CN115232554A - Corrosion-resistant elastic bonding protection composition and protection material - Google Patents
Corrosion-resistant elastic bonding protection composition and protection 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
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D181/00—Coating compositions 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; Coating compositions based on polysulfones; Coating compositions based on derivatives of such polymers
- C09D181/04—Polysulfides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
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- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/04—Thixotropic paints
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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
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
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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
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/32—Radiation-absorbing paints
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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
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2202/00—Metallic substrate
- B05D2202/10—Metallic substrate based on Fe
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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
Abstract
An etch-inhibiting elastomeric bond protecting composition and a protective material, the composition comprising: liquid polysulfide rubber with number average molecular weight of 2500-7500 and crosslinking degree of 0-2; a crosslinking agent; a corrosion inhibitor; activated wollastonite powder; an anti-aging agent. The anti-fatigue corrosion-resistant elastic bonding protective material obtained from the composition has good thixotropy, chemical inertia, heat resistance, ultraviolet irradiation resistance and fatigue resistance, and can effectively prevent electrochemical corrosion; in addition, the corrosion-resistant elastic bonding protective material has excellent sealing property and corrosion resistance, and can effectively isolate corrosion sources such as water vapor, acid, alkali, salt and the like in the environment; the long-acting corrosion-resistant protection device has the advantages that the device can be bonded firmly with the metal steel structure in a lasting way under the aging working condition related to bridge engineering, and long-acting corrosion-resistant protection on the metal steel structure is realized, wherein the metal steel structure comprises a bridge main cable, a welding line and the like.
Description
Technical Field
The invention relates to a corrosion-resistant elastic bonding protection composition, which is suitable for protecting a bridge steel structure, in particular to a corrosion-resistant elastic bonding protection composition and a protection material at a welding seam part.
Background
Along with economy big development, bridge construction has obtained the rapid development, and to the bridge steel construction, steel construction surface protection quality plays crucial effect to bridge life. The main causes of corrosion of the bridge steel structure are stress corrosion, hydrogen embrittlement, corrosion fatigue, and the like. At present, in order to prevent or reduce stress corrosion, a stress corrosion resistant metal material can be selected during construction, but the cost is extremely high, and large-scale industrial use cannot be realized; the tensile stress in the part can be reduced or eliminated through reasonable structural design during design; when the surface protective material is selected, an elastic adhesive material having excellent durability can be selected. Meanwhile, in order to prevent or reduce hydrogen embrittlement, stress and corrosion fatigue, an anti-fatigue elastic bonding material with excellent sealing property can be selected for external protection.
The traditional steel structure bridge protection mode mainly adopts surface spraying anticorrosive coating to realize corrosion prevention, and the mode has the following drawbacks: firstly, a welding seam belongs to the connection of two structures and can generate micro deformation under stress, and a hard coating is formed after a traditional anticorrosive coating is formed into a film, so that the traditional anticorrosive coating is easy to crack and fall off under stress, cannot play a long-acting sealing protection role, and has high maintenance cost; secondly, for special parts such as the surface of a welding seam of a bridge site of a steel structure bridge, the defects such as irregularity, pits and the like are easily generated at the welding seam due to the limitation of construction conditions, and accelerated corrosion is caused by stress, hydrogen embrittlement and the like if the surface protection quality is poor. Meanwhile, the surface state of the steel structure at the welding seam is changed after high-temperature welding, so that the bonding effect of the steel structure sprayed with the traditional anticorrosive paint can be influenced; the traditional sprayed anticorrosive coating is thin and generally not more than 100 mu m, and the effective protection of a welding seam part is difficult to realize; the traditional anticorrosive paint generally contains volatile solvent substances which are harmful to the environment and human bodies. In summary, the traditional anticorrosive coating is applied to the protection of modern bridge steel structures, has a plurality of defects, and can influence the safety and the aesthetic property of bridges.
Therefore, the development of an anti-fatigue corrosion-resistant elastic adhesive protection composition is a major concern in the field of bridge protection.
Disclosure of Invention
Aiming at the problems, the invention provides a corrosion-resistant elastic bonding protection composition and a protection material which are suitable for modern steel structure bridges, particularly for welding seam parts and have long-acting fatigue resistance.
In one aspect, the present application provides an etch-stop elastomeric adhesive protective composition comprising:
the liquid polysulfide rubber has a number-average molecular weight of 2500-7500 and a crosslinking degree of 0-2;
a crosslinking agent;
a corrosion inhibitor;
activated wollastonite powder;
an anti-aging agent;
wherein the weight ratio of the liquid polysulfide rubber to the cross-linking agent is 12.1-23.9: 1;
the liquid polysulfide rubber accounts for 26.8 to 61.0 percent of the total weight of the corrosion-resistant elastic bonding protection composition,
the cross-linking agent accounts for 1.4-4.8% of the total weight of the waterproof elastic sealing material,
the active wollastonite powder accounts for 7.1 to 18.9 percent of the total weight of the corrosion-resistant elastic bonding protective composition,
the corrosion inhibitor accounts for 1.8 to 9.9 percent of the total weight of the corrosion-resistant elastic bonding protection composition;
the anti-aging agent accounts for 0.9-2.9% of the total weight of the corrosion-resistant elastic bonding protection composition.
In one embodiment, the crosslinking agent is activated manganese dioxide.
In one embodiment, the corrosion inhibitor accounts for 1.8 to 9.9 percent of the total weight of the corrosion-inhibiting elastic bonding protection composition; preferably, the corrosion inhibitor is selected from one or more of phytic acid, benzotriazole (BTZ) and zinc phosphate; more preferably, the corrosion inhibitor is selected from the group consisting of phytic acid in combination with benzotriazole; preferably, the mass ratio of the combination of the phytic acid and the benzotriazole is (0.5-3): 1.
In one embodiment, the activated wollastonite powder is stearic acid-treated wollastonite powder having a particle size of 1500 mesh to 2500 mesh.
In one embodiment, the antioxidant is a substituted phenolic antioxidant, such as one or more of antioxidant SP, antioxidant 264, antioxidant 1010, and the like.
In one embodiment, the composition further comprises one or more additives selected from the group consisting of plasticizers, reinforcing fillers, coupling agents, thixotropic agents, and anti-aging agents.
In one embodiment, it comprises an A component and a B 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 parts by weight:
in one embodiment, the mass ratio of the A component to the B component is 100.
In one embodiment, the plasticizer is selected from one or more of dioctyl terephthalate, polyol benzoate;
the reinforcing filler is selected from one or more of active calcium carbonate, nano calcium carbonate, diatomite, lithopone, titanium dioxide and carbon black;
the coupling agent is selected from one or more of sulfur-containing silane coupling agent or epoxy silane coupling agent;
the thixotropic agent is selected from one or more of fumed silica, calcium stearate, bentonite and nano calcium carbonate;
the anti-aging agent is selected from amine anti-aging agent, phenol anti-aging agent and combination thereof.
The present application also provides an etch-resistant elastomeric bonding protective material formed from the etch-resistant elastomeric bonding protective composition of the present application. In one embodiment, the corrosion-resistant elastic bonding protection material is applied to steel structure protection.
The corrosion-resistant elastic bonding protective material belongs to polysulfide sealing materials, and can be prepared in a mode of containing A and B components, wherein in the A component system: the corrosion resistance, heat resistance and ultraviolet aging resistance of the system are improved by adopting a synergistic mode of the activated wollastonite powder and the composite corrosion inhibitor; meanwhile, when the phytic acid and the benzotriazole are compounded to be used as a corrosion inhibitor, the stability of ultraviolet irradiation resistance of the material is improved on the basis of ensuring good corrosion inhibition protection on the surface of a steel structure; in the component B system: firstly, active manganese dioxide is used as a cross-linking agent, so that the performance stability and fatigue resistance of the material are ensured; after the thixotropic agent is added, the thixotropy of a system is improved, and the thixotropic agent does not sag during construction; the A and B components are designed and prepared according to the ratio range of the liquid polysulfide rubber and the cross-linking agent, and then are mixed for use, so that the fatigue resistance and the corrosion resistance are improved, and the long-acting corrosion resistance and protection capability of the liquid polysulfide rubber are ensured. In summary, the anti-fatigue corrosion-resistant elastic bonding protective material has good thixotropy, chemical inertia, heat resistance, ultraviolet irradiation resistance and fatigue resistance, and can effectively prevent electrochemical corrosion; in addition, the corrosion-resistant elastic bonding protective material has excellent sealing property and corrosion resistance, and can effectively isolate corrosion sources such as water vapor, acid, alkali, salt and the like in the environment; the long-acting corrosion-resistant protection device has the advantages that the device can be bonded firmly with the metal steel structure in a lasting way under the aging working condition related to bridge engineering, and long-acting corrosion-resistant protection on the metal steel structure is realized, wherein the metal steel structure comprises a bridge main cable, a welding line and the like.
Detailed Description
The present application will be described in further detail below with reference to examples. The features and advantages of the present application will become more apparent from the description.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
In addition, the technical features described below in the different embodiments of the present application may be combined with each other as long as they do not conflict with each other.
The present application relates to an etch-stop elastomeric bonding protective composition comprising:
the liquid polysulfide rubber has a number-average molecular weight of 2500-7500 and a crosslinking degree of 0-2;
a crosslinking agent;
a corrosion inhibitor;
activated wollastonite powder;
an anti-aging agent.
The main material in the corrosion-resistant elastic bonding protective material is liquid polysulfide rubber. In one embodiment, the liquid polysulfide rubber used has a number average molecular weight of 2500 to 7500 and a degree of crosslinking of 0 to 2, and the use of such a liquid polysulfide rubber has the following advantages: the polysulfide corrosion-resistant elastic bonding protective material with high bonding strength with a metal steel structure, fatigue resistance and adjustable thixotropy can be prepared by adopting the liquid polysulfide rubber. The metal steel structure comprises a bridge main cable, a welding seam and the like.
In one embodiment, the liquid polysulfide rubber may be one or more of liquid polysulfide rubbers having a number average molecular weight of 2500 to 7500 and a degree of crosslinking of 0 to 2.
In one embodiment, the liquid polysulfide rubber may be a liquid diethoxy-methane polysulfide polymer having a number average molecular weight of 4000 and a degree of crosslinking of 0.5. The liquid polysulfide rubber may be purchased from one or more of eastern Japan, acrossobel, germany, and Korea, chemical research institute, inc. In one embodiment, the liquid polysulfide rubber may be a liquid diethoxy-methane polysulfide polymer having a number average molecular weight of 7500 and a degree of crosslinking of 0.5. The liquid polysulfide rubber may be purchased from one or more of the chemical research institute of francisco, eastern li japan, or aksunobel, germany. Of course, combinations of these commercially available liquid polysulfide rubbers may be used.
According to another embodiment of the present invention, the ratio of the liquid polysulfide rubber in the corrosion-resistant elastic adhesive protection material can be properly adjusted according to different performance requirements of the corrosion-resistant elastic adhesive protection material according to specific working conditions, and generally, the liquid polysulfide rubber may account for 26.8 to 61.0%, for example, 33.2 to 54.8% of the total weight of the corrosion-resistant elastic adhesive protection composition. By adopting the liquid polysulfide rubber in the proportion, the polysulfide corrosion-resistant elastic bonding protective material with moderate elasticity, high bonding strength with a metal steel structure and adjustable thixotropy can be prepared.
The compositions herein also comprise a crosslinking agent. 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 does not meet the requirements of no toxicity and safety; calcium peroxide and combustible materials are mixed to cause explosiveness and easy burning. The commercial manganese dioxide products have 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 adopting 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 taking 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. The active manganese dioxide may also be commercially available, for example, active manganese dioxide ZY920 from Prokyd Kogaku Co., ltd. Of Zheng Zhongzhou. The active manganese dioxide is different from manganese dioxide prepared by a common manganese ore method in the market, has the characteristics of high purity, strong oxidizing power and stable activity, ensures the performance stability of the component B, and ensures that the material has stable process and mechanical properties after being cured.
In one embodiment, the weight ratio of the liquid polysulfide rubber to the cross-linking agent is (12.7-18.8): 1.
In one embodiment, the corrosion inhibiting elastic adhesive protective material composition contains 26.8 to 61.0% by weight of liquid polysulfide rubber and 1.4 to 4.8% by weight of crosslinking agent, for example, (33.2 to 54.8%) by weight of liquid polysulfide rubber and (1.5 to 3.9%) by weight of crosslinking agent, based on the total weight of the corrosion inhibiting elastic adhesive protective material composition. By adopting the proportion, the method has the following advantages: the complete crosslinking in the design time is ensured, and the phenomena of continuous reduction and hardening of the elasticity of the material, bonding, fatigue resistance, long-term attenuation and the like caused by continuous crosslinking along with the time extension are avoided.
The compositions of the present application also include activated wollastonite powder. In one embodiment, the activated wollastonite powder is a stearic acid surface-treated wollastonite powder having a particle size of 1500 mesh to 2500 mesh. In one embodiment, the activated wollastonite powder comprises from 7.2% to 19.0%, for example from 13.7% to 14.2%, by weight of the total weight of the corrosion inhibiting elastomeric bonding protective composition.
The compositions of the present application also include a corrosion inhibitor. In one embodiment, the corrosion inhibitor may be selected from one or more of phytic acid, benzotriazole (BTZ), zinc phosphate. Preferably, the corrosion inhibitor is selected from the combination of phytic acid and benzotriazole, and preferably, the corrosion inhibitor is selected from the combination of phytic acid and benzotriazole with the mass ratio of (0.5-3): 1, especially 2. The corrosion inhibitor accounts for 1.8-9.9% of the total weight of the corrosion-inhibiting elastic bonding protection composition, such as 3.0-5.0%.
The composition of the present application also comprises an anti-aging agent. The anti-aging agent accounts for 0.9-2.9% of the total weight of the corrosion-resistant elastic bonding protection composition. In one embodiment, the anti-aging agent may be selected from one or more of phenolic anti-aging agents, such as substituted phenolic anti-aging agents. The substituted phenol antioxidant can be one or more of antioxidant SP, antioxidant 264, antioxidant 2246-S, antioxidant 1010, antioxidant 1076 and antioxidant 1035.
In one embodiment, the corrosion inhibiting elastomeric bond protective material of the present application further comprises one or more additives selected from the group consisting of plasticizers, reinforcing fillers, coupling agents, thixotropic agents, and the like.
In one embodiment, the corrosion-inhibiting elastic adhesive protective material composition can be packaged into two-component compositions A and B for convenient transportation and storage, and the liquid polysulfide rubber and the crosslinking agent are respectively contained in different components. For example, the A component comprises a liquid polysulfide rubber and the B component comprises a crosslinking agent. And vice versa.
In one embodiment, a corrosion inhibiting elastomeric bonding protective 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:
30-65 wt% of liquid polysulfide rubber;
5-20 wt% of plasticizer;
8 to 20 weight percent of active wollastonite powder;
2-10 wt% of corrosion inhibitor;
15-52 wt% of reinforcing filler;
0.2 to 3 weight percent of coupling agent;
1-3 wt% of anti-aging agent;
the component B comprises the following components in percentage by weight based on the total weight of the component B:
25-45 wt% of a crosslinking agent;
35-60 wt% of plasticizer;
3.5 to 20 weight percent of thixotropic agent;
0.5 to 8 wt% of corrosion inhibitor;
in one embodiment, the mass ratio of the A component to the B component is 100.
In one embodiment, the plasticizer may be selected from one or more of dioctyl terephthalate, polyol benzoate.
In one embodiment, the reinforcing filler may be selected from one or more of activated calcium carbonate, nano calcium carbonate, diatomaceous earth, lithopone, titanium dioxide, carbon black.
In one embodiment, the coupling agent may be selected from one or more of a sulfur-containing silane coupling agent or an epoxy silane coupling agent.
In one embodiment, the thixotropic agent may be selected from one or more of fumed silica, calcium stearate, bentonite, nano calcium carbonate.
The present application also relates to an etch-resistant elastomeric bonding protective material formed from the etch-resistant elastomeric bonding protective composition of the present application. The components of the corrosion inhibiting elastic adhesive protective composition are fully mixed, applied to a structure to be protected and cured for a period of time to form the corrosion inhibiting elastic adhesive protective material. The material has good sealing property, elasticity and fatigue resistance, and can relieve stress; the bonding to the metal steel structure is stable, the accelerated corrosion speed of the stress cracks is avoided or relieved to a certain extent, and effective protection is achieved; meanwhile, the ultraviolet radiation resistance stability is improved on the basis of the traditional polysulfide sealant, the corrosion of external corrosive media to a metal steel structure can be blocked for a long time, the service life of the bridge is prolonged, and the potential safety hazard is reduced; in addition, the material has certain plasticity, can fill up the depression at the welding seam, does not sag, and ensures the attractiveness of the bridge.
The corrosion-resistant elastic bonding protective material has good sealing property, elasticity and fatigue resistance, and can relieve stress; the bonding to the metal steel structure is stable, the accelerated corrosion speed of stress cracks is avoided or relieved to a certain extent, and effective protection is achieved; meanwhile, the stability of ultraviolet radiation resistance is improved on the basis of the traditional polysulfide sealant, the corrosion of external corrosive media to a metal steel structure can be blocked for a long time, the service life of a bridge is prolonged, and potential safety hazards are reduced; in addition, the material has certain plasticity, can fill up the depression at the welding seam, does not sag, and ensures the attractiveness of the bridge. The material of the present invention can be applied to the surface protection of a metal steel structure to form an elastic adhesive sealing material with a thickness of about 2 to 6mm, but the actual application thickness is not limited.
Examples
In the following examples, a liquid diethoxy-methane polysulfide polymer having a number average molecular weight of 4000 and a degree of crosslinking of 0.5 was used as the liquid polysulfide rubber. The liquid polysulfide rubber was obtained from Toray corporation of Japan.
In the following examples, the crosslinking agent used was activated manganese dioxide ZY920 produced by Zhongzheng Sisinodangaku GmbH; the surface of the used active wollastonite powder is treated by stearic acid; the corrosion inhibitor is compounded by phytic acid and benzotriazole; the plasticizers used were commercially available dioctyl terephthalate (hereinafter, abbreviated as "DOTP"), commercially available polyol benzoate (hereinafter, abbreviated as "DEDB"); the reinforcing filler used was commercially available lithopone; the used anti-aging agent is a commercial antioxidant 1010; the coupling agent used is gamma-mercaptopropyltriethoxysilane; the thixotropic agent used is fumed silica.
Example 1:
the component A of the corrosion-resistant elastic bonding protective material used in the embodiment comprises the following components in parts by weight:
component A
35% by weight of liquid polysulfide rubber
DOTP 17% by weight
1500 meshes of active wollastonite powder 15 wt%
Phytic acid 1% by weight
Benzotriazole 2% by weight
Lithopone 28% by weight
Antioxidant 1010 1% by weight
1% by weight of gamma-mercaptopropyltriethoxysilane
The component B of the corrosion-resistant elastic bonding protective material used in the embodiment comprises the following components in parts by weight:
b component
26% by weight of activated manganese dioxide
DEDB 57 wt.%
Fumed silica 14 wt.%
Phytic acid 1.5% by weight
Benzotriazole 1.5% by weight
When in use, the A and B components are combined according to the weight ratio of 100.
Example 2
The component A of the corrosion-resistant elastic bonding protective material used in the embodiment comprises the following components in parts by weight:
component A
49% by weight of liquid polysulfide rubber
DOTP 6% by weight
1500 meshes of active wollastonite powder 15 wt%
Phytic acid 3% by weight
Benzotriazole 1.5% by weight
Lithopone 22.5% by weight
Antioxidant 1010 2 wt%
1% by weight of gamma-mercaptopropyltriethoxysilane
The component B of the corrosion-resistant elastic bonding protective material used in the embodiment comprises the following components in parts by weight:
b component
35% by weight of activated manganese dioxide
DEDB 42% by weight
Fumed silica 17 wt.%
Phytic acid 4% by weight
Benzotriazole 2% by weight
When in use, the component A and the component B are combined according to the weight ratio of 100.
Example 3
The component A of the corrosion-resistant elastic bonding protective material used in the embodiment comprises the following components in parts by weight:
component A
60% by weight of liquid polysulfide rubber
DOTP 5% by weight
11% by weight of 2000-mesh active wollastonite powder
Phytic acid 3% by weight
Benzotriazole 1.5% by weight
Lithopone 15.5% by weight
Antioxidant 1010 3 wt%
1% by weight of gamma-mercaptopropyltriethoxysilane
The component B of the corrosion-resistant elastic bonding protective material used in the embodiment comprises the following components in parts by weight:
b component
42% by weight of activated manganese dioxide
DEDB 39% by weight
Fumed silica 13 wt%
Phytic acid 4% by weight
Benzotriazole 2% by weight
When in use, the A and B components are combined according to the weight ratio of 100.
Comparative example 1:
the component A of the corrosion-resistant elastic bonding protective material used in the comparative example comprises the following components in parts by weight based on the total weight of the component A:
25% by weight of liquid polysulfide rubber
DOTP 28% by weight
15% by weight of activated wollastonite powder
Phytic acid 2% by weight
Benzotriazole 1% by weight
Lithopone 27% by weight
Antioxidant 10101% by weight
1% by weight of gamma-mercaptopropyltriethoxysilane
The component B comprises the following components in percentage by weight based on the total weight of the component B:
35% by weight of active manganese dioxide
DEDB 42% by weight
Phytic acid 4% by weight
Benzotriazole 2% by weight
17 percent by weight of nano calcium carbonate
When in use, the mass ratio of the component A to the component B is 100. And curing to obtain the corrosion-resistant elastic bonding protective material.
Comparative example 2
The component A of the corrosion-resistant elastic bonding protective material used in the comparative example comprises the following components in parts by weight based on the total weight of the component A:
49% by weight of liquid polysulfide rubber
DOTP 8% by weight
1500 meshes of active wollastonite powder 8 wt%
12% by weight of benzotriazole
Lithopone 21% by weight
Antioxidant 10101 wt%
1% by weight of gamma-mercaptopropyltriethoxysilane
The component B comprises the following components in parts by weight:
35% by weight of activated manganese dioxide
DEDB 42% by weight
Fumed silica 17% by weight
Benzotriazole 6% by weight
When in use, the mass ratio of the component A to the component B is 100. And curing to obtain the corrosion-resistant elastic bonding protective material.
Comparative example 3
The component A of the corrosion-resistant elastic bonding protective material used in the comparative example comprises the following components in parts by weight:
49% by weight of liquid polysulfide rubber
DOTP 10 wt%
1500 meshes of active wollastonite powder 15 wt%
Lithopone 25% by weight
1% by weight of gamma-mercaptopropyltriethoxysilane
The component B comprises the following components in parts by weight:
35% by weight of activated manganese dioxide
DEDB 46 wt.%
Fumed silica 19% by weight
When in use, the mass ratio of the component A to the component B is 100. Curing to obtain the corrosion-resistant elastic bonding protective material.
Comparative example 4
The component A of the corrosion-resistant elastic bonding protective material used in the comparative example comprises the following components in parts by weight:
49% by weight of liquid polysulfide rubber
DOTP 15 wt%
Phytic acid 3% by weight
Benzotriazole 1.5% by weight
Lithopone 29.5% by weight
Antioxidant 10101 wt%
1% by weight of gamma-mercaptopropyltriethoxysilane
The component B comprises the following components in percentage by weight based on the total weight of the component B:
35% by weight of activated manganese dioxide
DEDB 42% by weight
Fumed silica 17% by weight
Phytic acid 4% by weight
Benzotriazole 2% by weight
When in use, the mass ratio of the component A to the component B is 100. Curing to obtain the corrosion-resistant elastic bonding protective material.
Test example:
the welding seam protection engineering of the bridge steel structure needs to evaluate the corrosion resistance, heat resistance, ultraviolet aging resistance, long-term fatigue resistance and the like of the material, and meanwhile, the constructability (sagging/drooping) of the material is considered for the convenience of construction. To illustrate the performance characteristics of the corrosion-inhibiting elastic adhesive protective material of the present invention, the following performance tests were performed on the above examples and comparative examples:
(1) sag (50 ℃ C.. Times.24 h);
(2) preparing a 180-degree stripping sample of the steel-flexible material, and testing the corrosion resistance;
(3) preparing a dumbbell sample, and testing heat resistance;
(4) preparing a dumbbell sample, and testing ultraviolet aging property;
(5) steel-steel i-shaped specimens were prepared and tested for fatigue resistance.
The sag is used for evaluating the flowability of the material; the sagging refers to the sagging of the material in the vertical direction; the sag is tested according to method A of GB/T13477: the two-component compositions were weighed and mixed uniformly according to the specified ratios, poured into the specified sag mold, and after the sample was placed at 50 ℃ for 24 hours, the maximum distance of movement in the vertical direction was measured. And evaluating the sagging performance capability of the corrosion-resistant elastic bonding protective material in the construction process by comparing the sagging numerical values of the corrosion-resistant elastic bonding protective material.
TABLE 1 sag data sheet of different corrosion-inhibiting elastic bonding protective materials
The corrosion resistance is used for evaluating the self corrosion resistance of the corrosion-resistant elastic bonding protective material and the corrosion protection capability on a metal base material, and is carried out according to JT/T694: after the maintenance of a 180-degree stripping sample of the prepared steel-flexible material is finished, the sample is immersed in a 3% sodium chloride aqueous solution for 20 days at 60 ℃, and then taken out to check whether the corrosion-resistant compound has obvious stickiness, cracks and loss of adhesion; after being taken out and left for 24 hours under standard laboratory conditions, the peel strength was tested. The corrosion resistance of the corrosion-resistant elastic bonding protective material is evaluated by comparing the decay rate of the appearance and the peel strength of the corrosion-resistant elastic bonding protective material after corrosion resistance.
TABLE 2 Corrosion-resistance data sheet of different corrosion-resistant elastic bonding protective materials
The heat resistance is used for evaluating the self ability of the corrosion-resistant elastic bonding protective material to resist thermal-oxidative aging and is carried out according to JT/T694: preparing the corrosion-resistant elastic bonding protective material into a 1-type dumbbell sample according to GB/T528, after maintenance is completed, putting the dumbbell sample into an electric heating air blowing drying oven (120 +/-2) for treatment at the temperature of 7d, taking the dumbbell sample out, placing the dumbbell sample under standard laboratory conditions for 24h, and testing according to GB/T528. The heat resistance of the corrosion-resistant elastic adhesive protective material was evaluated by comparing the attenuation rates of the aged dumbbell test specimens.
TABLE 3 Heat resistance data table for different corrosion-inhibiting elastic bonding protective materials
The ultraviolet aging resistance refers to the ability of the corrosion-resistant elastic bonding protective material to be stable in performance after the material itself resists ultraviolet irradiation, and the ability of the material to resist ultraviolet irradiation is represented. The uv resistance test is performed according to the provisions of GB16776, appendix a: preparing the corrosion-resistant elastic bonding protective material into a 1-type dumbbell sample according to GB/T528, after maintenance is completed, putting the dumbbell sample into an ultraviolet box to irradiate for 500 hours, taking out the dumbbell sample after the maintenance is completed, placing the dumbbell sample under standard laboratory conditions for 24 hours, and testing according to GB/T528. And evaluating the ultraviolet aging resistance of the corrosion-resistant elastic bonding protective material by comparing the attenuation rate of the dumbbell sample after aging treatment.
TABLE 4 ultraviolet aging resistance data sheet for different corrosion-resistant elastic bonding protective materials
The fatigue resistance is used for evaluating the performance of the material after continuous stretching-compression deformation, and representing the influence of the continuous stretching-compression deformation on the material performance; the fatigue performance test sample is used for preparing a steel-steel I-shaped test sample according to GB/T13477.8, and is tested according to the regulation of JG/T471, and the tensile bonding strength after fatigue is tested. And evaluating the fatigue resistance of the corrosion-resistant elastic bonding protective material by comparing the performance attenuation rate of the corrosion-resistant elastic bonding protective material after a fatigue test.
TABLE 5 fatigue resistance data table for different corrosion-resistant elastic bonding protective materials
The test data for the above examples and comparative examples show that:
compared with the examples 1 to 3, the comparative example 1 has no thixotropic agent, has 10mm sag, has serious sagging phenomenon and is inconvenient to construct; the thixotropic agent is added in the examples 1 to 3, and the sag test shows that the coating does not sag and the construction operability is strong. Thixotropic agents are an important aspect of the corrosion inhibiting elastomeric bonding protective materials of the present invention that affects sag performance.
Compared with the examples 1 to 3, in the comparative example 1, the liquid polysulfide rubber accounts for 24.0 percent of the total weight of the corrosion-resistant elastic bonding protection composition, and is lower than the range of the invention; the weight ratio of the liquid polysulfide rubber to the crosslinking agent in comparative example 1 is 10.9, which is lower than the range of the present invention; the ratio of the liquid polysulfide rubber and the crosslinking agent in comparative example 1 is not matched, so that the crosslinking degree of comparative example 1 is low and the corrosion resistance is poor; comparative example 3, in which no corrosion inhibitor was added, had poor corrosion resistance; the corrosion inhibitor in the comparative example 2 is of a single type, and the corrosion resistance is superior to that of the comparative example 3 without adding the corrosion inhibitor, but is inferior to that of the examples 1 to 3 adopting the compound corrosion inhibitor; the compound corrosion inhibitor is adopted in each of the examples 1 to 3, but the compound corrosion inhibitors with optimized proportion are adopted in the examples 2 to 3, and the corrosion resistance is equivalent and superior to that of the example 1; in comparative example 4, the corrosion resistance of the paint is inferior to that of examples 1 to 3 because the compounded corrosion inhibitor is added in an optimized proportion, but the wollastonite powder which can synergically enhance the corrosion resistance with the corrosion inhibitor is not added. Whether a corrosion inhibitor is added into the corrosion-resistant elastic bonding protection material or not is an important aspect influencing the corrosion resistance of the corrosion-resistant elastic bonding protection material; the type and proportion of corrosion inhibitor added in the corrosion-resistant elastic bonding protective material, whether wollastonite powder and the corrosion inhibitor are added for synergistic interaction, and the ratio adjustment of the liquid polysulfide rubber and the cross-linking agent are important aspects for realizing the optimization of the corrosion resistance of the corrosion-resistant elastic bonding protective material.
Compared with the examples 1 to 3, the compound corrosion inhibitor and the wollastonite powder of the invention cannot achieve the purpose of synergistic heat resistance in the comparative example 3 without adding the corrosion inhibitor and the wollastonite powder in the comparative example 4, and the heat resistance is poorer than that of the examples 1 to 3. Whether the wollastonite powder and the corrosion inhibitor are added into the corrosion-resistant elastic bonding protective material for synergy or not is an important aspect for realizing the heat resistance of the corrosion-resistant elastic bonding protective material.
Compared with the examples 1 to 3, the comparative examples 2 to 3 have the advantages that the single corrosion inhibitor is added in the comparative example 2, the corrosion inhibitor is not added in the comparative example 3, the purposes of synergy and ultraviolet aging resistance of the compounded corrosion inhibitor cannot be realized, and the ultraviolet aging resistance is not as good as that of the examples 1 to 3. The addition of the compound corrosion inhibitor is an important aspect of enhancing the ultraviolet aging resistance of the corrosion-resistant elastic bonding protective material.
Comparative examples 1 and 3 compared with examples 1 to 3, the weight ratio of the liquid polysulfide rubber to the crosslinking agent in comparative example 1 is lower than the range of the present invention; the proportion of the liquid polysulfide rubber and the cross-linking agent in the comparative example 1 is not matched, so that the comparative example 1 has low cross-linking degree, incomplete curing of a system and poor fatigue resistance; in the comparative example 3, no anti-aging agent is added, and the system has poor external force resistance and poor fatigue resistance. The proportion of the liquid polysulfide rubber and the cross-linking agent and whether the anti-aging agent is added or not are important aspects influencing the fatigue resistance of the corrosion-resistant elastic bonding protective material.
The present application has been described above in connection with preferred embodiments, which are intended to be exemplary only and illustrative only. On the basis of the above, the present application can be subjected to various substitutions and improvements, and the substitutions and the improvements are all within the protection scope of the present application.
Claims (11)
1. An etch-resistant elastomeric bond protecting composition comprising:
liquid polysulfide rubber with number average molecular weight of 2500-7500 and crosslinking degree of 0-2;
a crosslinking agent;
a corrosion inhibitor;
activated wollastonite powder;
an anti-aging agent;
wherein the weight ratio of the liquid polysulfide rubber to the cross-linking agent is 12.1-23.9: 1;
the liquid polysulfide rubber accounts for 26.8 to 61.0 percent of the total weight of the corrosion-resistant elastic bonding protection composition,
the cross-linking agent accounts for 1.4-4.8% of the total weight of the waterproof elastic sealing material,
the active wollastonite powder accounts for 7.1 to 18.9 percent of the total weight of the corrosion-resistant elastic bonding protective composition,
the corrosion inhibitor accounts for 1.8 to 9.9 percent of the total weight of the corrosion-resistant elastic bonding protection composition;
the anti-aging agent accounts for 0.9-2.9% of the total weight of the corrosion-resistant elastic bonding protection composition.
2. The corrosion inhibiting elastomeric bond protectant composition of claim 1, wherein said crosslinker is activated manganese dioxide.
3. The corrosion inhibiting elastic adhesive protective composition according to claim 1, wherein the corrosion inhibitor accounts for 1.8-9.9% of the total weight of the corrosion inhibiting elastic adhesive protective composition; preferably, the corrosion inhibitor is selected from one or more of phytic acid, benzotriazole (BTZ) and zinc phosphate; more preferably, the corrosion inhibitor is selected from the group consisting of phytic acid in combination with benzotriazole; preferably, the mass ratio of the combination of phytic acid and benzotriazole is 0.5 to 3.
4. The corrosion inhibiting elastomeric bonding protective composition of claim 1, wherein said activated wollastonite powder is stearic acid treated wollastonite powder having a particle size of 1500 to 2500 mesh.
5. The corrosion inhibiting elastomeric bond protecting composition of claim 1, wherein said antioxidant is a substituted phenolic antioxidant.
6. The corrosion inhibiting elastomeric adhesive protective composition according to claim 1 further comprising one or more additives selected from the group consisting of plasticizers, reinforcing fillers, coupling agents, thixotropic agents.
7. The corrosion inhibiting elastomeric bonding protective composition of any one of claims 1 to 6 comprising 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:
30-65 wt% of liquid polysulfide rubber;
the component B comprises the following components in percentage by weight based on the total weight of the component B:
8. the corrosion inhibiting elastic adhesive protective composition according to claim 7, wherein the mass ratio of the component A to the component B is 100 to 6-12.
9. The corrosion inhibiting elastomeric adhesive protective composition of claim 6,
the plasticizer is selected from one or more of dioctyl terephthalate and polyol benzoate;
the reinforcing filler is selected from one or more of active calcium carbonate, nano calcium carbonate, diatomite, lithopone, titanium dioxide and carbon black;
the coupling agent is selected from one or more of sulfur-containing silane coupling agent or epoxy silane coupling agent;
the thixotropic agent is selected from one or more of fumed silica, calcium stearate, bentonite and nano calcium carbonate.
10. An etch resistant elastomeric adhesion protection material formed from an etch resistant elastomeric adhesion protection composition according to any one of claims 1 to 9.
11. The corrosion inhibiting elastic bonding protective material of claim 10, wherein the corrosion inhibiting elastic bonding protective material is applied to steel structure protection.
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