paint flow and pigment dispersion pdf

Paint Flow And Pigment Dispersion Pdf

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US20100036045A1 - Aqueous pigment dispersions - Google Patents

The present invention relates to a method for producing a resin composition used for paint. More particularly, the present invention relates to a method for producing a resin composition used for paint which is preferable for improving dispersibility of pigments, thereby improving productivity. Conventionally, paint resin compositions usually include coloring materials such as particular inorganic pigments, organic pigments, or the like, depending on their application. In case of dispersing pigments in a resin composition used for paint, if the dispersibility of the pigments is not sufficient, a paint film obtained is not a good one, and various problems easily occur during coating processes.

Further, a deterioration of the quality of the film could be caused. Especially, in a case of an electrodeposition paint, low dispersibility of pigments easily cause a sedimentation of the pigments in the resin composition used for paint.

In order to suppress the sedimentation, an electrodeposition paint bath is provided with a stirrer to keep the electrodeposition paint flow. However, sedimentation of the pigments cannot be completely prevented. During electrodeposition, a part of the settled pigment is deposited on horizontal areas of a material being painted, and this leads to a degradation of an appearance of the paint film in these areas.

For example, in cases of a body of an automobile, an outdoor unit of an air conditioner, and the like, more pigments may be deposited on upper surface of horizontal surfaces than on other areas of a material being painted in a electrodeposition bath, and this causes problems in evenness, smoothness and sharpness of the paint film.

An approach to improve dispersibility of pigments in a resin composition used for paint includes changing a composition of the resin composition, such as changing a resin used in the dispersion, and the like. However, changing the composition of the resin composition used for paint itself requires a new confirmation over the long term of properties of the resin composition used for paint.

An object of the present invention is to provide a method for producing a resin composition used for paint which improves the dispersibility of pigments, thereby improving productivity and paint film properties of the resin composition for paint, without changing the composition thereof.

Namely, a first aspect of the present invention is a method for producing a resin composition used for paint, wherein plural pigments, which compose a resin composition used for paint, is dispersed at an optimal dispersion mixing ratio with resins and solvents, which has been found in advance using Daniel Flow Point Method, and then other components are added thereto to form the predetermined resin composition used for paint.

A second aspect of the present invention is a method for producing a resin composition used for paint wherein the resin composition used for paint is an electrodeposition paint composition. The present invention is characterized in that pigments which compose a resin composition used for paint are mixed, the pigment mixture is dispersed at an optimal dispersion mixing ratio with resins and solvents, which has been found in advance using a Daniel Flow Point Method also called Flow Point Method , and then other components are added thereto to obtain a predetermined resin composition used for paint.

In the present invention, the objective resin composition used for paint is not particularly limited and also can be preferably used in an electrodeposition paint composition. In general, a resin composition used for paint includes color pigments, extender pigments, anticorrosive pigments, and the like.

These pigments composing the resin composition used for paint are mixed, and the resulting pigment mixture is mixed with resins and solvents at an optimal dispersion mixing ratio, which has been obtained in advance using the Daniel Flow Point Method.

Patton, In this method, first, several types of mixed solutions hereinafter referred to as vehicle which contain the solvent and the resin in different ratios, are prepared. The same measurements are carried out similarly using other vehicles having different solvent to resin ratios. Using the results thus obtained, a flow point curve is drawn with amounts of the solid components of the resin in the vehicles on an abscissa and the amounts of the vehicles required to reach the flow points on an ordinate.

The flow point curve is U-shaped and has a minimum value. A composition at the minimum value is one in which the resin, the solvent and the pigment are well balanced and can be dispersed most efficiently.

Determining the above-described flow point requires some experience, but the outline thereof is as follows. When, as described above, the pigments in the beaker are kneaded while the vehicle is added thereto, the content of the beaker is paste-like at first, however, as more of the vehicle is added and mixed in, the drag that one stirring the content feels becomes very small. At this time, the glass rod is lifted straight above the beaker.

If the liquid adhering to the glass rod remains as a thin film, the last few drops of the liquid fall at intervals of 1 to 2 seconds, and the liquid has a sticky feel, this point is the flow point.

The Daniel Flow Point Method described in the above mentioned reference is a method for obtaining an optimal composition for a mill base using one type of pigment TiO 2 in the above reference.

It is also disclosed that when at least two types of pigments are included, the optimal composition can be determined by finding the amount of the vehicle when each pigment has reached its respective flow point, and proportionally adding these amounts of vehicle, in accordance with the ratio of the combined pigments.

However, the method for producing a resin composition used for paint of the present invention produces a resin composition used for paint which includes at least two types of pigments, wherein a mixture of two or more pigments is mixed with resins and solvents at an optimal dispersion mixing ratio which has been obtained in advance using the Daniel Flow Point Method. In the resin composition used for paint obtained by the production method of the present invention, a particle size of the pigments can be micrified to a predetermined value e.

Particularly, in case of electro-deposition, an appearance of horizontal aspects tends to be worse than that of vertical aspects. This is because a paint used in electrodeposition includes pigments which have a large specific gravities, while the electrodeposition paint uses water which has specific gravity of 1 as a solvent, and viscosity of the resin composition used for paint is nearly as low as water.

In an electrodeposition paint, which forms a film after or while a material to be coated is dipped in the electrodeposition paint, the paint is deposited under mild stirring conditions. Therefore, the pigments tend to accumulate on the horizontal aspects of the material to be coated such as a body of an automobile.

In general, when the pigments accumulate, so-called lump-like protrusions are easily formed at those portions, and the abnormal depositions are observed as so-called lumps after baking. Since dispersibility of the pigment can be improved in a short time in the method for producing a resin composition used for paint of the present invention, productivity of the resin composition used for paint on a production line can be improved, sedimentation speed of the pigments in the electrodeposition paint can be delayed, and formation of the above-described lumps can be prevented.

In this case, the pigments to be mixed include color pigments such as titanium white, carbon black and red oxide; and extender pigments such as kaolin, talc, calcium carbonate, clay and silica; anticorrosive pigments such as chrome pigments such as strontium chromate, zinc chromate , lead pigments such as basic lead silicate, basic lead chromate, red lead, lead cyanamide , phosphate pigments such as aluminum phosphate, zinc phosphate, calcium phosphate , molybdate pigments such as aluminum phosphomolybdate, zinc phosphomolybdate, and the like , borate pigments such as barium metaborate, and the like and cerium pigments such as cerium carbonate, cerium acetate, cerium pyrophosphate, and the like ; and mixtures of two or more of these pigments.

Examples of the resin for dispersing pigments which can be used for the electrodeposition paint include typical cationic electrodeposition paints such as sulfonium salt type epoxy resin, quaternary ammonium salt type epoxy resin, tertiary amine type epoxy resin, quaternary ammonium salt type acrylic resin, and the like. As the solvent, one or more solvents can be suitably selected depending on the type of the resin for dispersing pigments to be used.

Specifically, water is mainly used as the solvent, but water containing a small amount of an organic solvent such as butyl cellosolve, dipropylene glycol monobutylether, or the like, can also be used. As the surfactant or the wetting agent, alkyl imidazoline, acetylene alcohol, or the like, can be used. Further, a plasticizer may be added to the pigment paste. Examples of the plasticizer include high-boiling-point water-miscible materials such as nonylphenol, as well as ethylene oxide adduct and propylene oxide adduct of bisphenol A.

The other components here are those optionally selected depending on the application of the resin composition used for paint, and examples thereof in the case of the electrodeposition paint include the resin for dispersing pigments, the solvent, and the like. As a substrate resin, a hydrophilic film-forming resin having a cationic group can be used, which is derived from a bisphenol type epoxy resin, and has a number average molecular weight of to 10,, and preferably 1, to 3, A specific example thereof is an oxazolidone ring modified epoxy resin such as that which has been proposed by the applicant of the present invention and is disclosed in Japanese Patent Application Laid-Open JP-A No.

The oxazolidone ring modified epoxy resin is obtained by a dealcoholization reaction between an epoxy resin and either a bisurethane compound, which is formed by reacting a diisocyanate compound, or a heterourethane compound, which is formed by reacting another active hydrogen compound. As a curing agent, blocked polyisocyanate compounds are used.

The blocked isocyanate curing agent can be obtained by an addition reaction between a polyfunctional isocyanate compound and an isocyanate blocking agent. The polyfunctional isocyanate compounds to be used are an aliphatic, alicyclic or aromatic polyisocyanate.

As a curing catalyst, a tin compound such as dibutyltin oxide, dibutyltin dilaurate, or the like, can be used. The amount of the above-described block isocyanate curing agent to be added is preferably determined in terms of a ratio of the substrate resin and the curing agent. If the ratio of the curing agent is too small, it is impossible to obtain a sufficient curing property, and if it is too large, a baking weight loss would be increased.

A resin emulsion can be obtained by dispersing the substrate resin and the curing agent into an aqueous medium which contains as a neutralizer a water-soluble organic acid such as formic acid, acetic acid, propionic acid, lactic acid, citric acid, malic acid, tartaric acid, acrylic acid, or the like, or an inorganic acid such as hydrochloric acid, phosphoric acid, or the like. The cathode electrodeposition paint composition of the present invention can be coated on a surface of a desired substrate by cationic electrodeposition.

A film thickness of the electrodeposition coating which can be formed using the cathode electrodeposition paint composition of the present invention is not particularly limited. Hereinafter, examples of the present invention are described, however, these examples are not intended to limit the present invention.

A flask equipped with a stirrer, a cooler, a nitrogen injecting tube, a thermometer and a dropping funnel was prepared. After continuing the reaction for 30 minutes, 57 g of ethylene glycol monoethylhexylether was dropped from the dropping funnel, and 42 g of bisphenol A-propylene oxide 5 mole adduct was added.

Thereafter, 1. At this point, 32 g of methyl isobutyl ketone, 0. While the mixture was stirred and nitrogen was bubbled into the mixture, The reaction was continued until isocyanate groups disappeared, which was indicated by the IR spectrum, to obtain a blocked isocyanate cross linking agent.

Subsequently, the mixture was neutralized by adding glacial acetic acid so that the neutralization rate reached Then, methyl isobutyl ketone was removed under reduced pressure so that the amount of solid components became Into the flask, This invention is intended to provide a method for producing a resin composition used for paint which is preferable for improving dispersibility of pigments, thereby improving productivity.

The method is characterized in that a plurality of pigments which consist a resin composition used for paint is mixed, the mixed pigments are dispersed at an optimal dispersion mixing ratio with a resin and a solvent, which has been found in advance using a Daniel Flow Point Method a Flow Point Method , and then other components are added thereto to obtain the predetermined resin composition used for paint.

It is particularly preferable for the resin composition used for paint to be an electrodeposition paint composition.

Paint Flow and Pigment Dispersion

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Paint Flow And Pigment Dispersion A Rheological Approach To Coating And Ink Technology

If pigment dispersion stability is not appropriate, particles join again and form flocculates. It is important to know the initial degree of dispersion, its evolution during coating storage and the influence on its dry film anticorrosive properties. Variables studied were pigment dispersion time and coating ageing time in storage.

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Pigment dispersion degree and its evolution in storage

The present invention relates to a method for producing a resin composition used for paint. More particularly, the present invention relates to a method for producing a resin composition used for paint which is preferable for improving dispersibility of pigments, thereby improving productivity. Conventionally, paint resin compositions usually include coloring materials such as particular inorganic pigments, organic pigments, or the like, depending on their application. In case of dispersing pigments in a resin composition used for paint, if the dispersibility of the pigments is not sufficient, a paint film obtained is not a good one, and various problems easily occur during coating processes. Further, a deterioration of the quality of the film could be caused. Especially, in a case of an electrodeposition paint, low dispersibility of pigments easily cause a sedimentation of the pigments in the resin composition used for paint. In order to suppress the sedimentation, an electrodeposition paint bath is provided with a stirrer to keep the electrodeposition paint flow.

Goodreads helps you keep track of books you want to read. Want to Read saving…. Want to Read Currently Reading Read. Other editions.

Paint Flow and Pigment Dispersion: A Rheological Approach to Coating and Ink Technology
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2 Comments

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    10.04.2021 at 00:38 Reply
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