Antibacterial composite material for high borosilicate glass and preparation method thereof

Abstract

The invention belongs to the technical field of composite materials, and particularly relates to an antibacterial composite material for high borosilicate glass and a preparation method of the antibacterial composite material. The semi-aromatic nylon material is prepared from the following components in parts by weight: semi-aromatic nylon, fiber reinforced filler, a flexibilizer, nano titanium dioxide, tetrapod-like zinc oxide whiskers and micro-nano diatomite. The semi-aromatic nylon has high impact performance of aliphatic nylon and high rigidity of aromatic nylon. The tetrapod-like zinc oxide whiskers are beneficial to dispersion of the nano titanium dioxide, so that the nano titanium dioxide is more easily and uniformly dispersed in the composite material, and the technical problem that the mechanical property and antibacterial activity of the composite material are reduced due to the fact that the nano titanium dioxide is easily agglomerated is solved. The diatomite with the micro-nano structure not only has the dispersing performance, but also can be mutually matched with the titanium dioxide with the nano structure and the tetrapod-like zinc oxide to promote mutual dispersion, so that the strength and the antibacterial ability of the composite material are better improved.

Description

Technical Field

[0001] This invention belongs to the field of composite material technology, specifically relating to antibacterial composite materials for high borosilicate glass and their preparation methods. Background Technology

[0002] High borosilicate glass has been widely used and developed due to its excellent properties. From instrument glass to fire-resistant architectural glass, from cookware to display glass, and from the chemical industry to optoelectronics, high borosilicate glass is applied in various fields. With the improvement of glass melting and forming technologies in recent years, high borosilicate glass will see even greater applications and development, and its development prospects are unparalleled by other types of glass.

[0003] As people's requirements for glass and its quality continue to improve, high borosilicate glass will play a more important role in the glass industry. Among them, tableware glass is similar to container glass and is a branch of the glass industry. The main manufacturing methods are blowing, pressing and press-blowing. Tableware glass can be divided into the following categories according to its function: (1) ordinary glassware; (2) crystal glassware; (3) heat-resistant glassware; (4) microcrystalline glassware; (5) tempered glassware; (6) laminated high-strength glassware; (7) colored photosensitive glassware. With the development and popularity of various household appliances, heat-resistant tableware, high-strength tableware, and glassware resistant to paint corrosion have been developed. High borosilicate glass has a low coefficient of expansion, a high softening point and good resistance to rapid heating and cooling. The production process is simpler than that of microcrystalline glass. It can be refined in a tank furnace and can also be produced mechanically. Therefore, it is widely used in the manufacture of tableware and cookware. However, high borosilicate glass is brittle and has low impact resistance; moreover, it is prone to bacterial growth when used in household products, which limits its application.

[0004] CN102993721A discloses a cover plate for an automotive central electrical box and its manufacturing method. The method mainly involves first preparing material A and material B, then drying them and mixing them according to a specified ratio. The mixture is then added to a preheated injection molding machine. By setting the injection pressure, speed, injection time, and injection volume at different stages of the injection molding machine, and simultaneously setting the final holding pressure and holding speed, the optimal injection molding process is achieved, resulting in a qualified product. This method solves the problem of physical property defects such as whitening, breakage, poor toughness, and low strength that easily occur in injection-molded automotive central electrical box covers. It also improves the stability of the injection molding process, resulting in consistent product quality, increased production efficiency, and reduced production costs. CN118879064A discloses a copper antibacterial polyamide 6 masterbatch and its preparation method and application, belonging to the field of functional fiber materials technology. The preparation of the copper antibacterial polyamide 6 masterbatch includes the following steps: (1) modifying nano-cuprous oxide powder with benzotriazole to obtain modified nano-cuprous oxide powder; (2) the modified nano-cuprous oxide powder, polyamide 6 chips and dispersant are melt-plasticized, screw-transported and sheared, water-cooled pelletized and vibrated screened to obtain copper antibacterial polyamide 6 masterbatch. The copper antibacterial polyamide 6 masterbatch is applied to the melt spinning of copper antibacterial polyamide 6 pre-oriented yarn. The obtained pre-oriented yarn has good antibacterial properties, spinnability and antioxidant properties. In addition, there are few copper particles remaining in the spinning component, the spinning component has a long life, the spinning process has good operability, high production efficiency and is suitable for large-scale industrial production. CN119552503A also discloses a nano-photocatalytic self-cleaning composite material and a food preservation cap and its preparation method, which improves its photocatalytic self-cleaning performance. However, it uses expensive materials such as boron nitride and carbon nanotubes, which limits its application range and cannot be promoted and used on a large scale. Summary of the Invention

[0005] In view of this, the present invention provides an antibacterial composite material for high borosilicate glass and a method for preparing the same. The composite material has high mechanical properties and high impact toughness; at the same time, it has excellent antibacterial properties and can effectively inhibit the growth of bacteria. It can be used as a cover or covering film for high borosilicate glass, thus expanding the application of high borosilicate glass in the home furnishing field.

[0006] The present invention solves the above-mentioned technical problems by means of the following technical solution: An antibacterial composite material for high borosilicate glass comprises the following components in parts by weight: 80-100 parts of semi-aromatic nylon, 0-15 parts of fiber-reinforced filler, 10-20 parts of toughening agent, 15-25 parts of nano titanium dioxide, 5-10 parts of tetra-needle zinc oxide whiskers, and 1-5 parts of micro-nano diatomaceous earth.

[0007] As a cover or coating material for borosilicate glass, it is required to have high mechanical properties. Semi-aromatic nylon combines the high impact resistance of aliphatic nylon with the high rigidity of aromatic nylon. At the same time, semi-aromatic nylon has good processing properties, which is conducive to processing it into sheets and other devices.

[0008] Preferably, the semi-aromatic nylon is at least one of PA6T, PA6I, PA6T / 6I, PA6T / 6I / 12, PA9T, PA10T, PA12T, and MXD6. Particularly preferred are long-chain semi-aromatic nylons such as PA6T / 6I / 12, PA9T, PA10T, and PA12T, which have better processing properties.

[0009] However, the mechanical properties of pure semi-aromatic nylon materials are still relatively low, and they lack antibacterial properties. Therefore, this invention adds a certain amount of nano-titanium dioxide, tetraneedle-shaped zinc oxide whiskers, and micro / nano diatomaceous earth composite fillers. Titanium dioxide is a widely studied material with high antibacterial activity. Due to its low toxicity, high safety, and non-irritating properties to the skin, titanium dioxide has become one of the most commonly used antibacterial materials. The hydroxyl radicals it generates can react with biological macromolecules, destroying the structure of biological cells and leading to cell death. However, as a nanoscale filler, nano-titanium dioxide has poor dispersibility in resins, and its antibacterial mechanism is singular, limiting its ability to improve antibacterial activity. The nano-titanium dioxide used in this invention has a volume average particle size (D50) of 10-100 nm. Specifically, it can be 10 nm, 20 nm, 30 nm, 40 nm, 50 nm, 60 nm, 70 nm, 80 nm, 90 nm, or 100 nm. Although nano-titanium dioxide has enhancing and antibacterial properties, excessive use due to its micro-size effect can cause agglomeration, which may lead to a decrease in performance.

[0010] The addition of tetragonal zinc oxide whiskers and diatomaceous earth effectively solves the aforementioned problems. Tetragonal zinc oxide whiskers are whiskers with a three-dimensional structure, consisting of a central body and four needle-like crystals, each extending from the centroid of the tetrahedron towards the three-dimensional direction (the vertices of the tetrahedron). Due to their highly ordered atomic arrangement, the strength and modulus of tetragonal zinc oxide whiskers approach the theoretical strength of interatomic valence bonds in materials, making them a novel reinforcing and toughening material for composite materials with excellent mechanical properties. Due to their unique structure, in addition to reinforcement, tetragonal zinc oxide whiskers exhibit broad-spectrum antibacterial, antifungal, and antistatic properties. The four nano-effect needle-like tips of the tetragonal zinc oxide whiskers do not agglomerate and facilitate the dispersion of nano-titanium dioxide, making it easier to disperse evenly in composite materials. This solves the technical problem of reduced mechanical properties and antibacterial activity in composite materials due to the easy agglomeration of nano-titanium dioxide. Diatomaceous earth, as a siliceous sedimentary rock, generally possesses a micro-nano structure in practical applications, with a volume average particle size (D50) between 100-800 nm. It exhibits high porosity, low density, and high specific surface area. Particularly preferred micro-nano diatomaceous earth has a volume average particle size of 200-600 nm, with a further preferred size of 300-500 nm. This appropriately sized micro-nano diatomaceous earth not only maintains good dispersibility but also synergizes with nanostructured titanium dioxide and tetraneedle-shaped zinc oxide, promoting their dispersion and enhancing the strength and antibacterial properties of the composite material. Although the antibacterial ability of micro-nano diatomaceous earth is somewhat reduced compared to metal oxides, it still possesses strong antibacterial activity and can inhibit the growth of many common bacteria. More importantly, the micro-nano structure of diatomaceous earth contains numerous nanoscale pores, which not only facilitates bonding with resins but also further promotes the dispersion of nano-titanium dioxide and tetraneedle-shaped zinc oxide, further improving the antibacterial activity and mechanical properties of the composite material.

[0011] Preferably, the fiber-reinforced filler is at least one of glass fiber, carbon fiber, and natural fiber.

[0012] Preferably, the toughening agent is at least one of maleic anhydride-grafted polystyrene, maleic anhydride-grafted polyethylene, maleic anhydride-grafted polypropylene, maleic anhydride-grafted polyphenylene ether, maleic anhydride-grafted polyphenylene sulfide, maleic anhydride-grafted ethylene octene copolymer, and maleic anhydride-grafted ethylene propylene diene monomer (EPDM) rubber.

[0013] Preferably, the fiber-reinforced filler is glass fiber. The glass fiber typically has a length between 2-40 mm and a diameter between 1-20 μm, exhibiting excellent reinforcing ability and corrosion resistance. Specifically, it is alkali-free glass fiber.

[0014] Preferably, the antibacterial composite material for high borosilicate glass further includes other fillers, and preferably, the filler is 1-20 parts.

[0015] Preferably, the filler is at least one of antioxidants, coupling agents, light stabilizers, water-resistant agents, colorants, flame retardants, lubricants, plasticizers, and flow modifiers; preferably, the filler is at least one of antioxidants, coupling agents, lubricants, and plasticizers.

[0016] Preferably, the antibacterial composite material for high borosilicate glass comprises the following components in parts by weight: Semi-aromatic nylon 85-95 parts, fiber-reinforced filler 10-15 parts, toughening agent 12-17 parts, nano titanium dioxide 15-20 parts, tetra-needle zinc oxide whiskers 6-9 parts, micro-nano diatomaceous earth 2-4 parts.

[0017] On the other hand, the present invention also provides a method for preparing an antibacterial composite material for high borosilicate glass, comprising the following steps: (1) Mix semi-aromatic nylon, toughening agent, nano titanium dioxide, tetra-needle zinc oxide whiskers and micro-nano diatomaceous earth evenly to obtain a premix; (2) The premixed material is added to the twin-screw extruder from the main feed port, and then the fiber-reinforced filler is added to the twin-screw extruder from the side feed port. The mixture is melted, extruded and granulated to obtain the antibacterial composite material for high borosilicate glass.

[0018] Preferably, the twin-screw extruder has a screw speed of 400-600 r / min and an extrusion temperature of 270-330℃.

[0019] Beneficial Effects: Semi-aromatic nylon combines the high impact resistance of aliphatic nylon with the high rigidity of aromatic nylon. Furthermore, semi-aromatic nylon has good processing properties, making it suitable for manufacturing sheets and other components. The addition of tetraneedle-shaped zinc oxide whiskers and diatomaceous earth effectively solves the problems of low antibacterial activity and easy agglomeration of nano-titanium dioxide. Due to its unique structure, tetraneedle-shaped zinc oxide whiskers, in addition to their reinforcing properties, exhibit broad-spectrum antibacterial, antifungal, and antistatic properties. They also facilitate the dispersion of nano-titanium dioxide, making it easier to disperse evenly in the composite material, thus solving the technical problem of reduced mechanical properties and antibacterial activity caused by the agglomeration of nano-titanium dioxide. Micro- and nano-diatomaceous earth, on the other hand, not only ensures good dispersion performance but also works synergistically with the nanostructured titanium dioxide and tetraneedle-shaped zinc oxide to promote their dispersion, thereby better improving the strength and antibacterial ability of the composite material. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by those skilled in the art to which this invention pertains.

[0021] The terms "first," "second," and similar words used in the specification and claims of this patent application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, unless the context clearly indicates otherwise, the singular forms of "an," "a," or "the," etc., do not indicate a quantity limitation, but rather indicate the presence of at least one. Terms such as "comprising" or "including" mean that the element or object preceding "comprising" encompasses the features, integrals, steps, operations, elements, and / or components listed following "comprising" or "including," and do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or collections thereof. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described object changes.

[0022] Unless otherwise specified, the raw material types and preparation processes used in the following examples and comparative examples are the same. Specifically, the semi-aromatic nylon is nylon 12T; the glass fiber has a diameter of approximately 10 μm and an average length of 3 mm; the toughening agent is maleic anhydride-grafted ethylene octene copolymer; the tetraneedle-shaped zinc oxide whiskers have a needle length of approximately 50-80 μm and a needle root diameter of approximately 3-8 μm.

[0023] The preparation method of the antibacterial composite material for high borosilicate glass includes the following steps: (1) Mix semi-aromatic nylon, toughening agent, nano titanium dioxide, tetra-needle zinc oxide whiskers, micro-nano diatomaceous earth and other fillers evenly to obtain a premix; (2) The premixed material is added to the twin-screw extruder through the main feed port, and then the glass fiber reinforced filler is added to the twin-screw extruder through the side feed port. The material is melted, extruded and granulated to obtain the antibacterial composite material for high borosilicate glass. The screw speed of the twin-screw extruder is 500 r / min and the extrusion temperature is 315℃.

[0024] Example 1 An antibacterial composite material for high borosilicate glass comprises the following components in parts by weight: The composition comprises 80 parts of semi-aromatic nylon 12T, 10 parts of glass fiber, 10 parts of toughening agent maleic anhydride-grafted ethylene octene copolymer, 15 parts of nano titanium dioxide, 5 parts of tetraneedle-shaped zinc oxide whiskers, 1 part of micro-nano diatomaceous earth, 1 part of antioxidant 1010, 1 part of coupling agent KH550, and 1 part of flow modifier calcium stearate; the volume average particle size of the nano titanium dioxide is 40 nm; and the volume average particle size of the micro-nano diatomaceous earth is 300 nm.

[0025] Example 2 An antibacterial composite material for high borosilicate glass comprises the following components in parts by weight: The composition comprises 100 parts of semi-aromatic nylon 12T, 15 parts of glass fiber, 20 parts of toughening agent maleic anhydride-grafted ethylene octene copolymer, 20 parts of nano titanium dioxide, 10 parts of tetraneedle-shaped zinc oxide whiskers, 5 parts of micro-nano diatomaceous earth, 3 parts of antioxidant 1010, 3 parts of coupling agent KH550, and 3 parts of flow modifier talc; the volume average particle size of the nano titanium dioxide is 80 nm; and the volume average particle size of the micro-nano diatomaceous earth is 500 nm.

[0026] Example 3 An antibacterial composite material for high borosilicate glass comprises the following components in parts by weight: The composition comprises 90 parts of semi-aromatic nylon 12T, 13 parts of glass fiber, 15 parts of toughening agent (maleic anhydride-grafted ethylene octene copolymer), 25 parts of nano-titanium dioxide, 8 parts of tetraneedle-shaped zinc oxide whiskers, 3 parts of micro-nano diatomaceous earth, 2 parts of antioxidant 1010, 2 parts of coupling agent KH550, and 2 parts of flow modifier zinc stearate; the nano-titanium dioxide has a volume average particle size of 50 nm; and the micro-nano diatomaceous earth has a volume average particle size of 400 nm.

[0027] Example 4 An antibacterial composite material for high borosilicate glass comprises the following components in parts by weight: The composition comprises 80 parts of semi-aromatic nylon 12T, 15 parts of glass fiber, 10 parts of toughening agent maleic anhydride-grafted ethylene octene copolymer, 20 parts of nano titanium dioxide, 5 parts of tetraneedle-shaped zinc oxide whiskers, 5 parts of micro-nano diatomaceous earth, 1 part of antioxidant 1010, 3 parts of coupling agent KH550, and 1 part of flow modifier zinc stearate; the volume average particle size of the nano titanium dioxide is 40 nm; and the volume average particle size of the micro-nano diatomaceous earth is 500 nm.

[0028] Example 5 An antibacterial composite material for high borosilicate glass comprises the following components in parts by weight: The composition comprises 90 parts of semi-aromatic nylon 12T, 13 parts of glass fiber, 15 parts of toughening agent (maleic anhydride-grafted ethylene octene copolymer), 18 parts of nano-titanium dioxide, 8 parts of tetraneedle-shaped zinc oxide whiskers, 3 parts of micro-nano diatomaceous earth, 2 parts of antioxidant 1010, 2 parts of coupling agent KH550, and 2 parts of flow modifier zinc stearate; the nano-titanium dioxide has a volume average particle size of 50 nm; and the micro-nano diatomaceous earth has a volume average particle size of 100 nm.

[0029] Example 6 An antibacterial composite material for high borosilicate glass comprises the following components in parts by weight: The composition comprises 85 parts of semi-aromatic nylon 12T, 11 parts of glass fiber, 13 parts of toughening agent maleic anhydride-grafted ethylene octene copolymer, 16 parts of nano titanium dioxide, 6 parts of tetraneedle-shaped zinc oxide whiskers, 2 parts of micro-nano diatomaceous earth, 1.5 parts of antioxidant 1010, 1.6 parts of coupling agent KH550, and 1.3 parts of flow modifier polytetrafluoroethylene; the volume average particle size of the nano titanium dioxide is 60 nm; and the volume average particle size of the micro-nano diatomaceous earth is 300 nm.

[0030] Example 7 An antibacterial composite material for high borosilicate glass comprises the following components in parts by weight: The composition comprises 90 parts of semi-aromatic nylon 12T, 13 parts of glass fiber, 15 parts of toughening agent (maleic anhydride-grafted ethylene octene copolymer), 18 parts of nano-titanium dioxide, 8 parts of tetraneedle-shaped zinc oxide whiskers, 3 parts of micro-nano diatomaceous earth, 2 parts of antioxidant 1010, 2 parts of coupling agent KH550, and 2 parts of flow modifier zinc stearate; the nano-titanium dioxide has a volume average particle size of 50 nm; and the micro-nano diatomaceous earth has a volume average particle size of 800 nm.

[0031] Example 8 An antibacterial composite material for high borosilicate glass comprises the following components in parts by weight: The composition comprises 95 parts of semi-aromatic nylon 12T, 14 parts of glass fiber, 18 parts of toughening agent (maleic anhydride-grafted ethylene octene copolymer), 18 parts of nano-titanium dioxide, 9 parts of tetraneedle-shaped zinc oxide whiskers, 4 parts of micro-nano diatomaceous earth, 2.2 parts of antioxidant 1010, 2.4 parts of coupling agent KH550, and 2.4 parts of flow modifier calcium stearate; the volume average particle size of the nano-titanium dioxide is 70 nm; and the volume average particle size of the micro-nano diatomaceous earth is 500 nm.

[0032] Example 9 An antibacterial composite material for high borosilicate glass comprises the following components in parts by weight: The composition includes 88 parts of semi-aromatic nylon 12T, 12.5 parts of glass fiber, 14 parts of toughening agent maleic anhydride-grafted ethylene octene copolymer, 16 parts of nano titanium dioxide, 7.5 parts of tetraneedle-shaped zinc oxide whiskers, 3.5 parts of micro-nano diatomaceous earth, 2 parts of antioxidant 1010, 3 parts of coupling agent KH550, and 1.8 parts of flow modifier polytetrafluoroethylene; the volume average particle size of the nano titanium dioxide is 50 nm; and the volume average particle size of the micro-nano diatomaceous earth is 400 nm.

[0033] Example 10 An antibacterial composite material for high borosilicate glass comprises the following components in parts by weight: The composition comprises 90 parts of semi-aromatic nylon 12T, 13 parts of glass fiber, 15 parts of toughening agent (maleic anhydride-grafted ethylene octene copolymer), 18 parts of nano-titanium dioxide, 8 parts of tetraneedle-shaped zinc oxide whiskers, 3 parts of micro-nano diatomaceous earth, 2 parts of antioxidant 1010, 2 parts of coupling agent KH550, and 2 parts of flow modifier zinc stearate; the nano-titanium dioxide has a volume average particle size of 50 nm; and the micro-nano diatomaceous earth has a volume average particle size of 400 nm.

[0034] Comparative Example 1 An antibacterial composite material for high borosilicate glass comprises the following components in parts by weight: The composition comprises: 90 parts of semi-aromatic nylon 12T, 13 parts of glass fiber, 15 parts of toughening agent (maleic anhydride-grafted ethylene-octene copolymer), 18 parts of nano-titanium dioxide, 0 parts of tetraneedle-shaped zinc oxide whiskers, 11 parts of micro-nano diatomaceous earth, 2 parts of antioxidant 1010, 2 parts of coupling agent KH550, and 2 parts of flow modifier zinc stearate; the volume average particle size of the nano-titanium dioxide is 50 nm; and the volume average particle size of the micro-nano diatomaceous earth is 400 nm.

[0035] Comparative Example 2 An antibacterial composite material for high borosilicate glass comprises the following components in parts by weight: The composition comprises: 90 parts of semi-aromatic nylon 12T, 13 parts of glass fiber, 15 parts of toughening agent (maleic anhydride-grafted ethylene octene copolymer), 18 parts of nano-titanium dioxide, 11 parts of tetraneedle-shaped zinc oxide whiskers, 0 parts of micro / nano diatomaceous earth, 2 parts of antioxidant 1010, 2 parts of coupling agent KH550, and 2 parts of flow modifier zinc stearate; the nano-titanium dioxide has a volume average particle size of 50 nm; and the micro / nano diatomaceous earth has a volume average particle size of 400 nm.

[0036] Comparative Example 3 An antibacterial composite material for high borosilicate glass comprises the following components in parts by weight: The composition comprises 90 parts of semi-aromatic nylon 12T, 13 parts of glass fiber, 15 parts of toughening agent maleic anhydride-grafted ethylene octene copolymer, 18 parts of nano titanium dioxide, 3 parts of tetraneedle-shaped zinc oxide whiskers, 8 parts of micro-nano diatomaceous earth, 2 parts of antioxidant 1010, 2 parts of coupling agent KH550, and 2 parts of flow modifier zinc stearate; the nano titanium dioxide has a volume average particle size of 50 nm; and the micro-nano diatomaceous earth has a volume average particle size of 400 nm.

[0037] The antibacterial composite materials for high borosilicate glass prepared in the above examples and comparative examples were injection molded into standard samples. Their tensile strength was tested according to standard ISO 527, their flexural strength was tested according to standard ISO 178, their notched impact strength was tested according to standard ISO 179, and their antibacterial rate against Escherichia coli was tested according to standard GB / T21510-2008. The results are shown in the table below.

[0038] Table 1. Properties of composite materials prepared in Examples 1-10 and Comparative Examples 1-3 Continued from Table 1 As can be seen from the above examples and comparative examples, semi-aromatic nylon combines the high impact performance of aliphatic nylon with the high rigidity of aromatic nylon. The addition of tetraneedle-shaped zinc oxide whiskers and diatomaceous earth effectively solves the problems of low antibacterial activity and easy agglomeration of nano-titanium dioxide. Due to its unique structure, tetraneedle-shaped zinc oxide whiskers, in addition to being used for reinforcement, exhibit broad-spectrum antibacterial, antifungal, and antistatic properties. Moreover, it is beneficial to the dispersion of nano-titanium dioxide, making it easier to disperse evenly in the composite material, thus solving the technical problem of reduced mechanical properties and antibacterial activity of the composite material due to the easy agglomeration of nano-titanium dioxide. Diatomaceous earth with micro-nano structure not only takes into account the dispersion performance, but can also cooperate with nano-structured titanium dioxide and tetraneedle-shaped zinc oxide to promote their dispersion and better improve the strength and antibacterial ability of the composite material. Specifically, compared with Example 10, Comparative Examples 1 and 2 lack tetraneedle-shaped zinc oxide whiskers and micro-nano diatomaceous earth, respectively, resulting in uneven dispersion of inorganic fillers and deterioration of the antibacterial and mechanical properties of the composite material. For example, when no micro / nano diatomaceous earth is added, although the tensile strength does not change significantly, the impact toughness is greatly reduced, and the antibacterial ability also decreases to some extent. Compared with Example 10, the amount of tetraneedle zinc oxide in Comparative Example 3 is too small, while the amount of micro / nano diatomaceous earth is too large. This not only easily leads to uneven dispersion of nano titanium dioxide and reduces antibacterial performance, but also the excessive amount of large-particle-size micro / nano diatomaceous earth reduces the impact performance of the system, failing to meet the usage requirements.

[0039] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the invention. Therefore, the scope of protection of the present invention shall be determined by the claims.

Claims

1. An antibacterial composite material for high borosilicate glass, characterized in that, It contains the following components in parts by weight: 80-100 parts of semi-aromatic nylon, 0-15 parts of fiber-reinforced filler, 10-20 parts of toughening agent, 15-25 parts of nano titanium dioxide, 5-10 parts of tetra-needle zinc oxide whiskers, and 1-5 parts of micro-nano diatomaceous earth.

2. The antibacterial composite material for high borosilicate glass as described in claim 1, characterized in that, The semi-aromatic nylon is at least one of PA6T, PA6I, PA6T / 6I, PA6T / 6I / 12, PA9T, PA10T, PA12T, and MXD6.

3. The antibacterial composite material for high borosilicate glass as described in claim 1, characterized in that, The fiber-reinforced filler is at least one of glass fiber, carbon fiber, and natural fiber.

4. The antibacterial composite material for high borosilicate glass as described in claim 1, characterized in that, The toughening agent is at least one of maleic anhydride-grafted polystyrene, maleic anhydride-grafted polyethylene, maleic anhydride-grafted polypropylene, maleic anhydride-grafted polyphenylene ether, maleic anhydride-grafted polyphenylene sulfide, maleic anhydride-grafted ethylene octene copolymer, and maleic anhydride-grafted ethylene propylene diene monomer (EPDM) rubber.

5. The antibacterial composite material for high borosilicate glass as described in claim 1, characterized in that, The fiber-reinforced filler is glass fiber.

6. The antibacterial composite material for high borosilicate glass as described in claim 1, characterized in that, The antibacterial composite material for high borosilicate glass also includes other fillers, preferably 1-20 parts of the filler.

7. The antibacterial composite material for high borosilicate glass as described in claim 6, characterized in that, The filler is at least one of antioxidants, coupling agents, light stabilizers, water-resistant agents, colorants, flame retardants, lubricants, plasticizers, and flow modifiers; preferably, the filler is at least one of antioxidants, coupling agents, lubricants, and plasticizers.

8. The antibacterial composite material for high borosilicate glass as described in claim 1, characterized in that, It contains the following components in parts by weight: Semi-aromatic nylon 85-95 parts, fiber-reinforced filler 10-15 parts, toughening agent 12-17 parts, nano titanium dioxide 15-20 parts, tetra-needle zinc oxide whiskers 6-9 parts, micro-nano diatomaceous earth 2-4 parts.

9. The method for preparing the antibacterial composite material for high borosilicate glass as described in claim 1, characterized in that, Includes the following steps: (1) Mix semi-aromatic nylon, toughening agent, nano titanium dioxide, tetra-needle zinc oxide whiskers and micro-nano diatomaceous earth evenly to obtain a premix; (2) The premixed material is added to the twin-screw extruder from the main feed port, and then the fiber-reinforced filler is added to the twin-screw extruder from the side feed port. The mixture is melted, extruded and granulated to obtain the antibacterial composite material for high borosilicate glass.

10. The method for preparing the antibacterial composite material for high borosilicate glass as described in claim 9, characterized in that, The twin-screw extruder has a screw speed of 400-600 r / min and an extrusion temperature of 270-330℃.

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