heat transfer coefficient, with shorter inner bonds, reduces agglomeration, improves grease quality, rapidly cools, can be used without loosing its’ characteristics at high temperatures and overcomes the disadvantages mentioned above.

The Invention Definition:

This invention is a Hexagonal boron nitride containing polymer grease production method and its’ charcteristic is being a new technology that doesn’t deteriorate the additive, increases the heat transfer coefficient, with shorter inner bonds, reduces agglomeration, improves grease quality, rapidly cools, can be used without loosing its’ characteristics at high temperatures.

In order to follow through all the purposes mentioned above and will be concluded from the detailed description below, the invention can be used by changing the polymer, boron nitride and additive ratios in grease used in lubrication needed areas such as deep drawing and rolling in industries like automotive, aviation, defense etc. With the method subject to invention, by adding the grease additive hexagonal boron nitride with superior solid lubricating, high heat transfer, electricity insulation and corrosion resistance qualities, into the grease, the grease qualities are significantly improved.

With the method subject to invention the homogenization process in grease manufacturing is eliminated and by treating the nano hexagonal boron nitride through a pre-process agglomeration is prevented and grease qualities are improved. The invention eliminates the homogenization process of greases manufactured using polymer (polypropylene, polyethylene, rubber etc.) stiffener by adding hexagonal boron nitride with varying particle sizes of 10-500 nm into the base oil (metallic oils, polyalpha olefin, poly alkali glycol, esters, polydimethyl silicon etc.) used to manufacture grease and involves the oil and polymer stiffener mixture cooling facilitation method. By using hexagonal boron nitride polymer stiffener rate is reduced. Various other additives can be added into the produced grease containing hexagonal boron nitride. These additives can be oxidation inhibitors (metal dialkalidiphosphates, benzotriazoles, metal dialkaliditiocarbamates, phenyl alpha naphtalimines etc.), compressive strengtheners (zinc dialkali ditio phosphate (ZDDP), zinc ditiophosphate (SDP), tricresyl phosphate (TCP), glycerol mono oleat, steric acid etc.), solid lubricants (graphite, molibden disulphate etc.).

In the method subject to invention, nano sized hexagonal boron nitride (hBN) is added to the grease during manufacturing. Because hexagonal boron nitride is a solid lubricant that can be used at high temperatures without loosing its’ characteristics, it can tolerate manufacturing temperatures without deteriorating in oil, polymer mixture. And this significantly improves grease quality.

The most important contribution of hexagonal boron nitride to grease manufacturing used in the method subject to invention is increasing the cooling speed due to increased heat transfer coefficient. This way grease forming speeds up. Nano hexagonal boron nitride particles in the formation prevents the grid structure to stretch and reduces the homogenization time. As specified in the literature hexagonal boron nitride is an additive that’s already being used in greases but in the method subject to invention grease manufacturing becomes easier and productivity increases by adding the polymer to grease at initial phase.

All the advantages of the method subject to invention will be understood clearer with the diagram given below and the detailed description written by referring this diagram so for this reason the assessment should be made considering this diagram and the detailed description.

Description of Figures:

The invention will be described by referring the figures enclosed, this way the characteristics of the invention will be understood and assessed clearer, but this is not intended to limit the invention with this specific arrangements. Vice versa it’s intended to cover all alternatives, changes and equivalents which can be involved under the area the invention is defined in by the claims enclosed. It must be understood that the shown details are given only for the description of the preferred arrangements of the current invention and presented to provide the most utili sable and clear definition of both the formation of the methods and the rules and conceptual characteristics of the invention. In these figures;

Figure 1 Schematic view of the method subject to invention.

The figures that will help out to understand this invention are numbered as specified in the enclosed figure and they’re given below by their names.

Description of References:

10. Adding Hexagonal Boron Nitride

20. Dispersing

30. Heating Process 40. Formation of Short Threaded Lattice Structure

50. Process

60. Mixture Becoming Homogeneous

70. Acquiring Polymer Grease

Description of Invention:

The invention involves the process steps of adding 10-500 nanometer sized hexagonal boron nitride %0,l-2 in weight into the mixture of %6-%12 polypropylene in base oil (10), ultrasonically dispersing the nano hexagonal boron nitride in the base oil in order to reduce agglomerate (20), treating the mixture with dispersed boron nitride through heating process (30) due to the used polymer and base oil, formation of short threaded lattice structure (40) by heating process (30), fast treating the grease through cooling process (50) to protect the lattice structure, with the formed mixture becoming homogeneous (60) acquiring the hexagonal boron nitride containing polymer grease (70).

The invention is characterized as having the process step of ultrasonically dispersing the nano-structured hexagonal boron nitride (20) in order to eliminate the homogenization process, prevent agglomeration and improve grease quality.

The invention involves the process step of adding hexagonal boron nitride (10) that enables to decrease polymer stiffener ratio.

The invention involves the process step of adding hexagonal boron nitride (10) that raises heat transfer coefficient and cooling speed and speeds up the grease formation.

The invention involves the process step of acquiring the polymer grease (70) usable in lubrication needed areas like automotive, aviation and defense industry by adding additives with varying ratios according to the industry and hexagonal boron nitride (10). The invention involves the process step of adding hexagonal boron nitride (10) which’ s a solid lubricant that can be used without loosing its’ characteristics at high temperatures.

The invention involves the process step of adding hexagonal boron nitride (10) into the polymer and oil mixture during the manufacturing of grease.

In the alternative arrangement of the invention, after acquiring hexagonal boron nitride containing polymer grease (70), additives can be added such as metal dialkalidiphosphates, benzotriazole, metal dialkaliditiocarbamades, phenyl alpha naphthalimine to prevent oxidation; zinc dialkali ditio phosphate (ZDDP), zinc ditiophosphate (ZDP), tricresol phosphate (TCP), glycerol mono oleat, steric acid to ensure compressive strength; and graphite, molibden disulphide as solid lubricants.

Detailed Description of Invention:

The process steps of the method subject to invention are; adding hexagonal boron nitride (10), dispersing it (20), heating process (30), formation of short threaded lattice structure (40), cooling process (50), mixture becoming homogeneous (60) and acquiring the polymer grease (70).

Acquiring the polymer grease (70) subject to invention is as follows: Bulu§ konusu polimer gresin elde edilmesi (70) §u §ekilde olmaktadir: First 10-500 nanometer sized hexagonal boron nitride %0,l-2 in weight is added into the mixture of %6-%12 polypropylene in base oil. This mixture is dispersed with ultrasonic dispersion of nano hexagonal boron nitride in the base oil in order to reduce agglomerate. The mixture with dispersed boron nitride is treated through heating process (30) due to the used polymer and base oil. With the heating process (30 grease is formed with the formation of short threaded lattice structure (40). By fast treating the grease through cooling process (50) to protect this lattice structure the formed mixture becomes homogeneous. As a result of these process steps hexagonal boron nitride containing polymer grease is acquired. In the method subject to invention it’s ensured to add nano sized hexagonal boron nitride (10) in to the grease during the manufacturing of polymer grease. Hexagonal boron nitride raises the heat transfer coefficient of the grease and increases its’ cooling speed. This way grease formation speeds up. Nano hexagonal boron nitride particles in the structure prevent the formed lattice structure and reduces the homogenization time. As specified in the literature hexagonal boron nitride is an already used additive in greases but with adding it to polymer grease at initial phase grease manufacturing becomes easier and productivity increases.