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Preparation method of acrylic acid modified waterborne polyurethane dispersion liquid used for metallic paint

A technology of water-based polyurethane and metal coatings, applied in the direction of coating, etc., can solve problems such as delamination, poor copolymerization of acrylic acid and water-based polyurethane dispersion, and poor hardness of the salt-spray resistant coating film of the copolymerization product, etc., to achieve Excellent acid resistance, stable performance, good hardness and mechanical strength

Active Publication Date: 2014-06-11
上海福岛新材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The currently reported acrylic acid-modified water-based polyurethane emulsions are mainly modified by copolymerization. Specifically, water-based polyurethane emulsions are first prepared by stepwise polymerization, and then the free radical polymerization of acrylic acid occurs by using initiators to trigger free radicals. However, both acrylic acid and The water-based polyurethane dispersion cannot be well copolymerized, and the copolymerization product cannot be emulsified completely, and eventually delamination occurs; or although it can be emulsified well, the copolymerization product has problems such as poor salt spray resistance and coating hardness

Method used

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  • Preparation method of acrylic acid modified waterborne polyurethane dispersion liquid used for metallic paint

Examples

Experimental program
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Embodiment 1

[0023] Example 1: 0.4 mol of isophorone diisocyanate was added dropwise to a mixed solution of 0.05 mol of polyglycerol and 0.05 mol of polycaprolactone diol, 0.3 g of stannous octoate was added as a catalyst, and reacted at 85° C. for 2 h to obtain White viscous polyurethane prepolymer. Add 0.1mol ethylene glycol, 0.02mol trimethylolpropane and 0.08mol dimethylolpropionic acid to the prepolymer, and after chain extension reaction at 85°C for 0.5h, add 0.18mol hydroxyethyl acrylate to react for 0.5h , add 0.08mol triethylamine to neutralize, add 350ml deionized water to prepare aqueous polyurethane dispersion. Prepare a mixture of 0.4mol methyl methacrylate, 0.3mol n-butyl acrylate, 0.1mol acrylic acid, and 2.0g oleic acid diethanolamide, prepare 1g of ammonium persulfate in water, and pour it into the aqueous polyurethane dispersion at 90°C The mixed solution and ammonium persulfate aqueous solution were added dropwise, and after the dropwise addition, the temperature was ra...

Embodiment 2

[0024] Example 2: 0.4 mol of isophorone diisocyanate was added dropwise to a mixed solution of 0.05 mol polytetrahydrofuran diol and 0.05 mol polycarbonate diol, 0.3 g of stannous octoate was added as a catalyst, and reacted at 80° C. for 3 h to obtain White viscous polyurethane prepolymer. Add 0.15mol 1,6-hexanediol and 0.08mol dimethylol butyric acid to the prepolymer, after chain extension reaction at 80°C for 1h, add 0.14mol hydroxyethyl acrylate to react for 0.5h, add 0.08mol triethylamine And, add 400ml of deionized water to prepare an aqueous polyurethane dispersion. Prepare a mixed solution of 0.6mol methyl methacrylate, 0.4mol n-butyl acrylate, 0.1mol acrylic acid, and 2.0g polyether phosphate salt, prepare an aqueous solution of 1.2g ammonium persulfate, and pour it into the aqueous polyurethane dispersion at 80°C At the same time, the mixed solution and the ammonium persulfate aqueous solution were added dropwise, and after the dropwise addition was completed, the ...

Embodiment 3

[0025] Example 3: 0.4 mol of isophorone diisocyanate was added dropwise to a mixture of 0.08 mol of polyglycerol and 0.03 mol of polycarbonate diol, 0.3 g of stannous octoate was added as a catalyst, and reacted at 95° C. for 1 h to obtain a white Viscous polyurethane prepolymer. Add 0.1mol ethylene glycol, 0.02mol trimethylolpropane and 0.09mol dimethylolpropionic acid to the prepolymer, after chain extension reaction at 82°C for 0.6h, add 0.14mol hydroxyethyl acrylate to react for 0.5h, Add 0.1 mol of triethylamine for neutralization, and add 450 ml of deionized water to prepare an aqueous polyurethane dispersion. Prepare a mixed solution of 0.5mol methyl methacrylate, 0.8mol n-butyl acrylate, 0.2mol acrylic acid, and 4.0g polyether phosphate salt, prepare an aqueous solution of 1.2g ammonium persulfate, and pour it into the aqueous polyurethane dispersion at 90°C At the same time, the mixed solution and the ammonium persulfate aqueous solution were added dropwise, and afte...

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Abstract

The invention discloses a preparation method of an acrylic acid modified waterborne polyurethane dispersion liquid used for metallic paint. The preparation method of the acrylic acid modified waterborne polyurethane dispersion liquid used for the metallic paint comprises the following steps: uniformly mixing isophorone diisocyanate, polyether polylol and polyester polylol, performing reaction under the catalytic action of stannous octoate for 1-3 hours at the temperature of 80-95 DEG C, so as to obtain a prepolymer; adding a micromolecule chain extender and a hydrophilic monomer into the prepolymer, performing chain extension for 0.5-1 hour at the temperature of 80-85 DEG C, sealing residual end -NCO by utilizing hydroxyethyl acrylate, then adding a neutralizing agent for neutralization and salification, and adding water for emulsification, so that water-based dispersion liquid is obtained; adding an initiator, an emulsifier and other acrylic acid monomers into the water-based dispersion liquid, and performing free radical polymerization for 3-5 hours at the temperature of 85-100 DEG C, so that acrylic acid modified waterborne polyurethane dispersion liquid is obtained. According to the preparation method of the acrylic acid modified waterborne polyurethane dispersion liquid used for the metallic paint, ammonium persulphate is used as the initiating agent, polyether phosphate ester and alkylolamide surfactant are used as the emulsifier, completely successfully emulsified acrylic acid modified waterborne polyurethane dispersion liquid can be prepared, and the obtained acrylic acid modified waterborne polyurethane dispersion liquid has excellent acid resistance, alkali resistance and salt fog resistance and excellent hardness and mechanical property.

Description

Technical field: [0001] The invention belongs to the technical field of resin synthesis, and relates to a method for preparing an acrylic-modified aqueous polyurethane dispersion liquid for metal coatings, which is used for preparing novel resins with excellent hardness and salt spray resistance. Background technique: [0002] Polyurethane (PU for short) refers to a class of polymer materials containing repeated urethane group bonds (NHCOO), and is the abbreviation of polyurethane. Due to its variety of synthetic monomers, mild, specific and controllable reaction conditions, large room for adjustment of formula and microstructure of polymer materials (with microscopic phase separation), it can be widely used in coatings, adhesives, foam plastics , synthetic fibers and elastomers have become one of the indispensable synthetic materials for people's clothing, food, housing, transportation and high-tech fields. [0003] In recent years, with the enhancement of human environmen...

Claims

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Application Information

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IPC IPC(8): C08F283/00C08F220/14C08F220/18C08F220/06C08F2/30C08F2/26C08G18/67C08G18/12C09D151/08
Inventor 宋铁成陈波陈凉一宋传军
Owner 上海福岛新材料科技有限公司
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