A method of obtaining a molded urethane elastomers |
|
IPC classes for russian patent A method of obtaining a molded urethane elastomers (RU 2107073):
 The method of producing polyurethane foams / 2098434
The invention relates to the production of polyurethane foams and concerns a method for obtaining polyurethane foam plastics, in which the foaming is produced using pure nitrogen as a pore-forming means
 The method of obtaining polyetherurethanes modifier to nitrocellulose paints and varnishes / 2091406
The invention relates to methods of synthesis of polyetherurethanes in organic solvents and allows you to get the modifier "Plaster RK-0130 (TU 84-7509103.351-92) with adjustable viscosity, designed to improve the quality nitrocellulose lacquer materials, and represents a 30 - 45% solution in butyl acetate of a product of the interaction of polifonica with diisocyanate
 The method of producing polyurethane / 2078773
The invention relates to the synthesis of polyurethane elastomers with improved physical-mechanical properties: tensile strength, elongation, tear resistance, high cyclic durability
 The method of obtaining models moulds / 2073028
The method for obtaining solutions of linear polyurethanes / 2050373
The invention relates to the field of synthesis of polyurethanes in solution of organic solvents and intended for artificial skin, finishing materials during chemical cleaning, as the polymer layers of semi-permeable gas diffusion materials (membranes), coatings on fabrics in the manufacture of composite materials for various purposes, as a binder in the manufacture of printing inks, sealants, insulating materials in construction, electronics, electrical engineering and t
 Catalytic system suitable for the manufacture of polyurethane coating composition for producing polyurethane coating, the method of obtaining / 2024553
The invention relates to the field of synthesis of polyurethane curable coatings using catalysts and can be used in paint industry
 Method of producing elastic polyurethane foam cold forming and activating the mixture for its implementation / 2103279
The invention relates to the field of technology for elastic monopolarity in the presence of a catalyst, and may find application in the manufacture of gaskets furniture and upholstered car seats
 The way to obtain in closed form elastic polyurethane foam product and elastic polyurethane foam products / 2100383
The invention relates to the chemistry of polyurethanes and concerns a method for obtaining the closed form elastic polyurethane foam products used in the furniture industry, vehicles and so on
The method of producing polyurethane foams / 2098434
The invention relates to the production of polyurethane foams and concerns a method for obtaining polyurethane foam plastics, in which the foaming is produced using pure nitrogen as a pore-forming means
 Polyol as one component of isocyanate foams with reduced flammability / 2098432
The invention relates to the production of foams with reduced Flammability based on isocyanates and can be used in the manufacture of thermal insulation in industrial and civil construction at the place of use
 A method of obtaining a hard moulded polyurethane foam / 2080336
The invention relates to the field of production of rigid moulded polyurethane foam and can be used in various industries for manufacturing of large-sized products of variable thickness and complex configuration
 The way to obtain hydroxyl-containing component for the production of flexible molded polyurethane foam / 2076877
The invention relates to polyurethane chemistry and relates to a method of obtaining a hydroxyl-containing component for the manufacture of flexible molded polyurethane foam (PUF), which can be used in the furniture and automotive industries
 The method of producing polyurethane foam / 2076115
The invention relates to methods for producing a rigid polyurethane foam used in the manufacture of refrigeration equipment, construction, etc
 The method of producing polyurethane and composition to obtain / 2073027
The invention relates to a method for producing a polyurethane elastomer, fluoropolymer flexible segments and isocyanate terminal groups
Mixture for obtaining flexible polyurethane foam / 2326132
Invention pertains to the mixture for obtaining flexible polyurethane foam and can be used as mastic for hydro and thermal insulation of foundations, buildings, pipelines, as well as for filling cavities in building structures. The mixture contains defined ratios of the following components: a hydroxyl containing oligomer-copolymer of butadiene and piperylene with molecular mass of 2100 and containing 0.92% hydroxyl groups; isocyanate component - polymethylene polyphenyl isocyanate with 29-31% content of isocyanate groups; catalysts: dibutyl tin dilaurate and N,N,N- triethylamine; water; glycerine; polydimethyl siloxane and polydimethyl siloxane modified by a polyester in the form of foam stabilisers and extra bitumen. Use of bitumen considerably lowers moisture absorption of the material and increases viscosity of the foam systems. This also enables the material to retain the density attained during foaming. Use of defined foam stabilisers in the mixture enables formation of more fine cells, with high stability and attainment of low density of the polyurethane foam.
|
(57) Abstract: The invention relates to methods for molding urethane elastomers with high strength properties and may find application in engineering, for example, for the manufacture of coating rolls of paper machines, rollers assemblies of sheet metal and other bulky items. The method of obtaining castable urethane elastomers lies in the interaction of the prepolymer on the basis of polyoxyethyleneglycol and 2,4-toluylene diisocyanate with a content of isocyanate groups of 6.1 to 7.2% with a solution of 3,3'-dichloro - 4,4' -diaminodiphenylmethane in two - or trifunctional polyetherpolyols and the prepolymer at a molar ratio of 3,3' -dichloro - 4,4'- diaminodiphenylmethane, polyetherpolyols and prepolymer equal(0,87 - 0,90) : (0,10 - 0,13) : 0,05 when using the bifunctional polyester and(0,94 - 0,95) : (0,05 - 0,06) : 0,05 when using trifunctional polyester, respectively, per 1 mol of the initial prepolymer. Application for dissolution of 3,3' -dichloro - 4,4'-diaminodiphenylmethane except polyetherpolyols, the prepolymer with terminal isocyanate groups allows to obtain a stable at room temperature a solution with high concentration is and properties and high viability of the reaction mass, which is very important for the manufacture of roll covers and other large items. table 1. The invention relates to the production of polymeric materials and can be used for the manufacture of coating rolls of paper machines, rollers assemblies of sheet metal, rolls for textile machines, coating calender rolls used in the manufacture of magnetic tapes and for the manufacture of other large items. A method of obtaining castable urethane elastomers by reacting the prepolymers with terminal isocyanate groups with molten diamine - 3,3'- dichloro - 4,4'- diaminodiphenylmethane (P. Wright and other Polyurethane elastomers. Chemistry, 1973; Urethane elastomers. Ed. by N. P. Apukhtin. L.: Chemistry, 1971). The elastomers obtained by a specified method, have high strength properties (tensile strength at break of 40-50 MPa). The disadvantage of this method is the low viability of the reaction mass (5-10 min) after injection of molten diamine, which greatly complicates the manufacture of large-sized products. The number of known methods for obtaining molded urethane elastomers, which increases the of groups with a solution of 3,3'-dichloro-4,4'-diaminodiphenylmethane in various polyether polyols for example, a copolymer of propylene oxide and tetrahydrofuran (ed. St. USSR N 553259). However, the elastomers obtained by a specified method, have low strength characteristics (p12,0 MPa) and are mainly used as sealants. A method of obtaining castable urethane elastomers by reacting the prepolymer with terminal isocyanate groups, obtained on the basis of polybutadiene and 2,4-toluylene diisocyanate with a solution of 3,3'-dichloro-4,4'-diaminodiphenylmethane simple polyetherpolyols, which used a copolymer of propylene oxide and ethylene oxide with a mole.mass 5000 ( ed. St. USSR N 1597365, class C 08 G 18/32). This method is adopted for the prototype. The elastomers obtained by the described method, are mainly used as a binder for composite materials, the disadvantages are their low strength properties, the tensile strength is less than 7.3 MPa at 23oC. The purpose of the invention to provide a castable urethane elastomers with high strength properties while maintaining high viability of the reaction mass. The aim is achieved in that in a method of producing injection molded urethanes is unctionally of polyether polyols and prepolymer-based polyoxyethyleneglycol and 2,4 - toluylene diisocyanate with a content of isocyanate groups of 6.1 - 7.2% in the following molar ratio of diamine : the bifunctional polyol : a prepolymer: (0,87-0,9) : (0,1-0,13) : 0,05; diamine : trifunctionally polyol : a prepolymer(0,94-0,95) : (0,05-0,06) : 0,05 on 1 mol of the initial prepolymer. First preparing a saturated solution of 3,3'-dichloro-4,4'-diaminodiphenylmethane in polyetherpolyols at a temperature of 85-105oC, and then at a temperature of 95-100oC add a prepolymer with terminal isocyanate groups, which chemically binds the excess of diamine in excess of the limit of its solubility at a temperature of 25-30oC, and the resulting liquid diamine also dissolves part of 3,3'-dichloro-4,4'-diaminodiphenylmethane. So, get stable at a temperature of 25-30oC the solution with a high concentration of the diamine in the above molar ratio of polyetherpolyols and the prepolymer. Comparative analysis of the proposed solutions with the prototype shows that in the present method, unlike known for dissolving 3,3'-dichloro-4,4'-diaminodiphenylmethane use except polyetherpolyols a prepolymer with terminal isocyanate groups, which chemically binds to part of 3,3'-dichloro-4,4 di aminophenylamino, and components - diamine, polyetherpolyols and the prepolymer are taken in a specific molar ratio, respectively: for two-functional polyetherpolyols(0,87-0,9) : (0,01-0,13) : 0,05; for trifunctional of polyetherpolyols(0,94-0,95) : (0,05-0,06) : 0,05 on 1 mol of the initial prepolymer. This allows us to conclude that the proposed method has a "novelty" and meets the criterion of "inventive step". Through the use of aggregate distinctive essential features of the proposed method allows to obtain a castable urethane elastomers with high strength properties at high viability of the reaction mass, which can, in turn, produce coatings of large shafts or other castings of high quality. This makes it possible to draw a conclusion on the conformity of the proposed technical solution the criterion of "useful effect". Example 1. Charged to the reactor to reach 232.5 g (0.87 mol) of 3,3'-dichloro-4,4'-diaminodiphenylmethane and 133,3 g (0.13 mol) of polyoxyethyleneglycol. The mixture is heated to a temperature of 85-105oC and stirred until complete dissolution, then enter to 68.8 g (0.05 mole) of the prepolymer on the basis of polyoxyethyleneglycol and cooled to 25-30oC. the resulting solution is mixed under vacuum at room temperature for 15 min with 1377 g (1 mol) of the original polymer synthesized on the basis of polyoxyethyleneglycol and 2,4-toluylene diisocyanate, then pour samples for the determination of the viability of the reaction mass and strength properties of elastomers. Example 2,3,4 are manufactured analogously to example 1 with the ratios shown in the table. Example 5. Charged to the reactor 251 g (of 0.94 mol) of 3,3'-dichloro-4,4'-diaminodiphenylmethane and 192,0 (0.06 mol) of polyoxypropyleneglycol - Laprol 3203. The mixture is heated to a temperature of 85-105oC and stirred until complete dissolution, then enter to 68.8 g (0.05 mole) of the prepolymer on the basis of polyoxyethyleneglycol and 2,4-toluylene diisocyanate with a content of NCO - groups 6.1%, and stirred at a temperature of 95 - 100oC for 15 min and cooled to 25-30oC. The resulting solution is mixed under vacuum at room temperature for 15 min with 1377 g source prepolymer synthesized on the basis of polyoxyethyleneglycol and 2,4-toluylene diisocyanate, then pour samples for the determination of the viability of the reaction mass and strength properties of elastomers. The proposed method can be obtained urethane elastomers with similar properties, in which during preparation of the solution of diamine use other two - and trifunctionally the polyether polyols in the mixture of prepolymer on the basis of polyoxyethyleneglycol and 2,4-toluylene diisocyanate. From the analysis of analogs and prototypes, as shown above, we can conclude that the highest strength properties of urethane elastomers obtained when using as the curing agent of the melt of the aromatic diamine in a pure form (viability 5-10 min). Use as hardeners solutions diamine in various polyether polyols with terminal hydroxyl groups with the aim of improving the viability of the reaction mixture leads to the decrease of the strength characteristics, conditional stress at 100% strain and hardness of the resulting elastomers. To preserve the high strength properties of urethane elastomers necessary to minimize the introduction of polyether polyols. The proposed method allows to obtain a stable solution of the diamine in the small of siderites small amount of prepolymer - 0.05 mol per 1 mol of the initial prepolymer based polyoxyethyleneglycol and 2,4-toluylene diisocyanate, with a content of isocyanate groups of 6.1-7.2% and to obtain a urethane elastomers with high strength properties while maintaining high viability of the reaction mixture (see table). The table shows the characteristics of urethane elastomers, obtained by the proposed method with a minimum content of polyetherpolyols and the prepolymer. Further reduction of the molar content of polyetherpolyols with terminal hydroxyl groups and prepolymer in the solution of the hardener outside of the claimed method is not desirable because it leads to bicrystalline diamine of the solution. Increasing the molar content of polyether polyols leads to deterioration of the strength properties of elastomers, and the increase in the content of the prepolymer is to increase the viscosity of the hardener solution. On the basis of the proposed method of development of new grades of urethane elastomers of the type LOURE-90 high strength properties and high viability of the reaction mass, which enables to produce one large products for different purposes. The way to receive is based hydroxyl-containing oligomer and 2,4-toluylene diisocyanate with a solution of 3,3'-dichloro-4,4'-diaminodiphenylmethane simple polyetherpolyols, characterized in that the prepolymer using a prepolymer based polyoxyethyleneglycol and 2,4-toluylene diisocyanate with a content of isocyanate groups of 6.1 to 7.2 mol.%, as a simple polyetherpolyols two or trifunctionally polyetherpolyols and solution pre-enter at 95 - 100oWith the prepolymer at a molar ratio of 3,3'-dichloro-4,4'-diamino-difenilmetana, polyetherpolyols and prepolymer equal(0,87 - 0,90): (0,10 - 0,13) : 0,05 in the case of the bifunctional polyester and(0,94 - 0,95) : (0,05 - 0,06) : 0,05 if trifunctional polyester, respectively, per 1 mol of the initial prepolymer entered after cooling the reaction mixture to 25 - 30oC.
|
