CN102586504B - Sheepskin tanning technology - Google Patents

Abstract

The invention discloses a sheepskin tanning technology, belonging to the tanning field. The sheepskin tanning technology comprises the following steps of: (1) adding 3000kg of pelt washed with softened water into an internal circulation overload rotary drum, adding 2000-4000kg of water into the pelt, and adjusting the temperature to be 38-42 DEG C; (2) adding chrome-free tanning agent TWT into the pelt, wherein the weight of the chrome-free tanning agent TWT is 2-4% of the weight of the pelt, and rotating for 3-6h; (3) adding chrome-free tanning agent Granofin Easy F-90liq into the pelt, wherein the weight of the chrome-free tanning agent Granofin Easy F-90liq is 3-5% of the weight of the pelt, and rotating for 8-12h; and (4) taking out the drum and stacking, and standing still for 35-48h. The method provided by the sheepskin tanning technology has the advantages of simplified technology, energy conservation, consumption reduction and no pollution.

Description

Sheepskin tanning technology

Technical field

The present invention relates to a kind of leather tanning process, especially a kind of Sheepskin tanning technology.

Background technology

The shortcoming of traditional technology: silicate is rich content, nontoxic in the earth's crust; But the skin that tanning goes out, not resistance to storage, variable cirrhosis is crisp.Titanium salt has advantages of fast light wash resistant and resistance to storage, but shortcoming is that to prepare separately owse more difficult.Zirconates has the advantages that as tanning agent fillibility is good, but is difficult for being penetrated into pelt inside.Chrome tanning agent over-all properties is best, and therefore at home and abroad leather field is widely used.The leather and leather products of production and sales in the market all adopts chromic salts tanning process for processing to make substantially.Because chromic salts tanning is used in process hides in process of production, can produce the chroming waste liquor of environmental pollution, must, to chroming waste liquor recycle or recycling, could eliminate the pollution of chroming waste liquor to environment.Simultaneously, in tradition chrome tanning process, during pickling, add a large amount of salt, thereby cause in leather-making waste water sodium chloride content high, increased leather-making waste water intractability, in addition, the chrome leather scrap producing in shaving operation before wet treatment after tanning must be recycled and process, otherwise also can cause the pollution to environment containing chromium solid waste.

Summary of the invention

The invention provides a kind of Sheepskin tanning technology, there is work simplification, energy-saving and cost-reducing, pollution-free, the advantages such as wet-white leather that can produce Chrome-free.

The technical solution used in the present invention is:

A Sheepskin tanning technology, is characterized in that it comprises the steps:

(1) in internal recycle overloading drum, add the washed pelt 3000kg of softening water, add water 2000-4000kg, temperature adjustment 38-42 ℃;

(2) add the chrome-free tanning agent TWT of pelt weight 2%-4%, rotate 3-6h;

(3) add the chrome-free tanning agent Granofin Easy F-90 liq of pelt weight 3%-5%, rotate 8-12h;

(4) go out drum and take horse, standing 35-48h.

The advantage of chrome-free tanning agent TWT performance is to have stronger flexibility, containing the metal such as chromium, for the wet leather in vain of pickling, tanning not, finished leather is even, position is poor little, look white, and softness is plentiful, can obtain higher shrinkage temperature 80-86 ℃, good with other material compatibleness, can reduce pickling procedure, reduce production costs.But have significant shortcoming, the free formaldehyde content of wet-white leather is higher, 200ppm, yellowing resistance is poor, and is clamminess when shaving, bad shaving.Owing to being home made materials, its price is relatively reasonable.

The advantage of Granofin Easy F-90 liq performance is that the wet-white leather of chrome-free tanning is plentiful, whiteness is good, without free formaldehyde, yellowing resistance is good, and technological operation is simple, easily control, the pH value of application is more extensive, but its shortcoming is also more obvious, its shrinkage temperature not high enough (75 ℃), product large usage quantity (8-10%), cost is high.

According to the relative merits of above two kinds of tanning agent performances, the method that adopts both to complement each other and combine, first use the TWT of pelt tare weight 2-4%, use again the Granofin Easy F-90 liq tanning of pelt tare weight 3-5%, both can meet higher shrinkage temperature, can greatly reduce its free formaldehyde content again, and wet-white leather quality is better.

The beneficial effect that adopts technique scheme to produce is:

1. adopt the domestic and international up-to-date chrome-free tanning agent TWT being developed into and Granofin Easy F-90 liq to be combined with, by controlling consumption, body lotion pH value and temperature, the time of these two kinds of tanning agents, thereby produce the wet-white leather of Chrome-free.

2. save traditional salt adding, two steps of pickling, simplified technique, shortened the time, energy-saving and cost-reducing, salt, chromium have been accomplished to zero pollutes.

3. pure white, the Chrome-free of product, can natural degradation, is that leather industry cleans and produces revolutionary innovation, is suitable for various animal's leathers field.

Embodiment

Embodiment 1

(1) in internal recycle overloading drum, add the washed pelt 3000kg of softening water, add water 3000kg, temperature adjustment 38-42 ℃;

(2) add pelt weight 3% chrome-free tanning agent TWT, rotate 4h;

(3) add pelt weight 3% chrome-free tanning agent Granofin Easy F-90 liq, rotate 12h;

(4) go out drum and take horse, standing 48h.

Embodiment 2

(1) in internal recycle overloading drum, add the washed pelt 3000kg of softening water, add water 4000kg, temperature adjustment 38-42 ℃;

(2) add pelt weight 2% chrome-free tanning agent TWT, rotate 3h;

(3) add pelt weight 4% chrome-free tanning agent Granofin Easy F-90 liq, rotate 8h;

(4) go out drum and take horse, standing 40h.

Embodiment 3

(1) in internal recycle overloading drum, add the washed pelt 3000kg of softening water, add water 2000kg, temperature adjustment 38-42 ℃;

(2) add the chrome-free tanning agent TWT of pelt weight 4%, rotate 6h;

(3) add the chrome-free tanning agent Granofin Easy F-90 liq of pelt weight 5%, rotate 10h;

(4) go out drum and take horse, standing 35h.

Claims (1)

1. a Sheepskin tanning technology, is characterized in that it comprises the steps:

(1) in internal recycle overloading drum, add the washed pelt 3000kg of softening water, add water 2000-4000kg, temperature adjustment 38-42 ℃;

(2) add the chrome-free tanning agent TWT of pelt weight 2%-4%, rotate 3-6h;

(3) add the chrome-free tanning agent Granofin Easy F-90 liq of pelt weight 3%-5%, rotate 8-12h;

(4) go out drum and take horse, standing 35-48h.