阅读说明：本技术 一种水性包覆型铝颜料的制备方法 (Preparation method of water-based coated aluminum pigment ) 是由 王恬 周加彦 刘丞 贺祥珂 邴欣 许超 于 2019-09-02 设计创作，主要内容包括：本发明涉及铝颜料加工领域,公开了一种水性包覆型铝颜料的制备方法,其特征在于：S1、将球形铝粉与适量的研磨助剂、适量超纯水混合并对其进行研磨,筛分、洗涤后进行烘干得到微米级的片状铝粉；S2、将上述片状铝粉添加至恒温加热的水性聚氨酯乳液中,同时不断对水性聚氨酯乳液进行搅拌使其逐渐包覆在片状铝粉上；S3、将外层包覆有水性聚氨酯层的片状铝粉进行过滤,静置后水洗、烘干,本方案在铝颜料的表面上包覆有一层稳定的水性聚氨酯层,可以有效保护铝颜料,提高其物理、化学性质,增加铝颜料在使用时的稳定性,同时,由于采用绿色环保的水性材料进行保护,减小生产过程中的挥发性物质产生,属于环境友好型材料。(The invention relates to the field of aluminum pigment processing, and discloses a preparation method of a water-based coated aluminum pigment, which is characterized by comprising the following steps of: s1, mixing the spherical aluminum powder with a proper amount of grinding aid and a proper amount of ultrapure water, grinding, screening, washing and drying to obtain micron-sized flaky aluminum powder; s2, adding the flaky aluminum powder into the constant-temperature heated aqueous polyurethane emulsion, and continuously stirring the aqueous polyurethane emulsion to gradually coat the flaky aluminum powder; s3, the flake aluminum powder that has the outer cladding waterborne polyurethane layer filters, the back washing of stewing, the stoving, this scheme cladding has the stable waterborne polyurethane layer of one deck on the surface of aluminum pigment, can effectively protect aluminum pigment, improve its physics, chemical property, increase the stability of aluminum pigment when the use, simultaneously, owing to adopt green' S aqueous material to protect, reduce the volatile substances production in the production process, belong to environment-friendly type material.)

1. A preparation method of a water-based coated aluminum pigment is characterized by comprising the following steps:

s1, mixing the spherical aluminum powder with a proper amount of grinding aid and a proper amount of ultrapure water, grinding, screening, washing and drying to obtain micron-sized flaky aluminum powder;

s2, adding the flaky aluminum powder into the constant-temperature heated aqueous polyurethane emulsion, and continuously stirring the aqueous polyurethane emulsion to gradually coat the flaky aluminum powder;

and S3, filtering the flaky aluminum powder coated with the waterborne polyurethane layer, standing, washing with water, and drying.

2. The method for preparing an aqueous coated aluminum pigment according to claim 1, wherein: the grinding aid is one or more of sodium borohydride, perfluorooctanoic acid, ethyl orthosilicate, white corundum powder, nano titanium dioxide and calcium carbonate.

3. The method for preparing an aqueous coated aluminum pigment according to claim 1, wherein: the grinding process adopts an ultra-fine ball mill, and other grinding devices can be adopted in the grinding process, which are not listed here, and the grinding process should not be a limitation of the present invention.

4. The method for preparing an aqueous coated aluminum pigment according to claim 1, wherein: the temperature of the constant-temperature heating process is 50-75 ℃.

5. The method for preparing an aqueous coated aluminum pigment according to claim 1, wherein the step S3 comprises:

s100, pouring the flaky aluminum powder coated in the step S2 onto a filter screen of 100-180 meshes;

s101, pressing down a filter screen to enable the materials to fall in an accelerated mode and contain the materials;

s102, standing for at least 3 hours, washing with ultrapure water, draining, and drying with a blower or a dryer.

Technical Field

The invention relates to the field of aluminum pigment processing, in particular to a preparation method of an aqueous coating type aluminum pigment.

Background

Aqueous polyurethanes are new polyurethane systems in which water is used as the dispersion medium instead of an organic solvent, and are also referred to as water-dispersed polyurethanes, aqueous polyurethanes, or water-based polyurethanes. The waterborne polyurethane takes water as a solvent, and has the advantages of no pollution, safety, reliability, excellent mechanical property, good compatibility, easy modification and the like. Aluminum pigment, commonly known as silver powder, is a silver metallic pigment, which is prepared by adding a small amount of lubricant into pure aluminum foil, crushing into scaly powder by ramming, and polishing. The aluminum powder has light weight, high floating force, strong covering power and good light and heat reflecting performance. After treatment, the aluminum powder can also be made into non-floating aluminum powder. The aluminum powder can be used for identifying fingerprints and can also be used as fireworks. Aluminum powder is a large class of metal pigments due to its wide use, large demand, and many varieties.

Due to the chemical characteristics of the aluminum powder, a layer of compact aluminum oxide film is formed on the surface of the aluminum powder, and the physical and chemical properties of the film are unstable, so that the application of the existing aluminum pigment has certain limitations.

How to solve the technical problems becomes a difficult problem to be solved urgently.

Disclosure of Invention

The invention aims to provide a preparation method of an aqueous coating type aluminum pigment, which aims to solve the problem that the application of the existing aluminum pigment has certain limitation due to unstable physical and chemical properties of a compact aluminum oxide film formed on the surface of aluminum powder due to the chemical characteristics of the aluminum powder.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a preparation method of a water-based coated aluminum pigment is characterized by comprising the following steps: s1, mixing the spherical aluminum powder with a proper amount of grinding aid and a proper amount of ultrapure water, grinding, screening, washing and drying to obtain micron-sized flaky aluminum powder; s2, adding the flaky aluminum powder into the constant-temperature heated aqueous polyurethane emulsion, and continuously stirring the aqueous polyurethane emulsion to gradually coat the flaky aluminum powder; and S3, filtering the flaky aluminum powder coated with the waterborne polyurethane layer, standing, washing with water, and drying.

Further, the grinding aid is one or more of sodium borohydride, perfluorooctanoic acid, ethyl orthosilicate, white corundum powder, nano titanium dioxide and calcium carbonate.

Further, the grinding process adopts an ultra-fine ball mill, and other grinding devices can be used in the grinding process, which are not listed here, and should not be a limitation of the present invention.

Further, the temperature in the constant-temperature heating process is 50-75 ℃.

Further, the step S3 includes: s100, pouring the flaky aluminum powder coated in the step S2 onto a filter screen of 100-180 meshes; s101, pressing down a filter screen to enable the materials to fall in an accelerated mode and contain the materials; s102, standing for at least 3 hours, washing with ultrapure water, draining, and drying with a blower or a dryer.

Compared with the prior art, the invention has the advantages that:

this scheme has the stable waterborne polyurethane layer of one deck in the cladding on the surface of aluminium pigment, can effectively protect aluminium pigment, improves its physics, chemical properties, increases the stability of aluminium pigment when using, simultaneously, owing to adopt green's waterborne material to protect, reduces the volatile substances production in the production process, belongs to environment-friendly type material.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a block diagram of the method of the present invention;

fig. 2 is a block diagram of a specific method of step S3 in the present invention.

Detailed Description

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and the scope of the present invention will be more clearly and clearly defined.

Referring to fig. 1, a method for preparing an aqueous coated aluminum pigment includes: s1, mixing the spherical aluminum powder with a proper amount of grinding aid and a proper amount of ultrapure water, grinding, screening, washing and drying to obtain micron-sized flaky aluminum powder; s2, adding the flaky aluminum powder into the constant-temperature heated aqueous polyurethane emulsion, and continuously stirring the aqueous polyurethane emulsion to gradually coat the flaky aluminum powder; and S3, filtering the flaky aluminum powder coated with the waterborne polyurethane layer, standing, washing with water, and drying.

This scheme has the stable waterborne polyurethane layer of one deck in the cladding on the surface of aluminium pigment, can effectively protect aluminium pigment, improves its physics, chemical properties, increases the stability of aluminium pigment when using, simultaneously, owing to adopt green's waterborne material to protect, reduces the volatile substances production in the production process, belongs to environment-friendly type material.

In this embodiment, the grinding aid is one or more of sodium borohydride, perfluorooctanoic acid, ethyl orthosilicate, white corundum powder, nano titanium dioxide and calcium carbonate, and preferably, the sodium borohydride, the perfluorooctanoic acid and the ethyl orthosilicate are mixed.

In this embodiment, the grinding process is performed by using an ultra-fine ball mill, and other grinding apparatuses may be used in this place, which are not listed here, and should not be a limitation to the present invention.

In the embodiment, the temperature in the constant-temperature heating process is 50-75 ℃.

In this embodiment, referring to fig. 2, the step S3 includes: s100, pouring the flaky aluminum powder coated in the step S2 onto a filter screen of 100-180 meshes; s101, pressing down a filter screen to enable the materials to fall in an accelerated mode and contain the materials; s102, standing for at least 3 hours, washing with ultrapure water, draining, and drying with a blower or a dryer.

The aluminum powder pigment of the embodiment has dense aluminum powder surface under the observation of a microscopeCoated with a film and having a luminescent spot with a specific surface area of 10.34cm²Aluminium powder can stably exist for 30 days in an acid solution with pH less than 1 without generating H₂。

This is the working principle of the preparation method of the aqueous coated aluminum pigment, and the contents not described in detail in this specification are the prior art well known to those skilled in the art.

Although the embodiments of the present invention have been described with reference to the accompanying drawings, various changes or modifications may be made by the patentees within the scope of the appended claims, and within the scope of the invention, as long as they do not exceed the scope of the invention described in the claims.