CN103484008A - Organic silicon modified water-based polyurethane paint and preparation method - Google Patents
Organic silicon modified water-based polyurethane paint and preparation method Download PDFInfo
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Abstract
The invention relates to organic silicon modified water-based polyurethane and a preparation method thereof, and particularly relates to water-based polyurethane paint containing organic silicon on the main chain and a preparation method thereof. The paint comprises the following components: 30-40 parts of polyisocyanate, 30-40 parts of polyether glycol, 3-10 parts of hydrophilic chain extender, 2-10 parts of chain extender, 1-3 parts of crosslinking agent and 3-10 parts of neutralizing agent. The preparation method comprises the steps of prepolymer synthesis, prepolymer neutralization, chain extension, emulsification and the like. According to the invention, a silicon-oxygen bond (-Si-O-Si-) is introduced onto the molecular main chain of the prepared organic silicon modified water-based polyurethane paint; since the bond length of the silicon-oxygen bond is much longer than that of a carbon-to-carbon bond (-C-C-), the flexibility of the chain is greatly improved; meanwhile, the used polyether glycol is a soft segment; the flexibility of the polyurethane can be well improved, thus greatly reducing the modulus of the polyurethane; and the organic silicon modified water-based polyurethane has great application prospects in textile, leather, buildings and certain special industries.
Description
Technical field
The present invention relates to a kind of aqueous polyurethane coating and preparation method thereof, particularly on a kind of main chain, contain organosilyl aqueous polyurethane coating and preparation method thereof.
Background technology
That urethane (PU) material has is wear-resisting, anti tear, characteristics that anti-flexibility is good.The structure of urethane forms with the mode of hard section with block, grafting or interpenetrating(polymer)networks by soft section.Soft section is generally polyethers or polyester, gives urethane with flexibility and toughness, and hard section is generally the polycondensate of polyisocyanates and micromolecular dibasic alcohol or diamine, gives urethane with strength and stiffness.By regulating structure, length and the distribution of soft section or hard section, relative proportion and change the mode such as relative molecular mass, can in very large range change the performance of urethane, in aspect extensive application such as rubber, plastics, tackiness agent and coating.
Organosilicon, because its unique chemical structure has a series of excellent properties, as good heat-resisting, weather-proof, electrical insulation capability and hydrophobic nature etc., the superiority with the urethane of organic-silicon-modified preparation with both.But the solubility parameters of polysiloxane and urethane differs larger, the method for general simple blend, in-situ polymerization and formation inierpeneirating network structure is not very satisfactory.
The modification that organosilicon is used for to urethane is an important channel of improving urethane and organosilicon material single-material performance deficiency.Method of modifying can be both by organosilicon and base polyurethane prepolymer for use as copolymerization, can be also directly to add urethane to using organosilicon as properties-correcting agent.Along with going deep into of research, the application of organic silicon modified polyurethane is increasingly extensive, as be used as coating, tackiness agent, sealing agent, hide finishes, fabric finishing agent etc.
Many scholars are studied organosilicon modified polyester, and have obtained certain achievement.The minister in ancient times rather waits that (minister in ancient times is peaceful, Zhang Xiaolei, Yu is from just waiting. the preparation and property research of organosilicon modification by copolymerization aqueous polyurethane PU-SI. and Chinese leather, 2001,30 (17): 10) take polyester polyol, silicone oligomer, polyisocyanates is main raw material, makes the organic silicon modified polyurethane emulsion.This good emulsion stability, water tolerance improves, and it is had to good over-all properties as top layer coating.(the Tian Jun such as Tian Jun, Xue Qunji. the research of hydroxyl-terminated injecting two methyl siloxane/castor oil modified polyurethane segmented copolymer. polymer material science and engineering, 1998,14 (6): 38) by with hydroxyl endblocked polydimethylsiloxane, alcoholysis castor oil modified polyurethane performed polymer being carried out to blending and modifying, its curing speed is accelerated, and its sticking power of filming, hardness, thermotolerance also improve.
Yet, the organic silicon modified polyurethane application of paints, in fabric and wrapping material, is improved to the research of its tear resistance aspect seldom.Therefore, exploitation organic silicon modified polyurethane coating, for the modification of wear-resisting, corrosion-resistant, the tearing toughness of fabric and wrapping material, will have important theory significance and using value.Organic silicon modified polyurethane coating has huge prospect in textiles, leather, building and some special industry.
Summary of the invention
The purpose of this invention is to provide a kind of organic silicon modified aqueous polyurethane coating and preparation method thereof, particularly on a kind of main chain, contain organosilyl aqueous polyurethane coating and preparation method thereof.Organic silicon modified aqueous polyurethane coating of the present invention has been introduced siloxane bond (Si-O-Si-) on the molecular backbone chain of polymkeric substance, can be good at improving the kindliness of urethane, significantly reduces the modulus of urethane.Simultaneously, by introduce siloxane bond (Si-O-Si-) on polyurethane backbone, it is carried out to modification, can fundamentally solve the problem of urethane kindliness.
Purpose of the present invention can be achieved through the following technical solutions:
A kind of organic silicon modified aqueous polyurethane coating, this organic silicon modified aqueous polyurethane coating comprises following feed composition, calculates according to the mass fraction:
Polyisocyanates: 30～40;
Polyether glycol: 30～40;
Wetting ability chainextender: 3～10;
Chainextender: 2～10;
Linking agent: 1～3;
Neutralizing agent: 3～10.
The mixture that described polyisocyanates is hydrogenated diphenyl methane diisocyanate and two trimethylene (tetramethyl-silica alkane) vulcabond, both weight ratios are 0.7～0.5:0.3～0.5.
The structural formula of described hydrogenated diphenyl methane diisocyanate is as follows:
The structural formula of described pair of trimethylene (tetramethyl-silica alkane) vulcabond is as follows:
Described polyether glycol is polytetrahydrofuran, and its molecular weight is 3000～6000.
Described hydrophilic chain extender is dimethylol propionic acid, dimethylolpropionic acid or tartrate.
Described chainextender is 1,6-hexylene glycol.
Described linking agent is TriMethylolPropane(TMP), trolamine or triethylamine.
Described neutralizing agent is triethylamine, Trimethylamine 99 or N, the N-dimethylethanolamine.
A kind of preparation method of organic silicon modified aqueous polyurethane coating, the method comprises the following steps:
Step 1: the preparation of two trimethylenes (tetramethyl-silica alkane) vulcabond
By tetramethyl--bis-(γ-aminopropyl) sily oxide and chlorobenzene, be the ratio wiring solution-forming of 0.5～0.6:0.5～0.4 by weight, then the solution for preparing at the uniform velocity is added drop-wise to excessive 4 by the speed of per minute 10～12ml, 4 '-diphenylmethanediisocyanate in, reaction under 175～180 ℃, remove chlorobenzene under reduced pressure, then obtain two trimethylene (tetramethyl-silica alkane) vulcabond through separating-purifying.
Step 2): get the raw materials ready
Calculate and prepared burden by following feed composition and mass fraction:
Polyisocyanates: 30～40;
Polyether glycol: 30～40;
Wetting ability chainextender: 3～10;
Chainextender: 2～10;
Linking agent: 1～3;
Neutralizing agent: 3～10.
Step 3): prepolymer is synthetic
Polyisocyanates and polyether glycol are added in reactor, and temperature is controlled at 70～90 ℃, and under the condition of logical nitrogen, stirring reaction is 1～2 hour, then adds wetting ability chainextender and linking agent, continues to stir 1～3 hour, obtains prepolymer; Described polyisocyanates is hydrogenated diphenyl methane diisocyanate and two trimethylene (tetramethyl-silica alkane) vulcabond, and both weight ratios are 0.7～0.5:0.3～0.5.
Step 4): prepolymer neutralization
The temperature of prepolymer is down to 35～55 ℃, in prepolymer, drips neutralizing agent, stirring reaction 15～45 minutes;
Step 5): chain extension and emulsification
Chainextender is dissolved in water, is made into the solution of 80% mass concentration, then expanding chain pharmaceutical solution is added drop-wise in the prepolymer after neutralization, stir speed (S.S.) is controlled at 1000～3000 rev/mins, stir 20～40 minutes, standing, obtain organic silicon modified aqueous polyurethane coating.
Contain siloxane bond (Si-O-Si-) in the present invention's two trimethylenes (tetramethyl-silica alkane) diisocyanate molecules used, because siloxane bond is compared large many of the bond distance of carbon-carbon bond (C-C-), so the flexibility of molecule increases greatly; Mode by it by copolymerization joins in the polyurethane molecular chain, can be good at improving the kindliness of polyurethane molecular chain, and then significantly reduces the modulus of urethane.
The present invention's polyether glycol used is polytetrahydrofuran, and the ptmg molecule chain is flexible chain, compares other stiff chain flexible large many.General Chain Flexibility is better, and modulus is lower.Soft section as urethane can be improved its flexibility, reduce its modulus.
The organic silicon modified aqueous polyurethane coating of gained of the present invention has been introduced siloxane bond (Si-O-Si-) on its molecular backbone chain, because siloxane bond is compared large many of the bond distance of carbon-carbon bond (C-C-), therefore the kindliness of chain is improved greatly; Simultaneously, polyether glycol used is soft segment; Thereby can be good at improving the kindliness of urethane, significantly reduce the modulus of urethane.Beneficial effect:
1, the organic silicon modified aqueous polyurethane coating of gained can spray, brushing, roller coat, dip-coating be to product surface.
2, the paint film of the organic silicon modified aqueous polyurethane coating of gained has excellent wear resistance, snappiness, rebound resilience, chemical resistance, solvent resistance.
3, gained organic silicon modified aqueous polyurethane coating modulus is low, in textiles, leather, building and some special industry, huge application prospect is arranged.
4, gained organic silicon modified aqueous polyurethane coating is Environmental Protective Water-paint, effectively reduces the discharge of volatile organic compounds in coating.
Embodiment
Below in conjunction with embodiment, further set forth the present invention.Should be understood that these embodiment only are not used in and limit the scope of the invention for the present invention is described.Should be understood that in addition those skilled in the art can make various changes or modifications the present invention after the content of having read the present invention's instruction, these equivalent form of values fall within the application's appended claims limited range equally.
A kind of organic silicon modified aqueous polyurethane coating of the present invention, this organic silicon modified aqueous polyurethane coating comprises following feed composition, calculates according to the mass fraction:
Polyisocyanates: 30～40;
Polyether glycol: 30～40;
Wetting ability chainextender: 3～10;
Chainextender: 2～10;
Linking agent: 1～3;
Neutralizing agent: 3～10.
The mixture that described polyisocyanates is hydrogenated diphenyl methane diisocyanate and two trimethylene (tetramethyl-silica alkane) vulcabond, both weight ratios are 0.7～0.5:0.3～0.5; The structural formula of described hydrogenated diphenyl methane diisocyanate is as follows:
The structural formula of described pair of trimethylene (tetramethyl-silica alkane) vulcabond is as follows:
Described polyether glycol is polytetrahydrofuran, and its molecular weight is 3000～6000.
Described hydrophilic chain extender is dimethylol propionic acid, dimethylolpropionic acid or tartrate.
Described chainextender is 1,6-hexylene glycol.
Described linking agent is TriMethylolPropane(TMP), trolamine or triethylamine.
Described neutralizing agent is triethylamine, Trimethylamine 99 or N, the N-dimethylethanolamine.
Embodiment 1
A kind of organic silicon modified aqueous polyurethane preparation method for coating, the method comprises the following steps:
Step 1: the preparation of two trimethylenes (tetramethyl-silica alkane) vulcabond
By tetramethyl--bis-(γ-aminopropyl) sily oxide and chlorobenzene, be the ratio wiring solution-forming of 0.5:0.5 by weight, then the solution for preparing at the uniform velocity is added drop-wise to excessive 4 by the speed of per minute 10ml, 4 '-diphenylmethanediisocyanate in, 175 times reactions, remove chlorobenzene under reduced pressure, then obtain two trimethylene (tetramethyl-silica alkane) vulcabond through separating-purifying.
Step 2: get the raw materials ready
Calculate and prepared burden by following feed composition and mass fraction:
Polyisocyanates: 30;
Polytetrahydrofuran: 30;
Dimethylol propionic acid: 3;
1,6-hexylene glycol: 2;
TriMethylolPropane(TMP): 1;
Triethylamine: 3.
Step 3: prepolymer is synthetic
Polyisocyanates and polytetrahydrofuran are added in reactor, and temperature is controlled at 90 ℃, and under the condition of logical nitrogen, stirring reaction is 2 hours, then adds wetting ability chainextender dimethylol propionic acid and linking agent TriMethylolPropane(TMP), continues to stir 2 hours, obtains prepolymer; Described polyisocyanates is hydrogenated diphenyl methane diisocyanate and two trimethylene (tetramethyl-silica alkane) vulcabond, and hydrogenated diphenyl methane diisocyanate used and two trimethylene (tetramethyl-silica alkane) vulcabond weight ratio are 0.7:0.3; The molecular weight of polytetrahydrofuran used is 3000～6000.
Step 4: prepolymer neutralization
The temperature of prepolymer is down to 55 ℃, in prepolymer, drips the neutralizing agent triethylamine, stirring reaction 45 minutes;
Step 5: chain extension and emulsification
By chainextender 1, the 6-hexylene glycol is dissolved in water, is made into the solution of 80% mass concentration, then expanding chain pharmaceutical solution is added drop-wise in the prepolymer after neutralization, stir speed (S.S.) is controlled at 2000 rev/mins, stirs 40 minutes, standing, obtain organic silicon modified aqueous polyurethane coating.
Embodiment 2
A kind of organic silicon modified aqueous polyurethane preparation method for coating, the method comprises the following steps:
Step 1: the preparation of two trimethylenes (tetramethyl-silica alkane) vulcabond
By tetramethyl--bis-(γ-aminopropyl) sily oxide and chlorobenzene, be the ratio wiring solution-forming of 0.6:0.4 by weight, then the solution for preparing at the uniform velocity is added drop-wise to excessive 4 by the speed of per minute 12ml, 4 '-diphenylmethanediisocyanate in, reaction under 180 ℃, remove chlorobenzene under reduced pressure, then obtain two trimethylene (tetramethyl-silica alkane) vulcabond through separating-purifying.
Step 2: get the raw materials ready
Calculate and prepared burden by following feed composition and mass fraction:
Polyisocyanates: 40;
Polytetrahydrofuran: 40;
Dimethylolpropionic acid: 10;
1,6-hexylene glycol: 10;
Trolamine: 3;
Trimethylamine 99: 10.
Step 3: prepolymer is synthetic
Polyisocyanates and polytetrahydrofuran are added in reactor, and temperature is controlled at 70 ℃, and under the condition of logical nitrogen, stirring reaction is 2 hours, then adds wetting ability chainextender dimethylolpropionic acid and linking agent trolamine, continues to stir 3 hours, obtains prepolymer; Described polyisocyanates is hydrogenated diphenyl methane diisocyanate and two trimethylene (tetramethyl-silica alkane) vulcabond, and hydrogenated diphenyl methane diisocyanate used and two trimethylene (tetramethyl-silica alkane) vulcabond weight ratio are 0.5:0.5; The molecular weight of polytetrahydrofuran used is 3000～6000.
Step 4: prepolymer neutralization
The temperature of prepolymer is down to 45 ℃, in prepolymer, drips the neutralizing agent Trimethylamine 99, stirring reaction 30 minutes;
Step 5: chain extension and emulsification
By chainextender 1, the 6-hexylene glycol is dissolved in water, is made into the solution of 80% mass concentration, then expanding chain pharmaceutical solution is added drop-wise in the prepolymer after neutralization, stir speed (S.S.) is controlled at 3000 rev/mins, stirs 30 minutes, standing, obtain organic silicon modified aqueous polyurethane coating.
Embodiment 3
A kind of organic silicon modified aqueous polyurethane preparation method for coating, the method comprises the following steps:
Step 1: the preparation of two trimethylenes (tetramethyl-silica alkane) vulcabond
By tetramethyl--bis-(γ-aminopropyl) sily oxide and chlorobenzene, be the ratio wiring solution-forming of 0.55:0.45 by weight, then the solution for preparing at the uniform velocity is added drop-wise to excessive 4 by the speed of per minute 11ml, 4 '-diphenylmethanediisocyanate in, reaction under 178 ℃, remove chlorobenzene under reduced pressure, then obtain two trimethylene (tetramethyl-silica alkane) vulcabond through separating-purifying.
Step 2: get the raw materials ready
Calculate and prepared burden by following feed composition and mass fraction:
Polyisocyanates: 35;
Polytetrahydrofuran: 35;
Tartrate: 5;
1,6-hexylene glycol: 6;
Triethylamine: 2;
N, N-dimethylethanolamine: 5.
Step 3: prepolymer is synthetic
Polyisocyanates and polytetrahydrofuran are added in reactor, and temperature is controlled at 80 ℃, and under the condition of logical nitrogen, stirring reaction is 1 hour, then adds wetting ability chainextender tartrate and linking agent triethylamine, continues to stir 2 hours, obtains prepolymer; Described polyisocyanates is hydrogenated diphenyl methane diisocyanate and two trimethylene (tetramethyl-silica alkane) vulcabond, and hydrogenated diphenyl methane diisocyanate used and two trimethylene (tetramethyl-silica alkane) vulcabond weight ratio are 0.6:0.4; The molecular weight of polytetrahydrofuran used is 3000～6000.
Step 4: prepolymer neutralization
The temperature of prepolymer is down to 35 ℃, in prepolymer, drips neutralizing agent N, N-dimethylethanolamine, stirring reaction 20 minutes;
Step 5: chain extension and emulsification
By chainextender 1, the 6-hexylene glycol is dissolved in water, is made into the solution of 80% mass concentration, then expanding chain pharmaceutical solution is added drop-wise in the prepolymer after neutralization, stir speed (S.S.) is controlled at 1000 rev/mins, stirs 20 minutes, standing, obtain organic silicon modified aqueous polyurethane coating.
Embodiment 4
A kind of organic silicon modified aqueous polyurethane preparation method for coating, the method comprises the following steps:
Step 1: the preparation of two trimethylenes (tetramethyl-silica alkane) vulcabond
By tetramethyl--bis-(γ-aminopropyl) sily oxide and chlorobenzene, be the ratio wiring solution-forming of 0.5:0.5 by weight, then the solution for preparing at the uniform velocity is added drop-wise to excessive 4 by the speed of per minute 11ml, 4 '-diphenylmethanediisocyanate in, reaction under 180 ℃, remove chlorobenzene under reduced pressure, then obtain two trimethylene (tetramethyl-silica alkane) vulcabond through separating-purifying.
Step 2: get the raw materials ready
Calculate and prepared burden by following feed composition and mass fraction:
Polyisocyanates: 35;
Polytetrahydrofuran: 40;
Dimethylolpropionic acid: 4;
1,6-hexylene glycol: 5;
Triethylamine: 1;
N, N-dimethylethanolamine: 4.
Step 3: prepolymer is synthetic
Polyisocyanates and polytetrahydrofuran are added in reactor, and temperature is controlled at 85 ℃, and under the condition of logical nitrogen, stirring reaction is 1 hour, then adds wetting ability chainextender dimethylolpropionic acid and linking agent triethylamine, continues to stir 1 hour, obtains prepolymer; Described polyisocyanates is hydrogenated diphenyl methane diisocyanate and two trimethylene (tetramethyl-silica alkane) vulcabond, and hydrogenated diphenyl methane diisocyanate used and two trimethylene (tetramethyl-silica alkane) vulcabond weight ratio are 0.4:0.6; The molecular weight of polytetrahydrofuran used is 3000～6000.
Step 4: prepolymer neutralization
The temperature of prepolymer is down to 45 ℃, in prepolymer, drips neutralizing agent N, N-dimethylethanolamine, stirring reaction 15 minutes;
Step 5: chain extension and emulsification
By chainextender 1, the 6-hexylene glycol is dissolved in water, is made into the solution of 80% mass concentration, then expanding chain pharmaceutical solution is added drop-wise in the prepolymer after neutralization, stir speed (S.S.) is controlled at 1000 rev/mins, stirs 30 minutes, standing, obtain organic silicon modified aqueous polyurethane coating.
Embodiment 5
A kind of organic silicon modified aqueous polyurethane preparation method for coating, the method comprises the following steps:
Step 1: the preparation of two trimethylenes (tetramethyl-silica alkane) vulcabond
By tetramethyl--bis-(γ-aminopropyl) sily oxide and chlorobenzene, be the ratio wiring solution-forming of 0.6:0.4 by weight, then the solution for preparing at the uniform velocity is added drop-wise to excessive 4 by the speed of per minute 12ml, 4 '-diphenylmethanediisocyanate in, reaction under 180 ℃, remove chlorobenzene under reduced pressure, then obtain two trimethylene (tetramethyl-silica alkane) vulcabond through separating-purifying.
Step 2: get the raw materials ready
Calculate and prepared burden by following feed composition and mass fraction:
Polyisocyanates: 38;
Polytetrahydrofuran: 36;
Dimethylolpropionic acid: 7;
1,6-hexylene glycol: 6;
TriMethylolPropane(TMP): 2;
N, N-dimethylethanolamine: 6.
Step 3: prepolymer is synthetic
Polyisocyanates and polytetrahydrofuran are added in reactor, temperature is controlled at 80 ℃, and under the condition of logical nitrogen, stirring reaction is 1.5 hours, then adds wetting ability chainextender dimethylolpropionic acid and linking agent TriMethylolPropane(TMP), continue to stir 2 hours, obtain prepolymer; Described polyisocyanates is hydrogenated diphenyl methane diisocyanate and two trimethylene (tetramethyl-silica alkane) vulcabond, and hydrogenated diphenyl methane diisocyanate used and two trimethylene (tetramethyl-silica alkane) vulcabond weight ratio are 0.5:0.5; The molecular weight of polytetrahydrofuran used is 3000～6000.
Step 4: prepolymer neutralization
The temperature of prepolymer is down to 40 ℃, in prepolymer, drips neutralizing agent N, N-dimethylethanolamine, stirring reaction 25 minutes;
Step 5: chain extension and emulsification
By chainextender 1, the 6-hexylene glycol is dissolved in water, is made into the solution of 80% mass concentration, then expanding chain pharmaceutical solution is added drop-wise in the prepolymer after neutralization, stir speed (S.S.) is controlled at 1500 rev/mins, stirs 30 minutes, standing, obtain organic silicon modified aqueous polyurethane coating.
Claims (8)
1. an organic silicon modified aqueous polyurethane coating, it is characterized in that: described organic silicon modified aqueous polyurethane coating comprises following feed composition, calculates according to the mass fraction:
Polyisocyanates: 30～40;
Polyether glycol: 30～40;
Wetting ability chainextender: 3～10;
Chainextender: 2～10;
Linking agent: 1～3;
Neutralizing agent: 3～10;
The mixture that described polyisocyanates is hydrogenated diphenyl methane diisocyanate and two trimethylene (tetramethyl-silica alkane) vulcabond, both weight ratios are 0.7～0.5:0.3～0.5;
The structural formula of described hydrogenated diphenyl methane diisocyanate is as follows:
The structural formula of described pair of trimethylene (tetramethyl-silica alkane) vulcabond is as follows:
2. a kind of organic silicon modified aqueous polyurethane coating according to claim 1, is characterized in that, described polyether glycol is polytetrahydrofuran, and its molecular weight is 3000～6000.
3. a kind of organic silicon modified aqueous polyurethane coating according to claim 1, is characterized in that, described hydrophilic chain extender is dimethylol propionic acid, dimethylolpropionic acid or tartrate.
4. a kind of organic silicon modified aqueous polyurethane coating according to claim 1, is characterized in that, described chainextender is 1,6-hexylene glycol.
5. a kind of organic silicon modified aqueous polyurethane coating according to claim 1, is characterized in that, described linking agent is TriMethylolPropane(TMP), trolamine or triethylamine.
6. a kind of organic silicon modified aqueous polyurethane coating according to claim 1, is characterized in that, described neutralizing agent is triethylamine, Trimethylamine 99 or N, the N-dimethylethanolamine.
7. the preparation method of a kind of organic silicon modified aqueous polyurethane coating as claimed in claim 1 is characterized in that comprising the following steps: step 1): the preparation of two trimethylenes (tetramethyl-silica alkane) vulcabond:
By tetramethyl--bis-(γ-aminopropyl) sily oxide and chlorobenzene, be the ratio wiring solution-forming of 0.5～0.6:0.5～0.4 by weight, then the solution for preparing at the uniform velocity is added drop-wise to excessive 4 by the speed of per minute 10～12ml, 4 '-diphenylmethanediisocyanate in, reaction under 175～180 ℃, remove chlorobenzene under reduced pressure, then obtain two trimethylene (tetramethyl-silica alkane) vulcabond through separating-purifying;
Step 2): prepolymer is synthetic:
Polyisocyanates and polyether glycol are added in reactor, and temperature is controlled at 70～90 ℃, and under the condition of logical nitrogen, stirring reaction is 1～2 hour, then adds wetting ability chainextender and linking agent, continues to stir 1～3 hour, obtains prepolymer; Described polyisocyanates is hydrogenated diphenyl methane diisocyanate and two trimethylene (tetramethyl-silica alkane) vulcabond, and its weight ratio is 0.7～0.5:0.3～0.5; Step 3): prepolymer neutralization:
The temperature of prepolymer is down to 35～55 ℃, in prepolymer, drips neutralizing agent, stirring reaction 15～45 minutes; Step 4): chain extension and emulsification:
Chainextender is dissolved in water, is made into the solution of 80% mass concentration, then expanding chain pharmaceutical solution is added drop-wise in the prepolymer after neutralization, stir, standing, obtain organic silicon modified aqueous polyurethane coating.
8. the preparation method of a kind of organic silicon modified aqueous polyurethane coating according to claim 7, is characterized in that, in described step 4), stir speed (S.S.) is controlled at 1000～3000 rev/mins, and churning time is 20～40 minutes.
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| CN109898342A (en) * | 2019-01-31 | 2019-06-18 | 四川大学 | A kind of scratch-resistant synthetic leather preparation method based on high rebound aqueous polyurethane |
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