CN110724440A - Low-temperature-resistant two-component solvent-free epoxy coating for pipeline joint coating - Google Patents
Low-temperature-resistant two-component solvent-free epoxy coating for pipeline joint coating Download PDFInfo
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Abstract
A low-temperature-resistant two-component solvent-free epoxy coating comprises a component A and a component B, wherein the component A comprises the following components in percentage by weight: 30-45% of bisphenol F type epoxy resin, 5-10% of bisphenol A type epoxy resin, 5-10% of epoxy butyronitrile prepolymer, 3-7% of glycidyl ether reactive diluent, 15-25% of modified silica powder, 8-15% of titanium dioxide, 3-10% of aluminum dihydrogen tripolyphosphate, 4-10% of mica powder, 0.6-1.4% of thixotropic agent, 0.2-0.5% of dispersing agent, 0.2-0.5% of flatting agent, 0.3-0.7% of defoaming agent and 0.1-0.7% of carbon black; the component B comprises: 50-75% of Mannich base and 25-50% of thiourea-polyamine condensate. Compared with the common epoxy coating, the low-temperature-resistant two-component solvent-free epoxy coating for pipeline joint coating has the characteristics of high low-temperature curing speed, no crystallization or precipitation, excellent low-temperature bending resistance, excellent low-temperature impact resistance, excellent hot water soaking resistance, excellent cold and hot shock resistance and the like.
Description
Technical Field
The invention relates to a low-temperature-resistant bi-component solvent-free epoxy anticorrosive coating for an oil-gas pipeline joint coating, belonging to the technical field of oil-gas pipeline corrosion prevention.
Background
At present, the main anticorrosive coating of domestic oil and gas pipelines mostly adopts a 3PE anticorrosive coating, and most of joint coating anticorrosive materials still use a radiation crosslinking polyethylene heat shrinkable tape. The radiation crosslinked polyethylene has very high insulation resistance, so that the cathode protection current can be shielded, and the cathode protection current fails. The double-component solvent-free epoxy coating is used as a novel joint coating material, has the advantages of simple coating process, easy repair, reliable inspection result, no cathodic protection current shielding and the like, and is rapidly developed in the field of joint coating corrosion prevention of domestic pipelines.
At present, a two-component solvent-free epoxy coating for pipeline joint coating corrosion prevention is generally composed of a component A consisting of epoxy resin, a filler, a functional auxiliary agent and the like, and a component B consisting of a curing agent fatty amine, a phenolic aldehyde amine and the like.
With the popularization and application of the two-component solvent-free epoxy coating in the field of oil and gas pipeline joints, the existing two-component solvent-free epoxy coating on the market has the defects that the ① commonly used two-component solvent-free epoxy coating for pipeline joints has very slow curing speed even is not cured when the temperature is lower than 0 ℃, the curing speed is not favorable for winter construction of pipeline joint corrosion prevention in northern areas of China, the ② conventional two-component solvent-free epoxy coating has high rigidity and high low-temperature brittleness after curing, low-temperature cracking is easy to occur in northern areas of China (the temperature can reach minus 30 ℃ in winter), corrosion failure is caused, the ③ conventional two-component solvent-free epoxy coating has poor low-temperature bending resistance, and when the pipeline is welded and is laid down after corrosion prevention in the northern areas, cracking is easy to occur in the pipeline joint position when the pipeline is bent slightly, and corrosion prevention failure of the joint corrosion is directly caused.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide the low-temperature-resistant two-component solvent-free epoxy coating for the pipeline joint coating, which has the advantages of simple and convenient construction in winter, good low-temperature flexibility, excellent low-temperature impact resistance and low-temperature bending resistance, excellent adhesion performance to a pipeline body and a pipe body anticorrosive coating, high hardness and hot water immersion resistance.
A low-temperature-resistant two-component solvent-free epoxy coating comprises a component A and a component B, wherein the component A comprises epoxy resin, epoxy butyronitrile prepolymer, glycidyl ether reactive diluent, modified silica powder, titanium dioxide, aluminum dihydrogen tripolyphosphate, mica powder, thixotropic agent, dispersing agent, flatting agent, defoaming agent and carbon black; the component B comprises Mannich base and thiourea-polyamine condensate.
Preferably, the component A comprises the following components in percentage by weight: 30-45% of bisphenol F type epoxy resin, 5-10% of bisphenol A type epoxy resin, 5-10% of epoxy butyronitrile prepolymer, 3-7% of glycidyl ether reactive diluent, 15-25% of modified silica powder, 8-15% of titanium dioxide, 3-10% of aluminum dihydrogen tripolyphosphate, 4-10% of mica powder, 0.6-1.4% of thixotropic agent, 0.2-0.5% of dispersing agent, 0.2-0.5% of flatting agent, 0.3-0.7% of defoaming agent and 0.1-0.7% of carbon black; the component B comprises: 50-75% of Mannich base and 25-50% of thiourea-polyamine condensate.
More preferably, the composition of the component A is as follows by weight percentage: 40% of bisphenol F type epoxy resin, 5% of bisphenol A type epoxy resin, 5% of epoxy butyronitrile prepolymer, 5% of glycidyl ether reactive diluent, 20% of modified silica micropowder, 9% of titanium dioxide, 7% of aluminium dihydrogen tripolyphosphate, 7% of mica powder, 0.9% of thixotropic agent, 0.3% of dispersing agent, 0.3% of flatting agent, 0.4% of defoaming agent and 0.1% of carbon black.
More preferably, the component B comprises the following components in percentage by weight: 75% of Mannich base and 25% of thiourea-polyamine condensate.
Preferably, the weight ratio of the component A to the component B is as follows: 100: 15-25. More preferably, the weight ratio of the component A to the component B is as follows: 100: 20.
preferably, the specification of the bisphenol F type epoxy resin is as follows: the epoxy equivalent is 160-185 g/eq.
Preferably, the specification of the bisphenol a type epoxy resin is as follows: the epoxy equivalent is 180 to 230 g/eq.
Preferably, the specifications of the epoxy butyronitrile prepolymer are as follows: the epoxy equivalent is 320-390 g/eq, the nitrile rubber content is 40 wt%, and the viscosity is 100000-.
Preferably, the glycidyl ether reactive diluent is any one of allyl glycidyl ether, cresyl glycidyl ether, phenyl glycidyl ether and butyl glycidyl ether or a mixture of allyl glycidyl ether, cresyl glycidyl ether, phenyl glycidyl ether and butyl glycidyl ether in any proportion.
Preferably, the modified silicon micropowder is silicon micropowder modified by a silane coupling agent or a titanate coupling agent.
Preferably, the titanium dioxide is rutile type titanium dioxide with 400 meshes to 800 meshes.
Preferably, the particle size of the aluminum dihydrogen tripolyphosphate is 800 meshes to 1000 meshes.
Preferably, the particle size of the mica powder is 600 meshes to 1000 meshes.
Preferably, the thixotropic agent is any one of organic bentonite, hydrogenated castor oil derivative, fumed silica and polyamide wax or a mixture of the organic bentonite, the hydrogenated castor oil derivative and the fumed silica in any proportion.
Preferably, the dispersant is any one of fatty acid dispersant, fatty amide dispersant and ester dispersant or a mixture of the fatty acid dispersant, the fatty amide dispersant and the ester dispersant in any proportion.
Preferably, the leveling agent is any one of polydimethylsiloxane, polyether polyester modified organic siloxane and alkyl modified organic siloxane or a mixture of the polydimethylsiloxane, the polyether polyester modified organic siloxane and the alkyl modified organic siloxane in any proportion.
Preferably, the defoaming agent is any one of a silicone defoaming agent and a polyether modified silicone defoaming agent or a mixture of the silicone defoaming agent and the polyether modified silicone defoaming agent in any proportion.
Preferably, the mannich bases are of the specification: the amine value is 300-500 mg KOH/g.
Preferably, the thiourea-polyamine condensate is a polyamine-thiourea curing agent.
The invention relates to a low-temperature-resistant two-component solvent-free epoxy coating for pipeline joint coating, which comprises a component A and a component B, wherein the preparation method comprises the following steps: adding epoxy resin, epoxy butyronitrile prepolymer and glycidyl ether active diluent into a stirring tank according to the weight ratio, heating to 50 ℃, stirring for 10-15 minutes at the stirring speed of 1000 revolutions/minute, reducing the stirring speed to 200 revolutions/minute after uniform stirring, adding a thixotropic agent, a leveling agent, a dispersing agent, an antifoaming agent and carbon black, stirring for 10 minutes, finally sequentially adding modified silica powder, titanium dioxide, aluminium dihydrogen tripolyphosphate and mica powder, increasing the stirring speed to 400 revolutions/minute, stirring for 35-40 minutes, grinding by using a sand mill, filtering by using a 150-mesh sieve, packaging the filtered material with the fineness of below 100 mu m, and returning the filtered material with the fineness of above 100 mu m to the sand mill for grinding again until the fineness reaches the requirement.
The invention relates to a low-temperature-resistant two-component solvent-free epoxy coating for pipeline joint coating, wherein a preparation method of a component B comprises the following steps: adding the Mannich base and the thiourea-polyamine condensate into a stirring tank according to the weight ratio, stirring for 15min at the speed of 200 r/min, uniformly mixing and packaging.
The bisphenol F type epoxy resin in the component A has very low viscosity, does not crystallize at low temperature, is particularly suitable for being used in low-temperature environment, and has the cured product performance which is slightly lower than the heat deformation temperature and has better other performances than the bisphenol A type epoxy resin. Bisphenol A epoxy resins are most widely used as epoxy resins, and a small amount of bisphenol A epoxy resin can improve the heat resistance of an epoxy cured product. The epoxy butyronitrile prepolymer is nitrile rubber modified epoxy resin, and the introduction of a rubber chain segment greatly improves the low-temperature impact resistance, low-temperature bending resistance and cold and hot impact resistance of a paint cured product. The glycidyl ether reactive diluent has low viscosity, can adjust the low-temperature fluidity of the coating, is convenient for the low-temperature operation of the coating, contains active groups in molecules, can react with a curing agent of an adhesive without gas escaping, generally has no influence on the performance of a cured adhesive layer, and also has a toughening effect. The thixotropic agent is used for preventing sagging during curing; the dispersant has the function of uniformly dispersing powder in the production and stirring process; the leveling agent has the functions of improving the leveling property and the gloss, generating a long wave effect and preventing the shrinkage cavity of a system; the role of the defoamer is to level and defoam. The coupling agent modified silica micropowder has the advantages of high hardness, low thermal conductivity, high temperature resistance, stable insulation and chemical properties and the like, and can be used in solvent-free epoxy coating to improve the mechanical properties of the coating such as hardness, impact resistance and the like, and improve the water absorption rate, the electrical strength, the volume resistivity and the like of the coating. Titanium dioxide as a white pigment has the characteristics of higher decoloring capacity and covering power, good whiteness, light resistance, sun resistance, heat resistance and the like, and plays the roles of covering, decoloring and protecting in the coating. The tripolyphosphate radical ions in the aluminium dihydrogen tripolyphosphate molecules can generate chelate with metal ions, so that a passive film is formed on the surface of the coated metal, and the corrosion of materials such as steel, light metal and the like is greatly inhibited. The mica powder has high electrical insulation, heat resistance and good mechanical property, and can be used as a functional filler in a coating to improve the toughness, mechanical strength and heat resistance of the coating.
The Mannich base in the component B contains phenolic hydroxyl, amino and secondary amino, so that the curing agent has high curing speed, can be cured at low temperature, moist or underwater, and is particularly suitable for low-temperature construction. The thiourea-polyamine condensate has thiourea bonds, the thiourea bonds exist in a ketone type and enol type equilibrium state, and the enol type compound can exert special quick curing property by reacting with an epoxy group, particularly under the condition of low temperature, the curing of an epoxy coating is accelerated, and a coating film with excellent corrosion resistance is formed.
The low-temperature-resistant two-component solvent-free epoxy coating for the pipeline joint coating is used by mixing the component A and the component B in proportion, so that the coating is cured to form an anticorrosive coating.
The main technical indexes of the low-temperature-resistant two-component solvent-free epoxy coating for pipeline joint coating are shown in table 1.
TABLE 1 technical indexes of low temperature resistant two-component solvent-free epoxy coating for pipeline joint coating of the present invention
Compared with the prior art, the invention has the following beneficial effects:
1. the low-temperature-resistant two-component solvent-free epoxy coating for pipeline joint coating can be cured at the temperature of below 10 ℃ below zero, and compared with the common epoxy coating, the low-temperature-resistant two-component solvent-free epoxy coating has the characteristics of high low-temperature curing speed, no crystallization, no precipitation and the like.
2. The low-temperature-resistant two-component solvent-free epoxy coating for the pipeline joint coating has excellent low-temperature bending resistance, can resist bending at 1.5 degrees (-30 ℃) without cracks, and has the test method SY/T0315 appendix D.
3. The low-temperature-resistant two-component solvent-free epoxy coating for the pipeline joint coating has excellent low-temperature impact resistance, 4J impact resistance (minus 30 ℃) and no leakage point, and a test method SY/T0315 appendix E.
4. The low-temperature-resistant double-component solvent-free epoxy coating for the pipeline joint coating has excellent hot water soaking resistance, after the coating is soaked in hot water at 80 ℃ for 8 months, the adhesive force is more than or equal to 8MPa by a 23 ℃ pull-open method, the retention rate is more than or equal to 80 percent, and a test method SY/T6854 appendix A.
5. The low-temperature-resistant bi-component solvent-free epoxy coating for pipeline joint coating has excellent cold and heat shock resistance, is qualified at the temperature of-30-50 ℃ after freeze-thaw cycling (20 times), and is shown in appendix B of a test method SY/T0320.
Detailed Description
The present invention is further illustrated by the following examples, but is not limited to the details of the description.
Example 1
A low-temperature-resistant two-component solvent-free epoxy coating comprises a component A and a component B. Wherein:
(1) preparation of the component A: adding 40 parts of bisphenol F type epoxy resin (YDF-162), 5 parts of bisphenol A type epoxy resin (E-51), 5 parts of epoxy butyronitrile prepolymer (Jia Di Da chemical 86840) and 5 parts of glycidyl ether active diluent (AGE) into a stirring tank, heating to 50 ℃, stirring for 15 minutes at the stirring speed of 1000 revolutions per minute, uniformly stirring, reducing the stirring speed to 200 revolutions per minute, adding 0.9 part of thixotropic agent (MT6650), 0.3 part of flatting agent (DE 879), 0.3 part of dispersing agent (BYK110), 0.4 part of defoaming agent (TEAIREX 902W) and 0.1 part of carbon black, stirring for 10 minutes, finally sequentially adding 20 parts of silane coupling agent modified silica powder, 9 parts of titanium dioxide, 7 parts of aluminium dihydrogen tripolyphosphate and 7 parts of white powder, increasing the stirring speed to 500 revolutions per minute, stirring for 40 minutes, grinding by a sand mill, filtering by a 150-mesh sieve, and packaging the filtered material with the fineness of below 100 mu m, and returning the filtered material with the fineness of above 100 mu m to the sand mill for secondary grinding until the fineness meets the requirement.
(2) B, preparation of a component: 75 parts of Mannich base (T33) and 25 parts of thiourea-polyamine condensate (F-ZS-4 of Nippon Fuji chemical industry Co., Ltd.) are added into a stirring tank, stirred for 15min at the speed of 200 r/min, mixed uniformly and packaged.
(3) The weight ratio of the component A to the component B is A: b is 100: 20.
the application method of the epoxy coating comprises the steps of carrying out sand blasting and rust removal on the surface of a steel pipe to Sa2.5 grade or manual rust removal St3 grade, directly carrying out flame heating and galling polarization on the surface of a polyethylene anticorrosive layer or directly carrying out polarization treatment by using a commercially available fluorine-nitrogen mixed gas, then uniformly mixing A, B components in proportion, and coating by adopting a brush coating or blade coating mode.
The performance indexes of the epoxy coating are as follows:
example 2
A low-temperature-resistant two-component solvent-free epoxy coating comprises a component A and a component B. Wherein:
(1) preparation of the component A: adding 30 parts of bisphenol F type epoxy resin (NPEF-170), 10 parts of bisphenol A type epoxy resin (E-52), 10 parts of epoxy butyronitrile prepolymer (Jia Di Da chemical 86840) and 6 parts of glycidyl ether active diluent (691) into a stirring tank, heating to 50 ℃, stirring for 10 minutes at the stirring speed of 1000 revolutions per minute, uniformly stirring, reducing the stirring speed to 200 revolutions per minute, adding 0.8 part of thixotropic agent (OPTIMA), 0.3 part of flatting agent (KMT-5510), 0.4 part of dispersing agent (BYK190), 0.3 part of defoaming agent (BYK A535) and 0.2 part of carbon black, stirring for 10 minutes, finally adding 19 parts of titanate coupling agent modified silica powder, 12 parts of titanium dioxide, 6 parts of aluminium dihydrogen tripolyphosphate and 5 parts of white mica powder in sequence, increasing the stirring speed to 400 revolutions per minute, stirring for 35 minutes, grinding by using a sand mill, filtering by using a 150-mesh sieve, and packaging the filtered material with the fineness of below 100 mu m, and returning the filtered material with the fineness of above 100 mu m to the sand mill for secondary grinding until the fineness meets the requirement.
(2) B, preparation of a component: 65 parts of Mannich base (T31) and 35 parts of thiourea-polyamine condensate (F-ZS-4 of Nippon Fuji chemical industry Co., Ltd.) are added into a stirring tank, stirred for 15min at the speed of 200 r/min, mixed uniformly and packaged.
(3) The weight ratio of the component A to the component B is 100: 21.
The epoxy coating was applied in the same manner as in example 1.
The performance indexes of the epoxy coating are as follows:
example 3
A low-temperature-resistant two-component solvent-free epoxy coating comprises a component A and a component B. Wherein:
(1) preparation of the component A: adding 35 parts of bisphenol F type epoxy resin (YDF-162), 7 parts of bisphenol A type epoxy resin (E-51), 8 parts of epoxy butyronitrile prepolymer (Jia Di Da chemical 86840) and 4 parts of glycidyl ether active diluent (AGE) into a stirring tank, heating to 50 ℃, stirring for 12 minutes at the stirring speed of 1000 revolutions per minute, uniformly stirring, reducing the stirring speed to 200 revolutions per minute, adding 1.2 parts of thixotropic agent (8461), 0.4 part of flatting agent (BYK333), 0.4 part of dispersing agent (BYK-P104S), 0.5 part of defoaming agent (2566) and 0.5 part of carbon black, stirring for 10 minutes, finally sequentially adding 22 parts of silane coupling agent modified silica powder, 11 parts of titanium dioxide, 5 parts of aluminium dihydrogen tripolyphosphate and 5 parts of white mica powder, increasing the stirring speed to 450 revolutions per minute, stirring for 37 minutes, grinding by using a sand screen, filtering by using a 150-mesh sieve, and packaging the filtered material with the fineness of below 100 mu m, and returning the filtered material with the fineness of above 100 mu m to the sand mill for secondary grinding until the fineness meets the requirement.
(2) B, preparation of a component: adding 50 parts of Mannich base (T33) and 50 parts of thiourea-polyamine condensate (F-ZS-4 of Nippon Fuji chemical industry Co., Ltd.) into a stirring tank, stirring at 200 rpm for 15min, mixing well and packaging.
(3) The weight ratio of the component A to the component B is 100: 18.
The epoxy coating was applied in the same manner as in example 1.
The performance indexes of the epoxy coating are as follows:
comparative example 1
A low-temperature-resistant two-component solvent-free epoxy coating comprises a component A and a component B. Wherein:
(1) preparation of the component A: adding 40 parts of bisphenol F type epoxy resin (YDF-162), 5 parts of bisphenol A type epoxy resin (E-51) and 5 parts of glycidyl ether active diluent (AGE) into a stirring tank, heating to 50 ℃, stirring for 15 minutes, stirring at 1000 revolutions per minute, uniformly stirring, reducing the stirring speed to 200 revolutions per minute, adding 0.9 part of thixotropic agent (MT6650), 0.3 part of flatting agent (Demodex 879), 0.3 part of dispersing agent (BYK110), 0.4 part of defoaming agent (TEGO AIREX 902W) and 0.1 part of carbon black, stirring for 10 minutes, sequentially adding 25 parts of silane coupling agent modified silicon powder, 9 parts of titanium dioxide, 7 parts of aluminium dihydrogen tripolyphosphate and 7 parts of white mica powder, increasing the stirring speed to 500 revolutions per minute, stirring for 40 minutes, grinding by a sand mill, filtering by a 150-mesh sieve, packaging the filtered materials with the fineness below 100 mu m, and returning the filtered material with the fineness of over 100um to the sand mill for secondary grinding until the fineness reaches the requirement.
(2) B, preparation of a component: 75 parts of Mannich base (T33) and 25 parts of thiourea-polyamine condensate (F-ZS-4 of Nippon Fuji chemical industry Co., Ltd.) are added into a stirring tank, stirred for 15min at the speed of 200 r/min, mixed uniformly and packaged.
(3) The weight ratio of the component A to the component B is A: b is 100: 19.
the epoxy coating was applied in the same manner as in example 1.
The performance indexes of the epoxy coating are as follows:
comparative example 2
A low-temperature-resistant two-component solvent-free epoxy coating comprises a component A and a component B. Wherein:
(1) preparation of the component A: adding 40 parts of bisphenol F type epoxy resin (YDF-162), 5 parts of bisphenol A type epoxy resin (E-51), 5 parts of liquid nitrile rubber (CTBN1300X8, viscosity of 135000cps @27 ℃, molecular weight of 3550) and 5 parts of glycidyl ether active diluent (AGE) into a stirring tank, heating to 50 ℃, stirring for 15 minutes at the stirring speed of 1000 revolutions per minute, uniformly stirring, reducing the stirring speed to 200 revolutions per minute, adding 0.9 part of thixotropic agent (MT6650), 0.3 part of flatting agent (Demodex 879), 0.3 part of dispersing agent (BYK110), 0.4 part of defoaming agent (TEGO AIREX W902) and 0.1 part of carbon black, stirring for 10 minutes, finally sequentially adding 20 parts of silane coupling agent modified silicon micro powder, 9 parts of titanium dioxide, 7 parts of aluminium dihydrogen tripolyphosphate and 7 parts of white mica powder, increasing the stirring speed to 500 revolutions per minute, stirring for 40 minutes, grinding by a sand mill, filtering with 150 mesh sieve, packaging the filtered material with fineness below 100 μm, and grinding the filtered material with fineness above 100 μm again until the fineness reaches the requirement.
(2) B, preparation of a component: 75 parts of Mannich base (T33) and 25 parts of thiourea-polyamine condensate (F-ZS-4 of Nippon Fuji chemical industry Co., Ltd.) are added into a stirring tank, stirred for 15min at the speed of 200 r/min, mixed uniformly and packaged.
(3) The weight ratio of the component A to the component B is A: b is 100: 20.
the epoxy coating was applied in the same manner as in example 1.
The performance indexes of the epoxy coating are as follows:
as can be seen from the comparison of the performance test results of the examples and the comparative examples, when the low-temperature-resistant two-component solvent-free epoxy coating for the pipeline joint coating provided by the invention is used for corrosion prevention of the low-temperature pipeline joint coating, the epoxy butyronitrile prepolymer added into the system not only greatly improves the low-temperature toughness of the epoxy resin, but also does not influence the high-temperature boiling resistance of the coating. Compared with the comparative example performance test result of adding liquid nitrile rubber, the nitrile rubber can also improve the low-temperature resistance of the coating, but the nitrile rubber cannot be well compatible with other epoxy resin in a system due to the difference of molecular structure, viscosity difference and the like between the nitrile rubber and the epoxy resin, the cross-linking density of a cured product is relatively low, and the high-temperature boiling resistance cannot meet the requirement; the epoxy chain segment of the epoxy butyronitrile prepolymer can be well compatible with the epoxy resin of a system, and can react with other epoxy resin together with a curing agent to obtain a coating with high crosslinking density and high temperature resistance.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. Not all embodiments are exhaustive. All obvious changes and modifications which are obvious to the technical scheme of the invention are covered by the protection scope of the invention.
Claims (9)
1. A low-temperature-resistant two-component solvent-free epoxy coating is characterized by comprising a component A and a component B, wherein the component A comprises epoxy resin, epoxy butyronitrile prepolymer, glycidyl ether reactive diluent, modified silica micropowder, titanium dioxide, aluminum dihydrogen tripolyphosphate, mica powder, thixotropic agent, dispersing agent, leveling agent, defoaming agent and carbon black; the component B comprises Mannich base and thiourea-polyamine condensate.
2. The low temperature resistant two-component solvent-free epoxy coating of claim 1, wherein the component a comprises, in weight percent: 30-45% of bisphenol F type epoxy resin, 5-10% of bisphenol A type epoxy resin, 5-10% of epoxy butyronitrile prepolymer, 3-7% of glycidyl ether reactive diluent, 15-25% of modified silica powder, 8-15% of titanium dioxide, 3-10% of aluminum dihydrogen tripolyphosphate, 4-10% of mica powder, 0.6-1.4% of thixotropic agent, 0.2-0.5% of dispersing agent, 0.2-0.5% of flatting agent, 0.3-0.7% of defoaming agent and 0.1-0.7% of carbon black; the component B comprises: 50-75% of Mannich base and 25-50% of thiourea-polyamine condensate; preferably, the component A comprises the following components in percentage by weight: 40% of bisphenol F type epoxy resin, 5% of bisphenol A type epoxy resin, 5% of epoxy butyronitrile prepolymer, 5% of glycidyl ether reactive diluent, 20% of modified silica micropowder, 9% of titanium dioxide, 7% of aluminium dihydrogen tripolyphosphate, 7% of mica powder, 0.9% of thixotropic agent, 0.3% of dispersing agent, 0.3% of flatting agent, 0.4% of defoaming agent and 0.1% of carbon black; the component B comprises the following components: 75% of Mannich base and 25% of thiourea-polyamine condensate.
3. The low temperature resistant two-component solvent-free epoxy coating according to any one of claims 1 to 2, wherein the weight ratio of the component A to the component B is: 100: 15-25; preferably, the weight ratio of the component A to the component B is as follows: 100: 20.
4. the low temperature resistant two-component solvent-free epoxy coating according to any one of claims 2 to 3, wherein the bisphenol F type epoxy resin has the following specifications: the epoxy equivalent is 160-185 g/eq; the specification of the bisphenol A type epoxy resin is as follows: the epoxy equivalent is 180 to 230 g/eq.
5. The low temperature resistant two-component solvent-free epoxy coating according to any one of claims 1 to 4, wherein the epoxy nitrile prepolymer has the following specifications: the epoxy equivalent is 320-390 g/eq, the nitrile rubber content is 40 wt%, and the viscosity is 100000-; the glycidyl ether reactive diluent is any one of allyl glycidyl ether, tolyl glycidyl ether, phenyl glycidyl ether and butyl glycidyl ether or a mixture of the allyl glycidyl ether, the tolyl glycidyl ether, the phenyl glycidyl ether and the butyl glycidyl ether in any proportion.
6. The low temperature resistant two-component solvent-free epoxy coating according to any one of claims 1 to 5, wherein the modified silica micropowder is a silane coupling agent or titanate coupling agent modified silica micropowder; the titanium dioxide is rutile type titanium dioxide with 400 meshes to 800 meshes; the granularity of the aluminum dihydrogen tripolyphosphate is 800 meshes to 1000 meshes; the granularity of the mica powder is 600 meshes to 1000 meshes; the thixotropic agent is any one of organic bentonite, hydrogenated castor oil derivatives, fumed silica and polyamide wax or a mixture of the organic bentonite, the hydrogenated castor oil derivatives, the fumed silica and the polyamide wax in any proportion; the dispersing agent is any one of fatty acid dispersing agent, fatty amide dispersing agent and ester dispersing agent or a mixture of the dispersing agent and the amide dispersing agent in any proportion; the leveling agent is any one of polydimethylsiloxane, polyether polyester modified organic siloxane and alkyl modified organic siloxane or a mixture of the polydimethylsiloxane, the polyether polyester modified organic siloxane and the alkyl modified organic siloxane in any proportion; the defoaming agent is any one of a silicone defoaming agent and a polyether modified silicone defoaming agent or a mixture of the silicone defoaming agent and the polyether modified silicone defoaming agent in any proportion.
7. The low temperature resistant two-component solvent-free epoxy coating of any one of claims 1 to 6, wherein the Mannich base is specified as: the amine value is 300-500 mg KOH/g; the thiourea-polyamine condensate is a polyamine-thiourea curing agent.
8. The low temperature resistant two-component solvent-free epoxy coating according to any one of claims 1 to 7, wherein the preparation method of the component A comprises: adding epoxy resin, epoxy butyronitrile prepolymer and glycidyl ether active diluent into a stirring tank according to the weight ratio, heating to 50 ℃, stirring for 10-15 minutes at the stirring speed of 1000 revolutions/minute, reducing the stirring speed to 200 revolutions/minute after uniform stirring, adding a thixotropic agent, a leveling agent, a dispersing agent, an antifoaming agent and carbon black, stirring for 10 minutes, finally sequentially adding modified silica powder, titanium dioxide, aluminium dihydrogen tripolyphosphate and mica powder, increasing the stirring speed to 400 revolutions/minute, stirring for 35-40 minutes, grinding by using a sand mill, filtering by using a 150-mesh sieve, packaging the filtered material with the fineness of below 100 mu m, and returning the filtered material with the fineness of above 100 mu m to the sand mill for grinding again until the fineness reaches the requirement.
9. The low temperature resistant two-component solvent-free epoxy coating according to any one of claims 1 to 8, wherein the B component is prepared by a method comprising: adding the Mannich base and the thiourea-polyamine condensate into a stirring tank according to the weight ratio, stirring for 15min at the speed of 200 r/min, uniformly mixing and packaging.
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