阅读说明：本技术 一种热塑性弹性体脚轮及其注塑成型工艺 (Thermoplastic elastomer caster and injection molding process thereof ) 是由 欧阳庆生 易奎 于 2021-09-28 设计创作，主要内容包括：本发明涉及一种热塑性弹性体脚轮及其注塑成型工艺,由热塑性弹性体层、骨架层及轴承组成,轴承的外侧有用于支撑的骨架层,骨架层的外侧包裹有热塑性弹性体层,热塑性弹性体层内侧表面有若干间隔凸起。所述热塑性弹性体层和骨架层采用双色注塑成型工艺：将热塑性弹性体层材料和骨架层材料置于双色注塑机的两个料筒中,首先注塑热塑性弹性体层,然后注塑骨架层。本发明制备方法简单；热塑性弹性体层内侧表面有若干间隔凸起,能够将热塑性弹性体层和骨架层充分融合为一体,制备的脚轮承载力强且具有较好地缓冲性及耐磨性。(The invention relates to a thermoplastic elastomer caster and an injection molding process thereof. The thermoplastic elastomer layer and the framework layer adopt a double-shot injection molding process: the thermoplastic elastomer layer material and the skeleton layer material are placed in two charging barrels of a two-color injection molding machine, and the thermoplastic elastomer layer is firstly injected and then the skeleton layer is injected. The preparation method is simple; the inner surface of the thermoplastic elastomer layer is provided with a plurality of spaced bulges, so that the thermoplastic elastomer layer and the framework layer can be fully fused into a whole, and the prepared caster has strong bearing capacity and better buffering property and wear resistance.)

1. A thermoplastic elastomer caster, characterized by: the bearing is composed of a thermoplastic elastomer layer (1), a framework layer (2) and a bearing (3), wherein the framework layer (2) used for supporting is arranged on the outer side of the bearing (3), the thermoplastic elastomer layer (1) is wrapped on the outer side of the framework layer (2), and a plurality of spaced protrusions (4) are arranged on the inner side surface of the thermoplastic elastomer layer (1).

2. The thermoplastic elastomer caster of claim 1, wherein: the inner diameter of the bearing (3) is 4-60 mm.

3. The thermoplastic elastomer caster of claim 1, wherein: the thickness of the thermoplastic elastomer layer (1) is 0.5-100 mm.

4. The thermoplastic elastomer caster of claim 1, wherein: the thickness of the framework layer (2) is 2-130 mm.

5. The thermoplastic elastomer caster of claim 1, wherein: the thermoplastic elastomer layer (1) is made of one or more than two materials of thermoplastic elastomer, thermoplastic polyurethane elastomer, thermoplastic polyester elastomer and thermoplastic polyether elastomer.

6. The thermoplastic elastomer caster of claim 1, wherein: the framework layer (2) is made of one or more than two of Polyamide (PA), polypropylene (PP), acrylonitrile-butadiene-styrene plastic (ABS) and Polycarbonate (PC), and accounts for 20-95% of the total material.

7. The thermoplastic elastomer caster of claim 6, wherein: the framework layer (2) also comprises one or two of filling fiber and mineral, and the filling fiber and the mineral account for 5-60% of the framework material.

8. The method of manufacturing a thermoplastic elastomer caster according to claim 1, wherein: the thermoplastic elastomer layer (1) and the framework layer (2) are respectively placed in two charging barrels of a double-color injection molding machine by adopting a double-color injection molding process, the thermoplastic elastomer layer (1) is firstly injected, and then the framework layer (2) is injected.

9. The method of manufacturing a thermoplastic elastomer caster according to claim 8, wherein: the injection molding temperature of the thermoplastic elastomer layer (1) is 190-230 ℃, and the injection molding temperature of the framework layer (2) is 200-260 ℃.

Technical Field

The invention relates to a thermoplastic elastomer caster and an injection molding process thereof, belonging to the technical field of preparation of high polymer materials.

Background

With the continuous development of intelligent conveying equipment, the demand of the caster is more and more; thermoplastic elastomer casters are widely used in conveying equipment. The thermoplastic polyurethane elastomer has excellent wear resistance, and the thermoplastic polyurethane elastomer is wrapped on the framework, so that the polyurethane caster with high bearing capacity, good buffering performance and good wear resistance can be obtained.

The thermoplastic elastomer rubber coating is a process of coating a thermoplastic elastomer serving as a soft rubber on a hard rubber in an injection molding mode. The process is mainly used for producing double-color injection products such as handles, mobile phone shells, toys and stationery, and a layer of soft glue is coated on the hard plastic so as to achieve the effect of improving hand feeling. The injection molding process is low in cost and simple, and thus, is advantageous in mass production.

Most of the traditional thermoplastic elastomer rubber coating adopts injection molding of hard rubber and then injection molding of soft rubber, and because the melting points and polarities of the hard rubber and the soft rubber are greatly different, nylon cannot be coated well, and only a thin layer can be coated barely; if the thickness of polyurethane is large, the adhesion of polyurethane and nylon is insufficient, and the rubber is easily stripped. This is completely substandard for injection molded products with thicker lagging materials such as casters.

Disclosure of Invention

The invention aims to solve the problems and provides a thermoplastic elastomer caster and an injection molding process thereof.

The invention adopts the following technical scheme: a thermoplastic elastomer caster comprises a thermoplastic elastomer layer, a framework layer and a bearing, wherein the framework layer used for supporting is arranged on the outer side of the bearing, the thermoplastic elastomer layer is wrapped on the outer side of the framework layer, and a plurality of spaced bulges are arranged on the inner side surface of the thermoplastic elastomer layer.

Further, the inner diameter dimension of the bearing is 4-60 mm.

Further, the thickness of the thermoplastic elastomer layer is 0.5 to 100 mm.

Further, the thickness of the framework layer is 2-130 mm.

Furthermore, the thermoplastic elastomer layer is made of one or more than two materials of thermoplastic elastomer, thermoplastic polyurethane elastomer, thermoplastic polyester elastomer and thermoplastic polyether elastomer.

Furthermore, the framework layer is made of one or more of Polyamide (PA), polypropylene (PP), acrylonitrile-butadiene-styrene (ABS) plastic and Polycarbonate (PC), and accounts for 20-95% of the total material.

Further, the framework layer also comprises one or two of filling fiber and mineral, and the filling fiber and the mineral account for 5% -60% of the framework material.

The processing method of the thermoplastic elastomer caster comprises the steps of respectively placing a thermoplastic elastomer layer material and a framework layer material into two charging barrels of a double-color injection molding machine by adopting a double-color injection molding process, firstly, injecting the thermoplastic elastomer layer, and then, injecting the framework layer.

Further, the injection molding temperature of the thermoplastic elastomer layer is 190-230 ℃, and the injection molding temperature of the framework layer is 200-260 ℃.

The invention has the beneficial effects that: the preparation method is simple, the steps are easy to operate, the inner surface of the thermoplastic elastomer layer is provided with the plurality of spaced bulges, the thermoplastic elastomer layer and the framework layer can be fully fused into a whole, and the prepared caster has strong bearing capacity and better buffering property and wear resistance.

Drawings

Fig. 1 is a schematic view of the construction of the caster of the present invention.

FIG. 2 is a schematic representation of the structure of the thermoplastic elastomer layer of the present invention.

Reference numerals: 1-thermoplastic elastomer layer, 2-framework layer, 3-bearing and 4-interval bulge.

Detailed Description

The invention will be further explained and illustrated with reference to specific embodiments.

As shown in fig. 1-2, the thermoplastic elastomer caster comprises a thermoplastic elastomer layer 1, a skeleton layer 2 and a bearing 3, wherein the outside of the bearing 3 is provided with the skeleton layer 2 for supporting, the outside of the skeleton layer 2 is wrapped with the thermoplastic elastomer layer 1, the inside surface of the thermoplastic elastomer layer 1 is provided with a plurality of spaced protrusions 4, the inner diameter of the bearing 3 is 4-60 mm, the thickness of the thermoplastic elastomer layer 1 is 0.5-100 mm, and the thickness of the skeleton layer 2 is 2-130 mm. The thermoplastic elastomer layer 1 is made of one or more of thermoplastic elastomer, thermoplastic polyurethane elastomer, thermoplastic polyester elastomer and thermoplastic polyether elastomer. The framework layer 2 is made of one or more than two of Polyamide (PA), polypropylene (PP), acrylonitrile-butadiene-styrene plastic (ABS) and Polycarbonate (PC), and accounts for 20-95% of the total material. The framework layer 2 also comprises one or two of filling fiber and mineral, and the proportion of the filling fiber and the mineral accounts for 5-60% of the framework material.

The injection molding process comprises the following three steps:

the first embodiment is as follows: the thermoplastic polyurethane elastomer TPU and the framework material filled with 30% of fiber PA6 are dried for 3 hours at the temperature of about 100 ℃, and then are respectively added into two charging barrels of a two-color injection molding machine, the thermoplastic polyurethane elastomer TPU is firstly injected at the injection temperature of 200 plus 230 ℃, then the framework material PA6 is injected at the injection temperature of 200 plus 260 ℃, a plurality of spaced bulges are arranged on the inner side surface of the thermoplastic elastomer layer at intervals, the bulges are in an arc shape, and then the bulges are embedded into the framework layer after the framework layer is injected, so that the bulges are integrated with the framework layer.

The elastomeric castors finally obtained were tested: the hardness is 95A, and the volume abrasion is 18 mm³The peel force between the hard and soft gels was 1530N.

Example two:

drying a thermoplastic elastomer (TPE) and a framework material filled with 30% of fiber PA6 for 3 hours at about 100 ℃, then respectively adding the TPE and the framework material into two charging barrels of a two-color injection molding machine, firstly injecting the TPE at the injection temperature of 190 plus one material, then injecting the framework material PA6 at the injection temperature of 200 plus one material, wherein the inner side surface of the thermoplastic elastomer layer is provided with a plurality of spaced bulges which are arc-shaped, and then injecting the framework layer so that the bulges are embedded into the framework layer and are integrated with the framework layer.

The elastomeric castors finally obtained were tested: the hardness is 95A, and the volume abrasion is 69 mm³The peel force of the hard glue and the soft glue is 1500N.

Example three:

the thermoplastic polyurethane elastomer TPU and the framework material polycarbonate PC are dried for 3 hours at about 100 ℃, and then are respectively added into two charging barrels of a double-color injection molding machine, the thermoplastic polyurethane elastomer TPU is firstly injected at the injection temperature of 210 plus 240 ℃, then the framework material PC is injected at the injection temperature of 220 plus 270 ℃, a plurality of spaced bulges are arranged on the inner side surface of the thermoplastic elastomer layer, the bulges are in an arc shape, and then the bulges are embedded into the framework layer to be integrated with the framework layer after the framework layer is injected.

The elastomeric castors finally obtained were tested: the hardness is 95A, and the volume abrasion is 26 mm³The peel force between the hard glue and the soft glue is 1470N.