Coating capable of sensing color change according to temperature and preparation method thereof

Abstract

The invention provides a coating capable of sensing color change according to temperature and a preparation method thereof. The coating comprises a base material and an additive, the base material is prepared from the following components in parts by weight: 45 to 60 parts of polyacrylate emulsion, 25 to 35 parts of temperature change microcapsules, 5 to 10 parts of reflective powder, 15 to 20 parts of methyl methacrylate, 15 to 20 parts of thiourea, 6 to 10 parts of D-sodium gluconate, 10 to 15 parts of benzotriazole, 11 to 13 parts of zinc phosphate, 5 to 8 parts of methyl violet and 5 to 13 parts of phenolphthalein; the additive is prepared from the following components in parts by weight: 0.2 to 0.3 part of an anti-aging agent, 0.5 to 0.9 part of an ultraviolet light absorber, 0.6 to 0.8 part of an antioxidant and 0.4 to 0.8 part of a hindered amine light stabilizer. By adding the ultraviolet light absorber, the damage of ultraviolet light to the temperature-sensing color-changing material in the coating is reduced, and the original color and performance of the coating are kept. Besides, by adding the hindered amine light stabilizer, the sensitivity of the coating to light is reduced, and the coating is protected from being damaged by ultraviolet rays, so that the color change stability of the coating is kept.

Description

Technical Field

[0001] The invention relates to the technical field of coatings, and in particular to a method for preparing a temperature-sensitive color-changing coating. Background Art

[0002] Temperature-sensitive color-changing paint, also known as heat-sensitive paint or thermochromic paint, is a special paint that can present different colors as the ambient temperature changes. Its color-changing principle is mainly based on the thermochromic materials in the paint, which will undergo physical or chemical changes at a specific temperature, thereby changing the color of the paint.

[0003] If the temperature-sensitive color-changing paint is exposed to ultraviolet light for a long time, the color-changing effect of the temperature-sensitive color-changing paint may be significantly reduced. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a temperature-sensitive color-changing coating and a preparation method thereof.

[0005] The object of the present invention is to provide a temperature-sensitive color-changing paint, the paint comprising a base material and an additive;

[0006] The base material comprises the following components in parts by weight: 45-60 parts of polyacrylate emulsion, 25-35 parts of temperature-dependent microcapsules, 5-10 parts of reflective powder, 15-20 parts of methyl methacrylate, 15-20 parts of thiourea, 6-10 parts of sodium D-gluconate, 10-15 parts of benzotriazole, 11-13 parts of zinc phosphate, 5-8 parts of methyl violet, and 5-13 parts of phenolphthalein;

[0007] The additives include the following components in parts by weight: 0.2-0.3 parts of an anti-aging agent, 0.5-0.9 parts of an ultraviolet absorber, 0.6-0.8 parts of an antioxidant, and 0.4-0.8 parts of a hindered amine light stabilizer.

[0008] The invention prepares the ultraviolet absorber by compounding dihydroxybenzophenone and ultraviolet absorber UV-P. After the two are mixed, π-π conjugated interaction exists to form a more stable structure, which helps to reduce the damage of ultraviolet rays to the temperature-sensitive color-changing material in the coating and maintain its original color and performance.

[0009] In addition, the present invention obtains a hindered amine light stabilizer by compounding piperidine, imidazolide and azacycloalkanone. Piperidine, imidazolide or azacycloalkanone can produce a synergistic effect when compounded, and the amino group in the piperidine, imidazolide or azacycloalkanone derivative generates nitroxide free radicals under ultraviolet irradiation, and the nitroxide free radicals can capture and quench free radicals such as alkyl free radicals, alkoxy free radicals, peroxy free radicals and singlet oxygen generated under ultraviolet irradiation, thereby reducing the sensitivity of the temperature-sensitive color-changing coating to light and protecting the coating from damage by ultraviolet rays, thereby maintaining the color-changing performance stability of the coating.

[0010] The present invention can ensure the stability and weather resistance of the temperature-sensitive color-changing coating by adding an anti-aging agent and an antioxidant during the preparation process of the temperature-sensitive color-changing coating.

[0011] Preferably, the ultraviolet absorber is prepared from dihydroxybenzophenone and ultraviolet absorber UV-P, and the weight ratio of dihydroxybenzophenone to ultraviolet absorber UV-P is (1-2):(3-4).

[0012] Preferably, the hindered amine light stabilizer is prepared from piperidine, imidazolone and azacycloalkanone, and the weight ratio of piperidine, imidazolone and azacycloalkanone is (1-2): (2-4): (2-3).

[0013] Preferably, the antioxidant is prepared from thiodipropionate and triethyl phosphite, and the weight ratio of thiodipropionate to triethyl phosphite is (1-2):(2-4).

[0014] Preferably, the temperature-sensitive color-changing coating further comprises an auxiliary agent, and the auxiliary agent comprises the following components in parts by weight: 0.1-0.9 parts of a thickener, 0.3-0.5 parts of a dispersant, 0.1-0.2 parts of a leveling agent, and 0.1-0.3 parts of a defoaming agent.

[0015] Another object of the present invention is to provide a method for preparing a temperature-sensitive color-changing coating, comprising the following steps:

[0016] S1. The polyacrylate emulsion and the solvent are mixed and ground, and filtered under a 0.35-0.55 μm filter membrane and an operating pressure of 0.3-0.5 MPa to obtain a mixture A;

[0017] S2. The temperature-dependent microcapsules, the reflective powder, the methyl methacrylate, the thiourea, the sodium D-gluconate, the benzotriazole, the zinc phosphate, the methyl violet, and the phenolphthalein are uniformly mixed to obtain a mixture B;

[0018] S3. The additive and the mixture B are mixed evenly, ground, and filtered under a 0.35-0.55 μm filter membrane and an operating pressure of 0.3-0.5 MPa to obtain a mixture C;

[0019] S4. The additive and the mixture C are mixed evenly, ground, filtered through a 0.35-0.55 μm filter membrane and an operating pressure of 0.3-0.5 MPa, and allowed to stand to obtain a temperature-sensitive color-changing paint.

[0020] Preferably, the rotation speed of the stirring kettle in step S1 is 10000-12000 rpm, the stirring time is 15-35 min, and the stirring temperature is 25-30°C.

[0021] Preferably, in step S2, the rotation speed of the stirring kettle is 800-1000 rpm, the stirring time is 20-40 min, and the stirring temperature is 15-25°C.

[0022] Preferably, in step S3, the rotation speed of the stirring kettle is 500-700 rpm, the stirring time is 15-20 min, and the stirring temperature is 25-30°C.

[0023] Preferably, in step S4, the rotation speed of the stirring kettle is 500-800 rpm, the stirring time is 25-50 min, and the stirring temperature is 15-20°C. DETAILED DESCRIPTION

[0024] The following is a further clear and complete description of the technical features in the technical solution provided by the present invention in conjunction with the specific implementation methods. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0025] Example 1

[0026] This embodiment provides a temperature-sensitive color-changing coating, and the specific preparation method is as follows:

[0027] 1. Raw material preparation:

[0028] Base material: 45 parts of polyacrylate soft emulsion, 150 parts of water, 25 parts of temperature-dependent microcapsules, 5 parts of reflective powder, 15 parts of methyl methacrylate, 15 parts of thiourea, 6 parts of sodium D-gluconate, 10 parts of benzotriazole, 11 parts of zinc phosphate, 5 parts of methyl violet, and 5 parts of phenolphthalein;

[0029] Additives: 0.2 parts of antioxidant, 0.5 parts of ultraviolet absorber, 0.6 parts of antioxidant, 0.4 parts of hindered amine light stabilizer;

[0030] Additives: 0.1 part thickener, 0.3 part dispersant, 0.1 part leveling agent, 0.1 part defoamer.

[0031] 2. Preparation of temperature-sensitive color-changing coating:

[0032] a: placing the polyacrylate emulsion and the solvent in a stirring tank for mixing and stirring to obtain a mixture A. The speed of the stirring tank is 1000 rpm, the stirring time is 15 min, and the stirring temperature is 25° C.;

[0033] b: placing the mixture A in a grinding machine for grinding to obtain a mixture B;

[0034] c: Filter the mixture B through a bag filter and let it stand to obtain a mixture C. The precision of the filter bag of the bag filter is 0.35 μm, and the operating pressure of the bag filter is 0.3 MPa;

[0035] d: Place the temperature-dependent microcapsules, reflective powder, methyl methacrylate, thiourea, sodium D-gluconate, benzotriazole, zinc phosphate, methyl violet and phenolphthalein in a stirring kettle, add mixture C, and stir evenly to obtain mixture D. The speed of the stirring kettle is 800 rpm, the stirring time is 20 min, and the stirring temperature is 15°C;

[0036] e: placing an anti-aging agent, an ultraviolet absorber, an antioxidant, and a hindered amine light stabilizer in a stirring kettle, adding the mixture D, and stirring evenly to obtain a mixture E. The speed of the stirring kettle is 500 rpm, the stirring time is 15 min, and the stirring temperature is 25°C;

[0037] f: placing the mixture E in a grinding machine for grinding to obtain a mixture F;

[0038] g: Place the mixture F in a bag filter for filtration and allow to stand to obtain a mixture G. The precision of the filter bag of the bag filter is 0.35 μm, and the operating pressure of the bag filter is 0.3 MPa;

[0039] h: placing thickener, dispersant, leveling agent and defoamer in a stirring kettle, adding mixture G, and stirring evenly to obtain mixture H. The speed of the stirring kettle is 500 rpm, the stirring time is 25 min, and the stirring temperature is 15°C;

[0040] i: placing the mixture H in a dispersion vessel for stirring and dispersion treatment to obtain a mixture I;

[0041] j: placing the mixture I in a sand mill for dispersion and grinding to obtain a mixture J;

[0042] k: The mixture J is placed in a bag filter for filtering, and allowed to stand to obtain a temperature-sensitive color-changing coating, and the temperature-sensitive color-changing coating is sealed and packaged. The filter bag of the bag filter has a precision of 0.22 μm, and the operating pressure of the bag filter is 0.3 MPa.

[0043] The ultraviolet absorber is prepared from dihydroxybenzophenone and ultraviolet absorber UV-P, and the weight ratio of dihydroxybenzophenone to ultraviolet absorber UV-P is 1:3.

[0044] Among them, the linear speed of the stirring shaft of the sand mill is 9 m / s, and the dispersion and grinding time of the sand mill is 20 min.

[0045] The antioxidant is prepared from thiodipropionate and triethyl phosphite, and the weight ratio of thiodipropionate to triethyl phosphite is 1:2.

[0046] Among them, the hindered amine light stabilizer is prepared from piperidine, imidazolone and azacycloalkanone, and the weight ratio of piperidine, imidazolone and azacycloalkanone is 1:2:2.

[0047] The standing time of mixture B and mixture F was 1 h, and the standing time of mixture J was 2 h.

[0048] Example 2

[0049] This embodiment provides a temperature-sensitive color-changing coating, and the specific preparation method is as follows:

[0050] 1. Raw material preparation:

[0051] Base material: 60 parts of polyacrylate soft emulsion, 160 parts of water, 35 parts of temperature-dependent microcapsules, 10 parts of reflective powder, 20 parts of methyl methacrylate, 20 parts of thiourea, 10 parts of sodium D-gluconate, 15 parts of benzotriazole, 13 parts of zinc phosphate, 8 parts of methyl violet, and 13 parts of phenolphthalein;

[0052] Additives: 0.3 parts of antioxidant, 0.9 parts of ultraviolet absorber, 0.8 parts of antioxidant, 0.8 parts of hindered amine light stabilizer;

[0053] Additives: 0.9 parts of thickener, 0.5 parts of dispersant, 0.2 parts of leveling agent, and 0.3 parts of defoaming agent.

[0054] 2. Preparation of temperature-sensitive color-changing coating:

[0055] a: placing the polyacrylate emulsion and the solvent in a stirring tank for mixing and stirring to obtain a mixture A. The speed of the stirring tank is 11000 rpm, the stirring time is 35 min, and the stirring temperature is 30°C;

[0056] b: placing the mixture A in a grinding machine for grinding to obtain a mixture B;

[0057] c: Filter the mixture B through a bag filter and let it stand to obtain a mixture C. The precision of the filter bag of the bag filter is 0.55 μm, and the operating pressure of the bag filter is 0.5 MPa;

[0058] d: Place the temperature-dependent microcapsules, reflective powder, methyl methacrylate, thiourea, sodium D-gluconate, benzotriazole, zinc phosphate, methyl violet and phenolphthalein in a stirring kettle, add mixture C, and stir evenly to obtain mixture D. The speed of the stirring kettle is 1000 rpm, the stirring time is 40 min, and the stirring temperature is 25°C;

[0059] e: placing an anti-aging agent, an ultraviolet absorber, an antioxidant, and a hindered amine light stabilizer in a stirring kettle, adding the mixture D, and stirring evenly to obtain a mixture E. The speed of the stirring kettle is 700 rpm, the stirring time is 20 min, and the stirring temperature is 30° C.;

[0060] f: placing the mixture E in a grinding machine for grinding to obtain a mixture F;

[0061] g: Place the mixture F in a bag filter for filtration and allow to stand to obtain a mixture G. The precision of the filter bag of the bag filter is 0.55 μm, and the operating pressure of the bag filter is 0.5 MPa;

[0062] h: placing thickener, dispersant, leveling agent and defoamer in a stirring tank, adding mixture G, and stirring evenly to obtain mixture H. The speed of the stirring tank is 800 rpm, the stirring time is 50 min, and the stirring temperature is 20°C;

[0063] i: placing the mixture H in a dispersion vessel for stirring and dispersion treatment to obtain a mixture I;

[0064] j: placing the mixture I in a sand mill for dispersion and grinding to obtain a mixture J;

[0065] k: The mixture J is placed in a bag filter for filtering, and allowed to stand to obtain a temperature-sensitive color-changing coating, and the temperature-sensitive color-changing coating is sealed and packaged. The filter bag of the bag filter has a precision of 0.45 μm, and the operating pressure of the bag filter is 0.5 MPa.

[0066] The ultraviolet absorber is prepared from dihydroxybenzophenone and ultraviolet absorber UV-P, and the weight ratio of dihydroxybenzophenone to ultraviolet absorber UV-P is 2:4.

[0067] Among them, the linear speed of the stirring shaft of the sand mill is 12m / s, and the dispersion and grinding time of the sand mill is 25min.

[0068] The antioxidant is prepared from thiodipropionate and triethyl phosphite, and the weight ratio of thiodipropionate to triethyl phosphite is 2:4.

[0069] Among them, the hindered amine light stabilizer is prepared from piperidine, imidazolone and azacycloalkanone, and the weight ratio of piperidine, imidazolone and azacycloalkanone is 2:4:3.

[0070] The standing time of mixture B and mixture F was 1.5 h, and the standing time of mixture J was 2.5 h.

[0071] Example 3

[0072] This embodiment provides a temperature-sensitive color-changing coating, and the specific preparation method is as follows:

[0073] 1. Raw material preparation:

[0074] Base material: 50 parts of polyacrylate soft emulsion, 155 parts of water, 30 parts of temperature-dependent microcapsules, 8 parts of reflective powder, 18 parts of methyl methacrylate, 18 parts of thiourea, 8 parts of sodium D-gluconate, 13 parts of benzotriazole, 12 parts of zinc phosphate, 7 parts of methyl violet, and 9 parts of phenolphthalein;

[0075] Additives: 0.25 parts of antioxidant, 0.7 parts of ultraviolet absorber, 0.7 parts of antioxidant, 0.6 parts of hindered amine light stabilizer;

[0076] Additives: 0.5 parts of thickener, 0.4 parts of dispersant, 0.15 parts of leveling agent, and 0.2 parts of defoaming agent.

[0077] 2. Preparation of temperature-sensitive color-changing coating:

[0078] a: placing the polyacrylate emulsion and the solvent in a stirring tank for mixing and stirring to obtain a mixture A. The speed of the stirring tank is 12000 rpm, the stirring time is 25 min, and the stirring temperature is 28°C;

[0079] b: placing the mixture A in a grinding machine for grinding to obtain a mixture B;

[0080] c: Place the mixture B in a bag filter for filtration and let it stand to obtain a mixture C. The precision of the filter bag of the bag filter is 0.45 μm, and the operating pressure of the bag filter is 0.4 MPa;

[0081] d: Place the temperature-dependent microcapsules, reflective powder, methyl methacrylate, thiourea, sodium D-gluconate, benzotriazole, zinc phosphate, methyl violet and phenolphthalein in a stirring kettle, add mixture C, and stir evenly to obtain mixture D. The speed of the stirring kettle is 900 rpm, the stirring time is 30 min, and the stirring temperature is 20°C;

[0082] e: placing an anti-aging agent, an ultraviolet absorber, an antioxidant, and a hindered amine light stabilizer in a stirring kettle, adding the mixture D, and stirring evenly to obtain a mixture E. The rotation speed of the stirring kettle is 600 rpm, the stirring time is 18 min, and the stirring temperature is 28° C.;

[0083] f: placing the mixture E in a grinding machine for grinding to obtain a mixture F;

[0084] g: Place the mixture F in a bag filter for filtration and let it stand to obtain a mixture G. The precision of the filter bag of the bag filter is 0.45 μm, and the operating pressure of the bag filter is 0.4 MPa;

[0085] h: placing thickener, dispersant, leveling agent and defoamer in a stirring tank, adding mixture G, and stirring evenly to obtain mixture H. The speed of the stirring tank is 650 rpm, the stirring time is 38 min, and the stirring temperature is 18°C;

[0086] i: placing the mixture H in a dispersion vessel for stirring and dispersion treatment to obtain a mixture I;

[0087] j: placing the mixture I in a sand mill for dispersion and grinding to obtain a mixture J;

[0088] k: The mixture J is placed in a bag filter for filtering, and allowed to stand to obtain a temperature-sensitive color-changing coating, and the temperature-sensitive color-changing coating is sealed and packaged. The filter bag of the bag filter has a precision of 0.34 μm, and the operating pressure of the bag filter is 0.4 MPa.

[0089] The ultraviolet absorber is prepared from dihydroxybenzophenone and ultraviolet absorber UV-P, and the weight ratio of dihydroxybenzophenone to ultraviolet absorber UV-P is 1.5:3.5.

[0090] Among them, the linear speed of the stirring shaft of the sand mill is 10m / s, and the dispersion and grinding time of the sand mill is 23min.

[0091] The antioxidant is prepared from thiodipropionate and triethyl phosphite, and the weight ratio of thiodipropionate to triethyl phosphite is 1.5:3.

[0092] Among them, the hindered amine light stabilizer is prepared from piperidine, imidazolone and azacycloalkanone, and the weight ratio of piperidine, imidazolone and azacycloalkanone is 1.5:3:2.5.

[0093] The standing time of mixture B and mixture F was 1.3 h, and the standing time of mixture J was 2.3 h.

[0094] Example 4

[0095] This embodiment provides a temperature-sensitive color-changing coating. Compared with Embodiment 1, the difference in structure is that the ultraviolet absorber is prepared from dihydroxybenzophenone only. Except for the above difference, the materials, formula ratios and preparation operations used in this embodiment are strictly consistent with those in Embodiment 1.

[0096] Example 5

[0097] This embodiment provides a temperature-sensitive color-changing coating, and compared with Example 1, the difference in composition is that the hindered amine light stabilizer is prepared from piperidine and imidazolide, and the weight ratio of piperidine to imidazolide is 1:2. Except for the above differences, the materials, formula ratios and preparation operations used in this embodiment are strictly consistent with those in Example 1.

[0098] Example 6

[0099] This embodiment provides a temperature-sensitive color-changing coating, and compared with the embodiment 1, the difference in composition is that the antioxidant is prepared from thiodipropionate only. In addition to the above differences, the materials, formula ratios and preparation operations used in this embodiment are strictly consistent with those in the embodiment 1.

[0100] Test Case

[0101] The temperature-sensitive color-changing paint prepared in Examples 1-6 and a common temperature-sensitive color-changing paint were selected for coating test. The temperature-sensitive color-changing paint and a common temperature-sensitive color-changing paint were coated on the sample and waited for them to dry and solidify, and then the light sensitivity test was performed. The final test results are shown in Table 1:

[0102] Table 1 Test results of relevant properties of temperature-sensitive color-changing coatings

[0103]

[0104] The temperature-sensitive color-changing coatings in Example 1, Example 2 and Example 3 did not change in color or only slightly faded after 6 hours of ultraviolet light irradiation, and were able to return to the original color (blue). This shows that these coatings have good color stability under lighting conditions. In contrast, the color of the ordinary temperature-sensitive color-changing coating changed significantly (to green) under the same conditions, and failed to return to the original color. This shows that its color stability is poor.

[0105] In Example 4, the ultraviolet absorber is prepared only from dihydroxybenzophenone. After 6 hours of ultraviolet light irradiation, the color of the coating becomes slightly lighter. It can be inferred that dihydroxybenzophenone itself has a certain ultraviolet absorption capacity, but its ultraviolet absorption capacity is worse than that of the coating prepared in Example 1.

[0106] In Example 5, the hindered amine light stabilizer is prepared from piperidine and imidazolide, and does not contain azacycloalkanone. Compared with Example 1, the lack of azacycloalkanone affects the overall effect of the light stabilizer.

[0107] In Example 6, the antioxidant was prepared from thiodipropionate only. Compared with Example 1, the color of the coating was slightly lighter, and the antioxidant effect of thiodipropionate when used alone was worse than that when used in combination with thiodipropionate and triethyl phosphite.

[0108] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the protection scope of the present invention. Although the present invention is described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the technical solutions of the present invention can be modified or equivalently replaced, but these modifications or replacements are all within the protection scope of the present invention.

Claims

1. A temperature-sensitive color-changing paint, characterized in that: Including base materials and additives; The base material comprises the following components in parts by weight: 45-60 parts of polyacrylate emulsion, 25-35 parts of temperature-dependent microcapsules, 5-10 parts of reflective powder, 15-20 parts of methyl methacrylate, 15-20 parts of thiourea, 6-10 parts of sodium D-gluconate, 10-15 parts of benzotriazole, 11-13 parts of zinc phosphate, 5-8 parts of methyl violet, and 5-13 parts of phenolphthalein; The additive comprises the following components in parts by weight: 0.2-0.3 parts of an anti-aging agent, 0.5-0.9 parts of an ultraviolet absorber, 0.6-0.8 parts of an antioxidant, and 0.4-0.8 parts of a hindered amine light stabilizer.

2. The temperature-sensitive color-changing paint according to claim 1, characterized in that: The ultraviolet absorber is prepared from dihydroxybenzophenone and ultraviolet absorber UV-P, and the weight ratio of dihydroxybenzophenone to ultraviolet absorber UV-P is (1-2): (3-4).

3. The temperature-sensitive color-changing paint according to claim 1, characterized in that: The hindered amine light stabilizer is prepared from piperidine, imidazolone and azacycloalkanone, and the weight ratio of piperidine, imidazolone and azacycloalkanone is (1-2): (2-4): (2-3).

4. The temperature-sensitive color-changing paint according to claim 1, characterized in that: The antioxidant is prepared from thiodipropionate and triethyl phosphite, and the weight ratio of thiodipropionate to triethyl phosphite is (1-2): (2-4).

5. The temperature-sensitive color-changing paint according to claim 1, characterized in that: The temperature-sensitive color-changing paint also includes an auxiliary agent, which includes the following components in parts by weight: 0.1-0.9 parts of a thickener, 0.3-0.5 parts of a dispersant, 0.1-0.2 parts of a leveling agent, and 0.1-0.3 parts of a defoaming agent.

6. A method for preparing a temperature-sensitive color-changing coating as claimed in any one of claims 1 to 5, characterized in that: The following steps are involved: S1. The polyacrylate emulsion and the solvent are mixed and ground, and filtered under a 0.35-0.55 μm filter membrane and an operating pressure of 0.3-0.5 MPa to obtain a mixture A; S2. The temperature-dependent microcapsules, the reflective powder, the methyl methacrylate, the thiourea, the sodium D-gluconate, the benzotriazole, the zinc phosphate, the methyl violet, and the phenolphthalein are uniformly mixed to obtain a mixture B; S3. The additive and the mixture B are mixed evenly, ground, and filtered under a 0.35-0.55 μm filter membrane and an operating pressure of 0.3-0.5 MPa to obtain a mixture C; S4. The additive and the mixture C are mixed evenly, ground, filtered through a 0.35-0.55 μm filter membrane and an operating pressure of 0.3-0.5 MPa, and allowed to stand to obtain a temperature-sensitive color-changing paint.

7. The preparation method according to claim 6, characterized in that: In step S1, the rotation speed of the stirring kettle is 10000-12000 rpm, the stirring time is 15-35 min, and the stirring temperature is 25-30°C.

8. The preparation method according to claim 6, characterized in that: In step S2, the rotation speed of the stirring kettle is 800-1000 rpm, the stirring time is 20-40 min, and the stirring temperature is 15-25°C.

9. The preparation method according to claim 6, characterized in that: In step S3, the rotation speed of the stirring kettle is 500-700 rpm, the stirring time is 15-20 min, and the stirring temperature is 25-30°C.

10. The preparation method according to claim 6, characterized in that: In step S4, the rotation speed of the stirring kettle is 500-800 rpm, the stirring time is 25-50 min, and the stirring temperature is 15-20°C.

Images