CN105648125B - A kind of preparation method of polyhydroxy modified soybean lecithin fatliquoring agent - Google Patents

Abstract

The invention relates to a preparation method of a polyhydroxy modified soybean lecithin leather fatliquoring agent. At present, soybean phospholipid fatliquor is widely used for fatliquoring, but the traditional fatliquor has poor water solubility and poor filling performance. In the present invention, 100 parts by mass of soybean lecithin are placed in a three-necked flask, and then 2 to 2.5 parts by mass of allyl glycidyl ether are added, the temperature is raised to 40°C, and the reaction is performed at a constant temperature for 2 hours; 5.4 to 7.7 parts by mass of formic acid are added to the system, 0.5-1 mass part of concentrated sulfuric acid is used as a catalyst, 25-40 mass parts of hydrogen peroxide is added dropwise within 1 hour, and the reaction is carried out for 8-10 hours. Raise the temperature of the system to 75°C, add 40-65 parts by mass of sodium bisulfite, and react for 3 hours; adjust the pH of the system to 7.5-8 with 40% NaOH, add 60°C hot water to adjust the solid content of the system to 60%, and stir for 30 minutes Get Improved Fatliquor. The soybean lecithin fatliquor prepared by the method has better hydrophilicity.

Description

A kind of preparation method of polyhydroxy modified soybean lecithin fatliquoring agent

technical field

The invention relates to a preparation method of a leather fatliquor, in particular to a preparation method of a polyhydroxy modified soybean lecithin leather fatliquor.

technical background

Fatliquor is one of the most used leather chemical materials in leather production, and it is also one of the important chemical materials in leather processing. It can not only lubricate the leather fibers, prevent the leather from being stiff and cracking, but also make the leather have corresponding toughness and softness, and maintain its strength. It is an important factor affecting the quality and performance of leather.

Soybean phospholipid fatliquor fatliquors the crust leather, the finished leather is soft and oily, and has unique filling, thickening and plumping functions, especially beneficial to solve the loose surface of leather. However, the HLB value of soybean lecithin is low, and the emulsification is mainly reflected in the lipophilicity. The oil solubility of soybean lecithin is very good, but the water solubility is very poor, and it is almost insoluble in water. However, the traditional fatliquor prepared from soybean lecithin has poor water solubility and poor filling ability.

Contents of the invention

The purpose of the present invention is to provide a method for preparing a modified soybean lecithin fatliquoring agent based on polyhydroxy, which has better water solubility and filling property.

To achieve the above object, the technical solution adopted in the present invention is:

Step 1: Modification of terminal amino groups contained in soybean lecithin:

Put 100 parts by mass of soybean lecithin into a three-necked flask, then add 2 to 2.5 parts by mass of allyl glycidyl ether, raise the temperature to 40° C., and react at constant temperature for 2 hours.

Step 2: Oxidative sulfitation modification of soybean lecithin:

Add 5.4-7.7 parts by mass of formic acid to the system, use 0.5-1 part by mass of concentrated sulfuric acid as a catalyst, add 25-40 parts by mass of hydrogen peroxide dropwise within 1 hour, and react for 8-10 hours. The system was heated up to 75°C, 40-65 parts by mass of sodium bisulfite was added, and reacted for 3 hours.

Step 3: Polyhydroxy soybean lecithin fatliquor:

Adjust the pH of the system to 7.5-8 with 40% NaOH, add 60°C hot water to adjust the solid content of the system to 60%, and stir for 30 minutes to obtain a polyhydroxy soybean lecithin fatliquoring agent.

Compared with existing technology, the beneficial effect of the present invention:

In the present invention, by modifying the terminal amino groups contained in soybean lecithin, and then carrying out oxidative sulfitation modification on the unsaturated bonds contained in soybean lecithin molecules, the prepared soybean lecithin fatliquor molecules contain more hydrophilic The hydroxyl group and hydrophilic sulfonic acid group have better hydrophilicity, are easier to disperse and emulsify in aqueous solution, and are more conducive to entering into the leather fiber, thereby improving the softness, oiliness and filling of the leather.

detailed description

Example 1:

Step 1: Put 100 parts by mass of soybean lecithin into a three-necked flask, then add 2 parts by mass of allyl glycidyl ether, raise the temperature to 40° C., and react at constant temperature for 2 hours.

Step 2: Add 5.8 parts by mass of formic acid to the system, use 0.6 parts by mass of concentrated sulfuric acid as a catalyst, add 30 parts by mass of hydrogen peroxide dropwise within 1 hour, and react for 8 hours. The temperature of the system was raised to 75° C., 55 parts by mass of sodium bisulfite was added, and the polyhydroxy modified soybean lecithin fatliquor was obtained after reacting for 3 hours.

Step 3: Adjust the pH of the system to 7.5-8 with 40% NaOH, add 60°C hot water to adjust the solid content of the system to 60%, and stir for 30 minutes to obtain a polyhydroxy soybean lecithin fatliquoring agent.

Example 2:

Step 1: Put 100 parts by mass of soybean lecithin into a three-necked flask, then add 2.3 parts by mass of allyl glycidyl ether, raise the temperature to 40° C., and react at constant temperature for 2 hours.

Step 2: Add 6 parts by mass of formic acid into the system, use 0.7 parts by mass of concentrated sulfuric acid as a catalyst, add 28 parts by mass of hydrogen peroxide dropwise within 1 hour, and react for 8 hours. Raise the temperature of the system to 75°C, add 45 parts by mass of sodium bisulfite, and react for 3 hours to obtain a polyhydroxy modified soybean lecithin fatliquoring agent.

Step 3: Adjust the pH of the system to 7.5-8 with 40% NaOH, add 60°C hot water to adjust the solid content of the system to 60%, and stir for 30 minutes to obtain a polyhydroxy soybean lecithin fatliquoring agent.

Example 3:

Step 1: Put 100 parts by mass of soybean lecithin into a three-necked flask, then add 2.4 parts by mass of allyl glycidyl ether, raise the temperature to 40° C., and react at constant temperature for 2 hours.

Step 2: Add 7.2 parts by mass of formic acid into the system, use 0.5 parts by mass of concentrated sulfuric acid as a catalyst, add 36 parts by mass of hydrogen peroxide dropwise within 1 hour, and react for 9 hours. The temperature of the system was raised to 75°C, 58 parts by mass of sodium bisulfite was added, and the polyhydroxy modified soybean lecithin fatliquor was obtained after reacting for 3 hours.

Step 3: Adjust the pH of the system to 7.5-8 with 40% NaOH, add 60°C hot water to adjust the solid content of the system to 60%, and stir for 30 minutes to obtain a polyhydroxy soybean lecithin fatliquoring agent.

Example 4:

Step 1: Put 100 parts by mass of soybean lecithin into a three-necked flask, add 2.2 parts by mass of allyl glycidyl ether, raise the temperature to 40° C., and react at constant temperature for 2 hours.

Step 2: Add 5.6 parts by mass of formic acid to the system, use 0.8 parts by mass of concentrated sulfuric acid as a catalyst, add 28 parts by mass of hydrogen peroxide dropwise within 1 hour, and react for 8 hours. The temperature of the system was raised to 75° C., 46 parts by mass of sodium bisulfite was added, and the polyhydroxy modified soybean lecithin fatliquor was obtained after reacting for 3 hours.

Step 3: Adjust the pH of the system to 7.5-8 with 40% NaOH, add 60°C hot water to adjust the solid content of the system to 60%, and stir for 30 minutes to obtain a polyhydroxy soybean lecithin fatliquoring agent.

According to the polyhydroxy modified soybean lecithin fatliquor prepared by the preparation method of the present invention, compared with the traditional modified soybean lecithin fatliquor, the multiple modified soybean lecithin has more hydrophilic groups, and is easier to dissolve in the water system The emulsion is formed in the medium, which is beneficial to the fatliquoring operation of the emulsion, and easily penetrates into the interior of the leather fiber, so as to obtain a good fatliquoring effect.

The content of the present invention is not limited to the examples listed, and any equivalent transformation of the technical solution of the present invention adopted by those of ordinary skill in the art by reading the description of the present invention is covered by the claims of the present invention.

Claims (1)

1. a preparation method of polyhydroxy modified soybean lecithin fatliquoring agent, is characterized in that: Achieved by the following steps: Step 1: Modification of terminal amino groups contained in soybean lecithin: Put 100 parts by mass of soybean lecithin into a three-necked flask, then add 2 to 2.5 parts by mass of allyl glycidyl ether, raise the temperature to 40°C, and react at a constant temperature for 2 hours; Step 2: Oxidative sulfitation modification of soybean lecithin: Add 5.4 to 7.7 parts by mass of formic acid into the system, use 0.5 to 1 part by mass of concentrated sulfuric acid as a catalyst, add 25 to 40 parts by mass of hydrogen peroxide dropwise within 1 hour, and react for 8 to 10 hours. Raise the temperature of the system to 75°C, add 40-65 parts by mass of sodium bisulfite, and react for 3 hours; Step 3: Polyhydroxy soybean lecithin fatliquor: Adjust the pH of the system to 7.5-8 with 40% NaOH, add 60°C hot water to adjust the solid content of the system to 60%, and stir for 30 minutes to obtain a polyhydroxy soybean lecithin fatliquoring agent.