阅读说明：本技术 一种运动鞋底复合成型工艺 (Composite forming process for sports shoe soles ) 是由 许秀政 许沐闳 刘剑明 石太伟 于 2021-09-01 设计创作，主要内容包括：本发明公开了一种运动鞋底复合成型工艺,步骤包括预浸料制备、清洁PA膜、等离子表面处理、贴合预成型、热压成型和冷却脱模,本发明采用PA膜和预浸料复合,制得的成品表面无孔,且抗磨能力和抗疲劳能力均增强,在复合前先对PA膜进行等离子表面处理,通过刻蚀作用增加PA膜的表面粗糙度,提高其粘结性能,从而提高复合材料的整体性能。(The invention discloses a composite forming process of a sports shoe sole, which comprises the steps of prepreg preparation, PA film cleaning, plasma surface treatment, lamination preforming, hot-press forming and cooling demoulding.)

1. A composite molding process of a sports shoe sole is characterized by comprising the following steps:

1) and preparing a prepreg: preparing a prepreg from carbon fiber wires and epoxy resin through coating and pressing equipment, and cutting the size and the shape of the prepreg;

2) cleaning a PA film: removing dust on the surface of the PA film by using an air gun, wiping the PA film by using cotton cloth and alcohol, and drying for later use;

3) and plasma surface treatment: contacting the PA film with the flame of a plasma surface treatment machine on the surface needing to be compounded with the prepreg, and enabling the flame to uniformly contact and treat all parts on the compounding surface through transverse and longitudinal uniform movement, wherein the contact time of the flame on all parts on the compounding surface is less than 1 s;

4) and laminating preforming: attaching the PA film subjected to the plasma surface treatment to a prepreg, and then, carrying out suction compaction on the PA film and the prepreg by using a vacuum machine and discharging interlayer bubbles to prepare a preformed blank;

5) and hot-press forming: installing a die, heating to 150 ℃, putting the preformed blank into the die, laminating, and carrying out pressure molding to obtain a product rough blank;

6) and cooling and demolding: and (5) cooling the product rough blank by using an air gun after the mold is opened, and then taking out the product.

2. The composite molding process of sports shoe sole according to claim 1, wherein in the step of plasma surface treatment, the working power of the plasma surface treatment machine is 80-100W, the working time is 2-4min, and the gas for combustion is two or more of oxygen, hydrogen, nitrogen, helium and ammonia.

Technical Field

The invention relates to a sole molding process, in particular to a composite molding process of a sports sole.

Background

At present, the soles of sports shoes such as spiked shoes on the market are mostly formed by plastic injection molding technology, the soles have good bending fatigue and wear resistance, but lack of quick bending resilience performance or resilience, and the resilience rate and force of the soles are direct feedback of the shoes to the soles.

The carbon fiber resin reinforced composite material has good rebound resilience, but in both bending fatigue and wear resistance, the thermosetting resin is obviously not higher than the thermoplastic resin, and can not maintain good bending fatigue under extreme conditions (such as-10 ℃).

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides a composite molding process of a sports shoe sole, which has enhanced wear resistance and fatigue resistance.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a composite molding process of a sports shoe sole comprises the following steps:

1) and preparing a prepreg: and (3) preparing a prepreg by using carbon fiber wires and epoxy resin through coating and pressing equipment, and cutting the size and the shape of the prepreg.

2) Cleaning a PA film: and removing dust on the surface of the PA film by using an air gun, wiping the PA film by using cotton cloth and alcohol, and drying for later use.

3) And plasma surface treatment: and (3) contacting the PA film with the flame of a plasma surface treatment machine on the surface needing to be compounded with the prepreg, and uniformly contacting and treating all parts on the compounding surface by transversely and longitudinally uniformly moving the flame, wherein the contact time of the flame on all parts on the compounding surface is less than 1 s.

4) And laminating preforming: and (3) attaching the PA film subjected to the plasma surface treatment to the prepreg, and then, tightly sucking the prepreg by using a vacuum machine and discharging interlayer bubbles to obtain a preformed blank.

5) And hot-press forming: and (3) installing a die, heating to 150 ℃, putting the preformed blank into the die, laminating, and carrying out pressure forming to obtain a product rough blank.

6) And cooling and demolding: and (5) cooling the product rough blank by using an air gun after the mold is opened, and then taking out the product.

In the step of plasma surface treatment, the working power of the plasma surface treatment machine is 80-100W, the working time is 2-4min, and the gas for combustion is two or more of oxygen, hydrogen, nitrogen, helium and ammonia.

The invention has the beneficial effects that: the composite forming process comprises the steps of pre-soaking material preparation, PA film cleaning, plasma surface treatment, lamination pre-forming, hot press forming and cooling demoulding, wherein the PA film and the pre-soaking material are compounded, the surface of the prepared finished product is nonporous, the abrasion resistance and the fatigue resistance are enhanced, the plasma surface treatment is carried out on the PA film before compounding, the surface roughness of the PA film is increased through the etching effect, the bonding property is improved, and the overall performance of the composite material is improved.

Detailed Description

In the present example, the temperature and pressure are not particularly emphasized, and both are normal temperature and normal pressure.

A composite molding process of a sports shoe sole comprises the following steps:

1) and preparing a prepreg: and (3) preparing a prepreg by using carbon fiber wires and epoxy resin through coating and pressing equipment, and cutting the size and the shape of the prepreg.

2) Cleaning a PA film: and removing dust on the surface of the PA film by using an air gun, wiping the PA film by using cotton cloth and alcohol, and drying for later use.

3) And plasma surface treatment: and (3) contacting the PA film with the flame of a plasma surface treatment machine on the surface needing to be compounded with the prepreg, and uniformly contacting and treating all parts on the compounding surface by transversely and longitudinally uniformly moving the flame, wherein the contact time of the flame on all parts on the compounding surface is less than 1 s.

4) And laminating preforming: and (3) attaching the PA film subjected to the plasma surface treatment to the prepreg, and then, tightly sucking the prepreg by using a vacuum machine and discharging interlayer bubbles to obtain a preformed blank.

5) And hot-press forming: and (3) installing a die, heating to 150 ℃, putting the preformed blank into the die, laminating, and carrying out pressure forming to obtain a product rough blank.

6) And cooling and demolding: and (5) cooling the product rough blank by using an air gun after the mold is opened, and then taking out the product.

In the step of plasma surface treatment, the working power of the plasma surface treatment machine is 80-100W, the working time is 2-4min, and the gas for combustion is two or more of oxygen, hydrogen, nitrogen, helium and ammonia.

Because the PA film is highly oriented and crystallized to make the fiber surface smooth and flat, and lacks chemical active groups, resulting in poor interfacial bonding performance between the fiber and the resin, it is necessary to modify the surface of the PA film to improve the interfacial bonding strength, thereby improving the overall performance of the composite material. The plasma surface treatment generates an etching effect on the surface of the PA film, and the etching effect removes a weak layer or low-molecular fragments on the surface of the PA film so as to generate chain segment shearing, so that tiny concave-convex shapes are generated on the surface, and the concave-convex shapes are favorable for bonding the PA film and the prepreg. Active particles in plasma treatment can break chemical bonds on the surface of the PA film to form crosslinking, the content of carbon elements on the surface of the PA film is reduced, and polar groups (such as nitrogen-containing polar groups introduced on the surface of the PA film by ammonia gas) are introduced, so that the content of the polar groups on the surface of the PA film is increased, an obvious etching effect is generated, the surface roughness is increased, the free energy is increased, and the bonding performance is improved.

Table 1 shows the parameters and the values of surface roughness Ra of the various examples

Examples	power/W	Time/min	Gas (es)	Ra/nm
					Untreated	/	/	/	115.86
1	80	4	Oxygen and ammonia	130.61
					2	100	2	Oxygen and ammonia	133.26
3	100	4	Oxygen and ammonia	150.66
					4	80	4	Oxygen, helium	128.54
5	100	2	Oxygen, helium	128.98
					6	100	4	Oxygen, helium	148.78
7	100	4	Oxygen, hydrogen	144.11
					8	100	4	Oxygen and nitrogen	147.99

The number of the surface irregularities and grooves of the PA film after the plasma treatment increases, and the Ra value increases. The Ra value increases with increasing power and processing time, indicating that the longer the plasma treatment time, the deeper the PA film is etched, increasing the contact area of the PA film with the prepreg, enhancing the mechanical engagement, and improving the interfacial adhesion between the PA film and the prepreg. However, when the treatment time is too long, the surface of the PA film is further etched by the plasma treatment, so that a layer of fibers on the surface of the PA film is peeled off, and a smoother surface is generated.

The prepreg preparation can be carried out by the following specific steps:

1) and preparing epoxy resin: adding o-cresol novolac epoxy resin into a heating dispersion machine, heating to 125-135 ℃ for melting, then adding bisphenol A epoxy resin, mixing uniformly, cooling to 105-115 ℃, adding an epoxy toughening agent, mixing uniformly, cooling to 60-80 ℃, adding a proper amount of curing agent and accelerator, mixing uniformly to obtain a mixture, then pouring the mixed epoxy resin into a mold preheated to 65-75 ℃, and obtaining the epoxy resin after vacuum degassing.

2) And preparing a prepreg: adding epoxy resin and carbon fiber into a coating and pressing device, and preparing prepreg at the gluing temperature of 55-75 ℃ and the impregnation temperature of 65-85 ℃ respectively.

When in use, the prepreg can be directly laid according to the shape of a mould, and can form a composite material after being heated and cured together with other materials without being soaked with epoxy resin again. The conventional prepreg usually adopts a high-temperature curing process, but the energy consumption of the high-temperature curing process is usually high, so that the manufacturing cost of the prepreg is too high. In addition, high temperature curing can result in large internal stress in the finished product, resulting in large dimensional deviation of the product and high requirements for the mold. The embodiment sets the medium-low temperature curing temperature of 60-80 ℃, can reduce the internal stress generated in the curing process, has low requirements on production equipment and auxiliary materials, has short production period and high dimensional stability, and improves the production efficiency of the composite material. In addition, the embodiment adopts two steps of hot melting and presoaking, and the prepared prepreg has uniform and flat appearance and no hole on the surface.

The composite forming process comprises the steps of pre-soaking material preparation, PA film cleaning, plasma surface treatment, laminating pre-forming, hot press forming and cooling demolding, the PA film and the pre-soaking material are compounded, the surface of a prepared finished product is nonporous, the abrasion resistance and the fatigue resistance are enhanced, the plasma surface treatment is carried out on the PA film before compounding, the surface roughness of the PA film is increased through the etching effect, the bonding performance is improved, and therefore the overall performance of the composite material is improved.

The above embodiments do not limit the scope of the present invention, and those skilled in the art can make equivalent modifications and variations without departing from the overall concept of the present invention.