Strong buckle-type high-rigidity polymer water bottle cap based on inner and outer covers and preparation method thereof

Abstract

The present invention relates to a high-rigidity polymer water bottle cap based on a strong buckle type of inner and outer covers and a preparation method thereof. The invention is designed to solve the technical problems of the existing similar products that are relatively inconvenient to produce and assemble, difficult to automate and assemble, and have a relatively simple structure. The bottle cap comprises an outer cover, an inner cover and a gasket. The inner cover is buckled and fixed inside the outer cover. An inner thread is provided in the cover opening of the outer cover. A thorn portion extending from the inner top center of the inner cover is provided. The key points are that an outer edge of the cover opening of the inner cover is provided with an outer ring that protrudes upwards, and a side opening of the outer ring is provided with a side groove. The inner diameter of the cover opening of the outer cover corresponding to the side groove is provided with a raised limit block, and a side opening is provided on one side of the raised top ring of the inner cover. The side groove of the outer ring of the inner cover is fitted on the limit block of the outer cover. At the same time, the outer ring of the inner cover is fixed to the inner diameter of the cover opening of the outer cover by dispensing glue, ultrasonic welding or toothed rib ring and connected as a whole. The top ring of the inner cover is against the inner top of the outer cover.

Description

Technical Field

[0001] The invention relates to a bottle cap for cosmetics, in particular to a high-rigidity polymer water bottle cap based on a strong buckle type of inner and outer covers and a preparation method thereof. Background Art

[0002] A bottle cap is a sealing member used to seal containers such as bottles. Depending on their function, they come in different shapes and operate in different ways. For example, mineral water bottle caps are round and screw on, while can caps are ring-shaped and pull on. Cosmetic bottle caps typically use internal and external threads to tighten. Vacuum flasks in cosmetics are containers that isolate gases from the outside temperature or bacteria. Commercially available vacuum flasks consist of a cylindrical or ellipsoidal container with a piston at the bottom. A cream jar in cosmetics is a bottle used to store and access moisturizers. The body and cap of such bottles are typically made of plastic, with the internal threads on the cap and the external threads on the bottle mouth forming a threaded connection. Before use, these cosmetics typically have a sealing cap at the bottle mouth. After opening the bottle cap, the cap must be torn off before the paste or liquid inside can be used. To facilitate opening, some bottle caps feature a puncture mechanism, such as the utility model design described in Chinese patent application No. 202321750522.4, published on January 26, 2024, titled "A Container with a Replaceable Liner." Another example is the utility model design described in Chinese patent application No. 202310713579.5, published on September 19, 2023, titled "Pull-Off Cap with a Breakaway Flap." Still others, such as the utility model design described in Chinese patent application No. 202310485634.X, published on July 4, 2023, titled "Bottle Cap and Container." However, these and similar products are difficult to manufacture and assemble, are difficult to automate, and have relatively simple structures. Summary of the Invention

[0003] To overcome the above-mentioned shortcomings, the present invention aims to provide a high-rigidity polymer water bottle cap with an external spring and a strong buckle-type inner and outer cover, and a method for preparing the same, to address the technical problems of existing similar products, such as the inconvenience of production and assembly, the difficulty of automated assembly, and the relatively simple structure. This objective is achieved through the following technical solution.

[0004] A high-rigidity polymer water bottle cap based on a strong buckle type with inner and outer covers, the bottle cap comprises an outer cover, an inner cover and a gasket, the inner cover is buckled and fixed inside the outer cover, the outer cover has an internal thread inside the cover opening, and the inner top center of the inner cover has a spike portion extending out of the gasket inside the outer cover; the key points of its structural design are that the outer edge of the cover opening of the inner cover is provided with an upwardly protruding outer ring, one side of the outer ring is provided with a side groove, the inner diameter of the cover opening of the outer cover corresponding to the side groove is provided with a raised stopper, and one side of the raised top ring of the inner cover is provided with a side opening; the side groove of the outer ring of the inner cover is fitted with the stopper of the outer cover, the outer ring of the inner cover is fixed to the inner diameter of the cover opening of the outer cover by dispensing glue, ultrasonic welding or toothed rib ring and connected as a whole, and the top ring of the inner cover is abutted against the inner top of the outer cover. The spike portion of the inner cover can be broken after piercing the sealing cover at the bottle mouth of the bottle body as needed, or retained for continued use; because the stopper of the outer cover is fitted with the side groove of the inner cover, it is convenient for automated production and assembly.

[0005] The outer cover is in the shape of an inverted pyramid, and the top of the outer cover is arched. The shape of the outer cover is not limited to the inverted pyramid and the top arch, and can also be cylindrical. The inverted pyramid shape of the outer cover is easy to hold and rotate.

[0006] The inner thread of the inner cover is connected to the outer thread of the bottle mouth of the vacuum bottle assembly, or the outer thread of the bottle mouth of the cream bottle assembly, and the bottle mouths of the vacuum bottle assembly and the cream bottle assembly are respectively provided with sealing covers.

[0007] The vacuum bottle assembly and the cream bottle assembly are respectively provided with inner plugs at the inner diameter of the bottle mouth, the thorn part of the inner cover pierces the sealing cover, and the thorn part of the inner cover is sealed and inserted into the sealing hole of the inner plug.

[0008] The outer cover is sleeved with a fork, which is connected to the outer cover as a whole, and spiral rotation holes are symmetrically provided on both sides of the cylinder of the fork, and raised bead columns are symmetrically provided on the outer circumference of the outer ring of the inner cover, and the bead columns of the inner cover are respectively sleeved into the rotation holes on both sides of the fork; the inner diameter of the outer ring of the top of the inner cover is sleeved with a top cover, which is connected to the inner cover as a whole, and the top cover extends out of the outer cover, and a spring is provided on the top cover and the outer circumference of the fork in the outer cover, one end of the spring is against the top inside the outer cover, and the other end of the spring is against the bead column of the inner cover where the fork is extended; the fork The rotating hole of the inner cover is provided with a horizontal groove at each end, and a limit opening is provided in the horizontal groove at one end of the fork at the cover opening of the inner cover, and a raised limit rib is provided at the bottom of the bead column of the inner cover; the fork in the outer cover is inserted into the outer peripheral surface of one end of the collar at the bottle opening of the bottle body, and the other end of the collar is fitted and fixed to the outer peripheral surface of the bottle opening of the bottle body. When the collar is removed, the inner cover is screwed into the external thread of the bottle opening of the bottle body, the bead column of the inner cover moves to the limit opening of the fork, and the limit rib on the bead column of the inner cover is inserted and fixed to the limit opening of the fork, and the inner cover moves to the inner diameter of the cover opening of the inner cover. The above-mentioned spring can also be replaced with a corrugated plastic spring sleeve, so that the overall structure can be designed as a fully plastic structure, and the limit opening of the fork is an opening or a groove.

[0009] A raised buckle rib is provided on the outer peripheral surface of the fork at the cover opening of the inner cover, and a buckle groove is provided on the inner diameter of the cover opening of the outer cover corresponding to the buckle rib. The fork and the outer cover are connected as a whole through the buckle rib of the fork and the buckle groove of the outer cover.

[0010] A convex point is provided on the top of the horizontal groove at the rotating hole above the limiting opening of the fork, the bead column of the inner cover exceeds the convex point against the fork, and the limiting rib at the bead column of the inner cover is inserted and fixed to the limiting opening of the fork.

[0011] The outer cover has barbs spaced evenly across its outer periphery above the top opening. When the inner cover's bead column moves to the fork's stopper, the barbs of the top cover engage with the fork's stopper to limit the position below the outer cover's top opening. The stopper mechanism for the top cover is not limited to barbs; ribs or convex grooves may also be used.

[0012] The outer cover is a high-rigidity polymer outer cover, and the high-rigidity polymer material raw material components of the high-rigidity polymer outer cover are prepared according to the following mass ratio: 550-630 parts of ultra-high melt index polypropylene, 210-240 parts of modified ethylene and octene copolymer, 10-15 parts of nucleating agent, 26-38 parts of antioxidant, 26-30 parts of scratch-resistant agent, 20-28 parts of catalyst assistant, 8-11 parts of compatibilizer, and 5-9 parts of lubricant; the above-mentioned high-rigidity polymer material raw material is added from the main feeding port of the twin-screw extruder, the feeding speed of the main feeding is 20±5Hz, the temperature of the melt extrusion is 170-240℃, and the main engine speed of the twin-screw extruder is 300-500 rpm; the specific distribution of the melt extrusion temperature is: 180±10℃ in zone one, 200± 10℃, zone three 220±10℃, zones four to nine 230±10℃; the ultra-high melt index polypropylene is a homopolymer ultra-high melt index polypropylene, and the melt flow rate under the test conditions of 230℃ and 2.16kg is 1500-2500g / 10min; the antioxidants are antioxidant 1076 and antioxidant 1010, and the mass ratio of antioxidant 1076 to antioxidant 1010 is 1:1; the scratch-resistant agent is a mixture of silicone masterbatch, scratch-resistant agent JS-0221A, and scratch-resistant agent JS-0221B in a mass ratio of 1-2:2-3:2-3; the catalytic aid is one or a mixture of any ratio of triisobutylaluminum, diethylzinc, and trimethylaluminum; the compatibilizer is one of the KT series compatibilizers; the lubricant is ethylene bisstearamide.

[0013] The modified ethylene and octene copolymer comprises the following steps: injecting an organic solvent, a catalyst promoter, 1-octene and mono-angle vinyl POSS into a reactor, stirring and heating to a reaction temperature of 95-115° C., a reaction pressure of 1.2-1.8 MPa, a stirring speed of 80-90 rpm, and a stirring time of 10-15 minutes, then injecting an organic solvent solution containing a catalyst, then pressurizing the mixture with ethylene to the reaction pressure, keeping the temperature and pressure for 2-3 hours, stopping the reaction, and post-processing to obtain the modified ethylene and octene copolymer; the mass ratio of the 1-octene to the mono-angle vinyl POSS is 100:15-30; the organic solvent is one of toluene and xylene; and the catalyst promoter is one of triisobutylaluminum, diethylzinc, and trimethylaluminum, or a mixture of several of them in any ratio.

[0014] The invention has a reasonable structural design, is easy to use, facilitates opening of the sealing cover of the cosmetic bottle body, and has a feasible preparation method; it is suitable for use as a high-rigidity polymer water bottle cap based on a strong buckle type of inner and outer covers, and is a structural improvement of similar products. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic cross-sectional structural diagram of the present invention.

[0016] Figure 2 yes Figure 1 Schematic diagram of the three-dimensional structure.

[0017] Figure 3 yes Figure 1 Usage status structure diagram Figure 1 , the bottle body in the picture is a vacuum bottle assembly.

[0018] Figure 4 yes Figure 1 Usage status structure diagram Figure 2 , the bottle in the picture is a cream bottle assembly.

[0019] Figure 5 yes Figure 1 Schematic diagram of the improved partial cross-sectional structure.

[0020] Figure 6 yes Figure 5 Schematic diagram of the internal structure.

[0021] Serial numbers and names of the accompanying drawings: 1. Outer cover, 2. Inner cover, 201. Thorn part, 202. Side groove, 203. Side mouth, 204. Bead column, 3. Gasket, 4. Sealing cover, 5. Vacuum bottle body assembly, 6. Cream bottle body assembly, 7. Fork, 701. Limiting mouth, 702. Snap rib, 8. Spring, 9. Top cover, 10. Ring. Implementation Method

[0022] Now, the structure and use of the present invention will be further described in conjunction with the accompanying drawings. Figures 1-4 As shown, the bottle cap includes an outer cap 1, an inner cap 2, and a gasket 3. The inner cap is fastened to the outer cap, and an inner thread is provided inside the cover opening of the outer cap. The center of the inner top of the inner cap is provided with a thorn portion 201 extending out of the gasket inside the outer cap. The outer edge of the cover opening of the inner cap is provided with an upwardly protruding outer ring, and one side of the outer ring is provided with a side groove 202. The inner diameter of the cover opening of the outer cap corresponding to the side groove is provided with a protruding stopper, and one side of the protruding top ring of the inner cap is provided with a side opening 203. The side groove of the outer ring of the inner cap fits over the stopper of the outer cap. The outer ring of the inner cap is fixed to the inner diameter of the cover opening of the outer cap by dispensing glue, ultrasonic welding, or toothed rib rings and connected as a whole. The top ring of the inner cap is against the inner top of the outer cap. The outer cap is in the shape of an inverted pyramid, and the top of the outer cap is arched. The internal threads of the inner cap are connected to the external threads of the bottle mouth of the vacuum bottle assembly 5 or the external threads of the bottle mouth of the cream bottle assembly 6. The bottle mouths of the vacuum bottle assembly and the cream bottle assembly are respectively provided with sealing caps 4. The inner diameters of the bottle mouths of the vacuum bottle assembly and the cream bottle assembly are respectively provided with inner plugs. The thorn portion of the inner cap pierces the sealing cap and is sealedly inserted into the sealing hole of the inner plug.

[0023] According to the above structural characteristics, further, Figure 5-Figure 6 As shown, a fork is sleeved inside the outer cover, and the fork and the outer cover are connected as one body. Spiral rotation holes are symmetrically provided on both sides of the barrel of the fork. Protruding bead columns 204 are symmetrically provided on the outer circumference of the outer ring of the inner cover. The bead columns of the inner cover are respectively inserted into the rotation holes on both sides of the fork; a top cover 9 is sleeved on the inner diameter of the outer ring of the top of the inner cover. The top cover and the inner cover are connected as one body, and the top cover extends out of the outer cover. A spring 8 is provided on the top cover and the outer circumference of the fork inside the outer cover. One end of the spring is against the top inside the outer cover, and the other end of the spring is against the bead column on the inner cover where the fork is extended. Horizontal grooves are respectively provided at both ends of the rotating hole of the fork, and a limiting opening 701 is provided in the horizontal groove at one end of the fork at the cover opening of the inner cover, and a raised limiting rib is provided at the bottom of the bead column of the inner cover; the fork in the outer cover is inserted into the outer circumference of one end of the ring 10 at the bottle opening at the bottle body, and the other end of the ring is fitted and fixed on the outer circumference of the bottle opening at the bottle body. When the ring is removed, the inner cover is screwed into the external thread of the bottle opening at the bottle body, the bead column of the inner cover moves to the limiting opening of the fork, the limiting rib at the bead column of the inner cover is inserted and fixed to the limiting opening of the fork, and the inner cover moves to the inner diameter of the cover opening of the inner cover.

[0024] The inner lid has a raised snap rib 702 on the outer circumference of the fork at the lid opening. A snap groove is provided on the inner diameter of the outer lid lid opening, corresponding to the snap rib. The fork and outer lid are connected integrally via the fork's snap rib and the outer lid's snap groove. A raised point is provided at the top of the horizontal groove at the rotating hole above the fork's stop opening. The inner lid's bead column interferes with the raised point and abuts against the fork. The inner lid's bead column's retaining rib is inserted and fixed to the fork's stop opening. Equally spaced barbs are provided on the outer circumference of the top lid above the top opening of the outer lid. When the inner lid's bead column moves to the fork's stop opening, the barbs on the top lid interfere with the stop opening and are positioned below the outer lid's top opening.

[0025] During use, the bottle cap is removed and screwed into the vacuum bottle assembly or cream bottle assembly with a sealing cap. The spikes on the inner cap pierce the sealing cap. After removing the bottle cap, the sealing cap can be torn off and then screwed back into the bottle cap. Alternatively, the collar at the bottle mouth is removed, and the extended top cap is pressed and rotated. The inner cap can be screwed into the bottle mouth until the spikes on the inner cap pierce the sealing cap. The inner cap opening is then displaced and fixed to the inner diameter of the outer cap opening.

[0026] The above-mentioned outer cover is a high-rigidity polymer outer cover, and the high-rigidity polymer material raw material components of the high-rigidity polymer outer cover are prepared according to the following mass ratios: Example 1, 550 parts of ultra-high melt index polypropylene, 210 parts of modified ethylene and octene copolymer, 10 parts of nucleating agent, 26 parts of antioxidant, 26 parts of scratch-resistant agent, 20 parts of catalyst aid, 8 parts of compatibilizer, and 5 parts of lubricant; Example 2, 600 parts of ultra-high melt index polypropylene, 220 parts of modified ethylene and octene copolymer, 12 parts of nucleating agent, 32 parts of antioxidant, 28 parts of scratch-resistant agent, 26 parts of catalyst aid, 10 parts of compatibilizer, and 8 parts of lubricant; Example 3, 630 parts of ultra-high melt index polypropylene, 240 parts of modified ethylene and octene copolymer, 15 parts of nucleating agent, 38 parts of antioxidant, 30 parts of scratch-resistant agent, 28 parts of catalyst aid, 11 parts of compatibilizer, and 9 parts of lubricant.

[0027] The mixture of Example 1, Example 2 or Example 3 is added from the main feed port of the twin-screw extruder, the feeding rate of the main feed is 20±5Hz, the temperature of the melt extrusion is 170-240°C, and the main speed of the twin-screw extruder is 300-500 rpm; the specific distribution of the melt extrusion temperature is: 180±10°C in zone 1, 200±10°C in zone 2, 220±10°C in zone 3, and 230±10°C in zones 4-9; the ultra-high melt index polypropylene is a homopolymer ultra-high melt index polypropylene, and the melt under the test conditions of 230°C and 2.16kg is The flow rate is 1500-2500 g / 10 min; the antioxidants are antioxidant 1076 and antioxidant 1010, and the mass ratio of antioxidant 1076 to antioxidant 1010 is 1:1; the scratch-resistant agent is a mixture of silicone masterbatch, scratch-resistant agent JS-0221A, and scratch-resistant agent JS-0221B in a mass ratio of 1-2:2-3:2-3; the catalyst co-agent is one or a mixture of any ratio of triisobutylaluminum, diethylzinc, and trimethylaluminum; the compatibilizer is one of the KT series compatibilizers; and the lubricant is ethylene bisstearamide.

[0028] The modified ethylene and octene copolymer is prepared by the following steps: injecting an organic solvent, a catalyst promoter, 1-octene and uniangular vinyl POSS into a reactor, stirring and heating to a reaction temperature of 95-115° C., a reaction pressure of 1.2-1.8 MPa, a stirring speed of 80-90 rpm, and a time of 10-15 minutes, then injecting an organic solvent solution containing a catalyst, and then pressurizing the mixture with ethylene to the reaction pressure, keeping the temperature and pressure for 2-3 hours, stopping the reaction, and post-processing to obtain a modified ethylene and octene copolymer; the mass ratio of the 1-octene to the uniangular vinyl POSS is 100:15-30; the organic solvent is one of toluene and xylene; and the catalyst promoter is one of triisobutylaluminum, diethylzinc, and trimethylaluminum, or a mixture of any ratio of several thereof.

Claims

1. A high-rigidity polymer water bottle cap based on a strong buckle type with inner and outer covers, the bottle cap comprises an outer cover (1), an inner cover (2) and a gasket (3), the inner cover is buckled and fixed in the outer cover, an inner thread is provided in the cover opening of the outer cover, and a thorn portion (201) is provided at the center of the inner top of the inner cover, which extends out of the gasket on the inner top of the outer cover; it is characterized in that The outer edge of the lid opening of the inner lid (2) is provided with an outer ring that bulges upwards, and one side opening of the outer ring is provided with a side groove (202), and the inner diameter of the lid opening of the outer lid (1) corresponding to the side groove is provided with a bulged limit block, and one side opening of the bulged top ring of the inner lid is provided with a side opening (203); the side groove of the outer ring of the inner lid is fitted on the limit block of the outer lid, and the outer ring of the inner lid is fixed to the inner diameter of the lid opening of the outer lid by dispensing glue, ultrasonic welding or toothed rib ring and connected as a whole, and the top ring of the inner lid is against the inner top of the outer lid; the shape of the outer lid (1) is an inverted pyramid, and the top of the outer lid is arched; a fork (7) is sleeved inside the outer lid (1), and the fork is connected to the outer lid as a whole, and spiral rotating holes are symmetrically provided on both sides of the barrel of the fork, and the outer ring of the inner lid (2) is symmetrically provided with raised bead columns (204) on the outer circumference, and the inner The bead columns of the cover are respectively inserted into the rotation holes on both sides of the fork; the inner diameter of the outer ring of the top of the inner cover is sleeved with a top cover (9), the top cover and the inner cover are connected as a whole, the top cover extends out of the outer cover, and the top cover inside the outer cover and the outer peripheral surface of the fork are provided with a spring (8), one end of the spring is against the top inside the outer cover, and the other end of the spring is against the bead column at the inner cover where the fork is extended; horizontal grooves are respectively provided at both ends of the rotation hole of the fork, and a limiting opening (701) is provided in the horizontal groove at one end of the fork at the cover opening of the inner cover, and a raised limiting rib is provided at the bottom of the bead column of the inner cover; the fork in the outer cover is inserted into the outer peripheral surface of one end of the ring (10) at the bottle opening of the bottle body, and the other end of the ring is fitted and fixed to the outer peripheral surface of the bottle opening at the bottle body. When the ring is removed, the inner cover is screwed into the outer thread of the bottle opening at the bottle body, and the bead column of the inner cover moves to the limiting opening of the fork, and the limiting rib at the bead column of the inner cover is inserted and fixed to the limiting opening of the fork.

2. The high-rigidity polymer water bottle cap based on the strong buckle type of inner and outer covers according to claim 1 is characterized in that The inner thread of the cover opening of the inner cover (2) is connected to the outer thread of the bottle opening of the vacuum bottle assembly (5), or the outer thread of the bottle opening of the cream bottle assembly (6), and the bottle openings of the vacuum bottle assembly and the cream bottle assembly are respectively provided with sealing covers (4).

3. The high-rigidity polymer water bottle cap based on the strong buckle type of inner and outer covers according to claim 2 is characterized in that The vacuum bottle assembly (5) and the cream bottle assembly (6) are provided with inner plugs at the inner diameter of the bottle mouth, respectively. The thorn portion (201) of the inner cover pierces the sealing cover (4), and the thorn portion of the inner cover is sealed and inserted into the sealing hole of the inner plug.

4. The high-rigidity polymer water bottle cap based on the strong buckle type of inner and outer covers according to claim 1 is characterized in that The outer peripheral surface of the fork (7) at the cover opening of the inner cover (2) is provided with a raised buckle rib (702), and the inner diameter of the cover opening of the outer cover corresponding to the buckle rib is provided with a buckle groove, and the fork and the outer cover are connected as a whole through the buckle rib of the fork and the buckle groove of the outer cover.

5. The high-rigidity polymer water bottle cap based on the strong buckle type of inner and outer covers according to claim 1 is characterized in that A convex point is provided on the top of the horizontal groove at the rotating hole above the limiting opening (701) of the fork (7), and the bead column (204) of the inner cover (2) exceeds the convex point against the fork, and the limiting rib at the bead column of the inner cover is inserted and fixed to the limiting opening of the fork.

6. The high-rigidity polymer water bottle cap based on the strong buckle type of inner and outer covers according to claim 1 is characterized in that The outer peripheral surface of the top cover (9) above the top opening of the outer cover (1) is provided with equally spaced barbs, and when the bead column (204) of the inner cover (2) moves to the limiting opening (701) of the fork (7), the barbs of the top cover are locked together to be located below the top opening of the outer cover.

7. The method for preparing a high-rigidity polymer water bottle cap based on strong buckle-type inner and outer covers according to claim 1, characterized in that The outer cover is a high-rigidity polymer outer cover, and the high-rigidity polymer material raw material components of the high-rigidity polymer outer cover are prepared according to the following mass ratio: 550-630 parts of ultra-high melt index polypropylene, 210-240 parts of modified ethylene and octene copolymer, 10-15 parts of nucleating agent, 26-38 parts of antioxidant, 26-30 parts of scratch-resistant agent, 20-28 parts of catalyst assistant, 8-11 parts of compatibilizer, and 5-9 parts of lubricant; the above-mentioned high-rigidity polymer material raw materials are added from the main feeding port of the twin-screw extruder, the temperature of melt extrusion is 170-240°C, and the main engine speed of the twin-screw extruder is 300-500 rpm; the specific distribution of the melt extrusion temperature is: 180±10°C in zone one, 200±10°C in zone two, and 220 in zone three. ±10℃, zone 4-9 230±10℃; the ultra-high melt index polypropylene is a homopolymer ultra-high melt index polypropylene, and the melt flow rate is 1500-2500g / 10min under the test conditions of 230℃ and 2.16kg; the antioxidants are antioxidant 1076 and antioxidant 1010, and the mass ratio of antioxidant 1076 to antioxidant 1010 is 1:1; the scratch-resistant agent is a mixture of silicone masterbatch, scratch-resistant agent JS-0221A, and scratch-resistant agent JS-0221B in a mass ratio of 1-2:2-3:2-3; the catalytic aid is one or a mixture of any ratio of triisobutylaluminum, diethylzinc, and trimethylaluminum; the compatibilizer is one of the KT series compatibilizers; the lubricant is ethylene bisstearamide.

8. The method for preparing a high-rigidity polymer water bottle cap based on strong buckle-type inner and outer covers according to claim 7, characterized in that The modified ethylene and octene copolymer comprises the following steps: injecting an organic solvent, a catalyst promoter, 1-octene and mono-angled vinyl POSS into a reactor, stirring and heating to a reaction temperature of 95-115° C., a reaction pressure of 1.2-1.8 MPa, a stirring speed of 80-90 rpm, and a stirring time of 10-15 minutes, then injecting an organic solvent solution containing a catalyst, then pressurizing the mixture with ethylene to the reaction pressure, keeping the temperature and pressure for a reaction of 2-3 hours, stopping the reaction, and post-processing to obtain the modified ethylene and octene copolymer; the mass ratio of the 1-octene to the mono-angled vinyl POSS is 100:15-30; the organic solvent is one of toluene and xylene; and the catalyst promoter is one of triisobutylaluminum, diethylzinc, and trimethylaluminum, or a mixture of any ratio of several thereof.

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