JPH0228611B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a method for producing a polyurethaneurea polymer obtained by a polyaddition reaction between a polyether polyol derivative having at least one terminal amino group and a polyisocyanate. (Prior Art) In the reaction of polyol derivatives having terminal amino and hydroxyl groups with polyisocyanates, polyurethane urea polymers containing urea groups are obtained, and compared with polyurethanes obtained from the corresponding polyols and polyisocyanates, It has many significant advantages. In particular, the polyurethane urea obtained by the polyaddition reaction of the polyether polyol derivative having at least one terminal amino group with a polyisocyanate according to the invention has higher heat resistance and stronger mechanical strength than the structurally equivalent polyurethane. It has a strong objective. U.S. Pat. No. 4,328,322 discloses a polyaddition reaction between a polyisocyanate and a para-aminobenzoic acid ester of a polyol, in which the polyol is reacted with para-nitrobenzoic acid chloride, and then all the terminal hydroxyl groups of the polyol are converted to amino groups by reducing the nitro group. The resulting polymers are disclosed. The present invention is to obtain a polyurethane urea polymer by the polyaddition reaction of a polyether polyol derivative in which the ends of a polyether polyol are partially para-aminobenzoic acid ester and a hydroxyl group is left, and a polyisocyanate, and a nitro compound is not reduced in the middle. It does not involve any reaction. Therefore, the polymer of the present invention is completely different from the polymer of US Pat. No. 4,328,322 in terms of chemical structure and manufacturing method. Also, in JP-A No. 55-40742, polyol and p-
A polyurethane elastomer is produced by reacting a polyisocyanate with a p-aminobenzoic acid ester of a polyol whose terminal hydroxyl groups are all converted to amino groups by reducing the nitro compound obtained by reacting with nitrobenzoyl chloride. The method is described. However, this polymer is also completely different from the polymer of the present invention in its chemical structure and manufacturing method. (Problems to be Solved by the Invention) The purpose of the present invention is to provide a simple method for producing a polyurethaneurea polymer by a polyaddition reaction between a polyether polyol derivative having an amino group and a hydroxyl group at the terminal and a polyisocyanate. be. (Means for Solving the Problems) The present invention is characterized by (a) reacting 0.125n to nmol of para-aminobenzoic acid alkyl ester with 1 mole of n-valent polyoxyalkylene polyol having a molecular weight of 400 to 10,000, [n is an integer from 2 to 8, x is the average value, 0.05n
Indicates a positive number from (n-1), A is the molecular weight
This shows an n-valent polyoxyalkylene polyol residue obtained by removing the hydroxyl group from an n-valent polyoxyalkylene polyol of 400 to 10,000. ]
A polyether polyol derivative having an average of at least one terminal amino group in which at least one hydroxyl group of an n-valent polyoxyalkylene polyol represented by is substituted with para-aminobenzoic acid ester is obtained, and then this is (b) A method for producing a polyurethaneurea polymer characterized by reacting at least a divalent polyisocyanate. The polyether polyol derivative having at least one terminal amino group used in the present invention is dealcolated by transesterifying a di- to octavalent polyoxyalkylene polyol with a molecular weight of 400 to 10,000 and a p-aminobenzoic acid alkyl ester. Manufactured by a simple single-step synthetic method. The polyether polyol derivative obtained by this method is a partially esterified product in which some unreacted hydroxyl groups remain, and the degree of esterification, that is, the degree of amine conversion, can vary over a wide range depending on the application. It is necessary that on average at least one hydroxyl group of the polyether polyol is esterified, and preferably the esterification rate, that is, the amine conversion rate is about 50 to 95%. Therefore, the polyether polyol derivative having at least one terminal amino group on average used in the present invention is a para-aminobenzoic acid alkyl ester per mole of n-valent polyoxyalkylene polyol.
Obtained by reacting 0.125n to nmol. Suitable examples of the above polyoxyalkylene polyols include water, low molecular weight polyols,
A di- to octavalent polyether polyol with a molecular weight of 400 to 10,000 obtained by addition polymerization of one or more alkylene oxides such as ethylene oxide, propylene oxide, and tetrahydrofuran in any order in the presence of a suitable initiator such as a low molecular weight amine. These can be obtained by known methods. Examples of low molecular weight polyols suitable as the above-mentioned initiators include ethylene glycol, propylene glycol, 1,4-butanediol, 1,6
-Hexanediol, glycerin, trimethylolpropane, pentaerythritol, sorbitol, sucrose, hydroquinone, 2,2-bis(4-hydroxyphenyl)propane, etc., and low molecular weight amines include methylamine, butylamine, ethylenediamine, Examples include aniline and tolylene diamine, and alkanolamines such as ethanolamine, diethanolamine, and triethanolamine can also be used. Among the above polyoxyalkylene polyols,
When the resulting polyether polyol derivative having at least one terminal amino group of the present invention is used as a raw material for elastomer synthesis, divalent to trivalent polyoxytetramethylene glycol, polyoxypropylene having a molecular weight of 1000 to 4000, Polyols, polyoxypropylene polyoxyethylene polyols, and the like are suitable. In addition, when used as a synthetic raw material for soft or semi-rigid foams, molecular weight
Tri- to hexavalent polyoxypropylene polyols and polyoxypropyleneoxyethylene polyols having a valence of 1,000 to 10,000 are suitable. In addition, when used as a synthetic raw material for hard resins and foams, the molecular weight is 400.
-1500 tri- to octavalent polyoxypropylene polyols are preferred. Examples of para-aminobenzoic acid alkyl esters used in the present invention include methyl, ethyl, isopropyl, n-propyl, isobutyl, n-butyl, t-butyl, and isoamyl esters of para-aminobenzoic acid, among which methyl and ethyl esters is particularly suitable. The transesterification reaction between the polyoxyalkylene polyol and para-aminobenzoic acid alkyl ester is carried out without a catalyst or in the presence of a known esterification catalyst, usually by heating at 150 to 250°C while passing an inert gas such as nitrogen gas. This is achieved by doing the following. When using a catalyst, it is preferable to use a weakly acidic or weakly basic catalyst that does not produce ether or olefin upon dehydration of the polyol, such as metal oxides such as antimony trioxide and lead monoxide, tetraisopropyl titanate, and tetrabutyl. Organotitanium compounds such as titanates,
Examples include alkaline earth metal salts of weak acids such as calcium acetate, and organic titanium compounds are particularly preferred. The amount of catalyst is usually 1000 ppm or less, preferably 100 ppm or less. In addition, an inert solvent and a coloring inhibitor such as triphenyl phosphate can also be used in the reaction. The reaction may be continued until the alcohol has been distilled off, and then the pressure of the system is reduced to completely distill off the alcohol and, if present, the excess para-aminobenzoic acid alkyl ester. No particular purification is required. The polyisocyanate used in the present invention may be any polyisocyanate known in polyurethane chemistry, for example hexamethylene diisocyanate, isophorone diisocyanate, 4,4'-dicyclohexylmethane diisocyanate, 2,4-tolylene diisocyanate (2, 4-TDI), 2,6-tolylene diisocyanate (2,6-TDI), 4,4'-diphenylmethane diisocyanate (MDI), carbodiimide-modified MDI, polymethylene polyphenyl polyisocyanate (PAPI), ortho-toluidine diisocyanate (TODI), naphthylene diisocyanate (NDI), xylene diisocyanate (XDI), etc., and one type or two or more types can be used. The production of polyurethane ureas according to the invention by polyaddition reaction of polyether polyol derivatives having at least one terminal amino group with polyisocyanates may be carried out by any method known in polyurethane chemistry. This means that the reaction may be carried out in the presence of active hydrogen group-containing compounds such as long-chain polyols, short-chain polyols, short-chain polyamines, and water that can react with isocyanates. Also all additives known in polyurethane chemistry, such as catalysts, flame retardants, plasticizers, fillers,
This means that blowing agents, anti-aging agents, pigments, inert organic solvents, etc. may be added. In the present invention, for example, to produce an elastomer, it is preferable to carry out the production in the presence of a suitable chain extender. Examples of the chain extender include di- to tetrafunctional polyols with a molecular weight of 500 or less and diamines having a primary or secondary terminal amino group with a molecular weight of 500 or less. Suitable chain extenders include (a) ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, butanediol, hexanediol,
Polyols such as glycerin, trimethylolpropane, pentaerythritol, sorbitol, 1,4-cyclohexanediol, 1,4-cyclohexanedimethanol, xylylene glycol (b) Hydrazine, ethylenediamine, tetramethylenediamine, hexamethylenediamine, 1,
4-cyclohexanediamine, phenylenediamine, xylylenediamine, 2,4-tolylenediamine, 4,4'-diaminodiphenylmethane, 3,3'-dichloro-4,4'-diaminodiphenylmethane, 1, Diamines such as 4-dichloro-3,5-diaminobenzene and 1,3-propanediol dip-para-aminobenzoate (c) Alkanolamines such as ethanolamine, diethanolamine, and triethanolamine (d) Hydroquinone, pyrogallol, 4,4 '-Isopropylidene diphenol, aniline, and polyols with a molecular weight of 500 or less obtained by adding propylene oxide and/or ethylene oxide to the above polyols, diamines, and alkanolamines in any order, etc.
Among these, diamines are preferred in order to enhance the effects of the present invention. In the present invention, the polyaddition reaction between a polyether polyol derivative having at least one terminal amino group and a polyisocyanate is usually preferably carried out in an isocyanate index range of 95 to 120. The same holds true even in the presence of other active hydrogen compounds. Usually, the polyether polyol derivative is reacted with the molten polyisocyanate at room temperature or around the melting temperature of the polyisocyanate. When using a polyisocyanate that is liquid at room temperature, the reaction system can be at room temperature. high molecular weight polyol,
When the reaction is carried out in the presence of a chain extender or a blowing agent, these components are preferably mixed and dissolved in the polyether polyol derivative in advance. Also effective is the so-called prepolymer method, in which part or all of the polyether polyol derivative is reacted in advance with excess polyisocyanate to form an isocyanate-terminated prepolymer and reacted with the remaining polyether polyol derivative and/or chain extender. It's a method. In this case, the prepolymer is preferably heated to 60 to 80° C. or higher or dissolved in an inert solvent in order to lower the viscosity and improve processability. Further, when the polymer of the present invention is made into an elastomer by casting, it is preferable that the mold temperature is usually 50 to 100°C. When the polymer of the present invention is made into a foam, the reaction may be carried out in the presence of a blowing agent such as water or a low-boiling compound such as monochlorotrifluoromethane. In the polyaddition reaction between a polyether polyol derivative having at least one terminal amino group and a polyisocyanate in the present invention, the reaction activity is high and moderate compared to the polyaddition reaction between a corresponding polyether polyol and a polyisocyanate. . This is because the amino group has higher activity than the hydroxyl group and because the terminal amino group has an ester group at the para position via an aromatic ring, the electronic substituent effect of the ester group moderately suppresses the reactivity of the amino group. It is presumed that this is because If the terminal amino group is an aliphatic or aromatic group with no substituent effect, the polyaddition reaction with isocyanates is very fast and cannot be easily controlled, making it difficult to use, for example in the presence of organic solvents. Usage is limited. As described above, the polyaddition reaction of the present invention has an appropriate activity, and therefore has extremely high practical utility. Furthermore, the polyadduct obtained in the present invention has excellent heat resistance and mechanical strength due to its structure, and is clearly different from the corresponding conventional polyurethane. (Example) The present invention will be specifically described below with reference to Examples and Comparative Examples. Example 1 Polytetramethylene glycol (Mitsubishi Kasei,
PTMG1500, MW1498) 545g (0.364 mol), ethyl para-aminobenzoate (Hani Chemicals, reagent
GR) and 0.033 g of tetrabutyl titanate were heated in a three-necked flask while passing dry nitrogen gas, and when the temperature reached 180°C, ethyl alcohol began to distill out. gradually raise the temperature
When the temperature reached 200°C, the distillation of ethyl alcohol stopped at 82% of the theoretical amount. The temperature was further raised to 215°C and maintained for 2 hours, and then the pressure was reduced to distill off unreacted ethyl para-aminobenzoate. Yield: 622g, 27℃
A pale yellow liquid with a viscosity of 6200 cps was obtained. From titration with perchloric acid in glacial acetic acid (Analytical Chemistry Handbook Revised Edition 3rd Edition, page 261), the amine value is
It was 1.045meq/g. Also, hydroxyl value measurement method (JISK1557) that can measure the total amount of hydroxyl groups and amino groups.
According to the study, it was 1.172meq/g. When this product was analyzed by gel permeation chromatography, no free ethyl para-aminobenzoate was detected, and the single peak molecular weight distribution was consistent with that of the raw material.
It was almost the same as PTMG1500. Accordingly
This means that 89.2% of the terminal hydroxyl groups of PTMG1500 were converted to amino groups. 170g of this polyol derivative was heated to 50℃,
4,4′-diphenylmethane diisocyanate (MDI, manufactured by Nippon Polyurethane Co., Ltd., Millionate
MT) 26.4g was melted and brought to 50°C, and both were mixed for 30 seconds using a propeller type stirrer. The mixture was then defoamed for 1 minute in a vacuum desiccator and poured into an iron mold heated to 55°C. Pot life was 8 minutes. Next, the entire mold was placed in an oven at 110°C, removed from the mold after 1 hour, and further cured at 120°C for 3 hours to obtain a plate-like elastomer with a thickness of 2 mm. After curing at room temperature for 7 days, physical properties were measured according to JIS K6301. The results are shown in Table 1. Example 2 3,3'-dichloro-4,4'-diaminodiphenylmethane (manufactured by Ihara Chemical Co., Ltd., Kyuamine MT) was added to 150 g of the polyol derivative synthesized in Example 1.
A mixture of 11.7g at 50℃ and a melt at 50℃
An elastomer was synthesized in the same manner as in Example 1 using 34.6 g of MDI. Pot life was 6 minutes. The physical properties are shown in Table 1. Example 3 A mixture of 21.9 g of 3,3'-dichloro-4,4'-diaminophenylmethane dissolved in 140 g of the polyol derivative synthesized in Example 1 at 50°C and 43.1 g of molten MDI at 50°C were used. An elastomer was synthesized in the same manner as in Example 1. Pot life was 3 minutes. The physical properties are shown in Table 1. Comparative Example 1 Corresponding to Example 3 for comparison
An attempt was made to synthesize an elastomer by the so-called one-shot method using PTMG1500, 3,3'-dichloro-4,4'-diaminodiphenylmethane, and MDI, but a good elastomer could not be obtained.
The reason seems to be that there is too much of a difference in reaction rate between polyol and diamine with polyisocyanate.
Therefore, I had no choice but to synthesize it using the prepolymer method as described below. used in Example 1
PTMG1500 (400g) and MDI134g were reacted at 90°C for 3 hours with stirring in a 3-necked separable flask purged with nitrogen to obtain a prepolymer with an NCO content of 4.09%. 150g of this prepolymer
The mixture was heated to 70°C, 18.6 g of 120°C molten 3,3'-dichloro-4,4'-diaminodiphenylmethane was added, stirred for 30 seconds, defoamed for 1 minute, and poured into a mold at 80°C. The mold was removed after 1 hour and then heated in an oven at 120°C for 3 hours. Table 1 shows the physical properties after curing for 7 days at room temperature.

[Table] Example 4 560 g (0.374 mol) of the same polytetramethylene glycol “PTMG1500” used in Example 1,
Synthesis was carried out in the same manner as in Example 1 using 74 g (0.448 mol) of ethyl para-aminobenzoate, yielding 611 g of a pale yellow liquid with a viscosity of 4120 cps at 25°C. The amine value was 0.684 meq/g, and the total amount of amino groups and hydroxyl groups was 1.230 meq/g. Therefore, 55.6% of the terminal hydroxyl groups of the polyol were converted to amino groups. 200g of this polyol derivative and 2,4-tolylene diisocyanate (manufactured by Mitsubishi Chemical Corporation, TDI-100)
A prepolymer having an NCO content of 3.87% was synthesized in the same manner as in Comparative Example 1 using 42.8 g. Viscosity is 80℃
It was 11,000 cps in . 150 g of the above prepolymer at 80°C and 17.5 g of 3,3'-dichloro-4,4'-diaminodiphenylmethane melted at 120°C were mixed, defoamed, and poured into an iron mold heated to 100°C. 1 in the oven
After holding for a period of time, the mold was demolded. Next, this thickness is 2mm
The plate-like elastomer was heated in an oven at 110°C overnight, and after curing at room temperature for 7 days, physical properties were measured. The results are shown in Table 2. Comparative Example 2 In order to compare with Example 4, the same procedure as in Comparative Example 1 was carried out using 500 g of the same polytetramethylene glycol "PTMG1500" used in Example 1 and 116 g of 2,4-tolylene diisocyanate.
A prepolymer with an NCO content of 4.32% was synthesized.
150g of this prepolymer heated to 80℃ and 120℃
An elastomer was synthesized in the same manner as in Example 4 using 19.5 g of 3,3'-dichloro-4,4'-diaminodiphenylmethane molten. Same physical properties as second
Shown in the table.

[Table] Example 5 Using 502 g (0.485 mol) of polytetramethylene glycol (PTMG-1000 manufactured by Mitsubishi Kasei Corporation) with a molecular weight of 1035, 160 g (0.970 mol) of ethyl para-aminobenzoate, and 0.13 g of tetrabutyl titanate, the same procedure as that of Example 1 was carried out. The reaction was carried out in the same manner. Yield 622g,
A pale yellow liquid with a viscosity of 5600 cps at 27°C was obtained. The amine value was 1.427 meq/g, and the total of amino groups and hydroxyl groups was 1.594 meq/g, which means that 89.5% of the terminal hydroxyl groups of the polyol were converted to amino groups. 170 g of this polyol derivative was heated to 45°C, 35.8 g of molten MDI at 50°C was added, mixed, defoamed, and poured into an iron mold at 40°C. Pot life was 9 minutes. After 1 hour, it was removed from the mold, heated in an oven at 120℃ for 3 hours, and cured at room temperature for 7 days.
Physical properties were measured. The results are shown in Table 3.

[Table] Example 6 Polyoxypropylene glycol capped with ethylene oxide (Mitsui Nisso Urethane,
Synthesis was performed in the same manner as in Example 1 using 568 g (0.292 mol) of ED56, MW1944), 93.2 g (0.564 mol) of ethyl para-aminobenzoate, and 0.04 g of tetrabutyl titanate. The yield was 624 g, and the viscosity at 27°C was 1890 cps. A yellow liquid was obtained. The amine value was 0.804 meq/g, and the total amount of amino groups and hydroxyl groups was 0.934 meq/g. Therefore, 86.1% of the terminal hydroxyl groups of the polyol were converted to amino groups. The same procedure as in Comparative Example 1 was carried out using 300 g of this polyol derivative and 49 g of a mixed polyisocyanate (manufactured by Mitsubishi Chemical Corporation, TDI-80) of 80:20 of 2,4-tolylene diisocyanate and 2,6-tolylene diisocyanate. A prepolymer with an NCO content of 3.30% was synthesized. The above prepolymer heated to 65℃
150g and 3,3'-dichloro-4 melted at 100℃,
15 g of 4'-diaminodiphenylmethane was mixed, defoamed, and poured into an iron mold heated to 75°C. Pot life was 12 minutes. Demold after 1 hour 110
After heating in an oven at °C overnight and curing at room temperature for 7 days, physical properties were measured. The results are shown in Table 4. Comparative Example 3 NCO content was determined in the same manner as Comparative Example 1 using the corresponding polyol and TDI80 for comparison in Example 6.
A 3.37% prepolymer was synthesized. A comparative elastomer was obtained in the same manner as in Example 6 using 150 g of this prepolymer and 15.3 g of 3,3'-dichloro-4,4'-diaminodiphenylmethane. 4th result
Shown in the table.

[Table] Example 7 Trifunctional polyoxypropylene polyol capped with ethylene oxide at the end (manufactured by Sumitomo Bayer Urethane, "SBU Polyol 0262")
Synthesis was performed in the same manner as in Example 1 using 583 g (0.194 mol) of MW3005), 77 g (0.466 mol) of ethyl para-aminobenzoate, and 0.33 g of tetrabutyl titanate, yielding 635 g and a yellow liquid with a viscosity of 1440 cps at 25°C. . Amine value 0.672meq/g,
The total amount of amino groups and hydroxyl groups was 0.921 meq/g.
Therefore, 73.0% of the terminal hydroxyl groups of the polyol were converted to amino groups. 90g of this polyol derivative, 10g of aromatic diamine-based polyoxypropylene polyol (manufactured by Takeda Pharmaceutical Company, GR-30, OHV400), and 1g of pure water.
Mix 0.33g of diethylenetriamine and bring the liquid temperature to 30.
℃, and polymeric polyisocyanate (Sumitomo Bayer Urethane Co., Ltd. "Sumiyur") at 30℃.
44V20'', NCO content 31.5%) was added and stirred vigorously for 10 seconds, then poured into a 10 cm x 10 cm paper box and foamed. Foaming stops in about 2 minutes and the density is 0.086.
A foam of g/cm ³ was obtained. When the physical properties were measured one week later, the physical properties shown in Table 5 were obtained. The compression test was based on JIS K6401. Comparative Example 4 For comparison with Example 7, a foam having a density of 0.090 g/cm ³ was synthesized in the same manner as in Example 7 using the corresponding polyol "SBU Polyol 0262". The physical properties are shown in Table 5.

【table】

Claims (1)

[Claims] 1 (a) 1 mole of n-valent polyoxyalkylene polyol having a molecular weight of 400 to 10,000 is reacted with 0.125n to nmol of para-aminobenzoic acid alkyl ester to obtain the general formula [n is an integer from 2 to 8, x is the average value
Indicates a positive number from 0.05n to (n-1), A
represents an n-valent polyoxyalkylene polyol residue obtained by removing the hydroxyl group from an n-valent polyoxyalkylene polyol having a molecular weight of 400 to 10,000. ] to obtain a polyether polyol derivative having at least one terminal amino group on average, in which at least one hydroxyl group on average is substituted with para-aminobenzoic acid ester of an n-valent polyoxyalkylene polyol, and then this (b) A method for producing a polyurethaneurea polymer, which comprises reacting at least a divalent polyisocyanate.