DE102005010409A1 - Anhydrous, instant mixable release and lubricant blends - Google Patents

Abstract

The invention relates to anhydrous, immediately mixable with an aqueous solvent release and lubricant mixtures for the treatment of the walls of a mold for primary forming or forming and the preparation of such release and lubricant mixtures.

Description

The The invention relates to anhydrous, instantaneously with an aqueous solvent mixable release and lubricant mixtures for the treatment of Walls of one Mold for forming or forming and the production of such Separating and lubricating mixtures.

conventional Separating agents or lubricants used in the metalworking industry For example, in die-casting, croning, drop forging etc., consist of oils and waxes in aqueous Dispersion (suspensions or in particular emulsions). For the production Such dispersions and emulsions in stable form are significant Quantities of emulsifiers needed, to avoid phase separation between water and oil and / or wax. This watery Dispersions usually have a solids content between 5 and 40 wt .-% on. The proportion of Emulsifiers at the solids content is between 10 and 30 wt .-%. Apart from minor Levels of additives (e.g., rust inhibitors, preservatives, Antifoam) is the remainder of the solid composition from oils and waxing.

The aqueous Release agents or lubricants are generally concentrates and must by the user as possible shortly before use with specially designed mixing or Dilution plants with Water to be diluted to a ready to use formulation (in general is the solids content about 0.2 to 0.4%).

This Facts and the fact that the state of the art known separation and lubricant mixtures water as essential Include component, bring significant disadvantages.

To the you have to high transport costs are to be accepted because due to the separation or lubricant composition a substantial proportion of water is transported. On the other hand, emulsions are released after some time unstable, which can cause shelf life problems.

Of Furthermore, the compositions are sensitive to attack through microorganisms and must Therefore, be added to biocides to ensure adequate shelf life to ensure. Of the possible Affected by microorganisms are in the same way the mixing or dilution systems and the apparatus for applying the release agents to the mold also affected by the addition of significant quantities Preservatives are taken.

These added preservatives can have negative influences the stability and thus exert the separation effect of the emulsion, further may Dangers due to possible health damage the preservative for the employees in metal forming, because they are generally during the spraying process are exposed to the nebulization of the release agent or lubricant.

Farther the user is forced to invest heavily in purchase, maintenance and maintenance of expensive mixing and dilution plants, which about that Experience has shown that error prone.

Of the Present invention therefore an object of the invention, separation and To provide lubricants that have the disadvantages of the known separation and avoid lubricant and also have a favorable shelf life and not in a separately upstream dilution process to a ready to use Diluted recipe Need to become, but be diluted just before spraying in the spray nozzle can.

Is solved this task according to the invention by anhydrous compositions for the treatment of the surface of a Mold for forming or forming containing 30 to 95% oil, 0 to 55% liquid or liquefied Polyolefin and / or paraffin wax, 5 to 40% emulsifier or emulsifying acting agent, wherein the emulsifier of the composition a gives self-emulsifying character, and optionally 0 to 10% more additives.

The Compositions of the invention are essentially anhydrous. The term "anhydrous" is intended in the context of present invention mean that at no point a water additive to the in as possible pure form used ingredients. Lowest water content can however, due to hygroscopicity of individual ingredients. However, these amounts are usually less than 1% of the composition and preferably the compositions of the invention stored so that less than 0.5% water in the compositions is available.

The products according to the invention guarantee due to their freedom from water low transport costs and claim in storage the lowest possible volume. Furthermore, can in the preparation of the products of the invention as far as possible on biocide additives be waived for a particularly good storage, however, it may prove beneficial haltbarkeitsverlängernde additions to a limited extent.

Suitable oils for the composition according to the invention are in particular synthetic oils, in particular polysiloxanes, mineral oils, vegetable oils or animal oils. Polysiloxanes can functionalized with side groups or partially crosslinked. Mixtures of at least two of these suitable oils can in Be present within the scope of the invention.

When vegetable oils are e.g. Castor oil, Soybean oil, Sunflower oil or flaxseed oil suitable. examples for synthetic oils, which preferably present in the context of the present invention could be, are oleates, e.g. Glycerol trioleate. For mineral oils both heavy or light oils be used. As a typical example, the "Heizdampfzylinderöl" can be called.

The in the context of the invention suitable polyolefin or paraffin waxes include in particular polyethylene, polypropylene, ethylene / propylene copolymers and the respectively partially oxidized compounds, or polybutene. It can be used to optimize the effect of the composition according to the invention be advantageous mixtures of at least two of these compounds to be used as a wax component.

The Compositions of the invention contain one or more emulsifiers, which in total characterized, the composition self-emulsifying character to rent. Already by slight movements or mixing operations be from the products of the invention obtained in conjunction with water emulsions. Form the emulsions Immediate and have one Wide mixing range properties such as homogeneity and re-emulsifiability on.

For the composition according to the invention In particular, all nonionic emulsifiers and are emulsifying acting agents or mixtures thereof, as long as they are in their sum of the composition according to the invention give a self-emulsifying character. Corresponding emulsifiers are known in the art and can easy because of their properties than for the present invention be recognized and used appropriately.

in the According to the invention suitable emulsifiers or emulsifying acting Means or their mixtures show a good solubility in the further constituents of the composition according to the invention.

in the Within the scope of the invention in the composition in small amounts (0 to 5%) contain substances be that the property profile of the composition in an advantageous Influence the way in which, when selecting these substances special Care must be taken to ensure that the additives are not significant Deterioration of the release and lubricant effect of the composition to lead allowed to. The skilled person can easily recognize or quantity and type of additives through preliminary experiments. As particularly suitable Additives can Wetting agents, preservatives, viscosity regulators or agents for Improvement of the lubricating effect, the removability of the workpiece the shape, the thermal and / or electrical conductivity or insulation are used.

Examples for wetting agents are surface active Means, e.g. ethoxylated fatty acids or ethoxylated alcohols, Care must be taken that only such alcohols are suitable are that do not lead to a separation of the mixture.

suitable Preservatives are e.g. Bactericides containing e.g. based are mixtures prepared from isothiazolin.

When Additives for improving the lubricating and separating properties and Means for improving removability of the workpiece from the mold are, for example, Teflon-type compounds, micronized Siloxane resin beads or different types of pigments, all of which are Are known in the art.

When Additives to improve the thermal and / or electrical conductivity or insulation are generally suitable for this purpose known means.

The Composition according to the invention can after appropriate dilution with water in the usual Way to be applied to the forms. Ideally become the properties of the invention the compositions utilized by none in a separate step diluted on application recipe Emulsion is used, but the emulsion consisting of the composition according to the invention and the diluent in specially for that designed facilities, such as a spray robot, produced immediately before or simultaneously with the application becomes.

Surprisingly was in fact determined that the composition of the separating agent according to the invention or lubricant makes it possible, that in one for that designed spray robot with an aqueous solvent within a short distance to the exit from the spray nozzle one sufficiently fine distribution is achieved and a homogeneous lubricant emulsion with excellent release and lubrication properties.

The Composition according to the invention guaranteed in addition to a good emulsifiability further properties that their Applicability in plants, especially in sprayers, facilitate. When particularly advantageous property of the composition according to the invention is their reversible emulsifiability (so-called re-emulsifiability) to name, which is a bonding all liquid-carrying elements of the application system prevented.

By the products of the invention is the possibility given to a separate mixing or dilution device to renounce. The compositions of the invention allow the user to use simple control technology to or lubricant composition and thus the separation performance of To vary compositions in a wide range. This is it is possible in all conceivable fields of use of the composition according to the invention and the varying demands of metalworking and metalworking Steps an optimal dilution of the release or lubricant composition to choose. Furthermore may be the usual in classical lubricants or release agent compositions, logistically unfavorable separate production of release and lubricant emulsions omitted.

In a further preferred embodiment of the invention are used as emulsifiers or as emulsifying Alkoxylated, especially ethoxylated, saturated and unsaturated fatty acids or their esters, alkoxylated, in particular ethoxylated, saturated and unsaturated Alcohols or a mixture of at least two such emulsifiers or emulsifying agent used.

If a side-group-functionalized polysiloxane in the composition of the invention is present, the structure of the page groups is largely variable as long as the properties of the polysiloxane are not clear changed negatively become. Particularly suitable side groups are alkyl, aryl, Call alkylaryl or polyether groups. The size of the page groups is generally not limited, but preferred Groupings containing 1 to 30, more preferably 3 to 14 carbon atoms contain.

The anhydrous compositions according to the invention may for example be sprayed by means of a spraying device comprising a spray element with a spray nozzle for dispensing the treatment medium, a first supply line for supplying anhydrous composition to the spray element, a second supply line for supplying water to the spray element, and one of the first Feed line and the second supply line with the spray nozzle connecting mixing channel comprises. When using this spraying device, the anhydrous composition can be brought together with water just before exiting the spray nozzle in the mixing channel of the spray element. In this case, the mixing ratio of anhydrous composition and water can be adjusted in a simple manner by influencing the amount of anhydrous composition fed via the first feed line per unit time and / or influencing the amount of water fed in per unit time via the second feed line. For example, the amounts of anhydrous composition or water added per unit of time may be be varied by varying the pressure in the respective supply line.

The The following example is intended to further explain the invention.

example 1

One organic oil functionalized with organic groups (alkylaryl) (Wacker TN, Wacker Chemie, Burghausen, DE) is treated with polyalphaolefin (PAO 9, Chevron Phillips) and glycerol trioleate (Radia 7363, Fina oleochemicals N.V., The Netherlands). The mixture will last for 30 minutes stirred to form a homogeneous composition. After that are emulsifier (ethoxylated fatty alcohol, Rhodasurf CET / 5, Rhodia Geronazzo S.p.A., Italy) and a small amount of bactericide (Acticide MV14, Thor Chemie GmbH, Speyer, DE) for protection against bacterial growth added. The mixture is stirred at room temperature for 30 minutes until a homogeneous mixture is achieved.

The final composition of the release agent and lubricant is: 29.95% organomodified polysiloxane 15.00% polyalphaolefin 30.00% Glycerintrioleate 25.00% emulsifier 0.05% bactericide

Example 2

In the accompanying 1 a spray device according to the invention is shown roughly schematically in the form of a block diagram. The spraying device 10 includes a spray element 12 with a spray nozzle 13 , Via a supply line 14 becomes the spray element 12 Anhydrous composition from a designated reservoir 16 via a pump 18 fed. Furthermore, the spray element 12 via a supply line 20 Water from a reservoir 22 via a pump 24 fed. In a diaphragm valve 26 The anhydrous composition and the water are mixed in a common channel 28 introduced to the spray nozzle 13 leads. In the usually only a few centimeters long mixing channel 28 Due to its excellent mixing properties, the anhydrous composition mixes almost instantaneously with the water, so that at the spray nozzle 13 the finished mixed treatment medium emerges.

After opening the diaphragm valve 26 Thus, the mixing ratio at which the anhydrous composition mixes with water to the treatment medium depends only on the amounts of anhydrous composition and water per unit time. These quantities supplied per unit time can be determined, for example, by influencing the in the supply lines 14 and 20 to be varied according to the prevailing pressure. This variation possibility is in 1 simplified thereby indicated that a control unit 30 via signal lines 32 and 34 the operation of the pumps 18 and 24 controls. In addition, flow meters 36 and 38 be provided, which detect the per unit time funded amounts of anhydrous composition and water and signal lines 37 and 39 to the control unit 30 Report back, so that there is a closed loop.

In addition, in 1 nor the supply lines 40 and 42 to detect for the supply of blowing air, via a diaphragm valve 44 and a blast air duct 46 with the spray nozzle 13 are connected. With the help of this blowing air, the treatment medium formed from anhydrous composition and water is atomized in the region of the spray nozzle. With 48 and 50 are in 1 the supply lines of control air for actuating the diaphragm valves 26 and 44 designated.

Claims (14)

Anhydrous composition for the preparation of a treatment medium for the treatment of the surface of a mold or forming mold comprising from 30 to 95% of an oil, from 0 to 55% of a liquid or liquefied polyolefin and / or paraffin wax, from 5 to 40% of an emulsifier or of an emulsifying agent By means of which the emulsifier imparts a self-emulsifying character to the composition, and optionally 0 to 5% of one or more additives. Composition according to Claim 1, characterized that an oil from the group comprising a polysiloxane, one with side groups functionalized polysiloxane, a partially crosslinked polysiloxane, a synthetic oil, a mineral oil, a vegetable oil, an animal oil, or a mixture of at least two such oils. Composition according to Claim 1 or 2, characterized that the polyolefin and / or paraffin wax by partial oxidation liquefied is. A composition according to any one of claims 1 to 3, characterized in that a polyolefin and / or paraffin wax from the group comprising partially oxidized polypropylene, partially oxidized ethylene / propylene copolymer, polybutene and the respective unoxidized waxes, or a mixture of at least two of these Waxes is included. A composition according to any one of claims 1 to 4, characterized in that an emulsifier or emulsifying acting agent from the group comprising alkoxylated saturated and unsaturated fatty acids and their alkyl esters, alkoxylated saturated and unsaturated alcohols or a mixture of at least two of these emulsifiers or emulsifying effective means is included. Composition according to Claim 2, characterized that it is functionalized with the side groups of the groups with side groups Polysiloxane to alkyl, aryl, alkylaryl or polyether groups is. Composition according to Claim 6, characterized that the side groups 1 to 20, preferably 3 to 8 carbon atoms contain. A composition according to any one of claims 1 to 7, characterized in that as additives wetting agents, preservatives, Viscosity regulators and / or agents for improving the lubricity, the detachability of the workpiece from the mold, the thermal and / or electrical insulation available are. A composition according to any one of claims 1 to 8, characterized in that the HLB value of the emulsifiers greater than 10 is. Process for the preparation of a composition according to one the claims 1 to 9, characterized in that one or more waxes and one or more oils with one or more emulsifiers or emulsifying agents and optionally additives are mixed to homogeneity. Method according to claim 10, characterized in that that mixing under heating he follows. Spraying device ( 10 ) for spraying a treatment medium prepared using an anhydrous composition according to any one of claims 1 to 9, comprising: - a spraying element ( 12 ) with a spray nozzle ( 13 ) for dispensing the treatment medium, - a first supply line ( 14 ) for supplying anhydrous composition to the spray element ( 12 ), - a second supply line ( 20 ) for supplying water to the spray element ( 12 ), and - a first supply line ( 14 ) and the second supply line ( 20 ) with the spray nozzle ( 13 ) mixing channel ( 28 ). Process for preparing a treatment medium using an anhydrous composition according to any one of claims 1 to 9 in a spraying device ( 10 ) according to claim 12, characterized in that the anhydrous composition only immediately before exiting the spray nozzle ( 13 ) in the mixing channel ( 28 ) of the spray element ( 12 ) is combined with water. A method according to claim 13, characterized in that the mixing ratio of anhydrous composition and water by influencing the over the first supply line ( 14 ) supplied per unit time amount of anhydrous composition or / and influencing the over the second supply line ( 20 ) is adjusted per unit of time supplied amount of water.