Method for improving collagen heat stability by utilizing hydroxyapatite

A technology of hydroxyapatite and thermal stability, which is applied in the field of tanning, can solve the problems of increased cost, difficult treatment of suspended solids in production safety wastewater, troublesome operation, etc., and achieve the effect of improving stability

Active Publication Date: 2018-06-15
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, when the temperature changes and the pickling temperature exceeds 30°C, it needs to be treated with ice, and the ideal completion of the pickling process for more than 10 hours will bring operational troubles and increase costs
[0004] 2) Sheepskin and pigskin have high fat content
In order to inhibit the continued action of the enzyme, it is necessary to degrease with salt, kerosene or a large amount of degreasing agent under acidic conditions and below 30°C in industrial production, which brings difficulties to production safety and wastewater suspended matter treatment

Method used

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  • Method for improving collagen heat stability by utilizing hydroxyapatite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1: Pickling under the higher temperature of softening cowhide

[0016] (1) In parts by weight, 2 parts of calcium chloride, 2.4 parts of sodium dihydrogen phosphate, and 10 parts of water are added to the container, heated to 85°C with steam, stirred, and kept at 85±5°C with a small amount of steam. After 2 hours, Keep it warm for 4-6 hours, cool down to 25-30°C, and set aside.

[0017] (2) After soaking in water, dehairing, liming, caustic soda skin, and weighing 100 parts of the gray skin are put into the drum, delimed, washed with water, and softened.

[0018] (3) Add the composition of (1) into the softening skin drum, then add 50 parts of 25°C water, rotate for 40-60 minutes, let stand for 60 minutes, rotate for 10 minutes, and drain.

[0019] (4) Pickling: add 50 parts of water, add 8-10 parts of common salt, rotate for 10 minutes, add acid (according to the requirements of pickling), and rotate (no need to add ice when the internal temperature is ≤35°...

Embodiment 2

[0020] Example 2: degreasing of softened sheepskin at a higher temperature

[0021] (1) According to parts by weight, 1.8 parts of calcium chloride, 2.2 parts of sodium hydrogen phosphate, and 10 parts of water are added to the container, heated to 85°C with steam, stirred, and kept at 85±5°C with a small amount of steam. After 2 hours, keep warm Let stand for 4-6 hours, cool down to 25-30°C, and set aside.

[0022] (2) After immersion, depilation, liming, and weighing 100 parts of gray skins, put them into the drum, deash, wash, and soften.

[0023] (3) Add the composition of (1) into the softening skin drum, then add 50 parts of 25°C water, rotate for 40-60 minutes, let stand for 60 minutes, rotate for 10 minutes, and drain.

[0024] (4) Degreasing: Add 50 parts of water at 40°C to the drum, add 2.0 to 3 parts of degreasing agent, rotate for 40 minutes, drain, add 100 parts of water at 40±2°C, rotate for 20 minutes, and drain. Enter normal pickling.

Embodiment 3

[0025] Embodiment 3: degreasing under the higher temperature of softening pigskin

[0026] (1) According to the parts by weight, 2.4 parts of calcium nitrate, 2.4 parts of sodium dihydrogen phosphate, and 10 parts of water are added to the container, heated to 85°C with steam, stirred, and kept at 85±5°C with a small amount of steam. After 2 hours, keep warm Let stand for 4-6 hours, cool down to 25-30°C, and set aside.

[0027] (1) According to the parts by weight, 2) After soaking in water, dehairing, liming, and weighing 100 parts of gray skins, put them into a drum, deliming, washing, and softening.

[0028] (3) Add the composition of (1) into the softening skin drum, then add 50 parts of 25°C water, rotate for 40-60 minutes, let stand for 60 minutes, rotate for 10 minutes, and drain.

[0029] (4) Degreasing: Add 50 parts of water at 40±2°C to the drum, add 1.5 to 2 parts of degreasing agent, rotate for 40 minutes, drain, add 100 parts of water at 40°C, rotate for 20 minut...

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Abstract

The invention relates to a method for improving collagen heat stability by utilizing hydroxyapatite, and belongs to the technical field of tanning. The method comprises the following steps that according to the weight of limed skin, 3-5 parts of hydroxyapatite and 50-80 parts of water at the temperature of 20-30 DEG C are added in 100 parts of softening naked skin rotating drum, the softening naked skin rotating drum rotates for 40-60 minutes and stands for 60 minutes, water is drained, and the obtained naked skin is obtained. According to the method for improving the collagen heat stability by utilizing the hydroxyapatite, a nano-scale hydroxyapatite micro-core precursor is prepared by a hydrothermal method, and the micro-core precursor is permeated into the softened naked skin, so that the naked skin can be shaped to a certain degree. The physical and chemical properties, and especially the humidity resistance and heat stability are improved. The utilization value includes that the loss of the leather is reduced as the protection when the acid leaching temperature is too high; and also the pre-treatment of the hydroxyapatite can be used for degreasing the multi-fat skin at a hightemperature, so that a guarantee is provided for effective degreasing of sheep skin and pig skin before tanning.

Description

technical field [0001] The invention relates to a method for improving the thermal stability of skin collagen by using hydroxyapatite, which belongs to the technical field of tanning. Background technique [0002] In tanning, the wet heat resistance temperature of raw hides obtained after depilation, liming expansion, and protease softening is reduced from ≥65°C of raw hides to 40-45°C, and the structure is extremely unstable. As a result, there have been two problems that have been difficult to solve in the actual tanning production process: [0003] 1) When the quality of tanning is required to be guaranteed, the temperature of pickling for softened bare hides should not exceed 30°C. Therefore, when the temperature changes and the pickling temperature exceeds 30°C, it is necessary to add ice for treatment, which will bring operational troubles and cost increases to the ideal completion of the pickling process for more than 10 hours. [0004] 2) Sheepskin and pigskin have...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C1/00C14C11/00
Inventor 单志华王玉增陈慧
Owner SICHUAN UNIV
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