CN109825137A - A kind of cold resistance polymer cement waterproof paint and preparation method thereof - Google Patents
A kind of cold resistance polymer cement waterproof paint and preparation method thereof Download PDFInfo
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- CN109825137A CN109825137A CN201910061811.5A CN201910061811A CN109825137A CN 109825137 A CN109825137 A CN 109825137A CN 201910061811 A CN201910061811 A CN 201910061811A CN 109825137 A CN109825137 A CN 109825137A
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Abstract
The invention discloses a kind of cold resistance polymer cement waterproof paints and preparation method thereof, including component A and B component, wherein, component A includes 75~90 parts of cold resistance acrylic acid ester emulsion, 0.4~0.8 part of defoaming agent, 0.1~0.4 part of dispersing agent, 0.2~0.4 part of preservative, 0.2~0.6 part of thickener, 1~2 part of glycerine, 1~4 part of ethyl alcohol, 1~2 part of TEXANOL and 10~25 parts of water；B component includes 30~40 parts of cement, 20~50 parts of coarse whiting and 20~40 parts of talcum powder.The present invention passes through specific cold resistance acrylic acid ester emulsion, realize the cold resistance of polymer cement waterproof paint, can prolonged cold storage, it is still good through repeated freeze-thaw cycle effect, it is not stratified, at -10 DEG C still good construction effect is remain, the problems such as the effective solution low-temperature storage of polymer cement waterproof paint, transport and constructional difficulties, and preparation process is simple, is made and promotes.
Description
Technical field
The present invention relates to polymer cement waterproof paint fields, more particularly to cold resistance polymer cement waterproof paint.
Background technique
Polymer cement waterproof paint be by synthesising macromolecule copolymer lotion (such as polyacrylate, polyvinyl acetate,
SBR emulsion etc.) and various additives optimum organization made of liquid material and matched powder (by special cement, silica flour and
Various additives composition) the bi-component water-repellent paint that is combined is that a kind of both have synthesising macromolecule copolymer elastic properties of materials
The high and good waterproof material of organic and/or inorganic materials durability.
Polymer cement waterproof applies
The inorganic powder of composition passes through rational proportion, a kind of compounded two-component, aqueous architectural water-repellent paint.
In northern area, day and night temperature is big, winter low temperature come morning, October Low Night Temperature can reach 0 DEG C hereinafter, to
Storage, transport and the construction of polymer cement waterproof paint bring difficulty, will appear layering demulsifying phenomenon when serious, not only
Biggish economic loss is caused, also causes very big influence to market management.
Summary of the invention
The invention mainly solves the technical problem of providing a kind of cold resistance polymer cement waterproof paints, being capable of low temperature storage
It deposits, and low-temperature construction works well.
In order to solve the above technical problems, one technical scheme adopted by the invention is that:
A kind of cold resistance polymer cement waterproof paint, including component A and B component are provided；Wherein, comprising resistance in component A
The raw material of cold acrylic acid ester emulsion, the cold resistance acrylic acid ester emulsion includes the substance of following parts by weight: Ks-108 2~4
Part, 0.1~0.4 part of K12,20~35 parts of butyl acrylate, 2~6 parts of ethyl acrylate, 10~25 parts of styrene, metering system
1~3 part of sour methyl esters, 10~20 parts of organic silicon monomer, 2~10 parts of KH570,2~4 parts of ammonium persulfate, pH adjusting agent and deionization
50~80 parts of water.
The Ks-108 is a kind of complexed surfactant of corresponding model.
The K12 is lauryl sodium sulfate.
The KH570 is silane coupling agent: γ-methacryloxypropyl trimethoxy silane.
Further, the organic silicon monomer is selected from methylchlorosilane, phenyl chlorosilane, methylvinyl-chlorosilanes, second
One of base trichlorosilane, propyltrichlorosilan, vinyl trichlorosilane, γ-chloropropyl trichloro-silane, fluoropolymer emulsion are several
Kind；The pH adjusting agent is the ammonium hydroxide that mass concentration is 1%.
Further, the component A includes the raw material of following parts by weight: 75~90 parts of cold resistance acrylic acid ester emulsion disappears
0.4~0.8 part of infusion, 0.1~0.4 part of dispersing agent, 0.2~0.4 part of preservative, 0.2~0.6 part of thickener, glycerine 1~2
Part, 1~4 part of ethyl alcohol, 1~2 part of TEXANOL and 10~25 parts of water.
The TEXANOL refers to a kind of coalescing agent of Eastman Chemical's exploitationEster alcohol.
Ester alcohol (2,2,4- trimethyl -1,3 pentanediol mono isobutyrate), is the excellent of polymer latex
Good coalescing agent, hydrolytic stability is high, can be used in many different types of lotions, the acrylate cream including high ph-values
Liquid.
Further, the defoaming agent is selected from one or more of BYK016, BYC-5133, BYC-5034；Described point
Powder is selected from one or more of XS-6100, dispersing agent 5040；The preservative is selected from MFF-08；The thickener is selected from
One or more of 638 thickeners, thickener P-6366.
The BYK016 is the auxiliary agent of the correspondence model of Germany's Bi Ke chemistry.
Described BYC-5133, BYC-5034 are the auxiliary agent of the correspondence model of the new ten thousand one-tenth Environmental Protection Technology Co., Ltd in Hefei.
The MFF-08 is the auxiliary agent for the correspondence model that marine foundation border waterproof material Co., Ltd is built in Beijing.
The thickener P-6366 is the auxiliary agent of the correspondence model of Guangzhou Pei Shang Environmental Protection Technology Co., Ltd.
Above-mentioned Ks-108, XS-6100, dispersing agent 5040,638 thickeners are the model of commercially available corresponding auxiliary agent, not
It is limited to certain commodity, the product of the same model of different manufacturers production is applicable in.
Further, the B component includes the raw material of following parts by weight: 30~40 parts of cement, 20~50 parts of coarse whiting and cunning
20~40 parts of mountain flour.
Further, the mass ratio of the component A and B component of the cold resistance polymer cement waterproof paint is 1~2:
1。
Further, the emulsion particle diameter of the cold resistance acrylic acid ester emulsion is 100~130nm.
The present invention also provides the preparation methods of above-mentioned cold resistance polymer cement waterproof paint, including the following steps:
(1) cold resistance acrylic acid ester emulsion is prepared；
(2) it prepares component A: weighing each raw material according to composition of raw materials and be uniformly mixed；
(3) it prepares B component: weighing each raw material according to composition of raw materials and be uniformly mixed, and be ground to particle diameter and be not more than
30um.
The present invention also provides a kind of cold resistance acrylic acid ester emulsion, the raw material including following parts by weight: Ks-108 2~4
Part, 0.1~0.4 part of K12,20~35 parts of butyl acrylate, 2~6 parts of ethyl acrylate, 10~25 parts of styrene, metering system
1~3 part of sour methyl esters, 10~20 parts of organic silicon monomer, 2~10 parts of KH570,2~4 parts of ammonium persulfate, pH adjusting agent and deionization
50~80 parts of water.
The present invention also provides the methods of above-mentioned cold resistance acrylic acid ester emulsion, characterized in that it comprises the following steps:
(1) Ks-108, K12, butyl acrylate, ethyl acrylate, styrene, methacrylic acid are added into reaction vessels
Methyl esters, organic silicon monomer, KH570 and water stir evenly to obtain pre-emulsion.
(2) pre-emulsion for taking pre-emulsion gross mass 30~50% obtained by step (1) is warming up to 65 DEG C, and formula is added
The ammonium persulfate of middle ammonium persulfate total amount 1/3, in 80~85 DEG C of 5~15min of reaction；Wherein, pre-emulsion and ammonium persulfate is added dropwise
It is 1.5~2.5h, soaking time 1h that the time of aqueous solution, which has altogether,.
Remaining pre-emulsion is successively added dropwise in (3) 80~90 DEG C of pre-emulsions in step (2) and according to formula ratio residue
Ammonium persulfate aqueous solution, after dripping at 85~90 DEG C keep the temperature 0.7~1.3h.
(4) be cooled to 40~50 DEG C, be added pH adjusting agent to system pH be 6.5~8 to get.
Further, in the step (1), reaction time 10min.
The beneficial effects of the present invention are:
(1) cold resistance polymer cement waterproof paint of the present invention uses the specific cold resistance acrylate cream of the present invention
Liquid, cold tolerance is good, can prolonged cold storage, it is still good through repeated freeze-thaw cycle effect, it is not stratified, -10 DEG C still protect
Hold good construction effect, the effective solution low-temperature storage of polymer cement waterproof paint, transport and constructional difficulties etc.
Problem.
(2) present invention component proportion specific through the invention and preparation process, cold resistance acrylic acid ester emulsion obtained
Film-forming temperature is low, and emulsion particle diameter is small, and lotion freezing point is low, and raw material sources are extensive, and preparation process is simple.
(3) preparation process of cold resistance polymer cement waterproof paint of the present invention is simple, low in cost, it can be achieved that extensive
Production, has a vast market application prospect.
Specific embodiment
Technical solution of the present invention is clearly and completely described below, it is clear that described embodiment is the present invention
A part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not having
Every other embodiment obtained under the premise of creative work is made, shall fall within the protection scope of the present invention.
In embodiment:
Ks-108 is a kind of commercially available complexed surfactant of corresponding model；
K12 is lauryl sodium sulfate；
KH570 is silane coupling agent: γ-methacryloxypropyl trimethoxy silane；
TEXANOL refers to a kind of coalescing agent of Eastman Chemical's exploitationEster alcohol；
BYK016 is the auxiliary agent of the correspondence model of Germany's Bi Ke chemistry；
BYC-5133, BYC-5034 are the auxiliary agent of the correspondence model of the new ten thousand one-tenth Environmental Protection Technology Co., Ltd in Hefei；
MFF-08 is the auxiliary agent for the correspondence model that marine foundation border waterproof material Co., Ltd is built in Beijing；
Thickener P-6366 is the auxiliary agent of the correspondence model of Guangzhou Pei Shang Environmental Protection Technology Co., Ltd；
XS-6100, dispersing agent 5040,638 thickeners are the model of commercially available corresponding auxiliary agent；
XS-6100 and dispersing agent 5040 are dispersing agent model.
Embodiment 1
(1) Ks-108 2kg, K12 0.1kg, 0.1~0.4kg of butyl acrylate, acrylic acid second are added into reaction vessels
Ester 2kg, styrene 10kg, methyl methacrylate 1kg, methylchlorosilane 1kg, KH570 2kg and water 40kg, stir evenly
Pre-emulsion.
(2) pre-emulsion for taking pre-emulsion gross mass 30% obtained by step (1), is heated and is warming up to 65 DEG C, disposable fast
0.7kg ammonium persulfate, stirring, in 80 DEG C of reaction 5min is added in speed.
(3) mixed system of step (2) is heated to 85 DEG C, remaining pre-emulsion is successively added dropwise thereto, then drips again
Adding the aqueous solution (mixing 1.4kg ammonium persulfate and 10kg deionized water) of ammonium persulfate, two steps, which are added dropwise, needs 1.5h altogether,
0.7h is kept the temperature at 85 DEG C after dripping.
(4) mixed system of step (3) is cooled to 40 DEG C, the pH for the ammonia water conditioning system that mass concentration is 1% is added
Value is 6.5~8, and cold resistance acrylic acid ester emulsion is made, and emulsion particle diameter is 100~130nm.
(5) component A is prepared: by cold resistance acrylic acid ester emulsion 75kg, BYC-5133 0.4kg, dispersing agent 5040
0.1kg, MFF-08 0.2kg, 638 thickener 0.2kg, glycerine 1kg, ethyl alcohol 1kg, TEXANOL 1kg and water 10kg mixing are equal
The even component A to get cold resistance polymer cement waterproof paint of the present invention.
(6) it prepares B component: after cement 30kg, coarse whiting 20kg and talcum powder 20kg are mixed, being put into pulverizer and ground
Mill is ground to particle diameter and discharges no more than 30um to get the B component of cold resistance polymer cement waterproof paint of the present invention.
In actual use, component A and B component need to be only uniformly mixed according to mass ratio 1: 1.
Embodiment 2
(1) Ks-108 4kg, K12 0.4kg, butyl acrylate 0.4kg, ethyl acrylate are added into reaction vessels
6kg, styrene 25kg, methyl methacrylate 3kg, methylvinyl-chlorosilanes 3kg, KH570 10kg and water 60kg, stirring
It is uniform to obtain pre-emulsion.
(2) pre-emulsion for taking pre-emulsion gross mass 50% obtained by step (1), is heated and is warming up to 65 DEG C, disposable fast
1.3kg ammonium persulfate, stirring, in 85 DEG C of reaction 15min is added in speed.
(3) mixed system of step (2) is heated to 90 DEG C, remaining pre-emulsion is successively added dropwise thereto, then drips again
Adding the aqueous solution (mixing 2.6kg ammonium persulfate and 20kg deionized water) of ammonium persulfate, two steps, which are added dropwise, needs 2.5h altogether,
1.3h is kept the temperature at 90 DEG C after dripping.
(4) mixed system of step (3) is cooled to 50 DEG C, the pH for the ammonia water conditioning system that mass concentration is 1% is added
Value is 6.5~8, and cold resistance acrylic acid ester emulsion is made, and emulsion particle diameter is 100~130nm.
(5) component A is prepared: by cold resistance acrylic acid ester emulsion 90kg, BYC-5133 0.8kg, dispersing agent 5040
0.4kg, MFF-08 0.4kg, thickener P-6366 0.6kg, glycerine 2kg, ethyl alcohol 4kg, TEXANOL 2kg and water 25kg are mixed
It closes uniformly to get the component A of cold resistance polymer cement waterproof paint of the present invention.
(6) it prepares B component: after cement 40kg, coarse whiting 50kg and talcum powder 40kg are mixed, being put into pulverizer and ground
Mill is ground to particle diameter and discharges no more than 30um to get the B component of cold resistance polymer cement waterproof paint of the present invention.
In actual use, component A and B component need to be only uniformly mixed according to mass ratio 2: 1.
Embodiment 3
(1) Ks-108 3kg, K12 0.25kg, butyl acrylate 0.25kg, ethyl acrylate are added into reaction vessels
4kg, styrene 17kg, methyl methacrylate 2kg, γ-chloropropyl trichloro-silane 2kg, KH570 6kg and water 50kg, stirring
It is uniform to obtain pre-emulsion.
(2) pre-emulsion for taking pre-emulsion gross mass 40% obtained by step (1), is heated and is warming up to 65 DEG C, disposable fast
1kg ammonium persulfate, stirring, in 82 DEG C of reaction 10min is added in speed.
(3) mixed system of step (2) is heated to 86 DEG C, remaining pre-emulsion is successively added dropwise thereto, then drips again
Add the aqueous solution (mixing 2kg ammonium persulfate and 15kg deionized water) of ammonium persulfate, two steps, which are added dropwise, needs 2h altogether, is added dropwise
1h is kept the temperature at 86 DEG C after complete.
(4) mixed system of step (3) is cooled to 45 DEG C, the pH for the ammonia water conditioning system that mass concentration is 1% is added
Value is 6.5~8, and cold resistance acrylic acid ester emulsion is made, and emulsion particle diameter is 100~130nm.
(5) prepare component A: by cold resistance acrylic acid ester emulsion 85kg, BYK016 0.6kg, XS-6100 0.25kg,
MFF-08 0.3kg, 638 thickener 0.4kg, glycerine 1.5kg, ethyl alcohol 2.5kg, TEXANOL 1.5kg and water 18kg mixing are equal
The even component A to get cold resistance polymer cement waterproof paint of the present invention.
(6) it prepares B component: after cement 35kg, coarse whiting 35kg and talcum powder 30kg are mixed, being put into pulverizer and ground
Mill is ground to particle diameter and discharges no more than 30um to get the B component of cold resistance polymer cement waterproof paint of the present invention.
In actual use, component A and B component need to be only uniformly mixed according to mass ratio 1.5: 1.
Embodiment 4
(1) Ks-108 2kg, K12 0.4kg, butyl acrylate 0.4kg, ethyl acrylate are added into reaction vessels
2kg, styrene 15kg, methyl methacrylate 2.5kg, propyltrichlorosilan 2.5kg, KH570 8kg and water 55kg, stirring are equal
It is even to obtain pre-emulsion.
(2) pre-emulsion for taking pre-emulsion gross mass 40% obtained by step (1), is heated and is warming up to 65 DEG C, disposable fast
1kg ammonium persulfate, stirring, in 82 DEG C of 5~15min of reaction is added in speed.
(3) mixed system of step (2) is heated to 85 DEG C, remaining pre-emulsion is successively added dropwise thereto, then drips again
Add the aqueous solution (mixing 2kg ammonium persulfate and 15 deionized waters) of ammonium persulfate, two steps, which are added dropwise, needs 2h altogether, drips
1h is kept the temperature at 87 DEG C afterwards.
(4) mixed system of step (3) is cooled to 45 DEG C, the pH for the ammonia water conditioning system that mass concentration is 1% is added
Value is 6.5~8, and cold resistance acrylic acid ester emulsion is made, and emulsion particle diameter is 100~130nm.
(5) prepare component A: by cold resistance acrylic acid ester emulsion 82kg, BYK016 0.5kg, 5040 0.2kg of dispersing agent,
MFF-08 0.2kg, thickener P-6366 0.2kg, glycerine 2kg, ethyl alcohol 3kg, TEXANOL 1kg and water 20kg mixing are equal
The even component A to get cold resistance polymer cement waterproof paint of the present invention.
(6) it prepares B component: after cement 35kg, coarse whiting 40kg and talcum powder 25kg are mixed, being put into pulverizer and ground
Mill is ground to particle diameter and discharges no more than 30um to get the B component of cold resistance polymer cement waterproof paint of the present invention.
In actual use, component A and B component need to be only uniformly mixed according to mass ratio 1.5: 1.
Embodiment 5
The resulting cold resistance polymer cement waterproof paint of each embodiment is subjected to performance survey according to GB/T 23445-2009
Examination, data are shown in Table 1:
Table 1
The resulting cold resistance polymer cement waterproof paint of each embodiment is carried out Frozen-thawed cycled: -20 DEG C freeze, and+20 DEG C
Immersion is melted, and using effect is still good after 10 Frozen-thawed cycleds, and does not occur lamination.
The minimum film formation temperature of embodiment 1,2,3,4 is -10 DEG C, -10 DEG C, -12 DEG C, -15 DEG C respectively, in -10 DEG C of conditions
- 10 DEG C or more construction effects will be good without lamination in lower storage March.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (10)
1. a kind of cold resistance polymer cement waterproof paint, which is characterized in that including component A and B component；Wherein, it is wrapped in component A
The raw material of acrylic acid ester emulsion containing cold resistance, the cold resistance acrylic acid ester emulsion includes the substance of following parts by weight: Ks-1082
~4 parts, 0.1~0.4 part of K12,20~35 parts of butyl acrylate, 2~6 parts of ethyl acrylate, 10~25 parts of styrene, methyl
It 1~3 part of methyl acrylate, 10~20 parts of organic silicon monomer, KH5702~10 part, 2~4 parts of ammonium persulfate, pH adjusting agent and goes
50~80 parts of ionized water.
2. coating according to claim 1, which is characterized in that the organic silicon monomer is selected from methylchlorosilane, phenylchloride
Silane, methylvinyl-chlorosilanes, ethyl trichlorosilane, propyltrichlorosilan, vinyl trichlorosilane, γ-chloropropyl trichlorine
One or more of silane, fluoropolymer emulsion；The pH adjusting agent is the ammonium hydroxide that mass concentration is 1%.
3. coating according to claim 1, which is characterized in that the component A includes the raw material of following parts by weight: cold resistance
75~90 parts of acrylic acid ester emulsion, 0.4~0.8 part of defoaming agent, 0.1~0.4 part of dispersing agent, 0.2~0.4 part of preservative, thickening
0.2~0.6 part of agent, 1~2 part of glycerine, 1~4 part of ethyl alcohol, 1~2 part of TEXANOL and 10~25 parts of water.
4. coating according to claim 3, which is characterized in that the defoaming agent is selected from BYK016, BYC-5133, BYC-
One or more of 5034；The dispersing agent is selected from one or more of XS-6100, dispersing agent 5040；The preservative
Selected from MFF-08；The thickener is selected from one or more of 638 thickeners, thickener P-6366.
5. coating according to claim 1, which is characterized in that the B component includes the raw material of following parts by weight: cement 30
~40 parts, 20~50 parts of coarse whiting and 20~40 parts of talcum powder.
6. coating according to claim 1, which is characterized in that the component A of the cold resistance polymer cement waterproof paint
Mass ratio with B component is 1~2: 1.
7. coating according to claim 1, which is characterized in that the emulsion particle diameter of the cold resistance acrylic acid ester emulsion is
100~130nm.
8. a kind of preparation method for preparing any one of claim 1~7 cold resistance polymer cement waterproof paint, feature
It is, including the following steps:
(1) cold resistance acrylic acid ester emulsion is prepared；
(2) it prepares component A: weighing each raw material according to composition of raw materials and be uniformly mixed；
(3) it prepares B component: weighing each raw material according to composition of raw materials and be uniformly mixed, and be ground to particle diameter no more than 30um
?.
9. a kind of cold resistance acrylic acid ester emulsion, which is characterized in that the raw material including following parts by weight: Ks-1082~4 part,
K120.1~O.4 part, 20~35 parts of butyl acrylate, 2~6 parts of ethyl acrylate, 10~25 parts of styrene, methyl methacrylate
1~3 part of ester, 10~20 parts of organic silicon monomer, KH5702~10 part, 2~4 parts of ammonium persulfate, pH adjusting agent and deionized water 50
~80 parts.
10. a kind of method for preparing cold resistance acrylic acid ester emulsion according to any one of claims 1 to 9, which is characterized in that packet
Include the following steps:
(1) Ks-108, K12, butyl acrylate, ethyl acrylate, styrene, methyl methacrylate are added into reaction vessels
Ester, organic silicon monomer, KH570 and water stir evenly to obtain pre-emulsion；
(2) pre-emulsion for taking pre-emulsion gross mass 30~50% obtained by step (1) is warming up to 65 DEG C, and mistake in formula is added
The ammonium persulfate of ammonium sulfate total amount 1/3, in 80~85 DEG C of 5~15min of reaction；Wherein, pre-emulsion is added dropwise and ammonium persulfate is water-soluble
It is 1.5~2.5h, soaking time 1h that the time of liquid, which has altogether,；
Remaining pre-emulsion is successively added dropwise in (3) 80~90 DEG C of pre-emulsions in step (2) and according to the remaining mistake of formula ratio
The aqueous solution of ammonium sulfate keeps the temperature 0.7~1.3h at 85~90 DEG C after dripping；
(4) be cooled to 40~50 DEG C, be added pH adjusting agent to system pH be 6.5~8 to get.
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| CN201910061811.5A CN109825137A (en) | 2019-01-22 | 2019-01-22 | A kind of cold resistance polymer cement waterproof paint and preparation method thereof |
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| CN105385279A (en) * | 2015-12-24 | 2016-03-09 | 桂林市和鑫防水装饰材料有限公司 | Polymer cement waterproof paint and preparing method thereof |
| CN105419545A (en) * | 2015-12-24 | 2016-03-23 | 桂林市和鑫防水装饰材料有限公司 | Polymer cement waterproof coating and preparation method thereof |
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2019
- 2019-01-22 CN CN201910061811.5A patent/CN109825137A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101575475A (en) * | 2009-06-05 | 2009-11-11 | 陈伟忠 | Coating material for surface coating of waterproof membrane and preparation method thereof |
| CN101597944A (en) * | 2009-07-07 | 2009-12-09 | 北京科顺建筑材料有限公司 | A kind of self-adhesive waterproof tile block for building |
| CN102146247A (en) * | 2011-03-31 | 2011-08-10 | 武汉新康化学集团有限公司 | Waterproof coating containing polyether-modified silicon-acrylic soft resin and preparation method thereof |
| CN102964527A (en) * | 2012-11-02 | 2013-03-13 | 华东理工大学 | Multifunctional environment-friendly emulsion as well as preparation method and application thereof |
| CN105385279A (en) * | 2015-12-24 | 2016-03-09 | 桂林市和鑫防水装饰材料有限公司 | Polymer cement waterproof paint and preparing method thereof |
| CN105419545A (en) * | 2015-12-24 | 2016-03-23 | 桂林市和鑫防水装饰材料有限公司 | Polymer cement waterproof coating and preparation method thereof |
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Application publication date: 20190531 |