Paint coating with demolding effect and preparation method thereof

Abstract

The invention provides a paint coating with a demolding effect, and the paint coating comprises the following raw materials in parts by weight: 100 parts of a main agent which comprises 35-45 parts of hydroxy acrylic resin, 18-22 parts of a filler, 4-6 parts of an auxiliary agent, 4-6 parts of fluorine-containing silane, 10-15 parts of a solvent, 12-14 parts of polyaniline and 1-2 parts of ferriporphyrin; and 20-25 parts of a curing agent. The invention further provides a preparation method of the paint coating with the demolding effect. According to the anti-static paint coating, the compatibility of the acrylic resin and all components in the paint coating is improved by adopting the hydroxy acrylic resin, the hydrophobicity of the paint coating is improved through the fluorosilane, the overall anti-static performance of the paint coating is achieved by adding the polyaniline in the scheme, and the anti-static performance of the paint coating is further improved by adding the ferriporphyrin. According to the paint coating with the demolding effect, the problem that due to the electrostatic interaction, concrete adheres to a formwork in the demolding process of demolding paint is solved.

Description

Technical Field

[0001] The present application relates to the technical field of mold release agents, and in particular to a paint coating with a mold 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 of concrete components from formwork and 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, the patent application CN114907772A uses heptadecafluorodecyl fluorosilane with trichloromethylsilylethyl side chain as the base material, the main chain is a silicon oxygen bond, and the side chain is a non-polar group methyl. Due to the wrapping of the side chain, the entire molecular chain is non-polar, 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 on the coating are further reduced, and the demoulding effect is enhanced. However, the technical solution disclosed in this document still has the problem of adhesion to the template. Summary of the invention

[0005] With regard to the situation that 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 demoulding effect, the paint coating comprising 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 scheme, hydroxy 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 scheme also adds polyaniline to achieve the overall antistatic performance of the paint coating, and by adding iron porphyrin, the antistatic performance of the paint coating is further improved. The paint coating with demoulding effect of the present invention solves the problem of concrete adhering to the formwork during the demoulding process of the demoulding paint due to static electricity.

[0008] In order to improve the antistatic performance of the paint with demoulding effect of the present invention, the connection structure of polyaniline, iron porphyrin and hydroxy acrylic resin in the paint 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 the above scheme, the macromolecular polyaniline molecular chain has conductive properties, and the small molecular iron porphyrin has conductive properties. Through the small molecular iron porphyrin, the electrons gathered on the acrylic resin body can be quickly diverted to the polyaniline molecular chain, and then the polyaniline molecular chain diverts the electrons evenly to the entire coating, thereby quickly reducing the surface resistance of a certain part of the paint coating, thereby reducing the overall resistance of the coating and immediately exerting an antistatic effect. Further, the polyaniline molecular chain can divert electrons to the template to achieve electron diversion, thereby exerting an antistatic effect.

[0010] In order to improve the uniformity of mixing of the components in the paint coating, preferably, the auxiliary agent includes at least one of a dispersant, a defoamer 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 coatings, 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 of hydroxy acrylic resin and 6 to 8 parts of organic solvent by mass 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 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 into 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 scheme, after the hydroxy acrylic resin emulsion and the polyaniline emulsion are modified by iron porphyrin, the hydroxy acrylic resin emulsion modified by iron porphyrin and the polyaniline emulsion modified by iron porphyrin are fully mixed, thereby ensuring 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. The antistatic performance of the paint coating is improved.

[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 coatings. The above scheme also adds polyaniline to achieve the overall antistatic performance of the paint coatings, and by adding iron porphyrin, the antistatic performance of the paint coatings is further improved. The paint coatings with demoulding effect of the present invention solves the problem of concrete adhering to the formwork during the demoulding process of the demoulding paint due to static electricity.

[0025] The macromolecular polyaniline molecular chain has conductive properties, and the small molecular iron porphyrin has conductive properties. Through the small molecular iron porphyrin, the electrons gathered on the acrylic resin body can be quickly diverted to the polyaniline molecular chain, and then the polyaniline molecular chain diverts the electrons evenly to the entire coating, thereby quickly reducing the surface resistance of a certain part of the paint, thereby reducing the overall resistance of the coating and immediately exerting an antistatic effect. Furthermore, the polyaniline molecular chain can divert electrons to the template to achieve electron diversion, thereby exerting an antistatic effect.

[0026] After the hydroxy acrylic resin emulsion and the polyaniline emulsion are modified by iron porphyrin respectively, the hydroxy acrylic resin emulsion modified by iron porphyrin and the polyaniline emulsion modified by iron porphyrin are fully mixed, thereby ensuring 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 performance of the paint coating. DETAILED DESCRIPTION

[0027] The following is a detailed description of the embodiments of the technical solution of the present application. 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 cannot be used 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. Fully mix 35 to 45 parts of hydroxyl acrylic resin and 6 to 8 parts of organic solvent by mass to obtain a hydroxyl acrylic resin emulsion; in some embodiments of the present invention, the polymerizable monomer of the hydroxyl 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, mixing and dispersing the mixture sufficiently 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 sufficiently 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 coloring filler to the paint coating, and grinding the paint coating 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 to 45 parts of hydroxy acrylic resin, 18 to 22 parts of filler, 4 to 6 parts of auxiliary agent, 4 to 6 parts of fluorine-containing silane, 10 to 15 parts of solvent, 12 to 14 parts of polyaniline, 1 to 2 parts of iron porphyrin; 20 to 25 parts of curing agent. In the paint coating, 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.

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

[0039] Embodiment 1:

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

[0041] S1, fully mixing 40 parts by mass of hydroxyl acrylic resin and 7 parts by mass of DMAC to obtain a hydroxyl acrylic resin emulsion;

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

[0045] S5, after the iron porphyrin modified hydroxy acrylic resin emulsion and the iron porphyrin modified polyaniline emulsion are fully mixed, 5 parts of perfluoropropyl silane are added, and the fillers consisting of 6 parts of nano silicon dioxide, 7 parts of kaolin, and 7 parts of silicon nitride powder are fully mixed and dispersed, and then 5 parts of auxiliary agents consisting of 1.5 parts of dispersant, 1.5 parts of defoamer, and 2 parts of leveling agent are added, and the mixture is fully mixed and dispersed to obtain a paint coating main agent with a demoulding effect. See Table 1 for details.

[0046] Embodiment 2 to Embodiment 3

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

[0052] Comparative Example 2

[0053] The difference between Comparative Example 2 and Example 1 is that Comparative Example 2 does not contain polyaniline, and the other parts 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 parts are the same as Example 1, see 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 the above-mentioned 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, and then hexamethylene diisocyanate curing agent was added, and then the coating treatment was carried out. Two coats were sprayed, each with a coating thickness of 35 μm, to obtain a coating with a coating thickness of 70 μm and a coating amount of 0.22 kg / ㎡.

[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 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.

[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: Use a micro-current measuring instrument to perform volume resistivity test.

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

[0071] Table 3 Performance test of the coating obtained after coating with the main agent of the paint coating obtained in each embodiment and comparative example

[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 larger water contact angles, better hydrophobic properties, smaller volume resistivity, better antistatic properties, higher impact strength, lower 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, Comparative Example 3 has a higher volume resistivity than Comparative Example 1 and Comparative Example 2, and poorer mechanical properties, indicating that without adding polyaniline and iron porphyrin, the coating has almost no antistatic properties.

[0078] Comparative Example 4 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 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. It is explained that in Example 1, after the hydroxyl acrylic resin emulsion and the polyaniline emulsion are modified by iron porphyrin respectively, the iron porphyrin-modified hydroxyl 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 hydroxyl acrylic resin is: iron porphyrin is connected to the polyaniline molecular chain, and the iron porphyrin is connected to the hydroxyl acrylic resin, thereby improving the antistatic performance 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 it. 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 replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate 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 main agent, including: 35 to 45 parts of hydroxy acrylic resin, 18 to 22 parts of filler, 4 to 6 parts of auxiliary agent, 4 to 6 parts of fluorine-containing silane, 10 to 15 parts of solvent, 12 to 14 parts of polyaniline, and 1 to 2 parts of iron porphyrin; 20 to 25 parts of curing agent.

2. The paint coating with demoulding effect according to claim 1, characterized in that: In the paint coating, 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.

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

4. The paint coating according to claim 1, characterized in that: The curing agent includes: hexamethylene diisocyanate or isophorone diisocyanate.

5. The paint coating with demoulding effect according to claim 1, characterized in that: The filler includes at least one of nano silicon dioxide, kaolin and silicon nitride powder.

6. The paint coating with demoulding effect according to claim 1, characterized in that: The polymerizable monomer of the hydroxy acrylic resin is 2-hydroxyethyl acrylate.

7. 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.

8. A method for preparing the paint coating according to any one of claims 1 to 7, characterized in that: include: Fully mixing 35 to 45 parts of hydroxy acrylic resin and 6 to 8 parts of organic solvent by mass to obtain a hydroxy acrylic resin emulsion; Adding 2 to 3 parts of iron porphyrin to the hydroxy acrylic resin emulsion, mixing and dispersing the mixture sufficiently to obtain an iron porphyrin-modified hydroxy acrylic resin emulsion; Fully mixing 12 to 15 parts of polyaniline with 4 to 7 parts of an organic solvent to obtain a polyaniline emulsion; Adding 1 to 2 parts of iron porphyrin into 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 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.

9. The preparation method according to claim 8, characterized in that: The invention also includes adding a tinting filler into the paint.

10. The preparation method according to claim 8, characterized in that: The method further comprises grinding the paint to a specific fineness.

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