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Medium thickness anodic electro phoresis paint and its production method

An anode electrophoresis and production method technology, applied in electrophoretic coatings, coatings, etc., can solve the problems of low gloss of the coating film, poor color wrapping, poor H-board effect, etc.

Inactive Publication Date: 2004-10-20
上海金力泰化工股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the rapid development of the automobile industry, the primer coating of automobiles (including agricultural vehicles) and their parts has higher and higher requirements for the performance and stability of electrophoretic coatings. Epoxy esters, alkyds, phenolic aldehydes, etc. Anodic electrophoretic coatings have defects such as poor throwing power, coulombic efficiency, and bath stability, etc., especially in terms of salt spray resistance. ) (Chinese Patent Publication No. 1079762) as a representative of the anodic electrophoretic coating also has the defects of poor mechanical properties (cup less than 4mm, bending 3mm) and the presence of resin slightly poor color wrapping, low coating gloss, poor H plate effect, etc. At the same time, although the mechanical performance of the anodic electrophoretic coating of polyether resin modified polybutadiene with the patent (Chinese Patent Publication 1069506A) meets the requirements, there is a difference in the salt spray resistance (about 200 hours). At the same time, the above two patent reports The film thickness of the product is less than 25μm

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0038] The preparation method of resin composition for coating:

[0039] Coating resin composition 1

[0040] Prepare 500g of carboxyl-containing polybutadiene composition A, prepare oil-modified carboxyl-containing polybutadiene composition B300g, prepare hydroxyl-containing poly(meth)acrylic acid (ester) composition C200g, mix and heat to 120°C, And after keeping it warm at this temperature for 2 hours, cool down to 85°C, add 100g of neutralizing agent triethylamine, 80g of deionized water, 6g of antifungal agent, and 8g of surfactant, and mix evenly at 80°C for 30 minutes to obtain a solid content of 70.4 %(160°C / 40min) resin, its 8.0% solid resin solution, pH at 25°C: 8.20, electrical conductivity 950 μs / cm, breakdown voltage 300 volts.

[0041] Coating resin composition 2

[0042] Mix and heat 600 g of the carboxyl-containing polybutadiene composition A and the oil-modified carboxyl-containing polybutadiene composition B 400 g to 120° C., keep the temperature at this te...

preparation example A

[0051] In the sand mill, the following formula (prepared resin composition 1 240g, rutile titanium dioxide pigment 180g, silicate-based commercially available filler 80g, ultrafine precipitated barium sulfate 60g, anti-corrosion pigment 15g, defoaming 1g of deionized water, 430g of deionized water) were mixed and ground for 60 minutes, and the solid content of the obtained pigment slurry was 50%, and the fineness was 20 μm. In the paint mixing tank, the amount of materials (prepared resin composition 1950g, ground pigment slurry) was added 1000g, deionized water 380g), stirred at high speed for 30 minutes, prepared a coating with a solid content of 50%, and a 12% dilution of the coating. After aging for 24 hours at 25°C, the pH value was detected to be 8.12, and the conductivity was 1100 micro-Siemens. On the galvanized phosphating steel plate (Bonder 132), the bath temperature is 27°C, the voltage is 190V, the time is 2 minutes, and the baking condition is 170°C / 30min.

preparation example B

[0053] Resin Composition 1 in Coating Preparation Example A was replaced by Coating Resin Composition 2, and the solid content of the prepared coating was 12% diluted. After aging for 24 hours at 25°C, the pH value was 7.69 and the conductivity was 1250 microsiemens. , The paint solution is on the galvanized phosphating steel plate (Bonder 132), the bath temperature is 27°C, the voltage is 190 volts, the time is 2 minutes, and the baking condition is 170°C / 30min.

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Abstract

A medium (or thick)-film anode electrophoresis paint is prepared from carboxy polybutadiene, oil modified carboxy polybutardiene and hydroxy polymethyl acrylate, through proportional mixing, adding alkaline neutralizer, adding pigment and fillering, grinding, adding resin and high-speed stirring. Its advantages are high electrophoresis penetrability, low lustre and high mechanical performance.

Description

1. Technical field: [0001] The invention relates to a water-dilutable composition, more specifically to a medium-thick film anodic electrophoretic paint and a production method. It includes a carboxyl polybutadiene polymer A, an oil-modified polybutadiene carboxyl polymer B, a hydroxyl-containing poly(meth)acrylate (ester) polymer C, three The two polymers are mixed in a certain proportion and neutralized by adding an appropriate amount of alkaline neutralizer to form a composition that can be diluted with water. Then, pigments, filler materials, etc. are added to the composition, and after being ground to a qualified fineness, It is made by adding an appropriate amount of resin and stirring evenly at high speed. It has the characteristics of strong throwing power, good color encapsulation by resin, low gloss of coating film, and good mechanical properties. 2. Background technology: [0002] With the rapid development of the automobile industry, the primer coating of automo...

Claims

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Application Information

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IPC IPC(8): C09D5/44C09D147/00
Inventor 刘海军
Owner 上海金力泰化工股份有限公司