Leather manufacturing method with hair saving and hair removing functions

A hair-preserving, hair-removing, and hair-filtering technology, which is applied in the field of tanning, can solve problems such as high production costs and environmental pollution of tanning pollutants, and achieve the effects of good compactness, improved leather yield, and moderate effect

CN107619887AInactive Publication Date: 2018-01-23NINGXIA JINHAI LEATHER IND
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2018-01-23
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to the technical field of leather manufacturing, in particular to a leather manufacturing method with the hair saving and hair removing functions. The leather manufacturing method comprises the following steps: pre-soaking in water; flesh removing; main soaking in water; unhairing and liming; and flesh removing on limed skin and splitting. According to the leather manufacturing method provided by the invention, a sulfydryl urea compound LM and an expanding agent LS, namely an organic chelate alkali, are utilized in the hair saving and liming process, so that the sulfide consumption in the lime-soda liming process can be reduced by 66.6%, the lime consumption can be reduced by 74.3%, and the COD emission in the liming process can be reduced by 80%. However, the properties of finished leather are still good.
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Description

technical field

[0001] The present application relates to the technical field of tanning, in particular to a tanning method for hair preservation and depilation. Background technique

[0002] Tannery is a well-known heavy polluting industry, and the dehairing and liming process is the primary process link that produces huge pollution. The pollutants produced here account for more than 60% of the total pollution discharge in the entire tannery process.

[0003] At present, there are many academic researches on hair preservation and depilation technology abroad. The Sirolime method is an earlier and widely used hair preservation and depilation process, which was successfully developed by Australia's CSIRO in 1981. The process is divided into five processes: sodium hydrosulfide impregnation, calcium hypochlorite oxidation, lime activation, mechanical depilation, and liming. The Sirolime method can recover a large amount of wool, the waste liquid is easy to realize recycling, ...

Examples

Embodiment 1

[0040] The whole process of leather production mainly includes the process plan and process: batching of raw cowhide→head and tail removal→weighing→presoaking→washing→fleshing→main soaking→washing→fleshing→hair preservation and depilation→filtering→ Liming→fleshing→washing→weighing→ammonium-free deliming→softening→washing→pickling→less chromium or no tanning→resting on a horse→grading→squeezing and stretching→split (top layer and second layer leather) (Sold))--Trim trimming→shaving→weighing→retanning→washing→neutralization→dyeing and fatliquoring→over-dyeing→washing→horse riding→squeezing and stretching→resurfacing→softening→pressing plate→grinding Leather→clean surface→grinding leather→back cover→stand still→roller oiled→stand still (4 hours)→press plate→feel layer→trimming→measure ruler storage.

[0041] Among them, such as figure 1 and figure 2As shown, the present embodiment provides a kind of tanning method for hair preservation and depilation, which mainly includes th...

Embodiment 2

[0062] On the basis of Example 1, this example mainly describes the analysis of experimental data using SINOBEAMLM and SINOBEAM LS in the above-mentioned tanning method for hair preservation and depilation.

[0063] The chemical structure of described mercaptourea is:

[0064]

[0065] wherein R1 = H, -CH3, -CH2-CH3; R2 = -CH2-, -CH2-CH2- and so on.

[0066] This kind of compound molecule contains -SH and -NH2 active groups at the same time, which can depilate and disperse collagen fibers at the same time. This innovative product can simplify and improve the depilation and liming process in the process of tanning.

[0067] In particular, the general properties of the mercaptourea LM:

[0068] (1) Appearance: light brown transparent liquid with sulfide smell;

[0069] (2), solid content: 25%;

[0070] (3), pH value: 4.5.

[0071] 1), mercaptourea hair removal effect

[0072] According to the experimental procedure in Example 1, select triethanolamine, thioglycolic acid ...