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Cation-nonionic mixed aqueous polyurethane emulsion and preparation method thereof

A water-based polyurethane, non-ionic hydrophilic technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of unsatisfactory mechanical properties and processing properties of adhesive films, affecting popularization and application, increasing costs, etc., and achieving excellent chemical resistance. The effect of medicinal properties, favorable for promotion and application, and price reduction

Active Publication Date: 2012-11-14
CNOOC CHANGZHOU PAINT & COATINGS IND RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The waterborne polyurethane prepared by this method has high solid content and low viscosity, good emulsion stability, and good resistance to electrolyte, acid and alkali, but the mechanical properties and processing properties of the obtained film still cannot meet the requirements of metal materials. The requirements for the mechanical properties of water-based resins in the field of pre-treatment, and the price of trimethylolpropane polyethoxy monobutyl ether products as raw materials are relatively high (the current market price is 150-200 yuan / kg), resulting in water-based polyurethane emulsion The cost of the product is greatly increased, which in turn affects its application in the field of pretreatment of galvanized steel sheets

Method used

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  • Cation-nonionic mixed aqueous polyurethane emulsion and preparation method thereof
  • Cation-nonionic mixed aqueous polyurethane emulsion and preparation method thereof
  • Cation-nonionic mixed aqueous polyurethane emulsion and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031]Example 1 Preparation of nonionic hydrophilic chain extender 3-(N,N-dihydroxyethyl) amino-propionic acid polyethylene glycol monomethyl ether ester

[0032] Add 438 grams (equivalent to 1 mole) of methoxypolyethylene glycol monoacrylate (chemical formula CH 2 =CH-COO(CH 2 CH 2 O) n CH 3 , where n=8, the hydroxyl value is 250~260mgKOH / g, the molecular weight is 438) and 200 grams of solvent acetone, heated to 55~60°C and began to add 105.1 grams (equivalent to 1 mole) of diethanolamine dropwise, and the dropwise was completed within 3 hours , and then heated to 80°C for 8 hours, and after reflux for 8 hours, the solvent acetone was distilled off under reduced pressure to obtain the non-ionic hydrophilic chain extender 3-(N,N-dihydroxyethyl)aminopropionic acid polyethylene glycol monomethyl ether Ester, its hydroxyl value is 200~210mgKOH / g, save it for future use.

Embodiment 2

[0033] Embodiment 2 prepares cationic-nonionic mixed type water-based polyurethane emulsion

[0034] The specific operation is as follows:

[0035] ①Preparation of raw materials for the synthesis of cationic-nonionic hybrid water-based polyurethane emulsion

[0036] The amount of each raw material and its percentage in the total weight of raw materials used are as follows:

[0037] The isocyanate is 100 grams of isophorone diisocyanate, accounting for 12.98%,

[0038] Ordinary macromolecular polyols are polyoxypropylene diols, with a number average molecular weight of 2000, a hydroxyl value of 51-61 mgKOH / g, 75 grams, accounting for 9.73%;

[0039] Nonionic hydrophilic chain extender (embodiment 1 system) 25 grams, accounts for 3.24%;

[0040] The ordinary small molecule chain extender is 7.5 grams of ethylene glycol, accounting for 0.97%;

[0041] The crosslinking agent is 5 grams of trimethylolpropane, accounting for 0.65%;

[0042] The cationic hydrophilic chain extend...

Embodiment 3

[0051] The specific operation is as follows:

[0052] ①Preparation of raw materials for the synthesis of cationic-nonionic hybrid water-based polyurethane emulsion

[0053] Basically the same as embodiment 2, the difference is:

[0054] The isocyanate is 78 grams of 2,4-toluene diisocyanate, accounting for 11.04%

[0055] Ordinary macromolecular polyols are polytetrahydrofuran ether polyols, with a number-average molecular weight of 2000, a hydroxyl value of 51-61 mgKOH / g, 75 grams, accounting for 10.61%;

[0056] Nonionic hydrophilic chain extender (embodiment 1 system) 25 grams, accounts for 3.54%;

[0057] Common small molecule chain extender is 6 grams of ethylene glycol, accounting for 0.85%

[0058] The crosslinking agent is 6.8 grams of trimethylolpropane, accounting for 0.96%;

[0059] The cationic hydrophilic chain extender is 15 grams of N-methyldiethanolamine, accounting for 2.12%;

[0060] The catalyst is 0.07 grams of dibutyltin dilaurate, accounting for 0.00...

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Abstract

The invention relates to a cation-nonionic mixed aqueous polyurethane emulsion and a preparation method thereof. The emulsion is aqueous polyurethane which has a cation hydrophilic group and a nonionic hydrophilic side chain. The preparation method comprises the steps of firstly introducing the nonionic hydrophilic side chain by using a specific nonionic hydrophilic chain extender; and introducing the cation hydrophilic group by using a cation hydrophilic chain extender, wherein the amounts of the nonionic hydrophilic chain extender and the cation hydrophilic chain extender respectively account for 1-10 percent and 1-8 percent according to the total weight of the raw materials, and the specific nonionic hydrophilic chain extender is 3-(N,N-dihydroxyethyl) amino-propionic acid polyethyleneglycol monomethyl ether ester which is prepared by heating and reacting methoxy polyethylene glycol single methyl acrylate and diethanol amine in a molar ratio of 1:1. By using the emulsion, the defect of the existing emulsion is overcome, and the requirement of zinc-plating steel plate chromium-free passivation pretreatment on aqueous polyurethane resins are met, so that the cost is reduced.

Description

technical field [0001] The invention relates to a cationic-nonionic mixed water-based polyurethane emulsion and a preparation method thereof. The emulsion is particularly suitable for the field of chromium-free passivation pretreatment of galvanized steel sheets. Background technique [0002] About 1 / 4 of the steel in the world is corroded due to rust every year. In order to avoid the corrosion of steel, one of the more commonly used methods is to passivate the steel plate. At present, chromate passivation treatment is generally used, but this passivation solution contains a large amount of harmful substances such as hexavalent chromium. Therefore, more and more countries have promulgated the prohibition of passivation solutions containing hexavalent chromium. Under such a background, developing a chromium-free passivation treatment solution that does not contain harmful substances such as hexavalent chromium is one of the development directions in the field of metal surface...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/50C08G18/32C08G18/12C09D175/08C09D175/06
Inventor 许飞胡中陈卫东庄振宇
Owner CNOOC CHANGZHOU PAINT & COATINGS IND RES INST
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