Preparation method of environment-friendly metal antiseptic silane modified waterborne polyurethane resin and antiseptic treatment method

A water-based polyurethane and silane modification technology, applied in metal material coating process, coating and other directions, can solve the problems of poor water resistance, reduced interface adhesion, and poor water stability of a single silanized film, and achieves low cost, Improved anti-corrosion performance and thin coating

Inactive Publication Date: 2015-11-04
广东德丽雅新材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004]It is worth noting that although the silanization treatment of the metal surface makes the silane and the metal surface firmly bond together, the water stability of the bond itself is not good. When a large amount of water invades, the covalent bonds will be hydrolyzed to re-form Si-OH and Me-OH groups. Obviously, when a large number of Si-O-Me covalent bonds on the interface are hydrolyzed, the adhesion of the interface will be greatly improved. Therefore, the water resistance of the silanized film is the key to prevent the hydrolysis of Si-O-Me covalent bonds and maintain the good adhesion strength of the interface
At present, the main method to solve this problem is to coat a layer of resin on the silanized film to solve the problem of poor water resistance of a single silanized film. reported on this
[0005] Silane coupling agent modified water-based polyurethane has been studied, Hou Menghua reported "Aminosilane coupling agent modified water-based polyurethane wood coatings" on silane coupling agent The application of joint agent modified water-based polyurethane in wood lacquer has been studied; "Research on 3-Aminopropyltriethoxysilane Modified Water-based Polyurethane" reported by Bao Liang analyzed the hardness and water resistance of this modified polyurethane film. Carry out research; Chinese patent " a kind of preparation method of silane-modified water-based polyurethane " application number CN103435772A discloses a kind of water-based polyurethane used for leather surface finishing, can endow leather with good mechanical properties and water resistance, silane coupling agent The application of modified waterborne polyurethane resin in metal anticorrosion has not been reported yet

Method used

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  • Preparation method of environment-friendly metal antiseptic silane modified waterborne polyurethane resin and antiseptic treatment method
  • Preparation method of environment-friendly metal antiseptic silane modified waterborne polyurethane resin and antiseptic treatment method
  • Preparation method of environment-friendly metal antiseptic silane modified waterborne polyurethane resin and antiseptic treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1. Take 8g of dimethylolpropionic acid and dissolve it in 20g of N-methylpyrrolidone, then mix it with 110g of polytetramethylene ether glycol, add 55g of isophorone diisocyanate while stirring at room temperature, catalyst butyltin dilaurate 0.2 g, then slowly raise the temperature to 80°C for 2h, then add 2.5g of trimethylolpropane, react at 80°C for 3h, then cool down to 60°C, add 5.5g of triethylamine to neutralize for 20min;

[0031] 2. Use ice water to cool down to about 25°C, stir with a gear disperser at 2500r / min at high speed, first add 160g of water to disperse, then add 15g of γ-aminopropyltriethoxysilane, disperse at high speed for 30min, and let it stand for defoaming. Prepare the anticorrosion resin for subsequent use;

[0032] 3. Purify the metal pattern: degrease and polish the metal, then rinse with water, then use hydrochloric acid solution to remove rust, then rinse with water, and finally rinse with deionized water and dry;

[0033] 4. Dilu...

Embodiment 2

[0039] Dilute the anti-corrosion resin synthesized in Example 1 with water to a solid content of 10%, immerse the purified metal iron plate sample in the diluted water-based resin for 5 minutes, take out the metal sample, and dry it at room temperature for 24-28 hours.

[0040] Performance Testing:

[0041] The performance of this product is compared with that of silane (γ-aminopropyltriethoxysilane) hydrolyzate and German Bayer Bayhydrol UH XP 2592 product in different solid contents, see Table 1, and the Tafel curve test is shown in Table 1. figure 1 .

[0042]Table 2 5%CuSO4 pitting test data

[0043] project This embodiment 2 product Bayhydrol UH XP 2592 γ-Aminopropyltriethoxysilane 0% 4～5s 4～5s 4～5s 10% 175~180min 29~30min 9~10min

Embodiment 3

[0045] 1. Preparation of water-based polyurethane prepolymer: Mix polytetramethylene ether glycol PTMEG, isophorone diisocyanate, dimethylol propionic acid and solvent at room temperature, then slowly heat up to 80°C, react for 2 hours, and then Add trimethylolpropane, continue to react at 80°C for 3h, cool down to 60°C after the reaction is completed, add triethylamine and solvent, and neutralize for 20min to obtain a water-based polyurethane prepolymer;

[0046] 2. Preparation of silane-modified waterborne polyurethane: Cool the waterborne polyurethane prepolymer prepared above to 22°C with ice water, stir vigorously at 1500r / min, add water to disperse at high speed, and add γ-aminopropyltriethoxy Silane, capping the prepolymer, dispersing at a high speed for 30 minutes, standing for defoaming, and preparing an environmentally friendly metal anti-corrosion silane-modified waterborne polyurethane resin.

[0047] The total amount of prepolymer is the mass sum of polyol...

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Abstract

The invention relates to a preparation method of environment-friendly metal antiseptic silane modified waterborne polyurethane resin and an antiseptic treatment method, and belongs to the technical field of metal surface antiseptic treatment. The preparation method comprises the steps that polyhydric alcohols, polyisocyanates and a hydrophilic chain-extending agent react for 2 h and then added with a cross-linking agent, a reaction continues to be carried out for 3 h at 80 DEG C, the mixture is added with triethylamine for neutralizing after being cooled to 60 DEG C, and a waterborne polyurethane prepolymer is obtained; then the waterborne polyurethane prepolymer is cooled by ice water to room temperature and added with water under strong stirring for high-speed dispersion, a silane coupling agent is added to terminate the prepolymer, high-speed dispersion is carried out for 30 min, standing and defoaming are carried out, and therefore the metal antiseptic silane modified waterborne polyurethane resin is obtained. The invention further discloses the antiseptic treatment method for metal. The antiseptic treatment method comprises the steps that the obtained antiseptic resin is placed in a container, evenly attached to the surface of the purified metal and then driven at room temperature. By using the antiseptic resin for treating the surface of metal, the antiseptic performance is remarkably improved, the technology is simple, a coating film is thin, and the cost is low.

Description

technical field [0001] The invention relates to a preparation and anticorrosion treatment method of an anticorrosion resin, in particular to a preparation method and an anticorrosion treatment method of an environment-friendly metal anticorrosion silane-modified waterborne polyurethane resin, belonging to the technical field of metal surface anticorrosion treatment. Background technique [0002] In the pretreatment process of metal painting, phosphating treatment is one of the most commonly used pretreatment methods. Phosphating treatment is a process in which a metal reacts in an acidic phosphate solution to form a phosphate protective film on its surface. The phosphating film produced by phosphating treatment is firmly bonded to the substrate, has a microporous structure, and has good adsorption performance, so it can be Greatly improve the coating quality. However, phosphating treatment also has many disadvantages that cannot be overcome by itself. For example, the phosp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/12C08G18/10C08G18/08C23C22/02
CPCC08G18/12C08G18/0823C08G18/10C08G18/4854C08G18/6692C08G2150/90C23C22/02C23C2222/20C08G18/289C08G18/3206
Inventor 梁亮胡龙江建东
Owner 广东德丽雅新材料有限公司
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