Polyurethane composition

FIELD: chemistry.

SUBSTANCE: invention concerns quickly solidifying polyurethane-based polymer compositions with enhanced adhesion to metal surfaces and can be applied in production of protective coatings, sealing glues, mastics, particularly for sealing of perforated holes in paper-making machines. Composition includes polyfurite urethane forpolymer, liquid solidifier based on 3,3'-dichlor-4,4'-diaminodiphenylmethane and polyoxytetramethyleneglycol with molecular weight of 1000 at mol ratio of 0.95:0.1, aerosil, and additionally contains glycidylmetacrylate as adhesion additive, and can include di-(2-ethylhexyl)phthalate as plastifyer.

EFFECT: obtaining composition with high adhesion to metal surfaces and improved thixotropy without impairing high physical and mechanical characteristics level.

2 tbl, 6 ex

 

The invention relates to bathroomvanities polymer compositions based on polyurethane with high adhesion to metal surfaces and can be used for the manufacture of protective coatings, adhesives-sealants, mastics, in particular for sealing of perforated holes of the paper machines.

Known polyurethane composition used in repair work for sealing holes of the tanks of vehicles (SU 1581725 A1 from 09.10.87,, IPC C08L 75/08, SC 13/02 invention "Polyurethane composition").

The composition contains, by mass:

Simple hydroxyl-containing polyester
with mol. weight of 400-2000100,0
2,4-toluylenediisocyanate104,0-116,0
The methyl methacrylate100,0-105,0
Methyl-1,4-diazabicyclo-2,2,2-octane0,5-2,0
Furrowy alcohol4,0-10,0
Aerosil5,0-13,0

Known composition possesses high strength and adhesion properties, but cannot be used to create coatings on vertical metal surfaces due to the low technological properties, thixotropy, viscosity of the material.

Closest to savla is my song composition and technical nature of a polyurethane composition according to patent RU 2237069 from 25.02.2003,, IPC C08L 75/04 invention "Polyurethane composition containing the following components:

Polimorfny urethane prepolymer
SKU-PFL-10074,58-77,75
Aerosil0,01-0,05
Liquid hardener based
3,3'-dichloro-4,4'-diaminodiphenylmethane
and polyoxyethyleneglycol
with a molecular weight of 1000
when a molar ratio of 0.7:0,2Rest

At sufficiently high values of strength parameters the disadvantage of this structure is the low level of adhesion to metal surfaces.

The technical problem to be solved in the framework of the present invention is to provide a polyurethane composition having high adhesion to metal surfaces, improved thixotropy while maintaining a high level of physical and mechanical characteristics.

The solution of the above problem is due to the fact that the polyurethane composition comprising polimorfny urethane prepolymer, liquid hardener based on 3,3'-dichloro-4,4'-diaminodiphenylmethane and polyoxyethylene the Kohl with a molecular weight of 1000, Aerosil contains liquid hardener based on 3,3'-dichloro-4,4'-diaminodiphenylmethane and polyoxyethyleneglycol with a molecular weight of 1000 at a molar ratio of 0.95:0,1, and additionally contains as adhesive additives - glycidylmethacrylate and probably contains as a plasticizer di(2-ethylhexyl)phthalate, in the following ratio between the components of the polyurethane composition, wt.%:

Polimorfny urethane prepolymer SKU-PFL-10073,09-69,36
Glycidylmethacrylate5,85-5,55
Aerosil1,1-1,04
Di(2-ethylhexyl)phthalate0-1,96
Liquid hardener based
3,3'-dichloro-4,4'-diaminodiphenylmethane
and polyoxyethyleneglycol
with a molecular weight of 1000
in a molar ratio of 0.95:0,1Rest

As part of the inventive polyurethane composition is used polimorfny urethane prepolymer, which is a product of the interaction of 1.0 mole of polyoxyethyleneglycol with a molecular weight of 1000 (polifonica) THE 6-02-646-81 and 2 moles of 2,4-toluylene diisocyanate (p is oduct T) (TO-38-95-90).

As the liquid hardener is used, the curing agent (crosslinking agent) on the basis of aromatic amine 3,3'-dichloro-4,4'-diaminodiphenylmethane (Diameter X) (TU 6-14-980-84) and polyoxyethyleneglycol with a molecular weight of 1000, taken in a molar ratio of 0.95:01.

As adhesive additives used glycidylmethacrylate (TU 6-02-1338-86).

As a thixotropic additive composition contains Aerosil grades a-300 GOST 14922-77 representing a pure silicon dioxide in the form of loose bluish-white powder.

As a plasticizer to provide the necessary level of "survivability" of the order of 15-20 minutes, sufficient for the application and allows one to drain the applied composition to a metal surface, use of di(2-ethylhexyl)phthalate (GOST 8728-88).

Manufacturing process of polyurethane composition consists of the following operations:

synthesis of prepolymer on the basis of 2,4-toluylene diisocyanate and polyoxyethyleneglycol with a molecular weight of 1000;

- cooking liquid hardener;

- preparation of a polyurethane composition;

the polymerization of the composition.

Synthesis of the prepolymer is carried out in a closed reactor synthesis at a temperature (65-70)°when vacuum pressure minus 0.09 MPa and operating the mixer.

Liquid hardener is prepared in a vessel heated when the permanent stirring until complete dissolution of Diamete X, while in preheated (40-45° (C) payforit with a molecular weight of 1000 at atmospheric pressure loaded weighed Diamete X and other additives.

Mixing the prepolymer and the liquid hardener is performed at a temperature (60-70)°C. the Polymerization of the composition is carried out at (15-35)°C for 18-24 hours.

The claimed range of ratios between the components are determined experimentally and are optimal from the point of view of structure formation of the polyurethane matrix, allowing the achievement of high complex physico-mechanical characteristics of the finished material.

This composition can be used both independently and as adhesive compositions for the base layer of polyurethane coating.

To increase the shelf life delivery to the customer in the form of two chemically inactive compounds (prepolymer and liquid hardener with additives), which separately can be stored for 12 months or more.

The technical essence of the present invention is illustrated by the following experimental data.

Table 1 presents the formulation of polyurethane compositions, and in table 2 - characteristics of the reaction mixtures and polyurethane elastomers obtained on their basis, in comparison with the prototype. For comparison, similar tests were carried out for the comp the positions of the prototype.

From table 1 and 2 shows that most of the physico-mechanical characteristics (hardness, tear resistance, tensile strength) the composition according to the invention is not inferior to the prototype, and the level of adhesion to metal even better than the known composition, i.e. the invention solves the task.

From the data presented in table 2, it is seen that the best adhesion and strength properties are achieved when the ratio between the components is within the claimed range.

The compositions of examples with 2,6 beyond the quantitative values of components have worse characteristics than the industrial design composition as example 6 does not provide the necessary level of strength characteristics, and example 2 shows a lower adhesion to metal and drains with vertical surfaces due to the low content of thixotropic additives.

Thus, when testing the inventive polyurethane composition based on polimorfnogo prepolymer is achieved the required level of protective properties (adhesion to metal, tear resistance, hardness) and are provided with improved technological properties required viscosity and thixotropy of the material.

td align="center"> -
Table 1
The content in the composition in % (mass fraction)
The components of the composition1 (prototype)Examples of specific performance
23456
Polimorfny urethane prepolymer SKU-PFL-10074,58-77,7575,073,0971,069,3665,0
Aerosil0,01-0,050,71,041,071,11,5
Glycidylmethacrylate-5,35,55the 5.75,856,0
Di(2-ethylhexyl)phthalate-1,001,01,963,0
Liquid hardener based on 3,3'-dichloro-4,4'-diaminodiphenylmethane and polyoxyethyleneglycol mol. the weight of 1000 when a molar ratio of 0.95:0,1-1820,3221,2321,7324,5
Liquid hardener based on 3,3'-dichloro-4,4'-diaminodiphenylmethane and polyoxyethyleneglycol mol. the weight of 1000 when a molar ratio of 0.7:0,2Rest----

Table 2

The properties of the reaction mixtures and

polyurethane-based materials
The compositions of table 1, in examples
123456
The viability of the reaction mixtures, min, at a temperature of 25°-25201815-
Hardness shore a, used (GOST 263)969491929190
Tensile strength at break at a temperature of (23±2)°C, MPa (GOST 270-75)43,233,135,736,228,821,8
Tear resistance, MPa (GOST 11529-86)829286867167
Adhesion to Me, MPa (GOST 209-75)6,47,413,014,115,113,5
Thixotropy (the ability of the material does not drain from the ceiling, vertical and horizontal surfaces is TEI) flowsdoes not flow

Polyurethane composition comprising polimorfny urethane prepolymer SKU-PFL-100, liquid hardener based on 3,3'-dichloro-4,4'-diaminodiphenylmethane and polyoxyethyleneglycol with a molecular weight of 1000, Aerosil, characterized in that the composition contains a liquid hardener based on 3,3'-dichloro-4,4'-diaminodiphenylmethane and polyoxyethyleneglycol with a molecular weight of 1000 at a molar ratio of 0.95:0,1, and additionally contains as adhesive additives - glycidylmethacrylate, and possibly as a plasticizer di(2-ethylhexyl)phthalate in the following ratio, wt.%:

polimorfny urethane
the prepolymer of the SSI-PFL-10073,09-69,36
glycidylmethacrylate5,85-5,55
Aerosil1,1-1,04
di(2-ethylhexyl)phthalate0-1,96
liquid hardener based on 3,3'-dichloro-4,4'-
diaminodiphenylmethane and
polyoxyethyleneglycol with molecular
the weight of 1000 in a molar ratio of 0.95:0,1 rest



 

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FIELD: chemistry.

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EFFECT: enhanced efficiency.

1 tbl, 10 ex

FIELD: chemistry of polymers, chemical technology.

SUBSTANCE: invention relates to polyurethane foam/polyisocyanurate strengthened by glass fibers and a method for their synthesis. Method involves the following steps: (1) contacting isocyanate component of viscosity in the range from 200 to 600 mPa x s, component based on polyhydric alcohol comprising the first polyhydric alcohol and representing derivative of sorbitol, the second polyhydric alcohol of a simple polyether type and the third polyhydric alcohol of polyester type. Abovementioned polyhydric alcohols show viscosity in the range from 200 to 600 mPa x s, and reaction is carried out in the presence of catalysts chosen from tin salts, potassium carboxylates and in the known cases tertiary amines, physical and/or chemical swelling agent, emulsifier and, if necessary, a flame retardant agent; (2) impregnation with a composition prepared at step (1), package of glass fibers, and (3) foaming and hardening abovementioned composition to form strengthened foam-block containing glass fibers package. Prepared strengthened foam-block shows mean density in the range from 115 to 135 kg/m3 but from 120 to 130 kg/m3 preferably, above about 130 kg/m3, and isocyanate number in the range from 100 to 180 but from 130 to 180 preferably. Also, invention describes a method for synthesis of polyurethane foam/polyisocyanurate for transporting liquefied gas, in particular, tanks for transport of liquefied methane.

EFFECT: improved method of synthesis.

4 cl, 6 tbl

FIELD: petrochemical processes.

SUBSTANCE: invention relates to a method for production of bitumen-polyurethane compositions designed mainly for manufacturing road, protective, insulation, and anticorrosive coatings. Modification of bitumen comprises interaction of bitumen bulk with prepolymer preliminarily prepared from components containing polyol and isocyanate groups, interaction being carried out at 60-140°C for 0.25-1 h, said components with polyol groups being polyethers and groups of polyuoxypropylene glycols and polyethylene(butylene) glycol adipates with functionality at least 2, whereas components with isocyanate groups are 2,4-tolylene diisocyanate, provided that molar ratio OH/NCO is 1:2 and amount of prepolymer corresponds to 1-10 wt % of the weight of bitumen.

EFFECT: achieved production of material with lowered brittleness temperature and water absorption, raised softening temperature, increased adhesion and elongation strength, and enhanced corrosion resistance.

2 tbl, 28 ex

FIELD: polymer production.

SUBSTANCE: liquid hardener for prepolymers with terminal isocyanate groups, used in molding-mediated manufacture of polyurethane elastomer products, is composed of, wt parts: 3,3'-dichloro-4.4'-diaminodiphenylmethane 3.2-13.2, polyetherpolyol having molecular weight 1000-2000 (as nonvolatile solvent) 84.8-95.9, N.N'-tetraoxypropylenediamine having molecular weight 290 - 0.7-2.9.

EFFECT: enabled manufacture of molded polyurethane elastomers with reduced rigidity level and high strength characteristics level.

16 ex

FIELD: polymer materials.

SUBSTANCE: invention relates to formulations of polyurethane elastomers, which can be used for manufacturing articles involving molding techniques. Composition of invention contains, wt parts: urethane prepolymers based on 2,4-tolylene diisocyanate and polytetramethylene oxide diol having molecular weight 1400, 100, and those based on 2,4-tolylene diisocyanate and oligobutadienediol having molecular weight 2000, 120-160; curing agent: 3,3'-dichloro-4,4'-diaminodiphenylmethane, 7-9; and nonvolatile solvent-hardener consisting of 2,6-diethylhexyl sebacate, 35-45, and polytetramethylene oxide diol having molecular weight 1000, 70-80. In this way, high-strength cross-linked elastomers are prepared with modulus value 1.2-1.6 MPa at ambient temperature and with modulus value no higher than 3 MPa within a temperature range up to -50°C, while retaining strength at least 15 MPa.

EFFECT: increased frost resistance of articles and enabled operations with such articles under low-temperature conditions.

1 tbl, 11 ex

FIELD: building materials industry; methods of production of the compacted building materials containing the polyurethane elastomer and the caoutchouc.

SUBSTANCE: the invention is pertaining to the compacted building material containing the polyurethane elastomer and the caoutchouc and to the method of production of the material. The method of production of the material includes mixing, forming and compaction of the source materials and may be used at the construction, decorative and engineering works. The material includes the mixture of the polyurethane elastomer formed in situ by the reaction of the polyurethane prepolymer having the end isocyanate groups with the polyol, and caoutchouc. The caoutchouc is selected from the group including the natural rubber, the synthetic rubber, the initial either reused caoutchouc or their mixture. The polyurethane elastomer is taken in the amount from 5 up to 40 mass %. The compacted material contains, if necessary, one or several additives. The material produced under the invention possesses the good mechanical properties and, possibly, has the fire-resistance, the electrical insulation, the water-isolation and the aesthetic properties.

EFFECT: the invention ensures production of the compacted material with the good mechanical properties, and, possibly, with the fire-resistance, the electrical insulation, the water-isolation and the aesthetic properties.

28 cl, 4 ex

FIELD: petrochemical processes.

SUBSTANCE: bitumen modification process accomplished by introducing polymer additive into bitumen is characterized by that, before introduction of polymer additive, isocyanate component selected from 2,4-tolylenesiisocyanate and polydiisocyanate is added to bitumen to form active isocyanate groups therein and two-component mixture resulting therefrom is then aged, while polymer additive utilized is selected from functionalized polyesters and polyethers, in particular from polyethylene-butylene glycol adipate, polyoxypropylenediol, and polyoxypropylenetriol, which interact with active isocyanate groups present in bitumen to form polyurethane composition with bitumen/polyurethane ratio (95-67):(5-33).

EFFECT: improved physicochemical characteristics of bitumen-polyurethane composition.

2 tbl, 3 ex

FIELD: process.

SUBSTANCE: invention concerns rubber compound and pneumatic tire, tread of which is made of this rubber compound. Rubber compound includes from 15 till 100 weight fractions of sol chain silicon dioxide, dispersed in isopropanol, possessing average aspect ratio L1/D between branched particles A-A, containing branched particles A in the range of from 3 till 30, from 1 till 20 weight fractions of silaned bonding agent for 100 weight fractions of rubber component, containing diene rubber, vulcanising agent, such as sulphur, and vulcanisation accelerator, where L1 corresponds average distance between branched particles A-A, containing branched particles A, and D corresponds effective diameter of primary particle. At that mentioned particle A corresponds particle, which is contacted at least by three other particles.

EFFECT: improvement of adhesion characteristic with wet and dry road surface at holding of rolling resistance characteristic.

3 cl, 2 dwg, 2 tbl, 2 ex

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