Polysiloxane and glycidol-containing strong-hydrophobicity gelatin leather finishing agent and preparation method

A technology of leather finishing agent and glycidol, which is applied in leather surface treatment, small raw hide/big raw hide/leather/fur treatment, small raw hide/large raw hide/leather skin/fur chemical treatment, etc. It can solve the problem of poor overall performance, Increased hardness and other issues

Active Publication Date: 2013-12-11
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Single aliphatic compounds such as aldehydes and polyols can locally improve the abrasion resistance, toughness, water resistance and viscosity of gelatin films (Hydrocolloids 2005, 19: 899 –907; Journal of Applied Polymer Science 1991, 43(10), 1789–1794), but the formation of a tight cross-linked network increases the hardness of the film, inhibits the soft feel of the gelatin film itself, and the overall performance is not high

Method used

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  • Polysiloxane and glycidol-containing strong-hydrophobicity gelatin leather finishing agent and preparation method
  • Polysiloxane and glycidol-containing strong-hydrophobicity gelatin leather finishing agent and preparation method
  • Polysiloxane and glycidol-containing strong-hydrophobicity gelatin leather finishing agent and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Add 12 grams of gelatin (accounting for 11.76% of the total mass) and 85 grams of deionized water into a 250ml three-neck reaction bottle equipped with a thermometer socket, a sampling port, and a condenser socket, stir and heat to 50°C. After the gelatin is completely dissolved, add 0.25mL of 3 mol / L sodium hydroxide, adjust the reaction pH to 10.0, add 10g of glycidol, and continue to stir for 8 hours after the reactants are not safely dissolved, and prepare the glycidol graft modified gelatin polymer solution (solution 1) .

[0058] Glycidyl modified gelatin 1 H NMR spectrum ( figure 1 ), the peaks of hydrogen on two carbons in the three-membered ring near δ = 2.8ppm disappear, and at the same time a new multiplet appears at δ = 3.6ppm, which may be -C H OH- and -C H 2 OH peak. The disappearance of 2 C-H absorption peaks and the formation of 1 C-H characteristic absorption peak in the spectrogram indicate that the epoxy group in the epoxy polysiloxane has re...

Embodiment 2

[0064] The described method is the same as that in Example 1, except that the mass of gelatin is changed to 3 grams (accounting for 2.83% of the total mass), the pH is changed to 6.0, and the mixture is heated and stirred to 40°C.

[0065] The viscosity of the obtained liquid is ~380 centipoise (50°C), and it is placed in a normal-pressure oven at 50°C for 6 hours to form a film with strong flexibility. The glass transition temperature (T g ) is 224℃, the T of gelatin film after modification g Decrease to -3 ℃ and 60 ℃, there is obvious microphase separation; the elongation at break of the raw gelatin film is 0, and the elongation at break of the modified gelatin film increases to 780%, indicating that the ductility of the modified gelatin is obviously enhanced; 13 C NMR shows that the γ-C signal on the lysine and arginine molecules on the gelatin molecule in the glycidol-modified gelatin product disappears, and new peaks appear at 61 and 63ppm, which are epoxy-modified col...

Embodiment 3

[0067] The described method is consistent with that of Example 1, except that the mass of gelatin is changed to 16 grams (accounting for 15.09% of the total mass), the pH is changed to 12.0, and the mixture is heated and stirred to 40°C.

[0068] The viscosity of the obtained material liquid is ~740 centipoise (50°C), and it is placed in a normal pressure oven at 50°C and dried for 6 hours to form a film with strong flexibility. The glass transition temperature (T g ) is 224℃, the T of gelatin film after modification g Decrease to 30 ℃ and 120 ℃, there is obvious microphase separation; the elongation at break of the raw gelatin film is 0, and the elongation at break of the modified gelatin film increases to 320%, indicating that the ductility of the modified gelatin is obviously enhanced; 13 C NMR shows that the γ-C signal on the lysine and arginine molecules on the gelatin molecule in the glycidol-modified gelatin product disappears, and new peaks appear at 61 and 63ppm, w...

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Abstract

The invention relates to a polysiloxane and glycidol-containing strong-hydrophobicity gelatin leather finishing agent and a preparation method. The preparation method comprises the following steps: dissolving gelatin in water to prepare aqueous solution with mass concentration of 2-20 percent; adding glycidol into a first reaction flask under the conditions of temperature of 40-70 DEG C and pH of 6-12 to obtain solution 1; adding a surfactant into a second reaction flask, continuously stirring, and meanwhile adding Si-O-Si repetitive unit-containing epoxypolysiloxane in batches or continuously to obtain solution 2, wherein the using amount of the surfactant is 0.5-20 percent of the mass of the gelatin; mixing the solution 1 and the solution 2 in different proportions, weighing 15-20 g of the mixed solution to be placed in a mold of polytetrafluoroethylene, adding 5-10 mL of one or two or three of ethanol, tetrahydrofuran and methanol and drying in a normal pressure drying oven at the temperature of 40-80 DEG C to obtain the gelatin leather finishing agent with a superior function. The finishing agent has the characteristics of strong hydrophobicity, super extensibility, heat resistance, oxidation resistance, wet scrubbing resistance and the like.

Description

technical field [0001] The invention relates to a gelatin leather finishing agent, in particular to a strongly hydrophobic gelatin leather finishing agent containing polysiloxane and glycidol and a preparation method thereof. This leather finishing agent has the characteristics of strong hydrophobicity, super ductility, heat resistance and oxidation resistance, and is especially suitable for use as a finishing agent for leather bag leather, garment leather or car leather. Background technique [0002] Gelatin is a natural polymer material obtained by thermal denaturation or physical and chemical degradation of collagen. The main component of gelatin is protein. When the temperature is lower than that of sol-gel (37°C), the stronger intermolecular hydrogen bonds promote the formation of a network structure of gelatin molecules, and this system dehydrates to form a brittle film; gelatin molecules contain more affinity Water-based, gelatin film has the characteristics of easy ...

Claims

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Application Information

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IPC IPC(8): C09D189/00C09D187/00C14C11/00D06M15/15D06M15/65C08H1/00C08G81/00
Inventor 许静李天铎唐晓龙王彦涛赵志鹏
Owner QILU UNIV OF TECH
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