阅读说明：本技术 一种橡胶密封圈及其制备方法 (Rubber sealing ring and preparation method thereof ) 是由 陶伟 陆晖绣 汪子昂 于 2020-06-14 设计创作，主要内容包括：本发明公开了一种橡胶密封圈及其制备方法,包括内侧环体、外侧环体、粘接层；本发明改变了传统的橡胶密封圈的结构和工艺,将橡胶密封圈进行纵向剖开之后形成内侧环体和外侧环体,本发明在内侧环体的外侧中间四周开设了环形伸缩槽,如此使得内侧环体的伸缩性更好,当轴插入内侧环体之后挤压内侧环体,使得内侧环体于轴的四周外侧贴合,密封效果更加持久。(The invention discloses a rubber sealing ring and a preparation method thereof, wherein the rubber sealing ring comprises an inner side ring body, an outer side ring body and an adhesive layer; the structure and the process of the traditional rubber sealing ring are changed, the rubber sealing ring is longitudinally split to form the inner side ring body and the outer side ring body, the annular telescopic grooves are formed in the middle of the outer side of the inner side ring body, so that the flexibility of the inner side ring body is better, the inner side ring body is extruded after the shaft is inserted into the inner side ring body, the inner side ring body is attached to the outer side of the periphery of the shaft, and the sealing effect is more durable.)

1. A rubber sealing ring is characterized by comprising an inner ring body, an outer ring body and an adhesive layer; an annular telescopic groove is formed in the outer side of the middle of the inner side ring body; the outer ring body is arranged on the outer side of the periphery of the inner ring body; a plurality of annular bonding grooves are respectively formed in the upper and lower ring surfaces of the inner side of the outer ring body and the outer side of the inner ring body; the annular bonding grooves on the inner side of the outer ring body and the outer side of the inner ring body are respectively butted; the annular bonding groove is filled with a bonding layer; the inner ring body and the outer ring body comprise the following components in parts by weight: 50-60 parts of nitrile rubber, 20-25 parts of acrylate rubber, 5-10 parts of alkyd resin, 2-5 parts of carbon black, 1-2 parts of anti-aging agent and 1-2 parts of sulfur; the adhesive layer comprises the following components in parts by weight: 50-60 parts of polyurethane, 10-20 parts of epoxy resin and 50-100 parts of flax short fiber.

2. The rubber seal ring of claim 1, wherein the inner ring and the outer ring each have a semi-circular configuration in cross-section.

3. The rubber seal ring of claim 1, wherein the cross section of the middle outer annular expansion groove of the inner ring body is a V-shaped structure with a larger outer part and a smaller inner part.

4. The rubber seal ring of claim 1, wherein said annular bonding grooves each have a V-shaped configuration with a larger outer portion and a smaller inner portion.

5. The method for producing a rubber seal ring according to claim 1, characterized by comprising the steps of:

s1, preparing a sealing ring: carrying out banburying, open milling, molding and vulcanization on nitrile rubber, acrylate rubber, alkyd resin, carbon black, an anti-aging agent and sulfur according to a preset ratio to form the sealing ring;

s2, axial cutting: cutting the prepared sealing ring from top to bottom through a cutting ring to form an inner ring body and an outer ring body;

s3, slotting: an annular telescopic groove is formed in the middle of the outer side of the inner ring body; then a plurality of pairs of annular bonding grooves corresponding in position are respectively formed on the upper ring surface and the lower ring surface on the inner side of the outer ring body and the outer side of the inner ring body;

s4, preparing a bonding material: adding polyurethane, epoxy resin and flax short fiber into water according to a ratio, and uniformly stirring and mixing to form a pasty bonding material;

s5, bonding and curing: filling brushing adhesive on the annular adhesive grooves on the inner side of the outer ring body and the outer side of the inner ring body; and then, the outer ring body is arranged on the peripheral outer side of the inner ring body, so that the bonding materials on the annular bonding grooves on the inner side of the outer ring body and the outer side of the inner ring body are butted, and then, the rubber sealing ring is heated and cured to form the rubber sealing ring.

6. The method for preparing a rubber sealing ring according to claim 5, wherein the depth of the annular expansion groove formed in the step S3 is 2/5 to 3/5 of the radial thickness of the inner ring body.

7. The method for preparing a rubber sealing ring according to claim 5, wherein the weight ratio of the total amount of the polyurethane, the epoxy resin and the flax short fibers in the step S4 to the water is 4-3: 1.

8. The method for producing a rubber seal ring according to claim 5, wherein the heating time in step S5 is 20 to 30min, and the heating temperature is 80 to 90 ℃.

Technical Field

The invention relates to a rubber sealing ring and a preparation method thereof.

Background

Most of sealing rings are made of soft materials such as rubber and the like, the sealing rings mainly provide sealing force by the elasticity of the materials to realize the sealing effect, the cross sections of the existing sealing rings are mostly in a standard circle shape or an oval shape, and the inner and outer circumferential surfaces of the existing sealing rings are extruded to form inner and outer sealing surfaces, so the sealing rings with the structure are widely applied to various industries due to convenient manufacture and low cost; however, the above-described seal ring is likely to undergo aged deformation and deterioration in stretchability after long-term use, and further, the effect of the seal contact is degraded, resulting in deterioration of sealing performance.

Disclosure of Invention

Aiming at the defects of the prior art, the invention solves the problems that: the rubber sealing ring with good elastic flexibility and good sealing effect and the preparation method thereof are provided.

In order to solve the problems, the technical scheme adopted by the invention is as follows:

a rubber sealing ring comprises an inner ring body, an outer ring body and an adhesive layer; an annular telescopic groove is formed in the outer side of the middle of the inner side ring body; the outer ring body is arranged on the outer side of the periphery of the inner ring body; a plurality of annular bonding grooves are respectively formed in the upper and lower ring surfaces of the inner side of the outer ring body and the outer side of the inner ring body; the annular bonding grooves on the inner side of the outer ring body and the outer side of the inner ring body are respectively butted; the annular bonding groove is filled with a bonding layer; the inner ring body and the outer ring body comprise the following components in parts by weight: 50-60 parts of nitrile rubber, 20-25 parts of acrylate rubber, 5-10 parts of alkyd resin, 2-5 parts of carbon black, 1-2 parts of anti-aging agent and 1-2 parts of sulfur; the adhesive layer comprises the following components in parts by weight: 50-60 parts of polyurethane, 10-20 parts of epoxy resin and 50-100 parts of flax short fiber.

Furthermore, the sections of the inner side ring body and the outer side ring body are both in a semicircular structure.

Furthermore, the section of the annular telescopic groove at the outer side in the middle of the inner side ring body is in a V-shaped structure with a large outer part and a small inner part.

Furthermore, the annular bonding grooves are of V-shaped structures with large outer parts and small inner parts.

A preparation method of a rubber sealing ring comprises the following steps:

s1, preparing a sealing ring: carrying out banburying, open milling, molding and vulcanization on nitrile rubber, acrylate rubber, alkyd resin, carbon black, an anti-aging agent and sulfur according to a preset ratio to form the sealing ring;

s2, axial cutting: cutting the prepared sealing ring from top to bottom through a cutting ring to form an inner ring body and an outer ring body;

s3, slotting: an annular telescopic groove is formed in the middle of the outer side of the inner ring body; then a plurality of pairs of annular bonding grooves corresponding in position are respectively formed on the upper ring surface and the lower ring surface on the inner side of the outer ring body and the outer side of the inner ring body;

s4, preparing a bonding material: adding polyurethane, epoxy resin and flax short fiber into water according to a ratio, and uniformly stirring and mixing to form a pasty bonding material;

s5, bonding and curing: filling brushing adhesive on the annular adhesive grooves on the inner side of the outer ring body and the outer side of the inner ring body; and then, the outer ring body is arranged on the peripheral outer side of the inner ring body, so that the bonding materials on the annular bonding grooves on the inner side of the outer ring body and the outer side of the inner ring body are butted, and then, the rubber sealing ring is heated and cured to form the rubber sealing ring.

Further, the depth of the annular expansion groove opened in the step S3 is 2/5 to 3/5 of the radial thickness of the inner ring body.

Further, the weight ratio of the total amount of the polyurethane, the epoxy resin and the flax short fibers in the step S4 to water is 4-3: 1.

Further, in the step S5, the heating time is 20 to 30min, and the heating temperature is 80 to 90 ℃.

The invention has the advantages of

1. The structure and the process of the traditional rubber sealing ring are changed, the rubber sealing ring is longitudinally split to form the inner side ring body and the outer side ring body, the annular telescopic grooves are formed in the middle of the outer side of the inner side ring body, so that the flexibility of the inner side ring body is better, the inner side ring body is extruded after the shaft is inserted into the inner side ring body, the inner side ring body is attached to the outer side of the periphery of the shaft, and the sealing effect is more durable.

2. In order to improve the bonding stability of the inner ring body and the outer ring body and consider that the bonding strength cannot be too high to influence the flexibility of the inner ring body, a mixed system of three components of polyurethane, epoxy resin and flax short fibers is selected as a bonding material, firstly, the polyurethane and the epoxy resin provide certain bonding strength to reach certain tear resistance strength, and meanwhile, the flax short fibers are distributed in the bonding material in a staggered mode and have a soft characteristic, so that a network system with a plurality of interlaced flax short fibers is formed after curing, so that the whole bonding material has certain flexibility while certain strength is ensured, the hard property of the bonding material is reduced, and the inner ring body has certain flexibility.

Drawings

FIG. 1 is a schematic cross-sectional view of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.