Method of preparing polyols for supple blocked foamed plastics

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

 

The invention relates to a process for the preparation of polyether polyols, obtained by this way the polyether polyols and their use to obtain polyurethanes.

The polyether polyols are used in large quantities to obtain polyurethanes. Obtaining them is in most cases the catalytic attach low alkalisation, in particular ethylenoxide or propylenoxide in the presence of H-functional initiators. As catalysts are used in most cases, alkali metal hydroxides or salts, with the most practical application is potassium hydroxide.

Usually attaching alkalisation provided in the form of block or statistical mixture. At block accession simultaneously joins only one accelerated, when statistical mixture in the reaction mixture is a mixture of alkalisation.

In the technique as alkalisation apply in most cases, the ethylene oxide or propylene oxide, as they are well available and not expensive. Reactivity of ethylene oxide is greater than that of propylene oxide, so that the accession of ethylene oxide occurs at a higher reaction rate. To increase output per unit volume of time upon receipt of the polyether polyols is desirable maintenance high $ is of ethylene oxide in polyetherpolyols. We know this decision, in which the polyether polyols which are designed to get soft foams are supplied with integral ethylenoxide blocks. Due to the associated increase in the number of primary hydroxyl groups of polyether polyols increases their reactivity when interacting with polyisocyanates. However, with the increase of the proportion of ethylene oxide in polyetherpolyols also increases and the hydrophilicity of the polyether polyols which, among other things, may lead to undesirable yellowing of polyether polyols.

In addition, in the synthesis of polyether polyols with long chains, which are used to obtain a polyurethane soft foams, with progressive growth of the chain are adverse reactions that lead to disturbances in the structure of the circuit. These by-products represent unsaturated components, and they lead to a deterioration of the properties rezultirase polyurethanes. Therefore, in the past it was done a large number of attempts to obtain polyether polyols with a low content of unsaturated components. For this purpose, in particular, have been deliberately modified catalysts of alkoxysilane. For example, in EP-A-268 922 proposed the use of cesium hydroxide. This can, however, reduce the content of unsaturated components, however, the cesium hydroxide is expensive and problematic the m substance in relation to its disposal.

Further, it is known the use of complex compounds on the basis of the cyanides of metals, in most cases, hexametrical zinc, also known as DMC catalysts, to obtain polyether polyols with a low content of unsaturated komponentov. There are many sources of information that describe the receipt of such compounds. For example, DD-A-203 735 and DD-A-203 734 know getting polifenoles using hexacyanocobaltate zinc.

Getting hexacyanometallate zinc is known. Typically the obtaining of such a catalyst is carried out in such a way that solutions of metal salts such as zinc chloride, is subjected to the interaction with the solutions of cyanometallates alkaline or alkaline earth metals such as hexacyanocobaltate potassium. To the resulting suspension deposition, as a rule, immediately after the deposition process type mixed with water containing heteroatoms component. This component can also be present in one or both of the original solutions. This is mixed with water containing heteroatoms component may be, for example, a simple ester, polyester, alcohol, ketone or a mixture of them. Such methods are described, for example, in the following U.S. patents: US 3278457, US 3278458, US 3278459, US 3427256, US 3427334, US 3404109.

The polyether polyols used to produce a block of soft foam, as p is Avila, have directly initiated full propylenoxide the indoor unit, which can be up to 40 wt.% total polyol, and at this propylenoxide indoor unit mixed blocks of propylene oxide and ethylene oxide, which may represent at least 60 wt.% total polyol and at least 2 wt.% of ethylene oxide. These polyols can usually get by alkaline catalysis. In WO-A-97/27,236 retrieves the polyol to a block of soft foam, and at least one inner block of propylene oxide is attached with the use of cyanide metals as catalyst. In this way it is impossible to increase the content of ethylene oxide without occurrence of the above-mentioned disadvantages.

The objective of the invention is the development of polyether polyols which have a high content of ethylene oxide, without notable increase in hydrophilicity of products.

This problem is solved in an unexpected way through polyetherpolyols obtained revealing the cycle of polymerization of ethylene oxide and alkalisation with at least 3 carbon atoms, containing an internal unit of ethylene oxide or mixtures of ethylene oxide and alkalisation with at least 3 carbon atoms and after that attach at least one accelerated with at least 3 carbon atoms, or Messi from ethylene oxide and alkalisation with at least 3 carbon atoms, preferably the propylene oxide, and mixed blocks contain preferably at least 2 wt.% and a maximum of 20 wt.% of ethylene oxide, calculated on the mixture.

Thus, the object of the invention are the polyether polyols obtained by revealing the cycle of polymerization of ethylene oxide and of propylene oxide with the accession in the presence of N-functional initiator, wherein the initiator is attached not more than 40 wt.%, in terms of weight polyetherpolyols, ethylene oxide or mixtures of ethylene oxide and alkalisation with at least 3 carbon atoms with the content of ethylene oxide of at least 98 wt.%, in terms of the mixture, and after that attach at least one accelerated with at least 3 carbon atoms or a mixture of ethylene oxide and at least one accelerated with at least 3 carbon atoms, with a maximum content of 20 wt.% of ethylene oxide, calculated on the mixture.

If attach a mixture of ethylene oxide and at least one accelerated with at least 3 carbon atoms, the content of ethylene oxide should be at least 0.5 wt.%, in terms of the mixture.

As alkalisation with at least 3 carbon atoms in the molecule are suitable preferably propylene oxide, butylenes and isobutylene, and any mixture is from at least two of the above alkalisation, particularly preferably propylene oxide.

According to a preferred form of execution polyetherpolyols at the end of the chain, i.e. after joining alkalisation with at least 3 carbon atoms, respectively, a mixture of ethylene oxide and alkalisation with at least 3 carbon atoms, it is possible to add the ethylene oxide.

Preferably the amount of this is attached at the end of the chain of ethylene oxide is a maximum of 15 wt.%, in terms of weight polyetherpolyols. Such polyether polyols are preferably used for obtaining polyurethane foam cold molded. The polyether polyols according to the invention without these end blocks of ethylene oxide preferably used to obtain a polyurethane soft foams, in particular soft block of foam.

Unexpectedly, it was found that the hydrophilicity of the polyether polyols according to the invention when the same amounts of ethylene oxide in the polyether chain is much less than the hydrophilicity of conventional polyether polyols with a different distribution of alkalisation in the chain.

Further object of the invention is a method of obtaining the above-described polyether polyols. Getting polyether polyols according to the invention is implemented by revealing the cycle of polymerization of ethylene oxide and at least one accelerated with by at least 3 carbon atoms to H-functional initiator in the presence of catalysts.

According to a preferred form of execution of the invention the accession of the total number of accelerated carried out in the presence of basic catalysts. As alkaline catalysts can be used, for example, amines, alkali metal salts, metal oxides, and metal hydroxides, hydroxides of alkali and/or alkaline earth metals. In most cases, we apply the potassium hydroxide.

In another preferred form of carrying out the invention as catalysts for joining alkalisation used cyanides metals, also often called the DMC catalysts. The advantages of using such catalysts are, on the one hand, in the high speed connection of alkalisation and, on the other hand, the thus obtained polyether polyols have a low content of unsaturated components. The disadvantage of this form of execution is, however, that the use of DMC catalysts can lead to the delay of response.

In another form of execution of the method according to the invention different parts of the polyester chain attached when using different catalysts. For example, the accession ethylenoxide block at the beginning of the chain using the alkaline catalyst and joining adjacent consisting wholly or advantage is but from alkalisation with at least 3 carbon atoms of the unit using the DMC-catalyst. Located at the end of the chain block of ethylene oxide can also join using DMC catalysts, however, practicelink using basic catalysts. This method has the advantage that the application of catalysts on the basis of the cyanides of metals at the beginning of the reaction can be prevented frequent delay in starting the reaction. However, there are increased costs due to additional purification stages.

When using different catalysts may be necessary cleanup polyetherpolyols from the catalyst before replacing catalysts. In particular, when replacing the alkaline catalysts on DMC-catalysts in most cases, a thorough cleaning, as traces of the alkaline catalyst, in particular in a typical use of hydroxides of alkali metals DMC catalyst can be poisoned.

The object of the invention is further polyurethanes obtained by the interaction of polyisocyanates with compounds with at least two reactive isocyanate groups, hydrogen atoms, characterized in that compounds with at least two reactive isocyanate groups by hydrogen atoms is used, the polyether polyols according to the invention. The polyether polyols according to the invention is preferably used to obtain a polyurethane soft foams, moreover, the polyether polyols without end ethylenoxide unit is used in particular to obtain a block of foam and foam thermoforming, and polyether polyols with terminal ethylenoxide unit is used in particular to obtain foams of cold forming.

As the initiators to obtain polyetherols according to the invention is applied are known for this purpose, multifunctional alcohols with 2 to 8 hydroxyl groups in the molecule. In particular, to obtain the polyether polyols according to the invention to obtain a polyurethane soft foams suitable 2 - and/or 3-functional alcohols, such as ethylene glycol, propylene glycol, glycerin, trimethylolpropane.

The polyether polyols according to the invention have practicelink molecular weight in the range from 1000 to 100000.

As alkalisation suitable, as already mentioned above, the ethylene oxide or alkalinity with at least 3 carbon atoms, in the above mentioned proportions.

Used for the method according to the invention as catalysts cyanides metals have the General formula (I)

M1a[M2(CN)b(A)c]d·fM1gXn· h(H2O)· eL (I),

where M1means a metal ion selected from the group comprising Zn2+Re2+With3+, Ni2+, MP2+With2+Sn2+, Pb2+, Mo4+, Mo6+, Al3+, V4+, V5+, Sr2+, W4+, W6+, CR2+, Cr3+Cd2+,

M2means is it metal, selected from the group comprising Fe2+, Fe3+, Co2+With3+, MP2+, MP3+, V4+, V5+, Cr2+, Cr3+Rh3+, EN2+Ir3+

and

M1and M2may be the same or different,

And means anion selected from the group comprising halide, hydroxide, sulfate, carbonate, cyanide, thiocyanate, isocyanate, cyanate, carboxylate, oxalate or nitrate,

X is an anion selected from the group comprising halide, hydroxide, sulfate, carbonate, cyanide, thiocyanate, isocyanate, cyanate, carboxylate, oxalate or nitrate,

L is mixed with water ligand selected from the group comprising alcohols, aldehydes, ketones, simple, ether, polyether, ester, urea, amides, NITRILES and sulfides,

and

a, b, C, d, g and n are selected in such a way that ensured electroneutrality connection, and

e denotes the coordination number of the ligand,

f fractional or integer greater than or equal to 0

h fractional or integer greater than or equal to 0.

Obtaining these compounds is well-known methods in which an aqueous solution of water-soluble metal salt combined with the aqueous solution of hexacyanometallate, in particular salt or acid and to this during or after the unification of the added water-soluble ligand.

Cyanides of metals due to the x high activity is ideally suited for the synthesis of polyether polyols according to the invention. The applied concentration of the catalysts is less than 1 wt.%, preferably less than 0.5 wt.%, especially preferably less than 1000 mils. dollars., in particular less than 500 mils. dollars., especially preferably less than 100 mil. dollars., in terms of the total weight of the obtained polyetherpolyols. Receipt of polyether polyols using cyanides of metals can be carried out both continuously and discontinuously. The synthesis can be carried out suspension way, nepodvizhnom layer, the sliding layer or in a suspended layer.

For the reaction conditions in respect of pressure and temperature there is no fundamental difference between catalysis with alkaline compounds and using the compounds based on cyanide metals. Join alkalisation is carried out at temperatures between 50° 200° s, and the temperature between 90° 150° are preferred. And at a pressure in the range from 0.001 bar and 100 bar, when attaching alkalisation with at least 3 carbon atoms in the molecule, preferably between about 0.001 bar and 20 bar, at the accession of ethylene oxide, preferably between 1 and 40 bar. Before dosing alkalisation reaction chamber is typically rinsed with an inert gas such as nitrogen.

After joining alkalisation usually follows polariation phase in order to achieve full conversion of alkalisation.

After you build the value obtained polyetherpolyols treated in the usual way, moreover, the unreacted accelerated and other volatile components are removed by means of steam and distilled, and, if necessary, remove mechanical impurities filtered from the raw polyetherpolyols.

If the last stage of the process was catalyzed by alkaline catalyst, the catalyst must be removed from polyetherpolyols. To do this, the alkaline catalyst is neutralized with acid and the resulting salt is removed by filtration from polyetherpolyols.

If the last stage of the method kataliziruemyj-based compounds cyanides of metals, the catalyst can remain in polyetherpolyols, but if necessary it can be removed, for example, by filtering.

The polyether polyols according to the invention is excellently suitable for the production of polyurethanes, in particular polyurethane soft foams. They are well tolerated by other components of polyurethanes, and, despite their relatively high content ethyleneoxide units, less hydrophilic. Due to the high reaction rate of polymerization of ethylene oxide in comparison with propylene oxide output per unit volume of time for polyether polyols according to the invention is higher than for conventional polyether polyols. Further increase of output per unit volume of time can be achieved when at least part of alkalinized is in joins in the presence of compounds based on cyanide metals as a catalyst.

The invention is illustrated below in the examples.

Examples 1 and 2

The accession of ethylene oxide to the substance initiation

Example 1

In a reactor with a capacity of 10 l serves 1115 g of glycerin and 32.5 g of 47%aqueous solution of potassium hydroxide. Water is removed at a temperature of from 95 to 100° in a vacuum of less than 1 mm RT. Art. for 1.5 hours. At 110° and when the nitrogen pressure 3.5 abs. bar. Add 3980 g of ethylene oxide for 6 hours. After what happened reactions create a vacuum of hydrogen and then to remove the catalyst serves 250 g of magnesium silicate, ambrosoli AmbosolŪ and 50 g of water and polyetherpolyols, then filtered and removed by distillation water.

The resulting polyetherpolyols this has the following: hydroxyl number: 394 mrgan/g, viscosity at 25° S: 240 MPa· C, potassium: 5 mils. dollars.

Example 2

The reaction of lead, as in example 1, but the reaction of the interaction is carried out with 612 g of glycerin, and 31.7 g of 47%aqueous solution of potassium hydroxide and 4356 g of ethylene oxide.

The resulting polyetherpolyols has the following characteristics: hydroxyl number: 219 mg KOH/g, viscosity at 25° S: 222 MPa· C, potassium: 3 mil. dollars.

Examples 3 and 4

Getting polyether polyols

The synthesis is carried out in a reactor with a stirrer with a capacity of 10 liters At 50° introducing the reaction products of examples 1 and 2. Three of evaluatie and subsequent napadenie nitrogen reactor inertizing. The outgassing produced by the 1, 5-hour evacuate at 105° and at a pressure of less than 1 abs. the mbar. Then served the catalyst on the basis of the double cyanide of metal, obtained by the interaction of zinc acetate with cobaltcontaining acid and tert.-butanol. After that, the reactor again three times evacuated and flushed with nitrogen. Then spend about half an hour, evacuate, raising the temperature to 125° and evacuate to a pressure of less than 1 abs. mbar. At this temperature serves a mixture of propylene oxide and ethylene oxide. After another 30 minutes at 125° received polyetherpolyols freed in vacuo from volatile components. To separate the catalyst, the reaction mixture was filtered over a double layer of filter deep filtration of Seitz (To 900).

The number of initial substances and characteristics of the obtained polyether polyols are shown in table 1.

The result is:

All polyether polyols have an internal block of glycerin and ethylene oxide. In example 3, in adjoin a mixed block of ethylene oxide and propylene oxide. Example 4 - a block of propylene oxide.

Get the polyether polyols which have only a small proportion of unsaturated components. According to the method according to the invention it is possible to obtain products with low hydroxyl number. The distribution of molecular weight polyether polyols in all the cases, very narrow.

Table 1
The number and the analyses of the obtained polyether polyols
ExampleThe polyester from exampleThe amount of polyester [g]The catalyst [g]The propylene oxide [g]The ethylene oxide [g]Hydroxyl number [mgKOH/g]The viscosity at 25° C [MPa*s]Cf. mole-Kul. weight [g]Mole-Kul. weight [g]Unsaturated components [mEq/g]
31609,72,141428810747,1722287730930,0066
421097,32,1423909-46,3725284930040,0058

Example 5 (comparative example) and 6

Obtaining foams

Are shown in table 2 components of polyols and isocyanates turn in comparative example b & e example 6 polyurethane soft foams. Component parts component polyols intensively mixed. Thereafter, under stirring was added the isocyanate and the reaction mixture is poured into an open form, where Espenau in polyurethane foam.

Properties of the polyurethane foam according to the invention are presented in table 2. Applicable standards tests are given in table 3.

Table 2
Preparation and properties of a block of soft foam
 Example 5 (EUR.)Example 6
The components of the polyolHydrocyclone number [mgKOH/g]Amount [g]Amount [g]
Polyol And481000 
The polyol of example 448 1000
Water62333838
BF 2370 1010
Amine catalyst N 2015601,91,9
Amine catalyst 206 N4260,60,6
Zinc catalyst To 2902,32,5

Continuation of table 2
  Example 5 (EUR.)Example 6
Amount 10531053,0
IsocyanateNCO [%1Amount [g]Amount [g]
TDI 80/2048,3488,0488,0
Index 110110
Test dataUnits  
Start time[with]1510
The cure time[with]9080
The rise time[with]9085
Lifting height[mm]275265
Lifting height after 5 minutes[mm]270260
Breathability[mm waters. Art.]1010
Bulk density[kg/m3]to 25.326,4
Stiffness in compression at 40%[kPa]the 4.74,1
Tensile strength tensile[kPa]79,188
Stretching[%]121146
The remainder strain compression at 50%[%]2,42,4

Polyol A: glycerine initiated polyetherpolyols with the inner block 30 weight. shares of propylene oxide and adjacent a mixture of 57 weight. shares of propylene oxide and 10 weight. shares of ethylene oxide.

Table 3
Norms test
Test methodNorm test
Bulk densityDIN 53420
Experience in tension (tensile strength)DIN 53571
The remainder strain compressionDIN 53572
The elastic reboundDIN 53573
Hardness indentationDIN 53576
Hardness compressionDIN 53577

1. The method of producing polyether polyols by splitting the cycle of polymerization of ethylene oxide and at least one accelerated having at least three carbon atoms in the molecule attached to the H-functional initiators in the presence of a catalyst, wherein the H-functional initiator attach a maximum of 40% in recalculation on weight of the obtained polyetherpolyols, ethylene oxide is whether a mixture of ethylene oxide and at least one accelerated having at least three carbon atoms in the molecule, containing at least 98%, calculated on the mixture of ethylene oxide in the presence of a catalyst, which is used as at least one primary connection, and then to the obtained polyetherpolyols attach at least one alkylenes having at least three carbon atoms in the molecule, or a mixture of ethylene oxide and at least one accelerated having at least three carbon atoms in the molecule, containing a maximum of 20%, calculated on the mixture of ethylene oxide, and the catalyst used, at least one connection based on the cyanides of metals.

2. The method of producing polyether polyols according to claim 1, characterized in that in addition to the end of the chain attach the ethylene oxide.

3. The method according to claim 2, characterized in that the accession of ethylene oxide by the end of the chain is carried out in the presence of at least one basic compound as a catalyst.



 

Same patents:

FIELD: polymerization catalysts.

SUBSTANCE: catalyst is composed of double metal cyanide compound, organic ligand, and two complexing components other than precedent organic ligand and selected from group including: polyethers and polyesters, glycidyl ethers, esters from carboxylic acids and polyatomic alcohols, bile acids, bile acid salts, bile acid esters, bile acid amides, and phosphorus compounds, provided that selected complexing components belong to different classes.

EFFECT: substantially increased catalytic activity.

5 cl, 1 tbl, 16 ex

FIELD: polymerization catalysts.

SUBSTANCE: invention provides double metal cyanide catalysts for production of polyetherpolyols via polyaddition of alkylene oxides to starting compounds containing active hydrogen atoms, which catalysts contain double metal cyanide compounds, organic complex ligands, and α,β-unsaturated carboxylic acid esters other than above-mentioned ligands.

EFFECT: considerably increased catalytic activity.

6 cl, 16 ex

FIELD: polymer production.

SUBSTANCE: polyoxyalkylene-polyols are obtained via direct polyoxyalkylenation of acid-sensitive low-molecular initiator with molecular weight below 400 Da in presence of double complex metal cyanide catalyst. Process comprises: (i) creation of appropriate conditions in reactor of polyoxyalkylenation in presence of double complex metal cyanide catalyst; (ii) continuously feeding into reactor alkylene oxide and above-mentioned initiator; and (iii) discharging polyether product. Loss of catalyst activity is reduced by performing at least one of the following operations: acidification of acid-sensitive low-molecular initiator before feeding it into reactor; and treatment of the same with effective amount of a substance other than acid, which reacts with base or absorbs base, before feeding it into reactor.

EFFECT: prevented catalyst from loosing its activity and essentially decreased high-molecular fraction and polydispersity of polyoxyalkylene-polyols.

21 cl, 2 dwg, 2 tbl, 3 ex

The invention relates to polyether polyols with the content of primary hydroxyl groups of from 40 to 95 mol.% and General content oxyethylene blocks more than 25 wt.%, which are obtained in the presence of CBM - catalyst poly(oksietilenom/oxypropylene) - terminal block

The invention relates to hydrophilic processing of films made from styrene resins, and the use of modifiers to improve, for example, antistatic properties and sliding properties (slipperiness) films

The invention relates to a method for carrying out gas-liquid reactions, which proceed with participation of the mechanism of dispersion gas to liquid and liquid to gas

The invention relates to a semi-continuous method and system for producing Preductal of alkalisation by carrying out the reactions of addition of accelerated on the initiator growth macromolecular chain, which has at least one active hydrogen atom
The invention relates to methods of producing polyether of polyglycols (oligomers of 1,2-oxirane) and can be used in chemical industry for production of surfactants, plasticizers, binders, complexing agents, etc

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: 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: 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

The invention relates to polyether polyols with the content of primary hydroxyl groups of from 40 to 95 mol.% and General content oxyethylene blocks more than 25 wt.%, which are obtained in the presence of CBM - catalyst poly(oksietilenom/oxypropylene) - terminal block

The invention relates to rigid polyurethane foams, which regulates the energy that demonstrate a high degree of regulation in energy, and a high degree of recovery form

The invention relates to the production of molded polyurethane materials, in particular foams, using significant amounts of polyol with a relatively high content of oxyethylene links, which are used as structural elements in different areas of technology and household appliances with good performance properties

The invention relates to dispersions of polyalkyleneglycol that can be used to obtain ultra-soft polyurethane foam

The invention relates to methods of producing polyurethane prepolymers, which are designed to produce coatings to protect metal, concrete, wood, glass surfaces from the effects of various atmospheric and corrosive environments, corrosion, static electricity, abrasive wear and can be used as a protective internal and external coating of pipes, vessels and tanks, engineering and hydraulic structures, power plants, port facilities, roofing and shingles, as well as decorative coatings

The invention relates to a new method of production of rigid polyurethane foam with a predominantly closed cell rigid polyurethane foams obtained by this method as a layer constituent elements and material for filling cavities

The invention relates to compositions based polyols, and also to a method for production of polyurethane foam using such compositions, which can be used for pipe insulation

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

Up!