Glass fiber modified antibacterial PA resin suitable for children products and preparation method thereof

Abstract

The invention relates to the technical field of PA resin, and particularly discloses glass fiber modified antibacterial PA resin suitable for children products and a preparation method of the antibacterial PA resin. The invention discloses glass fiber modified antibacterial PA resin suitable for children products. The glass fiber modified antibacterial PA resin comprises PA resin, glass fibers, talcum powder, nano calcium carbonate, a composite antibacterial agent, a compatilizer, an antioxidant and calcium stearate, the composite antibacterial agent comprises chitosan, an antibacterial peptide microcapsule and a porous silver-zinc-loaded antibacterial agent; the antibacterial peptide microcapsules are sodium alginate embedded antibacterial peptides. The antibacterial PA resin obtained in the invention has the highest bacteriostasis rates of 99.97%, 99.74% and 99.95% for staphylococcus aureus, escherichia coli and candida albicans respectively, the antibacterial property of the PA resin is improved, the compressive strength and notch impact strength are 170.6 MPa and 17.3 kJ / m < 2 > respectively, and high mechanical strength is maintained on the basis of high antibacterial property.

Description

Technical Field

[0001] This application relates to the field of PA resins, and more specifically, it relates to a glass fiber modified antibacterial PA resin suitable for children's products and a method for preparing the same. Background Technology

[0002] PA resin is the polymer material with the largest production volume, the most varieties, and the widest application fields among the five major engineering plastics. It has the advantages of being lightweight and environmentally friendly and non-toxic, and is widely used in the field of children's products. Children's products are often subjected to high-frequency use, drops, and compression, and children often bite and touch them, making them prone to bacterial growth. Therefore, PA resin has high requirements for antibacterial properties and mechanical strength.

[0003] In related technologies, in order to improve the antibacterial properties of PA resin, a polyurethane antibacterial coating is applied to the surface of children's products made of PA resin. However, PA resin has low surface polarity, and the coating is easy to fall off during frequent friction of children's products. The antibacterial properties are weak and not durable. At the same time, applying an antibacterial coating to the surface of children's products can also lead to a decrease in the gloss of the surface or color difference, making it difficult to meet the actual use requirements. Summary of the Invention

[0004] To improve the antibacterial properties and mechanical strength of PA resin, this application provides a glass fiber modified antibacterial PA resin suitable for children's products and its preparation method.

[0005] In a first aspect, this application provides a glass fiber modified antibacterial PA resin suitable for children's products, which adopts the following technical solution: An antibacterial PA resin modified with glass fiber for use in children's products, comprising the following raw materials by weight, based on the total mass of the antibacterial PA resin: 40-60 parts PA resin, 20-30 parts glass fiber, 3-5 parts talc, 4-8 parts nano calcium carbonate, 5-10 parts composite antibacterial agent, 3-5 parts compatibilizer, 0.3-0.5 parts antioxidant, and 0.3-0.5 parts calcium stearate; Based on the total mass of the composite antibacterial agent, the composite antibacterial agent comprises the following raw materials in parts by weight: 1-3 parts chitosan, 1-3 parts antimicrobial peptide microcapsules, and 0.1-0.3 parts porous silver-zinc loaded antibacterial agent; the antimicrobial peptide microcapsules are antimicrobial peptides encapsulated in sodium alginate.

[0006] When the glass fiber modified antibacterial PA resin used in this application for children's products contains 40-60 parts PA resin, 20-30 parts glass fiber, 3-5 parts talc, 4-8 parts nano calcium carbonate, 5-10 parts composite antibacterial agent, 3-5 parts compatibilizer, 0.3-0.5 parts antioxidant, and 0.3-0.5 parts calcium stearate, the performance of the PA resin is predictable, and it has high mechanical strength and antibacterial properties.

[0007] The composite antibacterial agent in the glass fiber modified antibacterial PA resin of this application for children's products is selected from 0.5-1 parts chitosan, 1-3 parts antibacterial peptide, and 0.1-0.3 parts porous silver-zinc loaded antibacterial agent. The performance of the PA resin is predictable and all have high antibacterial properties.

[0008] By employing the above technical solutions, the addition of glass fibers to the antibacterial PA resin raw material can significantly improve the tensile strength and flexural modulus of the PA resin. Furthermore, the silanol groups on the surface of the glass fibers undergo esterification with the anhydride groups of the compatibilizer to form covalent bonds, which can reduce strength loss caused by fiber pull-out. Talc powder, with its lamellar structure and parallel arrangement within the PA resin, hinders molecular chain movement and improves the mechanical strength of the antibacterial PA resin. Nano-calcium carbonate, with its large specific surface area, forms hydrogen bonds with the anhydride groups of the compatibilizer through its surface hydroxyl groups, achieving uniform dispersion and further enhancing the mechanical strength of the antibacterial PA resin.

[0009] The compatibilizer reacts with the silanol groups on the glass fiber surface to form ester bonds and with the hydroxyl groups on the nano-calcium carbonate surface to form ionic bonds, transforming the "inert filler" into an "active reinforcing phase" and further improving the mechanical strength of the antibacterial PA resin. The antioxidant reduces the melt flow rate, preventing PA resin degradation and mechanical strength loss during high-temperature use. Calcium stearate forms a lubricating interface in the PA resin melt, reducing inter-chain friction and effectively mitigating processing difficulties caused by glass fiber and other fillers.

[0010] The addition of chitosan to the composite antibacterial agent allows its amino groups to bind to bacterial cell membranes, disrupting cell membrane structure, interfering with microbial protein synthesis and DNA replication, and inhibiting bacterial growth, thus exerting an antibacterial effect. Furthermore, the addition of chitosan enhances the mechanical strength of PA resin. Antimicrobial peptide microcapsules are made by encapsulating antimicrobial peptides in sodium alginate. Encapsulation with sodium alginate prevents the antimicrobial peptides from decomposing or denaturing at high temperatures during processing, achieving protected, sustained-release, or targeted release of the antimicrobial peptides. Moreover, uniform dispersion does not easily compromise the mechanical strength of the PA resin.

[0011] In addition, chitosan can adsorb negatively charged bacteria, forming an aggregated state, shortening the interaction distance between the antimicrobial peptide microcapsules and the bacteria, and improving the antimicrobial effect of the antimicrobial peptide microcapsules. At the same time, the antimicrobial peptide microcapsules allow the bacterial contents to leak out through membrane perforation, which on the one hand plays a bactericidal role, and on the other hand provides a channel for the permeation of silver ions in the porous silver-zinc antimicrobial agent, which is beneficial for the further antimicrobial effect of the porous silver-zinc antimicrobial agent.

[0012] Chitosan, antimicrobial peptide microcapsules, and porous silver-zinc-loaded antibacterial agents are combined to achieve a multi-dimensional coupling of physical adsorption, rapid killing, and long-lasting controlled release. Chitosan acts as a bridging component, enhancing bacterial adsorption efficiency and regulating release kinetics through its network structure; antimicrobial peptides exert rapid targeted killing effects, reducing initial bacterial load; and porous silver-zinc-loaded antibacterial agents provide a long-lasting metal ion bactericidal effect. Through charge matching, target complementarity, and spatial distribution optimization, these three components achieve an enhanced antibacterial performance characterized by "high efficiency, long-lasting effect, and broad spectrum."

[0013] As a preferred embodiment: a glass fiber modified antibacterial PA resin suitable for children's products, comprising the following raw materials by weight: 45-55 parts PA resin, 24-28 parts glass fiber, 3.5-4.5 parts talc, 5-7 parts nano calcium carbonate, 7-9 parts composite antibacterial agent, 3.5-4.5 parts compatibilizer, 0.35-0.45 parts antioxidant, and 0.35-0.45 parts calcium stearate; Based on the total mass of the composite antibacterial agent, the composite antibacterial agent comprises the following raw materials in parts by weight: 1.5-2.5 parts chitosan, 1.5-2.5 parts antimicrobial peptide microcapsules, and 0.15-0.25 parts porous silver-zinc loaded antibacterial agent.

[0014] The antibacterial PA resin modified with glass fiber in this application for children's products consists of 45-55 parts PA resin, 24-28 parts glass fiber, 3.5-4.5 parts talc, 5-7 parts nano calcium carbonate, 7-9 parts composite antibacterial agent, 3.5-4.5 parts compatibilizer, 0.35-0.45 parts antioxidant, and 0.35-0.45 parts calcium stearate. The composite antibacterial agent consists of 1.5-2.5 parts chitosan, 1.5-2.5 parts antibacterial peptide microcapsules, and 0.15-0.25 parts porous silver-zinc loaded antibacterial agent. The properties of the PA resin are all predictable, and all have high antibacterial properties and mechanical strength.

[0015] Preferably, the porous silver-zinc-loaded antibacterial agent is prepared by the following steps: a porous carrier, silver acetate, zinc acetate and water at 50°C are mixed, ball-milled with zirconia grinding balls for 12 hours, cooled, filtered, washed and dried, placed in a muffle furnace and calcined at 700°C for 2 hours, and cooled to obtain the porous silver-zinc-loaded antibacterial agent.

[0016] The porous support in this application may be any one or more of porous zirconium phosphate, natural zeolite, molecular sieve, montmorillonite, and fumed silica.

[0017] Preferably, the weight ratio of the chitosan, antimicrobial peptide microcapsules and porous silver-zinc-loaded antimicrobial agent is 1:1:(0.1-0.3).

[0018] By adopting the above scheme and adjusting the weight ratio of chitosan, antimicrobial peptide microcapsules, and porous silver-zinc loaded antimicrobial agent, the synergistic antimicrobial effect of the three can be improved, thereby enhancing the antimicrobial effect of PA resin.

[0019] Preferably, the porous silver-zinc loaded antibacterial agent is prepared by modification, specifically including the following steps: S1. Place the silane coupling agent and dodecyl primary amine in a 72% ethanol solution, heat to 50-70℃, stir to dissolve, and obtain a silane coupling agent-dodecyl primary amine composite solution. S2. Add porous silver-zinc-loaded antibacterial agent to a silane coupling agent-dodecyl primary amine composite solution, disperse by ultrasonication, filter, wash, and dry to obtain a modified porous silver-zinc-loaded antibacterial agent.

[0020] The amount of silane coupling agent added is 1-5% of the mass of the porous silver-zinc antibacterial agent; the amount of dodecyl primary amine added is 2-5% of the mass of the porous silver-zinc antibacterial agent; the amount of silane coupling agent added is 1-5% of the volume of the ethanol solution; and the amount of dodecyl primary amine added is 2-5% of the volume of the ethanol solution.

[0021] By adopting the above scheme, a silane coupling agent-dodecylamine composite solution is used to modify the porous silver-zinc-loaded antibacterial agent. The silane coupling agent provides stability of covalent bonding, while the dodecylamine enhances interfacial flexibility and hydrophobic compatibility. The combined effect of the two makes the porous silver-zinc-loaded antibacterial agent more uniformly dispersed in PA resin, reduces interfacial defects, and thus improves the antibacterial effect of PA resin.

[0022] Preferably, the mass ratio of the silane coupling agent to dodecyl primary amine is 1:(1-3).

[0023] By adopting the above scheme and adjusting the mass ratio of silane coupling agent and dodecyl primary amine, the dispersion uniformity of porous silver-zinc-loaded antibacterial agent in PA resin is further improved, thereby enhancing the antibacterial effect of PA resin.

[0024] Preferably, the composite antibacterial agent also includes bioactive glass.

[0025] By employing the above technical solutions, the Ca²⁺ released by the bioactive glass forms ionic bonds with the hydroxyl groups of chitosan, enhancing the stability of the antibacterial agent in the resin. The alkaline environment of the bioactive glass promotes the dissociation of chitosan amino groups, improving the antibacterial activity of chitosan. Furthermore, the porous structure of the bioactive glass added to the composite antibacterial agent allows PA molecular chains to embed into its pores, forming a physically entangled network that strengthens interfacial bonding. Moreover, the high elastic modulus of the bioactive glass allows it to act as a rigid filler, uniformly dispersed in PA resin, directly sharing external loads, reducing stress concentration in the PA matrix, and significantly improving the mechanical properties of the PA resin. In addition, the bioactive glass can also reduce melt viscosity, improve fluidity, and overall enhance the processing performance of the antibacterial PA resin.

[0026] Preferably, the weight ratio of the bioactive glass to chitosan is 1:(0.5-1).

[0027] By adopting the above technical solution and adjusting the weight ratio of bioactive glass to chitosan, the antibacterial properties of chitosan can be further improved, thereby enhancing the antibacterial properties of PA resin.

[0028] Secondly, this application provides a method for preparing glass fiber modified antibacterial PA resin suitable for children's products according to any of the above-mentioned methods, which is achieved through the following technical solution: A method for preparing a glass fiber modified antibacterial PA resin suitable for children's products, comprising the following steps: The raw materials are mixed evenly, melted, extruded and granulated to obtain antibacterial PA resin modified with glass fiber suitable for children's products.

[0029] In summary, this application includes at least one of the following beneficial technical effects: This application improves the antibacterial properties of PA resin by controlling the types and amounts of each raw material. This results in the antibacterial PA resin exhibiting inhibition rates of 99.88%, 99.47%, and 99.79% against Staphylococcus aureus, Escherichia coli, and Candida albicans, respectively.

[0030] This application modifies the porous silver-zinc-loaded antibacterial agent in the composite antibacterial agent and controls the mass ratio of silane coupling agent and dodecyl primary amine, so that the antibacterial PA resin has antibacterial rates of 99.92-99.94%, 99.57-99.61%, and 99.85-99.88% against Staphylococcus aureus, Escherichia coli, and Candida albicans, respectively, which can further improve the antibacterial properties of the antibacterial PA resin.

[0031] This application improves the antibacterial properties of antibacterial PA resin by adding bioactive glass to the composite antibacterial agent and controlling the weight ratio of bioactive glass to chitosan, thereby achieving antibacterial rates of 99.97%, 99.74%, and 99.95% against Staphylococcus aureus, Escherichia coli, and Candida albicans, respectively.

[0032] This application achieves a maximum compressive strength of 170.6 MPa and a notched impact strength of 17.3 kJ / m² by adding glass fiber, talc, and nano-calcium carbonate to the antibacterial PA resin raw material. 2 It maintains high mechanical strength while possessing high antibacterial properties. Detailed Implementation

[0033] The following detailed description, in conjunction with specific embodiments, further illustrates this application. All the raw materials used in this application are commercially available products and are intended to fully disclose the raw materials used in this application; they should not be construed as limiting the source of the raw materials. Specifically: PA resin, type PA66; glass fiber, elongation at break 98%, length 4mm; talc powder, particle size 325 mesh; nano-calcium carbonate, particle size 20nm; compatibilizer, type TAF, purchased from Qingdao Sainuo Chemical Co., Ltd., Shandong; antioxidant, type 1010; calcium stearate, active ingredient content 99%; chitosan, active ingredient content 99%.

[0034] The following are examples of the preparation of compound antibacterial agents: Preparation Example 1 The composite antibacterial agent of Example 1 was prepared by the following steps: the raw materials were mixed evenly to obtain the composite antibacterial agent, and the specific dosage is detailed in Table 1.

[0035] Among them, the antimicrobial peptide microcapsules are antimicrobial peptides encapsulated in sodium alginate. Specifically, a 1%-2% sodium alginate aqueous solution is prepared and magnetically stirred at 600 rpm until completely dissolved. 1 kg of antimicrobial peptide was dissolved in 200 mL of deionized water to obtain an antimicrobial peptide solution. The antimicrobial peptide solution was then added to an aqueous sodium alginate solution and stirred at a constant speed of 400 rpm. Calcium chloride solution was added, and the mixture was stirred to crosslink. The mixture was washed, pre-frozen at -80℃, and vacuum dried to obtain antimicrobial peptide microcapsules.

[0036] The porous silver-zinc-loaded antibacterial agent was prepared by the following steps: 7 kg of porous carrier (zeolite, particle size 300 mesh), 1 kg of silver acetate, 1 kg of zinc acetate and 25 L of water at 50°C were mixed, ball-milled for 12 h with 21 kg of 5 mm diameter zirconia grinding balls, cooled, filtered, washed and dried, placed in a muffle furnace and calcined at 700°C for 2 h, cooled to obtain the porous silver-zinc-loaded antibacterial agent.

[0037] Preparation Examples 2-3 The composite antibacterial agents prepared in Examples 2-3 are made from the same types of raw materials and prepared by the same method as those prepared in Example 1. The difference lies in the amount of raw materials used, as detailed in Table 1.

[0038] Table 1. Dosage of each raw material in the preparation examples 1-3 of the composite antibacterial agent (unit: kg)

[0039] Preparation Example 4 The composite antibacterial agent prepared in Example 4 was prepared using the same raw material dosage and preparation method as that prepared in Example 2. The difference was that the porous silver-zinc-loaded antibacterial agent was prepared by modification. Specifically, S1, 42g of silane coupling agent and 21g of dodecyl primary amine were placed in 1L of ethanol solution, heated to 60°C, and stirred to dissolve, to obtain a silane coupling agent-dodecyl primary amine composite solution; S2, 1kg of porous silver-zinc-loaded antibacterial agent was added to the silane coupling agent-dodecyl primary amine composite solution, ultrasonically dispersed, filtered, washed, and dried to obtain the modified porous silver-zinc-loaded antibacterial agent.

[0040] Preparation Examples 5-8 The composite antibacterial agents prepared in Examples 5-8 were prepared using the same raw material dosage and method as those prepared in Example 4. The difference was that when modifying the porous silver-zinc-loaded antibacterial agent, the dosages of silane coupling agent and dodecyl primary amine were 31.5g and 31.5g, 21g and 42g, 15.75g and 47.25g, and 14g and 49g, respectively, while the dosages of the remaining raw materials remained unchanged.

[0041] Example 1 The glass fiber modified antibacterial PA resin suitable for children's products in Example 1 was prepared by the following steps: The raw materials were mixed, extruded and granulated to obtain antibacterial PA resin. The specific dosages are shown in Table 2. The composite antibacterial agent was the antibacterial agent obtained in Preparation Example 1.

[0042] Example 2-3 The glass fiber modified antibacterial PA resins used in Examples 2-3 for children's products are prepared in the same way as those in Example 1, using the same methods and raw materials. The difference lies in the dosage of each raw material, as detailed in Table 2.

[0043] Table 2. Raw material dosages for antibacterial PA resins in Examples 1-3 (unit: kg)

[0044] Examples 4-10 The preparation method of the glass fiber modified antibacterial PA resin for children's products in Examples 4-10 is the same as that in Example 2, except that the antibacterial agent is the composite antibacterial agent prepared in Examples 2-8, and the other raw materials and dosages are the same as in Example 2.

[0045] Examples 11-15 The preparation method of the glass fiber modified antibacterial PA resin for children's products in Examples 11-15 is the same as that in Example 8. The difference is that the composite antibacterial agent raw materials also include bioactive glass. The amount of bioactive glass used is 30 kg, 20 kg, 24 kg, 15 kg and 12 kg respectively. The types and amounts of other raw materials are the same as in Example 8.

[0046] Comparative Example 1 The glass fiber modified antibacterial PA resin for children's products in Comparative Example 1 was prepared in the same way as in Example 1, except that the antimicrobial peptide microcapsules were replaced with an equal amount of antimicrobial peptides, while the other raw materials and dosages were the same as in Example 1.

[0047] Comparative Example 2 The glass fiber modified antibacterial PA resin for children's products in Comparative Example 2 was prepared in the same way as in Example 1, except that chitosan was replaced with an equal amount of antibacterial peptide microcapsules, while the other raw materials and dosages were the same as in Example 1.

[0048] Comparative Example 3 The glass fiber modified antibacterial PA resin for children's products in Comparative Example 3 was prepared in the same way as in Example 1, except that the antibacterial peptide microcapsules were replaced with chitosan in equal amounts, while the other raw materials and dosages were the same as in Example 1.

[0049] Comparative Example 4 The glass fiber modified antibacterial PA resin for children's products in Comparative Example 4 was prepared in the same way as in Example 1, except that the porous silver-zinc loaded antibacterial agent was replaced with chitosan in equal amounts, and the remaining raw materials and dosages were the same as in Example 1.

[0050] Comparative Example 5 The glass fiber modified antibacterial PA resin for children's products in Comparative Example 5 was prepared in the same way as in Example 1, except that no glass fiber was added, and the other raw materials and dosages were the same as in Example 1.

[0051] Comparative Example 6 The glass fiber modified antibacterial PA resin for children's products in Comparative Example 6 was prepared in the same way as in Example 1, except that no talc was added, and the other raw materials and dosages were the same as in Example 1.

[0052] Comparative Example 7 The glass fiber modified antibacterial PA resin for children's products in Comparative Example 7 was prepared in the same way as in Example 1, except that nano-calcium carbonate was not added, and the other raw materials and dosages were the same as in Example 1.

[0053] Performance testing I. Antibacterial performance testing The antibacterial PA resins obtained in different Examples 1-15 and Comparative Examples 1-7 were tested using the following testing standards or methods. The test results are detailed in Table 3.

[0054] Antibacterial rate: The antibacterial rate of antibacterial PA resin against Staphylococcus aureus and Escherichia coli was tested according to GB / T 31402-2015 "Test Method for Antibacterial Properties of Plastic Surfaces". The national film adhesion method was used to test the antibacterial rate of antibacterial PA resin against Candida albicans. Table 3 Performance test results of different antibacterial PA resins

[0055] The test results in Table 3 show that the antibacterial PA resin obtained in this application has the highest inhibition rates against Staphylococcus aureus, Escherichia coli and Candida albicans, at 99.97%, 99.74% and 99.95%, respectively, which improves the antibacterial properties of PA resin.

[0056] Based on the data of various indicators of the antibacterial PA resin in Examples 1-3, it was found that the antibacterial PA resin in Example 2 had inhibition rates of 99.86%, 99.45%, and 99.76% against Staphylococcus aureus, Escherichia coli, and Candida albicans, respectively, which were all higher than those in Examples 1 and 3. This indicates that the amount of composite antibacterial agent added to the raw material of the antibacterial PA resin in Example 2 was appropriate, giving the antibacterial PA resin high antibacterial properties.

[0057] Combining the data of various indicators of the antibacterial PA resin in Examples 2 and 4-5, it was found that the antibacterial PA resin in Example 4 had inhibition rates of 99.88%, 99.47%, and 99.79% against Staphylococcus aureus, Escherichia coli, and Candida albicans, respectively, which were all higher than those in Examples 2 and 5. This indicates that the amount of each raw material in the composite antibacterial agent added to the antibacterial PA resin raw material in Example 4 was appropriate, which improved the antibacterial properties of the antibacterial PA resin.

[0058] Based on the data of various indicators of the antibacterial PA resins in Examples 6-10, it was found that the antibacterial PA resins in Examples 7-9 had inhibition rates of 99.92-99.94%, 99.57-99.61%, and 99.85-99.88% against Staphylococcus aureus, Escherichia coli, and Candida albicans, respectively, which were all higher than those in Examples 6 and 10. This indicates that modifying the porous silver-zinc-loaded antibacterial agent in the composite antibacterial agent, and further improving the antibacterial properties of the antibacterial PA resin when the mass ratio of silane coupling agent to dodecyl primary amine is 1:(1-3), can further enhance the antibacterial properties of the antibacterial PA resin.

[0059] Based on the data of various indicators of the antibacterial PA resins in Examples 11-15, it was found that the antibacterial PA resins in Examples 12-14 had inhibition rates of 99.97%, 99.71-99.74%, and 99.93-99.95% against Staphylococcus aureus, Escherichia coli, and Candida albicans, respectively, which were all higher than those in Examples 11 and 15. This indicates that adding bioactive glass to the composite antibacterial agent and controlling the weight ratio of bioactive glass to chitosan to be 1:(0.5-1) can further improve the antibacterial properties of the antibacterial PA resin.

[0060] Furthermore, based on the data of various indicators of the antibacterial PA resins in Comparative Examples 1-4 and Example 1, it was found that the chitosan, antibacterial peptide microcapsules, and porous silver-zinc loaded antibacterial agent added to the antibacterial PA resin raw materials in this application can improve the antibacterial properties of the antibacterial PA resin to varying degrees.

[0061] II. Mechanical Property Testing The antibacterial PA resins obtained in different Examples 2, 4, 8, 13 and Comparative Examples 1-7 were tested using the following testing standards or methods. Before testing, the antibacterial PA resins obtained in this application were made into test strips. The test results are shown in Table 4.

[0062] Compressive strength: The compressive strength of antibacterial PA resin was tested according to GB / T 1041-2008 standard.

[0063] Notched impact strength: The notched impact strength of antibacterial PA resin was tested according to GB / T 1043-2008 standard.

[0064] Table 4 Performance test results of different antibacterial PA resins

[0065] The test results in Table 4 show that the highest compressive strength and notched impact strength of the antibacterial PA resin obtained in this application are 170.6 MPa and 17.3 kJ / m, respectively. 2 It maintains high mechanical strength while possessing high antibacterial properties.

[0066] Furthermore, based on the data of various indicators of the antibacterial PA resins in Comparative Examples 5-7 and Example 1, it was found that the glass fiber, talc powder and nano-calcium carbonate added to the antibacterial PA resin raw materials in this application can all improve the mechanical properties of the antibacterial PA resin to varying degrees.

[0067] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A glass fiber modified treated antibacterial PA resin for children's products, characterized in that, The antibacterial PA resin comprises the following raw materials in parts by weight based on the total mass of the antibacterial PA resin: PA resin 40-60 parts, glass fiber 20-30 parts, talcum powder 3-5 parts, nano calcium carbonate 4-8 parts, composite antibacterial agent 5-10 parts, compatibility agent 3-5 parts, antioxidant 0.3-0.5 parts, and calcium stearate 0.3-0.5 parts; The composite antibacterial agent comprises the following raw materials in parts by weight based on the total mass of the composite antibacterial agent: chitosan 1-3 parts, antibacterial peptide microcapsule 1-3 parts, and porous silver-zinc-loaded antibacterial agent 0.1-0.3 parts; the antibacterial peptide microcapsule is sodium alginate-embedded antibacterial peptide.

2. The glass fiber-modified, antibacterial PA resin for child-care articles according to claim 1, characterized by, The antibacterial PA resin comprises the following raw materials in parts by weight based on the total mass of the antibacterial PA resin: PA resin 45-55 parts, glass fiber 24-28 parts, talcum powder 3.5-4.5 parts, nano calcium carbonate 5-7 parts, composite antibacterial agent 7-9 parts, compatibility agent 3.5-4.5 parts, antioxidant 0.35-0.45 parts, and calcium stearate 0.35-0.45 parts; The composite antibacterial agent comprises the following raw materials in parts by weight based on the total mass of the composite antibacterial agent: chitosan 1.5-2.5 parts, antibacterial peptide microcapsule 1.5-2.5 parts, and porous silver-zinc-loaded antibacterial agent 0.15-0.25 parts.

3. The glass fiber modified, antibacterial PA resin for child-care articles according to claim 1, characterized by: The porous silver-zinc-loaded antibacterial agent is prepared by the following steps: mixing a porous carrier, silver acetate, zinc acetate and water at 50 ℃, ball-milling with zirconium oxide grinding balls for 12 h, cooling, washing by suction filtration, drying, placing in a muffle furnace for calcination at 700 ℃ for 2 h, and cooling to obtain the porous silver-zinc-loaded antibacterial agent.

4. The glass fiber modified, antibacterial PA resin for child-care articles according to claim 1, characterized by: The weight ratio of the chitosan, the antibacterial peptide microcapsule and the porous silver-zinc-loaded antibacterial agent is 1:1:(0.1-0.3).

5. The glass fiber modified, antibacterial PA resin for child-care articles according to claim 1, characterized by, The porous silver-zinc-loaded antibacterial agent is prepared by modification, specifically comprising the following steps: S1, placing a silane coupling agent and dodecyl primary amine in an ethanol solution, heating to 50-70 ℃, stirring to dissolve, to obtain a silane coupling agent-dodecyl primary amine composite solution; S2, adding the porous silver-zinc-loaded antibacterial agent to the silane coupling agent-dodecyl primary amine composite solution, ultrasonic dispersion, filtration and washing, and drying to obtain a modified porous silver-zinc-loaded antibacterial agent.

6. The glass fiber-modified, antibacterial PA resin for child-care articles according to claim 5, characterized by, The mass ratio of the silane coupling agent and the dodecyl primary amine is 1:(1-3).

7. The glass fiber modified, antibacterial PA resin for child-care articles according to claim 1, characterized by: The composite antibacterial agent further comprises bioactive glass.

8. The glass fiber modified, antibacterial PA resin for child-care articles according to claim 7, characterized by: The weight ratio of the bioactive glass and the chitosan is 1:(0.5-1).

9. A method of producing the glass fiber-modified, antibacterial PA resin for children's articles according to any one of claims 1 to 8, characterized by, The following operation steps are included: The raw materials are mixed uniformly, melted, extruded and granulated to obtain the glass fiber-modified antibacterial PA resin suitable for children's products.

Images