阅读说明：本技术 皮革均匀染色的染色方法 (Dyeing method for uniformly dyeing leather ) 是由 姜开盛 苏建跃 白海东 王旭兴 于 2020-07-14 设计创作，主要内容包括：本发明属于皮革染色技术领域,尤其涉及一种皮革均匀染色的染色方法。本发明针对现有技术中皮革的染色均匀度不够理想的问题。提供一种皮革均匀染色的染色方法,包括将染色剂和辅助染色剂与水混合,搅拌均匀呈糊状,再补加水搅拌均匀,得染色液；将待染色皮革加入至染色机构内,再向染色机构内加入染色液,升温染色液至30-35℃,驱动染色机构转动染色1-2h；升温至50-55℃,驱动染色机构转动染色15min以内,得到均匀染色的皮革。本发明低温时辅助染色剂附着在皮革表面,阻碍皮革表面染色,此时染色剂渗透至皮革内部实现染色透心,高温时辅助染色剂脱离皮革表面,此时染色剂实现皮革表染,从而保证皮革表面、内外均具有较好的染色均匀度。(The invention belongs to the technical field of leather dyeing, and particularly relates to a dyeing method for uniformly dyeing leather. The invention aims at the problem that the leather dyeing uniformity in the prior art is not ideal. The dyeing method for uniformly dyeing the leather is provided, and comprises the steps of mixing a dyeing agent and an auxiliary dyeing agent with water, uniformly stirring the mixture into a paste, adding water, and uniformly stirring the mixture to obtain a dyeing solution; adding the leather to be dyed into a dyeing mechanism, adding a dyeing solution into the dyeing mechanism, heating the dyeing solution to 30-35 ℃, and driving the dyeing mechanism to rotate for dyeing for 1-2 hours; and heating to 50-55 ℃, driving a dyeing mechanism to rotate and dye for less than 15min, and obtaining the leather with uniform dyeing. The auxiliary coloring agent is attached to the surface of the leather at low temperature to prevent the surface of the leather from being dyed, the coloring agent penetrates into the leather to realize dyeing penetration, and the auxiliary coloring agent is separated from the surface of the leather at high temperature to realize surface dyeing of the leather, so that the surface, inside and outside of the leather have better dyeing uniformity.)

1. A dyeing method for uniformly dyeing leather is characterized by comprising the following steps:

the method comprises the following steps: mixing the coloring agent and the auxiliary coloring agent with water, stirring uniformly to form paste, adding water, and stirring uniformly to obtain a dyeing solution;

step two: adding the leather to be dyed into a dyeing mechanism (100), adding the dyeing solution prepared in the step one into the dyeing mechanism (100), heating the dyeing solution to 30-35 ℃, and driving the dyeing mechanism (100) to rotate for dyeing for 1-2 hours;

step three: and heating to 50-55 ℃, driving the dyeing mechanism (100) to rotate and dye for less than 15min, and obtaining the leather with uniform dyeing.

2. A dyeing process for the uniform dyeing of leather according to claim 1, characterized in that: dyeing mechanism (100) include frame (1) and rotate rotary drum (2) of connection in frame (1), and dyeing cavity (3) are located rotary drum (2), rotary drum (2) one end is connected with actuating mechanism (4) drive, and the other end rotates to be connected on hollow support rod (5), hollow support rod (5) and frame (1) fixed connection, the one end that rotary drum (2) were kept away from in hollow support rod (5) is equipped with dynamic sampling subassembly (6) that are used for acquireing the dyeing liquid in dyeing cavity (3), dynamic sampling subassembly (6) are linked together through hollow support rod (5) and dyeing cavity (3).

3. A dyeing process for the uniform dyeing of leather according to claim 2, characterized in that: the dynamic sampling assembly (6) comprises a main pipeline (61) communicated with the dyeing cavity (3) through a hollow support rod (5), a sampling pipeline (62) communicated with the main pipeline (61), and a valve (63) which is arranged on the sampling pipeline (62) and can close or open the sampling pipeline (62); the one end that hollow support pole (5) were kept away from in trunk line (61) extends to vertical ascending direction, the one end that trunk line (61) were kept away from in sampling pipe (62) extends to vertical decurrent direction.

4. A dyeing process for the uniform dyeing of leather according to claim 2, characterized in that: the driving mechanism (4) comprises a driving motor (41) fixedly connected to the rack (1) and a rotating rod (42) fixedly connected to the rotating drum (2), the rotating rod (42) is rotatably connected with the rack (1), and a transmission part (43) is arranged between the driving shaft of the driving motor (41) and the rotating rod (42); the transmission piece (43) is a transmission belt or gears meshed with each other.

5. A dyeing process for the uniform dyeing of leather according to claim 2, characterized in that: still be equipped with basin (7) sunken to frame (1) inside on frame (1), basin (7) are located rotary drum (2) under, still be equipped with between basin (7) and rotary drum (2) and be used for separating leather and dyeing liquor waterlogging caused by excessive rainfall subassembly (8), waterlogging caused by excessive rainfall subassembly (8) are pressed and are established on basin (7) lateral wall and cover in basin (7) top.

6. The dyeing process for uniformly dyeing leather according to claim 5, characterized in that: the draining assembly (8) comprises a draining plate (81), a plurality of draining holes (82) penetrating through the draining plate (81) are formed in the draining plate (81), the edge of the draining plate (81) is pressed on the side wall of the water tank (7), and the two ends of the draining plate (81) are attached to the rack (1).

7. The dyeing process for uniformly dyeing leather according to claim 6, characterized in that: each side wall of the water tank (7) is provided with at least one downward-sunken limiting groove (83), the limiting grooves (83) of the two opposite side walls are located at corresponding positions, a limiting lug (84) protrudes out of the side surface of the draining plate (81), and the limiting lug (84) is located in the limiting groove (83).

8. The dyeing process for uniformly dyeing leather according to claim 7, characterized in that: one end of the limiting lug (84), which is far away from the draining plate (81), extends out of the limiting groove (83); the thickness of spacing lug (84) is less than the degree of depth of spacing groove (83), draining plate (81) and the lateral wall of basin (7) enclose and close and form draining space (85), the draining space is located draining plate (81) top and is linked together through waterlogging caused by excessive rainfall hole (82) and basin (7).

9. A dyeing process for the uniform dyeing of leather according to claim 1, characterized in that: the coloring agent comprises, by mass, 10-30 parts of dye, 5-10 parts of acrylic acid, 5-15 parts of titanium dioxide, 3-8 parts of dibutyltin dilaurate and 2-6 parts of organic silicone oil; the auxiliary coloring agent comprises 6-12 parts by weight of cholesterol sulfate sodium salt, 1-5 parts by weight of sodium lignin sulfonate and 1-2 parts by weight of trimethylolpropane.

10. Dyeing process for the uniform dyeing of leather according to claim 9, characterized in that: the coloring agent comprises 20 parts by weight of dye, 7 parts by weight of acrylic acid, 10 parts by weight of titanium dioxide, 5 parts by weight of dibutyltin dilaurate and 4 parts by weight of organic silicone oil; the auxiliary coloring agent comprises 9 parts by weight of cholesterol sulfate sodium salt, 3 parts by weight of sodium lignin sulfonate and 1.5 parts by weight of trimethylolpropane.

Technical Field

The invention belongs to the technical field of leather dyeing, and particularly relates to a dyeing method for uniformly dyeing leather.

Background

Leather dyeing is a complex physicochemical process, which is the penetration and combination process of dye molecules to leather fibers, and is the total effect of physical and chemical actions. Throughout the dyeing process, adsorption, diffusion, permeation and fixation are interacting, alternating. The leather dyeing process has wide related aspects and a plurality of influencing factors, and can be mainly divided into factors such as equipment, dyeing materials, processes, operation and the like. However, the leather dyeing method used in the prior art has unsatisfactory dyeing uniformity of the dyed leather.

For example, the chinese invention patent application discloses a leather waterless dyeing method [ application No.: 201710390344.1, the patent application of the invention provides a leather waterless dyeing method, which is characterized by comprising the following specific steps: (1) placing the degreased leather blanks in a warehouse with the humidity of 85-90% and the temperature of 6-10 ℃ for 4-8 hours, and putting the leather blanks on a rack or directly laying the leather blanks on the ground without stacking the leather blanks together; (2) taking out the leather blanks in the warehouse, sending the leather blanks into a rolling machine for rolling treatment, vacuumizing once every 5-8 minutes during rolling, rolling for 5-10 minutes after vacuumizing each time, then vacuumizing, and circulating for 2-4 times; (3) putting the rolled and kneaded leather blank into a PEG-400 polyethylene glycol solution with the concentration of 30%, soaking for 60 minutes at normal temperature, taking out and hanging on a rack until no liquid drops; then paving the leather blank, fully spraying the pretreating agent by using a spray gun, standing for more than 80 minutes, and spraying the other side; (4) putting the leather blank into a dyeing reaction kettle for dyeing treatment, wherein the temperature in the dyeing kettle is 75-90 ℃, the pressure in the dyeing kettle is 15-22MPa, and the dyeing time is 20-60 minutes; (5) taking out the leather blank after dyeing, putting the leather blank into another reaction kettle, injecting steam into the reaction kettle, stopping injecting the steam when the steam temperature in the reaction kettle reaches 90-110 ℃, starting a stirring function simultaneously to heat the materials uniformly, stirring for 20-35 minutes, and then injecting water for cleaning; (6) and (3) placing the cleaned leather blank into a vacuum low-temperature cold air dryer, and drying at the temperature of 50-55 ℃ to obtain a finished product.

The application of the invention has the advantages of improving the production efficiency of leather dyeing and reducing the pollution of the leather dyeing process to the environment, but the invention still does not solve the problems.

Disclosure of Invention

The invention aims to solve the problems and provides a uniform dyeing method for leather with uniform dyeing.

In order to achieve the purpose, the invention adopts the following technical scheme:

a dyeing method for uniformly dyeing leather comprises the following steps:

the method comprises the following steps: mixing the coloring agent and the auxiliary coloring agent with water, stirring uniformly to form paste, adding water, and stirring uniformly to obtain a dyeing solution;

step two: adding the leather to be dyed into a dyeing mechanism, adding the dyeing solution prepared in the step one into the dyeing mechanism, heating the dyeing solution to 30-35 ℃, and driving the dyeing mechanism to rotate for dyeing for 1-2 hours;

step three: and heating to 50-55 ℃, driving a dyeing mechanism to rotate and dye for less than 15min, and obtaining the leather with uniform dyeing.

In the dyeing method for uniformly dyeing the leather, the dyeing mechanism comprises a rack and a rotary drum which is rotatably connected to the rack, a dyeing cavity is positioned in the rotary drum, one end of the rotary drum is in driving connection with the driving mechanism, the other end of the rotary drum is rotatably connected to the hollow supporting rod, the hollow supporting rod is fixedly connected with the rack, one end, far away from the rotary drum, of the hollow supporting rod is provided with a dynamic sampling assembly for obtaining dyeing liquid in the dyeing cavity, and the dynamic sampling assembly is communicated with the dyeing cavity through the hollow supporting rod.

In the dyeing method for uniformly dyeing leather, the dynamic sampling assembly comprises a main pipeline communicated with the dyeing cavity through the hollow support rod, a sampling pipeline communicated with the main pipeline, and a valve which is arranged on the sampling pipeline and can close or open the sampling pipeline; the one end that hollow support pole was kept away from to the trunk line extends to vertical ascending direction, the one end that the trunk line was kept away from to the sample pipeline extends to vertical decurrent direction.

In the dyeing method for uniformly dyeing the leather, the driving mechanism comprises a driving motor fixedly connected to the rack and a rotating rod fixedly connected to the rotating drum, the rotating rod is rotatably connected with the rack, and a transmission part is also arranged between a driving shaft of the driving motor and the rotating rod; the transmission piece is a transmission belt or gears meshed with each other.

In the dyeing method for uniformly dyeing the leather, the rack is also provided with a water tank which is sunken towards the inside of the rack, the water tank is positioned right below the rotary drum, a draining component for separating the leather from the dyeing liquor is also arranged between the water tank and the rotary drum, and the draining component is pressed on the side wall of the water tank and covers the upper part of the water tank.

In the dyeing method for uniformly dyeing leather, the draining component comprises a draining plate, a plurality of draining holes which are communicated with the draining plate are formed in the draining plate, the edge of the draining plate is pressed on the side wall of the water tank, and two ends of the draining plate are attached to the rack.

In the dyeing method for uniformly dyeing the leather, each side wall of the water tank is respectively provided with at least one limiting groove which is sunken downwards, the limiting grooves of the two opposite side walls are positioned at corresponding positions, the side surface of the draining plate is protruded with a limiting lug, and the limiting lug is positioned in the limiting groove.

In the dyeing method for uniformly dyeing the leather, one end of the limiting lug, which is far away from the draining board, extends out of the limiting groove; the thickness of spacing lug is less than the degree of depth of spacing groove, the lateral wall of waterlogging caused by excessive rainfall board and basin encloses to close and forms the waterlogging caused by excessive rainfall space, the waterlogging caused by excessive rainfall space is located the waterlogging caused by excessive rainfall board top and is linked together through waterlogging caused by excessive rainfall hole and basin.

In the dyeing method for uniformly dyeing the leather, the dyeing agent comprises 10-30 parts by weight of dye, 5-10 parts by weight of acrylic acid, 5-15 parts by weight of titanium dioxide, 3-8 parts by weight of dibutyltin dilaurate and 2-6 parts by weight of organic silicone oil; the auxiliary coloring agent comprises 6-12 parts by weight of cholesterol sulfate sodium salt, 1-5 parts by weight of sodium lignin sulfonate and 1-2 parts by weight of trimethylolpropane.

In the dyeing method for uniformly dyeing the leather, the dyeing agent comprises 20 parts of dye, 7 parts of acrylic acid, 10 parts of titanium dioxide, 5 parts of dibutyltin dilaurate and 4 parts of organic silicone oil in parts by mass; the auxiliary coloring agent comprises 9 parts by weight of cholesterol sulfate sodium salt, 3 parts by weight of sodium lignin sulfonate and 1.5 parts by weight of trimethylolpropane.

Compared with the prior art, the invention has the advantages that:

1. the dyeing liquid comprises the dyeing agent and the auxiliary dyeing agent, the auxiliary dyeing agent is attached to the surface of the leather at low temperature to prevent the surface of the leather from being dyed, the dyeing agent penetrates into the leather to realize dyeing penetration, and the auxiliary dyeing agent is separated from the surface of the leather at high temperature to realize the surface dyeing of the leather, so that the surface, the inside and the outside of the leather have better dyeing uniformity.

2. The dynamic sampling assembly is used for acquiring the dyeing liquid in the dyeing cavity and monitoring the concentration of the dyeing agent in the dyeing cavity in real time in the leather dyeing process, so that the dyeing agent can be supplemented in time to enable the concentration of the dyeing agent to be in an appropriate range, and the dyeing efficiency and the dyeing uniformity of the leather are guaranteed.

3. According to the leather draining device, the water tank and the draining assembly are arranged below the rotary drum, so that leather is drained conveniently, redundant dyeing liquid containing the dyeing agent is collected into the water tank, uniform treatment or recycling is facilitated, and the leather draining device is green and environment-friendly.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an enlarged view at A in FIG. 1;

FIG. 3 is a cross-sectional view of a portion of the structure of the present invention;

FIG. 4 is an exploded view of a portion of the structure of the present invention;

in the figure: the device comprises a rack 1, a rotary drum 2, a dyeing cavity 3, a driving mechanism 4, a hollow support rod 5, a dynamic sampling assembly 6, a water tank 7, a draining assembly 8, a driving motor 41, a rotating rod 42, a transmission piece 43, a main pipeline 61, a sampling pipeline 62, a valve 63, a draining plate 81, a draining hole 82, a limiting groove 83, a limiting bump 84, a draining space 85 and a dyeing mechanism 100.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.