An acrylic emulsion and a method for preparing the same

Abstract

The application discloses an acrylic emulsion, and steps are as follows: adding deionized water, polyvinylpyrrolidone and sodium stearate into a reaction kettle under normal temperature, heating, stirring and dissolving, stopping heating after complete dissolution, and obtaining component A; stirring, mixing, heating and obtaining component B by mixing polyethylene glycol, water-based acrylic resin, a dispersing agent and an emulsifier under normal temperature; stirring and mixing water-based color paste, bisphenol A and sodium dodecyl sulfonate under normal temperature, and obtaining component C; stirring and mixing component A, component B and a defoaming agent under normal temperature, heating, cooling again, adding glycerol, cooling, adding essence and component C while stirring, uniformly stirring and mixing, continuously cooling, and obtaining the acrylic emulsion. The obtained acrylic emulsion is environment-friendly, harmless, does not affect children's health, not easy to age, and convenient to clean.

Description

An acrylic emulsion and its preparation method Technical Field

[0001] This invention belongs to the field of child-safe coating technology, specifically relating to an acrylic emulsion and its preparation method. Background Technology

[0002] Water-based paint pens, as a common type of drawing tool, are loved by children for their vibrant colors, diverse hues, and ease of use. Many parents also consider them an important tool for children's intellectual development, resulting in a large market potential. The brilliant colors of water-based paint pens primarily come from dyes, which contain certain amounts of soluble heavy metals such as lead, barium, chromium, antimony, cadmium, mercury, and arsenic. Most importantly, the dyes used in the vast majority of existing paint pens contain seriously excessive levels of carcinogenic substances such as aromatic hydrocarbons. During use, these heavy metals and carcinogens can enter the body unknowingly through direct skin contact and the digestive system, causing harm. Currently, most non-industrial paints on the domestic market are generally divided into liquid and solid forms. Liquid paint, poured directly into an art palette and applied with a brush, can easily spill onto the floor or artwork, especially for young children whose self-control is still developing, often resulting in a mess. Solid paint, such as crayons, is commonly found in the market. Most crayons are packaged in paper, with only a thin layer of paper covering the lead, and some are even "naked," posing a significant potential danger to users. Paper packaging is easily damaged, and once the lead comes into direct contact with the skin, residue can easily remain on the skin. It's also impractical to expect children to wash their hands thoroughly after each use. Furthermore, some manufacturers add excessive amounts of lead salt additives or use inferior, cheap lead salt additives during the production process to make the crayons more vibrant and appealing, resulting in lead content exceeding the legal limit. It is well known that excessive lead intake can damage the blood, nervous, digestive, and reproductive systems, particularly severely impacting the growth and intellectual development of children and adolescents. Furthermore, in terms of usability, crayons are oil-based, have relatively poor compatibility, are difficult to apply, and are prone to uneven application, failing to achieve the desired effect and greatly reducing children's interest in drawing.

[0003] Therefore, it is necessary to develop an acrylic emulsion to solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to provide an acrylic emulsion and its preparation method to solve the above-mentioned problems.

[0005] One technical solution of the present invention is to provide an acrylic emulsion, which, by weight percentage, comprises 8-10% polyvinylpyrrolidone, 3-5% sodium stearate, 4-6% polyethylene glycol, 9-15% waterborne acrylic resin, 1-3% dispersant, 1-3% emulsifier, 1-3% waterborne color paste, 0.1-1.5% bisphenol A, 0.1-0.4% sodium dodecyl sulfonate, 6-9% glycerin, 0.04-0.06% fragrance, 0.1-0.4% defoamer, and the balance being deionized water.

[0006] Furthermore, by weight percentage, it includes 9% polyvinylpyrrolidone, 4% sodium stearate, 5% polyethylene glycol, 12% waterborne acrylic resin, 2% dispersant, 2% emulsifier, 2% waterborne color paste, 1% bisphenol A, 0.3% sodium dodecyl sulfonate, 7% glycerin, 0.05% fragrance, 0.3% defoamer, and the balance being deionized water.

[0007] Another technical solution of the present invention is:

[0008] A method for preparing an acrylic emulsion is provided, comprising the following steps:

[0009] (1) At room temperature, add deionized water, polyvinylpyrrolidone and sodium stearate to the reaction vessel, heat to 80~90℃, stir to dissolve, and stop heating after complete dissolution to obtain component A;

[0010] (2) At room temperature, polyethylene glycol, waterborne acrylic resin, dispersant and emulsifier are stirred and mixed for 10-20 minutes, heated to 60-70℃ and kept for 60-70 minutes to obtain component B;

[0011] (3) At room temperature, water-based pigment, bisphenol A and sodium dodecyl sulfonate are stirred and mixed to obtain component C;

[0012] (4) At room temperature, mix and stir components A, B and defoamer, heat to 80-90℃, maintain for 15-30 minutes, cool to 60-70℃ and add glycerin, keep warm for 20-30 minutes, cool to 50-60℃, add fragrance and component C while stirring, stir and mix evenly, and continue to cool to below 40℃ to obtain acrylic emulsion.

[0013] Furthermore, in step (1), the stirring speed is 600-800 rpm; in step (2), the stirring speed is 200-300 rpm; in step (3), the stirring speed is 400-500 rpm; and in step (4), the stirring speed is 800-1000 rpm.

[0014] Furthermore, step (4) is followed by step (5), which specifically involves adding the acrylic emulsion to the extrusion pen for use.

[0015] Furthermore, the extrusion pen includes a telescopic column, a lifting column, a pressing buckle, a pen body, and a replaceable dispensing head. The replaceable dispensing head is threadedly connected to the bottom of the pen body. The pen body has a first hollow channel and a second hollow channel, which are connected by an air vent. The telescopic column is inserted into the first hollow channel from the top of the pen body, and the lifting column is inserted into the second hollow channel from the top of the pen body. The pen body has a groove, and the pressing buckle is fixed in the groove by a movable shaft. The groove has a rectangular elongated hole, and the back of the pressing buckle has a protrusion that is inserted into the rectangular elongated hole. When the pressing buckle is pressed down into the groove, the protrusion contacts the bottom of the lifting column and lifts the lifting column upward.

[0016] Furthermore, the ratio of the inner diameter of the first hollow channel to the inner diameter of the second hollow channel is 3-5:1, and the ratio of the length of the first hollow channel to the length of the second hollow channel is 7-8:1.

[0017] Furthermore, the length of the portion of the lifting column located within the second hollow channel is equal to the length of the second hollow channel.

[0018] Furthermore, the extrusion pen also includes a first sealing ring, a second sealing ring, and a third sealing sleeve. The first sealing ring and the third sealing sleeve are sleeved on the telescopic column. The first sealing ring is located at the connection between the telescopic column and the first hollow channel, and the third sealing sleeve is located at the bottom of the telescopic column. Both the first sealing ring and the third sealing sleeve are in contact with the inner wall of the first hollow channel. The second sealing ring is located at the connection between the lifting column and the second hollow channel, and the second sealing ring is in contact with the inner wall of the second hollow channel.

[0019] Furthermore, a lifting ring is provided at the top of the lifting column.

[0020] This invention provides an acrylic emulsion and its preparation method, which has the following main advantages: it is environmentally friendly and harmless, does not affect children's health, is not prone to aging, is easy to clean, and has a high solid content and low viscosity. Attached Figure Description

[0021] Figure 1 is a three-dimensional structural diagram of the extrusion pen mentioned in the method for preparing an acrylic emulsion according to the present invention.

[0022] Figure 2 is a schematic diagram of the main structure of the extrusion pen mentioned in the preparation method of an acrylic emulsion according to the present invention.

[0023] Among them, 1 is the telescopic column, 2 is the lifting column, 3 is the press buckle, 4 is the pen body, 5 is the replaceable dispensing head, and 6 is the lifting ring. Detailed Implementation

[0024] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, the technical solutions of the present invention are further described below with reference to embodiments. However, the present invention is not limited to the listed embodiments, but should also include any other known modifications within the scope of the claims of the present invention.

[0025] First, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places throughout this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0026] Example 1: (1) At room temperature, deionized water, 8% polyvinylpyrrolidone, and 3% sodium stearate were added to the reaction vessel, heated to 80°C, stirred and dissolved, and after complete dissolution, heating was stopped to obtain component A.

[0027] (2) At room temperature, 4% polyethylene glycol, 9% waterborne acrylic resin, 1% dispersant and 1% emulsifier are stirred and mixed for 10 minutes, heated to 60°C and kept for 60 minutes to obtain component B;

[0028] (3) At room temperature, 1% water-based pigment, 0.1% bisphenol A and 0.1% sodium dodecyl sulfonate are stirred and mixed to obtain component C;

[0029] (4) At room temperature, mix and stir components A, B and 0.1% of defoamer, heat to 80°C, maintain for 15 minutes, cool to 60°C and add 6% glycerin, keep warm for 20 minutes, cool to 50°C, add 0.04% fragrance and component C while stirring, stir and mix evenly, and continue to cool to below 40°C to obtain acrylic emulsion.

[0030] Example 2: (1) At room temperature, deionized water, 9% polyvinylpyrrolidone, and 4% sodium stearate were added to the reaction vessel, heated to 85°C, stirred and dissolved, and after complete dissolution, heating was stopped to obtain component A;

[0031] (2) At room temperature, 5% polyethylene glycol, 12% waterborne acrylic resin, 2% dispersant and 2% emulsifier are stirred and mixed for 15 minutes, heated to 65°C and kept for 65 minutes to obtain component B;

[0032] (3) At room temperature, 2% water-based pigment, 1% bisphenol A and 0.3% sodium dodecyl sulfonate are stirred and mixed to obtain component C;

[0033] (4) At room temperature, mix and stir components A, B and 0.3% defoamer, heat to 85°C, maintain for 22 minutes, cool to 65°C and add 7% glycerin, keep warm for 25 minutes, cool to 55°C, add 0.05% fragrance and component C while stirring, stir and mix evenly, and continue to cool to below 40°C to obtain acrylic emulsion.

[0034] Example 3: (1) At room temperature, deionized water, 10% polyvinylpyrrolidone, and 5% sodium stearate were added to the reaction vessel, heated to 90°C, stirred and dissolved, and after complete dissolution, heating was stopped to obtain component A.

[0035] (2) At room temperature, 6% polyethylene glycol, 15% waterborne acrylic resin, 3% dispersant and 3% emulsifier are stirred and mixed for 20 minutes, heated to 70°C and kept for 70 minutes to obtain component B;

[0036] (3) At room temperature, 3% water-based pigment, 1.5% bisphenol A and 0.4 parts sodium dodecyl sulfonate are stirred and mixed to obtain component C;

[0037] (4) At room temperature, mix and stir components A, B and 0.4% defoamer, heat to 90°C, maintain for 30 minutes, cool to 70°C and add 9% glycerin, keep warm for 30 minutes, cool to 60°C, add 0.06% fragrance and component C while stirring, stir and mix evenly, and continue to cool to below 40°C to obtain acrylic emulsion.

[0038] In the three embodiments described above, the prepared acrylic emulsion can be contained using an extrusion pen, making it easier to apply. Please refer to Figures 1 and 2 for the specific structure of the extrusion pen. Figure 1 is a three-dimensional structural diagram of the extrusion pen mentioned in the method for preparing an acrylic emulsion according to the present invention; Figure 2 is a front view structural diagram of the extrusion pen mentioned in the method for preparing an acrylic emulsion according to the present invention. As shown in Figures 1 and 2, the extrusion pen includes a telescopic column 1, a lifting column 2, a pressing buckle 3, a pen body 4, a replaceable dispensing head 5, and a lifting ring 6. The pen body 4 is used for gripping, and multiple sets of stripes are provided on the surface of the pen body 4 to increase friction and make it easier to grip. The pen body 4 has a first hollow channel (not shown) and a second hollow channel (not shown) inside. The first hollow channel (not shown) is a channel that runs vertically through the pen body 4 to contain the acrylic emulsion. The replaceable dispensing head 5 is connected to the bottom of the pen body 4 by a thread (not shown), and the bottom end of the first hollow channel is connected to the replaceable dispensing head 5, allowing the acrylic emulsion in the first hollow channel to be dispensed. A replaceable dispensing head 5 is provided for easy application. The replaceable dispensing head 5 also has a speed control structure to control the flow rate of the acrylic emulsion. The telescopic column 1 is inserted into the first hollow channel from the top of the pen body 4. When acrylic emulsion needs to be injected, the telescopic column 1 can be pulled out to pour the acrylic emulsion into the first hollow channel. In order to facilitate pressure balance and avoid the acrylic emulsion from flowing out too quickly or intermittently, an air vent (not shown) is provided between the first hollow channel and the second hollow channel. The lifting column 2 is inserted into the second hollow channel from the top of the pen body 4. In order to facilitate the removal and carrying of the lifting column 2, a lifting ring 6 is provided at the top of the lifting column 2. After the acrylic emulsion is poured into the first hollow channel, excess air can enter the second hollow channel through the vent and be discharged from the top. After discharge, the lifting column 2 can be tightened. To facilitate the downward insertion of the lifting column 2 into the second hollow channel and the upward opening for ventilation, a groove (not shown) is provided on the pen body 4. The pressing buckle 3 is fixed in the groove by a movable shaft. The groove has a rectangular elongated hole (not shown), and the back of the pressing buckle 3 has a protrusion (not shown). The protrusion is inserted into the rectangular elongated hole. When the pressing buckle 3 is pressed down into the groove, the protrusion contacts the bottom of the lifting column 2 and lifts the lifting column 2. When the pressing buckle 3 is lifted, part of the pressing buckle 3 is lifted out of the groove, and the protrusion guides the lifting column 2 to move upward. To better achieve the balance between air and liquid and ensure the outflow rate of the acrylic emulsion, the ratio of the inner diameter of the first hollow channel to the inner diameter of the second hollow channel is 3~5:1, and the ratio of the length of the first hollow channel to the length of the second hollow channel is 7~8:1. Under the above ratio conditions, the acrylic emulsion can maintain a smooth but not too fast flow rate. In addition, the length of the part of the lifting column 2 located in the second hollow channel is equal to the length of the second hollow channel.Considering the risk of drying of acrylic emulsion and the potential leakage of liquid and gas, a first sealing ring (not shown) and a third sealing sleeve (not shown) are fitted on the telescopic column 1. The first sealing ring is located at the connection between the telescopic column 1 and the first hollow channel, and the third sealing sleeve is located at the bottom of the telescopic column 1. Both the first sealing ring and the third sealing sleeve are in contact with the inner wall of the first hollow channel. A second sealing ring (not shown) is located at the connection between the lifting column 2 and the second hollow channel. The second sealing ring is in contact with the inner wall of the second hollow channel.

[0039] Table 1 shows a comparison between Examples 1-3 and the prior art:

[0040]

[0041] Table 1

[0042] In Table 1, the aqueous pigments containing harmful substances in the formulations of Examples 1-3 are encapsulated within the particles, forming a protective layer that allows the pigments to develop color while ensuring that no harmful substances are released.

[0043] After the acrylic emulsion of the present invention was crushed and pulverized again, the harmful components were detected as shown in Table 2:

[0044]

[0045] Table 2

[0046] As can be seen from Table 2, the content of harmful substances in the acrylic emulsion of the present invention is significantly lower than that of conventional pigments, and it meets national standards.

[0047] Compared with the prior art, the beneficial effects of the acrylic emulsion of the present invention are: environmentally friendly and harmless, does not affect children's health, is not prone to aging, and is easy to clean.

[0048] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An acrylic emulsion, characterized in that: The composition, calculated by weight percentage, includes 9% polyvinylpyrrolidone, 4% sodium stearate, 5% polyethylene glycol, 12% waterborne acrylic resin, 2% dispersant, 2% emulsifier, 2% waterborne pigment, 1% bisphenol A, 0.3% sodium dodecyl sulfonate, 7% glycerin, 0.05% fragrance, 0.3% defoamer, and the remainder being deionized water. The preparation method includes the following steps: (1) At room temperature, add deionized water, polyvinylpyrrolidone, and sodium stearate to the reaction vessel, heat to 80-90℃, and stir at 600-800 rpm to dissolve. After complete dissolution, stop heating to obtain component A; (2) At room temperature, stir and mix polyethylene glycol, waterborne acrylic resin, dispersant, and emulsifier at 200-300 rpm for 10-20 minutes, heat to 60-70℃, and maintain for 60-70 minutes. (3) At room temperature, water-based pigment, bisphenol A, and sodium dodecyl sulfonate are stirred and mixed at a speed of 400-500 rpm to obtain component C; (4) At room temperature, components A, B, and defoamer are mixed and stirred, heated to 80-90℃, maintained for 15-30 minutes, cooled to 60-70℃ and then glycerin is added. After maintaining the temperature for 20-30 minutes, the temperature is lowered to 50-60℃, and fragrance and component C are added while stirring at a speed of 800-1000 rpm. After stirring and mixing evenly, the temperature is further lowered to below 40℃ to obtain an acrylic emulsion; (5) The acrylic emulsion is added to an extrusion pen. The extrusion pen, used in [the context of the invention], includes a telescopic column, a lifting column, a pressing buckle, a pen body, and a replaceable dispensing head. The replaceable dispensing head is threadedly connected to the bottom of the pen body. The pen body has a first hollow channel and a second hollow channel, which are connected by an air vent. The telescopic column is inserted into the first hollow channel from the top of the pen body, and the lifting column is inserted into the second hollow channel from the top of the pen body. The pen body has a groove, and the pressing buckle is fixed in the groove by a movable shaft. The groove has a rectangular elongated hole, and the back of the pressing buckle has a protrusion that inserts into the rectangular hole. Inside the elongated hole, when the pressing buckle is pressed down into the groove, the protrusion contacts the bottom of the lifting post and lifts the lifting post upwards. The extrusion pen also includes a first sealing ring, a second sealing ring, and a third sealing sleeve. The first sealing ring and the third sealing sleeve are fitted onto the telescopic post. The first sealing ring is located at the connection between the telescopic post and the first hollow channel, and the third sealing sleeve is located at the bottom of the telescopic post. Both the first sealing ring and the third sealing sleeve fit against the inner wall of the first hollow channel. The second sealing ring is located at the connection between the lifting post and the second hollow channel, and the second sealing ring fits against the inner wall of the second hollow channel.

2. An acrylic emulsion according to claim 1, characterized in that: The ratio of the inner diameter of the first hollow channel to the inner diameter of the second hollow channel is 3-5:1, and the ratio of the length of the first hollow channel to the length of the second hollow channel is 7-8:

1.

3. An acrylic emulsion according to claim 1, characterized in that: The length of the portion of the lifting column located within the second hollow channel is equal to the length of the second hollow channel.

4. An acrylic emulsion according to claim 1, characterized in that: A lifting ring is inserted through the top of the lifting column.

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