CN1050734A - Rubber-asphalt coating and preparation method thereof - Google Patents
Rubber-asphalt coating and preparation method thereof Download PDFInfo
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- CN1050734A CN1050734A CN 90106305 CN90106305A CN1050734A CN 1050734 A CN1050734 A CN 1050734A CN 90106305 CN90106305 CN 90106305 CN 90106305 A CN90106305 A CN 90106305A CN 1050734 A CN1050734 A CN 1050734A
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Abstract
The invention discloses good rubber-asphalt coating of a kind of antiseptic property and preparation method thereof.This coating is to be bonding anticorrosion film-forming material with synthetic rubber such as neoprenes, is impregnating material with pitch, is ageing-resistant and damping material and other is filled, the reinforcement component mixes polycomponent superpolymer strong solution with rubber powder.It has the performance of good sea water resistance, diluted acid, alkene alkali, anti-high and low-temp performance and good elasticity, and binding property, waterproof and heat-insulating have solved the spraying wire drawing preferably and have been coated with the difficult problem that laminar flow weighs down.It is widely used in the anticorrosion and damping of steel construction such as various cars, ship, bridge, tube wall.
Description
A kind of spary coating type rubber-asphalt coating and preparation method thereof, this coating is mainly used in the protection against corrosion of steel construction.
Rubber-asphalt coating is the good high build paint of a kind of Corrosion Protection, because the viscosity flow feature of rubber strong solution is also not exclusively obeyed neutron dosimeter, its flow characteristics is very complicated, by disperse phase under the shear force effect, often there is structure to be formed into the structure deteriorate process, the former causes shear thickening, the latter causes shear force thinning, without the rubber asphalt slurry that changes thixotropic property, in the spraying process, under the shearing stress effect, produce flowing of shear thickening, disperse phase rubber macromolecule conformation changes under the shear force effect, long chain molecule departs from the balance conformation and the streamwise orientation, makes polymkeric substance be situated between to twine with molecular chain and is separated by this, ejection back wire drawing.Because the viscosity flow characteristic of rubber strong solution, one time coating thickness is big slightly, promptly produces run by gravity and weighs down.Therefore, the spary coating type rubber asphalt slurry at first will possess the pseudoplastic fluid dynamic characteristic, promptly under external force (as high pressure painting time) effect, when shearing stress increases to certain value, cut viscosity and reduce (shear force is thinning) with the increase of shear rate, possesses simultaneously the plastic flow characteristic again, when external force disappears (when being deposited on the attachment) as the ejection material, shearing stress just returns to the high viscosity stagnant condition immediately less than certain value (threshold value), if this threshold value is greater than the gravity shearing stress that produces because of certain thickness then possess not wire drawing, do not flow bob, the manufacturability that can spray.The at present domestic rubber-asphalt coating that is used on the steel construction such as passenger train is failed fine solution spraying wire drawing always, is coated with laminar flow and weighs down and an anticorrosion difficult problem that does not reach maintenance cycle.The record of the relevant rubber-asphalt coating of domestic and foreign literature also seldom finds no document related to the present invention openly so far.
The object of the present invention is to provide a kind of rubber-asphalt coating and prepare the method for this coating, this coating possesses: (1) can produce the thinning pseudo-plasticity of shear force and flow not wire drawing during spraying under external force; (2) can improve the shearing stress threshold value, make it, overcome run by gravity and weigh down greater than shearing stress because of the gravity generation; (3) excellent corrosion resisting performance, anti-high and low-temp performance and waterproof and heat-insulating performance.
The present invention takes following measure to achieve the above object:
Pitch 12～32% solvents 24.12～69.28%
Stockholm tar 0.8～3.2% chloroprene rubber 0.43～2.2%
Talcum powder 2～8% styrene-butadiene rubber(SBR) 0.5～5%
Rubber powder 2～8% promotor 0.02～0.24%
Fibrous magnesium silicate 2～8% anti-aging agent 0.005～0.096%
Perlite 2～6% stearic acid 0.2～2%
Thixotropic agent 4～10% resins 0.04～0.64%
In coating, pitch is as main anticorrosion, water-proof material, because of the bituminous binding property relatively poor, so add neoprene latex as bonding anticorrosion film-forming material.Also dosed mechanical property and spraying property that various subsidiary material improve coating in addition, added Stockholm tar and carry out tackify and improve snappiness, and anti-diluted acid, diluted alkaline, aging resistance; Add stearic acid as lubricant, improve the spraying property of coating; Add fibrous magnesium silicate, improve the mechanical property of coating, increase the intensity of coating, add talcum powder and perlite,, increase the intensity and the hardness of coating as filling, the supporting material of coating; Add rubber powder as material ageing-resistant, damping, this rubber powder can be natural gum, synthetical glue or reclaimed rubber.Promotor and anti-aging agent be the promoter material when mixing as neoprene latex, and promotor is metal oxide-type promotor, can be zinc oxide or magnesium oxide, and anti-aging agent can be antioxidant A or antioxidant d.Also added resin and butadiene-styrene rubber and come neoprene latex is carried out modification in coating, adjusted its solubility parameter, solved paint spay-coating stringy defective preferably, also can reduce the production cost of coating simultaneously, resin can be with resol or Synolac.
When selecting coating use solvent, should consider whether solvent conforms to the solubility parameter of solute (pitch, rubber, resin), also to consider the viscosity, time of drying of coating etc., generally employing to rubber, pitch, resin dissolves preferably solvent all can.Through a large amount of experiments, this coating selects toluene, dimethylbenzene, gasoline or their mixture as solvent, preferably selects the mixture of dimethylbenzene and gasoline for use, and wherein dimethylbenzene accounts for 50～70%, and gasoline accounts for 30～50%.
The selection particularly important of thixotropic agent in the coating, it is determining the spraying effect of coating, through a large amount of experiments, the selected at last stearates of this coating is as thixotropic agent, Zinic stearas preferably, use this thixotropic agent to solve and be coated with the difficult problem that laminar flow weighs down, this thixotropic agent also can doublely be done stablizer, lubricant and dispersion agent in coating simultaneously.
The preparation method of coating is divided into three big steps: prepare raw material first, raw material second respectively earlier, then two kinds of stock liquids are mixed into finished product coating.
1, the preparation of raw material first
Pitch is broken into fritter earlier, the foreign material that inspection is sneaked into, the proportioning by pitch 60～80%, solvent 15～30%, Stockholm tar 4～8%, stearic acid 1～5% joins in the reactor successively then, starts agitator, more than the heat temperature raising to 60 ℃, it is molten entirely to be continuously stirring to pitch.
2, the preparation of raw material second
Prepare rubber unvulcanizate and resin liquid earlier, then with both mixed dissolutions.
2.1 the preparation of rubber unvulcanizate
Press neoprene latex 86～92%, anti-aging agent 1～4%, the proportioning of promotor 4～10% is carried out mixing in mill, and mixing condition is not done particular requirement, adopts the general technology condition to get final product, and mixing back is the sheet cooling down.
2.2 the preparation of resin liquid
Proportioning by resin 20～40%, solvent 60～80% joins in the reactor successively, under 80～85 ℃, is continuously stirring to molten entirely.
2.3 the preparation of raw material second
Press rubber unvulcanizate 5～12%, solvent 60～80%, butadiene-styrene rubber 5～25%, the proportioning of resin liquid 2～8% is put into rubber unvulcanizate, solvent and butadiene-styrene rubber in the reactor successively, stirs, and then resin liquid is joined again that continuing in the still stirs gets final product.
3, the preparation of coating finished product
Press proportioning:
Raw material first 20～40% raw material second 10～20%
Fibrous magnesium silicate 2～8% rubber powders 3～10%
Perlite 2～6% talcum powder 2～8%
Thixotropic agent 3～10% solvents 15～40%
Raw material first, perlite, fibrous magnesium silicate, rubber powder, talcum powder, thixotropic agent, solvent are put in the reactor, stirred, then raw material second is dropped in the still, be product after continuing to stir.
The result of each component comprehensive action in the coating of the present invention makes it have good Corrosion Protection, high and low temperature resistance, and good elasticity, tackiness, waterproof and heat-insulating, the diluted alkaline of anti-diluted acid performance.Its resistance to impact shock reaches 50kg cm, at 100 ℃ of following non-foaming, saggings not of baking 4 hours, does not break in freezing 2 hours down at-40 ℃.In bigger denseness and temperature change scope, it have good face upward, side, prosposition sprayability, solved rubber asphalt slurry strong solution-filler systems spraying wire drawing, be coated with the difficult problem that laminar flow weighs down.It is specially adapted to the anticorrosion and damping of railway bus body steel structure, and it is inhomogeneous to have solved on steel structure of car body blade coating, and beam column, corner blade coating are not tight, problems such as the coating density is bad, improve preservative effect greatly, can prolong the repair in shop phase more than 1.5 years, improved value more than 20%.Because its good thixotropy, when adopting the dense fluid spraying machine spraying application, the steel structure of car body that can overturn carries out the spraying application of any angle, and one time the above coating of coating thickness 2mm does not flow bob.Thereby solved the production key that when passenger vehicle is gone into operation still can not come into operation in the roll-over table position.
Below by several embodiment the present invention is further described:
Following proportioning all is weight percentage, and wherein solvent is dimethylbenzene and 200
#Gasoline was with 1: 1 mixing mixture.
1, the preparation of raw material first
Embodiment 1: pitch 65%, Stockholm tar 6%, solvent 28%, stearic acid 1%.
Embodiment 2: pitch 70%, Stockholm tar 5%, solvent 21%, stearic acid 4%.
Embodiment 3: pitch 75%, Stockholm tar 7%, solvent 15%, stearic acid 3%.
By above-mentioned prescription, earlier pitch is broken into fritter, check the foreign material of sneaking into, join successively in the reactor then, start agitator, heat temperature raising is controlled between 70～80 ℃, and continuously stirring 40～50min is to molten entirely.
2, the preparation of raw material second
2.1 the preparation of rubber unvulcanizate
Embodiment 1: neoprene latex 88%, antioxidant d 3%, zinc oxide 9%.
Embodiment 2: neoprene latex 90%, antioxidant d 4%, zinc oxide 6%.
Embodiment 3: neoprene latex 92%, antioxidant d 4%, zinc oxide 4%.
By above-mentioned prescription, under 50～60 ℃, thin-pass 10 times in the mill of 1～2mm with neoprene latex in roll spacing, following sheet cools off thin-pass 10 times again, descend the sheet cooling again, adds antioxidant d and zinc oxide then, thin-pass 4～5 times, following sheet cools off standby.
2.2 the preparation of resin liquid
Embodiment 1: resol 24%, solvent 76%.
Embodiment 2: resol 30%, solvent 70%.
Embodiment 3: resol 38%, solvent 62%.
By above-mentioned prescription resol and solvent are joined in the reactor successively, under 80～85 ℃, the about 30～40min of continuously stirring is to molten entirely.
2.3 the preparation of raw material second
Embodiment 1: rubber unvulcanizate 6%, solvent 65%, butadiene-styrene rubber 24%, resin liquid 5%.
Embodiment 2: rubber unvulcanizate 8%, solvent 80%, butadiene-styrene rubber 10%, resin liquid 2%.
Embodiment 3: rubber unvulcanizate 11%, solvent 70%, butadiene-styrene rubber 15%, resin liquid 4%.
Rubber unvulcanizate is cut into the fritter of 50～80mm, by above-mentioned prescription rubber unvulcanizate, solvent, butadiene-styrene rubber is put in the reactor successively, stir 4～5h, shut down resin liquid is added in the still restir 4～5h till evenly, twice churning time must not be less than 8h.
3, the preparation of finished product
Embodiment 1: raw material first 25%, raw material second 11%, fibrous magnesium silicate 7%, perlite 3%, ground rubber 6%, talcum powder 3%, Zinic stearas 6%, solvent 39%.
Embodiment 2: raw material first 30%, raw material second 15%, fibrous magnesium silicate 4%, perlite 5%, rubber powder 3%, talcum powder 7%, Zinic stearas 8%, solvent 28%.
Embodiment 3: raw material first 36%, raw material second 18%, fibrous magnesium silicate 2%, perlite 6%, rubber powder 8%, talcum powder 3%, Zinic stearas 10%, solvent 17%.
Is to put in the reactor after 50～60 ℃ raw material first is filtered by prescription with temperature; after under constantly stirring, dropping into the about 10～20min of perlite, fibrous magnesium silicate, rubber powder, talcum powder, Zinic stearas and stirring solvent successively with raw material second input, continue again stir about 20～30min to liquid can shut down discharging after evenly, the packing of weighing.
The product that makes by the prescription of the foregoing description 1, embodiment 2, embodiment 3 has following composition:
Claims (6)
1, a kind of rubber-asphalt coating is characterized in that: contained each component has following weight percent and forms:
Pitch 12～32% solvents 24.12～69.28%
Stockholm tar 0.8～3.2% chloroprene rubber 0.43～2.2%
Talcum powder 2～8% styrene-butadiene rubber(SBR) 0.5～5%
Rubber powder 2～8% promotor 0.02～0.24%
Fibrous magnesium silicate 2～8% anti-aging agent 0.005～0.096%
Perlite 2～6% stearic acid 0.2～2%
Thixotropic agent 4～10% resins 0.04～0.64%
Wherein solvent is to rubber, pitch, resin dissolves solvent preferably, thixotropic agent is a stearates, and promotor is metal oxide-type promotor, and resin is resol or Synolac, rubber powder is natural gum, synthetical glue or reclaimed rubber, and anti-aging agent is antioxidant A or antioxidant d.
2, rubber-asphalt coating according to claim 1 is characterized in that: the solvent in the coating can be toluene, dimethylbenzene, gasoline or their mixture.
3, rubber-asphalt coating according to claim 2 is characterized in that: the solvent in the coating is the mixture of dimethylbenzene and gasoline, and wherein dimethylbenzene accounts for 50～70%, and gasoline accounts for 30～50%.
4, rubber-asphalt coating according to claim 1 is characterized in that: the thixotropic agent in the coating is a Zinic stearas.
5, rubber-asphalt coating according to claim 1 is characterized in that: the promotor in the coating can be zinc oxide or magnesium oxide.
6, according to the preparation method of the described coating of claim 1, it is characterized in that: this method is divided into following three big steps:
(1) preparation of raw material first
Proportioning by pitch 60～80%, Stockholm tar 4～8%, solvent 15～30%, stearic acid 1～5% joins in the reactor successively, in temperature more than 60 ℃, be continuously stirring to complete molten the getting final product of pitch.
(2) preparation of raw material second
(2.1) preparation of rubber unvulcanizate
Undertaken mixingly by the proportioning of neoprene latex 86～92%, anti-aging agent 1～4%, promotor 4～10%, the cooling of following sheet is standby.
(2.2) preparation of resin liquid
By resin 20～40%, solvent 60～80%, proportioning join in the reactor, under 80～85 ℃ of temperature, be continuously stirring to complete molten standby.
(2.3) preparation of raw material second
Press rubber unvulcanizate 5～12%, the proportioning of solvent 60～80%, butadiene-styrene rubber 5～25% adds in the reactor successively, after stirring, resin liquid 2～8% is added in the still again, is stirred to complete molten getting final product.
(3) preparation of coating finished product
Press proportioning: raw material first 20～40% rubber powders 2～8%
Raw material second 10～20% solvents 15～40%
Perlite 2～6% thixotropic agent 4～10%
Talcum powder 2～8% fibrous magnesium silicates 2～8%
With temperature is to put in the reactor after 50～60 ℃ raw material first is filtered, under constantly stirring, drop into perlite, fibrous magnesium silicate, rubber powder, talcum powder, thixotropic agent and solvent successively, after stirring, again raw material second is added, be finished product after continuing to stir.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90106305 CN1025209C (en) | 1990-11-07 | 1990-11-07 | Rubber asphalt paint and preparing process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90106305 CN1025209C (en) | 1990-11-07 | 1990-11-07 | Rubber asphalt paint and preparing process thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1050734A true CN1050734A (en) | 1991-04-17 |
| CN1025209C CN1025209C (en) | 1994-06-29 |
Family
ID=4879948
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90106305 Expired - Fee Related CN1025209C (en) | 1990-11-07 | 1990-11-07 | Rubber asphalt paint and preparing process thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1025209C (en) |
Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1041428C (en) * | 1994-06-21 | 1998-12-30 | 中国石油化工总公司石油化工科学研究院 | Sound-insulation vibration-proof paint |
| CN1045455C (en) * | 1992-11-19 | 1999-10-06 | 江西省万载橡胶厂 | Production method for rubber water-proof paint using water substituted for solvent |
| CN1073609C (en) * | 1998-06-06 | 2001-10-24 | 李乃榜 | Mastic paint |
| CN1325596C (en) * | 2003-04-23 | 2007-07-11 | 闵早兵 | Sealant in use for boatyard and fabricating method |
| CN100371392C (en) * | 2006-01-10 | 2008-02-27 | 沈阳市城建路桥材料有限公司 | Waste fiber doped asphalt mixing material and its production method |
| CN1847335B (en) * | 2006-05-09 | 2010-04-07 | 邹文和 | Prepn process of anticorrosive metal paint |
| CN103102808A (en) * | 2012-11-13 | 2013-05-15 | 益阳祥瑞科技有限公司 | Asphalt chloroprene rubber coating |
| CN103214205A (en) * | 2013-04-07 | 2013-07-24 | 浙江大学宁波理工学院 | Chemical erosion-resistant additive of bituminous mixture |
| CN103265848A (en) * | 2013-05-24 | 2013-08-28 | 苏州市德莱尔建材科技有限公司 | Styrene butadiene rubber waterproof paint for wood material |
| CN103396593A (en) * | 2013-07-30 | 2013-11-20 | 青岛科技大学 | Anti-corrosion layer rubber for normal-temperature vulcanized buried metallic pipeline and preparation method thereof |
| CN103602217A (en) * | 2013-10-10 | 2014-02-26 | 安徽真信涂料有限公司 | Asphalt rust-resisting paint for ship bottom and preparation method thereof |
| CN103773013A (en) * | 2014-01-20 | 2014-05-07 | 南通东南公路工程有限公司 | Rubber asphalt water-proof material |
| CN103773031A (en) * | 2014-01-20 | 2014-05-07 | 南通东南公路工程有限公司 | Rubber modified asphalt waterproof material |
| CN103788670A (en) * | 2014-01-20 | 2014-05-14 | 南通东南公路工程有限公司 | Asphalt phenolic waterproof material |
| CN103951988A (en) * | 2014-04-23 | 2014-07-30 | 苏州羽帆新材料科技有限公司 | Break-resistant and corrosion-resistant asphalt material and preparation method thereof |
| CN105330925A (en) * | 2015-12-09 | 2016-02-17 | 广西远景资源再生股份有限公司 | Special rubber powder for non-cured rubber asphalt waterproof coating and preparation method thereof |
| CN106009721A (en) * | 2016-05-27 | 2016-10-12 | 安庆越球建筑防水材料有限公司 | Building waterproofing material |
| CN106189860A (en) * | 2016-07-28 | 2016-12-07 | 江苏昌悦重工科技有限公司 | Waterproof salt spray resistance photovoltaic plant case |
| CN107779098A (en) * | 2017-11-08 | 2018-03-09 | 吉林省豫王建能实业股份有限公司 | A kind of uncured Rubber Modified Asphalt Waterproof Coating of normal temperature and preparation method thereof |
| CN107815225A (en) * | 2017-11-14 | 2018-03-20 | 安徽省神洲建材科技有限公司 | A kind of building water-proof paint |
| CN109280490A (en) * | 2018-08-31 | 2019-01-29 | 湖北华宇防水材料科技股份有限公司 | A kind of water-repellent paint and the preparation method and application thereof |
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| US6569351B1 (en) * | 2000-03-14 | 2003-05-27 | Ergon, Inc. | Accelerator-gel additive for use in the production of polymer-modified asphalt |
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- 1990-11-07 CN CN 90106305 patent/CN1025209C/en not_active Expired - Fee Related
Cited By (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1045455C (en) * | 1992-11-19 | 1999-10-06 | 江西省万载橡胶厂 | Production method for rubber water-proof paint using water substituted for solvent |
| CN1041428C (en) * | 1994-06-21 | 1998-12-30 | 中国石油化工总公司石油化工科学研究院 | Sound-insulation vibration-proof paint |
| CN1073609C (en) * | 1998-06-06 | 2001-10-24 | 李乃榜 | Mastic paint |
| CN1325596C (en) * | 2003-04-23 | 2007-07-11 | 闵早兵 | Sealant in use for boatyard and fabricating method |
| CN100371392C (en) * | 2006-01-10 | 2008-02-27 | 沈阳市城建路桥材料有限公司 | Waste fiber doped asphalt mixing material and its production method |
| CN1847335B (en) * | 2006-05-09 | 2010-04-07 | 邹文和 | Prepn process of anticorrosive metal paint |
| CN103102808A (en) * | 2012-11-13 | 2013-05-15 | 益阳祥瑞科技有限公司 | Asphalt chloroprene rubber coating |
| CN103214205A (en) * | 2013-04-07 | 2013-07-24 | 浙江大学宁波理工学院 | Chemical erosion-resistant additive of bituminous mixture |
| CN103214205B (en) * | 2013-04-07 | 2014-09-17 | 浙江大学宁波理工学院 | Chemical erosion-resistant additive of bituminous mixture |
| CN103265848A (en) * | 2013-05-24 | 2013-08-28 | 苏州市德莱尔建材科技有限公司 | Styrene butadiene rubber waterproof paint for wood material |
| CN103396593A (en) * | 2013-07-30 | 2013-11-20 | 青岛科技大学 | Anti-corrosion layer rubber for normal-temperature vulcanized buried metallic pipeline and preparation method thereof |
| CN103396593B (en) * | 2013-07-30 | 2015-07-22 | 青岛科技大学 | Anti-corrosion layer rubber for normal-temperature vulcanized buried metallic pipeline and preparation method thereof |
| CN103602217A (en) * | 2013-10-10 | 2014-02-26 | 安徽真信涂料有限公司 | Asphalt rust-resisting paint for ship bottom and preparation method thereof |
| CN103602217B (en) * | 2013-10-10 | 2016-04-27 | 安徽真信涂料有限公司 | A kind of Asphalt ship-bottom anti-rust paint and preparation method thereof |
| CN103773031A (en) * | 2014-01-20 | 2014-05-07 | 南通东南公路工程有限公司 | Rubber modified asphalt waterproof material |
| CN103788670A (en) * | 2014-01-20 | 2014-05-14 | 南通东南公路工程有限公司 | Asphalt phenolic waterproof material |
| CN103788670B (en) * | 2014-01-20 | 2016-04-13 | 南通东南公路工程有限公司 | A kind of pitch phenolic aldehyde water-proof material |
| CN103773013A (en) * | 2014-01-20 | 2014-05-07 | 南通东南公路工程有限公司 | Rubber asphalt water-proof material |
| CN103951988A (en) * | 2014-04-23 | 2014-07-30 | 苏州羽帆新材料科技有限公司 | Break-resistant and corrosion-resistant asphalt material and preparation method thereof |
| CN105330925A (en) * | 2015-12-09 | 2016-02-17 | 广西远景资源再生股份有限公司 | Special rubber powder for non-cured rubber asphalt waterproof coating and preparation method thereof |
| CN106009721A (en) * | 2016-05-27 | 2016-10-12 | 安庆越球建筑防水材料有限公司 | Building waterproofing material |
| CN106189860A (en) * | 2016-07-28 | 2016-12-07 | 江苏昌悦重工科技有限公司 | Waterproof salt spray resistance photovoltaic plant case |
| CN107779098A (en) * | 2017-11-08 | 2018-03-09 | 吉林省豫王建能实业股份有限公司 | A kind of uncured Rubber Modified Asphalt Waterproof Coating of normal temperature and preparation method thereof |
| CN107815225A (en) * | 2017-11-14 | 2018-03-20 | 安徽省神洲建材科技有限公司 | A kind of building water-proof paint |
| CN109280490A (en) * | 2018-08-31 | 2019-01-29 | 湖北华宇防水材料科技股份有限公司 | A kind of water-repellent paint and the preparation method and application thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1025209C (en) | 1994-06-29 |
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