Multifunctional coating for immortal moss and preparation method thereof

Abstract

The invention provides a multifunctional coating for immortal moss and a preparation method of the multifunctional coating, and the multifunctional coating is obtained by uniformly mixing a thickening agent, a defoaming agent, a mildew preventive, a wetting agent, a hand feeling aid, a dispersing agent, calcium carbonate and a flame retardant with waterborne polyurethane and deionized water. The invention further discloses application of the immortal moss multifunctional coating. When the coating prepared by the invention is used for dyeing moss, the immortal moss has good flame-retardant and mildew-proof properties, and the treatment process of the immortal moss is simplified.

Description

Technical Field

[0001] The present invention relates to the field of coatings, and particularly to a multifunctional coating for immortal moss and a preparation method thereof. Background Art

[0002] With the improvement of people's living standards, the concept of green and environmental protection in life has begun to occupy an important position, and indoor greening has come into people's view. Among them, moss plants are widely used in the creation of indoor landscapes due to their advantages such as activity, beauty, and strong plasticity. However, if not properly maintained, it will breed bacteria, fungi, etc., which will harm human health. Therefore, immortal moss with higher texture and richer colors has gradually occupied the market.

[0003] Immortal moss is obtained by processes such as impurity removal, dehydration, decolorization, dyeing, and drying. Generally, moss after dehydration and decolorization is soaked in glycerol to solve problems such as poor hand feeling, hardening, and brittleness. However, the surface of moss treated with glycerol is prone to moisture absorption, which will affect subsequent dyeing and lead to uneven dyeing. In addition, due to the extremely low water content in immortal moss, there are problems such as flammability. Chinese Patent CN113615684A discloses "a flame-retardant immortal moss and a preparation method thereof", in which moss is subjected to impurity removal, decolorization, dyeing, treatment with a treatment liquid, and drying to obtain flame-retardant immortal moss. However, the treatment with a treatment liquid containing a flame retardant is carried out after dyeing and drying, which not only complicates the process but also increases the time cost, and multiple soaking and other treatments may increase the damage to moss. In addition, immortal moss may also develop mildew and other phenomena due to improper storage and other problems. Therefore, the present invention provides a multifunctional coating for immortal moss and a preparation method thereof, realizing uniform dyeing of moss while enabling immortal moss to have good flame-retardant and mildew-proof properties. Summary of the Invention

[0004] Aiming at the above problems in the prior art, the technical problem to be solved by the present invention is to provide a multifunctional coating for immortal moss and a preparation method thereof, aiming to enable immortal moss to have good flame-retardant and mildew-proof properties while uniformly dyeing moss with the coating.

[0005] The technical solution of the present invention is as follows: A multifunctional coating for immortal moss and a preparation method thereof, the preparation method of the coating includes the following steps: Deionized water, flame retardant, mildewproof agent, feel aid and wetting agent are added to waterborne polyurethane, and the mixture is stirred at 200-300 r / min for 8-12 minutes. The pH of the mixture is adjusted to 8-9 with a pH regulator, and then calcium carbonate and dispersant are added. The mixture is stirred at 200-300 r / min for 8-12 minutes. Finally, a thickener and a defoaming agent are added, and the mixture is stirred at 200-300 r / min for 15-25 minutes to obtain a multifunctional coating for everlasting moss.

[0006] Preferably, the mass ratio of thickener, defoamer, mildewproofing agent, wetting agent, feel aid, dispersant, calcium carbonate, flame retardant, waterborne polyurethane and deionized water is 1: (0.3-0.7): (2-4): (4-6): (8-12): (5-10): (8-10) (20-25): (45-55): (70-80).

[0007] Preferably, the waterborne polyurethane is a nonionic waterborne polyurethane. More preferably, the nonionic waterborne polyurethane is one of FS-7 nonionic waterborne polyurethane produced by Anhui Feimiao Chemical Co., Ltd., AH-1704-1 nonionic waterborne polyurethane produced by Anhui Dawei Huatai New Materials Technology Co., Ltd., and PT-507F waterborne nonionic polyurethane produced by Shandong Huling New Materials Co., Ltd.

[0008] Preferably, the flame retardant is a compound of nano aluminum hydroxide and a water-soluble organic phosphorus flame retardant in a mass ratio of 1: (4-5). More preferably, the phosphorus flame retardant is one of the water-based flame retardant J5601 of Shenzhen Yoshida Chemical Co., Ltd., the water-soluble nitrogen-phosphorus fabric flame retardant of Changzhou Jinhudun New Material Technology Co., Ltd., and the water-based liquid flame retardant ZKXC-5009 of Shandong Zhongkangguo Innovation Materials Co., Ltd.

[0009] Preferably, the mildew inhibitor is one of polyethyleneimine (PEI), methylisothiazolinone (MIT), and casone (CIT / MIT).

[0010] Preferably, the hand feel aid is emulsified silicone oil. More preferably, the emulsified silicone oil is one of JF-3466 emulsified silicone oil from Jiashan Jiangnan Textile Materials Co., Ltd., MEM8031 amino silicone oil emulsion from Jinan Kain Chemical Technology Co., Ltd., and XLD-823 hydroxy silicone oil emulsion from Jinan Xinglongda Chemical Co., Ltd.

[0011] Preferably, the wetting agent is one of dodecyl polyoxyethylene ether and octyl polyoxyethylene ether; and the particle size of the calcium carbonate is 800-1000 mesh.

[0012] Preferably, the dispersant is AKN-2070 dispersant produced by Foshan Qianyou Chemical Co., Ltd.

[0013] Preferably, the thickener is a non-ionic polyurethane associative thickener, and is selected from one of RM-8W or RM-12W of Dow Chemical.

[0014] Preferably, the defoamer is a water-soluble defoamer. More preferably, the water-soluble defoamer is one of B-149, B-83, and B-146 of Guangdong Zhonglianbang Defoamer Factory.

[0015] Preferably, the pH regulator is 1 mol / L sodium hydroxide.

[0016] Another aspect of the present invention provides an application of the multifunctional coating for immortal moss: Dissolve the water-based metal complex dye in deionized water, then add the prepared multifunctional coating and mix, spray evenly on the surface of the decolorized moss, and bake at 10~30°C for 1~2 h and at 30~50°C for 4~6 h; the mass ratio of the multifunctional coating, deionized water, and water-based metal complex dye is 1:1:(0.2~1).

[0017] Preferably, there is no specific requirement for the color of the water-based metal complex dye.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: The multifunctional coating designed and prepared in the present invention has good and long-lasting mildew-proof effect and excellent flame-retardant performance, which can effectively prevent the spread of fire. After spraying it on the surface of moss, the immortal moss not only has uniform dyeing, but also realizes characteristics such as soft hand feeling, flame retardancy, and mildew prevention, simplifies the treatment process of immortal moss, shortens the overall treatment time, and is beneficial to avoiding damage to moss caused by multiple processes. Description of the Drawings

[0019] Figure 1 It is the flame-retardant test results of the immortal moss in Example 1, Comparative Example 1, and 4, where (a) group of immortal moss was not soaked in glycerol after dehydration, and (b) group of immortal moss was soaked in glycerol after dehydration; Figure 2 It is the test results of the antibacterial performance of the coating in Example 1 and Comparative Example 2, where (a) is the result on the second day and (b) is the result on the fifth day; Figure 3 It is the dyeing result of Example 1; Figure 4 It is the finished coating product of Example 1. Detailed Embodiments

[0020] The present invention is specifically described below by way of examples, which are only used to further illustrate the present invention and cannot be understood as limiting the scope of protection of the present invention. It should be understood that after reading the contents of the present invention, those skilled in the art may make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

[0021] Example 1 The preparation method of the multifunctional coating for immortal moss: 75 g of deionized water, 23 g of flame retardant (compounded by 10 g of nano aluminum hydroxide and 45 g of water-based flame retardant J5601 (Shenzhen Yoshida Chemical Co., Ltd.)), 3 g of mildew inhibitor (polyethyleneimine), 10 g of hand feel additive (JF-3466 emulsified silicone oil, Jiashan Jiangnan Textile Materials Co., Ltd.) and 5 g of wetting agent (dodecyl polyoxyethylene ether) were added to 50 g of non-ionic water-based polyurethane (FS-7 non-ionic water-based polyurethane, Anhui Feimiao Chemical Co., Ltd.) and stirred at 250 r / min. After 10 min, the pH of the mixture was adjusted to 8.5 with 1 mol / L sodium hydroxide, and then 8 g of dispersant (AKN-2070 dispersant, Foshan Qianyou Chemical Co., Ltd.) and 9 g of 900 mesh calcium carbonate were added. After stirring at 250 r / min for 10 min, 1 g of thickener (Yalesun RM-8W, Dow Chemical) and 0.5 g of defoamer (B-149, Guangdong Zhonglian Defoamer Factory) were finally added, and then stirred at 250 r / min for 20 min to obtain a multifunctional coating for everlasting moss.

[0022] Application method of the multifunctional coating prepared above: 2 g of water-based metal complex dye (Shanghai Wangchong Chemical Co., Ltd., KN-5200 green metal complex dye) was dissolved in 10 g of deionized water, and then 10 g of the prepared multifunctional coating was added and mixed, and evenly sprayed on the moss surface after decolorization, and baked at 20°C for 1.5 h and at 40°C for 5 h.

[0023] Example 2 The preparation method of the multifunctional coating for immortal moss: In 45 g of non-ionic aqueous polyurethane (AH-1704-1 non-ionic aqueous polyurethane, Anhui Dawei Huatai New Materials Technology Co., Ltd.), add 70 g of deionized water, 20 g of flame retardant (prepared by compounding 10 g of nano-aluminum hydroxide and 40 g of water-soluble nitrogen-phosphorus-based fabric flame retardant (Changzhou Jinhudun New Materials Technology Co., Ltd.)), 2 g of mildew preventive (methylisothiazolinone), 8 g of hand feeling agent (MEM8031 amino silicone oil emulsion, Jinan Kaiyin Chemical Technology Co., Ltd.) and 4 g of wetting agent (octyl polyethylene oxide ether). After stirring at 200 r / min for 8 min, adjust the pH of the mixture to 8 with 1 mol / L sodium hydroxide, then add 5 g of dispersant (AKN-2070 dispersant, Foshan Qianyou Chemical Co., Ltd.) and 8 g of 800-mesh calcium carbonate, stir at 200 r / min for 8 min, and finally add 1 g of thickener (ASE 60, Dow Chemical) and 0.3 g of defoamer (B-83, Guangdong Zhonglianbang Defoamer Factory), and stir at 200 r / min for 15 min to obtain a multifunctional coating for preserved moss.

[0024] Application method of the above-prepared multifunctional coating: Dissolve 5 g of water-based metal complex dye (Shanghai Wangchong Chemical Co., Ltd., KN-5200 green metal complex dye) in 10 g of deionized water, then add 10 g of the prepared multifunctional coating and mix, spray evenly on the surface of the decolorized moss, and bake at 10 °C for 1 h and at 30 °C for 4 h.

[0025] Example 3 The preparation method of the multifunctional coating for preserved moss: In 55 g of non-ionic aqueous polyurethane (PT-507F aqueous non-ionic polyurethane, Shandong Huling New Materials Co., Ltd.), add 80 g of deionized water, 25 g of flame retardant (prepared by compounding 10 g of nano-aluminum hydroxide and 50 g of water-based liquid flame retardant ZKXC-5009 (Shandong Zhongkangguo Innovation Materials Co., Ltd.)), 4 g of mildew preventive (Kathon), 12 g of hand feeling agent (XLD-823 hydroxy silicone oil emulsion, Jinan Xinglongda Chemical Co., Ltd.) and 6 g of wetting agent (dodecyl polyethylene oxide ether). After stirring at 300 r / min for 12 min, adjust the pH of the mixture to 9 with 1 mol / L sodium hydroxide, then add 10 g of dispersant (AKN-2070 dispersant, Foshan Qianyou Chemical Co., Ltd.) and 10 g of 1000-mesh calcium carbonate, stir at 300 r / min for 12 min, and finally add 1 g of thickener (RM-8W, Dow Chemical) and 0.7 g of defoamer (B-146, Guangdong Zhonglianbang Defoamer Factory), and stir at 300 r / min for 25 min to obtain a multifunctional coating for preserved moss.

[0026] Application method of the multifunctional coating prepared above: Dissolve 10 g of water-based metal complex dye (Shanghai Wangchong Chemical Co., Ltd., KN-5200 green metal complex dye) in 10 g of deionized water, then add 10 g of the prepared multifunctional coating and mix. Spray it evenly on the surface of the decolorized moss, and bake it at 30 °C for 2 h and at 50 °C for 6 h.

[0027] Comparative Example 1 During the preparation of the coating described, no flame retardant is added, and the remaining preparation steps and application method are the same as those in Example 1.

[0028] Comparative Example 2 During the preparation of the coating described, no mildew-proof agent is added, and the remaining preparation steps are the same as those in Example 1.

[0029] Application method of the multifunctional coating prepared above: Dissolve 2 g of water-based metal complex dye (Shanghai Yinsai Industry Co., Ltd., GN-02 green metal complex dye) in 10 g of deionized water, then add 10 g of the prepared multifunctional coating and mix. Spray it evenly on the surface of the decolorized moss, and bake it at 20 °C for 1.5 h and at 40 °C for 5 h.

[0030] Comparative Example 3 During the preparation of the coating described, no wetting agent and hand feel additive are added, and the remaining preparation steps and application method are the same as those in Example 1.

[0031] Comparative Example 4 During the preparation of the coating described, the flame retardant added is nano-aluminum hydroxide flame retardant, and the remaining preparation steps and application method are the same as those in Example 1.

[0032] Experimental method Pour the coatings prepared in the examples and comparative examples into a 20 mm × 130 mm × 3 mm standard mold, and let it dry naturally. During drying, if there are depressions in the film, the coating needs to be replenished. After natural drying, take it out and put it into a constant temperature and humidity chamber set at 23 °C ± 0.5 °C and humidity 50% ± 5% for 24 h to obtain a coating sample film for standby.

[0033] Test the examples and comparative examples. The test methods for flame retardancy, antibacterial property, dyeing uniformity, sensory evaluation, etc. are as follows: 1. Flame retardancy test: (1)Vertical combustion: Cut the coating films prepared in the examples and comparative examples into samples of 20 mm × 160 mm × 3 mm for standby. Use a horizontal and vertical combustion tester to test the vertical combustion grade of the coating films: Fix one end of the sample on the vertical fixture respectively, and expose the other end to the test flame. Evaluate the combustion behavior of the sample, and measure the linear combustion rate by measuring the remaining length of the sample after combustion and the afterflame time, so as to evaluate the flame retardant performance of the sample.

[0034] (2)Limiting oxygen index LOI (%): Put the coating sample films of the examples and comparative examples into the combustion cylinder, adjust the appropriate oxygen concentration, and start the test from an oxygen concentration of 21% (the oxygen concentration in the air is about 21% or so). Ignite for 12 s and observe whether it burns completely within 3 min. If it can burn completely, it is flammable; if it cannot burn completely, adjust the oxygen concentration appropriately. Finally, measure the limiting oxygen index of the sample. Make 3 groups of samples for each group of samples to reduce errors.

[0035] (3)Moss combustion experiment: Select the immortal moss squares sprayed with the coatings of the examples and comparative examples with similar sizes, and burn the surface of the moss with a spray gun for 5 s, and observe the combustion situation on the surface of the moss.

[0036] 2. Antibacterial performance test: (1)Inoculate Aspergillus flavus and Penicillium on the potato - dextrose - agar medium, and culture them in a biochemical incubator at 37 °C for 16 h. Pick single colonies respectively and suspend the colonies of the test strains with 0.9% sterile sodium chloride injection solution to prepare a bacterial suspension, and adjust the concentration of the diluted bacterial solution to 5×10 7 CFU / ml for standby. Cut the coating sample film into small round pieces with a diameter of 1 cm for standby.

[0037] (2)Take 50 μL of the diluted Aspergillus flavus and Penicillium bacterial solutions respectively, mix them evenly, and then mix them evenly with 20 ml of potato - dextrose - agar medium that has been autoclaved and not solidified and has a temperature of 40 - 45 °C, and pour them into a petri dish. After the petri dish solidifies, use sterile forceps to place the coating round piece samples parallel on the medium, and gently press the samples to make the samples fit tightly with the medium. Cover the petri dish and wait for it to solidify at room temperature. Place the above petri dishes in an incubator at 33 °C for 1 - 5 d, and observe whether an inhibition zone is generated; measure the diameter of the inhibition zone with the outer edge of the inhibition zone as the boundary and record it. The diameter of the inhibition zone = the diameter of the inhibition zone (including the coating sample) - the outer diameter of the coating sample. Another blank control group (pieces of the same size paper) is set up.

[0038] 3. Sensory evaluation test of dyeing uniformity and soft hand feeling: Observe the appearance of the immortal moss prepared by spraying the coatings of the examples and comparative examples, and observe the uniformity of the pigments; evaluate the hand feeling of the immortal moss prepared by the examples and comparative examples by touching.

[0039] The test results are shown in the appendix of the specificationFigures 1 - 4 , Tables 1~2.

[0040] Table 1 shows the vertical combustion results and limiting oxygen index test results of the coating films of the embodiments and comparative examples. By observing the data in the table, it can be seen that the limiting oxygen index of the coating films of embodiments 1 to 3 and comparative examples 2 to 4 is relatively high. Although there is a molten droplet phenomenon when these groups of films burn, the combustion phenomenon is not obvious and the absorbent cotton will not be ignited. All of them can reach V 0 Grade. The coating prepared in Comparative Example 1 does not add flame retardants, and not only has a low limiting oxygen index, but also immediately catches fire when a flame is applied in the combustion experiment, showing obvious combustion behavior accompanied by a large number of molten droplets, and also bends and deforms and ignites the absorbent cotton, which does not meet the UL-94 grade classification requirements. In addition, the limiting oxygen index of Comparative Example 4 is slightly lower than that of Examples 1 to 3, indicating that the flame retardant effect is not as good as that of Examples 1 to 3. This may be because when aluminum hydroxide is used alone as a flame retardant, it has poor compatibility with water-based polyurethane and the flame retardant is unevenly distributed. Therefore, the multifunctional coating prepared by the present invention has good flame retardant properties.

[0041] Table 1 Vertical combustion results and limiting oxygen index of coating films of examples and comparative examples Figure 1 The flame retardant test results of the immortal moss of Example 1, Comparative Examples 1 and 4 are shown. The immortal moss of group (a) was not soaked in glycerol after dehydration, and the immortal moss of group (b) was soaked in glycerol after dehydration. Figure 3 The experimental results show that the immortal moss soaked in propylene glycol is easier to burn, and this phenomenon is particularly obvious in the comparative example 1 that does not contain a flame retardant. During the experiment, once the immortal moss of the comparative example 1 in group (b) was ignited, the fire spread rapidly, and a large area of ​​charred black appeared. Compared with comparative example 1, the coating prepared in comparative example 4 has a certain flame retardant effect. The immortal mosses of groups (a) and (b) did not burn on a large scale, nor did they appear charred black. Furthermore, compared with the immortal moss of comparative example 4, the immortal moss of Example 1 has excellent flame retardant properties. Only small areas of burn marks appeared on the surface of the mosses of groups (a) and (b), and the fire did not spread during the combustion process. In summary, it can be seen that the multifunctional coating prepared by the present invention has an excellent flame retardant effect and can effectively prevent the spread of fire.

[0042] Figure 2Test results of the antibacterial properties of the coatings in Example 1 and Comparative Example 2. Among them, (a) shows the results on the second day. It can be seen that no inhibition zone was produced in the blank control group, indicating that it has no antibacterial property. The coating in Comparative Example 2 has weak antibacterial property, and a small antibacterial zone was formed around the film. Compared with Comparative Example 2, the coating prepared in Example 1 of the present invention has significant antibacterial property, and a large and clear inhibition zone was produced around the coating film. (b) shows the results on the fifth day. It can be seen that there is still an obvious inhibition zone around the coating film prepared in Example 1, while Comparative Example 2 and the blank control group have been covered by mildew, indicating that the coating prepared by the present invention has good and long-lasting antibacterial effect and higher practical value.

[0043] Figure 3 For the staining result of Example 1, by observing Figure 4 the color of the moss therein, it can be known that the surface of the moss sprayed with the coating prepared in Example 1 of the present invention is evenly stained without cracks and without caking phenomenon, and visually it is infinitely close to fresh moss, having high ornamental value.

[0044] Observing the sensory evaluation results in Table 2, the mosses coated with the coatings prepared in Examples 1 to 3 are evenly stained and have a soft and realistic touch. However, the surface color of Comparative Example 3 is mottled, reducing the visual ornamental value of the preserved moss, indicating that the wetting agent added to the coating prepared by the present invention is beneficial to providing the uniformity of staining. In addition, the hand feel aid in the coating makes the treated moss feel softer and closer to fresh moss. In addition, since the flame retardant added in Comparative Example 4 is an inorganic flame retardant, not only is it too hard after film formation, resulting in poor hand feel of the preserved moss, but also it has a certain impact on the staining uniformity.

[0045] Table 2 Antibacterial properties and sensory evaluations of the coatings in examples and comparative examples Figure 4 For the finished product of the coating in Example 1, it can be seen from the figure that the color of the prepared coating is white and there is no delamination phenomenon, indicating that the multifunctional coating prepared by the present invention has certain storage stability.

[0046] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent replacements or modifications made on the basis of the present invention to solve basically the same technical problems and achieve basically the same technical effects are all covered by the protection scope of the present invention.

Claims

1. A multifunctional coating for immortal moss and a preparation method thereof, characterized in that: The preparation method of the coating is as follows: deionized water, a flame retardant, a mildew preventer, a feel aid and a wetting agent are added to waterborne polyurethane, and the mixture is stirred at 200-300 r / min for 8-12 minutes, and the pH of the mixture is adjusted to 8-9 with a pH adjuster, and then calcium carbonate and a dispersant are added, and the mixture is stirred at 200-300 r / min for 8-12 minutes, and finally a thickener and a defoaming agent are added, and the mixture is stirred at 200-300 r / min for 15-25 minutes to obtain a multifunctional coating for everlasting moss.

2. The multifunctional coating for immortal moss and the preparation method thereof according to claim 1, characterized in that: The mass ratio of thickener, defoamer, mildewproof agent, wetting agent, feel aid, dispersant, calcium carbonate, flame retardant, water-based polyurethane and deionized water is 1: (0.3~0.7): (2~4): (4~6): (8~12): (5~10): (8~10): (20~25): (45~55): (70~80).

3. The multifunctional coating for immortal moss and the preparation method thereof according to claim 1, characterized in that: The waterborne polyurethane is a nonionic waterborne polyurethane.

4. The multifunctional coating for immortal moss and the preparation method thereof according to claim 1, characterized in that: The flame retardant is a compound of nano aluminum hydroxide and a water-soluble organic phosphorus flame retardant in a mass ratio of 1: (4-5); the mildew inhibitor is one of polyethyleneimine (PEI), methylisothiazolinone (MIT), and casone (CIT / MIT); and the hand feel aid is emulsified silicone oil.

5. The multifunctional coating for immortal moss and the preparation method thereof according to claim 1, characterized in that: The wetting agent is one of dodecyl polyoxyethylene ether and octyl polyoxyethylene ether, and the particle size of the calcium carbonate is 800-1000 meshes.

6. The multifunctional coating for immortal moss and the preparation method thereof according to claim 1, characterized in that: The thickener is a nonionic polyurethane associative thickener; and the defoamer is a water-soluble defoamer.

7. The multifunctional coating for immortal moss and the preparation method thereof according to claim 1, characterized in that: The pH regulator is 1 mol / L sodium hydroxide.

8. The use of a multifunctional coating for immortal moss according to claims 1 to 7, characterized in that: The water-based metal complex dye is dissolved in deionized water, then added into the prepared multifunctional coating and mixed, and evenly sprayed on the moss surface after bleaching treatment, and baked at 10-30°C for 1-2h and at 30-50°C for 4-6h; the mass ratio of the multifunctional coating, deionized water and water-based metal complex dye is 1:1:(0.2-1).

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