The sealing composition
(57) Abstract:The invention relates to the field of production of two-component compounds with increased strength and can be used to seal the membrane elements. The effect is achieved that the polyurethane compound comprising isocyanate component, the hydroxyl-containing component and the catalyst, as the isocyanate component used is a prepolymer based on 4,4'-diphenylmethanediisocyanate and mixtures of polyoxypropyleneglycol m 200 m and 2000 in the ratio 61,5 : 5,80 : 8,30-80,0 : 18,0 : 29,1. As hydroxyl-containing component is a mixture of polyoxy of propylene glycols m 1000 m and 2000 and nitrogen polyester m 200 m in the ratio: 0,01 : 0,01 : 1,40-73,60 : 75,00 : 31,00. As the catalyst - dibutylthiourea tin, in the following ratio of components, wt.h.Hydroxyl-containing component 1
Isocyanate component - 0,80-1,22
Catalyst - 0,013-0,016 n The invention relates to the production of two compounds based on polyurethane and can be used to seal the membrane elements, including medical devices, as well as other purposes.Famous PU-compound-based forpremium oil or a mixture of trimethylolpropane with a ratio of CO:IT 1-1,6-1.However, the composition has a long curing time of 1 h at 20oC and 0.5 h at 50oC.The closest to the invention is a sealing composition comprising a urethane prepolymer, liquid divinely rubber with terminal hydroxyl groups and a catalyst.Urethane prepolymer based on deviceloop rubber contains 2.8 to 4.2% of the isocyanate groups.Curing of the composition occurs in the presence of triethanolamine.The disadvantage of the sealing composition is not sufficiently high strength (table, example 1), which does not allow its use for sealing membrane elements operating at high pressure filtered liquid (in particular ultrafiltration water purification).This invention is directed to receive sealant composition with increased strength for sealing membrane elements for various applications, including medical.The effect is achieved that the sealing composition including a urethane prepolymer, a hydroxyl-containing component and the catalyst, as the urethane prepolymer contains a prepolymer based on 4,4-diphenyl is 8 8,3 80,8 18 29,1, as hydroxyl-containing component is a mixture of polyoxypropyleneglycol mol. m 1000 and 2000, respectively, and ethoxylated Ethylenediamine mol. m 200 at a ratio (wt.h.) 0,01 0,01 1,4 73,6 75,0 31,0 respectively, as catalyst dibutyltindilaurate tin in the following ratio of the components of the composition (wt.h.):
A prepolymer based on 4,4-diphenylmethanediisocyanate and mixtures of polyoxypropyleneglycol mol. m 200 and 2000 0,8 1,22
A mixture of polyoxypropyleneglycol mol. m 1000 and 2000 ethoxylated Ethylenediamine mol. m 200 1,0
Dibutyltindilaurate tin 0,013 0,016
Use in sealing compositions of prepolymer based on 4,4-diphenylmethanediisocyanate and mixtures of polyoxypropyleneglycol different weights and hydroxyl-containing component in the form of a mixture of polyoxypropyleneglycol different molecular weight and nitrogen-containing polyester can improve the durability of the sealing compositions, without significant changes in other properties. This increase in strength is achieved by the fact that the aforementioned ratio of components allows to synthesize polyurethane polymer with a certain ratio of flexible and rigid units in the macromolecule.As raw materials for po THE 6205
Laprol 202 THE 6-05-221-826-86
Lupranol 294 THE 6-05-1881-80
4,4-Diphenylmethanediisocyanate THE 113-03-604-86
For experimental verification of the claimed sealing compositions were prepared 14 formulations (table).To obtain samples of the sealant composition was mixed prepolymer, a hydroxyl-containing component was added to the catalyst in the amount of 0.015 wt. including cast samples sealing compositions by the method of centrifugal casting.The strength of the samples was determined by the tensile strength according to GOST 270-75, also was determined elongation at break according to GOST 270-75 and hardness shore a according to GOST 263-75.Example 1 corresponds to the prototype.Example 2 corresponds to the minimum content of 4,4 MDI in the system.Example 3 corresponds to the maximum content of 4,4 MDI in the system.Example 4 corresponds to the minimum content of polyoxypropyleneglycol mol.m. 200 in the prepolymer.Example 5 corresponds to the maximum content POPG mol.m. 200 in the prepolymer.Example 6 corresponds to the minimum content POPG mol.m. 2000 prepolymer.Example 7 corresponds to the maximum content POPG mol.m. 2000 meets isocyanate index 6 in the prepolymer.Example 10 corresponds to the composition which is hydroxylation component is missing POPG mol.m. 1000.Example 11 corresponds to the maximum content POPG mol.m. 1000 in hydroxylation component.Example 12 corresponds to the composition which is hydroxylation component is missing POPG mol.m. 2000.Example 13 corresponds to the maximum content POPG mol.m. 2000 hydroxylation component.Example 14 corresponds to the minimum content of nitrogen-containing polyester mol.m. 200 hydroxylation component.Example 15 corresponds to the maximum content of nitrogen-containing polyester mol.m. 200 hydroxylation component.The sealing properties of the composition given in the table. A sealing composition comprising a urethane prepolymer, a hydroxyl-containing component and a catalyst, characterized in that as the urethane prepolymer contains a prepolymer based on 4,4'-diphenylmethanediisocyanate and mixtures of polyoxypropyleneglycol mol.m. 200 and 20,000, respectively, at a ratio (wt.h.) accordingly 61,5 5,8 8,3 80,8 18 29,1, as the hydroxyl-containing component is a mixture of reproach (wt.h.) 0,01 0,01 1,4 73,6 75,0 31,0 respectively, as the catalyst - dibutylthiourea tin in the following ratio of the components of the composition, wt.h.A prepolymer based on 4,4'-diphenylmethanediisocyanate and mixtures of polyoxypropyleneglycol mol.m. 200 and 2000 0,8 1,22
A mixture of polyoxypropyleneglycol mol.m. 1000 and 2000 and ethoxylated Ethylenediamine mol.m. 200 1
Dibutyltindilaurate tin 0,013 0,016$
FIELD: organic chemistry, polymer materials.
SUBSTANCE: polyester-polyols are obtained by double metalcyanide catalyzed polyaddition of alkylenoxide to starting material containing active hydrogen atoms. Alkylenoxide is continuously fed into reactor during induction period while maintaining constant pressure in reactor.
EFFECT: method for polyester-polyol production with decreased induction time.
2 ex, 1 dwg
FIELD: organic chemistry, in particular polyol composition for cold-cured polyurethane production.
SUBSTANCE: claimed composition contains (pts mass): polyethertriol or mixture of polyethertriol with molecular weight of 4500-6500 and average hydroxyl functionality of 3 - 100; ethylene glycol - 3.5-6.2; 1-4-butandiol - 3,5-8,0; triethylene diamine - 0.53-0.65; water - 0.25-0.50; organosilicate foam regulator - 0.002-0.004; and high boiling by-product from isoprene production based on alkyl- and oxyalkyl-substituted dioxacyclanes (e.g., 1,3-dioxane containing 1-4 mass % of hydroxyl groups) as organic filler - 2-100. Said filler may be used in mixture with oil plasticizer. Polyurethane obtained according to present method has Shore A hardness of 20-50, and is useful in automobile industry, and as material for gasket and sealing.
EFFECT: composition for production of polyurethane with increased hardness.
2 cl, 1 tbl, 3 ex
FIELD: polymer materials.
SUBSTANCE: polyurethane resin is a product of reaction of at least one diisocyanate component and isocyanate-reactive components having first group of at least one polyol, second group of at least one polyol, and third group of at least one polyol, at least one amine, and, additionally, reaction-stopping agent, all polyols of the first group having average molecular mass between 1000 and 10000 g/mole, those of second group having average molecular mass between above 10000 and 20000 g/mole, and those of third group having average molecular mass equal to or higher than 800 g/mole. Ratio of diisocyanate component to isocyanate-reactive components is selected such that all isocyanate groups are present as products of reaction with isocyanate-reactive functional groups. Resin is used as film-forming binder in coating compositions, in particular in printing inks for printing on polyolefin substrates. Printing ink is preferably used for manufacturing printed layered articles.
EFFECT: increased gluing ability and heat resistance of ink laid on plastic substrate.
41 cl, 2 tbl, 12 ex
FIELD: polymer production.
SUBSTANCE: polyol polyethers are prepared by cycle-cleaving polymerization of ethylene oxide and at least one alkylene oxide having at least three carbon atoms in molecule and attachable to H-functional initiator in presence of catalyst. H-functional initiator binds up to 40% (based on the weight of final polyol polyether) of ethylene oxide or mixture thereof with aforesaid alkylene oxide with at least 98 wt % ethylene oxide in presence of catalyst, which is at least one basic compound. To thus obtained polyol polyether, at least one alkylene oxide as defined above or mixture of ethylene oxide with the latter containing up to 20 wt % ethylene oxide is chemically added using as catalyst at least one metal cyanide-based compound.
EFFECT: enabled preparation of polyol polyethers with high level of ethylene oxide and low hydroxyl number.
3 cl, 3 tbl, 6 ex
FIELD: polymers, glues.
SUBSTANCE: invention relates to thermoplastic plastics, in particular, to polyurethane and composition containing thereof used for gluing and thickening. Invention describes polyurethane prepared by interaction of: a) polyisocyanate or mixture of two or more polyisocyanates with b) polyol or mixture of two or more polyols comprising simple polyether with molecular mass 4000 Da, not less, polydispersity value 1.5, not above, or hydroxyl functionality from 1.8 to 2.0, or polydispersity value 1.5, not above, and hydroxyl functionality from 1.8 to 2.0, or by a mixture of two or more such simple polyethers in the presence of a component of the general formula (I) given in the appendix 1. After reaction termination polyurethane has at least one silane group able to react with water or its mixture with isocyanate group. Also, invention describes a composition used for thickening and gluing containing a plasticizing agent in mixture with indicated polyurethane and other polyurethane with molecular mass 8000 Da, not above, and at least by 3000 Da less as compared with this value for the first indicated polyurethane. Proposed compositions comprising the claimed polyurethane are useful as contact, single- or two-component glue, thickening mass with rupture elongation up to 287% and destroying charge up to 0.49 N/mm2 and used in sealing seams and surfaces.
EFFECT: valuable properties of composition.
15 cl, 2 ex
FIELD: chemical industry; methods of production of a thermosetting elastomers.
SUBSTANCE: the invention is pertaining to the field of chemical industry, in particular, to the methods of production of a thermosetting polyurethane elastomer and also to the elastomer produced according to the given method. The invention presents the method of production of the polyurethane elastomer having a total apparent density exceeding 150 kg/m3 and providing for an interaction of polyisocyanate and a reactive to isocyanate composition not necessarily at presence of water, according to which the reaction conduct at an isocyanate index of 85-120. At that the polyisocyanate component is composed of: al) 80-100 mass % of diphenylmethanediisocyanate containing at least 40 mass % of 4.4'- diphenylmethanediisocyanate and-or a derivative of the indicated diphenylmethanediisocyanate, which (the derivative) is a may be a liquid at the temperature of 25°C and has NCO value of no less than 20 mass % and a2) 20 mass % of the other polyisocyanate; the reactive to isocyanate composition b) consists of b1) 80-100 mass % of a simple polyol polyester having an average nominal functionality - 2-8, average reactive equivalent weight of 750-5000, an average molecular mass of 2000-12000, the share of oxyethylene - 60-90 mass % and the share of the primary hydroxyl groups of 70-100 mass % calculated for the total number of the primary and the secondary hydroxyl groups in polyol; b2) a reactive to isocyanate extender of the chain in such a quantity, that the ratio of the rigid block makes less than 0.45; and b3) - 20-0 mass % of one or more of other reactive to isocyanate composition excluding water. At that the amount of the polyol of 61) and the reactive to isocyanate composition 63) is calculated from the total amount of the indicated polyol 61) and the composition 63). The invention presents also description of the thermosetting elastomer produced according to the indicated method.
EFFECT: the invention ensures production of a thermosetting polyurethane elastomer.
10 cl, 2 ex
FIELD: polymer production.
SUBSTANCE: invention relates to a method of producing polyether-polyols via catalytic addition of at least two alkylene oxides to H-functional initiators, during which operation at least one oxyalkylene unit is incorporated as a result of joint dosage of at least two alkylene oxides. Catalyst utilized is at least one metal cyanide-based compound. When performing joint dosage ratios of alkylene oxides to each other is varied.
EFFECT: enabled production of polyether-polyols without clouding and having processing-appropriate viscosity.
8 cl, 12 ex
FIELD: polymer production.
SUBSTANCE: in the first step of two-step polymer-polyol preparation, polyether, notably Laprol 5003 or Laprol 5003/Laprol 3003 mixture, is combined with polymer selected from group, including polystyrene, styrene-acrylonitrile copolymer, styrene-butadiene copolymer, acrylonitrile-butadiene-styrene plastic, and mixtures thereof, at temperature 100°C. In the second step, at 90°C and pressure 0.2 MPa, monomer selected from group including acrylonitrile, styrene, acrylate, vinylidene chloride, and mixtures thereof is added before addition of catalyst. Resulting mixture is stirred at 100-110°C and pressure 0.25 MPa.
EFFECT: enabled preparation of stable dispersion, reduced process cycle time, and lowered power consumption.
2 cl, 2 tbl, 5 ex
FIELD: chemistry of polymers, chemical technology.
SUBSTANCE: invention relates to a method for preparing polymer-polyol involving carrying out two stages at increased temperature and pressure. On the first stage polyester of mixture of polyesters of molecular mass 2000-6000 Da and the primary hydroxyl content 40-80% is mixed with a monomer in the reactor volume in laminar regimen. Catalyst is added to the prepared mixture moving in turbulent regimen in tube packing of external contour, and flow is recovered into reactor wherein adduct is prepared at stirring and under conditions of laminar regimen. On the second stage a monomer and catalyst are added to the prepared adduct moving in turbulent regimen in tube packing of external contour of reactor and after mixing in turbulent regimen is fed into reactor wherein under mixing conditions polymer-polyol is prepared. Monomer is taken among the group including styrene, α-methylstyrene, butadiene, acrylonitrile, acrylate, vinylidene chloride or their mixture. Also, invention relates to the polyol dispersed composition, elastic urethane foam and the molded article. Invention provides preparing polymer-polyol with stable sizes of polymeric particles and the le odor-free polyol composition and urethane foam and the molded article with the enhanced carrying capacity.
EFFECT: improved preparing method.
6 cl, 3 tbl, 8 ex
FIELD: chemistry of polymers, chemical technology.
SUBSTANCE: invention relates to a method for preparing polyurethane material, and to material made of in relation with the indicated method. Invention describes a method for preparing polyurethane material showing the vitrification point 25°C, not below. Polymer is prepared by interaction of polyisocyanate component consisting of the following components: a) 80-100 wt.-% of diphenylmethane diisocyanate comprising 4,4'-diphenylmethane diisocyanate and/or variant of indicated diphenylmethane diisocyanate, 40 wt.-%, not less, and 0-20 wt.-% of another polyisocyanate with the isocyanate-reaction composition consisting of the following components: a) 80-100 wt.-% of simple polyetherpolyol with the average nominal polyfunctionality 3-8, average equivalent mass 200-2000 Da, average molecular mass 600-8000 Da, the oxyethylene content 50-100% and the content of primary hydroxyl groups 70-100%; b) reaction elongating agent and/or cross-linking agent taken in the amount wherein the ratio of hardness blocks = 0.60; and c) 0-20 wt.-% of one or some other isocyanate-reaction compounds but excluding water, and material made of the indicated method. Polyurethanes made of the proposed method show density value 957 kg/m3, the Shore hardness value 77 and the virtification temperature 87°C that can be used in making show footings, arm rests, door panels an car sun glass baffle plates.
EFFECT: improved preparing method.
5 cl, 1 tbl, 2 ex