CN107266652A - Uvioresistant polyurethane emulsion compositions and preparation method thereof - Google Patents
Uvioresistant polyurethane emulsion compositions and preparation method thereof Download PDFInfo
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- CN107266652A CN107266652A CN201710620432.6A CN201710620432A CN107266652A CN 107266652 A CN107266652 A CN 107266652A CN 201710620432 A CN201710620432 A CN 201710620432A CN 107266652 A CN107266652 A CN 107266652A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/08—Processes
- C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
- C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
- C08G18/6633—Compounds of group C08G18/42
- C08G18/6659—Compounds of group C08G18/42 with compounds of group C08G18/34
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
- C09D175/06—Polyurethanes from polyesters
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Abstract
The invention provides a kind of uvioresistant polyurethane emulsion compositions and preparation method thereof, the emulsion is made up of water and resin, wherein, the resin includes following reactive component：Aliphatic diisocyanate, aromatic diisocyanate, dimer acid polyester dihydric alcohol, hydrophilic chain extender, short chain chain extender, rear chain extender.The preparation method is：After dimer acid polyester dihydric alcohol is dehydrated, aromatic diisocyanate is added；After being reacted at 65 DEG C, aliphatic diisocyanate is added；After being reacted at 85 DEG C, hydrophilic chain extender is added；After being reacted at 85 DEG C, 75 DEG C are cooled to, short chain chain extender is added, after being reacted at 75 DEG C, 50 DEG C are cooled to, pH is to neutrality for regulation, is disperseed, and water and rear chain extender are added during scattered, emulsified, obtain the uvioresistant polyurethane emulsion compositions.Beneficial effects of the present invention are：Suitable for the face coat of outdoor facilities, there is outstanding weatherability and ageing resistance.
Description
Technical field
The present invention relates to a kind of uvioresistant polyurethane emulsion compositions and preparation method thereof, belong to polyurethane coating technology neck
Domain.
Background technology
Polyurethane is a kind of high molecular synthetic material of performance between rubber and plastics, is characterized in that hardness adjusts model
Enclose width, the elasticity of existing rubber has the hardness of plastics again, therefore possess good mechanical property and rebound performance, be particularly suitable for use in
Coatings art.Aqueous polyurethane coating, i.e., replace organic solvent as the polyurethane system of decentralized medium, pollution-free, peace with water
Complete reliable, function admirable, compatibility are good, easily modified, as current study hotspot.
When aqueous polyurethane coating is used for soft or rigid package surface, next step printing is generally required through UV machine cured printing inks.
If anti-UV ageing properties are not enough in itself for polyurethane coating, the adhesive force with upper strata ink layer can be caused to decline to a great extent, print is caused
Brush layer comes off, and situation about can not print again.
In order to solve the technological problemses, existing literature data mainly stresses two aspects, and one is the anti-UV agings auxiliary agent of addition, two
It is to introduce aromatic isocyanate.But the problems such as addition auxiliary agent can cause the levelling of polyurethane coating, bubble point produces, excessive to introduce
Aromatic isocyanate can cause polyurethane coating to be aggravated in experience UV solidification post yellowings again, can cause defect ware rate to rise.
The content of the invention
For defect of the prior art, it is an object of the invention to provide a kind of uvioresistant polyurethane emulsion compositions and its
Preparation method.
The present invention is achieved by the following technical solutions：
In a first aspect, the invention provides a kind of uvioresistant polyurethane emulsion compositions, be made up of water and resin, wherein,
The resin includes the following reactive component of percentage：
The percetage by weight selection gist of each reactive component is as follows：
If the percetage by weight of aliphatic diisocyanate is higher than 40%, final molecular weight can be caused too small, emulsion each side
Face performance is not enough；If less than 20%, the excessive easy condensation of synthesis viscosity can be caused again；The percetage by weight of aromatic diisocyanate
If higher than 5%, coating can be caused to cross the easily yellow side of UV machines, if less than 1%, the resistance to gentle hardness of coating can be caused not enough；It is hydrophilic
If the percetage by weight of chain extender is higher than 15%, synthesis viscosity can be caused big, emulsion is admittedly containing low, if less than 9%, can cause emulsion
Stability is poor, and levelling is deteriorated；If the percetage by weight of short chain chain extender is not in the range of 3~6%, emulsion synthesis can be caused steady
Qualitative difference；If the percetage by weight of rear chain extender is higher than 5%, emulsification can be caused difficult, if less than 1%, emulsion-stabilizing can be caused
Property be deteriorated.
It is resistance to causing the mechanical poor-performing of final resin if the percetage by weight of dimer acid polyester dihydric alcohol is higher than 50%
Temperature is low to be unfavorable for using；If less than 30%, can cause synthetic resin uvioresistant performance not enough again.The number of dimer acid polyester dihydric alcohol
Average molecular weight is selected 2000~5000, higher or lower than this scope, can all cause synthesis unstable, and the machinery of final resin
Poor performance.
Preferably, the weight ratio of the water and resin is 7:3.
Preferably, the aliphatic diisocyanate is selected from 4,4'- dicyclohexyl methyl hydride diisocyanates, different Buddhist
At least one of your ketone diisocyanate, hexamethylene diisocyanate.
Preferably, the aromatic diisocyanate is selected from toluene di-isocyanate(TDI), the isocyanide of diphenyl methane two
One or both of acid esters.
Preferably, the dimer acid polyester dihydric alcohol is nonpolar PEPA, with a large amount of nonpolar length
Chain aliphatic hydrocarbon structure.
Preferably, the one kind of the hydrophilic chain extender in dihydromethyl propionic acid and dimethylolpropionic acid.
Preferably, one or more of the short chain chain extender in ethylene glycol, butanediol, neopentyl glycol.
Preferably, the rear chain extender is selected from ethylenediamine, IPD, diethylene triamine, triethylene
One or more in urotropine.
Second aspect, the invention provides a kind of preparation method of uvioresistant polyurethane emulsion compositions as the aforementioned, its
Comprise the following steps：
After dimer acid polyester dihydric alcohol is dehydrated, aromatic diisocyanate is added；
After being reacted at 65 DEG C, aliphatic diisocyanate is added；
After being reacted at 85 DEG C, hydrophilic chain extender is added；
After being reacted at 85 DEG C, 75 DEG C are cooled to, short chain chain extender is added, after being reacted at 75 DEG C, cooling
To 50 DEG C, pH is to neutrality for regulation, is disperseed, and adds water and rear chain extender during scattered, is emulsified, obtains institute
State uvioresistant polyurethane emulsion compositions.
Preferably, the dewatering of the dimer acid polyester dihydric alcohol is：
By dimer acid polyester dihydric alcohol under 85 DEG C of vacuum condition, stirred with 200rpm rotating speed, until dimeric dibasic acid gathers
The water content of ester dihydric alcohol is less than 200ppm, completes dehydration.
The principle of the present invention is：The present invention will possess the dimer acid polyester dihydric alcohol of special construction first, and synthesis is applicable
In the aqueous polyurethane coating of UV cured printing ink techniques.Because dimer acid polyester dihydric alcohol possesses many long branched chain structures, into
Formation " screen effect " on main chain is enriched in membrane process, carbamate groups key on main chain is significantly reduced and absorbs ultraviolet hair
The probability of raw fracture.Synthesis initial stage, by adding appropriate aromatic isocyanate, is aggregated in the two ends of dimer acid polyester dihydric alcohol,
The problem of can significantly improve heatproof, the mechanical performance deficiency of the dihydric alcohol, moreover it is possible to pass through the length on dimer acid polyester dihydric alcohol
Methylene on side chain, protection aromatic isocyanate unit, it is to avoid because absorbing ultraviolet generation chromophoric group quinone-acid imide knot
Structure.It is significant to solving the anti-UV agings of polyurethane coating and xanthochromia in the lump.
Compared with prior art, the present invention has following beneficial effect：
1st, suitable for the face coat of outdoor facilities, there is outstanding weatherability and ageing resistance；
2nd, due to having " screen effect " of self-assembling formation, also outstanding erasibility, solvent resistance, oil and water repellency are refused
Energy；
3rd, being mixed with other aqueous polyurethane (polyester-type, polyether-type), oiliness polyurethane, aqueous acrylic emulsions etc. has
Good compatibility, is used for wider field after can mixing.
4th, metal-based catalysts, low VOC, environmental protection are free of in this resin synthesis process.
Embodiment
With reference to specific embodiment, the present invention is described in detail.Following examples will be helpful to the technology of this area
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that to the ordinary skill of this area
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention
Protection domain.
Embodiment 1
The present embodiment polyaminoester emulsion is prepared using the raw material of component and content as shown in table 1：
Table 1
| a | Dimer acid polyester dihydric alcohol (molecular weight 2000) | 300g |
| b | Toluene di-isocyanate(TDI) | 40g |
| c | IPDI | 265g |
| d | Dihydromethyl propionic acid | 135g |
| e | Butanediol | 50g |
| f | N, N '-dimethyl monoethanolamine | 72g |
| g | Diethylene triamine | 23.5g |
| h | Acetone | 700g |
| i | Deionized water | 1515g |
Above-mentioned polyaminoester emulsion is prepared in following processing steps：
Component a stirs dehydration, mixing speed is 200rpm at 85 DEG C under vacuum condition.Until the water content in component a is small
In after 200ppm, end vacuumizes recovery normal pressure, is reduced to 65 DEG C.It is kept stirring for and adds component b, keeps 65 DEG C of reaction 1h.
85 DEG C are warming up to, is kept stirring for and adds component c, 85 DEG C of reaction 1.5h are kept.It is kept stirring for and adds component d, 85 DEG C of continuation
Reaction 1 hour.75 DEG C are cooled to, component e is added, reacted 2 hours.50 DEG C are cooled to, component f is added, continues to stir 30 minutes
After discharge.The resin of synthesis is disperseed at a high speed under 1200rpm rotating speeds, component i is added, treats that stirring is split into emulsion completely, adds
Component g, then keeps 30min.The emulsion of synthesis is poured into rotary evaporation kettle, 50 DEG C vacuumize the lower revolving that carries out and remove third
Ketone, terminates after containing >=35% admittedly, obtains finished emulsion.
Embodiment 2
The present embodiment polyaminoester emulsion is prepared using the raw material of component and content as shown in table 2：
Table 2
Above-mentioned polyaminoester emulsion is prepared in following processing steps：
Component a stirs dehydration, mixing speed is 200rpm at 85 DEG C under vacuum condition.Until the water content in component a is small
In after 200ppm, end vacuumizes recovery normal pressure, is reduced to 65 DEG C.It is kept stirring for and adds component b, keeps 65 DEG C of reaction 1h.
85 DEG C are warming up to, is kept stirring for and adds component c, 85 DEG C of reaction 1.5h are kept.It is kept stirring for and adds component d, 85 DEG C of continuation
Reaction 1 hour.75 DEG C are cooled to, component e is added, reacted 2 hours.50 DEG C are cooled to, component f is added, continues to stir 30 minutes
After discharge.The resin of synthesis is disperseed at a high speed under 1200rpm rotating speeds, component i is added, treats that stirring is split into emulsion completely, adds
Component g, then keeps 30min.The emulsion of synthesis is poured into rotary evaporation kettle, 50 DEG C vacuumize the lower revolving that carries out and remove third
Ketone, terminates after containing >=35% admittedly, obtains finished emulsion.
Embodiment 3
The present embodiment polyaminoester emulsion is prepared using the raw material of component and content as shown in table 3：
Table 3
| a | Dimer acid polyester dihydric alcohol (molecular weight 2000) | 330g |
| b | Methyl diphenylene diisocyanate | 80g |
| c | IPDI | 250g |
| d | Dihydromethyl propionic acid | 110.3g |
| e | Propane diols | 32.5g |
| f | N, N '-dimethyl monoethanolamine | 56g |
| g | Ethylenediamine | 25g |
| h | Acetone | 700g |
| i | Deionized water | 1537g |
Above-mentioned polyaminoester emulsion is prepared in following processing steps：
Component a stirs dehydration, mixing speed is 200rpm at 85 DEG C under vacuum condition.Until the water content in component a is small
In after 200ppm, end vacuumizes recovery normal pressure, is reduced to 65 DEG C.It is kept stirring for and adds component b, keeps 65 DEG C of reaction 1h.
85 DEG C are warming up to, is kept stirring for and adds component c, 85 DEG C of reaction 1.5h are kept.It is kept stirring for and adds component d, 85 DEG C of continuation
Reaction 1 hour.75 DEG C are cooled to, component e is added, reacted 2 hours.50 DEG C are cooled to, component f is added, continues to stir 30 minutes
After discharge.The resin of synthesis is disperseed at a high speed under 1200rpm rotating speeds, component i is added, treats that stirring is split into emulsion completely, adds
Component g, then keeps 30min.The emulsion of synthesis is poured into rotary evaporation kettle, 50 DEG C vacuumize the lower revolving that carries out and remove third
Ketone, terminates after containing >=35% admittedly, obtains finished emulsion.
Comparative example 1
This comparative example polyaminoester emulsion is prepared using the raw material of component and content as shown in table 4：
Table 4
| a | Adipic acid type polyester diol (molecular weight 2000) | 300g |
| b | Methyl diphenylene diisocyanate | 40g |
| c | IPDI | 265g |
| d | Dihydromethyl propionic acid | 135g |
| e | Butanediol | 50g |
| f | N, N '-dimethyl monoethanolamine | 72g |
| g | Diethylene triamine | 23.5g |
| h | Acetone | 700g |
| i | Deionized water | 1515g |
Above-mentioned polyaminoester emulsion is prepared in following processing steps：
Component a stirs dehydration, mixing speed is 200rpm at 85 DEG C under vacuum condition.Until the water content in component a is small
In after 200ppm, end vacuumizes recovery normal pressure, is reduced to 65 DEG C.It is kept stirring for and adds component b, keeps 65 DEG C of reaction 1h.
85 DEG C are warming up to, is kept stirring for and adds component c, 85 DEG C of reaction 1.5h are kept.It is kept stirring for and adds component d, 85 DEG C of continuation
Reaction 1 hour.75 DEG C are cooled to, component e is added, reacted 2 hours.50 DEG C are cooled to, component f is added, continues to stir 30 minutes
After discharge.The resin of synthesis is disperseed at a high speed under 1200rpm rotating speeds, component i is added, treats that stirring is split into emulsion completely, adds
Component g, then keeps 30min.The emulsion of synthesis is poured into rotary evaporation kettle, 50 DEG C vacuumize the lower revolving that carries out and remove third
Ketone, terminates after containing >=35% admittedly, obtains finished emulsion.
Comparative example 2
This comparative example polyaminoester emulsion is prepared using the raw material of component and content as shown in table 5：
Table 5
Above-mentioned polyaminoester emulsion is prepared in following processing steps：
Component a stirs dehydration, mixing speed is 200rpm at 85 DEG C under vacuum condition.Until the water content in component a is small
In after 200ppm, end vacuumizes recovery normal pressure, is reduced to 65 DEG C.It is kept stirring for and adds component b, keeps 65 DEG C of reaction 1h.
85 DEG C are warming up to, is kept stirring for and adds component c, 85 DEG C of reaction 1.5h are kept.It is kept stirring for and adds component d, 85 DEG C of continuation
Reaction 1 hour.75 DEG C are cooled to, component e is added, reacted 2 hours.50 DEG C are cooled to, component f is added, continues to stir 30 minutes
After discharge.The resin of synthesis is disperseed at a high speed under 1200rpm rotating speeds, component i is added, treats that stirring is split into emulsion completely, adds
Component g, then keeps 30min.The emulsion of synthesis is poured into rotary evaporation kettle, 50 DEG C vacuumize the lower revolving that carries out and remove third
Ketone, terminates after containing >=35% admittedly, obtains finished emulsion.
The emulsion prepared to embodiment 1~3 and comparative example 1~2, carries out properties test, and testing standard is as follows：
Anti- UV burn-in tests：Emulsion will be prepared to be diluted with ethanol to 22% and admittedly contain, biaxial tension is coated on 6# bars and is gathered
Coated film is obtained on ester film (BOPET), it is then vacuum aluminum-coated, it is compounded in afterwards with BASF SD-602 glue in art post paperboard,
BOPET is gently stripped down, silver card specimen page is obtained.4# bars used for offset ink are coated on silver card specimen page, UV machines is crossed and consolidates
Change, UV energy 50mJ, machine speed 40m/min are set.Meter Qi Bang panfix adhesive tapes are then used, vertical stripping silver card curing ink layer is complete
It is the best 5A of adhesive force to be peeled off completely without method, and ink layer is completely separated into the worst 1C of adhesive force with silver card.
Yellowing resistance：Silver card specimen page is obtained by above-mentioned anti-UV ageing testing methods, the irradiation of UV machines is directly placed into, UV energy is set
Measure 100mJ, machine speed 20M/min.Silver card specimen page surface xanthochromia situation then is visually observed, is not changed color as most preferably, it is amber for most
Difference.
Temperature tolerance：Silver card specimen page is obtained by above-mentioned anti-UV ageing testing methods, the small specimen pages of 5cm*5cm is cut into, is put into and sets
60s is toasted in the baking oven for setting temperature, heatproof is not changed color as and passes through, continues to improve the test of baking oven heatproof.Change colour for heatproof it is not enough,
Oven temperature test is reduced, until finding the critical heatproof of mild discolorations.
Erasibility：Silver card specimen page is obtained by above-mentioned anti-UV ageing testing methods, with the cotton balls of infiltration salt solution, 300g pressure is wiped
Surface is wiped, record is wiped to the numerical value of silver card specimen page surface discolouration.
The emulsion prepared to embodiment 1~3 and comparative example 1~2, carries out properties test, as a result as shown in table 6：
Table 6
| Project | Embodiment 1 | Embodiment 2 | Embodiment 3 | Comparative example 1 | Comparative example 2 |
| Anti- UV agings | 5B | 5A | 5A | 1C | 2A |
| Yellowing resistance | Nondiscolouring | Nondiscolouring | Nondiscolouring | Mild discolorations | It is amber |
| Temperature tolerance | 140℃ | 145℃ | 155℃ | 135℃ | 160℃ |
| Erasibility | 400 times | 450 times | 500 times | 50 times | 100 times |
Common adipic acid type PEPA, the polyurethane resin of synthesis, anti-UV are used it can be seen from comparative example 1
Ageing properties are excessively poor, and this is due to the protection for lacking long branched chain structure, and carbamate groups key is easily because under ultraviolet light
It is broken.From comparative example 2 as can be seen that when there is substantial amounts of aromatic isocyanate in system, polyurethane can be lifted really
The anti-UV ageing properties of resin, but due to a lack of the protection of long branched chain structure so that the methylene on aromatic isocyanate unit,
Because there is colour developing group in ultraviolet light accelerated oxidation.
The specific embodiment of the present invention is described above.It is to be appreciated that the invention is not limited in above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring the substantive content of the present invention.
Claims (10)
1. a kind of uvioresistant polyurethane emulsion compositions, are made up of water and resin, it is characterised in that the resin is included by weight
The following reactive component of percentage meter：
2. uvioresistant polyurethane emulsion compositions as claimed in claim 1, it is characterised in that the weight ratio of the water and resin
For 7:3.
3. uvioresistant polyurethane emulsion compositions as claimed in claim 1, it is characterised in that the aliphatic diisocyanate
In 4,4'- dicyclohexyl methyl hydride diisocyanates, IPDI, hexamethylene diisocyanate at least
It is a kind of.
4. uvioresistant polyurethane emulsion compositions as claimed in claim 1, it is characterised in that the aromatic diisocyanate
Selected from one or both of toluene di-isocyanate(TDI), methyl diphenylene diisocyanate.
5. uvioresistant polyurethane emulsion compositions as claimed in claim 1, it is characterised in that the dimer acid polyester dihydric alcohol
For nonpolar PEPA.
6. uvioresistant polyurethane emulsion compositions as claimed in claim 1, it is characterised in that the hydrophilic chain extender is selected from two
One kind in hydroxymethyl propionic acid and dimethylolpropionic acid.
7. uvioresistant polyurethane emulsion compositions as claimed in claim 1, it is characterised in that the short chain chain extender is selected from second
One or more in glycol, butanediol, neopentyl glycol.
8. uvioresistant polyurethane emulsion compositions as claimed in claim 1, it is characterised in that the rear chain extender is selected from second two
One or more in amine, IPD, diethylene triamine, triethylene tetraamine.
9. a kind of preparation method of uvioresistant polyurethane emulsion compositions as claimed in claim 1, it is characterised in that including such as
Lower step：
After dimer acid polyester dihydric alcohol is dehydrated, aromatic diisocyanate is added；
After being reacted at 65 DEG C, aliphatic diisocyanate is added；
After being reacted at 85 DEG C, hydrophilic chain extender is added；
After being reacted at 85 DEG C, 75 DEG C are cooled to, short chain chain extender is added, after being reacted at 75 DEG C, is cooled to 50
DEG C, pH is to neutrality for regulation, is disperseed, and adds water and rear chain extender during scattered, is emulsified, and obtains described anti-
Ultraviolet polyaminoester emulsion composition.
10. the preparation method of uvioresistant polyurethane emulsion compositions as claimed in claim 9, it is characterised in that described
The dewatering of dimer acid polyester dihydric alcohol is：
By dimer acid polyester dihydric alcohol under 85 DEG C of vacuum condition, stirred with 200rpm rotating speed, until dimer acid polyester two
The water content of first alcohol is less than 200ppm, completes dehydration.
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| CN108250933A (en) * | 2017-12-29 | 2018-07-06 | 上海维凯光电新材料有限公司 | Anti-fall ring of light friendly coating and preparation method thereof |
| CN108264621A (en) * | 2017-12-29 | 2018-07-10 | 上海维凯光电新材料有限公司 | A kind of heterogeneous chain extension synthetic method of aqueous polyurethane |
| CN108250933B (en) * | 2017-12-29 | 2020-06-26 | 上海维凯光电新材料有限公司 | Anti-reflection environment-friendly coating and preparation method thereof |
| CN114720361A (en) * | 2022-03-29 | 2022-07-08 | 江苏博汇纸业有限公司 | Paper pattern aging test method suitable for white cardboard |
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