CN101956029A

CN101956029A - Control method of chrome in leather production

Info

Publication number: CN101956029A
Application number: CN2010102989176A
Authority: CN
Inventors: 陈荣辉
Original assignee: Fengan Leather Co Ltd
Current assignee: Fengan Leather Co Ltd
Priority date: 2010-09-26
Filing date: 2010-09-26
Publication date: 2011-01-26

Abstract

The invention discloses a control method of chrome in leather production. The control method comprises the following steps of: adding chrome energy in the later period of a neutralization step to rotate for 45min and washing, and eliminating a micro amount of hexavalent chrome possibly existing in a blue wet leather and a crust leather (which are the raw materials for production); and replacing fish oil with phosphorylation synthetic oil in a stuffing step so as to prevent Cr+3 from being oxidized into Cr+6 in a drying process. The invention effectively prevents trivalent chrome from being oxidized into the hexavalent chrome in the production process and can ensure that the produced leather product is tested to reach the standard. The produced product is tested that the Cr+6 content is less than 3ppm and reaches export indexes of European Union.

Description

The control method of chromium during leather is produced

Technical field

The present invention relates to the working method of leather, relevant with the control method of chromium in the leather production especially.

Background technology

In the prior art, leather processing method capable is: the fur group is criticized, and---weighing,---------------------------weighing,------softening without ammonium---------------------useless chrome liquor heats up, and---useless chrome liquor reclaims, and---blue skin goes out drum, and------------taking horse displays, and---------returning wet,---------------------fixing---cooling---goes out drum and takes horse---to leave standstill that------vacuum---is hung and dried that dry---returning wet,---beating soft,------falling soft,------toggling---Ru Ku sorting---covered with paint, lacquer, colour wash, etc. to go out drum in oil return in water squeezing stretching,s extension shaving warehouse-in deliming without ammonium split fleshing in the packed dyeing stuffing in washing in neutralization in draining in retanning in draining in water squeezing in classification to take horse to carry alkali to add useless chromium night in tanning in draining in pickling in washing in deburring to go out drum to protect a hair depilation liming in main immersion in washing in pre-immersion.

Wherein, the general chromium powder that adds in the retanning operation, concrete consumption are 4-6% (by weight percentage, adding 4-6 kilogram chromium powder in per 100 kilograms of leathers).

The chromium powder that uses generally all is 3 valency chromium at present, because the chromium powder product stability is poor, can make trivalent chromium be oxidized to sexavalent chrome under the condition of high temperature oxidation, makes product Cr in test ^{+ 6}＞3ppm can't reach European Union's outlet index.

Goal of the invention

The objective of the invention is to be to provide the control method of chromium in a kind of leather production, prevent effectively that in process of production trivalent chromium is oxidized to sexavalent chrome.

In order to achieve the above object, solution of the present invention is:

The control method of chromium during a kind of leather is produced, in and the operation later stage add chromium and can rotate washing in 45 minutes only, be used for the chromic removing of the interior trace that may exist of wet blue leather and crust leather (wet blue leather and crust leather are to throw the raw material that drum is produced); And, prevent from drying process, to make Cr at stuffing operation phosphorylation synthetic oil replacement fish oil ^{+ 3}Be oxidized to Cr ^{+ 6}

Wherein, described in and the temperature of operation be 28 ℃, by wet blue leather weight: add entry 100%, sodium formiate 2.5%, neutralizing agent (tannin compound) 2.5% changeed 20 minutes, adding sodium bicarbonate 1.5% changeed 45 minutes, and chromatize energy clean 1.5% changeed 45 minutes again, entered washing step again.

The temperature of described stuffing operation is 45 ℃, by wet blue leather weight: add entry 100%, EG60 (synthetic fat liquor) 2%, JCF (in conjunction with fatting agent) 2.5%, and JE3% (the plant fatting agent, 3% weight of pressing wet blue leather is calculated, 100 jin wet blue leather is wanted 3 jin JE) 2.5%, RSS (phosphorylation synthetic oil, synthetic fat liquor) 2% changeed 60 minutes.

After adopting such scheme, the present invention compared with prior art:

One, in and the operation later stage, adding chromium can be clean, the chromic removing of the trace that may exist in wet blue leather and the crust leather (raw material of operation) can be reduced sexavalent chrome;

Two, replace fish oil in the stuffing operation with the phosphorylation synthetic oil, can prevent from drying process, to make Cr ^{+ 3}Be oxidized to Cr ^{+ 6}, further reduce sexavalent chrome.

Like this, the present invention prevents effectively that in process of production trivalent chromium is oxidized to sexavalent chrome, can guarantee that the leather products test that makes is up to standard.Test makes product, Cr ^{+ 6}Content is lower than 3ppm, reaches European Union's outlet index.

Specific embodiment

The control method of chromium was the improvement that former leather is produced during a kind of leather that the present invention discloses was produced, and comprised for two steps:

The first step, be in and the operation later stage, add the sexavalent chrome that chromium can clean (Guangdong Demei Fine Chemical Co., Ltd.'s productions) can be removed the interior trace that may exist of wet blue leather (raw material skin).Specifically: in and the temperature of operation be 28 ℃, by wet blue leather weight: add entry 100%, sodium formiate 2.5%, neutralizing agent (tannin compound) 2.5% changeed 20 minutes, and adding sodium bicarbonate 1.5% changeed 45 minutes, chromatize energy clean 1.5% changeed 45 minutes again, entered washing step again.Described chromium can be the removing that is specifically designed to drop hexavalent chromium in wet blue leather and the crust leather only, outward appearance: clear crystal, and Ph value (1%): 5.5～7.5, working substance content (%): 95 ± 1.0.

Second step was in the stuffing operation, replaced fish oil with the phosphorylation synthetic oil, prevented to make in drying process Cr ^{+ 3}Be oxidized to Cr ^{+ 6}Specifically: the temperature of stuffing operation is 45 ℃, by wet blue leather weight: add entry 100%, former leather also adds EG60 2% when producing, and JCF 2.5%, and JE3% 2.5%, N226 (fish oil) 2%, changeed 60 minutes, the present invention changes into and adds EG60 2%, and JCF 2.5%, JE3% 2.5%RSS (phosphorylation synthetic oil) 2% changeed 60 minutes.

Test Cr to making leather products ^{+ 6}Content is lower than 3ppm, reaches European Union's outlet index.

Claims

1. the control method of chromium during a leather is produced is characterized in that: in and the operation later stage add chromium and can rotate washing in 45 minutes only; And at stuffing operation phosphorylation synthetic oil replacement fish oil.

2. the control method of chromium during a kind of according to claim 1 leather is produced, it is characterized in that: the temperature with operation in described is 28 ℃, by wet blue leather weight: add entry 100%, sodium formiate 2.5%, neutralizing agent 2.5% changeed 20 minutes, and adding sodium bicarbonate 1.5% changeed 45 minutes, chromatize energy clean 1.5% changeed 45 minutes again, entered washing step again.

3. the control method of chromium during a kind of according to claim 1 leather is produced, it is characterized in that: the temperature of described stuffing operation is 45 ℃, by wet blue leather weight: add entry 100%, synthetic fat liquor 2%, in conjunction with fatting agent 2.5%, plant fatting agent 2.5%, synthetic fat liquor 2% changeed 60 minutes.