CN110106295A - A kind of leather retanning method and the crust leather using its preparation - Google Patents
A kind of leather retanning method and the crust leather using its preparation Download PDFInfo
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- CN110106295A CN110106295A CN201910465595.0A CN201910465595A CN110106295A CN 110106295 A CN110106295 A CN 110106295A CN 201910465595 A CN201910465595 A CN 201910465595A CN 110106295 A CN110106295 A CN 110106295A
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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
- C14C3/10—Vegetable tanning
- C14C3/12—Vegetable tanning using purified or modified vegetable tanning agents
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Abstract
The invention discloses a kind of leather retanning methods, pass through return water, washing, retanning and stuffing and etc., finally prepare crust leather, retanning is carried out using almond peel tannin extract in retanning step, the crust leather leather body consolidation prepared, grain is full, color is shallower, tensile strength and tearing strength are above the crust leather using BA tannin extract retanning, simultaneously, the crust leather that a little higher than BA tannin extract of the shrinkage temperature of crust leather prepared by the present invention is prepared, and it thickens rate and is then significantly larger than the crust leather that BA tannin extract is prepared, show that almond peel tannin extract can enter inside crust leather well, multiple spot crosslinking occurs with collagenous fibres, to make the performance of crust leather be promoted.
Description
Technical field
The present invention relates to leather retanning technical field, in particular to a kind of leather retanning method and the base using its preparation
Leather.
Background technique
China is the big country of leather production, and there are about 10 leather and fur products to originate in China in the whole world.Leather industry is for I
State brings good economic benefit, while also resulting in certain environmental pollution.Since chrome leather is with soft, plentiful, resistance to
The high excellent performance such as damp and hot, chrome tanning is occupied an leading position in main tan and retanning at present.But in chrome tanning process, there are a large amount of trivalent chromiums
It is not absorbed and just emits, environment is caused centainly to pollute.In recent years, as the development of economic globalization and people are to environment
The increasingly promotion of protective awareness, more and more process hides people have turned one's attention to vegetable tanning agent.
Vegetable tanning agent is one kind with tannin tannin extract as main component, and applicating history in the leather is long.It is extracted
In the plant of nature, have the advantages that green, pollution-free, environmentally friendly.In addition, the leather after vegetable tanning agent retanning possesses leather body
The feature that consolidation, grain are full, ductility is small.The BA tannin extract generally used at present, the crust leather performance that retanning goes out need to be mentioned
Height, so, developing novel retanning Technology is the hot spot of leather industry and the trend of Green Sustainable.
Summary of the invention
One of the objects of the present invention is to provide a kind of leather retanning methods, carry out retanning, preparation using almond peel tannin extract
Leather body consolidation, the grain of crust leather out are full, and color is shallower, superior performance.
The second object of the present invention be to provide the crust leather that leather retanning method is prepared, tensile strength and tearing strength and
The rate of thickening is above the crust leather using BA tannin extract retanning.
It is to be achieved through the following technical solutions for the present invention:
A kind of leather retanning method, comprising the following steps:
(1) it draws materials: getting out wet blue leather, water, degreasing agent, neutralizer, lye, almond peel tannin extract, fatting agent and acid solution,
Middle water, degreasing agent, neutralizer, lye, almond peel tannin extract, fatting agent and acid solution dosage on the basis of the weight of wet blue leather；
(2) return water: wet blue leather is added to the water, and degreasing agent is added, and liquid is discharged after adjusting temperature；
(3) it washes: continuously adding water, liquid is discharged after adjusting temperature；
(4) it neutralizes: continuously adding water, then adjust pH value to 5~6, liquid is discharged after adjusting temperature；
(5) it washes: continuously adding water, liquid is discharged after adjusting temperature；
(6) retanning: continuously adding the water of 90~150wt%, adds the almond peel tannin extract of 2~3wt%, adjusts temperature and is
25~40 DEG C, the almond peel tannin extract of 3~4wt% of addition after 20~30min is rotated, 4~5wt% is added after rotating 30~40min
Almond peel tannin extract, rotate 40~50min after liquid is discharged；
(7) it washes: continuously adding water, liquid is discharged after adjusting temperature；
(8) stuffing: continuously adding water, and fatting agent be added, and after adjusting temperature, adjusts pH value to 3~4；
(9) go out to rouse: skin being taken out, is dried, crust leather is obtained.
Further, the preparation process of almond peel tannin extract described in step (6) specifically:
It (6.1) is that 1:10~1:20 weighs almond peel powder and ethanol solution according to solid-to-liquid ratio, by almond peel powder and second
Alcoholic solution mixing, obtains mixed liquor；
(6.2) mixed liquor is heated to 1~2h at 60~90 DEG C, then filters, be concentrated, obtain crude extract；
(6.3) crude extract is purified, obtains almond peel tannin extract.
Further, in step (6.3), crude extract is purified specifically:
Crude extract is configured to the sample liquid that concentration is 0.80~1.60mg/mL, with the loading flow velocity of 0.5~1BV/h, big
The sample liquid that 3~5BV is added in the resin column of hole is adsorbed, and the water elution pillar of 2BV is added, is then carried out with 70% ethanol solution
Desorption, by the dry concentration of stripping liquid.
Further, the almond peel powder comes from almond processing industry waste.
Further, the return water of step (2) specifically: wet blue leather is placed in rotary drum, be added 150~350wt% water and
The degreasing agent of 0.5~2wt%, adjusting temperature is 20~35 DEG C, and liquid is discharged after rotating 20~50min；
The washing of step (3) specifically: the water of 200~350wt% is added in rotary drum, adjusting temperature is 20~35 DEG C,
Liquid is discharged after 10~30min of rotation；
The washing of step (5) and step (7) specifically: the water of 200~300wt% is added in rotary drum, adjusting temperature is
25~40 DEG C, liquid is discharged after rotating 10~20min.
Further, the neutralization of step (4) specifically: the water of 100~200wt% is added in rotary drum, then add 1~
The neutralizer of 3wt% and the lye of 0.5~2wt%, adjusting pH value to 5~6, adjusting temperature is 25~40 DEG C, rotation 150~
Liquid is discharged after 200min.
Further, lye is sodium bicarbonate, sodium formate or sodium acetate.
Further, the stuffing of step (8) specifically: the water and 10~20wt% of 90~150wt% are added in rotary drum
Fatting agent, adjusting temperature is 30~55 DEG C, and the acid solution of 1~2wt% is added after 30~90min of rotation in rotary drum, adjusts pH value
To 3~4, it is rotated further by 30~60min.
Further, acid solution is formic acid, oxalic acid or citric acid.
The invention also discloses the crust leathers prepared using the leather retanning method.
Compared with prior art, the invention has the following beneficial technical effects:
The invention discloses a kind of leather retanning method, by return water, washing, retanning and stuffing and etc., it is final to prepare
Crust leather out carries out retanning using almond peel tannin extract in retanning step, and almond peel tannin extract is added three times, and dosage gradually increases,
This operation is conducive to almond peel tannin extract effective component and penetrates into inside collagen, avoids the occurrence of the phenomenon that tan is crossed on surface；It is added de-
Rouge agent can remove the dirt on wet blue leather surface and the bloom of leather surface, so that subsequent step preferably carries out；It is neutralized before retanning
Step can remove the free acid in leather body, and the charge for removing from office surface is adjusted, to control leather to the affine of almond peel tannin extract
Power.
Further, almond peel is mixed with ethanol solution, by heating, filtering and purifying, obtains almond peel tannin extract.Heating
Temperature range can not only accelerate tannin Fast Stripping at 60~90 DEG C, at a temperature of this but also will not destroy tannin structure；It extracts
Solvent is ethanol solution, and the hydrogen bond that this solution can be preferably broken in plant is to make almond peel tannin effectively dissolve out.It utilizes
Effective component can solve the worries that enterprise's waste nowhere disposes preparing plant retanning agent not only in almond peel, but also meet
The demand of current leather industry Green Sustainable, preparation method is simple, and raw material cost is low.
Further, purification process uses HP-20 macroporous absorbent resin, which is more suitable for absorbing tannin, and using common
Organic solvent, can dissociate adsorbent out.
Further, almond peel powder comes from trade waste, not can cause environmental pollution, moreover it is possible to effective in waste
Ingredient develops and utilizes, and meets very much China's green sustainable development theory.
The invention also discloses the crust leather using the preparation of above-mentioned leather retanning method, leather body consolidation, the grain of the crust leather are full
Full, color is shallower, and tensile strength and tearing strength are above the crust leather using BA tannin extract retanning, meanwhile, base prepared by the present invention
The crust leather that a little higher than BA tannin extract of the shrinkage temperature of leather is prepared, and thicken rate and be then significantly larger than the crust leather that BA tannin extract is prepared, table
Bright almond peel tannin extract can enter inside crust leather well, multiple spot crosslinking occur with collagenous fibres, so that the performance of crust leather be made to add
To be promoted.
Detailed description of the invention
Fig. 1 is that the quantitative measurement result of the crust leather in all embodiments of the invention and comparative example 1 after retanning compares column
Shape figure.
Fig. 2 is the crust leather optics picture after 1 retanning of all embodiments of the invention and comparative example.
Specific embodiment
Below with reference to specific embodiment, the present invention is described in further detail, it is described be explanation of the invention and
It is not to limit.
From Sichuan DeSaiEr chemical engineering Industry Co., Ltd, model is divided for fatting agent used in the present invention, neutralizer buying
It Wei not DN, NT；Used degreasing agent is purchased from this tal fibre Chemical Co., Ltd., model LQ-5；Used BA tannin extract is adopted
Purchased from Baise of Guangxi woodsization head factory.
Embodiment 1
A kind of leather retanning method of the invention, specifically includes the following steps:
(1) it draws materials: sheep dress ornament wet blue leather being taken to weigh, the reagent dosage in subsequent step is with the percentage table of the weight
Show.
(2) return water: wet blue leather is placed in rotary drum, the water of 200wt% is added, the degreasing agent DT of 1wt%, adjusting temperature is
25 DEG C, liquid is discharged after rotating 30min.
(3) it washes: the water of 200wt% being added in rotary drum, adjusting temperature is 25 DEG C, and liquid is discharged after rotating 10min.
(4) it neutralizes: the water of 100wt% being added in rotary drum, then adds the neutralizer NT and 0.5wt% of 1wt%
Sodium bicarbonate adjust pH value to 5.5, adjusting temperature is 25 DEG C, and liquid is discharged after rotating 150min.
(5) it washes: the water of 200wt% being added in rotary drum, adjusting temperature is 25 DEG C, and liquid is discharged after rotating 10min.
(6) retanning: the water of 90wt% is added in rotary drum, the almond peel tannin extract of 2wt%, adjusting temperature is 30 DEG C, rotation
The almond peel tannin extract of 3wt% is added after 20min, rotates the almond peel tannin extract that 5wt% is added after 30min, rotates liquid after 40min
Body discharge.
(7) it washes: the water of 200wt% being added in rotary drum, adjusting temperature is 30 DEG C, and liquid is discharged after rotating 10min.
(8) stuffing: the water of 90wt% is added in rotary drum, 10wt% fatting agent LQ-5, adjusting temperature is 30 DEG C, rotation
The formic acid of 1wt% is added after 30min in rotary drum, adjusting pH value to 3 is rotated further by 30min.
(9) go out to rouse: skin being taken out from rotary drum, is dried.
The preparation method of used almond peel tannin extract in step (6), specifically includes the following steps:
(1) it takes 1g almond peel coarse powder and 15mL concentration for 70% ethanol solution, launches into extractor, add at 70 DEG C
After hot 1h, filtrate is concentrated to get crude extract by filtering.
(2) crude extract concentration is configured to the sample liquid of 0.80mg/mL, it is big in HP-20 type with the loading flow velocity of 0.5BV/h
The sample liquid that 4BV is added in the resin column of hole is adsorbed, and the water elution pillar of 2BV is added, is then solved with 70% ethanol solution
It inhales, stripping liquid drying is concentrated to get almond peel tannin extract.
Embodiment 2
A kind of leather retanning method of the invention, specifically includes the following steps:
(1) it draws materials: sheep dress ornament wet blue leather being taken to weigh, the reagent dosage in subsequent step is with the percentage table of the weight
Show.
(2) return water: wet blue leather is placed in rotary drum, is placed in rotary drum, and the water of 300wt%, the degreasing agent of 1.5wt% is added
DT, adjusting temperature is 35 DEG C, and liquid is discharged after rotating 40min.
(3) it washes: the water of 300wt% being added in rotary drum, adjusting temperature is 35 DEG C, and liquid is discharged after rotating 30min.
(4) it neutralizes: the water of 200wt% being added in rotary drum, then adds the neutralizer NT's and 1wt% of 2wt%
Sodium formate adjusts pH value to 5.8, and adjusting temperature is 40 DEG C, and liquid is discharged after rotating 180min.
(5) it washes: the water of 300wt% being added in rotary drum, adjusting temperature is 40 DEG C, and liquid is discharged after rotating 20min.
(6) retanning: the water of 120wt% is added in rotary drum, the almond peel tannin extract of 3wt%, adjusting temperature is 40 DEG C, rotation
The almond peel tannin extract of 4wt% is added after 30min, rotates the almond peel tannin extract that 5wt% is added after 40min, rotates liquid after 50min
Body discharge.
(7) it washes: the water of 300wt% being added in rotary drum, adjusting temperature is 40 DEG C, and liquid is discharged after rotating 20min.
(8) stuffing: the water of 120wt% is added in rotary drum, 15wt% fatting agent LQ-5, adjusting temperature is 45 DEG C, rotation
The oxalic acid of 1.5wt% is added after 40min in rotary drum, adjusting pH value to 4 is rotated further by 60min.
(9) go out to rouse: skin being taken out from rotary drum, is dried.
The preparation method of used almond peel tannin extract in step (6), comprising the following steps:
(1) it takes 1g almond peel coarse powder and 20mL concentration for 60% ethanol solution, launches into extractor, add at 60 DEG C
After hot 2h, filtering, filtrate is concentrated to get crude extract.
(2) crude extract concentration is configured to the sample liquid of 1.20mg/mL, with the loading flow velocity of 1BV/h, in HP-20 type macropore
The sample liquid that 5BV is added in resin column is adsorbed, and the water elution pillar of 2BV is added, is then desorbed with 70% ethanol solution,
Stripping liquid drying is concentrated to get almond peel tannin extract.
Embodiment 3
A kind of leather retanning method of the invention, specifically includes the following steps:
(1) it weighs: sheep dress ornament wet blue leather being taken to weigh, the reagent dosage in subsequent step is with the percentage table of the weight
Show.
(2) return water: wet blue leather is placed in rotary drum, is placed in rotary drum, and the water of 150wt%, the degreasing agent of 0.5wt% is added
DT, adjusting temperature is 20 DEG C, and liquid is discharged after rotating 20min.
(3) it washes: the water of 350wt% being added in rotary drum, adjusting temperature is 20 DEG C, and liquid is discharged after rotating 20min.
(4) it neutralizes: the water of 150wt% being added in rotary drum, then adds the neutralizer NT's and 2wt% of 3wt%
Sodium formate adjusts pH value to 5, and adjusting temperature is 30 DEG C, and liquid is discharged after rotating 200min.
(5) it washes: the water of 250wt% being added in rotary drum, adjusting temperature is 30 DEG C, and liquid is discharged after rotating 15min.
(6) retanning: the water of 150wt% is added in rotary drum, the almond peel tannin extract of 2wt%, adjusting temperature is 25 DEG C, rotation
The almond peel tannin extract of 3wt% is added after 25min, rotates the almond peel tannin extract that 4wt% is added after 35min, rotates liquid after 45min
Body discharge.
(7) it washes: the water of 250wt% being added in rotary drum, adjusting temperature is 25 DEG C, and liquid is discharged after rotating 15min.
(8) stuffing: the water of 150wt% is added in rotary drum, 20wt% fatting agent LQ-5, adjusting temperature is 55 DEG C, rotation
The oxalic acid of 2wt% is added after 90min in rotary drum, adjusting pH value to 3 is rotated further by 50min.
(9) go out to rouse: skin being taken out from rotary drum, is dried.
The preparation method of used almond peel tannin extract in step (6), comprising the following steps:
(1) it takes 1g almond peel coarse powder and 10mL concentration for 60% ethanol solution, launches into extractor, add at 90 DEG C
After hot 1h, filtering, filtrate is concentrated to get crude extract.
(2) crude extract concentration is configured to the sample liquid of 1.60mg/mL, it is big in HP-20 type with the loading flow velocity of 0.5BV/h
The sample liquid that 3BV is added in the resin column of hole is adsorbed, and the water elution pillar of 2BV is added, is then solved with 70% ethanol solution
It inhales, stripping liquid drying is concentrated to get almond peel tannin extract.
Embodiment 4
A kind of leather retanning method of the invention, specifically includes the following steps:
(1) it weighs: sheep dress ornament wet blue leather being taken to weigh, the reagent dosage in subsequent step is with the percentage table of the weight
Show.
(2) return water: wet blue leather is placed in rotary drum, is placed in rotary drum, and the water of 350wt%, the degreasing agent of 2wt% is added
DT, adjusting temperature is 35 DEG C, and liquid is discharged after rotating 50min.
(3) it washes: the water of 350wt% being added in rotary drum, adjusting temperature is 35 DEG C, and liquid is discharged after rotating 30min.
(4) it neutralizes: the water of 200wt% being added in rotary drum, then adds the neutralizer NT's and 2wt% of 1wt%
Sodium formate adjusts pH value to 6, and adjusting temperature is 40 DEG C, and liquid is discharged after rotating 200min.
(5) it washes: the water of 300wt% being added in rotary drum, adjusting temperature is 40 DEG C, and liquid is discharged after rotating 20min.
(6) retanning: the water of 100wt% is added in rotary drum, the almond peel tannin extract of 3wt%, adjusting temperature is 40 DEG C, rotation
The almond peel tannin extract of 4wt% is added after 30min, rotates the almond peel tannin extract that 4wt% is added after 40min, rotates liquid after 50min
Body discharge.
(7) it washes: the water of 300wt% being added in rotary drum, adjusting temperature is 40 DEG C, and liquid is discharged after rotating 20min.
(8) stuffing: the water of 100wt% is added in rotary drum, 20wt% fatting agent LQ-5, adjusting temperature is 55 DEG C, rotation
The oxalic acid of 2wt% is added after 60min in rotary drum, adjusting pH value to 4 is rotated further by 60min.
(9) go out to rouse: skin being taken out from rotary drum, is dried.
The preparation method of used almond peel tannin extract in step (6), comprising the following steps:
(1) it takes 1g almond peel coarse powder and 15mL concentration for 50% ethanol solution, launches into extractor, add at 80 DEG C
After hot 2h, filtering, filtrate is concentrated to get crude extract.
(2) crude extract concentration is configured to the sample liquid of 1.20mg/mL, with the loading flow velocity of 1BV/h, in HP-20 type macropore
The sample liquid that 4BV is added in resin column is adsorbed, and the water elution pillar of 2BV is added, is then desorbed with 70% ethanol solution,
Stripping liquid drying is concentrated to get almond peel tannin extract.
Embodiment 5
A kind of leather retanning method of the invention, specifically includes the following steps:
(1) it weighs: sheep dress ornament wet blue leather being taken to weigh, the reagent dosage in subsequent step is with the percentage table of the weight
Show.
(2) return water: wet blue leather is placed in rotary drum, is placed in rotary drum, and the water of 250wt%, the degreasing agent of 1wt% is added
DT, adjusting temperature is 30 DEG C, and liquid is discharged after rotating 40min.
(3) it washes: the water of 250wt% being added in rotary drum, adjusting temperature is 30 DEG C, and liquid is discharged after rotating 20min.
(4) it neutralizes: the water of 200wt% being added in rotary drum, then adds the neutralizer NT's and 1wt% of 2wt%
Sodium formate adjusts pH value to 5, and adjusting temperature is 35 DEG C, and liquid is discharged after rotating 180min.
(5) it washes: the water of 250wt% being added in rotary drum, adjusting temperature is 30 DEG C, and liquid is discharged after rotating 15min.
(6) retanning: the water of 100wt% is added in rotary drum, the almond peel tannin extract of 3wt%, adjusting temperature is 30 DEG C, rotation
The almond peel tannin extract of 3wt% is added after 25min, rotates the almond peel tannin extract that 4wt% is added after 35min, rotates liquid after 45min
Body discharge.
(7) it washes: the water of 200wt% being added in rotary drum, adjusting temperature is 35 DEG C, and liquid is discharged after rotating 15min.
(8) stuffing: the water of 120wt% is added in rotary drum, 15wt% fatting agent LQ-5, adjusting temperature is 50 DEG C, rotation
The citric acid of 2wt% is added after 60min in rotary drum, adjusting pH value to 4 is rotated further by 50min.
(9) go out to rouse: skin being taken out from rotary drum, is dried.
The preparation method of used almond peel tannin extract in step (6), comprising the following steps:
(1) it takes 1g skin coarse powder and 20mL concentration for 60% ethanol solution, launches into extractor, heat 2h at 80 DEG C
Afterwards, it filters, filtrate is concentrated to get crude extract.
(2) crude extract concentration is configured to the sample liquid of 1.00mg/mL, with the loading flow velocity of 1BV/h, in HP-20 type macropore
The sample liquid that 4BV is added in resin column is adsorbed, and the water elution pillar of 2BV is added, is then desorbed with 70% ethanol solution,
Stripping liquid drying is concentrated to get almond peel tannin extract.
Comparative example 1
Sheep wet blue leather retanning step specifically:
(1) it weighs: sheep dress ornament wet blue leather being taken to weigh, the reagent dosage in subsequent step is with the percentage table of the weight
Show.
(2) return water: wet blue leather is placed in rotary drum, is placed in rotary drum, and the water of 300wt%, the degreasing agent of 1.5wt% is added
DT, adjusting temperature is 35 DEG C, and liquid is discharged after rotating 40min.
(3) it washes: the water of 300wt% being added in rotary drum, adjusting temperature is 35 DEG C, and liquid is discharged after rotating 30min.
(4) it neutralizes: the water of 200wt% being added in rotary drum, then adds the neutralizer NT's and 1wt% of 2wt%
Sodium formate adjusts pH value to 5.8, and adjusting temperature is 40 DEG C, and liquid is discharged after rotating 180min.
(5) it washes: the water of 300wt% being added in rotary drum, adjusting temperature is 40 DEG C, and liquid is discharged after rotating 20min.
(6) retanning: the water of 120wt% is added in rotary drum, the BA tannin extract of 2wt%, adjusting temperature is 40 DEG C, rotation
The BA tannin extract of 3wt% is added after 30min, rotates the BA tannin extract of addition 5wt% after 40min, liquid is discharged after rotating 50min.
(7) it washes: the water of 300wt% being added in rotary drum, adjusting temperature is 40 DEG C, and liquid is discharged after rotating 20min.
(8) stuffing: the water of 120wt% is added in rotary drum, 15wt% fatting agent LQ-5, adjusting temperature is 45 DEG C, rotation
The citric acid of 1.5wt% is added after 40min in rotary drum, adjusting pH value to 3~4 is rotated further by 60min.
(9) go out to rouse: skin being taken out from rotary drum, is dried.
The above-mentioned almond peel powder used comes from almond processing industry waste, not can cause environmental pollution, moreover it is possible to right
Effective component develops and utilizes in waste, meets very much China's green sustainable development theory.
BA tannin extract use commercially available in almond peel tannin extract prepared by above-mentioned five embodiments and comparative example 1 is led in the world
Hide powder method carries out tannin content analysis, the results are shown in Table 1.It can be seen that tannin content and BA tannin extract in embodiment in table 1
Tannin content is suitable.
Table 1
| Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 | Comparative example 1 | |
| Tannin content/% | 43.43±0.95 | 41.34±1.02 | 46.71±0.80 | 50.62±1.25 | 50.13±1.06 | 48.54±0.83 |
Crust leather after retanning in five embodiments and comparative example 1 is subjected to quantitative measurement, comparing result is shown in Fig. 1.From
It can show that the elongation at break of embodiment 1 and embodiment 2 is slightly less than comparative example 1 in Fig. 1, the elongation at break of embodiment 3~5 is equal
Higher than comparative example 1.And tensile strength and tearing strength are above comparative example 1 in each embodiment.
Crust leather optics picture after 1 retanning of all embodiments and comparative example is shown in Fig. 2.As can be seen from Figure 2 embodiment 1~
Leather body consolidation, the grain of the crust leather of 5 preparations are full, and color is shallower, provides advantage for subsequent dyeing process.
Crust leather after 1 retanning of all embodiments and comparative example thickens rate, shrinkage temperature comparison is shown in Table 2.It can from table 2
Out, the crust leather after a little higher than BA tannin extract retanning of the shrinkage temperature of the crust leather after Examples 1 to 5 retanning, and it is then much high to thicken rate
Crust leather after BA tannin extract retanning shows that almond peel tannin extract can enter inside crust leather well, and multiple spot occurs with collagenous fibres
Crosslinking, so that the performance of crust leather be made to be promoted.
Table 2
| Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 | Comparative example 1 | |
| Thicken rate/% | 48.65±5.53 | 50.72±5.01 | 40.81±6.34 | 45.65±3.21 | 43.93±4.41 | 37.46±6.32 |
| Shrinkage temperature/DEG C | 125.4±3.5 | 126.7±3.1 | 128.1±2.8 | 127.4±3.9 | 126.32±4.2 | 123.7±2.8 |
Claims (10)
1. a kind of leather retanning method, which comprises the following steps:
(1) it draws materials: getting out wet blue leather, water, degreasing agent, neutralizer, lye, almond peel tannin extract, fatting agent and acid solution, wherein
Water, degreasing agent, neutralizer, lye, almond peel tannin extract, fatting agent and acid solution dosage on the basis of the weight of wet blue leather；
(2) return water: wet blue leather is added to the water, and degreasing agent is added, and liquid is discharged after adjusting temperature；
(3) it washes: continuously adding water, liquid is discharged after adjusting temperature；
(4) it neutralizes: continuously adding water, then adjust pH value to 5~6, liquid is discharged after adjusting temperature；
(5) it washes: continuously adding water, liquid is discharged after adjusting temperature；
(6) retanning: continuously adding the water of 90~150wt%, adds the almond peel tannin extract of 2~3wt%, adjust temperature be 25~
40 DEG C, the almond peel tannin extract of 3~4wt% of addition after 20~30min is rotated, rotates the apricot of 4~5wt% of addition after 30~40min
Liquid is discharged after rotating 40~50min for benevolence skin tannin extract；
(7) it washes: continuously adding water, liquid is discharged after adjusting temperature；
(8) stuffing: continuously adding water, and fatting agent be added, and after adjusting temperature, adjusts pH value to 3~4；
(9) go out to rouse: skin being taken out, is dried, crust leather is obtained.
2. leather retanning method according to claim 1, which is characterized in that the system of almond peel tannin extract described in step (6)
Standby process specifically:
It (6.1) is that 1:10~1:20 weighs almond peel powder and ethanol solution according to solid-to-liquid ratio, almond peel powder and ethyl alcohol is molten
Liquid mixing, obtains mixed liquor；
(6.2) mixed liquor is heated to 1~2h at 60~90 DEG C, then filters, be concentrated, obtain crude extract；
(6.3) crude extract is purified, obtains almond peel tannin extract.
3. leather retanning method according to claim 2, which is characterized in that in step (6.3), crude extract is purified specific
Are as follows:
Crude extract is configured to the sample liquid that concentration is 0.80~1.60mg/mL, with the loading flow velocity of 0.5~1BV/h, in macropore tree
The sample liquid that 3~5BV is added in rouge column is adsorbed, and the water elution pillar of 2BV is added, is then solved with 70% ethanol solution
It inhales, by the dry concentration of stripping liquid.
4. leather retanning method according to claim 2, which is characterized in that the almond peel powder processes work from almond
Industry waste.
5. leather retanning method according to claim 1, which is characterized in that the return water of step (2) specifically: by wet blue leather
It is placed in rotary drum, the water of 150~350wt% and the degreasing agent of 0.5~2wt% is added, adjusting temperature is 20~35 DEG C, rotation 20
Liquid is discharged after~50min；
The washing of step (3) specifically: the water of 200~350wt% is added in rotary drum, adjusting temperature is 20~35 DEG C, rotation
Liquid is discharged after 10~30min；
The washing of step (5) and step (7) specifically: in rotary drum be added 200~300wt% water, adjust temperature be 25~
40 DEG C, liquid is discharged after rotating 10~20min.
6. leather retanning method according to claim 1, which is characterized in that the neutralization of step (4) specifically: in rotary drum
The water of 100~200wt% is added, then adds the neutralizer of 1~3wt% and the lye of 0.5~2wt%, adjusts pH value
To 5~6, adjusting temperature is 25~40 DEG C, and liquid is discharged after rotating 150~200min.
7. leather retanning method according to claim 6, which is characterized in that lye is sodium bicarbonate, sodium formate or sodium acetate.
8. leather retanning method according to claim 1, which is characterized in that the stuffing of step (8) specifically: in rotary drum
Be added 90~150wt% water and 10~20wt% fatting agent, adjust temperature be 30~55 DEG C, rotate 30~90min after
The acid solution of 1~2wt% is added in rotary drum, adjusts pH value to 3~4, is rotated further by 30~60min.
9. leather retanning method according to claim 8, which is characterized in that acid solution is formic acid, oxalic acid or citric acid.
10. the crust leather prepared using leather retanning method described in claim 1~9 any one.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116219086A (en) * | 2023-02-07 | 2023-06-06 | 陕西科技大学 | Flame-retardant ecological automobile leather and production process thereof |
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|---|---|---|---|---|
| CN104962667A (en) * | 2015-06-23 | 2015-10-07 | 兴业皮革科技股份有限公司 | Quick producing process for pure vegetable tanning cattle leather |
| 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 |
| CN105950793A (en) * | 2016-06-01 | 2016-09-21 | 际华三五二皮革服装有限公司 | Production method of semi-vegetable tanning goat clothing leather |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104962667A (en) * | 2015-06-23 | 2015-10-07 | 兴业皮革科技股份有限公司 | Quick producing process for pure vegetable tanning cattle leather |
| 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 |
| CN105950793A (en) * | 2016-06-01 | 2016-09-21 | 际华三五二皮革服装有限公司 | Production method of semi-vegetable tanning goat clothing leather |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116219086A (en) * | 2023-02-07 | 2023-06-06 | 陕西科技大学 | Flame-retardant ecological automobile leather and production process thereof |
| CN116219086B (en) * | 2023-02-07 | 2024-01-19 | 陕西科技大学 | Flame-retardant ecological automobile leather and production process thereof |
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