CN1821221A - Poly methylene poly phenyl poly isocyanate with anti-scaling property and preparing method - Google Patents
Poly methylene poly phenyl poly isocyanate with anti-scaling property and preparing method Download PDFInfo
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- CN1821221A CN1821221A CN 200610044493 CN200610044493A CN1821221A CN 1821221 A CN1821221 A CN 1821221A CN 200610044493 CN200610044493 CN 200610044493 CN 200610044493 A CN200610044493 A CN 200610044493A CN 1821221 A CN1821221 A CN 1821221A
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Abstract
The present invention discloses polymethylene polyphenyl polyisocyanate possessing anti-scaling property, and features the polymethylene polyphenyl polyisocyanate possessing anti-scaling property is prepared with polymethylene polyphenyl polyisocyanate in 90-99.9 wt% and anti-scaling agent in 0.1-10 wt% and through mixing at 20-100deg.c. The present invention has obviously raised anti-scaling property.A
Description
(1) technical field: the present invention relates to a kind of poly methylene poly phenyl poly isocyanate and preparation method thereof with good anti-scaling property.
(2) background technology: urethane is one of the world six synthetic materials of having development prospect greatly, have functions such as wear-resisting, low temperature resistant, oil resistant and anti-ozone, obtain fast development in China in recent years, be widely used in fields such as porous plastics, elastomerics, tackiness agent, coating and fiber.
Isocyanic ester is one of urethane synthetic main raw material, many kinds is arranged in industrial practical application.Wherein the isocyanic ester of consumption maximum mainly is tolylene diisocyanate (TDI), diphenylmethanediisocyanate (MDI), and poly methylene poly phenyl poly isocyanate (PAPI).
PAPI and water reaction at first generate unsettled carboxylamine, resolve into carbonic acid gas and amine by carboxylamine then.Excessive isocyanic ester will continue and the amine reaction, generates to replace urea.
Because RNH
2Faster than water with the reaction of RNCO, once above-mentioned reaction can be write as:
Under the Working environment of humidity, as the summer of southern china, the phenomenon of PAPI skinning, caking can appear during some are used.The most obvious in the chromatic steel sandwich plate field.Because PAPI easy moisture absorption in the applying glue process condenses into piece, blocks spray Jiao Kou, influence applying glue, so under the wet weather situation, and China's southern area, continuity, the production operation of applying glue there is very big influence.
(3) summary of the invention: the objective of the invention is to overcome the deficiency of above-mentioned prior art and provide a kind of nonhygroscopic in the applying glue process, a kind of poly methylene poly phenyl poly isocyanate of skinning, caking and preparation method thereof do not occur with good anti-scaling property.
Purpose of the present invention can reach by following measure: have the poly methylene poly phenyl poly isocyanate of anti-scaling property, it is characterized in that it adds 0.1%～10% resistive connection skin additive by 90～99.9% poly methylene poly phenyl poly isocyanates and makes.
In order further to realize purpose of the present invention, the content of poly methylene poly phenyl poly isocyanate is 95%～99%, and resistive connection skin additive level is 1-5%.
In order further to realize purpose of the present invention, described resistive connection skin additive is synthetic by isocyanic ester and polyol reaction.
In order further to realize purpose of the present invention, described isocyanic ester is a fat group, cyclic aliphatic, aromatic series and heterocycle polyisocyanates, contains a kind of in the polyisocyanates of carbodiimide groups, carbamate groups, allophanate groups, isocyanurate group, biuret group and urea groups or several mixture arbitrarily.
In order further to realize purpose of the present invention, described aromatic polyisocyanate is 2,4-hexahydro-tolylene diisocyanate; 2,6-hexahydro-tolylene diisocyanate; 1, the 3-phenylene vulcabond; 1, the 4-phenylene vulcabond; 2,4 toluene diisocyanate (2,4-TDI); 2, and the 6-tolylene diisocyanate (2,6-TDI); Ditan-2,4 vulcabond (2,4-MDI); Ditan-4,4 ' vulcabond (4,4 '-MDI); Naphthalene-1, the 5-vulcabond; Triphenyl methane-4,4 ', 4 "-triisocyanate; A kind of or any several mixture in the poly methylene poly phenyl poly isocyanate.
In order further to realize purpose of the present invention, described aliphatic polyisocyanate is an ethylidene diisocyanate; 1, the 4-tetramethylene diisocyanate; Hexamethylene diisocyanate (HDI); 2,4,4 '-trimethylammonium-1,6-hexamethylene diisocyanate and 1, a kind of or any several mixture in the 12-dodecane vulcabond.
In order further to realize purpose of the present invention, described cycloaliphatic polyisocyanate is a hexanaphthene-1, the 4-vulcabond; Tetramethylene-1, the 3-vulcabond; Hexanaphthene-1, the 3-vulcabond; 2,4 '-dicyclohexyl methane diisocyanate; 4, a kind of or any several mixture in 4 '-dicyclohexyl methane diisocyanate.
In order further to realize purpose of the present invention, described isocyanic ester is an ethylidene diisocyanate; 1,4-tetramethylene two different ester acid esters; Hexamethylene diisocyanate (HDI); 2,4,4-trimethylammonium-1,6-hexamethylene diisocyanate; 1,12-dodecane vulcabond; Tetramethylene-1, the 3-vulcabond; Hexanaphthene-1, the 3-vulcabond; 2,4-chlordene tolylene diisocyanate; 2,6-chlordene tolylene diisocyanate; 2,4 '-dicyclohexyl hexyl methane diisocyanate; 4,4 '-dicyclohexyl methane diisocyanate; 1, the 3-phenylene vulcabond; 1, the 4-phenylene vulcabond; 2,4 toluene diisocyanate (TDI); 2, the 6-tolylene diisocyanate; Ditan-2,4 '-vulcabond; Ditan-4,4 '-vulcabond (MDI); Naphthalene-1, the 5-vulcabond; Triphenyl methane-4,4 ', 4 " triisocyanates; A kind of or any several mixture in the poly methylene poly phenyl poly isocyanate.
In order to realize that further purpose of the present invention, described polyvalent alcohol are a kind of or any several mixture in polyether glycol, the polyester polyol.
In order further to realize purpose of the present invention, described polyether glycol is polyethylene oxide (PE); Poly(propylene oxide) (PP); A kind of or any several mixture in the ethylene oxide-capped poly(propylene oxide).
In order further to realize purpose of the present invention, described polyether glycol functionality is 2～6, and molecular weight is 300～10000.
In order further to realize purpose of the present invention, described polyester polyol functionality is 2, and molecular weight is 100～10000.
Preparation method with poly methylene poly phenyl poly isocyanate of anti-scaling property, it is characterized in that it is that 0.1%～10% anti-skinning agent is joined in 90～99.9% poly methylene poly phenyl poly isocyanates, stir, charge temperature is at 20～100 ℃.Preferred temperature is 30～50 ℃.
In order further to realize purpose of the present invention, described anti-skinning agent is made by following method: polyvalent alcohol is added the isocyanic ester that measures, and design NCO content is 23%～29%, keeps temperature of reaction at 40～100 ℃, preferred temperature is 60～85 ℃, and the reaction times is 2～5 hours.
In order further to realize purpose of the present invention, described anti-skinning agent is made by following method: at first polyvalent alcohol is added the isocyanic ester that measures, design NCO content is 10%～21%, and design keeps temperature of reaction at 40～100 ℃, and preferred temperature is 60～85 ℃, reaction times is 2～5 hours, add quantitative isocyanic ester afterwards again, design NCO content is 23%～29%, and design keeps temperature of reaction at 10～80 ℃, preferred temperature is 20～50 ℃, mixes the back discharging.
The present invention can produce following positively effect compared with the prior art:
The preparation process of poly methylene poly phenyl poly isocyanate of the present invention is to add an amount of resistive connection skin additive (B) in (A) poly methylene poly phenyl poly isocyanate (PAPI), thereby improves the anti-hygroscopic property of PAPI.
At first, the present invention relates to a kind of anti-skinning agent, this kind anti-skinning agent is a kind of polyurethane prepolymer.This prepolymer is the reaction product of isocyanic ester and polyvalent alcohol.
Secondly, the present invention relates to the add-on and the adding method of this kind anti-skinning agent.Wherein the amount ranges of additive B is 0.1%～10%, and optimum range is 1～5%.Adopt the poly methylene poly phenyl poly isocyanate anti-scaling property of described method preparation obviously to improve.
(4) embodiment: following preferred forms of the present invention is elaborated: raw material:
Isocyanic ester A:4,4 '-ditan-vulcabond
NCO content is 33.6% (the magnificent urethane in WANNATEMDI-100 Yantai ten thousand stock company produces)
Isocyanic ester B: poly methylene poly phenyl poly isocyanate
NCO content is 31% (the magnificent urethane in WANNATEPM-200 Yantai ten thousand stock company produces)
Isocyanic ester C: tolylene diisocyanate
NCO content is 48% (production of Cangzhou, TDI-80/20 Hebei bigization limited-liability company)
Isocyanic ester D: carbodiimide modification 4,4 '-ditan-vulcabond NCO content are 29.3% (the magnificent urethane in WANNATE1630 Yantai ten thousand stock company produces)
Isocyanic ester E: isophorone diisocyanate
NCO content is 37.8%
Polyvalent alcohol A: the polyether glycol of propylene oxide base, functionality are 2, and the OH value is 102mgKOH/g, (production of PPG1000 Jiangsu Zhongshang Chemical Co., Ltd.)
Polyvalent alcohol B: the polyether glycol of propylene oxide base, functionality are 2, and the OH value is 56mgKOH/g, (production of N-220 Jiangsu Zhongshang Chemical Co., Ltd.)
Polyvalent alcohol C: the polyether glycol of propylene oxide and Oxyranyle, functionality are 3, and the OH value is 28mgKOH/g, (production of ZS-T280 Jiangsu Zhongshang Chemical Co., Ltd.)
Polyvalent alcohol D: the polyether glycol of propylene oxide and Oxyranyle, functionality are 3, and the OH value is 32mgKOH/g, (production of ZS-T320 Jiangsu Zhongshang Chemical Co., Ltd.)
Polyol E: the polyether glycol of Oxyranyle, functionality are 2, and the OH value is 102mgKOH/g, (production of PEG-1000 Jiangsu Zhongshang Chemical Co., Ltd.)
Below for preparing the embodiment of anti-skinning agent:
Embodiment 1:
It is standby after round-bottomed flask and agitator be preheated to 60 ℃, 200 gram isocyanic ester A and 615 gram isocyanic ester B are placed the round-bottomed flask of being furnished with stirring rake, stirring bearing, stir shaft, nitrogen inlet, thermopair, temperature controller, heating mantles and stopper of preheating, thereby 60 ℃ 185 gram polyvalent alcohol A are added flask formation reaction mixture, in 60 minutes, make temperature of reaction rise to 75 ℃ from 60 ℃, thereby under 75 ℃, make described reaction mixture reaction generate anti-skinning agent I in 2-3 hour.
Embodiment 2:
It is standby after round-bottomed flask and agitator be preheated to 60 ℃, 200 gram isocyanic ester A and 615 gram isocyanic ester B are placed the round-bottomed flask of being furnished with stirring rake, stirring bearing, stir shaft, nitrogen inlet, thermopair, temperature controller, heating mantles and stopper of preheating, thereby 60 ℃ 225 gram polyvalent alcohol B are added flask formation reaction mixture, in 60 minutes, make temperature of reaction rise to 75 ℃ from 60 ℃, thereby under 75 ℃, make described reaction mixture reaction generate anti-skinning agent II in 2-3 hour.
Embodiment 3:
Synthesis step is identical with embodiment 1, change 60 ℃ polyvalent alcohol A into polyvalent alcohol C, consumption is 220 grams, thereby adds flask formation reaction mixture, in 60 minutes, make temperature of reaction rise to 75 ℃ from 60 ℃, thereby under 75 ℃, make described reaction mixture reaction generate anti-skinning agent III in 2-3 hour.
Embodiment 4:
Synthesis step is identical with embodiment 1, change 60 ℃ polyvalent alcohol A into polyvalent alcohol D, consumption is 220 grams, thereby adds flask formation reaction mixture, in 60 minutes, make temperature of reaction rise to 75 ℃ from 60 ℃, thereby under 75 ℃, make described reaction mixture reaction generate anti-skinning agent IV in 2-3 hour.
Embodiment 5:
Synthesis step is identical with embodiment 1, change 60 ℃ polyvalent alcohol A into polyol E, consumption is 220 grams, thereby adds flask formation reaction mixture, in 60 minutes, make temperature of reaction rise to 75 ℃ from 60 ℃, thereby under 75 ℃, make described reaction mixture reaction generate anti-skinning agent V in 2-3 hour.
Embodiment 6:
With the anti-skinning agent I～V that obtains among the embodiment 1～5, place the round-bottomed flask of being furnished with stirring rake, stirring bearing, stir shaft, nitrogen inlet, thermopair, temperature controller, heating mantles and stopper of preheating with 5 part of 198 isocyanic ester B that restrains 50 ℃ respectively, 50 ℃ 2 gram anti-skinning agents are added in the poly methylene poly phenyl poly isocyanates.Stirred 1～2 hour, and made its thorough mixing, be cooled to the room temperature discharging.Anti-skinning agent content is 1.0%.The isocyanic ester B sample that adds anti-skinning agent is poured into the scale test tube of 25ml respectively, placing temperature is 30 ℃, and relative humidity is to investigate the resistive connection skin in 60% the climatic chamber, with the isocyanic ester B that does not add anti-skinning agent sample as a comparison, observed once every 24 hours, the result is as shown in table 1.
The resistive connection skin experiment of table 1 contrast poly methylene poly phenyl poly isocyanate
| Anti-skinning agent | 1 day | 2 days | 3 days | 4 days | 5 days | 6 days | 7 days |
| Do not have | Wall built-up | Skinning | Skinning does not flow | Skinning does not flow | Skinning does not flow | Skinning does not flow | Skinning does not flow |
| Anti-skinning agent I | Not wall built-up, not skinning | Not wall built-up, not skinning | Not wall built-up, not skinning | Not wall built-up, not skinning | Not wall built-up, not skinning | Wall built-up | Wall built-up |
| Anti-skinning agent II | Not wall built-up, not skinning | Not wall built-up, not skinning | Not wall built-up, not skinning | Not wall built-up, not skinning | Not wall built-up, not skinning | Not wall built-up, not skinning | Not wall built-up, not skinning |
| Anti-skinning agent III | Not wall built-up, not skinning | Not wall built-up, not skinning | Not wall built-up, not skinning | Not wall built-up, not skinning | Not wall built-up, not skinning | Wall built-up | Wall built-up |
| Anti-skinning agent IV | Not wall built-up, not skinning | Not wall built-up, not skinning | Not wall built-up, not skinning | Wall built-up | Wall built-up | Wall built-up | Skinning |
| Anti-skinning agent V | Not wall built-up, not skinning | Not wall built-up, not skinning | Not wall built-up, not skinning | Wall built-up | Wall built-up | Skinning | Skinning |
Can get preferred anti-skinning agent II by last table result
Embodiment 7:
It is standby after round-bottomed flask and agitator be preheated to 60 ℃, 131 gram isocyanic ester C are placed the round-bottomed flask of being furnished with stirring rake, stirring bearing, stir shaft, nitrogen inlet, thermopair, temperature controller, heating mantles and stopper of preheating, thereby 60 ℃ 225 gram polyvalent alcohol B are added flask formation reaction mixture, in 60 minutes, make temperature of reaction rise to 75 ℃ from 60 ℃, thereby under 75 ℃, make described reaction mixture reaction generate anti-skinning agent VI in 2-3 hour.
Embodiment 8:
Step is identical with embodiment 7, changes 131 gram isocyanic ester C into 215 gram isocyanic ester D.
In 60 minutes, make temperature of reaction rise to 75 ℃ from 60 ℃, thereby under 75 ℃, make described reaction mixture reaction generate anti-skinning agent VII in 2-3 hour.
Embodiment 9:
Step is identical with embodiment 7, changes 131 gram isocyanic ester C into 167 gram isocyanic ester E.
In 60 minutes, make temperature of reaction rise to 75 ℃ from 60 ℃, thereby under 75 ℃, make described reaction mixture reaction generate anti-skinning agent VIII in 2-3 hour.
Embodiment 10:
With anti-skinning agent II, the VI～VIII that obtains among the embodiment 2,7～9, place the round-bottomed flask of being furnished with stirring rake, stirring bearing, stir shaft, nitrogen inlet, thermopair, temperature controller, heating mantles and stopper of preheating with 4 part of 198 isocyanic ester B that restrains 50 ℃ respectively, 50 ℃ 2 gram anti-skinning agents are added in the poly methylene poly phenyl poly isocyanates.Stirred 1～2 hour, and made its thorough mixing, be cooled to the room temperature discharging.Anti-skinning agent content is 1.0%.The isocyanic ester B sample that adds anti-skinning agent is poured into the scale test tube of 25ml respectively, placing temperature is 30 ℃, and relative humidity is to investigate the resistive connection skin in 60% the climatic chamber, with the isocyanic ester B that does not add anti-skinning agent sample as a comparison, observed once every 24 hours, the result is as shown in table 2.
Table 2 contrast anti-skinning agent II VI VII VIII performance
| Anti-skinning agent | 1 day | 2 days | 3 days | 4 days | 5 days | 6 days | 7 days |
| Do not have | Wall built-up | Skinning | Skinning does not flow | Skinning does not flow | Skinning does not flow | Skinning does not flow | Skinning does not flow |
| Anti-skinning agent II | Not wall built-up, not skinning | Not wall built-up, not skinning | Not wall built-up, not skinning | Not wall built-up, not skinning | Not wall built-up, not skinning | Not wall built-up, not skinning | Not wall built-up, not skinning |
| Anti-skinning agent VI | Not wall built-up, not skinning | Not wall built-up, not skinning | Not wall built-up, not skinning | Not wall built-up, not skinning | Not wall built-up, not skinning | Not wall built-up, not skinning | Wall built-up |
| Anti-skinning agent VII | Not wall built-up, not skinning | Not wall built-up, not skinning | Not wall built-up, not skinning | Not wall built-up, not skinning | Wall built-up | Wall built-up | Skinning |
| Anti-skinning agent VIII | Not wall built-up, not skinning | Not wall built-up, not skinning | Not wall built-up, not skinning | Not wall built-up, not skinning | Not wall built-up, not skinning | Wall built-up | Wall built-up |
The embodiment that has the poly methylene poly phenyl poly isocyanate of anti-scaling property below for preparation:
Embodiment 11:
It is standby after round-bottomed flask and agitator be preheated to 50 ℃, 199 gram isocyanic ester B are placed the round-bottomed flask of being furnished with stirring rake, stirring bearing, stir shaft, nitrogen inlet, thermopair, temperature controller, heating mantles and stopper of preheating, 50 ℃ 1 gram anti-skinning agent II are added among the isocyanic ester B.Stirred 1～2 hour, and made its thorough mixing, be cooled to the room temperature discharging.Anti-skinning agent content is 0.5%.
Embodiment 12:
It is standby after round-bottomed flask and agitator be preheated to 50 ℃.198 gram isocyanic ester B are placed the round-bottomed flask of being furnished with stirring rake, stirring bearing, stir shaft, nitrogen inlet, thermopair, temperature controller, heating mantles and stopper of preheating.50 ℃ 2 gram anti-skinning agent II are added among the isocyanic ester B.Stirred 1～2 hour, and made its thorough mixing, be cooled to the room temperature discharging.Anti-skinning agent content is 1%.
Embodiment 13:
It is standby after round-bottomed flask and agitator be preheated to 50 ℃.194 gram isocyanic ester B are placed the round-bottomed flask of being furnished with stirring rake, stirring bearing, stir shaft, nitrogen inlet, thermopair, temperature controller, heating mantles and stopper of preheating.50 ℃ 4 gram anti-skinning agent II are added among the isocyanic ester B.Stirred 1～2 hour, and made its thorough mixing, be cooled to the room temperature discharging.Anti-skinning agent content is 2%.
Embodiment 14:
The sample that obtains among the embodiment 11～13 is poured into the scale test tube of 25ml respectively, placing temperature is 30 ℃, relative humidity is to investigate the resistive connection skin in 60% the climatic chamber, with the isocyanic ester B that does not add anti-skinning agent sample as a comparison, observed once every 24 hours, the result is as shown in table 3, and the poly methylene poly phenyl poly isocyanate anti-scaling property that adds anti-skinning agent obviously improves.
The resistive connection skin experiment of the different anti-skinning agent consumptions of table 3
| Anti-skinning agent II consumption | 1 day | 2 days | 3 days | 4 days | 5 days | 6 days | 7 days |
| 0 | Wall built-up | Skinning | Skinning does not flow | Skinning does not flow | Skinning does not flow | ||
| 0.5％ | Not wall built-up, not skinning | Not wall built-up, not skinning | Not wall built-up, not skinning | Not wall built-up, not skinning | Wall built-up | Wall built-up | Skinning |
| 1％ | Not wall built-up, not skinning | Not wall built-up, not skinning | Not wall built-up, not skinning | Not wall built-up, not skinning | Not wall built-up, not skinning | Not wall built-up, not skinning | Not wall built-up, not skinning |
| 2％ | Not wall built-up, not skinning | Not wall built-up, not skinning | Not wall built-up, not skinning | Not wall built-up, not skinning | Not wall built-up, not skinning | Not wall built-up, not skinning | Not wall built-up, not skinning |
Claims (11)
1, the poly methylene poly phenyl poly isocyanate that has anti-scaling property is characterized in that it adds 0.1%～10% resistive connection skin additive by 90～99.9% poly methylene poly phenyl poly isocyanates and makes.
2, the poly methylene poly phenyl poly isocyanate with anti-scaling property according to claim 1 is characterized in that described resistive connection skin additive is synthetic by isocyanic ester and polyol reaction.
3, the poly methylene poly phenyl poly isocyanate with anti-scaling property according to claim 2, it is characterized in that described isocyanic ester is fat group, cyclic aliphatic, aromatic series and heterocycle polyisocyanates, contain a kind of in the polyisocyanates of carbodiimide groups, carbamate groups, allophanate groups, isocyanurate group, biuret group and urea groups or several mixture arbitrarily.
4, the poly methylene poly phenyl poly isocyanate with anti-scaling property according to claim 3 is characterized in that described aromatic polyisocyanate is 2,4-hexahydro-tolylene diisocyanate; 2,6-hexahydro-tolylene diisocyanate; 1, the 3-phenylene vulcabond; 1, the 4-phenylene vulcabond; 2,4 toluene diisocyanate; 2, the 6-tolylene diisocyanate; Ditan-2, the 4-vulcabond; Ditan-4, the 4-vulcabond; Naphthalene-1, the 5-vulcabond; Triphenyl methane-4,4 ', 4 "-triisocyanate; A kind of or any several mixture in the poly methylene poly phenyl poly isocyanate.
5, the poly methylene poly phenyl poly isocyanate with anti-scaling property according to claim 2 is characterized in that described polyvalent alcohol is a kind of or any several mixture in polyether glycol, the polyester polyol.
6, the poly methylene poly phenyl poly isocyanate with anti-scaling property according to claim 2 is characterized in that described polyether glycol is a polyethylene oxide; Poly(propylene oxide); A kind of or any several mixture in the ethylene oxide-capped poly(propylene oxide).
7, according to claim 5 or 6 described poly methylene poly phenyl poly isocyanates with anti-scaling property, it is characterized in that described polyether glycol functionality is 2～6, molecular weight is 300～10000.
8, the poly methylene poly phenyl poly isocyanate with anti-scaling property according to claim 5 is characterized in that described polyester polyol functionality is 2, and molecular weight is 100～10000.
9, the described preparation method of claim 1 with poly methylene poly phenyl poly isocyanate of anti-scaling property, it is characterized in that it is that 0.1%～10% anti-skinning agent is joined in 90～99.9% poly methylene poly phenyl poly isocyanates, stir, charge temperature is at 20～100 ℃.
10, the preparation method with poly methylene poly phenyl poly isocyanate of anti-scaling property according to claim 9, it is characterized in that described anti-skinning agent is made by following method: polyvalent alcohol is added the isocyanic ester that measures, design NCO content is 23%～29%, keep temperature of reaction at 40～100 ℃, the reaction times is 2～5 hours.
11, the preparation method with poly methylene poly phenyl poly isocyanate of anti-scaling property according to claim 10, it is characterized in that described anti-skinning agent is made by following method: at first polyvalent alcohol is added the isocyanic ester that measures, design NCO content is 10%～21%, design keeps temperature of reaction at 40～100 ℃, reaction times is 2～5 hours, add quantitative isocyanic ester afterwards again, design NCO content is 23%～29%, design keeps temperature of reaction at 10～80 ℃, mixes the back discharging.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101531753B (en) * | 2009-04-13 | 2011-07-06 | 北京科聚化工新材料有限公司 | MDI-group isocyanate composition and soft mould foamed plastic |
| WO2015062960A1 (en) * | 2013-10-28 | 2015-05-07 | Basf Se | Low density polyurethane microcellular elastomer |
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| US11738487B2 (en) | 2021-01-22 | 2023-08-29 | Covestro Llc | Processes for making molded flexible foams and flexible foams produced thereby |
| US20220235168A1 (en) * | 2021-01-22 | 2022-07-28 | Covestro Llc | Processes for making molded flexible foams and flexible foams produced thereby |
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| CA2214311A1 (en) * | 1996-09-06 | 1998-03-06 | Air Products And Chemicals, Inc. | Hot melt adhesives comprising low free monomer, low oligomer isocyanate prepolymers |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101531753B (en) * | 2009-04-13 | 2011-07-06 | 北京科聚化工新材料有限公司 | MDI-group isocyanate composition and soft mould foamed plastic |
| WO2015062960A1 (en) * | 2013-10-28 | 2015-05-07 | Basf Se | Low density polyurethane microcellular elastomer |
| CN105683236A (en) * | 2013-10-28 | 2016-06-15 | 巴斯夫欧洲公司 | Low density polyurethane microcellular elastomer |
| CN105683236B (en) * | 2013-10-28 | 2018-11-23 | 巴斯夫欧洲公司 | Low density polyurethane micropore elastomer |
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