Soft rubber tube based on composite structure reinforcement

Abstract

The utility model relates to a kind of soft rubber tube based on composite structure reinforcement, including rigid base material piece and soft coating, and the outer periphery of rigid base material piece is equipped with first interlayer groove, first interlayer groove has the outer surface and inner surface oppositely arranged along the direction of thickness, and through hole is set on first interlayer groove, and the through hole is through outer surface and inner surface;Soft coating injection molding is formed on the outer periphery of rigid base material piece, and fills first interlayer groove and forms anchoring structure, when injection molding, melt flows to the side of rigid base material piece away from soft coating by through hole, and after cooling, it forms the encapsulating layer integrated with rigid base material piece.The utility model constructs basic physical binding force by concave-convex fitting, and soft coating forms the effect of " front and rear wrapping + mechanical lock catch " to rigid base material piece, avoids the peeling risk of single surface combination, significantly improves the binding firmness, and there is no cracking, loosening at the joint, solves the temperature sensitivity problem of traditional process.

Description

Technical Field

[0001] This utility model relates to the field of plastic composite pipe technology, and in particular to a soft rubber pipe based on composite structure reinforcement. Background Technology

[0002] In the field of plastic composite products, the composite structure of thermoplastic elastomer (TPE) and polyethylene (PE) is widely used in daily necessities, medical devices, and household goods because it combines the soft touch and elasticity of TPE with the rigid support properties of PE. The core technical challenge of this type of composite structure lies in how to achieve a long-term and strong bond between the TPE soft layer and the PE rigid substrate. The bonding performance directly determines the product's service life, safety, and user experience.

[0003] The existing bonding method between TPE and PE is mainly the traditional hot melt bonding, which is based on heating to melt the surfaces of the two materials and then directly bonding them together. However, this technology has fundamental defects: (1) weak bonding force. The bonding force of this process only depends on the intermolecular forces after melting, and this force is easily affected by temperature fluctuations and material compatibility: unstable temperature will lead to insufficient molecular diffusion or material degradation, and the difference in material polarity will weaken molecular compatibility, ultimately resulting in a bonding strength that is generally lower than 5 N / cm, and edge cracking is likely to occur when subjected to force; (2) poor reliability. During long-term use, the bonding joint is easily affected by both external forces (such as pulling and squeezing) and changes in ambient temperature (-10℃~40℃). External forces will cause repeated stress on the bonding interface. It is susceptible to stress impact, while temperature fluctuations cause interfacial tension due to the difference in thermal expansion coefficients between TPE and PE. Under the combined effect of these two factors, the detachment rate at the joint is as high as 30% or more, which significantly shortens the product's service life. Limited adaptability: Due to insufficient bonding strength and weak resistance to environmental corrosion, it cannot meet the application scenarios with high requirements for sealing performance and aging resistance. For example, in scenarios such as liquid container interfaces, it is necessary to maintain a tight seal at the interface for a long time to prevent leakage, and it is also necessary to withstand the aging test caused by long-term immersion in liquid. The bonding structure made by traditional processes is difficult to achieve these core requirements.

[0004] Therefore, there is an urgent need for an innovative structure that can overcome the bottleneck of hot melt process and significantly improve the bonding strength between TPE and PE. Utility Model Content

[0005] Therefore, the technical problem to be solved by this utility model is to overcome the problems existing in the prior art and propose a soft rubber tube based on composite structure reinforcement, which forms a "front and back wrapping + mechanical locking" effect on rigid substrate components, avoids the peeling risk of single surface bonding, significantly improves the bonding firmness, and has no cracking or loosening at the joint, thus solving the temperature sensitivity problem of traditional processes.

[0006] To solve the above-mentioned technical problems, this utility model provides a flexible tubing based on a composite structure reinforcement, comprising:

[0007] A rigid substrate component has a first interlayer groove on its outer periphery. The first interlayer groove has an outer surface and an inner surface that are arranged opposite to each other along the thickness direction. A through hole is formed on the first interlayer groove that penetrates the outer surface and the inner surface.

[0008] A soft coating layer is injection molded on the outer periphery of the rigid substrate and fills the first interlayer groove to form an anchoring structure. During injection molding, the melt flows through the through hole to the side of the rigid substrate away from the soft coating layer. After cooling, it forms an adhesive layer that is integral with the rigid substrate.

[0009] In one technical solution of this utility model, the depth of the first interlayer groove is 2-5mm.

[0010] In one technical solution of this utility model, the first interlayer groove is continuously spirally distributed on the outer peripheral surface of the rigid substrate, and the soft covering layer fills the continuously spirally distributed first interlayer groove to form a spiral anchoring structure.

[0011] In one technical solution of this utility model, the wall of the first interlayer groove is provided with a micro-tooth structure, the tooth height of the micro-tooth structure is 0.2-0.5mm, and the tooth pitch is 0.5-1mm.

[0012] In one technical solution of this utility model, there are multiple through holes, which are evenly distributed along the circumferential direction on the first interlayer groove.

[0013] In one technical solution of this utility model, the inner circumference of the rigid substrate is provided with a second interlayer groove, and the through hole connects the first interlayer groove and the second interlayer groove.

[0014] In one technical solution of this utility model, the second interlayer groove is continuously spirally distributed on the inner circumferential surface of the rigid substrate, and the melt flows through the through hole to the second interlayer groove and forms an integral coating layer therewith.

[0015] In one technical solution of this utility model, a micro exhaust groove is provided at the highest point of the second interlayer groove.

[0016] The above-mentioned technical solution of this utility model has the following advantages compared with the prior art:

[0017] This invention features a concave skeleton formed by a sandwiched groove on the outer periphery of a rigid substrate. During injection molding, the soft coating fills this groove, creating a convex wrapping. This increases the contact area between the two components by more than 30% compared to traditional planar bonding, establishing a fundamental physical bond through this interlocking of concave and convex surfaces. During injection molding, the melt flows through a through-hole to the side of the rigid substrate facing away from the soft coating. After cooling, it forms an integral coating layer with the rigid substrate, creating a "front and rear wrapping + mechanical locking" effect. This avoids the risk of peeling from single-surface bonding, significantly improving the bonding strength. Actual measurements show that the bonding strength of this structure reaches 8-12 N / cm, with a peeling rate reduced to less than 0.5%. There are no cracks or loosening at the joint, solving the temperature sensitivity problem of traditional processes. Attached Figure Description

[0018] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0019] Figure 1 This is a schematic diagram of a soft rubber tube based on a composite structure reinforcement proposed in an embodiment of this utility model.

[0020] Figure 2 yes Figure 1 A magnified view of part A above.

[0021] Figure 3 This is a product image of a rigid substrate component.

[0022] The reference numerals in the accompanying drawings are as follows: 1. Rigid substrate; 11. First interlayer groove; 12. Through hole; 13. Second interlayer groove; 2. Soft covering layer. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0024] Reference Figures 1 to 3 As shown, this utility model embodiment provides a flexible tubing based on a composite structure reinforcement, including a rigid substrate 1 and a flexible covering layer 2. The rigid substrate 1 has a first interlayer groove 11 on its outer periphery. The first interlayer groove 11 has an outer surface and an inner surface that are arranged opposite to each other along the thickness direction. A through hole 12 is opened on the first interlayer groove 11, penetrating the outer surface and the inner surface. The flexible covering layer 2 is injection molded on the outer periphery of the rigid substrate 1 and fills the first interlayer groove 11 to form an anchoring structure. During injection molding, the melt flows through the through hole 12 to the side of the rigid substrate 1 that is away from the flexible covering layer 2. After cooling, it forms an adhesive layer that is integral with the rigid substrate 1.

[0025] This invention features a concave skeleton formed by a sandwiched groove on the outer periphery of the rigid substrate 1. During injection molding, the soft coating layer 2 fills the sandwiched groove, forming a convex wrapping. This increases the contact area between the two by more than 30% compared to traditional planar bonding, and establishes a basic physical bond through the interlocking of concave and convex parts. During injection molding, the melt flows through the through-hole 12 to the side of the rigid substrate 1 facing away from the soft coating layer 2. After cooling, it forms an adhesive layer integrated with the rigid substrate 1, creating a "front and back wrapping + mechanical locking" effect on the rigid substrate 1. This avoids the risk of peeling from single-surface bonding and significantly improves the bonding strength. Actual measurements show that the bonding strength of this structure reaches 8-12 N / cm, the detachment rate is reduced to less than 0.5%, and there is no cracking or loosening at the joint, solving the temperature sensitivity problem of traditional processes.

[0026] Preferably, the rigid substrate 1 can be made of polyethylene (PE), and the soft coating layer 2 can be made of thermoplastic elastomer (TPE). The rigid substrate 1 is injection molded in one step, and has a first interlayer groove 11 distributed in a ring around its outer periphery. The depth of the groove is 2-5 mm with a tolerance of ±0.2 mm, which serves as the basis for the fitting of the rigid substrate 1 and the soft coating layer 2. Through holes 12 are provided on the first interlayer groove 11. The diameter of the through holes 12 is 1-3 mm with a tolerance of ±0.2 mm. Using the molded rigid substrate 1 as an insert, TPE material is injected into the mold through a second injection molding process. The TPE melt fills the first interlayer groove 11 of the rigid substrate 1 and flows through the through holes 12 to the side of the rigid substrate 1 that is away from the soft coating layer 2. After cooling, it forms an adhesive layer that is integral with the rigid substrate 1, and finally forms a composite pipe.

[0027] In a preferred embodiment, the first interlayer groove 11 is continuously spirally distributed on the outer peripheral surface of the rigid substrate 1, and the soft covering layer 2 fills the continuously spirally distributed first interlayer groove 11 to form a spiral anchoring structure. Preferably, the pitch of the first interlayer groove 11 is 2-5 mm, and the groove depth is 1.5-3 mm; when the TPE soft covering layer 2 is injection molded, it fills the continuously spirally distributed first interlayer groove 11 to form a three-dimensional spiral anchoring structure, upgrading the bonding surface from "planar contact" to "three-dimensional spiral winding", significantly improving the torsional and tensile resistance.

[0028] Furthermore, the wall of the first interlayer groove 11 is provided with a micro-tooth structure. The micro-tooth structure is a continuous protrusion on the wall of the first interlayer groove 11. Each tooth is an isosceles triangle or trapezoid (section), with a tooth height of 0.2-0.5mm and a tooth pitch of 0.5-1mm. When the TPE melt fills the wall of the groove, it will completely cover the micro-tooth to form a "tooth-groove complementary interlocking", which upgrades the contact mode from "surface contact" to "point-surface-tooth" three-dimensional contact, significantly improving the circumferential anti-slip resistance. After working together with the macroscopic structure of "double helical interlayer groove + through hole 12 encapsulation", the micro-tooth structure forms a composite reinforcement system of "macroscopic locking + microscopic anchoring". Therefore, the micro-tooth structure strengthens the strength of the composite structure at the interface level without increasing the complexity of the process through "precise size design + microscopic mechanical interlocking + macroscopic structural synergy".

[0029] In a preferred embodiment, the rigid substrate 1 has a second interlayer groove 13 on its inner periphery. Preferably, the second interlayer groove 13 is distributed in a continuous spiral shape on the inner periphery of the rigid substrate 1. The melt flows through the through hole 12 to the second interlayer groove 13 and forms an integral coating layer with it. It forms an "inner and outer double spiral" composite structure with the first interlayer groove 11 on the outer periphery. After the soft coating layer 2 cools, it wraps the rigid substrate 1 like a "double spiral bandage", so that the bonding surface changes from "single-sided force" to "double-sided balanced force", which significantly improves the axial tensile strength.

[0030] In a preferred embodiment, there are multiple through holes 12, which are evenly distributed along the circumferential direction on the first interlayer groove 11. The through holes 12 connect the first interlayer groove 11 and the second interlayer groove 13, which can evenly distribute the TPE melt in the outer first interlayer groove 11 to the inner second interlayer groove 13, avoiding uneven filling in the inner circumference due to single-point feeding. The flow deviation of each through hole 12 is controlled within ±5%, ensuring that the filling density of each section of the inner second interlayer groove 13 is consistent.

[0031] Furthermore, the second interlayer groove 13 has a continuous spiral structure. When the TPE melt flows along the spiral path, air tends to accumulate at the highest point of the spiral angle (i.e., the area where the melt last reaches). Especially when the melt enters the groove of the second interlayer groove 13 through the annular guide platform, the flow direction changes continuously along the spiral line, making it easier to form a "closed air cavity". Therefore, in this embodiment, a micro exhaust groove is provided at the highest point of the second interlayer groove 13, with a width preferably of 0.05-0.1 mm, to prevent insufficient filling or bubble defects caused by trapped air.

[0032] As an extension, an annular guide platform (not shown in the figure) is provided at the junction of the second interlayer groove 13 and the through hole 12. Preferably, the width of the annular guide platform is 0.8-1.2 mm and the height is 0.5-0.8 mm. The annular guide platform is used to guide the melt flowing out from the through hole 12 and disperse it to the surrounding second interlayer groove 13 to avoid local impact or lack of glue.

[0033] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A soft tube based on composite structure reinforcement, characterized by, include: A rigid substrate component has a first interlayer groove on its outer periphery. The first interlayer groove has an outer surface and an inner surface that are arranged opposite to each other along the thickness direction. A through hole is formed on the first interlayer groove that penetrates the outer surface and the inner surface. A soft coating layer is injection molded on the outer periphery of the rigid substrate and fills the first interlayer groove to form an anchoring structure. During injection molding, the melt flows through the through hole to the side of the rigid substrate away from the soft coating layer. After cooling, it forms an adhesive layer that is integral with the rigid substrate.

2. A soft tube based on composite structure reinforcement according to claim 1, characterized in that: The depth of the first interlayer groove is 2-5mm.

3. A soft tube based on composite structure reinforcement according to claim 1 or 2, characterized in that: The first interlayer groove is continuously spirally distributed on the outer peripheral surface of the rigid substrate, and the soft covering layer fills the continuously spirally distributed first interlayer groove to form a spiral anchoring structure.

4. A soft tube based on composite structure reinforcement according to claim 3, characterized in that: The first interlayer groove has a micro-tooth structure on its groove wall, the tooth height of which is 0.2-0.5mm and the tooth pitch is 0.5-1mm.

5. A flexible tubing based on a composite structure reinforcement according to claim 3, characterized in that: There are multiple through holes, which are evenly distributed along the circumference on the first interlayer groove.

6. A flexible tubing based on a composite structure reinforcement according to claim 5, characterized in that: The rigid substrate has a second interlayer groove on its inner periphery, and the through hole connects the first interlayer groove and the second interlayer groove.

7. A soft tube based on composite structure reinforcement according to claim 6, characterized in that: The second interlayer groove is continuously spirally distributed on the inner circumferential surface of the rigid substrate. The melt flows through the through hole to the second interlayer groove and forms an integral coating layer with it.

8. A flexible tubing based on a composite structure reinforcement according to claim 6, characterized in that: A miniature exhaust vent is provided at the highest point of the second interlayer groove.

Images