Material for full-plastic nose bridge strip of mask

Abstract

The invention belongs to the field of plastics. The invention relates to a material for an all-plastic nose bridge strip of a mask and a preparation method of the material. The material for the all-plastic nose bridge strip of the mask is prepared from the following raw materials in parts by weight: 60 to 70 parts of HDPE (High-Density Polyethylene), 10 to 20 parts of LLDPE (Linear Low Density Polyethylene), 4.0 to 8.0 parts of silicon rubber, 5.0 to 10.0 parts of filler, 1.0 to 1.5 parts of compatibilizer, 0.3 to 0.6 part of silane coupling agent, 0.3 to 1.0 part of antioxidant, 0.1 to 0.5 part of lubricant and 0.5 to 1.0 part of antistatic agent. The components are respectively subjected to processes of filler pretreatment, mixing, extrusion and granulation, and a specific side charging process is utilized to prepare the composite material. The novel material for the full-plastic nose bridge strip of the mask effectively solves the problems that the material for the full-plastic nose bridge strip of the mask in the prior art is poor in shaping property and poor in bending frequency.

Description

Technical Field

[0001] The invention relates to a material for a full-plastic nose bridge of a mask and a preparation method thereof. The invention belongs to the field of plastics. Background Art

[0002] The nose bridge of the mask mainly plays the role of fixing the mask on the bridge of the nose. In order to achieve a good fixing effect and a good fit with the nose, the material used to make the nose bridge is required to have good ductility, toughness and shape plasticity. At present, the materials used to make the nose bridge of the mask on the market mainly include: metal aluminum strips, metal iron wires, and plastic-coated metal iron wires. Since masks are usually made of polyolefin materials, the existence of nose bridge strips made of all or part of metal will bring great trouble to the environmental protection recycling and reuse of discarded masks. The all-plastic nose bridge strip can solve the problems of the above-mentioned metal products, and at the same time has incomparable practical advantages such as recyclability, environmental protection, and safe use. At present, the base material used in the production of all-plastic nose bridge strips is mainly high-density polyethylene (HDPE). HDPE is a highly crystalline and non-polar thermoplastic resin with good heat resistance and cold resistance, good chemical stability, and high rigidity and toughness.

[0003] However, all-plastic nose strips also have some problems. For example, the all-plastic nose strips on the market are mainly made of a single modified polypropylene or modified polyethylene material, which has problems such as being difficult to press, unsatisfactory shaping effect, and poor wear resistance. In addition, due to the high crystallinity of HDPE, it is easy to crystallize during the stretching process and is prone to breakage, which affects the service life of the material.

[0004] In view of the above-mentioned practical problems, it is of great significance to prepare a mask full-plastic nose bridge material with good shaping property. Summary of the invention

[0005] The purpose of the present invention is to provide a new type of all-plastic nose bridge material for masks and a preparation method thereof, in view of the problems of poor shaping and easy breakage of all-plastic nose bridge materials for masks in the prior art. Through formula design optimization, while solving the problem of poor shaping, it also has excellent mechanical properties. The technical solution adopted by the present invention to solve its technical problems is: The present invention provides a material for a full-plastic nose bridge of a mask, comprising the following raw materials in parts by weight: HDPE 60-70 parts; LLDPE 10-20 parts; Silicone rubber 4.0-8.0 parts; Filler 5.0-10.0 parts; 1.0-1.5 parts of compatibilizer; Silane coupling agent 0.3-0.6 parts; Antioxidant 0.3-1.0 part; Lubricant 0.1-0.5 parts; Antistatic agent 0.5-1.0 part; The melt index of the HDPE is 0.1-0.3 g / 10 min, under the test conditions of 190°C / 2.16 kg; The LLDPE is 0.8-1.0g / 10min, 190°C / 2.16kg under the test conditions; The filler is a mixture of a spherical structure filler and a lamellar structure filler in a mass ratio of 1:1.0-3.0; The spherical structure filler is a mixture of an organic spherical filler and an inorganic spherical filler in a mass ratio of 1.0-2.0:1, and the particle size is 1-10 μm; and The particle size of the lamellar structure filler is 1000-3000 meshes.

[0006] Furthermore, the silicone rubber is gas phase silicone rubber.

[0007] Furthermore, the organic spherical filler is PMMA microbeads modified with amino or carboxyl groups; The inorganic spherical filler is silicon dioxide, calcium carbonate or barium sulfate; and The lamellar structure filler is talcum powder or graphene oxide.

[0008] Furthermore, the compatibilizer is ethylene-glycidyl methacrylate copolymer or ethylene-acrylate-glycidyl methacrylate terpolymer.

[0009] Furthermore, the silane coupling agent is a vinyl silane coupling agent or an acryloxy silane coupling agent.

[0010] Furthermore, the antioxidant is a mixture of a hindered phenol antioxidant and a phosphite antioxidant in a mass ratio of 1:2-4.

[0011] The present invention also provides a method for preparing a material for a full-plastic nose bridge of a mask, comprising the following steps: S11, filler pretreatment, i.e. The inorganic spherical filler, lamellar structure filler and coupling agent in the filler are subjected to surface treatment; S12, mixing; Add the filler pretreated with S11, organic spherical filler, LLDPE, silicone rubber, compatibilizer, antioxidant, lubricant and antistatic agent into a mixer and mix evenly; S13, extrusion; The mixed material in S12 is added from the main feeding port of the extruder, and HDPE is added from the side feeding port for melt blending and extrusion; S14, granulation; The melt in S13 is subjected to strip drawing, air cooling and pelletizing to obtain the material for the full-plastic nose bridge of the mask.

[0012] Further, the extruder has a screw aspect ratio of 50-60:1 and a rotation speed of 300-400 rpm; and The temperatures of the screw sections of the extruder are: the temperature of zone 1 is 160-180°C, the temperature of zone 2 is 170-185°C, the temperature of zone 3 is 185-195°C, the temperature of zone 4 is 185-195°C, the temperature of zone 5 is 190-200°C, the temperature of zone 6 is 195-205°C, the temperature of zone 7 is 195-205°C, the temperature of zone 8 is 200-210°C, the temperature of zone 9 is 200-210°C, the temperature of zone 10 is 205-215°C, the temperature of zone 11 is 205-215°C; the temperature of zone 12 is 205-215°C.

[0013] Furthermore, the side feeding port is located in the third zone or the fourth zone of the extruder.

[0014] Beneficial effects of the present invention: (1) The present invention provides a material for a full-plastic nose bridge of a mask, wherein the formula system is mainly composed of HDPE with a low melt index, and is blended with LLDPE to form the main resin component. First, HDPE with a low melt index and a small range usually has a higher molecular weight and a narrower molecular weight distribution width, and has excellent properties such as breaking strength, hardness, and toughness; at the same time, the material performance is highly stable; second, LLDPE has excellent toughness and tear resistance, and can increase the bending frequency, elongation at break, etc.; at the same time, LLDPE also has better fluidity, which has a positive effect on the molding and processing of the material; third, HDPE and LLDPE have excellent compatibility, and during the high tensile orientation process, the molecular chain forms a fibrous structure along the force direction, which is easy to form crystals, which is beneficial to improving the shaping of the material.

[0015] (2) The present invention provides a material for a full-plastic nose bridge of a mask, wherein the filler in the formula system is a compound of a spherical structure and a lamellar structure, and the spherical structure filler is a mixture of organic and inorganic structures. First, after surface treatment, the filler has a cross-linking effect, which can improve the mechanical properties; second, during the high-stretch orientation process, the filler can offset the weak elastic stress remaining inside the material, reduce the rebound angle, and improve the shaping property; third, during the stretch orientation process, the lamellar structure of the lamellar structure filler will slip along the direction of the force, and has excellent ductility. At the same time, after bending, there is a lack of sufficient molecular chain movement rebound between the lamellar structure fillers, and the rebound rotation potential energy of the lamellar structure is large, which can further improve the shaping property of the material; fourth, the spherical structure filler can improve the wear resistance and scratch resistance of the material; fifth, the organic spherical structure filler is compatible with the compatibilizer reaction to form a "beaded" structure, which can form a large chain entanglement with the system, delay the formation of silver streaks, and improve the mechanical properties; sixth, the filler can act as a heterogeneous nucleating agent for HDPE to promote rapid crystallization and shaping; finally, the fillers work synergistically with each other to improve the mechanical properties, wear resistance and shaping properties of the material.

[0016] (3) The present invention provides a method for preparing a material for a full plastic nose bridge of a mask. Through a side feeding melt extrusion process, a raw material mixture other than HDPE is added from a main feeding port for effective compatibility, and then HDPE enters a screw through a side feeding port, and is sheared, dispersed, melted, and extruded by an ultra-long aspect ratio screw. On the one hand, the over-shearing of HDPE is reduced, resulting in a wide molecular weight distribution, and deterioration of mechanical properties and crystallization properties; on the other hand, the other components can be fully mixed and melted, effectively improving the dispersibility of each component, thereby improving mechanical properties, etc. DETAILED DESCRIPTION

[0017] The present invention is described in detail below with reference to the examples. However, it should be understood that the following examples are only illustrative of the embodiments of the present invention, and are not intended to limit the scope of the present invention.

[0018] The purpose of the present invention is to develop a high-performance all-plastic nose bridge material for masks in view of the problem of poor shaping of all-plastic nose bridge materials in the prior art. The idea of ​​implementation is: clarifying the theoretical reason for the poor shaping of all-plastic nose bridge materials for masks is that when the HDPE material is bent, the movement of the macromolecular chain is restored, resulting in residual weak elastic stress inside; considering that the problem of poor shaping is the result of the movement of the macromolecular chain segments, it can be solved through formula design optimization; first, starting from the main component of the formula HDPE, through the selection of low melt index HDPE and LLDPE for compounding, the number of bending times is increased; second, on the one hand, the shaping of the material is improved by the use of fillers, and the isolated structure of the filler can effectively block the movement of the macromolecular chain segments and effectively offset the residual elastic stress; on the other hand, the organic spherical structure filler is formed into a "beaded" structure through a compatibilizer, and the inorganic spherical structure filler and the cross-linked structure after surface treatment The effects can effectively improve the mechanical properties and the number of bending times, and the spherical structure filler also has excellent wear resistance; the lamellar structure filler has ductility, which has a significant effect on the shaping of the material; in addition, the selection of appropriate particle size can be used as a nucleating agent for HDPE crystallization to further improve the shaping, mechanical properties, etc.; third, through the compounding of suitable antioxidants, it plays an important role in the appearance and mechanical properties of the material; fourth, silicone rubber can effectively improve toughness, increase the number of bending times and wear resistance; fifth, through the synergistic effect of various components such as compatibilizers, antistatic agents and other additives, the comprehensive performance is improved; finally, through an ultra-long aspect ratio twin-screw and a side feeding process for extrusion granulation, the target material is obtained, which can solve the problems of poor shaping and poor bending times of the material used for the full plastic nose bridge of the mask. The embodiments of the present invention are as follows: The embodiment of the present invention provides a material for a full-plastic nose bridge of a mask, comprising the following raw materials in parts by weight: HDPE 60-70 parts; LLDPE 10-20 parts; Silicone rubber 4.0-8.0 parts; Filler 5.0-10.0 parts; 1.0-1.5 parts of compatibilizer; Silane coupling agent 0.3-0.6 parts; Antioxidant 0.3-1.0 part; Lubricant 0.1-0.5 parts; Antistatic agent 0.5-1.0 part; The melt index of the HDPE is 0.1-0.3 g / 10 min under the test conditions of 190°C / 2.16 kg; it can be 6100M (Yangzi Petrochemical), 6500B (Yangzi Petrochemical), TUB124N6000 (INEOS), North Star® FB3450 (Borouge), etc.; and the HDPE described in the following embodiments of the present invention is 6100M.

[0019] The LLDPE may be 7042 (Fushun Petrochemical), 7047 (Daqing Petrochemical) or the like under the test conditions of 0.8-1.0 g / 10 min and 190° C. / 2.16 kg. The LLDPE described in the following embodiments of the present invention is 7047.

[0020] The filler is a mixture of a spherical structure filler and a lamellar structure filler in a mass ratio of 1:1.0-3.0; The spherical structure filler is a mixture of an organic spherical filler and an inorganic spherical filler in a mass ratio of 1.0-2.0:1, and the particle size is 1-10 μm; this particle size range can promote the crystallization of HDPE and has the function of a nucleating agent; in addition, if the particle size is less than 1 μm, the inhibition of the elastic recovery of the material will be reduced, and the shaping property will be reduced; if the particle size is greater than 10 μm, defects will be formed during the stress stretching process, reducing the mechanical properties; The particle size of the lamellar structure filler is 1000-3000 meshes; if the particle size is less than 1000 meshes, defects will be formed during the stress stretching process, reducing the mechanical properties; if the particle size is greater than 3000 meshes, the effect of inhibiting the elastic recovery of the material will be significantly reduced, and the shaping property will be reduced.

[0021] The silicone rubber is a vapor phase silicone rubber, which can improve the toughness of the material and further improve the bending times, wear resistance, etc.; specifically, it can be R401 / 20S (Wacker, Germany), R401 / 30S (Wacker, Germany), etc., and the silicone rubber described in the following embodiments of the present invention is R401 / 20S.

[0022] The organic spherical filler is PMMA microbeads modified with amino or carboxyl groups; The amino-modified PMMA microbeads may be PMMAN1UM-10, PMMAN3UM-10, PMMAN5UM-10, PMMAN10UM-10, all of which are purchased from Taoyu Group; and the amino-modified PMMA microbeads described in the following embodiments of the present invention are PMMAN5UM-10 (5 μm); The carboxyl-modified PMMA microbeads may be PMMAC1UM-10, PMMAC2UM-10, PMMAC5UM-10, PMMAC10UM-10, all of which are purchased from Taoyu Group; and the carboxyl-modified PMMA microbeads described in the following embodiments of the present invention are PMMAC5UM-10 (5 μm).

[0023] The inorganic spherical filler is silicon dioxide, calcium carbonate or barium sulfate; The silicon dioxide described in the following examples of the present invention is Brofos-SiO2-W03 (3 μm) (Bohuasi Nanotechnology); The calcium carbonate described in the following examples of the present invention is MP-3 (3.5 μm) (Guangxi Warner New Materials) The barium sulfate described in the following embodiments of the present invention is G-065 (5.5 μm) (Qingdao Yilite Chemical Technology).

[0024] The lamellar structure filler is talcum powder or graphene oxide; The talcum powder described in the following embodiments of the present invention is plastic-grade talcum powder (Guangxi Longsheng Huamei); The graphene oxide described in the following examples of the present invention is graphene oxide prepared by improving Hummer's method; The graphene oxide raw material, graphene model is SE1233-S (Changzhou Sixth Element).

[0025] The compatibilizer is ethylene-glycidyl methacrylate copolymer or ethylene-acrylate-glycidyl methacrylate terpolymer; The ethylene-glycidyl methacrylate copolymer may be Igetabond™ BF-E (Sumitomo, Japan), etc. The ethylene-acrylate-glycidyl methacrylate terpolymer may be LOTADER ® AX8900 (Arkema, France), etc.

[0026] The silane coupling agent is a vinyl silane coupling agent or an acryloxy silane coupling agent; The vinyl silane coupling agent may be KH151, KH171, KH172 or KH173, etc., and KH171 is preferred.

[0027] The acryloxysilane coupling agent may be KH570, KH571, KH670 or GX572, etc., and KH570 is preferred.

[0028] The antioxidant is a mixture of a hindered phenol antioxidant and a phosphite antioxidant in a mass ratio of 1:2-4; The hindered phenol antioxidant may be antioxidant 1010, antioxidant 1076, antioxidant 264, antioxidant 2246, etc.; and antioxidant 1010 is preferred.

[0029] The phosphite antioxidant may be antioxidant 168, antioxidant 242, antioxidant TPP, etc.; and antioxidant 168 is preferred.

[0030] The lubricant may be PE wax, zinc stearate, calcium stearate, EBS or PETS, etc.; the lubricant in the following embodiments of the present invention is calcium stearate; calcium stearate also has a certain nucleating agent effect, which improves the crystallinity of HDPE materials and improves performance.

[0031] The antistatic agent can reduce the surface resistance of the material, reduce adverse consequences such as fire caused by static electricity, and has a positive effect on production and downstream use; specifically, it can be MV1074 SA01 (Arkema), MH1657 (Arkema), A4-88 (Zhejiang Jiahua Fine Chemical), etc.; and, the antistatic agent described in the following embodiments of the present invention is MV1074 SA01.

[0032] The embodiment of the present invention also provides a method for preparing a material for a full-plastic nose bridge of a mask, comprising the following steps: S11, filler pretreatment, i.e. The inorganic spherical filler, lamellar structure filler and coupling agent in the filler are added to the ethanol solvent, ultrasonically vibrated for 0.5 hours, reacted at 60°C for 5 hours, filtered, the insoluble matter was taken, and dried at 60°C for 6 hours to obtain the pretreated filler; The usage ratio of the silane coupling agent to the ethanol solvent is 1g:500mL.

[0033] S12, mixing; The filler pretreated with S11, the organic spherical filler, LLDPE, silicone rubber, a compatibilizer, an antioxidant, a lubricant, and an antistatic agent were added into a mixer and stirred at a stirring rate of 800 r / min for 10 minutes.

[0034] S13, extrusion; The mixed material in S12 is added from the main feeding port of the extruder, and HDPE is added from the side feeding port for melt blending and extrusion; The extruder has a screw length-to-diameter ratio of 50-60:1 and a rotation speed of 300-400 rpm; and The temperatures of the screw sections of the extruder are: the temperature of zone 1 is 160-180°C, the temperature of zone 2 is 170-185°C, the temperature of zone 3 is 185-195°C, the temperature of zone 4 is 185-195°C, the temperature of zone 5 is 190-200°C, the temperature of zone 6 is 195-205°C, the temperature of zone 7 is 195-205°C, the temperature of zone 8 is 200-210°C, the temperature of zone 9 is 200-210°C, the temperature of zone 10 is 205-215°C, the temperature of zone 11 is 205-215°C; the temperature of zone 12 is 205-215°C.

[0035] The side feed port is located in the third zone or the fourth zone of the extruder.

[0036] S14, granulation; The melt in S13 is subjected to strip drawing, air cooling, pelletizing and packaging to obtain the material for the full-plastic nose bridge of the mask.

[0037] In order to further understand the present invention, a material for a full-plastic nose bridge strip of a mask provided by the present invention is described in detail below in conjunction with specific embodiments, and the protection scope of the present invention is not limited by the following embodiments.

[0038] A material for a full-plastic nose bridge of a mask, comprising the following raw materials in parts by weight: HDPE 65 parts; LLDPE 15 parts; Silicone rubber 6.0 parts; Filler 8.0 parts; Compatibilizer LOTADER ® AX8900 1.2 copies; Silane coupling agent KH570 0.5 parts; 0.6 parts of antioxidant; 0.3 parts of lubricant; 0.8 parts of antistatic agent; The filler is a mixture of a spherical structure filler and a lamellar structure filler in a mass ratio of 1:2.0; The spherical structure filler is a mixture of organic spherical filler and inorganic spherical filler in a mass ratio of 1.5:1; The organic spherical filler is amino-modified PMMA microbeads; The inorganic spherical filler is silicon dioxide; The lamellar structure filler is talcum powder.

[0039] The antioxidant is a mixture of antioxidant 1010 and antioxidant 168 in a mass ratio of 1:3.

[0040] A method for preparing a material for a full-plastic nose bridge of a mask, comprising the following steps: S11, filler pretreatment, i.e. The inorganic spherical filler, lamellar structure filler and coupling agent in the filler are added to the ethanol solvent, ultrasonically vibrated for 0.5 hours, reacted at 60°C for 5 hours, filtered, the insoluble matter was taken, and dried at 60°C for 6 hours to obtain the pretreated filler; The usage ratio of the silane coupling agent to the ethanol solvent is 1g:500mL.

[0041] S12, mixing; The filler pretreated with S11, the organic spherical filler, LLDPE, silicone rubber, a compatibilizer, an antioxidant, a lubricant, and an antistatic agent were added into a mixer and stirred at a stirring rate of 800 r / min for 10 minutes.

[0042] S13, extrusion; The mixed material in S12 is added from the main feeding port of the extruder, and HDPE is added from the side feeding port for melt blending and extrusion; The extruder has a screw length-to-diameter ratio of 60:1 and a screw speed of 358 rpm; and The temperatures of the screw sections of the extruder are: 170°C in zone 1, 180°C in zone 2, 190°C in zone 3, 192°C in zone 4, 195°C in zone 5, 199°C in zone 6, 201°C in zone 7, 205°C in zone 8, 207°C in zone 9, 210°C in zone 10, 212°C in zone 11; and 212°C in zone 12.

[0043] The side feed port is located in the fourth zone of the extruder.

[0044] S14, granulation; The melt in S13 is subjected to strip drawing, air cooling, pelletizing and packaging to obtain the material for the full-plastic nose bridge of the mask.

[0045] A material for a full-plastic nose bridge of a mask, comprising the following raw materials in parts by weight: HDPE 70 parts; LLDPE 10 parts; Silicone rubber 8.0 parts; Filler 10.0 parts; Compatibilizer LOTADER ® AX8900 1.5 copies; Silane coupling agent KH570 0.6 parts; 0.3 parts of antioxidant; 0.5 parts of lubricant; 0.5 parts of antistatic agent; The filler is a mixture of a spherical structure filler and a lamellar structure filler in a mass ratio of 1:2.0; The spherical structure filler is a mixture of organic spherical filler and inorganic spherical filler in a mass ratio of 1.5:1; The organic spherical filler is amino-modified PMMA microbeads; The inorganic spherical filler is silicon dioxide; The lamellar structure filler is talcum powder.

[0046] The antioxidant is a mixture of antioxidant 1010 and antioxidant 168 in a mass ratio of 1:3.

[0047] A method for preparing a material for a full-plastic nose bridge of a mask, comprising the following steps: S11, filler pretreatment, i.e. The inorganic spherical filler, lamellar structure filler and coupling agent in the filler are added to the ethanol solvent, ultrasonically vibrated for 0.5 hours, reacted at 60°C for 5 hours, filtered, the insoluble matter was taken, and dried at 60°C for 6 hours to obtain the pretreated filler; The usage ratio of the silane coupling agent to the ethanol solvent is 1g:500mL.

[0048] S12, mixing; The filler pretreated with S11, the organic spherical filler, LLDPE, silicone rubber, a compatibilizer, an antioxidant, a lubricant, and an antistatic agent were added into a mixer and stirred at a stirring rate of 800 r / min for 10 minutes.

[0049] S13, extrusion; The mixed material in S12 is added from the main feeding port of the extruder, and HDPE is added from the side feeding port for melt blending and extrusion; The extruder has a screw length-to-diameter ratio of 60:1 and a screw speed of 304 rpm; and The temperatures of the screw sections of the extruder are: 180°C in zone 1, 185°C in zone 2, 192°C in zone 3, 195°C in zone 4, 200°C in zone 5, 205°C in zone 6, 205°C in zone 7, 208°C in zone 8, 210°C in zone 9, 213°C in zone 10, 215°C in zone 11; and 215°C in zone 12.

[0050] The side feed port is located in the third zone of the extruder.

[0051] S14, granulation; The melt in S13 is subjected to strip drawing, air cooling, pelletizing and packaging to obtain the material for the full-plastic nose bridge of the mask.

[0052] A material for a full-plastic nose bridge of a mask, comprising the following raw materials in parts by weight: HDPE 60 parts; LLDPE 20 parts; Silicone rubber 4.0 parts; Filler 5.0 parts; Compatibilizer LOTADER ® AX8900 1.0 copy; Silane coupling agent KH570 0.3 parts; 1.0 part of antioxidant; Lubricant 0.1 part; 1.0 part of antistatic agent; The filler is a mixture of a spherical structure filler and a lamellar structure filler in a mass ratio of 1:2.0; The spherical structure filler is a mixture of organic spherical filler and inorganic spherical filler in a mass ratio of 1.5:1; The organic spherical filler is amino-modified PMMA microbeads; The inorganic spherical filler is silicon dioxide; The lamellar structure filler is talcum powder.

[0053] The antioxidant is a mixture of antioxidant 1010 and antioxidant 168 in a mass ratio of 1:3.

[0054] A method for preparing a material for a full-plastic nose bridge of a mask, comprising the following steps: S11, filler pretreatment, i.e. The inorganic spherical filler, lamellar structure filler and coupling agent in the filler are added to the ethanol solvent, ultrasonically vibrated for 0.5 hours, reacted at 60°C for 5 hours, filtered, the insoluble matter was taken, and dried at 60°C for 6 hours to obtain the pretreated filler; The usage ratio of the silane coupling agent to the ethanol solvent is 1g:500mL.

[0055] S12, mixing; The filler pretreated with S11, the organic spherical filler, LLDPE, silicone rubber, a compatibilizer, an antioxidant, a lubricant, and an antistatic agent were added into a mixer and stirred at a stirring rate of 800 r / min for 10 minutes.

[0056] S13, extrusion; The mixed material in S12 is added from the main feeding port of the extruder, and HDPE is added from the side feeding port for melt blending and extrusion; The extruder has a screw length-to-diameter ratio of 60:1 and a screw speed of 398 rpm; and The temperatures of the screw sections of the extruder are: 160°C in zone 1, 170°C in zone 2, 185°C in zone 3, 188°C in zone 4, 190°C in zone 5, 195°C in zone 6, 197°C in zone 7, 200°C in zone 8, 202°C in zone 9, 205°C in zone 10, 205°C in zone 11; and 205°C in zone 12.

[0057] The side feed port is located in the fourth zone of the extruder.

[0058] S14, granulation; The melt in S13 is subjected to strip drawing, air cooling, pelletizing and packaging to obtain the material for the full-plastic nose bridge of the mask.

[0059] The rest is the same as in Example 1, except that: In a material formula for a full plastic nose bridge of a mask, The filler is a mixture of a spherical structure filler and a lamellar structure filler in a mass ratio of 1:1.0.

[0060] The rest is the same as in Example 1, except that: In a material formula for a full plastic nose bridge of a mask, The filler is a mixture of a spherical structure filler and a lamellar structure filler in a mass ratio of 1:3.0.

[0061] The rest is the same as in Example 1, except that: In a material formula for a full plastic nose bridge of a mask, The spherical structure filler is a mixture of an organic spherical filler and an inorganic spherical filler in a mass ratio of 1.0:1.

[0062] The rest is the same as in Example 1, except that: In a material formula for a full plastic nose bridge of a mask, The spherical structure filler is a mixture of an organic spherical filler and an inorganic spherical filler in a mass ratio of 2.0:1.

[0063] The rest is the same as in Example 1, except that: In a material formula for a full plastic nose bridge of a mask, The antioxidant is a mixture of antioxidant 1010 and antioxidant 168 in a mass ratio of 1:2.

[0064] The rest is the same as in Example 1, except that: In a material formula for a full plastic nose bridge of a mask, The antioxidant is a mixture of antioxidant 1010 and antioxidant 168 in a mass ratio of 1:4.

[0065] The rest is the same as in Example 1, except that: In a material formula for a full plastic nose bridge of a mask, The inorganic spherical filler is calcium carbonate.

[0066] The rest is the same as in Example 1, except that: In a material formula for a full plastic nose bridge of a mask, The inorganic spherical filler is barium sulfate.

[0067] The rest is the same as in Example 1, except that: In a material formula for a full plastic nose bridge of a mask, The lamellar structure filler is graphene oxide.

[0068] The rest is the same as in Example 1, except that: In a material formula for a full plastic nose bridge of a mask, The organic spherical filler is carboxyl-modified PMMA microbeads.

[0069] The rest is the same as in Example 1, except that: In a material formula for a full plastic nose bridge of a mask, The compatibilizer LOTADER ® AX8900 was replaced with Igetabond™ BF-E.

[0070] The rest is the same as in Example 1, except that: In a material formula for a full plastic nose bridge of a mask, The silane coupling agent KH570 was replaced with silane coupling agent KH171.

[0071] The rest is the same as in Example 1, except that: A method for preparing a material for a full-plastic nose bridge of a mask, wherein in S13, The extruder has a screw length-to-diameter ratio of 50:1 and a screw speed of 358 rpm; and The side feed port is located in the third zone of the extruder.

[0072] The following comparative examples are compared with specific embodiment 1: Comparative Example 1 The rest is the same as in Example 1, except that: In a material formula for a full plastic nose bridge of a mask, HDPE 6100M was replaced by HDPE 5000S (melt index 0.9 g / 10 min).

[0073] Comparative Example 2 The rest is the same as in Example 1, except that: A material for a full-plastic nose bridge of a mask, comprising the following raw materials in parts by weight: HDPE 80 parts; Silicone rubber 6.0 parts; Filler 8.0 parts; Compatibilizer LOTADER ® AX8900 1.2 copies; Silane coupling agent KH570 0.5 parts; 0.6 parts of antioxidant; 0.3 parts of lubricant; 0.8 parts of antistatic agent.

[0074] Comparative Example 3 The rest is the same as in Example 1, except that: In a material formula for a full plastic nose bridge of a mask, The spherical structure filler is a mixture of an organic spherical filler and an inorganic spherical filler in a mass ratio of 0:1; that is, no organic spherical filler is added.

[0075] Comparative Example 4 The rest is the same as in Example 1, except that: In a material formula for a full plastic nose bridge of a mask, The spherical structure filler is a mixture of an organic spherical filler and an inorganic spherical filler in a mass ratio of 1.5:0; that is, no inorganic spherical filler is added.

[0076] Comparative Example 5 The rest is the same as in Example 1, except that: In a material formula for a full plastic nose bridge of a mask, The filler is a mixture of a spherical structure filler and a lamellar structure filler at a mass ratio of 0:2.0; that is, no spherical structure filler is added.

[0077] Comparative Example 6 The rest is the same as in Example 1, except that: In a material formula for a full plastic nose bridge of a mask, The filler is a mixture of a spherical structure filler and a lamellar structure filler in a mass ratio of 1:0; that is, no lamellar structure filler is added.

[0078] Comparative Example 7 The rest is the same as in Example 1, except that: In a material formula for a full plastic nose bridge of a mask, The particle size of the spherical structure filler is 20-25 μm; The organic spherical filler is amino-modified PMMA microbeads, model PMMAN20UM-10 (Taoyu Group), with a particle size of 20 μm; The inorganic spherical filler is silicon dioxide, model Brofos-SiO2-W25 (Bohuasi Nanotechnology), particle size 25 μm; The lamellar structure filler is plastic-grade talcum powder (Guangxi Longsheng Huamei) with a particle size of 600 meshes.

[0079] Comparative Example 8 The rest is the same as in Example 1, except that: No compatibilizer is added to the material formula of a full-plastic nose bridge of a mask.

[0080] Comparative Example 9 The rest is the same as in Example 1, except that: No coupling agent is added to the material formula of a mask full plastic nose bridge.

[0081] Comparative Example 10 The rest is the same as in Example 1, except that: In a material formula for a full plastic nose bridge of a mask, The antioxidant is a mixture of antioxidant 1010 and antioxidant 168 in a mass ratio of 1:0; that is, antioxidant 168 is not added.

[0082] Comparative Example 11 The rest is the same as in Example 1, except that: In a material formula for a full plastic nose bridge of a mask, The antioxidant is a mixture of antioxidant 1010 and antioxidant 168 at a mass ratio of 0:3; that is, antioxidant 1010 is not added.

[0083] Comparative Example 12 The rest is the same as in Example 1, except that: A method for preparing a material for a full-plastic nose bridge of a mask, in step S11, No pretreatment of the filler was performed.

[0084] Comparative Example 13 The rest is the same as in Example 1, except that: A method for preparing a material for a full-plastic nose bridge of a mask, in step S13, All raw materials are added from the main feeding port for extrusion.

[0085] The physical properties of the full-plastic nose bridge strips of masks prepared in the embodiments of the present invention and the comparative examples were respectively measured by extrusion molding using an extruder, and the results are shown in Table 1.

[0086] First, it can be concluded from Examples 1-16 in Table 1 that the material for the all-plastic nose bridge of the mask of the present invention has excellent appearance, mechanical properties, number of bending times and shaping properties (small rebound angle), etc.

[0087] Second, it can be observed from Example 1 and Comparative Examples 1-2 that the use of suitable HDPE and LLDPE in the material for the all-plastic nose bridge of the mask in the present invention has a synergistic effect, improving the mechanical properties and the number of bending times; it can be observed from Example 1 and Comparative Examples 3-7 that the spherical structure filler focuses on improving the mechanical properties, the sheet structure filler focuses on improving the shaping, the organic / inorganic structure, the spherical / sheet structure synergistic effect and the suitable particle size range have the effect of improving the mechanical properties, the number of bending times and the shaping; it can be observed from Example 1 and Comparative Examples 8-9 that the coupling agent and the compatibilizer have a positive effect on the mechanical properties and the number of bending times of the material; it can be observed from Example 1 and Comparative Examples 10-11 that the compounded antioxidant has a significant significance for the antioxidant property of the material; it can be observed from Example 1 and Comparative Examples 12-13 that the pretreatment of the filler (mainly promoting the compatibility of the filler with the organic matrix) and the side feeding process (reducing the over-shear degradation performance of HDPE and reserving time for complete blending of other raw materials) play an important role in improving the comprehensive performance of the material.

[0088] In summary, the material for the full-plastic nose bridge of the mask of the present invention has excellent appearance, excellent mechanical strength, bending times and shaping properties (small rebound angle) through formula design and process design optimization, and has great practical significance.

[0089] The test method is as follows: (1) Extrusion state and appearance: Visually inspect the extrusion state of the specimen and the appearance of the pellets during the production process.

[0090] (2) Mechanical properties: The test was carried out according to the method described in GB / T1040.3-2006; the tensile rate was 500 mm / min.

[0091] (3) Number of folds: Pinch the 10-cm-long nose bridge strip with both hands on both sides and fold it in half continuously. Record the number of folds when it breaks.

[0092] (4) Rebound angle: that is, the rebound angle of the folded nose strip. Use a specified mold (bending angle of 135°) to fold a finished nose strip with a length of 8 cm, hold it for 10 seconds and then release it. After the finished nose strip is left to stand for 1 minute, use a protractor to test its angles before and after shaping. The experimental conditions are temperature (23±2)℃ and relative humidity (50±10)%.

[0093] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A material for a full plastic nose bridge of a mask, characterized in that: The invention comprises the following raw materials in parts by weight: HDPE 60-70 parts; LLDPE 10-20 parts; Silicone rubber 4.0-8.0 parts; Filler 5.0-10.0 parts; 1.0-1.5 parts of compatibilizer; Silane coupling agent 0.3-0.6 parts; Antioxidant 0.3-1.0 part; Lubricant 0.1-0.5 parts; Antistatic agent 0.5-1.0 part; The melt index of the HDPE is 0.1-0.3 g / 10 min, under the test conditions of 190°C / 2.16 kg; The LLDPE is 0.8-1.0g / 10min, 190°C / 2.16kg under the test conditions; The filler is a mixture of a spherical structure filler and a lamellar structure filler in a mass ratio of 1:1.0-3.0; The spherical structure filler is a mixture of an organic spherical filler and an inorganic spherical filler in a mass ratio of 1.0-2.0:1, and the particle size is 1-10 μm; and The particle size of the lamellar structure filler is 1000-3000 meshes.

2. A mask all-plastic nose bridge material according to claim 1, characterized in that: The silicone rubber is a gas phase silicone rubber.

3. A mask all-plastic nose bridge material according to claim 1, characterized in that: The organic spherical filler is PMMA microbeads modified with amino or carboxyl groups; The inorganic spherical filler is silicon dioxide, calcium carbonate or barium sulfate; and The lamellar structure filler is talcum powder or graphene oxide.

4. A mask all-plastic nose bridge material according to claim 1, characterized in that: The compatibilizer is ethylene-glycidyl methacrylate copolymer or ethylene-acrylate-glycidyl methacrylate terpolymer.

5. A mask all-plastic nose bridge material according to claim 1, characterized in that: The silane coupling agent is a vinyl silane coupling agent or an acryloxy silane coupling agent.

6. A mask all-plastic nose bridge material according to claim 1, characterized in that: The antioxidant is a mixture of a hindered phenol antioxidant and a phosphite antioxidant in a mass ratio of 1:2-4.

7. A method for preparing a material for a full plastic nose bridge of a mask, characterized in that: The following steps are involved: S11, filler pretreatment, i.e. The inorganic spherical filler, lamellar structure filler and coupling agent in the filler are subjected to surface treatment; S12, mixing; Add the filler pretreated with S11, organic spherical filler, LLDPE, silicone rubber, compatibilizer, antioxidant, lubricant and antistatic agent into a mixer and mix evenly; S13, extrusion; The mixed material in S12 is added from the main feeding port of the extruder, and HDPE is added from the side feeding port for melt blending and extrusion; S14, granulation; The melt in S13 is subjected to strip drawing, air cooling and pelletizing to obtain the material for the full-plastic nose bridge of the mask.

8. The preparation method according to claim 7, characterized in that: The extruder has a screw length-to-diameter ratio of 50-60:1 and a rotation speed of 300-400 rpm; and The temperatures of the screw sections of the extruder are: the temperature of zone 1 is 160-180°C, the temperature of zone 2 is 170-185°C, the temperature of zone 3 is 185-195°C, the temperature of zone 4 is 185-195°C, the temperature of zone 5 is 190-200°C, the temperature of zone 6 is 195-205°C, the temperature of zone 7 is 195-205°C, the temperature of zone 8 is 200-210°C, the temperature of zone 9 is 200-210°C, the temperature of zone 10 is 205-215°C, the temperature of zone 11 is 205-215°C; the temperature of zone 12 is 205-215°C.

9. The preparation method according to claim 7, characterized in that: The side feed port is located in the third zone or the fourth zone of the extruder.

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