JPS58168639A - Pigment and production thereof - Google Patents

Abstract

PURPOSE:To form a pigment suitable for use as a component for a spray paint applied to tennis courts, running tracks, etc., by kneading rubber powder and fine colored inorg. oxide particles by using a mixing device constructed with an insulating material. CONSTITUTION:A mixing device comprising a mortar and a pestle made of porcelain is used. 80wt% rubber powder such as one having a particle size passing through #200 sieve obtd. by crushing used tire composed of styrene/butadiene rubber, and 20wt% fine colored inorg. oxide particles such as red iron oxide having an average particle size of 0.5mu, are placed in the mortar and kneaded with stirring at ordinary temp., while applying an appropriate force thereto by means of the pestle, to obtain a pigment in which the surface of the rubber powder is covered with the fine red iron oxide particle. The pigment can be easily mixed with and dispersed in an aq. synthetic resin emulsion. When spray coating is conducted by using the resulting paint, a coated surface which is elastic and soft to the touch, can be formed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pigment and a method for producing the same, in particular a pigment for a paint suitable for being applied or sprayed onto a surface that requires a certain degree of elasticity, and a method for producing the same. Colored hydrophilic inorganic oxide fine particles are attached in the form of a film to rubber powder particles, which are elastic and suitable as a pigment stem material for this type of paint, but are hydrophobic and difficult to disperse in water-based synthetic resin coatings. To make it possible to form a coated or sprayed surface that is homogeneous and has a certain degree of elasticity on the applied surface.

Generally, colored paint is applied to the surfaces of tennis courts, stadium tracks, and other outdoor steel or concrete structures for the purpose of adding color, but the paint film used for outdoor painting is Along with your own thinking, it is affected by dye lines, wind and rain, and other weather conditions, which not only impairs its strength and adhesion, but also tends to cause discoloration and fading of the painted surface, which impairs its aesthetic appearance and makes it difficult for the surrounding area. It also harms harmony with the environment.

Originally, inorganic pigments have the advantage of being superior to organic pigments in that they have better weather resistance and hardly cause discoloration or fading.However, on the other hand, they have inferior tinting power, so when used as a coloring agent in paints, they are often used in large amounts. In addition to being expensive, most inorganic pigments are fine particles and cannot be easily mixed and dispersed with a vehicle, making them prone to sedimentation and agglomeration when used as a paint. There is.

For this reason, although inorganic pigments are suitable as pigments for colored paints used outdoors in terms of weather resistance and color retention, coloring pigments using water-based synthetic resin emulsions as a vehicle are not suitable for use in paints. Problems remained to be resolved in terms of stability and cost.

In addition, when a paint containing a water-based synthetic resin emulsion as a vehicle is applied to metal, during the process of forming a paint film, water, which accounts for approximately 50% of the emulsion and water added during pigment mixing, evaporates, causing the metal surface to become watery. In contact with oxygen etc., the @genus 1. +X: Corrosion reactions that produce oxides, hydroxides, etc., are promoted and avoided. For this reason, when applying this unique paint to metals, especially iron, it is necessary to use a paint with high corrosion resistance, but a water-based synthetic resin emulsion paint that can meet these requirements has not yet been developed. Ta.

This inventor previously developed
Invented a pigment for paint, a method for producing the same, and an anticorrosive water-based emulsion paint, and filed a patent application for the invention (Japanese Patent Application No.
164508), however, this prior invention is
When applied to tennis courts, stadium tracks, etc., which require a certain degree of elasticity, it is difficult to obtain elasticity from the painted surface. Therefore, the present invention provides a paint pigment that can achieve the same object as the preceding invention, and that can impart a certain degree of elasticity to the intended application by purchasing it while diluting it, and a method for producing the same. do.

In other words, this application specifies a pigment consisting of rubber powder particles and colored inorganic oxide fine particles bonded together in a film-like manner. Using a mixing device, rubber powder and colored inorganic oxide particles are inserted into the mixing device, and the rubber powder particles are stirred and mixed while being pressed with an appropriate force at room temperature. A method for producing a pigment characterized by 1) depositing fine particles of the inorganic oxide described in 1) on the surface in the form of a film is defined as a combined invention.

The component constituting the paint pigment of the present invention consists of a combination of rubber powder particles and fine particles of an inorganic oxide adhered to the surface of the rubber powder particles in the form of a film. Examples of rubber powder particles include styrene-butadiene rubber (S, B
An old tire made of a polymeric material whose main component is old is crushed, and about 80 tires (weight ratio) of about 80 tires, which have passed through a Haboto 200 sieve (mesh 74 μm)'1, are used, for example. Since this type of rubber is a cross-linked polymer material created by adding mud, it is hydrophobic and not only difficult to disperse in aqueous synthetic resin emulsions, but also has poor adhesion to thermoplastic synthetic resins, and is used as a paint pigment. It is insufficient as a base material. Further, the fine particles of the inorganic oxide can be M'xt as appropriate depending on the type of object to be coated and the purpose of coating.

Next, a method for producing a paint material comprising a combination of the rubber powder particles and fine particles of an inorganic oxide will be described.

The mixing device for rubber powder particles and inorganic oxide fine particles is
Use a porcelain mortar and pestle.

In this process, it is necessary to press the rubber powder particles and the inorganic oxide fine particles with a certain amount of force and stir and mix them together.

This is also because both of these powders need to be electrically insulated. Therefore, other devices other than porcelain may be used as long as they have suitable volume and strength and are electrically non-conducting. The pestle may be operated manually or mechanically. As fine particles of inorganic oxide, about 20% (by weight) red iron oxide with an average particle size of 0.5 μm was placed in a mortar together with the rubber powder particles, and the mixture was crushed without applying an appropriate force with a pestle at room temperature. The powders are stirred (i4).Since both powders in the mortar are electrically insulated from the outside, the particles of the two powders, which are different substances, are mixed by +f forces due to mutual abrasion during pressurized mixing. , rubber powder particles mutual Hi
A dispersion effect occurs between the rubber powder particles and red iron fine particles due to electrostatic repulsion of the same kind of charge, but an attractive force due to electrostatic attraction of different types of charge acts between the rubber powder particles and the red iron red mirror particles. .

In general, the particles constituting a powder rarely exist as primary particles, but as secondary particles that combine with each other. The electrostatic repulsion that occurs between the particles acts as an effective dispersion effect so that both powders, which exist as secondary particles, become primary particles.

Incidentally, the surface of each particle of both powders is a rough surface with unevenness on a microscopic scale, and the contact area of red iron oxide fine particles adhering to the surface of the rubber powder particle is minute.

Therefore, the pressure force of macroscopic order applied by the pestle acts as a large force on this contact point, and the particles of both powders are pressed and secretly pressed together as the grain area at the contact point increases. A strong force, which is within the reach of the atomic attraction of the powder particles, acts between the particles.

If E (H) mixing with milk is continued, red iron particles will strongly adhere to the next surface of the rubber powder particles due to the above action, and the black rubber powder particles will become colored inorganic oxide particles. It is coated and hidden by a certain red iron, forming a pigment with the same hue as red iron.This is due to electrostatic repulsion due to similar charges between the red iron fine particles attached to the surface of the rubber powder particles and the red iron fine particles separated by 4 degrees that have not yet adhered. It can be assumed that this is occurring.

The above production method was applied to 1.1ν of inorganic oxide other than red red iron.
Particles of chromium oxide (green), titanium oxide (white),
When testing yellow iron oxide and iron black 2 ultramarine under the same conditions as red iron oxide, both were able to be deposited as a film on the surface of rubber powder particles, and the hue of the fine particles of each inorganic oxide was different. It was possible to obtain a conjugate having almost the same hue.

Moreover, it goes without saying that the hue can be precisely adjusted by suitably blending and mixing pigments of different hues made of inorganic oxides.

-J-, ljMy paint material is made by stirring and mixing rubber powder particles and inorganic oxide particles under appropriate pressure, but all 11" of inorganic oxide fine particles are mixed together. There is no need for the rubber powder particles to be combined with the inorganic oxide particles, and even if some free particles are included, there will be no problem in using them as paint pigments. It is not necessary to limit the compounding ratio to the above-mentioned important ratio.The particle size distribution of rubber powder particles, the average particle diameter and = "s
It is desirable to select an appropriate blending ratio depending on the average particle size and specific gravity of the inorganic oxide fine particles, while comparing the hue of the inorganic oxide fine particles and the hue of the combined body during the pressurized mixing process. The amount of paint spray described above shall be adjusted appropriately so as to obtain a hue that is almost the same as that of the oxide particles.Since the above paint spray is in the form of coarse particles, it is difficult to mix it with the oil-containing water-based synthetic resin emulsion. Because it is easy to disperse and the critical pigment volume concentration (C, I), V, 0) can be large, it is not only extremely suitable as a pigment for aqueous synthetic 8K heather emulsion paints, but also as a pigment for emulsion paints. You can save money on convenience.

In the paint preparation thus obtained, similar particles of the inorganic oxide do not separate from the rubber powder particles even when boiled in boiling water for a long time. Therefore, it is suitable as a pigment for emulsion spray coating materials.

In particular, according to the inventor's experiments, when used for spraying the second surface of concrete pavement used for tennis courts, a court surface with a soft feel that takes advantage of the elasticity of rubber can be finished at a low cost.

4 Additional relations The specified invention of this application uses rubber powder particles instead of the rock powder particles of the specified invention of the original application for the powder particles that are the base material of the suppressant, so that it can be applied to painted surfaces as a pigment-based paint. The point that elasticity can be imparted to the paper when applied is added as utilizing the main part of the specific research of the original application, and the combined invention of this application is: The use of rubber powder particles in place of the rock powder particles used in the first combined invention of the original application is material substitution in the method of the first combined invention, and imparts elasticity to the painted surface. This has been added as a method that can produce pigments for paints.

Claims (2)

[Claims] (1) A pigment consisting of rubber powder particles and colored inorganic oxide fine particles bonded to the surface thereof in a film form. (2) Using a mixing device made of electrically nonconducting material, insert rubber powder and colored inorganic oxide fine particles into the mixing device, and stir and mix while pressing with appropriate force at room temperature. A method for producing a pigment, characterized in that fine particles of the inorganic oxide are adhered to the surface of the rubber powder particles in the form of a film.