Insulating polyurethane composition
(57) Abstract:Use: in the manufacture of structural and electrical products, operated at temperatures up to 180° C. the inventive composition comprises polyol as one component of the composition. wt%: polyoxypropylene mol 500-35; polyoxypropylene molsaeo-22.6; talc 35; zeolite 7: Aerosil 0.4. and isocyanate component composition wt%: 4,4-diphenylmethanediisocyanate 50-60. 2.2-diphenylmethanediisocyanate 35-50; 2.4-diphenylmethanediisocyanate to 100. modified products of partial trimerization 2.4-toluylenediisocyanate or a mixture of isomers of 2,6 - 24± 3%-toluylene diisocyanate at a molar ratio of from 6535 to 20:80, respectively , when the total content of NCO-rpynn. equal 24 01; 3%, and the ratio of the product of partial trimerization to a mixture of isomers, is equal to from 20 to 80 4060, respectively Composition utverjdayut at 20°C for 4 h and at 60°C for 6 h 1 table.
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
FIELD: polymer materials.
SUBSTANCE: invention, in particular, relates to employment of polyisocyanate compositions as binders for such materials as oriented wood chipboards as well as to binding lignocellulose material. Composition of invention contains polyisocyanate prepolymer, which product obtained by reaction of (i) polyisocyanate containing mixture of diphenylmethanediisocyanate isomers and at least one polyether polyol with (ii) polymerized alkylene units including at least 15% ethylene oxide units, said polyether polyol being prepared using water and low-molecular polyols as initiators. Binding of lignocellulose material comprises following stages: bringing lignocellulose material into contact with polyisocyanate composition; applying mold grease based on wax or metal-containing soap onto surface of lignocellulose composite; and creating conditions for binding of indicated material. Thus fabricated boards possess density at a level of 650 kg/m3 and internal binding strength (V20-IB) at a level of 673 kPa.
EFFECT: improved quality of produce.
13 cl, 8 tbl, 10 ex
FIELD: polymer production.
SUBSTANCE: invention is concerned with a method for preparing prepolymer for use in delivery device for single-component foamed material via polymerization of mixture containing (A) isocyanate components, (B) polyol component containing one or several polyols to impart rigidity to foamed material and (C) low-viscosity component non-reactive toward isocyanate and hydroxyl groups. Disclosed prepolymer preparation process comprises stage of removing free diisocyanate monomer from the prepolymer to a level below 2% after polymerization of mixture containing A, B, and C components or after polymerization of mixture containing A and B components followed by adding C component. Free diisocyanate monomer is removed from prepolymer using elevated temperatures and/or reduced pressures, e.g. by means of thin-layer distillation. Once distillation is completed, prepolymer jointly with commonly used additives, such as cell stabilizers, foaming agents, propellants, and catalysts, is placed in suitable delivery container.
EFFECT: increased strength of foamed material and reduced content of diisocyanate monomer therein.
2 cl, 2 tbl, 4 ex
FIELD: polymer production.
SUBSTANCE: invention relates to process of producing elastomeric polyurethane material having Shore hardness up to 5 (DIN 53505), density 500 kg/m3 or higher (DIN 53420), compressive load (40%) deflection 600 kPa or less (DIN 53577), and elasticity 25% or less (ISO 8307). Process is accomplished by interaction of (i) polymethylene-polyphenylene-polyisocyanate with average isocyanate functionality 2.4 or more; (ii) polyol with average equivalent mass at least 500 and average nominal hydroxyl functionality 2-4; (iii) polyoxyalkylenemonool with nominal hydroxyl functionality 1 and average equivalent mass at least 500; and (iv) optional additives and auxiliary substances known per se in amount less than 5%. Reaction is carried out at index 90-110 and equivalent amount of polymer (iii) lies within a range of 25-80% based on accessible NCO equivalents. Elastomeric polyurethane material accordingly obtained is a soft gel-like material showing some degree of tackiness. Advantageously, this material is obtained using as little additives and auxiliary substances as possible, which results in reduced content of washed out products and residual reactive group in elastomeric polyurethane material. The latter can be employed in vehicle interior objects such as elbow-rests and instrumentation panels, in bicycle sittings, and in mouse tappets.
EFFECT: improved consumer's quality of elastomers.
1 tbl, 12 ex
SUBSTANCE: invention concerns multicomponent local foam system for obtaining foam polyurethanes for local construction purposes, consisting of polyisocyanate (component A), and polyene containing water (component B), stored in separate containers, and epoxy resin based on bisphenol A and bisphenol F, and/or siloxane forpolymer with average mol weight from 200 g/mol to 10000 g/mol with reactive end alcoxy groups (component C), generic catalyst for polyurethane generation reaction and/or generic binding agent for siloxane forpolymer (component D) in spatially divided form, and optional filler, one or more colourants or pigments and generic additives. When mixed, the components of foam system form interpenetrating polymer mesh structure out of foamed polyurethane and at least one other polymer, with excellent adhesion to adjoining wall material, thus reducing water penetration or forming mechanically stable cork in case of fire to render resistance to fire. Claimed foam system is foaming and solidifying in severe conditions on construction site, e.g. at temperatures from 0°C to 40°C, and non-homogeneously filling of volume.
EFFECT: sealing of fractures and/or through orifices in building walls and/or floors.
23 cl, 2 tbl, 2 ex
SUBSTANCE: composition is characterised with viscosity 1500-25000 mPa·s at 25°C and contains fine-dispersed material 1-80 wt % at total polyol composition in polyol with equivalent weight 500 to 5000 and average nominal hydroxyl functionality 2 to 6, representing polyoxyethylene polyoxypropylene polyol with oxyethylene content 15-49 wt % at total oxyalkylene where oxyethylene group 20-80% being arranged on ends of polymer chains. Fine-dispersed material contains polyol reaction interaction with equivalent weight to 400, and diphenylmethandiisocyanate optionally containing its homologs with isocyanate functionality 3 or more, and/or modified versions of such polyisocyanates. There is also disclosed production process of such polyol compositions, and another polyol composition being mixed declared polyol composition and polyesterpolyol with average equivalent weight 500 or more, other than used to produce the composition specified above. There is also disclosed production process of elastic polyurethane foam with using said polyol compositions. Block (plate-shaped) or moulded elastic foam plastics are made of such polyol compositions.
EFFECT: improved load-sensitive characteristics, good fire resistance, easily recycled, internal defectless.
10 cl, 2 tbl
SUBSTANCE: invention relates to a method of producing polyisocyanurate polyurethane material which is used for making soles of football boots and ski boots, automobile parts, for example armrests, door panels, backseat panels and visors. The method involves reacting polyisocyanate and a polyol component, which is capable of reacting with isocyanate, where the reaction is carried out at isocyanate index ranging from 150 to 1500 and in the presence of a trimerisation catalyst. Polyisocyanate consists of a) from 80 to 100 wt % diphenylmethanediisocyanate, which contains at least 40 wt % 4,4'-diphenylmethanediisocyanate and/or derivative of said diphenylmethanediisocyanate, which is liquid at 25°C, with NCO index equal to at least 20 wt % (polyisocyanate a) and b) 20 to 0 wt % of the other polyisocyanate (polyisocyanate b). The polyol component consists of a) from 80 to 100 wt % polyether polyol with average nominal functionality ranging from 2 to 6, average equivalent weight ranging from 150 to 1000, average molecular weight ranging from 600 to 5000, content of oxyethylene (OE) ranging from 75 to 100 wt %, and c) from 20 to 0 wt % of one or more other compounds which are capable of reacting with isocyanate, except water, where amount of polyol a) and compound b) are rated for total amount of polyol a and compound b).
EFFECT: obtained materials exhibit high shock resistance and cohesion strength, are resistant to effects of different temperatures and inflammability, have short demoulding time and are less brittle.
2 cl, 6 ex, 1 tbl, 1 dwg
SUBSTANCE: invention relates to a polyol composition used in synthesis of flexible polyurethane foam, as well as to a method of preparing the said composition. The said composition has viscosity of 1500-25000 mPa·s at 25°C and contains fine-dispersed material in (polether)polyol, having equivalent weight of 500-5000 and average nominal hydroxyl functionality of 2-6, and in amount of 35-80 wt % in the entire polyol composition. The fine-dispersed material contains products of reacting polyol with equivalent weight of up to 400 and which is an alkanol-amine in which the alkanol groups have 2-6 carbon atoms and diphenylmethane diisocyanate and optionally homologues containing it, where the said homologues have isocyanate functionality equal to or greater than 3, and modified versions of such polyisocyanates. The fine-dispersed material has glass-transition temperature of at least 75°C, and at least 90 vol. % of the fine-dispersed material has particle size equal to or less than 10 mcm. The method of preparing the composition is realised in conditions with high shear agitation and temperature is kept below 150°C. Temperature is kept at least 10°C higher than glass-transition temperature Tc of the fine-dispersed material formed at the stage for emulsifying polyol with equivalent weight of up to 400, in (polyether)polyol with equivalent weight of 500-5000, at temperature 20-100°C and subsequent addition of polyisocyanate to the emulsion.
EFFECT: composition can be transported in more concentrated form, can be diluted onsite and foam plastic made from the composition have good refractory properties and are easy to chemically regenerate.
11 cl, 3 ex, 3 tbl
SUBSTANCE: present invention relates to a method of preparing a reactive polyurethane composition, as well as a reactive polyurethane composition prepared using the said method, and to use of the said composition as a single-component reactive adhesive or as a coating. The polyurethane composition is obtained in two steps, where the first and/or second step takes place at temperature between 80 and 140 °C. Monomer-free thermoplastic polyurethane containing groups which are reactive towards isocyanate is obtained at the first step. A polymer or a mixture of polymers containing at least 90 wt % linear molecules, both reactive towards isocyanate, reacts with polyisocyanate with molecular weight <500 in molar deficiency of isocyanate groups in polyisocyanate relative terminal groups of a polymer or mixture of polymers which are reactive towards isocyanate. At the second step, the obtained thermoplastic polyurethane reacts with a prepolymer with low monomer content and with terminal isocyanate groups. Molar ratio of thermoplastic polyurethane terminal groups which are reactive towards isocyanate to prepolymer isocyanate groups ranges from 1:1.1 to 1:5.
EFFECT: obtained reactive polyurethane compositions have low residual content of diisocyanate monomers which may not be specially labelled, and also have high initial strength which facilitates their efficient use as single-component hot melt adhesives or coatings.
21 cl, 4 ex, 1 tbl
SUBSTANCE: invention relates to novel foam modifiers for producing flexible foam. Flexible foamed polyurethane with density of less than 128 kg/m3 is obtained by reacting an aromatic polyisocyanate component with functionality of at least approximately 2.0, with a component capable of reacting with isocyanate, which contains one or more polyoxyalkylenepolyester polyols having 2-8 hydroxyl groups with OH number between approximately 11 and approximately 280, and containing less than 30 wt % copolymerised oxyethylene from the weight of oxyethylene, and a foam modifier. The foam modifier contains 35-75 wt % of at least one low-molecular weight compound selected from a group consisting of 1,3-propanediol, 1,3-butanediol and 1,4-butanediol and their mixture, 20-60 wt % of one or more polyester polyols containing 2-8 hydroxyl groups per molecule with OH number from approximately 11 to approximately 280, and containing more than 50 wt % compolymerised oxyethylene from the weight of oxyethylene, and 5-25 wt % dipropylene glycol. The reaction takes place in the presence of one or more foaming agents, one or more catalysts and one or more surfactants.
EFFECT: improved operational characteristics and properties of flexible foam.
25 cl, 11 tbl
FIELD: preparation of compositions for cables filling.
SUBSTANCE: the invention is pertaining to preparation of compositions for filling the cables used in the field of a distant data transmission. Prepare a composition containing (in mass %): a mineral or a synthetic oil - 70-90, the hydrogenated block of styrene and butadiene copolymer with radial structure - 2-15, polyethylene wax - up to 12. The block of the copolymer can be synthesized using silicon tetrachloride or stannic chloride. The technical result of the invention consists in improvement of the index of compositions drops-protection and a stability augmentation.
EFFECT: the invention ensures improvement of the index of compositions drops-protection and a stability augmentation.
7 cl, 2 tbl, 3 ex
FIELD: polymer materials.
SUBSTANCE: polymer composition suitable for use in various national economy branches, in particular in cable industry, is constituted by, weight parts: chloroprene rubber or its combination with butadiene-nitrile rubber, 100; zinc oxide as vulcanization agent, 1-5; vulcanization accelerator selected from group: sulfur, thiuram, diphenylguanidine, Captax, or a mixture thereof, 1.0-3.25; vulcanization activator selected from group: magnesium oxide and stearic acid, 3.5-10.0; stabilizer: acetonanyl, diaphene FP, naphtam-2, 2-3; dibutyl phthalate as plasticizer, 10-20; paraffin as antiozonant, 2-8; fillers: carbon black 47-52 and kaolin 5-22; polybutadiene as modifier, 0.1-10.0; and, additionally, alumina trihydrate, 50-60.
EFFECT: enabled preparation of composition showing resistance to flame propagation, low fume evolution, high frost and oil resistance with physico-mechanical characteristics preserved.
2 cl, 3 tbl
FIELD: production of protecting and corrosion-resistant materials by impregnating fibrous base with antiseptic and corrosion-resistant compounds.
SUBSTANCE: material is made in the form of low-twist yarn of flat section from bast-fiber or mixed filaments having linear density of 1,500-3,500 tex and twist rate of 20-50 per 1 m. Yarn is reinforced with high-strength thread consisting of synthetic filaments having linear density of 60-120 tex or bast-fiber filaments having linear density of 200-600 tex. Rupture load of reinforcing thread is 30-60% of rupture load of yarn. Material is also impregnated with compound including 12-28 wt% of liquid non-volatile or low-volatile low-viscosity petroleum products used as filler, 0.2-1.5 wt% of product of reaction of aromatic hydrocarbons with isobutylene as antiseptic.
EFFECT: increased workability and covering capacity, high fungi-resistance and strength, in particular, on usage of jute filament and Capron thread, and impregnation compound based on transformer oil and antiseptic.
5 cl, 1 tbl, 12 ex
SUBSTANCE: insulating compound is proposed, mainly for the manufacture of components for the cable industry, which contains: 70-100 parts by volume of a polymer material, 5-30 parts by volume of a ceramic filler (2), the surface of which is treated with a bifunctional coupling agent in an amount of 0.1 wt % to 4 wt %, based on the ceramic filler, 0.1 to 5 parts by volume of the crosslinking agent, 0 to 6 parts by volume of the conductive carbon powder (3); And 0-6 bulk fractions of whiskers (4) ZnO. The method of manufacturing an insulating composition comprises surface treatment of a ceramic filler with a bifunctional coupling agent, followed by its mixing with a polymeric material and a crosslinking agent in the presence of ZnO.
EFFECT: improvement of dielectric strength, heat resistance, durability and reliability of cable products manufactured from material declared insulation composition.
24 cl, 4 dwg, 5 tbl, 19 ex