CN115519816A

CN115519816A - 3D printing shoe material coated with thin film and preparation method and application thereof

Info

Publication number: CN115519816A
Application number: CN202211138797.2A
Authority: CN
Inventors: 徐咏春; 郑钟强; 王欢
Original assignee: Guangdong Yuxin New Materials Co ltd
Current assignee: Guangdong Yuxin New Materials Co ltd
Priority date: 2022-09-19
Filing date: 2022-09-19
Publication date: 2022-12-27

Abstract

The invention discloses a 3D printing shoe material coated with a film, and a preparation method and application thereof. The 3D printing shoe material coated with the film, provided by the invention, aims at the problems that the hollow structure of the 3D printing insole is difficult to clean and the color is single, and the 3D printing insole is coated with the composite film, so that the structure of the 3D printing insole can be protected, dirt and scale can be prevented from being stored, the 3D printing insole is easy to maintain, and meanwhile, a richer appearance color effect can be provided; and the preparation method has few steps, is simple and convenient to operate and is easy to realize industrial production.

Description

3D printing shoe material coated with thin film and preparation method and application thereof

Technical Field

The invention relates to the technical field of sole manufacturing, in particular to a 3D printing shoe material coated with a film and a preparation method and application thereof.

Background

The 3D printing technology has been applied to a variety of technical fields, including naval vessels, aerospace technology, medicine, housing construction, electronic products, and daily necessities. Among them, shoes molded by using the 3D printing technology have been sold in the market, and there are also many patent technologies reported about 3D printing soles. As can be seen, 3D printing technology has become one of the technologies of choice in the field of shoe manufacturing.

In addition, rubber films such as TPU films are common raw materials for shoe sole manufacture. In the process of manufacturing the sole, the TPU film is firstly molded into a preset shape, and then foaming or filling of other shoe materials is carried out in the molded TPU device. For example, patent document CN108544775a discloses a plastic-suction molding process for a shock-absorbing midsole, which comprises heating and softening a TPU film with a thickness of 1.0mm to 4.0mm, plastic-suction molding, cooling and shaping to obtain a TPU container, filling the TPU container with ETPU particles, and covering the TPU container with a thin TPU film to seal the TPU container to obtain the shock-absorbing midsole.

In the prior art, a TPU film is generally formed firstly and then is used for manufacturing a follow-up sole, and the TPU film is arranged inside a sole mold. This method of operation is not suitable for 3D printing of shoe soles. The 3D printing sole is prefabricated by using 3D printing equipment, and is a new process for manufacturing the sole. However, the 3D printed soles are generally provided with hollow structures, so that dirt and dirt are easily stored in the wearing process; and, the sole colour that 3D printed is single.

Disclosure of Invention

In order to overcome the defects of the prior art, one of the purposes of the invention is to provide a 3D printing shoe material coated with a thin film.

The invention also aims to provide a manufacturing method of the 3D printing shoe material coated with the film.

The invention also aims to provide application of the 3D printing shoe material coated with the film.

One of the purposes of the invention is realized by adopting the following technical scheme:

the utility model provides a 3D who has the film prints shoes material, includes 3D and prints insole and film, is in at least the bottom and the lateral part of 3D printing insole are attached to have the film. The colour comparison of 3D printing insole is single, and the film can be multiple colour, gradual change look, flash of light, mute light etc. can also set up multiple pattern on the film, and the attached film on the single 3D of colour prints the insole, can increase the outward appearance color of 3D printing sole, richenes the outward appearance of prefabricated insole. In addition, if 3D prints the sole and has hollow out construction, after having set up the film, the film can prevent effectively that debris such as dirty, little stone from falling into hollow out construction, the clean of the sole of being convenient for is managed.

In the present invention, "attached" refers to that the film and the 3D printing midsole are closely attached, for example, the two are closely attached together through a vacuum adsorption process. An adhesive or no adhesive may be provided between the 3D printing midsole and the film. For example, the film is attached to the 3D printing midsole by heating the film to soften and then vacuum adsorbing, wherein the 3D printing midsole and the film are free of adhesive.

As a preferable scheme of the invention, the film is attached to the bottom and the side of the 3D printing insole through a vacuum adsorption process, and is attached through the vacuum adsorption process, so that the attaching performance is good, the insole is tightly attached, and the insole is environment-friendly.

As a preferable scheme of the invention, the thin film is a TPU film or a TPE film, and the TPU film or the TPE film has better thermal plasticity and elastic property. In the present invention, the film includes, but is not limited to, TPU film or TPE film, and a film having good thermal plasticity and elasticity may be selected. In the invention, the TPU film does not need to be a high-low temperature composite TPU film with a hot melt adhesive layer, so that a hot melt adhesive can be omitted, and when the TPU film without the hot melt adhesive is compounded with the 3D printing insole, the TPU film is firstly heated and softened and then is attached to the 3D printing insole which is brushed with the treating agent, so that the effect of good laminating property can be realized.

According to a preferable scheme of the invention, the thickness of the film is 0.2-2mm, the thickness is proper, and the film can be well attached to the 3D printing insole and is not easy to separate and detach.

As a preferred embodiment of the present invention, the 3D printing midsole is an Acrylonitrile Butadiene Styrene (ABS) 3D printing midsole, a polyurethane 3D printing midsole or a nylon 3D printing midsole. More preferably a TPU midsole or a nylon midsole. Adopt the 3D of above-mentioned material to print the insole, the comfortable quality of insole is good, and great with the direct adhesive strength of film, is difficult for droing.

As a preferable scheme of the invention, the 3D printing midsole is provided with a hollowed-out structure. 3D prints the insole and is provided with hollow out construction and can reduce the weight in insole, makes the sole lighter and graceful, reduces and wears heavy burden. Set up 3D behind the hollow out construction and print the insole, because its bottom and lateral part are attached to have the film, can avoid debris such as dirty, small stone to fall into hollow out construction well, be convenient for clear up.

As a preferable scheme of the present invention, the 3D printing midsole is formed by a LOM layered solid manufacturing process, an FDM fused deposition manufacturing process, an SLA laser curing process, a 3DP three-dimensional printing forming process, or an SLS selective laser powder sintering process.

The second purpose of the invention is realized by adopting the following technical scheme:

a preparation method of a 3D printing shoe material coated with a thin film comprises the following steps:

manufacturing a middle sole: manufacturing a 3D printing insole by using a 3D printing process;

cleaning the insole: cleaning the 3D printing insole, and then drying;

brush treatment agent: coating or spraying a treating agent on the bottom and the side surface of the cleaned 3D printing insole, and drying;

and (3) loading: placing the 3D printing insole with the treating agent on a plastic suction mould of a plastic suction machine, and mounting the cut film on a clamp holder of the plastic suction machine;

heating and pumping: setting a preset program for the plastic suction machine, starting the program, heating the film to be softened, then performing vacuum suction to enable the softened film to be tightly attached to the 3D printing insole, keeping vacuum, then cooling by blowing cold air, and taking out after the preset program is finished.

In the production method of the present invention, the suction molding machine used in the heating and suction step, through which processes such as heating, vacuum (suction), cooling by blowing, and the like, involved in the heating and suction step, may be implemented, may be a conventional suction molding machine, for example, a suction molding machine used in the manufacture of bags and suitcases.

As a preferable scheme of the invention, the preparation method of the 3D printing shoe material coated with the thin film comprises the following steps:

manufacturing a middle sole: manufacturing a 3D printing insole by using a 3D printing process, wherein the 3D printing insole is provided with a hollow structure;

cleaning the insole: cleaning the 3D printing insole with a solvent, removing impurities such as dust and a release agent remaining on the 3D printing insole, and drying; the solvent is a quick-drying solvent, such as tripropylene glycol methyl ether, isopropanol, absolute ethyl alcohol or acetone;

brush treatment agent: coating or spraying a treating agent on the bottom and the side surface of the cleaned 3D printing insole, and drying at 60-90 ℃, wherein the solvent in the treating agent is dried at low temperature without generating bubbles, so that the product quality is improved; the treating agent is a water-based adhesive or a water-based bridging agent, and the water-based adhesive or the water-based bridging agent can be used for attaching a film on the surface of the 3D material, so that the bonding fastness of the 3D printing insole and the film (such as a polyurethane composite film) is improved;

and (3) loading: placing the 3D printing insole with the treating agent on a plastic suction mould of a plastic suction machine, wherein the bottom surface of the 3D printing insole faces upwards; mounting the cut film on a holder of the plastic suction machine, wherein the holder is arranged above the plastic suction mould; in the invention, the holder is arranged above the plastic suction mould, the upper part comprises a right upper part or a non-right upper part, the holder is positioned above the plastic suction mould in the longitudinal direction, and when a program is started, the holder can automatically move to the right upper part of the plastic suction mould, so that a film can correspond to a 3D printing insole conveniently;

heating and pumping: setting a preset program for the plastic uptake machine, starting the program, heating the film to be softened, then performing vacuum suction to enable the softened film to be tightly attached to the 3D printing insole, keeping vacuum, then cooling by blowing cold air, and taking out after the preset program is finished; the preset program is as follows: the heating temperature is 150-180 ℃, the heating time is 10-30 seconds, the vacuum time is 50-150 seconds, and the cold air blowing time is 30-80 seconds.

The preset program is set, so that the film can be guaranteed to be softened, free stretching is realized, and the insole can be attached to the film conveniently. And (3) cooling the film by blowing air to accelerate the film forming.

As a preferable scheme of the invention, the method further comprises a trimming step, wherein after the heating and sucking step is completed, the 3D printing shoe material coated with the thin film is taken out, and the redundant thin film is trimmed.

The third purpose of the invention is realized by adopting the following technical scheme:

the invention also provides application of the 3D printing shoe material coated with the film in sole manufacturing.

A sole comprises a 3D printing shoe material coated with a thin film, wherein a shoe outsole is arranged at the bottom of the 3D printing shoe material.

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

(1) According to the 3D printing shoe material coated with the film, provided by the invention, aiming at the problems that the hollow structure of the 3D printing insole is difficult to clean and the color is single, the 3D printing insole is coated with the composite film, so that the structure of the 3D printing insole can be protected, dirt and dirt are prevented from being stored, the maintenance is easy, and meanwhile, a richer appearance color effect can be provided.

(2) The preparation method of the 3D printing shoe material coated with the thin film comprises the steps of cleaning a manufactured insole, brushing a surface treating agent, drying, placing on a mold of a plastic uptake machine, heating the thin film (such as a polyurethane composite thin film), attaching the film to the insole after the film is softened, performing vacuum suction to enable the polyurethane composite thin film to be tightly attached to the insole, cooling and shaping, taking down the insole, and trimming redundant thin films to obtain the insole coated with the polyurethane composite thin film. The whole process has few steps, is simple and convenient to operate and is easy to realize industrial production.

Drawings

FIG. 1 is a diagram illustrating a 3D printed midsole coating film according to an embodiment of the invention;

fig. 2 is a top view of a 3D printed midsole coating film according to example 1 of the present invention;

fig. 3 is a bottom view of a 3D printed midsole coating film according to embodiment 1 of the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict. The raw materials, equipments and the like used in the following examples are commercially available unless otherwise specified.

Example 1

The utility model provides a 3D who has the film prints shoes material, includes 3D and prints insole and film, has the film at the bottom and the lateral part of 3D printing insole. The preparation method comprises the following steps:

manufacturing a middle sole: the 3D printing insole is manufactured by using a 3D printing process, the 3D printing insole is made of polyurethane, and the 3D printing insole is provided with a hollow structure;

cleaning the insole: cleaning the 3D printing insole with isopropanol, removing impurities such as dust and release agent remaining on the 3D printing insole, and drying;

brush treatment agent: the cleaned 3D printing midsole is sprayed with a layer of treating agent (selected from water-based polyurethane emulsion DISPERCOLL U54 of Germany Bayer company) at the bottom and the side surface, and is dried at 75 ℃, and the solvent in the treating agent is dried at low temperature without generating bubbles, so that the product quality is improved;

and (3) loading: placing the 3D printing insole with the treating agent on a plastic suction mould of a plastic suction machine, wherein the bottom surface of the 3D printing insole faces upwards; mounting the cut polyurethane film (TPU film) with the thickness of 1.5mm on a clamp holder of the plastic uptake machine;

heating and pumping: setting preset programs (the heating temperature is 165 ℃, the heating time is 20 seconds, the vacuum time is 100 seconds, and the cold air blowing time is 50 seconds) for the plastic suction machine, starting the programs, heating the polyurethane film to be softened, then carrying out vacuum suction, enabling the softened polyurethane film to be tightly attached to the 3D printing insole, keeping the vacuum, then cooling by blowing cold air, and taking out after the preset programs are finished;

trimming and drying: trimming the redundant film at the edge, and finely trimming to obtain the finished product.

Fig. 1 is a diagram illustrating a 3D printed midsole coating film provided in example 1 before printing; fig. 2-3 are illustrations of the 3D printed midsole coating film provided in example 1. As can be seen from fig. 2-3, the film covers the bottom and sides of the 3D printed midsole and covers a portion of the top, the film being in close proximity to the bottom and sides of the 3D printed midsole.

Example 2

The utility model provides a 3D who has the coating film prints shoes material, includes 3D and prints insole and film, has the film at the bottom and the lateral part of 3D printing insole. The preparation method comprises the following steps:

manufacturing a middle sole: manufacturing a 3D printing insole by using a 3D printing process, wherein the 3D printing insole is made of nylon and is provided with a hollow structure;

cleaning the insole: cleaning the 3D printing insole with absolute ethyl alcohol, removing impurities such as dust and release agent remaining on the 3D printing insole, and drying;

brushing treating agent: taking the cleaned 3D printing midsole, spraying a layer of treating agent (selected from water-based polyurethane emulsion DISPERCOLL U54 of Bayer company in Germany) on the bottom and the side surface of the midsole, drying at 90 ℃, and drying the treating agent at low temperature without generating bubbles in a solvent, thereby improving the product quality;

and (3) loading: placing the 3D printing insole with the treating agent on a plastic suction mould of a plastic suction machine, wherein the bottom surface of the 3D printing insole faces upwards; mounting the cut TPE film with the thickness of 2mm on a clamp holder of the plastic uptake machine;

heating and pumping: setting preset programs (the heating temperature is 150 ℃, the heating time is 30 seconds, the vacuum time is 150 seconds, and the cold air blowing time is 80 seconds) for the plastic suction machine, starting the programs, heating the TPE film to be softened, then carrying out vacuum suction, enabling the softened TPE film to be tightly attached to the 3D printing insole, keeping the vacuum, then cooling by blowing cold air, and taking out after the preset programs are finished;

Example 3

A sole comprises a 3D printing shoe material coated with a film prepared in embodiment 1 and an outsole, wherein the outsole is arranged at the bottom of the 3D printing shoe material and fixed through an adhesive.

Comparative example 1

Comparative example 1 differs from example 1 in that: the step of brushing the treating agent is omitted; in the step of loading, a layer of adhesive is brushed on the TPU film and then the TPU film is installed on a clamper; during vacuum suction, a heating program is not started, the TPU film is not required to be heated and softened, vacuum suction is directly performed, and the TPU film and the 3D printing insole are combined through the adhesive.

Comparative example 2

Comparative example 2 differs from example 1 in that: in the step of brushing the treating agent, the treating agent is methanol. The rest is the same as in example 1.

Comparative example 3

Comparative example 3 differs from example 1 in that: in the step of brushing the treating agent, the treating agent is alcohol. The rest is the same as in example 1.

Comparative example 4

Comparative example 4 differs from example 1 in that: in the step of brushing the treating agent, drying is not carried out at low temperature but at 100 ℃ after brushing the treating agent. The rest was the same as in example 1.

Effect verification

1. Measurement of peeling Strength

Samples of the shoe materials obtained in examples 1-2 and comparative examples 1-4 were taken, respectively, and the peel strength between the film and the 3D-printed midsole was tested to analyze the adhesion fastness between the film and the 3D-printed midsole. The instrument adopted for the peeling strength is a tension tester, and the tension value of the film when being peeled from the printing insole is tested by the tension tester. The larger the tensile value, the better the adhesion between the film and the 3D printed midsole. During testing, a sole sample is taken, the width of the cut sample is 10mm, a tension test is started until the film is separated from the 3D printed insole, the tension value is recorded, and the tearing condition is observed. The results are shown in table 1 below.

TABLE 1 tension value result recording table

In the tension test, if the film is separated from the 3D printing insole, the 3D printing layer is broken and adhered to the film, and the tension value is more than 2.0kgf, the product is evaluated to reach the standard, and the adhesion fastness is over-closed. As can be seen from the table 1, the tensile values of the samples of examples 1 and 2 are both greater than 2.0kgf, indicating that the shoe materials of examples 1 and 2 exhibit better adhesion between the film and the 3D printed midsole. The shoe materials of comparative examples 1-4, however, did not exhibit the same adhesion between the film and the 3D printed midsole as those of examples 1-2.

The comparative example 1 realizes the combination of the TPU film and the 3D printing insole through the adhesive, the peeling strength is reduced, the working procedures can be increased by using the adhesive, the cost is increased, and the adhesive is not beneficial to environmental protection.

Comparative example 2 adopts methyl alcohol as the finishing agent, and phenomenons such as the powder, crack can appear in the work piece, influence the adhesion fastness between film and the 3D printing insole to methyl alcohol can make the work piece warp, shrink, soften, influence product quality, and methyl alcohol can make people's eyesight descend simultaneously, and long-term use can lead to two mesh insomnia, even carcinogenesis.

In comparative example 3, alcohol is used as a treating agent, and the water in the alcohol can separate out the resin which is not completely cured on the printing workpiece in a powder form, because the resin is hydrophilic, the hydroxyl in the water reacts with the components in the resin, so that the film forming of the treating agent on the surface of the 3D material is influenced, and the bonding fastness between the insole and the film in the 3D printing is reduced.

Comparative example 4 after brushing the treating agent, the drying temperature is 100 ℃, and low-temperature drying is not adopted, so that the solvent in the treating agent generates bubbles in the drying process, the film formation of the treating agent on the surface of the 3D material is influenced, and the bonding fastness between the insole and the film in the 3D printing is reduced.

2. Aging and flexing resistance test

The shoe material samples obtained in examples 1 to 2 and comparative examples 1 to 4 were subjected to aging resistance test and flexing resistance test, respectively. The results are shown in Table 2 below.

And (3) aging resistance test: the test sample is placed in a constant temperature and humidity environment for 1 week, the temperature is 75 +/-1 ℃, and the humidity is 90 +/-1%.

And (3) bending resistance test: the method is carried out according to the folding endurance performance of the GB T3903.1-2017 shoe integral test method.

TABLE 2 test results of aging and flexing resistance

As can be seen from the records in Table 2, the shoe material samples of examples 1-2 still have strong adhesion strength between the film and the 3D printing insole after being left at high temperature for a long time, are not easy to bulge, and have good quality.

The above embodiments are only preferred embodiments of the present invention, and the scope of the present invention should not be limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are intended to be covered by the claims.

Claims

1. The 3D printing shoe material coated with the thin film is characterized by comprising a 3D printing insole and the thin film, wherein the thin film is attached to the bottom and the side of the 3D printing insole.

2. The film-coated 3D printing shoe material as claimed in claim 1, wherein the film is attached to the bottom and sides of the 3D printing midsole by a vacuum adsorption process.

3. The thin film coated 3D printing footwear according to claim 1, wherein the thin film is a TPU film or a TPE film.

4. The film coated 3D printing shoe material as claimed in claim 1, wherein the 3D printing midsole is an acrylonitrile-butadiene-styrene copolymer 3D printing midsole, a polyurethane 3D printing midsole or a nylon 3D printing midsole.

5. The film-coated 3D printing shoe material as claimed in claim 1, wherein the thickness of the film is 0.2-2 mm; the 3D printing insole is provided with a hollow structure.

6. Method for preparing a film coated 3D printing shoe material according to any of claims 1 to 5, comprising the steps of:

cleaning the insole: cleaning the 3D printing insole, and then drying;

heating and pumping: setting a preset program for the plastic uptake machine, starting the program, heating the film to be softened, then performing vacuum suction to enable the softened film to be tightly attached to the 3D printing insole, keeping vacuum, then cooling by blowing cold air, and taking out after the preset program is finished.

7. The preparation method of the 3D printing shoe material coated with the film as claimed in claim 6, comprising the steps of:

cleaning the insole: cleaning the 3D printing insole with a solvent, removing residual dust and a release agent on the 3D printing insole, and then drying; the solvent is tripropylene glycol methyl ether, isopropanol, absolute ethyl alcohol or acetone;

brushing treating agent: coating or spraying a treating agent on the bottom and the side of the cleaned 3D printing insole, and drying at 60-90 ℃; the treating agent is a water-based adhesive or a water-based bridging agent;

and (3) loading: placing the 3D printing insole with the treating agent on a plastic suction mould of a plastic suction machine, wherein the bottom surface of the 3D printing insole faces upwards; mounting the cut film on a clamp holder of the plastic uptake machine, wherein the clamp holder is arranged above the plastic uptake mold;

8. The method for preparing the 3D printing shoe material coated with the thin film according to claim 6, further comprising a trimming step, wherein after the heating and sucking step is completed, the 3D printing shoe material coated with the thin film is taken out, and the redundant thin film is trimmed.

9. Use of the film coated 3D printed footwear according to any of claims 1 to 5 in the manufacture of shoe soles.

10. A sole, characterized by comprising the film-coated 3D printing shoe material as claimed in any one of claims 1 to 5, wherein the bottom of the 3D printing shoe material is provided with an outsole.