58results about How to "Increase K/S value" patented technology

The invention relates to the field of textile dye staining technology, in particular to a cotton fiber based non-reactive type modified natural dye staining method. The staining method mainly comprises the steps of pretreatment of a cotton fabric, non-reactive type modified treatment of the cotton fabric and staining treatment of the modified cotton fabric, wherein cationic compound modifier is adopted to modify the cotton fabric in the step of the non-reactive type modified treatment of the cotton fabric, so that the modified cotton fabric can still have good whiteness, high strength and good moisture absorption performance; and the K/S value of the stained cotton fabric can be greatly improved, and good leveling property and color fastness are achieved.

The invention discloses a modified sodium alginate paste material, and relates to the technical field of printing and dyeing, wherein the modified sodium alginate paste material includes the followingingredients in parts by weight: 25-35 parts of sodium alginate, 75-100 parts of crosslinked carboxymethyl starch, 5-10 parts of urea, 3-5 parts of sodium hydrogen carbonate, 10-12 parts of guar gum,8-10 parts of bentonite, 12-15 parts of carboxymethylcellulose, 5-8 parts of sodium polyacrylate, 5-8 parts of a mildew-proof antibacterial agent, and the balance water. The modified sodium alginate paste material can improve the storage stability and increase a printing quality.

The invention relates to an active-dye low-salt dip dyeing method for cotton fabric. A one-step process employed by the technology is excellent in dyeing effect, and in the one-step process technology, a salt substitute is applied to a pretreatment technology, pretreatment does not need individually performing, and the processing process is shortened and water and energy are saved. Also, BOD5 and CODCr of a processing raffinate of the one-step process technology are reduced compared with routine pretreatment, and the one-step process technology is environment-friendly. The low-salt dyeing technology is capable of reducing the usage amount of anhydrous sodium sulfate in the dyeing process by 50%, is excellent in dyeing effect, has the dyed fabric K/S value higher than that of a routine dyeing technology, and is uniform in obtained color. The soaping fastness and the perspiration fastness are both high and are both 4-5 grade or more, the solarization fastness is 4 grade or more, and the dry/wet friction fastness is 4 grade or more. The improving capacity of the low-salt dyeing technology is better than that of a routine dyeing technology, in other words, the usage amount of a dye is less when same chroma is obtained, and the dye uptake of the low-salt dyeing technology is far higher than that of a routine dyeing technology.

The invention discloses a dyeing promoter for reactive dye. The dyeing promoter comprises ethylenediaminetetraacetic acid ionic salt, specifically at least one of ethylenediaminetetraacetic acid tetrasodium salt, ethylenediaminetetraacetic acid disodium salt, dipotassium ethylene diamine tetraacetate, tripotassium ethylenediaminetetraacetic acid, ethylenediaminetetraacetic acid dilithium salt, ethylenediaminetetraacetic acid calcium disodium salt, ethylenediaminetetraacetic acid disodium zinc salt tetrahydrate and ethylenediaminetetraacetic acid ammonium salt. The invention further discloses a using method of the dyeing promoter. According to the method, the ethylenediaminetetraacetic acid ionic salt is adopted as the dyeing promoter of inorganic salt, the dye-uptake and fixation rate of reactive dyeing can be remarkably improved, the use amount of dyeing promoter neutral inorganic salt can be reduced, traditional reactive dyeing equipment is not required to be transformed, and dyeing technical parameters of various reactive dyes are not changed, so that the environment-friendly effect is improved, the production cost is reduced, and the environment-friendly low-salt reactive dyeing is realized.

The invention relates to a low-salt dyeing method of a reactive dye. The dyeing method does not change the conventional dyeing equipment and basic dyeing process of cotton textiles, and is easy to implement and control. Compared with a traditional dyeing method of a reactive dye to cotton textiles, the dyeing method can reduce the dosage of a dyeing electrolyte by 50% or above, and the cotton textile dyed by adopting the low-salt dyeing method of the reactive dye disclosed by the invention has obviously higher color rendering depth, high dyeing fastness and excellent dyeing reproducibility, and can be used for reactive dye dyeing processing of various cotton fibers and products thereof, so that the use amount of the dyeing electrolyte is remarkably reduced, the environment is protected, and the dyeing method has good application effect and bright market prospect.

The invention relates to the field of textile printing and dyeing, and discloses a method for improving the dye-uptake of direct dyes on cotton fabrics. The method comprises the following steps that (1) the cotton fabrics are treated by a chitosan solution, specifically, the pretreated cotton fabrics are completely immersed in the chitosan solution, then an excess solution is rolled out, pre-roasting is conducted, heating and solidifying are conducted, then washing is conducted in a weakly acidic solution, and then drying is conducted; and (2) dyeing is conducted, specifically, the treated cotton fabrics obtained in step (1) are placed in a direction dye solution for stirring, then heating and heat preservation are conducted, and the cotton fabrics are soaped and dried; wherein in the step(1), the preparation method of the chitosan solution comprises the steps that chitosan is dissolved in a citric acid solution with the concentration of 40-50 g/L; and the concentration of the chitosan solution is 10-15 g/L. According to the method, citric acid is used as a crosslinking agent, the chitosan is crosslinked on the cotton fabrics, and the dye-uptake of the direct dyes on the cotton fabrics is improved.

The invention provides a preparation method of catechin-containing ramie large biofiber, and relates to the technical field of functional fiber processing. According to the method, firstly, ramie fiber is treated with alkali, cleaned and oxidized, and then the ramie fiber is modified with microencapsulated catechin, so that the combining capacity of the catechin and the ramie fiber is improved, and the ramie large biofiber with the good antiviral function is produced. The large biofiber prepared by the method not only has the antiviral function, but also improves the washing color fastness of the ramie fiber.