CN101768401A

CN101768401A - Manufacturing method of low-temperature curing electrophoretic coating

Info

Publication number: CN101768401A
Application number: CN200910116006A
Authority: CN
Inventors: 刘玉
Original assignee: TONGLING LINGYANG CHEMICAL CO Ltd
Current assignee: TONGLING LINGYANG CHEMICAL CO Ltd
Priority date: 2009-01-03
Filing date: 2009-01-03
Publication date: 2010-07-07

Abstract

The invention discloses a manufacturing method of low-temperature curing acrylic acid anode electrophoretic coating, to be concretely, acidic catalyst sulfonic acid or sulfonate is added into the reaction system to reduce the curing temperature of the coating to 140-150 DEG C, which is applicable to the coating of automobile parts with plastic and rubber, and reducing consumption of energy and discharge of pollutants.

Description

A kind of manufacture method of low-temperature curing electrophoretic coating

Technical field

The present invention relates to a kind of manufacture method of electrophoretic paint, relate in particular to a kind of manufacture method of low-temperature curing acrylic anodic electrophoretic coating.

Background technology

As everyone knows, electrophoretic paint is owing to it has good non-corrosibility, high permeability ratio, high-leveling, high-decoration and application level of automation height, characteristics such as few are polluted in application, be widely used in the automotive industry, and promote the use of the surface anticorrosion and the decoration of industrial circles such as building materials, light industry, household electrical appliance and five metals and artwork.At present, the electrophoretic paint storing temperature of selling on the market is 170～180 ℃ substantially, at high temperature toasts easy generation distortion for the automobile component that have plastics, rubber etc., and this has just produced the desirability of exploitation low temperature curing type electrophoretic paint.The advantage of low-temperature curing electrophoretic coating is to reduce energy expenditure, reduces cost, and improves environmental pollution, reduces the look change of paint film because of baking, thereby improves film quality.150 ℃ of solidified cathode electrophoresis dopes have been released at present, as the ED-6 of PPG company; The 3rd generation of Herberts company and the 4th generation product, the lower limit of its storing temperature also is 150 ℃.According to another report, the cathode electrophoresis dope of the CED of called after a new generation that India succeeds in developing has the baking tolerance of broad, can toast in 140～220 ℃ of temperature ranges, and its standard baking condition is 150 ℃, 20 minutes.Though to solidification value is that a lot of work have been done in 150 ℃ of development researches down to lower electrophoretic paint, a lot of patents occurred, sophisticated commodity are also rare.

Summary of the invention

The present invention be directed at present existing acrylic anodic electrophoretic coating solidification value height, the defective that energy consumption is high proposes the manufacture method of a kind of advanced person's low-temperature curing electrophoretic coating.

The present invention realizes like this, in the boiling reaction process before the acrylic anodic electrophoretic coating work in-process of routine are made, add the sulfonic acid or the sulfonate solution that account for system gross weight 0.5～1%, the reinforced hierarchy of control boiling reaction 60 minutes of finishing, Wei Wen reacts end, add a small amount of initiator again, keep conventional operations such as boiling reaction cools after 30 minutes again.

The present invention compares with the manufacture method of existing acrylic anodic electrophoretic coating, by selecting hydrophobicity an acidic catalyst sulfonic acid or the sulfonate that is complementary for use, make the crosslinking temperature of the aminoresin under the katalysis be minimized, thereby the solidification value that makes this coating can be reduced to 140～150 ℃, not only help having the application of the automobile component of plastics and rubber, and reduced the quantity discharged of energy consumption and pollutent.

Embodiment

Among the embodiment of the following stated, except that specializing, inventory all is meant weight.

Embodiment one

105 parts of the propylene glycol monomethyl ethers that (1) will measure are put into reactor, start stirring apparatus for reaction kettle, heat and are warming up to boiling state;

(2) kept the interior boiling reaction of still 30 minutes, after treating that the warm technology of boiling dimension finishes, beginning evenly drips 14 parts of methacrylic acids, 72 parts of methyl methacrylates, 86 parts of butyl methacrylate, 36 parts of methacrylic acid-beta-hydroxy ethyl esters, 4 parts of vinylbenzene, 2.5 parts of initiators, 1 part of compound of chain-transfer agent, drip after 30 minutes, begin 10 parts of even addition polymerization ketone resins, 40 parts of mixing materials of cross-linked resin to still, and keep reaction system and be in boiling state, the dropping time is controlled at 240 minutes scopes;

(3) wait to drip end, maintenance system boiling reaction 120 minutes is added 0.5 part of initiator again, keeps boiling reaction 60 minutes;

(4) wait to tie up the temperature reaction and finish, begin cooling, be cooled to 80 ℃, left standstill 60 minutes, be warming up to boiling reaction again 60 minutes;

(5) beginning slowly adds 1 part of propylene glycol monomethyl ether, catalyzer sulfonic acid or 3 parts of compounds of sulfonate, the reinforced hierarchy of control boiling reaction 60 minutes of finishing, and the reaction of dimension temperature finishes, and adds 0.5 part of initiator again, keeps boiling reaction minute, begins to cool down cooling;

When (6) cooling to 85 ℃ again, 12 parts of quadrols, 112.5 parts of mixing materials of aquae destillata are evenly added in the reactor, regulate the pH value of system, continue again to stir 30 minutes, obtain being the work in-process of golden yellow state liquid;

(7) the mill base masterbatch of finished product is made: with 50 parts of pigment, 100 parts of propylene glycol monomethyl ethers, 215 parts of aquae destillatas, 2 parts of quadrols, 0.5 part of dispersion agent, add successively in the scuffing of cylinder bore by ratio requirement, blending dispersion is after 30 minutes, enters next procedure after depositing 24h.100 parts of the work in-process of adding formula rate, after disperseing 30 minutes with high speed dispersor, grind 3～6 times by sand mill, the control fineness is in 30 microns, add 275 parts of fillers again, after high speed dispersor disperses 30 minutes, grind 3～6 times by sand mill, control its fineness in 30 microns, promptly form the mill base masterbatch;

(8) with 500 parts of work in-process, 80 parts of mill base masterbatch, 10 parts of propylene glycol monomethyl ethers, 100 parts of aquae destillatas, 3 parts of auxiliary agents, 3 parts of the worn-out agent of nano level optical screen, 3 parts of UV light absorber, metering also places scuffing of cylinder bore, disperseed 30 minutes through high speed dispersor, grind through sand mill, control its fineness and be not more than 25 microns, promptly become finished product coating.

Claims

1. the manufacture method of a low-temperature curing acrylic anodic electrophoretic coating, it is characterized in that: in the boiling reaction process before the acrylic anodic electrophoretic coating work in-process of routine are made, add the sulfonic acid or the sulfonate solution that account for system gross weight 0.5～1%, the reinforced hierarchy of control boiling reaction 60 minutes of finishing, Wei Wen reacts end, add a small amount of initiator again, keep conventional operations such as boiling reaction cools after 30 minutes again.