Leather tanning agent of modified aminoresin and preparation method thereof
A technology of amino resin and leather, which is applied in the field of modified amino resin leather tanning agent and its preparation, which can solve the problems of endangering the health of operators, strong irritating formaldehyde gas, and high content of free formaldehyde, and achieves environmental protection and softness. Effects of performance improvement and simple preparation method
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Embodiment 1
[0052] 1. Preparation of protein degradation products
[0053] The raw material is degreased pigskin, which is fully washed with tap water, weighed 200g, added 200g of deionized water, adjusted the pH value to 7.5 with 10% sodium hydroxide solution at room temperature and normal pressure, added 1398 protease 50u / g skin, treated at 40°C for 1 hour, and then washed 5 times with deionized water. Add 500 g of deionized water to the degreased pigskin after enzyme treatment, raise the temperature to 80°C, heat and stir for 2 hours, cool down to room temperature, obtain a collagen degradation product liquid after filtration, concentrate to a mass concentration of 25%, and measure the viscosity to 4g00mPa. s.
[0054] 2. Preparation of liquid modified amino resin leather tanning agent
[0055] The raw material formula is as follows:
[0056] The raw material has the following components, and the proportioning ratio of each component is in parts by mass,
[0057] Formaldehyde 100 ...
Embodiment 2
[0070] 1. Preparation of protein degradation products
[0071] Take 100g soybean protein isolate, add 200g deionized water, adjust the pH value to 8.0 with 25% potassium hydroxide solution at room temperature and normal pressure, raise the temperature to 55°C, add 4g of 1398 protease, hydrolyze for 1 hour, and add 25% mass concentration Adjust the pH value of the hydrochloric acid solution to 4.5, heat to 80°C, heat and stir for 2 hours to degrade, separate the clear liquid after cooling, concentrate to a mass concentration of 25%, and obtain a soybean protein degradation product with a measured viscosity of 500mPa.s.
[0072] 2. Preparation of liquid modified amino resin leather tanning agent
[0073] The raw material formula is as follows:
[0074] The raw material has the following components, and the proportioning ratio of each component is in parts by mass,
[0075] Formaldehyde 100 parts
[0076] Dicyandiamide 60 parts
[0077] Sodium bisulfite 100 parts
[0078] So...
Embodiment 3
[0089] 1. Preparation of protein degradation products
[0090] Weigh 200g of casein, add 200g of distilled water and 6g of concentrated sulfuric acid at room temperature and normal pressure, heat up to 75°C under stirring, perform hydrolysis reaction for 5 hours, then adjust the pH value to 7.0 with a mass concentration of 20% sodium hydroxide solution, after layering The collagen hydrolyzate in the upper layer was taken and concentrated to a mass concentration of 25% to obtain a casein protein degradation product with a measured viscosity of 800 mPa.s.
[0091] 2. Preparation of liquid modified amino resin leather tanning agent
[0092] The raw material formula is as follows:
[0093] The raw material has the following components, and the proportioning ratio of each component is in parts by mass,
[0094] Formaldehyde 100 parts
[0095] Melamine 70 parts
[0096] Sodium bisulfite 100 parts
[0097] Casein protein degradation product solution 150 parts
[0098] 110 parts...
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Abstract
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