High-fire-retardancy aminoresin nano-complex-function tanning agent

Abstract

The invention discloses a tanning agent with high flame-resistance amino-resin nano-composite function, which is prepared by the method as follows: firstly, melamine, dicyandiamide, formaldehyde and acidic components are used as raw material to prepare flame-resistance amino-resin prepolymer; secondly, montmorillonite or organic montmorillonite are modified by tetrakis hydroxymethyl phosphonium and silane coupling agents to obtain modified montmorillonite or modified organic montmorillonite; finally, the prepared flame-resistance amino-resin prepolymer and the obtained modified montmorillonite or the modified organic montmorillonite are processed through in-situ intercalation compounding reaction. The tanning agent not only has better tanning performance and retanning filling performance, but also brings good flame-resistance and washable migration resistance to leather goods, and the addition quantity is less, and the flame retardant efficiency is high.

Description

technical field [0001] The invention belongs to the technical field of leather chemical materials, and in particular relates to a highly flame-retardant amino resin nanocomposite functional tanning agent for leather. Background technique [0002] As a polymer material, leather is processed by chemical methods from raw hide preparation, tanning, fatliquoring, dyeing and finishing to finished leather, so each process requires certain Chemical materials, mainly including leather tanning agents, fatliquor, dyeing agents, finishing agents and other auxiliaries. Because these materials and leather will produce toxic fumes and corrosive gases when burned, it affects the application of leather in fields that require a certain degree of flame retardancy, such as protective clothing, sofas, furniture, upholstery, aircraft and automotive interiors and Cushion and other fields. [0003] At present, the main way to make the leather have a certain flame retardancy is to add flame retard...

AI Technical Summary

Problems solved by technology

However, at present, phosphorus-nitrogen flame retardants are mainly used in plastics, rubber, fibers, wood, coatings, etc. If such intumescent flame retardants are applied to the flame-retardant treatment of leather, there are still the following problems: (1) the expansion Most of the type flame retardants are additive type with low reactivity, poor bonding with leather collagen fibers, poor washing resistance and migration resistance, which affects the durability of flame retardancy

(2) Poor water solubility, difficult to penetrate leather fibers, difficult to adapt to wet processing of leather

(3) Small molecular weight, poor thermal stability, and poor compatibility with macromolecular skin collagen fibers

(4) A large amount of addition not only reduces the physical and mechanical properties of the leather, but also tends to make the leather feel worse, such as hardening, rough grain, and reduced softness

However, this type of tanning agent also has some defects: 1. It is mainly used as a retanning filler and cannot be used as a main tanning agent, and it does not contribute much to the moisture and heat resistance stability of the leather. Generally, the shrinkage temperature of the leather after use can only be increased by 5 around ℃

2. Because the tanning agent contains nitrogen, although it has a certain flame retardant effect, the flame retardant effect is poor, and it cannot be used as a flame retardant for leather alone.

3. When the tanning agent is a liquid product, it is not resistant to storage under acidic conditions, especially low pH conditions, and has poor stability, and it is easy to generate supermacromolecular precipitation polymers

4. When the tanning agent retans leather under low pH conditions, the filling effect is too strong, the leather is easy to harden, and the softness of the hand decreases.