CN111635657A - Titanium-based polymer alloy welding seam protection coating functional material and preparation method thereof - Google Patents

Titanium-based polymer alloy welding seam protection coating functional material and preparation method thereof Download PDF

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CN111635657A
CN111635657A CN202010394339.XA CN202010394339A CN111635657A CN 111635657 A CN111635657 A CN 111635657A CN 202010394339 A CN202010394339 A CN 202010394339A CN 111635657 A CN111635657 A CN 111635657A
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coating
resin
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刘平
张弛
岑日强
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Lanzhou Xinghe Petrochemical Anticorrosion Co ltd
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Lanzhou Xinghe Petrochemical Anticorrosion Co ltd
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    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/08—Anti-corrosive paints
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    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
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    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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    • B05D2202/30—Metallic substrate based on refractory metals (Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, W)
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Abstract

The invention provides a titanium-based high-molecular alloy weld joint protective coating functional material, which is a composite functional material mainly comprising a nano organic titanium polymer serving as a base material, nano material dispersion slurry serving as a functional filler, high-molecular resin serving as an auxiliary material, active zinc powder serving as a sacrificial anode, an active diluent serving as a diluent and a functional auxiliary agent. The welding bead protection coating material takes a welding bead metal substrate as a cathode, takes active zinc powder as a sacrificial anode, and transmits electrons through a conductive network constructed in a coating by a nano conductive agent to form a closed loop circuit in a welding bead area so as to remove negative polarization, thereby destroying the current shielding effect of an insulating coating, leading the potential between the welding bead metal substrates to tend to be balanced, playing the role of electrochemical protection and preventing the cracking of a metal welding bead caused by electrochemical corrosion.

Description

Titanium-based polymer alloy welding seam protection coating functional material and preparation method thereof
Technical Field
The invention belongs to the technical field of new chemical materials, and relates to a titanium-based polymer alloy welding seam protective coating functional material and a preparation method thereof, which are mainly applied to a welding seam protective coating for metal welding to prevent welding seams from being corroded and cracked.
Background
In the process of welding metal materials, the metal performance, the tissue structure and the chemical composition of a welding joint area can be greatly changed, and meanwhile, the welding can also have great influence on the corrosion performance of the materials. The welded joint area is the area which is most stressed, most complicated in corrosion behavior and concentrated in embodiment. In addition, surface defects caused by welding, such as flash, undercut, lack of penetration, etc., form a gap between the deposited metal and the base metal. The sputtering also forms a gap at the contact portion between the base material and the metal particles. Crevice corrosion tends to occur at these crevices in an electrolyte solution (e.g., aqueous NaCl solution). Welded surface defects undoubtedly allow for crevice corrosion to occur.
There are various corrosion behaviors of metals, of which electrochemical corrosion is the most widespread one. As the different metallic materials are welded together, the weld zone forms the galvanic cell. If the material is in an etching medium, the material with low electrode potential is an anode, and electrons at one end of the material with high potential are transferred to the lower end of the material to generate corrosion dissolution, so that the non-uniformity of the components of the welding joint area is an important factor for causing selective corrosion. When an insulating layer or a metal structure exists around the welding bead, the flow of cathodic protection current is influenced, and the welding bead cannot be effectively protected by the cathode, namely current shielding. When this occurs, the cathodic protection current shield becomes a significant cause of electrochemical corrosion.
The cathodic shield, i.e. cathodic protection, is shielded, losing electrochemical protection. When a gap exists between the coating and the steel, or the bonding force of the coating is not enough to prevent the penetration of corrosive media, and the air permeability of the coating is weak, the corrosive media penetrate through the bonding part of the anticorrosive layer and the steel, and the cathodic protection current cannot penetrate through the insulating anticorrosive layer to protect the metal substrate, so that cathodic protection shielding occurs. The essence of the cathodic protective shield is also a current shield, i.e. the insulating coating prevents the sacrificial anode from transporting the electron flow to the protective cathode. The invention develops an electrochemical protective coating material for preventing metal from corroding in dielectrics (seawater, fresh water, soil and other media) aiming at the phenomenon.
Disclosure of Invention
The invention aims to provide a titanium-based polymer alloy welding seam protective coating functional material and a preparation method thereof. The welding bead metal substrate is used as a cathode, active zinc powder is used as a sacrificial anode, a closed-loop circuit is formed in a welding line area through the dielectricity of a coating material, so that the cathode polarization is removed, when the metal potentials of different materials tend to be balanced, the electrochemical nonuniformity of the metal surface is eliminated, the corrosion cathode dissolution process is effectively inhibited, and the purpose of protection is achieved.
The invention relates to a titanium-based high-molecular alloy weld joint protective coating functional material, which is a composite functional material mainly formed by taking a nano organic titanium polymer as a base material, taking nano material dispersion slurry as a functional filler, taking high-molecular resin as an auxiliary film forming material, taking active zinc powder as a sacrificial anode, taking an active diluent as a diluent and adding a functional auxiliary agent.
Preparation of one-and normal-temperature curing type bi-component coating
The preparation method of the normal temperature curing type bi-component coating comprises the following steps:
(1) preparing nano material dispersion slurry: 10-15 parts of nano conductive agent powder, 45-55 parts of polymer resin, 15-25 parts of active diluent, 1-5 parts of conductive pigment carbon black, 5-10 parts of nano dispersant, 1-5 parts of silane coupling agent, 5-10 parts of liquid nitrile rubber and 1-5 parts of organic bentonite are mixed in parts by mass, and ball milling or graded grinding is carried out to fully disperse the mixture to obtain nano material dispersion slurry.
The nano conductive agent powder is one or a mixture of graphene and a carbon nano tube; the polymer resin is at least one of epoxy resin, phenoxy resin, polyester resin, acrylic resin and polyaspartic acid ester resin; the reactive diluent is at least one of glycidyl ether, glycidyl ester, hydroxyl silane and oxazolidine.
(2) Preparation of normal temperature curing type bi-component paint: dispersing and mixing uniformly 15-20 parts of nano organic titanium polymer, 20-25 parts of high polymer resin, 5-10 parts of nano material dispersion slurry with solid content of 10%, 5-10 parts of active diluent, 35-45 parts of active zinc powder and 3-5 parts of functional additive to obtain a coating, wherein the coating is used as a component A; a polymer reactive with the functional group of the polymer resin is selected as the curing agent, and is set as the component B.
The nanometer organic titanium polymer is TPP-I nanometer organic titanium polymer or TPP-II nanometer organic titanium polymer, the TPP-I nanometer organic titanium polymer has an epoxy functional group, and the TPP-II nanometer organic titanium polymer has a hydroxyl functional group.
The high molecular resin is epoxy resin, low-viscosity solvent-free resin containing hydroxyl or carbamide, and can be 127 or 128(828 or E-51) epoxy resin with molecular weight less than or equal to 376, or solvent-free hydroxyl polyester resin (such as Setathane D1150 and Bayer Desmophen 1652) with viscosity of 3500 +/-500 mPa.s, or low-viscosity solvent-free polyaspartate resin (such as F420, F520, F524 and D2925 polymer resin); the curing agent is selected from aliphatic or aromatic organic polyamine, modified amine or isocyanate polymers which correspond to functional groups carried by the high molecular resin and can participate in crosslinking curing reaction; the functional auxiliary agent comprises a wetting dispersant, a defoaming agent, a leveling agent, an adhesion promoter and a thixotropic anti-settling agent; the thixotropic anti-settling agent comprises fumed silica and organic bentonite.
The ball milling is carried out for 3-4 hours by using a high-energy ball mill with an ultrasonic auxiliary device, and the particle size D of the slurry after ball milling is90The nano-crystallization range is 10-100 nm. The solid-liquid ball milling process is a fully dispersing process, and the ultrasonic cavitation effect has a special dispersing effect on material refinement. It can control the size and specific distribution of micronized powder particles to a greater extent, so as to control the specific surface area of the material and make the powderThe reactivity of the particles is improved, and the preparation of the coating material is promoted. The synergistic effect of mechanical force and ultrasonic wave can not only restore the nano particle aggregate to nano scale, but also realize the coupling modification of nano particle surface modification and polymer. Due to the addition of the ultrasonic wave, the material can obtain ideal dispersion effect in the aspects of efficiency and yield of the preparation process.
The grading grinding uses a nanometer bead mill, the specific surface area of the nanometer material is large, and when the nanometer material is mixed with polymer resin (including a diluting solvent), the oil absorption is large and the interface compatibility is poor. If the dispersed slurry with high solid content is prepared, the nano powder and the resin bonding liquid are premixed and fully dispersed under the action of high shearing force, after the agglomeration phenomenon does not exist, the coarse grinding is carried out by using a serial pin type bead mill, the fine grinding is carried out by using a serial nano bead mill, and the grain diameter D of the slurry after grinding is90The nano-crystallization range is 10-100 nm; the particle size range of the grinding zirconium beads selected for coarse grinding is 0.8-1.2 mm, and the gap of the filter element is 0.6-1.0 mm; the grain size range of the grinding zirconium beads selected for fine grinding is 0.3-0.6 mm, and the gap of the filter element is 0.1-0.5 mm.
Preparation of thermosetting single-component paint
The preparation method of the thermosetting single-component coating comprises the following steps:
(1) preparing nano material dispersion slurry: by mass, 5-15 parts of nano conductive agent powder, 15-25 parts of polymer resin, 30-40 parts of reactive diluent, 1-5 parts of conductive pigment carbon black, 5-10 parts of nano dispersant, 1-5 parts of silane coupling agent, 3-8 parts of liquid nitrile rubber and 1-5 parts of thixotropic thickener are mixed, and ball milling or graded grinding is carried out for full dispersion, so as to obtain the nano material dispersion slurry.
The nano conductive agent powder is one or a mixture of graphene and a carbon nano tube; the polymer resin is at least one of epoxy resin, phenoxy resin, polyester resin, acrylic resin and polyaspartic acid ester resin; the reactive diluent is at least one of glycidyl ether, glycidyl ester, hydroxyl silane and oxazolidine.
(2) Preparation of thermosetting one-component coating: by mass, adding 5-10 parts of latent curing agent into 15-20 parts of nano organic titanium precursor polymer, 20-25 parts of high molecular resin, 5-10 parts of nano material dispersion slurry with solid content of 10%, 5-10 parts of reactive diluent, 35-45 parts of active zinc powder and 3-5 parts of functional additive, and dispersing and mixing uniformly to obtain the single-component thermosetting coating.
The high polymer resin is resin with epoxy group, hydroxyl group or carbamide group; when the high molecular resin is epoxy resin, dicyandiamide, methylimidazole or acid anhydride is selected as a latent curing agent; when the high polymer resin is hydroxyl-containing resin, blocked isocyanate or amino resin is selected as a latent curing agent; the functional additives are wetting dispersing agents, defoaming agents, flatting agents, adhesion promoters and thixotropic thickening agents; the thixotropic anti-settling agent comprises fumed silica and organic bentonite.
The ball milling is carried out for 3-4 hours by using a high-energy ball mill with an ultrasonic auxiliary device, and the particle size D of the slurry after ball milling is90The nano-crystallization range is 10-100 nm. The solid-liquid ball milling process is a fully dispersing process, and the ultrasonic cavitation effect has a special dispersing effect on material refinement. The method can control the size and specific distribution condition of micronized powder particles to a greater extent, thereby controlling the specific surface area of the material, improving the reactivity of the powder particles and promoting the preparation of the coating material. The synergistic effect of mechanical force and ultrasonic wave can not only restore the nano particle aggregate to nano scale. The chemical bond of the high molecular polymer is broken under the action of mechanical force to generate bonding reaction, and meanwhile, the surface modification of the nano particles and the coupling modification of the polymer can be realized. Due to the addition of the ultrasonic wave, the material can obtain ideal dispersion effect in the aspects of efficiency and yield of the preparation process.
The grading grinding uses a nanometer bead mill, under the action of high shearing force, nanometer powder and resin bonding liquid are premixed and fully dispersed, after the phenomenon of 'ball wrapping' does not exist, the rod pin type bead mill connected in series is used for rough grinding, the nanometer bead mill connected in series is used for fine grinding, and after grinding, the fine grinding is carried outParticle size D of the slurry90The nano-crystallization range is 10-100 nm; the particle size range of the grinding zirconium beads selected for coarse grinding is 0.8-1.2 mm, and the gap of the filter element is 0.6-1.0 mm; the grain size range of the grinding zirconium beads selected for fine grinding is 0.3-0.6 mm, and the gap of the filter element is 0.1-0.5 mm.
Application method and performance of titanium-based polymer alloy welding seam protection coating functional material
After the titanium-based polymer alloy welding seam protective coating functional material is prepared by the method, the titanium-based polymer alloy welding seam protective coating functional material can be frequently applied to a metal welding bead.
The specific application method of the normal temperature curing type bi-component coating is as follows:
(1) surface treatment of the bead steel: polishing and flattening the welding line by adopting a manual electric angle grinder, and then performing shot blasting or sand blasting treatment, wherein the roughness is in accordance with ISO Ru 30-40 mu m, and the shot blasting grade is in accordance with ISO Sa2.5 grade quality standard;
(2) coating of normal temperature curing type two-component coating: determining the mass ratio of the A-component coating to the B-component curing agent through chemical calculation, weighing and mixing the A, B components according to the mass ratio, uniformly stirring, coating wet films with the thickness of 100-120 mu m on the upper side and the lower side of a weld joint and the weld joint by adopting blade coating or brush coating, and after drying, testing the surface resistivity of the coating by using a CN66M/YFT9 static conductive coating resistivity tester.
The specific application method of the thermosetting one-component coating is as follows:
(1) surface treatment of the bead steel: after the welding line is polished to be flat, performing shot blasting or sand blasting treatment, wherein the roughness is required to meet ISORu 30-40 mu m, and the shot blasting grade is required to meet ISO Sa2.5 grade quality standard;
(2) application of the thermosetting one-component coating: coating a wet film with the thickness of 100-120 mu m on the upper side and the lower side of a weld seam and the weld seam by adopting blade coating or brush coating, and drying and curing to form a film; the drying and curing temperature is 100-180 ℃ (the drying and curing temperature is higher than the deblocking temperature of the latent curing agent by 20-30 ℃), the latent curing agent can be deblocked or activated to carry out crosslinking and curing reaction, and the curing time is about 20-30 minutes. The thermosetting single-component coating is suitable for construction in factory workshops with drying equipment. After drying, curing and film forming, a CN66M/YFT9 static conductive coating resistivity tester is used for testing the surface resistivity of the coating.
The normal temperature curing type double-component coating and the thermosetting type single-component coating have no different performance and show excellent performance through coating test inspection. The test results are shown in table 1.
Figure DEST_PATH_IMAGE001
In conclusion, the titanium-based polymer alloy welding seam protection functional coating material takes a welding seam metal substrate as a cathode, takes active zinc powder as a sacrificial anode, and transmits electrons through a conductive network constructed in the coating by a nano conductive agent to form a closed-loop circuit in a welding seam area so as to remove negative polarization, thereby destroying the current shielding (or called cathode shielding) effect of an insulating coating.
Detailed Description
The preparation process of the present invention is further illustrated by the following specific examples.
Example 1
(1) Preparing nano material dispersion slurry: according to the mass parts, 10 parts of graphene powder, 50 parts of 128 epoxy resin, 8 parts of KYC-913 nano hyper-dispersant, 20 parts of 622 butanediol diglycidyl ether (active diluent), 3 parts of Z-6040 silane coupling agent, 3 parts of DHL-1 conductive carbon black, 5 parts of CHX-100 liquid nitrile butadiene rubber (ETBN) and 2 parts of SD-1 organic bentonite are mixed and then added into a closed high-energy ball mill with an ultrasonic auxiliary device; adding a certain amount of stainless steel grinding balls with different grades (referring to the grinding material ratio provided by an equipment manufacturer) into a ball milling tank, sealing the ball milling tank, starting an ultrasonic-assisted high-energy solid-liquid ball mill, continuously milling for 3 hours, stopping the ball milling machine, opening a material taking valve at the top of the tank, inserting a suction pipe into a material taking hole, taking out a small amount of slurry, and performing particle size detection and separation by using a nano laser particle sizerAnalysis, e.g. particle size D90The nano-particle size does not reach the nano-particle size range (10-100 nm), the ball milling is continued for 1 hour, and the machine is stopped for sampling detection until the particle size D90And (3) completely reaching 10-100 nm, cooling and discharging to obtain the nano material dispersion slurry.
(2) Preparation of normal temperature curing type bi-component paint: according to the mass parts, 15 parts of nano material dispersion slurry, 15 parts of nano organic titanium polymer (TPP-I, provided by Guangdong Jianxi surface engineering technology Co., Ltd.), 20 parts of 128 epoxy resin, 10 parts of CYH-277 or 622 epoxy active diluent, 0.5 part of FR-0516 wetting dispersant, 0.5 part of BYK-052 defoaming agent, 0.5 part of BYK-306 flatting agent, 1 part of Y200 fumed silica, 0.5 part of SD-1 organic bentonite and 40 parts of 800-mesh zinc powder are mixed and dispersed uniformly under the action of high shearing force to prepare a component A of the metal welding seam anti-corrosion protective agent coating material, and the component A is packaged by a 1kg or 4kg tank. The component B is a curing agent, commercial TE-80 or BS-1668 low-viscosity solvent-free modified amine is selected as the curing agent, the mass ratio of the component A to the component B is = 10: 1(wt), and the component B can be packaged into 0.25kg or 1kg relative to the component A and canned.
Example 2
(1) Preparing nano material dispersion slurry: mixing 5 parts of graphene powder, 5 parts of LG carbon nanotube, 20 parts of 128 epoxy resin, 10 parts of CYH-277 epoxy active toughening diluent, 8 parts of KYC-913 nano hyper-dispersant, 3 parts of Z-6040 silane coupling agent, 3 parts of DHL-1 conductive carbon black, 5 parts of CHX-100(ETBN) liquid nitrile rubber and 2 parts of SD-1 organic bentonite according to parts by mass, premixing the nano powder and resin bonding liquid under the action of high shear force, fully dispersing, and carrying out grading grinding dispersion after the phenomenon of 'agglomeration' does not exist; selecting bead mills with different filtering gaps and abrasive grain sizes, and grinding in series, wherein the specific method comprises the following steps: the rough grinding adopts 2 rod pin type bead mills connected in series for grinding, and the fine grinding adopts 2 nanometer bead mills connected in series for grinding. The particle size range of the grinding zirconium beads selected for coarse grinding is 0.8-1.2 mm, and the gap of the filter element is 0.6-1.0 mm; the grain size range of the grinding zirconium beads selected for fine grinding is 0.3-0.6 mm, and the gap of the filter element is 0.1-0.5 mm.
During the coarse grinding process, due to the large specific surface area of the nano material, the slurry viscosity is not fully dispersedThe particle size is larger, the nano powder particles are gradually dispersed in the liquid material along with the step-by-step fine grinding, the particle surfaces are coated by the nano dispersing agent to form a corona layer, the viscosity of the nano slurry is gradually reduced to become thin and thick, at the moment, a nano laser particle size analyzer can be used for sampling to carry out particle size detection and analysis, if the particle size does not reach a nanocrystallization range (10-100 nm), the grinding is continued and the sampling detection is continuously carried out until the particle size D reaches a nanocrystallization range90Completely reaches the nano-scale range, and can be cooled and discharged to obtain the nano-material dispersion slurry.
(2) Preparation of normal temperature curing type bi-component paint: the same as in example 1.
Example 3
(1) Preparing nano material dispersion slurry with hydroxyl functional groups: according to the mass parts, 10 parts of graphene powder, 25 parts of YP-50 polyphenolic oxygen resin (PKHC), 20 parts of 3-aminopropyl trihydroxysilane (active diluent), 15 parts of ZoldineRD-20 dioxazolidine, 10 parts of KYC-9201 nanometer hyper-dispersant, 3 parts of Z-6040 silane coupling agent, 3 parts of DHL-1 conductive carbon black, 7 parts of CHX-100 liquid nitrile butadiene rubber (ETBN) and 2 parts of SD-1 organic bentonite are mixed and then added into a closed high-energy ball mill with an ultrasonic auxiliary device; adding certain amount of stainless steel grinding balls with different grades (referring to grinding material ratio provided by equipment manufacturer) into a ball milling tank, sealing the ball milling tank, starting an ultrasonic-assisted high-energy solid-liquid ball mill, continuously milling for 3 hours, stopping the ball milling machine, opening a material taking valve at the top of the tank, inserting a suction pipe into a material taking hole, taking out a small amount of slurry, and performing particle size detection and analysis by using a nano laser particle sizer, such as particle size D90The nano-particle size does not reach the nano-particle size range (10-100 nm), the ball milling is continued for 1 hour, and the machine is stopped for sampling detection until the particle size D90Completely reaching 10-100 nm, cooling, and discharging to obtain nano material dispersion slurry;
(2) preparation of normal temperature curing type bi-component paint: according to the mass parts, 15 parts of nano material dispersion slurry, 20 parts of F420 polyaspartic acid ester resin, 15 parts of nano organic titanium polymer TPP-II (provided by Guangdong Jianxi surface engineering technology Co., Ltd.), 20 parts of 3-aminopropyl trihydroxy silane (active diluent), 0.5 part of FR-0516 wetting dispersant, 0.5 part of BYK-052 defoamer, 0.5 part of BYK-306 flatting agent, 1 part of Y200 fumed silica, 0.5 part of SD-1 organic bentonite and 40 parts of 800-mesh zinc powder are mixed and dispersed uniformly under the action of high shearing force to prepare a component A of the metal welding seam anti-corrosion protective agent coating material, and the component A is packaged by a 1kg or 4kg tank. The B group is a curing agent, commercial N3390 or N-75 polyisocyanate is selected as the curing agent, the preparation mass ratio of the A group to the B group = 10: 1(wt), and the B group can be packaged into 0.25kg or 1kg of cans relative to the A group.
Example 4
(1) Preparing nano material dispersion slurry: mixing 5 parts of graphene powder, 5 parts of LG carbon nanotube CNT, 25 parts of YP-50 polyphenoxy resin (PKHC), 20 parts of 3-aminopropyl trihydroxy silane, 15 parts of ALT-202 bisoxazolidine, 10 parts of KYC-9201 nano hyper-dispersant, 5 parts of CHX-100(ETBN) liquid nitrile rubber, 3 parts of Z-6040 silane coupling agent, 3 parts of DHL-1 conductive carbon black and 2 parts of SD-1 organic bentonite according to parts by mass, premixing the nano powder and resin bonding liquid under the action of high shear force, fully dispersing, and carrying out graded grinding and dispersion after no 'agglomeration' phenomenon exists; and (4) selecting bead mills with different filtering gaps and abrasive grain sizes, and grinding in series. The specific method comprises the following steps: coarse grinding (2 pin bead mills in series) → fine grinding (2 nano bead mills in series). The particle size range of the grinding zirconium beads selected for coarse grinding is 0.8-1.2 mm, and the gap of the filter element is 0.6-1.0 mm; the grain size range of the grinding zirconium beads selected for fine grinding is 0.3-0.6 mm, and the gap of the filter element is 0.1-0.5 mm.
(2) Preparation of normal temperature curing type bi-component paint: the same as in example 3.
Examples 1 and 2 the nanomaterial dispersion slurry obtained in step (1) has a functional slurry with epoxy functional groups in the carrier; examples 3 and 4 the nanomaterial dispersion slurry obtained in step (1) has a functional slurry with hydroxyl functional groups in the carrier. The role of these two slurries in practical applications is quite different.
Example 5
(1) Preparing nano material dispersion slurry: the same as in example 3;
(2) preparation of thermosetting one-component coating: according to the mass parts, 15 parts of nano material dispersion slurry, 20 parts of F420 polyaspartic acid ester resin, 15 parts of nano organic titanium polymer TPP-II, 12 parts of 3-aminopropyl trihydroxy silane, 0.5 part of FR-0516 wetting dispersant, 0.5 part of BYK-052 defoamer, 0.5 part of BYK-306 flatting agent, 1 part of Y200 fumed silica, 0.5 part of SD-1 organic bentonite and 40 parts of 800-mesh zinc powder are added, 8 parts of 5747 fully methylated amino resin is used as a latent curing agent, and the mixture is uniformly dispersed under the action of high shear force to prepare the thermosetting single-component coating. The drying and curing temperature condition during coating is 150 ℃/20-30 minutes. The product is suitable for industrial construction.
Example 6
(1) Preparing nano material dispersion slurry: the same as example 4;
(2) preparation of thermosetting one-component coating: the same as in example 5.

Claims (9)

1. A titanium-based high-molecular alloy weld joint protection coating functional material is characterized by being a composite functional material which is mainly formed by taking a nano organic titanium polymer as a base material, taking nano material dispersion slurry as a functional filler, taking high-molecular resin as an auxiliary film forming material, taking active zinc powder as a sacrificial anode, taking an active diluent as a diluent and adding a functional auxiliary agent.
2. The preparation method of the titanium-based polymer alloy welding seam protective coating functional material according to claim 1, characterized by comprising the following steps:
(1) preparing nano material dispersion slurry: mixing 10-15 parts of nano conductive agent powder, 45-55 parts of polymer resin, 15-25 parts of active diluent, 1-5 parts of conductive pigment carbon black, 5-10 parts of nano dispersant, 1-5 parts of silane coupling agent, 5-10 parts of liquid nitrile rubber and 1-5 parts of organic bentonite in parts by mass, and performing ball milling or graded grinding to fully disperse the mixture to obtain nano material dispersion slurry;
the nano conductive agent powder is one or a mixture of graphene and a carbon nano tube; the polymer resin is at least one of epoxy resin, phenoxy resin, polyester resin, acrylic resin and polyaspartic acid ester resin; the reactive diluent is at least one of glycidyl ether, glycidyl ester, hydroxyl silane and oxazolidine;
(2) preparation of normal temperature curing type bi-component paint: dispersing and mixing uniformly 15-20 parts of nano organic titanium polymer, 20-25 parts of high polymer resin, 5-10 parts of nano material dispersion slurry with solid content of 10%, 5-10 parts of active diluent, 35-45 parts of active zinc powder and 3-5 parts of functional additive to obtain a coating, wherein the coating is used as a component A; selecting a polymer capable of reacting with a high molecular resin functional group as a curing agent, and setting the polymer as a component B;
the nano organic titanium polymer is TPP-I nano organic titanium polymer or TPP-II nano organic titanium polymer; the high polymer resin is resin with epoxy group, hydroxyl group or carbamide group; the curing agent is aliphatic or aromatic organic polyamine, modified amine or isocyanate polymer; the functional assistant comprises a wetting dispersant, a defoaming agent, a leveling agent, an adhesion promoter and a thixotropic anti-settling agent.
3. The preparation method of the titanium-based polymer alloy welding seam protection functional coating material as claimed in claim 2, wherein the ball milling is performed for 3-4 hours by using a high-energy ball mill with an ultrasonic auxiliary device, and the particle size D of the slurry after ball milling is determined90Reaching 10-100 nm.
4. The method for preparing the titanium-based polymer alloy welding seam protection functional coating material as claimed in claim 2, wherein the step grinding is performed by using a nano bead mill, the nano material and the resin bonding liquid are premixed and fully dispersed under the action of high shearing force, after the phenomenon of 'agglomeration' does not exist, coarse grinding and fine grinding are performed, and the particle size D of the ground slurry is9010-100 nm; the particle size range of the grinding zirconium beads selected for coarse grinding is 0.8-1.2 mm, and the gap of the filter element is 0.6-1.0 mm; the grain size range of the grinding zirconium beads selected for fine grinding is 0.3-0.6 mm, and the gap of the filter element is 0.1-0.5 mm.
5. The preparation method of the titanium-based polymer alloy welding seam protective coating functional material according to claim 1, characterized by comprising the following steps:
(1) preparing nano material dispersion slurry: mixing 5-15 parts of nano conductive agent powder, 15-25 parts of polymer resin, 30-40 parts of reactive diluent, 1-5 parts of conductive pigment carbon black, 5-10 parts of nano dispersant, 1-5 parts of silane coupling agent, 3-8 parts of liquid nitrile rubber and 1-5 parts of thixotropic thickener in parts by mass, and performing ball milling or graded grinding for full dispersion to obtain nano material dispersion slurry;
the nano conductive agent powder is one or a mixture of graphene and a carbon nano tube; the polymer resin is at least one of epoxy resin, phenoxy resin, polyester resin, acrylic resin and polyaspartic acid ester resin; the active diluent is at least one of glycidyl ether, glycidyl ester, hydroxyl silane and oxazolidine;
(2) preparation of thermosetting one-component coating: according to the mass parts, adding 5-10 parts of latent curing agent into 15-20 parts of nano organic titanium precursor polymer, 20-25 parts of high molecular resin, 5-10 parts of nano material dispersion slurry with solid content of 10%, 5-10 parts of reactive diluent, 35-45 parts of active zinc powder and 3-5 parts of functional additive, and dispersing and mixing uniformly to obtain single-component thermosetting coating;
the nano organic titanium polymer is TPP-I nano organic titanium polymer or TPP-II nano organic titanium polymer; the high polymer resin is resin with epoxy group, hydroxyl group or carbamide group; when the high molecular resin is epoxy resin, dicyandiamide, methylimidazole or acid anhydride is selected as a latent curing agent; when the high molecular resin is hydroxyl-containing resin, blocked isocyanate or amino resin is selected as a latent curing agent; the functional additives are wetting dispersing agents, defoaming agents, flatting agents, adhesion promoters and thixotropic thickening agents.
6. The preparation method of the titanium-based polymer alloy welding seam protection functional coating material according to claim 5, characterized in that the ball milling is performed for 3-4 hours by using a high-energy ball mill with an ultrasonic auxiliary device, and the particle size D of the slurry after ball milling is90Reaching 10-100 nm.
7. The method for preparing the titanium-based polymer alloy welding seam protection functional coating material as claimed in claim 5, wherein the step grinding is performed by using a nano bead mill, the nano material and the resin bonding liquid are premixed and fully dispersed under the action of high shearing force, after the phenomenon of 'agglomeration' is avoided, coarse grinding and fine grinding are performed, and the particle size D of the ground slurry is9010-100 nm; the particle size range of the grinding zirconium beads selected for coarse grinding is 0.8-1.2 mm, and the gap of the filter element is 0.6-1.0 mm; the grain size range of the grinding zirconium beads selected for fine grinding is 0.3-0.6 mm, and the gap of the filter element is 0.1-0.5 mm.
8. An application method of the normal temperature curing type bi-component paint prepared by the preparation method of the titanium-based polymer alloy welding line protection coating functional material of claim 2 is characterized by comprising the following steps:
(1) surface treatment of the bead steel: after the welding line is polished to be flat, performing shot blasting or sand blasting treatment, wherein the roughness is required to meet ISORu 30-40 mu m, and the shot blasting grade is required to meet ISO Sa2.5 grade quality standard;
(2) coating of normal temperature curing type two-component coating: determining the mass ratio of the component A to the component B through chemical calculation, weighing and mixing the A, B components according to the mass ratio, uniformly stirring, coating by adopting a blade coating or brush coating mode, coating a wet film with the thickness of 100-120 mu m on the upper side and the lower side of a weld joint and the weld joint, and drying.
9. A method for applying a thermosetting type single-component coating prepared by the method for preparing the titanium-based polymer alloy welding line protection coating functional material of claim 5 is characterized by comprising the following steps:
(1) surface treatment of the bead steel: after the welding line is polished to be flat, performing shot blasting or sand blasting treatment, wherein the roughness is required to meet ISORu 30-40 mu m, and the shot blasting grade is required to meet ISO Sa2.5 grade quality standard;
(2) application of the thermosetting one-component coating: coating a wet film with the thickness of 100-120 mu m on the upper side, the lower side and the welding seam of the thermosetting single-component coating by adopting blade coating or brush coating, and drying and curing to form a film; the drying and curing temperature is 100-180 ℃, and the curing time is 20-30 minutes.
CN202010394339.XA 2020-05-11 2020-05-11 Titanium-based polymer alloy welding seam protection coating functional material and preparation method thereof Pending CN111635657A (en)

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