阅读说明：本技术 一种高弹性小颗粒空心球及其制备工艺 (High-elasticity small-particle hollow sphere and preparation process thereof ) 是由 刘银实 于 2021-06-21 设计创作，主要内容包括：本发明涉及制造舒缓冲击及高弹性成型产品的材料领域,具体涉及一种高弹性小颗粒空心球及其制备工艺。本发明请求保护的高弹性小颗粒空心球的直径为3mm～10mm,空心球的材质为TPU或PVC,本发明空心球具有较高的弹性,由其填充制得的产品能够保持相对持久的弹性和减震感；本发明首次利用相对设置的气泡花辊,基于真空吸塑的方式,将两片薄膜分别吸附形成半球形后,将气泡花辊相互咬合转动,使得两片薄膜上的半球结合形成空心球,该工艺能够通过调整气泡花辊上半球形凹槽的直径而制备不同粒径的空心球,且该工艺不受材质的限制,能够将高弹性、无发泡的材质利用本发明工艺制成高弹性空心球。(The invention relates to the field of materials for manufacturing shock-relieving and high-elasticity molded products, in particular to a high-elasticity small-particle hollow sphere and a preparation process thereof. The diameter of the high-elasticity small-particle hollow sphere claimed by the invention is 3-10 mm, the hollow sphere is made of TPU or PVC, the hollow sphere has high elasticity, and a product filled with the hollow sphere can keep relatively lasting elasticity and shock absorption; according to the process, the oppositely arranged bubble flower rollers are firstly utilized, the two films are respectively adsorbed to form hemispheres based on a vacuum plastic sucking mode, then the bubble flower rollers are mutually occluded and rotated, so that the hemispheres on the two films are combined to form the hollow spheres, the process can prepare the hollow spheres with different particle sizes by adjusting the diameters of the hemispherical grooves on the bubble flower rollers, the process is not limited by materials, and the high-elasticity and non-foaming materials can be prepared into the high-elasticity hollow spheres by the process.)

1. The high-elasticity small-particle hollow sphere is characterized in that the diameter of the hollow sphere is 3-10 mm; the hollow ball is made of TPU or PVC.

2. A process for preparing the high-elasticity small-particle hollow sphere of claim 1, which comprises the following steps:

s1: respectively putting the thermoplastic resin into two extruders to respectively extrude flaky films; the thermoplastic resin is TPU or PVC;

s2: extruding the flaky films onto two oppositely arranged bubble embossing rollers, wherein a plurality of hemispherical grooves are formed in the bubble embossing rollers, and the bubble embossing rollers respectively adsorb the two films in a vacuum forming mode and form a plurality of hemispheres attached to the grooves on the films;

s3: before the two films are not solidified, the two oppositely arranged bubble embossing rollers are mutually occluded and rotated, so that hemispheres on the two films are combined to form hollow spheres;

s4: and cutting the hollow spheres on the film into single-particle hollow spheres to obtain the high-elasticity small-particle hollow spheres.

3. The process for preparing hollow spheres of high elasticity and small particles as claimed in claim 2, wherein the thickness of the thin film extruded through the extruder is 0.2mm to 1.0mm in the step S1.

4. The process for preparing high-elasticity small-particle hollow spheres as claimed in claim 2, wherein the temperature of the step S1 for extruding the thermoplastic resin into the film depends on the hardness of the thermoplastic resin, and when the hardness of the thermoplastic resin is 65-95 degrees, the temperature of the feeding section of the extruder is 150-180 degrees, the temperature of the extruding section is 160-190 degrees, the temperature of the melting section is 170-200 degrees, and the temperature of the discharging opening is 150-180 degrees.

5. The process for preparing hollow spheres with small particles of high elasticity of claim 2, wherein the temperature of the bubble embossing roll is 20 to 50 ℃ when the bubble embossing roll performs vacuum forming on the film in step S2.

6. The process for preparing hollow spheres with high elasticity and small particles as claimed in claim 2, wherein in the step S2, the vacuum degree of the film vacuum-formed by the bubble embossing roller is 50-70 KPA.

7. The use of the small highly elastic particle hollow spheres of claim 1 in the preparation of impact resistant, highly elastic products.

8. The use of claim 7, wherein the impact-resistant and highly elastic product is prepared by filling the highly elastic small-particle hollow spheres in a corresponding mold.

Technical Field

The invention relates to the field of materials for manufacturing shock-relieving and high-elasticity molded products, in particular to a high-elasticity small-particle hollow sphere and a preparation process thereof.

Background

The prior materials for manufacturing the shock-relieving and high-elasticity molding products are generally elastomer materials, and the elastomer materials generally relate to non-foaming and foaming so as to meet the requirements of different occasions, such as buffering objects required in sports, medical treatment, toys, transportation and other occasions.

Most of the existing foaming elastomer materials are foaming sheets, are usually used for cushioning packaging of products and cannot be directly applied to the products; some non-foaming elastomers are hollow spheres, and the diameters of the hollow elastomers are usually larger, such as water inflatable walking balls, ocean balls, balls of children toys and the like in playgrounds, the spheres are usually formed by blow molding, and the particle size of the spherical elastomers prepared by the blow molding process is usually difficult to be 10mm or less, so that the conventional non-foaming elastomers are limited in application occasions and difficult to be applied to filling occasions, such as cushions of sports soles and the like; and the spherical elastomer prepared by the blow molding process has the advantages that the internal air is easy to leak through the injection molding opening, and the buffering performance of the spherical elastomer is greatly reduced.

Disclosure of Invention

Aiming at the problems in the prior art, the invention aims to provide a high-elasticity small-particle hollow sphere and a preparation process thereof, the particle size of the prepared high-elasticity small-particle hollow sphere is less than 10mm, and a product filled with the high-elasticity small-particle hollow sphere can keep relatively lasting elasticity and shock absorption feeling.

Based on the above purpose, the technical scheme adopted by the invention is as follows:

in a first aspect, the invention provides a high-elasticity small-particle hollow sphere, wherein the diameter of the hollow sphere is 3-10 mm; the hollow ball is made of TPU or PVC.

The hollow ball made of TPU (polyurethane) and PVC (polyvinyl chloride) has a relatively small particle size (3-10 mm) and high elasticity, and a product filled with the hollow ball can keep relatively lasting elasticity and shock absorption.

In a second aspect, the invention provides a preparation process of the high-elasticity small-particle hollow sphere, which comprises the following steps:

s1: respectively putting the thermoplastic resin into two extruders to respectively extrude flaky films; wherein the thermoplastic resin is TPU or PVC;

s2: extruding the flaky films onto two oppositely arranged bubble embossing rollers, wherein a plurality of hemispherical grooves are formed in the bubble embossing rollers, and the bubble embossing rollers respectively adsorb the two films in a vacuum forming mode and form a plurality of hemispheres attached to the grooves on the films;

s3: before the two films are not solidified, the two oppositely arranged bubble embossing rollers are mutually occluded and rotated, so that hemispheres on the two films are combined to form hollow spheres;

s4: and cutting the hollow spheres on the film into single-particle hollow spheres to obtain the high-elasticity small-particle hollow spheres.

The high-elasticity small-particle hollow spheres are prepared by utilizing the oppositely arranged bubble embossing rollers based on a vacuum forming mode, the preparation process can be suitable for the hollow spheres made of various materials, and the hollow spheres with different particle sizes can be obtained by adjusting the inner diameter of the spherical grooves in the bubble embossing rollers. Compared with the existing blow molding process, the hollow sphere prepared by the vacuum forming process has uniform sphere particle size and relatively controllable sphere wall thickness, and the wall thickness and the particle size uniformity of the sphere have very important functions on keeping the elasticity and the shock absorption feeling of a product prepared by the hollow sphere, so that the product prepared by filling the high-elasticity small-particle hollow sphere has good elasticity and lasting shock absorption feeling.

Further, in step S1, the thickness of the film extruded by the extruder is 0.2mm to 1.0 mm. After the size of the spherical groove on the bubble roller is fixed, the wall thickness of the high-elasticity small-particle hollow sphere can be effectively controlled by controlling the thickness of the film, and the relation between the thickness of the film and the wall thickness of the hollow sphere can be obtained through multiple tests according to different raw materials in the actual production process. For example, when TPU is used as a raw material and the diameter of a spherical groove on a bubble embossing roller is 5mm, under a certain vacuum degree, when the thickness of a film is 0.2mm, the wall thickness of a sphere formed after vacuum adsorption is 0.11 mm; when the thickness of the film is 0.4mm, the wall thickness of the sphere formed by vacuum adsorption is 0.22mm, so that the wall thickness of the hollow sphere can be indirectly controlled by adjusting the thickness of the film.

Further, the temperature at which the thermoplastic resin is extruded into the film in step S1 depends on the hardness of the thermoplastic resin, and when the hardness of the thermoplastic resin is 65 to 95 °, the temperature of the feeding section of the extruder is 150 to 180 °, the temperature of the extrusion section is 160 to 190 ℃, the temperature of the melting section is 170 to 200 ℃, and the temperature of the discharge opening is 150 to 180 ℃.

The corresponding extrusion film forming temperature is set according to the different hardness of the thermoplastic resin material, which is beneficial to the uniformity and stability of the film forming and the control of the thickness of the film.

Further, in step S2, when the bubble embossing roll performs vacuum forming of the film, the temperature of the bubble embossing roll is 20 to 50 ℃.

Further, in step S2, the vacuum degree of vacuum forming the film by the bubble embossing roller is 50-70 KPA. The wall thickness of the hollow ball formed by plastic suction can be adjusted and controlled by adjusting the vacuum degree of the film when the film is subjected to vacuum plastic suction through the bubble embossing roller.

In a third aspect, the invention provides application of the high-elasticity small-particle hollow sphere in preparation of impact-resistant and high-elasticity products.

Furthermore, the high-elasticity product with impact resistance and high elasticity is prepared by filling the high-elasticity small-particle hollow sphere into a corresponding model.

The diameter of the high-elasticity small-particle hollow sphere claimed by the invention is 3-10 mm, the hollow spheres prepared in the same batch have uniform particle size, and the product prepared by filling the hollow spheres in a corresponding model has high elasticity and keeps lasting shock absorption.

Compared with the prior art, the invention has the following beneficial effects:

according to the invention, the small-particle hollow spheres with the diameter of 3-10 mm are prepared from TPU or PVC and other materials for the first time, the prepared hollow spheres have high elasticity, and products filled with the hollow spheres can keep relatively lasting elasticity and shock absorption.

According to the process, the oppositely arranged bubble flower rollers are firstly utilized, the two films are respectively adsorbed to form hemispheres based on a vacuum plastic sucking mode, then the bubble flower rollers are mutually occluded and rotated, so that the hemispheres on the two films are combined to form the hollow spheres, the process can prepare the hollow spheres with different particle sizes by adjusting the diameters of the hemispherical grooves on the bubble flower rollers, the process is not limited by materials, and the high-elasticity and non-foaming materials can be prepared into the high-elasticity hollow spheres by the process.

Drawings

FIG. 1 is a schematic view of the structure of an extruder and a bubble embossing roll;

FIG. 2 is a photograph of the small highly elastic particle bubbles produced by the present invention.

In the figure, reference numerals 1 and 2 denote extruders, 3 and 4 denote bubble rolls, 5 denotes a vacuum suction port, and 6 denotes a cooling water circulation valve.

Detailed Description

To better illustrate the objects, aspects and advantages of the present invention, the present invention will be further described with reference to specific examples. It will be understood by those skilled in the art that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The test methods used in the examples are all conventional methods unless otherwise specified; the materials, reagents and the like used are commercially available unless otherwise specified.

Example 1

The embodiment provides a preparation process of a high-elasticity small-particle hollow sphere and the high-elasticity small-particle hollow sphere prepared by the preparation process.

The process for preparing the high-elasticity small-particle hollow sphere comprises the following steps:

s1: dehumidifying and drying the thermoplastic resin colloidal particles by a dehumidifier; wherein the plastic resin colloidal particles are TPU or PVC.

S2: extruding the dried thermoplastic resin colloidal particles to form two films by using two opposite extruders (1 and 2), wherein the temperature setting of the extruders depends on the hardness of the thermoplastic resin colloidal particles, and the temperatures set at different sections of the extruders are different due to different hardness, and are specifically shown in table 1; the thickness of the discharged film is adjusted by adjusting the gap of the die head of the discharge hole, and the thickness of the discharged film is controlled to be 0.2 mm-1.0 mm.

TABLE 1 temperature table for hardness of raw material and different sections of extruder

Hardness of raw material	Feed section (. degree.C.)	Extrusion section (. degree. C.)	Melting section (. degree.C.)	Discharge port (. degree. C.)
					65°	150	160	170	150
75°	160	170	180	160
					85°	170	180	190	170
95°	180	190	200	180

S3: the flaky thin films are extruded on the two oppositely arranged bubble embossing rollers (3 and 4), a plurality of hemispherical grooves are formed in the bubble embossing rollers, as shown in figure 1, the bubble embossing rollers respectively adsorb the two thin films in a vacuum suction manner, and a plurality of hemispheres attached to the grooves are formed in the thin films. Wherein, one side of the bubble embossing roller is a vacuum suction inlet (5), and the other side is provided with a cooling water circulating valve (6); the vacuum degree during vacuum forming is controlled to be 50-70 KPA, and the temperature of the bubble embossing roller is adjusted through a cooling water circulation valve according to the thickness of the film and the hardness of the original material, as shown in table 2.

S4: before two films have not solidified, rotate two bubble flower rollers interlock each other that will set up relatively, make the hemisphere on two films combine to form the clean shot, bubble flower roller still keeps the vacuum forming state this moment, along with the synchronous rotation of bubble flower roller, extruder, continuously forms a plurality of clean shots with two film laminating.

S5: and (3) conveying the attached film containing the hollow spheres by a conveying belt, cooling the film at 0-8 ℃ for 5-10 min, and drying to remove surface moisture.

S6: then cutting the hollow ball into single hollow ball particles by pressing the air pipe and then cutting for molding or pressing and cutting for molding by using a film high frequency, and the obtained hollow ball is shown in figure 2.

The diameter of the hollow ball can be determined according to the inner diameter of a spherical groove on the air bubble roller, and the diameter of the spherical groove can be set to be 3-10 mm, so that the high-elasticity small-particle hollow ball with the diameter range is prepared, and a product filled with the high-elasticity small-particle hollow ball can keep relatively lasting elasticity and shock absorption.

TABLE 2 correspondence table between film thickness, material hardness, and temperature of bubble embossing roll during vacuum forming

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.