阅读说明：本技术 耐海水环氧涂料的固化剂及制备方法和耐海水环氧涂料 (Curing agent of seawater-resistant epoxy coating, preparation method of curing agent and seawater-resistant epoxy coating ) 是由 唐勇 蓝伟生 楼建松 丰雷 刘智星 蓝文龙 徐琮皓 毛晓东 王特立 于 2021-11-25 设计创作，主要内容包括：本发明提供耐海水环氧涂料的固化剂及制备方法和耐海水环氧涂料及应用,具体涉及涂料技术领域。该耐海水环氧涂料的固化剂,包括按质量份数计的如下组分：双酚F型环氧树脂20-22份、丙二酚4-5份、聚氧丙烯三胺15-17.5份和间苯二甲胺15-17份。该耐海水环氧涂料的固化剂,在施工时海水上涨的情况下能继续发生固化反应,聚氧丙烯三胺增加固化剂中的胺基团量,促进固化反应,从而增加漆膜厚度,提高防腐性能。该耐海水环氧涂料在A组分和B组分混合后形成紧密的涂层,该涂层具有耐热、耐水、耐盐、耐腐蚀等性能,而且耐冲击、力学性能较高,防腐性能可达到30年,有效保护了特殊环境下工业设备的寿命。(The invention provides a curing agent of a seawater-resistant epoxy coating, a preparation method of the curing agent, the seawater-resistant epoxy coating and application of the seawater-resistant epoxy coating, and particularly relates to the technical field of coatings. The curing agent of the seawater-resistant epoxy coating comprises the following components in parts by weight: 20-22 parts of bisphenol F epoxy resin, 4-5 parts of propylene diphenol, 15-17.5 parts of polyoxypropylene triamine and 15-17 parts of m-xylylenediamine. The curing agent of the seawater-resistant epoxy coating can continue to generate a curing reaction under the condition that seawater rises during construction, and the polyoxypropylene triamine increases the amount of amine groups in the curing agent and promotes the curing reaction, so that the thickness of a paint film is increased, and the corrosion resistance is improved. The seawater-resistant epoxy coating forms a compact coating after the component A and the component B are mixed, the coating has the performances of heat resistance, water resistance, salt resistance, corrosion resistance and the like, and has high impact resistance and mechanical property, the corrosion resistance can reach 30 years, and the service life of industrial equipment in a special environment is effectively protected.)

1. The curing agent for the seawater-resistant epoxy coating is characterized by comprising the following components in parts by mass: 20-22 parts of bisphenol F epoxy resin, 4-5 parts of propylene diphenol, 15-17.5 parts of polyoxypropylene triamine and 15-17 parts of m-xylylenediamine.

2. The curing agent for seawater-resistant epoxy paint as claimed in claim 1, wherein the curing agent for seawater-resistant epoxy paint further comprises at least one of a stabilizer, a curing accelerator and a first solvent;

preferably, the stabilizer comprises benzyl alcohol;

preferably, the first solvent comprises xylene or isobutanol.

3. The method for preparing the curing agent for seawater-resistant epoxy paint according to claim 1 or 2, characterized by comprising the following steps:

step a: mixing and reacting the propylene glycol and the m-xylylenediamine, adding the bisphenol F epoxy resin, uniformly mixing and standing to obtain a semi-finished curing agent of the seawater-resistant epoxy coating;

step b: and adding the polyoxypropylene triamine and an optional curing accelerator into the semi-finished product of the curing agent of the seawater-resistant epoxy coating, and uniformly mixing to obtain the curing agent of the seawater-resistant epoxy coating.

4. The method according to claim 3, wherein the time for the standing is 72 to 96 hours;

preferably, the standing time is 72-84 h;

preferably, the standing time is 76 h.

5. The seawater-resistant epoxy coating is characterized by comprising a component A and a component B;

the component A comprises the following components in parts by mass: 4-5 parts of C9 petroleum resin, 20-25 parts of bisphenol A epoxy resin and 6-7 parts of low molecular weight epoxy resin;

wherein the component B is the curing agent of the seawater-resistant epoxy coating material of claim 1 or 2 or the curing agent of the seawater-resistant epoxy coating material prepared by the preparation method of claim 3 or 4;

the mass ratio of the component A to the component B is 82-86: 16.

6. The seawater-resistant epoxy coating as claimed in claim 5, wherein the component A comprises the following components in parts by mass: 1.8-2.5 parts of C9 petroleum resin, 20-23 parts of bisphenol A epoxy resin and 6-7 parts of low molecular weight epoxy resin;

preferably, the low molecular weight epoxy resin has a molecular weight of 400-1400;

preferably, the component A also comprises 2-5 parts of epoxy resin modifier, 3-10 parts of pigment and 36-60 parts of filler in parts by mass;

preferably, the component A also comprises 3-4.5 parts of epoxy resin modifier, 4-6 parts of pigment and 40-55 parts of filler in parts by mass.

7. The seawater-resistant epoxy paint as claimed in claim 6, wherein the pigment comprises titanium dioxide;

preferably, the filler comprises at least one of aluminum clay, talc, quartz powder, and precipitated barium sulfate;

preferably, the a component further comprises an additive and/or a second solvent;

preferably, the second solvent comprises xylene or isobutanol.

8. Seawater-resistant epoxy paint as claimed in claim 5 or 6, wherein the additive comprises at least one of thixotropic agent, epoxy diluent, silane coupling agent and defoaming agent.

9. Use of a seawater resistant epoxy coating according to any of claims 5-8 in the field of industrial protection.

10. The use according to claim 9, wherein the industrial protection sector comprises coastal bridges, harbour machinery, offshore wind power piles, ships and offshore oil platforms;

preferably, the coastal bridge comprises bridge columns;

preferably, the bridge post comprises a cement bridge post and a steel bridge post.

Technical Field

The invention relates to the technical field of coatings, in particular to a curing agent of a seawater-resistant epoxy coating, a preparation method of the curing agent and the seawater-resistant epoxy coating.

Background

Industrial equipment in tidal zones and splash zones has high corrosion degree under the alternate contact of seawater, and in order to protect the industrial equipment, the condition of preventing corrosion is necessary to increase the film thickness of a coating on the industrial equipment. However, the thickness of the dry film in a tidal zone and a splash zone is more than 1000 microns, 3-4 construction runs need to be completed by using the conventional coating, the construction is influenced by weather and construction environment, the intermediate time is long, the rising of seawater causes great troubles to the drying of the traditional coating, and the anticorrosion effect of the coating is influenced.

In view of the above, the present invention is particularly proposed.

Disclosure of Invention

The invention aims to provide a curing agent for seawater-resistant epoxy paint, which is used for relieving the technical problems that the paint needs to be constructed for many times and the curing process is influenced by seawater in the prior art.

The second purpose of the invention is to provide the preparation method of the seawater-resistant epoxy paint curing agent, which has the advantages of simple preparation process and convenient operation and is suitable for large-scale industrial production.

The third purpose of the invention is to provide a seawater-resistant epoxy coating, which alleviates the technical problems that the coating needs to be constructed for many times and the corrosion resistance effect is poor in the prior art.

The fourth purpose of the invention is to provide the application of the seawater-resistant epoxy coating in the field of industrial protection, which can improve the construction efficiency, reduce the coating cost, save the construction cost and greatly improve the corrosion resistance of industrial equipment.

In order to solve the technical problems, the invention adopts the following technical scheme:

the invention provides a curing agent of seawater-resistant epoxy paint, which comprises the following components in parts by mass: 20-22 parts of bisphenol F epoxy resin, 4-5 parts of propylene diphenol, 15-17.5 parts of polyoxypropylene triamine and 15-17 parts of m-xylylenediamine.

Optionally, the curing agent for seawater-resistant epoxy paint further comprises at least one of a stabilizer, a curing accelerator and a first solvent.

Preferably, the stabilizer comprises benzyl alcohol.

Preferably, the first solvent comprises xylene or isobutanol.

The second aspect of the invention provides a preparation method of the curing agent for seawater-resistant epoxy paint, which comprises the following steps:

step a: mixing and reacting the propylene glycol and the m-xylylenediamine, adding the bisphenol F epoxy resin, uniformly mixing and standing to obtain a semi-finished curing agent of the seawater-resistant epoxy coating;

step b: and adding the polyoxypropylene triamine and an optional curing accelerator into the semi-finished product of the curing agent of the seawater-resistant epoxy coating, and uniformly mixing to obtain the curing agent of the seawater-resistant epoxy coating.

Optionally, the standing time is 72-96 h.

Preferably, the standing time is 72-84 h.

Preferably, the standing time is 76 h.

The third aspect of the invention provides a seawater-resistant epoxy coating which is composed of a component A and a component B;

the component A comprises the following components in parts by mass: 4-5 parts of C9 petroleum resin, 20-25 parts of bisphenol A epoxy resin and 6-7 parts of low molecular weight epoxy resin.

Wherein the component B is the curing agent of the seawater-resistant epoxy coating in the first aspect or the curing agent of the seawater-resistant epoxy coating prepared by the preparation method in the second aspect.

The mass ratio of the component A to the component B is 82-86: 16.

Preferably, the component A comprises the following components in parts by weight: 2-3 parts of C9 petroleum resin, 20-25 parts of bisphenol A epoxy resin and 6-7 parts of low molecular weight epoxy resin.

Preferably, the low molecular weight epoxy resin has a molecular weight of 400-1400.

Preferably, the component A also comprises 2-5 parts of epoxy resin modifier, 3-10 parts of pigment and 36-60 parts of filler in parts by mass.

Preferably, the component A also comprises 3-4 parts of epoxy resin modifier, 4-6 parts of pigment and 40-55 parts of filler in parts by mass.

Optionally, the pigment comprises titanium dioxide.

Preferably, the filler comprises at least one of aluminum clay, talc, quartz powder, and precipitated barium sulfate.

Preferably, the a component further comprises an additive and/or a second solvent.

Preferably, the second solvent comprises xylene or isobutanol.

Optionally, the additive includes at least one of a thixotropic agent, an epoxy diluent, a silane coupling agent, and an antifoaming agent.

The fourth aspect of the invention provides the application of the seawater-resistant epoxy coating in the field of industrial protection.

Optionally, the industrial protection field includes coastal bridges, harbour machinery, offshore wind power piles, ships and offshore oil platforms.

Preferably, the coastal bridge comprises bridge columns.

Preferably, the bridge post comprises a cement bridge post and a steel bridge post.

Compared with the prior art, the invention has at least the following beneficial effects:

according to the curing agent for the seawater-resistant epoxy coating, provided by the invention, the chain extension reaction is firstly carried out on propylene glycol and m-xylylenediamine, then the bisphenol F type epoxy resin is added for pre-reaction, so that the bisphenol F type epoxy resin and amino are subjected to intermediate chain addition, and the generated intermediate chain can be continuously subjected to the curing reaction under the condition that seawater rises during construction; the polyoxypropylene triamine is added, so that the amount of amine groups in the curing agent is increased, the underwater curing reaction is promoted, the reaction activity of a paint film is increased, and the corrosion resistance is improved.

The preparation method of the seawater-resistant epoxy paint curing agent provided by the invention has the advantages of simple preparation process, good controllability, large treatment capacity, suitability for mass production and low cost.

In the seawater-resistant epoxy coating provided by the invention, a coating film formed by the C9 petroleum resin, the bisphenol A epoxy resin, the low-molecular-weight epoxy resin and the epoxy resin modifier of the component A has high crosslinking density, and has excellent physical and mechanical properties and chemical medium resistance; the bisphenol F type epoxy resin and the polyoxypropylene triamine in the component B are prepared into a pre-reaction body, so that more reaction groups are generated. When the component A and the component B are mixed, a compact reaction system is formed, so that a coating with high thickness and no sagging can be formed, and the coating can be formed by self-polymerization even under water. The coating has the performances of heat resistance, water resistance, salt resistance, corrosion resistance and the like, and has high impact resistance and mechanical property, the corrosion resistance can reach 30 years, and the service life of industrial equipment in a special environment is effectively protected. Compared with a common solvent type epoxy system, the seawater-resistant epoxy coating provided by the invention has the advantages that the VOC content can be reduced by 30%, and the green environmental protection concept is met.

The seawater-resistant epoxy coating provided by the invention can be formed by one-step construction in the field of industrial protection, so that the construction efficiency is improved, the risks caused by equipment and tide in the construction process are reduced, the coating cost is reduced, the construction cost is saved, the corrosion resistance of industrial equipment is greatly improved, the content of volatile organic compounds is low, and the requirement of the current green and environment-friendly coating is met.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. The components of embodiments of the present invention may be arranged and designed in a wide variety of different configurations.

The invention provides a curing agent of seawater-resistant epoxy paint, which comprises the following components in parts by mass: 20-22 parts of bisphenol F epoxy resin, 4-5 parts of propylene diphenol, 15-17.5 parts of polyoxypropylene triamine and 15-17 parts of m-xylylenediamine.

According to the curing agent for the seawater-resistant epoxy coating, provided by the invention, the chain extension reaction is firstly carried out on propylene glycol and m-xylylenediamine, then the bisphenol F type epoxy resin is added for pre-reaction, so that the bisphenol F type epoxy resin and amino are subjected to intermediate chain addition, and the generated intermediate chain can be continuously subjected to the curing reaction under the condition that seawater rises during construction; the polyoxypropylene triamine is added, so that the amount of amine groups in the curing agent is increased, the underwater curing reaction is promoted, the reaction activity of a paint film is increased, and the corrosion resistance is improved.

Bisphenol F type epoxy resin is also called bisphenol F type diglycidyl ether, BPF for short, and is prepared by reacting phenol with formaldehyde under acid catalysis to generate bisphenol F, and then carrying out polycondensation reaction with epoxy chloropropane in the presence of sodium hydroxide, wherein the system contains a small amount of branched chain structures. The bisphenol F-type epoxy resin can reduce the viscosity of the bisphenol A-type epoxy resin and has excellent performance as the bisphenol A-type epoxy resin. The bisphenol F type epoxy resin is characterized by low viscosity which is less than 1/3 of the viscosity of bisphenol A type epoxy resin and good impregnation property.

In some embodiments of the invention, the amount of bisphenol F type epoxy resin is typically, but not limited to, 20 parts, 20.5 parts, 21 parts, 21.5 parts, 22 parts.

In some embodiments of the invention, the parts by mass of the propylene glycol are typically, but not limited to, 4.1 parts, 4.2 parts, 4.3 parts, 4.4 parts, 4.5 parts, 4.6 parts, 4.7 parts, 4.8 parts, 4.9 parts, or 5 parts.

The special structure of m-xylylenediamine determines that it has various excellent physical and chemical properties, corrosion resistance, chemical resistance and moisture resistance. When reacting with epoxy resin, the epoxy resin can be cured into a film, so that the paint film has higher hardness and water resistance.

In some embodiments of the invention, the mass fraction of m-xylylenediamine is typically, but not limited to, 15 parts, 15.5 parts, 16 parts, 16.2 parts, 16.5 parts, or 17 parts.

The polyoxypropylene triamine has propylene oxide as basic repeating segment in the main chain structure and is ternary amine with polypropylene glycol as main chain. In the reaction with an epoxy system, the reaction rate is uniform, the sagging resistance is good, and the extensibility and the strength of the seawater-resistant epoxy coating can be improved.

In some embodiments of the invention, the mass part of polyoxypropylene triamine is typically, but not limited to, 15 parts, 15.5 parts, 16 parts, 16.5 parts, 17 parts, or 17.5 parts.

Preferably, the curing agent for seawater-resistant epoxy paint further comprises at least one of a stabilizer, a curing accelerator and a first solvent.

Preferably, the B component further comprises at least one of 9-12 parts of a stabilizer, 2.8-3.5 parts of a curing accelerator and 20-22 parts of a first solvent.

Preferably, the stabilizer comprises benzyl alcohol.

In one embodiment of the invention, the stabilizer is typically, but not limited to, benzyl alcohol.

The benzyl alcohol participates in chain extension reaction, and plays a role of a reaction stabilizer, and when the concentration of the benzyl alcohol in a system is low, the reaction is slow or the reaction is terminated. When the dosage of the benzyl alcohol exceeds 12 parts, the chain extension reaction continues; when the amount of benzyl alcohol is less than 9 parts, the chain extension reaction is terminated.

In some embodiments of the invention, the part by mass of benzyl alcohol is typically, but not limited to, 9 parts, 9.5 parts, 10 parts, 10.5 parts, 11 parts, or 12 parts.

Preferably, the first solvent comprises xylene or isobutanol.

In one embodiment of the invention, the first solvent is typically, but not limited to, xylene or isobutanol.

In some embodiments of the invention, the mass fraction of the first solvent is typically, but not limited to, 20 parts, 21 parts, or 22 parts.

In some embodiments of the invention, the mass fraction of the curing accelerator is typically, but not limited to, 2.8 parts, 2.9 parts, 3.0 parts, 3.1 parts, 3.2 parts, 3.3 parts, 3.4 parts, or 3.5 parts.

The second aspect of the invention provides a preparation method of the curing agent for seawater-resistant epoxy paint, which comprises the following steps:

step a: mixing and reacting the propylene glycol and the m-xylylenediamine, adding the bisphenol F epoxy resin, uniformly mixing and standing to obtain a semi-finished curing agent of the seawater-resistant epoxy coating;

step b: and adding the polyoxypropylene triamine and an optional curing accelerator into the semi-finished product of the curing agent of the seawater-resistant epoxy coating, and uniformly mixing to obtain the curing agent of the seawater-resistant epoxy coating.

The preparation method of the seawater-resistant epoxy paint curing agent provided by the invention has the advantages of simple preparation process, good controllability, large treatment capacity, suitability for mass production and low cost.

In one embodiment of the present invention, bisphenol F type epoxy resin is added and pre-reacted at 90 ℃ for 60min to react bisphenol F type epoxy resin with a chain extension reaction product, which is a reaction product between propylene glycol and m-xylylenediamine.

Optionally, the standing time is 72-96 h.

In some embodiments of the invention, the time period for said standing in step c is typically, but not limited to, 72h, 76h, 80h, 84h, 88h, 92h or 96 h.

Preferably, the standing time is 72-84 h.

In some preferred embodiments of the invention, the time of standing is typically, but not limited to, 72h, 80h, 84 h.

Preferably, the standing time is 76 h.

In a more preferred embodiment of the invention, the time of said resting is typically, but not exclusively, 76 h.

The third aspect of the invention provides a seawater-resistant epoxy coating which is composed of a component A and a component B;

the component A comprises the following components in parts by mass: 4-5 parts of C9 petroleum resin, 20-25 parts of bisphenol A epoxy resin and 6-7 parts of low molecular weight epoxy resin.

Wherein the component B is the curing agent of the seawater-resistant epoxy coating in the first aspect or the curing agent of the seawater-resistant epoxy coating prepared by the preparation method in the second aspect.

The mass ratio of the component A to the component B is 82-86: 16.

The molecular weight of the low molecular weight epoxy resin is 400-1400.

The seawater-resistant epoxy coating provided by the invention solves the technical problems that the coating needs to be constructed for many times and the anticorrosion effect is poor in the prior art, and has the characteristics of good water resistance, salt mist resistance and adhesion under the synergistic effect of the raw materials in the anticorrosion and construction processes. The organic film forming materials are combined and then react, so that the corrosion resistance of a paint film is greatly improved, the corrosion resistance can reach 30 years, and the service life of industrial equipment in a special environment is effectively protected. Compared with a common solvent type epoxy system, the seawater-resistant epoxy coating provided by the invention has the advantages that the VOC content can be reduced by 30%, and the green environmental protection concept is met. The solid content of the seawater-resistant epoxy coating in unit volume is more than 85%, and the fluidity and the construction performance of the seawater-resistant epoxy coating are not influenced along with the increase of the solid content.

Optionally, the component A comprises the following components in parts by mass: the component A comprises the following components in parts by mass: 1.8-2.5 parts of C9 petroleum resin, 20-23 parts of bisphenol A epoxy resin and 6-7 parts of low molecular weight epoxy resin.

Preferably, the mass ratio of the A component to the B component is 84: 16.

The C9 petroleum resin is also called aromatic hydrocarbon petroleum resin, has a cyclic structure, contains partial double bonds and has large cohesive force. The molecular structure does not contain polar or functional groups and has no chemical activity. Good acid and alkali resistance, chemical resistance and water resistance. The epoxy resin is compounded with the epoxy resin, so that the pores behind the epoxy hinge can be filled, and the defects of the epoxy resin are improved.

In a preferred embodiment of the invention, the mass fraction of the C9 petroleum resin is typically, but not limited to, 1.8 parts, 2.0 parts, or 2.5 parts.

The bisphenol A epoxy resin uses the epoxy resin as a polyhydroxy component, combines the advantages of polyurethane and epoxy resin, and has better bonding strength and chemical resistance. The chemical activity of the epoxy group can cause the compound containing active hydrogen to open a ring, and the compound is cured and crosslinked to generate a network structure.

In some embodiments of the invention, the amount of bisphenol a type epoxy resin is typically, but not limited to, 20 parts, 20.4 parts, 20.8 parts, 21.2 parts, 21.6 parts, 22 parts, 22.4 parts, 23 parts.

The low molecular weight epoxy resin has excellent corrosion resistance, high hardness, very strong adhesion to almost any substrate, and good flexibility.

In a preferred embodiment of the invention, the low molecular weight epoxy resin is typically, but not limited to, 6 parts, 6.5 parts, or 7 parts by weight.

Epoxy modifiers improve the properties of epoxy resins, which are liquid hydrocarbon resin based adhesives. The epoxy resin can reduce the viscosity of the epoxy resin, improve the flexibility, reduce the surface tension and improve the adhesive force between the epoxy resin and various base materials, so that the epoxy resin has very good ultraviolet resistance, heat resistance, chemical resistance and heat resistance. It has good adhesion to epoxy resins and a high glass transition temperature.

In some embodiments of the invention, the epoxy resin modifier is typically, but not limited to, 3 parts, 3.5 parts, 4 parts, or 4.5 parts by weight.

In some embodiments of the invention, the pigment mass parts are typically, but not limited to, 4 parts, 4.2 parts, 4.5 parts, 4.8 parts, 5.2 parts, 5.5 parts, 6 parts.

In some embodiments of the invention, the mass ratio of the a component to the B component is typically, but not limited to, 82:16, 84:16, or 86: 16.

Optionally, the pigment comprises titanium dioxide.

Preferably, the pigment comprises 4-8 parts of titanium dioxide by mass.

Preferably, the pigment comprises 4-6 parts of titanium dioxide by mass.

In some embodiments of the present invention, the mass fraction of titanium dioxide is typically, but not limited to, 4 parts, 5 parts, 6 parts, 7 parts, or 8 parts.

In some preferred embodiments of the present invention, the mass fraction of titanium dioxide is typically, but not limited to, 4 parts, 5 parts, or 6 parts.

Preferably, the filler comprises at least one of aluminum clay, talc, quartz powder, and precipitated barium sulfate.

In some embodiments of the invention, the filler is typically, but not limited to, aluminum clay, talc, quartz powder, or precipitated barium sulfate.

The filler comprises the following components in parts by weight: 8-12 parts of aluminum clay, 13-16 parts of talcum powder, 6-8.5 parts of quartz powder and 17-20 parts of precipitated barium sulfate.

In some embodiments of the invention, the mass fraction of the aluminum clay is typically, but not limited to, 9 parts, 9.5 parts, 10 parts, 10.5 parts, 11 parts, or 12 parts.

In some embodiments of the invention, the mass fraction of talc is typically, but not limited to, 13 parts, 13.5 parts, 14 parts, 14.5 parts, 15 parts, 15.5 parts, or 16 parts.

In some embodiments of the invention, the mass fraction of the quartz powder is typically, but not limited to, 6 parts, 6.5 parts, 7 parts, 7.5 parts, 8 parts, or 8.5 parts.

In some embodiments of the invention, the mass fraction of precipitated barium sulfate is typically, but not limited to, 17 parts, 17.5 parts, 18 parts, 18.5 parts, 19 parts, or 20 parts.

Preferably, the a component further comprises an additive and/or a second solvent.

Preferably, the second solvent comprises xylene and isobutanol.

In one embodiment of the invention, the second solvent is typically, but not limited to, xylene or isobutanol.

Preferably, the second solvent comprises the following components in parts by mass: 4-5 parts of dimethylbenzene and 2-3 parts of isobutanol.

In one embodiment of the invention, the mass fraction of xylene is typically, but not limited to, 4.0 parts, 4.2 parts, 4.5 parts, or 5 parts.

In one embodiment of the invention the mass fraction of isobutanol is typically, but not limited to, 2.0 parts, 2.2 parts, 2.5 parts, 2.8 parts or 3 parts.

Optionally, the additive includes at least one of a thixotropic agent, an epoxy diluent, a silane coupling agent, and an antifoaming agent.

The additive comprises the following components in parts by weight: 1.4-1.6 parts of thixotropic agent, 1.8-2.2 parts of epoxy diluent, 0.2-0.4 part of silane coupling agent and 0.2-0.4 part of defoaming agent.

In some embodiments of the invention, the additives are typically, but not limited to, thixotropic agents, epoxy diluents, silane coupling agents, and defoamers.

In some embodiments of the invention, the mass fraction of thixotropic agent is typically, but not limited to, 1.4 parts, 1.45 parts, 1.5 parts, 1.55 parts, or 1.6 parts.

In some embodiments of the invention, the thixotropic agent is typically, but not limited to, a modified hydrogenated castor oil or polyamide wax anti-settling anti-sag thixotropic agent.

In some embodiments of the invention, the mass parts of the epoxy diluent are typically, but not limited to, 1.8 parts, 1.9 parts, 2.0 parts, 2.1 parts, or 2.2 parts.

In some embodiments of the invention, the mass fraction of silane coupling agent is typically, but not limited to, 0.2 parts, 0.25 parts, 0.3 parts, 0.35 parts, or 0.4 parts.

In some embodiments of the invention, the mass fraction of the defoamer is typically, but not limited to, 0.2 parts, 0.25 parts, 0.3 parts, 0.35 parts, or 0.4 parts.

Optionally, the preparation method of the component A comprises the following steps:

step x: uniformly mixing an optional first solvent, the C9 petroleum resin, the bisphenol A epoxy resin, the low molecular weight epoxy resin and the epoxy resin modifier to obtain a pre-dissolved substance;

step y: and c, sequentially adding the pigment and the filler into the pre-dissolved substance obtained in the step a, and uniformly mixing for the second time to obtain the component A.

In some embodiments of the present invention, when the fillers are aluminum clay, talc, quartz powder and precipitated barium sulfate, the talc, aluminum clay, quartz powder and precipitated barium sulfate are added in the order of typically, but not exclusively, the order of addition is from small to large according to the specific gravity of the pigment, ensuring that the pigment and filler with small specific gravity are sufficiently stirred. The pigment with larger specific gravity is filled with the potential energy of pressing down.

Preferably, the temperature after the temperature rise is 60-65 ℃.

In some embodiments of the invention, the post-ramp temperature is typically, but not limited to, 60 ℃, 61 ℃, 62 ℃, 63 ℃, 64 ℃ or 65 ℃.

The fourth aspect of the invention provides the application of the seawater-resistant epoxy coating in the field of industrial protection.

The seawater-resistant epoxy coating provided by the invention can be formed by one-step construction in the field of industrial protection, so that the construction efficiency is improved, the risks caused by equipment and tide in the construction process are reduced, the coating cost is reduced, the construction cost is saved, the corrosion resistance of industrial equipment is greatly improved, the content of volatile organic compounds is low, and the requirement of the current green and environment-friendly coating is met.

Optionally, the industrial protection field includes coastal bridges, harbour machinery, offshore wind power piles, ships and offshore oil platforms.

Preferably, the coastal bridge comprises bridge columns.

Preferably, the bridge post comprises a cement bridge post and a steel bridge post.

The present invention will be described in further detail with reference to examples and comparative examples.

The specifications and types of the raw materials used in the examples and comparative examples of the present invention are shown in table 1 below, and if not otherwise specified,% means mass percentage; those who do not specify the conditions are performed according to the conventional conditions or the conditions recommended by the manufacturer.

TABLE 1 raw material specification and model table

Example 1

The embodiment provides a seawater-resistant epoxy coating, which is prepared by the following steps:

(1) adding 4 parts of dimethylbenzene, 3 parts of isobutanol, 21 parts of bisphenol A epoxy resin, 6.2 parts of low-molecular-weight epoxy resin, 4 parts of epoxy resin modifier, 0.4 part of modified hydrogenated castor oil, 1.4 parts of DISPARLON 6650 and 2 parts of C9 petroleum resin in sequence, and stirring at 600rpm for 20min to obtain a pre-dissolved substance.

(2) 5 parts of titanium dioxide, 10 parts of aluminum clay, 15 parts of talcum powder, 7.2 parts of quartz powder and 18 parts of precipitated barium sulfate are sequentially added into the pre-dissolved matter, the rotating speed is increased to 1200rpm to enable the temperature in the container to reach 62 ℃, and then the rotating speed is reduced to 600rpm to be kept for 30min to obtain a semi-finished product of the component A.

(3) And 2 parts of epoxy diluent, 0.3 part of silane coupling agent and 0.3 part of defoaming agent are added into the semi-finished product of the component A and stirred for 20min at 600rpm to obtain the component A.

(4) 10.4 parts of benzyl alcohol, 15.5 parts of xylene, 5.5 parts of isobutanol, 4.8 parts of propanediol and 16.7 parts of m-xylylenediamine are added and stirred at 600rpm for 10 min. Then, 21 parts of bisphenol F type epoxy resin is gradually added, evenly stirred and then kept stand for 72 hours to obtain a semi-finished product of the component B. And (3) after standing, stirring the semi-finished product of the component B for 5min at 600rpm, sequentially adding 16.1 parts of polyoxypropylene triamine, 7.2 parts of xylene and 2.8 parts of a curing accelerator DMP-30, and stirring at 600rpm for 20min to obtain the component B.

(5) The mass ratio of the component A to the component B is 84: 16.

Example 2

The embodiment provides a seawater-resistant epoxy coating, which is different from embodiment 1 in that in the component A, 5 parts of dimethylbenzene, 5 parts of isobutanol, 22 parts of bisphenol A epoxy resin, 5.2 parts of low-molecular-weight epoxy resin, 4.2 parts of epoxy resin modifier, 0.5 part of modified hydrogenated castor oil, 1.5 parts of DISPARLON 6650, 2.5 parts of C9 petroleum resin, 5.5 parts of titanium dioxide, 11 parts of aluminum clay, 14 parts of talcum powder, 10 parts of quartz powder, 16 parts of precipitated barium sulfate, 2.5 parts of epoxy diluent, 0.32 part of silane coupling agent and 0.38 part of defoaming agent are contained; in the component B, 12.5 parts of benzyl alcohol, 20 parts of dimethylbenzene, 5 parts of propylene glycol, 17.5 parts of m-xylylenediamine, 22 parts of bisphenol F epoxy resin, 16 parts of polyoxypropylene triamine and 3 parts of a curing accelerator DMP-30 are used, and the rest raw materials and preparation steps are the same as those in example 1 and are not repeated.

Example 3

The embodiment provides a seawater-resistant epoxy coating, which is different from the embodiment 1 in that the component A comprises 20 parts of bisphenol A epoxy resin, 6 parts of low-molecular-weight epoxy resin, 3 parts of epoxy resin modifier, 0.6 part of modified hydrogenated castor oil, 1.2 parts of DISPARLON 6650, 4 parts of titanium dioxide, 11 parts of aluminum clay, 15 parts of talcum powder, 5 parts of quartz powder, 20 parts of precipitated barium sulfate, 2 parts of epoxy diluent, 0.4 part of silane coupling agent and 0.2 part of defoaming agent; in the component B, 12 parts of benzyl alcohol, 20 parts of xylene, 4.5 parts of propylene glycol, 16 parts of m-xylylenediamine, 20 parts of bisphenol F epoxy resin, 15 parts of polyoxypropylene triamine and 3.1 parts of a curing accelerator DMP-30, and the rest raw materials and preparation steps are the same as those in example 1 and are not repeated.

Example 4

The embodiment provides a seawater-resistant epoxy coating, which is different from embodiment 1 in that component A comprises 3.5 parts of dimethylbenzene, 3.5 parts of isobutanol, 23 parts of bisphenol A epoxy resin, 5 parts of low-molecular-weight epoxy resin, 3.5 parts of epoxy resin modifier, 2.5 parts of C9 petroleum resin, 7 parts of titanium dioxide, 8 parts of aluminum clay, 18 parts of talcum powder, 8.5 parts of quartz powder, 19.8 parts of precipitated barium sulfate, 1.8 parts of epoxy diluent, 0.28 part of silane coupling agent and 0.35 part of defoaming agent; in the component B, 10 parts of benzyl alcohol, 23 parts of xylene, 5 parts of propylene glycol, 15 parts of m-xylylenediamine, 20 parts of bisphenol F epoxy resin, 18.8 parts of polyoxypropylene triamine and 2.8 parts of a curing accelerator DMP-30, and the rest raw materials and preparation steps are the same as those in example 1 and are not repeated.

Example 5

The embodiment provides a seawater-resistant epoxy coating, which is different from embodiment 1 in that component A comprises 6 parts of dimethylbenzene, 1.5 parts of isobutanol, 25 parts of bisphenol A epoxy resin, 3 parts of low-molecular-weight epoxy resin, 4.5 parts of epoxy resin modifier, 2.5 parts of C9 petroleum resin, 7 parts of titanium dioxide, 8 parts of aluminum clay, 14 parts of talcum powder, 8.5 parts of quartz powder, 17.5 parts of precipitated barium sulfate, 2.6 parts of epoxy diluent, 0.5 part of silane coupling agent and 0.2 part of defoaming agent; in the component B, 11.5 parts of benzyl alcohol, 20 parts of xylene, 3.5 parts of propylene glycol, 18 parts of m-xylylenediamine, 21 parts of bisphenol F type epoxy resin, 15 parts of polyoxypropylene triamine and 3.3 parts of a curing accelerator DMP-30, and the rest raw materials and preparation steps are the same as those in example 1 and are not repeated.

Example 6

The embodiment provides a seawater-resistant epoxy coating, which is different from embodiment 1 in that in the component A, 21.5 parts of bisphenol A epoxy resin, 4.5 parts of low-molecular-weight epoxy resin, 3.5 parts of epoxy resin modifier, 0.3 part of modified hydrogenated castor oil, 1.5 parts of DISPARLON 6650, 5.5 parts of titanium dioxide, 10 parts of aluminum clay, 16.5 parts of talcum powder, 5 parts of quartz powder, 18.5 parts of precipitated barium sulfate, 2.2 parts of epoxy diluent, 0.3 part of silane coupling agent and 0.3 part of defoaming agent are used; in the component B, 12 parts of benzyl alcohol, 20 parts of xylene, 4.5 parts of propylene glycol, 16 parts of m-xylylenediamine, 20 parts of bisphenol F epoxy resin, 15 parts of polyoxypropylene triamine and 3.1 parts of a curing accelerator DMP-30, and the rest raw materials and preparation steps are the same as those in example 1 and are not repeated.

Example 7

The embodiment provides a seawater-resistant epoxy coating, which is different from the embodiment 1 in that the component A comprises 20 parts of bisphenol A epoxy resin, 5 parts of low-molecular-weight epoxy resin, 4 parts of epoxy resin modifier, 0.5 part of modified hydrogenated castor oil, 1.3 parts of DISPARLON 6650, 5 parts of titanium dioxide, 10.5 parts of aluminum clay, 15 parts of talcum powder, 5 parts of quartz powder, 19 parts of precipitated barium sulfate, 1.8 parts of epoxy diluent, 0.3 part of silane coupling agent and 0.2.5 parts of defoaming agent; in the component B, 12 parts of benzyl alcohol, 20 parts of xylene, 4.5 parts of propylene glycol, 16 parts of m-xylylenediamine, 20 parts of bisphenol F epoxy resin, 15 parts of polyoxypropylene triamine and 3.1 parts of a curing accelerator DMP-30, and the rest raw materials and preparation steps are the same as those in example 1 and are not repeated.

Example 8

The embodiment provides a seawater-resistant epoxy coating, which is different from the embodiment 1 in that the component A comprises 22 parts of bisphenol A epoxy resin, 4 parts of low-molecular-weight epoxy resin, 4 parts of epoxy resin modifier, 0.5 part of modified hydrogenated castor oil, 1.3 parts of DISPARLON 6650, 6 parts of titanium dioxide, 9 parts of aluminum clay, 14 parts of talcum powder, 9.5 parts of quartz powder, 18.5 parts of precipitated barium sulfate, 2 parts of epoxy diluent, 0.28 part of silane coupling agent and 0.32 part of defoaming agent; in the component B, 12 parts of benzyl alcohol, 20 parts of xylene, 4.5 parts of propylene glycol, 16 parts of m-xylylenediamine, 20 parts of bisphenol F epoxy resin, 15 parts of polyoxypropylene triamine and 3.1 parts of a curing accelerator DMP-30, and the rest raw materials and preparation steps are the same as those in example 1 and are not repeated.

Comparative example 1

This comparative example provides a seawater-resistant epoxy coating, which is different from example 1 in that the low-molecular-weight epoxy resin and the C9 petroleum resin are not contained in the component A, and the rest of the raw materials and the preparation steps are the same as those in example 1, and are not described again.

Comparative example 2

This comparative example provides a seawater-resistant epoxy coating, which is different from example 1 in that bisphenol a type epoxy resin and C9 petroleum resin are not included in component a, and the remaining raw materials and preparation steps are the same as those in example 1, and are not described again.

Comparative example 3

The comparative example provides a seawater-resistant epoxy coating, which is different from the example 1 in that the epoxy resin modifier is not contained in the component A, and the rest raw materials and the preparation steps are the same as those in the example 1 and are not repeated.

Comparative example 4

This comparative example provides a seawater-resistant epoxy coating, which is different from example 1 in that m-xylylenediamine is not present in component B, and the remaining raw materials and preparation steps are the same as those in example 1 and are not described herein again.

Comparative example 5

This comparative example provides a seawater-resistant epoxy coating, which is different from example 1 in that the component B does not contain polyoxypropylene triamine and bisphenol F epoxy resin, and the rest of the raw materials and the preparation steps are the same as those in example 1, and are not repeated herein.

Test example 1

The properties of the seawater-resistant epoxy coatings obtained in examples 1 to 10 and comparative examples 1 to 5 were measured by the following procedures and methods.

The test piece preparation and test method comprises the following steps: according to the method of GB/T1727-1992.

(1) Solid content test: the method is carried out according to the GB/T1725-2007 method.

(2) And (3) anti-sagging performance test: the method is carried out according to the method of GB 9264-88.

(3) And (3) wear resistance test: the method is carried out according to the GB/T1768 method.

(4) And (3) testing the adhesive force: the test is carried out according to ISO4624 or ASTM4541 standard, an AT-A automatic drawing instrument is used as an instrument, an iron plate is manufactured and sand-blasted, the film thickness is 150 micrometers, and the test is carried out after the natural drying is carried out for 24 hours.

(5) Salt spray resistance test: the method is carried out according to GB/T1771.

(6) And (3) testing water resistance: the method is carried out according to the GB/T1733 method.

(7) Weather resistance test: the method is carried out according to the GB/T9274 method.

The results are shown in Table 2.

TABLE 2 seawater resistant epoxy paint Performance data sheet

As can be seen from Table 2, the wear resistance, adhesion, salt spray resistance and water resistance of the examples 1 to 8 are better, the comprehensive performance is better than that of the comparative examples 1 to 5, and the paint can be applied to seawater resistant environment.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.