High-hardness high-gloss waterborne epoxy ester antirust varnish and preparation method thereof

Abstract

The invention relates to the technical field of oxygen ester coatings, in particular to high-hardness and high-gloss waterborne epoxy ester antirust varnish and a preparation method thereof. The water-based paint comprises the following components in percentage by weight: 40%-45% of epoxy ester resin, 1%-10% of rosin resin, 1%-5% of a cosolvent, 0.8%-1.0% of a drier, 0.3%-0.6% of a wetting agent, 0.2%-0.5% of a defoaming agent, 0.1%-0.6% of a flash rust inhibitor, 0.1%-0.5% of a pH regulator, 0.8%-1.5% of a thickening agent and the balance of deionized water. The rosin resin is used for modifying the waterborne epoxy ester, so that the initial hardness, the wear resistance, the adhesion resistance and the gloss of a paint film are remarkably improved, and the rosin modified waterborne epoxy ester coating with excellent comprehensive performance is prepared.

Description

Technical Field

[0001] The invention relates to the technical field of epoxy ester coatings, and in particular to a high-hardness and high-gloss water-based epoxy ester anti-rust varnish and a preparation method thereof. Background Art

[0002] At present, the water-based anti-corrosion and anti-rust coatings on the surface of steel pipes are mainly water-based epoxy ester coatings and water-based alkyd coatings. Water-based epoxy ester coatings are made of water-based epoxy ester resins as the base material, with pigments, fillers, additives, and a certain process. Water-based epoxy ester coatings have the advantages of good corrosion resistance and good adhesion. The disadvantage is that after low-temperature baking or self-drying, the initial hardness of water-based epoxy ester coatings is low, and the paint film is soft and sticky. As a result, the steel pipes painted with water-based epoxy ester coatings are easily adhered and peeled during the transmission, transfer, hoisting, and transportation on the coating line, causing the integrity of the paint film to be destroyed, which seriously affects the anti-corrosion and anti-rust performance of the paint film.

[0003] Chinese invention patent CN103756521A discloses a water-based acrylic modified epoxy ester emulsion anti-corrosion coating. The anti-corrosion coating has good mechanical stability, high hardness, and excellent anti-corrosion performance. It can be used to meet the needs of automotive parts such as gearboxes, axles, and automobile chassis for water-based anti-corrosion coatings. However, it does not solve the problems of low initial hardness of the paint film, soft paint film, and stickiness. Summary of the invention

[0004] The first aspect of the present invention provides a high-hardness and high-gloss water-based epoxy ester anti-rust varnish, which comprises, by weight percentage, 40-45% of epoxy ester resin, 1-10% of rosin resin, 1-5% of cosolvent, 0.8-1.0% of drying agent, 0.3-0.6% of wetting agent, 0.2-0.5% of defoaming agent, 0.1-0.6% of anti-flash rust agent, 0.1-0.5% of pH regulator, 0.8-1.5% of thickener, and the balance is made up of deionized water.

[0005] The content of the rosin resin in the varnish is 1-5wt%.

[0006] Preferably, the content of the rosin resin in the varnish is 1.5-5wt%.

[0007] Further preferably, the content of the rosin resin in the varnish is 1.5-4.7 wt %.

[0008] The applicant has found that the problem of low initial hardness of waterborne epoxy ester resin paint film can be solved by using a compound of epoxy ester resin and rosin resin. It may be that the three-ring skeleton structure in the rosin resin plays an anchoring role on the chain segments of the epoxy ester resin. Further research has found that the content of rosin resin in the varnish is 1-5wt%. The adhesion, wear resistance and glossiness of the coating can be improved at the same time. It may be that the interaction of hydrogen bonds in the rosin resin and the epoxy ester resin reduces the pores between the chain segments, thereby improving the flatness of the paint film surface.

[0009] The epoxy ester resin includes water-based acrylic modified epoxy ester.

[0010] Preferably, the epoxy ester resin includes one of the following models: GS-5000C of Changzhou Guangshu Chemical and MT-HYZ03 of Guangdong Badfu.

[0011] The co-solvent includes one or more of ethanol, propylene glycol methyl ether, ethylene glycol butyl ether, propylene glycol butyl ether, propylene glycol phenyl ether, dipropylene glycol methyl ether, and dipropylene glycol butyl ether.

[0012] The wetting agent includes a non-ionic silicone wetting agent.

[0013] Preferably, the non-ionic silicone wetting agent includes at least one of the following models of Umet Corporation: YMT-328, YMT-320, and YMT-245.

[0014] The pH adjuster includes an organic amine.

[0015] Preferably, the pH adjuster includes at least one of Sears Chemical Ammonia, Dow Chemical AMP-95, and Wacker BS168;

[0016] The drying agent is selected from at least one of the following models: Octa Soligen Zirconium 10aqua, Octa Soligen Zinc 10aqua, Octa Soligen Cobalt 7aqua, Octa Soligen 421aqua, Borchers Dry 0347aqua, Octa Soligen 123aqua produced by OMG, HLD061, FED 083 produced by Shanghai Changfeng Chemical Plant, VXW4940, VXW6206 produced by Allnex.

[0017] The defoaming agent is selected from one or more of BYK-022 and BYK-024 produced by German BYK Chemical Company or Tego Foamex 810 and Tego Foamex 845 produced by Tego Chemical Company.

[0018] The anti-flash rust agent is selected from at least one of the following models: Hemmings FA-179, H10, Qingdao Enze Chemical CK-25, Qingdao Enze Chemical CK-34, Changzhou Ruike Air Chemical RH-MH-45, Shanghai Jetta New Materials Co., Ltd. JD-5385, JD-50, and Yihua High-tech Technology Co., Ltd. ARCH 100S.

[0019] The thickener includes a polyurethane thickener.

[0020] Preferably, the polyurethane thickener is selected from at least one of the following models: Dow RM-8W, RM-2020, Wanhua U601, and U505.

[0021] The weight ratio of the drying agent to the wetting agent is 1:(0.3-0.6).

[0022] Preferably, the weight ratio of the drying agent to the wetting agent is 1:0.3.

[0023] The weight ratio of the anti-flash rust agent to the thickener is 1:(6-10).

[0024] Preferably, the weight ratio of the flash rust inhibitor to the thickener is 1:8.

[0025] The second aspect of the present invention provides a method for preparing a high-hardness and high-gloss water-based epoxy ester anti-rust varnish, comprising the following steps: uniformly dispersing rosin resin and a cosolvent to obtain a rosin dispersion slurry; mixing the epoxy ester resin with a pH regulator, dispersing the mixture in deionized water to obtain an epoxy ester dispersion liquid; uniformly mixing the rosin dispersion slurry and the epoxy ester dispersion liquid, and then adding a drying agent, a wetting agent, a defoaming agent, an anti-flash rust agent and a thickener to obtain a water-based epoxy ester anti-rust varnish.

[0026] The weight ratio of the rosin resin to the co-solvent is 1:(0.8-1.2).

[0027] Preferably, the weight ratio of the rosin resin to the co-solvent is 1:(0.8-1).

[0028] Beneficial Effects

[0029] 1. The problem of low initial hardness of water-based epoxy ester resin paint film is solved by using a compound of epoxy ester resin and rosin resin.

[0030] 2. The content of rosin resin in the varnish is 1-5wt%. It can improve the adhesion, wear resistance and glossiness of the coating at the same time.

[0031] 3. The weight ratio of the drying agent to the wetting agent is 1:(0.3-0.6), which can further improve the anti-corrosion and anti-rust properties of the paint film.

[0032] 4. The water-based epoxy ester anti-rust varnish prepared in this application can meet the anti-corrosion and anti-rust quality indicators of the steel pipe surface.

[0033] 5. The water-based epoxy ester anti-rust varnish prepared in the present application solves the problem of reducing the damage to the integrity of the paint film caused by adhesion and bumping of the paint film during chain bed transmission, hoisting, bundling, transshipment, and transportation of steel pipes after coating, and can meet the requirements of actual coating construction operations such as rapid offline, bundling, hoisting, stacking, and palletizing of industrial large-scale production coating lines. DETAILED DESCRIPTION

[0034] Example 1

[0035] A high-hardness and high-gloss water-based epoxy ester anti-rust varnish, the components of which are, by weight percentage, 43% of epoxy ester resin (Changzhou Guangshu Chemical, GS-5000C), 1.5% of rosin resin (Guangxi Dinghong Resin, HAR), 1.5% of cosolvent (propylene glycol methyl ether), 1.0% of drying agent (Shanghai Changfeng Chemical HLD061), 0.3% of wetting agent (Beijing Youmei Special, YMT-320), 0.2% of defoaming agent (Di Gao 845), 0.1% of anti-flash rust agent (Hemmings FA-179), 0.1% of pH regulator (N,N-dimethylethanolamine), 0.8% of thickener (Dow RM-8W), and the balance is made up of deionized water.

[0036] The invention discloses a method for preparing a high-hardness and high-gloss water-based epoxy ester anti-rust varnish, which comprises the following steps: uniformly dispersing rosin resin and a cosolvent to obtain a rosin dispersion slurry; mixing the epoxy ester resin with a pH regulator, dispersing the mixture in deionized water to obtain an epoxy ester dispersion liquid; uniformly mixing the rosin dispersion slurry and the epoxy ester dispersion liquid, and then adding a drying agent, a wetting agent, a defoaming agent, an anti-flash rust agent and a thickener to obtain the water-based epoxy ester anti-rust varnish.

[0037] Example 2

[0038] A high-hardness and high-gloss water-based epoxy ester anti-rust varnish, the components of which are, by weight percentage, 43% of epoxy ester resin (Changzhou Guangshu Chemical, GS-5000C), 2.4% of rosin resin (Guangxi Dinghong Resin, HAR), 2.4% of cosolvent (propylene glycol methyl ether), 1.0% of drying agent (Shanghai Changfeng Chemical HLD061), 0.3% of wetting agent (Beijing Youmei Special, IMT-320), 0.2% of defoaming agent (Di Gao 845), 0.1% of anti-flash rust agent (Hemmings FA-179), 0.1% of pH regulator (N,N-dimethylethanolamine), 0.8% of thickener (Dow RM-8W), and the balance is made up of deionized water.

[0039] The invention discloses a method for preparing a high-hardness and high-gloss water-based epoxy ester anti-rust varnish, which comprises the following steps: uniformly dispersing rosin resin and a cosolvent to obtain a rosin dispersion slurry; mixing the epoxy ester resin with a pH regulator, dispersing the mixture in deionized water to obtain an epoxy ester dispersion liquid; uniformly mixing the rosin dispersion slurry and the epoxy ester dispersion liquid, and then adding a drying agent, a wetting agent, a defoaming agent, an anti-flash rust agent and a thickener to obtain the water-based epoxy ester anti-rust varnish.

[0040] Example 3

[0041] A high-hardness and high-gloss water-based epoxy ester anti-rust varnish, the components of which are, by weight percentage, 43% of epoxy ester resin (Changzhou Guangshu Chemical, GS-5000C), 4.7% of rosin resin (Guangxi Dinghong Resin, HAR), 4.7% of cosolvent (propylene glycol methyl ether), 1.0% of drying agent (Shanghai Changfeng Chemical HLD061), 0.3% of wetting agent (Beijing Youmei Special, IMT-320), 0.2% of defoaming agent (Di Gao 845), 0.1% of anti-flash rust agent (Hemmings FA-179), 0.1% of pH regulator (N,N-dimethylethanolamine), 0.8% of thickener (Dow RM-8W), and the balance is made up of deionized water.

[0042] The invention discloses a method for preparing a high-hardness and high-gloss water-based epoxy ester anti-rust varnish, which comprises the following steps: uniformly dispersing rosin resin and a cosolvent to obtain a rosin dispersion slurry; mixing the epoxy ester resin with a pH regulator, dispersing the mixture in deionized water to obtain an epoxy ester dispersion liquid; uniformly mixing the rosin dispersion slurry and the epoxy ester dispersion liquid, and then adding a drying agent, a wetting agent, a defoaming agent, an anti-flash rust agent and a thickener to obtain the water-based epoxy ester anti-rust varnish.

[0043] Example 4

[0044] A high-hardness and high-gloss water-based epoxy ester anti-rust varnish, which comprises, by weight percentage, 43% of epoxy ester resin (MT-HYZ03, Guangdong Baderfu), 2.4% of rosin resin (HAR, Guangxi Dinghong Resin), 2.4% of cosolvent (propylene glycol methyl ether), 1.0% of drying agent (HLD061, Shanghai Changfeng Chemical), 0.3% of wetting agent (IMT-320, Beijing Youmei Special), 0.2% of defoaming agent (Di Gao 845), 0.1% of anti-flash rust agent (Hemmings FA-179), 0.1% of pH regulator (N,N-dimethylethanolamine), 0.8% of thickener (Dow RM-8W), and the balance is made up of deionized water.

[0045] The invention discloses a method for preparing a high-hardness and high-gloss water-based epoxy ester anti-rust varnish, which comprises the following steps: uniformly dispersing rosin resin and a cosolvent to obtain a rosin dispersion slurry; mixing the epoxy ester resin with a pH regulator, dispersing the mixture in deionized water to obtain an epoxy ester dispersion liquid; uniformly mixing the rosin dispersion slurry and the epoxy ester dispersion liquid, and then adding a drying agent, a wetting agent, a defoaming agent, an anti-flash rust agent and a thickener to obtain the water-based epoxy ester anti-rust varnish.

[0046] Comparative Example 1

[0047] The invention discloses a water-based epoxy ester anti-rust varnish, which comprises the following components by weight percentage: 43% of epoxy ester resin (GS-5000C, produced by Changzhou Guangshu Chemical), 1.5% of cosolvent (propylene glycol methyl ether), 1.0% of drying agent (HLD061, produced by Shanghai Changfeng Chemical), 0.3% of wetting agent (IMT-320, produced by Beijing Youmei Special), 0.2% of defoaming agent (Digo 845), 0.1% of anti-flash rust agent (Hemmings FA-179), 0.1% of pH regulator (N,N-dimethylethanolamine), 0.8% of thickener (Dow RM-8W), and the balance is made up of deionized water.

[0048] The invention discloses a method for preparing a water-based epoxy ester anti-rust varnish, which comprises the following steps: mixing an epoxy ester resin with a pH regulator, dispersing the mixture in deionized water to obtain an epoxy ester dispersion, and then adding a cosolvent, a drying agent, a wetting agent, a defoaming agent, an anti-flash rust agent and a thickener to obtain the water-based epoxy ester anti-rust varnish.

[0049] Comparative Example 2

[0050] The invention discloses a water-based epoxy ester anti-rust varnish, which comprises the following components by weight percentage: 43% of epoxy ester resin (MT-HYZ03, Guangdong Baderfu), 1.5% of cosolvent (propylene glycol methyl ether), 1.0% of drying agent (HLD061, Shanghai Changfeng Chemical), 0.3% of wetting agent (IMT-320, Beijing Youmei Special), 0.2% of defoaming agent (Di Gao 845), 0.1% of anti-flash rust agent (Hemmings FA-179), 0.1% of pH regulator (N,N-dimethylethanolamine), 0.8% of thickener (RM-8W, Dow), and the balance is made up of deionized water.

[0051] The invention discloses a method for preparing a water-based epoxy ester anti-rust varnish, which comprises the following steps: mixing an epoxy ester resin with a pH regulator, dispersing the mixture in deionized water to obtain an epoxy ester dispersion, and then adding a cosolvent, a drying agent, a wetting agent, a defoaming agent, an anti-flash rust agent and a thickener to obtain the water-based epoxy ester anti-rust varnish.

[0052] Performance testing methods and data

[0053] The anti-rust varnishes prepared in the examples and comparative examples were subjected to performance tests, and the test data are listed in Table 1.

[0054] Table 1

[0055]

[0056] From the data in Table 1, it can be seen that adding 1.5% to 5% of rosin resin to the epoxy ester coating formula can increase the gloss of the paint film by 3° to 8°; it can significantly improve the initial hardness of the paint film. Adding 1.5% to 5% of rosin resin can increase the 48h hardness of the paint film by 0.03 to 0.08.

Claims

1. A high-hardness and high-gloss water-based epoxy ester anti-rust varnish, characterized in that: Calculated by weight percentage, the components include: 40-45% epoxy ester resin, 1-10% rosin resin, 1-5% cosolvent, 0.8-1.0% drying agent, 0.3-0.6% wetting agent, 0.2-0.5% defoamer, 0.1-0.6% anti-flash rust agent, 0.1-0.5% pH regulator, 0.8-1.5% thickener, and deionized water makes up the balance.

2. The high-hardness and high-gloss water-based epoxy ester anti-rust varnish according to claim 1, characterized in that: The content of the rosin resin in the varnish is 1-5wt%.

3. The high-hardness and high-gloss water-based epoxy ester anti-rust varnish according to claim 1 or 2, characterized in that: The epoxy ester resin includes water-based acrylic modified epoxy ester.

4. The high-hardness and high-gloss water-based epoxy ester anti-rust varnish according to claim 3, characterized in that: The co-solvent includes one or more of ethanol, propylene glycol methyl ether, ethylene glycol butyl ether, propylene glycol butyl ether, propylene glycol phenyl ether, dipropylene glycol methyl ether, and dipropylene glycol butyl ether.

5. The high-hardness and high-gloss water-based epoxy ester anti-rust varnish according to claim 4, characterized in that: The wetting agent includes a non-ionic silicone wetting agent.

6. The high-hardness and high-gloss water-based epoxy ester anti-rust varnish according to claim 5, characterized in that: The thickener includes a polyurethane thickener.

7. The high-hardness and high-gloss water-based epoxy ester anti-rust varnish according to claim 6, characterized in that: The weight ratio of the drying agent to the wetting agent is 1:(0.3-0.6).

8. The high-hardness and high-gloss water-based epoxy ester anti-rust varnish according to claim 7, characterized in that: The weight ratio of the anti-flash rust agent to the thickener is 1:(6-10).

9. A method for preparing the high-hardness and high-gloss water-based epoxy ester anti-rust varnish according to any one of claims 1 to 8, characterized in that: The following steps are involved: The rosin resin and the cosolvent are dispersed uniformly to obtain a rosin dispersion slurry; the epoxy ester resin and the pH adjuster are mixed and dispersed in deionized water to obtain an epoxy ester dispersion liquid; the rosin dispersion slurry and the epoxy ester dispersion liquid are mixed uniformly, and then a drying agent, a wetting agent, a defoaming agent, an anti-flash rust agent and a thickener are added to obtain a water-based epoxy ester anti-rust varnish.

10. The method for preparing the high-hardness and high-gloss water-based epoxy ester anti-rust varnish according to claim 9, characterized in that: The weight ratio of the rosin resin to the co-solvent is 1:(0.8-1.2).

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