CN112574829B

CN112574829B - Soaping agent for dyeing cotton fabric by reactive dye and preparation method and application thereof

Info

Publication number: CN112574829B
Application number: CN201910931728.9A
Authority: CN
Inventors: 李政; 刘佳; 李凤艳; 王玉秀; 卢文玉; 巩继贤; 张健飞; 李秋瑾
Original assignee: Tianjin Polytechnic University
Current assignee: Tianjin Polytechnic University
Priority date: 2019-09-29
Filing date: 2019-09-29
Publication date: 2021-11-09
Anticipated expiration: 2039-09-29
Also published as: CN112574829A

Abstract

The invention discloses an environment-friendly soaping agent for dyeing cotton fabrics by reactive dyes, a preparation method and application thereof, belonging to the technical field of textiles. The invention aims to solve the technical problem of providing an application technology of a low-toxicity and environment-friendly biosurfactant sophorolipid on soaping of cotton fabrics dyed by reactive dyes so as to slow down or reduce the pollution of the soaping waste liquid of the cotton fabrics to the environment. The technical scheme of the invention is as follows: the soaping agent comprises the following raw materials in parts by weight: 1-9 parts of sophorolipid, 1-9 parts of anionic surfactant and 1-9 parts of soaping assistant, wherein the anionic surfactant is one of sodium dodecyl benzene sulfonate or rhamnolipid. The soaping fastness and the rubbing fastness of the plants are further effectively improved by the combination of the sophorolipid, the anionic surfactant and the soaping auxiliary agent, and meanwhile, the soaping agent is environment-friendly, biodegradable and wide in application prospect.

Description

Soaping agent for dyeing cotton fabric by reactive dye and preparation method and application thereof

Technical Field

The invention relates to the technical field of spinning, in particular to a soaping agent for dyeing cotton fabrics by using reactive dyes, a preparation method and application thereof.

Background

The reactive dye has the advantages of good color brilliance, complete color spectrum, low cost, etc., and is widely used. However, when reactive dyes are used to dye cellulose fibers, a color bleed is easily formed, which may be caused by the following three points: firstly, when reactive dyes are used for dyeing cellulose fibers, a part of dyes are dyed on fabrics and combined with the fabrics by Van der Waals force, and the other part of dyes are hydrolyzed under the alkaline condition to form hydrolyzed dyes; secondly, if the dye is used too much, the dye is accumulated on the surface of the fabric in the form of a polymolecular layer association, so that only dye molecules at the bottommost layer can react with the cellulose fiber to dye; thirdly, carbon atoms and active chlorine atoms in dye molecules are not easy to freely avoid during the dissociation reaction, and the phenomenon of steric hindrance is easy to generate, so that the fixation rate of the dye is reduced and the floating color is formed again. The reactive dye soaping agent plays an important role in improving the washing fastness of dyed fabrics and removing hydrolyzed dyes from the fabrics. Currently, the soaping agent used in the industry is mainly surfactant and its compound.

The invention discloses CN109989280A patent of invention low temperature soaping agent for cellulose reactive dye, relating to the technical field of textile printing and dyeing, which is compounded by Gemini type anionic sulfonate surfactant and polymer and other auxiliary agents and comprises the following components by weight percent: 1-20% of dialkyl diphenyl ether disulfonic acid sodium salt, 5-15% of anionic surfactant AOT, 0.1-0.5% of defoaming agent, 0.1-5% of beta-cyclodextrin, 0.2-2% of sodium polyacrylate, 1-10% of polyvinylpyrrolidone and the balance of deionized water. The soaping agent has low foam and strong hard water resistance, has obvious effect of soaping off loose color at the low temperature of 60 ℃, saves energy, reduces emission and production cost, and has positive significance for improving the problem of high energy consumption in the printing and dyeing industry.

The invention patent with publication number CN109989280A discloses a low-temperature soaping agent for cellulose reactive dyes, which is prepared by compounding a Gemini type anionic sulfonate surfactant and an auxiliary agent such as a polymer and the like, and comprises the following components in percentage by weight: 1-20% of dialkyl diphenyl ether disulfonic acid sodium salt, 5-15% of anionic surfactant AOT, 0.1-0.5% of defoaming agent, 0.1-5% of beta-cyclodextrin, 0.2-2% of sodium polyacrylate, 1-10% of polyvinylpyrrolidone and the balance of deionized water. The soaping agent has low foam and strong hard water resistance, has obvious effect of soaping off loose color at the low temperature of 60 ℃, saves energy, reduces emission and production cost, and has positive significance for improving the problem of high energy consumption in the printing and dyeing industry.

However, in the prior art, a chemical soaping agent is often added in the soaping process, so that the burden of wastewater treatment is increased, the energy conservation and emission reduction and the environmental protection of dyeing are directly influenced, and the environmental pollution is caused.

Although the prior art discloses soaping agents with biodegradability, a method for preparing a reactive dye printed white stain-resistant soaping agent, such as CN102911807A, is characterized by comprising the following steps: and sequentially adding fatty alcohol-polyoxyethylene ether-9 and water into a compounding kettle, heating to 30-50 ℃, and stirring for 0.5-1 hour to dissolve. B. And C, under the condition of violent stirring, sequentially adding poly-4-hydroxy tetramethylene 1, 2-dicarboxylic acid (CP2), dodecyl dimethyl betaine, ammonium laureth-9 sulfate, carboxymethyl hydroxypropyl cellulose, EDTA disodium salt and sodium metasilicate into the solution obtained in the step A, adding a certain amount of water, and stirring at the temperature of 40-60 ℃ for 0.5-2 hours to obtain the optimized soaping agent product with the activity content of 25%. The soaping agent prepared by the invention has the advantages of excellent cleaning performance, strong anti-contamination capability, good biodegradability, moderate price, safety and environmental protection, and can replace similar products abroad. However, it also uses a soaping agent with a chemical agent as a main component, and the active ingredients are polluting in production.

Disclosure of Invention

The invention aims to solve the technical problem of providing an application technology of a low-toxicity and environment-friendly biosurfactant sophorolipid on soaping of cotton fabrics dyed by reactive dyes so as to slow down or reduce the pollution of the soaping waste liquid of the cotton fabrics to the environment.

The complete technical scheme provided by the invention is as follows: the soaping agent comprises the following raw materials in parts by weight: 1-9 parts of sophorolipid, 1-9 parts of anionic surfactant and 1-9 parts of soaping assistant, wherein the anionic surfactant is one of sodium dodecyl benzene sulfonate or rhamnolipid.

Preferably, the anionic surfactant is sodium dodecyl benzene sulfonate, and the weight ratio of the sophorolipid to the sodium dodecyl benzene sulfonate is 7-9: 1-3.

More preferably, the anionic surfactant is sodium dodecylbenzene sulfonate, and the weight ratio of the sophorolipid to the sodium dodecylbenzene sulfonate is 8: 2.

preferably, the soaping assistant is polyvinylpyrrolidone.

Preferably, the anionic surfactant is sodium dodecylbenzene sulfonate, and the weight ratio of the sophorolipid to the sodium dodecylbenzene sulfonate to the polyvinylpyrrolidone is 7-9: 1-3: 4-6.

More preferably, the anionic surfactant is sodium dodecylbenzene sulfonate, and the weight ratio of the sophorolipid, the sodium dodecylbenzene sulfonate and the polyvinylpyrrolidone is 8:2: 5.

preferably, the anionic surfactant is rhamnolipid, and the weight ratio of the sophorolipid to the rhamnolipid is 1-3: 7-9.

More preferably, the anionic surfactant is a rhamnolipid, the weight ratio of sophorolipid to rhamnolipid being 2: 8.

Preferably, the anionic surfactant is rhamnolipid, and the weight ratio of the sophorolipid to the rhamnolipid to the polyvinylpyrrolidone is 1-3: 7-9: 4-6.

More preferably, the anionic surfactant is rhamnolipid, and the weight ratio of the sophorolipid, rhamnolipid and polyvinylpyrrolidone is 2:8: 5.

the invention also aims to provide a preparation method of the soaping agent, which comprises the following specific steps: the sophorolipid, the anionic surfactant and the soaping assistant are compounded according to the proportion, and the solution is shaken to be uniformly mixed.

Another object of the present invention is to provide the use of the soaping agent described above in a soaping process.

Preferably, the washing process comprises the steps of hot water washing, cold water washing, soaping agent soaping and cold water washing.

Preferably, the total concentration of the soaping agent system is 1.0-5.0 g/L. The total concentration of the soaping agent system can be 1.0 g/L, 1.1g/L, 1.2g/L, 1.3g/L, 1.4g/L, 1.5g/L, 1.6g/L, 1.7g/L, 1.8g/L, 1.9g/L, 2g/L, 2.1g/L, 2.2g/L, 2.3g/L, 2.4g/L, 2.5g/L, 2.6g/L, 2.7g/L, 2.8g/L, 2.9g/L, 3.0g/L, 3.1g/L, 3.2g/L, 3.3g/L, 3.4g/L, 3.5g/L, 3.6g/L, 3.7g/L, 3.8g/L, 3.9g/L, 4.0g/L, 4g/L, 4.4g/L, 4g/L, 4.6g/L, 4g/L, 4.4g/L, 4g/L, 3.9g/L, 4g/L, 3.0g/L, 4g/L, 3.3.0 g/L, 4g/L, 3.0g/L, 4g/L, 3.3.3.3.3.3.3.8 g/L, 4g/L, 3.3.3.3.3.L, 4g/L, 3.3.3.3.3.3.3.3.3.3.3.3.3.3.3.3.3.3.3.3.3.3.3.3.L, 4g/L, 3.3.3.3.3.3.3.3.3.3.3.3.3.3.3.3.3.3.3.3.3.3.3.L, 4g/L, 3.3.3.3.3.3.3 g/L, 4g/L, 3g/L, 4g, 4.5g/L, 4.6g/L, 4.7g/L, 4.8g/L, 4.9g/L, 5.0 g/L.

More preferably, the total concentration of the soaping agent system is 1.5-3.0 g/L.

Preferably, in the soaping step: the soap bath ratio is 1: 10-30.

Preferably, in the soaping step: the soaping time is 15-25min

Preferably, in the soaping step: the soaping temperature is 60-80 DEG C

Preferably, in the hot water washing step, the temperature is 50-60 ℃, the time is 5-10min, and the bath ratio is 1:50-1: 80.

Preferably, in the cold water washing step, the temperature is 20-30 ℃, the time is 5-10min, and the bath ratio is 1:50-1: 80.

Advantageous effects

The chemical soaping agent added in the traditional soaping process increases the burden of wastewater treatment, directly influences the energy conservation and emission reduction and environmental protection of dyeing, and causes environmental pollution. The sophorolipid is obtained by biological fermentation as a soaping agent, has environmental protection from production to application, and can effectively reduce the use of water resources in the production, application and degradation processes.

The sophorolipid selected by the invention has directional adsorption effect on the surface flooding of the fabric, permeates between the flooding and the fiber by reducing the interfacial tension, weakens the adhesive force of the flooding on the fiber, and has better emulsification and dispersion effects. The sophorolipid is a biosurfactant with the most promising application prospect in glycolipid biosurfactants, has extremely low biotoxicity, is environment-friendly and can be biodegraded; is suitable for extreme temperature, pH and salinity; has good biocompatibility and generally does not cause allergy. In recent years, biosurfactant sophorolipid has been widely used in various fields such as daily use chemicals, medicines, environmental engineering, and the like. However, the application of sophorolipid as a soaping agent in the soaping process of dyed cotton fabrics has not been reported.

The method utilizes the sophorolipid as the soaping agent to carry out soaping, utilizes the directional adsorption effect of the soaping agent on the floating color on the surface of the fabric, and has better emulsification and dispersion effects by reducing the interfacial tension, permeating between the floating color and the fiber and weakening the adhesive force of the floating color on the fiber. The sophorolipid has environmental protection property, and its biodegradation is higher than that of conventional soap lotion.

Degradability of sophorolipid: the Chemical Oxygen Demand (COD) of 1g/L sophorolipid is 1655mg/L, and the COD of sodium dodecyl benzene sulfonate with the same concentration is 2685 mg/L. The smaller the COD value, the lower the degree of water pollution, and the better the degradability. When the ratio of BOD to COD is more than 0.3, the biodegradability is good, the BOD/COD of the sophorolipid is 0.44, and the BOD/COD of the sodium dodecyl benzene sulfonate is 0.28, thereby showing that the biodegradability of the sophorolipid is more remarkable.

The compounding of sophorolipid and anionic surfactant is the molecular interaction between nonionic surfactant and ionic surfactant, and mainly the ion-dipole interaction between polarities from the structural point of view. The non-anionic surfactant compound system has three synergistic effects: (1) synergy of micelle forming ability; (2) synergy to reduce surface tension efficiency; (3) synergistic ability to reduce surface tension. The soaping assistant is added into the complex system, and plays a main role in increasing the activity of the complex system, and plays roles in decontamination, dispersion, emulsification and solubilization. (4) The sophorolipid has environmental protection property, and its biodegradation is higher than that of conventional soap lotion.

The sophorolipid and the compound system thereof have the advantages of soaping: sophorolipid first adsorbs to the surface of the fibre and penetrates into the interstices of the fibre, reducing the binding force by reducing the surface tension between the unfixed dye and the hydrolysed dye and the fibre, and then the unfixed dye and the hydrolysed dye are separated from the fibre by mechanical agitation. After the sophorolipid is compounded with the sodium dodecyl benzene sulfonate or the rhamnolipid, the wettability and the emulsibility of the sophorolipid can be effectively improved, the surface activity of the sophorolipid is improved, the original soaping performance can be achieved at a lower concentration, and the soaping auxiliary agent plays a role in preventing contamination and preventing the recombination of flooding and fibers. The combination of the sophorolipid, the anionic surfactant (sodium dodecyl benzene sulfonate or rhamnolipid) and the soaping assistant further effectively improves the soaping fastness and the rubbing fastness of the fabric.

Drawings

FIG. 1 is a view of a dyeing process.

Detailed Description

The invention is described below by means of specific embodiments. Unless otherwise specified, the technical means used in the present invention are well known to those skilled in the art. In addition, the embodiments should be considered illustrative, and not restrictive, of the scope of the invention, which is defined solely by the claims. It will be apparent to those skilled in the art that various changes or modifications in the components and amounts of the materials used in these embodiments can be made without departing from the spirit and scope of the invention. The present invention is further illustrated by the following specific examples.

The dyeing process for the soaped fabric selected in the following experimental examples and examples is as follows:

dyeing prescription: reactive dye red SNE (M type reactive dye, namely, an M type reactive dye with monochlorotriazine and vinyl sulfone double active groups) 2% (owf), sodium chloride 60g/L, soda 15g/L, bath ratio 1:30, dyeing process conditions: the process flow for dyeing cotton fabric by using the reactive dye specifically comprises the following steps: adding the fabric, the dye and the sodium chloride according to the proportion at the room temperature of 25-30 ℃, mixing for 10min, heating to 65 ℃ at the heating rate of 2 ℃/min, heating at the constant temperature for 35min, adding the soda ash, mixing, continuing to heat at the constant temperature of 65 ℃, further treating for 45min, finishing heating, and performing soaping and water washing of the following experimental examples and examples.

The soaping fastness test and the rubbing fastness test methods corresponding to the following examples and experimental examples are as follows:

(1) soaping resistance color fastness test

The soaping color fastness test is carried out on dyed fabrics according to the national standard GB/T3920-. A sample of 100 x 40mm is clamped between two pieces of standard lining fabric of 100 x 40mm and sewn along one short edge. Firstly, a steel tank filled with soap liquid is put into a soaping-resistant color fastness tester with the model of SW-10 for preheating, and after the temperature reaches 40 +/-2 ℃, a sample to be tested is put into the steel pipe, wherein the concentration of the soap flake liquid is 5g/L, and the soaping bath ratio is 1: 50. And (3) fixing the steel tank in a washing fastness tester, mechanically stirring for 30min at 40 ℃, taking out a sample to be tested after soaping, washing and drying. The standard interlining fabric is made of cotton fibers in the first piece and wool fibers in the second piece. The color change of the sample and the staining grade of the lining fabric are evaluated by a gray sample card by taking the original sample and the original standard lining fabric as reference substances.

(2) Colour fastness to rubbing test

And testing the color fastness to rubbing after cleaning dyed fabrics according to the color fastness to rubbing of the textile color fastness test of the national standard GB/T3920-. Two samples 50X 200mm in size were taken and used for the dry friction test and the wet friction test (the water content in the wet friction was 98%). A standard rubbing cotton 50X 50mm was used for the rubbing head.

And (3) determining dry rubbing color fastness: the sample was fixed on a dye rubbing fastness tester platform of type Y571L by a clamping device so that the length direction of the sample was coincident with the running direction of a rubbing head (a cylinder with a diameter of 16 + -0.1 mm). The running speed is 1 reciprocating friction cycle per second, the total friction is 10 cycles, the friction stroke is 104 +/-3 mm, and the downward pressure is 9 +/-0.2N. And after the test is finished, taking down the sample to be tested and the standard friction cotton cloth, and evaluating the staining grade number of the friction cloth by using a grey sample card.

And (3) measuring wet rubbing color fastness: weighing standard friction cotton cloth, completely soaking the standard friction cotton cloth in distilled water, removing excessive water on the cotton cloth by using an adjustable padding liquid device, and weighing the friction cloth again to ensure that the water content of the friction cloth reaches 95-100%. And then testing according to a dry rubbing color fastness testing method, airing the wet rubbing cloth after the test is finished, and finally evaluating the staining grade number of the rubbing cloth by using a gray sample card.

Experimental example 1: effect of time on the soaping Effect of sophorolipid

A soaping process comprises the steps of hot water washing, cold water washing, soaping with a soaping agent and cold water washing.

Wherein the soaping agent is sophorolipid with the mass concentration of 2 g/L.

Wherein, the soaping step of the soaping agent comprises the following steps: the soaping bath ratio is 1:30, and the soaping temperature is 80 ℃.

Wherein in the hot water washing step, the temperature is 55 ℃, the time is 5min, and the bath ratio is 1: 50.

Wherein in the cold water washing step, the temperature is 25 ℃, the time is 5min, and the bath ratio is 1: 50.

Soaping the cotton fabric dyed by the reactive dye according to the soaping method, and grouping according to different soaping time, wherein: the respective soaping times of the experimental groups 1, 2 and 3 are as follows: 15min, 20min and 25 min;

controls 1 and 2 correspond to a soaping time of: 10min and 30min

And (4) measuring the absorbance of the soaping residual liquid, and calculating the dye concentration in the soaping residual liquid according to the standard curve of the reactive dye.

TABLE 1 Effect of time on Sophora lipid soaping Effect

Time (min)	Concentration of soaping residual liquid (mg/L)
		Experimental group 1: 15	15.87
Experimental group 2: 20	17.24
		Experimental group 3: 25	17.60
Control group 1:10	12.48
		Control group 2: 30	17.69

As can be seen from the above table, as the soaping time increases, the concentration of the soaping residual liquid tends to be flat after increasing. When the soaping time is 20min, the sophorolipid achieves a good soaping effect on cotton fabrics.

Experimental example 2: effect of temperature on the soaping Effect of sophorolipid

Wherein the soaping agent is sophorolipid with the mass concentration of 2.0 g/L.

Wherein, the soaping step of the soaping agent comprises the following steps: the soap bath ratio is 1:30, and the soap washing time is 20 min.

Soaping the cotton fabric dyed by the reactive dye according to the soaping method, and grouping according to different soaping temperatures, wherein: the soaping temperatures of the experimental groups 1, 2 and 3 are respectively as follows: 60 ℃, 70 ℃ and 80 ℃;

the corresponding soaping time of the control groups 1 and 2 is as follows: 50 ℃ and 90 DEG C

TABLE 2 Effect of temperature on the soaping effect of sophorolipid

Temperature (. degree.C.)	Concentration of soaping residual liquid (mg/L)
		Experimental group 1:60	7.70
Experimental group 2: 70	11.01
		Experimental group 3: 80	17.29
Control group 1:50	6.87
		Control group 2: 90	17.42

As shown in the table, the influence of the temperature on the soaping effect is large, when the soaping temperature is 50 ℃, the concentration of the soaping residual liquid is 6.87mg/L, and the concentration of the soaping residual liquid at the temperature of 80 ℃ reaches 17.29mg/L, which is almost different from the soaping effect at the temperature of 90 ℃. The reactive dye has high substantivity, is combined with the cotton fiber by the affinity of the reactive dye to the cotton fiber, most of the dye exists in the inner pore canal of the fiber, and a small amount of the dye is attached to the surface of the fiber. The higher the soaping temperature is, the more sufficient the swelling of the fiber is, the diffusion coefficient of the dye can be correspondingly improved, the desorption and the diffusion of the active dye which is not completely fixed in the pore channel in the fiber are facilitated, and the active dye on the fiber surface is removed due to the concentration difference with water and the dispersibility of sophorolipid.

Experimental example 3: influence of Sophorolipid (SL)/Sodium Dodecyl Benzene Sulfonate (SDBS) compound system on soaping effect

Wherein the total concentration of the soaping agent systems of the experimental group and the control group is 2.0 g/L.

Wherein, the soaping step of the soaping agent comprises the following steps: the soap bath ratio is 1:30, the soap time is 20min, and the soap temperature is 80 ℃.

Soaping the cotton fabric dyed by the reactive dye according to the soaping method, and grouping according to different soaping agents, wherein: the experiment groups 1, 2 and 3 respectively show that the weight ratio of sophorolipid to sodium dodecyl benzene sulfonate is as follows: a compound system of 7:3, 8:2 and 9: 1;

the reference group 1 was sodium dodecylbenzenesulfonate;

control group 2 was sophorolipid;

control group 3: sodium lauryl sulfate;

control group 4: the weight ratio of sophorolipid to sodium dodecyl sulfate is: 10: 3 (the preferable proportion of sophorolipid and lauryl sodium sulfate) measuring the absorbance of the soaping residual liquid, and then calculating the dye concentration in the soaping residual liquid according to the standard curve of the active dye. The soaping fastness and rubbing fastness of the soaped fabric were determined.

TABLE 3 influence of SL/SDBS combination on soaping effect

As shown in the table, the soaping effect of SL/SDBS compound systems with different weight ratios on dyed cotton fabrics is different, and the soaping fastness and the rubbing fastness of the cotton fabrics soaped by the compound soaping system with the weight ratio of 8:2 are improved by about 1-2 levels.

Compared with the control group 1, the combined soaping performance of the sophorolipid and the sodium dodecyl benzene sulfonate is obviously higher than that of the sodium dodecyl benzene sulfonate, and the charge repulsion effect formed by the sodium dodecyl benzene sulfonate is weakened by the addition of the nonionic surfactant sophorolipid.

Compared with the control group 2, the combined soaping performance of the sophorolipid and the sodium dodecyl benzene sulfonate is obviously higher than that of the sophorolipid, the steric hindrance of the nonionic sophorolipid is reduced due to the existence of the anionic surfactant sodium dodecyl benzene sulfonate, and the sophorolipid and the sodium dodecyl benzene sulfonate have a synergistic effect.

Meanwhile, compared with the experimental group and the control group 3 and 4, when the sodium dodecyl sulfate is used as the soaping agent, although the property of the soaping agent is similar to that of the sodium dodecyl benzene sulfonate, the combined soaping performance of the sophorolipid and the sodium dodecyl benzene sulfonate is obviously higher than that of the sophorolipid and the sodium dodecyl sulfate in the aspect of soaping function and performance, so that the surface activity of the sophorolipid is obviously improved by the sodium dodecyl benzene sulfonate, and the original soaping performance can be achieved at a lower concentration.

Experimental example 4: soaping effect of SL/RL (rhamnolipid) compound system

Wherein the total concentration of the soaping agent systems of the experimental group and the control group is 2.0 g/L;

Soaping the cotton fabric dyed by the reactive dye according to the soaping method, and grouping according to different soaping agents, wherein: the ratios of sophorolipid to rhamnolipid in experimental groups 1, 2 and 3 were: 3:7, 2:8, 1: 9;

control group 1 was rhamnolipid;

control group 2 was sophorolipid.

And (4) measuring the absorbance of the soaping residual liquid, and calculating the dye concentration in the soaping residual liquid according to the standard curve of the reactive dye. The soaping fastness and rubbing fastness of the soaped fabric were determined.

TABLE 4 influence of SL/RL built-up system on soaping effect

As shown in the table, the soaping effect of SL/RL complex formulation systems with different weight ratios on dyed cotton fabrics is different, and the soaping fastness and the rubbing fastness of the cotton fabrics soaped by the complex formulation soaping system with the weight ratio of 2:8 are improved by about 1-2 levels.

Compared with the control group 1, the combined soaping performance of the sophorolipid and the rhamnolipid is obviously higher than that of the rhamnolipid, the charge repulsion effect formed by the sodium dodecyl benzene sulfonate is weakened by the addition of the sophorolipid, the comprehensive performance of the sophorolipid and the rhamnolipid is improved, and the sophorolipid and the rhamnolipid have a synergistic effect.

Compared with the control group 2, the combined soaping performance of the sophorolipid and the rhamnolipid is obviously higher than that of the sophorolipid, the rhamnolipid has excellent surface activity, the steric hindrance effect of the sophorolipid is reduced due to the existence of the rhamnolipid, and the sophorolipid and the rhamnolipid have a synergistic effect.

Example 1: soaping effect of SL/SDBS/PVP (polyvinylpyrrolidone) compound system

Soaping the cotton fabric dyed by the reactive dye according to the soaping method, and grouping according to different soaping agents, wherein: the experiment groups 1, 2 and 3 respectively have the following weight ratios of sophorolipid, sodium dodecyl benzene sulfonate and polyvinylpyrrolidone: 8:2:4, 8:2:5 and 8:2: 6.

Three soaping agents were simultaneously selected as controls, control 1 being: sodium dodecylbenzenesulfonate;

control group 2 was: soap flakes (product manufacturers: technical supervision of textile industry in Shanghai City);

control group 3 was: the alkyl glycoside, the sodium dodecyl benzene sulfonate and the polyvinylpyrrolidone are mixed according to the weight ratio of 10: 3: 5 (the preferable proportion of alkyl glycoside, sodium dodecyl benzene sulfonate and polyvinylpyrrolidone).

TABLE 5 soaping effect of SL/SDBS/PVP combination System

As can be seen from the above table, the soaping effect of the dyed cotton fabric is improved by adding the soaping assistant polyvinylpyrrolidone (PVP) and the SL/SDBS compound soaping system solution, and the soaping fastness and the rubbing fastness of the cotton fabric soaped by the compound soaping system added with the soaping assistant are improved by about 1-2 levels.

In the comparison between the experimental group and the control group 3, the alkyl glycoside has the same environmental protection property as the sophorolipid, and as a soaping agent, the combined soaping performance of the sophorolipid, the sodium dodecyl benzene sulfonate and the polyvinylpyrrolidone is obviously higher than that of the alkyl glycoside, the sodium dodecyl benzene sulfonate and the polyvinylpyrrolidone in the soaping function and performance. Under the same soaping condition, the alkyl glycoside needs more water for washing, and when the bath ratio reaches 1: at 80, the soaping fastness and the rubbing fastness of the fabric are improved by about 0.5 to 1 grade. The measurement shows that the foaming height of 1g/L sophorolipid is 10.67mm in the soaping process, and the foaming height of 1g/L alkyl glycoside reaches 75mm, so that the foaming property of sophorolipid in the soaping process is lower, the water consumption is lower in the water washing process, and the soaping effect can be achieved at a low water consumption level.

Example 2: soaping effect of SL/SDBS/PVP (polyvinylpyrrolidone) compound system

Wherein the total concentration of the soaping agent system is 1.5 g/L.

Wherein, the soaping step of the soaping agent comprises the following steps: the soap bath ratio is 1:20, the soap time is 25min, and the soap temperature is 70 ℃.

Wherein in the hot water washing step, the temperature is 55 ℃, the time is 5min, and the bath ratio is 1: 55.

Wherein in the cold water washing step, the temperature is 28-30 ℃, the time is 5min, and the bath ratio is 1: 55.

Soaping the cotton fabric dyed by the reactive dye according to the soaping method, and grouping according to different soaping agents, wherein: the weight ratio of sophorolipid, sodium dodecyl benzene sulfonate and polyvinylpyrrolidone is as follows: 8:2: 5;

example 2 is similar to example 1 in the technical effects of soaping residual liquor concentration, soaping fastness and rubbing fastness.

Example 3: soaping effect of SL/RL/PVP (polyvinylpyrrolidone) compound system

Soaping the cotton fabric dyed by the reactive dye according to the soaping method, and grouping according to different soaping agents, wherein: the test groups 1, 2 and 3 respectively have the weight ratio of sophorolipid, rhamnolipid and polyvinylpyrrolidone as follows: 2:8:4, 2:8:5 and 2:8: 6.

Control group 1 was: sodium dodecylbenzenesulfonate;

control group 3 was: the weight ratio of alkyl glycoside to rhamnolipid to polyvinylpyrrolidone is 11: 3: 5 (the preferable proportion of the alkyl glycoside, the rhamnolipid and the polyvinylpyrrolidone).

TABLE 6 soaping effect of SL/RL/PVP combination System

As can be seen from the above table, after the soaping assistant polyvinyl pyrrolidone (PVP) is added, the soaping effect of the SL/RL complex soaping system solution on dyed cotton fabrics is improved, and the soaping fastness and the rubbing fastness of cotton fabrics soaped by the complex soaping system added with the soaping assistant are improved by about 0.5-1 level.

Example 4: soaping effect of SL/RL/PVP (polyvinylpyrrolidone) compound system

Wherein, the soaping agent is a complex system of sophorolipid, rhamnolipid and polyvinylpyrrolidone, wherein the weight ratio of sophorolipid, rhamnolipid and polyvinylpyrrolidone is as follows: 2:8: 5; wherein the total concentration of the soaping agent system is 2.5 g/L.

Wherein, the soaping step of the soaping agent comprises the following steps: the soaping bath ratio is 1:20, the soaping time is 25min, and the soaping temperature is 60 ℃.

Wherein in the hot water washing step, the temperature is 50 ℃, the time is 5min, and the bath ratio is 1: 60.

Wherein in the cold water washing step, the temperature is 25 ℃, the time is 5min, and the bath ratio is 1: 60.

Example 4 is similar to example 3 in the technical effects of soaping residual liquor concentration, soaping fastness and rubbing fastness.

Claims

1. A soaping agent characterized by: the soaping agent comprises the following raw materials in parts by weight: 1-9 parts of sophorolipid, 1-9 parts of anionic surfactant and 1-9 parts of soaping assistant, wherein the anionic surfactant is one of sodium dodecyl benzene sulfonate or rhamnolipid, the soaping assistant is polyvinylpyrrolidone, and when the anionic surfactant is sodium dodecyl benzene sulfonate, the weight ratio of the sophorolipid to the sodium dodecyl benzene sulfonate to the polyvinylpyrrolidone is 7-9: 1-3: 4-6, when the anionic surfactant is rhamnolipid, the weight ratio of the sophorolipid, rhamnolipid and polyvinylpyrrolidone is 1-3: 7-9: 4-6.

2. The soaping agent of claim 1, wherein: the anionic surfactant is sodium dodecyl benzene sulfonate, and the weight ratio of the sophorolipid to the sodium dodecyl benzene sulfonate to the polyvinylpyrrolidone is 8:2: 5.

3. the soaping agent of claim 1, wherein: the anionic surfactant is rhamnolipid, and the weight ratio of the sophorolipid to the rhamnolipid to the polyvinylpyrrolidone is 2:8: 5.

4. a process for the preparation of a soaping agent according to any one of claims 1 to 3, characterized in that: the sophorolipid, the anionic surfactant and the soaping assistant are compounded according to the proportion, and the solution is shaken to be uniformly mixed.

5. Use of a soaping agent according to any one of claims 1-3 in a soaping process.

6. Use of a soaping agent according to claim 5 in a soaping process, wherein: the soaping process comprises hot water washing, cold water washing, soaping with a soaping agent and cold water washing.

7. Use of a soaping agent according to claim 6 in a soaping process, wherein: the soaping step of the soaping agent comprises the following steps: the total concentration of the soaping agent system is 1.0-5.0 g/L; the soaping bath ratio is 1:10-30, the soaping time is 15-25min, and the soaping temperature is 60-80 ℃;

in the hot water washing step, the temperature is 50-60 ℃, the time is 5-10min, and the bath ratio is 1:50-1: 80;

in the cold water washing step, the temperature is 20-30 ℃, the time is 5-10min, and the bath ratio is 1:50-1: 80.