CN114163929A - Liquid rubber and preparation method and application thereof - Google Patents
Liquid rubber and preparation method and application thereof Download PDFInfo
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- CN114163929A CN114163929A CN202111348389.5A CN202111348389A CN114163929A CN 114163929 A CN114163929 A CN 114163929A CN 202111348389 A CN202111348389 A CN 202111348389A CN 114163929 A CN114163929 A CN 114163929A
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- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D195/00—Coating compositions based on bituminous materials, e.g. asphalt, tar, pitch
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Abstract
The invention provides a liquid rubber and a preparation method and application thereof. The liquid rubber includes: 30-70 parts by weight of special anion modified emulsified asphalt, 10-50 parts by weight of special anion emulsion and 20-50 parts by weight of common anion latex; wherein the tailored anionic emulsion comprises: 30-50 parts of cracked petroleum resin, 20-40 parts of terpene resin, 30-50 parts of naphthenic oil, 40-70 parts of aromatic oil, 80-100 parts of deionized water and 2-10 parts of anionic emulsifier. The invention adopts the special anion emulsion to modify the asphalt, and realizes the bonding and anti-bonding effects of the liquid rubber. The liquid rubber provided by the invention is mainly applied to water prevention of roofs, underground, indoor and anticorrosion projects and the like.
Description
Technical Field
The invention relates to the technical field of materials, in particular to liquid rubber and a preparation method and application thereof.
Background
The liquid rubber, also known as spray quick-setting rubber asphalt waterproof coating, is a waterproof, anti-seepage, anticorrosion and protective coating with excellent performance, which is prepared by adopting a special process and mixing superfine, suspension and micro-emulsion modified anionic emulsified asphalt and synthetic high molecular polymer (component A) with a special curing agent (component B) and reacting, and has excellent application effects in the aspects of roof and underground waterproof, indoor waterproof and anticorrosion engineering and the like.
At present, the bonding performance of liquid rubber has a great relationship with the waterproof effect, the higher the bonding strength of the liquid rubber and a base surface is, the better the waterproof effect is, and conversely, the lower the bonding strength is, the worse the waterproof effect is. The traditional liquid rubber often cannot be fully adhered to a base surface due to the fact that dust and stains exist on the construction base surface, and the phenomenon of hollowing exists, so that the problem of insecure adhesion is caused, great waterproof hidden dangers exist, and the problem needs to be solved urgently.
Disclosure of Invention
In order to solve the problems, the invention provides a liquid rubber and a preparation method and application thereof. The specific contents are as follows:
in a first aspect, the present invention provides a liquid rubber comprising:
30-70 parts by weight of special anion modified emulsified asphalt, 10-50 parts by weight of special anion emulsion and 20-50 parts by weight of common anion latex; wherein the tailored anionic emulsion comprises:
30-50 parts of cracked petroleum resin, 20-40 parts of terpene resin, 30-50 parts of naphthenic oil, 40-70 parts of aromatic oil, 80-100 parts of deionized water and 2-10 parts of anionic emulsifier.
Preferably, the tailored anionically modified emulsified asphalt comprises:
40-60 parts of matrix asphalt, 1-2 parts of linear SBS particles, 0.5-1 part of SBR particles, 0.5-1 part of SIS particles, 5-10 parts of naphthenic oil, 10-20 parts of aromatic oil, 40-55 parts of deionized water and 2-10 parts of anionic emulsifier.
Preferably, the base asphalt is any one of No. 70 to No. 90 base asphalt.
Preferably, the anionic emulsifier comprises one or more of carboxylate, sulfonate, sulfate and phosphate.
Preferably, the cracked petroleum resin is a mixed solution prepared by mixing C5 and C9 resins according to a mass ratio of 2: 1.
Preferably, the common anionic latex comprises: one or more of modified acrylic emulsion, polyolefin wax emulsion, terpene resin emulsion, styrene-butadiene latex and chloroprene latex.
Preferably, the liquid rubber further comprises: 0.2-3 parts of defoaming agent, 0.5-2 parts of stabilizing agent, 0.2-2 parts of anti-aging agent and 7-15% of coagulant.
Preferably, the defoaming agent is BYK-018;
preferably, the stabilizer is: the rosin soap with the solid content of 40 percent and a phosphate dispersant are compounded into a water solution according to the mass ratio of 1: 2;
preferably, the anti-aging agent is DLTP;
preferably, the coagulant is at least one of calcium chloride, zinc sulfate and magnesium sulfate.
Preferably, the preparation method of the specially-made anion modified emulsified asphalt comprises the following steps:
40-60 parts of matrix asphalt, 1-2 parts of linear SBS particles, 0.5-1 part of SBR particles, 0.5-1 part of SIS particles, 5-10 parts of naphthenic oil and 10-20 parts of aromatic oil, and stirring at 190 ℃ for 4-6 hours to prepare a first component;
dissolving 5-10 parts by weight of anionic emulsifier by deionized water to prepare a solution with pH of 11-13 and temperature of 60-80 ℃;
and mixing the first component with the solution, and performing shearing, grinding and emulsification, cooling and filtering to obtain the special anion modified emulsified asphalt.
Preferably, the method of preparing the tailored anionic emulsion comprises:
30-50 parts of cracked petroleum resin, 20-40 parts of terpene resin, 30-50 parts of naphthenic oil and 40-70 parts of aromatic oil, and stirring at the temperature of 120 ℃ and 130 ℃ for 2-3 hours to prepare a first component;
dissolving 2-10 parts by weight of anionic emulsifier in deionized water to prepare a solution with the pH of 12-13 and the temperature of 60-80 ℃;
and mixing the first component with the solution, emulsifying by shearing and grinding, cooling and filtering to obtain the special anionic emulsion.
In a second aspect, the present application provides a method for preparing the liquid rubber of the first aspect, the method comprising:
stirring 30-70 parts by weight of special anion modified emulsified asphalt, 10-50 parts by weight of special anion emulsion, 20-50 parts by weight of common anion latex, 0.2-3 parts by weight of defoaming agent, 0.5-2 parts by weight of stabilizer, 0.2-2 parts by weight of anti-aging agent and 7-15% by weight of coagulant in a stirring kettle for 0.5-1h to prepare the liquid rubber.
In a third aspect, the present application provides a use of the liquid rubber of the first aspect, wherein the use includes waterproofing of roofs, underground, indoor and anticorrosion projects.
Compared with the prior art, the invention has the following advantages:
the embodiment of the invention provides a liquid rubber and a preparation method and application thereof, wherein the liquid rubber comprises the following components: 30-70 parts by weight of special anion modified emulsified asphalt, 10-50 parts by weight of special anion emulsion and 20-50 parts by weight of common anion latex; wherein the tailored anionic emulsion comprises: 30-50 parts of cracked petroleum resin, 20-40 parts of terpene resin, 30-50 parts of naphthenic oil, 40-70 parts of aromatic oil, 80-100 parts of deionized water and 2-10 parts of anionic emulsifier. The invention modifies the basic liquid rubber, and realizes the improvement of the bonding and anti-bonding effects of the liquid rubber.
As mentioned above, the aromatic oil and the naphthenic oil with a certain proportion are added on the basis of the modified anionic emulsified asphalt, so that the liquid rubber can permeate dust and dirt with a certain thickness and is softer than the chain segment of the traditional liquid rubber; the cracked petroleum resin and the terpene resin with a certain proportion are added to enhance the bonding performance of the system, so that compared with the traditional liquid rubber, the liquid rubber disclosed by the invention has the effects of improving the bonding and anti-bonding capabilities and having a certain permeability while having good tensile strength, self-healing property and the like, and the anti-bonding capability can reach 3.0N/mm under the condition of meeting the bonding standard of 0.6mpa2(the anti-sticking capacity of the common type liquid rubber is 1.5N/mm2) The adhesive and anti-adhesive capacity of the liquid rubber is effectively improved.
The liquid rubber can permeate into the post-cast concrete under the self pressure, and finally the molecular chain segments are embedded on the two sides of the concrete base surfaces to form a waterproof layer with more excellent bonding and anti-bonding capabilities, so that the risk of water channeling and water leakage caused by construction can be greatly reduced. Therefore, the liquid rubber has the tensile strength and the self-healing property of the howls and excellent bonding and anti-adhesive properties, and can be widely applied to various engineering buildings for water resistance.
Drawings
FIG. 1 shows a flow diagram of a method for making a tailored anion modified emulsified asphalt in an embodiment of the present invention;
FIG. 2 shows a flow diagram of a method of making a tailored anionic emulsion in an embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and detailed description so that the above objects, features and advantages of the present invention can be more clearly understood. The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.
The applicant of the invention finds that the spraying quick-setting rubber asphalt waterproof material, namely the liquid rubber is a waterproof coating with good tensile property and self-healing property, but when the existing liquid rubber is applied, the adhesion is not firm due to dust and stains on a construction base surface, so that the waterproof hidden danger is caused. Therefore, it is urgently required to develop a liquid rubber which permeates base dust and stains and is excellent in adhesion property.
The present invention has been made to solve the above problems, and provides a liquid rubber having excellent adhesion and anti-tack properties.
In a first aspect, the present invention provides a liquid rubber comprising: 30-70 parts by weight of special anion modified emulsified asphalt, 10-50 parts by weight of special anion emulsion and 20-50 parts by weight of common anion latex;
the tailored anionic emulsion comprises: 30-50 parts of cracked petroleum resin, 20-40 parts of terpene resin, 30-50 parts of naphthenic oil, 40-70 parts of aromatic oil, 80-100 parts of deionized water and 2-10 parts of anionic emulsifier.
Wherein, the cracked petroleum resin and the terpene resin have the function of improving the bonding capacity of the asphalt; the naphthenic oil and the aromatic oil have the functions of accelerating the dissolving capacity of the resin in a system and enabling molecular chain segments of asphalt and latex to be softer so as to be easier to permeate impurities such as dust. The anionic latex functions to improve heat resistance and stretchability of the coating.
In the embodiment of the present invention, preferably, the specially prepared anion modified emulsified asphalt comprises:
40-60 parts of matrix asphalt, 1-2 parts of linear SBS particles, 0.5-1 part of SBR particles, 0.5-1 part of SIS particles, 5-10 parts of naphthenic oil, 10-20 parts of aromatic oil, 40-55 parts of deionized water and 2-10 parts of anionic emulsifier.
The SBR, the SBS and the SIS have the functions of increasing the overall strength and the elongation performance of a system, so that the coating is not easy to break under large deformation and has certain anti-aging capacity; the naphthenic oil and aromatic oil have the function of improving the dissolving capacity of rubber particles in a system.
In the embodiment of the present invention, preferably, the base asphalt is any one of No. 70 to No. 90 base asphalt.
In the embodiment of the present invention, preferably, the anionic emulsifier includes one or more of carboxylate, sulfonate, sulfate, and phosphate.
In the embodiment of the invention, preferably, the cracked petroleum resin is a mixed solution prepared by compounding C5 and C9 resin according to a mass ratio of 2: 1.
In the embodiment of the present invention, preferably, the common anionic latex includes: one or more of modified acrylic emulsion, polyolefin wax emulsion, terpene resin emulsion, styrene-butadiene latex and chloroprene latex.
In the embodiment of the present invention, preferably, the liquid rubber further includes: 0.2-3 parts of defoaming agent, 0.5-2 parts of stabilizing agent, 0.2-2 parts of anti-aging agent and 7-15% of coagulant.
The function of the defoaming agent is to eliminate the foam in the waterproof coating system, so that the coating has less foam and is easy to spray and construct; the stabilizer is used for promoting the intermiscibility of the latex, the special anionic emulsion and the modified emulsified asphalt and increasing the stability of the system, so that the latex, the special anionic emulsion and the modified emulsified asphalt are not separated, and the waterproof coating system is more stable; the anti-aging agent has the function of increasing the anti-aging capacity.
In the embodiment of the invention, preferably, the defoaming agent is BYK-018;
in the embodiment of the present invention, preferably, the stabilizer is: the rosin soap with the solid content of 40 percent and a phosphate dispersant are compounded into a water solution according to the mass ratio of 1: 2;
in the embodiment of the present invention, preferably, the antioxidant is DLTP;
in the embodiment of the present invention, preferably, the coagulant is at least one of calcium chloride, zinc sulfate and magnesium sulfate.
In the embodiment of the present invention, preferably, the preparation method of the specially-made anion modified emulsified asphalt is shown in fig. 1, and includes:
s11, stirring 40-60 parts by weight of matrix asphalt, 1-2 parts by weight of linear SBS particles, 0.5-1 part by weight of SBR particles, 0.5-1 part by weight of SIS particles, 5-10 parts by weight of naphthenic oil and 10-20 parts by weight of aromatic oil at 190 ℃ for 4-6h to prepare a first component;
s12, dissolving 5-10 parts by weight of anionic emulsifier by deionized water to prepare a solution with pH of 11-13 and temperature of 60-80 ℃;
and S13, mixing the first component with the solution, emulsifying by shearing and grinding, cooling and filtering to obtain the special anion modified emulsified asphalt.
In the embodiment of the present invention, preferably, the preparation method of the tailored anionic emulsion is shown in fig. 2, and includes:
s21, stirring 30-50 parts of cracked petroleum resin, 20-40 parts of terpene resin, 30-50 parts of naphthenic oil and 40-70 parts of aromatic oil at the temperature of 120-;
s22, dissolving 2-10 parts by weight of anionic emulsifier by deionized water to prepare a solution with pH of 12-13 and temperature of 60-80 ℃;
and S23, mixing the first component with the solution, emulsifying by shearing and grinding, cooling and filtering to obtain the special anionic emulsion.
In a second aspect, the present application provides a method for preparing the liquid rubber of the first aspect, the method comprising:
stirring 30-70 parts by weight of special anion modified emulsified asphalt, 10-50 parts by weight of special anion emulsion, 20-50 parts by weight of common anion latex, 0.2-3 parts by weight of defoaming agent, 0.5-2 parts by weight of stabilizer, 0.2-2 parts by weight of anti-aging agent and 7-15% by weight of coagulant in a stirring kettle for 0.5-1h to prepare the liquid rubber.
In order to make the present invention more understandable to those skilled in the art, a liquid rubber and a preparation method thereof according to the present invention are illustrated below by specific examples.
Firstly, the process and the formula of the special anion modified emulsified asphalt are as follows:
heating 40 parts of No. 70 matrix asphalt, 1 part of linear SBS particles, 0.5 part of SBR particles, 0.5 part of SIS particles, 5 parts of naphthenic oil and 10 parts of aromatic oil to 170-190 ℃, stirring for 4-6 hours to ensure full swelling and melting, preparing 5 parts of anionic emulsifier into an aqueous solution, adjusting the pH value to 11-13, and heating to 60-80 ℃; and simultaneously shearing, grinding and emulsifying the two materials by a colloid mill, discharging, cooling and filtering to obtain the specially-prepared anion modified emulsified asphalt for later use.
In this embodiment, when the specially-made anion modified emulsified asphalt is prepared, the addition amount of the above components can be adjusted according to the actual situation, and the adjustment range of the above components satisfies: 40-60 parts of matrix asphalt, 1-2 parts of linear SBS particles, 0.5-1 part of SBR particles, 0.5-1 part of SIS particles, 5-10 parts of naphthenic oil, 10-20 parts of aromatic oil, 40-55 parts of deionized water and 2-10 parts of anionic emulsifier; and the base asphalt can be any one of No. 70-90.
Secondly, the process and the formula of the special anion emulsion are as follows:
heating 30 parts of cracked petroleum resin, 20 parts of terpene resin, 30 parts of naphthenic oil and 40 parts of aromatic oil to 120-130 ℃, stirring for 2-3 hours to ensure full swelling and melting, preparing 2 parts of anionic emulsifier into aqueous solution, adjusting the pH value to 12-13, and heating to 60-80 ℃; meanwhile, shearing, grinding and emulsifying the two by a colloid mill, discharging, cooling and filtering to obtain the specially-prepared anionic emulsion for later use.
In this embodiment, when the special anionic emulsion is prepared, the addition amount of the above components may be adjusted according to actual conditions, and the adjustment range is based on 100 parts by weight of the anionic emulsion, and satisfies the following requirements: 30-50 parts of cracked petroleum resin, 20-40 parts of terpene resin, 30-50 parts of naphthenic oil, 40-70 parts of aromatic oil, 80-100 parts of deionized water and 2-10 parts of anionic emulsifier. Wherein the cracked petroleum resin is a mixed solution prepared by C5 and C9 resins according to the mass ratio of 2: 1.
The preparation process and formula of the waterproof coating comprise the following steps:
example 1: 60 parts of special anion modified emulsified asphalt, 25 parts of special anion emulsion and 25 parts of common anion latex, wherein the weight ratio of the common anion latex is as follows: the neoprene latex is 1:2, 1 part of defoaming agent, 2 parts of stabilizing agent and 1 part of anti-aging agent, stirring the mixture in a stirring kettle for 0.5 to 1 hour to obtain the waterproof coating, and spraying the waterproof coating and 12 parts of calcium chloride coagulant by using specific spraying equipment when in use. In the embodiment, the prepared liquid rubber has the bonding capacity of 0.6mpa and the anti-bonding capacity of 3.0N/mm2。
Example 2: 50 parts of special anion modified emulsified asphalt, 20 parts of special anion emulsion and common anion latex, wherein the weight ratio of the modified acrylic emulsion is as follows: styrene-butadiene latex: the neoprene latex is 1: 1: 3, 40 parts of a proportional mixture, 1.5 parts of a defoaming agent, 2.5 parts of a stabilizing agent and 1.5 parts of an anti-aging agent, stirring in a stirring kettle for 0.5-1 hour to obtain a waterproof coating, and spraying the waterproof coating and 15 parts of a magnesium sulfate coagulant through special spraying equipment when in use. In the embodiment, the prepared liquid rubber has the bonding capacity of 0.6mpa and the anti-bonding capacity of 3.0N/mm2。
Example 3: 30 parts of special anion modified emulsified asphalt, 50 parts of special anion emulsion and 50 parts of common anion latex, wherein the weight ratio of the common anion latex is as follows: the neoprene latex is 1:2, 0.5 part of defoaming agent, 0.5 part of stabilizing agent and 2 parts of anti-aging agent, stirring the mixture in a stirring kettle for 0.5 to 1H to obtain the waterproof coating, and spraying the waterproof coating and 7 parts of calcium chloride coagulant by using special spraying equipment when in use. In the present example, the bonding of the prepared liquid rubberThe capacity can reach 0.6mpa, and the anti-adhesion capacity can reach 3.0N/mm2。
Example 4: 70 parts of special anion modified emulsified asphalt, 10 parts of special anion emulsion and 10 parts of common anion latex, wherein the weight ratio of the modified acrylic emulsion is as follows: styrene-butadiene latex: the neoprene latex is 1: 1: 3, 3 parts of defoaming agent, 2 parts of stabilizing agent and 2 parts of anti-aging agent, stirring the mixture in a stirring kettle for 0.5 to 1H to obtain the waterproof coating, and spraying the waterproof coating and 15 parts of magnesium sulfate coagulant by using specific spraying equipment when in use. In the embodiment, the prepared liquid rubber has the bonding capacity of 0.6mpa and the anti-bonding capacity of 3.0N/mm2。
In the above examples, the adhesive properties of the prepared liquid rubber were tested according to the method described in 7.1A of GB/T16777-2008.
For simplicity of explanation, the method embodiments are described as a series of acts or combinations, but those skilled in the art will appreciate that the present invention is not limited by the order of acts, as some steps may occur in other orders or concurrently in accordance with the invention. Further, those skilled in the art will appreciate that the embodiments described in the specification are preferred embodiments and that the acts and elements referred to are not necessarily required to practice the invention.
The liquid rubber and the preparation method thereof provided by the invention are described in detail, the principle and the implementation mode of the invention are explained by applying specific examples, and the description of the examples is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (12)
1. A liquid rubber, characterized in that the liquid rubber comprises: 30-70 parts by weight of special anion modified emulsified asphalt, 10-50 parts by weight of special anion emulsion and 20-50 parts by weight of common anion latex;
the tailored anionic emulsion comprises: 30-50 parts of cracked petroleum resin, 20-40 parts of terpene resin, 30-50 parts of naphthenic oil, 40-70 parts of aromatic oil, 80-100 parts of deionized water and 2-10 parts of anionic emulsifier.
2. The liquid rubber of claim 1, wherein the tailored anionically modified emulsified asphalt comprises:
40-60 parts of matrix asphalt, 1-2 parts of linear SBS particles, 0.5-1 part of SBR particles, 0.5-1 part of SIS particles, 5-10 parts of naphthenic oil, 10-20 parts of aromatic oil, 40-55 parts of deionized water and 2-10 parts of anionic emulsifier.
3. The liquid rubber according to claim 2, wherein the base asphalt is any one of a number 70 to a number 90.
4. The liquid rubber according to claim 1 or 2, wherein the anionic emulsifier comprises one or more of carboxylate, sulfonate, sulfate and phosphate.
5. The liquid rubber according to claim 1, wherein the cracked petroleum resin is a mixed solution of C5 and C9 resins in a mass ratio of 2: 1.
6. The liquid rubber according to claim 1, wherein the common anionic latex comprises: one or more of modified acrylic emulsion, polyolefin wax emulsion, terpene resin emulsion, styrene-butadiene latex and chloroprene latex.
7. The liquid rubber according to any one of claims 1 to 6, further comprising: 0.2-3 parts of defoaming agent, 0.5-2 parts of stabilizing agent, 0.2-2 parts of anti-aging agent and 7-15% of coagulant.
8. The liquid rubber according to claim 7,
the defoaming agent is BYK-018;
the stabilizer is as follows: the rosin soap with the solid content of 40 percent and a phosphate dispersant are compounded into a water solution according to the mass ratio of 1: 2;
the anti-aging agent is DLTP;
the coagulant is at least one of calcium chloride, zinc sulfate and magnesium sulfate.
9. The liquid rubber of claim 1, wherein the method for preparing the specially prepared anionic modified emulsified asphalt comprises the following steps:
40-60 parts of matrix asphalt, 1-2 parts of linear SBS particles, 0.5-1 part of SBR particles, 0.5-1 part of SIS particles, 5-10 parts of naphthenic oil and 10-20 parts of aromatic oil, and stirring at 190 ℃ for 4-6 hours to prepare a first component;
dissolving 5-10 parts by weight of anionic emulsifier by deionized water to prepare a solution with pH of 11-13 and temperature of 60-80 ℃;
and mixing the first component with the solution, and performing shearing, grinding and emulsification, cooling and filtering to obtain the special anion modified emulsified asphalt.
10. The liquid rubber of claim 1, wherein the process for preparing the tailored anionic emulsion comprises:
30-50 parts of cracked petroleum resin, 20-40 parts of terpene resin, 30-50 parts of naphthenic oil and 40-70 parts of aromatic oil, and stirring at the temperature of 120 ℃ and 130 ℃ for 2-3 hours to prepare a first component;
dissolving 2-10 parts by weight of anionic emulsifier in deionized water to prepare a solution with the pH of 12-13 and the temperature of 60-80 ℃;
and mixing the first component with the solution, emulsifying by shearing and grinding, cooling and filtering to obtain the special anionic emulsion.
11. A method for preparing the liquid rubber according to any one of claims 1 to 10, wherein the method comprises:
stirring 30-70 parts by weight of special anion modified emulsified asphalt, 10-50 parts by weight of special anion emulsion, 20-50 parts by weight of common anion latex, 0.2-3 parts by weight of defoaming agent, 0.5-2 parts by weight of stabilizer, 0.2-2 parts by weight of anti-aging agent and 7-15% by weight of coagulant in a stirring kettle for 0.5-1h to prepare the liquid rubber.
12. Use of the liquid rubber according to any one of claims 1 to 10 for waterproofing of roofs, underground, indoor and anticorrosive works, etc., wherein the liquid rubber according to any one of claims 1 to 10 is used for waterproofing of roofs, underground, indoor and anticorrosive works, etc.
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| CN116063926A (en) * | 2023-01-17 | 2023-05-05 | 大禹伟业(北京)国际科技有限公司 | Spray-coating quick-setting rubber asphalt waterproof paint and preparation method thereof |
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