CN104893527B - A kind of aqueous polyurethane coating for improving limiting film thickness and preparation method thereof - Google Patents
A kind of aqueous polyurethane coating for improving limiting film thickness and preparation method thereof Download PDFInfo
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- CN104893527B CN104893527B CN201510314105.9A CN201510314105A CN104893527B CN 104893527 B CN104893527 B CN 104893527B CN 201510314105 A CN201510314105 A CN 201510314105A CN 104893527 B CN104893527 B CN 104893527B
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Abstract
The invention discloses a kind of aqueous polyurethane coating for improving limiting film thickness and preparation method thereof, the aqueous polyurethane includes the component of A, B two, and component A mainly includes the component of following parts by weight：35 42% parts of water-based hydroxyl acrylic acid a, 15 18% parts of water-based hydroxyl acrylic acid b, 25 30% fillers, 1 3% auxiliary agent, 4 6% coalescents c, 7 10% water；B component mainly includes the component of following parts by weight：8~10% water, 80 90% isocyanates, 3 5% coalescents d；Its preparation method is：Water, part of auxiliary are mixed evenly, filler is added, and is dispersed to reaches regulation fineness at high speeds, then reduction of speed, which stirs water-based hydroxyl acrylic acid a, b and part of auxiliary, can obtain aqueous polyurethane coating component A.First water, isocyanates, coalescents are mixed evenly for B component.The aqueous polyurethane coating of the present invention has extremely low VOC, excellent physical and mechanical properties and high limiting film thickness, is suitably applied environment-friendly type high-decoration topcoat paint.
Description
[technical field]
The invention belongs to chemical material technical field, and in particular to a kind of aqueous polyurethane coating of raising limiting film thickness and
Its preparation method.
[background technology]
Double-component polyurethane coating is generated by polyisocyanates and polyol reaction, and a considerable amount of urethanes are contained in film
Key.Not only contain ammonia ester bond in polyurethane coating, also have other functional groups, such as urea bond, ester bond, ehter bond, allophanic acid ester bond
And acyl group urea bond.So that polyurethane coating both has good mechanical performance, such as with preferable hardness, flexible
Property, wearability and impact resistance；There is excellent chemical mediator-resitant property, such as preferable water resistance, resistance to acids and bases, moisture-proof again
It is hot；Other polyurethane has preferable weatherability, can be used as a kind of decorative finishes.
During most polyurethane coating is solvent based coating, aqueous polyurethane development process in the market, higher
Film thickness under, surface tends to have bubble after drying varniss, the phenomenon that is commonly called as that heat rash appears, as hindering aqueous polyurethane coating application
A big key factor.However, with the progressively enhancing of environmental consciousness, the appearance of the VOC consumption taxes, the exploitation of aqueous polyurethane is compeled
In the eyebrows and eyelashes, therefore the limiting film thickness (the highest thickness in the case of heat rash appears) of aqueous polyurethane coating is improved as aqueous poly- ammonia
The key problem in technology of ester paint development, but most aqueous polyurethane coating is under the conditions of engineering machinery existing process, also still
The not up to limiting film thickness requirement of engineering machinery polyurethane coating.
Invention many examples, but most concerns on aqueous polyurethane coating and its modified aqueous polyurethane coating
In water resistance or hardness after film forming etc., the non-foaming thickness during raising aqueous polyurethane use is not yet reported.
Water-based hydroxyl acrylic emulsion is as the film forming matter in coating film forming procedure, and it selects heavy to closing in formula
Will, because there is the control of productive temp in engineering machinery coating process, it is desirable to which aqueous polyurethane coating has faster rate of drying
And higher hardness, while engineering machinery spraying uses hand spray, therefore require there is the applicable scope of wider thickness again,
So as to there is higher requirement to film limiting film thickness.The higher acrylic emulsion of glass transition temperature (Tg), in film forming procedure, energy
The requirement of its drying property and hardness is met, the relatively low acrylic emulsion of glass transition temperature (Tg) in film forming procedure, can make
In the case of higher thickness, moisture and timely volatilization and the discharge of reaction bubble, so as to obtain high-mechanical property, the ring of high limit thickness
Guarantor's type high-decoration aqueous polyurethane topcoat paint.
[content of the invention]
It is an object of the invention to research and develop a kind of aqueous polyurethane coating for improving limiting film thickness and preparation method thereof.
The aqueous polyurethane coating that the present invention is provided, using water-based hydroxyl acrylic emulsion a, b as film forming matter, and is added
Appropriate filler and auxiliary agent, coalescents and prepare；Using isocyanates as curing agent, and add suitable film forming and help
Agent, makes its paint film have excellent mechanical performance, high limiting film thickness and weather resistance.The coating is used for metal material table
Face, meets the weatherability and dicoration of coating.
The aqueous polyurethane coating that the present invention is provided, comprising two components of A, B, wherein：
Component A, by weight, including：
Water：7-10 parts；
Water-based hydroxyl acrylic emulsion a, is formed by methyl methacrylate, butyl acrylate and acrylic acid copolymer：35-42
Part；
Water-based hydroxyl acrylic emulsion b, by methyl methacrylate, butyl acrylate, hydroxy-ethyl acrylate and acrylic acid
Copolymerization is formed：15-18 parts；
Filler：25-30 parts；
Auxiliary agent：1-3 parts, auxiliary agent includes：Dispersant, substrate wetting agents, defoamer, pH adjusting agent, thickener；
Coalescents c selects PMA (propylene glycol methyl ether acetate)：4-6 parts；
B component, by weight, including：
Water：8~10 parts；
Hydrophilic isocyanate：80-90 parts；
Coalescents d selects PGDA (propylene glycol diacetate)：3-5 parts,
-NCO：- OH=1.5:1.
The preparation method of the aqueous polyurethane coating for the raising limiting film thickness that the present invention is provided, includes preparation and the B of component A
The preparation of component；Concretely comprise the following steps：
The preparation of component A：Water, part of auxiliary first are included into defoamer, substrate wetting agents, dispersant to stir,
Filler is added under high velocity agitation, is dispersed to reaches regulation fineness at high speeds；Then reduction of speed, adds water-based hydroxyl third
Olefin(e) acid emulsion a, b, defoamer, thickener and coalescents PMA, stir, that is, obtain aqueous polyurethane coating component A；
The preparation of B component：Water, isocyanate curing agent and coalescents d are mixed evenly, that is, obtain aqueous poly- ammonia
Ester paint B component.
In the present invention, described water-based hydroxyl acrylic emulsion a is the higher emulsion of glass transition temperature, its Tg scope：30-
60 DEG C, preferably 35-50 DEG C.
In the present invention, described water-based hydroxyl acrylic emulsion b is the relatively low emulsion of glass transition temperature, its Tg scope：-5-
20 DEG C, preferably 0-10 DEG C.
In the present invention, described water-based hydroxyl acrylic emulsion a, b ratio, scope can be 3:2-4:Between 1, preferential 7:3.
In the present invention, described filler includes：Titanium dioxide.
In the present invention, the dispersant includes：Bi Ke 191, the high 745W of EFKA 4310, enlightening etc..The substrate wetting agents
Including：Bi Ke 346, enlightening are high by 245.The defoamer includes：BYK Bi Ke 021, Bi Ke 022, Sheng Nuopuke 154,1311 etc..Institute
Stating pH adjusting agent includes：2-amino-2-methyl-1-propanol, ammoniacal liquor etc..The thickener includes：Bi Ke 420, Bi Ke 425, moral
Admittedly match A200 etc..The coalescents include：PGDA (propylene glycol diacetate), PMA (propylene glycol methyl ether acetate) etc..
The aqueous polyurethane coating of the present invention has extremely low VOC, excellent physical and mechanical properties and high limit film
Thick and weather resistance.The coating, which is applied, can be used for weatherability and presentation quality after the metal surfaces such as steel, aluminium, coating film forming good
It is good.
[brief description of the drawings]
Fig. 1 is common water borne polyurethane coating coating surface electron microscope view
Fig. 2 is high limit thickness aqueous polyurethane coating coating surface electron microscope view
[embodiment]
Below by specific embodiment, the present invention is further described.
First, raw material prepares：
Secondly, preparation process：
Component A：1-4 (defoamer is added under shearing force) is added, is stirred, 5 are added under high velocity agitation, plus
Zirconium pearl is milled to fineness less than 10 μm, and reduction of speed adds 6-10, and aqueous polyurethane coating component A is made after stirring.
B component：Add after 1-4 stirs and aqueous polyurethane B component is made.
Finally, the coating property test of acquisition is tested by the method for testing of corresponding national Specification, performance is as follows：
Claims (7)
1. the aqueous polyurethane coating of limiting film thickness is improved a kind of, including includes two components of A, B, it is characterised in that：
Component A, by weight, including：
Water：7-10 parts；
Water-based hydroxyl acrylic emulsion a, is formed by methyl methacrylate, butyl acrylate and acrylic acid copolymer：35-42 parts,
Glass transition temperature Tg：30-60℃；
Water-based hydroxyl acrylic emulsion b, by methyl methacrylate, butyl acrylate, hydroxy-ethyl acrylate and acrylic acid copolymer
Form：15-18 parts, glass transition temperature Tg：-5-20℃；
Filler：25-30 parts；
Auxiliary agent：1-3 parts, auxiliary agent is dispersant, substrate wetting agents, defoamer and thickener；
Coalescents c selects PMA (propylene glycol methyl ether acetate)：4-6 parts；
B component, by weight, including：
Water：8-10 parts；
Isocyanates：80-90 parts；
Coalescents d selects PGDA (propylene glycol diacetate)：3-5 parts；
-NCO：- OH=1.5:1.
2. the aqueous polyurethane coating according to claim 1 for improving limiting film thickness, it is characterised in that the water-based hydroxyl
Acrylic emulsion a, glass transition temperature Tg：35-50℃.
3. the aqueous polyurethane coating according to claim 1 for improving limiting film thickness, it is characterised in that the water-based hydroxyl
Acrylic emulsion b, glass transition temperature Tg：0-10℃.
4. the aqueous polyurethane coating according to claim 1 for improving limiting film thickness, it is characterised in that water-based hydroxyl propylene
Yogurt liquid a is 7 with water-based hydroxyl acrylic emulsion b mass ratioes:3.
5. the aqueous polyurethane coating of limiting film thickness is improved according to claim 1, it is characterised in that
Described filler includes：Titanium dioxide；
The dispersant includes：Bi Ke 191, EFKA 4310 or the high 745W of enlightening,
The substrate wetting agents include：Bi Ke 346 or enlightening are high by 245,
The defoamer includes：BYK Bi Ke 021, Bi Ke 022, Sheng Nuopuke 154 or 1311,
The thickener includes：Bi Ke 420, Bi Ke 425 or Degussa A200.
6. a kind of preparation method for the aqueous polyurethane coating for improving limiting film thickness according to claim 1, including component A
Prepare the preparation with B component；Characterized in that, concretely comprising the following steps：
The preparation of component A：First water, part of auxiliary are stirred including defoamer, substrate wetting agents and dispersant, in height
Filler is added under speed stirring, is dispersed to reaches regulation fineness at high speeds；Then reduction of speed, adds water-based hydroxyl acrylic acid
Emulsion a, b, defoamer, thickener and coalescents PMA, stir, that is, obtain aqueous polyurethane coating component A；
The preparation of B component：Water, isocyanate curing agent and coalescents d are mixed evenly, that is, obtain aqueous polyurethane painting
Expect B component.
7. the preparation method of the aqueous polyurethane coating according to claim 6 for improving limiting film thickness, it is characterised in that
Described filler includes：Titanium dioxide；
The dispersant includes：Bi Ke 191, EFKA 4310 or the high 745W of enlightening,
The substrate wetting agents include：Bi Ke 346 or enlightening are high by 245,
The defoamer includes：BYK Bi Ke 021, Bi Ke 022, Sheng Nuopuke 154 or 1311,
The thickener includes：Bi Ke 420, Bi Ke 425 or Degussa A200.
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105295697A (en) * | 2015-11-23 | 2016-02-03 | 佛山市南海彤粤高分子材料有限公司 | Aqueous PU self-curing paint and preparation method thereof |
| CN107400454B (en) * | 2016-05-19 | 2019-12-27 | 湖南邦弗特新材料技术有限公司 | Salt-fog-resistant bi-component waterborne polyurethane varnish and preparation method thereof |
| CN105838223A (en) * | 2016-06-13 | 2016-08-10 | 四川颜鼎水性环保漆科技有限公司 | Aqueous double-ingredient polyurethane paint without limit film thickness and preparation method thereof |
| CN107057545B (en) * | 2016-12-28 | 2019-08-02 | 中国海洋石油总公司 | Applied in aqueous dual-component acroleic acid polyurethane and preparation method thereof |
| CN108034346B (en) * | 2017-12-21 | 2020-07-28 | 万华化学（宁波）有限公司 | Composition for producing water-based coating and coating system formed by composition |
| CN108690448A (en) * | 2018-02-26 | 2018-10-23 | 河北晨阳工贸集团有限公司 | A kind of medical instrument allochroic paint and its preparation method and application |
| CN109207002A (en) * | 2018-07-19 | 2019-01-15 | 上海福岛新材料科技有限公司 | A kind of single-component water-based paint of environment-friendly waterproof anti-corrosion |
| CN110922877A (en) * | 2019-12-13 | 2020-03-27 | 广东四方威凯新材料有限公司 | Waterborne polyurethane coating and preparation method thereof |
| CN111073497A (en) * | 2019-12-31 | 2020-04-28 | 山东七维新材料有限公司 | Waterborne acrylic polyurethane finish paint capable of obviously improving explosion limit |
| CN111875769B (en) * | 2020-08-21 | 2022-03-22 | 山西省应用化学研究所(有限公司) | High-solid-content aqueous polyurethane composite emulsion and preparation method thereof |
| CN112662251A (en) * | 2020-12-18 | 2021-04-16 | 上海瀚岱化学有限公司 | Thick-coating type water-based acrylic polyurethane coating and preparation method thereof |
| CN115926600B (en) * | 2023-01-06 | 2023-11-10 | 江苏德威涂料有限公司 | Water-based polyurethane coating and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| ATE258212T1 (en) * | 1998-06-23 | 2004-02-15 | Akzo Nobel Nv | AQUEOUS COATING COMPOSITION CONTAINING AN ADDITION POLYMER AND A RHEOLOGY MODIFIER |
| CN1557892A (en) * | 2004-01-18 | 2004-12-29 | 西北师范大学 | Water bicomponent polyurethane paints and process for preparing the same |
| CN102408792B (en) * | 2011-10-11 | 2013-08-07 | 吉林大学 | Waterborne damping coating for vehicle |
| CN103554412B (en) * | 2013-10-22 | 2015-08-05 | 北京金汇利应用化工制品有限公司 | A kind of aqueous dual-component acrylic acid-polyurethane resin and preparation method thereof |
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