CN104893527A - Aqueous polyurethane coating with increased limiting film thickness and preparation method of aqueous polyurethane coating - Google Patents
Aqueous polyurethane coating with increased limiting film thickness and preparation method of aqueous polyurethane coating Download PDFInfo
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- CN104893527A CN104893527A CN201510314105.9A CN201510314105A CN104893527A CN 104893527 A CN104893527 A CN 104893527A CN 201510314105 A CN201510314105 A CN 201510314105A CN 104893527 A CN104893527 A CN 104893527A
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- aqueous polyurethane
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Abstract
The invention discloses an aqueous polyurethane coating with an increased limiting film thickness and a preparation method of the aqueous polyurethane coating. The aqueous polyurethane coating comprises a composition A and a composition B, wherein the composition A comprises the following components in parts by weight: 35-42 parts of water based hydroxy acrylic acid a, 15-18 parts of water based hydroxy acrylic acid b, 25-30 parts of a filler, 1-3 parts of additives, 4-6 parts of a film-forming additive c and 7-10 parts of water; the composition B comprises the following components in parts by weight: 8-10 parts of water, 80-90 parts of isocyanate and 3-5 parts a film-forming additive d. The preparation method comprises the following steps: uniformly mixing and stirring water and part of the additives; adding the filler; carrying out dispersion in a high-speed state till the preset fineness is reached; then, reducing the dispersion speed, and uniformly stirring water based hydroxy acrylic acid a, water based hydroxy acrylic acid b and part of the additives to obtain the composition A; uniformly mixing and stirring water, isocyanate and the film-forming additive d to obtain the composition B. The aqueous polyurethane coating provided by the invention is extremely low in VOC, high in physical and mechanical performance, high in limiting film thickness, and suitable for the application scenario of environmental-friendly high decorative finishing coating.
Description
[technical field]
The invention belongs to chemical material technical field, be specifically related to a kind of aqueous polyurethane coating improving limiting film thickness and preparation method thereof.
[background technology]
Double-component polyurethane coating is generated by polyisocyanates and polyol reaction, containing a considerable amount of ammonia ester bond in film.Not only containing ammonia ester bond in polyurethane coating, also has other functional group, as urea key, ester bond, ehter bond, allophanic acid ester bond and acylurea key.Thus make polyurethane coating both have good mechanical property, such as there is good hardness, snappiness, wear resistance and shock-resistance; There is again excellent chemical mediator-resitant property, as good water tolerance, resistance to acids and bases, humidity resistance; Urethane has good weathering resistance in addition, can use as a kind of decorative finishes.
Most polyurethane coating is solvent based coating in the market, in aqueous polyurethane performance history, under higher film thickness, easily there is bubble drying varniss rear surface, the phenomenon that is commonly called as that heat rash appears, becomes the large key factor hindering aqueous polyurethane coating application.But, along with the progressively enhancing of environmental consciousness, the appearance of the VOC excise, the exploitation of aqueous polyurethane is extremely urgent, therefore the limiting film thickness (heat rash appears situation under the highest thickness) improving aqueous polyurethane coating becomes the key problem in technology of aqueous polyurethane coating development, but most aqueous polyurethane coating is under the existing processing condition of engineering machinery, also not yet reach the limiting film thickness requirement of engineering machinery polyurethane coating.
Invention about aqueous polyurethane coating and modified aqueous polyurethane coating thereof has many examples, but majority pays close attention to the water tolerance after film forming or hardness etc., not yet reports the non-foaming thickness improved in aqueous polyurethane use procedure.
Water-based hydroxyl ACRYLIC EMULSION is as the filmogen in coating film process, its selection is most important in formula, because there being the control of productive temp in engineering machinery coating process, require that aqueous polyurethane coating has rate of drying and higher hardness faster, engineering machinery spraying simultaneously adopts hand spray more, therefore require again the applicable scope of wider thickness, thus have higher requirement to film limiting film thickness.The ACRYLIC EMULSION that second-order transition temperature (Tg) is higher, in film process, the requirement of its drying property and hardness can be met, the ACRYLIC EMULSION that second-order transition temperature (Tg) is lower, in film process, can make in higher thickness situation, moisture and reaction bubble volatilize timely and discharge, thus obtain the environment-friendly type high-decoration aqueous polyurethane topcoat paint of high-mechanical property, high limit thickness.
[summary of the invention]
The object of the invention is to research and develop a kind of aqueous polyurethane coating improving limiting film thickness and preparation method thereof.
Aqueous polyurethane coating provided by the invention, using water-based hydroxyl ACRYLIC EMULSION a, b as filmogen, and adds appropriate filler and auxiliary agent, film coalescence aid and preparing; Adopt isocyanic ester as solidifying agent, and add suitable film coalescence aid, make its paint film have excellent mechanical property, high limiting film thickness and weather resistance.This coating is used for metal material surface, meets the weathering resistance of coating and ornamental.
Aqueous polyurethane coating provided by the invention, comprises A, B two components, wherein:
Component A, by weight, comprising:
Water: 7-10 part;
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, is formed by methyl methacrylate, butyl acrylate, Hydroxyethyl acrylate and acrylic acid copolymer: 15-18 part;
Filler: 25-30 part;
Auxiliary agent: 1-3 part, auxiliary agent comprises: dispersion agent, substrate wetting agents, defoamer, pH adjusting agent, thickening material;
Film coalescence aid c selects PMA (1-Methoxy-2-propyl acetate): 4-6 part;
B component, by weight, comprising:
Water: 8 ~ 10 parts;
Hydrophilic isocyanate: 80-90 part;
Film coalescence aid d selects PGDA (PGDA): 3-5 part,
-NCO：-OH＝1.5:1。
The preparation method of the aqueous polyurethane coating of raising limiting film thickness provided by the invention, comprises the preparation of component A and the preparation of B component; Concrete steps are:
The preparation of component A: first water, part of auxiliary are comprised defoamer, substrate wetting agents, dispersant stir, add filler more under high velocity agitation, be dispersed at high speeds and reach regulation fineness; Then reduction of speed, adds water-based hydroxyl ACRYLIC EMULSION a, b, defoamer, thickening material and film coalescence aid PMA, stirs, namely obtain aqueous polyurethane coating component A;
The preparation of B component: by water, isocyanate curing agent and film coalescence aid d mixing and stirring, namely obtain aqueous polyurethane coating B component.
In the present invention, described water-based hydroxyl ACRYLIC EMULSION a is the emulsion that second-order transition temperature is higher, its Tg scope: 30-60 DEG C, preferred 35-50 DEG C.
In the present invention, described water-based hydroxyl ACRYLIC EMULSION b is the emulsion that second-order transition temperature is lower, its Tg scope :-5-20 DEG C, preferred 0-10 DEG C.
In the present invention, described water-based hydroxyl ACRYLIC EMULSION a, b ratio, scope can between 3:2-4:1, preferential 7:3.
In the present invention, described filler comprises: titanium dioxide.
In the present invention, described dispersion agent comprises: Bi Ke 191, EFKA 4310, enlightening height 745W etc.Described substrate wetting agents comprises: Bi Ke 346, enlightening are high by 245.Described defoamer comprises: BYK Bi Ke 021, Bi Ke 022, Sheng Nuopuke 154,1311 etc.Described pH adjusting agent comprises: 2-amino-2-methyl-1-propanol, ammoniacal liquor etc.Described thickening material comprises: Bi Ke 420, Bi Ke 425, Degussa A200 etc.Described film coalescence aid comprises: PGDA (PGDA), PMA (1-Methoxy-2-propyl acetate) etc.
Aqueous polyurethane coating of the present invention has extremely low VOC, excellent physical and mechanical properties and high limiting film thickness and weather resistance.This coating be coated with can be used for the metallic surface such as iron and steel, aluminium, after coating film forming weathering resistance and visual appearance good.
[accompanying drawing explanation]
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, further describe the present invention.
First, raw material prepares:
Secondly, preparation process:
Component A: add 1-4 (defoamer adds under shearing force), stir, add 5 under high velocity agitation, add zirconium pearl and be milled to fineness and be less than 10 μm, reduction of speed adds 6-10, obtained aqueous polyurethane coating component A after stirring.
B component: add after 1-4 stirs and obtain aqueous polyurethane B component.
Finally, the coating property obtained test tested by the testing method of corresponding national Specification, performance is as follows:
Claims (10)
1. improve an aqueous polyurethane coating for limiting film thickness, comprise and comprise A, B two components, it is characterized in that:
Component A, by weight, comprising:
Water: 7-10 part;
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, is formed by methyl methacrylate, butyl acrylate, Hydroxyethyl acrylate and acrylic acid copolymer: 15-18 part;
Filler: 25-30 part;
Auxiliary agent: 1-3 part, auxiliary agent comprises: dispersion agent, substrate wetting agents, defoamer, pH adjusting agent, thickening material;
Film coalescence aid c selects PMA (1-Methoxy-2-propyl acetate): 4-6 part;
B component, by weight, comprising:
Water: 8-10 part;
Isocyanic ester: 80-90 part;
Film coalescence aid d selects PGDA (PGDA): 3-5 part;
-NCO：-OH＝1.5:1。
2. the aqueous polyurethane coating of raising limiting film thickness according to claim 1, is characterized in that, described water-based hydroxyl ACRYLIC EMULSION a, second-order transition temperature Tg:30-60 DEG C.
3. the aqueous polyurethane coating of raising limiting film thickness according to claim 2, is characterized in that, described water-based hydroxyl ACRYLIC EMULSION a, second-order transition temperature Tg: preferably 35-50 DEG C.
4. the aqueous polyurethane coating of raising limiting film thickness according to claim 1, is characterized in that, described water-based hydroxyl ACRYLIC EMULSION b, second-order transition temperature Tg:-5-20 DEG C.
5. the aqueous polyurethane coating of raising limiting film thickness according to claim 4, is characterized in that, described water-based hydroxyl ACRYLIC EMULSION b, second-order transition temperature Tg: preferably 0-10 DEG C.
6. the aqueous polyurethane coating of the raising limiting film thickness according to claim 1 or 2 or 4, is characterized in that, water-based hydroxyl ACRYLIC EMULSION a and water-based hydroxyl ACRYLIC EMULSION b mass ratio are: 3:2-4:1.
7. the aqueous polyurethane coating of raising limiting film thickness according to claim 6, is characterized in that, water-based hydroxyl ACRYLIC EMULSION a and water-based hydroxyl ACRYLIC EMULSION b mass ratio are preferably 7:3.
8. improve the aqueous polyurethane coating of limiting film thickness according to claim 1, it is characterized in that, described filler comprises: titanium dioxide; Described dispersion agent comprises: Bi Ke 191, EFKA 4310, enlightening height 745W etc., described substrate wetting agents comprises: Bi Ke 346, enlightening are high by 245, described defoamer comprises: BYK Bi Ke 021, Bi Ke 022, Sheng Nuopuke 154,1311 etc., described pH adjusting agent comprises: 2-amino-2-methyl-1-propanol, ammoniacal liquor etc., and described thickening material comprises: Bi Ke 420, Bi Ke 425, Degussa A200 etc.
9. improve a preparation method for the aqueous polyurethane coating of limiting film thickness according to claim 1, comprise the preparation of component A and the preparation of B component; It is characterized in that, concrete steps are:
The preparation of component A: first water, part of auxiliary are comprised defoamer, substrate wetting agents, dispersant stir, add filler more under high velocity agitation, be dispersed at high speeds and reach regulation fineness; Then reduction of speed, adds water-based hydroxyl ACRYLIC EMULSION a, b, defoamer, thickening material and film coalescence aid PMA, stirs, namely obtain aqueous polyurethane coating component A;
The preparation of B component: by water, isocyanate curing agent and film coalescence aid d mixing and stirring, namely obtain aqueous polyurethane coating B component.
10. the preparation method of the aqueous polyurethane coating of raising limiting film thickness according to claim 9, is characterized in that, described filler comprises: titanium dioxide; Described dispersion agent comprises: Bi Ke 191, EFKA 4310, enlightening height 745W etc., described substrate wetting agents comprises: Bi Ke 346, enlightening are high by 245, described defoamer comprises: BYK Bi Ke 021, Bi Ke 022, Sheng Nuopuke 154,1311 etc., described pH adjusting agent comprises: 2-amino-2-methyl-1-propanol, ammoniacal liquor etc., and described thickening material comprises: Bi Ke 420, Bi Ke 425, Degussa A200 etc.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| CN107057545A (en) * | 2016-12-28 | 2017-08-18 | 中国海洋石油总公司 | Applied in aqueous dual-component acroleic acid polyurethane and preparation method thereof |
| CN107400454A (en) * | 2016-05-19 | 2017-11-28 | 湖南邦弗特新材料技术有限公司 | A kind of salt spray resistance dual-component aqueous polyurethane varnish and preparation method thereof |
| CN108034346A (en) * | 2017-12-21 | 2018-05-15 | 万华化学（宁波）有限公司 | A kind of coating system for the composition and its formation for being used to produce aqueous coating |
| 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 |
| CN111875769A (en) * | 2020-08-21 | 2020-11-03 | 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 |
| CN115926600A (en) * | 2023-01-06 | 2023-04-07 | 江苏德威涂料有限公司 | Waterborne polyurethane coating and preparation method thereof |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN107400454A (en) * | 2016-05-19 | 2017-11-28 | 湖南邦弗特新材料技术有限公司 | A kind of salt spray resistance dual-component aqueous polyurethane varnish 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 |
| CN107057545A (en) * | 2016-12-28 | 2017-08-18 | 中国海洋石油总公司 | Applied in aqueous dual-component acroleic acid polyurethane and preparation method thereof |
| CN108034346A (en) * | 2017-12-21 | 2018-05-15 | 万华化学（宁波）有限公司 | A kind of coating system for the composition and its formation for being used to produce aqueous coating |
| 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 |
| CN111875769A (en) * | 2020-08-21 | 2020-11-03 | 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 |
| 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 |
| CN115926600A (en) * | 2023-01-06 | 2023-04-07 | 江苏德威涂料有限公司 | Waterborne 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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