39results about How to "Obvious thickening" patented technology

The invention discloses a method for preparing a urea-modified phosphonium salt tanning agent. The preparation of the tanning agent is characterized in that 160-200 parts by mass of a tetrahydroxymethyl phosphonium salt solution is added to a heat-resistant, pressure-resistant and corrosion-resistant tank equipped with a stirrer and a thermometer. in the reaction kettle. Raise the temperature to 70-90°C, adjust pH=4.5-6.5 with alkali, slowly add 25-40 parts by mass of peroxide, react for 2.0-4.0 hours, cool, adjust pH=6.0-6.5, and obtain a light yellow solution. Add 30-60 parts by mass of urea and 150-200 parts by mass of deionized water into another reactor and mix them. Add 10-15 parts by mass of the catalyst, raise the temperature to 40°C-50°C and react for 2.0-3.0 hours, and adjust the pH=5.0-6.0. Add the above-mentioned light yellow solution, heat up to 60-90°C, react for 4.0-6.0 hours, cool down to 30-40°C, slowly add 20-30 parts by mass of peroxide, and react for 1.0-2.0 hours to obtain a light yellow viscous Thick liquid chrome-free main tanning agent for leather.

A process for preparing the nano-class composite tanning agent includes using ammonium hexadecane bromide to modify Na-base montmorillonite, using vinyl monomer (acrylic acid, acrylonitrile, or ethyl acrylate) to prepare vinyl polymer, and combounding them together by solution stripping-adsorption method. Its advantages are high effect on raising the shrinking temp of sheep leather to 76 deg.C and increasing leather thickness, and high air and moisture permeability of leather.

The invention discloses a method for preparing a vinyl polymer / inorganic nanoparticle composite tanning agent by an in-situ cyclopolymerization method. The vinyl polymer / inorganic nanoparticle composite tanning agent is prepared from dimethyl diallyl ammonium chloride, vinyl monomer and inorganic nanoparticles serving as raw materials by the in-situ cyclopolymerization method. The nanoparticle composite tanning agent has certain tanning effect and can increase absorption ratio of chrome-tanning liquid waste and enhance the dyeing and fat-liquoring effect when combined with 2 percent chrome powder to taw pickled raw sheep skin; the thickness of the finished leather is obviously increased after the tanning; the physical and mechanical performance is superior, and the finished leather is endowed with certain antibacterial and anti-ultraviolet performance; and thus the nano composite tanning agent is environment-friendly. The invention provides a new method for preparing the polymer-basednano tanning agent by the in-situ cyclopolymerization method; and the prepared nano composite tanning agent can reduce the using amount of a conventional chromium tanning agent by 75 percent; and therefore, the method is clean tanning technology which can reduce the chromium pollution from the source and has important practical significance.

The invention discloses a degradable starch-degradable chromium-containing leather pulp composite as well as a preparation method and application thereof. The preparation method is characterized by comprising the following steps of: adding 80-100 parts of degradable starch, 60-80 parts of degradable chromium-containing leather pulp, 10-15 parts of hydrochloric acid with concentration being 12mol / L, 80-100 parts of water and 20-25 parts of 25-30%hydrogen peroxide into a reactor with a stirrer, stirring and reacting for 1-3hours at 85-95 DEG C; cooling the reactants to 50 DEG C, slowly adding 3-5 parts of sodium hydrogen sulfite, stirring and reacting for 1-2hours so that the reaction pulp is completely dissolved in water, and then cooling to 25 DEG C; adjusting the pH value of the reactant pulp to 4.0-5.0 by using a NaOH solution, stirring and reacting for 1-2hours, to finally obtain the degradable starch-degradable chromium-containing leather pulp composite. The problems that in the existing preparation process, starch is not modified uniformly, the oxidization selectivity is poor and production cost is high are solved. After the degradable starch-degradable chromium-containing leather pulp composite is used as leather filler for filling leather, the filled leather is thickened obviously and has high physical mechanical strength, soft and full handfeel, and therefore, the degradable starch-degradable chromium-containing leather pulp composite has excellent filling effect.

The invention relates to a method for preparing a modified titanium dioxide / succinate sulfonated hydrogenated castor composite material. Nano-TiO2 has not been reported about its application in leather fatliquor. In the present invention, firstly, anhydrous ethanol, water and nano-TiO2 are mixed and ultrasonicated, and after heating, a modifier is added to adjust the pH reaction, washed and dried to prepare modified TiO2; then hydrogenated castor oil is reacted with maleic anhydride, and added The prepared modified TiO2 is lowered to 65° C. and added with sodium bisulfite solution to react to adjust the solid content to obtain a composite material. The composite material prepared by the invention has no delamination and no oil slick when stored at room temperature for 3 months, is easy to emulsify with water, has strong stability, and is friendly to the environment. Good, also has good yellowing resistance.

This is the method of preparing the modified starch-based retanning agent of leather. It oxidates and decomposes the starch, then react with vinyl monomer to polymerize. This retannage is used to leather cure of retanning, after retanning the leather feels soft and comfortable, exquisite surface, color uniformity, augment ply efficiently, no color withdraw. This chrome tanning can be used before retanning, and it can increase the absorption of the augmet, and decrease the quantity of chrome in the waste solution. The modified starch-based retanning agent of leather is a product valuable to environment protection, and has a significant mean of decreasing industrial pollution.

The invention relates to a method for synthesizing high molecular retanning dyeing auxiliary agents through enzyme catalysis, which comprises the following steps: dissolving p-aminobenzene sulfonic acid and 2, 3-dihydroxy naphthalene-6-sodium sulfonate into de-ionized water, using a sodium bicarbonate solution for regulating the pH value of the system, and finally, obtaining the retanning dyeing auxiliary agents through co-polymerization reaction carried out under the horse radish peroxidase (HRP) catalysis. The invention uses HRP as catalysts of the polymerization reaction, and the HRP has the advantages of high efficiency, high selectivity and environment protection when being used for catalyzing the polymerization. The invention has the advantages that phenols or arylamines can carry out polymerization in ortho positions or para positions of hydroxide groups and amino groups for forming a polymer with directly connected C-C structures and large pi conjugated systems, the formaldehyde pollution in the traditional synthesized retanning agents is avoided, and at the same time, the products with the conjugated systems contain a large number of auxochromic groups such as -NH2, -OH and -SO3H and the like. Retanning leather is full and soft, and the dye absorption rate is higher than 99 percent, and in addition, the retanning dyeing auxiliary agents have obvious dyeing aid effect.

A method for preparing a nanometer composite highly-absorptive chrome tanning additive by combining polycarboxylic copolymer and montmorillonite. The method comprises: dispersing 2-10 g of nanometer montmorillonite with 150-400 g of distilled water, adding 0.5-1.5g of cetyl trimethyl ammonium chloride, and enabling the reaction thereof for 4-6 h at a temperature between 60°C and 95°C, performing ultrasonic processing for 0.5-2 h to obtain modified montmorillonite; dispersing 2-10 g of modified montmorillonite using 150-300 g of water for 2-5 h, adding 15-30 g of methacrylic acid, reacting for 0.5-2 h, performing water bath heating, and at 50-80°C, continuing dripping methacrylic acid and an initiator for 30 min, reacting at a constant temperature for 1-3 h, cooling, discharging, and producing the final product. In the method, a pickling procedure in the conventional chrome tanning process is omitted, so that the exhaustion rate of chrome tanning waste liquid is increased, and an environmentally friendly nanometer composite material is therefore provided.