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A kind of cathodic electrophoretic paint for leaf spring and preparation method thereof

A technology of cathodic electrophoresis and leaf spring, applied in the field of electrophoretic paint, can solve the problems of low utilization rate, high price, VOC volatilization, etc.

Inactive Publication Date: 2019-09-06
湖北同邦达科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] C. Water-based paint (spray paint), which adopts air pressure spraying process, is expensive and has low utilization rate;
[0008] D. Oil-based paint (dip-coating paint), which adopts dip-coating process, has the problem of uneven thickness of the paint, and a large amount of VOC will volatilize during the production process;
[0009] E. Water-based paint (dipping paint), using dip coating process, there is a problem of uneven thickness of paint

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0047] In an optional embodiment, the preparation method of the cathodic electrophoretic paint for leaf springs comprises:

[0048] When the epoxy value of the epoxy resin is less than 0.4, put the epoxy resin, epoxy diluent and solvent in the reaction kettle, heat up to 60-100°C, when the epoxy value decreases to 0.07-0.12, continue to add Solvent, when the solution is leveled to a glass state, a toughened epoxy resin is obtained.

[0049] It should be noted that the solvent in the present invention includes: xylene, ethyl acetate, butyl acetate, ethylene glycol monobutyl ether, ethylene glycol monobutyl ether acetate, propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate , propylene glycol monophenyl ether, methyl ethyl ketone, methyl isobutyl ketone or one or more.

[0050] In a preferred embodiment, the solvent is xylene.

[0051] In an optional embodiment, when the epoxy value of the epoxy resin is greater than 0.4, mix the epoxy resin, the chain ...

Embodiment 1

[0075] Put 1600 parts of E-12, 1000 parts of E-20, 1000 parts of polypropylene glycol diglycidyl ether (epoxy value=0.20), 764 parts of polypropylene glycol diglycidyl ether (epoxy value=0.33), and 200 parts of xylene Put it into the reaction kettle, slowly raise the temperature to 100°C, after the material is completely dissolved, add 105 parts of diethanolamine, after reacting at 100°C for 1 hour, add 235 parts of propylene glycol monomethyl ether, 450 parts of ethylene glycol monobutyl ether acetate, Add 141 parts of monoethanolamine, react at 110°C for 2 hours, add 404 parts of polyamide (amine value=320±10mgKOH / g), and react for 2 hours, add 1000 parts of ethylene glycol monobutyl ether, cool to 90°C, add 1600 parts of cross-linking agent, lower the temperature to 70°C, add 2 parts of Tween-40, 2.4 parts of OP-7, 2.4 parts of OP-15, and stir for 1 hour. At 60°C, 117 parts of acetic acid and 176 parts of lactic acid were added and stirred for 0.5 hours. The resin was disc...

Embodiment 2

[0077] Put 1600 parts of E-12, 1000 parts of E-20, 1000 parts of polypropylene glycol diglycidyl ether (epoxy value=0.20), 764 parts of polypropylene glycol diglycidyl ether (epoxy value=0.33), and 200 parts of xylene Put it into the reaction kettle, slowly raise the temperature to 100°C, after the material is completely dissolved, add 105 parts of diethanolamine, and react at 100°C for 1 hour, add 235 parts of propylene glycol monomethyl ether, 450 parts of ethylene glycol monobutyl ether acetate, Add 141 parts of monoethanolamine, react at 110°C for 2 hours, add 404 parts of polyamide (amine value=320±10mgKOH / g), and react for 2 hours, add 1000 parts of ethylene glycol monobutyl ether, cool to 90°C, add 1600 parts of cross-linking agent, lower the temperature to 70°C, add 2 parts of Tween-40, 2.4 parts of OP-7, 2.4 parts of OP-15, and stir for 1 hour. At 60°C, 117 parts of acetic acid and 176 parts of lactic acid were added and stirred for 0.5 hours. The resin was discharge...

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Abstract

The invention provides cathode electrophoretic paint for a plate spring and a preparation method of the cathode electrophoretic paint. The cathode electrophoretic paint comprises epoxy resin; when the epoxy value of the epoxy resin is smaller than 0.4, the cathode electrophoretic paint further comprises epoxy diluent; on the contrary, the cathode electrophoretic paint further comprises a chain extender; and the epoxy diluent and the chain extender are flexible chain compounds. According to the epoxy value of the epoxy resin, the epoxy diluent or the chain extender of the flexible chain compound is added in the raw materials, the brittleness of the cathode electrophoretic paint is reduced, then stone crash resistance is improved, and meanwhile, salt fog resistance is improved.

Description

technical field [0001] The invention relates to the technical field of electrophoretic paint, in particular to cathodic electrophoretic paint for leaf springs and a preparation method thereof. Background technique [0002] Leaf Spring Leaf Spring is the most widely used elastic element in automobile suspension. It is an elastic beam of approximately equal strength composed of several alloy spring sheets of equal width but unequal length. The thickness of each alloy spring sheet can be equal or not. [0003] Since the leaf spring is installed on the bottom of the car, the paint used for the leaf spring will withstand constant stone impact and requires strong salt spray resistance. In the prior art, the raw material of the leaf spring is mostly epoxy resin or epoxy resin. The combination of resin and bisphenol A, but because the epoxy resin is relatively hard, after it is made into electrophoretic paint and coated on the leaf spring, it has the problems of high brittleness an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D163/00C09D5/44C08G59/22
Inventor 周雪科徐明兵
Owner 湖北同邦达科技有限公司
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