CN-117431762-B - Dyeing method of natural-color polyurethane sponge based on medicinal plants

CN117431762BCN 117431762 BCN117431762 BCN 117431762BCN-117431762-B

Abstract

The invention discloses a dyeing method of natural-color polyurethane sponge based on medicinal plants, and relates to the technical field of polyurethane sponge dyeing. The dyeing process includes the steps of preparing material, extracting madder pigment with impurity eliminating extraction process, adding alum to avoid residual in the dye liquid, eliminating impurity, and dyeing in controlled dyeing temperature, time and pH value. The invention has the advantages that the natural dyeing of medicinal plants is carried out on the polyurethane sponge by utilizing the madder to extract pigment, the dyeing liquid with specific proportion and specific dyeing temperature and time are adopted, the polyurethane has good dyeing effect and high color fastness, the dyed polyurethane sponge is environment-friendly, safer to use and brighter in color, the reversible color change of the dyed sponge can be utilized to indicate the recovery condition of wounds of users when the polyurethane sponge is used in the medical field, the polyurethane sponge can also be used for monitoring the acid-base property of environments such as water quality and soil, can be repeatedly used, and cannot pollute the environment.

Inventors

NI ZHANGGEN
ZHANG RUIPING
CUI HUIMING
LIN TAO
XU MENG

Assignees

梦百合家居科技股份有限公司

Dates

Publication Date: 20260508
Application Date: 20231127

Claims (3)

1. S1, preparing polyurethane sponge to be dyed, madder, disodium hydrogen phosphate dodecahydrate, citric acid monohydrate and aluminum potassium sulfate, wherein the disodium hydrogen phosphate dodecahydrate, the citric acid monohydrate and the aluminum potassium sulfate are all analytically pure; S2, extracting madder pigment, namely firstly adding 10g of madder into an acid solution with the pH of 1-2, immersing the madder in the acid solution, then refluxing and boiling the immersed solution for 30-60 minutes, filtering to remove filtrate, adding water into filter residues to 100mL, refluxing and boiling for 30-60 minutes, filtering to remove filter residues, regulating the pH of the filtrate to be neutral, adding 1-2 g/L of alum, standing for 1-2 hours at normal temperature, evaporating water by a rotary evaporator, and drying at 80 ℃, wherein the acid solution is one of sulfuric acid aqueous solution, hydrochloric acid aqueous solution, nitric acid aqueous solution or phosphoric acid aqueous solution, and the dosage of the acid solution is 100mL; S3, preparing dye liquor, namely adjusting the pH value of disodium hydrogen phosphate dodecahydrate and citric acid monohydrate buffer solution to 4-8, wherein the using amount of the madder pigment prepared by adopting the S2 is 2-5% o.w.f, and the bath ratio is 1:100; S4, dyeing the polyurethane sponge, wherein the dyeing temperature is controlled to be 80-120 ℃, the dyeing time is controlled to be 15-30 min, and the dyeing is performed under the condition that the pH value is controlled to be 4-8; s5, washing the dyed polyurethane sponge with water, and then soaping the polyurethane sponge after washing with water; The water washing temperature of the polyurethane sponge is 40-50 ℃ and the water washing time is 20-30min; The soaping condition is that the soap flake is 5g/L, the bath ratio is 1:50, the soaping temperature is 60 ℃, the soaping time is 10min, and the floating color is removed by soaping; s6, washing and drying the soaped polyurethane sponge.
2. The method for dyeing natural color polyurethane sponge based on medicinal plants according to claim 1, wherein in the step S6, the polyurethane sponge is dehydrated and then dried after being washed with water, the drying temperature is 80-100 ℃, and the drying time is 5-10min.
3. The method for dyeing natural color polyurethane sponge according to claim 1, wherein the dyeing temperature is 110 ℃ and the dyeing time is 30min in the step S4.

Description

Dyeing method of natural-color polyurethane sponge based on medicinal plants Technical Field The invention relates to the technical field of polyurethane sponge dyeing, in particular to a dyeing method of natural-color polyurethane sponge based on medicinal plants. Background The polyurethane sponge is prepared by polymerizing and foaming isocyanate and hydroxyl compound. Polyurethane sponge commodity has the characteristics of symmetrical cells, good glossiness and the like, and is widely applied to the industries of high-grade vehicle interior trim, high-end composite materials, printer consumables, filtration, medical treatment and the like. Most of the color polyurethane sponges currently use chemical dyes or pigments, and some dyes have unsafety such as carcinogenic effect. With the improvement of living standard, people pay more attention to living quality and physical health, and for polyurethane sponge products, the safety requirements on human skin and health are higher, and people have allergy and safety concerns on chemical dyes. At present, no document for dyeing polyurethane sponge state by using natural dye is known. The polyurethane sponge dyed by the general dye has only one color, and in some special fields such as medical fields, the specific recovery condition of the injury of a user is required to be judged through the color change of the sponge when the sponge is used, the use cannot be realized by the existing dyed polyurethane sponge, the color fastness of the existing dyed polyurethane sponge is poor, and the use is easy to fade. Therefore, the natural color polyurethane sponge needs to be developed, so that the natural color polyurethane sponge has the characteristic of color change after dyeing, is safe and harmless, and has high color fastness. Disclosure of Invention The invention aims to solve the technical problems of unsafe property, poor color fastness and no color change characteristic after dyeing of polyurethane sponge in the prior art by providing a dyeing method of natural-color polyurethane sponge based on medicinal plants. S1, preparing polyurethane sponge to be dyed, radix rubiae, disodium hydrogen phosphate dodecahydrate, citric acid monohydrate and aluminum potassium sulfate, wherein the disodium hydrogen phosphate dodecahydrate, the citric acid monohydrate and the aluminum potassium sulfate are all analytically pure; S2, extracting madder pigment, namely firstly adding 10g of madder into an acid solution with the pH of 1-2, immersing the madder in the acid solution, then refluxing and boiling the immersed solution for 30-60 minutes, filtering the immersed solution, adding water into the filter residue to 100ML, refluxing and boiling for 30-60 minutes, filtering the solution, removing the filter residue, regulating the pH of the filter residue to be neutral, adding 1-2 g/L of alum, standing for 1-2 hours at normal temperature, evaporating water by a rotary evaporator, and drying at 80 ℃, wherein the acid solution is one of sulfuric acid aqueous solution, hydrochloric acid aqueous solution, nitric acid aqueous solution or phosphoric acid aqueous solution, and the dosage of the acid solution is 100ML; S3, preparing dye liquor, namely adjusting the PH of disodium hydrogen phosphate dodecahydrate and citric acid monohydrate buffer solution to 4-8, wherein the using amount of the madder pigment prepared by adopting the S2 is 2-5% o.w.f, and the bath ratio is 1:100; S4, dyeing the polyurethane sponge, wherein the dyeing temperature is controlled to be 80-120 ℃, the dyeing time is controlled to be 15-30 min, and the dyeing is performed under the condition that the PH value is controlled to be 4-8; s5, washing the dyed polyurethane sponge with water, and then soaping the polyurethane sponge after washing with water; s6, washing and drying the soaped polyurethane sponge. Further, in the step S5, the washing temperature of the polyurethane sponge is 40-50 ℃ and the washing time is 20-30min; the soaping condition is that the soap flake is neutral and 5g/L, the bath ratio is 1:50, the soaping temperature is 60 ℃, the soaping time is 10min, and the floating color is removed by soaping. Further, in the step S6, the polyurethane sponge is dehydrated and then dried after being washed with water, the drying temperature is 80-100 ℃, and the drying time is 5-10min. Further, in the step S4, the dyeing temperature is 110 ℃ and the dyeing time is 30min. The invention has the advantages that the natural dyeing of medicinal plants is carried out on the polyurethane sponge by utilizing the madder to extract pigment, the dyeing liquid with specific proportion and specific dyeing temperature and time are adopted, the polyurethane has good dyeing effect and high color fastness, and the dyed polyurethane sponge is environment-friendly, safer to use and brighter in color; the method for extracting the madder pigment adopts a impurity removal extraction method, alum is added in the extraction pro