CN110591052A - Low-odor isocyanate mixture, preparation method and application - Google Patents
Low-odor isocyanate mixture, preparation method and application Download PDFInfo
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- C—CHEMISTRY; METALLURGY
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/30—Low-molecular-weight compounds
- C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
- C08G18/3203—Polyhydroxy compounds
- C08G18/3206—Polyhydroxy compounds aliphatic
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
- C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
- C08G18/6666—Compounds of group C08G18/48 or C08G18/52
- C08G18/667—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38
- C08G18/6674—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/3203
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
- C08G18/76—Polyisocyanates or polyisothiocyanates cyclic aromatic
- C08G18/7607—Compounds of C08G18/7614 and of C08G18/7657
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
- C08G18/76—Polyisocyanates or polyisothiocyanates cyclic aromatic
- C08G18/7614—Polyisocyanates or polyisothiocyanates cyclic aromatic containing only one aromatic ring
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
- C08G18/76—Polyisocyanates or polyisothiocyanates cyclic aromatic
- C08G18/7657—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings
- C08G18/7664—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups
- C08G18/7671—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups containing only one alkylene bisphenyl group
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2101/00—Manufacture of cellular products
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- Organic Chemistry (AREA)
- Polyurethanes Or Polyureas (AREA)
Abstract
The invention discloses a low-odor isocyanate mixture, a preparation method and application thereof. The automobile molding foam prepared from the isocyanate mixture can be used for automobile seats, and the odor obtained by an odor test is below 2.5, so that the requirements of low odor and low VOC in a VDA270 odor test standard are met. No harm to human health, environmental protection and safety.
Description
Technical Field
The invention relates to an isocyanate mixture, in particular to a low-odor isocyanate mixture, a preparation method and application thereof. Belongs to the technical field of polyurethane foam.
Background
In recent years, the requirement of the national environmental protection department on the VOC of the whole vehicle is higher and higher, no specific execution standard for the vehicle exists before 2010, 2011 the national environmental protection department and the national quality control bureau jointly issue guidance for evaluating the air quality in the passenger vehicle, and 2016 the environmental protection department issues guidance for evaluating the air quality in the passenger vehicle (a survey).
Automotive VOCs are volatile organic compounds emitted by automobiles. According to the definition of world health organization, the compound with boiling point of 50-250 deg.C, the saturated vapor pressure at room temperature is over 133.32Pa, and the compound exists in the air in the form of vapor at room temperature. VOC is an important reason for influencing the quality of air in a vehicle, mainly comprises substances such as alkane, olefin, aromatic hydrocarbon, aldehydes or ketones, has special pungent smell, harms endocrine and digestive systems of a human body, causes slight paralysis of central nerves, and is partially classified as carcinogenic substances.
Chinese patent CN20171080642.4 mentions a low-aldehyde-content polyurethane plate which is composed of a component A and a component B, wherein the component A is a white material, and the component B is a black material; the polyol in component A comprises a polyurea polyol having a formaldehyde content of 20. mu.g/m3Acetaldehyde content of 9. mu.g/m3Although the content of aldehydes is slightly reduced, the harm of harmful substances to human bodies is still avoided, and the pungent odor cannot be completely removed.
Chinese patent CN201510319850.2 mentions a method of reducing VOC by introducing high functionality, high molecular weight polyether polyols to reduce the density of the foam. However, the formulation disclosed in this patent still contains a high content of small molecule cross-linking agents, so that the final product still cannot avoid the generation of irritating odor.
Most of the research is focused on the treatment of polyether, catalyst and silicone oil, and the use problem of the cross-linking agent is rarely involved. Actually, the cross-linking agent in the polyurethane flexible foam can greatly improve the hardness of the seat and reduce the density of the seat, and is an essential component in the formula of the seat, but the cross-linking agent has a strong pungent smell and contains substances harmful to human bodies, such as aldehydes and the like, and has negative effects on the health of end users and workers in production fields.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a low-odor isocyanate mixture, a preparation method and application.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method of a low-odor isocyanate mixture comprises the steps of heating and stirring a component A and a component B for reaction to obtain the low-odor isocyanate mixture; wherein, the component A is a substance containing active hydrogen, and the component B contains isocyanic acid radical.
Preferably, the component A contains an alcohol mixture C.
Further preferably, the alcohol mixture C contains a small molecule alcohol E, or a polyol F, or a mixture of both.
Still further preferably, the small molecule alcohol E in the alcohol mixture C has 2 to 6 carbon atoms and an average functionality of 2 to 6, including, but not limited to, Ethylene Glycol (EG), Propylene Glycol (PG), diethylene glycol (DEG), dipropylene glycol (DPG), 1, 3-butanediol, 1, 4-Butanediol (BDO), 1, 2-pentanediol, 1, 5-pentanediol, isoprene glycol, neopentyl glycol (NPG), Hexanediol (HDO), glycerol, Trimethylolpropane (TMP), pentaerythritol, sorbitol, or mixtures thereof, and even more preferably has 2 to 5 carbon atoms and an average functionality of 2 to 3, including Ethylene Glycol (EG), Propylene Glycol (PG), diethylene glycol (DEG), dipropylene glycol (DPG), 1, 3-butanediol, 1, 4-Butanediol (BDO), neopentyl glycol (NPG), Glycerol, Trimethylolpropane (TMP), or a mixture thereof.
It is further preferred that the small molecule alcohol E has a relative molecular mass of from 30 to 300g/mol, more preferably from 60 to 300g/mol, and particularly preferably from 90 to 250 g/mol.
More preferably, the relative molecular mass of the polyol F in the alcohol mixture C is 150-2000g/mol, more preferably 200-1000g/mol, and particularly preferably 250-500 g/mol; the functionality is from 2 to 6, more preferably from 2 to 4, and particularly preferably from 2 to 3.
More preferably, the polyol F is a polyether polyol, more preferably a polyethylene oxide polyol, a polypropylene oxide polyol, a polybutylene oxide polyol, a polytetrahydrofuran polyol or mixtures thereof.
Still further preferably, the polyol F is a polyester polyol, preferably but not limited to a conventional polyester polyol, a polycaprolactone polyol, a polycarbonate diol, a phthalic anhydride polyester polyol or a mixture thereof.
Still further preferably, the polyol F may be prepared by known procedures, such as by reacting an olefin oxide with a starter in the presence of a catalyst; the catalyst comprises one or more of but not limited to alkali hydroxide, alkali alkoxide, antimony pentachloride, boron fluoride diethyl ether and dimethyl carbonate; the olefin oxide includes, but is not limited to, one or more of tetrahydrofuran, ethylene oxide, 1, 2-propylene oxide, 1, 2-butylene oxide, 2, 3-butylene oxide and styrene oxide; the initiator includes, but is not limited to, one or more of water, ethylene glycol, diethanol, propylene glycol, dipropanol, glycerol, trimethylolpropane, diethanolamine, triethanolamine.
Preferably, the component A can also contain an amine substance D.
More preferably, the amine in the amine substance D has a relative molecular mass of 30-1000g/mol, still more preferably 60-500g/mol, and particularly preferably 105-150 g/mol. The amine is selected from, but not limited to, Diethylenetriamine (DETA), Triethylenediamine (TEDA), Diethanolamine (DEOA), Triethanolamine (TEOA), Dimethylethanolamine (DMEA), Trimethylamine (TMA), Triethylamine (TEA), Toluenediamine (TDA), N-dimethylcyclohexylamine, N-dimethylbenzylamine, N' -dimethylpyridine, Mannich base, or a mixture thereof.
The amine substance D further preferably contains an amine reactive with isocyanate, the amine being selected from, but not limited to, Diethylenetriamine (DETA), Diethanolamine (DEOA), Triethanolamine (TEOA), Dimethylethanolamine (DMEA), Toluenediamine (TDA), or mixtures thereof, and further preferably Diethanolamine (DEOA), Triethanolamine (TEOA), or mixtures thereof.
Preferably, the B component comprises one or more organic polyisocyanates; the polyisocyanates are represented by the general formula R (nco) n, wherein R represents an aliphatic hydrocarbon group having 2 to 18 carbon atoms, an aromatic hydrocarbon group having 6 to 15 carbon atoms or an araliphatic hydrocarbon group having 8 to 15 carbon atoms, and n is 2 to 4. Among them, the NCO% content of the isocyanate group contained in the B component is more preferably 20 to 60%, particularly preferably 30 to 50%.
Further preferred, the polyisocyanates include, but are not limited to, vinyl diisocyanate, tetramethylene 1, 4-diisocyanate, Hexamethylene Diisocyanate (HDI), dodecyl 1, 2-diisocyanate, cyclobutane 1, 3-diisocyanate, cyclohexane-1, 4-diisocyanate, 1-isocyanato-3, 3, 5-trimethyl-5-isocyanatomethylcyclohexane, hexahydrotoluene-2, 4-diisocyanate, hexahydrophenyl-1, 3-diisocyanate, hexahydrophenyl-1, 4-diisocyanate, perhydro-diphenylmethane 2, 4-diisocyanate, perhydro-diphenylmethane 4, 4-diisocyanate, phenylene 1, 3-diisocyanate, phenylene 1, 4-diisocyanate, durene 1, 4-diisocyanate, stilbene 1, 4-diisocyanate, 3-dimethyl 4, 4-diphenyldiisocyanate, toluene 2, 4-diisocyanate (TDI), toluene 2, 6-diisocyanate (TDI), diphenylmethane 2, 4 ' -diisocyanate (MDI), diphenylmethane 2, 2 ' -diisocyanate (MDI), diphenylmethane 4, 4 ' -diisocyanate (MDI), naphthylene 1, 5-diisocyanate (NDI), their isomers, mixtures between them and their isomers.
More preferably, the polyisocyanate is a modified isocyanate obtained by using a carbonized diamine, allophanate, or modification, and still more preferably diphenylmethane diisocyanate, a carbonized diamine-modified diphenylmethane diisocyanate, isomers thereof, or a mixture thereof with isomers thereof.
Further preferably, the polyisocyanate is an isocyanate prepolymer obtained by reacting a polyol polymer, such as a polyether polyol or a polyester polyol, with an excess of diisocyanate to form an oligomer having isocyanate groups as terminal groups, which is known as a polyurethane prepolymer in the polyurethane industry and is prepared by a method well known in the art (handbook for polyurethane materials 2002, 8.8, first edition, second volume, page 177-178, chemical industry press, Beijing, Capelin, Shuxiqin, eds.).
Still more preferably, the polyisocyanate is TDI, MDI and mixtures thereof and mixtures of prepolymers thereof, the TDI content being greater than or equal to 20% by weight.
Preferably, the amount of the component A is 0.1-30%, more preferably 1-20%, and particularly preferably 1-6% by weight of the whole system; the isocyanate adduct finally obtained by reacting the A component with the B component has an NCO content of 10 to 50%, preferably 25 to 45%, particularly preferably 32 to 42%.
Preferably, the process conditions of the heating stirring reaction are as follows: stirring and reacting for 1-5 hours at 40-80 ℃. The preparation method comprises the following specific steps:
the method comprises the following steps: heating the component A at the temperature of 100-130 ℃ for dehydration for 0.5-1.5 hours to ensure that the moisture content is less than 300ppm, and then cooling to 40-60 ℃;
step two: and (3) putting the product obtained in the step one and the component B into a reaction kettle, and stirring at 40-80 ℃ for 1-5 hours to obtain a product. Further preferably, the product obtained in step two may be further passed through a Thin Film Evaporator (TFE).
A low-odor isocyanate mixture is obtained by the above-mentioned preparation process.
Use of a low-odor isocyanate mixture as described above in molding foams for automobiles.
Preferably, the specific method is as follows: in parts by weight, the
10-50 parts of polymer polyether, namely,
50-90 parts of high-activity polyether,
0.3 to 5 portions of water,
0.1 to 3 portions of low-odor catalyst,
0.1 to 6 portions of low volatile silicone oil,
3.0 to 4.0 portions of foaming agent,
and (3) fully stirring and uniformly mixing the mixture with the isocyanate mixture, injecting the mixture into a mold at 60 ℃, curing for 10min, and opening the mold to obtain the molding foam for the automobile.
Further preferably, the polymer polyether is FA 3630, the high-activity polyether is KE 810, the low-odor catalyst is ZF-10 and NE-1070 which are mixed according to the mass ratio of 3: 1, and the low-volatile silicone oil is B-8715 LF.
The invention has the beneficial effects that:
the invention utilizes the heating and stirring reaction of the component A and the component B to obtain an isocyanate mixture; wherein, the component A is a substance containing active hydrogen, and the component B contains isocyanic acid radical.
According to the invention, the micromolecule cross-linking agent in the white material formula of the conventional polyurethane soft foam is replaced by a similar nontoxic low-formaldehyde product, and is polymerized with isocyanate in advance to further reduce harmful substances generated in the reaction, so that the harmfulness in the white material preparation process is greatly reduced on the premise of ensuring that the final physical properties are not changed.
The invention can further reduce the odor of the isocyanate prepared by the production by using a vacuum separation system.
The invention has almost no influence on the field process, and has extremely high compatibility with the existing products and processes.
The automobile molding foam prepared from the isocyanate mixture can be used for automobile seats, and the odor obtained by an odor test is below 2.5, so that the requirements of low odor and low VOC in a VDA270 odor test standard are met. No harm to human health, environmental protection and safety.
Detailed Description
The present invention will be further illustrated by the following examples, which are intended to be merely illustrative and not limitative.
Example 1:
100g of the mixture of TDI and MDI (TDI/MMDI/PMDI wt%: 50: 10: 40) were placed in a reaction vessel and stirred at 60 ℃ for 3 hours at 3000r/min to give an isocyanate mixture.
Example 2:
the method comprises the following steps: the glycerol/diethylene glycol mixture (mixing ratio 9: 1) was dehydrated for 1 hour at 100 ℃ and 130 ℃ and then cooled to 25 ℃.
Step two: 94g of the product obtained in step one and a mixture of TDI and MDI (TDI/MMDI/PMDI wt 50: 10: 40) were placed in a reaction vessel and stirred at 40 ℃ for 3 hours at 3000r/min to obtain an isocyanate mixture.
Example 3:
the method comprises the following steps: the glycerol-initiated polyether (OHV 1100NJ 301)/diethylene glycol mixture (9: 1 by mass) was dehydrated to 250ppm or less at 100 ℃ and 130 ℃ and then cooled to 25 ℃.
Step two: 99g of the product obtained in step one, mixed with TDI and MDI (TDI/MMDI/PMDI wt%: 50: 10: 40), are introduced into a reaction vessel and stirred at 60 ℃ for 3 hours at 3000r/min to give an isocyanate mixture.
Example 4:
the method comprises the following steps: the glycerol-initiated polyether (OHV 1100NJ 301)/diethylene glycol mixture (9: 1) component was dehydrated to below 250ppm at 100 ℃ and 130 ℃ and then cooled to 25 ℃.
Step two: 94g of the product obtained in step one, together with 6g of a mixture of TDI and MDI (TDI/MMDI/PMDI wt%: 50: 10: 40), were placed in a reaction vessel and stirred at 40 ℃ for 3 hours at 3000r/min to give an isocyanate mixture.
Example 5:
the method comprises the following steps: the trimethylolpropane-initiated polyether (OHV 600)/diethylene glycol mixture (9: 1) component was dehydrated to below 250ppm at 100 ℃ and 130 ℃ and then cooled to 25 ℃.
Step two: adding 3g of the product obtained in the first step and 22g of a mixture of TDI and MDI (TDI/MMDI/PMDI wt%: 50: 10: 40) into a reaction kettle, stirring at 60 ℃, rotating at 3000r/min for 1 hour
Step three: 25g of the above reaction mass were mixed homogeneously with 75g of a mixture of TDI and MDI (TDI/MMDI/PMDI wt%; 50: 10: 40) to give the product an isocyanate mixture.
Example 6:
the method comprises the following steps: the trimethylolpropane starting polyether (OHV 600)/DEOA/diethylene glycol mixture (mixing ratio 8: 1) component was dehydrated to below 250ppm at 100 ℃ and 130 ℃ and then cooled to 25 ℃.
Step two: 3g of the product obtained in the step one and 22g of TDI are put into a reaction kettle and stirred at the temperature of 60 ℃ at the rotating speed of 3000r/min for 1 hour
Step three: passing the obtained product through a molecular distillation apparatus or a thin film evaporator (separation temperature 140 deg.C, flow rate 500mL/h, vacuum degree 10)-2mbar)
Step three: 15g of the above reaction mass was mixed homogeneously with 85g of a mixture of TDI and MDI (TDI/MMDI/PMDI wt%; 50: 10: 40) to give the product an isocyanate mixture.
Example 7:
the polymer polyether FA 363050 g, the high-activity polyether KE 81050 g, the low-odor catalyst (ZF-10: NE-1070 ═ 3: 1 (mass ratio)) 1.1g, the low-volatile silicone oil (B-8715LF)2g and the deionized water 3g are mixed at normal temperature to obtain the low-odor premix.
Example 8:
mixing polymer polyether FA 363050 g, high-activity polyether KE 81050 g, diethanolamine 0.6g, low-odor catalyst (ZF-10: NE-1070: 3: 1 (mass ratio)) 1g, low-volatility silicone oil (L-3627)2g and deionized water 3g at normal temperature to obtain a common premix.
Test examples
According to the table 1, the isocyanate mixture obtained in the examples 1 to 6 is respectively fully stirred and uniformly mixed with the premix obtained in the reference example 7 or 8, then the mixture is injected into a mold with the temperature of 60 ℃, the mixture is cured for 10min, the mold is opened, the molding foam for the automobile is obtained, and the mass ratio of the isocyanate mixture to the premix is indicated in parentheses.
TABLE 1 raw material composition of molded foam for automobile
| Example 7 | Example 8 | |
| Example 1 | 0(100∶41.5) | |
| Example 2 | 1(100∶42) | 2(100∶44) |
| Example 3 | 3(100∶42) | 4(100∶45) |
| Example 4 | 5(100∶45) | 6(100∶47) |
| Example 5 | 7(100∶42) | 8(100∶45) |
| Example 6 | 9(100∶43) | 10(100∶46) |
The obtained molded foam for automobile 0-10 was subjected to the relevant performance test, and the results are shown in tables 2-4.
TABLE 2 mechanical Property testing
TABLE 3 odor test VDA270
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | |
| Smell(s) | 3.5 | 3.0 | 3.5 | 2.5 | 3.0 | 3.0 | 3.5 | 2.5 | 3.0 | 2.3 | 3.0 |
TABLE 4 pentabenzenetrialdehyde and TVOCTesting
Although the present invention has been described with reference to the specific embodiments, it is not intended to limit the scope of the present invention, and various modifications and variations can be made by those skilled in the art without inventive changes based on the technical solution of the present invention.
Claims (10)
1. The preparation method of the low-odor isocyanate mixture is characterized in that the low-odor isocyanate mixture is obtained by heating, stirring and reacting the component A and the component B; wherein, the component A is a substance containing active hydrogen, and the component B contains isocyanic acid radical.
2. The method of claim 1 wherein said a component comprises an alcohol mixture C.
3. The method according to claim 2, wherein the alcohol mixture C comprises a small molecule alcohol E, a polyol F, or a mixture of both.
4. The process according to claim 3, wherein the small-molecular alcohol E in the alcohol mixture C has a carbon number of 2 to 6, an average functionality of 2 to 6, and a relative molecular mass of 30 to 300 g/mol; the polyol F in the alcohol mixture C had a relative molecular mass of 150-2000g/mol and a functionality of 2-6.
5. The method according to claim 2, wherein the component A further contains an amine substance D.
6. The method according to claim 5, wherein the amine in the amine-based substance D has a relative molecular mass of 30 to 1000 g/mol.
7. The method of claim 1, wherein the B component comprises one or more organic polyisocyanates; the polyisocyanates are represented by the general formula R (nco) n, wherein R represents an aliphatic hydrocarbon group having 2 to 18 carbon atoms, an aromatic hydrocarbon group having 6 to 15 carbon atoms or an araliphatic hydrocarbon group having 8 to 15 carbon atoms, and n is 2 to 4.
8. The preparation method according to claim 1, wherein the A component is used in an amount of 0.1 to 30% by weight in the whole system; the content of the isocyanate group in the isocyanate addition product finally obtained by the reaction of the component A and the component B is 10-50 percent of NCO percent.
9. A low-odor isocyanate mixture obtained by the preparation method of claims 1 to 8.
10. Use of a low-odor isocyanate mixture as claimed in claim 9 in molding foams for automobiles.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4276127A1 (en) * | 2022-05-12 | 2023-11-15 | Covestro Deutschland AG | Isocyanate reactive composition for preparation of a polyurethane composite |
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