CN-122008733-A - Polyurethane buffer layer structure, preparation process and tire comprising same

CN122008733ACN 122008733 ACN122008733 ACN 122008733ACN-122008733-A

Abstract

The invention provides a polyurethane buffer layer structure, a preparation process and a inflation-free tire comprising the same, belongs to the technical field of tires, and can solve the technical problems that the buffer layer is only born in a grounding area, the damping buffer effect is limited, and the performance of materials is rapidly reduced due to a large amount of heat generation during high-speed running, and the service performance and the service life of the tire are influenced in the polyurethane inflation-free tire. The polyurethane buffer layer structure comprises a first rigid member, a second rigid member and a polyurethane buffer layer, wherein the polyurethane buffer layer is vulcanized and adhered between the first rigid member and the second rigid member, and at least one layer of buffer hole is formed in the polyurethane buffer layer. The invention can be applied to the inflation-free tire, and the cushioning and shock absorption performance, the load resistance performance and the high-speed performance of the inflation-free tire are improved.

Inventors

ZHANG YONG
WANG JUN
DING JIANG
Qu Binjian
WANG MINGJIE
HUANG NA
SONG KEJIAN

Assignees

青岛双星轮胎工业有限公司

Dates

Publication Date: 20260512
Application Date: 20260402

Claims (10)

1. The polyurethane buffer layer structure is characterized by comprising a first rigid member, a second rigid member and a polyurethane buffer layer, wherein the polyurethane buffer layer is bonded between the first rigid member and the second rigid member through vulcanization, and at least one layer of buffer holes are formed in the polyurethane buffer layer.
2. The process for preparing a polyurethane cushioning layer structure according to claim 1, comprising the steps of: the positioning and clamping step is to clamp and fix the first rigid member and the second rigid member on the first molding pressing plate through a positioning assembly; a pre-gap setting step of setting a positioning auxiliary member between the first molding press plate and the positioning assembly to form a pre-gap; A casting step of casting polyurethane into a gap formed between the first rigid member and the second rigid member; Assembling a second molding press plate, and arranging a positioning auxiliary component between the second molding press plate and the positioning component to form a pre-gap; a pressurizing step of installing a pressurizing assembly to enable the pressurizing assembly to be connected with the first molding pressing plate and the second molding pressing plate; And a vulcanization molding step, namely releasing the pre-gap, and integrally vulcanization molding the tooling to obtain the polyurethane buffer layer structure.
3. The process for preparing the polyurethane buffer layer structure according to claim 2, wherein the step of positioning and clamping is preceded by a pretreatment step of cleaning the bonding surfaces of the first rigid member and the second rigid member and brushing adhesive glue.
4. The process for preparing a polyurethane cushioning layer structure according to claim 2, wherein in said casting step, the level of polyurethane is at least flush with the upper edge of said first rigid member adjacent said second molded platen.
5. The process for preparing a polyurethane cushion structure according to claim 2, wherein the pre-gap is released by removing the positioning auxiliary member in the vulcanization molding step, and the vulcanization temperature is 115-125 ℃ and the vulcanization time is 24h.
6. The process for preparing a polyurethane buffer layer structure according to claim 2, wherein the process is realized by using a polyurethane buffer layer tooling, wherein the polyurethane buffer layer tooling comprises a plurality of tooling units with the same structure, and each tooling unit comprises The molding assembly is used for molding the side surface of the polyurethane buffer layer and molding the buffer hole; the positioning assembly is connected with the forming assembly and used for clamping and fixing the positions of the first rigid member and the second rigid member; The positioning auxiliary component is arranged between the forming pressing plate and the positioning assembly and is used for forming a pre-gap between the forming pressing plate and the positioning assembly; and the two groups of pressurizing assemblies are connected with the two groups of forming assemblies in the same tooling unit, and are used for closing the die and providing continuous pressure for the polyurethane material.
7. The process for preparing a polyurethane cushioning layer structure according to claim 6, wherein each set of said molded components comprises Forming a pressing plate; The buffer hole bolts penetrate through the middle parts of the corresponding molding pressing plates and extend, and the extending directions of the buffer hole bolts of the two molding assemblies of each tool unit are opposite.
8. The process for preparing a polyurethane cushion structure according to claim 7, wherein each set of the pressurizing members comprises The two ends of each connecting rod respectively penetrate through preset through holes on two forming pressing plates oppositely arranged in the same tool unit and extend outwards; the four pressure springs are respectively sleeved at the outwards extending end parts of the connecting rods correspondingly, and the pressure springs are positioned at the outer sides of the forming pressing plates.
9. A tire comprising the polyurethane cushion structure of claim 1.
10. The tire of claim 9, further comprising a tread and a tread breaker layer disposed in sequence from the exterior to the interior, the tread breaker layer disposed outboard of the first rigid member, the tread breaker layer being at least one layer.

Description

Polyurethane buffer layer structure, preparation process and tire comprising same Technical Field The invention belongs to the technical field of tires, and particularly relates to a polyurethane buffer layer structure, a preparation process and a inflation-free tire comprising the same. Background The inflation-free tire is a tire that achieves a shock absorbing and cushioning performance without the aid of air pressure. Compared with the pneumatic tire, the inflation-free tire can complete the supporting and buffering functions of the tire only by means of the material and the structural characteristics of the inflation-free tire. Currently, the inflation-free tire on the market mainly comprises a rubber solid tire and a polyurethane open structure tire, wherein the polyurethane inflation-free tire generally has a polyurethane buffer layer directly arranged below a tread, and when the tire bears load, only the buffer layer near a grounding area participates in bearing, so that the damping buffer function can only be limited to a local buffer layer structure above the grounding area, and therefore, the buffer layer needs to comprehensively consider key indexes such as bearing capacity, traction performance, braking performance and the like during design. In addition, when the vehicle runs at a high speed of 100km/h or more, the polyurethane buffer layer is liable to generate a large amount of heat, resulting in rapid degradation of material properties, thereby affecting the service performance and life of the tire. Therefore, it is desirable to provide a novel polyurethane cushion layer structure for a inflation-free tire to improve the cushioning and damping properties, the load-bearing properties and the high-speed properties of the conventional inflation-free tire. Disclosure of Invention Aiming at the technical problems that the buffer layer is only borne in the grounding area, the shock absorption and buffer effect is limited, and the material performance is rapidly reduced due to a large amount of heat generation during high-speed running, and the service performance and service life of the tire are influenced, the invention provides a polyurethane buffer layer structure, a preparation process and the inflation-free tire comprising the structure, and the invention has the advantages of improving the shock absorption performance, the load resistance performance and the high-speed performance of the inflation-free tire. In order to achieve the purpose, the technical scheme adopted by the invention is that the polyurethane buffer layer structure comprises a first rigid member, a second rigid member and a polyurethane buffer layer, wherein the polyurethane buffer layer is vulcanized and adhered between the first rigid member and the second rigid member, and at least one layer of buffer holes are formed in the polyurethane buffer layer. Compared with the existing polyurethane inflation-free tire, the polyurethane buffer layer is directly arranged below the tire tread, the polyurethane buffer layer is vulcanized and adhered between two layers of rigid structures, after the polyurethane buffer layer is subjected to load, the whole polyurethane buffer layer is subjected to the actions of pressure, tension and torsion, the structural stress is more uniform and reasonable, the buffering damping performance and the load-resisting performance of the tire are improved, heat can be uniformly dispersed and rapidly emitted through the rigid structures during high-speed running, and the high-speed performance of the inflation-free tire is improved. The design of the buffer holes can optimize the stress distribution of the polyurethane buffer layer, improve the deformability and elastic recovery performance of the polyurethane buffer layer, and further enhance the buffer and shock absorption performance of the tire. The polyurethane buffer layer structure can expand the design range of the buffer holes and realize excellent buffer damping performance, high-speed performance and load resistance. The invention further provides a preparation process of the polyurethane buffer layer structure, which comprises the steps of fixing a first rigid member and a second rigid member on a first molding pressing plate through a positioning assembly in a clamping mode, setting a pre-gap, setting a positioning auxiliary part between the first molding pressing plate and the positioning assembly to form a pre-gap, casting polyurethane into a gap formed between the first rigid member and the second rigid member, assembling the second molding pressing plate, setting the positioning auxiliary part between the second molding pressing plate and the positioning assembly to form the pre-gap, installing a pressurizing assembly to enable the pressurizing assembly to be connected with the first molding pressing plate and the second molding pressing plate, and vulcanizing and molding the tool integrally through vulcanization and molding to obtain