CN113583473B - Nano coated organic pigment and preparation method thereof - Google Patents

Abstract

The invention provides a nano-coating organic pigment, which is prepared from azo organic pigment, amorphous aluminum silicate, nano titanium dioxide, a coupling agent, a solvent and a dispersing agent. The invention has the advantages that the composite pigment avoids the respective defects of inorganic pigment and organic pigment, and accordingly inherits the advantages of each other to meet the severe requirements of high-end in the aspects of printing ink, functional coating and the like, and has good dispersibility and wettability, and is easy to disperse in an acrylic plate; the composite pigment formed by coating the inorganic pigment with the organic pigment is applied to an acrylic plate, and the shear strength, the impact strength and the weather resistance are in accordance with the test standard and even the impact strength is effectively improved through three data characterization of the test mechanical property (including shear and impact) and weather resistance test.

Description

Nano-encapsulated organic pigment and preparation method thereof

technical field

The invention relates to the technical field of organic pigments, in particular to nano-encapsulated organic pigments and a preparation method thereof.

Background technique

Inorganic pigments and organic pigments belong to two categories of pigments. Among them, inorganic pigments have good weather resistance and superior physical properties, but due to shortcomings such as incomplete chromatography and heavy metal toxicity, they cannot be mass-produced. Compared with inorganic pigments, organic pigments have the advantages of bright color, good transparency, complete variety, and good chemical stability. However, due to the influence of production equipment and process technology, the price of organic pigments is generally high, and the stability of comprehensive performance is poor, including solvent resistance, weather resistance, heat resistance and other aspects.

Azo and phthalocyanines account for a large proportion in the organic pigment market. Some studies have shown that part of the inner core of the pigment is not expressed in coloring, and the color of the surface of the pigment particle is only caused by the reflected light on the surface.

Because the color and light of inorganic pigments are dim and the types are single, but the mechanical properties of organic pigments are insufficient, which has greatly restricted the application of both inorganic pigments and organic pigments in the fields of high precision, high facilities, and outdoor construction industries. The advantages of organic pigments and inorganic pigments are combined to prepare a new composite pigment, which avoids the respective shortcomings of inorganic pigments and organic pigments, and inherits the mutual advantages to meet the high-end requirements of inks, functional coatings, etc. demanding. The method of compounding inorganic pigments and organic pigments is to modify the pigments. Currently applied technologies include core-shell encapsulation method, polymer coating method, inorganic hybridization technology, pigment surface treatment technology, etc.

Some people use the nano-calcium carbonate slurry to be added to the chemical reaction vessel, and the organic pigment is added to the stirring and grinding vessel, and the silica modified by the anionic modifier is used as the adsorption carrier, and the organic pigment is obtained by high-temperature calcination/ Silica/nano calcium carbonate composite pigment. The composite pigment produced by this method saves cost while keeping the tinting strength unchanged, has uniform particle size distribution, weather resistance, heat resistance, and good mechanical properties.

However, due to the complex technological process of ternary composite pigments, cumbersome operations, and high requirements for composite time and precision, the difference in raw material ratios can easily lead to uneven dispersion and agglomeration.

Contents of the invention

Aiming at the deficiencies of the prior art, the invention provides a nano-coated organic pigment and a preparation method thereof.

The present invention realizes solving above-mentioned technical problem by following technical means:

Nano-coated organic pigments are prepared from azo-based organic pigments, amorphous aluminum silicate, nano-titanium dioxide, coupling agents, solvents and dispersants.

Preferably, the components of the composite pigment and their mass percentage contents are: 40-80% of azo-based organic pigments, 10-40% of amorphous aluminum silicate, and 10-30% of titanium dioxide.

Preferably, the coupling agent is 2-10% of the mass of the composite pigment.

Preferably, the mass ratio of the solvent to the composite pigment is 2-8:1.

Preferably, the dispersant is used in an amount of 2-10% of the mass of the composite pigment.

Preferably, the coupling agent is one or more of silane, methacrylic acid ethylene glycol, and aluminate.

Preferably, the solvent is one or more of polyurethane methacrylate, dioctyl terephthalate, and butyl phthalate.

Preferably, after mixing the azo organic pigment, coupling agent and nano-titanium dioxide in a certain proportion and centrifuging and shaking evenly, then adding amorphous aluminum silicate and continuing to stir and mix evenly, then adding a certain proportion of solvent and dispersant and stirring Go into the ball mill and wet ball mill to get the product.

Preferably, the centrifugation time is 0.5-2h, the stirring time is 0.5-2h, and the rotation speed of the agitator is 300-800r/min.

Preferably, the ball size used in the wet ball mill is 1mm, and the ball milling time is 6-24h.

The advantages of the present invention are: the composite pigment avoids the respective shortcomings of inorganic pigments and organic pigments, and accordingly inherits the mutual advantages to meet the stringent requirements of high-end printing inks, functional coatings, etc., the dispersibility and Good wettability, easy to disperse in the acrylic plate; the composite pigment made of organic pigment coated with inorganic pigment is applied in the acrylic plate, and is characterized by three data of testing mechanical properties (including shear and impact) and weather resistance test Look, the shear strength, impact strength, and weather resistance meet the test standards, and even the impact strength has been effectively improved.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are part of the present invention Examples, not all examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Implementation Case 1

Add 1kg of azo-based organic pigments, 50g of coupling agent and 300g of nano-titanium dioxide into a centrifugal vibrator and vibrate evenly for 1 hour, then put them into a stirring container and then add 200g of amorphous aluminum silicate and 4kg of butyl phthalate Stir as a solvent and 50 g of propylene glycol methyl ether as a dispersant and put it into a ball mill for wet ball milling for 10 hours to obtain the target product.

Embodiment 2

Add 1kg of azo-based organic pigments, 30g of coupling agent and 300g of nano-titanium dioxide into a centrifugal vibrator and vibrate for 0.5h evenly, then take them into a stirring container and then add 100g of amorphous aluminum silicate and 4kg of butyl phthalate The ester was used as a solvent and 40 g of propylene glycol methyl ether was used as a dispersant, stirred and put into a ball mill for wet ball milling for 8 hours to obtain the target product 2.

Embodiment 3

Add 800g of azo-based organic pigments, 60g of coupling agent and 500g of nano-titanium dioxide into a centrifugal vibrator and vibrate for 1.2 hours evenly, and then add 150g of amorphous aluminum silicate and 5kg of butyl phthalate into a stirring container The ester was used as a solvent and 30 g of propylene glycol methyl ether was used as a dispersant, stirred and put into a ball mill for wet ball milling for 8 hours to obtain the target product.

Embodiment 4

Add 1kg of azo-based organic pigments, 40g of coupling agent and 500g of nano-titanium dioxide into a centrifugal vibrator and vibrate for 2 hours evenly, then put them into a stirring container and then add 200g of amorphous aluminum silicate and 5kg of butyl phthalate Stir as a solvent and 40 g of propylene glycol methyl ether as a dispersant and put it into a ball mill for wet ball milling for 6 hours to obtain the target product.

The composite pigment pastes of the above-mentioned embodiments 1-4 were added into PMMA plexiglass plates with an addition amount of 1%, and their shear strength, strength and weather resistance were tested.

Test result comparison table:

Composite pigments contain aluminum silicate with high strength compounds. The disadvantages of inorganic pigments that are difficult to overcome are poor transparency, not wide color spectrum, not bright shade, relatively low tinting strength, and many heavy metal inorganic pigments are poisonous. The organic pigments have complete color spectrum, bright color, strong tinting power and controllable preparation. The advantages of organic pigments and inorganic pigments are combined to prepare new composite pigments. The composite pigments avoid the respective shortcomings of inorganic pigments and organic pigments, and correspondingly Inheriting mutual advantages to meet the stringent requirements of high-end inks, functional coatings, etc., the composite pigment has good dispersibility and wettability, and is easy to disperse in the acrylic plate.

Composite pigments made of organic pigments coated with inorganic pigments are applied to acrylic boards. From the three data characterizations of mechanical properties (including shear and impact) and weather resistance tests, the shear strength, impact strength, and weather resistance meet the requirements of Test standards and even impact strength have been effectively improved.

The composite pigment with organic pigment as the shell and inorganic nano-titanium dioxide/aluminum silicate as the core is mainly the saturated color displayed by the surface color of the organic pigment. The surface is uniformly dispersed and adsorbed, avoiding the agglomeration of nano-titanium dioxide and improving its weather resistance stability and mechanical physical properties. The specific surface area of the modified nano-titanium dioxide/amorphous aluminum silicate is greatly increased, so that azo organic pigments On this basis, it can have a good coating effect.

The azo pigments in this article are not limited to a certain type or color of organic pigments, but are limited by the tinting power, hiding power and oil absorption in different color systems even if many organic pigments are azo pigments. Indexes are not the same, resulting in color confusion and dull color when the alternative azo-based organic pigments cannot match the nano-titanium dioxide/aluminum silicate. There is also a certain phthalocyanine pigment that has a better interface compatibility with the above-mentioned inorganic composite materials, and the displayed color is more vivid and bright, and the mechanical properties of the acrylic sheet may be better improved.

It should be noted that in this article, if there are relational terms such as first and second, etc., they are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that these entities or operations Any such actual relationship or order exists between. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be described in the foregoing embodiments Modifications are made to the recorded technical solutions, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (3)

1. Nano-coated organic pigments, characterized in that: they are prepared from composite pigments, coupling agents, solvents and dispersants; The components and mass percentages of the composite pigments are: 40-80% of azo-based organic pigments, 10-40% of amorphous aluminum silicate, and 10-30% of titanium dioxide; The coupling agent is 2-10% of the composite pigment quality; The mass ratio of the solvent to the composite pigment is 2-8:1; The consumption of described dispersant is 2-10% of composite pigment quality; The nano-encapsulated organic pigment is obtained by the following preparation method. After the azo-based organic pigment, coupling agent and nano-titanium dioxide are mixed in a certain proportion and evenly shaken by centrifugation, then add amorphous aluminum silicate and continue to stir and mix evenly. Add a certain proportion of solvent and dispersant, stir and put it into a ball mill for wet ball milling to obtain the product; The coupling agent is one or more of silane, methacrylic acid ethylene glycol, and aluminate; The solvent is one or more of polyurethane methacrylate, dioctyl terephthalate, and butyl phthalate. 2. The nano-encapsulated organic pigment according to claim 1, characterized in that: the centrifugation time is 0.5-2h, the stirring time is 0.5-2h, and the rotation speed of the mixer is 300-800r/min. 3. The nano-encapsulated organic pigment according to claim 1, characterized in that: the diameter of the balls used in the ball mill is 1mm, and the ball milling time is 6-24h.