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Formaldehyde-free melamine retanning agent, preparation method and equipment

A formaldehyde melamine, retanning agent technology, applied in small raw hide/large raw hide/leather/fur treatment, tanning treatment, small raw hide/large raw hide/leather hide/fur chemical treatment, etc., can solve problems such as the harm of leather products

Inactive Publication Date: 2021-05-11
史密特(南京)皮革化学品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem in the prior art that the retanning agent produces free formaldehyde and cause leather products to cause a lot of harm to the human body, the present invention proposes a formaldehyde-free melamine retanning agent, preparation method and equipment

Method used

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  • Formaldehyde-free melamine retanning agent, preparation method and equipment
  • Formaldehyde-free melamine retanning agent, preparation method and equipment
  • Formaldehyde-free melamine retanning agent, preparation method and equipment

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preparation example Construction

[0031] Adopt the preparation method of a kind of formaldehyde-free melamine retanning agent as described above, comprise the steps:

[0032] S101: mixing starch, water, and periodic acid in parts by weight and then stirring to obtain a mixed solution;

[0033] S102: adjust the pH of the mixed solution to 1.8-2 in the follow-up reaction vessel, raise the temperature to 30-40° C. and react for 5-8 hours to prepare a polyaldehyde compound solution;

[0034] S103: Adjust the pH of the polyaldehyde compound solution to 9-10, raise the temperature to 80-90° C., add the amino compound in parts by weight, and stir again until the reaction is complete;

[0035] S104: After the reaction is complete, lower the temperature to 70°C, adjust the pH to 4-5, add leveling agent in parts by weight, and let it stand for 2 hours to prepare a formaldehyde-free melamine retanning agent.

[0036] Further, the amino compound is a polymer of 50-60 parts of urea and 20-30 parts of melamine.

[0037] F...

specific Embodiment

[0053] 300g of starch, 650g of water, and 2g of periodic acid are put into the mixing tank 10 in parts by weight and are stirred and mixed evenly by the first stirring unit 11, and then sent to the adjusting tank 20; , the heating plate 23 is heated to 40° C. for 5 hours to react to prepare a polyaldehyde compound solution; again, the acid-base regulator 21 is used to adjust the pH of the polyaldehyde compound solution to 9.5 by adding sodium hydroxide, and the heating plate 23 is used to Raise the temperature to 86°C, add 50g of urea and 30g of melamine in parts by weight, and start the second stirring unit 24 until the reaction is complete; Add acetic acid to adjust the pH to 5 and add 12g of leveling agent. After standing for 2 hours, about 1014g of formaldehyde-free melamine retanning agent can be obtained.

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PUM

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Abstract

The invention discloses a formaldehyde-free melamine retanning agent which is composed of starch, water, a periodate amino compound and a dye leveler, the invention further discloses a preparation method of the formaldehyde-free melamine retanning agent, and the preparation method comprises the following steps: mixing raw materials; preparing a polyaldehyde compound; adding an amino compound; and adding the dye leveler to prepare the retanning agent. The invention also discloses preparation equipment for the preparation method of formaldehyde - free melamine retanning agent; the preparation equipment comprises a mixing kettle and an adjusting kettle, the mixing kettle comprises a first stirring unit and a feeding pipe, the first stirring unit comprises a rotating disc, a rotating shaft and a motor, and the rotating disc is provided with a limiting cover and a plurality of inclined notches. According to the formaldehyde-free melamine retanning agent, the preparation method and the equipment, the preparation equipment and the preparation method are matched, so that the prepared retanning agent can avoid generation of formaldehyde, the application range of the retanning agent is widened, and meanwhile, the retanning effect of leather products can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of retanning agent preparation, in particular to a formaldehyde-free melamine retanning agent, a preparation method and equipment. Background technique [0002] Retanning is the most critical process in tanning production. It is known as the "golden touch" of tanning. The same kind of leather embryo can be made into solid shoe upper leather and can also be produced by using different retanning methods. For soft and plump garment leather, retanning agents not only have an important impact on the performance of the finished leather, but also play a decisive role in its quality and grade. [0003] In the prior art, the terminal product of the reaction often produces free formaldehyde, which causes the leather products prepared by the retanning agent to cause a lot of harm to the human body. Once it comes into contact with the human body, there is a serious hidden danger of disease. Contents of the invention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C3/22
CPCC14C3/22
Inventor 范观水姜本红季振兴唐省高肖丽萍
Owner 史密特(南京)皮革化学品有限公司