A solvent-free epoxy coal tar anticorrosive coating and a preparation method thereof

Abstract

The application discloses a solvent-free epoxy coal tar anticorrosive paint and a preparation method thereof. The paint comprises component A and component B. The component A comprises the following components: 1 part by weight of bisphenol A type epoxy resin with an epoxy equivalent of 180-190 g / eq, and 0.3-0.4 parts by weight of bisphenol A type epoxy resin with an epoxy equivalent of 200-240 g / eq. The component B comprises the following components: 1 part by weight of cashew phenol oil modified phenolic amine, 0.1-0.3 parts by weight of cashew nut shell oil modified alicyclic amine, and 0.3-0.5 parts by weight of modified phenolic amine. The paint has a service life of 1.5 h at room temperature and a service life of 1 h at 50 DEG C, solves the problem of explosive polymerization of the solvent-free epoxy coal tar paint when the gun is temporarily stopped during spraying, does not need to flush the pipeline with a diluent during hoisting and piping during the spraying process, improves construction efficiency, and reduces cost. The paint has low-temperature (5 DEG C) curing performance, has good drying performance during winter construction, has a coating salt water resistance of more than 3000 h, and has a chlorine ion penetration resistance of less than 1.0*10 ‑3 mg / (cm 3 d). The application discloses a solvent-free epoxy coal tar anticorrosive paint and a preparation method thereof. The paint comprises component A and component B. The component A comprises the following components: 1 part by weight of bisphenol A type epoxy resin with an epoxy equivalent of 180-190 g / eq, and 0.3-0.4 parts by weight of bisphenol A type epoxy resin with an epoxy equivalent of 200-240 g / eq. The component B comprises the following components: 1 part by weight of cashew phenol oil modified phenolic amine, 0.1-0.3 parts by weight of cashew nut shell oil modified alicyclic amine, and 0.3-0.5 parts by weight of modified phenolic amine. The paint has a service life of 1.5 h at room temperature and a service life of 1 h at 50 DEG C, solves the problem of explosive polymerization of the solvent-free epoxy coal tar paint when the gun is temporarily stopped during spraying, does not need to flush the pipeline with a diluent during hoisting and piping during the spraying process, improves construction efficiency, and reduces cost. The paint has low-temperature (5 DEG C) curing performance, has good drying performance during winter construction, has a coating salt water resistance of more than 3000 h, and has a chlorine ion penetration resistance of less than 1.0*10

Description

TECHNICAL FIELD

[0001] The present application relates to the field of anticorrosive coating, in particular to a solvent-free epoxy coal tar anticorrosive coating and a preparation method thereof. BACKGROUND

[0002] With the continuous improvement of people's living standards, the state increases the infrastructure construction, among which the water conservancy diversion construction investment is increasing year by year. In large water conservancy diversion projects, prestressed steel cylinder concrete pipe (PCCP for short) is often used as the main pipeline. This pipeline is a composite pipe that combines the tensile and impermeable advantages of steel and the compressive and corrosion-resistant advantages of concrete. The main process of PCCP production is to precast a steel cylinder, pour concrete in or outside the steel cylinder to form a pipe core, after steam curing of the pipe core, wrap prestressed steel wire on the outer wall, then roll the mortar layer on the outer wall, and after the mortar layer is dry, spray the outer wall with solvent-free epoxy coal tar anticorrosive coating

[0003] As a PCCP anticorrosive coating, the solvent-free epoxy coal tar anticorrosive coating has a short applicable period in engineering applications. When spraying is completed on one section of the pipe, the spraying pipeline needs to be cleaned with a diluent under the condition of stopping the gun, otherwise the spraying pipeline will be blocked, causing equipment damage. At the same time, the real drying time is greatly prolonged at -5°C, and the coating cannot be completely cured, affecting the construction progress in winter and the performance of the coating. SUMMARY

[0004] The present application provides a solvent-free epoxy coal tar anticorrosive coating and a preparation method thereof, which can simultaneously have long applicable period at high temperature and low-temperature curability.

[0005] The present application adopts the following technical solutions:

[0006] The present application provides a solvent-free epoxy coal tar anticorrosive coating, which comprises component A and component B, and the weight ratio of component A to component B is 1:0.9-1.1.

[0007] Component A comprises the following components:

[0008] 1 part by weight of bisphenol A type epoxy resin with an epoxy equivalent of 180-190 g / eq

[0009] 0.3-0.4 parts by weight of bisphenol A type epoxy resin with an epoxy equivalent of 200-240 g / eq

[0010] 0.3-0.4 parts by weight of medium-temperature liquid asphalt

[0011] 0.8-1.0 parts by weight of 1000-mesh talc powder

[0012] 0.3-0.4 parts by weight of 1000-mesh barite powder

[0013] 800 mesh mica 0.2 to 0.3 parts by weight

[0014] fumed silica 0.01 to 0.03 parts by weight

[0015] organobentonite 0.01 to 0.03 parts by weight

[0016] carbon black 0.1 to 0.3 parts by weight

[0017] silane coupling agent 0.005 to 0.008 parts by weight

[0018] antifoaming agent 0.004 to 0.007 parts by weight

[0019] leveling agent 0.005 to 0.008 parts by weight

[0020] hindered phenol antioxidant 0.005 to 0.008 parts by weight.

[0021] The B component includes the following components:

[0022] cardanol oil modified phenalkamine 1 part by weight

[0023] cardanol oil modified alicyclic amine 0.1 to 0.3 parts by weight

[0024] modified phenalkamine 0.3 to 0.5 parts by weight

[0025] medium temperature liquid pitch 0.3 to 0.5 parts by weight

[0026] 1000 mesh quartz powder 0.8 to 1.2 parts by weight

[0027] 1000 mesh heavy calcium powder 0.4 to 0.6 parts by weight

[0028] 800 mesh mica 0.2 to 0.4 parts by weight

[0029] carbon black 0.1 to 0.3 parts by weight

[0030] fumed silica 0.01 to 0.03 parts by weight

[0031] organobentonite 0.01 to 0.03 parts by weight

[0032] silane coupling agent 0.005 to 0.008 parts by weight

[0033] antifoaming agent 0.004 to 0.007 parts by weight

[0034] leveling agent 0.005 to 0.008 parts by weight

[0035] hindered phenol antioxidant 0.005 to 0.008 parts by weight.

[0036] Further, the weight ratio of the A component to the B component is 1:1.

[0037] Further, the A component includes the following components:

[0038] bisphenol A type epoxy resin having an epoxy equivalent of 180 to 190 g / eq 1 part by weight

[0039] medium temperature liquid pitch 0.33 part by weight

[0040] 1000 mesh talc 0.83 part by weight

[0041] 1000 mesh barite powder 0.33 part by weight

[0042] 800 mesh mica 0.2 part by weight

[0043] fumed silica 0.01 part by weight

[0044] organic bentonite 0.01 part by weight

[0045] carbon black 0.17 part by weight

[0046] silane coupling agent 0.006 part by weight

[0047] defoaming agent 0.005 part by weight

[0048] leveling agent 0.006 part by weight

[0049] hindered phenol-based antioxidant 0.006 part by weight.

[0050] Further, the B component includes the following components:

[0051] cardanol oil-modified phenalkamine 1 part by weight

[0052] cashew nut shell oil-modified alicyclic amine 0.2 part by weight

[0053] modified phenalkamine 0.4 part by weight

[0054] medium temperature liquid pitch 0.4 part by weight

[0055] 1000 mesh quartz powder 1 part by weight

[0056] 1000 mesh heavy calcium powder 0.5 part by weight

[0057] 800 mesh mica 0.3 part by weight

[0058] carbon black 0.2 part by weight

[0059] fumed silica 0.01 part by weight

[0060] Organobentonite 0.01 parts by weight

[0061] Silane coupling agent 0.006 parts by weight

[0062] Defoaming agent 0.005 parts by weight

[0063] Leveling agent 0.006 parts by weight

[0064] Hindered phenolic antioxidant 0.006 parts by weight.

[0065] The application also provides a preparation method of the above-mentioned solvent-free epoxy coal tar anticorrosive coating, comprising the following steps:

[0066] The bisphenol A type epoxy resin with an epoxy equivalent of 180-190 g / eq, the bisphenol A type epoxy resin with an epoxy equivalent of 200-240 g / eq, benzyl alcohol, medium-temperature liquid pitch, a silane coupling agent, a defoaming agent, a leveling agent, a hindered phenolic antioxidant, 1000-mesh talc powder, 1000-mesh barite powder, 800-mesh mica powder, carbon black, fumed silica and organobentonite are added into a tank and uniformly mixed to obtain a first mixture.

[0067] The first mixture is ground by a grinder to obtain component A.

[0068] The cardanol oil modified phenolic amine, the cashew nut shell oil modified alicyclic amine, the modified phenolic amine, the medium-temperature liquid pitch, the silane coupling agent, the defoaming agent, the leveling agent, the hindered phenolic antioxidant, 1000-mesh heavy calcium powder, 1000-mesh quartz powder, 800-mesh mica powder, carbon black, fumed silica and organobentonite are added into a tank and uniformly mixed to obtain a second mixture.

[0069] The second mixture is ground by a grinder to obtain component B.

[0070] The component A and the component B are uniformly mixed to obtain the solvent-free epoxy coal tar anticorrosive coating.

[0071] Further, the bisphenol A type epoxy resin with an epoxy equivalent of 180-190 g / eq, the bisphenol A type epoxy resin with an epoxy equivalent of 200-240 g / eq, benzyl alcohol, medium-temperature liquid pitch, a silane coupling agent, a defoaming agent, a leveling agent, a hindered phenolic antioxidant, 1000-mesh talc powder, 1000-mesh barite powder, 800-mesh mica powder, carbon black, fumed silica and organobentonite are added into a tank, comprising:

[0072] A cashew phenol oil modified phenolic amine, a cashew nutshell oil modified cycloaliphatic amine, a modified phenolic amine, a medium temperature liquid pitch, a silane coupling agent, a defoaming agent, a leveling agent, a hindered phenolic antioxidant, 1000 mesh heavy calcium powder, 1000 mesh quartz powder, 800 mesh mica powder, carbon black, fumed silica, and organic bentonite are added to a tank, and 1000 mesh talc powder, 1000 mesh barite powder, 800 mesh mica powder, carbon black, fumed silica, and organic bentonite are added under stirring.

[0073] A cashew phenol oil modified phenolic amine, a cashew nutshell oil modified cycloaliphatic amine, a modified phenolic amine, a medium temperature liquid pitch, a silane coupling agent, a defoaming agent, a leveling agent, a hindered phenolic antioxidant, 1000 mesh heavy calcium powder, 1000 mesh quartz powder, 800 mesh mica powder, carbon black, fumed silica, and organic bentonite are added to a tank, and 1000 mesh talc powder, 1000 mesh barite powder, 800 mesh mica powder, carbon black, fumed silica, and organic bentonite are added under stirring.

[0074] A cashew phenol oil modified phenolic amine, a cashew nutshell oil modified cycloaliphatic amine, a modified phenolic amine, a medium temperature liquid pitch, a silane coupling agent, a defoaming agent, a leveling agent, a hindered phenolic antioxidant, 1000 mesh heavy calcium powder, 1000 mesh quartz powder, 800 mesh mica powder, carbon black, fumed silica, and organic bentonite are added to a tank, and 1000 mesh talc powder, 1000 mesh barite powder, 800 mesh mica powder, carbon black, fumed silica, and organic bentonite are added under stirring.

[0075] Further, a bisphenol A type epoxy resin with an epoxy equivalent weight of 180-190 g / eq, a bisphenol A type epoxy resin with an epoxy equivalent weight of 200-240 g / eq, benzyl alcohol, a medium temperature liquid pitch, a silane coupling agent, a defoaming agent, a leveling agent, a hindered phenolic antioxidant, 1000 mesh talc powder, 1000 mesh barite powder, 800 mesh mica powder, carbon black, fumed silica, and organic bentonite are added to a tank and mixed uniformly to obtain a first mixture, including:

[0076] A bisphenol A type epoxy resin with an epoxy equivalent weight of 180-190 g / eq, a bisphenol A type epoxy resin with an epoxy equivalent weight of 200-240 g / eq, benzyl alcohol, a medium temperature liquid pitch, a silane coupling agent, a defoaming agent, a leveling agent, a hindered phenolic antioxidant are added to a tank, and 1000 mesh talc powder, 1000 mesh barite powder, 800 mesh mica powder, carbon black, fumed silica, and organic bentonite are added at a stirring speed of 1500-2500 rpm, and stirring is continued for 30-40 min to obtain a first mixture.

[0077] Further, the first mixture is ground by a grinder to a fineness of solids in the first mixture of 90 μm or less.

[0078] Further, cashew phenol oil modified phenolic amine, cashew nut shell oil modified alicyclic amine, modified phenolic amine, medium temperature liquid pitch, silane coupling agent, defoaming agent, leveling agent, hindered phenolic antioxidant, 1000 mesh heavy calcium powder, 1000 mesh quartz powder, 800 mesh mica powder, carbon black, fumed silica, organic bentonite are added into the tank, and mixed uniformly to obtain a second mixture, comprising:

[0079] The cashew phenol oil modified phenolic amine, cashew nut shell oil modified alicyclic amine, modified phenolic amine, medium temperature liquid pitch, silane coupling agent, defoaming agent, leveling agent, hindered phenolic antioxidant are added into the tank, and 1000 mesh heavy calcium powder, 1000 mesh quartz powder, 800 mesh mica powder, carbon black, fumed silica, organic bentonite are added at a stirring speed of 1500-2500 rpm, and stirring is continued for 30-40 min to obtain a second mixture.

[0080] Further, the second mixture is ground by a grinder to a fineness of the solids in the second mixture of 90 μm or less.

[0081] Compared with the prior art, the present application has the following beneficial effects:

[0082] (1) In the solvent-free epoxy coal tar pitch anticorrosion coating of the present application, cashew phenol modified phenolic amine and cashew nut shell oil modified alicyclic amine have unique properties due to their unique structure. Such amines have low-temperature curing and long operation period, which can extend the pot life of solvent-free coatings and prolong the operation time. They are also suitable for use under low temperature conditions. The introduction of modified phenolic amine enables the coating to achieve a dry effect after 24 h. The introduction of silane coupling agent can increase the adhesion of the coating on concrete and steel, increase the density of the coating, and improve the adhesion and salt water resistance and chloride ion resistance of the coating.

[0083] (2) The solvent-free epoxy coal tar pitch anticorrosion coating of the present application has a pot life of 1.5 h at room temperature and 1 h at 50℃, solving the problem of explosive polymerization of solvent-free epoxy coal tar pitch coatings when the gun is temporarily stopped during spraying. During the spraying process, there is no need to flush the pipeline with a diluent during hoisting, which improves the construction efficiency and reduces the cost.

[0084] (3) The solvent-free epoxy coal tar pitch anticorrosion coating of the present application has low-temperature (-5℃) curing performance and good drying performance in winter construction. The coating has a salt water resistance of more than 3000 h and a chloride ion permeability of <1.0 x 10 -3 mg / (cm 3 d). In addition, all the performances meet the requirements of the national standard GB / T35490-2017 "Prestressed Steel Cylinder Concrete Pipe Corrosion Resistance Technology". DETAILED DESCRIPTION

[0085] The technical methods in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative labor fall within the protection scope of the present application.

[0086] The present application provides a solvent-free epoxy coal tar anticorrosive coating, which comprises component A and component B, and the weight ratio of component A to component B is 1:0.9-1.1, such as 1:0.9, 1:1, 1:1.1. Preferably, the weight ratio of component A to component B is 1:1.

[0087] Component A comprises the following components: 1 part by weight of bisphenol A type epoxy resin with an epoxy equivalent weight of 180-190 g / eq, 0.3-0.4 parts by weight (such as 0.3, 0.33, 0.37, 0.4 parts by weight) of bisphenol A type epoxy resin with an epoxy equivalent weight of 200-240 g / eq, 0.06-0.08 parts by weight (such as 0.06, 0.07, 0.08 parts by weight) of benzyl alcohol, 0.3-0.4 parts by weight (such as 0.3, 0.33, 0.37, 0.4 parts by weight) of medium-temperature liquid asphalt, 0.8-1.0 parts by weight (such as 0.8, 0.83, 0.9, 0.97, 1 part by weight) of 1000-mesh talc powder, 0.3-0.4 parts by weight (such as 0.3, 0.33, 0.37, 0.4 parts by weight) of 1000-mesh barite powder, 0.2-0.3 parts by weight (such as 0.2, 0.25, 0.3 parts by weight) of 800-mesh mica, 0.01-0.03 parts by weight (such as 0.01, 0.02, 0.03 parts by weight) of fumed silica, 0.01-0.03 parts by weight (such as 0.01, 0.02, 0.03 parts by weight) of organic bentonite, 0.1-0.3 parts by weight (such as 0.1, 0.17, 0.23, 0.3 parts by weight) of carbon black, 0.005-0.008 parts by weight (such as 0.005, 0.006, 0.007, 0.008 parts by weight) of silane coupling agent, 0.004-0.007 parts by weight (such as 0.004, 0.005, 0.006, 0.007 parts by weight) of defoaming agent, 0.005-0.008 parts by weight (such as 0.005, 0.006, 0.007, 0.008 parts by weight) of leveling agent, and 0.005-0.008 parts by weight (such as 0.005, 0.006, 0.007, 0.008 parts by weight) of hindered phenolic antioxidant.

[0088] Preferably, the A component comprises the following components: 1 part by weight of a bisphenol A type epoxy resin having an epoxy equivalent of 180 to 190 g / eq, 0.33 parts by weight of a bisphenol A type epoxy resin having an epoxy equivalent of 200 to 240 g / eq, 0.06 parts by weight of benzyl alcohol, 0.33 parts by weight of a medium temperature liquid pitch, 0.83 parts by weight of 1000 mesh talc powder, 0.33 parts by weight of 1000 mesh barite powder, 0.2 parts by weight of 800 mesh mica, 0.01 parts by weight of fumed silica, 0.01 parts by weight of organic bentonite, 0.17 parts by weight of carbon black, 0.006 parts by weight of a silane coupling agent, 0.005 parts by weight of a defoaming agent, 0.006 parts by weight of a leveling agent, and 0.006 parts by weight of a hindered phenol antioxidant.

[0089] The B component comprises the following components: 1 part by weight of a cardanol oil modified phenolic amine, 0.1 to 0.3 parts by weight (such as 0.1, 0.2, 0.3 parts by weight) of a cashew nut shell oil modified alicyclic amine, 0.3 to 0.5 parts by weight (such as 0.3, 0.4, 0.5 parts by weight) of a modified phenolic amine, 0.3 to 0.5 parts by weight (such as 0.3, 0.4, 0.5 parts by weight) of a medium temperature liquid pitch, 0.8 to 1.2 parts by weight (such as 0.8, 1, 1.2 parts by weight) of 1000 mesh quartz powder, 0.4 to 0.6 parts by weight (such as 0.4, 0.5, 0.6 parts by weight) of 1000 mesh heavy calcium powder, 0.2 to 0.4 parts by weight (such as 0.2, 0.3, 0.4 parts by weight) of 800 mesh mica, 0.1 to 0.3 parts by weight (such as 0.1, 0.2, 0.3 parts by weight) of carbon black, 0.01 to 0.03 parts by weight (such as 0.01, 0.02, 0.03 parts by weight) of fumed silica, 0.01 to 0.03 parts by weight (such as 0.01, 0.02, 0.03 parts by weight) of organic bentonite, 0.005 to 0.008 parts by weight (such as 0.005, 0.006, 0.007, 0.008 parts by weight) of a silane coupling agent, 0.004 to 0.007 parts by weight (such as 0.004, 0.005, 0.006, 0.007 parts by weight) of a defoaming agent, 0.005 to 0.008 parts by weight (such as 0.005, 0.006, 0.007, 0.008 parts by weight) of a leveling agent, and 0.005 to 0.008 parts by weight (such as 0.005, 0.006, 0.007, 0.008 parts by weight) of a hindered phenol antioxidant.

[0090] Further, the B component includes the following components: cashew phenol oil modified phenolic amine 1 part by weight, cashew nut shell oil modified alicyclic amine 0.2 parts by weight, modified phenolic amine 0.4 parts by weight, medium temperature liquid asphalt 0.4 parts by weight, 1000 mesh quartz powder 1 part by weight, 1000 mesh heavy calcium powder 0.5 parts by weight, 800 mesh mica 0.3 parts by weight, carbon black 0.2 parts by weight, fumed silica 0.01 parts by weight, organic bentonite 0.01 parts by weight, silane coupling agent 0.006 parts by weight, defoaming agent 0.005 parts by weight, leveling agent 0.006 parts by weight, hindered phenolic antioxidant 0.006 parts by weight.

[0091] The ternary curing agent used in the solvent-free epoxy coal tar pitch anticorrosive coating of the present application is cashew phenol modified phenolic amine, cashew nut shell oil modified alicyclic amine and modified phenolic amine. Cashew phenol modified phenolic amine and cashew nut shell oil modified alicyclic amine have unique properties due to their unique structure. Such amines have low-temperature fast curing and longer operation period, which can extend the pot life of the solvent-free coating and extend the operation time, and are also suitable for use under low temperature conditions. In addition, the introduction of modified phenolic amine enables the coating to achieve a real dry effect after 24 hours.

[0092] The improvement of the present application compared with the prior art also includes the use of two different bisphenol A type epoxy resins with different epoxy equivalent weights (epoxy equivalent weight: the number of grams of epoxy resin per equivalent of epoxy group, i.e. the average molecular weight of the epoxy resin divided by the number of epoxy groups contained in each molecule), i.e. epoxy resins with epoxy equivalent weights of 200-240 g / eq and 180-190 g / eq. The two epoxy resins in the solvent-free epoxy coal tar pitch anticorrosive coating of the present application have different effects. The bisphenol A type epoxy resin with an epoxy equivalent weight of 180-190 g / eq mainly improves the permeation resistance and salt spray resistance of the coating. The bisphenol A type epoxy resin with an epoxy equivalent weight of 200-240 g / eq mainly improves the flexibility of the coating.

[0093] In addition, other auxiliary components in the solvent-free epoxy coal tar pitch anticorrosive coating of the present application, such as silane coupling agent, antioxidant, defoaming agent, leveling agent, organic bentonite and fumed silica, also have different effects.

[0094] The active groups contained in the silane coupling agent can couple organic polymers and inorganic fillers, and form a molecular bridge between the coating and the steel substrate through chemical or physical action, thereby improving the adhesion of the coating to the substrate. Therefore, the introduction of silane coupling agent can increase the adhesion of the coating to concrete and steel, increase the density of the coating, and improve the adhesion, salt water resistance and chloride ion resistance of the coating.

[0095] The antioxidant can effectively prevent the yellowing problem of the coating when exposed to the open air for a short period of time, and improve the color retention of the coating.

[0096] The defoaming agent can effectively eliminate the defoaming of the paint, and solve the problem of high thixotropy and stable bubble of the paint with high viscosity.

[0097] The leveling agent can make the coating more flat, and solve the brush marks formed by high thixotropy of the paint.

[0098] The organic bentonite and fumed silica mainly play the role of anti-settling agent. Because the non-volatile content in the paint is greater than 95%, the content is high, and precipitation is very easy to occur, so an anti-settling agent is added to the system, and the organic bentonite and fumed silica are mixed for use, which has a very good anti-settling effect.

[0099] The weight ratio of each component in the solvent-free epoxy coal tar anticorrosive coating of the present application is designed according to the functions of the above components, so that the properties of the finally obtained solvent-free epoxy coal tar anticorrosive coating meet the requirements of the national standard GB / T 35490-2017 “Prestressed Concrete Cylinder Pipe Corrosion Resistance Technology”.

[0100] The pot life of the solvent-free epoxy coal tar anticorrosive coating of the present application at room temperature can reach 1.5h, and the pot life at 50℃ can reach 1h, which solves the problem of explosive polymerization of the solvent-free epoxy coal tar coating when the gun is temporarily stopped during spraying. During the spraying process, the pipeline does not need to be flushed with a diluent during hoisting, which improves the construction efficiency and reduces the cost. The solvent-free epoxy coal tar anticorrosive coating of the present application has low temperature (-5℃) curing performance, and has good drying performance in winter construction. The salt water resistance of the coating is more than 3000h, and the chloride ion penetration resistance is less than 1.0x10 -3 mg / (cm 3 d).

[0101] The solvent-free epoxy coal tar anticorrosive coating of the present application can be used for the corrosion protection of PCCP, water pressure steel pipe, marine steel structure, bridge, pipeline and petrochemical steel structure, etc.

[0102] The present application also provides a preparation method of the above-mentioned solvent-free epoxy coal tar anticorrosive coating, which comprises the following steps:

[0103] Step (1), the bisphenol A type epoxy resin with an epoxy equivalent of 180-190g / eq, the bisphenol A type epoxy resin with an epoxy equivalent of 200-240g / eq, benzyl alcohol, medium temperature liquid asphalt, silane coupling agent, defoaming agent, leveling agent, hindered phenolic antioxidant, 1000 mesh talc powder, 1000 mesh barite powder, 800 mesh mica powder, carbon black, fumed silica, and organic bentonite are added to a tank and uniformly mixed to obtain a first mixture.

[0104] In the above step, the bisphenol A type epoxy resin with an epoxy equivalent of 180-190 g / eq, the bisphenol A type epoxy resin with an epoxy equivalent of 200-240 g / eq, benzyl alcohol, medium temperature liquid pitch, silane coupling agent, defoaming agent, leveling agent, hindered phenolic antioxidant are added to the tank, and 1000 mesh talc powder, 1000 mesh barite powder, 800 mesh mica powder, carbon black, fumed silica, organic bentonite are added under stirring.

[0105] In the above step, the bisphenol A type epoxy resin with an epoxy equivalent of 180-190 g / eq, the bisphenol A type epoxy resin with an epoxy equivalent of 200-240 g / eq, benzyl alcohol, medium temperature liquid pitch, silane coupling agent, defoaming agent, leveling agent, hindered phenolic antioxidant are added to the tank, and 1000 mesh talc powder, 1000 mesh barite powder, 800 mesh mica powder, carbon black, fumed silica, organic bentonite are added under stirring.

[0106] Step (2), the first mixture is ground with a grinder to obtain component A.

[0107] In the above step, the first mixture is ground with a grinder for 0.5-1 hour to make the fineness of the solids in the first mixture reach below 90 μm.

[0108] Step (3), cashew phenol oil modified phenolic amine, cashew nut shell oil modified alicyclic amine, modified phenolic amine, medium temperature liquid pitch, silane coupling agent, defoaming agent, leveling agent, hindered phenolic antioxidant, 1000 mesh heavy calcium powder, 1000 mesh quartz powder, 800 mesh mica powder, carbon black, fumed silica, organic bentonite are added to the tank, and mixed uniformly to obtain a second mixture.

[0109] In the above step, the cashew phenol oil modified phenolic amine, cashew nut shell oil modified alicyclic amine, modified phenolic amine, medium temperature liquid pitch, silane coupling agent, defoaming agent, leveling agent, hindered phenolic antioxidant are added to the tank, and 1000 mesh heavy calcium powder, 1000 mesh quartz powder, 800 mesh mica powder, carbon black, fumed silica, organic bentonite are added under stirring.

[0110] In the above step, the cashew phenol oil modified phenolic amine, cashew shell oil modified alicyclic amine, modified phenolic amine, medium temperature liquid pitch, silane coupling agent, defoaming agent, leveling agent, hindered phenolic antioxidant are added into the tank, 1000 mesh heavy calcium powder, 1000 mesh quartz powder, 800 mesh mica powder, carbon black, fumed silica, organic bentonite are added at a stirring speed of 1500-2500 rpm (such as 1500, 2000, 2500 rpm), and the stirring is continued for 30-40 min (such as 30, 35, 40 min) to obtain a second mixture.

[0111] Step (4), the second mixture is ground with a grinder to obtain component B.

[0112] In the above step, the second mixture is ground with a grinder for 0.5-1 hour to make the fineness of the solids in the second mixture reach below 90 μm.

[0113] Step (5), the component A and the component B are mixed uniformly to obtain the solvent-free epoxy coal tar pitch anticorrosive coating.

[0114] Before using the solvent-free epoxy coal tar pitch anticorrosive coating of the present application, the component A and the component B are mixed.

[0115] The technical solutions of the present application are described in detail below in combination with specific examples:

[0116] In the following examples, the types of the main components are as follows:

[0117] Fumed silica, R972, Tianjin Ronggang Xingye Chemical Co., Ltd.;

[0118] Organic bentonite, BS-1C, Zhejiang Fenghong New Materials Co., Ltd.;

[0119] Silane coupling agent, KH550, Nanjing Shuguang Chemical Factory;

[0120] Defoaming agent, BYK-141, BYK Chemical;

[0121] Leveling agent, BYK-, 310, BYK Chemical

[0122] Hindered phenolic antioxidant, antioxidant 1010, BASF.

[0123] Example 1 (100 g per weight part)

[0124] Step (1), 1 part by weight of bisphenol A type epoxy resin with an epoxy equivalent weight of 180-190 g / eq, 0.3 parts by weight of bisphenol A type epoxy resin with an epoxy equivalent weight of 200-240 g / eq, 0.06 parts by weight of benzyl alcohol, 0.3 parts by weight of medium temperature liquid asphalt, 0.005 parts by weight of silane coupling agent, 0.004 parts by weight of defoaming agent, 0.005 parts by weight of leveling agent, 0.005 parts by weight of hindered phenolic antioxidant are added to the tank, 0.8 parts by weight of 1000 mesh talc, 0.3 parts by weight of 1000 mesh barite powder, 0.2 parts by weight of 800 mesh mica powder, 0.1 parts by weight of carbon black, 0.01 parts by weight of fumed silica, 0.01 parts by weight of organic bentonite are added at room temperature under the stirring speed of 1500-2500 rpm, continue to stir for 30-40 min, make the components disperse uniformly, get the first mixture.

[0125] Step (2), the first mixture is ground with a grinder for 0.5-1 hour, the fineness of the solids in the first mixture reaches below 90 μm, and the A component is obtained.

[0126] Step (3), 1 part by weight of cashew phenol oil modified phenolic amine, 0.1 part by weight of cashew nut shell oil modified alicyclic amine, 0.3 part by weight of modified phenolic amine, 0.3 part by weight of medium temperature liquid asphalt, 0.005 part by weight of silane coupling agent, 0.004 part by weight of defoaming agent, 0.005 part by weight of leveling agent, 0.005 part by weight of hindered phenolic antioxidant are added to the tank, 0.4 parts by weight of 1000 mesh heavy calcium powder, 0.8 parts by weight of 1000 mesh quartz powder, 0.2 parts by weight of 800 mesh mica powder, 0.1 parts by weight of carbon black, 0.01 parts by weight of fumed silica, 0.01 parts by weight of organic bentonite are added at room temperature under the stirring speed of 1500-2500 rpm, continue to stir for 30-40 min, make the components disperse uniformly, get the second mixture.

[0127] Step (4), the second mixture is ground with a grinder for 0.5-1 hour, the fineness of the solids in the second mixture reaches below 90 μm, and the B component is obtained.

[0128] Step (5), the A component and the B component are mixed uniformly at a weight ratio of 1:0.9, and the solvent-free epoxy coal tar pitch anticorrosive coating is prepared.

[0129] According to the national standard GB / T 35490-2017 "Prestressed Steel Cylinder Concrete Pipe Anticorrosion Technology" and related detection requirements, the properties of the solvent-free epoxy coal tar pitch anticorrosive coating obtained in this example are tested, among which the pot life and curing time at different temperatures are shown in Table 1, and the properties of the obtained primer and coating are shown in Table 2.

[0130] Table 1 Pot life and curing time of the solvent-free epoxy coal tar anticorrosive coating obtained in Example 1 at different temperatures

[0131]

[0132] Table 2 Properties of the solvent-free epoxy coal tar anticorrosive coating obtained in Example 1

[0133]

[0134] Example 2 (100 g per weight part)

[0135] Step (1), 1 weight part of bisphenol A type epoxy resin with an epoxy equivalent weight of 180-190 g / eq, 0.4 weight part of bisphenol A type epoxy resin with an epoxy equivalent weight of 200-240 g / eq, 0.08 weight part of benzyl alcohol, 0.4 weight part of medium temperature liquid pitch, 0.008 weight part of silane coupling agent, 0.007 weight part of defoaming agent, 0.008 weight part of leveling agent, and 0.008 weight part of hindered phenolic antioxidant were added into a tank, and 1.0 weight part of 1000 mesh talc powder, 0.4 weight part of 1000 mesh barite powder, 0.3 weight part of 800 mesh mica powder, 0.3 weight part of carbon black, 0.03 weight part of fumed silica, and 0.03 weight part of organic bentonite were added at a stirring speed of 1500-2500 rpm at room temperature. The mixture was continuously stirred for 30-40 min to uniformly disperse the components, obtaining a first mixture.

[0136] Step (2), the first mixture was ground by a grinder for 0.5-1 hour to obtain a solid fineness of 90 μm or less in the first mixture, obtaining component A.

[0137] Step (3), 1 weight part of cashew phenol oil modified phenolic amine, 0.3 weight part of cashew nut shell oil modified alicyclic amine, 0.5 weight part of modified phenolic amine, 0.5 weight part of medium temperature liquid pitch, 0.008 weight part of silane coupling agent, 0.007 weight part of defoaming agent, 0.008 weight part of leveling agent, and 0.008 weight part of hindered phenolic antioxidant were added into a tank, and 0.6 weight part of 1000 mesh heavy calcium powder, 1.2 weight part of 1000 mesh quartz powder, 0.4 weight part of 800 mesh mica powder, 0.3 weight part of carbon black, 0.03 weight part of fumed silica, and 0.03 weight part of organic bentonite were added at a stirring speed of 1500-2500 rpm at room temperature. The mixture was continuously stirred for 30-40 min to uniformly disperse the components, obtaining a second mixture.

[0138] Step (4), the second mixture was ground by a grinder for 0.5-1 hour to obtain a solid fineness of 90 μm or less in the second mixture, obtaining component B.

[0139] Step (5), the A component and the B component are mixed uniformly at a weight ratio of 1:1.1, namely, the solvent-free epoxy coal tar pitch anticorrosive coating is prepared.

[0140] According to the national standard GB / T 35490-2017 “Prestressed Steel Cylinder Concrete Pipe Anticorrosion Technology” and related detection requirements, the properties of the solvent-free epoxy coal tar pitch anticorrosive coating obtained in the example are tested, wherein the pot life and curing time at different temperatures are shown in Table 3, and the properties of the obtained primer and coating are shown in Table 4.

[0141] Table 3: Pot life and curing time of the solvent-free epoxy coal tar pitch anticorrosive coating obtained in Example 2 at different temperatures

[0142]

[0143] Table 4: Properties of the solvent-free epoxy coal tar pitch anticorrosive coating obtained in Example 2

[0144]

[0145]

[0146] As can be seen from Tables 1-4, the solvent-free epoxy coal tar pitch anticorrosive coating of the present application has a pot life of 1.5 h at room temperature, and a pot life of 1 h at 50°C, has a fast curing speed at low temperature, and is dry in 24 hours at -5°C, effectively shortening the construction period, improving the construction efficiency, and reducing the cost. The coating has no blistering, cracking or peeling after 3000 h of salt water resistance, and has a chloride ion penetration resistance of 6.5-7 x 10 -4 mg / (cm 3 d), which is also higher than the standard requirement.

[0147] The above shows and describes the basic principles, main features and advantages of the present application. It should be understood by those skilled in the art that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and the scope of protection of the present application is defined by the appended claims, the specification and their equivalents.

[0148] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present application and do not limit the scope of protection of the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the present application.

Claims

1. A solventless epoxy coal tar anticorrosive coating characterized by, comprising an A component and a B component, the weight ratio of the A component to the B component being 1:0.9-1.1; The A component comprises the following components: Bisphenol A type epoxy resin having an epoxy equivalent of 180-190 g / eq 1 part by weight Bisphenol A type epoxy resin having an epoxy equivalent of 200-240 g / eq 0.3-0.4 parts by weight Benzylic alcohol 0.06-0.08 parts by weight Medium temperature liquid pitch 0.3-0.4 parts by weight 1000 mesh talc powder 0.8-1.0 parts by weight 1000 mesh barite powder 0.3-0.4 parts by weight 800 mesh mica powder 0.2-0.3 parts by weight Fumed silica 0.01-0.03 parts by weight Organic bentonite 0.01-0.03 parts by weight Carbon black 0.1-0.3 parts by weight Silane coupling agent 0.005-0.008 parts by weight Defoaming agent 0.004-0.007 parts by weight Leveling agent 0.005-0.008 parts by weight Hindered phenolic antioxidant 0.005-0.008 parts by weight. The B component comprises the following components: Cashew phenol modified phenolic amine 1 part by weight Cashew nut shell oil modified alicyclic amine 0.1-0.3 parts by weight Modified phenolic amine 0.3-0.5 parts by weight Medium temperature liquid pitch 0.3-0.5 parts by weight 1000 mesh quartz powder 0.8-1.2 parts by weight 1000 mesh heavy calcium powder 0.4-0.6 parts by weight 800 mesh mica powder 0.2-0.4 parts by weight Carbon black 0.1-0.3 parts by weight Fumed silica 0.01-0.03 parts by weight Organic bentonite 0.01-0.03 parts by weight Silane coupling agent 0.005-0.008 parts by weight Defoaming agent 0.004-0.007 parts by weight Leveling agent 0.005-0.008 parts by weight Hindered phenolic antioxidant 0.005-0.008 parts by weight.

2. The solvent-free epoxy coal tar pitch anticorrosive paint according to claim 1, characterized in that, the weight ratio of the A component to the B component is 1:

1.

3. The solvent-free epoxy coal tar pitch anticorrosive paint according to claim 1, characterized in that, The A component comprises the following components: Bisphenol A type epoxy resin having an epoxy equivalent of 180-190 g / eq 1 part by weight Bisphenol A type epoxy resin having an epoxy equivalent of 200-240 g / eq 0.33 parts by weight Benzylic alcohol 0.06 parts by weight Medium temperature liquid pitch 0.33 parts by weight 1000 mesh talc powder 0.83 parts by weight 1000 mesh barite powder 0.33 parts by weight 800 mesh mica powder 0.2 parts by weight Fumed silica 0.01 parts by weight Organic bentonite 0.01 parts by weight Carbon black 0.17 parts by weight Silane coupling agent 0.006 parts by weight Defoaming agent 0.005 parts by weight Leveling agent 0.006 parts by weight Hindered phenolic antioxidant 0.006 parts by weight.

4. The solvent-free epoxy coal tar pitch anticorrosive paint according to claim 1, characterized in that, The B component comprises the following components: Cashew phenol modified phenolic amine 1 part by weight Cashew nut shell oil modified alicyclic amine 0.2 parts by weight Modified phenolic amine 0.4 parts by weight Medium temperature liquid pitch 0.4 parts by weight 1000 mesh quartz powder 1 parts by weight 1000 mesh heavy calcium powder 0.5 parts by weight 800 mesh mica powder 0.3 parts by weight Carbon black 0.2 parts by weight Fumed silica 0.01 parts by weight Organic bentonite 0.01 parts by weight Silane coupling agent 0.006 parts by weight Defoaming agent 0.005 parts by weight Leveling agent 0.006 parts by weight Hindered phenolic antioxidant 0.006 parts by weight.

5. A process for the preparation of a solvent-free epoxy coal tar anticorrosive coating as claimed in any one of claims 1 to 4, characterized in that, Comprising the following steps: The bisphenol A type epoxy resin with an epoxy equivalent weight of 180~190g / eq, the bisphenol A type epoxy resin with an epoxy equivalent weight of 200~240g / eq, benzyl alcohol, medium temperature liquid pitch, silane coupling agent, defoaming agent, leveling agent, hindered phenolic antioxidant, 1000 mesh talc powder, 1000 mesh barite powder, 800 mesh mica powder, carbon black, fumed silica, organic bentonite are added into the tank, mixed uniformly to obtain a first mixture; The first mixture is ground with a grinder to obtain component A; The cardanol modified phenolic amine, cashew nut shell oil modified alicyclic amine, modified phenolic amine, medium temperature liquid pitch, silane coupling agent, defoaming agent, leveling agent, hindered phenolic antioxidant, 1000 mesh heavy calcium powder, 1000 mesh quartz powder, 800 mesh mica powder, carbon black, fumed silica, organic bentonite are added into the tank, mixed uniformly to obtain a second mixture; The second mixture is ground with a grinder to obtain component B; The A component and the B component are mixed uniformly to obtain the solvent-free epoxy coal tar pitch anticorrosive coating.

6. The preparation method of claim 5, wherein, The bisphenol A type epoxy resin with an epoxy equivalent weight of 180~190g / eq, the bisphenol A type epoxy resin with an epoxy equivalent weight of 200~240g / eq, benzyl alcohol, medium temperature liquid pitch, silane coupling agent, defoaming agent, leveling agent, hindered phenolic antioxidant, 1000 mesh talc powder, 1000 mesh barite powder, 800 mesh mica powder, carbon black, fumed silica, organic bentonite are added into the tank, including: The bisphenol A type epoxy resin with an epoxy equivalent weight of 180~190g / eq, the bisphenol A type epoxy resin with an epoxy equivalent weight of 200~240g / eq, benzyl alcohol, medium temperature liquid pitch, silane coupling agent, defoaming agent, leveling agent, hindered phenolic antioxidant are added into the tank, and 1000 mesh talc powder, 1000 mesh barite powder, 800 mesh mica powder, carbon black, fumed silica, organic bentonite are added into the tank under stirring; The cardanol modified phenolic amine, cashew nut shell oil modified alicyclic amine, modified phenolic amine, medium temperature liquid pitch, silane coupling agent, defoaming agent, leveling agent, hindered phenolic antioxidant, 1000 mesh heavy calcium powder, 1000 mesh quartz powder, 800 mesh mica powder, carbon black, fumed silica, organic bentonite are added into the tank, including: Cashew phenol modified phenolic amine, cashew nut shell oil modified alicyclic amine, modified phenolic amine, medium temperature liquid pitch, silane coupling agent, defoaming agent, leveling agent, hindered phenolic antioxidant are added into the tank, 1000 mesh heavy calcium powder, 1000 mesh quartz powder, 800 mesh mica powder, carbon black, fumed silica, organic bentonite are added under stirring.

7. The preparation method of claim 6, wherein, The bisphenol A type epoxy resin with an epoxy equivalent weight of 180-190 g / eq, the bisphenol A type epoxy resin with an epoxy equivalent weight of 200-240 g / eq, benzyl alcohol, medium temperature liquid pitch, silane coupling agent, defoaming agent, leveling agent, hindered phenolic antioxidant, 1000 mesh talc powder, 1000 mesh barite powder, 800 mesh mica powder, carbon black, fumed silica, organic bentonite are added into the tank, and are uniformly mixed to obtain a first mixture, comprising: The bisphenol A type epoxy resin with an epoxy equivalent weight of 180-190 g / eq, the bisphenol A type epoxy resin with an epoxy equivalent weight of 200-240 g / eq, benzyl alcohol, medium temperature liquid pitch, silane coupling agent, defoaming agent, leveling agent, hindered phenolic antioxidant are added into the tank, and 1000 mesh talc powder, 1000 mesh barite powder, 800 mesh mica powder, carbon black, fumed silica, organic bentonite are added under stirring at a stirring speed of 1500-2500 rpm, and the stirring is continued for 30-40 min to obtain a first mixture.

8. The preparation method of claim 5, wherein, The first mixture is ground by a grinder to a fineness of solids in the first mixture of 90 μm or less.

9. The preparation method of claim 6, wherein, Cashew phenol modified phenolic amine, cashew nut shell oil modified alicyclic amine, modified phenolic amine, medium temperature liquid pitch, silane coupling agent, defoaming agent, leveling agent, hindered phenolic antioxidant, 1000 mesh heavy calcium powder, 1000 mesh quartz powder, 800 mesh mica powder, carbon black, fumed silica, organic bentonite are added into the tank, and are uniformly mixed to obtain a second mixture, comprising: Cashew phenol modified phenolic amine, cashew nut shell oil modified alicyclic amine, modified phenolic amine, medium temperature liquid pitch, silane coupling agent, defoaming agent, leveling agent, hindered phenolic antioxidant are added into the tank, and 1000 mesh heavy calcium powder, 1000 mesh quartz powder, 800 mesh mica powder, carbon black, fumed silica, organic bentonite are added under stirring at a stirring speed of 1500-2500 rpm, and the stirring is continued for 30-40 min to obtain a second mixture.

10. The preparation method of claim 5, wherein, The second mixture is ground by a grinder to a fineness of solids in the second mixture of 90 μm or less.

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