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Amphoteric low salt pickling and low chrome tanning auxiliary and preparation method thereof

A salt soaking and amphoteric technology, which is applied in the field of preparation of cleaning aids for leather, can solve problems such as the difficulty of obtaining chrome-free tanning agents, and achieve the effects of reducing content, improving absorption rate, and enhancing binding ability

Active Publication Date: 2015-07-29
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although chrome-free tanning technology can fundamentally solve the problem of chrome pollution, it is difficult to obtain a chrome-free tanning agent comparable to the tanning performance of chrome tanning agents; and low-chrome tanning or high-absorption chrome tanning methods do not change The existing technology is conducive to the promotion of industrialization and is one of the most convenient and easy methods to reduce chromium pollution

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0041] The invention relates to a preparation method of an amphoteric, less-salt pickling and less-chrome tanning auxiliary, which is realized by the following steps:

[0042] Step 1: Dissolve 2~5g of sodium allyl sulfonate in 4~10g of water to form a solution, stir and dissolve, then add to the constant pressure dropping funnel;

[0043] Step 2: Add 9~13g of diallyldimethylammonium chloride, 6~8g of acrylic acid, 1~2g of ammonium persulfate, and 0.2~0 sodium bisulfite into a 100mL three-necked flask equipped with a stirrer and a condensing device. . 5g and 12~17g of water, heat up to 70~80°C, add dropwise the sodium allyl sulfonate solution in step 1, drop it in 20~40min, and react at constant temperature for 3~5h;

[0044] Step 3: After cooling, the pH is adjusted to 4.0-6.0, and the material is discharged to obtain an amphoteric and less-salt pickling and less-chrome tanning auxiliary.

Embodiment 1

[0046] Step 1: Dissolve 5g of sodium allyl sulfonate in 10g of water, stir to dissolve and add to the constant pressure dropping funnel;

[0047] Step 2: Add 9.4g of diallyldimethylammonium chloride, 6g of acrylic acid, 1g of ammonium persulfate, 0.25g of sodium bisulfite, and 15.6g of water into a 100mL three-necked flask equipped with a stirrer and a condensing device, and heat up To 70°C, add sodium allyl sulfonate dropwise, drop over 40 minutes, and react at constant temperature for 5 hours;

[0048] Step 3: After cooling, the pH is adjusted to 4.0, and the material is discharged to obtain an amphoteric and less-salt pickling and less-chrome tanning auxiliary.

Embodiment 2

[0050] Step 1: Dissolve 2g of sodium allyl sulfonate in 4g of water, stir to dissolve and add to the constant pressure dropping funnel;

[0051] Step 2: Add 12.5g of diallyldimethylammonium chloride, 8g of acrylic acid, 1.7g of ammonium persulfate, 0.4g of sodium bisulfite, and 16g of water into a 100mL three-necked flask equipped with a stirrer and a condensing device, and heat up To 80°C, add sodium allyl sulfonate dropwise, drop over 20 minutes, and react at constant temperature for 3 hours;

[0052] Step 3: After cooling, the pH is adjusted to 5.0, and the material is discharged to obtain an amphoteric and less-salt pickling and less-chrome tanning auxiliary.

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Abstract

The invention relates to an amphoteric low salt pickling and low chrome tanning auxiliary and a preparation method thereof and aims to solve the problem that in the traditional leather production and processing process, as a large amount of chromium ions and chloride ions is contained in chrome tanning waste liquid, severe pollution can be generated to the environment. The preparation method comprises the following steps: firstly adding sodium allysulfonate dissolved in water into a constant-pressure liquid dripping funnel, then adding diallyl dimethyl ammonium chloride, acrylic acid, ammonium persulfate, sodium bisulfite and water into a three-necked flask provided with a stirrer and a condensing device, completing dripping of the sodium allysulfonate within a certain time after temperature rise and performing constant-temperature reaction; cooling, then adjusting the pH and discharging to prepare the amphoteric low salt pickling and low chrome tanning auxiliary. When the amphoteric low salt pickling and low chrome tanning auxiliary prepared by the preparation method is applied to leather tanning, the content of Cr2O3 in the waste liquid and the contention of the chloride ions can be obviously reduced, the shrinkage temperature of wet blue leather meets the factory production requirements, and the leather quality is not affected.

Description

Technical field [0001] The present invention involves a preparation method for a cleaning auxiliary in the leather, which specifically involves a two -sex and less chromium tannasis and its preparation methods. Background technique [0002] In the process of traditional tingling production and processing, a certain amount of NACL will be added when soaking in acid, and a large amount of chromium tannis will be added during the tanning process to ensure the quality of the leather. Although the leather performance produced by this processThe environmental pollution problem brought by it is gradually valued.Because the tanning is performed directly without changing liquid after soaking, in the traditional tanning waste liquid, it contains a large amount of chromium ions and chloride ions (CR 2 O 3 The concentration is about 2000 ~ 4000mg / L, and the concentration of chloride ions is 30,000 to 4000 mg / L). A large amount of tanning waste liquid will cause severe environmental pollution...

Claims

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Application Information

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IPC IPC(8): C08F226/02C08F228/02C08F220/06C14C3/22
Inventor 马建中贾潞吕斌高党鸽
Owner SHAANXI UNIV OF SCI & TECH
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