Bio-based water-based toy paint applied to degradable base material and preparation method of bio-based water-based toy paint

Abstract

The invention relates to the technical field of coatings, in particular to bio-based water-based toy paint applied to a degradable base material and a preparation method of the bio-based water-based toy paint. The water-based toy paint comprises varnish, wherein the varnish comprises the following components in percentage by mass: 60-80% of a film-forming main agent, 3-5% of a film-forming auxiliary agent, 0.2-0.5% of a wetting agent, 0.1-0.2% of a defoaming agent, 2-5% of wax emulsion, 0.5-2% of matting powder, 0.1-0.2% of a flatting agent, 0.5-1% of a thickening agent and the balance of purified water. The adhesive force on the surface of a degradable base material is excellent, the market vacancy of products of the same type is filled, and the industrial pain point is further solved.

Description

Technical Field

[0001] The invention relates to the technical field of coatings, and in particular to a bio-based water-based toy paint applied on a degradable substrate and a preparation method thereof. Background Art

[0002] At present, degradable materials include photodegradable materials, biodegradable materials, etc. Biodegradable materials refer to materials that are degraded by the respiration or chemosynthesis of natural microorganisms such as fungi and bacteria, and eventually decompose into carbon dioxide and water. As the global demand for improving the environment becomes stronger and stronger, the use of biodegradable plastics is considered to be the most effective solution to eradicate the "white pollution" of disposable plastics. The total amount of greenhouse gases emitted by bio-based biodegradable plastics throughout their life cycle is relatively low.

[0003] The ABS / PVC / PP / PC substrates of traditional plastic products are difficult to degrade. The main methods of dealing with used plastic waste (such as various packaging bags, toys, disposable lunch boxes, etc.) are incineration and landfill, which causes great pollution to the air and soil environment. In order to reduce the pollution caused by traditional plastic waste to the environment, the world has begun to limit plastics. The EU plans to ban restaurants from distributing tableware made of non-degradable materials or recycled plastics by 2025. At the same time, China has also issued a "plastic ban". Environmentally friendly biodegradable materials have become the preferred alternative to traditional plastic products. The industry has actively studied environmentally friendly biodegradable materials. For example, the catering industry has used environmentally friendly biodegradable tableware and given away toys made of biodegradable materials.

[0004] However, environmentally friendly biodegradable materials have the characteristics of poor solvent resistance, poor hydrolysis resistance, and poor wettability, which makes it difficult for water-based paint to adhere directly to their surface or the water content in toy paint causes defects in the substrate. Therefore, there is an urgent need to develop water-based toy paint products on environmentally friendly biodegradable substrates, and the market prospects are great. Summary of the invention

[0005] In view of this, the present invention provides a bio-based water-based toy paint applied on a degradable substrate and a preparation method thereof.

[0006] The technical solution of the present invention is: A bio-based water-based toy paint applied to a degradable substrate, characterized in that it includes a varnish, wherein the varnish includes the following components in percentage by mass: 60-80% of a film-forming main agent, 3-5% of a film-forming auxiliary agent, 0.2-0.5% of a wetting agent, 0.1-0.2% of a defoaming agent, 2-5% of a wax emulsion, 0.5-2% of a matting powder, 0.1-0.2% of a leveling agent, 0.5-1% of a thickener, and the balance is pure water.

[0007] The components of the present invention are: film-forming main agent: as the main base material for film formation, it determines the main functions of the paint film, such as hardness, gloss and weather resistance; film-forming auxiliary agent: helps the emulsion or dispersion particles to form a uniform and dense film after water evaporates, and improves the film-forming property under low temperature conditions; wetting agent: improves the wetting performance of the paint liquid on the substrate, improves the leveling property, and increases the adhesion of the paint film to the substrate; defoaming agent: inhibits the bubbles generated in the paint liquid during the production process and can make the generated bubbles escape from the liquid surface and break the bubbles to prevent coating defects; wax emulsion : Improve the waterproof performance of the coating, reduce water penetration, and protect the substrate; form a protective layer on the surface of the coating to improve the wear resistance and scratch resistance of the coating; adjust the gloss of the coating to meet different decorative needs; improve the surface feel of the coating, making it smoother and softer; leveling agent: improve the construction performance of the paint, form a flat and smooth coating, and improve the decorative effect of the coating; thickener: increase the viscosity of the paint liquid, increase the wet film thickness of one coating, and prevent precipitation and stratification of putty and solid color paint. Through the synergistic compounding of each component, it is ensured that the varnish of the water-based paint can form a uniform, high-quality and durable coating.

[0008] Furthermore, the film-forming main agent is one or a mixture of two or more of bio-based aliphatic polyurethane dispersion resin, bio-based vegetable oil modified polyurethane mixture, and bio-based self-crosslinking acrylic acid modified aliphatic polyurethane copolymer. The following products in the prior art can be used: Wanhua 6140, Oubaodi 6100, APU10140, AS2610.

[0009] In the present invention, the selection of the film-forming main agent is crucial to the performance of the final coating, wherein the bio-based aliphatic polyurethane dispersion resin is the main base material for film formation, which determines the main functions of the paint film, such as hardness, gloss and weather resistance. The aliphatic polyurethane dispersion resin has excellent weather resistance, wear resistance and chemical stability, and improves the biodegradability of the material; the bio-based vegetable oil modified polyurethane mixture is modified by the vegetable oil to improve the processing performance, water resistance and mechanical properties of the polyurethane. The vegetable oil modified polyurethane mixture combines the bio-based characteristics of the vegetable oil and the excellent performance of the polyurethane, which helps to reduce the overall cost of the coating and improve its environmental performance; the bio-based self-crosslinking acrylic acid modified aliphatic polyurethane copolymer is a self-crosslinking acrylic acid modified aliphatic polyurethane copolymer that enhances the adhesion, chemical resistance and water resistance of the coating by introducing acrylic acid groups. This copolymer can form a more dense and tough coating film and improve the overall performance of the coating. It can have a better performance improvement: the self-crosslinking structure enables the coating to form a network structure during the drying process, thereby improving the hardness, wear resistance and weather resistance of the coating.

[0010] The bio-based film-forming main agent of the present invention can not only provide performance comparable to that of traditional polyurethane coatings, but also bring significant advantages in terms of environmental protection and sustainability.

[0011] Furthermore, the film-forming aid is a mixture of two of ethylene glycol monobutyl ether, diethylene glycol butyl ether, dipropylene glycol monomethyl ether, and dipropylene glycol monobutyl ether.

[0012] In the present invention, film-forming aids play a vital role in water-based paints. They can promote the plastic flow and elastic deformation of latex particles, improve their aggregation properties, and promote the film formation of materials within a wide range of construction temperatures. Among them, ethylene glycol monobutyl ether is mainly used as a plasticizer to improve the flexibility and ductility of the paint, so that the coating film has good durability while maintaining gloss. Its lower volatility characteristics help to increase the solid content of the paint and reduce the harm of solvent volatilization to the environment. In addition, the addition of ethylene glycol monobutyl ether improves the weather resistance and chemical resistance of the product, and its lower volatility helps to reduce the impact on the environment.

[0013] As a plasticizer, butyl diglycol ether effectively improves the flexibility and ductility of the coating, so that the coating film has good durability while maintaining its gloss. Its low volatility helps to increase the solid content of the coating and reduce the harm of solvent volatilization to the environment; in addition, the addition of butyl diglycol ether improves the weather resistance and chemical resistance of the product, and its low volatility helps to reduce the impact on the environment.

[0014] Dipropylene glycol monomethyl ether can improve the fluidity of the coating, thereby improving the leveling performance of the paint film, and also has good film-forming properties and less odor; in addition, dipropylene glycol monomethyl ether has good solubility and stability, which can effectively improve the fluidity of the coating, thereby improving the leveling performance of the paint film, and also has good film-forming properties and less odor.

[0015] Dipropylene glycol monobutyl ether can improve the viscosity of water-based coating systems, especially multi-solvent systems. Thickeners have no effect at all. Dipropylene glycol monobutyl ether combined with neutralizers can greatly improve the viscosity of the coating, have good storage properties, and will not sag or bloom when diluted and sprayed. Dipropylene glycol monobutyl ether can also improve the defoaming properties of water-based coatings, which is helpful for defoaming in both production and construction. In addition, dipropylene glycol monobutyl ether has a high film-forming efficiency and a medium-slow volatilization rate, so it can be used in water-based coatings to give the paint film excellent performance.

[0016] The film-forming aid of the present invention acts on the film-forming process of the coating by lowering the minimum film-forming temperature of the water-based coating and improving the coating performance, thereby improving the overall performance of the coating.

[0017] In the present invention, the synergistic effect between the film-forming main agent and the film-forming auxiliary agent is crucial to the formation of high-quality and uniform coating films. The film-forming main agent is the basis of coating film formation and determines the basic structure and properties of the coating film, such as hardness, gloss and weather resistance. They are usually high molecular weight polymers that can form a continuous coating film after water volatilization. The film-forming auxiliary agent reduces the minimum film forming temperature (MFFT) of the water-based coating, promotes the plastic flow and elastic deformation of the latex particles, improves its aggregation performance, and promotes the material to form a film within a wide range of application temperatures. Its synergistic mechanism includes the following: 1. Reduce the minimum film forming temperature (MFFT): Film-forming aids can reduce the minimum film forming temperature of water-based coatings, allowing the coating to form a film smoothly at a lower temperature. This is very important for improving the construction performance and application range of the coating; 2. Promote the fusion of latex particles: Film-forming aids soften latex particles, making it easier for them to fuse with each other during the evaporation of water to form a continuous coating. This is crucial to improving the uniformity and density of the coating; 3. Improve coating performance: Film-forming aids can also improve the hardness, water resistance, chemical resistance and other properties of the coating. This is because the film-forming aids interact with the latex particles during the film-forming process, forming a tougher and denser coating structure.

[0018] Furthermore, the wetting agent is a polyether-modified polysiloxane copolymer, which reduces the surface tension of the liquid, so that the liquid can spread better on the solid surface and improve its permeability. The following products in the prior art can be used: Evonik Specialty Chemicals TEGO Twin270, TEDO Twin280' Dow Corning Dowsil dc-67.

[0019] Furthermore, the defoamer is a polyether siloxane copolymer. The polyether siloxane copolymer defoamer has the following effects: reducing surface tension: polyether siloxane copolymer can significantly reduce the surface tension of water, so that it can better wet the substrate with low surface energy; rapid defoaming and long foam suppression time: this defoamer can quickly eliminate foam and maintain the foam suppression effect for a long time; self-emulsification: polyether siloxane copolymer can spontaneously form dispersed micelles in water, evenly dispersed in the foaming liquid, and give full play to the defoaming and foam suppression effects; high temperature resistance and strong alkali resistance: polyether siloxane copolymer has good chemical stability, can maintain performance under high temperature and strong alkali conditions, and is suitable for harsh environments. The following products in the prior art can be used: Evonik TEGO825, TEGO Airex902w / 904w.

[0020] Furthermore, the leveling agent is a polyether siloxane copolymer silicone, which improves the leveling of the coating by reducing surface tension, adjusting solvent evaporation rate, promoting coating leveling, enhancing coating fluidity and controlling coating viscosity, so as to promote the coating to form a flat, smooth and uniform coating film during the drying and film-forming process. The following products in the prior art can be used: Evonik Specialty Chemicals TEGO Glide410, BYK Chemicals BYK333, 310.

[0021] Furthermore, the thickener is a water-based polyurethane thickener, which increases the consistency of the coating by forming a three-dimensional network structure, thereby improving the construction performance and coating effect. The following products in the prior art can be used: Deqian Hemmings RHEOLATE 299 water-based polyurethane thickener, BYK Chemical BYK420, BYK425.

[0022] Furthermore, the wax emulsion is a high-density polyethylene wax emulsion or an anionic paraffin emulsion.

[0023] In the present invention, the high-density polyethylene wax emulsion has the following effects: improving wear resistance: the high-density polyethylene wax emulsion can significantly improve the wear resistance of the coating, make the paint film smoother, and reduce the friction coefficient; enhancing scratch resistance: by forming a protective film, the wax emulsion can effectively resist scratches and protect the coating from damage; improving hand feel: making the coating surface softer and smoother, and improving the hand feel of the product; adjusting gloss: adjusting the gloss of the coating according to needs to make it softer or brighter; providing waterproofness and rust resistance: by forming a hydrophobic film, it effectively prevents moisture and oxygen from invading, and extends the service life of the product.

[0024] Anionic paraffin emulsion has the following functions: Reduce surface tension: As a high-efficiency surface hydrophobic agent, anionic paraffin emulsion can significantly reduce the surface tension of the coating and improve its waterproof performance; Improve water resistance and anti-fouling properties: During the drying process of the coating, it migrates to the surface to form a protective layer, providing a good water-splashing effect; Increase gloss and water resistance: It can increase gloss and water resistance, and improve the feel and polishing properties.

[0025] The following prior art products can be used: Shandong Yijiu TL-2011N / TL-2011N-1 water-based wax emulsion.

[0026] Furthermore, the matting powder is a spherical acrylic powder with hydroxymethyl, which can reduce the gloss of the coating film to achieve a matting effect, while improving the hardness and flexibility of the coating.

[0027] Furthermore, it also includes colorant, and the mass ratio of the varnish to the colorant is: varnish:colorant=100:10-30.

[0028] Furthermore, the colorant is at least one of color paste, silver powder, pearl powder and fluorescent powder, and is mainly used for adjusting colors to produce different color effects.

[0029] Furthermore, the color paste includes the following components calculated by mass percentage: 15-20% wetting dispersant, 3-5% propylene glycol, 15-30% colorant, and the balance is pure water; the colorant is spherical polyurethane colored microbeads. In the present invention, the spherical polyurethane colored microbeads have excellent dispersibility and high hiding power, which can ensure uniform and bright coating; enhance wear resistance and weather resistance, and extend service life; have good environmental performance and meet green coating standards; are easy to process and control, can reduce costs and improve production efficiency; and can also create unique visual effects.

[0030] Particularly, the degradable substrate described in the present invention includes PLA (polylactic acid), PHA (polyhydroxyalkanoate), PBS (polybutylene succinate), and PBAT (polybutylene adipate / terephthalate) in the prior art.

[0031] In the present invention, by selecting bio-based film-forming substances and matching them with additives that have good compatibility with the bio-based film-forming substances, a bio-based water-based toy paint is prepared on a degradable substrate. According to the principle of similar compatibility, the paint has excellent adhesion on the surface of the degradable substrate, filling the market gap for similar products and further solving the pain points of the industry.

[0032] A method for preparing a bio-based water-based toy paint applied to a degradable substrate comprises the following steps: S1. The film-forming agent and the film-forming aid are sequentially put into the dispersion cylinder, and the defoamer and the wetting agent are added in order, and the mixture is stirred and dispersed at a speed of 600 to 800 r / min for 10 to 30 min; S2. Then slowly add the colorant and matting powder; then add the thickener to increase the viscosity, stir and disperse at a speed of 1000-1500r / min for 20-60min, so that the fineness is ≤25um and there is no shrinkage cavity; S3. Mix the above mixture with pure water, slowly add it into a dispersion tank while stirring at a speed of 600-800 r / min, then add wax emulsion and leveling agent in sequence, use a thickener to adjust the viscosity to a suitable state and stir evenly to obtain a bio-based water-based toy paint for use on a degradable substrate.

[0033] The beneficial effects of the present invention are: The bio-based water-based toy paint of the present invention can not only meet the environmental protection limit requirements of water-based toy paint for heavy metals, polycyclic aromatic hydrocarbons, and phthalates, but also has good color development and moisture and heat resistance. The color can be adjusted according to the needs of the situation. Under the appropriate construction viscosity, it can be directly sprayed on a degradable substrate, and can also be sprayed on toy substrates such as ABS, PC, PVC, etc., and can be sprayed once or multiple times.

[0034] The bio-based water-based toy paint of the present invention has color appearance, feel, physical and chemical properties and other performance requirements, and fully meets the physical and chemical properties and environmental protection requirements of toys.

[0035] It greatly improves production efficiency and reduces manufacturing costs. It eliminates various concerns about using water-based paint on water-based toys due to low production efficiency. It has a great driving effect on promoting the spraying of bio-based water-based paint on degradable substrates in water-based toy paint, greatly improving environmental protection. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described in detail below in conjunction with specific implementation methods. It should be understood that the specific implementation methods described here are only used to explain the present invention and do not limit the scope of protection of the present invention.

[0037] Table 1 below is a formula table of the varnish of the water-based toy paint on the degradable substrate of the present invention. As shown in Table 1, the preparation method is to stir and mix the raw materials evenly; wherein, the film-forming substance and film-forming aid combination of varnish A, varnish B, and varnish C are respectively bio-based aliphatic polyurethane dispersion resin + mixture of ethylene glycol monobutyl ether and dipropylene glycol monomethyl ether, bio-based vegetable oil modified polyurethane mixture + mixture of diethylene glycol monobutyl ether and dipropylene glycol monobutyl ether, and bio-based self-crosslinking acrylic acid modified aliphatic polyurethane copolymer + mixture of ethylene glycol monobutyl ether and diethylene glycol monobutyl ether; specifically, varnish A, varnish B, varnish C The film-forming substance and film-forming aid combinations of Paint C are, in order, polycaprolactone modified aliphatic polyurethane dispersion + a mixture of ethylene glycol monobutyl ether and dipropylene glycol monomethyl ether, a linseed oil modified polyurethane mixture + a mixture of diethylene glycol monobutyl ether and dipropylene glycol monobutyl ether, and a methyl methacrylate-butadiene-styrene copolymer modified aliphatic polyurethane + a mixture of ethylene glycol monobutyl ether and diethylene glycol monobutyl ether. The film-forming substance and film-forming aid combinations of Varnish E, Varnish F, and Varnish G are based on the prior art, which are, in order, water-based acrylic resin and alcohol ester twelve, polyurethane resin and dipropylene glycol monomethyl ether, and alkyd resin and propylene glycol phenyl ether. Among them, the wetting agent is a polyether modified polysiloxane copolymer; the defoaming agent is a polyether siloxane copolymer; the leveling agent is a polyether siloxane copolymer silicone; the thickener is a water-based polyurethane thickener, and the matting powder is a spherical acrylic powder with hydroxymethyl; the wax emulsion of varnish A, C, and E is a high-density polyethylene wax emulsion, and the wax emulsion of varnish B, D, and F is an anionic paraffin emulsion.

[0038] Table 1

[0039] Table 2 below is a formula table of the water-based toy paint color paste on the degradable substrate of the present invention. As shown in Table 2, the color powder is spherical polyurethane colored microbeads, and the preparation method is to stir and mix the raw materials evenly; Table 2

[0040] Table 3 below shows Examples 1-6 of the water-based toy paint on a degradable substrate according to the present invention. The specific formula is shown in Table 3, and the preparation method of Example 7 is used for mixing; Table 3 Example

[0041] A method for preparing a bio-based water-based toy paint applied to a degradable substrate comprises the following steps: S1. The film-forming agent and the film-forming aid are sequentially put into the dispersion cylinder, and the defoamer and the wetting agent are added in order, and the mixture is stirred and dispersed at a speed of 700 r / min for 20 min; S2. Then slowly add the colorant and matting powder; then add the thickener to increase the viscosity, stir and disperse at a speed of 1200r / min for 45min, so that the fineness is ≤25um and there is no shrinkage cavity; S3. Mix the above mixture with pure water, slowly add it into a dispersion tank while stirring at a speed of 700r / min, then add wax emulsion and leveling agent in sequence, use a thickener to adjust the viscosity to a suitable state and stir evenly to obtain a bio-based water-based toy paint for use on a degradable substrate. Example

[0042] A method for preparing a bio-based water-based toy paint applied to a degradable substrate comprises the following steps: S1. The film-forming agent and the film-forming aid are sequentially put into the dispersion cylinder, and the defoamer and the wetting agent are added in order, and the mixture is stirred and dispersed at a speed of 600 r / min for 25 min; S2. Then slowly add the colorant and matting powder; then add the thickener to increase the viscosity, stir and disperse at a speed of 1000r / min for 55min, so that the fineness is ≤25um and there is no shrinkage cavity; S3. Mix the above mixture with pure water, slowly add it into a dispersion tank while stirring at a speed of 600r / min, then add wax emulsion and leveling agent in sequence, use a thickener to adjust the viscosity to a suitable state and stir evenly to obtain a bio-based water-based toy paint for use on a degradable substrate. Example

[0043] A method for preparing a bio-based water-based toy paint applied to a degradable substrate comprises the following steps: S1. The film-forming agent and the film-forming aid are sequentially put into the dispersion cylinder, and the defoamer and the wetting agent are added in order, and the mixture is stirred and dispersed at a speed of 800 r / min for 15 min; S2. Then slowly add the colorant and matting powder; then add the thickener to increase the viscosity, stir and disperse at a speed of 1500r / min for 25min, so that the fineness is ≤25um and there is no shrinkage cavity; S3. Mix the above mixture with pure water, slowly add it into a dispersion tank while stirring at a speed of 800r / min, then add wax emulsion and leveling agent in sequence, use a thickener to adjust the viscosity to a suitable state and stir evenly to obtain a bio-based water-based toy paint for use on a degradable substrate.

[0044] Performance Testing The raw materials of the above-mentioned Examples 1-6 are weighed, mixed evenly in a conventional manner, and then sprayed on a degradable substrate (PLA) with a 1.0-1.3MM caliber spray gun. After the paint film of the present invention is dried, the paint film has different colors and textures, and can be sprayed once or multiple times; the product testing and technical indicators of the product are shown in the following Table 4; Table 4

[0045] The raw materials of Example 2 are weighed and prepared, and after being mixed uniformly in a conventional manner, they are sprayed on different types of degradable substrates (PLA, PHA, PBS) and conventional substrates (non-degradable plastics, wood, metal) with a 1.0-1.3MM caliber spray gun. After the paint film of the present invention is dried, the paint film has different colors and textures, and is sprayed once or multiple times; the product testing and technical indicators of the product are shown in Table 5 below; Table 5

[0046] The above results show that the bio-based water-based toy paint sprayed on the degradable substrate of the present invention can not only meet the environmental protection limit requirements of water-based toy paint for heavy metals, polycyclic aromatic hydrocarbons, and phthalates, but also has good adhesion and can meet the basic performance of toy paint.

[0047] The color can be adjusted according to the needs of the situation. At the appropriate construction viscosity (such as 40-60 seconds, coating No. 4 cup), it can be directly sprayed on the degradable substrate, basically meeting the physical and chemical properties and environmental protection requirements of toy paint.

[0048] Since the base material is a degradable material, when used with water-based bio-based toy paint, the prepared toy products can have good degradation function. Not only can the water-based paint be degraded, but the toy itself can also be degraded under certain conditions, greatly improving the environmental performance.

[0049] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0050] In addition, it should be understood that although this specification is described in accordance with the implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should take the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art. It should be noted that the technical features not described in detail in the present invention can be realized by any prior art in the art.

Claims

1. A bio-based water-based toy paint applied to a degradable substrate, characterized in that: The varnish comprises the following components in percentage by mass: 60-80% of a main film-forming agent, 3-5% of a film-forming auxiliary agent, 0.2-0.5% of a wetting agent, 0.1-0.2% of a defoaming agent, 2-5% of a wax emulsion, 0.5-2% of a matting powder, 0.1-0.2% of a leveling agent, 0.5-1% of a thickener, and the balance is pure water.

2. The bio-based water-based toy paint applied to a degradable substrate according to claim 1, characterized in that: The main film-forming agent is one or a mixture of two or more of a bio-based aliphatic polyurethane dispersion resin, a bio-based vegetable oil modified polyurethane mixture, and a bio-based self-crosslinking acrylic acid modified aliphatic polyurethane copolymer.

3. The bio-based water-based toy paint applied to a degradable substrate according to claim 1, characterized in that: The film-forming aid is a mixture of two of ethylene glycol monobutyl ether, diethylene glycol butyl ether, dipropylene glycol monomethyl ether and dipropylene glycol monobutyl ether.

4. The bio-based water-based toy paint applied to a degradable substrate according to claim 1, characterized in that: The wetting agent is a polyether-modified polysiloxane copolymer; the defoaming agent is a polyether siloxane copolymer; the leveling agent is a polyether siloxane copolymer silicone; and the thickener is a water-based polyurethane thickener.

5. The bio-based water-based toy paint applied to a degradable substrate according to claim 1, characterized in that: The wax emulsion is a high-density polyethylene wax emulsion or an anionic paraffin wax emulsion.

6. The bio-based water-based toy paint applied to a degradable substrate according to claim 1, characterized in that: The matting powder is acrylic spherical powder having hydroxymethyl groups.

7. The bio-based water-based toy paint applied to a degradable substrate according to claim 1, characterized in that: It also includes colorant, and the mass ratio of the varnish to the colorant is: varnish:colorant=100:10-30.

8. The bio-based water-based toy paint applied to a degradable substrate according to claim 7, characterized in that: The colorant is at least one of color paste, silver powder, pearl powder and fluorescent powder.

9. The bio-based water-based toy paint applied to a degradable substrate according to claim 8, characterized in that: The color paste comprises the following components calculated by mass percentage: 15-20% of a wetting and dispersing agent, 3-5% of propylene glycol, 15-30% of a color powder, and the balance is pure water; the color powder is spherical polyurethane colored micro beads.

10. A method for preparing a bio-based water-based toy paint applied to a degradable substrate according to any one of claims 1 to 9, characterized in that: The steps include: S1. The film-forming agent and the film-forming aid are sequentially put into the dispersion cylinder, and the defoamer and the wetting agent are added in order, and the mixture is stirred and dispersed at a speed of 600 to 800 r / min for 10 to 30 min; S2. Then slowly add the colorant and matting powder; then add the thickener to increase the viscosity, stir and disperse at a speed of 1000-1500r / min for 20-60min, so that the fineness is ≤25um and there is no shrinkage cavity; S3. Mix the above mixture with pure water, slowly add it into a dispersion tank while stirring at a speed of 600-800 r / min, then add wax emulsion and leveling agent in sequence, use a thickener to adjust the viscosity to a suitable state and stir evenly to obtain a bio-based water-based toy paint for use on a degradable substrate.

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