Water-miscible metal working fluids with reduced aerosol inhalation toxicity

A metalworking, water-miscible technology, used in the petroleum industry, lubricating compositions, etc., that can solve problems such as low lung toxicity and low unsaturation levels

Inactive Publication Date: 2007-07-25
BAYER MATERIALSCIENCE AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is well known to those skilled in the art that some of the low equivalent weight base catalyzed commercial products mentioned in the previous reference ECETOC Technical Report 55 have low levels of unsaturation and low lung toxicity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] This example employs a product-to-product process with continuous addition of starter (CAOS), wherein the product tails (from butanol and propylene oxide / epoxide) are added to the reactor at the start of the batch process. Ethane is prepared by the CAOS method, the hydroxyl value is about 35 mg KOH / g), a mixture of ethylene oxide and propylene oxide is added to activate the catalyst, and after activation, the starter or initiator is continuously added to the reactor , while adding one or more alkylene oxides. A double metal cyanide (DMC) catalyst prepared according to US Patent No. 5,482,908 was used in all examples. 2500 grams of product tails were charged to a 20 kg reactor along with DMC catalyst (0.87 grams). The mixture was dehydrated under nitrogen at 130°C for 30 minutes under vacuum. The catalyst was activated with 125 grams of mixed epoxides (50% by weight propylene oxide, 50% by weight ethylene oxide) fed at 130°C. After the pressure in the reactor dropped ...

Embodiment 2

[0045] The steps described in Example 1 were repeated, except that the ratio of ethylene oxide / propylene oxide was 35 / 65, and the amount of n-butanol added was reduced to produce a polyether having a hydroxyl value of about 17 mg KOH / g. The number average equivalent weight of the obtained product was 3187 g / mol, the viscosity at 37.8°C was 2060 SUS, the cloud point (1%, in water) was 40°C, and the LC of 4 hours aerosol exposure 50 The concentration is greater than 5.38 mg / L.

Embodiment 3

[0047] A semi-batch process is used in which the alkylene oxide is added to the starter without a continuous starter feed. 5426 grams of a product similar to that described above in Example 1 and DMC catalyst (0.9 grams) were charged to the reactor. The mixture was dehydrated under nitrogen at 130°C for 30 minutes under vacuum. The catalyst was activated with 271 grams of mixed epoxides (50% by weight propylene oxide, 50% by weight ethylene oxide) fed at 130°C. After the pressure drop in the reactor confirmed catalyst initiation, propylene oxide (6204 g) and ethylene oxide (6204 g) were simultaneously added to the reactor within 5 hours to generate a compound with a hydroxyl number of about 10 mg KOH / g. Polyether. The product has a number average equivalent weight of 5968 g / mol, a viscosity of 5340 SUS at 37.8° C., a cloud point (1%, in water) of 56° C., and a LC of 4 hours of aerosol exposure. 50 The concentration is less than 5.9 mg / L.

[0048] As can be seen with refere...

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Abstract

The present invention provides a process for producing a water-miscible metalworking fluid involving combining about 90 wt.% to about 5 wt.%, based on the weight of the fluid, of water and one or more additives chosen from plasticizers, chelating agents, biocides, surfactants, dispersants, dyes, odorants, extreme pressure agents, anti-oxidants and corrosion inhibitors with about 10 wt.% to about 95 wt.%, based on the weight of the fluid, of a polyether polyol produced by mixing an active hydrogen compound with a double metal cyanide (DMC) catalyst in a reactor vessel, charging to the reactor vessel a mixture containing two or more alkylene oxides to activate the catalyst, and continuously feeding one or more alkylene oxides to produce the polyether polyol, wherein a 1% solution in water of the polyether polyol has a cloud point of from greater than about 32 DEG C to less than about 53 DEG C, the polyether polyol has a number average equivalent weight of from greater than about 1,000 Da to about 10,000 Da, and a four-hour aerosol inhalation exposure to the polyether polyol has a LC50 of greater than about 5 mg / L. The water-miscible metalworking fluid produced by the inventive process may find use in cooling and / or lubricating metal surfaces during one or more of grinding, cutting, boring, drilling and turning of metal parts.

Description

[0001] This application is a continuation-in-part of earlier application Serial No. 11 / 332071, filed January 13, 2006, and claims priority to that earlier application. technical field [0002] The present invention relates generally to functional fluids, and more particularly to providing effective cooling and lubrication of metal surfaces at high speeds while reducing aerosol inhalation (aerosol) during grinding, cutting, boring, drilling and / or turning of metal parts. inhalation) toxic water-miscible synthetic metalworking fluids (MWF). Background technique [0003] Metalworking methods perform mechanical forming and processing of metal parts or workpieces. Metalworking fluids (or metal removal fluids) are commonly used for the lubrication of metal cutting and forming knives. These fluids also provide cooling to the tool, facilitating the removal of cutting chips or debris from the tool-workpiece interface and helping to provide an acceptable post-machined finish. Becaus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M173/02C10N40/20
CPCC10N2240/401C10M2209/108C10M2209/104C10M173/02C10M2209/105C10N2230/64C10N2040/22C10N2030/64
Inventor G·G·库姆斯E·P·布朗尼
Owner BAYER MATERIALSCIENCE AG
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