High biodegradability environmental protection gold onion powder

Abstract

The present application relates to the technical field of gold powder, in particular to an environmentally-friendly gold powder with high biodegradation rate, which is composed of a biodegradable base film and a functional plating layer; the base material comprises, by mass percentage, 30-45 parts of polylactic acid (PLA), 20-30 parts of polybutylene adipate terephthalate (PBAT), 10-15 parts of degradable polyester polyol, 5-8 parts of plasticizer (tributyl citrate), 0.3-0.8 parts of opening agent (silicon dioxide), 3-6 parts of biodegradation promoter (starch ester), and 0.2-0.5 parts of hydrolysis-resistant stabilizer; the biodegradation rate of the present application is ≥65.7% in 60 days, and the product can be safely exported to the United States, Europe and Australia by meeting the requirements of OECD301B, EU2023 / 2055 and REACH regulations; the base is a completely biodegradable polymer, free of PET, PVC, fluorescent whitening agent and heavy metals, and meets the global environmental protection ban.

Description

Technical Field

[0001] This invention relates to the field of glitter powder technology, specifically to environmentally friendly glitter powder with high biodegradability. Background Technology

[0002] Traditional glitter powder (shimmering powder) is mostly made from non-degradable plastics such as PET and PVC through coating and cutting. It is difficult to decompose in the natural environment, and long-term accumulation causes microplastic pollution, leading to restrictions on its use in the EU, US, and other regions. Existing biodegradable glitter powders generally face the following technical bottlenecks:

[0003] Low biodegradability rate makes it difficult to meet standards: Most biodegradable glitter has a biodegradability rate of only 30% to 50% after 60 days, which cannot meet the mandatory requirement of ≥60% biodegradability rate in EU 2023 / 2055, REACH regulations and OECD 301B standards, thus restricting exports.

[0004] Degradation conflicts with appearance performance: Improving degradation performance will lead to a significant decrease in brightness, gloss, and metallic feel, which cannot meet the requirements of high-end applications such as cosmetics, gifts, printing, textiles, and decorative coatings.

[0005] Unreasonable component ratio and poor stability: The base material is brittle and has poor water resistance. It is prone to moisture absorption and brittleness during storage. It is also prone to agglomeration and delamination in coating, ink and adhesive systems, which limits its application scenarios.

[0006] Poor process adaptability: Traditional cutting and crushing processes are difficult to produce uniform thin flakes with wide particle size distribution, rough edges, and poor gloss consistency, making it impossible to achieve stable industrial production. Therefore, a high biodegradability environmentally friendly glitter powder is proposed. Summary of the Invention

[0007] In view of this, the present invention provides environmentally friendly glitter powder with high biodegradability to solve or alleviate the technical problems existing in the prior art, and at least provides a beneficial alternative.

[0008] The technical solution of the present invention is achieved as follows: a high biodegradability environmentally friendly glitter powder, comprising a biodegradable base film and a functional coating;

[0009] By weight percentage, the base material includes: 30-45 parts polylactic acid (PLA), 20-30 parts polybutylene adipate / terephthalate (PBAT), 10-15 parts biodegradable polyester polyol, 5-8 parts plasticizer (tributyl citrate), 0.3-0.8 parts opening agent (silica), 3-6 parts biodegradation promoter (starch ester), and 0.2-0.5 parts hydrolysis stabilizer;

[0010] The coating structure is as follows: aluminum reflective layer (15~30nm), silicon dioxide protective layer (20~40nm), biodegradable fluorocarbon protective layer (5~10nm), and the final glitter powder particle size is 0.1~3mm, and the thickness is 20~50μm;

[0011] The biodegradability rate is ≥65.7% in 60 days, meeting the OECD 301B and EU 2023 / 2055 standards.

[0012] Further preferred, the biodegradation promoter is esterified starch, which can improve the microbial attachment efficiency and increase the degradation rate from 52% to over 65.7% in 60 days.

[0013] A further preferred option is a coating consisting of aluminum, silicon dioxide, and a biodegradable coating, which balances high gloss and biodegradability, and has no non-biodegradable coating.

[0014] Further preferred, the biodegradability rate is 65.7% after 60 days, which meets the requirements of OECD 301B, EU 2023 / 2055, and Annex XVII, Item 78 of REACH.

[0015] A method for preparing highly biodegradable and environmentally friendly glitter powder includes the following steps:

[0016] Step 1: Raw material drying: Vacuum dry PLA and PBAT at 75-85℃ for 3.5-5 hours, controlling the moisture content to ≤0.02%;

[0017] Step 2: Blending modification: Add the dried resin, polyester polyol, plasticizer, opening agent, biodegradation accelerator, and anti-hydrolysis stabilizer to a high-speed mixer in proportion and mix at 600-1000 r / min for 10-20 min;

[0018] Step 3: Twin-screw melt extrusion: using a gradient temperature of 145-175℃ and a screw speed of 150-220 r / min for plasticizing and melting;

[0019] Step 4: Casting film: Cooling roller temperature 30-45℃, to obtain a base film with a thickness of 20-50μm and a surface roughness Ra≤0.05μm;

[0020] Step 5: Biaxial stretching: longitudinal stretching 3.0 to 3.8 times, transverse stretching 2.5 to 3.5 times, stretching at 65 to 85°C, heat setting at 140 to 155°C;

[0021] Step 6: Vacuum coating: Vacuum degree ≤5×10⁻³Pa, aluminum layer evaporated, silicon dioxide layer deposited, and biodegradable protective layer coated in sequence;

[0022] Step 7: Precision slitting and ultra-fine cutting: Slitting width 0.1-1mm, ultra-fine cutting to form flake-shaped glitter;

[0023] Step 8: Air separation and dust removal to remove dust and unqualified particles;

[0024] Step 9: After passing the performance test, the product is packaged to obtain a high-biodegradability environmentally friendly glitter powder.

[0025] More preferably, the roughness Ra of the cast film is ≤0.05μm to ensure a mirror-like gloss.

[0026] More preferably, the adhesion of the film layer after vacuum coating is ≥4B, and it does not dealuminize or oxidize.

[0027] The embodiments of the present invention have the following advantages due to the adoption of the above technical solutions:

[0028] I. This invention has a 60-day biodegradability rate of ≥65.7%, meets the requirements of OECD 301B, EU 2023 / 2055, and REACH regulations, and can be safely exported to the United States, Europe, and Australia. The base is a fully biodegradable polymer, free of PET, PVC, fluorescent whitening agents, and heavy metals, and complies with global environmental bans.

[0029] II. The surface vacuum coating + high flatness film formation process of this invention has strong metallic luster and high mirror reflectivity. It can be used in high-end fields such as cosmetics, nail art, textile printing, Christmas gifts, and decorative coatings. It does not agglomerate, separate, or settle in water-based and oil-based systems, and its weather resistance and water resistance are improved, making it widely applicable.

[0030] Third, the process of this invention can adopt an integrated process of casting, biaxial stretching, vacuum coating and ultra-fine cutting, which is suitable for large-scale and low-cost manufacturing. It can replace traditional plastic glitter powder and be used in industries with strict regulations such as children's toys, nail art, cosmetics, packaging, textiles and decorative coatings.

[0031] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the invention will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a flowchart of the preparation method of the present invention. Detailed Implementation

[0034] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0035] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0036] Example 1

[0037] like Figure 1 As shown, embodiments of the present invention provide environmentally friendly glitter powder with high biodegradability, comprising a biodegradable base film and a functional coating.

[0038] By weight percentage, the base material includes: 30-45 parts polylactic acid (PLA), 20-30 parts polybutylene adipate / terephthalate (PBAT), 10-15 parts biodegradable polyester polyol, 5-8 parts plasticizer (tributyl citrate), 0.3-0.8 parts opening agent (silica), 3-6 parts biodegradation promoter (starch ester), and 0.2-0.5 parts hydrolysis stabilizer;

[0039] The coating structure is as follows: aluminum reflective layer (15~30nm), silicon dioxide protective layer (20~40nm), biodegradable fluorocarbon protective layer (5~10nm), and the final glitter powder particle size is 0.1~3mm, and the thickness is 20~50μm;

[0040] The biodegradability rate is ≥65.7% in 60 days, meeting the OECD 301B and EU 2023 / 2055 standards.

[0041] In one embodiment, the biodegradation promoter is esterified starch, which can improve the efficiency of microbial attachment and increase the degradation rate in 60 days from 52% to over 65.7%.

[0042] In one embodiment, the coating is aluminum + silicon dioxide + biodegradable coating, which combines high gloss and biodegradability, and has no non-biodegradable coating.

[0043] In one embodiment, the biodegradability rate is 65.7% after 60 days, which complies with the requirements of OECD 301B, EU 2023 / 2055, and Annex XVII, Paragraph 78 of REACH.

[0044] A method for preparing highly biodegradable and environmentally friendly glitter powder includes the following steps:

[0045] Step 1: Raw material drying: Vacuum dry PLA and PBAT at 75-85℃ for 3.5-5 hours, controlling the moisture content to ≤0.02%;

[0046] Step 2: Blending modification: Add the dried resin, polyester polyol, plasticizer, opening agent, biodegradation accelerator, and anti-hydrolysis stabilizer to a high-speed mixer in proportion and mix at 600-1000 r / min for 10-20 min;

[0047] Step 3: Twin-screw melt extrusion: using a gradient temperature of 145-175℃ and a screw speed of 150-220 r / min for plasticizing and melting;

[0048] Step 4: Casting film: Cooling roller temperature 30-45℃, to obtain a base film with a thickness of 20-50μm and a surface roughness Ra≤0.05μm;

[0049] Step 5: Biaxial stretching: longitudinal stretching 3.0 to 3.8 times, transverse stretching 2.5 to 3.5 times, stretching at 65 to 85°C, heat setting at 140 to 155°C;

[0050] Step 6: Vacuum coating: Vacuum degree ≤5×10⁻³Pa, aluminum layer evaporated, silicon dioxide layer deposited, and biodegradable protective layer coated in sequence;

[0051] Step 7: Precision slitting and ultra-fine cutting: Slitting width 0.1-1mm, ultra-fine cutting to form flake-shaped glitter;

[0052] Step 8: Air separation and dust removal to remove dust and unqualified particles;

[0053] Step 9: After passing the performance test, the product is packaged to obtain a high-biodegradability environmentally friendly glitter powder.

[0054] In one embodiment, the roughness Ra of the cast film is ≤0.05μm to ensure a mirror-like finish.

[0055] In one embodiment, the adhesion of the film layer after vacuum coating is ≥4B, and there is no aluminum removal or oxidation.

[0056] Example 2

[0057] Formula (parts by weight)

[0058] Polylactic acid (PLA): 40 parts, PBAT: 25 parts, biodegradable polyester polyol: 12 parts, tributyl citrate: 6 parts, nano silica: 0.5 parts, esterified starch (biodegradation promoter): 5 parts, anti-hydrolysis stabilizer: 0.4 parts;

[0059] Process Flow

[0060] Raw material drying: PLA and PBAT were dried at 80℃ for 4 hours;

[0061] Blending modification: Mix for 12 minutes to improve compatibility and toughness;

[0062] Melt extrusion casting: Low-temperature extrusion below 170℃, casting film thickness 35μm;

[0063] Biaxial stretching: 3.5 times in the longitudinal direction and 3.0 times in the transverse direction, set at 150℃;

[0064] Vacuum coating: 25nm aluminum layer + 30nm SiO2 protective layer + biodegradable coating;

[0065] Slit into 0.3mm x 0.3mm square glitter powder;

[0066] Air separation and grading: removes dust and ensures flowability;

[0067] Packaging and testing: Products that pass the biodegradability test are shipped out of the factory.

[0068] Table 1 Biodegradability (OECD301B, CO2 release method)

[0069] Testing items Test methods result Judgment criteria in conclusion 60-day biodegradation rate OECD 301B / EU 2023 / 2055 65.70% ≥60% pass Parallel sample deviation — 3.40% ＜20% pass Program-controlled degradation rate — 87.00% ≥60% Test valid Toxicity control degradation rate — 64.60% ＞25% Non-toxic

[0070] Table 2. Percentage of biodegradation at different times (%)

[0071] Time (d) Test Sample 1 Test Sample 2 average value 3 4.5 3.8 4.1 6 9.3 7.8 8.5 14 34.9 18.5 26.7 28 54.5 54.5 54.5 42 60.3 61.3 60.8 56 62.9 65.9 64.4 60 64 67.4 65.7

[0072] Table 3 Product Physical Properties

[0073] project index Appearance High-gloss flakes, dust-free Particle size 0.1~1mm thickness 20~50μm gloss ≥90GU Adhesion ≥4B Biodegradation rate (60d) 65.70% Applicable Standards EU2023 / 2055, REACH, OECD301B

[0074] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in the present invention, and these should all be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. High biodegradability environmentally friendly glitter powder, characterized by: It consists of a biodegradable base film and a functional coating; By weight percentage, the base material includes: 30-45 parts polylactic acid (PLA), 20-30 parts polybutylene adipate / terephthalate (PBAT), 10-15 parts biodegradable polyester polyol, 5-8 parts plasticizer (tributyl citrate), 0.3-0.8 parts opening agent (silica), 3-6 parts biodegradation promoter (starch ester), and 0.2-0.5 parts hydrolysis stabilizer; The coating structure is as follows: aluminum reflective layer (15~30nm), silicon dioxide protective layer (20~40nm), biodegradable fluorocarbon protective layer (5~10nm), and the final glitter powder particle size is 0.1~3mm, and the thickness is 20~50μm; The biodegradability rate is ≥65.7% in 60 days, meeting the OECD 301B and EU 2023 / 2055 standards.

2. The environmentally friendly glitter powder with high biodegradability according to claim 1, characterized in that: The biodegradation promoter is esterified starch, which can improve the efficiency of microbial attachment and increase the degradation rate from 52% to over 65.7% in 60 days.

3. The environmentally friendly glitter powder with high biodegradability according to claim 1, characterized in that: The coating consists of aluminum, silicon dioxide, and a biodegradable coating, balancing high gloss with biodegradability, and contains no non-biodegradable coating.

4. The environmentally friendly glitter powder with high biodegradability according to claim 1, characterized in that: The biodegradability rate is 65.7% after 60 days, which meets the requirements of OECD 301B, EU 2023 / 2055, and Annex XVII, Item 78 of REACH.

5. A method for preparing high biodegradability environmentally friendly glitter powder, used in conjunction with the high biodegradability environmentally friendly glitter powder as described in any one of claims 1-4, characterized in that: Includes the following steps: Step 1: Raw material drying: Vacuum dry PLA and PBAT at 75-85℃ for 3.5-5 hours, controlling the moisture content to ≤0.02%; Step 2: Blending modification: Add the dried resin, polyester polyol, plasticizer, opening agent, biodegradation accelerator, and anti-hydrolysis stabilizer to a high-speed mixer in proportion and mix at 600-1000 r / min for 10-20 min; Step 3: Twin-screw melt extrusion: using a gradient temperature of 145-175℃ and a screw speed of 150-220 r / min for plasticizing and melting; Step 4: Casting film: Cooling roller temperature 30-45℃, to obtain a base film with a thickness of 20-50μm and a surface roughness Ra≤0.05μm; Step 5: Biaxial stretching: longitudinal stretching 3.0 to 3.8 times, transverse stretching 2.5 to 3.5 times, stretching at 65 to 85°C, and heat setting at 140 to 155°C; Step 6: Vacuum coating: Vacuum degree ≤5×10⁻³Pa, aluminum layer evaporated, silicon dioxide layer deposited, and biodegradable protective layer coated in sequence; Step 7: Precision slitting and ultra-fine cutting: Slitting width 0.1-1mm, ultra-fine cutting to form flake-shaped glitter; Step 8: Air separation and dust removal to remove dust and unqualified particles; Step 9: After passing the performance test, the product is packaged to obtain a high-biodegradability, environmentally friendly glitter powder.

6. The method for preparing high biodegradability environmentally friendly glitter powder according to claim 5, characterized in that: The roughness Ra of the cast film is ≤0.05μm to ensure a mirror-like gloss.

7. The method for preparing high biodegradability environmentally friendly glitter powder according to claim 5, characterized in that: The vacuum-coated film has an adhesion of ≥4B and does not peel or oxidize.

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