CN112375536B - Waterproof elastic sealing material - Google Patents
Waterproof elastic sealing material Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J181/00—Adhesives based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing sulfur, with or without nitrogen, oxygen, or carbon only; Adhesives based on polysulfones; Adhesives based on derivatives of such polymers
- C09J181/04—Polysulfides
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/04—Non-macromolecular additives inorganic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/08—Macromolecular additives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2262—Oxides; Hydroxides of metals of manganese
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
Abstract
The present application provides a waterproof elastic sealing material comprising: a liquid polysulfide rubber having a number average molecular weight of 1000 to 7500 and a degree of crosslinking of 0 to 2; the cross-linking agent is active manganese dioxide; the weight ratio of the liquid polysulfide rubber to the cross-linking agent is 6-14: 1; the liquid polysulfide rubber accounts for 25-60% of the total weight of the waterproof elastic sealing material, and the cross-linking agent accounts for 2-5% of the total weight of the waterproof elastic sealing material. The caulking waterproof sealing material has low density after being cured, and improves the economy; the water and gas transmission rate is low, and the waterproof effect is good; the activity retention rate is high after storage; under the working condition of long-term soaking, the mechanical property retention rate of the concrete adhesive is high; the method is suitable for improving the condition that the bonding strength of the existing caulking sealing elastic material is greatly attenuated under the working condition of long-term soaking, so that the project needs frequent maintenance, and the quality of waterproof projects including tunnels, bridges, roads, sewage treatment pools, channels and the like is improved.
Description
Technical Field
The invention relates to an elastic sealing material, in particular to a caulking waterproof elastic sealing material with high-efficiency water resistance.
Background
The caulking waterproof elastic sealing material is an important component unit of an engineering waterproof sealing system, and the quality of the caulking waterproof elastic sealing material directly influences the waterproof effect of engineering. The waterproof engineering joint structure relates to porous materials such as concrete and the like or various metal materials, and due to different design or building types and different working conditions of caulking positions, a waterproof elastic sealing material with high performance retention rate is selected for sealing waterproof bonding of the caulking positions, so that the expansion allowance of concrete after thermal expansion and cold contraction can be offset, the long-term bonding property of the caulking sealing material and a joint base material can be ensured, the air-tightness and water-tightness durability of the caulking positions can be improved, the repair frequency of building engineering can be reduced, and the national policy of energy conservation and consumption reduction can be actively responded.
With the development of scientific research, the caulking waterproof elastic sealing materials have various types, such as organic silicon, polysulfide, modified polysulfide, polyurethane, modified polyurethane and the like, and the characteristics of the materials are different. The waterproof building engineering has different requirements on the material selection of the caulking materials due to different geographical positions, building structure designs and the like. According to the knowledge, in the existing waterproof building engineering, the joint part is made of porous materials such as concrete and the like, and under the water condition, the water cannot be prevented from permeating to the bonding surface of the caulking sealing material, so that the bonding performance of the caulking sealing waterproof material and a base material is poor under the long-term soaking condition, and the problem that the caulking sealing waterproof part needs to be frequently maintained needs to be solved. Overall, the choice of caulking waterproof sealing material mainly takes two aspects into account: firstly, the body of the caulking elastic sealing material is waterproof; second, the retention of the tensile bond strength of the caulking elastic sealing material under a long-term water immersion environment.
Disclosure of Invention
The invention mainly aims to provide a caulking waterproof elastic sealing material which can effectively improve the long-term waterproof function of waterproof engineering.
The present application provides a waterproof elastic sealing material comprising:
a liquid polysulfide rubber having a number average molecular weight of 1000 to 7500 and a degree of crosslinking of 0 to 2;
a crosslinking agent;
wherein the cross-linking agent is active manganese dioxide; the weight ratio of the liquid polysulfide rubber to the cross-linking agent is 6-14: 1;
the liquid polysulfide rubber accounts for 25-60% of the total weight of the waterproof elastic sealing material, and the cross-linking agent accounts for 2-5% of the total weight of the waterproof elastic sealing material.
In one embodiment, the waterproof elastic sealing material of the present application further comprises one or more additives selected from the group consisting of environmentally friendly plasticizers, fillers, coupling agents, defoamers, colorants and accelerators.
In one embodiment, the waterproof elastomeric sealing composition includes an A-side component and a B-side component,
wherein the component A comprises the following components in percentage by weight based on the total weight of the component A:
the component B comprises the following components in percentage by weight based on the total weight of the component B:
in one embodiment, the mass ratio of the a component to the B component is 100: 6 to 14.
In one embodiment, the coupling agent includes both titanate-based coupling agents and silane-based coupling agents; preferably, the weight ratio of the titanate coupling agent to the silane coupling agent is 1-3: 1.
in one embodiment, the first filler is selected from one or more of calcium carbonate, fumed silica, nanocalcium carbonate, kaolin;
the second filler is selected from cenosphere hollow filler, and preferably, the second filler is cenosphere hollow filler with the particle size of 40 mu m.
In one embodiment, the defoamer is one or more of a polyether, polyether modified silicone sealant defoamer.
In one embodiment, the environmentally friendly plasticizer is one or more of benzoate, polyether alcohol; the colorant is one or more of carbon black and titanium dioxide; the accelerator is one or more of diphenyl guanidine and zinc dithiocarbamate.
The caulking waterproof elastic sealing material belongs to polysulfide sealing materials, can be prepared in a A, B double-component mode, and the coupling agent in the A component system adopts a compounding mode of titanate coupling agent and silane coupling agent, so that the hydrophobicity and the dispersibility of the filler are improved on the basis of ensuring the bonding performance with the base material; the hollow microsphere filler which is light, high in strength, acid and alkali resistant, extremely low in absorption rate and good in fluidity is introduced, so that the density is reduced, the economy is improved, and the waterproofness is improved; active manganese dioxide is adopted as a cross-linking agent in the component B, so that the cross-linking activity of a system is ensured, and the storage stability is improved. Therefore, the waterproof capacity of the caulking waterproof elastic sealing material is improved, and the bonding strength retention rate of the caulking waterproof elastic sealing material under the long-term water immersion working condition is improved; moreover, the caulking waterproof elastic sealing material is low in water-air permeability after being cured, good in waterproof effect and suitable for improving the condition that the construction needs frequent maintenance due to large bonding strength attenuation under the long-term water immersion working condition of the existing caulking waterproof elastic sealing material so as to improve the quality of waterproof construction. The waterproof engineering comprises tunnels, bridges, roads, sewage treatment pools, channels and the like.
Drawings
FIG. 1 is a graph showing the pot life rate of change of different caulk materials of examples 1-5 and comparative examples 1-3 stored at 50 ℃ for different periods;
FIG. 2 is a graph showing the tensile strength of different caulk materials of examples 1-5 and comparative examples 1-3 as a function of immersion time;
FIG. 3 is a graph showing the change rate of tensile strength with immersion time for different caulking materials of examples 1 to 5 and comparative examples 1 to 3.
Detailed Description
The technical solution of the present invention is further explained below according to specific embodiments. The scope of protection of the invention is not limited to the following examples, which are set forth for illustrative purposes only and are not intended to limit the invention in any way.
The present application provides a waterproof elastic sealing material comprising:
a liquid polysulfide rubber having a number average molecular weight of 1000 to 7500 and a degree of crosslinking of 0 to 2;
a crosslinking agent;
wherein the cross-linking agent is active manganese dioxide with a pH value; the weight ratio of the liquid polysulfide rubber to the cross-linking agent is (6-14): 1;
the liquid polysulfide rubber accounts for 25-60% of the total weight of the waterproof elastic sealing material, and the cross-linking agent accounts for 2-5% of the total weight of the waterproof elastic sealing material.
The main material in the waterproof elastic sealing material is liquid polysulfide rubber. In one embodiment, the liquid polysulfide rubber has a number average molecular weight of 1000 to 7500 and a crosslinking degree of 0 to 2. The liquid polysulfide rubber has the following advantages: the liquid polysulfide rubber can be used for preparing polysulfide waterproof sealant with moderate elasticity, tensile bonding strength with concrete and wide deflection adjustable range.
In one embodiment, the liquid polysulfide rubber may be one or more of liquid polysulfide rubbers with a number average molecular weight of 1000 to 7500 and a crosslinking degree of 0 to 2, preferably 2:
the liquid diethoxy-methane polysulfide polymer with the number average molecular weight of 1000 and the degree of crosslinking of 2 is marked as liquid polysulfide rubber # 1. The liquid polysulfide rubber 1# may be purchased from one or more of the chemical research institute of francisco, eastern japan ltd, or aksunobel, germany.
Liquid diethoxy-methane polysulfide polymer with a number average molecular weight of 7500 and a degree of crosslinking of 0.5 is designated as liquid polysulfide rubber # 2. The liquid polysulfide rubber 2# may be purchased from one or more of the chemical research institute of francisco, eastern japan ltd, or aksunobel, germany.
According to another embodiment of the present invention, the selection and the proportion of the liquid polysulfide rubbers 1# and 2# in the caulking waterproof elastic sealing material can be properly adjusted according to different requirements of specific engineering on the performance of the caulking waterproof elastic sealing material. The use of two liquid polysulfide rubbers has the following advantages: through compounding of the high-molecular-weight and low-molecular-weight liquid polysulfide rubbers, the bonding strength of the caulking waterproof elastic sealing material is improved, the elasticity and the deflection capability of the caulking waterproof elastic sealing material are optimized, the viscosity of the component A system is optimized, and the workability is improved.
In one embodiment, the crosslinking agent is activated manganese dioxide. The cross-linking agent of the liquid polysulfide rubber generally adopts metal peroxide or variable valence metal oxide, such as manganese dioxide, lead dioxide, calcium peroxide and the like; wherein, lead dioxide is easy to cause heavy metal poisoning and can not meet the safety requirement of drinking water; calcium peroxide and combustible materials are mixed to cause explosiveness and easy burning. The commercial manganese dioxide products show different oxidation capacities, i.e., different activities, in the system due to different contents. It is not uncommon in the industry to refer to manganese dioxide as active manganese dioxide with a manganese dioxide content above 80% and as inactive manganese dioxide below 80%. The determination of the manganese dioxide content is carried out by an iodometry method: that is, manganese dioxide can quantitatively oxidize iodide ions into iodine in a hydrochloric acid medium, and the content of manganese dioxide is determined by titrating iodine with a sodium thiosulfate standard solution by using starch as an indicator. The active manganese dioxide (black powder in appearance) can be prepared by using natural manganese dioxide as a raw material through processes of reduction, disproportionation, weight conversion and the like, has the characteristics of a gamma-type crystal structure and the like, and is different from inactive manganese dioxide in structure. Commercially available products of this active manganese dioxide can also be used. The use of this cross-linking agent according to the invention has the following advantages: the problem of heavy metal pollution caused by adopting lead dioxide is avoided, and the safety requirement of drinking water is met; the safety problem caused by adopting calcium peroxide is avoided; meanwhile, the storage stability of the component B is improved and the elasticity of the material after curing is improved by adopting active manganese dioxide; the material is free of air holes after being cured, and the sealing and waterproof effects are good.
In one embodiment, the weight ratio of the liquid polysulfide rubber to the crosslinking agent is (6-14): 1. in one embodiment, the liquid polysulfide rubber comprises (25 to 60) wt.% and the crosslinking agent comprises (2 to 5)%, based on the total weight of the waterproof elastomeric sealing composition, in the waterproof elastomeric sealing composition. By adopting the proportion, the following advantages are achieved: the material can be completely crosslinked within a specified time, and the situation that the material is continuously crosslinked and hardened and has poor stability and durability due to continuous crosslinking and hardening along with the prolonging of the service time is avoided.
In one embodiment, the waterproof elastic sealing material further comprises one or more additives selected from the group consisting of environmentally friendly plasticizers, fillers, coupling agents, defoamers, colorants and accelerators.
In one embodiment, the waterproof elastomeric sealing composition may be dispensed as an A, B two-component composition for ease of shipping and storage of the waterproof elastomeric sealing composition, provided that the liquid polysulfide rubber and the crosslinking agent are contained in separate components. For example, if the a-component comprises a liquid polysulfide rubber, the crosslinking agent is contained in the B-component. And vice versa.
In one embodiment, the waterproof elastomeric sealing composition includes an A-side component and a B-side component,
wherein the component A comprises the following components in percentage by weight based on the total weight of the component A:
the component B comprises the following components in percentage by weight based on the total weight of the component B:
in the above embodiment, the mass ratio of the a component to the B component is 100: (6-14).
In one embodiment, the coupling agent comprises a combination of a titanate coupling agent and a silane coupling agent, and preferably, the weight ratio of the titanate coupling agent to the silane coupling agent is (1-3): 1. the combination of titanate coupling agent and silane coupling agent can achieve the following effects: on the basis of ensuring the bonding performance with the base material, the hydrophobicity and the dispersibility of the filler are improved, so that the waterproof capacity of a material system is improved, and the bonding strength retention rate of the caulking waterproof elastic sealing material under the long-term soaking working condition is improved.
The silane coupling agent may be, for example, one or more of v-mercaptopropyltriethoxysilane, N- β - (aminoethyl) - γ -aminopropylmethyldimethoxysilane, and γ -glycidyloxypropyltrimethoxysilane.
The titanate coupling agent may be, for example, one or more of monoalkoxy titanate coupling agent and isopropyl tris (dioctylphosphonoxy) titanate.
In one embodiment, the first filler is selected from one or more of calcium carbonate, fumed silica, nanocalcium carbonate, kaolin; the second filler is selected from cenosphere hollow filler, and preferably, the second filler is cenosphere hollow filler with the particle size of 40 mu m. The use of a combination of two fillers, in particular a cenosphere filler with other fillers, makes it possible to achieve the following effects: after the hollow microsphere filler is introduced, the density is reduced, the thixotropy of the material is improved, the engineering maintenance cost is reduced, and the process performance is improved on the premise of ensuring the waterproof effect. The cenosphere filler may include cenospheres, hollow glass fibers, and the like.
In one embodiment, the defoamer is one or more of a polyether, polyether modified silicone sealant defoamer. In one embodiment, the environmentally friendly plasticizer is one or more of benzoate, polyether alcohol; the colorant is one or more of carbon black and titanium dioxide; the accelerator is one or more of diphenyl guanidine and zinc dithiocarbamate.
The caulking waterproof elastic sealing material disclosed by the invention is low in water vapor transmission rate after being cured, and the self durability of the material is superior to that of other materials used in hydraulic engineering, such as modified polysulfide and polyurethane, and the caulking waterproof elastic sealing material can be effectively improved in the durability of waterproof sealing of a caulking part when being applied to waterproof engineering; the solid content is 100%, the water-drinking water does not contain heavy metal, solvent and low-boiling point plasticizer, has no pollution to porous base materials such as water bodies, concrete and the like and metal base materials, and is environment-friendly and applicable to water drinking engineering. The waterproof elastic sealing material is suitable for various waterproof projects, including tunnels, bridges, roads, sewage treatment pools, channels and the like.
Example (b): the component A of the caulking waterproof elastic sealing material of the invention is mainly explained by preferred 5 examples.
The following two liquid polysulfide rubbers are used in the following examples:
liquid diethoxy-methane polysulfide polymer having a number average molecular weight of 1000 and a degree of crosslinking of 2, designated as liquid polysulfide rubber # 1, was purchased from east-li japan.
② a liquid diethoxy-methane polysulfide polymer having a number average molecular weight of 7500 and a degree of crosslinking of 0.5, which is designated as liquid polysulfide rubber # 2 and is available from Toray corporation of Japan.
In the following examples, the crosslinking agent used was activated manganese dioxide; the hollow filler used is hollow microspheres (hereinafter referred to as "hollow microspheres"); the titanate coupling agent is mono-alkoxy titanate coupling agent; the silane coupling agent used is v-mercaptopropyltriethoxysilane.
Example 1:
the component A of the waterproof elastic sealing material used in the embodiment comprises the following components in parts by weight:
component A
The component B of the waterproof elastic sealing material used in the embodiment comprises the following components in parts by weight:
b component
When in use, A, B components are mixed according to the weight ratio of 100: 10, and curing to obtain the waterproof elastic sealing material.
Example 2:
the component A of the waterproof elastic sealing material used in the embodiment comprises the following components in parts by weight:
component A
The component B of the waterproof elastic sealing material used in the embodiment comprises the following components in parts by weight:
b component
When in use, A, B components are mixed according to the weight ratio of 100: 6, curing to obtain the waterproof elastic sealing material.
Example 3:
the component A of the waterproof elastic sealing material used in the embodiment comprises the following components in parts by weight:
component A
The component B of the waterproof elastic sealing material used in the embodiment comprises the following components in parts by weight:
b component
When in use, A, B components are mixed according to the weight ratio of 100: 6, curing to obtain the waterproof elastic sealing material.
Example 4:
the component a used in the waterproof elastic sealing material of this example 4 includes the following composition and compounding ratio:
component A
The component B of the waterproof elastic sealing material used in the embodiment comprises the following components in parts by weight:
b component
When in use, A, B components are mixed according to the weight ratio of 100: 14, and curing to obtain the waterproof elastic sealing material.
Example 5:
the component a used in the waterproof elastic sealing material of this example 5 included the following composition and compounding ratio:
component A
The component B of the waterproof elastic sealing material used in the embodiment comprises the following components in parts by weight:
b component
When in use, A, B components are mixed according to the weight ratio of 100: 14, and curing to obtain the waterproof elastic sealing material.
Comparative example 1:
the component A of the waterproof elastic sealing material used in the embodiment comprises the following components in parts by weight:
component A
The component B of the waterproof elastic sealing material used in the embodiment comprises the following components in parts by weight:
b component
When in use, A, B components are mixed according to the weight ratio of 100: 10, and curing to obtain the waterproof elastic sealing material.
Comparative example 2:
the component A used in the waterproof elastic sealing material of comparative example 2 comprises the following components and proportions:
component A
The component B of the waterproof elastic sealing material used in the embodiment comprises the following components in parts by weight:
b component
When in use, A, B components are mixed according to the weight ratio of 100: 10, and curing to obtain the waterproof elastic sealing material.
Comparative example 3:
the component A of the waterproof elastic sealing material used in the embodiment comprises the following components in parts by weight:
component A
The component B of the waterproof elastic sealing material used in the embodiment comprises the following components in parts by weight:
b component
When in use, A, B components are mixed according to the weight ratio of 100: 16, and curing to obtain the waterproof elastic sealing material.
Test example:
the waterproof engineering needs to evaluate the applicability of the material by considering the body waterproofness of the material and the tensile bonding strength attenuation rate of the material and the concrete under the long-term water immersion working condition, and meanwhile, the constructability of the material can be considered for construction convenience. To illustrate the performance characteristics of the caulk waterproof elastomeric seal material described in the present invention, the above examples and comparative examples were subjected to the following performance tests:
testing the sag of the mixture at 50 ℃;
the working life of different storage periods;
thirdly, testing the density of the material after curing;
testing the water vapor transmission rate after curing;
and fifthly, directly taking out the prepared I-shaped concrete sample after soaking the I-shaped concrete sample in water for different periods to test the attenuation rate of the tensile bonding strength.
The sag refers to that the bi-component sealing material is evenly mixed according to the product use specification under the specified condition, then is injected into a specified sag mould, is kept for a certain time in a vertical state at a certain temperature, and then the length of the sealing material flowing out of the mould is measured, so as to evaluate the fluidity of the sealing material; the sagging is carried out according to method A of GB/T13477.6: the prepared test piece was immediately placed vertically in a drying oven adjusted to (50 ± 2) ° c, with the extended end of the mold down, for 24 hours. Then, the sealing member was taken out and the distance of the downward movement of the sealing member was measured in the vertical direction with a measuring scale.
TABLE 1 sag data Table at 50 ℃ for different jointing materials
The working life refers to the period from the beginning of mixing to the time which is not suitable for construction of the bi-component sealing material; the pot life test was carried out according to method A or B of GB/T13477.3 by placing the above examples and comparative examples in accelerated storage in an air-blast drying oven at 50 degrees Celsius to check the storage stability of each material, and the test data are shown in tables 1 and 2 below:
TABLE 2 data Table of pot life of materials for different storage periods
TABLE 3 data table of pot life change rates for different caulk materials for different storage periods
The density is measured according to GB/T533 determination of vulcanized rubber density: the above examples and comparative examples were prepared into a 2mm thick dense adhesive film, maintained for 24 hours, and tested using a ML204 model analytical balance produced by mettler instruments and factories with a precision of 0.1mg, with the results as shown in table 3 below:
TABLE 4 Density data sheet for different caulks after curing
The water vapor permeability is measured according to GB/T1037 cup method which is an experimental method for water vapor permeability of plastic films and sheets. Water vapor transmission amount: under the conditions of specified temperature, relative humidity, certain water vapor difference and certain thickness, 1m2The amount of water vapor that the sample of (2) has permeated within 24 hours. Under the condition of consistent temperature, humidity and material size, the water vapor transmission amount of the material is only related to the material body structure.
Water vapor transmission test method: the sealing materials prepared in the 5 examples and the sealing materials prepared in the 3 comparative examples are uniformly mixed according to the respective use proportion, then pressed into films with the thickness of 2mm +/-0.2 mm, and cured according to requirements. After curing, the test was performed by using a water vapor transmission rate test system of model W3/060 manufactured by the commercial electrooptic electromechanical technology ltd, and the results are shown in table 4 below:
TABLE 5 data table of water vapor transmission after curing of different caulking materials
The preparation and test of the I-shaped sample are carried out according to GB/T13477.8 part 8 of test method of building sealing materials: determination of tensile adhesion, GB/T13477.9 test methods for building sealants part 9: measurement of tensile adhesiveness after immersion in water "test conditions were set as follows:
a. curing for 14d under standard conditions;
b. after standard condition maintenance for 14d, soaking for 4d under standard conditions;
c. after standard condition maintenance for 14 days, soaking for 8 days under standard conditions;
d. after standard condition maintenance for 14d, soaking for 16d under standard conditions;
e. after standard condition maintenance for 14d, soaking for 30d under standard conditions;
wherein, the soaking test is a test within 10min after being taken out.
The test results are given in table 5 below:
TABLE 6 tensile Strength data sheet after different caulking materials are soaked in water for different periods
FIG. 1 shows a graph comparing the pot life change rates of different storage periods for different materials of examples 1 to 5 and comparative examples 1 to 3, FIG. 2 shows a graph comparing the tensile strengths at different immersion times for different materials of examples 1 to 5 and comparative examples 1 to 3, and FIG. 3 shows a graph comparing the tensile strength change rates at different immersion times for different materials of examples 1 to 5 and comparative examples 1 to 3.
The test data for the above examples and comparative examples show that:
the hollow microspheres with larger particle sizes (80 microns) are adopted in the embodiment 3, so that the system has larger fluidity, the sag is larger than that of the embodiment 2 with the same formula proportion, and the construction performance is slightly poor when the vertical face construction is involved; comparative example 1, which uses non-active manganese dioxide as a cross-linking agent, resulted in a slow system activity, a long reaction time, a long time affected by the material's own weight, and a large sagging.
Comparative example 1 adopts inactive manganese dioxide outside the scope of the invention as a cross-linking agent, component A of comparative example 2 has lower content of liquid polysulfide rubber, and comparative example 3 has higher proportion of the cross-linking agent, which leads to that the storage stability of the component A is inferior to that of examples 1-5 in the aspect of change of the pot life after accelerated storage at 50 ℃.
Thirdly, in the examples 1-5 and the comparative example 1, due to the introduction of the hollow microspheres, the density of the cured product is smaller than that of the product in the comparative example 2-3, so that the economy is improved;
fourthly, compared with the prior art 1, when the inactive manganese dioxide is taken as the cross-linking agent, the effective cross-linking amount is low; in the comparative example 2, the effective crosslinking proportion is small because the content of the liquid polysulfide rubber in the component A is low; comparative example 3 because the content of the cross-linking agent exceeds the reaction range, and the uncured paste B component exists in the system, the water vapor transmission data of examples 1-5 are all superior to those of comparative examples 1-3; namely, the sealing and waterproof performance of the material bodies of the embodiments 1 to 5 is superior to that of the comparative examples 1 to 3;
in the embodiments 1-5, liquid polysulfide rubber and active manganese dioxide with appropriate content are used as cross-linking agents, titanate coupling agents capable of improving filler hydrophobicity and silane coupling agents are compounded to be used as tackifiers, and after the light, high-strength and acid-base-resistant hollow microspheres are introduced, the tensile bonding strength retention rate of the hollow microspheres and concrete under the water immersion working condition is obviously superior to that of the comparative examples 1-3; in examples 3 and 5, when the liquid polysulfide rubber is the same as the total weight of the waterproof elastic sealing material, the cross-linking agent is the same as the total weight of the waterproof elastic sealing material, and the usage ratio of the liquid polysulfide rubber to the cross-linking agent is the same, the tensile bonding strength retention ratio of example 3 is excellent; meanwhile, in example 1, although the liquid polysulfide rubber is less in content than in example 5, the retention rate of the tensile bond strength after the same period of immersion in water in example 1 is still better than that in example 5. It can be seen that in the embodiments 1 to 5, the titanate coupling agent and the silane coupling agent are added in a compounding manner, so that the water resistance retention rate is better, and the optimized weight ratio of the titanate coupling agent to the silane coupling agent is 1 to 3: 1; the retention rate of the tensile bonding strength after water immersion of the liquid polysulfide rubber, the cross-linking agent and the examples 1-5 with the use ratio within the range of the invention is better than that of the comparative examples without the range of the invention, and the water conservancy project constructed by the examples 1-3 has better durability than that of the projects constructed by the comparative examples 1-3 under the same suitable working condition.
Unless otherwise defined, all terms used herein have the meanings commonly understood by those skilled in the art.
It should be noted by those skilled in the art that the described embodiments of the present invention are merely exemplary and that various other substitutions, alterations, and modifications may be made within the scope of the present invention. Accordingly, the present invention is not limited to the above-described embodiments, but is only limited by the claims.
Claims (7)
1. A waterproof elastic sealing material comprising:
a liquid polysulfide rubber having a number average molecular weight of 1000 to 7500 and a degree of crosslinking of 0 to 2;
a crosslinking agent;
wherein the cross-linking agent is active manganese dioxide; the weight ratio of the liquid polysulfide rubber to the cross-linking agent is 6-14: 1;
the liquid polysulfide rubber accounts for 25-60% of the total weight of the waterproof elastic sealing material, and the cross-linking agent accounts for 2-5% of the total weight of the waterproof elastic sealing material;
wherein the waterproof elastic sealing material comprises a component A and a component B,
wherein the component A comprises the following components in percentage by weight based on the total weight of the component A:
the component B comprises the following components in percentage by weight based on the total weight of the component B:
the second filler is hollow microspheres with the particle size of 40 mu m.
2. The waterproof elastic sealing material according to claim 1, wherein the mass ratio of the A component to the B component is 100: 6 to 14.
3. The waterproof elastic sealing material according to claim 1 or 2, wherein the coupling agent includes both titanate-based coupling agents and silane-based coupling agents.
4. The waterproof elastic sealing material according to claim 3, wherein the weight ratio of the titanate-based coupling agent to the silane-based coupling agent is 1 to 3: 1.
5. the waterproof elastic sealing material according to claim 1 or 2, wherein the first filler is selected from one or more of calcium carbonate, fumed silica, kaolin.
6. The waterproof elastic sealing material according to claim 1 or 2, wherein the defoamer is one or more of polyether, polyether modified silicone based sealant defoamer.
7. The waterproof elastic sealing material according to claim 1 or 2, wherein the environmentally friendly plasticizer is one or more of benzoate, polyether alcohol; the colorant is one or more of carbon black and titanium dioxide; the accelerator is one or more of diphenyl guanidine and zinc dithiocarbamate.
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