Method for preparing composite emulsion of epoxy resin-polyurethane

A technology of epoxy resin and composite emulsion, which is applied in the field of coating science and functional polymers. It can solve the problems affecting the performance of the composite system, the difficulty of phase inversion emulsification, and the high viscosity of the prepolymer, so as to improve the mechanical strength and solvent resistance. Improve the mechanical properties and increase the effect of cross-linking density

Inactive Publication Date: 2008-09-24
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, epoxy resin has natural incompatibility with polyurethane resin, which will inevitably affect the performance of the composite system
In order to solve this problem, people (Chinese Patent Application No.: 200610096041.0; Chinese Patent Application No.: 200610044553.2) use epoxy resin as a polyhydroxy compound to participate in the synthesis of wa...

Method used

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  • Method for preparing composite emulsion of epoxy resin-polyurethane
  • Method for preparing composite emulsion of epoxy resin-polyurethane

Examples

Experimental program
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Embodiment 1

[0030] A preparation method of epoxy resin-polyurethane composite emulsion, comprising the following steps:

[0031]Under dry nitrogen protection, 3g polyester diol (PBA, Mn=2000, hydroxyl value 53~56mgKOH / g, industrial grade, Yantai Huada Chemical Co., Ltd.), 6g polycarbonate diol ( PCD, Mn=2000, hydroxyl value 56 ± 3mgKOH / g, C.P., Shanghai Hersbit Chemical Co., Ltd.) and 5g isophorone diisocyanate (IPDI, C.P., Hurls Company, Germany) were added to an electric stirrer equipped with reflux In a 250ml four-neck flask with a condenser tube and a thermometer, heat up to 90°C and react at a constant temperature for 60 minutes; add 3g of dimethylolpropionic acid, continue the reaction at 90°C for 60min, add 0.3g of trimethylolpropane, and continue at 90°C After reacting for 60min, the mixture of epoxy resin and diethanolamine (ratio of the amount of substance is 1: 1) was added in another four-necked flask at 60 ℃ for 120min (the addition of epoxy resin and diethanolamine is 0.5g ...

Embodiment 2

[0047] A preparation method of epoxy resin-polyurethane composite emulsion, comprising the following steps:

[0048] 1) Under the protection of nitrogen, mix the polyisocyanate and the oligomer diol in a mass ratio of 5:7, heat up to 70°C, and react at a constant temperature for 60 minutes to obtain a linear urethane prepolymer; the polyisocyanate is toluene diisocyanate , the oligomer diol is polyester polyol;

[0049] 2) Add a small molecule chain extender to the linear urethane prepolymer in step 1), continue to react at 70°C for 30 minutes, then add a macromolecular hydrophilic chain extender, and continue to react at 70°C for 45 minutes to obtain urethane prepolymer polymer; wherein, the mass ratio of polyisocyanate to small molecule chain extender is 5:3.0, the mass ratio of polyisocyanate to macromolecular hydrophilic chain extender is 5:0.6; the small molecule chain extender is dimethylolpropane Acid, macromolecular hydrophilic chain extender is epoxy resin-amine addu...

Embodiment 3

[0053] A preparation method of epoxy resin-polyurethane composite emulsion, comprising the following steps:

[0054] 1) Under the protection of nitrogen, mix polyisocyanate and oligomer diol in a mass ratio of 5:11, heat up to 90°C, and react at a constant temperature for 90 minutes to obtain a linear urethane prepolymer; the polyisocyanate is isophor Ketone diisocyanate; oligomer diols are polycarbonate polyols and polyether polyols, polycarbonate polyols and polyether polyols each account for 1 / 2 of the mass of oligomer diols; all polycarbonate polyols Alcohol, polyether polyol can realize the present invention;

[0055] 2) Add a small molecular chain extender to the linear urethane prepolymer in step 1), continue to react at 90°C for 60 minutes, then add a macromolecular hydrophilic chain extender, and continue to react at 90°C for 60 minutes to obtain urethane prepolymer polymer; wherein, the mass ratio of polyisocyanate to small molecule chain extender is 5:3.7, the mass...

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Abstract

The invention relates to a preparation method of epoxy resin-polyurethane composite latex. In the invention, firstly, polyisocyanate and oligomer diol are adopted to prepare linear amine ester prepolymer; cross-linking modification (small-molecule chain extender and large-molecule hydrophilic chain extender) and composite resin (linear amine ester prepolymer and epoxy resin)blend modification are integrated; the small-molecule chain extender and the large-molecule hydrophilic chain extender are used to extend the chain of the linear amine ester prepolymer, so that the linear amine ester prepolymer has a hydrophilic functional group and a branching structure, and the amine ester prepolymer with molecular internal cross-linking structure; and then liquid epoxy resin is added in, a neutralizer is added in to form salt and ionic water is added in to emulsificate, to prepare the epoxy resin-polyurethane composite latex. The composite latex of the invention has good stability with the grain size of about 140mm, consumes a small amount of curing agent, can improve the film performance and corrosion resistance, and is green and environment protective. The epoxy resin-polyurethane composite latex is applied in pigment concentrates to prepare two-component water-borne anti-corrosive coating.

Description

technical field [0001] The invention belongs to the technical field of functional macromolecules, and also belongs to the technical field of coating science, and specifically relates to a preparation method of epoxy resin-polyurethane composite emulsion. Background technique [0002] Polyurethane resin (PUR) is widely used as a film-forming substance for organic coatings, and water-based polyurethane (WPU) with water as a dispersion medium has become the direction of research and development of PUR in recent years. The WPU with a linear structure forms a film in the form of polymer chain entanglement or physical crosslinking, and the performance of the coating film needs to be improved. At present, people use blending method (Prog.Org.Coat., 1998, 33:108~116), grafting method (Polym.Int., 2005, 54, 488~492), "core-shell" particle design (Prog. .Org.Coat., 2000, (38): 27~34), miniemulsion polymerization technology (Adv.Polym.Sci., 2005, 175: 129~255), IPN technology (Macromo...

Claims

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Application Information

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IPC IPC(8): C08L63/00C08L75/04C08G18/65C08G18/58C08G18/10C09D163/00C09D175/04
Inventor 易英黄畴叶发银郑化
Owner WUHAN UNIV OF TECH
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