A nylon 6 in-situ colored slice and preparation method thereof

Abstract

The invention relates to the technical field of chemical material preparation and processing, and discloses a nylon 6 in-situ colored slice and a preparation method thereof, comprising the following steps: adding carbon black, a reaction aid, a pH aid, and a coupling agent to deionized water in a certain proportion, grinding the carbon black with a grinding device to obtain a self-dispersing carbon black slurry; mixing the prepared self-dispersing carbon black slurry with a polyamide precursor caprolactam monomer according to a carbon black and caprolactam mass percentage of 0.1 to 50%, using a polymerization process to in-situ polymerize and color nylon 6, and then through a belt casting and pelletizing process to obtain a nylon 6 in-situ colored slice. This scheme has the beneficial effect of re-adsorbing the raw material extruded from the grinding area during the grinding process and putting it into the grinding area for re-grinding, solving the problem that the raw material extruded outside the grinding disc is not fully ground, which will cause its particle size to be too large and not suitable for preparing nylon 6 in-situ colored slices.

Description

Technical Field

[0001] The invention relates to the technical field of chemical material preparation and processing, in particular to a nylon 6 in-situ colored slice and a preparation method thereof. Background Art

[0002] Nylon 6 in-situ coloring chips are a special type of nylon 6 chips. The preparation process involves adjusting the original color of nylon 6, that is, coloring is achieved while producing nylon 6 chips. Nylon 6 in-situ coloring chips are a polymer compound that achieves color adjustment by adding pigments or colorants during the preparation of nylon 6 through a specific process. It is a special form of polyamide 6 (PA6) and has the basic properties of nylon 6 and the characteristics of adjustable color.

[0003] By adding different pigments or colorants, nylon 6 chips of various colors can be prepared to meet different application requirements. Since the pigments or colorants are added during the polymerization process, the color is more closely combined with the nylon 6 molecular chain and is not easy to fade or change color.

[0004] The preparation of nylon 6 in-situ colored slices usually requires grinding of carbon black raw materials. However, the existing grinding device usually consists of a shell and a grinding disc. When the grinding disc grinds the carbon black raw materials, part of the raw materials will be squeezed out of the grinding disc. The carbon black raw materials squeezed out of the grinding disc are not fully ground, which will cause the particle size to be too large and is not suitable for the preparation of nylon 6 in-situ colored slices. Therefore, it does not meet the existing needs. In this regard, we propose a nylon 6 in-situ colored slice and a preparation method thereof. Summary of the invention

[0005] The present invention provides a nylon 6 in-situ colored slice and a preparation method thereof, which has the beneficial effect of re-adsorbing the raw material squeezed out of the grinding area and putting it into the grinding area for re-grinding during the grinding process, and solves the problem mentioned in the above background technology that the raw material squeezed out of the grinding disc is not fully ground, resulting in excessive particle size and being unsuitable for preparing nylon 6 in-situ colored slices.

[0006] The present invention provides the following technical solution: a method for preparing nylon 6 in-situ colored slices, comprising the following steps:

[0007] S1. Add 2 to 40 parts of carbon black, 10 to 50 parts of reaction aid, 0.2 to 2.0 parts of pH aid, and 0.1 to 1.0 parts of coupling agent to 20 to 80 parts of deionized water by weight, and treat the carbon black with a grinding device to obtain a self-dispersible carbon black slurry with a particle size of 30 to 180 nanometers;

[0008] The reaction aid comprises:

[0009] a. Sodium nitrite, ammonium nitrite, magnesium nitrite or calcium nitrite;

[0010] b. Diazonium salt precursor;

[0011] The pH auxiliary agent includes one or more of hydrochloric acid, hydrobromic acid, sulfuric acid, phosphoric acid, nitric acid, oxalic acid, sodium hydroxide, potassium hydroxide, ethylamine, and diethylamine;

[0012] The coupling agent is a hyperbranched polyester with a polyhydroxyl and dendrite structure, the terminal group is a water-soluble group molecule, and the weight average molecular weight is 500 to 20,000;

[0013] The grinding device includes a grinding shell, in which a grinding disc for grinding raw materials is arranged, a connecting shaft is fixedly connected to the grinding disc, one end of the connecting shaft is fixedly connected to a driving motor, and a side wall of the connecting shaft is provided with an adsorption power device, and the adsorption power device is connected to a suction device for adsorbing raw materials located outside the grinding disc through a connecting component.

[0014] The material suction device comprises an aggregate scraper block fixedly connected to the grinding disc, a material suction head is arranged in the aggregate scraper block, one side of the material suction head is connected to a No. 1 hose, and the other end of the No. 1 hose is provided with the connecting component.

[0015] S2. Mix the prepared self-dispersible carbon black slurry with polyamide precursor caprolactam monomer according to the mass percentage of carbon black and caprolactam of 0.1-50%, adopt polymerization process to in-situ polymerization and color nylon 6, and then carry out strip casting and pelletizing process to obtain nylon 6 in-situ colored slices.

[0016] As an optional scheme of the method for preparing a nylon 6 in-situ colored slice described in the present invention, the carbon black is one or more of acidic carbon black, neutral carbon black, and alkaline carbon black.

[0017] As an optional scheme of the method for preparing nylon 6 in-situ colored slices described in the present invention, it includes a grinding device, wherein: the adsorption power device includes a suction bin fixedly connected to the side wall of the connecting shaft, a piston plate is slidably connected in the suction bin, a No. 1 track groove is provided at one end of the piston plate, the No. 1 track groove is opened in the driving block, and the driving block is fixedly connected to the grinding shell.

[0018] As an optional solution of the method for preparing nylon 6 in-situ colored slices described in the present invention, the driving motor is installed on a mounting frame, and the mounting frame is fixedly connected to the driving block.

[0019] As an optional scheme for the method for preparing nylon 6 in-situ colored slices described in the present invention, a rotating groove is opened at the bottom of the piston plate, a lifting rod is rotatably connected in the rotating groove, the lifting rod passes through a hollow baffle, the hollow baffle is fixedly connected to the inner wall of the suction bin, a No. 2 spring is fixedly connected to the bottom of the piston plate, and the other end of the No. 2 spring is fixedly connected to the hollow baffle.

[0020] As an optional scheme for the preparation method of nylon 6 in-situ colored slices described in the present invention, wherein: the connecting component includes a suction folded pipe connected to the suction bin, the other end of the suction folded pipe is connected to a No. 1 hose, a No. 1 one-way valve is installed in the suction folded pipe, the bottom of the suction bin is connected to a discharge pipe, the discharge pipe is connected to a discharge hose, a No. 2 one-way valve is installed in the discharge pipe, and a resistance rod fixedly connected to the bottom of the lifting rod is provided in the discharge pipe, and the resistance rod is used to control the opening and closing of the No. 2 one-way valve.

[0021] As an optional scheme for the method for preparing nylon 6 in-situ colored slices described in the present invention, a feed component is provided in the grinding disc, and the feed component includes a return channel and a feed channel opened in the grinding disc, the return channel is connected to the discharge hose, the feed channel is connected to the feed hose, the other end of the feed hose is fixedly connected to the connecting hole plate, the connecting hole plate is fixedly connected to the side wall of the connecting shaft, and a feed straight pipe is fixedly connected to the connecting hole plate.

[0022] As an optional scheme of the method for preparing nylon 6 in-situ colored slices described in the present invention, a stirring device is arranged in the lifting rod, and the stirring device includes a spiral groove opened in the lifting rod, a slider is slidably connected in the spiral groove, the slider is fixedly connected in the hollow baffle, and a stirring rod is fixedly connected to the side wall of the lifting rod.

[0023] As an optional scheme for the preparation method of nylon 6 in-situ colored slices described in the present invention, wherein: a slide groove is opened in the aggregate scraper block, the suction head is slidably connected in the slide groove, one side of the suction head is fixedly connected to a No. 1 spring, the other end of the No. 1 spring is fixedly connected in the aggregate scraper block, the suction head is fixedly connected to a sliding shaft rod on the side away from the No. 1 spring, the other end of the sliding shaft rod is slidably connected in the No. 2 track groove, and the No. 2 track groove is opened on the inner wall of the grinding shell.

[0024] The invention also discloses a nylon 6 in-situ colored slice, wherein: the nylon 6 in-situ colored slice is prepared according to the preparation method of the nylon 6 in-situ colored slice.

[0025] The present invention has the following beneficial effects:

[0026] 1. The nylon 6 in-situ colored slice and preparation method thereof, through the rotation of the grinding disc and the connecting shaft, drives the piston plate to do piston movement in the suction bin, so that negative pressure is continuously generated in the suction bin, and the negative pressure is continuously used to suck the raw materials squeezed out of the grinding area collected by the collection scraper block through the suction folding pipe and the No. 1 hose, and re-transport it to the grinding area through the discharge pipe and the discharge hose for re-grinding. Through this design, the raw materials that are not fully ground can be re-transported to the grinding area for re-grinding, which ensures that the raw materials are fully ground to obtain raw material particles with a suitable particle size, and ensures the stability of the preparation of nylon 6 in-situ colored slices.

[0027] 2. The nylon 6 in-situ colored slice and preparation method thereof, when the piston plate makes piston movement, drives the lifting rod to move synchronously, and under the drive of the spiral groove and the slider, the lifting rod is rotated, and then the stirring rod is driven to rotate. Through the rotation and stirring of the stirring rod, the accumulated raw materials can be effectively broken up, effectively preventing the raw materials from accumulating in the suction bin, and at the same time preventing the raw materials from clogging the discharge pipe, resulting in the inability to transport the raw materials to the grinding area.

[0028] 3. The nylon 6 in-situ colored slice and preparation method thereof are characterized in that a sliding shaft rod is fixedly connected to one side of a suction head and a No. 1 spring is installed on the other side, so that one end of the sliding shaft rod always contacts the No. 2 track groove. The No. 2 track groove with a concave-convex design and the No. 1 spring always drive the sliding shaft rod to contact the No. 2 track groove. When the grinding disc rotates, the No. 2 track groove and the No. 1 spring will continuously drive the suction head to slide left and right in the slide groove. Through this sliding, the suction range of the suction head is larger, which further improves the suction effect of the extruded raw materials and improves the efficiency of the raw material recovery and circulation grinding. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the present invention.

[0030] Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention.

[0031] Figure 3 For the present invention Figure 2 Enlarged structural diagram at A in the middle.

[0032] Figure 4 It is a schematic diagram of the structure of the No. 1 track groove of the present invention.

[0033] Figure 5 For the present invention Figure 3 Enlarged structural diagram at point C in the middle.

[0034] Figure 6 For the present invention Figure 3 Enlarged structural diagram at point D in the middle.

[0035] Figure 7 For the present invention Figure 2 Schematic diagram of the structure at point B in the middle.

[0036] Figure 8 It is a schematic structural diagram of the suction device of the present invention.

[0037] Fig. 9 It is a schematic diagram of the structure of the No. 2 track groove of the present invention.

[0038] In the figure: 1. grinding device; 101. grinding shell; 102. grinding disc; 103. connecting shaft; 104. driving motor; 105. mounting frame; 2. suction device; 201. material collection scraper; 202. slideway; 203. suction head; 204. spring No. 1; 205. hose No. 1; 206. sliding shaft; 207. track groove No. 2; 3. adsorption power device; 301. suction bin; 302. piston plate; 303. rotating groove; 304. lifting rod; 305. hollow baffle; 306, spring No. 2; 307, drive block; 308, track groove No. 1; 4, feed component; 401, return channel; 402, feed channel; 403, feed hose; 404, connecting orifice plate; 405, feed straight pipe; 5, connecting component; 501, suction folding pipe; 502, one-way valve No. 1; 503, discharge pipe; 504, discharge hose; 505, one-way valve No. 2; 506, resistance rod; 6, stirring device; 601, spiral groove; 602, slider; 603, stirring rod. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] Example 1: This example is intended to help solve the problem that the raw material squeezed out of the grinding disc is not fully ground, resulting in the particle size being too large and not suitable for preparing nylon 6 in-situ colored slices. Please refer to Figure 1-9 A nylon 6 in-situ colored slice and a preparation method thereof, comprising the following steps:

[0041] S1. Add 2 to 40 parts of carbon black, 10 to 50 parts of reaction aid, 0.2 to 2.0 parts of pH aid, and 0.1 to 1.0 parts of coupling agent to 20 to 80 parts of deionized water by weight, and process the carbon black using a grinding device 1 to obtain a self-dispersible carbon black slurry with a particle size of 30 to 180 nanometers;

[0042] The reaction aid comprises:

[0043] a. Sodium nitrite, ammonium nitrite, magnesium nitrite or calcium nitrite;

[0044] b. Diazonium salt precursor;

[0045] The pH auxiliary agent includes one or more of hydrochloric acid, hydrobromic acid, sulfuric acid, phosphoric acid, nitric acid, oxalic acid, sodium hydroxide, potassium hydroxide, ethylamine, and diethylamine;

[0046] The coupling agent is a hyperbranched polyester with a polyhydroxyl and dendrite structure, the terminal group is a water-soluble group molecule, and the weight average molecular weight is 500 to 20,000;

[0047] S2. Mix the prepared self-dispersible carbon black slurry with polyamide precursor caprolactam monomer according to the mass percentage of carbon black and caprolactam of 0.1-50%, adopt polymerization process to in-situ polymerization and color nylon 6, and then carry out strip casting and pelletizing process to obtain nylon 6 in-situ colored slices.

[0048] The carbon black is one or more of acidic carbon black, neutral carbon black and basic carbon black.

[0049] The grinding device 1 comprises a grinding shell 101, in which a grinding disc 102 for grinding raw materials is arranged, a connecting shaft 103 is fixedly connected to the grinding disc 102, one end of the connecting shaft 103 is fixedly connected to a driving motor 104, a side wall of the connecting shaft 103 is provided with an adsorption power device 3, and the adsorption power device 3 is connected to a suction device 2 for adsorbing raw materials located outside the grinding disc 102 through a connecting member 5. (As for how the grinding disc 102 grinds the raw materials, its working principle is the prior art, and this scheme will not be described in detail).

[0050] The suction device 2 includes a material scraping block 201 fixedly connected to the grinding disc 102 , a material suction head 203 is arranged in the material scraping block 201 , one side of the material suction head 203 is connected to a No. 1 hose 205 , and a connecting component 5 is arranged at the other end of the No. 1 hose 205 .

[0051] The adsorption power device 3 includes a suction bin 301 fixedly connected to the side wall of the connecting shaft 103, a piston plate 302 is slidably connected in the suction bin 301, a track groove No. 1 308 is provided at one end of the piston plate 302, and the track groove No. 1 308 is opened in the driving block 307, and the driving block 307 is fixedly connected to the grinding shell 101.

[0052] A rotating groove 303 is provided at the bottom of the piston plate 302, and a lifting rod 304 is rotatably connected in the rotating groove 303. The lifting rod 304 passes through the hollow baffle 305, and the hollow baffle 305 is fixedly connected to the inner wall of the suction bin 301. A No. 2 spring 306 is fixedly connected to the bottom of the piston plate 302, and the other end of the No. 2 spring 306 is fixedly connected to the hollow baffle 305. The design of the hollow baffle 305 divides the suction bin 301 into two areas. The hollow baffle 305 with a hollow design ensures that the change of air pressure in the suction bin 301 will not be affected by the hollow baffle 305, while ensuring the installation of the No. 2 spring 306.

[0053] The connecting component 5 includes a suction folded tube 501 connected to the suction bin 301, the other end of the suction folded tube 501 is connected to a No. 1 hose 205, a No. 1 one-way valve 502 is installed in the suction folded tube 501, the bottom of the suction bin 301 is connected to a discharge pipe 503, the discharge pipe 503 is connected to a discharge hose 504, a No. 2 one-way valve 505 is installed in the discharge pipe 503, and a resistance rod 506 fixedly connected to the bottom of the lifting rod 304 is provided in the discharge pipe 503, and the resistance rod 506 is used to control the opening and closing of the No. 2 one-way valve 505.

[0054] While the grinding disc 102 is grinding the raw material, the aggregate scraper block 201 located on the side wall of the grinding disc 102 scrapes the raw material squeezed out of the grinding area. The scattered raw materials can be gathered together through the rotation and scraping of the aggregate scraper block 201, so that the suction head 203 on the aggregate scraper block 201 can absorb the scattered raw materials again under the drive of the adsorption power device 3.

[0055] When the grinding disc 102 rotates, the connecting shaft 103 will rotate synchronously with the suction bin 301. The piston plate 302 sliding in the suction bin 301 will have a tendency to move upward under the drive of the second spring 306. Through the resistance of the second spring 306, one end of the piston plate 302 always resists in the first track groove 308. Since the first track groove 308 is an irregular plane, such as Figure 4 As shown, therefore, while the connecting shaft 103 rotates with the suction bin 301, the piston plate 302 will reciprocate in the suction bin 301 due to the concave-convex design of the No. 1 track groove 308 and the drive of the No. 2 spring 306. The reciprocating motion of the piston plate 302 causes the air pressure in the suction bin 301 to change continuously. Through this change, the raw materials can be continuously sucked through the suction head 203 and re-transported to the grinding area to ensure the grinding cycle and further ensure the sufficient grinding of the raw materials.

[0056] When the piston plate 302 is driven upward by the No. 2 spring 306, negative pressure is generated inside the suction bin 301, and the suction bin 301 needs to absorb gas from the suction folded tube 501 and the discharge tube 503 to the outside. Due to the design of the No. 2 one-way valve 505 in the discharge tube 503, the discharge tube 503 is in a blocked state at this time. At this time, the suction bin 301 will absorb gas through the suction folded tube 501, and the suction folded tube 501 is connected to the suction head 203 through the No. 1 hose 205. At this time, one end of the suction head 203 is located outside the extruded grinding disc 102 and is collected. The negative pressure generated by the suction bin 301 will absorb the raw materials concentrated in the scraper block 201. Since the negative pressure generated by the piston plate 302 is not very large, the raw materials may not be directly sucked into the suction bin 301. Therefore, multiple groups of No. 1 one-way valves 502 are arranged in the No. 1 hose 205 and the suction folded tube 501. Through the design of multiple groups of No. 1 one-way valves 502, the channels can be divided into multiple spaces, so that each time the suction bin 301 generates negative pressure, a part of the raw materials will be sucked into the next space until they enter the suction bin 301.

[0057] When the piston plate 302 is resisted and lowered by the No. 1 track groove 308, the lifting rod 304 and the resistance rod 506 located at the bottom of the piston plate 302 will resist the No. 2 one-way valve 505 in the discharge pipe 503, driving the No. 2 one-way valve 505 to open. At this time, the raw material in the suction bin 301 will enter the return channel 401 through the opened discharge pipe 503. Through the connection of the return channel 401, the raw material squeezed out of the grinding disc 102 can re-enter the grinding area.

[0058] Through this design, the raw materials squeezed out during the grinding process can enter the grinding area again for grinding, ensuring that each raw material can be fully ground to obtain raw material particles of appropriate particle size, thereby ensuring the stability of the preparation of nylon 6 in-situ colored slices.

[0059] The driving motor 104 is mounted on the mounting frame 105, and the mounting frame 105 is fixedly connected to the driving block 307. The driving motor 104 serves as a driving end and provides power support for the grinding work of the grinding disc 102.

[0060] A feed component 4 is provided in the grinding disc 102, and the feed component 4 includes a return channel 401 and a feed channel 402 which are opened in the grinding disc 102, the return channel 401 is connected with the discharge hose 504, the feed channel 402 is connected with the feed hose 403, the other end of the feed hose 403 is fixedly connected to the connecting hole plate 404, the connecting hole plate 404 is fixedly connected to the side wall of the connecting shaft 103, and a feed straight pipe 405 is fixedly connected to the connecting hole plate 404.

[0061] The design of the feed component 4 provides raw materials for the grinding of the grinding disc 102. The opening of the return channel 401 provides a return channel for the raw materials squeezed out of the grinding disc 102. The design of the feed hose 403, the connecting orifice plate 404 and the feed straight pipe 405 is used to directly deliver the unground raw materials into the grinding area. The connecting orifice plate 404 and the feed straight pipe 405 are made of hard materials to prevent the problem of the pipeline being squeezed during the rotation of the connecting shaft 103 and the suction bin 301. Therefore, fixing the pipeline on the connecting shaft 103 through the connecting orifice plate 404 can effectively prevent the suction bin 301 from contacting the pipeline, directly avoiding the situation where the pipeline is squeezed and cannot be fed. The feed hose 403 with a hose design has greater ductility and flexibility. This feature makes the installation between the feed hose 403 and the feed channel 402 more convenient.

[0062] Example 2: This example is intended to help solve the problem of the accumulation of raw materials entering the suction bin through the suction folding tube. This example is an explanation based on Example 1. For details, please refer to Figure 1-9 A stirring device 6 is arranged in the lifting rod 304, and the stirring device 6 includes a spiral groove 601 opened in the lifting rod 304, a slider 602 is slidably connected in the spiral groove 601, and the slider 602 is fixedly connected in the hollow baffle 305, and a stirring rod 603 is fixedly connected to the side wall of the lifting rod 304.

[0063] In order to prevent the raw materials entering the suction bin 301 from accumulating in the suction bin 301, if these raw materials accumulate at the discharge pipe 503, it may cause blockage in the discharge pipe 503, resulting in the problem that the raw materials cannot be discharged, the stirring device 6 is designed to break up the raw materials entering the suction bin 301 through the stirring rod 603, so that the raw materials are evenly distributed in the suction bin 301. When the piston plate 302 is raised or lowered, the lifting rod 304 will be lifted or lowered synchronously with it, because the lifting rod 304 is provided with a spiral groove 601, and because the lifting rod 304 and the hollow baffle plate 305 slide relative to each other, at this time, through the fixed The slider 602 fixed on the hollow baffle plate 305 slides in the spiral groove 601. Through this design, the lifting rod 304 will rotate when it is lifted or lowered. The rotation of the lifting rod 304 can drive the stirring rod 603 at the bottom of the lifting rod 304 to rotate. The stirring rod 603 rotates and stirs in the suction bin 301, so that the raw materials accumulated on one side can be effectively dispersed, and the raw materials can be effectively prevented from accumulating on one side of the suction bin 301. At the same time, the raw materials can be broken up by stirring, so that the materials are fully mixed, which is convenient for the subsequent grinding device 1 to grind the materials in a cycle.

[0064] Example 3: This example is intended to help solve the problem that the fixed suction head cannot completely absorb all the extruded raw materials. This example is an explanation based on Example 2. For details, please refer to Figure 1-9 A slide groove 202 is provided in the aggregate scraper block 201, and a suction head 203 is slidably connected in the slide groove 202. A spring No. 1 204 is fixedly connected to one side of the suction head 203, and the other end of the spring No. 1 204 is fixedly connected in the aggregate scraper block 201. A sliding shaft 206 is fixedly connected to the side of the suction head 203 away from the spring No. 1 204, and the other end of the sliding shaft 206 is slidably connected in the track groove No. 2 207, which is provided on the inner wall of the grinding shell 101.

[0065] By rotating and scraping the aggregate scraper 201, the scattered raw materials can be gathered together, so that the suction head 203 on the aggregate scraper 201 can suck up the scattered raw materials again under the drive of the adsorption power device 3 and transport them to the grinding area, thereby realizing the cyclic grinding of the materials and ensuring the preparation accuracy of nylon 6 in-situ colored slices.

[0066] By opening a slide groove 202 in the aggregate scraper block 201, the suction head 203 has a sliding space, and by fixing a sliding shaft 206 on one side of the suction head 203 and installing a No. 1 spring 204 on the other side, one end of the sliding shaft 206 always contacts the No. 2 track groove 207. The No. 2 track groove 207 is referred to as Fig. 9 By means of the concave-convex design of the No. 2 track groove 207 and the No. 1 spring 204, the sliding shaft 206 is always driven to abut against the No. 2 track groove 207. It can be achieved that while the grinding disc 102 rotates, the No. 2 track groove 207 and the No. 1 spring 204 will continuously drive the suction head 203 to slide left and right in the slide groove 202. Through this sliding, the suction range of the suction head 203 is made larger, which further improves the suction effect of the extruded raw materials and improves the efficiency of the raw material recovery and circulation grinding.

[0067] This embodiment also discloses a nylon 6 in-situ colored slice, which is prepared according to a method for preparing a nylon 6 in-situ colored slice.

[0068] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0069] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for preparing nylon 6 in-situ colored slices, characterized in that: The steps include: S1. Add 2 to 40 parts of carbon black, 10 to 50 parts of a reaction aid, 0.2 to 2.0 parts of a pH aid, and 0.1 to 1.0 parts of a coupling agent to 20 to 80 parts of deionized water, and grind the carbon black using a grinding device (1) to obtain a self-dispersible carbon black slurry with a particle size of 30 to 180 nanometers. The reaction aid comprises: a. Sodium nitrite, ammonium nitrite, magnesium nitrite or calcium nitrite; b. Diazonium salt precursor; The pH auxiliary agent includes one or more of hydrochloric acid, hydrobromic acid, sulfuric acid, phosphoric acid, nitric acid, oxalic acid, sodium hydroxide, potassium hydroxide, ethylamine, and diethylamine; The coupling agent is a hyperbranched polyester with a polyhydroxyl and dendrite structure, the terminal group is a water-soluble group molecule, and the weight average molecular weight is 500 to 20,000; The grinding device (1) comprises a grinding shell (101), a grinding disc (102) for grinding raw materials is arranged inside the grinding shell (101), a connecting shaft (103) is fixedly connected to the grinding disc (102), one end of the connecting shaft (103) is fixedly connected to a driving motor (104), a side wall of the connecting shaft (103) is provided with an adsorption power device (3), and the adsorption power device (3) is connected to a material suction device (2) for adsorbing raw materials located outside the grinding disc (102) through a connecting member (5); The material suction device (2) comprises a material scraping block (201) fixedly connected to the grinding disc (102), a material suction head (203) being arranged in the material scraping block (201), one side of the material suction head (203) being connected to a first hose (205), and the other end of the first hose (205) being provided with the connecting member (5); S2, mixing the prepared self-dispersible carbon black slurry with polyamide precursor caprolactam monomer according to the mass percentage of carbon black and caprolactam of 0.1-50%, using a polymerization process to in-situ polymerize and color nylon 6, and then performing a strip casting and pelletizing process to obtain a nylon 6 in-situ colored slice; The adsorption power device (3) comprises a suction bin (301) fixedly connected to the side wall of the connecting shaft (103), a piston plate (302) being slidably connected in the suction bin (301), a first track groove (308) being provided at one end of the piston plate (302), the first track groove (308) being opened in a driving block (307), and the driving block (307) being fixedly connected to the grinding shell (101); The aggregate scraper block (201) is provided with a slide groove (202), the suction head (203) is slidably connected in the slide groove (202), one side of the suction head (203) is fixedly connected to a spring (204), the other end of the spring (204) is fixedly connected in the aggregate scraper block (201), the suction head (203) is fixedly connected to a sliding shaft (206) on a side away from the spring (204), the other end of the sliding shaft (206) is slidably connected in a track groove (207), and the track groove (207) is provided on the inner wall of the grinding shell (101).

2. The method for preparing a nylon 6 in-situ colored slice according to claim 1, characterized in that: The carbon black is one or more of acidic carbon black, neutral carbon black and basic carbon black.

3. The method for preparing a nylon 6 in-situ colored slice according to claim 2, characterized in that: The driving motor (104) is mounted on a mounting frame (105), and the mounting frame (105) is fixedly connected to the driving block (307).

4. The method for preparing a nylon 6 in-situ colored slice according to claim 3, characterized in that: A rotation groove (303) is formed at the bottom of the piston plate (302), a lifting rod (304) is rotatably connected in the rotation groove (303), the lifting rod (304) passes through a hollow baffle (305), the hollow baffle (305) is fixedly connected to the inner wall of the suction bin (301), and a No. 2 spring (306) is fixedly connected to the bottom of the piston plate (302), the other end of the No. 2 spring (306) is fixedly connected to the hollow baffle (305).

5. The method for preparing a nylon 6 in-situ colored slice according to claim 4, characterized in that: The connecting component (5) comprises a suction folded pipe (501) connected to the suction bin (301), the other end of the suction folded pipe (501) being connected to a first hose (205), a first check valve (502) being installed in the suction folded pipe (501), a discharge pipe (503) being connected to a discharge hose (504) at the bottom of the suction bin (301), a second check valve (505) being installed in the discharge pipe (503), and a resistance rod (506) being fixedly connected to the bottom of the lifting rod (304) being provided in the discharge pipe (503), the resistance rod (506) being used to control the opening and closing of the second check valve (505).

6. The method for preparing a nylon 6 in-situ colored slice according to claim 5, characterized in that: A feed component (4) is arranged in the grinding disc (102), and the feed component (4) comprises a return channel (401) and a feed channel (402) opened in the grinding disc (102); the return channel (401) is connected to the discharge hose (504); the feed channel (402) is connected to a feed hose (403); the other end of the feed hose (403) is fixedly connected to a connecting hole plate (404); the connecting hole plate (404) is fixedly connected to a side wall of the connecting shaft (103); and a feed straight pipe (405) is fixedly connected to the connecting hole plate (404).

7. The method for preparing a nylon 6 in-situ colored slice according to claim 6, characterized in that: A stirring device (6) is provided in the suction bin (301), and the stirring device (6) comprises a spiral groove (601) provided in the lifting rod (304), a slider (602) being slidably connected in the spiral groove (601), the slider (602) being fixedly connected in the hollow baffle (305), and a stirring rod (603) being fixedly connected to the side wall of the lifting rod (304).

8. A nylon 6 in-situ colored slice, characterized in that: The method for preparing a nylon 6 in-situ colored slice according to any one of claims 1 to 7 is used.

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