Trunk cover with bending and whitening resistance and manufacturing process thereof

Abstract

A trunk cover with bending and whitening resistance comprises 58-65 parts of modified PP (polypropylene), 14-18 parts of modified POE (polyolefin elastomer), 10-13 parts of LLDPE (linear low density polyethylene), 4-6 parts of antioxidant and 6-9 parts of colorant, the modified PP comprises co-polypropylene, elastomer, filler, antioxidant, lubricant and color master batch, and the main component of the modified POE is formed by catalytic copolymerization of ethylene and alpha-olefin through a metallocene catalyst. According to the invention, the modified PP is adopted as a main material and has good impact resistance and toughness, and the modified POE and LLDPE can further improve the mechanical strength and toughness, better disperse stress and reduce stress concentration of the material during bending, so that the bending resistance is improved, the trunk lid has good bending whitening resistance, and after long-term use, the trunk lid has good impact resistance and toughness. The appearance effect of the product can still be kept, and the service life of the product is prolonged.

Description

Technical Field

[0001] The present invention relates to a luggage case shell, in particular to a luggage case lid with anti-bending and whitening performance and its manufacturing process. Background Art

[0002] As an essential item for traveling, when consumers choose a luggage case, they not only pay attention to the appearance design but also attach importance to the material identification and process details of the product. The durability of the luggage case directly affects the user experience. Many consumers have found that after using the luggage case for a period of time, the bending parts of the case shell are prone to turn white, which not only affects the aesthetics but also exposes the quality problems of the case body material.

[0003] The fundamental reason for the whitening at the bending part of the case shell is material fatigue. When the case body repeatedly bears the bending stress, the molecular structure of the material will undergo irreversible changes. Although common case shell materials such as polycarbonate (PC) have good toughness, under the long-term bending effect, the molecular chains will break, microcracks will appear on the material surface, forming white marks, which brings troubles to users. Summary of the Invention

[0004] Based on this, it is necessary to provide a luggage case lid with anti-bending and whitening performance and its manufacturing process in view of the deficiencies in the prior art.

[0005] A luggage case lid with anti-bending and whitening performance, characterized in that it includes, according to the component ratio:

[0006]

[0007]

[0008] Among them, the components of the modified PP include block copolymerized polypropylene, elastomer, filler, antioxidant, lubricant, and masterbatch. The main components of the modified POE are copolymerized from ethylene and α-olefin through a metallocene catalyst.

[0009] In one embodiment, the component ratio of the modified PP is:

[0010]

[0011] Among them, the block copolymerized polypropylene (PP-B) is used as the block copolymerized polypropylene.

[0012] In one embodiment, the filler is one or a mixture of talc powder and calcium carbonate.

[0013] In one embodiment, the elastomer is one or a mixture of EPDM ethylene-propylene-diene monomer and EPR ethylene-propylene rubber.

[0014] In one embodiment, the lubricant is calcium stearate or paraffin wax

[0015] In one embodiment, the composition ratio of the modified PP is as follows:

[0016]

[0017]

[0018] Among them, the copolymerized polypropylene is random copolymerized polypropylene (PP-R).

[0019] In one embodiment, the elastomer is EPR ethylene-propylene rubber, and the filler is glass fiber.

[0020] The present invention also provides a manufacturing process for a luggage case lid with anti-bending and whitening performance, which is characterized by including the following steps:

[0021] (1) Mixing materials, uniformly mixing modified PP, modified POE, LLDPE, antioxidant, and colorant;

[0022] (2) Granulation, melting and granulating the mixed materials obtained in step (1). By heating the mixed materials to 180°C, the mixed materials are melted. After stirring evenly, they are cooled and solidified into particles for subsequent use;

[0023] (3) Injection molding, heating the particles obtained in step (2) to 230 - 250°C to make the particles in a molten state, and molding the luggage case shell under a pressure of 800 - 1200T.

[0024] The beneficial effects of the luggage case lid with anti-bending and whitening performance of the present invention are as follows: The modified PP as the main material has good impact resistance and toughness, while the modified POE and LLDPE can further improve the mechanical strength and toughness, better disperse stress, and reduce the stress concentration of the material during bending, thereby improving the anti-bending performance, enabling the luggage case lid to have good anti-bending and whitening performance. After long-term use, the appearance effect of the product can still be maintained, and the service life of the product is improved. Detailed implementation manners

[0025] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following combines the solutions to make a detailed description of the specific implementation manners of the present invention. Many specific details are set forth in the following description to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein. Those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0026] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the embodiment, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0027] In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0028] In the present invention, unless otherwise clearly specified and limited, the terms such as "mounted", "connected", "connected to", "fixed" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In the present invention, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0030] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation.

[0031] Example 1

[0032] This example provides a suitcase lid with anti-bending and whitening properties, which includes by component ratio

[0033]

[0034] Among them, the modified PP as the main material has good impact resistance and toughness, while the modified POE and LLDPE can further improve the mechanical strength and toughness, better disperse stress, reduce the stress concentration of the material during bending, thereby improving the anti-bending performance, enabling the suitcase lid to have good anti-bending and whitening properties. After long-term use, the appearance effect of the product can still be maintained, and the service life of the product can be improved.

[0035] The component ratio of the modified PP is:

[0036]

[0037]

[0038] Among them, the copolymerized polypropylene uses block copolymerized polypropylene (PP-B). Using copolymerized polypropylene has better impact resistance and toughness. The elastomer is used to improve the impact resistance of the material, especially the toughness at low temperatures. The filler is used to improve the rigidity, strength and dimensional stability of the material. The antioxidant prevents the material from aging due to oxidation during processing and use. The lubricant is calcium stearate or paraffin wax to improve the processing fluidity of the material and reduce the friction during the molding process. The additives are ultraviolet stabilizers, antistatic agents, etc.

[0039] The modified POE uses 6202POE, and its main components are copolymerized by ethylene and α-olefin through a metallocene catalyst, and it has better performance in terms of mechanical strength, heat resistance and aging resistance.

[0040] Example 2

[0041] This example provides a suitcase lid with anti-bending and whitening properties, which includes by component ratio:

[0042]

[0043] Among them, the modified PP as the main material has good impact resistance and toughness, while the modified POE and LLDPE can further improve the mechanical strength and toughness, better disperse stress, and reduce the stress concentration of the material during bending, so that the trunk lid has good anti-bending and whitening performance. After long-term use, the appearance effect of the product can still be maintained, and the service life of the product can be improved.

[0044] The component ratio of the modified PP is:

[0045]

[0046] Among them, the copolymerized polypropylene uses block copolymerized polypropylene (PP-B), and the use of copolymerized polypropylene has better impact resistance and toughness. The elastomer is used to improve the impact resistance of the material, especially the toughness at low temperatures. The filler is used to improve the rigidity, strength and dimensional stability of the material. The antioxidant prevents the material from aging due to oxidation during processing and use. The lubricant is calcium stearate or paraffin wax to improve the processing fluidity of the material and reduce the friction during the molding process. The additives are ultraviolet stabilizers, antistatic agents, etc.

[0047] The modified POE uses 6202POE, and its main components are copolymerized by ethylene and α-olefin through a metallocene catalyst, and it has better performance in terms of mechanical strength, heat resistance and aging resistance.

[0048] Example 3

[0049] This example provides a trunk lid with anti-bending and whitening performance, which includes according to the component ratio

[0050]

[0051] Among them, the modified PP as the main material has good impact resistance and toughness, while the modified POE and LLDPE can further improve the mechanical strength and toughness, better disperse stress, and reduce the stress concentration of the material during bending, so that the trunk lid has good anti-bending and whitening performance. After long-term use, the appearance effect of the product can still be maintained, and the service life of the product can be improved.

[0052] The component ratio of the modified PP is:

[0053]

[0054] Among them, the copolymerized polypropylene uses block copolymerized polypropylene (PP-B). Using copolymerized polypropylene has better impact resistance and toughness. The elastomer is used to improve the impact resistance of the material, especially the toughness in a low-temperature environment. The filler is used to improve the rigidity, strength, and dimensional stability of the material. The antioxidant prevents the material from aging due to oxidation during processing and use. The lubricant is calcium stearate or paraffin wax to improve the processing fluidity of the material and reduce the friction during the molding process. The additives are ultraviolet stabilizers, antistatic agents, etc.

[0055] The modified POE uses 6202POE, and its main components are copolymerized from ethylene and α-olefin through a metallocene catalyst, and it has better performance in terms of mechanical strength, heat resistance, and aging resistance.

[0056] Example 4

[0057] This example provides a luggage lid with anti-bending and whitening performance, including by component ratio

[0058]

[0059]

[0060] Among them, the modified PP as the main material has good impact resistance and toughness, while the modified POE and LLDPE can further improve the mechanical strength and toughness, better disperse stress, and reduce the stress concentration of the material during bending, so that the luggage lid has good anti-bending and whitening performance. After long-term use, the appearance effect of the product can still be maintained, and the service life of the product is improved.

[0061] The component ratio of the modified PP is:

[0062]

[0063] Among them, the copolymerized polypropylene uses random copolymerized polypropylene (PP-R). Using copolymerized polypropylene has better rigidity and heat resistance. The elastomer is used to improve the impact resistance of the material, especially the toughness in a low-temperature environment. The filler is used to improve the heat resistance and rigidity of the material. The antioxidant prevents the material from aging due to oxidation during processing and use. The lubricant is calcium stearate or paraffin wax to improve the processing fluidity of the material and reduce the friction during the molding process. The additives are ultraviolet stabilizers, antistatic agents, etc.

[0064] The modified POE uses 6202POE, and its main components are copolymerized from ethylene and α-olefin through a metallocene catalyst, and it has better performance in terms of mechanical strength, heat resistance, and aging resistance.

[0065] Compared with the first three embodiments, the suitcase shells produced in the first three embodiments are more excellent in impact resistance and toughness, while the suitcase shell produced in this embodiment is more excellent in rigidity and heat resistance.

[0066] The present invention also provides a manufacturing process for a suitcase lid with anti-bending and whitening performance, which is used to manufacture suitcase luggage. The suitcase lid with anti-bending and whitening performance includes the following steps:

[0067] (1) Mixing materials, uniformly mixing modified PP (polypropylene), modified POE (polyolefin elastomer), LLDPE, antioxidant, and colorant;

[0068] (2) Granulation, melting and granulating the mixed materials obtained in step (1). By heating the mixed materials to 180 °C, the mixed materials are melted. After stirring evenly, they are cooled and solidified into particles for subsequent use;

[0069] (3) Injection molding, heating the particles obtained in step (2) to 230 - 250 °C to make the particles in a molten state, and molding the suitcase shell under a pressure of 800 - 1200T.

[0070] The technical features of the above-mentioned embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0071] The above-mentioned embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent should be subject to the appended claims.

Claims

1. A luggage box cover with anti-bending and whitening performance, characterized in that: Ingredients include: The components of the modified PP include copolymerized polypropylene, elastomer, filler, antioxidant, lubricant and masterbatch. The main component of the modified POE is copolymerized by ethylene and α-olefin through a metallocene catalyst.

2. The luggage box cover with anti-bending whitening performance according to claim 1, characterized in that: The composition ratio of the modified PP is: Among them, the copolymer polypropylene adopts block copolymer polypropylene.

3. The luggage box cover with anti-bending whitening performance according to claim 2, characterized in that: The filler is one of talcum powder and calcium carbonate or a mixture thereof.

4. The luggage box cover with anti-bending whitening performance according to claim 2, characterized in that: The elastomer is one of EPDM ethylene-propylene-diene monomer and EPR ethylene-propylene rubber or a mixture thereof.

5. The luggage box cover with anti-bending whitening performance according to claim 2, characterized in that: The lubricant is calcium stearate or paraffin.

6. The luggage box cover with anti-bending whitening performance according to claim 1, characterized in that: The composition ratio of the modified PP is: Among them, the copolymer polypropylene adopts random copolymer polypropylene (PP-R).

7. The luggage box cover with anti-bending whitening performance according to claim 6, characterized in that: The elastomer is EPR ethylene-propylene rubber, and the filler is glass fiber.

8. A process for manufacturing a luggage case cover with anti-bending and whitening properties, used for manufacturing the luggage case cover with anti-bending and whitening properties as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: (1) Mixing: uniformly mixing the modified PP, modified POE, LLDPE, antioxidant and colorant; (2) Granulation: melt granulation of the mixture obtained in step (1), by heating the mixture to 180° C. to melt the mixture, stirring it evenly, and then cooling and solidifying it into granules for subsequent use; (3) Injection molding: the granules obtained in step (2) are heated to 230-250° C. to make the granules in a molten state, and are molded into a luggage case shell at a pressure of 800-1200T.

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