CN1082504C - Novel aromatic diamine chain stretching agent, its prepn. method and applications - Google Patents
Novel aromatic diamine chain stretching agent, its prepn. method and applications Download PDFInfo
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- CN1082504C CN1082504C CN 99113451 CN99113451A CN1082504C CN 1082504 C CN1082504 C CN 1082504C CN 99113451 CN99113451 CN 99113451 CN 99113451 A CN99113451 A CN 99113451A CN 1082504 C CN1082504 C CN 1082504C
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Abstract
The present invention discloses a novel aromatic diamine chain extender, a preparation method and application thereof. The chain extender uses methylene as a bridged group, o-chloroaniline and o-Ethylaniline are connected to synthesize liquid aromatic diamine chain extender-3, -chloro, 3'-ethyl, 4, 4'-diaminodiphenylmethane (CEMDA for short). The chain extender has the advantages of simple preparation process, mild reaction condition, medium activity, easy mold charging, convenient demoulding and uncoursed performance of products, and the viscosity is low after the chain extender dissolves in polyatomic alcohol; the chain extender also has better shock mixing effect, favorable performance of final product, excellent tensile performance, excellent tear impacting performance and excellent flexural performance. The chain extender can be used for an RIM synthesized polyurethane-urea (PUU) system or an RIM synthesized full polyurea system and can also be applied into other polymerizing systems, such as a curing agent of epoxy resin, etc.
Description
The invention belongs to the synthetic field of macromolecular material, relate to a kind of diamine chain extenders, relate in particular to a kind of chainextender of reaction under high pressure injection molding polyurethane-urea.
As everyone knows, urethane is called for short PU, is a kind of purposes macromolecular material very widely.PU is generally formed by polyethers or polyester polyol and polyisocyanates polycondensation, in order to enlarge the range of application of PU material, improve its various physicalies, for this reason, in the PU technical recipe of being everlasting, add one or more small molecules dibasic alcohol (being commonly referred to chainextender).Polyurethane-urea (PUU) is that the small molecules dibasic alcohol in the PU system is replaced with diamine, and generates the polymkeric substance that contains carbamate-urea groups mixing chain link.Because the specific activity dibasic alcohol chainextender of diamine chain extenders is active much higher, can make the polyurethane-urea (PUU) of gained have solidification rate faster, improved production efficiency, green strength in the time of simultaneously also can improving its demoulding, in addition, because the formation of urea groups, the mechanical property of goods especially Young's modulus, thermal dimensional stability all are better than containing the goods of dibasic alcohol chainextender, so diamine chain extenders has obtained people and has paid attention to widely.
At present, the industrial diamine chain extenders of generally using is the disclosed diethyl toluene diamine of German Patent D.E.3402983 (DETDA), this chainextender is applied to reaction under high pressure injection molding (being called for short RIM) when producing polyurethane-urea, material viscosity is low, active moderate, the mechanical property of goods is good, and showing slightly insufficient is that this chainextender is active higher for large-scale polyurethane-urea product, the insufficient phenomenon of mold filling often occurs.U.S. aerochemistry company has released 4-tert-butyltoluene diamines (t-BTDA) in the early 1990s and has attempted to replace DETDA, because the reactive behavior of t-BTDA is low than DETDA, thereby can the finish size bigger product and the high strength product of faster response formula system.
The production method of above-mentioned two kinds of chainextenders is all very harsh, all need under high temperature and high pressure, to form by tolylene diamine and olefin alkylation reaction, according to German patent DE 34,02,983 disclosed technology, needing to select Al-Zn alloy and aluminum chloride for use under the high temperature of the high pressure of 20MPa and 290～300 ℃ is that catalyzer could obtain DETDA; Japanese Patent JP05,201,934 adopt triethyl aluminums to make catalyzer, but still need just can make under the condition of 8MPa and 300～310 ℃, so the production of this chainextender is very high to the requirement of equipment, has limited it in industrial applying.
The objective of the invention is to disclose a kind of performance and DETDA quite but can under normal pressure and lesser temps, just can synthesize, the liquid aromatic diamine chain stretching agent of suitable RIM technology, to overcome the above-mentioned defective of prior art.
Design of the present invention is such:
The present invention is abutment with the methylene radical, and Ortho-Chloro aniline and o ethyl aniline are coupled together, synthetic a kind of liquid aromatic diamine chain stretching agent.Owing on the aromatic ring of aniline, introduce different electron-withdrawing groups and scold electron group, can change amine groups electronegativity on the phenyl ring, to reach the purpose of regulating two phenyl ring diamines and isocyanate reaction speed, simultaneously, because the group of being introduced has bigger steric effect and relatively poor symmetry on phenyl ring, can reduce the regularity of two phenyl ring, thereby at room temperature this chainextender is in a liquid state, and meets the requirement of RIM technology.
The said chainextender of the present invention is the compound with following structural formula:
Its chemical name is: 3-chloro-3 '-ethyl-4, and 4 '-diaminodiphenyl-methane is called for short CEMDA, and English name is: 3-Chloro-3 '-ethyl-4,4 '-methylenedianiline.Its materialization data are as follows: occur following characteristic peak in nmr spectrum simultaneously: occur near δ=1.23ppm occurring occurring occurring multiplet occurring near unimodal δ=7.0～6.5ppm near unimodal δ=3.82ppm near quartet δ=3.77ppm near triplet δ=2.50ppm
The said chainextender CEMDA of the present invention also is preparation like this:
In inert gas atmosphere, formalin is added drop-wise in the mixed aqueous solution of Ortho-Chloro aniline, o ethyl aniline and acid and carries out condensation reaction, its reaction formula is:
After reaction finishes, adopt conventional method from reactant, to collect target product: reaction product to be neutralized to pH=7～10 with alkaline aqueous solution, steam distillation is removed unreacted intact Ortho-Chloro aniline and o ethyl aniline, use warm water repetitive scrubbing reaction product (thick CEMDA) again, and carry out the drying under reduced pressure dehydration, obtain purified CEMDA.
The processing condition of reaction are such:
The mol ratio of Ortho-Chloro aniline and o ethyl aniline is: Ortho-Chloro aniline: o ethyl aniline=1: (0.5～2), the Ortho-Chloro aniline consumption is too high or too low all can to generate too much by product, influence the purity of chainextender, when the Ortho-Chloro aniline consumption is too high, the chainextender activity of making is lower, will prolong demould time, not meet the processing requirement of RIM; Cross when low when the Ortho-Chloro aniline consumption, the chainextender activity of making is higher, brings certain difficulty for the mold filling of RIM PUU goods.Therefore, the optimum mole ratio of Ortho-Chloro aniline and o ethyl aniline is:
Ortho-Chloro aniline: o ethyl aniline=1: (0.95～1.05);
Said acid is the catalyzer of reaction process, can select common example hydrochloric acid, sulfuric acid, nitric acid or phosphoric acid etc. for use, and its concentration in total material is 1～5mol/L, is preferably with 2～4mol/L;
The mol ratio of formaldehyde and Ortho-Chloro aniline and o ethyl aniline mixture is
Formaldehyde: Ortho-Chloro aniline and o ethyl aniline mixture=1: (04～0.6)
Temperature of reaction is 50～100 ℃, with 70～95 ℃ be the best, along with the rising of temperature, degree of purity of production and yield all can improve, but temperature of reaction the poly reaction will take place when too high, generates the polyfunctionality arylamine;
Reaction times is 1～10 hour, and along with the prolongation in reaction times, degree of purity of production and yield all can improve, but undue time expand can reduce production efficiency, therefore optimum with 4～6 hours;
Said rare gas element is nitrogen or argon gas etc.
With infrared spectrometric analyzer, nuclear magnetic resonance analyser and mass spectrograph purified CEMDA is carried out structural characterization, the result shows really be 3-chloro-3 '-ethyl-4,4 '-diaminodiphenyl-methane.
The said CEMDA of the present invention is used for RIM technology mainly as chainextender, and synthesis of polyurethane-urea (PUU) also can synthesize full polyureas.Because low, the good fluidity of RIM processing requirement reaction mass viscosity; Moderate, the slaking at a lower temperature of reactive behavior; Initial product intensity height, the easily demoulding; Therefore can mainly contain with the compatible raw material of said chainextender:
(1) polyether glycol---mainly be high reactivity, high-molecular-weight poly (ethylene oxide-capped propylene oxide) copolyether, its proportion of primary OH groups can be up to 80%, and molecular weight is good with 4000～6000 generally;
(2) amine end capped polyether---based on polyether glycol, wherein the terminated hydroxyl is replaced by primary amino or secondary amino group functional group, is mainly used in the full polyureas product of preparation RIM;
(3) isocyanic ester---nearly all be to adopt diphenylmethanediisocyanate (MDI) series product, this is because the steam of this kind isocyanate forces down, and handles easy to usely, and reactive behavior is high again, and shaping cycle is lacked, and the initial intensity height the during demoulding.But pure MDI at room temperature is a solid, be difficult to direct use, the general product that passes through after the modification that all uses, the isocyanic ester that is applied to RIM technology at present mainly contain the imine modified MDI of the MDI of polymeric MDI (PAPI), urethane-modified MDI, carbodiimide modification and phenodiazine cyclobutanone etc.;
(4) catalyzer---catalyzer commonly used has tertiary amines, as: triethylenediamine, two (dimethylamino) ethyl ether, dimethylcyclohexylamine, triethylamine etc.; Organic tin, as: stannous octoate and dibutyl tin laurate etc.The processing parameter of its building-up process is identical with conventional RIM synthesis of polyurethane-urea (PUU) or the synthetic full polyurea system of RIM with prescription.
Adopt above-mentioned raw materials and the said chainextender of the present invention on portable minisize RIM machine (according to U.S.P.4,189,070 (1980) make), to test evidence:
(1) said chainextender activity is moderate, and mold filling is easy, is convenient in demoulding, and goods are not stratified;
(2) viscosity was lower after said chainextender was dissolved in polyvalent alcohol, had and clashed into mixed effect preferably;
(3) the finished product performance is good, has excellent tensile properties, impart tear and anti-bending strength.
The said chainextender of the present invention is not limited to be applied to also can be applicable in other polymerization system in the synthetic full polyurea system of RIM synthesis of polyurethane-urea (PUU) or RIM, as curing agent for epoxy resin etc.
Below will be further described content of the present invention by embodiment.
Embodiment 1
One be equipped with stir and the 500ml four-hole boiling flask of nitrogen protection device in add 96.7 gram water, 74 grams 36% hydrochloric acid, 42.1 gram Ortho-Chloro anilines, 40 restrain o ethyl anilines; after being uniformly dispersed; drip the formaldehyde solution of 25.7 grams 37%; 90 ℃ of following back flow reaction 6 hours; be cooled to 60 ℃; the NaOH aqueous solution with 20% (wt%) is neutralized to pH=8 with reaction product; steam distillation is removed the intact arylamine of unreacted; wash reaction product with warm water; till can not checking flocks with Silver Nitrate; carry out the drying under reduced pressure dehydration at last, obtain to be brown liquid.With high performance liquid chromatography, infrared spectrometric analyzer, nuclear magnetic resonance analyser and mass spectrograph product is carried out structural characterization, the result shows that product purity is 88.7% (wt%), and its structure really is 3-chloro-3 '-ethyl-4,4 '-diaminodiphenyl-methane (CEMDA).
Embodiment 2
One be equipped with stir and the 2000ml four-hole boiling flask of nitrogen protection device in add 539 gram water, 296 grams 36% hydrochloric acid, 160 gram Ortho-Chloro anilines, 167 restrain o ethyl anilines; after being uniformly dispersed; drip the formaldehyde solution of 106.8 grams 37%; reacted 6 hours down at 80 ℃; be cooled to 60 ℃; the NaOH aqueous solution with 20% (wt%) is neutralized to pH=8 with reaction product; steam distillation is removed the intact arylamine of unreacted; wash reaction product with warm water; till can not checking flocks with Silver Nitrate; carry out the drying under reduced pressure dehydration at last, obtain to be brown liquid.With high performance liquid chromatography, infrared spectrometric analyzer, nuclear magnetic resonance analyser and mass spectrograph product is carried out structural characterization, the result shows that product purity is 81.3% (wt%), and its structure really is 3-chloro-3 '-ethyl-4,4 '-diaminodiphenyl-methane (CEMDA).
Embodiment 3
According to a certain ratio with 3-chloro-3 '-ethyl-4,4 '-diaminodiphenyl-methane (CEMDA), polyether glycol and catalyst mix are even, place the A barrel of portable minisize RIM machine, again isocyanic ester is added the B barrel, the temperature of charge of A, B tube is respectively 60 ℃ and 30 ℃, two strands of materials of A, B inject mould (demoulding after 110 * 110 * 2mm), 1 minute, the acquisition RIM-PUU elastomer sample of 70 ℃ of preheatings through the high pressure bump.
The various raw materials and the proportioning that are added are as follows:
(1) polyether glycol is poly-(ethylene oxide-capped propylene oxide) the copolyether trivalent alcohol (GEP-330N) of high reactivity, and hydroxyl value is 35, (Shanghai Gaoqiao petrochemical industry chemical industry three factory's products), and add-on is 100 parts (weight, down together);
(2) catalyzer is dibutyl tin laurate (DBTDL), (Beijing chemical industry two factories), and add-on is 0.5 part;
(3) chainextender CEMDA add-on is 84 parts;
(4) isocyanic ester of carbodiimide modification, (Yantai Synthetic Leather General Factory), isocyano-content is 28.6%, and isocyanate index is 120, and add-on is 125 parts;
(5) triethylene diamine (DABCO 33-LV) is by U.S. Air Products﹠amp; Chem., Inc. provides, and add-on is 0.5 part;
Gained RIM-PUU elastomer sample after tested, hard segment content is 58%, and the mechanical property of material is as follows: 685 70 ℃ of modulus in flexurees of 22.520 ℃ of modulus in flexurees of tensile strength (Mpa) 28.0 elongation at breaks (%) 17.0 tear strengths (N/mm) 10.6 flexural strengths (Mpa) (Mpa) (Mpa) 389
Embodiment 4
According to a certain ratio with 3-chloro-3 '-ethyl-4,4 '-diaminodiphenyl-methane (CEMDA), polyether glycol and catalyst mix are even, place the A barrel of portable minisize RIM machine, again isocyanic ester is added the B barrel, the temperature of charge of A, B tube is respectively 60 ℃ and 30 ℃, two strands of materials of A, B inject mould (demoulding after 110 * 110 * 2mm), 1 minute, the acquisition RIM-PUU elastomer sample of 70 ℃ of preheatings through the high pressure bump.
The various raw materials and the proportioning that are added are as follows:
(1) polyether glycol is poly-(ethylene oxide-capped propylene oxide) the copolyether trivalent alcohol (GEP-330N) of high reactivity, and hydroxyl value is 35, (Shanghai Gaoqiao petrochemical industry chemical industry three factories), and add-on is 100 parts (weight, down together);
(2) catalyzer is dibutyl tin laurate (DBTDL), (Beijing chemical industry two factories), and add-on is 0.5 part;
(3) chainextender CEMDA add-on is 37 parts;
(4) isocyanic ester of carbodiimide modification, (Yantai Synthetic Leather General Factory), isocyano-content is 28.6%, and isocyanate index is 120, and add-on is 61 parts;
(5) triethylene diamine (DABCO 33-LV) is by U.S. Air Products﹠amp; Chem., Inc. provides, and add-on is 0.5 part;
Gained RIM-PUU elastomer sample after tested, hard segment content is 40%, and the mechanical property of material is as follows: 118 70 ℃ of modulus in flexurees of 3.9420 ℃ of modulus in flexurees of tensile strength (Mpa) 17.4 elongation at breaks (%) 94.7 tear strengths (N/mm) 19.5 flexural strengths (Mpa) (Mpa) (Mpa) 57.0
Comparative Examples 1
Adopt the synthesis technique identical with embodiment 3, and replace CEMDA with 58 parts of DETDA, gained RIM-PUU elastomer sample after tested, hard segment content is 54%, and the mechanical property of material is as follows: 287 70 ℃ of modulus in flexurees of 9.420 ℃ of modulus in flexurees of tensile strength (Mpa) 24.7 elongation at breaks (%) 98.4 tear strengths (N/mm) 10.0 flexural strengths (Mpa) (Mpa) (Mpa) 192
Comparative Examples 2
Adopt the synthesis technique identical with embodiment 4, and replace CEMDA with 25 parts of DETDA, gained RIM-PUU elastomer sample after tested, hard segment content is 36%, and the mechanical property of material is as follows: 167 70 ℃ of modulus in flexurees of 5.4520 ℃ of modulus in flexurees of tensile strength (Mpa) 15.5 elongation at breaks (%) 248 tear strengths (N/mm) 17.9 flexural strengths (Mpa) (Mpa) (Mpa) 70.8
Claims (8)
1. aromatic diamine chain stretching agent is characterized in that having following chemical structural formula:
2. the preparation method of chainextender as claimed in claim 1 is characterized in that: formalin is added drop-wise in the mixed aqueous solution of Ortho-Chloro aniline, o ethyl aniline and acid and carries out condensation reaction, its reaction formula is:
After reaction finishes, adopt conventional method from reactant, to collect target product 3-chloro-3 '-ethyl-4,4 '-diaminodiphenyl-methane; The processing condition of reaction are such:
Temperature of reaction is 50～100 ℃, and the reaction times is 1～10 hour, and the mol ratio of Ortho-Chloro aniline and o ethyl aniline is: Ortho-Chloro aniline: o ethyl aniline=1: 0.5～2; The mol ratio of formaldehyde and Ortho-Chloro aniline and o ethyl aniline mixture is: formaldehyde: Ortho-Chloro aniline and o ethyl aniline mixture=1: 0.4～0.6; Said acid is a kind of in hydrochloric acid, sulfuric acid, nitric acid or the phosphoric acid, and its concentration in total material is 1～5mol/L, and building-up reactions is carried out in inert gas atmosphere.
3. method as claimed in claim 2 is characterized in that: the mol ratio of Ortho-Chloro aniline and o ethyl aniline is: Ortho-Chloro aniline: o ethyl aniline=1: 0.95～1.05.
4. method as claimed in claim 2 is characterized in that: temperature of reaction is 70～95 ℃.
5. method as claimed in claim 2 is characterized in that: the reaction times is 4～6 hours.
6. method as claimed in claim 2 is characterized in that: said acid is hydrochloric acid, and its concentration in material is 2～4mol/L.
7. method as claimed in claim 2 is characterized in that: said rare gas element is nitrogen or argon gas.
8. the application of chainextender as claimed in claim 1 is characterized in that: be used for reaction and injection molding process synthesis of polyurethane-urea or full polyureas.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 99113451 CN1082504C (en) | 1999-02-01 | 1999-02-01 | Novel aromatic diamine chain stretching agent, its prepn. method and applications |
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| CN 99113451 CN1082504C (en) | 1999-02-01 | 1999-02-01 | Novel aromatic diamine chain stretching agent, its prepn. method and applications |
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| CN1082504C true CN1082504C (en) | 2002-04-10 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101250114B (en) * | 2008-03-24 | 2010-11-03 | 周建 | Method for manufacturing 3-chlorin-3'-ethyl-4,4'-diaminodiphenylmethane |
| GB2478343A (en) * | 2010-03-05 | 2011-09-07 | Hexcel Composites Ltd | Asymmetric bis-aniline resin curing agent |
| CN101824664B (en) * | 2010-04-07 | 2012-05-09 | 江苏恒力化纤股份有限公司 | Method for preparing high-strength polyester industrial yarns |
| CN103407721B (en) * | 2013-07-15 | 2015-08-19 | 中国石油大学(华东) | Feedway before a kind of square pile reinforced bar skeleton seam welder |
| CN105693526A (en) * | 2016-04-01 | 2016-06-22 | 衢州信步化工科技有限公司 | Preparation method of 4,4'-methylene-bis-(3-chloro-2,6-diethylaniline) |
| CN116178205A (en) * | 2021-11-29 | 2023-05-30 | 万华化学集团股份有限公司 | Acrylonitrile modified azo diamine chain extender and preparation method thereof |
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