Water-based single-component high-temperature after-tack-resistant solid-color coating as well as preparation method and application thereof

Abstract

The invention provides a water-based single-component high-temperature after-tack-resistant solid color paint and a preparation method and application thereof, and belongs to the technical field of paints.The water-based single-component high-temperature after-tack-resistant solid color paint is prepared from, by weight, 22.5-23.5 parts of water-based acrylic emulsion, 0.18-0.22 part of pH regulator, 0.3-0.7 part of dispersing agent, 0.2-0.4 part of defoaming agent, 0.2-0.4 part of wetting flatting agent, 3-7 parts of coalescing agent, 19-21.25 parts of water, 47-52 parts of pigment filler, 0.2-0.3 part of thickening agent and 0.08-0.12 part of preservative. The mass ratio of the pigment filler to the water-based acrylic emulsion is (2.1-2.2): 1; the Tg of the water-based acrylic emulsion is more than 40 DEG C and less than 43 DEG C. According to the technical scheme, the purposes that the high-temperature after-tack resistance of the coating is improved, and coating is convenient are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of coatings, and in particular to a water-based single-component high-temperature anti-sticking solid color coating, a preparation method thereof, and applications thereof. Background Art

[0002] High-temperature anti-sticking refers to the phenomenon that the surface coatings do not soften, deform or stick after a period of time when the coatings are stacked face to face and a certain pressure is applied in a specific high-temperature environment (80°C) (hot sticky and cold brittle).

[0003] The phenomenon of high-temperature back-sticking is mainly reflected in export trade. Export products are mainly transported by sea containers. During transportation, they need to pass through the high-temperature zone of the equator. The temperature inside the box can reach 70-80℃. The painted door panels or large panels are stacked very high, and the container transportation through the high-temperature zone of the equator is prone to adhesion problems.

[0004] Water-based two-component paints have a short pot life, slow drying time, and long delivery cycles, making them unsuitable for continuous factory production. Furthermore, the application process is complex. Conventional one-component water-based paints, when left unprotected, can easily soften at high temperatures, causing adhesion between workpieces and resulting in products that fail to meet product requirements. Summary of the Invention

[0005] In view of this, the present invention provides a water-based one-component high-temperature anti-sticking solid color coating and its preparation method and application, so as to achieve the purpose of improving the high-temperature anti-sticking performance of the coating and facilitating coating.

[0006] To achieve the above object, the present invention provides a water-based one-component high-temperature anti-sticking solid color coating, comprising the following raw materials in parts by weight: 22.5-23.5 parts of water-based acrylic emulsion, 0.18-0.22 parts of pH regulator, 0.3-0.7 parts of dispersant, 0.2-0.4 parts of defoamer, 0.2-0.4 parts of wetting and leveling agent, 3-7 parts of film-forming aid, 19-21.25 parts of water, 47-52 parts of pigments and fillers, 0.2-0.3 parts of thickener and 0.08-0.12 parts of preservative, wherein the mass ratio of the pigments and fillers to the water-based acrylic emulsion is 2.1-2.2:1; and the Tg of the water-based acrylic emulsion is 40°C < Tg < 43°C.

[0007] Optionally, the color filler is a pigment and a filler; the weight ratio of the pigment to the filler is 1:2~2.5.

[0008] Optionally, the pigment is titanium dioxide; the filler is talc and calcium carbonate; and the weight ratio of the talc to calcium carbonate is 1:1.

[0009] Optionally, the film-forming aid is one or a combination of two or more of dipropylene glycol methyl ether, dipropylene glycol butyl ether, diethylene glycol butyl ether, and diethylene glycol ethyl ether.

[0010] Optionally, the defoaming agent is one or a combination of two or more of BYK022, BYK024, BYK028, TEGO810, TEGO90W, TEGO902W, and TEGO845.

[0011] Optionally, the wetting and leveling agent is one or a combination of two or more of BYK-346, TEGO410, BYK-333, BYK-3455, TEGO270, KL245, and TEGO4100.

[0012] In order to achieve the above-mentioned purpose, the present invention also provides a preparation method of a water-based one-component high-temperature anti-rebound solid color coating, comprising the following steps: mixing a water-based acrylic emulsion with a pH regulator and a dispersant and stirring and dispersing them at a low speed to obtain a mixture A; further mixing a defoamer, a wetting and leveling agent, a film-forming aid and part of the water to obtain a mixture B; adding the mixture B to the mixture A and stirring and dispersing them at a medium speed to obtain a mixture C; adding a pigment, a thickener and the remaining water to the mixture C and stirring and dispersing them at a high speed, and finally adding a mildew inhibitor to obtain a water-based one-component high-temperature anti-rebound solid color coating.

[0013] Optionally, the speed of adding the mixed material B to the mixed material A is 2-4 kg / min, the mixed material A is stirred while the mixed material B is added, and the mixed material B is added from the center of the vortex of the mixed material A.

[0014] Optionally, the rotation speed of the low-speed stirring and dispersing is 500~600r / min, and the stirring time is 5~10min; the rotation speed of the medium-speed stirring and dispersing is 700~800r / min, and the stirring time is 8~12min; the rotation speed of the high-speed stirring and dispersing is 1200~1500r / min, and the stirring time is 20~30min.

[0015] In order to achieve the above-mentioned object, the present invention also provides a water-based single-component high-temperature anti-sticking solid color coating for use in protecting wood in high-temperature environments.

[0016] The above technical solution of the present invention includes at least the following beneficial effects: The technical solution provided by the present invention is achieved by adjusting the ratio of water-based acrylic emulsion and pigments and fillers in combination with a preparation method to obtain a water-based one-component high-temperature anti-sticking solid color coating. The coating has excellent anti-sticking performance at a high temperature of 80°C, good paint film fullness, good adhesion, and good yellowing resistance, especially strong anti-tannin and black edge covering performance in sand-through areas. At the same time, the coating is easy to use, can be used immediately after opening, and is green and environmentally friendly. DETAILED DESCRIPTION

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of the present invention.

[0018] For more specific description, some models or specifications of the components used in the present invention are as follows: water-based acrylic emulsion: W-3821; pH regulator: AMP-95; dispersant: Nopco 5040; defoaming agent: BYK022, BYK024, BYK028, TEGO810, TEGO90W, TEGO902W, TEGO845 or a combination of two or more; wetting and leveling agents: BYK-346, TEGO410, BYK-33 3. One or more of BYK-3455, TEGO270, KL245, and TEGO4100; the film-forming aid is one or more of dipropylene glycol methyl ether, dipropylene glycol butyl ether, diethylene glycol butyl ether, and diethylene glycol ethyl ether; titanium dioxide: Lomon 996; talc: 1250 mesh talc; calcium carbonate: 1250 mesh calcium carbonate; thickener: Mingling PUR-44; raw materials without given models or specifications can be routinely selected by those skilled in the art.

[0019] Example 1 The present invention provides a water-based one-component high-temperature anti-sticking solid color coating, comprising the following preparation steps: The following raw materials were prepared in parts by weight: 23 parts water-based acrylic emulsion, 0.2 parts pH adjuster, 0.5 parts dispersant, 0.3 parts defoamer, 0.3 parts wetting and leveling agent, 5 parts coalescing agent, 20.34 parts water, 50 parts pigments and fillers, 0.26 parts thickener, and 0.1 parts preservative. The pigments and fillers were pigments and fillers, with 15 parts titanium dioxide as the pigment, 17.5 parts talc, and 17.5 parts calcium carbonate as the fillers. The defoamer was BYK022; the wetting and leveling agent was BYK-346; and the coalescing agent was dipropylene glycol methyl ether. The weight ratio of pigments and fillers to water-based acrylic emulsion was 2.174:1, and the weight ratio of pigments and fillers was 1:2.3. The Tg of the water-based acrylic emulsion was 40°C < Tg < 43°C.

[0020] Add water-based acrylic emulsion into a dispersion tank, start the disperser, add pH regulator and dispersant into the dispersion tank, stir and disperse at a speed of 500 r / min for 10 minutes to obtain mixed material A; in addition, mix the defoamer, wetting and leveling agent, film-forming aid and 3 parts of water to obtain mixed material B; add mixed material B to mixed material A while stirring, add mixed material B from the vortex center of mixed material A, add mixed material B to mixed material A at a rate of 3 kg / min, and stir at a speed of 700 r / min for 10 minutes to obtain mixed material C; add pigments, fillers, thickeners and the remaining water to mixed material C, stir at a speed of 1200 r / min for 30 minutes, and finally add mildew inhibitor and mix well to obtain a water-based one-component high-temperature anti-rebound solid color coating.

[0021] Example 2 The present invention provides a water-based one-component high-temperature anti-sticking solid color coating, comprising the following preparation steps: The following raw materials were prepared in parts by weight: 22.5 parts water-based acrylic emulsion, 0.22 parts pH adjuster, 0.7 parts dispersant, 0.4 parts defoamer, 0.4 parts wetting and leveling agent, 7 parts coalescent, 21.25 parts water, 47.25 parts pigments and fillers, 0.2 parts thickener, and 0.08 parts preservative. The pigments and fillers are 15.75 parts titanium dioxide, 15.75 parts talc, and 15.75 parts calcium carbonate. The defoamers are TEGO902W and TEGO845; the wetting and leveling agents are KL245 and TEGO4100; and the coalescents are diethylene glycol butyl ether and diethylene glycol ethyl ether. The weight ratio of pigments and fillers to water-based acrylic emulsion is 2.1:1, and the weight ratio of pigments and fillers is 1:2. The Tg of the water-based acrylic emulsion is 40°C < Tg < 43°C.

[0022] Add water-based acrylic emulsion into a dispersion tank, start the disperser, add pH regulator and dispersant into the dispersion tank, stir and disperse at a speed of 550 r / min for 8 minutes to obtain mixed material A; in addition, mix the defoamer, wetting and leveling agent, film-forming aid and 3 parts of water to obtain mixed material B; add mixed material B to mixed material A while stirring, add mixed material B from the vortex center of mixed material A, add mixed material B to mixed material A at a rate of 2 kg / min, and stir at a speed of 800 r / min for 8 minutes to obtain mixed material C; add pigments, fillers, thickeners and the remaining water to mixed material C, stir at a speed of 1300 r / min for 25 minutes, and finally add mildew inhibitor and mix well to obtain a water-based one-component high-temperature anti-rebound solid color coating.

[0023] Example 3 The present invention provides a water-based one-component high-temperature anti-sticking solid color coating, comprising the following preparation steps: The following raw materials were prepared in parts by weight: 23.5 parts water-based acrylic emulsion, 0.18 parts pH adjuster, 0.3 parts dispersant, 0.2 parts defoamer, 0.2 parts wetting and leveling agent, 3 parts coalescent, 20.5 parts water, 51.7 parts pigments and fillers, 0.3 parts thickener, and 0.12 parts preservative. The pigments and fillers are pigments and fillers: 14.78 parts titanium dioxide, 18.46 parts talc, and 18.46 parts calcium carbonate. The defoamers are TEGO 810 and TEGO 90W; the wetting and leveling agents are TEGO 410 and BYK-333; and the coalescents are diethylene glycol butyl ether and diethylene glycol ethyl ether. The weight ratio of pigments and fillers to water-based acrylic emulsion is 2.2:1, and the weight ratio of pigments and fillers is 1:2.5. The Tg of the water-based acrylic emulsion is 40°C < Tg < 43°C.

[0024] Add water-based acrylic emulsion into a dispersion tank, start the disperser, add pH regulator and dispersant into the dispersion tank, stir and disperse at a speed of 600 r / min for 5 minutes to obtain mixed material A; in addition, mix the defoamer, wetting and leveling agent, film-forming aid and 3 parts of water to obtain mixed material B; add mixed material B to mixed material A while stirring, add mixed material B from the vortex center of mixed material A, add mixed material B to mixed material A at a rate of 4 kg / min, and stir at a speed of 750 r / min for 12 minutes to obtain mixed material C; add pigments, fillers, thickeners and the remaining water to mixed material C, stir at a speed of 1500 r / min for 20 minutes, and finally add mildew inhibitor and mix well to obtain a water-based one-component high-temperature anti-rebound solid color coating.

[0025] Example 4 The invention provides a water-based single-component high-temperature anti-sticking solid color coating for use in protecting wood in a high-temperature environment.

[0026] Test Experiment 1. The influence of Tg (glass transition temperature) value of water-based acrylic emulsion on coatings.

[0027] Emulsions 1 to 7, seven kinds of water-based acrylic emulsions, were used, with TG from low to high being <10°C, 23°C, 35°C, 40°C, 43°C, 80°C, and >100°C, respectively. The models, weight ratios, and preparation processes of the remaining raw materials were the same, and the corresponding settings were set as Experimental Examples 1 to 7; the raw material table is shown in Table 1, and the performance of Experimental Examples 1 to 7 was tested, and the results are shown in Table 2.

[0028] Table 1 Raw materials for Experimental Examples 1 to 7

[0029] Table 2 Performance results of coatings prepared in Experimental Examples 1 to 7

[0030] Note: In the tannin resistance test in the table, the value 5 is the best and 1 is the worst. For adhesion index, level 0 is the best and level 5 is the worst.

[0031] As shown in Tables 1 and 2, Experimental Examples 5 and 7 exhibited superior anti-sticking performance at 50°C, with Experimental Example 5 achieving the best performance. However, at 80°C, none of the above solutions achieved effective anti-sticking performance. Specifically, in the 50°C anti-sticking test, a higher TG yielded better anti-sticking performance but also decreased stability. At 80°C, the anti-sticking performance failed to meet the requirements.

[0032] Therefore, the present invention selects the Tg of the water-based acrylic emulsion to be 40°C<Tg<43°C.

[0033] 2. The influence of pigments and fillers on coatings.

[0034] The emulsion of Experimental Example 5 in Experiment 1 was used to further test the effects of pigments and fillers on the anti-rebound and stability of the coating.

[0035] The fillers used in Experimental Examples 8 to 16 were arranged in the following order: talc and calcium carbonate, calcium carbonate and calcined kaolin, talc and calcined kaolin, calcium carbonate and transparent powder, talc and transparent powder, calcium carbonate and precipitated barium sulfate, talc and precipitated barium sulfate, calcium carbonate and mica powder, and talc and mica powder. Only the filler composition differed; the remaining raw material types, weight ratios, and preparation methods were the same. A raw material table for Experimental Examples 8 to 16 is shown in Table 3, and the performance test results for Experimental Examples 8 to 16 are shown in Table 4.

[0036] Table 3 Raw materials of Experimental Examples 8 to 16

[0037] Table 4 Performance results of experimental examples 8 to 16

[0038] Note: In the tannin resistance test in the table, the value 5 is the best and 1 is the worst. For adhesion index, level 0 is the best and level 5 is the worst.

[0039] As shown in Tables 3 and 4, in the 50°C anti-adhesion test, all experimental examples were able to fall off naturally without damage. In the 80°C anti-adhesion test, Experiments 8 and 10 performed well, with Experiment 8 achieving the best results. Calcined kaolin is unstable in the system, and the viscosity tends to increase after storage, leading to gelation. While maintaining the emulsion content, increasing or replacing pigments and fillers can help with anti-adhesion. The greater the oil absorption, the higher the viscosity and the less stable the product. Among fillers, talc has a higher anti-adhesion performance than calcium carbonate ≧ kaolin, and then transparent powder, precipitated barium sulfate, and mica powder.

[0040] Therefore, the present invention selects a combination of talc and calcium carbonate as filler, and titanium dioxide as pigment.

[0041] 3. The influence of the ratio of water-based acrylic emulsion to pigments and fillers on coatings.

[0042] The Tg of the water-based acrylic emulsion is selected to be 40°C<Tg<43°C, i.e. the emulsion in Experimental Example 5; The filler type selected was a combination of talc and calcium carbonate, and the pigment selected was titanium dioxide, which was the pigment and filler component in Experimental Example 8.

[0043] The ratio of pigment filler to emulsion (i.e., pigment-to-base ratio) was adjusted to Experimental Examples 17 to 23. The raw material table of Experimental Examples 17 to 23 is shown in Table 5, and the performance test results table of Experimental Examples 17 to 23 is shown in Table 6.

[0044] Table 5 Raw materials for Experimental Examples 17 to 23

[0045] Table 6 Performance test results of experimental examples 17 to 23

[0046] Note: In the tannin resistance test in the table, the value 5 is the best and 1 is the worst. For adhesion index, level 0 is the best and level 5 is the worst.

[0047] As shown in Tables 5 and 6, in the 50°C anti-adhesion test, all experimental examples were able to fall off naturally without any damage. 80℃ anti-sticking test: In Experimental Examples 17 to 20, the pigment-to-base ratio was 1.67:1, and slight sticking occurred at 80°C. In Experiment 21, the pigment-to-base ratio was 2:1, and slight sticking still occurred at 80°C, but the degree was weaker than that of Experiments 17 to 20. In Experimental Example 22, the pigment-to-base ratio is 2.174:1, the anti-adhesion falls off naturally at 80°C, the paint film on the board surface is not damaged, and the thermal stability is good.

[0048] In Example 23, the pigment-to-base ratio is 2.5:1, which can meet the requirements of anti-adhesion and natural shedding at 80°C, but it breaks the coating limit of this emulsion and may cause storage instability.

[0049] Considering the anti-sticking performance and stability of the coating at 80°C, the present invention selects a pigment-to-base ratio of 2.1-2.2:1.

[0050] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A water-based one-component high-temperature anti-sticking solid color coating, characterized in that: The invention comprises the following raw materials in parts by weight: 22.5-23.5 parts of water-based acrylic emulsion, 0.18-0.22 parts of pH regulator, 0.3-0.7 parts of dispersant, 0.2-0.4 parts of defoamer, 0.2-0.4 parts of wetting and leveling agent, 3-7 parts of film-forming aid, 19-21.25 parts of water, 47-52 parts of pigments and fillers, 0.2-0.3 parts of thickener and 0.08-0.12 parts of preservative, wherein the mass ratio of the pigments and fillers to the water-based acrylic emulsion is 2.1-2.2:1; and the Tg of the water-based acrylic emulsion is 40°C < Tg < 43°C.

2. The water-based one-component high-temperature anti-sticking solid color coating according to claim 1, characterized in that: The color filler is a pigment and a filler; the weight ratio of the pigment to the filler is 1:2-2.

5.

3. The water-based one-component high-temperature anti-sticking solid color coating according to claim 2, characterized in that: The pigment is titanium dioxide; the filler is talc and calcium carbonate; the weight ratio of the talc to the calcium carbonate is 1:

1.

4. The water-based one-component high-temperature anti-sticking solid color coating according to claim 1, characterized in that: The film-forming aid is one or a combination of two or more of dipropylene glycol methyl ether, dipropylene glycol butyl ether, diethylene glycol butyl ether, and diethylene glycol ethyl ether.

5. The water-based one-component high-temperature anti-sticking solid color coating according to claim 1, characterized in that: The defoaming agent is one or a combination of two or more of BYK022, BYK024, BYK028, TEGO810, TEGO90W, TEGO902W, and TEGO845.

6. The water-based one-component high-temperature anti-sticking solid color coating according to claim 1, characterized in that: The wetting and leveling agent is one or a combination of two or more of BYK-346, TEGO410, BYK-333, BYK-3455, TEGO270, KL245, and TEGO4100.

7. A method for preparing a water-based one-component high-temperature anti-sticking solid color coating according to any one of claims 1 to 6, characterized in that: The following steps are involved: A water-based acrylic emulsion is mixed with a pH regulator and a dispersant, and the mixture is stirred and dispersed at a low speed to obtain a mixture A; a defoamer, a wetting and leveling agent, a film-forming aid and a portion of water are mixed evenly to obtain a mixture B; the mixture B is added to the mixture A, and the mixture is stirred and dispersed at a medium speed to obtain a mixture C; a pigment, a filler and a thickener and the remaining water are added to the mixture C, and the mixture is stirred and dispersed at a high speed, and finally a mildew inhibitor is added to obtain a water-based one-component high-temperature anti-rebound solid color coating.

8. The method for preparing the water-based one-component high-temperature anti-sticking solid color coating according to claim 7, characterized in that: The rotation speed of the low-speed stirring and dispersing is 500-600 r / min, and the stirring time is 5-10 min; the rotation speed of the medium-speed stirring and dispersing is 700-800 r / min, and the stirring time is 8-12 min; the rotation speed of the high-speed stirring and dispersing is 1200-1500 r / min, and the stirring time is 20-30 min.

9. The method for preparing the water-based one-component high-temperature anti-sticking solid color coating according to claim 7, characterized in that: The speed of adding the mixed material B to the mixed material A is 2-4 kg / min. The mixed material A is stirred while the mixed material B is added. The mixed material B is added from the center of the vortex of the mixed material A.

10. A water-based one-component high-temperature anti-sticking solid color coating according to any one of claims 1 to 6, used for protecting wood in a high-temperature environment.

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