Preparation method of rust-proof corrosion-resistant water-based industrial paint for steel structure

Abstract

The invention discloses a preparation method of rust-proof and corrosion-resistant water-based industrial paint for a steel structure, and belongs to the technical field of steel structure paints.The preparation method comprises the steps that modified water-based alkyd resin is adopted as a raw material, epoxy resin is grafted to the alkyd resin through ring-opening reaction of epoxidized natural rubber and carboxyl of the alkyd resin, and the rust-proof and corrosion-resistant water-based industrial paint for the steel structure is obtained; according to the present invention, the flexibility of the steel structure rust-proof corrosion-resistant water-based industrial paint is improved, the use amount of the styrene-acrylic emulsion can be reduced through the modification of the modified water-based alkyd resin, and on the premise of cost reduction, the good performance of the paint can be maintained, and the corrosion resistance of the paint can be improved; zinc oxide modified aluminum tripolyphosphate is higher in applicability and good in anti-rust performance in the water-based industrial paint, zinc oxide has a certain curing promoting effect, and a proper amount of auxiliaries such as anti-corrosion filler and a flash-rust inhibitor are matched, so that the water-based paint is good in wettability, anti-rust performance, quick-drying performance and constructability to a base material, and the water-based paint is high in corrosion resistance and corrosion resistance. And the water-resistant paint is suitable for being applied to various factory steel structures and workpieces.

Description

Technical Field

[0001] The invention belongs to the technical field of steel structure coatings, in particular to a method for preparing rust-proof and corrosion-resistant water-based industrial paint for steel structures. Background Art

[0002] In the past, my country's solvent-based rust-proof paints were of a single variety, containing a large amount of organic solvents and heavy metals and other rust-proof pigments. At present, solvent-free, environmentally friendly rust-free anti-corrosion paints are being actively developed to overcome the shortcomings of solvent-based rust-proof paints, which is also one of the current research hotspots. Water-based inorganic zinc-rich paints are widely used in the field of heavy corrosion protection of steel structures due to their low VOC (volatile organic compounds) and excellent weather resistance, but inorganic paints generally have poor adhesion and flexibility, and flash rust easily occurs when the dispersion medium water contacts the steel structure. In addition, the toughness of steel structure paints has always been a big problem. The toughness of traditional paints used in steel structures is poor. Although the anti-corrosion ability of steel structures can be increased to a certain extent during the normal use stage of the structure, under extreme conditions, such as earthquakes, explosions and other impact loads, they will peel off from the surface of the steel structure, exposing the steel structure directly, seriously affecting the safety of the structure. Those skilled in the art are in urgent need of developing a method for preparing a rust-proof and corrosion-resistant water-based industrial paint for steel structures to meet existing usage needs and performance requirements. Summary of the invention

[0003] In view of the above problems, the present invention aims to provide a method for preparing a rust-proof and corrosion-resistant water-based industrial paint for steel structures.

[0004] The present invention is achieved through the following technical solutions: A method for preparing a rust-proof and corrosion-resistant water-based industrial paint for steel structures comprises the following steps: (1) Preparation of modified waterborne alkyd resin: by weight, add 10-12 parts of epoxidized soybean oil, 40-42 parts of linseed oil, 15-18 parts of trimethylolpropane, and 30-35 parts of epoxidized natural rubber into a reactor, heat to 230-240°C for alcoholysis, and alcoholyze until the epoxy value is 0 and the tolerance of 95% ethanol is 4-5, then add 15-18 parts of isophthalic acid, 0.01-0.02 parts of yellow lead, and 55-60 parts of xylene to continue the reaction. When the acid value is 20-25 mgKOH / g, the temperature is lowered to 130°C, xylene is distilled under reduced pressure, and then 30-35 parts of trimellitic anhydride are added, the temperature is raised to 160°C and kept warm. When the acid value is 40-50 mgKOH / g, the temperature is lowered to 80°C, triethylamine is added to neutralize to a pH value of 7.3-7.8, and water is added to adjust the solid content to 45-50%, thereby obtaining a modified waterborne alkyd resin. (2) The modified waterborne alkyd resin, anti-corrosion filler, and anti-flash rust agent are added while stirring. Add the premixed resin component to the styrene-acrylate emulsion, control the overtime speed at 1000~1500rpm, filter to obtain the premixed resin component, and set aside; (3) Add the leveling agent, thickener, defoamer and antioxidant to the deionized water in turn, stir and mix them thoroughly at a speed of 500~600rpm, let it stand for 2h, and then obtain the premixed auxiliary component, and set aside; (4) Batch mixing: Mix the premixed resin component and the premixed auxiliary component and add them to the water-based curing agent and stir thoroughly at a speed of 200~ 300rpm, and after filtering, a trailer anti-rust and corrosion-resistant water-based industrial paint with a solid content of 40% to 50% is obtained; in parts by weight, the styrene-acrylate emulsion is 35 to 40 parts, the modified water-based alkyd resin is 55 to 60 parts, the anti-corrosion filler is 10 to 15 parts, the anti-flash rust agent is 0.5 to 1 part, the leveling agent is 0.2 to 0.5 parts, the defoamer is 0.1 to 0.3 parts, the thickener is 0.5 to 1.5 parts, the curing agent is 15 to 20 parts, and the antioxidant is 0.5 to 1 part.

[0005] Furthermore, the epoxidation degree of the epoxidized natural rubber is 40-50%, and the ring-opening degree is 4-5%.

[0006] Furthermore, the styrene-acrylate emulsion has a solid content of 48-50%.

[0007] Furthermore, the anti-corrosion filler is zinc oxide modified aluminum tripolyphosphate, and the anti-flash rust agent is sodium nitrite or sodium benzoate.

[0008] Furthermore, the curing agent is a sulfur water dispersant.

[0009] Furthermore, the thickener is TT935 or GEL400.

[0010] Furthermore, the leveling agent is UH-420 or Y-2089.

[0011] Furthermore, the antioxidant is antioxidant FT-NOX 3036.

[0012] Furthermore, the defoaming agent is HX-2500 or Foamex 825.

[0013] The beneficial effects of the present invention are: The invention discloses a method for preparing a rust-proof and corrosion-resistant water-based industrial paint for steel structures. The raw material used is a modified water-based alkyd resin. The epoxy resin is grafted onto the alkyd resin through a ring-opening reaction between epoxidized natural rubber and the carboxyl group of the alkyd resin to obtain an epoxy natural rubber modified water-based alkyd resin, thereby improving the flexibility of the rust-proof and corrosion-resistant water-based industrial paint for steel structures. The amount of styrene acrylic emulsion can be reduced by modifying the water-based alkyd resin. Under the premise of reducing costs, the method can not only maintain its own good performance, but also zinc oxide-modified aluminum tripolyphosphate has stronger applicability in water-based industrial paint and good rust-proof performance. The zinc oxide has a certain curing-promoting effect. The method is matched with an appropriate amount of anti-corrosion fillers, anti-flash rust agents and other additives, thereby achieving a balance of various properties of the water-based paint, such as good wettability to a substrate, rust-proof performance, quick-drying property, easy construction property and water resistance. The method is suitable for application in various factory steel structures and workpieces. DETAILED DESCRIPTION

[0014] The present invention is described below with specific examples, but is not intended to be limiting of the present invention. Example 1

[0015] Raw materials: Nantong Haierma vegetable oil epoxidized soybean oil HM-01R; Wanxiang New Materials epoxidized natural rubber epoxidation degree is 40~50%, and the ring opening degree is 4~5%. Chenshi Chemical Grade 1 linseed oil; Taizhou Sunrise TL-6 styrene-acrylate emulsion solid content 50%; zinc oxide modified aluminum tripolyphosphate APZ-99, flash rust inhibitor is sodium benzoate; curing agent is sulfur water dispersant; AMI thickener GEL400; leveling agent is ADK UH-420; antioxidant FT-NOX 3036; defoamer Digao Foamex 825; Shuangji Chemical 80 sulfur water dispersant.

[0016] A method for preparing a rust-proof and corrosion-resistant water-based industrial paint for steel structures comprises the following steps: (1) Preparation of modified waterborne alkyd resin: by weight, add 10 parts of epoxidized soybean oil, 40 parts of linseed oil, 15 parts of trimethylolpropane, and 30 parts of epoxidized natural rubber into a reactor, heat to 230°C for alcoholysis, and add 15 parts of isophthalic acid, 0.01 parts of yellow lead, and 55 parts of xylene to continue the reaction. When the acid value reaches 20 mgKOH / g, cool to 130°C, distill xylene under reduced pressure, and then add 30 parts of trimellitic anhydride, heat to 160°C and keep warm. When the acid value reaches 40 mgKOH / g, cool to 80°C, add triethylamine to neutralize to pH 7.3, and add water to adjust the solid content to 45%, thereby obtaining modified waterborne alkyd resin. (2) Add the modified waterborne alkyd resin, anti-corrosion filler, and anti-rust agent while stirring. Add to styrene-acrylate emulsion, control the overtime speed at 1000rpm, filter to obtain resin premix component, and set aside; (3) add leveling agent, thickener, defoamer and antioxidant to deionized water in turn, stir and mix at a speed of 500rpm, let stand for 2h, and obtain auxiliary agent premix component, and set aside; (4) batch mixing: mix the resin premix component and the auxiliary agent premix component and add them to the water-based curing agent and stir well at a speed of 200rpm, filter to obtain trailer anti-rust and corrosion-resistant water-based industrial paint with a solid content of 40%; by weight, the styrene-acrylate emulsion 35 parts, modified water-based alkyd resin 55 parts, anti-corrosion filler 10 parts, anti-flash rust agent 0.5 parts, leveling agent 0.2 parts, defoamer 0.1 parts, thickener 0.5 parts, curing agent 15 parts, antioxidant 0.5 parts. Example 2

[0017] Raw materials: Nantong Haierma vegetable oil epoxidized soybean oil HM-01R; Wanxiang New Material epoxidized natural rubber epoxidation degree of 50%, ring opening degree of 5%. Chenshi Chemical Grade 1 linseed oil; Sunrise TL-608M styrene-acrylate emulsion solid content 48%; zinc oxide modified aluminum tripolyphosphate, flash rust inhibitor sodium nitrite; Dongtai Agricultural Chemical 80 sulfur water dispersant; thickener Rohm and Haas TT935; leveling agent is Yuanya Y-2089; antioxidant FT-NOX 3036; defoaming agent is Huaxia HX-2500.

[0018] A method for preparing a rust-proof and corrosion-resistant water-based industrial paint for steel structures comprises the following steps: (1) Preparation of modified waterborne alkyd resin: by weight, add 12 parts of epoxidized soybean oil, 42 parts of linseed oil, 18 parts of trimethylolpropane, and 35 parts of epoxidized natural rubber into a reactor, heat to 240°C for alcoholysis reaction, and add 8 parts of isophthalic acid, 0.02 parts of yellow lead, and 60 parts of xylene to continue the reaction when the epoxide value is 0 and the tolerance of 95% ethanol is 5. When the acid value reaches 25 mgKOH / g, cool to 130°C, distill xylene under reduced pressure, and then add 30-35 parts of trimellitic anhydride, heat to 160°C and keep warm. When the acid value reaches 50 mgKOH / g, cool to 80°C, add triethylamine to neutralize to pH 7.8, and add water to adjust the solid content to 50%, thereby obtaining modified waterborne alkyd resin; (2) Add modified waterborne alkyd resin, anti-corrosion filler, and anti-rust agent, and mix well. Add the premixed resin into the styrene-acrylate emulsion while stirring, control the overtime speed at 1500rpm, filter to obtain the resin premix component, and set aside; (3) add the leveling agent, thickener, defoamer and antioxidant into deionized water in turn, stir and mix them thoroughly at a speed of 600rpm, let it stand for 2h, and obtain the auxiliary agent premix component, and set aside; (4) batch mixing: mix the resin premix component and the auxiliary agent premix component and add them into the water-based curing agent and stir them thoroughly at a speed of 300rpm, filter to obtain a trailer anti-rust and corrosion-resistant water-based industrial paint with a solid content of 50%; in terms of weight, the styrene-acrylate emulsion is 40 parts, the modified water-based alkyd resin is 60 parts, the anti-corrosion filler is 15 parts, the anti-flash rust agent is 1 part, the leveling agent is 0.5 parts, the defoamer is 0.3 parts, the thickener is 1.5 parts, the curing agent is 20 parts, and the antioxidant is 1 part.

[0019] The performance of the anti-rust and corrosion-resistant water-based industrial paint for steel structures of Example 1 and Example 2 was tested, and the test results are shown in Table 1.

[0020] Table 1 Performance test results of steel structure anti-rust and corrosion resistant water-based industrial paint in Example 1~2

[0021] Note: Refer to HG / T5176-2017 Water-based anti-corrosion coatings for steel structures.

Claims

1. A method for preparing a rust-proof and corrosion-resistant water-based industrial paint for steel structures, characterized in that: The following steps are involved: (1) Preparation of modified waterborne alkyd resin: by weight, add 10-12 parts of epoxidized soybean oil, 40-42 parts of linseed oil, 15-18 parts of trimethylolpropane, and 30-35 parts of epoxidized natural rubber into a reactor, heat to 230-240°C for alcoholysis, and alcoholyze until the epoxy value is 0 and the tolerance of 95% ethanol is 4-5, then add 15-18 parts of isophthalic acid, 0.01-0.02 parts of yellow lead, and 55-60 parts of xylene to continue the reaction. When the acid value is 20-25 mgKOH / g, the temperature is lowered to 130°C, xylene is distilled under reduced pressure, and then 30-35 parts of trimellitic anhydride are added, the temperature is raised to 160°C and kept warm. When the acid value is 40-50 mgKOH / g, the temperature is lowered to 80°C, triethylamine is added to neutralize to a pH value of 7.3-7.8, and water is added to adjust the solid content to 45-50%, thereby obtaining a modified waterborne alkyd resin. (2) The modified waterborne alkyd resin, anti-corrosion filler, and anti-flash rust agent are added while stirring. Add the premixed resin component to the styrene-acrylate emulsion, control the overtime speed at 1000~1500rpm, filter to obtain the premixed resin component, and set aside; (3) Add the leveling agent, thickener, defoamer and antioxidant to the deionized water in turn, stir and mix them thoroughly at a speed of 500~600rpm, let it stand for 2h, and then obtain the premixed auxiliary component, and set aside; (4) Batch mixing: Mix the premixed resin component and the premixed auxiliary component and add them to the water-based curing agent and stir them thoroughly at a speed of 200~ 300rpm, and after filtering, a trailer anti-rust and corrosion-resistant water-based industrial paint with a solid content of 40% to 50% is obtained; in parts by weight, the styrene-acrylate emulsion is 35 to 40 parts, the modified water-based alkyd resin is 55 to 60 parts, the anti-corrosion filler is 10 to 15 parts, the anti-flash rust agent is 0.5 to 1 part, the leveling agent is 0.2 to 0.5 parts, the defoamer is 0.1 to 0.3 parts, the thickener is 0.5 to 1.5 parts, the curing agent is 15 to 20 parts, and the antioxidant is 0.5 to 1 part.

2. The method for preparing the rust-proof and corrosion-resistant water-based industrial paint for steel structures according to claim 1, characterized in that: The epoxidized natural rubber has an epoxidation degree of 40-50% and a ring-opening degree of 4-5%.

3. The method for preparing the rust-proof and corrosion-resistant water-based industrial paint for steel structures according to claim 1, characterized in that: The styrene-acrylate emulsion has a solid content of 48-50%.

4. The method for preparing the rust-proof and corrosion-resistant water-based industrial paint for steel structures according to claim 1, characterized in that: The anti-corrosion filler is zinc oxide modified aluminum tripolyphosphate, and the anti-flash rust agent is sodium nitrite or sodium benzoate.

5. The method for preparing the rust-proof and corrosion-resistant water-based industrial paint for steel structures according to claim 1, characterized in that: The curing agent is sulfur water dispersant.

6. The method for preparing the rust-proof and corrosion-resistant water-based industrial paint for steel structures according to claim 1, characterized in that: The thickener is TT935 or GEL400.

7. The method for preparing the rust-proof and corrosion-resistant water-based industrial paint for steel structures according to claim 1, characterized in that: The leveling agent is UH-420 or Y-2089.

8. The method for preparing the rust-proof and corrosion-resistant water-based industrial paint for steel structures according to claim 1, characterized in that: The antioxidant is antioxidant FT-NOX 3036.

9. The method for preparing the rust-proof and corrosion-resistant water-based industrial paint for steel structures according to claim 1, characterized in that: The defoaming agent is HX-2500 or Foamex 825.

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