Method for 3D printing of single and composite photoresponse type plastic parts and application of 3D printing of single and composite photoresponse type plastic parts

Abstract

The invention belongs to the technical field of 3D printing, and particularly relates to a method for 3D printing of single and composite light response type plastic parts and application. The method for 3D printing of the single light response type plastic part comprises the specific steps that S1, the 3D printing single light response type plastic part or a plastic part is obtained; in the step S1, after the plastic part is obtained, the method further comprises the following sub-steps that A1, plastic powder and a fluorescent material are weighed, stirred and blended, and mixed powder is obtained; a2, the plastic part and the mixed powder are stirred; a3, the plastic part is subjected to color fixing treatment; and A4, the plastic part is dried, and the 3D printing single light response type plastic part is obtained. The invention further provides a method for 3D printing of the composite light response type plastic part. According to the 3D printing single and composite light response type plastic parts obtained through the method, the printed light response type plastic parts can be applied to various fields, and the individual requirements of people are met.

Description

Technical Field

[0001] The present invention belongs to the technical field of 3D printing, and in particular relates to a method and application of 3D printing single and composite light-responsive plastic parts. Background Art

[0002] In recent years, 3D printing technology has been increasingly valued by relevant researchers at home and abroad. In the fields of aerospace, energy, national defense, automobile, biomedicine, etc., core manufacturing technology has achieved breakthroughs and leapfrog development. The key element of 3D printing technology is to add or connect materials layer by layer in the entire product in sequence. The design process of 3D printing is generally to first model through computer modeling software, and then "partition" the built three-dimensional model into layer-by-layer cross-sections, that is, slices, so as to guide the printer to print layer by layer. The advantages of 3D printing are that it can manufacture highly complex geometric parts, a wide range of raw materials, convenient and fast processing, and rapid technological development. Among them, Selective Laser Sintering (SLS) is a powder-based additive manufacturing method. This method uses powdered materials to form, and uses a high-intensity laser to sinter the powder layer by layer to obtain printed parts. The SLS printed parts include hard plastics PA12, PP and flexible plastics TPU, TPA, etc. Flexible 3D printed plastic parts are suitable for elastomer-related consumer products such as sole cushioning, car or bicycle seats, and linings. Hard 3D printed plastic parts are suitable for automotive parts, medical devices and other fields.

[0003] The SLS printing process uses software to slice the three-dimensional model of the part along the Z direction, set the preheating temperature, scanning rate, scanning power, single layer thickness and other process parameters, and then use a powder roller to spread a layer of powder material on the workbench. The laser beam emitted by the laser selectively scans the powder layer under the control of the computer according to the data of each cross section of the geometric shape. In the area scanned by the laser, the powder interface melts and the powders adhere to each other. The part not irradiated by the laser is still loose, serving as a support for the work and the next layer of powder; after one layer is sintered, the workbench drops the height of a cross-section layer, and then the next layer of powder is spread and sintered, and the cycle is repeated to obtain the designed three-dimensional solid parts.

[0004] Fluorescent materials can produce different fluorescence responses under the action of ultraviolet or visible light, and can be applied in various fields and used in combination with various products to meet people's diverse and personalized needs for products. Relevant research progress has shown that 3D printing technology can produce products with fluorescent responses. However, products with fluorescent effects obtained using SLS printing technology are mostly used in high-tech scientific research fields such as biomedicine, and lack application in other fields, such as civilian consumer products, and cannot meet people's diverse and personalized needs. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a method and application of 3D printing single and composite light-responsive plastic parts, with the aim of enabling the printed light-responsive plastic parts to be applied in various fields to meet people's personalized needs.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] A method for 3D printing single and composite light-responsive plastic parts, comprising the following steps:

[0008] Step S1, weighing the printing material as the printing raw material, adjusting the printer to suitable parameters for printing, cleaning the excess powder on the surface of the printed material after printing, and obtaining a plastic part; when the printing material is plastic powder and fluorescent material, they need to be weighed according to the mass ratio, stirred and blended in a mechanical stirrer, and the mixed powder is used as the printing raw material. After printing, a color fixing treatment is performed to obtain a 3D printed single light responsive plastic part; when the printing material is plastic powder, a plastic part is obtained;

[0009] In step S1, after obtaining the plastic part, the following sub-steps are also included:

[0010] Step A1, weighing the printed plastic product, weighing the plastic powder and the fluorescent material according to the weight of the plastic product and the mass ratio, stirring and blending them in a mechanical stirrer to obtain a mixed powder of the plastic powder and the fluorescent material;

[0011] Step A2, stirring the plastic part and the mixed powder of the plastic powder and the fluorescent material by a stirrer to obtain a preliminary 3D printed single light-responsive plastic part;

[0012] Step A3, post-processing the preliminary 3D printed single light-responsive plastic part, selecting an organic good solvent for plastic, and placing the organic good solvent on the surface of the preliminary 3D printed single light-responsive plastic part by spraying or dipping to perform a color fixing treatment;

[0013] Step A4, taking out the preliminary single light-responsive plastic part with the organic solvent, placing it in a blast dryer to fully dry it, removing the organic solvent, and naturally cooling it to room temperature to obtain a 3D printed single light-responsive plastic part.

[0014] Furthermore, in step S1, the printer is a selective laser sintering 3D printer; the method of cleaning the excess powder on the surface of the printed material is to use a sandblasting machine to blast for 2 to 5 minutes; the mass ratio is plastic powder: fluorescent material = 100: (5 to 20); the time of stirring and blending in a mechanical stirrer is 30 to 60 minutes;

[0015] In step A1, the mass ratio is plastic part: plastic powder: fluorescent material = 50: (500-1000): (20-40); the time of stirring and blending in a mechanical stirrer is 15-45 minutes;

[0016] In step A2, the stirring time of the stirrer is 30 to 60 minutes;

[0017] In step A3, the organic good solvent is two or more of ethanol, acetone, chloroform, dichloromethane, hexafluoroisopropanol, dimethylacetamide, N,N-dimethylformamide, and dimethyl sulfoxide;

[0018] In step A4, the conditions for sufficient drying are a drying temperature of 50° C. and a drying time of 12 to 48 hours.

[0019] The present invention also provides a method for 3D printing a composite light-responsive plastic part, which is implemented based on the above-mentioned method for 3D printing a single light-responsive plastic part, and includes the following steps:

[0020] Step B1, treating the above-mentioned 3D printed single light-responsive plastic product with an inorganic or organic fluorescent material so that the treated plastic product has two or more fluorescent responses, and performing a color fixing treatment on the plastic product having two or more fluorescent responses;

[0021] Step B2, taking out the two or more fluorescent responsive plastic parts with organic solvent, placing them in a blast dryer to fully dry, and naturally cooling them to room temperature to obtain a 3D printed composite light-responsive plastic part.

[0022] Furthermore, in step B1, the method for processing the inorganic fluorescent material is to weigh the 3D printed single light-responsive plastic part, weigh the plastic powder and the fluorescent material according to the mass ratio, stir and blend the plastic powder and the fluorescent material in a mechanical stirrer to obtain a mixed powder of the plastic powder and the fluorescent material; stir the 3D printed single light-responsive plastic part and the mixed powder with a stirrer so that the plastic part has two or more fluorescent responses; select an organic good solvent for the plastic, and place the organic good solvent on the surface of the plastic part with two or more fluorescent responses by spraying or dipping for color fixation treatment.

[0023] Furthermore, the inorganic fluorescent material is one of yellow-green luminous powder, blue-green luminous powder, sky blue luminous powder, RYA029, RYAO39, RYPO28, and RYB035-8.

[0024] Furthermore, the mass ratio is 3D printing single light-responsive plastic part: plastic powder: fluorescent material = 50: (500-1000): (20-40); the mechanical agitator stirring blending time is 15-45 minutes; the agitator stirring time is 30-60 minutes; the organic good solvent is two or more of ethanol, acetone, chloroform, dichloromethane, hexafluoroisopropanol, dimethylacetamide, N,N-dimethylformamide, and dimethyl sulfoxide.

[0025] Furthermore, in step B1, the method for processing the organic fluorescent material is to select an organic good solvent for plastic, mix the organic fluorescent material and the organic good solvent in proportion to obtain a fluorescent solvent mixture; the fluorescent solvent mixture is placed on the surface of a 3D-printed single light-responsive plastic part by spraying or dipping, and the organic fluorescent material in the fluorescent solvent mixture penetrates into the 3D-printed single light-responsive plastic part, so that the plastic part has two or more fluorescent responses; the organic good solvent in the fluorescent solvent mixture realizes a color fixation treatment of the plastic part having two or more fluorescent responses.

[0026] Furthermore, the organic fluorescent material is one of hydroxymethyl coumarin, Brilliant Ultra Violet 395, Brilliant Ultra Violet 661, and Brilliant Ultra Violet 563; the organic good solvent is two or more of ethanol, acetone, chloroform, dichloromethane, hexafluoroisopropanol, dimethylacetamide, N,N-dimethylformamide, and dimethyl sulfoxide; and the ratio is organic fluorescent material: organic good solvent = (1-10):100.

[0027] Furthermore, in step B2, the conditions for sufficient drying are a drying temperature of 50° C. and a drying time of 12 to 48 hours.

[0028] The present invention also provides an application of 3D printed single and composite light-responsive plastic parts, and the 3D printed single and composite light-responsive plastic parts are prepared by the above-mentioned method of 3D printing a single light-responsive plastic part and the method of 3D printing a composite light-responsive plastic part; the 3D printed single and composite light-responsive plastic parts are applied to one or more of the fields of biomedicine, building construction, aerospace, road traffic, anti-counterfeiting labels, special textiles, and consumer goods.

[0029] Beneficial Effects

[0030] 1. Using the method of 3D printing single and composite light-responsive plastic parts of the present invention, the light-responsive plastic parts after printing can be applied to various fields to meet people's personalized needs;

[0031] 2. The 3D printed single light-responsive plastic parts of the present invention can show good fluorescence response, more stable and lasting fluorescence performance, convenient processing, and are widely used in the fields of life medicine, aerospace, civilian consumer products, etc.;

[0032] 3. The 3D printed composite light-responsive plastic product of the present invention can achieve two or more fluorescence responses, provide more personalized options, and is suitable for more complex situations. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A block diagram of a method for 3D printing a single light-responsive plastic part;

[0034] Figure 2 A block diagram of a method for 3D printing composite light-responsive plastic parts;

[0035] Figure 3 This is a picture of hydroxymethylcoumarin under an optical microscope;

[0036] Figure 4 This is a picture of a thermoplastic polyurethane elastomer (TPU) product under 365nm ultraviolet light;

[0037] Figure 5 This is a picture of a 3D printed single light-responsive thermoplastic polyurethane elastomer (TPU) part under 365nm ultraviolet light;

[0038] Figure 6 This is a picture of blue-green luminous powder under an optical microscope;

[0039] Figure 7 This is a picture of a single photoresponsive polyamide (PA) 3D printed part in a dark environment;

[0040] Figure 8 This is a picture of the fluorescent material Brilliant Ultra Violet 395 in a mixed solution of dimethyl sulfoxide and ethanol in a dark environment;

[0041] Fig. 9 This is a picture of a 3D printed composite light-responsive polyamide part in a dark environment;

[0042] Fig.10 This is a picture of a 3D printed composite light-responsive polyamide part under UV light;

[0043] Fig.11 This is a picture of a 3D printed composite light-responsive thermoplastic polyurethane elastomer component in a dark environment;

[0044] Fig.12This is a picture of a 3D printed composite light-responsive thermoplastic polyurethane elastomer component under 365nm ultraviolet light. DETAILED DESCRIPTION

[0045] The present invention is further illustrated by specific examples below. These examples are exemplary and are intended to illustrate the problem and explain the present invention, but are not intended to be limiting.

[0046] Example 1

[0047] A method for 3D printing a single light-responsive plastic part comprises the following steps:

[0048] Step S1, weighing the plastic powder and the fluorescent material according to the mass ratio, stirring and blending in a mechanical stirrer to obtain a mixed powder of the plastic powder and the fluorescent material;

[0049] Step S2, the obtained mixed powder is used as a printing material, and the printer is adjusted to appropriate parameters for printing. After printing is completed, the excess powder on the surface of the printed material is cleaned and a color fixing treatment is performed to obtain a 3D printed single light-responsive plastic part.

[0050] The 3D printed single light-responsive plastic part obtained by this embodiment has a fluorescent response in the overall internal and external structure. When the fluorescent material is an organic fluorescent material, the organic fluorescent material and the plastic high molecular polymer will react to form a covalent bond under the high temperature environment of the printing process to make the fluorescent performance more stable and durable. The obtained 3D printed single light-responsive plastic part is suitable for fields with higher service life requirements, such as biomedicine, building construction, aerospace, road traffic, anti-counterfeiting labels, and special textile fields. When the fluorescent material is an inorganic fluorescent material, there is no chemical reaction during the printing process of the inorganic fluorescent material and the plastic high molecular polymer blend, and the inorganic fluorescent material exists in the form of filling in the gap inside the printed part. The obtained 3D printed single light-responsive plastic part shows a good fluorescent response in a dark environment, and has better universality and cost-effectiveness in the field of consumer goods.

[0051] Example 2

[0052] A method for 3D printing a single light-responsive thermoplastic polyurethane elastomer component comprises the following steps:

[0053] Step S1, placing thermoplastic polyurethane elastomer (TPU) powder and hydroxymethyl coumarin powder in a mechanical stirrer at a mass ratio of 100:5 and stirring and blending for 30 minutes to obtain a mixed powder of hydroxymethyl coumarin and thermoplastic polyurethane elastomer (TPU);

[0054] Step S2, taking a mixed powder of hydroxymethyl coumarin and thermoplastic polyurethane elastomer (TPU) as a raw material for selective laser sintering printing, adjusting the selective laser sintering printer to appropriate parameters for printing, during the sintering process, hydroxymethyl coumarin and thermoplastic polyurethane elastomer (TPU) chemically react, so that a chromophore with a fluorescent effect is introduced into the thermoplastic polyurethane elastomer (TPU), and after printing is completed, the excess powder on the surface of the printed material is cleaned to obtain a 3D printed single light-responsive thermoplastic polyurethane elastomer component.

[0055] Fluorescence response analysis of 3D printed single photoresponsive thermoplastic polyurethane elastomer parts

[0056] Figure 3 This is a picture of hydroxymethylcoumarin under an optical microscope; Figure 4 This is a picture of a thermoplastic polyurethane elastomer (TPU) product under 365nm ultraviolet light; Figure 5 This is a picture of a 3D printed single light-responsive thermoplastic polyurethane elastomer (TPU) part under 365nm ultraviolet light.

[0057] By using the method of this embodiment, hydroxymethyl coumarin is introduced into a thermoplastic polyurethane elastomer (TPU) product, and the obtained 3D printed single light-responsive thermoplastic polyurethane elastomer (TPU) product has a single light response and exhibits blue-purple fluorescence under 365nm ultraviolet light.

[0058] Example 3

[0059] A method for 3D printing a single light-responsive plastic part comprises the following steps:

[0060] Step S1, using plastic powder as a printing material, adjusting the printer to appropriate parameters for printing, and cleaning the excess powder on the surface of the printed material after printing is completed to obtain a plastic part;

[0061] Step S2, weighing the printed plastic part, weighing the plastic powder and the fluorescent material according to the weight of the plastic part and the mass ratio, stirring and blending them in a mechanical stirrer to obtain a mixed powder of the plastic powder and the fluorescent material;

[0062] Step S3, stirring the plastic part and the mixed powder by a stirrer to obtain a preliminary 3D printed single light-responsive plastic part;

[0063] Step S4, post-processing the obtained preliminary 3D printed single light-responsive plastic product, selecting an organic good solvent for plastic, and placing the organic good solvent on the surface of the preliminary 3D printed single light-responsive plastic product by spraying or dipping, and performing a color fixing treatment;

[0064] Step S5, taking out the preliminary single light-responsive plastic part with the organic solvent, placing it in a blast dryer to fully dry it, removing the organic solvent, and naturally cooling it to room temperature to obtain a 3D printed single light-responsive plastic part.

[0065] The mixed powder of plastic powder and fluorescent material used in this embodiment can be recycled, and the printing method saves materials, reduces costs, is environmentally friendly and efficient, and is easy to process. The 3D printed single light-responsive plastic parts obtained by this embodiment are suitable for civilian consumer products, such as protective helmets, protective gloves, etc. For example, in today's popular cycling sports, some cycling enthusiasts like to form a team for night riding. Unique 3D printed parts with fluorescent response can be customized on the outside of the cycling helmet and the back of the gloves according to the characteristics of the team. When riding at night, the distance between the cycling enthusiasts can be controlled to prevent falling. In most outdoor sports, the monitoring of ultraviolet rays is also very critical. Fluorescent wearable products with ultraviolet response can provide real-time feedback of the current ultraviolet intensity according to the color during exercise.

[0066] Example 4

[0067] A method for 3D printing a single light-responsive polyamide part comprises the following steps:

[0068] Step S1, using polyamide (PA) powder as a printing material, adjusting the selective laser sintering printer to appropriate parameters for printing, and cleaning the excess powder on the surface of the printed material after printing is completed to obtain a polyamide (PA) product;

[0069] Step S2, weighing the obtained polyamide (PA) product to determine that the mass is 50g, taking 1000g of polyamide (PA) powder and 20g of blue-green luminous powder, stirring and blending the polyamide (PA) powder and the blue-green luminous powder in a mechanical stirrer for 30 minutes to obtain a mixed powder of polyamide (PA) powder and blue-green luminous powder;

[0070] Step S3, mixing the mixed powder of polyamide (PA) powder and blue-green luminous powder with the polyamide (PA) product by a stirrer, and tumbling for 60 minutes, so that the mixed powder is wrapped and enters the pores of the polyamide (PA) product by mechanical action, and the polyamide (PA) has a fluorescent response through physical adsorption and weak chemical bond between the powders, and the polyamide (PA) product is taken out, and the floating powder on the surface is shaken off for standby use;

[0071] Step S4, selecting dimethyl sulfoxide (DMSO) and ethanol, which are good organic solvents for polyamide (PA), and mixing the dimethyl sulfoxide (DMSO) and ethanol at a ratio of 5:1 at room temperature to obtain an organic solvent mixed solution for color fixation, and soaking the polyamide (PA) product in the mixed solution of dimethyl sulfoxide (DMSO) and ethanol for 1 minute, so that the micropores on the surface of the polyamide (PA) product are sealed and smoothed, and the blue-green luminous powder in the micropores is further fixed;

[0072] Step S5, take out the polyamide (PA) product treated with organic solvent, drain it, put it into a blast dryer, adjust the temperature to 50°C, and dry it for 24 hours to remove the residual solvent. Take it out and cool it naturally to room temperature to obtain a 3D printed single light responsive polyamide (PA) product.

[0073] Fluorescence response analysis of 3D printed single light-responsive polyamide parts

[0074] Figure 6 This is a picture of blue-green luminous powder under an optical microscope; Figure 7 This is a picture of a single photoresponsive polyamide (PA) 3D printed part in a dark environment.

[0075] By using the method of this embodiment, the blue-green luminous powder is introduced into the polyamide (PA) product, and the obtained 3D printed single light response polyamide (PA) product has a single light response and exhibits blue-green fluorescence in a dark environment.

[0076] Surface roughness analysis of polyamide parts and 3D printed single light-responsive polyamide parts

[0077] At the same time, the surface roughness of the printed polyamide (PA) parts and the 3D printed single light-responsive polyamide (PA) parts were measured. The surface roughness data are summarized in Table 1. It is found that the surface roughness of the 3D printed single light-responsive polyamide (PA) parts is small. This is because the polyamide (PA) parts are subjected to a color fixing treatment. The organic solvent mixture used for color fixing makes the surface micropores of the 3D printed single light-responsive polyamide (PA) parts closed and smoothed, so the surface roughness of the 3D printed single light-responsive polyamide (PA) parts is smaller.

[0078] Table 1 Surface roughness of PA parts and 3D printed single photoresponsive PA parts

[0079]

[0080] Example 5

[0081] A method for 3D printing a composite light-responsive plastic part comprises the following steps:

[0082] Step S1, weighing the plastic powder and the fluorescent material according to the mass ratio, stirring and blending in a mechanical stirrer to obtain a mixed powder of the plastic powder and the fluorescent material;

[0083] Step S2, the obtained mixed powder is used as a printing material, the printer is adjusted to appropriate parameters for printing, and after printing is completed, the excess powder on the surface of the printed material is cleaned and a color fixing treatment is performed to obtain a 3D printed single light-responsive plastic part;

[0084] Step S3, treating the above-mentioned 3D printed single light-responsive plastic product with an inorganic or organic fluorescent material so that the treated plastic product has two or more fluorescent responses, and performing a color fixing treatment on the plastic product having two or more fluorescent responses;

[0085] Step S4, taking out the two or more fluorescent responsive plastic parts with organic solvent, placing them in a blast dryer to fully dry, and naturally cooling them to room temperature to obtain a 3D printed composite light-responsive plastic part.

[0086] The 3D printed composite light-responsive plastic parts obtained by this embodiment can realize two or more fluorescent responses, provide more personalized options, and are suitable for more complex situations. By designing materials and processing methods to achieve a variety of complex responses, such as special clothing, anti-counterfeiting labels, etc. Clothing products can combine fluorescent 3D printed plastic parts with clothing as accessories, accessories or brand logos to achieve personalized needs such as anti-counterfeiting and color change. It can also be used as a warning rescue sign, which can provide different light signal feedback for rescue during the day or at night. When conducting outdoor or outdoor activities, customized plastics and luminous materials with good durability can be used as guide signs and road signs for long-term use. It can also be used in anti-counterfeiting products, such as high-end luxury goods and other valuable products or other products that are easily imitated. Printing composite light-responsive parts or components can play a preventive role against imitations, allowing consumers to more intuitively distinguish the authenticity of products.

[0087] Example 6

[0088] A method for 3D printing a composite light-responsive polyamide product comprises the following steps:

[0089] Step S1, placing polyamide (PA) powder and yellow-green luminous powder in a mechanical stirrer at a mass ratio of 100:5 and stirring and blending for 30 minutes to obtain a mixed powder of yellow-green luminous powder and polyamide (PA);

[0090] Step S2, the yellow-green luminous powder and the polyamide (PA) mixed powder are used as raw materials for selective laser sintering printing, and the selective laser sintering printer is adjusted to appropriate parameters for printing. During the sintering process, the yellow-green luminous powder is present in the gap inside the polyamide (PA) workpiece in the form of filling. After the printing is completed, the excess powder on the surface of the printed material is cleaned to obtain a polyamide (PA) workpiece with a fluorescent response;

[0091] Step S3, selecting dimethyl sulfoxide (DMSO) and ethanol, which are good organic solvents for polyamide (PA), and mixing the dimethyl sulfoxide (DMSO) and ethanol at a mass ratio of 5:1 at room temperature to obtain an organic solvent mixed solution for color fixation, and mixing the polymer fluorescent material Brilliant Ultra Violet 395 with the organic solvent mixed solution at a mass ratio of 3:100, and fully stirring and dissolving them to obtain a fluorescent organic mixed solution;

[0092] Step S4, placing the polyamide (PA) workpiece in the fluorescent organic mixed solution and soaking it for 60 seconds, introducing the fluorescent material Brilliant Ultra Violet 395 directly into the surface and microporous structure of the polyamide (PA) workpiece by immersion, allowing the fluorescent material Brilliant Ultra Violet 395 to enter and cover the printed polyamide (PA) workpiece by physical adsorption, so that it has a fluorescent response, and slightly dissolving the surface of the polyamide (PA) workpiece by the dissolving action of the organic solvent to close the surface pores of the polyamide (PA) workpiece, thereby completing the color fixing process;

[0093] Step S5, take out the polyamide (PA) product treated with the organic solvent, drain it, and put it into a blast dryer, adjust the temperature to 50°C, and dry it for 24 hours. Dry it thoroughly to remove the residual solvent, take it out and cool it naturally to room temperature to obtain a 3D printed composite light-responsive polyamide (PA) product.

[0094] Fluorescence response analysis of 3D printed composite light-responsive polyamide parts

[0095] Figure 8 This is a picture of the fluorescent material Brilliant Ultra Violet 395 in a mixed solution of dimethyl sulfoxide and ethanol in a dark environment; Fig. 9 This is a picture of a 3D printed composite light-responsive polyamide part in a dark environment; Fig.10 This is a picture of a 3D printed composite light-responsive polyamide part under ultraviolet light.

[0096] By using the method of this embodiment, the yellow-green luminous powder and the polymer fluorescent material Brilliant UltraViolet 395 are introduced into the polyamide (PA) product, and the obtained 3D printed composite light-responsive polyamide (PA) product has two light responses, showing yellow-green fluorescence in a dark environment and purple fluorescence under ultraviolet light.

[0097] Example 7

[0098] A method for 3D printing a composite light-responsive thermoplastic polyurethane elastomer component comprises the following steps:

[0099] Step S1, placing thermoplastic polyurethane elastomer (TPU) powder and hydroxymethyl coumarin powder in a mechanical stirrer at a mass ratio of 100:3 and stirring and blending for 30 minutes to obtain a mixed powder of hydroxymethyl coumarin and thermoplastic polyurethane elastomer (TPU);

[0100] Step S2, using the mixed powder of hydroxymethyl coumarin and thermoplastic polyurethane elastomer (TPU) as a raw material for selective laser sintering printing, adjusting the selective laser sintering printer to appropriate parameters for printing, during the sintering process, the hydroxymethyl coumarin and the thermoplastic polyurethane elastomer (TPU) undergo a chemical reaction, so that a chromophore with a fluorescent effect is introduced into the thermoplastic polyurethane elastomer (TPU), and after printing is completed, the excess powder on the surface of the printed material is cleaned to obtain a thermoplastic polyurethane elastomer (TPU) product with a fluorescent response;

[0101] Step S3, mixing a thermoplastic polyurethane elastomer (TPU) product with fluorescence response, thermoplastic polyurethane elastomer (TPU) powder, and blue-green luminous powder in a mass ratio of 1:200:3, stirring and blending the mixed thermoplastic polyurethane elastomer (TPU) powder and blue-green luminous powder in a mechanical stirrer for 30 minutes to obtain a mixed powder of thermoplastic polyurethane elastomer (TPU) powder and blue-green luminous powder;

[0102] Step S4, the obtained mixed powder of thermoplastic polyurethane elastomer (TPU) powder and blue-green luminous powder and the thermoplastic polyurethane elastomer (TPU) product are stirred by a stirrer, and the stirring and rolling are performed for 60 minutes, so that the mixed powder is wrapped and enters the pores of the thermoplastic polyurethane elastomer (TPU) product through mechanical action, and the mixed powder has a fluorescent response through physical adsorption and weak chemical bond binding, and the thermoplastic polyurethane elastomer (TPU) product is taken out, and the floating powder on the surface is shaken off for standby use;

[0103] Step S5, selecting dimethylacetamide (DMA) and ethanol, which are good organic solvents for thermoplastic polyurethane elastomer (TPU), and mixing dimethylacetamide (DMA) and ethanol at a ratio of 5:1 at room temperature to obtain an organic solvent mixed solution for color fixation, and soaking the thermoplastic polyurethane elastomer (TPU) product in the mixed solution of dimethylacetamide (DMA) and ethanol for 1 minute, so that the micropores on the surface of the thermoplastic polyurethane elastomer (TPU) product are closed and smoothed, and the blue-green luminous powder in the micropores is further fixed;

[0104] Step S6, take out the thermoplastic polyurethane elastomer (TPU) product treated with organic solvent, drain it, and put it into a blower dryer, adjust the temperature to 50°C, and dry it for 24 hours. Dry it thoroughly to remove the residual solvent, take it out and cool it naturally to room temperature to obtain a 3D printed composite light-responsive thermoplastic polyurethane elastomer (TPU) product.

[0105] Fluorescence response analysis of 3D printed composite light-responsive thermoplastic polyurethane elastomer parts

[0106] Fig.11 This is a picture of a 3D printed composite light-responsive thermoplastic polyurethane elastomer component in a dark environment; Fig.12 This is a picture of a 3D printed composite light-responsive thermoplastic polyurethane elastomer component under 365nm ultraviolet light.

[0107] By using the method of this embodiment, hydroxymethyl coumarin and blue-green luminous powder are introduced into a thermoplastic polyurethane elastomer (TPU) product, and the obtained 3D printed composite light-responsive thermoplastic polyurethane elastomer (TPU) product has two light responses, showing blue-green fluorescence in a dark environment and blue-purple fluorescence under 365nm ultraviolet light.

Claims

1. A method for 3D printing a single light-responsive plastic part, characterized in that: The steps include: Step S1, weighing the printing material as the printing raw material, adjusting the printer to suitable parameters for printing, and cleaning the excess powder on the surface of the printed material after printing to obtain a plastic part; when the printing material is plastic powder and fluorescent material, they need to be weighed according to the mass ratio, stirred and blended in a mechanical stirrer, and the mixed powder is used as the printing raw material. After printing, a color fixing treatment is performed to obtain a 3D printed single light responsive plastic part; when the printing material is plastic powder, a plastic part is obtained; In the step S1, after obtaining the plastic part, the following sub-steps are also included: Step A1, weighing the printed plastic product, weighing the plastic powder and the fluorescent material according to the weight of the plastic product and the mass ratio, stirring and blending them in a mechanical stirrer to obtain a mixed powder of the plastic powder and the fluorescent material; Step A2, stirring the plastic part and the mixed powder of the plastic powder and the fluorescent material by a stirrer to obtain a preliminary 3D printed single light-responsive plastic part; Step A3, post-processing the preliminary 3D printed single light-responsive plastic part, selecting an organic good solvent for plastic, and placing the organic good solvent on the surface of the preliminary 3D printed single light-responsive plastic part by spraying or dipping to perform a color fixing treatment; Step A4, taking out the preliminary single light-responsive plastic part with the organic solvent, placing it in a blast dryer to fully dry it, removing the organic solvent, and naturally cooling it to room temperature to obtain a 3D printed single light-responsive plastic part.

2. The method for 3D printing a single light-responsive plastic part according to claim 1, characterized in that: In step S1, the printer is a selective laser sintering 3D printer; the method of cleaning the excess powder on the surface of the printed material is to use a sandblasting machine to blast for 2 to 5 minutes; the mass ratio is plastic powder: fluorescent material = 100: (5 to 20); the time of stirring and blending in a mechanical stirrer is 30 to 60 minutes; In step A1, the mass ratio is plastic part: plastic powder: fluorescent material = 50: (500-1000): (20-40); the time of stirring and blending in the mechanical stirrer is 15-45 minutes; In step A2, the stirring time of the stirrer is 30 to 60 minutes; In step A3, the organic good solvent is two or more of ethanol, acetone, chloroform, dichloromethane, hexafluoroisopropanol, dimethylacetamide, N,N-dimethylformamide, and dimethyl sulfoxide; In step A4, the conditions for sufficient drying are a drying temperature of 50° C. and a drying time of 12 to 48 hours.

3. A method for 3D printing a composite light-responsive plastic part, implemented based on the method for 3D printing a single light-responsive plastic part according to any one of claims 1-2, characterized in that: The steps include: Step B1, treating the 3D printed single light-responsive plastic part with an inorganic or organic fluorescent material so that the treated plastic part has two or more fluorescent responses, and performing a color fixing treatment on the plastic part having two or more fluorescent responses; Step B2, taking out the two or more fluorescent responsive plastic parts with organic solvent, placing them in a blast dryer to fully dry, and naturally cooling them to room temperature to obtain a 3D printed composite light-responsive plastic part.

4. The method for 3D printing a composite light-responsive plastic part according to claim 3, characterized in that: In step B1, the method for processing the inorganic fluorescent material is to weigh the 3D printed single light-responsive plastic part, weigh the plastic powder and the fluorescent material according to the mass ratio, stir and blend the plastic powder and the fluorescent material in a mechanical stirrer to obtain a mixed powder of plastic powder and fluorescent material; stir the 3D printed single light-responsive plastic part and the mixed powder with a stirrer so that the plastic part has two or more fluorescent responses; select an organic good solvent for the plastic, and place the organic good solvent on the surface of the plastic part with two or more fluorescent responses by spraying or dipping for color fixation.

5. The method for 3D printing a composite light-responsive plastic part according to claim 4, characterized in that: The inorganic fluorescent material is one of yellow-green luminous powder, blue-green luminous powder, sky-blue luminous powder, RYA029, RYAO39, RYPO28, and RYB035-8.

6. The method for 3D printing a composite light-responsive plastic part according to claim 4, characterized in that: The mass ratio is 3D printing single light-responsive plastic part: plastic powder: fluorescent material = 50: (500~1000): (20~40); the mechanical agitator stirs and blends for 15~45 minutes; the agitator stirs for 30~60 minutes; the organic good solvent is two or more of ethanol, acetone, chloroform, dichloromethane, hexafluoroisopropanol, dimethylacetamide, N,N-dimethylformamide, and dimethyl sulfoxide.

7. The method for 3D printing a composite light-responsive plastic part according to claim 3, characterized in that: In step B1, the method for processing the organic fluorescent material is to select an organic good solvent for plastic, mix the organic fluorescent material and the organic good solvent in proportion to obtain a fluorescent solvent mixture; the fluorescent solvent mixture is placed on the surface of the 3D printed single light responsive plastic part by spraying or dipping, and the organic fluorescent material in the fluorescent solvent mixture penetrates into the 3D printed single light responsive plastic part, so that the plastic part has two or more fluorescent responses; the organic good solvent in the fluorescent solvent mixture realizes the color fixation treatment of the plastic part with two or more fluorescent responses.

8. The method for 3D printing a composite light-responsive plastic part according to claim 7, characterized in that: The organic fluorescent material is one of hydroxymethyl coumarin, Brilliant Ultra Violet 395, Brilliant Ultra Violet 661, and Brilliant Ultra Violet 563; the organic good solvent is two or more of ethanol, acetone, chloroform, dichloromethane, hexafluoroisopropanol, dimethylacetamide, N,N-dimethylformamide, and dimethyl sulfoxide; and the ratio is organic fluorescent material: organic good solvent = (1-10):

100.

9. The method for 3D printing a composite light-responsive plastic part according to claim 3, characterized in that: In step B2, the sufficient drying conditions are a drying temperature of 50° C. and a drying time of 12 to 48 hours.

10. An application of a 3D light-responsive plastic part, characterized in that: The photoresponsive plastic product is prepared by the method described in any one of claims 1 to 9; the photoresponsive plastic product is applied to one or more of the fields of biomedicine, building construction, aerospace, road traffic, anti-counterfeiting labels, special textiles, and consumer goods.

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