CN116177955A - Strength growth type polyurethane cement mortar facade repair material and preparation method thereof - Google Patents
Strength growth type polyurethane cement mortar facade repair material and preparation method thereof Download PDFInfo
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- CN116177955A CN116177955A CN202211675210.1A CN202211675210A CN116177955A CN 116177955 A CN116177955 A CN 116177955A CN 202211675210 A CN202211675210 A CN 202211675210A CN 116177955 A CN116177955 A CN 116177955A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/12—Nitrogen containing compounds organic derivatives of hydrazine
- C04B24/125—Compounds containing one or more carbon-to-nitrogen double or triple bonds, e.g. imines
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/28—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/32—Polyethers, e.g. alkylphenol polyglycolether
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/72—Repairing or restoring existing buildings or building materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention discloses a strength growth type polyurethane cement mortar facade repairing material and a preparation method thereof, wherein the repairing material is prepared from the following raw materials in parts by weight: 15-42 parts of double-component thermosetting polyurethane, 50-70 parts of fine sand, 30-50 parts of cement and 1.15-4.26 parts of thixotropic agent; the double-component thermosetting polyurethane consists of a polyol component and an isocyanate component, wherein the double-component thermosetting polyurethane consists of 10-28 parts of the polyol component and 5-14 parts of the isocyanate component in parts by weight; the total weight of the fine sand and the cement is 100 parts. The repairing material prepared by adopting the strength growth type polyurethane cement mortar facade repairing material and the preparation method has the advantages of high strength, strong corrosion resistance, strong cohesiveness, high impermeability, strong freezing resistance, good wear resistance, high impact resistance, convenient construction and the like, has good sagging resistance, can generate hydration reaction with permeated water, and continuously enhances the strength of the repairing material.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a strength growth type polyurethane cement mortar facade repair material and a preparation method thereof.
Background
The bridge protection wall in northeast cold areas of China has more or less serious peeling phenomena due to long-term freezing and thawing cycle, snow-removing salt corrosion and snow-removing vehicle rubbing. If the peeled bridge protection wall is not repaired as soon as possible, rainwater can infiltrate into the bridge deck plate through the protection wall, corrode steel bars in the steel bridge deck or the concrete bridge deck plate, and serious potential safety hazards are caused to the bridge structure. The structures with vertical surfaces such as bridge protection walls are mostly cement concrete structures. At present, the repairing material of the bridge protection wall in the cold region mainly comprises cement mortar, modified cement mortar, epoxy resin mortar and the like, but the bridge protection wall is peeled again due to the problems of insufficient bonding strength, insufficient freezing resistance, insufficient light resistance, insufficient impact resistance and the like of the repairing material within 1-2 years after repairing, and the long-term performance is insufficient. Therefore, there is a need to develop a bridge protection wall repairing material with high durability.
The thermosetting polyurethane cement mortar is a strength growth type facade repairing material which is formed by mixing, forming and curing thermosetting two-component polyurethane, fine sand, cement and thixotropic agent, and can repair a concrete structure with facade damage, such as a bridge protection wall. The thermosetting polyurethane cement mortar combines the excellent wear resistance, cohesiveness, toughness, strength and corrosion resistance of polyurethane and the sagging resistance of thixotropic agents, and has the advantages of high strength, strong corrosion resistance, strong cohesiveness, high impermeability, strong freezing resistance, good sagging resistance, good wear resistance, high impact resistance, high toughness, convenient construction and the like. In addition, the thermosetting polyurethane cement mortar inevitably suffers from erosion of moisture in the air and even rainwater in the service process, at this time, the internal cement and the water permeated into the internal cement undergo hydration reaction, and the strength of the thermosetting polyurethane cement mortar is continuously enhanced, namely the thermosetting polyurethane cement mortar has the strength growth characteristic.
Disclosure of Invention
The invention aims to provide a strength growth type polyurethane cement mortar facade repair material and a preparation method thereof, and the prepared repair material has the advantages of high strength, strong corrosion resistance, strong cohesiveness, high impermeability, strong freezing resistance, good wear resistance, high impact resistance, convenient construction and the like, has good sagging resistance, can generate hydration reaction with permeated water, and continuously enhances the strength of the repair material.
In order to achieve the purpose, the invention provides a strength growth type polyurethane cement mortar facade repairing material which is prepared from the following raw materials in parts by weight:
15-42 parts of two-component thermosetting polyurethane
50 to 70 parts of fine sand
30-50 parts of cement
1.15 to 4.26 portions of thixotropic agent;
the double-component thermosetting polyurethane consists of a polyol component and an isocyanate component, wherein the double-component thermosetting polyurethane consists of 10-28 parts of the polyol component and 5-14 parts of the isocyanate component in parts by weight; the total weight of the fine sand and the cement is 100 parts.
Preferably, the repair material comprises 50 parts of fine sand, 50 parts of cement, 28 parts of polyol component, 14 parts of isocyanate component and 4 parts of thixotropic agent.
Preferably, the repairing material comprises 60 parts of fine sand, 40 parts of cement, 20 parts of polyol component, 10 parts of isocyanate component and 3 parts of thixotropic agent.
Preferably, the repair material comprises 70 parts of fine sand, 30 parts of cement, 14 parts of polyol component, 7 parts of isocyanate component and 3.5 parts of thixotropic agent.
Preferably, the fine sand is one or more of river sand, machine-made sand, quartz sand and carborundum, and the grain size is 0.075-0.6 mm.
Preferably, the cement is one of white cement and ordinary portland cement, and is one or more of 325, 425 and 525.
Preferably, the polyol component is a polyether polyol and an anti-ultraviolet aging agent; the isocyanate is one or two of diphenylmethane diisocyanate and toluene diisocyanate.
Preferably, the thixotropic agent is one of silane modified urea solution thixotropic agent, organic bentonite thixotropic agent, polyurea thixotropic agent and polyamide wax thixotropic agent.
The strength growth type polyurethane cement mortar facade repair material comprises the following preparation steps:
s1: placing the fine sand into a drying oven at 100-120 ℃ for drying treatment, and naturally cooling to room temperature after the fine sand is constant in weight to obtain dry fine sand;
s2: mixing dry fine sand and cement according to the weight ratio, stirring, adding a polyol component after stirring uniformly, and continuously stirring for 2-3 min, and obtaining a complex after stirring uniformly;
s3: according to the weight ratio, the isocyanate component and the thixotropic agent are sequentially added into the complex, and the mixture is stirred for 2 to 3 minutes, and after the mixture is uniformly stirred, the strength growth type polyurethane cement mortar facade repair material is obtained.
Preferably, the exposure time of the strength growth type polyurethane cement mortar facade repair material is not more than 25min.
Therefore, the strength growth type polyurethane cement mortar facade repairing material and the preparation method thereof have the following technical effects:
(1) The polyol component is added into the mixture of the fine sand and the cement, so that the fine sand-cement mixture is fully infiltrated by the polyol component, the infiltrated complex can be stored for 2-3 days at the sealed room temperature, the site construction time is greatly shortened, the possibility of uneven mixing caused by improper operation of constructors is avoided to the greatest extent, the stirring time of isocyanate and the complex is shortened, the curing rate of the repairing material is effectively controlled, and the workability of the repairing material in construction is ensured.
(2) The thixotropic agent is added into the strength growth type polyurethane cement mortar facade repairing material, so that the repairing material becomes thin during construction, the construction workability of the repairing material is further improved, meanwhile, the repairing material becomes thick after construction, the sagging resistance of the repairing material is ensured, and the problem that the repairing material is easy to fall off during repairing of a concrete facade structure is solved.
(3) The original components of the repairing material contain no moisture, the repairing material inevitably suffers from the corrosion of moisture in the air and even rainwater in the service process, and the internal cement of the repairing material can generate hydration reaction with the moisture permeated into the repairing material, so that the strength of the repairing material is continuously enhanced, and the thermosetting polyurethane cement mortar repairing material has the strength growth characteristic.
The technical scheme of the invention is further described in detail through examples.
Detailed Description
The technical scheme of the invention is further described below by examples.
Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art. Such other embodiments are also within the scope of the present invention.
It should also be understood that the above-mentioned embodiments are only for explaining the present invention, the protection scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the protection scope of the present invention by equally replacing or changing the technical scheme and the inventive concept thereof within the scope of the present invention.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be considered part of the specification where appropriate.
The disclosures of the prior art documents cited in the present specification are incorporated by reference in their entirety into the present invention and are therefore part of the present disclosure.
Example 1
The strength growth type polyurethane cement mortar facade repair material comprises the following components in parts by weight: 60 parts of fine sand, 40 parts of cement, 14 parts of polyol component, 7 parts of isocyanate component and 2.5 parts of thixotropic agent. Wherein, the fine sand is river sand with the nominal grain size of 0.075-0.6 mm, the cement is common silicate cement with the mark of 325, the polyol component is 847 type combined polyether polyol produced by Wanhua chemical group, the isocyanate component is 8215 type isocyanate produced by Wanhua chemical group, and the thixotropic agent is BYK7410ET silane modified urea solution thixotropic agent.
The method for preparing the strength growth type polyurethane cement mortar facade repair material comprises the following preparation steps:
(1) Placing the fine sand into a drying oven at 100-120 ℃ for drying treatment, and naturally cooling to room temperature after the fine sand is constant in weight to obtain dry fine sand;
(2) According to 60 parts: mixing 40 parts by weight of dry fine sand with cement, stirring by using a handheld electric stirrer at the rotating speed of 1000rpm/min, adding 14 parts of polyol component after stirring uniformly, continuously stirring for 2.5min, and obtaining a complex after stirring uniformly;
(3) And sequentially adding 7 parts of isocyanate component and 2.5 parts of thixotropic agent into the complex, stirring for 3min by adopting a handheld electric stirrer at the rotating speed of 1000rpm/min, and obtaining the strength growth type polyurethane cement mortar facade repair material after uniform stirring.
The prepared strength-growing polyurethane cement mortar facade repair material has a cube compressive strength of 34.72MPa, an interface flexural tensile strength of 2.39MPa and a thermal expansion coefficient of 26.33 multiplied by 10, referring to the standard of cement mortar strength test method (ISO method) (GB/T17671-2021) and the standard of building mortar basic performance test method (JGJ/T70-2009) -6 ℃ -1 The freezing resistance grade is F25, and the construction allowed maximum exposure time is 25min.
Example two
The strength growth type polyurethane cement mortar facade repair material comprises the following components in parts by weight: 60 parts of fine sand, 40 parts of cement, 20 parts of polyol component, 10 parts of isocyanate component and 3 parts of thixotropic agent. Wherein, the fine sand is river sand with the nominal grain size of 0.075-0.6 mm, the cement is white cement with the mark of 325, the polyol component is 847 type combined polyether polyol produced by Wanhua chemical group, the isocyanate component is 8215 type isocyanate produced by Wanhua chemical group, and the thixotropic agent is German Bei Shi-410 polyurea thixotropic agent.
The method for preparing the strength growth type polyurethane cement mortar facade repair material comprises the following preparation steps:
(1) Placing the fine sand into a drying oven at 100-120 ℃ for drying treatment, and naturally cooling to room temperature after the weight of the fine sand is constant to obtain dried fine sand;
(2) According to 60 parts: mixing the dried fine sand with cement in a weight ratio of 40 parts, stirring by adopting a handheld electric stirrer at a rotating speed of 1000rpm/min, adding 20 parts of polyol component after stirring uniformly, and continuously stirring for 3min to obtain a complex after stirring uniformly;
(3) 10 parts of isocyanate component and 2.5 parts of thixotropic agent are sequentially added into the complex, the mixture is stirred for 3min by adopting a handheld electric stirrer, the rotating speed is 1000rpm/min, and after the mixture is uniformly stirred, the strength growth type polyurethane cement mortar facade repair material is obtained.
Reference to cement mortar strength test method (ISO method) (GBT17671-2021) standard and the building mortar basic performance test method (JGJ/T70-2009) standard, the prepared strength-growing polyurethane cement mortar facade repair material has a cube compressive strength of 35.61MPa, an interface flexural tensile strength of 2.68MPa and a thermal expansion coefficient of 25.32×10 -6 ℃ -1 The freezing resistance grade is F25, and the construction allowed maximum exposure time is 20min.
Therefore, the strength growth type polyurethane cement mortar facade repair material and the preparation method thereof have the advantages of high strength, strong corrosion resistance, strong cohesiveness, high impermeability, strong freezing resistance, good wear resistance, high impact resistance, convenient construction and the like. The anti-sagging performance is good, and the vertical face of the concrete structure can be repaired. In the service process, cement can generate hydration reaction with permeated water, and the strength of the repairing material is continuously enhanced.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention and not for limiting it, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that: the technical scheme of the invention can be modified or replaced by the same, and the modified technical scheme cannot deviate from the spirit and scope of the technical scheme of the invention.
Claims (10)
1. A strength growth type polyurethane cement mortar facade repair material is characterized in that: the repairing material is prepared from the following raw materials in parts by weight:
15-42 parts of two-component thermosetting polyurethane
50 to 70 parts of fine sand
30-50 parts of cement
1.15 to 4.26 portions of thixotropic agent;
the double-component thermosetting polyurethane consists of a polyol component and an isocyanate component, wherein the double-component thermosetting polyurethane consists of 10-28 parts of the polyol component and 5-14 parts of the isocyanate component in parts by weight; the total weight of the fine sand and the cement is 100 parts.
2. The strength-growing polyurethane cement mortar facade repair material according to claim 1, wherein: the repairing material comprises 50 parts of fine sand, 50 parts of cement, 28 parts of polyol component, 14 parts of isocyanate component and 4 parts of thixotropic agent.
3. The strength-growing polyurethane cement mortar facade repair material according to claim 1, wherein: the repairing material comprises 60 parts of fine sand, 40 parts of cement, 20 parts of polyol component, 10 parts of isocyanate component and 3 parts of thixotropic agent.
4. The strength-growing polyurethane cement mortar facade repair material according to claim 1, wherein: the repairing material comprises 70 parts of fine sand, 30 parts of cement, 14 parts of polyol component, 7 parts of isocyanate component and 3.5 parts of thixotropic agent.
5. The strength-growing polyurethane cement mortar facade repair material according to claim 1, wherein: the fine sand is one or more of river sand, machine-made sand, quartz sand and silicon carbide, and the grain size is 0.075-0.6 mm.
6. The strength-growing polyurethane cement mortar facade repair material according to claim 1, wherein: the cement is one of white cement and ordinary silicate cement, and is one or more of 325, 425 and 525.
7. The strength-growing polyurethane cement mortar facade repair material according to claim 2, wherein: the polyol component is polyether polyol and an anti-ultraviolet aging agent; the isocyanate is one or two of diphenylmethane diisocyanate and toluene diisocyanate.
8. The strength-growing polyurethane cement mortar facade repair material according to claim 1, wherein: the thixotropic agent is one of silane modified urea solution thixotropic agent, organic bentonite thixotropic agent, polyurea thixotropic agent and polyamide wax thixotropic agent.
9. The method for preparing the strength-growing polyurethane cement mortar facade repair material according to any one of claims 1 to 8, which is characterized in that: the preparation method comprises the following preparation steps:
s1: placing the fine sand into a drying oven at 100-120 ℃ for drying treatment, and naturally cooling to room temperature after the fine sand is constant in weight to obtain dry fine sand;
s2: mixing dry fine sand and cement according to the weight ratio, stirring, adding a polyol component after stirring uniformly, and continuously stirring for 2-3 min, and obtaining a complex after stirring uniformly;
s3: according to the weight ratio, the isocyanate component and the thixotropic agent are sequentially added into the complex, and the mixture is stirred for 2 to 3 minutes, and after the mixture is uniformly stirred, the strength growth type polyurethane cement mortar facade repair material is obtained.
10. The strength-growing polyurethane cement mortar facade repair material prepared according to claim 9, which is characterized in that: the exposure time of the strength growth type polyurethane cement mortar facade repair material is not more than 25min.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116751344A (en) * | 2023-08-18 | 2023-09-15 | 成都飞机工业（集团）有限责任公司 | Reinforcing agent for acrylic plate, preparation method of reinforcing agent and acrylic plate assembling method |
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| CN102167544A (en) * | 2010-12-31 | 2011-08-31 | 中国铁道科学研究院铁道建筑研究所 | Polyurethane resin mortar for cement base material repairing |
| CN111675801A (en) * | 2019-11-14 | 2020-09-18 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Polyurethane cement composite repairing material |
| CN114316777A (en) * | 2022-01-28 | 2022-04-12 | 四川迈铁龙科技有限公司 | Spraying type polyurethane waterproof coating and preparation method and construction method thereof |
| CN114410210A (en) * | 2021-12-31 | 2022-04-29 | 北京东方雨虹防水技术股份有限公司 | Bi-component anti-sagging polyurethane waterproof coating and preparation method thereof |
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2022
- 2022-12-26 CN CN202211675210.1A patent/CN116177955A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102167544A (en) * | 2010-12-31 | 2011-08-31 | 中国铁道科学研究院铁道建筑研究所 | Polyurethane resin mortar for cement base material repairing |
| CN111675801A (en) * | 2019-11-14 | 2020-09-18 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Polyurethane cement composite repairing material |
| CN114410210A (en) * | 2021-12-31 | 2022-04-29 | 北京东方雨虹防水技术股份有限公司 | Bi-component anti-sagging polyurethane waterproof coating and preparation method thereof |
| CN114316777A (en) * | 2022-01-28 | 2022-04-12 | 四川迈铁龙科技有限公司 | Spraying type polyurethane waterproof coating and preparation method and construction method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116751344A (en) * | 2023-08-18 | 2023-09-15 | 成都飞机工业（集团）有限责任公司 | Reinforcing agent for acrylic plate, preparation method of reinforcing agent and acrylic plate assembling method |
| CN116751344B (en) * | 2023-08-18 | 2023-12-08 | 成都飞机工业（集团）有限责任公司 | Reinforcing agent for acrylic plate, preparation method of reinforcing agent and acrylic plate assembling method |
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