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Self-phosphating waterborne polyurethane acrylate resin for axle and preparation method thereof

A technology of polyurethane acrylate and water-based polyurethane, applied in the field of polymer material preparation, can solve the problems of low degree of grafting and cross-linking of acrylate-polyurethane, insufficient degree of film-forming cross-linking, poor stability of emulsion, etc. Corrosion performance, improved emulsion and film performance, good flexibility and wear resistance

Active Publication Date: 2014-04-09
岳阳海玖科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when acrylate is used to modify polyurethane, the grafting rate is low, resulting in poor emulsion stability, insufficient crosslinking degree of film formation, poor film compactness, poor salt spray resistance, and flash rust and flash corrosion in water-based coatings. question
[0004] Patent CN102898592 uses hydroxyethyl methacrylate to block the polyurethane prepolymer, and then uses butyl acrylate to modify the water-based polyurethane to obtain a copolymerized modified water-based polyurethane emulsion. The degree of graft crosslinking of the acrylate polyurethane prepared by this method is Low, the stability of the emulsion is poor
Patent CN103059230 uses diisocyanate, polybutene-acrylonitrile copolymerized glycol and polyether polyol, and hydrophilic chain extender to prepare water-based polyurethane dispersion, and then uses styrene and acrylic acid to modify water-based polyurethane to obtain a solvent-free Type water-based acrylate polyurethane, the emulsion prepared by this method has high viscosity and poor stability

Method used

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  • Self-phosphating waterborne polyurethane acrylate resin for axle and preparation method thereof
  • Self-phosphating waterborne polyurethane acrylate resin for axle and preparation method thereof
  • Self-phosphating waterborne polyurethane acrylate resin for axle and preparation method thereof

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preparation example Construction

[0034] The preparation method of self-phosphating water-based polyurethane acrylate coating for vehicle axle, the steps are as follows:

[0035] 1) Carry out chain extension reaction with polyether diol, diisocyanate, dimethylol propionic acid (DMPA), 1,4-butene diol to obtain a water-based polyurethane prepolymer with terminal isocyanate groups; wherein,— The molar ratio of NCO to —OH is 1.3-1.8; the amount of dimethylolpropionic acid accounts for 4-7wt% of the water-based polyurethane prepolymer; the amount of the 1,4-butene glycol accounts for 1% of the water-based polyurethane prepolymer -4wt%; chain extension reaction temperature is 70-80°C, reaction time is 3-5h, and the viscosity of the system is adjusted with acetone;

[0036] 2) Add hydroxyethyl acrylate (HEA) to the isocyanate group-terminated polyurethane prepolymer to carry out the end-capping reaction, add triethylamine to neutralize the salt after cooling, add water to emulsify, and evaporate the solvent to obtai...

Embodiment 1

[0043]In the above synthesis chain extension process, the diisocyanate is selected from TDI; the molar ratio of —NCO to —OH is 1.3; the amount of dimethylol propionic acid accounts for 4wt% of the waterborne polyurethane prepolymer; the amount of 1,4-butene diol accounts for Prepolymer 1wt%; chain extension reaction temperature is 70°C, reaction time is 3h, during which acetone is used to adjust the viscosity of the system.

[0044] During the capping process, the dosage of hydroxyethyl acrylate was 5wt% of the water-based polyurethane prepolymer, the capping temperature was 70°C, and the capping reaction time was 1 h.

[0045] During the polymerization process, the polymerization reaction temperature was 78°C, the reaction time was 5h, and the amount of the mixed solution of initiator, PM-100 and MMA was 20wt% of the waterborne polyurethane prepolymer; among them, the amount of PM-100 was the waterborne polyurethane prepolymer of 5wt%.

[0046] The finally obtained aqueous s...

Embodiment 2

[0048] In the above-mentioned synthetic chain extension process, the diisocyanate is selected from TDI; the molar ratio of —NCO to —OH is 1.8; the amount of dimethylol propionic acid accounts for 7wt% of the water-based polyurethane prepolymer; the 1,4-butene The amount of diol accounted for 4wt% of the waterborne polyurethane prepolymer; the chain extension reaction temperature was 80°C, and the reaction time was 5h, during which acetone was used to adjust the viscosity of the system.

[0049] During the capping process, the dosage of hydroxyethyl acrylate was 10wt% of the waterborne polyurethane prepolymer, the capping temperature was 70°C, and the capping reaction time was 1 h.

[0050] During the polymerization process, the polymerization reaction temperature was 90°C, the reaction time was 5h, and the amount of the mixed solution of initiator, PM-100 and ethyl acrylate was 30wt% of the waterborne polyurethane prepolymer; among them, the amount of PM-100 was the waterborne ...

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Abstract

The invention discloses self-phosphating waterborne polyurethane acrylate paint applied to a car axle coating production line and a preparation method thereof. The preparation method comprises the following steps: carrying out chain extension reaction on polyether glycol, diisocyanate, dimethylolpropionic acid and 1,4-butylene glycol to obtain an isocyanate-terminated waterborne polyurethane prepolymer; adding hydroxyethyl acrylate to carry out end-capping reaction, adding triethylamine to perform neutralizing and salifying after cooling, adding water for emulsifying, evaporating out a solvent to prepare a semi-transparent waterborne polyurethane macromonomer; adding acrylate monomer mixed liquor which is mixed with initiator potassium persulfate and contains acrylic phosphate for carrying out polymerization reaction to prepare the self-phosphating waterborne polyurethane acrylate emulsion. A paint dropped in a coating process of the self-phosphating waterborne polyurethane acrylate paint can be recycled, and can be self-phosphated to avoid a surface phosphating treatment process; moreover, the flexibility, compactness and flash erosion resistance of the cured coating can satisfy the coating performance of a car axle steel plate.

Description

technical field [0001] The invention belongs to the field of polymer material preparation, and in particular relates to a self-phosphating polyurethane acrylate resin used in an automobile axle coating production line and a preparation method thereof. Background technique [0002] China's auto industry has not paid enough attention to the coating of axle steel plates. After a period of use, it is covered with scratches and rust. The axle is located at the bottom of the car, and it is in a bad environment, that is, it has been subjected to sand and stone impact and rain erosion for a long time. The new fatigue source of the steel plate affects the fatigue life of the axle steel plate. At present, acrylate coatings and amino resin coatings are widely used for axle coatings on the market. These coatings have good water resistance, corrosion resistance and aging resistance, but poor wear resistance, which cannot meet the requirements of axle coatings. And after investigation, ...

Claims

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Application Information

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IPC IPC(8): C08F283/00C08F230/02C08G18/67C08G18/48C08G18/12C09D151/08C09D5/08
Inventor 刘胜波沈珍慧张瑜虞伟逸董文华王威薛磊张抗彭刚军刘柳张良均
Owner 岳阳海玖科技有限公司
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