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Dendritic organic-inorganic hybrid water-borne nano polyurethane-epoxy anticorrosive coating and preparation method thereof

An epoxy anti-corrosion coating and dendritic technology, applied in polyurea/polyurethane coatings, anti-corrosion coatings, coatings, etc., can solve problems such as poor solvent resistance, VOC pollution, and poor toughness of water-based anti-corrosion coatings, and achieve surface matching. Strong bit, low cost, large specific surface effect

Inactive Publication Date: 2010-08-11
SICHUAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problems existing in the metal anticorrosion coatings of the prior art, the present invention aims to provide a dendritic organic-inorganic hybrid waterborne nano polyurethane-epoxy interpenetrating network anticorrosion coating and a preparation method thereof to solve the problem of traditional solvent-based anticorrosion coatings. VOC pollution is serious, and a series of major key problems such as poor toughness, weather resistance, aging resistance, acid resistance, alkali resistance and solvent resistance of current water-based anti-corrosion coatings

Method used

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  • Dendritic organic-inorganic hybrid water-borne nano polyurethane-epoxy anticorrosive coating and preparation method thereof
  • Dendritic organic-inorganic hybrid water-borne nano polyurethane-epoxy anticorrosive coating and preparation method thereof
  • Dendritic organic-inorganic hybrid water-borne nano polyurethane-epoxy anticorrosive coating and preparation method thereof

Examples

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Effect test

Embodiment 1

[0042] 1. Preparation of dendritic organic-inorganic hybrid nano-polyurethane-epoxy emulsion

[0043] (1) Add DMPA and N-methylpyrrolidone three times its mass into a reaction kettle equipped with stirring, temperature control and air extraction devices, heat up to about 80°C, dissolve and disperse for about 30 minutes, cool down to about 30°C, and massage Birby n NCO / n OH =1.5 Add MDI, slowly raise the temperature to about 70°C and react for about 60 minutes, add PTMG4000 with a diisocyanate molar content of 10% and continue the reaction for about 90 minutes to obtain a linear polyurethane prepolymer containing a hydrophilic group;

[0044] (2) Add 0.5% dipentaerythritol, 3% DMF and 0.3% dibutyltin dilaurate to the prepared polyurethane prepolymer, slowly heat up to about 80°C for chain extension, and react for about 120 minutes to obtain Polyurethane prepolymers containing dendritic structures;

[0045] (3) add its mass content 2% nano TiO in the dendritic structure poly...

Embodiment 2

[0063] 1. Preparation of dendritic organic-inorganic hybrid nano-polyurethane-epoxy emulsion

[0064] (1) Add DMBA and methyl ethyl ketone three times its mass into a reaction kettle equipped with stirring, temperature control and air extraction devices, heat up to about 60°C to dissolve and disperse for about 40 minutes, then cool down to about 35°C, NCO / n OH =2 Add IPDI, slowly heat up to 80°C and react for 60 minutes, add PCDL1000 with a diisocyanate molar content of 8% and continue to react for 60 minutes to obtain a linear polyurethane prepolymer containing a hydrophilic group;

[0065] (2) Add 2% pentaerythritol, 5% DMF and 0.5% dibutyltin dilaurate to the prepared polyurethane prepolymer, slowly rise to 80°C for chain extension, and after 180 minutes of reaction, obtain the Polyurethane prepolymer with shaped structure;

[0066] (3) heat preservation adds (2) described dendritic structure polyurethane mass content 8% nanometer SiO 2 React with 20% epoxy resin E-44 a...

Embodiment 3

[0086] 1. Preparation of dendritic organic-inorganic hybrid nano-polyurethane-epoxy emulsion

[0087] (1) Add N-methyldiethanolamine and acetone 5 times its mass into a reaction kettle equipped with stirring, temperature control and air extraction devices, heat up to 50°C and dissolve and disperse for 50 minutes, then cool down to 30°C, no NCO / n OH =3 Add TDI, slowly heat up to 70°C for 70 minutes, add PCDL500 with a diisocyanate molar content of 25%, and continue the reaction for 40 minutes to obtain a linear polyurethane prepolymer containing a hydrophilic group;

[0088] (2) Add 4.5% trimethylolbutane, 5% N-methylpyrrolidone and 0.5% dibutyltin dilaurate to the prepared polyurethane prepolymer, slowly heat up to 70°C for chain extension , after reacting for 120min, obtain the polyurethane prepolymer containing dendritic structure;

[0089] (3) adding (2) the dendritic structure polyurethane with a mass content of 8% nano-ZnO and 30% epoxy resin E-42, and reacting at 70°...

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Abstract

The invention discloses a dendritic organic-inorganic hybrid water-borne nano polyurethane-epoxy anticorrosive coating and a preparation method thereof. Compositions of the coating mainly comprise dendritic organic-inorganic hybrid water-borne nano polyurethane-epoxy emulsion, anticorrosive pigment and filler, pigment dispersing agent, a film forming aid, a water-based additive, a cross-linking curing agent and deionized water, wherein the dendritic organic-inorganic hybrid water-borne nano polyurethane-epoxy emulsion is prepared by the following steps: prepolymerizing a polyurethane hydrophilic branch; preparing a dendritic polyurethane intermediate product by adopting hyperbranched synthesis technology; inoculating organic-inorganic hybrid into a nano material by adopting a in-situ polymerization; and simultaneously grafting epoxy resin with hydroxyl; and the prepared emulsion is compounded with the anticorrosive pigment and filler and the like to prepare the anticorrosive coating. The anticorrosive coating radically solves the VOC pollution problem of solvent-type anticorrosive coating, and simultaneously solves a series of problems such as poor roughness, weatherability, ageing resistance, alkali resistance and solvent resistance of the conventional water-borne anticorrosive coating.

Description

Technical field: [0001] The invention relates to a polyurethane-epoxy anticorrosion coating, in particular to a dendritic organic-inorganic hybrid waterborne nano polyurethane-epoxy anticorrosion coating for metal anticorrosion and a preparation method thereof. technical background: [0002] Corrosion of metal materials is a serious problem facing the world. Corrosion not only causes huge economic losses and wastes precious metal resources, but also hinders the development of new technologies and new processes, and destroys normal production and living order, resulting in The economic loss and environmental pollution have attracted more and more attention. According to relevant statistics, China's economic losses caused by corrosion in 2008 reached 1.5 trillion yuan, which was equivalent to 5% of the country's GDP in that year. Economic losses account for at least 3% to 5% of the country's GDP, far greater than the sum of losses caused by earthquakes, tsunamis, floods and o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/04C09D5/08
Inventor 辛中印陈政张帆黄美松
Owner SICHUAN UNIV
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