CN106032449B - A kind of dumb light finishing varnish and its preparation process - Google Patents
A kind of dumb light finishing varnish and its preparation process Download PDFInfo
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Abstract
The invention proposes a kind of dumb light finishing varnish and its preparation processes, belong to stone-like coating field.The raw material of dumb light finishing varnish includes: deionized water 25-40% according to weight percent, dispersing agent 0-0.2%, wetting agent 0.05-0.1%, quenching matter 2.5-6%, defoaming agent 0.1-0.2%, lotion 50-65%, coalescing agent 2-5%, fungicide 0.1-0.3%, anti-fouling agent 1-6%, thickener 0.2-0.5%.Its preparation process, comprising the following steps: sequentially add raw material according to formula in mixing tank and obtain mixture；After the mixture is vacuumized bubble removing again, thickener is added, obtains the dumb light finishing varnish.Dumb light finishing varnish of the invention not only can easily take away pollutant, but also can reach hydrophilic self-cleaning effect to avoid the generation of rainprint problem.
Description
Technical field
The present invention relates to stone-like coating field, a kind of dumb light finishing varnish and its preparation process are particularly related to.
Background technique
Currently, stone class coating (lacquer, sliver paint etc.) is imitated after spraying, and surface is all more coarse, is coating
After dumb light finishing varnish, that had not only played the role of cover agent should have, but also energy surface goes out the texture surface of stone material, and people is given to feel Piao
Element, low-key, generous feeling.And the coating surface of imitative stone class, granular sensation is more obvious, is easy accumulation dust.
Existing finishing varnish is after emulsion film forming, and the polymer type coating majority of formation is hydrophobic film, due to sky
There are many medium oil pollutants of non-natural pollutant, especially atmosphere pollution in gas to gradually increase, they can be adsorbed on
It polymerize the surface of the hydrophobic film of species, is difficult to take away by rain drop erosion, is easy to leave ugly rainprint.
Summary of the invention
The present invention proposes a kind of dumb light finishing varnish and its preparation process, solves above-mentioned existing dumb light finishing varnish and is easy
Dust is adsorbed, the problem of cleaning is not easy.
The technical scheme of the present invention is realized as follows:
A kind of dumb light finishing varnish, raw material include: deionized water 25-40%, dispersing agent 0- according to weight percent
0.2%, wetting agent 0.05-0.1%, quenching matter 2.5-6%, defoaming agent 0.1-0.2%, lotion 50-65%, coalescing agent 2-
5%, fungicide 0.1-0.3%, anti-fouling agent 1-6%, thickener 0.2-0.5%；The anti-fouling agent is type siloxane and its derivative
Object, the hydroxy that it is formed in the film forming procedure of coating on surface, so that film has hydrophily；The quenching matter be with
Hollow silica is carrier, and polyolefins substance is wrapped up on surface.
The invention further relates to the preparation processes of above-mentioned dumb light finishing varnish, comprising the following steps: a, according to weight percent,
Deionized water, dispersing agent, wetting agent are sequentially added in mixing tank, carry out first time stirring；It adds quenching matter, carries out the
Then secondary agitation improves mixing speed, carry out third time stirring, make the abundant wetting and dispersing of quenching matter；The quenching matter
To wrap up polyolefins substance on its surface using hollow silica as carrier；B, it adjusts revolving speed and carries out the 4th stirring, it will
Defoaming agent is added in the system of step a, until foam is not seen on surface；Sequentially add lotion, coalescing agent, sterilization
Agent, anti-fouling agent, are added while stirring, adjust revolving speed and carry out the 5th stirring；The anti-fouling agent be type siloxane and its derivative,
The hydroxy that it is formed in the film forming procedure of coating on surface, so that film has hydrophily；Obtain mixture；It c, will be described
After mixture vacuumizes bubble removing, thickener is added while stirring, obtains the dumb light finishing varnish.
The invention has the benefit that
1, the present invention is using type siloxane and its derivative as anti-fouling agent, it is in the film forming procedure of coating in surface shape
At hydroxy so that film has hydrophily, and the oiliness pollutant in air is not easy to adhere in hydrophilic film coated surface, and
Rainwater has good wetability in hydrophilic film coated surface, it is easy to which drawout forms moisture film, not only can easily take away pollution
Object, but also hydrophilic self-cleaning effect can be reached to avoid the generation of rainprint problem.
2, using general silica class flatting silica, after long-time storage, apparent precipitating can be generated, in contrast, this
Inventing the quenching matter used is to do Lasaxing Oilfield on its surface using hollow silica as carrier, and the wax wrapped up is polyene
Hydro carbons, surface are especially handled, and are easy dispersion；Its density is in 0.95-1.05g/cm3Between, it can be mixed with components such as water and lotions
It is even, apparent precipitating can not be had with even suspension wherein.
3, dumb light finishing varnish prepared by the present invention carries out following test, and performance indicator is as shown in table 1.
1) resistance to water-white test: coating it is resistance to it is water-white be examine water-resistant coating can important indicator, water-tolerant meet water it is constant
White, the bad chance water of water resistance is easy to bleach；Observation in 2 hours is impregnated after the coating film coated is sufficiently dried into the water to bleach
The case where.
2) by the dumb light finishing varnish film prepared in embodiment it is sufficiently dry after, according to standard method carry out water resistance,
Alkali resistance, acid rain resistant test, observe whether its test front and back has the abnormal conditions such as colour fading, rupture, blistering.
3) using roller coating (or spraying), the coating of preparation is coated on to smooth aluminium foil surface, in standard test conditions (temperature
Degree 23 ± 2 DEG C, relative humidity 50 ± 5%) under maintenance 168h film forming to get arrive print；Print is subjected to hydrophily test, test
Method is as follows:
1. initial hydrophily test: using contact angle of the contact angle instrument measurement water droplet when film coated surface sprawls 30 seconds；
2. hydrophily is tested after pollution: the print coated is used the pollution sources (examination of defined in GB/T 9780-2005
Test with pollution sources), and pollution sources are configured to pollution sources suspension according in GB/T 9780-2005 8.1, later according to GB/T
8.2.1.1 carries out pollution processing in 9780-2005, after five circulations, tests water droplet connecing when film coated surface sprawls 30 seconds
Feeler.
Table 1
| Project | Standard | Method | As a result | Remarks |
| Water resistance | GB/T 1733 | 96h | It is without exception | |
| Alkali resistance | GB/T 9265 | 48h | It is without exception | |
| Acid rain resistant test | GB/T 9274 | 48h | It is without exception | |
| Water-whitening resistance | The above method 1 | 2h | It is without exception | |
| Measurement of luster | Glossometer test | 60 degree of tests | 10-30Gu | Quenching matter is more, and gloss is smaller |
| Initial hydrophilic angle | Contact angle instrument | The above method is 1. | ≤10° | |
| Hydrophilic angle after pollution | Contact angle instrument | The above method is 2. | ≤25° |
Specific embodiment
The technical scheme in the embodiments of the invention will be clearly and completely described below, it is clear that described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
Technical staff's every other embodiment obtained without creative efforts belongs to the model that the present invention protects
It encloses.
Dumb light finishing varnish in embodiment, raw material include: deionized water 25-40%, dispersing agent according to weight percent
0-0.2%, wetting agent 0.05-0.1%, quenching matter 2.5-6%, defoaming agent 0.1-0.2%, lotion 50-65%, coalescing agent
2-5%, fungicide 0.1-0.3%, anti-fouling agent 1-6%, thickener 0.2-0.5%.
Anti-fouling agent is type siloxane and its derivative in embodiment, such as DOW CORNING DC193, vapour bar chemistry
IRGASURFTMHL560, Nantong mahatma weaving DF-121, this chemistry of Chinese Hans/Qs etc.；Quenching matter is with hollow titanium dioxide
Silicon is carrier, wraps up polyolefins substance, polyolefins substance such as Lu Borun chemical industry liquiMatt 6375, the U.S. on its surface
Miami Matt920 etc.；Lotion is pure-acrylic emulsion (such as Showa chemical industry AP4690, AP4765, TL-1143 or Ahmedabad richness RS-706T
Deng), compound emulsion one or two kinds of in silicone acrylic emulsion (such as Ahmedabad richness RS-3788, RS-996AD, RS-996KD etc.)；Dispersion
Agent is the dispersing agent of ammonium salt class, such as Dow Orotan1124, nopco SN-5027 etc.；The wetting agent is poly- without alkyl phenol
The wetting agent of ethylene oxide ether compound (abbreviation APEO), such as Clariant LCN407, BasfWE 3111 etc.；
The coalescing agent is alcohol ester 12, mixture one or two kinds of in butyl carbitol；The thickener is polyurethanes increasing
Thick dose of (such as DOW RM-8W, Basf Rheovis pu1291, Basf Rheovis pu1191, SN-621N etc.), hydrophobically modified
One or two kinds of mixing in alkali soluble is swollen class thickener (such as Basf Rheovis HS 1152, DOW ACRYSOL DR-73 etc.)
Object.
Defoaming agent is the dedicated defoaming agent of hydrophilic coating in embodiment, such as Nippon Nopco Assistant Co., Ltd. SN-
Defoamer 327, Basf formstar A10, bright icepro AGITAN A221 of Germany etc..Fungicide is that this field is normal in embodiment
With fungicide, such as THOR ACTICIDE EPW, THOR ACTICIDE HF, Clariant CI15MV etc..
The invention further relates to the preparation processes of above-mentioned dumb light finishing varnish, comprising the following steps:
A, according to weight percent, deionized water, dispersing agent, wetting agent are sequentially added in mixing tank, are carried out for the first time
Stirring；Quenching matter is added, second is carried out and stirs, then improve mixing speed, carry out third time stirring, make quenching matter
Abundant wetting and dispersing；
B, it adjusts revolving speed and carries out the 4th stirring, defoaming agent is added in the system of step a, until surface is invisible
Foam；Lotion, coalescing agent, fungicide, anti-fouling agent are sequentially added, is added while stirring, adjusting revolving speed carries out the 5th time and stirs
It mixes；Obtain mixture；
C, after the mixture being vacuumized bubble removing, thickener is added while stirring, obtains the dumb light finishing varnish.
Preferably, the addition of raw material must sequentially add in sequence in embodiment, otherwise be easy to appear quenching matter dispersion
Phenomena such as uneven, be easy to cause finishing varnish surface to have little particle, influences apparent effect.
Preferably, the revolving speed of stirring is 100-200r/m, mixing time 5min for the first time；The revolving speed of stirring is for the second time
100-200r/m, mixing time 10min；The revolving speed of third time stirring is 200-350r/m, mixing time 25-30min；4th time
The revolving speed of stirring is 200-250r/m；The revolving speed of 5th stirring is 300-350r/m, mixing time 15-25min.
Preferably, in step c, in vacuum, vacuum degree is -70~-80KPa, and the time vacuumized is 15-20 points
Clock.
The proportion of above-mentioned each raw material is different, may be constructed different embodiments, specific as follows.
Embodiment 1
A kind of dumb light finishing varnish, raw material include: deionized water 25% according to weight percent, and wetting agent 0.1% disappears
Stimulative substance 5%, defoaming agent 0.2%, lotion 59%, coalescing agent 4%, fungicide 0.2%, anti-fouling agent 6%, thickener 0.5%.
The preparation method of above-mentioned dumb light finishing varnish the following steps are included:
A, according to weight percent, deionized water, dispersing agent, wetting agent are sequentially added, in mixing tank with 100-200r/
M stirs 5min；Quenching matter is added, 10min is stirred with 100-200r/m, after waiting quenching matters substantially to soak, then with 200-
350r/m is dispersed with stirring 25-30 minutes, makes the abundant wetting and dispersing of quenching matter；
B, revolving speed is adjusted to 200-250r/m, defoaming agent is added in the system of step a, until the invisible bubble in surface
Foam；Lotion, coalescing agent, fungicide, anti-fouling agent are sequentially added, is added while stirring, continues to stir 15- with 300-350r/m
25 minutes；Obtain mixture；
C, after mixture being vacuumized bubble removing, thickener is added while stirring, obtains dumb light finishing varnish.
Dumb light finishing varnish manufactured in the present embodiment, performance indicator are as shown in table 2.
Table 2
| Project | Standard | Method | As a result | Remarks |
| Water resistance | GB/T 1733 | 96h | It is without exception | |
| Alkali resistance | GB/T 9265 | 48h | It is without exception | |
| Acid rain resistant test | GB/T 9274 | 48h | It is without exception | |
| Water-whitening resistance | Method 1 | 2h | It is without exception | |
| Measurement of luster | Glossometer test | 60 degree of tests | 14Gu | Quenching matter is more, and gloss is smaller |
| Initial hydrophilic angle | Contact angle instrument | Method is 1. | 5° | |
| Hydrophilic angle after pollution | Contact angle instrument | Method is 2. | 18° |
Embodiment 2
A kind of dumb light finishing varnish, raw material include: deionized water 40.5% according to weight percent, dispersing agent 0.2%,
Wetting agent 0.1%, quenching matter 3.2%, defoaming agent 0.1%, lotion 50%, coalescing agent 2.4%, fungicide 0.1% are antifouling
Agent 3%, thickener 0.4%.
The preparation method of above-mentioned dumb light finishing varnish the following steps are included:
A, according to weight percent, deionized water, dispersing agent, wetting agent are sequentially added, in mixing tank with 100-200r/
M stirs 5min；Quenching matter is added, 10min is stirred with 100-200r/m, after waiting quenching matters substantially to soak, then with 200-
350r/m is dispersed with stirring 25-30 minutes, makes the abundant wetting and dispersing of quenching matter；
B, revolving speed is adjusted to 200-250r/m, defoaming agent is added in the system of step a, until the invisible bubble in surface
Foam；Lotion, coalescing agent, fungicide, anti-fouling agent are sequentially added, is added while stirring, continues to stir 15- with 300-350r/m
25 minutes；Obtain mixture；
C, after mixture being vacuumized bubble removing, thickener is added while stirring, obtains dumb light finishing varnish.
Dumb light finishing varnish manufactured in the present embodiment, performance indicator are as shown in table 3.
Table 3
| Project | Standard | Method | As a result | Remarks |
| Water resistance | GB/T 1733 | 96h | It is without exception | |
| Alkali resistance | GB/T 9265 | 48h | It is without exception | |
| Acid rain resistant test | GB/T 9274 | 48h | It is without exception | |
| Water-whitening resistance | Method 1 | 2h | It is without exception | |
| Measurement of luster | Glossometer test | 60 degree of tests | 20Gu | Quenching matter is more, and gloss is smaller |
| Initial hydrophilic angle | Contact angle instrument | Method is 1. | 7° | |
| Hydrophilic angle after pollution | Contact angle instrument | Method is 2. | 21° |
Embodiment 3
A kind of dumb light finishing varnish, raw material include: deionized water 26% according to weight percent, and wetting agent 0.1% disappears
Stimulative substance 2.5%, defoaming agent 0.1%, lotion 65%, coalescing agent 5%, fungicide 0.1%, anti-fouling agent 1%, thickener
0.2%.
The preparation method of above-mentioned dumb light finishing varnish the following steps are included:
A, according to weight percent, deionized water, dispersing agent, wetting agent are sequentially added, in mixing tank with 100-200r/
M stirs 5min；Quenching matter is added, 10min is stirred with 100-200r/m, after waiting quenching matters substantially to soak, then with 200-
350r/m is dispersed with stirring 25-30 minutes, makes the abundant wetting and dispersing of quenching matter；
B, revolving speed is adjusted to 200-250r/m, defoaming agent is added in the system of step a, until the invisible bubble in surface
Foam；Lotion, coalescing agent, fungicide, anti-fouling agent are sequentially added, is added while stirring, continues to stir 15- with 300-350r/m
25 minutes；Obtain mixture；
C, after mixture being vacuumized bubble removing, thickener is added while stirring, obtains dumb light finishing varnish.
Dumb light finishing varnish manufactured in the present embodiment, performance indicator are as shown in table 4.
Table 4
| Project | Standard | Method | As a result | Remarks |
| Water resistance | GB/T 1733 | 96h | It is without exception | |
| Alkali resistance | GB/T 9265 | 48h | It is without exception | |
| Acid rain resistant test | GB/T 9274 | 48h | It is without exception | |
| Water-whitening resistance | Method 1 | 2h | It is without exception | |
| Measurement of luster | Glossometer test | 60 degree of tests | 27Gu | Quenching matter is more, and gloss is smaller |
| Initial hydrophilic angle | Contact angle instrument | Method is 1. | 9° | |
| Hydrophilic angle after pollution | Contact angle instrument | Method is 2. | 25° |
Embodiment 4
A kind of dumb light finishing varnish, raw material include: deionized water 34%, dispersing agent 0.1%, profit according to weight percent
Humectant 0.05%, quenching matter 6%, defoaming agent 0.15%, lotion 52%, coalescing agent 3.1%, fungicide 0.3%, anti-fouling agent
4%, thickener 0.3%.
The preparation method of above-mentioned dumb light finishing varnish the following steps are included:
A, according to weight percent, deionized water, dispersing agent, wetting agent are sequentially added in mixing tank, after stirring；Again plus
Enter quenching matter, continue to stir, after waiting quenching matters substantially to soak, mixing speed is turned up and is stirred for, until quenching matter is abundant
Wetting and dispersing；
B, defoaming agent is added in the system of step a while stirring, stirring is not until foam is seen on surface；Again according to
Secondary addition lotion, coalescing agent, fungicide, anti-fouling agent, are added while stirring, and mixing speed stirring is finally turned up, is mixed
Material；
C, after mixture being vacuumized bubble removing, thickener is added while stirring, obtains dumb light finishing varnish.
Whipping process in embodiment is operated with means commonly used in the art.
Dumb light finishing varnish manufactured in the present embodiment, performance indicator are as shown in table 5.
Table 5
| Project | Standard | Method | As a result | Remarks |
| Water resistance | GB/T 1733 | 96h | It is without exception | |
| Alkali resistance | GB/T 9265 | 48h | It is without exception | |
| Acid rain resistant test | GB/T 9274 | 48h | It is without exception | |
| Water-whitening resistance | Method 1 | 2h | It is without exception | |
| Measurement of luster | Glossometer test | 60 degree of tests | 11Gu | Quenching matter is more, and gloss is smaller |
| Initial hydrophilic angle | Contact angle instrument | Method is 1. | 7° | |
| Hydrophilic angle after pollution | Contact angle instrument | Method is 2. | 22° |
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (8)
1. a kind of dumb light finishing varnish, which is characterized in that its raw material includes: deionized water 25-40% according to weight percent, point
Powder 0-0.2%, wetting agent 0.05-0.1%, quenching matter 2.5-6%, defoaming agent 0.1-0.2%, lotion 50-65%, film forming
Auxiliary agent 2-5%, fungicide 0.1-0.3%, anti-fouling agent 1-6%, thickener 0.2-0.5%；The anti-fouling agent be type siloxane and
Its derivative, the hydroxy that it is formed in the film forming procedure of coating on surface, so that film has hydrophily；The delustring object
Matter is using hollow silica as carrier, and polyolefins substance is wrapped up on surface.
2. dumb light finishing varnish according to claim 1, which is characterized in that the lotion is pure-acrylic emulsion, silicone acrylic emulsion
The compound emulsion of middle one or two.
3. dumb light finishing varnish according to claim 2, which is characterized in that the dispersing agent is the dispersing agent of ammonium salt class；
The wetting agent is the wetting agent without APEO；The coalescing agent is alcohol ester 12, one or two kinds of in butyl carbitol
Mixture；The thickener is polyurethanes thickener, hydrophobically-modified alkali is swollen mixture one or two kinds of in class thickener.
4. dumb light finishing varnish according to claim 3, which is characterized in that
Its raw material includes: deionized water 25%, wetting agent 0.1%, quenching matter 5%, defoaming agent according to weight percent
0.2%, lotion 59%, coalescing agent 4%, fungicide 0.2%, anti-fouling agent 6%, thickener 0.5%；Alternatively,
Its raw material includes: deionized water 26%, wetting agent 0.1%, quenching matter 2.5%, defoaming agent according to weight percent
0.1%, lotion 65%, coalescing agent 5%, fungicide 0.1%, anti-fouling agent 1%, thickener 0.2%；Alternatively,
Its raw material includes: deionized water 34%, dispersing agent 0.1%, wetting agent 0.05%, quenching matter according to weight percent
6%, defoaming agent 0.15%, lotion 52%, coalescing agent 3.1%, fungicide 0.3%, anti-fouling agent 4%, thickener 0.3%.
5. a kind of preparation process of dumb light finishing varnish, which comprises the following steps:
A, according to weight percent, deionized water 25-40%, dispersing agent 0-0.2%, wetting agent are sequentially added in mixing tank
0.05-0.1% carries out first time stirring；Quenching matter 2.5-6% is added, second is carried out and stirs, then improves stirring speed
Degree carries out third time stirring, makes the abundant wetting and dispersing of quenching matter；The quenching matter is using hollow silica as load
Body wraps up polyolefins substance on its surface；
B, it adjusts revolving speed and carries out the 4th stirring, defoaming agent 0.1-0.2% is added in the system of step a, until surface
Invisible foam；Sequentially add lotion 50-65%, coalescing agent 2-5%, fungicide 0.1-0.3%, anti-fouling agent 1-6%, institute
Stating anti-fouling agent is type siloxane and its derivative, is added while stirring, adjusts revolving speed and carries out the 5th stirring, the anti-fouling agent exists
The hydroxy formed in the film forming procedure of coating on surface, so that film has hydrophily；Obtain mixture；
C, after the mixture being vacuumized bubble removing, thickener 0.2-0.5% is added while stirring, obtains the dumb light cover
Varnish.
6. preparation process according to claim 5, which is characterized in that the revolving speed of the first time stirring is 100-200r/
M, mixing time 5min；The revolving speed of second of stirring is 100-200r/m, mixing time 10min；The third time stirring
Revolving speed be 200-350r/m, mixing time 25-30min；The revolving speed of 4th stirring is 200-250r/m；Described 5th
The revolving speed of secondary stirring is 300-350r/m, mixing time 15-25min；In step c, in vacuum, vacuum degree be -70~-
80KPa, the time vacuumized are 15-20min.
7. preparation process according to claim 5, which is characterized in that the lotion is pure-acrylic emulsion, one in silicone acrylic emulsion
Kind or two kinds of compound emulsion；The dispersing agent is the dispersing agent of ammonium salt class；The wetting agent is the wetting agent without APEO；Institute
Coalescing agent is stated as mixture one or two kinds of in alcohol ester 12, butyl carbitol；The thickener is polyurethanes thickening
One or two kinds of mixture in agent, hydrophobically-modified alkali swelling class thickener.
8. preparation process according to claim 7, which is characterized in that
Its raw material includes: deionized water 25%, wetting agent 0.1%, quenching matter 5%, defoaming agent according to weight percent
0.2%, lotion 59%, coalescing agent 4%, fungicide 0.2%, anti-fouling agent 6%, thickener 0.5%；Alternatively,
Its raw material includes: deionized water 26%, wetting agent 0.1%, quenching matter 2.5%, defoaming agent according to weight percent
0.1%, lotion 65%, coalescing agent 5%, fungicide 0.1%, anti-fouling agent 1%, thickener 0.2%；Alternatively,
Its raw material includes: deionized water 34%, dispersing agent 0.1%, wetting agent 0.05%, quenching matter according to weight percent
6%, defoaming agent 0.15%, lotion 52%, coalescing agent 3.1%, fungicide 0.3%, anti-fouling agent 4%, thickener 0.3%.
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| CN106883700A (en) * | 2017-03-06 | 2017-06-23 | 河北晨阳工贸集团有限公司 | A kind of dumb light finishing varnish |
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| CN110724421A (en) * | 2019-10-26 | 2020-01-24 | 苏州大乘环保新材有限公司 | Water-based tile anti-slip cover and preparation method and application thereof |
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| CN103468081A (en) * | 2013-08-14 | 2013-12-25 | 青岛益群漆业集团有限公司 | Nanometer glaring self-cleaning paint |
| CN104293037A (en) * | 2014-09-27 | 2015-01-21 | 安徽铁创新材料科技有限公司 | Low-gloss type environment-friendly top coating and preparation method thereof |
| CN104327655A (en) * | 2014-10-17 | 2015-02-04 | 广东三和化工科技有限公司 | Water-based air topcoat and preparation method thereof |
| CN104356936A (en) * | 2014-11-21 | 2015-02-18 | 苏州大乘环保建材有限公司 | High-performance hydrophobic finishing paint for outer walls |
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| CN106032449A (en) | 2016-10-19 |
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