阅读说明：本技术 一种龟裂重树脂压纹皮改色方法 (Color changing method for cracked heavy resin embossed leather ) 是由 雷丙南 林汉彬 陈启明 杨俊昇 于 2019-12-03 设计创作，主要内容包括：本发明公开了一种龟裂重树脂压纹皮改色方法,包括下列步骤：S1、将革坯加入转鼓中,将水加入转鼓中,控制水温为48～52℃,转动25～35min后排液；S2、再将水、乙二醇乙醚、脱脂剂、小苏打加入转鼓中,控制水温为48～52℃,继续转动110～130min后排液；S3、进行一次洗水,排液；S4、再将水、乙二醇乙醚、脱脂剂、小苏打加入转鼓中,控制水温为48～52℃,转动82～98min后排液；S5、进行二次洗水,排液。本发明的改色方法对于龟裂皮、重树脂皮、压纹皮具有良好的褪色效果,再次染色后的革坯色泽均匀饱满,耐曲折性能好,手感柔软,弹性好,质量品质高,与改色前相比,几乎不受影响。(The invention discloses a color changing method for a cracking heavy resin embossed leather, which comprises the following steps: s1, adding the leather blank into a rotary drum, adding water into the rotary drum, controlling the water temperature to be 48-52 ℃, rotating for 25-35 min, and discharging liquid; s2, adding water, ethylene glycol ethyl ether, a degreasing agent and baking soda into the rotary drum, controlling the water temperature to be 48-52 ℃, continuously rotating for 110-130 min, and discharging liquid; s3, washing for the first time and discharging liquid; s4, adding water, ethylene glycol ethyl ether, a degreasing agent and baking soda into the rotary drum, controlling the water temperature to be 48-52 ℃, rotating for 82-98 min, and discharging liquid; and S5, performing secondary washing and draining. The color changing method has good fading effect on cracked turtles, heavy resin skins and embossed skins, the leather blank dyed again is uniform and full in color, good in flexing resistance, soft in hand feeling, good in elasticity and high in quality, and is hardly influenced compared with the leather before color changing.)

1. A color changing method for a cracking heavy resin embossed leather is characterized by comprising the following steps:

s1, taking the stored leather as a leather blank, adding the leather blank into a rotary drum, adding 135-165% of water into the rotary drum according to the mass percent of the leather blank, controlling the water temperature to be 48-52 ℃, and discharging liquid after rotating for 25-35 min;

s2, adding 95-105% of water, 2.5-3.5% of ethylene glycol ethyl ether, 0.46-0.56% of degreasing agent and 0.45-0.55% of baking soda into a rotary drum according to the mass percentage of the leather blank, controlling the water temperature to be 48-52 ℃, and discharging liquid after continuously rotating for 110-130 min;

s3, washing the leather blank processed in the step S2 for the first time, and draining;

s4, adding 95-105% of water, 2.5-3.5% of ethylene glycol ethyl ether, 0.46-0.56% of degreasing agent and 0.45-0.55% of baking soda into a rotary drum according to the mass percentage of the leather blank, controlling the water temperature to be 48-52 ℃, and discharging liquid after rotating for 82-98 min;

and S5, performing secondary washing on the leather blank treated in the step S4, and draining.

2. The method of claim 1, further comprising the steps of:

s6, adding 1.8-2.2% of water-soluble dispersant and dye according to the mass percentage of the leather blank, adjusting the adding amount of the dye according to the color of the leather, rotating for 60-80 min, and carrying out primary dyeing;

s7, carrying out primary greasing and color fixing; then, taking out the drum, and sequentially pasting, hanging and grinding the plate and the leather; then returning to the drum, and sequentially carrying out secondary dyeing and secondary fatting and color fixing; and finally, discharging the leather from the drum, and sequentially carrying out drying, vibration softening, leather grinding and milling softening to obtain the color-changed leather product.

3. The method of claim 1, wherein in step S1, the stock skin is at least one of a tortoise shell, a heavy resin skin, and an embossed skin.

4. The method of claim 1, wherein in step S1, the stock skin is at least one of crazing-head-layer cowhide, polyurethane leather, and polyurethane embossed leather.

5. The method of claim 1, wherein in step S1, the stock leather is used as a leather blank, the leather blank is added into a rotating drum, 150% of water is added into the rotating drum according to the mass percentage of the leather blank, the water temperature is controlled to be 50 ℃, and the liquid is discharged after rotating for 30 min.

6. The method of claim 1, wherein in step S2, 100% of water, 3% of ethylene glycol ethyl ether, 0.5% of degreasing agent and 0.5% of baking soda are added into the rotary drum according to the mass percentage of the leather blank, the water temperature is controlled at 50 ℃, and the liquid is discharged after rotating for 120 min.

7. The method of claim 1, wherein in step S4, 100% water, 3% ethylene glycol ethyl ether, 0.5% degreasing agent and 0.5% baking soda are added into the rotary drum according to the weight percentage of the leather blank, the water temperature is controlled at 50 ℃, and the liquid is discharged after rotating for 90 min.

8. The method of claim 1, wherein in step S3, the primary wash water is: according to the mass percentage of the leather blank, 300% of water is added into the rotary drum, the water temperature is controlled to be 26-28 ℃, and the liquid is discharged after the rotary drum rotates for 10 min.

9. The method of claim 1, wherein in step S5, the secondary washing water is: firstly, adding 300% of water into a rotary drum according to the mass percentage of a leather blank, controlling the water temperature to be 26-28 ℃, and discharging liquid after rotating for 10 min; and then adding 200% of water into the rotary drum according to the mass percentage of the leather blank, controlling the water temperature to be 26-28 ℃, and discharging the liquid after rotating for 10 min.

Technical Field

The invention relates to the technical field of leather treatment, in particular to a color changing method for a cracking heavy resin embossed leather.

Background

Generally, a large leather production company (manufacturer) has a lot of special products, such as cracked turtle skins, heavy resin skins, embossed skins and other stock skins, and the leathers can be reused after being treated, so that economic benefits are maximized.

In order to eliminate the stock and to achieve a graceful response to market changes or to recycle defective products, dyed leather blanks must be reprocessed to be returned to the market. The first problem that arises at this point is the need for a good bleaching treatment of the semifinished leather blanks. The traditional fading process is rarely adopted by leather-making enterprises due to the defects of high cost, complex operation, great influence on the quality of finished leather and the like.

The workshop section which determines the leather style in the leather-making production process is a wet finishing workshop section, and the color-changing process can restore the state of the leather blank to be before the dyeing process, so that the production process can be changed from irreversible to reversible without newly adding equipment or adjusting the layout of a workshop, remedial measures are provided for production, the loss caused by the change of a production plan can be reduced to the minimum, and the flexibility and the safety of enterprise operation are greatly improved.

However, the currently used method for changing the color of the cracked heavy resin embossed leather has the following problems:

1. the fading degree of the cracked turtle shell, the heavy resin shell and the embossed leather is low, and the performances of the leather blank after secondary dyeing, such as uneven color, hand feeling and the like, are greatly reduced;

2. after the color changing treatment is carried out on the cracked turtles, the heavy resin skins and the embossed skins, the fiber structure of the leather product is damaged to a certain degree, so that the physical and mechanical performance indexes of the leather product are greatly reduced compared with those before the color changing treatment;

3. chemical raw materials such as a processor and the like used in the process steps are not friendly to the environment and human bodies, and secondary pollution is caused;

4. the process steps are complex, the operation is inconvenient, the cost is high, and the popularization and the application are not facilitated.

Disclosure of Invention

In view of the above circumstances, an object of the present invention is to provide a method for changing the color of a cracked heavy resin embossed skin, which can effectively solve the above problems.

In order to solve the technical problems, the technical scheme provided by the invention is as follows:

a method for changing color of a cracking heavy resin embossed leather comprises the following steps:

s1, taking the stored leather as a leather blank, adding the leather blank into a rotary drum, adding 135-165% of water into the rotary drum according to the mass percent of the leather blank, controlling the water temperature to be 48-52 ℃, and discharging liquid after rotating for 25-35 min;

s2, adding 95-105% of water, 2.5-3.5% of ethylene glycol ethyl ether, 0.46-0.56% of degreasing agent and 0.45-0.55% of baking soda into a rotary drum according to the mass percentage of the leather blank, controlling the water temperature to be 48-52 ℃, and discharging liquid after continuously rotating for 110-130 min;

s3, washing the leather blank processed in the step S2 for the first time, and draining;

s4, adding 95-105% of water, 2.5-3.5% of ethylene glycol ethyl ether, 0.46-0.56% of degreasing agent and 0.45-0.55% of baking soda into a rotary drum according to the mass percentage of the leather blank, controlling the water temperature to be 48-52 ℃, and discharging liquid after rotating for 82-98 min;

and S5, performing secondary washing on the leather blank treated in the step S4, and draining.

Preferably, the method further comprises the following steps:

s6, adding 1.8-2.2% of water-soluble dispersant and dye according to the mass percentage of the leather blank, adjusting the adding amount of the dye according to the color of the leather, rotating for 60-80 min, and carrying out primary dyeing;

s7, carrying out primary greasing and color fixing; then, taking out the drum, and sequentially pasting, hanging and grinding the plate and the leather; then returning to the drum, and sequentially carrying out secondary dyeing and secondary fatting and color fixing; and finally, discharging the leather from the drum, and sequentially carrying out drying, vibration softening, leather grinding and milling softening to obtain the color-changed leather product.

Preferably, in step S1, the stock skin is at least one of a chapped skin, a heavy resin skin and an embossed skin.

Among them, split tortoise skins (e.g., split-head cowhide), heavy resin (e.g., polyurethane leather) skins, and embossed skins (e.g., polyurethane embossed leather).

Preferably, in step S1, the stock skin is at least one of a crazing head layer leather, a polyurethane leather, and a polyurethane embossed leather.

Preferably, in step S1, the stocked leather is used as a leather blank, the leather blank is added into the rotating drum, 150% of water is added into the rotating drum according to the mass percentage of the leather blank, the water temperature is controlled to be 50 ℃, and the liquid is discharged after the rotating drum rotates for 30 min.

Preferably, in step S2, 100% of water, 3% of ethylene glycol ethyl ether, 0.5% of degreasing agent and 0.5% of baking soda are added into the rotary drum according to the mass percentage of the leather blank, the water temperature is controlled at 50 ℃, and the liquid is discharged after rotating for 120 min.

Preferably, in step S4, 100% of water, 3% of ethylene glycol ethyl ether, 0.5% of degreasing agent and 0.5% of baking soda are added into the rotary drum according to the mass percentage of the leather blank, the water temperature is controlled at 50 ℃, and the liquid is discharged after rotating for 90 min.

Preferably, in step S3, the primary washing water is: according to the mass percentage of the leather blank, 300% of water is added into the rotary drum, the water temperature is controlled to be 26-28 ℃, and the liquid is discharged after the rotary drum rotates for 10 min.

Preferably, in step S5, the secondary washing water is: firstly, adding 300% of water into a rotary drum according to the mass percentage of a leather blank, controlling the water temperature to be 26-28 ℃, and discharging liquid after rotating for 10 min; and then adding 200% of water into the rotary drum according to the mass percentage of the leather blank, controlling the water temperature to be 26-28 ℃, and discharging the liquid after rotating for 10 min.

Compared with the prior art, the invention has the following advantages and beneficial effects:

the method for changing the color of the cracked heavy resin embossed leather provided by the invention has the advantages that the sequence of the process (method) steps of the color changing treatment is reasonably controlled, and the process condition parameters of each step are strictly controlled (the control of the process condition parameters is the key for obtaining a good color changing effect, and the good color changing effect can be ensured only if the process condition parameters are controlled within a proper range); the cracking heavy resin embossed leather color changing method has the advantages that the bending resistance is good, the hand feeling is soft, the elasticity is good, the quality is high, compared with the leather before color changing, the hand feeling and other properties are kept good and are hardly influenced, and the fiber structure of the leather product prepared by the cracking heavy resin embossed leather color changing method is not damaged, so that the physical and mechanical property indexes of the leather product are almost kept unchanged.

In the method for changing the color of the cracking heavy resin embossed leather, water, ethylene glycol ethyl ether, a degreasing agent and baking soda are adopted for twice treatment, and the technological condition parameters of corresponding steps are strictly controlled, so that a good color-changing effect is ensured.

The chemical raw materials such as the processor and the like used in the technical steps of the cracking heavy resin embossed leather color changing method are less in consumption, are all water-soluble, are environment-friendly and human-friendly, and effectively avoid secondary pollution.

The color changing method of the cracking heavy resin embossed leather has the advantages of simple process steps, convenient operation, production cost saving and good popularization and application prospect.

Detailed Description

In order that those skilled in the art will better understand the technical solutions of the present invention, the following description of the preferred embodiments of the present invention is provided in connection with specific examples, which should not be construed as limiting the present patent.

The test methods or test methods described in the following examples are conventional methods unless otherwise specified; the reagents and materials, unless otherwise indicated, are conventionally obtained commercially or prepared by conventional methods.