CN1854165A - Organic silicon modified aqueous polyurethane - Google Patents

Organic silicon modified aqueous polyurethane Download PDF

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Publication number
CN1854165A
CN1854165A CN 200510034184 CN200510034184A CN1854165A CN 1854165 A CN1854165 A CN 1854165A CN 200510034184 CN200510034184 CN 200510034184 CN 200510034184 A CN200510034184 A CN 200510034184A CN 1854165 A CN1854165 A CN 1854165A
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China
Prior art keywords
organic silicon
silicon modified
silane coupling
coupling agent
described organic
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CN 200510034184
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Chinese (zh)
Inventor
孙启龙
黄少婵
李建宗
吴伟卿
涂伟萍
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HONGCHANG ADHESIVE TAPES FACTORY GUANGZHOU CITY
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HONGCHANG ADHESIVE TAPES FACTORY GUANGZHOU CITY
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Priority to CN 200510034184 priority Critical patent/CN1854165A/en
Publication of CN1854165A publication Critical patent/CN1854165A/en
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Abstract

An organic silicon modified water-based polyurethane and its production are disclosed.The polyurethane consists of low-polymer polybasic alcohol, vulcabond and chain extender. The production is carried out by dispersing pre-polymer in water, adding ammonia silane coupling agent into system, synthesizing pre-polymer, reacting amine base with residual vulcabond base, chain extending for pre-polymer while hydrolytic condensation polymerizing, cross-linked reacting and obtaining final product. It has better water resistance and handle, less surface performance and wider temperature range. It can be used for pigment, leather finishing agent and adhesive.

Description

Organic silicon modified aqueous polyurethane
One, technical field
The invention belongs to macromolecular material and preparing technical field thereof, is a kind of Polyurethane Elastomer Materials Modified with Siloxane and preparation method thereof.
Two, background technology
The polyurethane aqueous dispersion body film forming water-intake rate that the internal emulsification method makes is big, and moisture-proof is not wiped, and it is the most effective adopting crosslinked its water tolerance of method.But for mono-component aqueous PU, interior crosslinking degree is excessive, and prepolymer viscosity is big, is unfavorable for that dispersion, emulsion are also unstable, and the water tolerance and the wet-rub resistance that will increase substantially glued membrane so just are restricted.Therefore, in keeping under the certain prerequisite of crosslinking degree, introduce organosilicon by copolymerization or blend aqueous polyurethane is carried out modification with advantages such as good low surface energy, water tolerance, resistant of high or low temperature, weathering resistance and ventilation properties, the water tolerance of glued membrane can be improved, the over-all propertieies such as feel of glued membrane can be improved again.Organic silicon modified aqueous PU generally is the segmented copolymer of polysiloxane and urethane, has good mechanical property, snappiness and surface property.The method of modification has physical blending and chemosynthesis modification (polysiloxane of terminal hydroxy group and the chain extending reaction of vulcabond; Or the end polysiloxane of amido and the chain extending reaction of vulcabond).Adopt hydroxy-silicone-oil emulsion and PU blend, because the existence of emulsifying agent, the performance of film is had certain negative impact, simultaneously because just simple physics mixing, hydroxy silicon oil moves easily.As for the chemosynthesis modification, general employing terminal hydroxy group siloxanes and other oligomer polyol and vulcabond copolymerization, but because hydroxyl directly links to each other with silicon in the hydroxy silicon oil, the reactive behavior of hydroxyl is lower, even reaction forms the Si-O-C bond structure, its hydrolytic resistance is also relatively poor, be difficult to form substantial Chemical bond.Have and report that the organosilicon oligopolymer that adopts active group to link to each other with silicon by alkyl carries out modification to PU and can make the strong organic silicon modified polyurethane aqueous dispersion of hydrolysis ability.Also have the investigator to adopt silane coupling agent to come modified aqueous polyurethane, they adopt non-response type or epoxies response type silane coupling agent that water-based PU has been carried out study on the modification.Also there is the problem of silicon migration in non-response type, and epoxide group can with the carboxyl reaction on the PU molecular chain, and cause the stability in storage of water-based PU to descend.Adopt the Ammonia silane coupling agent, amido and residual isocyanate react, hydrolyzable silica group generation hydrolytie polycondensation and make crosslinked, the chain extension of system.The polyamines base then reacts and chain extension with residual isocyanate, the silica group generation hydrolytie polycondensation of hydrolysis and make system crosslinked.In the chain extension of back, realize the interior crosslinked of system, do not influence the dispersion of prepolymer.
Three, summary of the invention
The objective of the invention is to overcome the problem that the existing market product exists, a kind of organic silicon modified aqueous polyurethane film forming material is provided, be characterized in that water-intake rate behind this material filming is low, moisture-proof wiping, heatproof wide temperature range, siliceous polyurethane material that surface energy is lower.
Another object of the present invention provides above-mentioned organic silicon modified polyurethane preparation methods.
Siliceous polyurethane material provided by the invention is that the rigid chain segment alternating copolymerization that the soft segment that is made of polyether Glycols and/or polyester diol and vulcabond and chainextender constitute forms, its characteristics be in the process of back chain extension, to have adopted can with the amino one type of silane coupling agent of isocyanic ester radical reaction.
The structure of the silane coupling agent that the present invention is used is as follows:
H 2N-(CH 2CH 2NH)nCH 2CH 2CH 2SiCH 3(OCH 3) 2
Or
H 2N-(CH 2CH 2NH)nCH 2CH 2CH 2SiCH 3(OCH 2CH 3) 2
Or
H 2N-(CH 2CH 2NH)nCH 2CH 2CH 2Si(OCH 3) 3
Or
H 2N-(CH 2CH 2NH)nCH 2CH 2CH 2Si(OCH 2CH 3) 3
Or
(NH 2CH 2CH 2CH 2Si 01.5)n
Wherein n is 1～5 integer.
The used vulcabond of the present invention is aliphatic diisocyanate, alicyclic diisocyanate or aromatic diisocyanate.As aliphatic diisocyanate, can be hexamethylene diisocyanate (HDI).As alicyclic diisocyanate can be isophorone diisocyanate (IPDI), 4,4`-dicyclohexyl vulcabond (HMDI), 1,4-cyclohexyl diisocyanate (CDI), Methylcyclohexyl diisocyanate (HTDI) etc.As aromatic diisocyanate, it can be tolylene diisocyanate (TDI), 4,4`-diphenyl diisocyanate (MDI), 1,5-naphthalene diisocyanate (NDI), xylylene diisocyanate (XDI), tetramethylxylylene diisocyanate (TMXDI) etc.
Polyether glycol that the present invention is used and polyester polyol, can enumerate: polypropylene glycol (PPG), PTMG (PTMG), polyoxyethylene glycol (PEG), the hydroxyl telechelic polyester polyvalent alcohol that forms by diprotic acid with dibasic alcohol (or compound of dibasic alcohol and trivalent alcohol) dehydration polycondensation etc., polycaprolactone polyol, its molecular weight is 400-5000.
The used wetting ability chainextender of the present invention is an anionic, as: dimethylol propionic acid (DMPA), dimethylolpropionic acid (DMBA), quadrol base ethyl sulfonic acid sodium, 1,4-butyleneglycol-2-sodium sulfonate etc.
The used small molecule chain extender of the present invention is polyvalent alcohol and polyamine.Wherein used low molecular weight polyols chainextender is at least a in the aliphatic polyol of carbon atoms 2～10, as ethylene glycol, 1, ammediol, 1,2-propylene glycol, 1,4-butyleneglycol, 1,3-butyleneglycol, 1,5-pentanediol, neopentyl glycol, 1,6-hexylene glycol, 1,8-ethohexadiol, glycol ether, quinhydrones-two (beta-hydroxyethyl) ether, TriMethylolPropane(TMP), glycerine etc.The aliphatic polyamine that wherein used low-molecular-weight polyamine chainextender is a carbon atoms 2～10 at least a, as quadrol, 1,3-propylene diamine, 1,4-butanediamine, 1,5-pentamethylene diamine, 1,6-hexanediamine, 1,8-octamethylenediamine, 1,4-cyclohexyl diamines, diethylenetriamine etc.
Organic silicon modified polyurethane material provided by the present invention replaces copolycondensation by the above-mentioned raw materials monomer and forms, and is that hard section of forming of soft section of being formed by oligomer polyol and isocyanic ester and small molecule chain extender constitutes.
The method of the above-mentioned organic silicon modified polyurethane material of preparation provided by the invention is that monomers such as vulcabond, oligomer polyol, wetting ability chainextender, small molecule chain extender are made with performed polymer dispersion method or solvent method polymerization by proportioning, it is characterized in that the starting monomer prescription (weight percent) that is adopted is:
Vulcabond: 10-50%
Oligomer polyol: 15-70%
Wetting ability chainextender 0.5-5%
Dibasic alcohol or diamine chain extenders 0-15%
Silane coupling agent 0-20%
Compared with the prior art the present invention has the following advantages:
1, owing to adopt the Ammonia silane coupling agent, can after the prepolymer water-dispersion, join in the system, can be in prepolymer synthetic or use solvent less without solvent.
2, the amido of Ammonia silane coupling agent can make the prepolymer chain extension with the residual isocyanate radical reaction, and the hydrolytie polycondensation of hydrolysable group also can make the prepolymer chain extension simultaneously, and also has crosslinking reaction to take place.Organosilyl existence and the internally crosslinked existence of formed organic silicon modified polyurethane material improve prepared organic silicon modified polyurethane material water tolerance greatly.
3, organic silicon modified polyurethane material provided by the present invention because lower surface energy of polyurethane material and good hand feeling are given in organosilyl existence, is therefore also given prepared coating of this type of polyurethane material or the better surface property of finishing agent.Because the existence of silicon, make this polyurethane material right-bonding strength of a little inorganic materials improves greatly; Also make the use temperature scope of this material wideer.
4. preparation method of the present invention is except that starting monomer, and its synthesis technique is ordinary method, and is simple, ripe, be easy to control and operation.
Embodiment
Below by embodiment the present invention is done further concrete description, but embodiments of the present invention are not limited thereto.
Embodiment one, two
(1) prescription
Title Specification Massfraction
IPDI Technical grade 37.52
N-210 Technical grade 40.00
DMPA Technical grade 6.56
NMP Technical grade 10.00
BD Technical grade 4.34
TEA Analytical pure 4.95
Amine ethylamine propyl group methyl dimethoxysilane Technical grade 6.98
H 2O Deionized water 170
Dibutyl tin laurate Technical grade 0.2
(2) synthesis technique of prepolymer
In being housed, the dry reaction still of thermometer, agitator, reflux exchanger adds IPDI, N-210 and dibutyl tin dilaurate, being warming up to 60-100 ℃ reacts to isocyanate group content and reaches theoretical value, adding the DMPA that is dissolved among the NMP continues about reaction 1h, add again BD react to isocyanate group content be 2.7%, be cooled to about 40 ℃, add the triethylamine neutralization and obtain prepolymer, whole process adds solvent adjustment viscosity as required.
(3) preparation of water dispersion
Implement example one: prepolymer is poured in the deionized water, after high speed shear is disperseed, added about amine ethylamine propyl group methyl dimethoxysilane reaction 1h discharging again.
Implement example two: deionized water is poured in the prepolymer, after high-speed stirring is disperseed, added about amine ethylamine propyl group methyl dimethoxysilane reaction 1h discharging again.
Implement example three:
(1) prescription
Title Specification Weight fraction
IPDI Technical grade 40.00
N-220 Technical grade 80.00
DMPA Technical grade 7.11
NMP Technical grade 15.00
BD Technical grade 3.15
TEA Analytical pure 5.09
Amine ethylamine propyl trimethoxy silicane Technical grade 9.34
H 2O Deionized water 260
Dibutyl tin laurate Technical grade 0.20
(2) synthesis technique of prepolymer
With implementing example one, two, just N-210 is changed to N-220.
(3) preparation of water dispersion
Deionized water is poured in the prepolymer, after high-speed stirring is disperseed, added about amine ethylamine propyl trimethoxy silicane reaction 1h discharging again.
Implement example four:
(1) prescription
Title Specification Weight fraction
IPDI Technical grade 35.52
Polycaprolactone glycol Technical grade, M w＝1000 40.00
DMBA Technical grade 4.67
NMP Technical grade 10.00
BD Technical grade 3.78
TEA Analytical pure 3.25
Amine ethylamine propyl group amine propyl-triethoxysilicane Technical grade 12.85
H 2O Deionized water 170
Dibutyl tin laurate Technical grade 0.20
(2) synthesis technique of prepolymer
With implementing example one, two, just N-210 is changed to the polycaprolactone dibasic alcohol.
(3) preparation of water dispersion
Deionized water is poured in the prepolymer, after high-speed stirring is disperseed, added about amine ethylamine propyl group amine propyl-triethoxysilicane reaction 1h discharging again.
The technical indicator of the present invention's series organic silicon modified polyurethane resin dispersion:
Solids content 20-30％
The pH value 7.0-9.0
Viscosity 100～400cps(25±1℃)
Saturated water absorption ＜10％
Breaking tenacity (MPa) ＞5
Elongation at break (%) ＞500

Claims (10)

1. organic silicon modified aqueous polyurethane dispersion, by following method preparation:
A. oligopolymer dibasic alcohol, polyisocyanates, acid dihydroxy compound and small molecule chain extender make prepolymer.
B. the prepolymer that obtains with A in.
C. add the water dispersion that water forms prepolymer.
D. add can with the silane coupling agent chain extension of isocyanate reaction.
2. the described organic silicon modified polyurethane material of claim 1 is characterized in that adopting silane coupling agent to carry out chain extension in the chain extension process of back.
3. claim 1 or 2 described organic silicon modified polyurethane materials, dosage of silane coupling agent accounts for the 0-20% of total solids.
4. claim 1 or 2 described organic silicon modified polyurethane materials, the structure of silane coupling agent is amino one type of silane coupling agent.
5. claim 1 or 2 described organic silicon modified polyurethane materials, amino one type of silane coupling agent can be primary amine, secondary amine, urea groups, polyamines, its structure is as follows: the structure of the silane coupling agent that the present invention is used is as follows:
H 2N-(CH 2CH 2NH)nCH 2CH 2CH 2SiCH 3(OCH 3) 2
Or
H 2N-(CH 2CH 2NH)nCH 2CH 2CH 2SiCH 3(OCH 2CH 3) 2
Or
H 2N-(CH 2CH 2NH)nCH 2CH 2CH 2Si(OCH 3) 3
Or
H 2N-(CH 2CH 2NH)nCH 2CH 2CH 2Si(OCH 2CH 3) 3
Or
(NH 2CH 2CH 2CH 2Si0 1.5)n
Wherein n is 1～5 integer.The molecular weight of used silane coupling agent is 170-290
6. the described organic silicon modified polyurethane material of claim 1 adopts polyester or polyether Glycols in the preparation of prepolymer.
7. the described organic silicon modified polyurethane material of claim 1, the residual isocyanate content of prepolymer is 10%-5.0%.
8. the described organic silicon modified polyurethane material of claim 1 can be used as the coating filmogen.
9. the described organic silicon modified polyurethane material of claim 1 can be used as tackiness agent.
10. the described organic silicon modified polyurethane material of claim 1 can be used as fabric finishing agent.
CN 200510034184 2005-04-20 2005-04-20 Organic silicon modified aqueous polyurethane Pending CN1854165A (en)

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CN103382245A (en) * 2012-05-03 2013-11-06 高明志 Preparation method for organosilicon-modified crosslinking polyurethane emulsion
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