CN1160426C

CN1160426C - Water-based metal paint

Info

Publication number: CN1160426C
Application number: CNB021334544A
Authority: CN
Inventors: 刘长源
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-07-10
Filing date: 2002-07-10
Publication date: 2004-08-04
Anticipated expiration: 2022-07-10
Also published as: CN1405246A

Abstract

The present invention belongs to a paint composition which is water-based metallic paint and is characterized in that the paint composition has initial raw material comprising styrene, methyl methacrylate, butyl acrylate and acrylic acid. The paint composition is prepared in the three processes of the preparation of a pit monomer and a shell monomer, the synthesization of nonsoap pit shell resin emulsion and the preparation of water-like metal paint. The paint composition has the advantages of no poison, no smell and no combustion. Because a content is no less than 50%, viscosity is from 35 to 40 seconds (a coating 4-cup method), adhesive force is at the first level, fineness is 40 mum, surface drying time (25 DEG C) is ten minutes, hardness after film forming (a swing link sclerometer) is 0.30, impact strength is no less than 50 Kg/cm2, and flexibility is 1mm. The paint composition has the advantages of rustiness resistance and acid and base resistance, the paint composition can be widely used as the primary paint, the middle paint and the surface decoration of metal pieces.

Description

A kind of aqueous metallic paint

One, technical field

The invention belongs to coating composition, be specifically related to a kind ofly, particularly a kind ofly be used for that hardware is antirust, anticorrosion, the aqueous metallic paint of middle level coating, surface decoration based on the homopolymer of one or more unsaturated aliphatic based compounds or the coating composition of multipolymer.

Two, background technology

At present, be used on the metalwork primary coat, be coated with and surface daub on a wall, all adopt traditional paint basically, human body and environment are caused serious harm and pollution.There was the application of a CN1076948A Chinese invention patent open on October 6th, 1993, it is the water-based anticorrosive paint of a kind of direct brushing on steel part, its technical characterictic is, after making epoxy phosphate ester by macromolecular bisphenol A type Resins, epoxy and phosphatase reaction, carry out graft copolymerization and introduce hydroxyl with vinylformic acid and esters monomer thereof, make ammonium salt with the organic tertiary amine neutralization again, mixing mutually with the poly-hydroxy thermosetting phenolic compound made from dihydroxyphenyl propane, cresols and phenol and so on polyphenol and formaldehyde, is 25-38% with distilled water diluting to solids content at last again.But this water-based anticorrosive paint will use poisonous industrial chemicals such as formaldehyde, phenol in manufacturing processed, human body and environment are still existed serious harm and pollution, and its solid content is lower simultaneously, and use range has certain limitation.

Three, summary of the invention

Purpose of the present invention, be defective at above-mentioned prior art, employing is different from the raw material technological line of prior art, produce a kind of solid content height, it is antirust to be widely used in metalwork, anticorrosion bottoming, the brushing on middle-class and surface, applied widely, use easy to operate environment-friendly type aqueous metallic paint.

Realize purpose of the present invention by the following technical solutions.

A kind of aqueous metallic paint, with vinylbenzene, methyl methacrylate, butyl acrylate and vinylformic acid are starting raw material, it is characterized in that its preparation through nuclear monomer and shell monomer, three step of the allotment process of the synthetic and aqueous metallic paint of soap-free core-shell resin emulsion and preparing:

1, the preparation of nuclear monomer and shell monomer

The weight part proportioning of nuclear monomer and the raw materials used component of shell monomer is as follows:

Feed composition nuclear monomer shell monomer

Vinylbenzene 42-46 3-5

Methyl methacrylate 2-5 2-5

Butyl acrylate 7-10 32-35

Vinylformic acid 1.5-2.0 2.0-2.5

Press nuclear monomer and the shell monomer weight part proportional quantity of raw materials used component separately, in reactor, add vinylbenzene earlier, add methyl methacrylate, butyl acrylate and vinylformic acid then under stirring at normal temperature, mixing and stirring makes nuclear monomer and shell monomer respectively.

2, the soap-free core-shell resin emulsion is synthetic

The weight part proportioning of the raw materials used component of soap-free core-shell resin emulsion is: nuclear monomer 55-58, shell monomer 45-48, ammonium persulphate (initiator) 0.1-0.3, bicarbonate of ammonia (buffer reagent) 0.1-0.3, deionized water 43-46; Weight part proportional quantity by feed composition is got the raw materials ready, earlier whole deionized waters are joined in the reactor, the nuclear monomer of getting half amount again drops in the reactor, under the whipped state of 40 ℃ of temperature controls, allow it react 10-20 minute, be warming up to 65 ℃ of ammonium persulphate and bicarbonate of ammonia that add 1/3 amount then, be warming up to 75 ℃, make initiated polymerization to material be blue light, constant temperature 15-20 minute; Ammonium persulphate and bicarbonate of ammonia with last nuclear monomer and 1/3 amount was added dropwise in the reactor in 35 minutes again, at 80 ℃ of constant temperature 15-20 minutes, then shell monomer and remaining 1/3 amount ammonium persulphate and bicarbonate of ammonia were added dropwise in the reactor in 40 minutes, and temperature control was 80 ℃ of reactions 1-1.5 hour, be cooled to 30-40 ℃ at last and regulate pH value to 7-8, obtain the soap-free core-shell resin emulsion, its residue is less than 0.3%, and transformation efficiency is that 95% rotary viscosity is at 3000-4000mP.a.s.

3, the allotment of aqueous metallic paint

The weight part proportioning of the raw materials used component of allotment aqueous metallic paint is: soap-free core-shell resin emulsion 50-80, metal antirusting agent 1-3, thickening material 3-5, dispersion agent 1-3, defoamer 0.1-0.5, deionized water 20-40, filler 10-30;

Its concocting method is, presses the weight part proportional quantity of feed composition, earlier dispersion agent, metal antirusting agent, membrane-forming agent, defoamer, deionized water and filler joined in a mixing bowl, and high speed dispersion stirred 15 minutes; Change the interior dispersion grinding of sand mill 45 minutes over to, the material fineness is reached below the 40 μ m; Change over to again in the paint still, under stirring at a slow speed, add the soap-free core-shell resin emulsion, continue to stir 10 minutes, regulate pH value to 8-9, add thickening material make material viscosity (being coated with 4 agar diffusion methods) reach 〉=35 seconds, promptly obtain a kind of aqueous metallic paint product.Allocate preferably 2-amino-2-methyl-1-propanol of the used dispersion agent of aqueous metallic paint of the present invention, used metal antirusting agent is the Sodium Nitrite dicyclohexyl amine preferably, membrane-forming agent is 2-Butoxyethyl acetate preferably, defoamer is the silicone oil defoamer preferably, thickening material preferably SNThickener636 (Germany. Henkel Corp. produces).

Aqueous metallic paint of the present invention can need add colorant by the user, is modulated into the product of different color.Aqueous metallic paint of the present invention, does not burn at nontoxic, free from extraneous odour, solid content 〉=50%, and viscosity 35-40 second (being coated with 4 agar diffusion methods), sticking power: 1 grade, fineness: 40 μ m, surface drying time (25 ℃) 10 minutes; Hardness after the film forming (pendulum-rocker hardness meter): 0.30, shock strength 〉=50Kg/cm ², snappiness: 1mm immerses 168 hours non-corrodings in distilled water and 3% salt solution, soaks 48 hours no changes in saturated Ca (OH) 2 solution.The antirust bottoming and the surface decoration of the interior exterior wall of metal productss such as it can be widely used in chemical industry, machinery, pipeline, vehicle, boats and ships, highway and railroad bridge, offshore oil platform and buildings etc.

Four, embodiment

The embodiment of aqueous metallic paint of the present invention is described with an embodiment.

1, the preparation of nuclear monomer and shell monomer

In reactor, add earlier 45 kilograms of vinylbenzene, under stirring at normal temperature, add 2 kilograms in 4 kilograms of methyl methacrylates, 9 kilograms of butyl acrylates and vinylformic acid then, mixing and stirring, it is standby to make 60 kilograms of nuclear monomers; In reactor, add 4 kilograms of vinylbenzene earlier, under stirring at normal temperature, add 5 kilograms of methyl methacrylates then, 2 kilograms in 34 kilograms of butyl acrylates and vinylformic acid, mixing and stirring, it is standby to make 45 kilograms of shell monomers.

2, the soap-free core-shell resin emulsion is synthetic

Earlier 44 kilograms of deionized waters are joined in the reactor, getting 28 kilograms of nuclear monomers again drops in the reactor, under the whipped state of 40 ℃ of temperature controls, allow it react 15 minutes, be warming up to 65 ℃ then and add 80 gram ammonium persulphates and 80 gram bicarbonate of ammonia, be warming up to 75 ℃, make material be blue light through initiated polymerization, constant temperature 15-20 minute, with 28 kilograms of nuclear monomers, each 80 gram of ammonium persulphate and bicarbonate of ammonia were added dropwise in the reactor in 35 minutes, at 80 ℃ of constant temperature 15-20 minutes again; Then each 80 gram of 45 kilograms of shell monomers, ammonium persulphate and sodium bicarbonates were added dropwise in the reactor in 40 minutes, and temperature control was 80 ℃ of reactions 1-1.5 hour, be cooled to 30 ℃ at last, regulate pH value to 7-8, obtaining a kind of cancellated composite polymeric does not have 130 kilograms of neat soap resin emulsion.

3, the allotment of aqueous metallic paint

With 2 kilograms of 2-amino-2-methyl-1-propanols (dispersion agent), 2 kilograms of Sodium Nitrite dicyclohexyl amines (metal antirusting agent), 2 kilograms of 2-Butoxyethyl acetates (membrane-forming agent), silicone oil defoamer 300 grams, 30 kilograms of deionized waters and titanium dioxide join in a mixing bowl for 20 kilograms, carrying out high speed dispersion stirred 15 minutes, make it to mix is body, change over to then in the sand mill and ground 45 minutes, regulate pH value to 8-9, add SNThickener636 (thickening material) 4 kilograms, make material viscosity (being coated with 4 agar diffusion methods) 〉=35 seconds, obtain a kind of aqueous metallic paint at last.

Claims

1, a kind of aqueous metallic paint, with vinylbenzene, methyl methacrylate, butyl acrylate and vinylformic acid are starting raw material, it is characterized in that its is through three step of the allotment process of the synthetic and aqueous metallic paint of the preparation of nuclear monomer and shell monomer, soap-free core-shell resin emulsion and prepare:

1), the preparation of said nuclear monomer and shell monomer is that the weight part proportioning of the raw materials used component of nuclear monomer is vinylbenzene 42-46, methyl methacrylate 2-5, butyl acrylate 7-10, vinylformic acid 1.5-2.0; The weight part proportioning of the raw materials used component of shell monomer is vinylbenzene 3-5, methyl methacrylate 2-5, butyl acrylate 32-35, vinylformic acid 2.0-2.5; Press nuclear monomer and the shell monomer weight part proportional quantity of raw materials used component separately, in reactor, add vinylbenzene earlier, add methyl methacrylate, butyl acrylate and vinylformic acid then under stirring at normal temperature, mixing and stirring makes nuclear monomer and shell monomer respectively;

2), the synthetic of said soap-free core-shell resin emulsion is that the weight part proportioning of its raw materials used component is nuclear monomer 55-58, shell monomer 45-48, ammonium persulphate 0.1-0.3, bicarbonate of ammonia 0.1-0.3, deionized water 43-46; Weight part proportional quantity by feed composition is got the raw materials ready, earlier whole deionized waters are joined in the reactor, the nuclear monomer of getting half amount again drops in the reactor, under the whipped state of 40 ℃ of temperature controls, allow it react 10-20 minute, be warming up to 65 ℃ of ammonium persulphate and bicarbonate of ammonia that add 1/3 amount then, be warming up to 75 ℃, make initiated polymerization to material be blue light, constant temperature 15-20 minute; Ammonium persulphate and bicarbonate of ammonia with last nuclear monomer and 1/3 amount was added dropwise in the reactor in 35 minutes again, at 80 ℃ of constant temperature 15-20 minutes, then shell monomer and remaining 1/3 amount ammonium persulphate and bicarbonate of ammonia were added dropwise in the reactor in 40 minutes, and temperature control was 80 ℃ of reactions 1-1.5 hour, be cooled to 30-40 ℃ at last and regulate pH value, obtain the soap-free core-shell resin emulsion to 7-8;

3), the allotment of said aqueous metallic paint is that the weight part proportioning of its raw materials used component is soap-free core-shell resin emulsion 50-80, metal antirusting agent 1-3, thickening material 3-5, dispersion agent 1-3, defoamer 0.1-0.5, deionized water 20-40, filler 10-30; Press the weight part proportional quantity of feed composition, earlier dispersion agent, metal antirusting agent, membrane-forming agent, defoamer, deionized water and filler are joined in a mixing bowl, high speed dispersion stirred 15 minutes; Change the interior dispersion grinding of sand mill 45 minutes over to, the material fineness is reached below the 40 μ m; Change over to again in the paint still, under stirring at a slow speed, add the soap-free core-shell resin emulsion, continue to stir 10 minutes, regulate pH value to 8-9, add thickening material make material viscosity (being coated with 4 agar diffusion methods) reach 〉=35 seconds, promptly obtain a kind of aqueous metallic paint.

2, according to the aqueous metallic paint of claim 1, it is characterized in that used dispersion agent is a 2-amino-2-methyl-1-propanol, metal antirusting agent is the Sodium Nitrite dicyclohexyl amine, and membrane-forming agent is a 2-Butoxyethyl acetate, defoamer is the silicone oil defoamer, and thickening material is SN Thickener636.