6results about How to "Increase shrinkage temperature" patented technology

The invention discloses a porous coordination polymer tanning agent and a preparation method and application thereof, and belongs to the technical field of leather tanning agents. According to the preparation method disclosed by the invention, a metal salt solution and an organic ligand solution are used as raw materials, and the porous coordination polymer tanning agent is prepared through calcination activation treatment; according to the method, dependence on an expensive organic solvent is avoided, the synthesis condition is changed from high temperature and high pressure to room temperature and normal pressure, energy consumption is reduced, and the risk of environmental pollution is remarkably reduced; meanwhile, the use of chromium ions is avoided, the reaction conditions of the porous coordination polymer tanning agent are moderated, and the organic solvent is removed, so that the pollution to the environment and the potential threat to the human health in the preparation process and the application process of the tanning agent are effectively reduced, and the requirement of large-scale production can be met.

The invention provides a leather ion piezoelectric device and a preparation method and application thereof, and belongs to the technical field of new energy conversion, the leather ion piezoelectric device comprises a device body, and two sides of the bottom of the device body are respectively provided with a stress electrode and a reference electrode; the preparation method of the leather ion piezoelectric device comprises the steps that raw hide obtained after pickling is subjected to tanning, retanning and electrolyte treatment, ion leather is obtained, the ion leather is cut, a device body is manufactured, a stress electrode and a reference electrode are attached to the two sides of the bottom of the device body respectively, and the leather ion piezoelectric device is obtained. The leather ion piezoelectric device provided by the invention has excellent mechanical property, damp-heat-resistant stability, durability and corrosion resistance, and is convenient to transport, store and reuse; the ion piezoelectric device prepared through the preparation method is good in mechanical performance and durable temperature performance, suitable for mechanical energy collection and power generation in a more complex special environment and an actual scene bearing large pressure, and wide in application range.

This invention discloses a pH-responsive MOF nanocomposite chromium-free tanning agent, its preparation method, and its application, belonging to the technical field of chromium-free tanning agents for leather. The method disclosed in this invention involves forming a ligand with a borate ester module through the dehydration condensation of 4-carboxyphenylboronic acid and tartaric acid, and then binding zirconium to the ligand via a solvothermal method to form a MOF tanning agent. Subsequently, zirconium tartrate is loaded onto the MOF, enabling controlled release of zirconium tartrate through a pH-responsive switch in the ligand. This improves the problem of uneven tanning caused by the rapid and strong binding of zirconium ions to collagen fibers, resulting in tanned leather with a shrinkage temperature exceeding 80 °C, thereby effectively improving the quality of zirconium-tanned leather products.

This invention relates to a chromium-free tanning agent based on hydrogen bond reinforcement and its preparation method. The invention first prepares single-terminated and double-terminated -NCO ureapyrimidine ketone compounds, then reacts these compounds with an aqueous solution of bisulfite to prepare a water-soluble reactive ureapyrimidine ketone-based chromium-free non-metallic tanning agent. Compared with conventional organic synthetic tanning agents, the chromium-free tanning agent developed in this invention can both covalently bind with skin collagen and further form a quadruple hydrogen-bonded dimer in the leather fiber network through the hydrogen bond recognition effect of ureapyrimidine ketones (Upy). This strong hydrogen bonding between tanning agent molecules strengthens the molecular cross-linking network structure of the tanned leather, resulting in higher shrinkage temperature and mechanical strength. In particular, the tanning agent developed in this invention contains two types of tannin molecules of different sizes, exhibiting excellent selective filling effect. The tanned leather is full and uniform, with good softness, and can be used in the production of light-colored lightweight leather.

The invention provides a fox fur chrome-free tanning processing technology, and belongs to fine fur leather processing. Firstly, to-be-treated fox fur is sequentially subjected to degreasing treatment and softening treatment, then an F-90 tanning agent is used for pretanning, the fiber structure of the fur can be preliminarily fixed, gaps between fibers are enlarged, a smooth way is provided for subsequent permeation of the compound vegetable tanning agent, combination of tannin in the compound vegetable tanning agent and fur collagen is facilitated, and the tanning effect of the fox fur is improved. The compound vegetable tanning agent can accelerate penetration and dispersion of tannin into fur and avoid surface over tanning, so that the tanning time is shortened, the combining amount is increased, a good chrome-free tanning effect is achieved, the comprehensive effect of combined tanning is remarkably improved by controlling the composition of the compound vegetable tanning agent, the softness, shrinkage temperature and fullness of a product are improved, and the product quality is improved through dyeing and later finishing. The fox fur finished product with excellent comprehensive performance is obtained.

The invention relates to a preparation method of a rare earth zeolite tanning agent, which comprises the following steps of: dissolving rare earth oxide in hydrochloric acid with the ratio of 1: 1, and evaporating until the rare earth oxide is nearly dry; the preparation method comprises the following steps: respectively dissolving L-phenylalanine and 1, 10-o-phenanthroline in an ethanol aqueous solution, adding a LaCl3. 6H2O ethanol aqueous solution, carrying out water bath reflux for 6 hours, and standing overnight; evaporating in a water bath, precipitating and crystallizing, washing with acetone, drying, adding zeolite, mixing, and grinding into powder, so as to prepare a rare earth zeolite tanning agent; a plant-rare earth zeolite combined tanning technology comprises the following procedures of normal mass production of pickled bare leather, fatty aldehyde pre-tanning, vegetable tanning, rare earth zeolite tanning agent combined tanning, alkali extraction, water washing, drum discharging, horse building and standing, and vegetable tanning of white wet leather. The natural plant tanning agent does not contain heavy metals, formaldehyde, benzene, phenol and other harmful components, and has the advantages of no toxicity, small pollution, biodegradability and the like; the plant-rare earth zeolite cooperates with the tanning effect, so that the shrinkage temperature is greatly increased, and the mechanical property and the sensory property are improved.