CN114457200B - Preparation process of polyurethane leather - Google Patents

Abstract

The invention relates to the field of polyurethane leather, in particular to a preparation process of polyurethane leather. Comprises the steps of preparing polyurethane fabric, coating, washing with water and drying. The washing device comprises a water tank, a first guide roller, a second guide roller, a third guide roller, a rotary drum and a rolling brush. The rotary drum is provided with an inner cavity, the rotating shaft of the rotary drum extends to the inner cavity, the rotating shaft is of a hollow structure, and the rotating shaft is communicated with an external water supply pipe. The side wall of the rotary drum is provided with a water spray hole for communicating the inner cavity with the outside. The descending section and the ascending section of the leather channel in the water tank are respectively provided with a rotary drum group and a rolling brush group, and the rotary drum group is arranged on one side of the rolling brush group, which is close to the bottom of the water tank. The novel leather washing machine can effectively improve the washing effect, ensures the washing effect, simultaneously improves the washing efficiency, has positive significance for improving the whole production efficiency of leather, and is simple in structure and convenient to popularize and apply.

Description

Preparation process of polyurethane leather

Technical Field

The invention relates to the field of polyurethane leather, in particular to a preparation process of polyurethane leather.

Background

In the traditional leather production process, production efficiency is lower, especially in the process of washing, the washing effect is unstable, and the washing effect often has larger fluctuation, so that the quality of the leather can be imaged, and the normal production rhythm can be influenced.

In view of this, the present application is specifically proposed.

Disclosure of Invention

The invention aims to provide a preparation process of polyurethane leather, which can effectively improve the water washing effect, ensure the water washing effect and improve the water washing efficiency, and has positive significance for improving the whole production efficiency of the leather.

Embodiments of the present invention are implemented as follows:

a process for preparing polyurethane leather, comprising: preparing polyurethane fabric, coating the polyurethane fabric on the surface of leather, washing the leather by adopting a washing device after the polyurethane fabric is solidified, and drying the leather after the washing is finished.

Wherein, the washing device includes: the device comprises a water tank, a first guide roller, a second guide roller, a third guide roller, a rotary drum and a rolling brush.

The first guide roller and the third guide roller are arranged at the mouth part of the water tank and are respectively arranged at two sides of the water tank, and the second guide roller is arranged at the bottom of the water tank, so that leather can pass through the water tank through the first guide roller, the second guide roller and the third guide roller in sequence, and the part of the leather in the water tank is in a V shape.

The rotary drum is rotatable and mountable in the basin and locate above the water line, and the rotary drum has the inner chamber, and the pivot of rotary drum extends to the inner chamber, and the pivot is hollow structure, pivot and outside delivery pipe intercommunication. The side wall of the rotary drum is provided with a water spray hole for communicating the inner cavity with the outside.

The two groups of rotating drums are arranged in parallel at intervals to form a rotating drum group, and a gap for leather to pass through is reserved between the two groups of rotating drums in the rotating drum group. The two groups of rolling brushes are arranged in parallel at intervals to form a rolling brush group, and a gap for leather to pass through is reserved between the two groups of rolling brushes in the rolling brush group.

The descending section and the ascending section of the leather channel in the water tank are respectively provided with a rotary drum group and a rolling brush group, and the rotary drum group is arranged on one side of the rolling brush group, which is close to the bottom of the water tank.

Further, the external section is installed on the rotating shaft, and the external section is also of a hollow structure. The external section is coaxially arranged with the rotating shaft, the external section is rotatably connected with the rotating shaft, the hollow channel of the external section is communicated with the hollow channel of the rotating shaft, and the external section and the rotating shaft are rotationally sealed. The external section is located the outside of rotary drum, and the one end that external section kept away from the rotary drum is provided with the butt joint portion that is used for being connected with outside delivery pipe.

Further, the drum comprises: barrel, baffle and pivot. The inner cavity is arranged in the middle of the cylinder body, and the water spraying hole is arranged on the side wall of the cylinder body. The rotating shaft is fixedly connected with a guide rod, and the guide rod is arranged along the radial direction of the rotating shaft and is positioned in the inner cavity. The baffle sets up along the axial of barrel, and baffle slidable ground cooperates in the guide arm, and the butt has the elastic component between baffle and the pivot to be used for promoting the baffle laminating in the inside wall of barrel and with the hole for water spraying shutoff.

The rotary drum is also provided with an auxiliary driving component for driving the baffle to move along the guide rod towards one side of the rotary shaft so as to enable the water spraying hole to open to spray water towards leather.

Further, the rotating shaft comprises a first shaft body, a second shaft body and a third shaft body. The first shaft body, the second shaft body and the third shaft body are all arranged on the same axis as the cylinder.

The first shaft body is cylindrical and is connected with one end of the cylinder body. The second shaft body is connected to the other end of the cylinder body, and the second shaft body is matched with the external section. The third shaft body is accommodated in the first shaft body and is rotatably matched with the first shaft body, the end part of the third shaft body extends to the second shaft body and is rotatably matched with the end part of the second shaft body, and one end of the third shaft body far away from the second shaft body is fixedly connected with the water tank. The outside of the first shaft body is provided with a transmission part which is used for being in transmission fit with the driving device.

The guide rod is fixedly connected to the first shaft body and/or the second shaft body.

One side of the baffle, which is close to the third shaft body, is fixedly connected with a pull rod, the pull rod extends towards the third shaft body, and the end part of the pull rod is provided with a roller.

The auxiliary driving assembly comprises a limiting ring, the third shaft body is fixedly connected with the limiting ring, and the wheel surface of the idler wheel is attached to the inner annular wall of the limiting ring. The inner annular wall of the limiting ring is provided with the protruding portion, so that when the roller moves to the protruding portion along the inner annular wall of the limiting ring, the protruding portion pulls the pull rod towards one side where the third shaft body is located through the roller, and therefore the baffle is separated from the inner wall of the barrel, and the water spraying hole is opened.

Further, the first shaft body and the second shaft body are fixedly connected with guide rods, and the other ends of the guide rods are fixedly connected with the inner wall of the cylinder.

Further, the limiting ring comprises a ring body and a connecting plate. The connecting plate is discoid connecting plate perpendicular to the third axis body setting, and the three concentric setting of ring body, connecting plate and third axis body.

The internal diameter of the torus is matched with the external diameter of the connecting plate, and the torus is fixedly arranged on the third shaft body through the connecting plate. The thickness of the connecting plate is smaller than that of the torus along the axial direction of the third shaft body.

A half shell is formed by a torus and a connecting plate, and each limiting ring comprises two groups of half shells. In each limiting ring, two groups of half shells are arranged in parallel at intervals, and the connecting plates are arranged close to the outer sides of the annular bodies opposite to the limiting rings.

The pull rod extends into the gap between the two groups of half shells of the limiting ring, and the idler wheels are respectively attached to the inner annular walls of the annular bodies of the two groups of half shells of the limiting ring. The protruding part is arranged on the inner annular wall of the annular body.

Further, smooth processing is carried out between the two ends of the protruding part and the inner annular wall of the annular body.

Further, the water spray holes are distributed along the circumferential direction of the cylinder, and the baffle plates are distributed along the circumferential direction of the cylinder in a plurality of groups so as to be used for plugging the water spray holes at different positions. The bulge is arranged on one side of the torus close to the leather passage, so that the water spray hole is opened when the water spray hole faces the leather passage, and the water spray hole is closed when the water spray hole is far away from the leather passage.

Further, the distance between the two groups of half shells in the limiting ring is slightly larger than the outer diameter of the pull rod, rollers are mounted on two sides of the pull rod, the rollers on two sides of the pull rod are respectively attached to the inner annular walls of the two groups of half shells in the limiting ring, and a gap is reserved between each roller and the connecting plate.

Further, when the polyurethane fabric is prepared, the polyurethane fabric comprises: 100 parts by weight of aqueous polyurethane, 0.3-0.8 part by weight of aqueous flatting agent, 0.3-0.8 part by weight of aqueous thickening agent, 0.3-1.2 parts by weight of aqueous defoaming agent and 10-25 parts by weight of water are selected, mixed and stirred for 30-60 min, the stirring speed is 800-1200 rpm, and the material viscosity is 800-1200 cps (20 ℃).

The technical scheme of the embodiment of the invention has the beneficial effects that:

the preparation process of the polyurethane leather provided by the embodiment of the invention can effectively improve the water washing effect, ensures the water washing effect, and simultaneously improves the water washing efficiency, thereby having positive significance for improving the whole production efficiency of the leather.

In the water washing process, the water spraying holes on the rotary drum can not spray water at the same time, but only the water spraying holes facing the leather can be opened to spray water, and other water spraying holes are in a closed state, so that the water quantity is saved, the sprayed water can be ensured to be sprayed to the surface of the leather accurately, and a good cleaning effect can be achieved by matching with the rolling brush.

The water tank is provided with a drainage pipeline for controlling the stability of the water level in the water tank. The water is stored in the water tank, the descending section of leather is washed by a group of rotating drums and a group of rolling brushes, and then water is washed once in the water tank, so that the surface can be effectively cleaned, and finally the ascending section of leather is washed by a group of rotating drums and a group of rolling brushes, so that residues can be effectively reduced, and the cleaning effect is remarkably improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of the overall structure of a water washing device according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of a drum of a washing apparatus according to an embodiment of the present invention;

FIG. 3 is a schematic view of a part of a drum of a washing apparatus according to an embodiment of the present invention;

FIG. 4 is a schematic view of a drum of a washing apparatus according to another embodiment of the present invention;

FIG. 5 is a schematic view of the arrangement of the protruding portion of the drum of the washing device according to the embodiment of the present invention;

FIG. 6 is a schematic diagram showing the matching relationship between a drum and a leather passage of a washing device according to an embodiment of the present invention;

FIG. 7 is a schematic view of a first operational state of a drum of a washing apparatus according to an embodiment of the present invention;

FIG. 8 is a schematic view of a second operational state of a drum of a washing apparatus according to an embodiment of the present invention;

fig. 9 is a schematic view illustrating a third working state of a drum of a washing device according to an embodiment of the present invention.

Reference numerals illustrate:

a water washing device 1000; a downstream segment 100; an upstream section 200; a water tank 300; a first guide roller 310; a second guide roller 320; a third guide roller 330; a drum 400; a cylinder 410; an inner cavity 411; a water spray hole 412; a baffle 420; sliding sleeve 421; bumps 422; a pull rod 423; a roller 424; a rotation shaft 430; a first shaft 431; a transmission portion 431a; a second shaft body 432; a water outlet hole 432a; a third shaft 433; a guide rod 440; an elastic member 450; an external section 460; a stop collar 500; a boss 510; a torus 520; a connection plate 530; a half shell 540; a roller brush 600.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

The terms "first," "second," "third," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "parallel," "perpendicular," and the like, do not denote that the components are required to be absolutely parallel or perpendicular, but may be slightly inclined. For example, "parallel" merely means that the directions are more parallel than "perpendicular" and does not mean that the structures must be perfectly parallel, but may be slightly tilted.

In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

Examples

The embodiment provides a preparation process of polyurethane leather, which comprises the following steps: preparing polyurethane fabric, coating the polyurethane fabric on the surface of leather, washing the leather by adopting a washing device 1000 after the polyurethane fabric is solidified, and drying the leather after washing.

Please refer to fig. 1, 2 and 3, wherein the water washing apparatus 1000 includes: a water tub 300, a first guide roller 310, a second guide roller 320, a third guide roller 330, a drum 400, and a rolling brush 600.

The first guide roller 310 and the third guide roller 330 are provided at the mouth of the tub 300 and are provided at both sides of the tub 300, and the second guide roller 320 is provided at the bottom of the tub 300, so that the leather can pass through the tub 300 through the first guide roller 310, the second guide roller 320 and the third guide roller 330 in sequence, and the portion of the leather in the tub 300 is V-shaped.

The rotary drum 400 is rotatably installed in the water tank 300 and above the water level, the rotary drum 400 has an inner cavity 411, a rotary shaft 430 of the rotary drum 400 extends to the inner cavity 411, the rotary shaft 430 is of a hollow structure, and the rotary shaft 430 is communicated with an external water supply pipe. The sidewall of the drum 400 is provided with a water spray hole 412 for communicating the inner cavity 411 with the outside.

The two groups of drums 400 are arranged in parallel and at intervals to form a drum 400 group, and a gap for leather to pass through is reserved between the two groups of drums 400 in the drum 400 group. The two groups of rolling brushes 600 are arranged in parallel and at intervals to form a rolling brush 600 group, and gaps for leather to pass through are reserved between the two groups of rolling brushes 600 in the rolling brush 600 group.

The downstream section 100 and the upstream section 200 of the leather passage in the tank 300 are each provided with a drum 400 set and a roller brush 600 set, the drum 400 set being disposed on one side of the roller brush 600 set near the bottom of the tank 300.

In general, the preparation process of the polyurethane leather provided by the embodiment of the invention can effectively improve the water washing effect, ensures the water washing effect and improves the water washing efficiency, so that the preparation process has positive significance for improving the overall production efficiency of the leather, and is simple in structure and convenient to popularize and apply.

Referring to fig. 4, 5 and 6, in particular, in the present embodiment, the drum 400 includes: barrel 410, baffle 420 and spindle 430. Barrel 410 is cylindric, and inner chamber 411 is offered in barrel 410 in middle of, and inner chamber 411 is cylindric also, and inner chamber 411 and barrel 410 coaxial setting. The water spraying hole 412 is formed in a side wall of the cylinder 410, and the water spraying hole 412 communicates the inner cavity 411 of the cylinder 410 with the outside.

The rotating shaft 430 is fixedly connected with a guide rod 440, and the guide rod 440 is disposed along the radial direction of the rotating shaft 430 and is located in the inner cavity 411. The baffle 420 is disposed along the axial direction of the cylinder 410, the baffle 420 is slidably engaged with the guide rod 440, and an elastic member 450 is abutted between the baffle 420 and the rotating shaft 430, so as to push the baffle 420 to be attached to the inner sidewall of the cylinder 410 and seal the water spraying hole 412.

The drum 400 is further provided with an auxiliary driving assembly for driving the baffle 420 along the guide rod 440 toward the side where the rotation shaft 430 is located, so that the water spraying holes 412 are opened to spray water toward the leather.

The rotating shaft 430 is provided with an external section 460, and the external section 460 is also of a hollow structure. The external section 460 is coaxially arranged with the rotating shaft 430, the external section 460 is rotatably connected with the rotating shaft 430, and the hollow channel of the external section 460 is communicated with the hollow channel of the rotating shaft 430, and the external section 460 and the rotating shaft 430 are rotationally sealed. The external section 460 is located outside the drum 400, and an end of the external section 460 remote from the drum 400 is provided with a docking portion for connection with an external water supply pipe.

The rotating shaft 430 includes a first shaft body 431, a second shaft body 432, and a third shaft body 433. The first shaft body 431, the second shaft body 432, and the third shaft body 433 are all disposed coaxially with the cylinder 410.

The first shaft 431 is cylindrical and is fixedly connected to one end of the cylinder 410. The second shaft 432 is fixedly connected to the other end of the cylinder 410, and the second shaft 432 is matched with the external section 460. The second shaft 432 has a cavity therein, and one end of the second shaft 432 outside the cylinder 410 is rotatably connected to the external connection section 460 to realize a rotary seal, and the external connection section 460 is in communication with the internal cavity of the second shaft 432, so that the external connection section 460 can drain water in the external water supply pipe into the cavity of the second shaft 432. The sidewall of the second shaft body 432 is provided with water outlet holes 432a for pouring water into the inner cavity 411 of the barrel 410, and the water outlet holes 432a are uniformly spaced along the circumferential direction of the second shaft body 432.

The third shaft body 433 is accommodated in the first shaft body 431 and rotatably engaged with the first shaft body 431, an end of the third shaft body 433 extends to an end of the second shaft body 432 close to the first shaft body 431 and rotatably engaged with an end of the second shaft body 432, and an end of the third shaft body 433 remote from the second shaft body 432 is fixedly connected with the water tank 300. Inside the cylinder 410, the first shaft body 431 and the second shaft body 432 are spaced apart from each other, and are disposed at both ends of the cylinder 410, and a portion of the third shaft body 433 between the first shaft body 431 and the second shaft body 432 is exposed.

The outside of the first shaft body 431 is provided with a transmission portion 431a for transmission engagement with an external driving device.

Through the design, the third shaft body 433 is fixed, the first shaft body 431 is driven by the external driving device through the transmission part 431a, and the first shaft body 431 can rotate relative to the third shaft body 433, so that the cylinder 410 is driven to rotate, and when the cylinder 410 rotates, the second shaft body 432 also rotates along with the cylinder 410, and the second shaft body 432 also rotates relative to the external section 460. In this way, not only can the cylinder 410 be supported, but also the external water supply pipe can smoothly supply water into the cylinder 410 while ensuring that the cylinder 410 can normally rotate.

Further, the guide rod 440 is fixedly connected to the first shaft body 431 and/or the second shaft body 432, specifically, the first shaft body 431 and the second shaft body 432 are fixedly connected to the guide rod 440, and the other end of the guide rod 440 is fixedly connected to the inner wall of the cylinder 410. This not only improves the structural stability of the guide rod 440, but also enables the barrier 420 to move more stably, and further enhances the structural stability between the cylinder 410 and the rotation shaft 430.

The baffle 420 is close to the side of pivot 430 and still is provided with sliding sleeve 421, and sliding sleeve 421 fixed connection is in the face of baffle 420, and sliding sleeve 421 slidable cover is located guide arm 440, and elastic component 450 is the column spring, and elastic component 450 cover is located guide arm 440, and elastic component 450 butt is in between the tip of sliding sleeve 421 and first pivot 430 (or second pivot 430). In this way, the stability of the baffle 420 when sliding along the guide rod 440 can be further improved, and the baffle 420 is prevented from being jammed during the sliding process.

The baffle 420 is further provided with a plurality of protruding points 422 on one side far away from the rotating shaft 430, the shape and the size of the protruding points 422 are matched with those of the water spraying holes 412 on the cylinder 410, and when the baffle 420 is attached to the inner wall of the cylinder 410, the protruding points 422 are matched with the water spraying holes 412, so that the blocking effect on the water spraying holes 412 is improved.

The baffle 420 is also fixedly connected with a pull rod 423 near one side of the third shaft body 433, the pull rod 423 extends towards the third shaft body 433, and the end part of the pull rod 423 is provided with a roller 424.

The auxiliary driving assembly comprises a limiting ring 500, the third shaft body 433 is fixedly connected with the limiting ring 500, and the wheel surface of the roller 424 is attached to the inner annular wall of the limiting ring 500. The inner circumferential wall of the stopper 500 is provided with a protrusion 510 such that when the roller 424 moves to the protrusion 510 along the inner circumferential wall of the stopper 500, the protrusion 510 pulls the pull rod 423 toward the side of the third shaft 433 through the roller 424, thereby separating the baffle 420 from the inner wall of the cylinder 410 and opening the water spraying hole 412.

Specifically, the stop collar 500 includes a torus 520 and a connecting plate 530. The connecting plate 530 is a disc-shaped connecting plate 530 perpendicular to the third shaft 433, and the annular body 520, the connecting plate 530 and the third shaft 433 are concentrically arranged.

The inner diameter of the torus 520 is matched with the outer diameter of the connecting plate 530, and the torus 520 is fixedly arranged on the third shaft 433 through the connecting plate 530. The thickness of the connection plate 530 is smaller than the thickness of the torus 520 along the axial direction of the third shaft 433.

A torus 520 and a connecting plate 530 form a half of the housing 540, and each stop collar 500 includes two sets of housing halves 540. In each stop collar 500, two sets of half shells 540 are juxtaposed and spaced apart, and the connecting plates 530 are disposed adjacent to the outer sides of the torus 520 opposite the stop collars 500.

The pull rod 423 extends into the gap between the two sets of half shells 540 of the limiting ring 500, and the rollers 424 are respectively attached to the inner annular walls of the annular bodies 520 of the two sets of half shells 540 of the limiting ring 500. The boss 510 is provided on the inner circumferential wall of the torus 520.

The two ends of the protruding portion 510 are smoothed with the inner circumferential wall of the torus 520.

The distance between the two sets of half shells 540 in the limiting ring 500 is slightly larger than the outer diameter of the pull rod 423, the rollers 424 are mounted on two sides of the pull rod 423, the rollers 424 on two sides of the pull rod 423 are respectively attached to the inner annular walls of the two sets of half shells 540 in the limiting ring 500, and a gap is reserved between the rollers 424 and the connecting plate 530.

The water spray holes 412 are distributed along the circumferential direction of the cylinder 410, and the baffle plates 420 are distributed along the circumferential direction of the cylinder 410 in multiple groups so as to be used for blocking the water spray holes 412 at different positions.

In this embodiment, the plurality of limiting rings 500 are arranged at intervals along the length direction of the third shaft body 433, and the baffle 420 is correspondingly connected with a plurality of pull rods 423, which are respectively matched with the plurality of limiting rings 500; the baffles 420 are arranged at uniform intervals along the circumferential direction of the cylinder 410, and the plurality of baffles 420 jointly seal the water spraying holes 412 on the side wall of the cylinder 410

Referring to fig. 7, 8 and 9, the protrusion 510 of the stop collar 500 is installed on the side of the torus 520 near the leather passage, so that when the water spraying holes 412 are toward the leather passage, the roller 424 moves to the protrusion 510, and the water spraying holes 412 are smoothly opened, so that the water spraying holes 412 can accurately spray water to the leather. And when the water spray holes 412 are far from the leather passage, the roller 424 is away from the boss 510, and the water spray holes 412 are closed.

Through the design, the water spraying holes 412 on the rotary drum 400 can not spray water at the same time, but only the water spraying holes 412 facing the leather can be opened, and other water spraying holes 412 are in a closed state, so that the water quantity is saved, the sprayed water can be ensured to be sprayed to the surface of the leather accurately, and a good cleaning effect can be achieved by matching with the rolling brush 600.

The water tank 300 is provided with a drain pipe (not shown) for controlling the stabilization of the water level in the water tank 300. The water is stored in the water tank 300, after the descending section 100 of leather is washed by the group of the rotary drums 400 and the group of the rolling brushes 600, the surface of the descending section 100 of leather can be effectively cleaned by once water passing through the water tank 300, and finally, the ascending section 200 of leather is washed by the group of the rotary drums 400 and the group of the rolling brushes 600, so that residues can be effectively reduced, and the cleaning effect is remarkably improved.

In addition, the present embodiment also provides a configuration method of the polyurethane fabric, which is only an optional example, but not limited to this, and other types of polyurethane fabrics and configuration methods thereof may be flexibly selected according to actual needs.

An exemplary method of formulating a polyurethane fabric includes: 100 parts by weight of aqueous polyurethane, 0.3-0.8 part by weight of aqueous flatting agent, 0.3-0.8 part by weight of aqueous thickening agent, 0.3-1.2 parts by weight of aqueous defoaming agent and 10-25 parts by weight of water are selected, mixed and stirred for 30-60 min, the stirring speed is 800-1200 rpm, and the material viscosity is 800-1200 cps (20 ℃). Through the design, the original leather thickness is above 0.5MM, the water absorption is about 110%, the thickness is improved to be 0.42-0.48MM, and the water absorption is above 130%. And the consumption of raw materials is reduced. The original proportion of the raw materials is 0.6 kg to produce a finished product of 1 meter, and after improvement, 0.5 kg of the raw materials can produce the finished product of 1 meter.

In conclusion, the preparation process of the polyurethane leather provided by the embodiment of the invention can effectively improve the water washing effect, ensures the water washing effect and improves the water washing efficiency, so that the preparation process has positive significance for improving the overall production efficiency of the leather, and is simple in structure and convenient to popularize and apply.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (7)

1. A process for preparing polyurethane leather, comprising: preparing polyurethane fabric, coating the polyurethane fabric on the surface of leather, washing the leather by adopting a washing device after the polyurethane fabric is solidified, and drying the leather after washing;

wherein, the washing device includes: the device comprises a water tank, a first guide roller, a second guide roller, a third guide roller, a rotary drum and a rolling brush;

the first guide roller and the third guide roller are arranged at the mouth part of the water tank and are respectively arranged at two sides of the water tank, and the second guide roller is arranged at the bottom of the water tank, so that leather can pass through the water tank through the first guide roller, the second guide roller and the third guide roller in sequence, and the part of the leather in the water tank is in a V shape;

the rotary drum is rotatably arranged in the water tank and above a water level line, the rotary drum is provided with an inner cavity, a rotating shaft of the rotary drum extends to the inner cavity, the rotating shaft is of a hollow structure, and the rotating shaft is communicated with an external water supply pipe; the side wall of the rotary drum is provided with a water spraying hole for communicating the inner cavity with the outside;

the two groups of rotating drums are arranged in parallel at intervals to form a rotating drum group, and a gap for leather to pass through is reserved between the two groups of rotating drums in the rotating drum group; the two groups of rolling brushes are arranged in parallel at intervals to form a rolling brush group, and a gap for leather to pass through is reserved between the two groups of rolling brushes in the rolling brush group;

the rotary drum group and the rolling brush group are arranged on the lower section and the upper section of the leather channel in the water tank, and the rotary drum group is arranged on one side of the rolling brush group, which is close to the bottom of the water tank;

the rotating shaft is provided with an external section which is also of a hollow structure; the external section is coaxially arranged with the rotating shaft, the external section is rotatably connected with the rotating shaft, a hollow channel of the external section is communicated with a hollow channel of the rotating shaft, and the external section and the rotating shaft are rotationally sealed; the external connection section is positioned outside the rotary drum, and one end of the external connection section, which is far away from the rotary drum, is provided with a butt joint part used for being connected with an external water supply pipe;

the drum comprises: the cylinder body, the baffle and the rotating shaft; the inner cavity is arranged in the barrel, and the water spraying hole is arranged on the side wall of the barrel; the rotating shaft is fixedly connected with a guide rod, and the guide rod is arranged along the radial direction of the rotating shaft and is positioned in the inner cavity; the baffle is arranged along the axial direction of the cylinder body, the baffle is slidably matched with the guide rod, and an elastic piece is abutted between the baffle and the rotating shaft, so that the baffle is pushed to be attached to the inner side wall of the cylinder body and the water spraying hole is blocked; the rotary drum is also provided with an auxiliary driving assembly which is used for driving the baffle to move along the guide rod towards one side where the rotating shaft is located so that the water spraying hole is opened to spray water towards leather;

the rotating shaft comprises a first shaft body, a second shaft body and a third shaft body; the first shaft body, the second shaft body and the third shaft body are arranged coaxially with the cylinder body;

the first shaft body is cylindrical and is connected with one end of the cylinder body; the second shaft body is connected to the other end of the cylinder body, and is matched with the external section; the third shaft body is accommodated in the first shaft body and is rotatably matched with the first shaft body, the end part of the third shaft body extends to the second shaft body and is rotatably matched with the end part of the second shaft body, and one end of the third shaft body far away from the second shaft body is fixedly connected with the water tank; the outside of the first shaft body is provided with a transmission part which is used for being in transmission fit with the driving device;

the guide rod is fixedly connected to the first shaft body and/or the second shaft body;

a pull rod is fixedly connected to one side of the baffle, which is close to the third shaft body, and extends towards the third shaft body, and a roller is assembled at the end part of the pull rod;

the auxiliary driving assembly comprises a limiting ring, the third shaft body is fixedly connected with the limiting ring, and the wheel surface of the idler wheel is attached to the inner annular wall of the limiting ring; the inner annular wall of the limiting ring is provided with a protruding portion, so that when the roller moves to the protruding portion along the inner annular wall of the limiting ring, the protruding portion pulls the pull rod towards one side where the third shaft body is located through the roller, and the baffle is separated from the inner wall of the barrel, so that the water spraying hole is opened.

2. The process for preparing polyurethane leather according to claim 1, wherein the first shaft body and the second shaft body are fixedly connected with the guide rod, and the other ends of the guide rod are fixedly connected with the inner wall of the cylinder.

3. The process for preparing polyurethane leather according to claim 1, wherein the limiting ring comprises a torus and a connecting plate; the connecting plate is disc-shaped, the connecting plate is perpendicular to the third shaft body, and the annular body, the connecting plate and the third shaft body are concentrically arranged;

the inner diameter of the ring body is matched with the outer diameter of the connecting plate, and the ring body is fixedly arranged on the third shaft body through the connecting plate; the thickness of the connecting plate is smaller than that of the annular body along the axial direction of the third shaft body;

one ring body and one connecting plate form a half shell, and each limiting ring comprises two groups of half shells; in each limiting ring, two groups of half shells are arranged in parallel and at intervals, and the connecting plates are arranged close to the outer sides of the annular bodies opposite to the limiting rings;

the pull rod extends into a gap between the two groups of half shells of the limiting ring, and the idler wheels are respectively attached to the inner annular walls of the annular bodies of the two groups of half shells of the limiting ring; the protruding portion is arranged on the inner annular wall of the annular body.

4. The process for preparing polyurethane leather as claimed in claim 3, wherein a smoothing process is performed between both ends of the protruding portion and an inner circumferential wall of the torus.

5. The process for preparing polyurethane leather according to claim 3, wherein the water spraying holes are distributed along the circumferential direction of the cylinder, and the baffle plates are distributed along the circumferential direction of the cylinder in a plurality of groups so as to be used for blocking the water spraying holes at different positions; the bulge is arranged on one side of the torus close to the leather passage, so that the water spraying hole is opened when the water spraying hole faces the leather passage, and the water spraying hole is closed when the water spraying hole is far away from the leather passage.

6. The process for preparing polyurethane leather according to claim 3, wherein the distance between the two half shells in the limiting ring is slightly larger than the outer diameter of the pull rod, the rollers are mounted on two sides of the pull rod, the rollers on two sides of the pull rod are respectively attached to the inner annular walls of the two half shells in the limiting ring, and a gap is reserved between the rollers and the connecting plate.

7. The process for preparing polyurethane leather as claimed in claim 1, wherein the process for preparing the polyurethane fabric comprises: 100 parts by weight of aqueous polyurethane, 0.3-0.8 part by weight of aqueous flatting agent, 0.3-0.8 part by weight of aqueous thickening agent, 0.3-1.2 parts by weight of aqueous defoamer and 10-25 parts by weight of water, and the mixing and stirring time is 30-60 min, the stirring speed is 800-1200 rpm, and the blanking viscosity at 20 ℃ is 800-1200 cps.

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