Paint coating with demoulding effect and preparation method thereof

Abstract

The present invention provides a paint coating with a mold release effect. The paint coating comprises the following raw materials by weight: 100 parts of a main agent, including 35-45 parts of a hydroxylated acrylic resin, 18-22 parts of a filler, 4-6 parts of an auxiliary agent, 4-6 parts of a fluorinated silane, 10-15 parts of a solvent, 12-14 parts of polyaniline, and 1-2 parts of iron porphyrin; and 20-25 parts of a curing agent. The present invention also provides a method for preparing the paint coating with a mold release effect. The present invention utilizes hydroxylated acrylic resin to improve the compatibility of the acrylic resin with the various components of the paint coating, and utilizes fluorinated silane to enhance the hydrophobicity of the paint coating. Furthermore, the aforementioned solution incorporates polyaniline to achieve overall antistatic properties, and the addition of iron porphyrin further enhances the paint coating's antistatic properties. The present paint coating with a mold release effect solves the problem of concrete adhering to the formwork during the demolding process due to static electricity.

Description

Technical Field

[0001] The present application relates to the technical field of release agents, and in particular to a paint coating with a release effect and a preparation method thereof. Background Art

[0002] Release paint is a type of coating used during concrete construction to facilitate the separation between concrete components and formwork. It is a type of release agent.

[0003] Although the prior art has disclosed a large number of hydrophobic and oleophobic release paints, there are still cases where concrete adheres to the formwork during the demoulding process.

[0004] For example, patent application publication CN114907772A uses heptadecafluorodecylfluorosilane with trichloromethylsilylethyl side chains as the base material. The main chain is a siloxane bond, and the side chains are non-polar methyl groups. Due to the encapsulation of the side chains, the entire molecular chain exhibits non-polarity, has good hydrophobicity, and has a good anti-sticking effect on polar substances in concrete. By adding polymer micropowders and fillers of appropriate types and proportions, the surface energy of the coating and the adhesion of concrete to the coating are further reduced, thereby enhancing the demolding effect. However, the technical solution disclosed in this document still has the problem of adhesion to the formwork. Summary of the Invention

[0005] Regarding the situation in which the concrete adheres to the formwork during the demoulding process of the above-mentioned hydrophobic and oleophobic release paint, the applicant found that the reason is that the hydrophobic and oleophobic antistatic effect is poor.

[0006] In order to solve the above problems, the present invention proposes a paint coating with a demoulding effect, which includes the following raw materials by weight: 100 parts of a main agent, including: 35 to 45 parts of a hydroxy acrylic resin, 18 to 22 parts of a filler, 4 to 6 parts of an auxiliary agent, 4 to 6 parts of a fluorine-containing silane, 10 to 15 parts of a solvent, 12 to 14 parts of polyaniline, 1 to 2 parts of iron porphyrin; and 20 to 25 parts of a curing agent.

[0007] Through the above technical solution, hydroxy acrylic resin is used to improve the compatibility of acrylic resin with various components in paint and coating, and fluorosilane is used to improve the hydrophobicity of the paint and coating. The above solution also adds polyaniline to achieve the overall antistatic performance of the paint and coating, and the antistatic performance of the paint and coating is further improved by adding iron porphyrin. The paint and coating with a demoulding effect of the present invention solves the problem of concrete adhering to the formwork during the demoulding process due to static electricity.

[0008] In order to improve the antistatic performance of the paint coating with a demoulding effect of the present invention, the connection structure of polyaniline, iron porphyrin and hydroxy acrylic resin in the paint coating of the present invention is: iron porphyrin is connected to the polyaniline molecular chain, and the iron porphyrin is connected to the hydroxy acrylic resin.

[0009] Through this scheme, the large polyaniline molecular chains possess conductive properties, and the small iron porphyrin molecules also possess conductive properties. The small iron porphyrin molecules rapidly channel electrons accumulated in the acrylic resin bulk to the polyaniline molecular chains, which then evenly distribute the electrons throughout the entire coating. This rapidly reduces the surface resistance of a specific area of ​​the paint, thereby reducing the overall resistance of the coating and immediately exerting an antistatic effect. Furthermore, the polyaniline molecular chains channel electrons to the template, achieving electron conduction and thus exerting an antistatic effect.

[0010] In order to improve the uniformity of mixing of various components in the paint coating, preferably, the auxiliary agent includes at least one of a dispersant, a defoaming agent, and a leveling agent.

[0011] In order to improve the curing effect of the paint coating, preferably, the curing agent includes: hexamethylene diisocyanate or isophorone diisocyanate.

[0012] In order to improve the mechanical properties of paint and coating, preferably, the filler includes at least one of nano-silicon dioxide, kaolin, and silicon nitride powder.

[0013] Optionally, the polymerized monomer of the hydroxy acrylic resin is 2-hydroxyethyl acrylate.

[0014] Based on the same inventive concept of the above-mentioned paint coating with demoulding effect, the present application also provides a method for preparing the above-mentioned paint coating, comprising:

[0015] Fully mixing 35 to 45 parts by mass of a hydroxy acrylic resin with 6 to 8 parts by mass of an organic solvent to obtain a hydroxy acrylic resin emulsion;

[0016] Adding 2 to 3 parts of iron porphyrin to the hydroxy acrylic resin emulsion, fully mixing and dispersing the mixture to obtain an iron porphyrin-modified hydroxy acrylic resin emulsion;

[0017] Fully mixing 12 to 15 parts of polyaniline with 4 to 7 parts of an organic solvent to obtain a polyaniline emulsion;

[0018] Adding 1 to 2 parts of iron porphyrin to the polyaniline emulsion, fully mixing and dispersing the mixture to obtain an iron porphyrin-modified polyaniline emulsion;

[0019] The iron porphyrin-modified hydroxy acrylic resin emulsion and the iron porphyrin-modified polyaniline emulsion are fully mixed, 4 to 6 parts of fluorine-containing silane are added, and the mixture is fully mixed and dispersed. Then, 18 to 22 parts of filler are added, and the mixture is fully mixed and dispersed. Then, 4 to 6 parts of auxiliary agent are added, and the mixture is fully mixed and dispersed to obtain a paint coating main agent with a demoulding effect.

[0020] Through the above technical solution, after the hydroxyl acrylic resin emulsion and polyaniline emulsion are modified with iron porphyrin, the iron porphyrin-modified hydroxyl acrylic resin emulsion and the iron porphyrin-modified polyaniline emulsion are fully mixed. This ensures that the polyaniline, iron porphyrin, and hydroxyl acrylic resin have a connection structure in which the iron porphyrin is connected to the polyaniline molecular chain, and the iron porphyrin is connected to the hydroxyl acrylic resin. This improves the antistatic properties of the paint coating.

[0021] In order to match the color of the paint, preferably, a color-matching filler is added to the paint.

[0022] In order to obtain a paint coating with a specific fineness, preferably the method further comprises grinding the paint coating to a specific fineness.

[0023] The technical effects of this application are:

[0024] Hydroxylated acrylic resin is used to improve the compatibility of acrylic resin with various components in paint coatings, and fluorosilane is used to improve the hydrophobicity of the paint coating. The above solution also adds polyaniline to achieve the overall antistatic performance of the paint coating, and the antistatic performance of the paint coating is further improved by adding iron porphyrin. The paint coating with a demoulding effect of the present invention solves the problem of concrete adhering to the formwork during the demoulding process due to static electricity.

[0025] The large polyaniline molecular chains are conductive, as are the small iron porphyrin molecules. The small iron porphyrin molecules rapidly channel electrons accumulated in the acrylic resin to the polyaniline chains, which then evenly distribute the electrons throughout the coating. This rapidly reduces the surface resistance of a specific area of ​​the paint, thereby reducing the overall resistance of the coating and immediately exerting an antistatic effect. Furthermore, the polyaniline chains channel electrons to the template, achieving electron conduction and thus an antistatic effect.

[0026] After the hydroxy acrylic resin emulsion and the polyaniline emulsion are modified respectively by iron porphyrin, the iron porphyrin-modified hydroxy acrylic resin emulsion and the iron porphyrin-modified polyaniline emulsion are fully mixed, thereby ensuring that the connection structure of the polyaniline, iron porphyrin and hydroxy acrylic resin is: the iron porphyrin is connected to the polyaniline molecular chain, and the iron porphyrin is connected to the hydroxy acrylic resin, thereby improving the antistatic performance of the paint coating. DETAILED DESCRIPTION

[0027] The following embodiments of the technical solution of the present application are described in detail. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only used as examples and are not intended to limit the scope of protection of the present application.

[0028] The present invention provides a method for preparing a paint coating with a demoulding effect, comprising:

[0029] S1. Thoroughly mix 35 to 45 parts by mass of a hydroxy acrylic resin with 6 to 8 parts by mass of an organic solvent to obtain a hydroxy acrylic resin emulsion; in some embodiments of the present invention, the polymerizable monomer of the hydroxy acrylic resin is 2-hydroxyethyl acrylate; in some embodiments of the present invention, the organic solvent may include NMP, DMAC, DMF, etc.;

[0030] S2, adding 2 to 3 parts of iron porphyrin to the hydroxylated acrylic resin emulsion, fully mixing and dispersing the mixture to obtain an iron porphyrin-modified hydroxylated acrylic resin emulsion;

[0031] S3, fully mixing 12 to 15 parts of polyaniline and 4 to 7 parts of an organic solvent to obtain a polyaniline emulsion;

[0032] S4, adding 1 to 2 parts of iron porphyrin to the polyaniline emulsion, mixing and dispersing the mixture thoroughly to obtain an iron porphyrin-modified polyaniline emulsion;

[0033] S5. After fully mixing the iron porphyrin-modified hydroxy acrylic resin emulsion and the iron porphyrin-modified polyaniline emulsion, add 4 to 6 parts of fluorine-containing silane, mix and disperse them thoroughly, then add 18 to 22 parts of filler, mix and disperse them thoroughly, and then add 4 to 6 parts of auxiliary agents, mix and disperse them thoroughly to obtain a paint coating main agent with a demoulding effect. In some embodiments of the present invention, the auxiliary agent includes: at least one of a dispersant, a defoamer, and a leveling agent; the curing agent includes: hexamethylene diisocyanate or isophorone diisocyanate; the filler includes at least one of nano-silica, kaolin, and silicon nitride powder; the fluorine-containing silane includes at least one of trifluoromethylsilane, hexafluoroethylsilane, perfluoropropylsilane, perfluorobutylsilane, trifluoromethyltrimethylsilane, trifluoromethyltriethylsilane, and trifluoromethyltripropylsilane.

[0034] Preferably, the method further comprises: adding a color-adjusting filler to the paint; and grinding the paint to a specific fineness.

[0035] It should be noted that the above steps S1 and S2 can be performed simultaneously or in any order.

[0036] The paint coating with demoulding effect can be obtained by the above scheme, and the paint coating comprises the following raw materials by weight:

[0037] 100 parts of the main agent include: 35-45 parts of hydroxylated acrylic resin, 18-22 parts of filler, 4-6 parts of additives, 4-6 parts of fluorinated silane, 10-15 parts of solvent, 12-14 parts of polyaniline, 1-2 parts of iron porphyrin, and 20-25 parts of curing agent. In the paint, the polyaniline, iron porphyrin, and hydroxylated acrylic resin are connected in a structure in which the iron porphyrin is attached to the polyaniline molecular chain, which is then connected to the hydroxylated acrylic resin.

[0038] The present invention is described below by means of specific embodiments.

[0039] Example 1:

[0040] A method for preparing a paint coating with a demoulding effect, comprising:

[0041] S1. Thoroughly mix 40 parts by mass of hydroxy acrylic resin and 7 parts by mass of DMAC to obtain a hydroxy acrylic resin emulsion;

[0042] S2, adding 3 parts of iron porphyrin to the hydroxylated acrylic resin emulsion, mixing and dispersing the mixture thoroughly to obtain an iron porphyrin-modified hydroxylated acrylic resin emulsion;

[0043] S3, fully mixing 13 parts of polyaniline and 6 parts of organic solvent to obtain a polyaniline emulsion;

[0044] S4, adding 1 part of iron porphyrin to the polyaniline emulsion, mixing and dispersing the mixture thoroughly to obtain an iron porphyrin-modified polyaniline emulsion;

[0045] S5. After thoroughly mixing the iron porphyrin-modified hydroxy acrylic resin emulsion and the iron porphyrin-modified polyaniline emulsion, 5 parts of perfluoropropylsilane were added and mixed and dispersed thoroughly. Then, a filler consisting of 6 parts of nano-silica, 7 parts of kaolin, and 7 parts of silicon nitride powder was added and mixed and dispersed thoroughly. Then, 5 parts of auxiliary agents consisting of 1.5 parts of dispersant, 1.5 parts of defoamer, and 2 parts of leveling agent were added and mixed and dispersed thoroughly to obtain a paint base with a release effect. See Table 1 for details.

[0046] Example 2 to Example 3

[0047] The difference between Examples 2 and 3 and Example 1 is that the material composition control conditions in each step are different from those in Example 1. Other conditions are the same as those in Example 1. See Table 1 for details.

[0048] Example 4

[0049] The difference between Example 4 and Example 1 is that the polymerization monomer used in the acrylic resin is methyl acrylate, and the rest is the same as Example 1, see Table 1 for details.

[0050] Comparative Example 1

[0051] The difference between Comparative Example 1 and Example 1 is that Comparative Example 1 does not contain iron porphyrin, and the other contents are the same as those of Example 1, as shown in Table 1.

[0052] Comparative Example 2

[0053] The difference between Comparative Example 2 and Example 1 is that Comparative Example 2 does not contain polyaniline. Other aspects are the same as Example 1. See Table 1 for details.

[0054] Comparative Example 3

[0055] The difference between Comparative Example 3 and Example 1 is that Comparative Example 3 does not contain polyaniline and iron porphyrin, and the other contents are the same as those of Example 1, as shown in Table 1 for details.

[0056] Comparative Example 4

[0057] The difference between Comparative Example 4 and Example 1 is that step S2 of Comparative Example 4 does not contain iron porphyrin, and the rest is the same as Example 1, see Table 1 for details.

[0058] Comparative Example 5

[0059] The difference between Comparative Example 5 and Example 1 is that step S4 of Comparative Example 5 does not contain iron porphyrin, and the rest is the same as Example 1, see Table 1 for details.

[0060] Table 1 Control conditions of ingredients in each step of each embodiment and comparative example

[0061]

[0062] The paint coating main agent obtained in Examples 1 to 4 and Comparative Examples 1 to 5 was added and ground to less than 5 μm, and the same proportion of red pigment was added. Then, hexamethylene diisocyanate curing agent was added and the coating was treated by spraying two coats with a thickness of 35 μm each, to obtain a coating with a film thickness of 70 μm and a coating amount of 0.22 kg / m2.

[0063] The ratios of the main agent and the curing agent in Examples 1 to 4 and Comparative Examples 1 to 5 are shown in Table 2.

[0064] Table 2 Proportions of the paint base and curing agent obtained in each embodiment and comparative example

[0065]

[0066]

[0067] After adding a curing agent to the paint coatings obtained in Examples 1 to 4 and Comparative Examples 1 to 5, a coating treatment was performed to obtain the hydrophobicity, antistatic property, hydrophobicity, and mechanical properties of the coating films.

[0068] Hydrophobic performance test: The surface water contact angle of the coating was tested using the sessile drop method, with a water drop of 2 μL and a time of 10 s.

[0069] Antistatic performance test: Volume resistivity test is performed using a microcurrent meter.

[0070] The test results are shown in Table 3.

[0071] Table 3 Performance test results of the coating films obtained after coating with the main agents of the paints and coatings obtained in the examples and comparative examples

[0072] Contact angle / degree Volume resistivity / Ω·m Impact strength / cm Flexibility / mm Example 1 124 <![CDATA[7.8×10 8 ]]> 73 0.4 Example 2 123 <![CDATA[7.8×10 8 ]]> 72 0.4 Example 3 123 <![CDATA[7.8×10 8 ]]> 71 0.4 Example 4 118 <![CDATA[9.2×10 8 ]]> 61 0.7 Comparative Example 1 123 <![CDATA[2.4×10 9 ]]> 66 0.8 Comparative Example 2 123 <![CDATA[3.2×10 10 ]]> 68 0.5 Comparative Example 3 123 <![CDATA[2.5×10 13 ]]> 64 0.9 Comparative Example 4 123 <![CDATA[9.8×10 8 ]]> 69 0.5 Comparative Example 5 123 <![CDATA[9.7×10 8 ]]> 70 0.5

[0073] It can be seen from Table 3 that the coating films obtained in Examples 1 to 3 have a large water contact angle, good hydrophobicity, low volume resistivity, good antistatic performance, high impact strength, low flexibility, and better mechanical properties.

[0074] The water contact angle of the coating film obtained in Example 4 is smaller than that in Examples 1 to 3, and the mechanical properties and antistatic properties are relatively poor. This is because the acrylic resin used in Example 4 has not been subjected to hydroxyl modification treatment, resulting in poor compatibility between the acrylic resin and other components, which ultimately affects the hydrophobicity, antistatic properties and mechanical properties of the coating film.

[0075] Compared with Example 1, the volume resistivity of Comparative Example 1 is significantly higher and the mechanical properties are poor, indicating that without adding iron porphyrin, the antistatic properties of the coating will be significantly reduced, and the mechanical properties of the coating will also be affected to a certain extent.

[0076] Compared with Example 1, the volume resistivity of Comparative Example 2 is significantly higher and higher than that of Comparative Example 1, but the mechanical properties are better than those of Comparative Example 1, indicating that polyaniline can significantly affect the antistatic properties of the coating.

[0077] Compared with Example 1, the volume resistivity of Comparative Example 3 is higher, and higher than that of Comparative Example 1 and Comparative Example 2, and the mechanical properties are poor, indicating that without adding polyaniline and iron porphyrin, the coating film has almost no antistatic properties.

[0078] Compared with Example 1, the volume resistivity of Comparative Example 3 is higher, but lower than that of Comparative Example 1, but the mechanical properties are slightly inferior to those of Example 1. Compared with Example 1, the volume resistivity of Comparative Example 3 is higher, but lower than that of Comparative Example 1, but the mechanical properties are slightly inferior to those of Example 1. Comparative Example 5 is compared with Example 1, and the volume resistivity of Comparative Example 3 is higher, but lower than that of Comparative Example 1, but the mechanical properties are slightly inferior to those of Example 1. This shows that in Example 1, after the hydroxy acrylic resin emulsion and the polyaniline emulsion are modified by iron porphyrin respectively, the iron porphyrin-modified hydroxy acrylic resin emulsion and the iron porphyrin-modified polyaniline emulsion are fully mixed, which can ensure that the connection structure of polyaniline, iron porphyrin, and hydroxy acrylic resin is: iron porphyrin is connected to the polyaniline molecular chain, and the iron porphyrin is connected to the hydroxy acrylic resin, thereby improving the antistatic properties of the paint coating.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A paint coating with a demoulding effect, characterized in that: The paint coating comprises the following raw materials by weight: 100 parts of the main agent, including: 35 to 45 parts of hydroxy acrylic resin, 18 to 22 parts of filler, 4 to 6 parts of additives, 4 to 6 parts of fluorinated silane, 10 to 15 parts of solvent, 12 to 14 parts of polyaniline, and 1 to 2 parts of iron porphyrin; 20~25 parts of curing agent; In the paint, the connection structure of polyaniline, iron porphyrin and hydroxy acrylic resin is: iron porphyrin is connected to the polyaniline molecular chain, and the iron porphyrin is connected to the hydroxy acrylic resin; The filler includes at least one of nano silicon dioxide, kaolin and silicon nitride powder; the polymerization monomer of the hydroxy acrylic resin is 2-hydroxyethyl acrylate; and the curing agent includes hexamethylene diisocyanate or isophorone diisocyanate.

2. The paint coating with release effect according to claim 1, characterized in that: The auxiliary agent includes at least one of a dispersant, a defoaming agent and a leveling agent.

3. The paint coating with demoulding effect according to claim 1, characterized in that: The fluorine-containing silane includes at least one of trifluoromethylsilane, hexafluoroethylsilane, perfluoropropylsilane, perfluorobutylsilane, trifluoromethyltrimethylsilane, trifluoromethyltriethylsilane, and trifluoromethyltripropylsilane.

4. A method for preparing the paint according to any one of claims 1 to 3, characterized in that: include: Fully mixing 35 to 45 parts by mass of a hydroxy acrylic resin with 6 to 8 parts by mass of an organic solvent to obtain a hydroxy acrylic resin emulsion; Adding 2 to 3 parts of iron porphyrin to the hydroxy acrylic resin emulsion, fully mixing and dispersing the mixture to obtain an iron porphyrin-modified hydroxy acrylic resin emulsion; Fully mixing 12-15 parts of polyaniline with 4-7 parts of an organic solvent to obtain a polyaniline emulsion; Adding 1 to 2 parts of iron porphyrin to the polyaniline emulsion, fully mixing and dispersing the mixture to obtain an iron porphyrin-modified polyaniline emulsion; The iron porphyrin-modified hydroxy acrylic resin emulsion and the iron porphyrin-modified polyaniline emulsion are fully mixed, 4 to 6 parts of fluorinated silane are added, and the mixture is fully mixed and dispersed. Then, 18 to 22 parts of filler are added, and the mixture is fully mixed and dispersed. Then, 4 to 6 parts of auxiliary agent are added, and the mixture is fully mixed and dispersed to obtain a paint coating main agent with a demoulding effect.

5. The preparation method according to claim 4, characterized in that The invention also includes adding a tinting filler to the paint.

6. The preparation method according to claim 4, characterized in that The method further comprises grinding the paint to a specific fineness.

Images