公开了一种通过将胺和异氰酸酯同时注入混合室来制备含尿素粉末的方法。 该方法包括在高压冲击混合装置中在至少2500psi的压力下混合少于10秒的时间。 所得的含尿素粉末具有确定的粒度和分子量分布以及异氰酸酯和胺官能团的化学计量摩尔比。 还公开了使用剪切增稠步骤用含脲粉末制备增稠的含聚脲母料的方法,以及通过在加热和油的存在下使第一或第二含脲粉末胶凝来制备润滑脂的方法。 ......

  • 专利类型:

    发明专利

  • 申请/专利号:

    EP2021763168

  • 申请日期:

    2021-07-22

  • 专利申请人:

  • 分类号:

    ["C10M115/08","B01F25/00","B29B7/76","C10M119/24","C10M171/06","C10N20/06","C10N70/00"]

  • 发明/设计人:

    WEI, LIWEN

  • 权利要求: 1. A method of making a urea containing powder, comprising: injecting at least one liquid amine and at least one liquid isocyanate simultaneously into a mixing chamber, said mixture chamber comprising at least one high pressure impingement mixing device; mixing the at least one amine and the at least one isocyanate in the at least one high pressure impingement mixing device at a pressure of at least 17,24 MPa (2500 psi) for a time sufficient to form a first urea containing powder with substantially no unreacted isocyanates, said time is less than 10 seconds, wherein the first urea containing powder has an average particle size,(D50, determined via laser light scattering) represented as D1, and particle size distribution (D90-D50, determined via laser light scattering) represented as DD1; feeding the first urea containing powder into a sizing device to form a second urea containing powder with an average particle size (D50, determined via laser light scattering) represented as D2, wherein D2 is less than D1, and particle size distribution (D90-D50, determined via laser light scattering) represented as DD2, wherein DD2 is less than DD1, wherein the second urea containing powder composition has a stoichiometric mole ratio of isocyanates and amine functionalities.2. The method of claim 1, wherein D1 ranges from 0.1 micron to 100 micron and DD1 ranges from 1 micron to 100 micron, or wherein D2 ranges from 0.1 micron to 30 micron and DD2 ranges from 1 micron to 50 micron.3. The method of claim 1, wherein said at least one amine and at least one isocyanate are mixed in the chamber at a pressure ranging from 17,24 MPa (2500 psi) to 48,26 MPa (7000 psi).4. The method of claim 1, wherein said mixing and feeding are performed continuously performed in the absence of solvents and base oils to produce a di-urea or polyurea containing dry powder, or where said mixing time is less than 5 seconds.5. The method of claim 1, wherein the first urea powder is made in the presence of at least one solvent or base oil that is added either with the isocyanate, the amine or both in an amount that does not change the particle size characteristics of the powder, preferably where solvent is present in amount up to 50% by weight of the isocyanate, the amine or both and is stripped/removed after the first urea powder is made, or preferably where the base oil is present in amount of up to 30% by weight of the isocyanate, the amine or both.6. The method of claim 1, wherein (a) the amine functionalities are chosen from aliphatic, cyclic, aromatic amines, primary or secondary, linear or branched, mono or diamine, alcohol or alkoxy containing amines, and mixtures thereof; (b) the amine is chosen from lauryl, stearyl, or tallow amines, cyclohexyl and dicyclohexyl amine, benzylamine, aniline, diamine, mono or polyetheramine and mixtures thereof; or (c) the isocyanate is chosen from methylene diphenylene diisocyanate, and monomeric or polymeric toluene di-isocyanate.7. The method of claim 1, wherein the sizing device is selected from an air or mechanical impact mill or combinations thereof, wherein the air impact mill comprises an air classification device or an air jet, and the mechanical impact mill is selected from a pin mill, ball mill, hammer mill or screen mill.8. A method of forming a thickened polyurea containing master batch, comprising the method of making a urea containing powder of claim 1, further comprising at least one shear thickening step to form the thickened polyurea containing master batch, the at least one shear thickening step comprising a continuous shear driven process that includes mixing dry powder comprising the urea containing powder with at least one base oil, wherein the urea containing powder and base oil are mixed in a weight ratio ranging from 5/95 to 95/5.9. The method of claim 8, wherein the thickened polyurea containing master batch is mixed using a device chosen from a twin screw extruder, a rotor stator mixer, an internal mixer, or homogenizer, preferably wherein the thickened polyurea containing master batch is mixed with a device that will allow it to be extruded in the form of a noodle, paste, or extrudate,preferably wherein the master batch produced via twin screw extruder has at least maintain or further reduce a particle size distribution D1, DD1, D2, DD2 or combinations thereof, and more preferably wherein the noodle, paste, or extrudate include urea containing master batch having an average particle size (D50, determined via laser light scattering) ranging from 0.1-50 micron.10. The method of claim 8, wherein the base oil used in making master batch is chosen from paraffinic oils, naphthenic oils, hydrocracked oil (Group I/II/III), alkylbenzene, Group IV and V synthetic oils or combinations thereof.11. A method of forming a polyurea grease, comprising the method of making a urea containing powder according to claim 1, further comprising forming a polyurea grease by gelling under heat the second urea containing powder in the presence of an oil to form a gelled product, and milling the gelled product to produce a polyurea grease with a smooth consistency such that the grease is free of discernible or measurable lumps or other irregularities, and dropping point at least 250°C.12. The method of claim 11, wherein (a) the gelling under heat is performed in an opened or sealed grease kettle, or any reactor vessels suitable for oil dispersion; or (b) the gelling temperature ranges from 100°C to 180°c; or (c) milling is performed using a three-roll colloid mill, or homogenizer.13. A method of forming a polyurea grease, comprising the method of forming a thickened polyurea containing master batch of claim 8, further comprising forming a polyurea grease by dispersing the thickened polyurea containing master batch in the presence of an oil using one or more dispersing vessels to form a dispersion, and milling the dispersion to produce a polyurea grease with smooth consistency such that the grease is free discernible or measurable lumps or other irregularities, and dropping point at least 250°C.14. The method of claim 13, wherein the dispersing vessel is selected from a high speed mixer, pin mill, ball mill, open kettle, or any vessel suitable for oil dispersionor wherein dispersing is performed at a temperature ranging from ambient to 160°C.15. A method of forming a polyurea grease, comprising the method of forming a thickened polyurea containing master batch of claim 8, further comprising a continuous process for forming a polyurea grease, said continuous process comprises feeding said base oil into the continuous shear driven process at rate more than 2268 kg ( 5,000 pounds) per hour.

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