A curtain coating paint additive and preparation method thereof

Abstract

The invention discloses a curtain coating paint additive and a preparation method thereof. The curtain coating paint additive comprises the following components and the weight proportion of each component is: 0.1 to 1 part of a viscous component, 10 to 15 parts of a surfactant, and 0.1 to 10 parts of a thickener. By adding a surfactant, PVA and a polymer thickener to the coating, the problem of poor product quality stability caused by the curtain jumping phenomenon is solved, the coating omission and rework in production are reduced, and the consistency of the product is improved.

Description

Technical Field

[0001] The invention relates to a curtain coating coating additive and a preparation method thereof. Background Art

[0002] With the development of industrial automation and fine chemicals, curtain coating technology has been widely used in the coatings industry due to its high efficiency and uniformity.

[0003] The curtain jumping phenomenon that often occurs during curtain coating leads to problems such as uneven coating and low product qualification rate, which seriously affects production efficiency and product quality. The occurrence of curtain jumping phenomenon is closely related to the rheological properties of the coating, especially the surface tension, viscosity and ductility of the coating.

[0004] Traditional curtain coating coatings often cannot effectively solve these problems. Therefore, developing curtain coating coating additives to improve coating performance, reduce curtain jumping, and improve coating quality and production efficiency has become an urgent need in the industry. Therefore, a curtain coating coating additive and a preparation method thereof are proposed. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a curtain coating paint additive and a preparation method thereof, which solves the problems of uneven coating and low product qualification rate caused by the curtain jumping phenomenon. The specific technical solution is as follows:

[0006] A curtain coating coating additive comprises the following components and the weight proportion of each component is:

[0007] The viscosity component is: 0.1 to 1 part,

[0008] Surfactant: 10 to 15 parts,

[0009] The amount of thickener is 0.1 to 10 parts.

[0010] As a preferred technical solution, the viscous component is a polyvinyl alcohol material, and the degree of alcoholysis of the polyvinyl alcohol material is 99% and the degree of polymerization is 2300-2500;

[0011] The surfactant is 2-sulfo-1,4-succinic acid di(2-ethylhexyl) ester sodium salt,

[0012] The thickener is a polymer thickener.

[0013] As a preferred technical solution, the ratio between the viscous component, the surfactant and the thickener is 1:10 to 15:1.

[0014] As a preferred technical solution, the viscous component accounts for 0.1%-1.0% of the weight of the coating, the surfactant accounts for 10%-15% of the weight of the coating, and the thickener accounts for 0.1%-10% of the weight of the coating.

[0015] As a preferred technical solution, the thickener includes a polyvinyl alcohol thickener and a polyacrylamide thickener.

[0016] A method for preparing a curtain coating coating additive comprises the following steps:

[0017] Step S1, preparing a surfactant solution;

[0018] Add the weighed surfactant into deionized water, heat and stir until completely dissolved to form a surfactant solution;

[0019] Step S2, preparing a polyvinyl alcohol solution;

[0020] Slowly add the viscous component into deionized water, heat to 60-80°C, and continue stirring until the polyvinyl alcohol material is completely dissolved to form a uniform polyvinyl alcohol solution;

[0021] Step S3, activating the thickener;

[0022] Add the thickener to deionized water, stir at room temperature to activate, add the activated thickener to deionized water, and continue stirring until it is completely dissolved.

[0023] Step S4, preparing additives;

[0024] The surfactant solution, the polyvinyl alcohol solution and the activated thickener solution are mixed at room temperature and the pH value is adjusted to 6-8 to form a uniform additive solution.

[0025] As a preferred technical solution, in step S1, preparing the surfactant solution, the heating temperature is 40-60°C, the stirring speed is 200-400 rpm; and the stirring time is 1-2 hours.

[0026] As a preferred technical solution, in step S2, preparing the polyvinyl alcohol solution, the stirring speed is 300-600 rpm and the stirring time is 2-4 hours.

[0027] As a preferred technical solution, in step S3, activating the thickener, the stirring speed is 100-300 rpm; and the stirring time is 30 minutes to 1 hour.

[0028] In step S4, during the preparation of the additive, the stirring speed is 300-600 rpm and the stirring time is 1-2 hours.

[0029] The beneficial effects of the present invention are:

[0030] The present invention reduces the surface tension of the coating by adding surfactants, PVA and polymer thickeners to the coating, improves the spreadability of the coating on the substrate, helps to form a uniform coating film, and reduces the unevenness during the coating process.

[0031] The use of high-polymerization PVA (alcoholysis degree 99%, polymerization degree 2300-2500) enhances the tensile strength of the coating, helps resist tensile forces during high-speed coating, and reduces coating breakage.

[0032] By increasing the coating's extension viscosity and tensile strength, the curtain stability is maintained under conditions of low solid content and low volume flow, effectively reducing or eliminating the curtain jumping phenomenon.

[0033] Select 2-sulfo-1,4-succinic acid di(2-ethylhexyl) ester sodium salt surfactant. When surfactants are mixed with water, they will disperse in the water to form tiny micelle structures. These micelles are composed of the hydrophilic groups of the surfactant facing the water and the hydrophobic groups facing the inside, thereby reducing the surface tension of the liquid;

[0034] In the coating system, PVA with alcoholysis degree of 99% and high polymerization degree is selected to improve the tensile strength of the coating, and polymer thickener is added to increase the extension viscosity. The stability of the curtain is maintained under the premise of low solid content and low coating volume flow, and the curtain jumping phenomenon is solved. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme of the present invention will be described clearly and completely in combination with the embodiments below. Embodiments 1 to 3 are for preparing curtain coating additives, comparative examples 1 to 3 are comparative examples, and embodiment 7 is an effect example.

[0036] Example 1

[0037] In three groups of reaction kettles, appropriate amounts of deionized water were added respectively, and then surfactants, PVA materials with alcoholysis degree of 99% and polymerization degree of 2300, and thickeners were added in sequence, and the heating temperatures were controlled to be 50° C., 70° C., and room temperature, respectively, and the stirring speeds were 300 rpm, 500 rpm, and 200 rpm, respectively, and the stirring time was 1.5 hours, 3 hours, and 50 minutes, respectively, to prepare surfactant solutions, polyvinyl alcohol solutions, and activated thickeners, respectively;

[0038] The prepared surfactant solution, polyvinyl alcohol solution and activated thickener were put into a reaction kettle and mixed at room temperature with a stirring speed of 400 rpm for 1.5 hours, and the pH value was adjusted to 7 to form a uniform additive solution.

[0039] Example 2

[0040] In three groups of reaction kettles, appropriate amounts of deionized water were added respectively, and then surfactants, PVA materials with alcoholysis degree of 99% and polymerization degree of 2400, and thickeners were added in sequence, and the heating temperatures were controlled to be 50° C., 70° C., and room temperature, respectively, and the stirring speeds were controlled to be 300 rpm, 500 rpm, and 200 rpm, respectively, and the stirring time was controlled to be 1.5 hours, 3 hours, and 50 minutes, respectively, to prepare surfactant solutions, polyvinyl alcohol solutions, and activated thickeners, respectively;

[0041] The prepared surfactant solution, polyvinyl alcohol solution and activated thickener were put into a reaction kettle and mixed at room temperature with a stirring speed of 400 rpm for 1.5 hours, and the pH value was adjusted to 7 to form a uniform additive solution.

[0042] Example 3

[0043] In three groups of reaction kettles, appropriate amounts of deionized water were added respectively, and then surfactants, PVA materials with alcoholysis degree of 99% and polymerization degree of 2500, and thickeners were added in sequence, and the heating temperatures were controlled to be 50° C., 70° C., and room temperature, respectively, and the stirring speeds were 300 rpm, 500 rpm, and 200 rpm, respectively, and the stirring time was 1.5 hours, 3 hours, and 50 minutes, respectively, to prepare surfactant solutions, polyvinyl alcohol solutions, and activated thickeners, respectively;

[0044] The prepared surfactant solution, polyvinyl alcohol solution and activated thickener were put into a reaction kettle and mixed at room temperature with a stirring speed of 400 rpm for 1.5 hours, and the pH value was adjusted to 7 to form a uniform additive solution.

[0045] Comparative Example 4

[0046] In two groups of reaction kettles, appropriate amount of deionized water was added respectively, and then PVA material with alcoholysis degree of 99% and polymerization degree of 2400 and thickener were added in sequence, and the heating temperature was controlled to be 70°C and room temperature respectively, and the stirring speed was 500rpm and 200rpm respectively, and the stirring time was 3 hours and 50 minutes respectively, to prepare polyvinyl alcohol solution and activated thickener respectively;

[0047] The prepared polyvinyl alcohol solution and activated thickener were put into a reaction kettle and mixed at room temperature with a stirring speed of 400 rpm for 1.5 hours to form a uniform additive solution.

[0048] Comparative Example 5

[0049] In three groups of reaction kettles, appropriate amounts of deionized water were added respectively, and then surfactants, PVA materials with alcoholysis degree of 99% and polymerization degree of 1800, and thickeners were added in sequence, and the heating temperatures were controlled to be 50° C., 70° C., and room temperature, respectively, and the stirring speeds were controlled to be 300 rpm, 500 rpm, and 200 rpm, respectively, and the stirring time was controlled to be 1.5 hours, 3 hours, and 50 minutes, respectively, to prepare surfactant solutions, polyvinyl alcohol solutions, and activated thickeners, respectively;

[0050] The prepared surfactant solution, polyvinyl alcohol solution and activated thickener were put into a reaction kettle and mixed at room temperature with a stirring speed of 400 rpm for 1.5 hours to form a uniform additive solution.

[0051] Comparative Example 6

[0052] In two groups of reaction kettles, appropriate amount of deionized water was added respectively, and then surfactant and PVA material with alcoholysis degree of 99% and polymerization degree of 2400 were added in sequence, and the heating temperature was controlled to be 50°C and 70°C respectively, the stirring speed was 300rpm and 500rpm respectively, and the stirring time was 1.5 hours and 3 hours respectively, to prepare surfactant solution and polyvinyl alcohol solution respectively;

[0053] The prepared surfactant solution and polyvinyl alcohol solution were put into a reaction kettle and mixed at room temperature with a stirring speed of 400 rpm for 1.5 hours to form a uniform additive solution.

[0054] Example 7 Effect Example

[0055] This example is an experiment of mixing the curtain coating additives prepared by Examples 1 to 3, Comparative Examples 1 to 3 and a commercial additive (PVA material with an alcoholysis degree of 99% and a polymerization degree of 1680-1880) with the coating as a control example, as shown in Table 1:

[0056] Table 1. Experimental results of mixing curtain coating additives with coatings

[0057]

[0058] It can be seen from the above table that after the curtain coating coating additive prepared by the method of the present invention is applied, the surface tension of the coating becomes lower. Compared with the control example and the comparative example, these lower surface tension values ​​help spread the coating on the substrate, reduce surface defects, and improve the uniformity and adhesion of the coating film.

[0059] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view. In addition, it should be understood that although this specification is described in accordance with the implementation mode, it does not include only one technical solution. This narrative mode of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in the embodiments can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A curtain coating coating additive, characterized in that: The composition comprises the following components and the weight proportions of each component are: The viscosity component is: 0.1 part ~ 1 part, Surfactant: 10 to 15 parts, Thickener: 0.1 parts to 10 parts.

2. The curtain coating coating additive according to claim 1, characterized in that: The viscous component is a polyvinyl alcohol material, and the degree of alcoholysis of the polyvinyl alcohol material is 99% and the degree of polymerization is 2300-2500; The surfactant is 2-sulfo-1,4-succinic acid di(2-ethylhexyl) ester sodium salt, The thickener is a polymer thickener.

3. The curtain coating coating additive according to claim 2, characterized in that: The ratio of the viscous component, the surfactant and the thickener is 1:10 to 15:

1.

4. The curtain coating coating additive according to claim 3, characterized in that: The viscous component accounts for 0.1%-1.0% of the weight of the coating, the surfactant accounts for 10%-15% of the weight of the coating, and the thickener accounts for 0.1%-10% of the weight of the coating.

5. The curtain coating coating additive according to claim 1, characterized in that: The thickener includes polyvinyl alcohol thickener and polyacrylamide thickener.

6. The method for preparing a curtain coating additive according to any one of claims 1 to 5, characterized in that: The following steps are involved: Step S1, preparing a surfactant solution; Add the weighed surfactant into deionized water, heat and stir until completely dissolved to form a surfactant solution; Step S2, preparing a polyvinyl alcohol solution; Slowly add the viscous component into deionized water, heat to 60-80°C, and continue stirring until the polyvinyl alcohol material is completely dissolved to form a uniform polyvinyl alcohol solution; Step S3, activating the thickener; Add the thickener to deionized water, stir and activate at room temperature, add the activated thickener to deionized water, and continue stirring until it is completely dissolved; . Step S4, preparing additives; The surfactant solution, the polyvinyl alcohol solution and the activated thickener solution are mixed at room temperature and the pH value is adjusted to 6-8 to form a uniform additive solution.

7. The method for preparing a curtain coating additive according to claim 6, characterized in that: In step S1, in preparing a surfactant solution, the heating temperature is 40-60° C., the stirring speed is 200-400 rpm, and the stirring time is 1-2 hours.

8. The method for preparing a curtain coating additive according to claim 6, characterized in that: In step S2, in preparing the polyvinyl alcohol solution, the stirring speed is 300-600 rpm and the stirring time is 2-4 hours.

9. The method for preparing a curtain coating additive according to claim 6, characterized in that: In step S3, activating the thickener, the stirring speed is 100-300 rpm; the stirring time is 30 minutes to 1 hour.

10. The method for preparing a curtain coating additive according to claim 6, characterized in that: In step S4, during the preparation of the additive, the stirring speed is 300-600 rpm and the stirring time is 1-2 hours.

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