CN110615639A - Epoxy mortar for underwater repair and preparation method thereof - Google Patents
Epoxy mortar for underwater repair and preparation method thereof Download PDFInfo
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- CN110615639A CN110615639A CN201910885358.XA CN201910885358A CN110615639A CN 110615639 A CN110615639 A CN 110615639A CN 201910885358 A CN201910885358 A CN 201910885358A CN 110615639 A CN110615639 A CN 110615639A
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Classifications
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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
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/10—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B26/14—Polyepoxides
-
- 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
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/74—Underwater applications
-
- 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
- C04B2201/10—Mortars, concrete or artificial stone characterised by specific physical values for the viscosity
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Epoxy Resins (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses an epoxy mortar for underwater repair and a preparation method thereof, wherein the epoxy mortar comprises the following substances in parts by weight: 98-102 parts of epoxy resin, 28-32 parts of curing agent, 8-12 parts of diluent, 2-6 parts of coupling agent, 72-130 parts of cement and 288-518 parts of standard sand. The preparation method comprises the following steps: a. placing the weighed fillers such as sand, cement and the like into a stirring barrel to be uniformly stirred; b. sequentially adding the precisely weighed epoxy resin main agent and the curing agent into a stirring barrel; c. stirring evenly and standing for 4-8 min, wherein the stirring speed is 40-50 r/min, and the power is 2-3 kW. The epoxy mortar prepared by the 593 curing agent has good underwater bonding performance, the water absorption rate and the water dissolution rate of a cured product generated by the reaction with the epoxy resin are relatively low, and the prepared epoxy mortar can generate good bonding strength underwater; the diluent can improve the fluidity of the epoxy mortar and improve the spreading, infiltration and infiltration capacity of the bonding interface of the epoxy mortar, thereby improving the water discharge capacity of the bonding interface.
Description
Technical Field
The invention relates to an epoxy mortar material and a preparation method thereof, in particular to an epoxy mortar for underwater repair and a preparation method thereof.
Background
The water flow velocity in western regions of China is high, and a large amount of suspended substances and bed carriers such as mud, sand, stones and the like exist in water, so that the water works such as water release buildings, water delivery tunnels, water delivery channels and the like are seriously washed and abraded and damaged, the surface of a concrete structure is greatly corroded, and the safe operation of the engineering is seriously influenced. At present, most of epoxy mortar can only be used in a dry environment, and the problem of insufficient bonding strength exists in a wet or underwater environment. The epoxy mortar is in an aqueous environment for a long time, and the durability and the bonding stability of the epoxy mortar are affected. Due to the limitation of the operation requirement or the actual working condition of the hydraulic structure, water is often generated in the actual engineering, and part of repairing work needs to be carried with water, such as repairing of an upstream water retaining gate slot, repairing of a wet surface of an overflow surface of a dam, bonding and repairing of an underwater area of an underground structure and the like.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects in the prior art, the invention aims to provide the epoxy mortar for underwater repair with good cohesiveness and durability, and the invention also aims to provide a simple and convenient preparation method of the epoxy mortar for underwater repair.
The technical scheme is as follows: the invention relates to an epoxy mortar for underwater repair, which comprises the following substances in parts by weight: 98-102 parts of epoxy resin, 28-32 parts of curing agent, 8-12 parts of diluent, 2-6 parts of coupling agent, 72-130 parts of cement and 288-518 parts of standard sand.
Wherein the epoxy resin is E-51 type epoxy resin, and the epoxy value is 0.48-0.54 mol/100 g. The curing agent is any one of 593, 531, T-31, T-33 and JH-5553 epoxy modified fatty amine, preferably 593 epoxy modified fatty amine, and the amine value is 500-600 MgKOH/g. The diluent is 692 or 501 diluent, preferably 692 diluent, and the epoxy value is 0.43eq/100 g. The coupling agent is any one of KH-550, KH-560 and KH-570Preferably KH-550 coupling agent with density of 0.944-0.950 g/cm3. The cement is ordinary portland cement type P.O 42.5.5. The standard sand is sk-023N type standard sand.
The preparation method of the epoxy mortar for underwater repair comprises the following steps:
a. placing the weighed sand and cement filler into a stirring barrel and uniformly stirring;
b. sequentially adding the precisely weighed epoxy resin, diluent, coupling agent and curing agent into a stirring barrel;
c. and (3) uniformly stirring by adopting an electric stirrer and standing for 4-8 min, wherein the rotating speed of the stirrer is 40-50 r/min, the power of the stirrer is 2-3 kW, the epoxy mortar at the bottom and on the wall of the barrel is uniformly stirred, the amount of the epoxy mortar prepared each time is not too large, the epoxy mortar is required to be prepared at any time, few preparation is required frequently, and the stirring speed is high.
The working principle is as follows: epoxy resins contain highly reactive epoxy groups and therefore in many cases generate chemical bonding forces, and also contain hydroxyl groups and ether bonds, which tend to form hydrogen bonds. In a dry environment, the epoxy-based fluid may be directly contacted by the repair subject, creating intermolecular, hydrogen, and chemical bonding forces. However, unlike the dry environment, the water environment has a certain specificity, and a water film exists between the epoxy base liquid and the object to be repaired, and the epoxy base liquid and the object to be repaired cannot be in direct contact with each other. The epoxy mortar mainly depends on two modes of self-drainage of epoxy base liquid and water absorption of water absorption filler for removing the water on the surface of the object to be repaired, and the idea is to remove or absorb the water between the epoxy mortar and the object to be repaired so as to achieve the aim of contact between the epoxy mortar and the object to be repaired. However, if the water on the surface of the object to be repaired is difficult to be removed by the above two methods, another idea is to make the epoxy base liquid have a certain hydrophilicity and the hydrophilic group is dissolved in the water film and directly passes through the water film to contact the surface of the object to be repaired. Meanwhile, the affinity between the adhesive and the adhered base material is improved, the affinity between the adhesive and the adhered base material is reduced, the underwater bonding performance of the adhesive can be improved, the affinity between the adhesive and the adhered base material can be improved by adding a functional auxiliary agent, and meanwhile, the affinity between the adhesive and water can be reduced by adopting a hydrophobic raw material.
Has the advantages that: compared with the prior art, the invention has the following remarkable characteristics:
1. the epoxy mortar prepared by 593 curing agent has good underwater bonding performance, the water absorption rate and the water dissolution rate of a cured product generated by the reaction with epoxy resin are relatively low, and the prepared epoxy mortar can generate good bonding strength underwater;
2. the diluent can improve the fluidity of the epoxy mortar and improve the spreading, infiltration and infiltration capacities of the bonding interface of the epoxy mortar, thereby improving the water discharge capacity of the bonding interface;
3. the addition of a proper amount of KH-550 coupling agent can improve the underwater bonding strength of the epoxy mortar.
Drawings
FIG. 1 is a process flow diagram of the present invention;
FIG. 2 is a graph showing the change of compressive strength and flexural strength of the epoxy mortar according to the invention under different filler contents;
FIG. 3 is a graph showing the change in underwater bonding strength of epoxy mortar according to the present invention with different filler amounts;
FIG. 4 is a graph showing the change of the mass loss of epoxy mortar with time according to the present invention at different filler loadings.
Detailed Description
In the following examples, epoxy value of epoxy resin is 0.48-0.54 mol/100g, P.O 42.5 grade cement and standard sand are selected as fillers, 593 curing agent (amine value is 500-600 MgKOH/g) is adopted to prepare epoxy mortar, epoxy value of diluent is 0.43eq/100g, density of coupling agent is 0.944-0.950 g/cm3。
Example 1
The preparation method of the epoxy mortar for underwater repair comprises the following steps:
(1) 288 parts of weighed sk-023N type standard sand and 72 parts of P.O 42.5.5 type ordinary portland cement are placed in a stirring barrel to be uniformly stirred;
(2) sequentially adding 98 parts of accurately weighed E-51 type epoxy resin, 8 parts of 692 diluent and 28 parts of epoxy resin main agent consisting of 2 parts of KH-550 coupling agent and 28 parts of 593 epoxy modified aliphatic amine curing agent into a stirring barrel;
(3) uniformly stirring by using an electric stirrer, and standing for 4min, wherein the rotating speed of the stirrer is 40r/min, and the power is 2 kW.
Example 2
The preparation method of the epoxy mortar for underwater repair comprises the following steps:
(1) 518 parts of weighed sk-023N type standard sand and 130 parts of P.O 42.5.5 type ordinary portland cement are placed in a stirring barrel to be uniformly stirred;
(2) adding 102 parts of E-51 type epoxy resin, 12 parts of 501 diluent and 6 parts of KH-560 coupling agent which are accurately weighed into a stirring barrel, and adding 32 parts of 531 epoxy modified aliphatic amine curing agents into the stirring barrel in sequence;
(3) uniformly stirring by using an electric stirrer, and standing for 8min, wherein the rotating speed of the stirrer is 50r/min, and the power is 3 kW.
Example 3
The preparation method of the epoxy mortar for underwater repair comprises the following steps:
(1) placing 403 parts of weighed sk-023N type standard sand and 101 parts of P.O 42.5.5 type ordinary portland cement in a stirring barrel to be uniformly stirred;
(2) adding 100 parts of E-51 type epoxy resin, 100 parts of 692 diluent and 30 parts of T-31 epoxy modified aliphatic amine curing agent which are accurately weighed and are composed of an epoxy resin main agent and 4 parts of KH-570 coupling agent into a stirring barrel in sequence;
(3) an electric stirrer is adopted for stirring evenly and standing for 6min, the rotating speed of the stirrer is 45r/min, and the power is 2.5 kW.
Example 4
The preparation method of the epoxy mortar for underwater repair comprises the following steps:
(1) placing 310 parts of weighed sk-023N type standard sand and 80 parts of P.O 42.5.5 type ordinary portland cement in a stirring barrel to be uniformly stirred;
(2) sequentially adding 99 parts of E-51 type epoxy resin, 9 parts of 501 diluent and 3 parts of KH-550 coupling agent which are accurately weighed into a stirring barrel, and 29 parts of T-33 epoxy modified aliphatic amine curing agent;
(3) uniformly stirring by using an electric stirrer, and standing for 5min, wherein the rotating speed of the stirrer is 42r/min, and the power is 2 kW.
Example 5
The preparation method of the epoxy mortar for underwater repair comprises the following steps:
(1) 450 parts of weighed sk-023N type standard sand and 120 parts of P.O 42.5.5 type ordinary portland cement are placed in a stirring barrel to be uniformly stirred;
(2) adding 101 parts of E-51 type epoxy resin, 11 parts of 501 diluent and 5 parts of KH-560 coupling agent which are accurately weighed into an epoxy resin main agent and 31 parts of JH-5553 epoxy modified fatty amine curing agent in a stirring barrel in sequence;
(3) uniformly stirring by using an electric stirrer, and standing for 7min, wherein the rotating speed of the stirrer is 48r/min, and the power is 3 kW.
Comparative Performance test
Four parallel experiments are set, the concrete formula is shown in table 1, and the influence of the filler amount on the mechanical property of the epoxy mortar is shown in table 2, except that the parts of the cement and the standard sand are different from those in example 3, and the rest are the same.
TABLE 1 proportioning table (parts)
TABLE 2 influence of Filler consumption on the mechanical Properties of epoxy mortars
In order to more intuitively express the relationship between the mechanical property of the epoxy mortar and the amount of the filler, according to the experimental data in table 2, the change line graphs of the compressive strength, the flexural strength and the underwater bonding strength of the epoxy mortar with different filler amounts are drawn, as shown in fig. 2-3. As can be seen from fig. 2 and 3:
(1) the compressive strength of the epoxy mortar is increased and then reduced along with the increase of the using amount of the filler, and when the part ratio of the filler to the epoxy base liquid in the epoxy mortar is 4.0, the compressive strength of the epoxy mortar reaches the maximum and is 90.3 MPa.
(2) The flexural strength of the epoxy mortar is increased and then reduced along with the increase of the using amount of the filler, and when the part ratio of the filler to the epoxy base liquid in the epoxy mortar is 3.5, the flexural strength of the epoxy mortar reaches the maximum and is 33.4 MPa. This is because, when the amount of filler is small, the filler gradually sinks to the bottom of the epoxy mortar during curing, which affects the flexural strength of the epoxy mortar.
(3) With the increase of the mass ratio of the filler to the epoxy base liquid, the underwater bonding strength of the epoxy mortar is not obviously changed at first, but when the mass ratio of the parts of the filler to the epoxy base liquid exceeds 3.5, the underwater bonding strength of the epoxy mortar is obviously reduced.
In conclusion, the ratio of the two groups of epoxy mortar fillers and the epoxy base liquid of the test numbers 3 and 4 is preferably 3.5: 1 and 4: 1 respectively.
The tensile strength is an important mechanical property of the epoxy mortar and is also an important index for representing the anti-cracking property of the epoxy mortar, the tensile strength is used as a judgment index for the anti-aging property of the epoxy mortar in the test, and the result is shown in table 3.
TABLE 3 anti-aging Performance test results for epoxy mortars
From table 3, it can be seen: after the epoxy mortar prepared by the mixture ratio of the test number 3 undergoes 240h ultraviolet accelerated aging test, the tensile strength is reduced to some extent, and the strength retention rate is 97.0 percent; the retention of tensile strength by the formulation of test No. 4 was 93.6%. Therefore, the epoxy mortar prepared by the mixture ratio of the test number 3 has better ultraviolet aging resistance.
In engineering, a water passing building is usually intermittently passed with water for a long time, and in order to research the change of the performance of the epoxy mortar in the process of resisting sand-containing water flow scouring, 3 periods of scouring tests are carried out on the epoxy mortar, wherein each period is 72 hours. The results of the impact and abrasion resistance tests of the epoxy mortar are shown in Table 4.
TABLE 4 abrasion resistance test results of epoxy mortars
In order to more intuitively compare the mass loss change of the two groups of epoxy mortar in the impact resistance and wear resistance test of each period, a line graph of the mass loss change of the two groups of epoxy mortar prepared according to the mixture ratio along with the change of time is drawn according to the test data in the table 4, and the line graph is shown in fig. 4.
As can be seen from fig. 4, the epoxy mortar has a large mass loss in the first scouring cycle, and the mass loss gradually decreases in the subsequent scouring process. Compared with the mixture ratio of the test number 4, the epoxy mortar prepared by the mixture ratio of the test number 3 has higher impact resistance and wear resistance.
In conclusion, the part ratio of the filler to the epoxy base liquid in the epoxy mortar is preferably 3.5: 1, and the epoxy mortar has good ageing resistance, abrasion resistance, underwater bonding performance and bonding stability, and is suitable for underwater repair.
Claims (8)
1. The epoxy mortar for underwater repair is characterized by comprising the following substances in parts by weight: 98-102 parts of epoxy resin, 28-32 parts of curing agent, 8-12 parts of diluent, 2-6 parts of coupling agent, 72-130 parts of cement and 288-518 parts of standard sand.
2. The epoxy mortar for underwater repair according to claim 1, wherein: the epoxy resin is E-51 type epoxy resin, and the epoxy value is 0.48-0.54 mol/100 g.
3. The epoxy mortar for underwater repair according to claim 1, wherein: the curing agent is any one of 593, 531, T-31, T-33 and JH-5553 epoxy modified fatty amine, and the amine value is 500-600 MgKOH/g.
4. The epoxy mortar for underwater repair according to claim 1, wherein: the diluent is 692 or 501 diluent and the epoxy value is 0.43eq/100 g.
5. According to claimThe epoxy mortar for underwater repair of claim 1, characterized in that: the coupling agent is any one of KH-550, KH-560 and KH-570, and the density is 0.944-0.950 g/cm3。
6. The epoxy mortar for underwater repair according to claim 1, wherein: the cement is P.O 42.5.5 type ordinary portland cement.
7. The epoxy mortar for underwater repair according to claim 1, wherein: the standard sand is sk-023N type standard sand.
8. A preparation method of epoxy mortar for underwater repair is characterized by comprising the following steps:
(a) placing the weighed sand and cement filler into a stirring barrel and uniformly stirring;
(b) sequentially adding the precisely weighed epoxy resin, diluent, coupling agent and curing agent into a stirring barrel;
(c) stirring evenly and standing for 4-8 min, wherein the stirring speed is 40-50 r/min, and the power is 2-3 kW.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910885358.XA CN110615639A (en) | 2019-09-18 | 2019-09-18 | Epoxy mortar for underwater repair and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910885358.XA CN110615639A (en) | 2019-09-18 | 2019-09-18 | Epoxy mortar for underwater repair and preparation method thereof |
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| CN110615639A true CN110615639A (en) | 2019-12-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112876177A (en) * | 2021-04-07 | 2021-06-01 | 西京学院 | Desert sand epoxy resin composite mortar and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0553741B2 (en) * | 1985-01-30 | 1993-08-10 | Nichireki Chem Ind Co | |
| CN102659369A (en) * | 2012-05-18 | 2012-09-12 | 山西省交通科学研究院 | Epoxy emulsion modified quick repair mortar for concrete roads and bridges and preparation method for mortar |
| CN106517959A (en) * | 2016-11-22 | 2017-03-22 | 江苏苏博特新材料股份有限公司 | Epoxy mortar adopting surface modified fibers for toughness enhancement |
| CN106882938A (en) * | 2017-04-18 | 2017-06-23 | 安徽省康宇水电机械成套设备有限公司 | A kind of hydraulic engineering underwater construction dedicated mortar |
-
2019
- 2019-09-18 CN CN201910885358.XA patent/CN110615639A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0553741B2 (en) * | 1985-01-30 | 1993-08-10 | Nichireki Chem Ind Co | |
| CN102659369A (en) * | 2012-05-18 | 2012-09-12 | 山西省交通科学研究院 | Epoxy emulsion modified quick repair mortar for concrete roads and bridges and preparation method for mortar |
| CN106517959A (en) * | 2016-11-22 | 2017-03-22 | 江苏苏博特新材料股份有限公司 | Epoxy mortar adopting surface modified fibers for toughness enhancement |
| CN106882938A (en) * | 2017-04-18 | 2017-06-23 | 安徽省康宇水电机械成套设备有限公司 | A kind of hydraulic engineering underwater construction dedicated mortar |
Non-Patent Citations (1)
| Title |
|---|
| 张立艳: "可水下固化环氧砂浆的制备与性能研究", 《新型建筑材料》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112876177A (en) * | 2021-04-07 | 2021-06-01 | 西京学院 | Desert sand epoxy resin composite mortar and preparation method thereof |
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