CN1242384A - Polyisocyanate composition - Google Patents
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- CN1242384A CN1242384A CN 99108601 CN99108601A CN1242384A CN 1242384 A CN1242384 A CN 1242384A CN 99108601 CN99108601 CN 99108601 CN 99108601 A CN99108601 A CN 99108601A CN 1242384 A CN1242384 A CN 1242384A
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Abstract
Process for preparing a flexible foam by reacting an isocyanate prepolymer having a free NCO content of 2-15% by weight, an isocyanate prepolymer having a free content of 25-31% by weight and an isocyanate-reactive composition comprising water.
Description
The application is to be on April 16th, 1993 applying date, and application number is 93105735.3, and denomination of invention is divided an application for the application for a patent for invention of " method for preparing flexible polyurethane foam ".
The present invention relates to a kind of method for preparing flexible polyurethane foam, prepare the reaction system of these type of foams and be used to prepare the polyisocyantates composition of these type of foams.
The preparation of flexible polyurethane foam is widely known.
Described a kind of method in EP 392788, it uses a kind of isocyanate prepolymer and another kind of polyisocyanates that free NCO content is 2% to 15% (weight) that have.The preferred a kind of diphenylmethanediisocyanate of other polyisocyanates, as the MDI isomer mixture, MDI variant and thick or polymeric MDI.
People are surprised to find, and above-mentioned prepolymer uses with another kind of prepolymer, give improved processing characteristics and have reduced closed pore bubble number and foam defective.Even do not need to use tensio-active agent.Except those improvement that should consider, elasticity and hysteresis phenomenon have also been observed.
Therefore, the present invention relates to a kind of method for preparing flexible polyurethane foam, it is to have the isocyanate prepolymer that free NCO content is 2% to 15% (weight) (this prepolymer is that the polyoxyalkylene polylol of the ethylene oxide content of 30% (weight) makes by having at the most) and another kind and have the isocyanate prepolymer that free NCO content is 25-31% (weight) (this prepolymer is that the polyoxyalkylene polylol by the ethylene oxide content with at least 50% (weight) makes) by a kind of, and the weight ratio of first kind and second kind prepolymer is at 1.5-19: 1 scope, and react with the isocyanate-reactive composition that comprises at least 40% (weight) water and make.In this context, the prepolymer of isocyanate end is defined as the reaction product of excessive polyisocyanates and polyvalent alcohol, also comprises unreacted polyisocyanates and any polyisocyanates that adds after reaction.
Having free NCO content can obtain by following at the prepolymer of the isocyanate end of 2% to 15% (weight) scope: to have average functionality be 2 to 8 nominally allow, the number average equivalent is in 500 to 5000 scopes, and the polyoxyalkylene polylol and excessive polyisocyanates (particularly diphenylmethane diisocyanate compositions) reaction of stoichiometric quantity of 30% (weight) ethylene oxide content at the most.This prepolymer is at the following first kind of prepolymer ＂ of ＂ that be called.
Preparation during this first kind of prepolymer spendable diphenylmethane diisocyanate compositions comprise the pure ＂ MDI of ＂, preferably include contain at least 55% (weight) 4,4 '-isomer.Therefore, suitable isocyanic ester comprise pure haply 4,4 '-isomer and following isomer mixture, this mixture comprises and is no more than 40%, preferably is no more than 30%, more preferably no more than 20% (weight) 2,4 '-isomer and be no more than 5% (weight) 2,2 '-isomer.Other suitable diphenylmethane diisocyanate compositions comprises the form that is modified of these diphenylmethanediisocyanates, that is to say, comprise at least 60% (weight) 4,4 '-MDI of isomer, it is modified with known method by introducing ammonia ester, allophanate, urea, biuret, carbodiimide, uretonimine or cyanurate residue.What these so-called MDI variants comprised the uretonimine modification especially has NCO content for the MDI of at least 25% (weight) with have the prepolymer based on polyethers of NCO content at least 20% (weight).When first kind of prepolymer of preparation, also can use the diphenylmethane diisocyanate compositions that comprises pure MDI and polymer packing.The MDI composition that comprises polymer packing is existing in the prior art to be described, it be included among the MDI polyurea dispersions and based on MDI with contain the prepolymer that NCO content is at least the dispersive polymer beads polymer polyatomic alcohol of 20% (weight).In these products, general preferably have median size and be no more than 50 microns dispersive polymer beads.
Spendable diphenylmethanediisocyanate comprises that also those comprise the composition of poly methylene poly phenyl poly isocyanate when this prepolymer of preparation.Therefore, spendable mixture comprises pure MDI of at least 70% (weight) and the so-called thick MDI of 30% (weight) at the most, wherein thick MDI comprises 35% to 65% (weight) vulcabond, and remaining mainly is that isocyanate functionality surpasses 2 poly methylene poly phenyl poly isocyanate class.Also can use the mixture of pure MDI and polymeric MDI composition, this MDI composition comprises the polyisocyanates of the said high functionality of higher proportion (at the most 100%).
Preparation during first kind of prepolymer spendable diphenylmethane diisocyanate compositions also comprise above-mentioned MDI type and the mixture of 20% (weight) other polyisocyanates at the most further.Other can mix the polyisocyanates that uses with MDI and comprise: aliphatics, cyclic aliphatic and araliphatic polyisocyanates, especially vulcabond, for example: hexamethylene diisocyanate, isophorone two different acid esters, hexanaphthene-1.4-vulcabond, 4,4 '-dicyclohexyl methane diisocyanate, and and right-tetramethylxylene diisocyanate, especially aromatic polyisocyanate class, such as tolylene diisocyanate and phenylene diisocyanate and their mixture.
Yet, the preferred embodiment of the invention comprises the polyphenyl polyisocyanate class of as above disclosed methylene bridge, first kind of prepolymer also can be made by other polyisocyanates, such as, aliphatics particularly, cyclic aliphatic and araliphatic polyisocyanates, especially diisocyanates, hexamethylene diisocyanate for example, isophorone diisocyanate, hexanaphthene-1, the 4-vulcabond, 4,4 '-dicyclohexyl methane diisocyanate and and right-tetramethylxylene diisocyanate class, especially aromatic polyisocyanate class such as tolylene diisocyanate and phenylene diisocyanate class.
The preferred tolylene diisocyanate composition that is used for this embodiment of the present invention is so-called TDI 80/20 (2,4-tolylene diisocyanate and 2, the 6-tolylene diisocyanate was with 80: 20 mixture), TDI 65/35 (2,4-tolylene diisocyanate and 2, the 6-tolylene diisocyanate was with 65: 35 mixture), and the prepolymer of their high NCO content.
Nominally it is 2 to 8 that the polyvalent alcohol that uses when first kind of prepolymer of preparation has average hydroxy functionality.Nominally term ＂ functionality ＂ refers to for isocyanic ester, polyvalent alcohol can give the relevant functionality of the monomer component with it of phase, for example, by 1, to have hydroxy functionality be 2 nominally the 2-propylene oxide adds to polyethers that ethylene glycol makes, though in fact, its average functionality will be a little less than 2.
Therefore, for polyether glycol, nominally average functionality is a kind of initiator that uses in its preparation process or the average functionality (active hydrogen atom number) of multiple initiator.
Nominally the average sense of polyvalent alcohol preferably 2 to 4 is more preferably 2 to 3.The number average equivalent of employed polyvalent alcohol is in 750 to 5000 scope, preferably in 1000 to 4000 scope.The ethylene oxide content of employed polyvalent alcohol is 30% (weight) at the most, and this is according to the total weight of polyvalent alcohol.Can also use the mixture of two or more different on functionality, equivalent and/or chemical structure polyvalent alcohols, as long as these mixtures are observed the criterion of average functionality, average equivalent and the ethylene oxide content of regulation here.
Spendable polyoxyalkylene polylol comprises by epoxide, for example oxyethane, butylene oxide ring or tetrahydrofuran (THF), the product that obtains needing to carry out polymerization in the presence of the more function group initiator.Suitable initiator compounds comprises a plurality of reactive hydrogen atoms, and it comprises water and polyvalent alcohol, for example ethylene glycol, propylene glycol, Diethylene Glycol, cyclohexanedimethanol, Resorcinol, dihydroxyphenyl propane, glycerine, TriMethylolPropane(TMP), 1,2,6-second triol or tetramethylolmethane.Also can use the mixture of class of initiators and/or epoxides.
Useful especially polyether glycol comprises polyoxypropyleneglycol and triol, it be resemble description of the Prior Art by oxyethane and propylene oxide simultaneously or add to continuously in succession two or the trifunctional initiator on obtains, be that ethylene oxide content is no more than 30% (weight).Can use random copolymers, segmented copolymer and random/segmented copolymer with at least 30% (weight) ethylene oxide content (based on the gross weight of polyvalent alcohol).The mixture of this dibasic alcohol and trivalent alcohol is particularly useful.Other useful especially polyether glycol comprises the polytetramethylene glycol that is obtained by tetrahydrofuran by polymerization.Useful especially can also be poly(propylene oxide)-polyethylene oxide polyvalent alcohol and the mixture of 5% another kind of polyvalent alcohol at the most, for example, and the inferior hydrocarbon of polyoxygenated, polyester polyol, polycarbonate polyol, polyacetal polyvalent alcohol or polytetramethylene glycol.
Operable other polyvalent alcohol is included in the dispersion or the solution of addition in the above-mentioned type polyvalent alcohol or condensation polymer.The polyvalent alcohol of these modifications is fully described in the prior art, it comprises by one or more vinyl monomers, for example vinylbenzene and vinyl cyanide, polymerization in situ or by a kind of polyisocyanates and a kind of amino and/or hydroxy functional compound in polyether glycol, such as trolamine, situ reaction in a kind of polyol and the product that obtains.
React under the condition of the preparation prepolymer that the prepolymer of first kind of isocyanate end can fully be described in the prior art by polyisocyanates and polyol and prepare.40 ℃ to 90 ℃ temperature of reaction generally is fit to the preparation prepolymer.For making final NCO content in 2% to 15% (weight) scope, the primary rate of isocyanic ester and oh group generally should be 3: 1 to 20: 1 scope.Preferred prepolymer is made by following conditioned response by starting raw material: the primary rate of isocyanic ester and oh group was 3.5: 1 to 15: 1 scope, especially at 4: 1 to 10: 1, it is 4% to 12% that the prepolymer that obtains has free NCO content, especially is 5% to 10% (weight).Above-mentioned one or more isocyanic ester can be joined in the reaction product after the reaction.It is 2% to 15% (weight) that the amount of the polyisocyanates that is added should make prepolymer still have NCO content.
Except first kind of prepolymer, the method according to this invention has been used another kind of prepolymer.
Having the prepolymer that free NOO content is 25-31% (weight) (below be called second kind of prepolymer) is the poly methylene poly phenyl poly isocyanate of 2.5-3.0 and to have nominal hydroxy functionality be that 2-6 and number equivalent are that 250 to 300 polyoxyalkylene polylol makes by having isocyanate functionality.According to the calculating of whole polyols, polyol has ethylene oxide content should be at least 50%, preferred 60% to 90% (weight).Polyisocyanates and polyalcohols can be selected from above-mentioned those compounds that are used to prepare first kind of prepolymer, as long as polyisocyanates and polyalcohols are observed above-mentioned qualification.Second kind of prepolymer to be preparing with first kind of similar mode of prepolymer, sole exception be to be the prepolymer of 25-31% weight for obtaining to have free NCD content, NCD: the OH ratio wants high.After the reaction, can add above-mentioned one or more polyisocyanates, as long as NCO content remains on 25-31% (weight).
In order to prepare foams, the polyisocyantates composition of preferred 100 parts (weight) (wherein, comprise according to first kind of prepolymer of the 60-95% (weight) of the total weight of first kind and second kind prepolymer and second kind of prepolymer of 5-40% (weight)) with the isocyanate-reactive composition of 1-20 part (weight), under the common additives existence condition of necessity, react, this additive can be included in the isocyanate-reactive composition or easily in polyisocyanates (if additive is an inert to isocyanic ester), or as a kind of extra streams.
In many cases, water becomes the unique isocyanate-reactive part that is present in the isocyanate reaction active composition.Except comprising water, the isocyanate-reactive composition also can comprise other isocyanate activity compound of 60% (weight) at the most, and particularly those have average equivalent and are lower than 500 compound.Preferred isocyanate-reactive composition comprises the water of at least 50% (weight), applies for then at least 95% (weight) for some.In addition, this isocyanate-reactive composition can comprise the polyol of a spot of a kind of higher molecular weight.
Having average equivalent, to be lower than 500 suitable isocyanate activity compound be the active aliphatics of many functional group isocyanates, cyclic aliphatic, aromatic series or araliphatic compounds or their mixture, as ethylene glycol, propylene glycol, dipropylene glycol, 1, the 4-butyleneglycol, Sorbitol Powder, monoethanolamine, diethanolamine, 1, molecular weight are lower than 1000 amine-terminated polyether class, isophorone diamine (1-amino-3-amino-3,5, the 5-trimethyl-cyclohexane), whole hydrogenant two (aminophenyl) methane, send piperazine, the hydrogenant methylene dianiline (MDA), diamino methane and hydrogenant tolylene diamine, the strange derivative of the Manny of diethyl toluene diamine and phenols or induced by alkyl hydroxybenzene, particularly strange condenses of the Manny of benzene alcohol or phenol derivatives, formaldehyde and diethanolamine, as 2, two (N, N-the diethanolamine)-4-nonylphenols of 5-.
Operable additive comprises common in the literature disclosed catalyzer, for example: tertiary amines and tin compound class; Surfactant-based and suds-stabilizing agent class, for example siloxanes-oxyalkylene copolymers class; The fire retardant class; Organic and mineral filler class, pigment class and inner pattern releasing agent applicable class.Preferable methods is carried out in the presence of the Chlorofluorocarbons (CFCs) whipping agent (as three oxygen fluoromethane) not having according to the present invention.
The reaction of flexible foam produced according to the present invention generally is to be 35 to 125 at index, is preferably to carry out in 45 to 105 o'clock; This index can be defined by following formula:
The equivalents of the equivalents of index=NCO * 100/ isocyanate reactive group
The invention further relates to isocyanate composition; It comprises that the free NCO content of having of 60-95% (weight) is that a kind of isocyanate prepolymer (wherein this polymers is to make for the polyoxyalkylene polylol of 30% (weight) at the most by having ethylene oxide content) and the another kind of 5-40% (weight) of 2% to 15% (weight) has the isocyanate prepolymer that free NCO content is 25-31% (weight) (wherein this prepolymer is to be made by the polyoxyalkylene polylol with ethylene oxide content at least 50% (weight)), and the % (weight) of the first and the second prepolymer is according to the total weight of the first and the second prepolymer.
As everyone knows, polyisocyanates, the prepolymer class of isocyanate end and the manufacturers of polyalcohols usually do not make foams, and they sell above-mentioned chemical substance and give foam manufacturers.Usually the reaction system of a complete formula design is sold to foam manufacturers; Promptly comprise all other compositions, polyisocyantates composition and polyol composition as whipping agent, catalyzer etc. are sold as a reaction system in container separately, so that the user makes specific foams by making two kinds of composition reacts.This means provide simple relatively approach for the user, mix by making two kinds of compositions under proper condition, are manufactured a product by different chemical substances.The weak point of this means is that foam manufacturers is restricted when making this reaction system be adapted to that he is specific to need.Therefore, think that in the context of the present invention saving grace is not provide a kind of mixture of first kind and second kind prepolymer, and provide first kind in the reaction system that comprises the isocyanate-reactive composition and second kind of prepolymer separately.Therefore, the present invention relates to a kind of reaction system, it comprise (A) have the isocyanate prepolymer that free NCO content is 2% to 15% (weight) (wherein prepolymer is to make for the polyoxyalkylene polylol of 30% (weight) at the most by having ethylene oxide content) and (B) another kind have the isocyanate prepolymer that free NCO content is 25% to 31% (weight) (wherein prepolymer be that the poly suboxygen polylol of at least 50% (weight) make by having ethylene oxide content), the weight ratio of first kind and second kind prepolymer is at 1.5-19: 1 scope and (C) a kind of isocyanate-reactive composition that comprises at least 40% (weight) water.Preferred reaction system comprises that 60-95% (weight) is with first kind of prepolymer, second kind of prepolymer of 5-40% (weight), the isocyanate-reactive composition (with respect to first kind and second kind of prepolymer of 100 weight parts) of (this be according to the total weight of first kind and second kind prepolymer) and 1-20 weight part.
Term ＂ reaction system ＂ is defined as the various mixture of ingredients of flexible foam produced according to the present invention, and wherein each composition is stored in separately the container, and various composition is sold and purchase is used to prepare described flexible foam.Thereby composition (A) (B) He (C) is kept in the above-mentioned reaction system separately.
Thisly have separately that the reaction system of prepolymer provides a kind of like this chance for foam manufacturers, (system) supplies to prepolymer separately in the isocyanate-reactive composition independent of one another.Therefore, the method according to this invention.An embodiment preferred is that (system) contacts first and second prepolymers separately independent of one another with the isocyanate-reactive composition.In general, it is by providing following a kind of transmitting device (as pipe) to carry out, it be from the container that comprises first kind of prepolymer to mixing head or a cover make the reaction zone of device of foams a kind of transmitting device and from the container that comprises second kind of prepolymer to second kind of transmitting device described mixing head or the reaction zone and from the container that comprises the isocyanate-reactive composition to the third transmitting device described mixing head or the reaction zone.The key character of the present embodiment be from separately independently container two kinds of prepolymers are provided, allow foam manufacturers have an opportunity to regulate their relative consumption.In this embodiment, two transmitting devices are just combined before reaction zone or mixing head or at reaction zone or mixing head place with an independent transmitting device.Equally in this embodiment, provide from separately independently container to first and second transmitting device the mixing zone, wherein two kinds of prepolymers are mixed in the mixing zone, a kind of transmitting device from this mixing zone to described reaction zone or mixing head also is provided simultaneously, is wherein induced one to contact with the isocyanate-reactive composition at two kinds of prepolymers of reaction zone or mixing head place.
For those person skilled in the art be clear that isocyanate-reactive reagent and/aforementioned other polyisocyanates can offer reaction zone or mixing head through not only transmitting device.For some application, this mode can particularly preferably be used to prepare block flexible foam.
When enforcement is of the present invention, the optimum homogeneous liquid mixture that before prepolymer and isocyanate-reactive composition react, forms prepolymer.
The homogeneous liquid mixture is that the speed metering by control joins the prepolymer of specified quantitative in the mixing zone, reaches the needed weight ratio of prepolymer and makes.Preferred this mixing zone comprises the mixing of high-shear or impacts and mix.Each prepolymer be by use suitable liquid meter charge pump from basin with independent streamed being added in the mixing zone of metering liquid.If desired, basin and pump system can be heated so that prepolymer enters in the mixing zone under desirable viscosity and temperature, and after the mixing, they are added in the reaction zone, form needed foams with the isocyanate-reactive composition react.
The mixing zone that is suitable for can be a kind of container with suitable shape of high shear mixing.The container that should be suitable for can be a kind of right cylinder with a plurality of inlets of sealing, and wherein these inlets are preferably diametrically opposed, and the high shear mixing blade except rotation therein uses the mixing force like this, also shows and impacts the blended advantage.
High shear mixing power is normally provided by the hybrid blade with the suitable shape of high speed rotating that is positioned at the center, mixing zone.
Except isocyanic ester, other additive such as catalyzer, tensio-active agent, tinting material, stablizers etc. can be introduced in the mixing zone.
After one section finite time mixing formation homogeneous mixture, but the isocyanate mixture temporary storage is transferred in the reaction zone in storage area or immediately.
Reaction zone can be the adjacent part of mixing vessel or container independently.A kind of preferred mixing device comprises a long cylindrical vessel, along the high shear mixing blade is installed on the turning axle of cylinder length direction.The diameter of cylindrical mixing device and length on size design should with desired feed rate, the residence time and livering time are complementary.A plurality of charging openings are positioned at a termination of this container and receive unmixing isocyanic ester and other additive, and discharge port is positioned at the opposite end of container, discharges mixture.
Can use method of the present invention to prepare die casting foams and slabstock foam continuously, semi-continuously and off and on.
The present invention illustrates by following examples, but is not limited to these embodiment, and wherein umber and percentage ratio remove other and explains, generally by weight.
The following abbreviation of various raw materials is used to the identification component, and no longer indicates in an embodiment.
Abbreviation prepolymer 1
Have functionality and be 3, ethylene oxide content be about 14% (weight) (tip) and molecular weight be about 4500 polyol and have 2,4 '-content of isomer is the reaction product of the pure MDI of 10% (weight), it is 6.5% (weight) that this prepolymer has NCO content.
Polymeric MDI
Have NCO content and be 30.7 and functionality be 2.7 and the polymeric MDI of diisocyanate content 42% (weight).
Prepolymer 2a
It is about 4000 that above-mentioned polymkeric substance MDI and 4% (weight) have molecular weight, functionality be 3 and ethylene oxide content be the reaction product of the polyol of 75% (weight), ethylene oxide unit is to distribute arbitrarily.NCO content is 29.4% (weight).
Prepolymer 2b
Except using 6% (weight) polyol, other is with prepolymer 2a.NCO content is 28.7% (weight).
Prepolymer 2c
Except using 10% (weight) polyol, other is with prepolymer 2a.NCO content is 27.4% (weight).
Polyol
Have molecular weight and be about 4000, functionality be 3 and ethylene oxide content be the polyol of 75% (weight), ethylene oxide unit is to announce arbitrarily.Niax AI is available from the catalyzer of Union Carbide Corp.SH 210 is available from the Silicon surfactant of Union Carbide Corp.D33LV is available from the catalyzer DMI 1,2 dimethylimidazole of Air Products
Embodiment
The composition that table 1 is given mixed flexible foam.The physicals of the foams that obtained also provides in table 1.
Table 1 test number (TN) 123456 prepolymers 1 80 80 80 80 86.66 86.66 polymeric MDIs 20---13.44-prepolymer 2a-20---13.44 prepolymer 2b--20--prepolymer 2c---20--polyol----0.5-H2O 4.6 4.6 4.6 4.6 3.32 3.32Niax AI 0.2 0.2 0.2 0.2--SH 210----0.4-D33 LV 0.4 0.4 0.4 0.4--NMI/H
2O 80/20----0.6 0.6 index 52 51 50 49 60 60 free rising density kg/m
324 25 25 26 36 35 open/the most closed pore closed pores of closed pore degree ± perforate perforate perforate perforate
Shrink easy broken rebound resilience %----51 54
Foams according to experiment 6 of the present invention do not show surface imperfection, although do not use tensio-active agent; But, show some surface imperfection according to the foams of experiment 5 (embodiment as a comparison), although adopted tensio-active agent.
In experiment 1-4, foams are by at first allowing polyisocyanates be mixed with each other, and allow water and catalyst mix, and then allow these two kinds of mixtures mix in a unlimited container, react.
In experiment 5 and 6, employed various composition is (to comprise basin separately according to the equipment that ratio listed in the table 1 can be purchased from the market, each is canned is furnished with a volume pump and preheater) in take out and join in the mixing device, this mixing device is to be made by Viking PTILtd, and model TC 1167.Its internal diameter of cylindrical mixing head of the length that is adopted is 10cm, and length is 50cm, feels at ease therein and puts the turning axle with the outer shear-mixed blade of 62 0.8cm, and blade is to settle along the length direction of the 40cm axle 2cm of being separated by.Inlet is positioned at the 2cm place, top of mixing end apart from container.Additive is to be added into the mixing zone by the charging opening that is arranged in prepolymer and isocyanic ester charging opening below 13cm.The paste outlet of 5cm inside dimension is the centre that is positioned at the right cylinder bottom.The water charging opening is positioned at the place of isocyanic ester charging opening below 15cm on the sidewall.When operation, rotary shaft rotating speed is 3000RPM, the total feed that various compositions enter mixing device was 100-150kg/ minute scope, be adjusted in that residence time in the isocyanic ester mixing zone is 400 to 269 microseconds before the formation district that enters paste mixture, the residence time that wherein forms the district is 1.5 to 0.8 seconds.Paste mixture is to join one from mixing device to become cream and/or foaming district, to produce flexible block foam.
Claims (5)
1, polyisocyantates composition, the another kind with the isocyanate prepolymer that free NCO content is 2-15% (weight) (this prepolymer is to make by having the polyoxyalkylene polylol that ethylene oxide content is at most 30% (weight)) and 5-40% (weight) that it comprises 60-95% (weight) has the isocyanate prepolymer that NCO content is 25-31% (weight) (this prepolymer is to make by having the polyoxyalkylene polylol that ethylene oxide content is at least 50% (weight)), and wherein the % of first kind and second kind prepolymer (weight) is according to the total weight of first kind and second kind prepolymer.
2,, it is characterized in that second kind of prepolymer is is the poly methylene poly phenyl poly isocyanate of 2.5-3.0 and to have average nominal hydroxy functionality be that 2-6 and number average equivalent are 250 to 3000 polyoxyalkylene polylol system by having isocyanate functionality according to the polyisocyantates composition of claim 1.
3, a kind of reaction system, it comprise (A) a kind of have the isocyanate prepolymer that free NCO content is 2% to 15% (weight) (this prepolymer is to make by having the polyoxyalkylene polylol that ethylene oxide content is at most 30% (weight)) and (B) another kind have the isocyanate prepolymer that free NCO content is 25-31% (weight) (this prepolymer is to make by having the poly suboxygen polylol that ethylene oxide content is at least 50% (weight)), the weight ratio of first kind and second kind prepolymer is at 1.5-19: 1 scope and (C) a kind of isocyanate-reactive composition that comprises at least 40% (weight) water.
4, according to the reaction system of claim 3, it is characterized in that this reaction system comprises first kind of prepolymer of 60-95% (weight), the isocyanate-reactive composition (with respect to first kind and second kind of prepolymer of 100 parts (weight)) of second kind of prepolymer of 5-40% (weight) (this be according to the total weight of first kind and second kind prepolymer) and 1-20 part (weight).
5,, be the poly methylene poly phenyl poly isocyanate of 2.5-3.0 and to have average hydroxy functionality be that 2-6 and number average equivalent are that 250 to 3000 poly suboxygen polylol makes by having isocyanate functionality nominally it is characterized in that second kind of prepolymer according to the reaction system of claim 3 or 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99108601 CN1242384A (en) | 1992-04-16 | 1999-06-10 | Polyisocyanate composition |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9208377.3 | 1992-04-16 | ||
| CN 99108601 CN1242384A (en) | 1992-04-16 | 1999-06-10 | Polyisocyanate composition |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN93105735A Division CN1051777C (en) | 1992-04-16 | 1993-04-16 | Process for preparing flexible polyurethane same |
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| Publication Number | Publication Date |
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| CN1242384A true CN1242384A (en) | 2000-01-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 99108601 Pending CN1242384A (en) | 1992-04-16 | 1999-06-10 | Polyisocyanate composition |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106810668A (en) * | 2016-12-30 | 2017-06-09 | 浙江华峰新材料股份有限公司 | Polyurethane shoe-sole resin and preparation method and application |
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1999
- 1999-06-10 CN CN 99108601 patent/CN1242384A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106810668A (en) * | 2016-12-30 | 2017-06-09 | 浙江华峰新材料股份有限公司 | Polyurethane shoe-sole resin and preparation method and application |
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