CN107177229B - Aqueous wax dispersion and preparation method thereof - Google Patents
Aqueous wax dispersion and preparation method thereof Download PDFInfo
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- CN107177229B CN107177229B CN201710272038.8A CN201710272038A CN107177229B CN 107177229 B CN107177229 B CN 107177229B CN 201710272038 A CN201710272038 A CN 201710272038A CN 107177229 B CN107177229 B CN 107177229B
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Abstract
The invention relates to the technical field of wax dispersoid, in particular to an aqueous wax dispersoid and a preparation method thereof, wherein the aqueous wax dispersoid is prepared from the following raw materials in parts by weight: 20-60 parts of wax, 1-5 parts of nucleating agent, 0.5-5.0 parts of suspending agent and 50-100 parts of deionized water. The water-based wax dispersion has zero VOC emission, simple application and good uniform particle size distribution effect, does not contain surfactants such as emulsifier and the like, greatly improves the water resistance of a paint film, and solves the problem of paint film defects such as water resistance of the paint film caused by the water-based wax dispersion.
Description
Technical Field
The invention relates to the technical field of wax dispersoid, in particular to an aqueous wax dispersoid and a preparation method thereof.
Background
In the paint and coating industry, natural and synthetic wax additives play an important role in the performance quality of the product, contributing to the surface properties of the final coated product, improved coating integrity and surface appearance, as well as facilitating downstream processing of the coated products and extending their service life. Although constituting only a small part of the formulation, the additives can achieve significant improvements in the performance of the overall formulation at low dosages and costs, thereby providing enhanced product performance and value. As the performance requirements for surface modifiers continue to increase, end users in these industries also continue to desire lower costs, which results in thinner coating films and faster line speeds. In addition, with the development of the forty billion dollar global additive industry, there is an increasing need for aqueous additive dispersions that are free of environmentally harmful substances, have zero or low Volatile Organic Compound (VOC) content, and are free of antifoaming and antifoaming agents. Among the many additives available today, natural and synthetic waxes are able to meet such needs in these industries, imparting improved surface modification properties to paints and coatings in the form of environmentally friendly aqueous wax dispersions. As shown in figure 1, most of the wax dispersions prepared at present adopt a wax dispersion which is formed by emulsifying and stabilizing wax by a surfactant such as an emulsifier on the outside, and a large amount of the wax dispersion is introduced, so that the water resistance of a paint film is poor, even a few surfactants migrate to the surface of the paint film to cause partial paint film fouling on the surface of the paint film, and for the phenomenon, only a series of products such as W-400 and the like are available on the market from Mitsui corporation of Japan, but no technology or patent is disclosed.
Disclosure of Invention
In order to overcome the defects and shortcomings in the prior art, the invention aims to provide the aqueous wax dispersion which has zero VOC emission, simple application and good uniform particle size distribution effect, does not contain surfactants such as an emulsifier and the like, and greatly improves the water resistance of a paint film.
The invention also aims to provide a preparation method of the aqueous wax dispersoid, which has the advantages of simple steps, convenient operation and control, stable quality, high production efficiency and low production cost and can achieve large-scale industrial production.
The purpose of the invention is realized by the following technical scheme: an aqueous wax dispersion is composed of the following raw materials in parts by weight:
preferably, the feed consists of the following raw materials in parts by weight:
preferably, the feed consists of the following raw materials in parts by weight:
preferably, the wax is a polyethylene wax and/or an oxidized polyethylene wax. More preferably, the wax is prepared from polyethylene wax and oxidized polyethylene wax in a weight ratio of 1-2: 1, in a mixture of the components. By adopting the wax, the VOC emission of the prepared aqueous wax dispersoid is zero, the application is simple, and the particle size distribution is uniform and the effect is good.
Preferably, the polyethylene wax is a polyethylene wax having a melting point of 110-140 ℃. The invention adopts the polyethylene wax with the melting point of 110-140 ℃, so that the prepared aqueous wax dispersoid has zero VOC emission, simple application and good uniform particle size distribution effect.
Preferably, the oxidized polyethylene wax is a high-density oxidized polyethylene wax with a melting point of 130-146 ℃. The invention adopts the high-density oxidized polyethylene wax with the melting point of 130-146 ℃, so that the prepared aqueous wax dispersoid VOC emission is zero, the application is simple, and the particle size distribution is uniform and has good effect.
Preferably, the nucleating agent is at least one of sodium benzoate, talc, sodium bis (2, 4-di-tert-butylphenyl) phosphate, sodium 2, 2' -methylene-bis (4, 6-di-n-butylphenol) phosphate, aluminum methylene-bis (2, 4-di-tert-butylphenyl) phosphate, and pinacrystal KM-1300 and KM-1500 of wasteland japan. More preferably, the nucleating agent is a mixture of sodium bis (2, 4-di-tert-butylphenyl) phosphate, sodium 2, 2' -methylene-bis (4, 6-di-n-butylphenol) phosphate and aluminum methylene bis (2, 4-di-tert-butylphenyl) phosphate in a weight ratio of 2-4:1.5-2.5: 1. By adopting the nucleating agent, the nucleating effect is good, the VOC emission of the prepared aqueous wax dispersoid is zero, the application is simple, and the particle size distribution is uniform and good.
Preferably, the suspending agent is Pico chemical RDX and/or cellulose acetate CAB 551. More preferably, the suspending agent is a mixture of Pico chemical RDX and cellulose acetate CAB551 in a weight ratio of 1.5-2.5: 1. By adopting the suspending agent, the suspending effect is good, the VOC emission of the prepared aqueous wax dispersoid is zero, the application is simple, and the particle size distribution is uniform and good.
A preparation method of an aqueous wax dispersoid comprises the steps of heating wax, a nucleating agent and deionized water in a reaction kettle to 155-165 ℃, carrying out high-strength shearing dispersion on the wax, the nucleating agent and the deionized water into ultrafine particles through a high-shear emulsifying machine, wherein the shearing speed is 2200-2800RPM, cooling to 125-135 ℃, forming the wax solid dispersoid of a water dispersion phase, cooling to 80-100 ℃, filtering, adding a suspending agent, and uniformly and stably dispersing to obtain the aqueous wax dispersoid.
The invention has the beneficial effects that: the water-based wax dispersion has zero VOC emission, simple application and good uniform particle size distribution effect, does not contain surfactants such as emulsifier and the like, greatly improves the water resistance of a paint film, and solves the problem of paint film defects such as water resistance of the paint film caused by the water-based wax dispersion.
The preparation method has the advantages of simple steps, convenient operation and control, stable quality, high production efficiency and low production cost, and can achieve large-scale industrial production.
Drawings
FIG. 1 is a schematic of the structure of a prior art wax dispersion;
FIG. 2 is a schematic of the structure of an aqueous wax dispersion of the present invention;
the reference signs are: 10-wax monomer, 1-surfactant and 2-nucleating agent.
Detailed Description
For the understanding of those skilled in the art, the present invention will be further described with reference to the following examples and accompanying fig. 1-2, which are not intended to limit the present invention.
Example 1
An aqueous wax dispersion is composed of the following raw materials in parts by weight:
the wax is prepared from polyethylene wax and oxidized polyethylene wax in a weight ratio of 1: 1, in a mixture of the components.
The polyethylene wax is a polyethylene wax with a melting point of 110 ℃.
The oxidized polyethylene wax is high-density oxidized polyethylene wax with the melting point of 130 ℃.
The nucleating agent is sodium benzoate or talcum powder.
The suspending agent is a mixture of Picco chemical RDX and cellulose acetate CAB551 in a weight ratio of 1.5: 1.
A preparation method of an aqueous wax dispersoid comprises the steps of heating wax, a nucleating agent and deionized water in a reaction kettle to 155 ℃, carrying out high-strength shearing and dispersion on the wax, the nucleating agent and the deionized water into ultrafine particles through a high-shear emulsifying machine, cooling to 125 ℃ at a shearing rotating speed of 2200RPM, forming into the wax solid dispersoid of a water dispersion phase, cooling to 80 ℃ again, filtering, adding a suspending agent, and uniformly and stably dispersing to obtain the aqueous wax dispersoid.
Example 2
An aqueous wax dispersion is composed of the following raw materials in parts by weight:
the wax is polyethylene wax.
The polyethylene wax is a polyethylene wax with a melting point of 125 ℃.
The nucleating agent is Pinecrystal KM-1300 or KM-1500 of wasteland Japan.
The suspending agent is cellulose acetate CAB 551.
A preparation method of an aqueous wax dispersoid comprises the steps of heating wax, a nucleating agent and deionized water in a reaction kettle to 158 ℃, carrying out high-strength shearing and dispersion on the wax, the nucleating agent and the deionized water into ultrafine particles through a high-shear emulsifying machine, cooling to 128 ℃ at the shearing speed of 2400RPM, forming into the wax solid dispersoid of an aqueous dispersion phase, cooling to 85 ℃ again, filtering, adding a suspending agent, and uniformly and stably dispersing to obtain the aqueous wax dispersoid.
Example 3
An aqueous wax dispersion is composed of the following raw materials in parts by weight:
the wax is oxidized polyethylene wax.
The oxidized polyethylene wax is oxidized polyethylene wax OA6 with the melting point of 138 ℃.
The nucleating agent is bis (2, 4-di-tert-butylphenyl) sodium phosphate, 2' -methylene-bis (4, 6-di-n-butylphenol) sodium phosphate or methylenebis (2, 4-di-tert-butylphenyl) aluminum phosphate.
The suspending agent is Pico chemical company RDX.
A preparation method of an aqueous wax dispersoid comprises the steps of heating wax, a nucleating agent and deionized water in a reaction kettle to 160 ℃, carrying out high-strength shearing and dispersion on the wax, the nucleating agent and the deionized water into ultrafine particles through a high-shear emulsifying machine, cooling to 130 ℃ at the shearing rotating speed of 2500RPM, forming into the wax solid dispersoid of an aqueous dispersion phase, cooling to 90 ℃ again, filtering, adding a suspending agent, and uniformly and stably dispersing to obtain the aqueous wax dispersoid.
Example 4
An aqueous wax dispersion is composed of the following raw materials in parts by weight:
the wax is prepared from polyethylene wax and oxidized polyethylene wax in a weight ratio of 1.5:1, in a mixture of the components.
The polyethylene wax is a polyethylene wax with a melting point of 125 ℃.
The oxidized polyethylene wax is high-density oxidized polyethylene wax with the melting point of 138 ℃.
The nucleating agent is a mixture of sodium bis (2, 4-di-tert-butylphenyl) phosphate, sodium 2, 2' -methylene-bis (4, 6-di-n-butylphenol) phosphate and aluminum methylenebis (2, 4-di-tert-butylphenyl) phosphate in a weight ratio of 2:1.5: 1.
The suspending agent is a mixture of Picco chemical RDX and cellulose acetate CAB551 in a weight ratio of 2:1.
A preparation method of an aqueous wax dispersion comprises the steps of heating wax, a nucleating agent and deionized water in a reaction kettle to 162 ℃, carrying out high-strength shearing dispersion on the wax, the nucleating agent and the deionized water through a high-shear emulsifying machine to form extremely fine particles, cooling to 132 ℃ at the shearing speed of 2600RPM, forming the wax solid dispersion as an aqueous dispersion phase, cooling to 95 ℃ again, filtering, adding a suspending agent, and uniformly and stably dispersing to obtain the aqueous wax dispersion.
Example 5
An aqueous wax dispersion is composed of the following raw materials in parts by weight:
the wax is prepared from polyethylene wax and oxidized polyethylene wax in a weight ratio of 2:1, in a mixture of the components.
The polyethylene wax is a polyethylene wax with a melting point of 140 ℃.
The oxidized polyethylene wax is high-density oxidized polyethylene wax with the melting point of 146 ℃.
The nucleating agent is a mixture consisting of sodium bis (2, 4-di-tert-butylphenyl) phosphate, sodium 2, 2' -methylene-bis (4, 6-di-n-butylphenol) phosphate and aluminum methylenebis (2, 4-di-tert-butylphenyl) phosphate in a weight ratio of 4:2.5: 1.
The suspending agent is a mixture of Picco chemical RDX and cellulose acetate CAB551 in a weight ratio of 2.5: 1.
A preparation method of an aqueous wax dispersoid comprises the steps of heating wax, a nucleating agent and deionized water in a reaction kettle to 165 ℃, carrying out high-strength shearing and dispersion on the wax, the nucleating agent and the deionized water into ultrafine particles through a high-shear emulsifying machine, cooling to 135 ℃ at the shearing speed of 2800RPM, forming into the wax solid dispersoid of a water dispersion phase, cooling to 100 ℃ again, filtering, adding a suspending agent, and uniformly and stably dispersing to obtain the aqueous wax dispersoid.
As shown in figure 2, the VOC emission of the aqueous wax dispersion is zero, the application is simple, the particle size distribution is uniform, the effect is good, and the water resistance of a paint film is greatly improved because the aqueous wax dispersion does not contain surfactants such as an emulsifier and the like.
The above-described embodiments are preferred implementations of the present invention, and the present invention may be implemented in other ways without departing from the spirit of the present invention.
Claims (1)
1. A method of preparing an aqueous wax dispersion, characterized by: the aqueous wax dispersion comprises the following raw materials in parts by weight:
the wax is prepared from polyethylene wax and oxidized polyethylene wax in a weight ratio of 1-2: 1;
the polyethylene wax has a melting point of 110-140 ℃;
the oxidized polyethylene wax is high-density oxidized polyethylene wax with the melting point of 130-146 ℃;
the nucleating agent is a mixture consisting of sodium bis (2, 4-di-tert-butylphenyl) phosphate, sodium 2, 2' -methylene-bis (4, 6-di-n-butylphenol) phosphate and aluminum methylenebis (2, 4-di-tert-butylphenyl) phosphate in a weight ratio of 2-4:1.5-2.5: 1;
the suspending agent is a mixture of Bick chemical company RDX and cellulose acetate CAB551 in a weight ratio of 1.5-2.5: 1;
the preparation method of the aqueous wax dispersion comprises the following steps: heating wax, nucleating agent and deionized water in a reaction kettle to 155-165 ℃, carrying out high-strength shearing dispersion on the wax, the nucleating agent and the deionized water into superfine particles by a high-shear emulsifying machine under the action of the nucleating agent, cooling to 125-135 ℃ at the shearing rotating speed of 2200-2800RPM, shaping into a wax solid dispersion with a water dispersion phase, cooling to 80-100 ℃ again, filtering, adding a suspending agent, and uniformly and stably dispersing to obtain the aqueous wax dispersion.
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4330342A1 (en) * | 1993-09-08 | 1995-03-09 | Basf Ag | Stable aqueous polyolefin wax dispersions |
| DE602004017124D1 (en) * | 2003-01-08 | 2008-11-27 | Johnson & Johnson Gmbh | AN APPLICATOR AND PRODUCTS CONTAINING A WAX DISPERSION |
| US8853284B2 (en) * | 2008-06-02 | 2014-10-07 | Honeywell International Inc. | Wax dispersion formulations, method of producing same, and uses |
| EP2935433B1 (en) * | 2012-12-21 | 2019-09-18 | Milliken & Company | Additive composition and process for using the same |
| CN103467829B (en) * | 2013-09-25 | 2015-10-28 | 南京天诗新材料科技有限公司 | Wax aqueous dispersion of loaded with nano silicon-dioxide and its production and use |
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