CN113308588A - Production method for improving pull-type tear strength of leather of steering wheel of head layer - Google Patents
Production method for improving pull-type tear strength of leather of steering wheel of head layer Download PDFInfo
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- CN113308588A CN113308588A CN202110538242.6A CN202110538242A CN113308588A CN 113308588 A CN113308588 A CN 113308588A CN 202110538242 A CN202110538242 A CN 202110538242A CN 113308588 A CN113308588 A CN 113308588A
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- C—CHEMISTRY; METALLURGY
- C14—SKINS; HIDES; PELTS; LEATHER
- C14C—CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
- C14C3/00—Tanning; Compositions for tanning
- C14C3/02—Chemical tanning
- C14C3/04—Mineral tanning
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- C—CHEMISTRY; METALLURGY
- C14—SKINS; HIDES; PELTS; LEATHER
- C14C—CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
- C14C3/00—Tanning; Compositions for tanning
- C14C3/02—Chemical tanning
- C14C3/08—Chemical tanning by organic agents
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- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment And Processing Of Natural Fur Or Leather (AREA)
Abstract
The invention discloses a production method for improving the leather pants type tearing strength of a steering wheel of a head layer, which comprises the following steps: rewetting, retanning, neutralizing, filling and dyeing, fatliquoring and fixing, wherein a degreasing agent, formic acid, a rewetting agent and water are added in the rewetting step; adding water, a compound fatting agent, chromium powder and sodium formate in the retanning step; adding neutralized tannin, sodium formate and baking soda in the neutralization step; adding water, acrylic acid, a synthetic tanning agent and dye in the filling and dyeing step; adding water, a plant fatting agent, a compound fatting agent and a protein filler in the step of fatting; in the color fixing step, formic acid is sequentially added at regular intervals, and water, a color fixing agent and formic acid are added after water is drained. According to the invention, the synthetic tanning agent is used for replacing a vegetable tanning agent, and parameter control such as feeding sequence, temperature control and PH value control is matched, so that the trouser tearing strength of the leather embryo is obviously improved. The invention is suitable for specially producing leather with higher requirements on trouser tear strength, such as steering wheel leather and the like.
Description
Technical Field
The invention belongs to the technical field of leather, and particularly relates to a production method for improving the leather pants type tearing strength of a steering wheel of a top layer.
Background
The tanning technology is developed to date, and the vegetable tanning agent can be one of chemical materials which are necessarily used when a retanning dyeing process is established. The plant tanning agent is also called tannin extract, and the tannin extract is a chemical product prepared by processing plant raw materials rich in tannin through the steps of water extraction, concentration and the like. The vegetable tanning agent can form hydrogen bond combination with collagen of cow leather, so that the leather has the characteristics of pressure resistance, good rebound resilience and the like when being made into leather. The vegetable tanning agent is also an essential material in the manufacturing process of automobile leather and is also frequently used for manufacturing automobile seat leather and steering wheel leather. The index of the trouser tear strength of the leather for the steering wheel of the automobile is very important, and if the trouser tear strength is poor, the tearing phenomenon can occur when the leather of the steering wheel is wrapped and sewed on the steering wheel after being cut. This is because the vegetable tanning agent becomes hard and brittle in a dry state, which affects the pull-up tear strength, and therefore, it is necessary to design a new method for producing steering wheel leather, which can improve the pull-up tear strength, in response to the problem of the pull-up tear strength of the steering wheel leather.
Disclosure of Invention
In order to solve the technical problems, the invention adopts the technical scheme that: a production method for improving the trouser tear strength of the leather of a steering wheel of a headboard comprises the following steps in a rotary drum: rewetting, retanning, neutralizing, filling and dyeing, fatliquoring and fixing, wherein in the rewetting step, 0.1-0.2 part of degreasing agent, 0.2-04 parts of formic acid, 0.1-0.2 part of rewetting agent and 200-220 parts of water are added into a rotary drum; in the retanning step, 150-180 parts of water, 1-2 parts of compound fatting agent, 3-5 parts of chromium powder and 1-3 parts of sodium formate are added into a rotary drum; in the neutralization step, 1-3 parts of neutralized tannin, 1-3 parts of sodium formate and 0.5-1.0 part of baking soda are added into a rotary drum; in the filling and dyeing step, 100-120 parts of water, 2-4 parts of acrylic acid, 5-6 parts of synthetic tanning agent and 2-3 parts of dye are added into a rotary drum; in the step of greasing, 100-110 parts of water, 2-4 parts of plant greasing agent, 5-6 parts of compound greasing agent and 2-4 parts of protein filler are added into a rotary drum; in the color fixing step, 1.0-1.5 parts of formic acid is sequentially added into the rotary drum at regular intervals, and after water is drained, 320 parts of water, 0.5-1.0 part of color fixing agent and 0.5-1.0 part of formic acid are added.
Preferably, in the rewetting step, water with the temperature of 50-55 ℃ is added, the drum temperature is controlled to be 50 +/-2 ℃, and the rewetting time is 60 minutes.
Preferably, in the retanning, neutralizing and filling dyeing process, the water temperature is 30-35 ℃, the drum temperature is controlled to be 50 +/-2 ℃, water, the compound additive, the chromium powder and the sodium formate are sequentially added in the retanning process, the drum rotates for 10 minutes after the compound additive is added, then the chromium powder is added, the drum rotates for 60 minutes, finally the sodium formate is added, the drum rotates for 60 minutes, the drum stops to rotate for overnight, and water is drained the next day.
Preferably, in the neutralizing step, water, the neutralized tannin, sodium formate and baking soda are sequentially added, wherein the drum rotates for 30 minutes after the sodium formate is added, then the baking soda drum rotates for 60 minutes, and finally, water is discharged, and the pH value in the drum is controlled to be 4.5 +/-0.2.
Preferably, in the filling and dyeing step, 300 parts of water is added, the drum rotates for 10 minutes and then is drained, then 120 parts of water is added, acrylic acid, the synthetic tanning agent and the dye are sequentially added, the drum rotates for 30 minutes after the acrylic acid is added, then the synthetic tanning agent is added, and the drum rotates for 90 minutes after the dye is added.
Preferably, in the step of fatliquoring, water, the plant fatting agent, the compound fatting agent and the protein filler are added in sequence, and the rotary drum rotates for 45 minutes after the protein filler is added.
Preferably, in the color fixing step, formic acid is added in three times, the drum rotates for 10 minutes after the formic acid is added for the first time, then formic acid is added for the second time, the drum rotates for 20 minutes, then formic acid is added for the third time, the drum rotates for 30 minutes, the pH value in the drum is controlled to be 3.4 +/-0.2, water is drained, 300 parts of water with the temperature of 40 ℃ is added, then the color fixing agent and the formic acid are sequentially added, water is drained after the drum rotates for 20 minutes, finally 300 parts of normal temperature water is added, the drum rotates for 10 minutes, the leather is taken out, water is squeezed under the vacuum condition with the temperature of 50 ℃, the leather is stretched for 200 seconds, and the leather is dried.
The invention has the beneficial effects that: according to the invention, the synthetic tanning agent is used for replacing a vegetable tanning agent, and parameter control such as feeding sequence, temperature control and PH value control is matched, so that the trouser tearing strength of the leather embryo is obviously improved. The invention is suitable for specially producing leather with higher requirements on trouser tear strength, such as steering wheel leather and the like.
Detailed Description
The technical solutions of the present invention will be described clearly and completely below, and it should be apparent that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
A piece of blue leather is separated along the ridge line, half pieces of leather are manufactured by the original process flow, and half pieces of leather are produced by the process flow of the embodiment 1.
Example 1
A production method for improving the trouser tear strength of the leather of a steering wheel of a headboard comprises the following steps in a rotary drum: the method comprises the following steps of rewetting, retanning, neutralizing, filling and dyeing, fatliquoring and color fixing, wherein in the rewetting step, 0.1 part of degreasing agent, 0.3 part of formic acid, 0.1 part of rewetting agent and 200 parts of water are added into a rotary drum, the water temperature is 50-55 ℃, the temperature of the rotary drum is controlled to be 50 +/-2 ℃, and the rewetting time is 60 minutes. In the retanning step, 150 parts of water with the water temperature of 35 ℃ is added into a rotary drum, the temperature of the rotary drum is controlled to be 50 +/-2 ℃, 1 part of compound fatting agent, 3 parts of chromium powder and 2 parts of sodium formate are sequentially added, the rotary drum rotates for 10 minutes after the compound fatting agent is added, then the chromium powder is added, the rotary drum rotates for 60 minutes, finally the sodium formate is added, the rotary drum rotates for 60 minutes, the drum stops to be used for overnight, and water is drained the next day. In the neutralization step, 150 parts of water with the temperature of 35 ℃, 2 parts of neutralized tannin, 2 parts of sodium formate and 0.6 part of baking soda are sequentially added, wherein the drum rotates for 30 minutes after the sodium formate is added, then the baking soda drum rotates for 60 minutes, finally, water is discharged, and the pH value in the drum is controlled to be 4.5 +/-0.2. In the filling and dyeing step, 300 parts of 35 ℃ water is added into a rotary drum, the rotary drum is drained after rotating for 10 minutes, 120 parts of 35 ℃ water, 3 parts of acrylic acid, 5 parts of synthetic tanning agent and 2.5 parts of dye are added, the temperature in the rotary drum is controlled to be 35 +/-2 ℃, the synthetic tanning agent is added after the acrylic acid is added and the rotary drum rotates for 30 minutes, and the rotary drum rotates for 90 minutes after the dye is added. In the step of greasing, 100 parts of water with the temperature of 35 ℃, 3 parts of plant greasing agent, 6 parts of compound greasing agent and 3 parts of protein filler are added into a rotary drum, the temperature in the rotary drum is controlled to be 48 +/-2 ℃, and the rotary drum rotates for 45 minutes after the protein filler is added; in the color fixing step, formic acid is added in three times, 1.0 part of formic acid is added each time, the drum rotates for 10 minutes after the formic acid is added for the first time, then formic acid is added for the second time, the drum rotates for 20 minutes, then formic acid is added for the third time, the drum rotates for 30 minutes, the PH value is controlled within 3.4 +/-0.2 in the drum, water is drained, 300 parts of water with the temperature of 40 ℃ is added, then a color fixing agent and the formic acid are sequentially added, water is drained after the drum rotates for 20 minutes, finally 300 parts of normal temperature water is added, the drum rotates for 10 minutes, the leather is taken out, water is squeezed under the vacuum condition with the temperature of 50 ℃, the leather is stretched for 200 seconds, and the leather is dried. The rest of the processing steps are the same as the original production process.
The same dry finishing method was used for the skin blanks produced in the original process flow as for the skin blanks produced in example 1, and the pant-type tear strength test results of the obtained skin blanks were as follows according to the test method of E0305788.5:
from the experimental results, the trouser tear strength of the leather embryo is improved by nearly 50% by combining with new production processes such as temperature and PH control and the like after the vegetable tanning agent is replaced by the synthetic tanning agent, and the effect is obvious.
It should be noted that the technical features of the protein filler, the plant fat-liquoring agent, the compound fat-liquoring agent and the like related to the present patent application should be regarded as the prior art, the specific structure, the working principle, the control mode and the spatial arrangement mode of the technical features may be conventional in the art, and should not be regarded as the invention point of the present patent, and the present patent is not further specifically described in detail.
Having described preferred embodiments of the present invention in detail, it is to be understood that modifications and variations may be resorted to without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A production method for improving the trouser tear strength of the leather of a steering wheel of a headboard comprises the following steps in a rotary drum: rewetting, retanning, neutralizing, filling and dyeing, fatliquoring and fixing, which is characterized in that in the rewetting step, 0.1-0.2 part of degreasing agent, 0.2-04 parts of formic acid, 0.1-0.2 part of rewetting agent and 200-220 parts of water are added into a rotary drum; in the retanning step, 150-180 parts of water, 1-2 parts of compound fatting agent, 3-5 parts of chromium powder and 1-3 parts of sodium formate are added into a rotary drum; in the neutralization step, 1-3 parts of neutralized tannin, 1-3 parts of sodium formate and 0.5-1.0 part of baking soda are added into a rotary drum; in the filling and dyeing step, 100-120 parts of water, 2-4 parts of acrylic acid, 5-6 parts of synthetic tanning agent and 2-3 parts of dye are added into a rotary drum; in the step of greasing, 100-110 parts of water, 2-4 parts of plant greasing agent, 5-6 parts of compound greasing agent and 2-4 parts of protein filler are added into a rotary drum; in the color fixing step, 1.0-1.5 parts of formic acid is sequentially added into the rotary drum at regular intervals, and after water is drained, 320 parts of water, 0.5-1.0 part of color fixing agent and 0.5-1.0 part of formic acid are added.
2. The method for producing a steering wheel leather pant-type tear strength according to claim 1, wherein in the rewetting step, water is added at a temperature of 50 to 55 ℃ and the drum temperature is controlled at 50 ± 2 ℃ for a rewetting time of 60 minutes.
3. The method for improving the pull-type tear strength of the leather of the steering wheel on the top layer as claimed in claim 1, wherein the water temperature during the retanning, neutralizing, filling and dyeing is 30-35 ℃ and the drum temperature is controlled to be 50 ± 2 ℃, water, the compound additive, the chromium powder and the sodium formate are sequentially added during the retanning, the drum rotates for 10 minutes after the compound additive is added, then the chromium powder is added, the drum rotates for 60 minutes, finally the sodium formate is added, the drum rotates for 60 minutes, the drum stops rotating for overnight, and the next day is drained.
4. A method of producing a steering wheel leather with improved pull-up tear strength as claimed in claim 3 wherein the neutralization step comprises adding water, neutralized tannin, sodium formate and sodium bicarbonate sequentially, wherein the drum is rotated for 30 minutes after the sodium formate is added, then the drum is rotated for 60 minutes after the sodium bicarbonate is added, and finally the drum is drained, wherein the PH of the drum is controlled to be 4.5 ± 0.2.
5. The method for producing a steering wheel leather with improved pants-type tear strength as claimed in claim 4, wherein the filling and dyeing step comprises adding 300 parts of water, draining after the drum rotates for 10 minutes, adding 120 parts of water, sequentially adding acrylic acid, syntan and dye, adding acrylic acid and syntan after the drum rotates for 30 minutes, and adding dye and then rotating the drum for 90 minutes.
6. The method for producing a steering wheel leather with improved pants-type tear strength as claimed in claim 5, wherein the step of fatliquoring comprises adding water, vegetable fat-liquoring agent, fat-liquoring complex agent and protein filler in sequence, and rotating the drum for 45 minutes after the protein filler is added.
7. The method for producing a steering wheel leather with improved pants-type tear strength as claimed in claim 6, wherein in the fixing step, formic acid is added in three times, the drum is rotated for 10 minutes after the formic acid is added for the first time, then formic acid is added for the second time, the drum is rotated for 20 minutes, then formic acid is added for the third time, the drum is rotated for 30 minutes, the pH value in the drum is controlled to be 3.4 ± 0.2, water is drained, 300 parts of water at 40 ℃ is added, then the fixing agent and the formic acid are sequentially added, water is drained after the drum is rotated for 20 minutes, finally 300 parts of normal temperature water is added, the drum is rotated for 10 minutes, the leather is taken out, water squeezing and stretching are carried out for 200 seconds under a vacuum condition at 50 ℃, and the leather is dried.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110538242.6A CN113308588A (en) | 2021-05-18 | 2021-05-18 | Production method for improving pull-type tear strength of leather of steering wheel of head layer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110538242.6A CN113308588A (en) | 2021-05-18 | 2021-05-18 | Production method for improving pull-type tear strength of leather of steering wheel of head layer |
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| Publication Number | Publication Date |
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| CN113308588A true CN113308588A (en) | 2021-08-27 |
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| CN202110538242.6A Pending CN113308588A (en) | 2021-05-18 | 2021-05-18 | Production method for improving pull-type tear strength of leather of steering wheel of head layer |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102517409A (en) * | 2011-11-28 | 2012-06-27 | 郑州科信化工有限公司 | Leather retanning method |
| CN105238889A (en) * | 2015-09-30 | 2016-01-13 | 兴业皮革科技股份有限公司 | High-temperature and low-temperature alternate retanning type dyeing technique |
| CN105624343A (en) * | 2016-03-29 | 2016-06-01 | 兴业皮革科技股份有限公司 | Production technique for improving tearing strength of nappa shoe upper leather |
-
2021
- 2021-05-18 CN CN202110538242.6A patent/CN113308588A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102517409A (en) * | 2011-11-28 | 2012-06-27 | 郑州科信化工有限公司 | Leather retanning method |
| CN105238889A (en) * | 2015-09-30 | 2016-01-13 | 兴业皮革科技股份有限公司 | High-temperature and low-temperature alternate retanning type dyeing technique |
| CN105624343A (en) * | 2016-03-29 | 2016-06-01 | 兴业皮革科技股份有限公司 | Production technique for improving tearing strength of nappa shoe upper leather |
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Application publication date: 20210827 |