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Waterborne acrylic acid modified alkyd pre-coating primer for railway vehicle and preparation method of pre-coating primer

A technology of water-based acrylic and railway vehicles, which is applied in coatings, anti-corrosion coatings, etc., and can solve problems such as poor water resistance of paint films, high organic solvent content, and high viscosity of emulsions

Inactive Publication Date: 2019-04-02
ANPING JINLONG VEHICLE EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the disadvantages of high emulsion viscosity, poor water resistance of the paint film, and high organic solvent content.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] The first step is to prepare water-based resin

[0074] Step (1), weighing the raw materials for preparing water-based resin

[0075] Weigh 4 kg of vegetable oil; 2.5 kg of polyol; 0.004 kg of catalyst; 2 kg of saturated dibasic acid; 2 kg of unsaturated dibasic acid; 1 kg of acrylic acid; 1 kg of methacrylic acid; 3 kg of butyl acrylate; 2 kg of styrene 2 kg of cosolvent; 1.5 kg of neutralizer; 1 kg of xylene; 0.2 kg of initiator; 52 kg of demineralized water with conductivity ≤10 μS / cm;

[0076] In the second step, put vegetable oil and polyols into the four-necked bottle in proportion, heat up to 120°C, put in the catalyst, continue to heat up to 230°C, keep warm for 1.5 hours, and then cool down to 180°C;

[0077] Step (3), add the formula amount of saturated dibasic acid, 5% reflux xylene, and reflux esterification at 210°C for 1 hour;

[0078] Step (4), add measured unsaturated dibasic acid, keep it warm at 230°C for 2 hours, measure the acid value and viscosit...

Embodiment 2

[0094] The first step is to prepare water-based resin

[0095] Step (1), weighing the raw materials for preparing water-based resin

[0096] Weigh 8.5 kg of vegetable oil; 4.5 kg of polyol; 0.012 kg of catalyst; 4 kg of saturated dibasic acid; 4 kg of unsaturated dibasic acid; 2 kg of acrylic acid; 2 kg of methacrylic acid; 5 kg of butyl acrylate; 4 kg of styrene ; 4 kg of cosolvent; 3 kg of neutralizer; 2 kg of xylene; 0.6 kg of initiator; 65 kg of demineralized water with conductivity ≤ 10 μS / cm;

[0097] In the second step, put vegetable oil and polyols into the four-necked bottle in proportion, heat up to 130°C, put in the catalyst, continue to heat up to 240°C, keep the temperature for 2 hours, and after measuring the alcoholysis tolerance, cool down to 190°C. ℃;

[0098] In the third step, add saturated dibasic acid in the formula amount, 5% reflux xylene, and reflux esterification at 220°C for 1 hour;

[0099] Step (4), add measured unsaturated dibasic acid, keep war...

Embodiment 3

[0115] The first step is to prepare water-based resin

[0116] Step (1), weighing the raw materials for preparing water-based resin

[0117] Weigh 6 kg of vegetable oil; 3.5 kg of polyol; 0.008 kg of catalyst; 3 kg of saturated dibasic acid; 3 kg of unsaturated dibasic acid; 1.5 kg of acrylic acid; 1.5 kg of methacrylic acid; 4 kg of butyl acrylate; 3 kg of styrene 3 kg of cosolvent; 2.5 kg of neutralizer; 1.5 kg of xylene; 0.4 kg of initiator; 60 kg of demineralized water with conductivity ≤10 μS / cm;

[0118] In the second step, put vegetable oil and polyols into the four-necked bottle in proportion, heat up to 125°C, put in the catalyst, continue to heat up to 235°C, keep warm for 1.8 hours, and after the alcoholysis tolerance is qualified, cool down to 185°C;

[0119] In the third step, add saturated dibasic acid and 5% refluxing xylene in the prescribed amount, and reflux esterification at 215°C for 1 hour;

[0120] Step (4) Add measured amount of unsaturated dibasic ac...

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Abstract

The invention belongs to the technical fields of pre-coating primers and preparation methods thereof. The invention discloses a waterborne acrylic acid modified alkyd pre-coating primer for a railwayvehicle and a preparation method of the pre-coating primer. The main technical characteristics of the pre-coating primer are that the waterborne acrylic acid modified alkyd pre-coating primer for therailway vehicle comprises water-based resin, wherein the water-based resin is prepared from the following components in parts by weight: 2-4 parts of plant oil, 1.29-1.47 parts of a polyhydric alcohol, 20-40 parts of saturated binary acid, 20-40 parts of unsaturated binary acid, 10-20 parts of acrylic acid, 10-20 parts of methacrylic acid, 1.5-2.0 parts of butyl acrylate, 20-40 parts of styrene, 20-40 parts of a cosolvent, 15-30 parts of a neutralizer, 10-20 parts of xylene, 0.01-0.03 part of an initiator, and 29-32.5 parts of softened water with conductivity of less than or equal to 10 [mu]S / cm. The resin is used for preparing the pre-coating primer which is a polymer taking lipophilic alkyd as a core and taking a hydrophilic acrylate copolymer as a shell. The particle size is small, compactness of the obtained paint film is high, the adhesive force is strong, and corrosion resistance is good.

Description

technical field [0001] The invention belongs to the technical field of paints and paint preparation methods, and in particular relates to a water-based acrylic modified alkyd precoat primer for railway vehicles and a preparation method thereof. Background technique [0002] Pre-coating primers are widely used in the preparation of railway vehicles to protect steel after blasting, and to prevent rust during storage or processing. At present, most of the commonly used precoating primers are solvent-based precoating primers, including alkyd precoating primers, polyvinyl butyral phosphating precoating primers, epoxy precoating primers, and epoxy zinc-rich workshops. Several types such as pre-primed. Among them, the alkyd precoat primer is cheap and easy to get, and the dosage is relatively large. [0003] With its irreplaceable excellent characteristics, alkyd paint has always occupied a considerable proportion in the field of traditional prepainted primers. With the improvem...

Claims

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Application Information

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IPC IPC(8): C09D151/08C09D5/08C09D7/61C09D7/63C09D7/65C08G63/52C08G63/83C08F283/01C08F220/06C08F220/18C08F212/08
CPCC08F283/01C08G63/52C08G63/83C08K2003/2227C08K2003/2272C08K2003/2296C08K2003/327C08K2201/014C08L2207/53C09D5/08C09D7/61C09D7/63C09D7/65C09D151/08C08L1/284C08K13/02C08K3/22C08K3/34C08K3/32C08K5/053C08K5/098C08F220/1804
Inventor 马涛
Owner ANPING JINLONG VEHICLE EQUIP
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