Single-sided anti-skid plate for portable stretcher and preparation method of single-sided anti-skid plate

Abstract

The invention relates to the technical field of stretcher manufacturing, in particular to a single-face anti-skid plate for a portable stretcher and a preparation method of the single-face anti-skid plate. The main body is made of medium-density metallocene polyethylene or low-density polyethylene, and the thickness of the main body is 1-4 mm; the front surface of the main body is covered with a vulcanized ethylene propylene diene monomer layer, the shore A hardness of the ethylene propylene diene monomer layer is 30-70, and the thickness of the ethylene propylene diene monomer layer is 0.1-1 mm; the ethylene propylene diene monomer layer and the main body are tightly bonded through chemical bonds which are generated by peroxide and mainly comprise carbon-carbon bonds, and the peel strength of the ethylene propylene diene monomer layer and the main body is larger than 10 MPa. According to the single-sided anti-skid plate for the portable stretcher and the preparation method of the single-sided anti-skid plate, the anti-skid layer and the base material are bonded through chemical bonds, and the anti-skid property, the stability and the portability are considered.

Description

Technical Field

[0001] This invention relates to the field of stretcher manufacturing technology, and in particular to a single-sided anti-slip sheet for portable stretchers and its preparation method. Background Technology

[0002] Portable stretchers are core equipment for transporting the injured in medical emergencies, outdoor rescues, and disaster scenes. The performance of the materials used in their construction directly affects the safety and convenience of patient transport. Single-sided anti-slip materials, with their anti-slip structure only on the side in contact with the injured while retaining the lightweight and easy-to-process characteristics of the base material on the other side, balance anti-slip requirements with the stretcher's portability, making them the preferred material type for portable stretchers. These materials must simultaneously meet core requirements such as reliable anti-slip performance, comfortable contact with the injured, and a robust and durable structure to withstand frequent use in complex rescue environments.

[0003] Currently available portable stretcher anti-slip materials have several shortcomings: Some products have poor compatibility between the anti-slip layer and the base material, relying solely on physical bonding for connection. This lack of a robust bonding structure results in insufficient peel strength, making the anti-slip layer prone to detachment after prolonged friction, vibration, or use in complex environments, severely impacting safety. Furthermore, some anti-slip layer materials have inappropriate hardness designs; excessive hardness affects patient comfort, while excessive softness leads to rapid deterioration of the anti-slip effect, making it difficult to balance anti-slip performance and user experience. Additionally, some materials have an improper match between the base material and the anti-slip layer thickness. An excessively thick base material reduces stretcher portability, while an excessively thin anti-slip layer results in short-lasting anti-slip performance, failing to meet the stringent requirements for comprehensive material performance in rescue scenarios. Summary of the Invention

[0004] This invention provides a single-sided anti-slip sheet for portable stretchers and its preparation method. The anti-slip layer and the substrate are bonded together by chemical bonds, which takes into account anti-slip properties, stability and portability.

[0005] The technical solution adopted in this invention is as follows: a single-sided anti-slip sheet for a portable stretcher, the main body of which is made of medium-density metallocene polyethylene or low-density polyethylene, and the thickness of the main body is 1-4 mm; the front side of the main body is covered with a layer of vulcanized EPDM rubber, the Shore A hardness of which is 30-70 and the thickness is 0.1-1 mm; the EPDM rubber layer and the main body are tightly bonded by chemical bonds mainly composed of carbon-carbon bonds generated by peroxide, and the peel strength between the two is greater than 10 MPa.

[0006] As a further improvement of the present invention, the peroxide is an oily liquid peroxide containing an aromatic ring, selected from one or more of bis(2,5-diphenyltriphenyl)-2, cumene hydroperoxide, dicumene hydroperoxide, and bis(tert-butylperoxycumene).

[0007] As a further improvement of the present invention, the Shore A hardness of the EPDM rubber layer is 40-60.

[0008] As a further improvement of the present invention, the thickness of the main body is 2-3 mm, and the thickness of the EPDM rubber layer is 0.3-0.7 mm.

[0009] A method for preparing a single-sided anti-slip sheet for a portable stretcher includes the following steps:

[0010] Step 1: Prepare the main body sheet by extrusion calendering. The main body sheet is made of medium-density metallocene polyethylene or low-density polyethylene, and the thickness n is 1-4 mm.

[0011] Step 2: Mix EPDM rubber with additives to form a compound, and then press it into a rubber sheet with a thickness of 1.1 mm using a calender.

[0012] Step 3: Apply peroxide evenly to the front side of the main body plate, then cover the rubber sheet on the peroxide-coated side and apply pressure to make it initially adhered;

[0013] Step 4: Place the composite material obtained in Step 3 in a calender at a temperature of 100-120℃, control the calendering thickness to be n+m, and calender to form a composite sheet, where m is the target thickness of the EPDM rubber layer and m is 0.1-1mm.

[0014] Step 5: The composite board is placed in a drum vulcanizing machine at a temperature of 140-180℃ for vulcanization. The vulcanization time is the positive vulcanization time of the EPDM compound + 10s, so that the EPDM rubber is vulcanized and forms chemical bonds mainly composed of carbon-carbon bonds between it and the main board.

[0015] As a further improvement of the present invention, the peroxide is an oily liquid peroxide containing an aromatic ring, selected from one or more of bis(2,5-diphenyltriphenyl)-2, cumene hydroperoxide, dicumene hydroperoxide, and bis(tert-butylperoxycumene).

[0016] As a further improvement of the present invention, the Shore A hardness of the EPDM rubber in step two is 30-70, preferably 40-60.

[0017] As a further improvement of the present invention, n in step one is 2-3 mm, and m in step four is 0.3-0.7 mm.

[0018] As a further improvement of the present invention, the temperature of the drum vulcanizing machine in step five is 150-170℃.

[0019] The beneficial effects of this invention are as follows: This invention uses medium-density metallocene polyethylene or low-density polyethylene as the main body, combined with a vulcanized EPDM rubber layer with a Shore A hardness that is suitable. The carbon-carbon bonds formed by peroxides achieve a tight bond between the two, with a peel strength exceeding 10 MPa. This not only prevents the anti-slip layer from falling off, but also balances portability and anti-slip durability through a reasonable thickness combination. At the same time, the rubber layer hardness is suitable to ensure the comfort of the injured person when in contact with it, effectively meeting the usage needs of emergency rescue, outdoor rescue and other scenarios, improving the safety of the injured person's transport and the reliability of the board material. Detailed Implementation

[0020] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0021] This invention provides a single-sided anti-slip sheet for a portable stretcher. The main body is made of medium-density metallocene polyethylene or low-density polyethylene with a thickness of 1-4 mm. The front of the main body is covered with a vulcanized EPDM rubber layer with a Shore A hardness of 30-70 and a thickness of 0.1-1 mm. The EPDM rubber layer and the main body are tightly bonded by chemical bonds mainly composed of carbon-carbon bonds generated by peroxides, and the peel strength between the two is greater than 10 MPa.

[0022] In this invention, the peroxide is an oily liquid peroxide containing an aromatic ring, selected from one or more of bis(2,5-diphenyltriphenyl)-2,5-diisopropylbenzene hydroperoxide, and bis(tert-butylperoxyisopropylbenzene)-2,5-diisopropylbenzene hydroperoxide.

[0023] In this invention, the Shore A hardness of the EPDM rubber layer is 40-60.

[0024] In this invention, the main body thickness is 2-3 mm, and the EPDM rubber layer thickness is 0.3-0.7 mm.

[0025] A method for preparing a single-sided anti-slip sheet for a portable stretcher includes the following steps:

[0026] Step 1: Prepare the main body sheet by extrusion calendering. The main body sheet is made of medium-density metallocene polyethylene or low-density polyethylene, with a thickness n of 1-4 mm.

[0027] Step 2: Mix EPDM rubber with additives to form a compound, and then press it into a rubber sheet with a thickness of 1.1 mm using a calender.

[0028] Step 3: Apply peroxide evenly to the front of the main body panel, then cover the peroxide-coated side with a rubber sheet and apply pressure to allow it to initially adhere.

[0029] Step 4: Place the composite material obtained in Step 3 in a calender at a temperature of 100-120℃, control the calendering thickness to be n+m, and calender to form a composite sheet, where m is the target thickness of the EPDM rubber layer and m is 0.1-1mm.

[0030] Step 5: Put the composite board into a drum vulcanizing machine at a temperature of 140-180℃ for vulcanization. The vulcanization time is the normal vulcanization time of EPDM compound + 10s, so that the EPDM rubber is vulcanized and forms chemical bonds mainly composed of carbon-carbon bonds between it and the main board.

[0031] The peroxide of the present invention is an oily liquid peroxide containing an aromatic ring, selected from one or more of bis(2,5-diphenyltriphenyl)-2, cumene hydroperoxide, dicumene hydroperoxide, and bis(tert-butylperoxycumene).

[0032] In step two of this invention, the Shore A hardness of the EPDM rubber is 30-70, preferably 40-60.

[0033] In step one of this invention, n is 2-3 mm, and in step four, m is 0.3-0.7 mm.

[0034] In step five of this invention, the temperature of the drum vulcanizing machine is 150-170℃.

[0035] Working Principle: In practical implementation, this invention first produces a polyethylene main body sheet of a specified thickness using extrusion calendering. Then, EPDM rubber is mixed with additives and pressed into a rubber sheet of a preset thickness. An oily liquid peroxide containing aromatic rings is coated onto the surface of the main body sheet, allowing the rubber sheet to initially adhere to the surface. After precise control of the composite thickness using a 100-120℃ calender, it is fed into a 140-180℃ drum vulcanizing machine for vulcanization. During vulcanization, the peroxide decomposes, triggering a chemical reaction that forms stable chemical bonds, primarily carbon-carbon bonds, between the rubber layer and the main body, simultaneously achieving the vulcanization and shaping of the EPDM rubber. In use, the polyethylene main body, with its 1-4mm thickness, balances support and portability. The rubber layer, with a Shore A hardness of 30-70, provides reliable anti-slip properties and a comfortable contact experience. The carbon-carbon bond bonding also achieves a peel strength exceeding 10MPa, resisting friction and vibration during handling and ensuring the anti-slip layer does not detach, thus meeting the needs of safe transport of injured personnel in various rescue scenarios.

[0036] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A single-sided anti-slip material for a portable stretcher, characterized in that, The main body is made of medium-density metallocene polyethylene or low-density polyethylene, and the thickness of the main body is 1-4 mm. The front side of the main body is covered with a layer of vulcanized EPDM rubber, which has a Shore A hardness of 30-70 and a thickness of 0.1-1 mm. The EPDM rubber layer and the main body are tightly bonded by chemical bonds mainly composed of carbon-carbon bonds generated by peroxides, and the peel strength between the two is greater than 10 MPa.

2. The single-sided anti-slip sheet for a portable stretcher according to claim 1, characterized in that, The peroxide is an oily liquid peroxide containing an aromatic ring, selected from one or more of bis(2,5-diphenyltriphenyl)-2,5-diisopropylbenzene hydroperoxide, and bis(tert-butylperoxyisopropylbenzene)-2,5-diisopropylbenzene hydroperoxide.

3. The single-sided anti-slip material for a portable stretcher according to claim 1, characterized in that, The Shore A hardness of the EPDM rubber layer is 40-60.

4. The single-sided anti-slip material for a portable stretcher according to claim 1, characterized in that, The thickness of the main body is 2-3 mm, and the thickness of the EPDM rubber layer is 0.3-0.7 mm.

5. A method for preparing a single-sided anti-slip sheet for a portable stretcher, characterized in that, Includes the following steps: Step 1: Prepare the main body sheet by extrusion calendering. The main body sheet is made of medium-density metallocene polyethylene or low-density polyethylene, and the thickness n is 1-4 mm. Step 2: Mix EPDM rubber with additives to form a compound, and then press it into a rubber sheet with a thickness of 1.1 mm using a calender. Step 3: Apply peroxide evenly to the front side of the main body plate, then cover the rubber sheet on the peroxide-coated side and apply pressure to make it initially adhered; Step 4: Place the composite material obtained in Step 3 in a calender at a temperature of 100-120℃, control the calendering thickness to be n+m, and calender to form a composite sheet, where m is the target thickness of the EPDM rubber layer and m is 0.1-1mm. Step 5: The composite board is placed in a drum vulcanizing machine at a temperature of 140-180℃ for vulcanization. The vulcanization time is the normal vulcanization time of the EPDM compound + 10s, so that the EPDM rubber is vulcanized and forms chemical bonds mainly composed of carbon-carbon bonds between it and the main board.

6. The method for preparing a single-sided anti-slip sheet for a portable stretcher according to claim 5, characterized in that, The peroxide is an oily liquid peroxide containing an aromatic ring, selected from one or more of bis(2,5-diphenyltriphenyl)-2,5-diisopropylbenzene hydroperoxide, and bis(tert-butylperoxyisopropylbenzene)-2,5-diisopropylbenzene hydroperoxide.

7. The method for preparing a single-sided anti-slip sheet for a portable stretcher according to claim 5, characterized in that, The Shore A hardness of the EPDM rubber mentioned in step two is 30-70, preferably 40-60.

8. The method for preparing a single-sided anti-slip sheet for a portable stretcher according to claim 5, characterized in that, In step one, n is 2-3 mm, and in step four, m is 0.3-0.7 mm.

9. The method for preparing a single-sided anti-slip sheet for a portable stretcher according to claim 5, characterized in that, The temperature of the drum vulcanizing machine mentioned in step five is 150-170℃.