CN104497777B - A kind of room-temperature self-crosslinking water-based coating and its production and use - Google Patents
A kind of room-temperature self-crosslinking water-based coating and its production and use Download PDFInfo
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- CN104497777B CN104497777B CN201410720428.3A CN201410720428A CN104497777B CN 104497777 B CN104497777 B CN 104497777B CN 201410720428 A CN201410720428 A CN 201410720428A CN 104497777 B CN104497777 B CN 104497777B
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- C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
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- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
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Abstract
The invention provides a kind of room-temperature self-crosslinking water-based coating and its production and use.This coating has high rigidity, high scrub resistance and good diffuse-reflectance performance.Coating preparation process: utilize the silane coupler containing unsaturated double-bond that alkaline silica sol is carried out graft modification, obtain the surface nano silicon with unsaturated double-bond；With nano silicon as seed, in the presence of initiator, acrylic ester monomer is mixed with epoxy resin, utilizes semi-continuous seed emulsion polymerization technique to prepare epoxy resin and the dual modified room temperature self-crosslinking acrylic ester emulsion with nucleocapsid structure of inorganic particulate；With above-mentioned emulsion as base material, add delustering agent, glass dust, extender pigment, coating additive etc., prepare room-temperature self-crosslinking water-based coating.This coating application can be used simultaneously as the clipboard of water stump and the projection screen of projector in metope or plate face, the problem that solve board of education and the separate setting of projection screen in prior art, can not simultaneously use.
Description
Technical field
The present invention relates to coating, particularly belong to a kind of room-temperature self-crosslinking water-based coating, this coating application, can in indoor wall
Being used simultaneously as clipboard and the projection screen of water stump, integration needs are write and projected to satisfied modern classroom, meeting room.
Background technology
At present, in university, middle school or primary school classroom teaching, typically there is one piece of fixing board of education on the wall for teacher
Writing on the blackboard.The generally size of board of education has standard to specify, height is no less than 1000mm.Width: primary school is the most preferably less than
3600mm, middle school is not preferably less than 4000mm.Along with the vertical dimension saying table top under blackboard: primary school is preferably 800-900mm；Middle school is suitable
For 1000-1100mm.Owing to board of education has fixing frame and the most immovable, teacher near board of education top edge or
When lower limb is write the most inconvenient.Along with the development of multimedia technology, the same of fixing board of education is being installed in current most of classrooms
Time be equipped with roll type projection screen, for projector play multimedia.Projection screen and board of education are separate, need to play
During multimedia, projection screen puts down, and now part clipboard can be blocked, and hinders normal writing on the blackboard；When needing to write in a large number, projection screen
Can only pack up, expose the clipboard blocked, cause the most again multimedia to play.Therefore, the teaching that displaying limit in limit is write is wanted
Ask and be not being met.Additionally, rolling and putting down of curtain is required for the plenty of time, brings very big inconvenience to teaching, have impact on
Quality of instruction.To this end, the patented invention of Publication No. CN203317958U one writes the dual-purpose board of education of projection.Although this
The bright dual-purpose board of education of projection of writing has concentrated the function write and project, and two kinds of functions can be used alone, it is to avoid pass
System the putting down and rolling of projection screen, but, this invention the most simply will have the curtain of projecting function and has and writes merit
The board of education of energy is brought together by structure design, in using or realizes respectively on two boards, and structure is complicated, making
Cost is high.The utility model patent of Publication No. CN201662681U devises the projection screen that a kind of wide viewing angle can be write, and this throws
Shadow curtain is formed by 4～5 layers, and every layer material is different, it is possible to achieve project and write two kinds of functions.But the multiple structure of this projection screen
Make its production process complicated, relatively costly, and its product form is curtain, does not has firm backing material behind, to being write
Bring huge inconvenience.
The room-temperature self crosslinking interior wall coating can write after brushing and can project must have the highest hardness, the most resistance to
Scrub the feature such as performance, resistance to water, to meet the requirement repeatedly write and wipe of metope；Must also have the strongest overflowing simultaneously
Reflection function, so that metope meets the needs of projection.Meanwhile, in order to meet needs easy and simple to handle and environmental protection, this coating also must
Must have room-temperature self crosslinking and without features such as organic volatiles.Existing special about sub-optical coating and room-temperature self crosslinking coating
Profit is a lot, and such as publication number is respectively as follows: CN102585618A, the patent application etc. of CN102977765A, CN1908022A.But
It is that disclosed in these patent documentations, its hardness of coating, wash-resistant property, resistance to water etc., be not met by write and throwing
The needs of shadow.
Summary of the invention
It is an object of the invention to provide a kind of room-temperature self-crosslinking water-based coating, this coating application, can be same in indoor wall
Time be used as the clipboard of water stump and projection screen, write and project the needs of integration with satisfied modern classroom, meeting room.
The object of the present invention is achieved like this:
A kind of room-temperature self-crosslinking water-based coating, it is characterised in that component according to the mass fraction:
Described modified acrylate emulsion is prepared by a method comprising the following steps and obtains:
(1), prepared by modified manometer silicon dioxide: added by alkaline silica sol in reactor, by Silane coupling reagent KH-570
Dissolve in ethanol, wiring solution-forming, under the conditions of constant temperature 70 DEG C, in 30min, KH-570 ethanol solution is added drop-wise in reactor, stirs
Mix reaction 12h, sucking filtration, washing with alcohol, after drying, obtain the modified manometer silicon dioxide that double bond is contained on surface；In alkaline silica sol
SiO2, the mass ratio of Silane coupling reagent KH-570 and ethanol be 10 1-1.5 10；
(2), the preparation of composite emulsifying agent solution: OP-10 and dodecylbenzene sodium sulfonate (DBS) in mass ratio 21 are joined
Become compound emulsifying agent, the compound emulsifying agent of 3.5-5 mass parts is dissolved in the deionized water of 150 mass parts；
(3), the preparation of initiator solution: described initiator is Ammonium persulfate. (APS) or potassium peroxydisulfate (KPS), will
The initiator of 0.7-1.2 mass parts is dissolved in the water of 60 mass parts；
(4), the preparation of core pre-emulsion: in parts by mass by the methyl methacrylate of 20-26, the acrylic acid fourth of 19-25
Ester, the styrene of 1-2, epoxy resin (E-44) mix homogeneously of 7-15, it is added drop-wise in the composite emulsifying agent solution of 50 mass parts,
High-speed stirred 1 hour at 55 DEG C, prepares milky core pre-emulsion；
(5), the preparation of shell pre-emulsion: in parts by mass by the methyl methacrylate of 28-34, the acrylic acid fourth of 29-36
Ester, the acrylamide of 2-5, the n-methylolacrylamide of 2.5-6, the N-[2-(2-methyl-4-oxopentyl) mix homogeneously of 2.5-6, it is added drop-wise to 50
In the composite emulsifying agent solution of mass parts, high-speed stirred 1 hour at 55 DEG C, prepare milky shell pre-emulsion；Shell introduces
Water-soluble monomer acrylamide, n-methylolacrylamide and N-[2-(2-methyl-4-oxopentyl), can make emulsion particle preferably divide in water
Dissipate, increase emulsion intercalation method.The acrylamide, n-methylolacrylamide and the N-[2-(2-methyl-4-oxopentyl) that introduce in shell also simultaneously
, can crosslink with epoxy resin after the moisture of emulsion evaporates as the firming agent of stratum nucleare epoxy resin, thus significantly
Improve hardness of paint film.
(6), the synthesis of modified acrylate emulsion: in the composite emulsifying agent solution of 50 mass parts, add 0.5-2 mass
The buffer agent of part and the modified manometer silicon dioxide of 12-19 mass parts, after being warming up to 50 DEG C of strong stirring 30min, in 15min
The 1/3 of the initiator solution that 1/10 and the step (3) of core pre-emulsion step (4) obtained obtains is slowly dropped into, and is warming up to
80 DEG C are continued reaction 15min, treat emulsion blueing, keep reaction temperature 80 DEG C, be slowly added dropwise remaining core pre-emulsion in 1.5h
Initiator solution with 1/3, is warming up to 85 DEG C of insulation 1h, obtains core emulsion；It is cooled to 80 DEG C, dropping shell pre-emulsion and remaining
Initiator solution, time for adding 1.5h, after dripping, it is warming up to 85 DEG C of insulation 1.5h；It is cooled to 40 DEG C, dropping ammonia regulation pH
To 8, add adipic dihydrazide (ADH) and triethylene four ammonium of 1-2 mass parts of room temperature crosslinking agent 1-4 mass parts, stirring
With the strainer filtering of 100 mesh after 10min, prepare the modified acrylate emulsion of nucleocapsid structure.
Flatting silica of the present invention is the silicon dioxide that surface is treated, and its effect is at the abrasion resistance improving paint film
While increase the diffuse-reflectance of paint film, meet the paint film demand for projection.
Described glass dust is the treated glass dust in surface, and preferable particle size is 3-5 μm, and its effect is to increase paint film
Diffusive intensity, makes projection affect visible angle and increases.
Described extender pigment is one or both combinations in precipitated calcium carbonate, titanium dioxide and iron oxide yellow pigments.
The preparation method of a kind of room-temperature self-crosslinking water-based coating of the present invention, including following preparation process: according to upper
State proportioning, by the defoamer high-speed stirred mix homogeneously in the reactor of modified acrylate emulsion, deionized water and 1/2, so
After be sequentially added into flatting silica, glass dust, extender pigment, coalescents, thickening agent and antifungus agent, high-speed stirred mix homogeneously, so
Rear addition levelling agent and remaining defoamer stirring at low speed are uniform, i.e. obtain room-temperature self-crosslinking water-based coating.
The room-temperature self-crosslinking water-based coating of the present invention has high rigidity, high scrub resistance and good diffuse-reflectance performance, brushing
It is used simultaneously as the clipboard of water stump and the projection screen of projector in metope or plate face, writes with satisfied modern classroom, meeting room
Needs with projection integration.This coating also can be applied in indoor and outdoor are decorated.
Emulsion particle, by the proportioning in nuclear shell in the monomer of regulation different glass temperature, is designed to stone by the present invention
The structure of soft shell, meanwhile, introduces the epoxy resin of high rigidity in core and nanometer silicon dioxide particle can make the paint after crosslinking
Film has extraordinary scratch resistance.The present invention adds two kinds of cross-linking agent, when emulsion moisture evaporate after, ADH can with in shell
N-[2-(2-methyl-4-oxopentyl) crosslink, form fine and close tridimensional network, n-methylolacrylamide and triethylene four simultaneously
There is profound crosslinking with epoxy resin in amine, improves consistency and the hardness of paint film further.
Reactant involved in the present invention and reaction principle are as follows:
(1), reactant
(1) methacryloxypropyl trimethoxy silane
Molecular formula: CH2=C (CH3)COO(CH2)3Si(OCH3)3
The place of production: dawn chemical plant, Nanjing
(2) Ludox
Molecular formula: SiO2·nH2O
The place of production: Shanghai Chemical Co., Ltd. of Hang Seng, N-30, SiO2Content 30%
(3) epoxy resin
Molecular structural formula:
R:
The place of production: Jinan Chang Hua resin Chemical Co., Ltd.
(4) emulsifying agent
<i>. OPEO (OP-10)
Molecular formula: C8H17C6H4O(CH2CH2O)10H
The place of production: Tianjin Fu Yu Fine Chemical Co., Ltd
<ii>. dodecylbenzene sodium sulfonate
Molecular formula: C18H29NaO3S
The place of production: 5-linked chemical plant, Shanghai
(5) acrylate and polymerization monomer
<i>. methyl methacrylate, molecular formula: CH2=C (CH3)COOCH3
<ii>. butyl acrylate, molecular formula: CH2=CHCOO (CH2)3CH3
<iii>. styrene, molecular formula: CH2=CHC6H5
<iv>. acrylamide, molecular formula: CH2=CHCONH2
<v>. n-methylolacrylamide, molecular formula: CH2=CHCONHCH2OH
The place of production is Feng Le Chemical Co., Ltd..
<vi>. N-[2-(2-methyl-4-oxopentyl)
Molecular formula: CH2=CHCONHC (CH3)2CH2COCH3
The place of production: Jinan Chemical Co., Ltd. of Yunxiang
(6) cross-linking agent
<i>. triethylene tetramine
Molecular formula: NH2(CH2)2NH(CH2)2NH(CH2)2NH2
The place of production: Feng Le Chemical Co., Ltd.
<ii>. adipic dihydrazide
Molecular formula: NH2NHCO(CH2)4CONHNH2
The place of production: Jinan Tai Hua Chemical Co., Ltd.
(7) light modulation auxiliary agent
<i>. glass dust, model: B-3500, manufacturer: Shijiazhuang Ren Xin company limited
<ii>. titanium dioxide, model: R931, manufacturer: Du Pont's chemical industry
<iii>. flatting silica, model: OK520, manufacturer: Degussa
(2), chemical equation and reaction principle
(1) silica sol modified
(2) epoxy resin modification
(3) the room-temperature self crosslinking reaction related to
The room-temperature self crosslinking reaction that<i>.DAAM participates in
Above-mentioned reaction is that the acrylic acid ester emulsion containing ketone carbonyl crosslinks reaction with the compound with hydrazide group
Situation, has water to generate in course of reaction, this reaction will not occur in emulsion, at room temperature the process of acrylic acid ester emulsion film forming
In, along with the volatilization of moisture, cross-linking reaction is gradually carried out, and is very suitable for self-crossing emulsion system.
<ii>. the cross-linking reaction that epoxy resin participates in
Epoxy resin is the reaction that just can carry out under room temperature with the reaction of triethylene tetramine, but owing to there being the generation of water, this
Reaction can not be carried out under emulsion state, and along with evaporation of water, the formation of acrylate films, this reaction will be entered easily
OK, make to crosslink between acrylate polymeric chain.
Advantages of the present invention and beneficial effect:
The present invention combines nanotechnology and self-crosslinking technology, obtains using pre-emulsification and semi-continuous seed emulsion polymerization method
The room temperature self-crosslinking acrylic ester emulsion with nucleocapsid structure carried out nano silicon and epoxy resin is dual modified, be coated with
In material, N-[2-(2-methyl-4-oxopentyl) and epoxy resin can realize self-crosslinking, the cross-linked network density formed when moisture evaporates simultaneously
Higher, there is high rigidity, high scrub resistance and good diffuse-reflectance performance, can make with the whole metope of this water paint brushing
For teaching plate for writing and projection screen, it is achieved classroom, office and family freely project and arbitrarily write picture；Solve existing skill
Board of education and the separate setting of projection screen in art, it is impossible to the problem simultaneously used.
This invention coating with water as solvent, have health, environmental protection, without organic volatile pollute advantage；
This invention coating is one-component coating, can construct simple, convenient with room-temperature self crosslinking；
Emulsion used by this invention coating is core-shell emulsion, and emulsion particle diameter is little, and storage stability is good, and film-forming temperature is low；
Classroom construction cost can be substantially reduced for teaching writing and projection with the coating application classroom metope of this invention.
Accompanying drawing explanation
Accompanying drawing 1 is the preparation technology flow chart of modified acrylate emulsion of the present invention
Accompanying drawing 2 is the present invention room-temperature self-crosslinking water-based Paint preparation technology flow chart
Detailed description of the invention
The preparation method of the present invention is expanded on further below in conjunction with the accompanying drawings with specific embodiment.Specific embodiment is the most right
Scope constitutes any type of any restriction.
Embodiment 1
(1), prepared by modified manometer silicon dioxide
90g technical grade alkaline silica sol is added in reactor, 4g Silane coupling reagent KH-570 is dissolved in 27g ethanol
In, wiring solution-forming, under the conditions of constant temperature 70 DEG C, in 30min, KH-570 ethanol solution is added drop-wise in reactor, stirring reaction
12h, sucking filtration, washing with alcohol, obtain surface after drying and contain modified manometer silicon dioxide.
(2), the synthesis of dual modified room temperature self-crosslinking acrylic ester emulsion
3.7g Surfactant OP-10 and 1.8g surfactant D BS is dissolved in 150g deionized water, prepares compound
Emulsifier solution, standby.
0.9gAPS is dissolved in 60ml deionized water, prepares initiator solution, standby.
Modified acrylate emulsion mainly comprises as follows:
The table 3. nucleocapsid each amounts of components of two-layer pre-emulsion
Modified acrylate emulsion is prepared as shown in Figure 1, comprises the following steps that,
Nuclear monomer and shell monomer are pressed upper table proportioning mix homogeneously respectively, is slowly dropped to 50g compound emulsifying agent respectively molten
In liquid, high-speed stirred 1 hour at 55 DEG C, prepare milky core and the pre-emulsion of shell.
The composite emulsifying agent solution of 50 mass parts adds 1g buffer agent NaHCO3With 18g modified manometer silicon dioxide, rise
20g initiator solution, to 50 DEG C of strong stirring 30min, is added drop-wise in reactor in 15min after adding 11g core pre-emulsion by temperature,
Being warming up to 80 DEG C, continue reaction 15min, treat emulsion blueing light, keep reaction temperature, 1.5h has been slowly added dropwise the pre-breast of remaining core
Liquid and 20g initiator solution, be warming up to 85 DEG C of insulation 1h, obtain stratum nucleare emulsion.It is cooled to 80 DEG C, dropping shell pre-emulsion and residue
Initiator solution, time for adding 1.5h, after dripping, be warming up to 85 DEG C, be incubated 1.5h.Being cooled to 40 DEG C, dropping ammonia is adjusted
Joint pH to 8, adds 2.5g ADH, with the strainer filtering of 100 mesh after stirring 10min, prepares the modification acrylate of nucleocapsid structure
Emulsion.Solid content about 48.0%, residual monomer content is less than 0.1%, and gel fraction is less than 0.5%.
(3), the preparation of room-temperature self-crosslinking water-based coating
The embodiment 1 that the composition of room-temperature self-crosslinking water-based coating is shown in Table in 1.Corresponding component is weighed by the formula in table 1,
Press the process chart of accompanying drawing 2 in the reactor, by the defoamer of modified acrylate emulsion, deionized water and 1/2 in reaction
Device high speed is uniformly mixed, and is then sequentially added into flatting silica, glass dust, extender pigment, coalescents, thickening agent and mildew-resistant
Agent, high-speed stirred mix homogeneously, is subsequently adding levelling agent and remaining defoamer stirring at low speed is uniform, i.e. obtains room-temperature self crosslinking
Water paint.
(4) performance test with compare
Table 1 is that to use the dual modified acrylic acid ester emulsion prepared of the present invention be Main Components, adds other coating additives
The constituent table of formula i.e. embodiment 1 and comparative example；
Table 2 is the performance test results contrast of coating i.e. the embodiment 1 and comparative example using present invention preparation.
Table 1 coating constituent table
Table 2 the performance test results
Claims (7)
1. a room-temperature self-crosslinking water-based coating, it is characterised in that component according to the mass fraction:
Described modified acrylate emulsion is prepared by a method comprising the following steps and obtains:
(1), prepared by modified manometer silicon dioxide: is added by alkaline silica sol in reactor, is dissolved by Silane coupling reagent KH-570
In ethanol, wiring solution-forming, under the conditions of constant temperature 70 DEG C, in 30min, KH-570 ethanol solution is added drop-wise in reactor, stirring is anti-
Answer 12h, sucking filtration, washing with alcohol, after drying, obtain the modified manometer silicon dioxide that double bond is contained on surface；In alkaline silica sol
SiO2, the mass ratio of Silane coupling reagent KH-570 and ethanol be 10 1-1.5 10；
(2), the preparation of composite emulsifying agent solution: OP-10 and dodecylbenzene sodium sulfonate (DBS) in mass ratio 21 are made into multiple
Co-emulsifier, is dissolved in the compound emulsifying agent of 3.5-5 mass parts in the deionized water of 150 mass parts；
(3), the preparation of initiator solution: described initiator is Ammonium persulfate. (APS) or potassium peroxydisulfate (KPS), by 0.7-1.2
The initiator of mass parts is dissolved in the water of 60 mass parts；
(4), the preparation of core pre-emulsion: in parts by mass by the methyl methacrylate of 20-26, the butyl acrylate of 19-25,1-
The styrene of 2, the epoxy resin E-44 mix homogeneously of 7-15, it is added drop-wise in the composite emulsifying agent solution of 50 mass parts, at 55 DEG C
Lower high-speed stirred 1 hour, prepares milky core pre-emulsion；
(5), the preparation of shell pre-emulsion: in parts by mass by the methyl methacrylate of 28-34, the butyl acrylate of 29-36,2-
The acrylamide of 5, the n-methylolacrylamide of 2.5-6, the N-[2-(2-methyl-4-oxopentyl) mix homogeneously of 2.5-6, it is added drop-wise to 50 mass
In the composite emulsifying agent solution of part, high-speed stirred 1 hour at 55 DEG C, prepare milky shell pre-emulsion；
(6), the synthesis of modified acrylate emulsion: in the composite emulsifying agent solution of 50 mass parts, add 0.5-2 mass parts
Buffer agent and the modified manometer silicon dioxide of 12-19 mass parts, after being warming up to 50 DEG C of strong stirring 30min, will step in 15min
The 1/3 of the initiator solution that 1/10 and the step (3) of the core pre-emulsion that (4) obtain suddenly obtains is slowly dropped into, and is warming up to 80 DEG C
Continue reaction 15min, treat emulsion blueing, keep reaction temperature 80 DEG C, in 1.5h, be slowly added dropwise remaining core pre-emulsion and 1/3
Initiator solution, be warming up to 85 DEG C insulation 1h, obtain core emulsion；It is cooled to 80 DEG C, dropping shell pre-emulsion and remaining initiation
Agent solution, time for adding 1.5h, after dripping, it is warming up to 85 DEG C of insulation 1.5h；It is cooled to 40 DEG C, dropping ammonia regulation pH to 8,
Add adipic dihydrazide (ADH) and the triethylene tetramine of 1-2 mass parts of room temperature crosslinking agent 1-4 mass parts, after stirring 10min
With the strainer filtering of 100 mesh, prepare the modified acrylate emulsion of nucleocapsid structure.
A kind of room-temperature self-crosslinking water-based coating the most as claimed in claim 1, it is characterised in that described flatting silica is through surface
The silicon dioxide processed.
A kind of room-temperature self-crosslinking water-based coating the most as claimed in claim 1, it is characterised in that described glass dust is through table
The glass dust that face processes, particle diameter is 3-5 μm.
A kind of room-temperature self-crosslinking water-based coating the most as claimed in claim 1, it is characterised in that described extender pigment is lightweight
One or both in calcium carbonate, titanium dioxide and iron oxide yellow pigments.
The preparation method of a kind of room-temperature self-crosslinking water-based coating the most as claimed in claim 1, it is characterised in that include following step
Rapid: by the defoamer high-speed stirred mix homogeneously in the reactor of modified acrylate emulsion, deionized water and 1/2, then to depend on
Secondary addition flatting silica, glass dust, extender pigment, coalescents, thickening agent and antifungus agent, high-speed stirred mix homogeneously, then add
Enter levelling agent and remaining defoamer stirring at low speed is uniform, i.e. obtain room-temperature self-crosslinking water-based coating.
A kind of room-temperature self-crosslinking water-based coating the most as claimed in claim 1 application in clipboard and projection screen.
A kind of room-temperature self-crosslinking water-based coating the most as claimed in claim 1 application in indoor and outdoor are decorated.
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| CN1155638C (en) * | 2001-06-20 | 2004-06-30 | 山东大学 | Composite epoxy-modified acrylic acid-polyurethane emulsion and its prepn. process |
| US8758894B2 (en) * | 2010-04-09 | 2014-06-24 | Nanofilm, Ltd. | Fog and abrasion resistant hardcoat for plastics having hydrophilic surfactant rich surface portion with surfactant concentration gradient |
| CN102358810B (en) * | 2011-09-14 | 2015-04-01 | 哈尔滨大东方卷烟材料科技开发有限责任公司 | Environment-friendly type water-based intaglio ink used for package printing and preparation method thereof |
| CN103773182B (en) * | 2014-01-23 | 2016-09-14 | 安徽师范大学 | A kind of powdery paints with high surface hardness and levelability |
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