Application to coating of ultra-corrosion-resistant cold and hot water-resistant circulating pipeline inner wall protective paint

Abstract

The invention relates to ultra-corrosion-resistant cold and hot water-resistant circulating pipeline inner wall protective paint. The coating is prepared from the following raw materials: epoxy modified phenolic resin, polyether modified polydimethylsiloxane, a dispersing agent, a flatting agent and the like. According to the invention, phenolic epoxy modified resin is used as matrix resin, so that the paint has good corrosion resistance, heat resistance and adhesive force; the polyether modified polydimethylsiloxane is added, so that the surface tension of a coating film is greatly reduced, the passing resistance of water in a pipe is reduced, and the adhesive force of a paint film is improved; the graphene is added, so that the corrosion resistance of the coating film is greatly improved. By changing the surface tension of a paint film and improving the adhesive force of the paint film and a substrate, the salt fog resistance of the paint film reaches 1500 hours; by using the epoxy modified phenolic resin, graphene and other raw materials, the acid and alkali resistance reaches 1500 hours, the standard EN877 of the European Union for cast iron pipes and fittings for building drainage as well as joints and accessories thereof is met, and the blank that no pipe inner wall coating meeting the EN877 standard exists in China is filled.

Description

Technical Field

[0001] The present invention belongs to the technical field of pipeline inner wall anticorrosive coating and production process, and relates to pipeline inner wall coating composed of epoxy modified phenolic resin, polyether modified polydimethylsiloxane, dispersant, leveling agent, pigment, polyamide anti-settling wax, zinc phosphate, talcum powder and nano-graphene, and a preparation method thereof. Background Art

[0002] With the increase of my country's import and export trade and the improvement of requirements for cast pipes for construction, the pipe fittings exported by my country to the EU must meet the EU standard EN877 for cast iron pipes and fittings for building drainage and their joints and accessories. The test of cold and hot water cycle resistance in the EN877 standard is extremely harsh. The test steps are (30±1)L, (93±2)℃ water flows through the pipeline system for 1 minute, empties and stays for 1 minute. (30±1)L, (15±5)℃ water flows through the pipeline system for 1 minute, empties and stays for 1 minute. The paint film has no discoloration, whitening, bubbling, rust, etc. after 1500 cycles. Before the advent of the present invention, there was no coating that could pass this test in China. The present invention also fills the gap in my country's cast pipe inner wall paint that can meet the EN877 standard.

[0003] At present, most of the inner wall coatings of pipelines in my country are solvent-based coatings. With the gradual and strict control of environmental protection in my country, water-based pipeline coatings are also imperative. The construction process requirements of water-based pipeline coatings are very strict. The preheating of pipe fittings before spraying, flash drying after spraying, and baking temperature must have good coating process conditions. The medical waste water pipeline inner wall protective paint of the present invention is actually an invention that meets the strict and demanding performance indicators of medical waste water pipelines and meets the requirements of environmental protection regulations.

[0004] The present invention uses epoxy-modified phenolic resin to make the coating have better anti-corrosion performance, heat resistance and adhesion. Polyether-modified polydimethylsiloxane greatly reduces the surface tension of the coating, reduces the resistance of water passing through the pipe, and improves the adhesion of the paint film. Adding graphene can greatly improve the anti-corrosion performance of the coating surface. Summary of the invention

[0005] The purpose of the present invention is to solve the domestic blank of the EU standard EN877 for cast iron pipes and fittings for building drainage and their joints and accessories. At present, the present invention has been mass-produced in our company and is widely used in the leading domestic cast pipe enterprises.

[0006] To achieve the above purpose, the present invention discloses the following technical contents: A super anti-corrosion and cold and hot water circulation pipeline inner wall protective paint, weight parts of raw materials composition: Main raw material ratio (1) Paint paste: Epoxy modified phenolic resin F44 / 70% 40 Dispersant F361 0.5 Polyether modified polydimethylsiloxane BYK333 0.3 Bentonite HY-2 2 Iron Red 6597 7 Iron yellow G313 5 Zinc phosphate 10 Talc 3000 mesh 16 Graphene 5 Xylene 7 n-Butanol 3 (2) Dilution treatment of epoxy modified phenolic resin Epoxy modified phenolic resin F44 70 Xylene 21 n-Butanol 9 (3) Dilution of dispersant Dispersant F361 50 Xylene 50 (4) Dilution treatment of polyether-modified polydimethylsiloxane Polyether modified polydimethylsiloxane BYK333 50 Xylene 50 (5) Harmony Paint slurry 80-90 Epoxy resin 128 / 100% 2-3 Leveling agent BYK-320 0.3-0.5 Polyamide anti-settling wax 5500 1-2 Xylene 5-7 Butanol 1-3 (6) Dilution of leveling agent Leveling agent BYK-320 50 Xylene 50 (7) Preparation of hardener (main agent: hardener = 6:1) Xylene 42 n-Butanol 18 T-33 40 Description of the above ingredients: The epoxy modified phenolic resin is F44 from Shandong Deyuan Chemical, the dispersant F361 and polyamide anti-settling wax 5500 are produced by HS Chemical of South Korea, the polyether modified polydimethylsiloxane BYK-333 and the leveling agent BYK-320 are produced by BYK Chemical, the iron red 6597 and the iron yellow G313 are produced by Lingshou County Jieling Minerals, the zinc phosphate is produced by Shijiazhuang Xinsheng Chemical, the nano-graphene is produced by Shandong Jinqianrun New Materials, and the hardener T-33 is produced by Suzhou Hengst.

[0007] The present invention further discloses a method for preparing a super corrosion-resistant cold and hot water circulation pipeline inner wall protective paint, which is characterized by the following steps: (1) Preparation of paint paste Add epoxy modified phenolic resin F44 / 70% in a stainless steel basin, stir at a low speed of 300-500 rpm, then add dispersant F361, then add polyether modified polydimethylsiloxane BYK333 and stir for 10 minutes, add bentonite HY-2 and stir at a high speed of 1200-1500 rpm for 10 minutes, add iron red 6597, iron yellow G313, zinc phosphate, talcum powder 3000 mesh in sequence and stir for 20 minutes, finally add nano-graphene and the remaining diluent in the formula and stir for 20 minutes, use a horizontal sand mill to grind and disperse until the color paste fineness is ≤30μm, grind again, filter out for use; (2) Dilution treatment of epoxy modified phenolic resin Add F44 epoxy modified phenolic resin into a stainless steel basin, stir at a low speed of 300-500 rpm, then add xylene and n-butanol and stir for 30 minutes before use; (3) Dilution of dispersant Add F361 dispersant to a stainless steel basin, stir at a low speed of 300-500 rpm, then add xylene and stir for 15 minutes before use; (4) Dilution treatment of polyether-modified polydimethylsiloxane Add polyether modified polydimethylsiloxane BYK333 into a stainless steel basin, stir at a low speed of 300-500 rpm, then add xylene and stir for 15 minutes before use; (5) Dilution of leveling agent Add leveling agent BYK-320 into a stainless steel basin, stir at a low speed of 300-500 rpm, then add xylene and stir for 15 minutes before use; (6) Blending: Add various raw materials in order Add the ground paint slurry into the paint mixing tank in turn and stir at a low speed of 300-500 rpm, add epoxy resin 128 / 100% and stir for 10 minutes, then add leveling agent BYK-320 and stir for 10 minutes, then adjust the stirring speed to 800-1000 rpm, add polyamide anti-dust wax 5500 and the remaining diluent and stir for 30 minutes, then test the paint slurry data, and use the filter machine for packaging after all performance is qualified.

[0008] (7) Preparation of hardener Add T-33 to a stainless steel basin and stir at a low speed of 300-500 rpm. Then add xylene and n-butanol and stir at 800-1000 rpm for 30 minutes.

[0009] The present invention further discloses the application of super anti-corrosion and cold and hot water circulation pipeline inner wall protective paint in coating; the reference refers to improving the adhesion of the paint film, improving the anti-corrosion performance of the coating surface, the ability of the paint surface to resist cold and hot water circulation, and improving the salt spray resistance of the protective paint, especially the acid and alkali resistance. Experimental results show that the protective paint of the present invention has a salt spray resistance of more than 1500 hours and an acid and alkali resistance of more than 1500 hours. The protective paint is flat and smooth, has no paint film defects, and has strong paint film adhesion. Compared with the existing technology, the anti-corrosion performance of the coating surface has been greatly improved.

[0010] The present invention uses epoxy modified phenolic resin F44 as the main resin, which has good anti-corrosion performance, adhesion and heat resistance for the inner wall of the pipeline; by adding dispersant F361, the viscosity of the paint slurry can be effectively reduced and the dispersibility of the product can be improved; by adding bentonite HY-2, the anti-settling effect and anti-sagging property of the paint slurry can be effectively improved; polyether modified polydimethylsiloxane BYK333 can change the surface tension of the paint film to reduce the resistance of water flowing through the pipeline; by adding a small amount of nano-graphene, the anti-corrosion performance of the coating surface can be further improved; by adding talcum powder 3000 mesh, the water resistance of the paint film can be improved.

[0011] The super anti-corrosion and cold and hot water circulation pipeline inner wall protective paint prepared with the above raw materials has greatly improved the salt spray resistance, acid and alkali resistance, wastewater resistance, and cold and hot water circulation resistance of the paint film by improving the adhesion between the paint film and the substrate and changing the surface tension of the paint film and the heat resistance and medium resistance of the epoxy-modified phenolic resin compared with the current domestic pipeline inner wall coatings. It fills the gap in the domestic standard EN877 that meets the EU standard for cast iron pipes and fittings for building drainage and their joints and accessories. It also further improves the quality and requirements of cast pipes in the domestic construction industry. DETAILED DESCRIPTION

[0012] The present invention is described below by specific embodiments. Unless otherwise specified, the technical means used in the present invention are methods known to those skilled in the art. In addition, the embodiments should be understood as illustrative rather than limiting the scope of the present invention, and the essence and scope of the present invention are limited only by the claims. For those skilled in the art, various changes or modifications to the material composition and dosage in these embodiments, without departing from the essence and scope of the present invention, also belong to the protection scope of the present invention.

[0013] The raw materials and reagents used in the present invention are all commercially available, wherein the epoxy-modified phenolic resin is F44 from Shandong Deyuan Chemical, the dispersant F361 and the polyamide anti-settling wax 5500 are produced by HS Chemical of South Korea, the polyether-modified polydimethylsiloxane BYK-333 and the leveling agent BYK-320 are produced by BYK Chemical, the iron red 6597 and the iron yellow G313 are produced by Lingshou County Jieling Minerals, the zinc phosphate is produced by Shijiazhuang Xinsheng Chemical, the nano-graphene is produced by Shandong Jinqianrun New Materials, and the hardener T-33 is produced by Suzhou Hengst. Example

[0014] Raw material ratio (1) Paint paste: Epoxy modified phenolic resin F44 / 70% 40 Dispersant F361 0.5 Polyether modified polydimethylsiloxane BYK333 0.3 Bentonite HY-2 2 Iron Red 6597 7 Iron yellow G313 5 Zinc phosphate 10 Talc 3000 mesh 16 Graphene 5 Xylene 7 n-Butanol 3 (2) Dilution treatment of epoxy modified phenolic resin Epoxy modified phenolic resin F44 70 Xylene 21 n-Butanol 9 (3) Dilution of dispersant Dispersant F361 50 Xylene 50 (4) Dilution treatment of polyether-modified polydimethylsiloxane Polyether modified polydimethylsiloxane BYK333 50 Xylene 50 (5) Harmony Paint paste 85 Epoxy resin 128 / 100% 2.5 Leveling agent BYK-320 0.4 Polyamide anti-settling wax 5500 1.5 Xylene 6 n-Butanol 2 (6) Dilution of leveling agent Leveling agent BYK-320 50 Xylene 50 (7) Preparation of hardener (main agent: hardener = 6:1) Xylene 42 n-Butanol 18 T-33 40

[0015]

[0016]

[0017] Conclusion: The present invention is a super corrosion-resistant cold and hot water circulation pipeline protective paint. This product has salt spray resistance of more than 1500 hours, acid and alkali resistance of more than 1500 hours, and can pass the EU standard EN877 for cast iron pipes and fittings for building drainage and their joints and accessories. It fills the gap in the domestic EN877 standard, and has been officially produced in our company and has been used in batches in leading domestic cast pipe companies.

Claims

1. A super corrosion-resistant and cold and hot water circulation pipeline inner wall protective paint, raw material composition by weight: Main raw material ratio (1) Paint paste: Epoxy modified phenolic resin F44 / 70% 40 Dispersant F361 0.5 Polyether modified polydimethylsiloxane BYK333 0.3 Bentonite HY-2 2 Iron Red 6597 7 Iron yellow G313 5 Zinc phosphate 10 Talc 3000 mesh 16 Graphene 5 Xylene 7 n-Butanol 3 (2) Dilution treatment of epoxy modified phenolic resin Epoxy modified phenolic resin F44 70 Xylene 21 n-Butanol 9 (3) Dilution of dispersant Dispersant F361 50 Xylene 50 (4) Dilution treatment of polyether-modified polydimethylsiloxane Polyether modified polydimethylsiloxane BYK333 50 Xylene 50 (5) Harmony Paint slurry 80-90 Epoxy resin 128 / 100% 2-3 Leveling agent BYK-320 0.3-0.5 Polyamide anti-settling wax 5500 1-2 Xylene 5-7 Butanol 1-3 (6) Dilution of leveling agent Leveling agent BYK-320 50 Xylene 50 (7) Hardener (main agent:hardener = 6:1) Xylene 42 n-Butanol 18 T-33 40。 2. The method for preparing the ultra-corrosion-resistant cold and hot water circulation pipeline inner wall protective paint according to claim 1, characterized in that Proceed as follows: (1) Preparation of paint paste Add epoxy modified phenolic resin F44 / 70% in a stainless steel basin, stir at a low speed of 300-500 rpm, then add dispersant F361, then add polyether modified polydimethylsiloxane BYK333 and stir for 10 minutes, add bentonite HY-2 and stir at a high speed of 1200-1500 rpm for 10 minutes, add iron red 6597, iron yellow G313, zinc phosphate, talcum powder 3000 mesh in sequence and stir for 20 minutes, finally add nano-graphene and the remaining diluent in the formula and stir for 20 minutes, use a horizontal sand mill to grind and disperse until the color paste fineness is ≤30μm, grind again, filter out for use; (2) Dilution treatment of epoxy modified phenolic resin Add F44 epoxy modified phenolic resin into a stainless steel basin, stir at a low speed of 300-500 rpm, then add xylene and n-butanol and stir for 30 minutes before use; (3) Dilution of dispersant Add F361 dispersant to a stainless steel basin, stir at a low speed of 300-500 rpm, then add xylene and stir for 15 minutes before use; (4) Dilution treatment of polyether-modified polydimethylsiloxane Add polyether modified polydimethylsiloxane BYK333 into a stainless steel basin, stir at a low speed of 300-500 rpm, then add xylene and stir for 15 minutes before use; (5) Dilution of leveling agent Add leveling agent BYK-320 into a stainless steel basin, stir at a low speed of 300-500 rpm, then add xylene and stir for 15 minutes before use; (6) Blending: Add various raw materials in order Add the ground paint slurry to the paint mixing tank in turn and stir at a low speed of 300-500 rpm, add epoxy resin 128 / 100% and stir for 10 minutes, then add leveling agent BYK-320 and stir for 10 minutes, then adjust the stirring speed to 800-1000 rpm, add polyamide anti-dust wax 5500 and the remaining diluent and stir for 30 minutes, then test the paint slurry data, and use the filter machine to package after all performances are qualified; (7) Preparation of hardener Add T-33 to a stainless steel basin and stir at a low speed of 300-500 rpm. Then add xylene and n-butanol and stir at 800-1000 rpm for 30 minutes.

3. The application of the ultra-corrosion-resistant cold and hot water circulation pipe inner wall protective paint as described in claim 1 in coating; the reference refers to improving the adhesion of the paint film and enhancing the anti-corrosion performance of the coating surface.

4. Application of the ultra-corrosion-resistant and cold and hot water circulation pipe inner wall protective paint as described in claim 1 in coating; the reference refers to: improving the salt spray resistance and acid and alkali resistance of the protective paint.

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