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A kind of self-phosphating water-based polyurethane acrylate resin for vehicle 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: 2016-05-25
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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  • A kind of self-phosphating water-based polyurethane acrylate resin for vehicle axle and preparation method thereof
  • A kind of self-phosphating water-based polyurethane acrylate resin for vehicle axle and preparation method thereof
  • A kind of self-phosphating water-based polyurethane acrylate resin for vehicle axle and preparation method thereof

Examples

Experimental program
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preparation example Construction

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

[0035] 1) Polyether diol, diisocyanate, dimethylol propionic acid (DMPA), and 1,4-butene diol are used for chain extension reaction to obtain isocyanate-terminated water-based polyurethane prepolymer; among them— The molar ratio of NCO to —OH is 1.3-1.8; the amount of dimethylol propionic acid accounts for 4-7wt% of the waterborne polyurethane prepolymer; the amount of 1,4-butene diol accounts for 1% of the waterborne polyurethane prepolymer -4wt%; the chain extension reaction temperature is 70-80°C, the reaction time is 3-5h, during which acetone is used to adjust the viscosity of the system;

[0036] 2) Add hydroxyethyl acrylate (HEA) to the isocyanate-terminated polyurethane prepolymer for capping reaction. After cooling down, add triethylamine to neutralize and form a salt, add water to emulsify, and evaporate the solvent to obtain trans...

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-phosphorizing polyurethane acrylate resin used in an automobile axle coating production line and a preparation method thereof. Background technique [0002] The Chinese auto industry has not paid enough attention to the coating of axle steel plates. After a period of use, they are covered with scratches and rust. The axle is located at the bottom of the car, and the environment is relatively harsh, that is, it has been subjected to sand and stone impact and rain erosion for a long time. The impact of sand and stone is easy to scratch the coating, and the protective steel plate without coating is more likely to rust, and the rust spots become the bridge. A new fatigue source for the steel plate affects the fatigue life of the axle steel plate. At present, acrylic paints and amino resin coatings are widely used in axle coatings on the market. These co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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