Method for preparing filling leather fatliquoring agent

A leather fatliquor and filling technology, which is applied in the field of polymer fatliquor preparation, can solve the problems of unsuitability for producing waterproof leather, insufficient leather softness and oily feeling, and inability to absorb leather fibers.

Inactive Publication Date: 2010-07-14
ZHEJIANG IND & TRADE VACATIONAL COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these fatliquor products have various fatliquor effects, they have the following disadvantages: they cannot be completely absorbed by leather fibers; they are easily washed off by water or organic solvents; after the finished leather is stored or used, the fatliquor in the leather will Migration occurs, which makes the initial fatliquoring effect disappear; it is not suitable for the production of waterproof leather (because a high proportion of emulsifier or hydrophilic group will bring water molecules into the leather)
For leather retanning, white leather can be obtained, but the softness and oiliness of the leather are insufficient

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0045] The preparation method of filling leather fatliquoring agent comprises the following steps:

[0046] (1) Mix component A, component B, component C and initiator according to the weight ratio of 100:8~48:0~16:0.2~5 at normal temperature, stir evenly, and then raise the temperature to 80℃~160℃ , under the action of an initiator, component A, component B and component C undergo a copolymerization reaction, and the reaction time is 3.0 to 5 hours;

[0047] (2) Add alkali to the polymer after the copolymerization reaction, the alkali and the polymer undergo a neutralization reaction at a temperature of 25°C to 60°C, and neutralize the polymer to a pH value of 6.0 to 8.5, when the pH value Continue constant temperature neutralization for 0.5 to 3.0 hours when the end point is reached.

[0048] (6) Mixing the neutralized polymer and natural phospholipid at 25°C-50°C, the weight ratio of the polymer to the natural phospholipid is 60-100:0-40.

Embodiment 1

[0051] Add 100g of corn oil, 0.2g of benzoyl peroxide, and 24g of maleic anhydride into a three-neck flask equipped with a stirrer, heat to 80°C and stir for 40 minutes at a constant temperature, then continue to raise the temperature to 120°C and stir for 3 hours at a constant temperature. Remove the unreacted monomer in vacuum, lower the temperature to 35°C, add 40% sodium hydroxide aqueous solution for neutralization, keep the system temperature not exceeding 60°C and stir for 45min until the pH of the polymer system is 7.5-8.5. . Then add 50g of natural phospholipids, and keep the temperature of the system not exceeding 50°C and stir for 60min to obtain the final product. The product is brown-yellow viscous liquid.

[0052] The product obtained in Example 1 is used to fatliquify yellow cowhide wet blue leather with a thickness of 1.2 mm. Before adding the fatliquoring agent, the pH value of the leather is neutralized to 5.5, and the liquid ratio is adjusted to be 150%, an...

Embodiment 2

[0054] Add 80g of soybean oil, 20g of oleic acid, 3.5g of ammonium persulfate, 20g of acrylic acid and 8g of methyl methacrylate into a three-neck flask equipped with a stirrer, heat it to 80°C and stir at a constant temperature for 60min, then continue to raise the temperature to 130°C ℃, stirring at constant temperature for 3h. Vacuum remove unreacted monomers, lower the temperature to 35°C, add ammonia water for neutralization, keep the system temperature not exceeding 60°C and stir for 45min until the pH of the polymer system is 7.5-8.2. Then add 40 g of natural phospholipids and stir for 60 min while keeping the system temperature not exceeding 50° C. to obtain the final product. The product is brown-yellow viscous liquid.

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Abstract

The invention provides a method for preparing a filling leather fatliquoring agent, comprising the following steps: (1) a component A and a component B or a component A, a component B and a component C undergo copolymerization in the presence of initiators, wherein the component A is at least one of natural oil containing unsaturated fatty acid, long carbon chain unsaturated fatty acid, ester of long carbon chain unsaturated fatty acid and long carbon chain unsaturated fatty acid amide; the component B is at least one of acrylic acid, methacrylic acid, ethyl acrylic acid, maleic acid, fumaric acid, glutaconic acid, vinyl acetic acid, maleic anhydride and glutaconic acid anhydride; and the component C is at least one of styrene, vinylacetate, vinyl propionate, acrylate, methacrylate, acrylamide and methacrylamide; (2) alkali is added in polymers generated after copolymerization to undergo neutralization reaction with the polymers; and (3) the neutralized polymers are mixed with the natural phospholipids. The method is economical and environmentally friendly.

Description

technical field [0001] The present invention relates to the preparation method of polymer fatliquoring agent, especially the preparation method of filling leather fatliquoring agent. Background technique [0002] Leather fatliquoring is to use fatliquor to treat the leather, so that the fatliquor is dispersed inside the leather, wherein the neutral oil component in the fatliquor forms an oil film between the leather fibers and wraps on the fiber surface, while the fatliquor is emulsified The hydrophilic groups of the agent components are chemically combined with the polar groups on the leather fiber macromolecular chains, and the long-chain hydrophobic groups extend to the outside of the fibers and arrange them neatly. As a result, the chemical adsorption force between the leather fiber molecular chains is weakened, the possibility of relative movement between the molecular chains is enhanced, the leather is prevented from becoming stiff and cracked after drying, and the fin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L33/04C08L33/14C08L35/02C08L33/06C08K5/521C08F220/10C08F222/06C08F220/28C08F220/04C08F220/06C08F220/14C08F218/08C08F212/08C08F220/56C08F222/04C08F222/14C08F222/02C08F220/54C08F218/10C08F220/16C14C9/00
Inventor 卢行芳
Owner ZHEJIANG IND & TRADE VACATIONAL COLLEGE
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