CN111519450A - Alkali-free pretreatment slurry for wet transfer printing of wool fabric and printing process - Google Patents

Abstract

The invention relates to the technical field of sizing agent, in particular to alkali-free pretreatment sizing agent for wet transfer printing of wool fabric and a printing process. An alkali-free pretreatment slurry for wet transfer printing of wool fabrics is characterized in that: the alkali-free pretreatment slurry comprises the following components: 0.3-50% of macromolecular compound, 0-20% of cationic compound, 0.1-10% of surfactant, 0-10% of chelating agent, 0-30% of film-forming agent, 0-10% of crosslinking initiator, 0-8% of moisturizing compound and the balance of water, wherein the sum of the contents of all the components is 100%; the printing process comprises the following steps: s1, preparing slurry; s2, sizing; s3, wet transfer printing; s4, steaming; and S5, washing with water, S6 and drying. Compared with the prior art, the pretreatment slurry is suitable for a wet transfer printing process using a reactive dye for wool and an acid dye, the finally obtained wool printed fabric has higher color yield, the overall definition and color fastness of the pattern contour are improved, and good fabric hand feeling is ensured.

Description

Alkali-free pretreatment slurry for wet transfer printing of wool fabric and printing process

Technical Field

The invention relates to the technical field of sizing agent, in particular to alkali-free pretreatment sizing agent for wet transfer printing of wool fabric and a printing process.

Background

Transfer printing is used as a novel dry printing process without liquid phase medium, not only saves energy and water, but also has the advantages of fine pattern, high artistry, clear level, strong stereoscopic impression, less pollution and the like.

The dyes currently used in the wet transfer printing process for wool include reactive dyes and acid dyes. Due to the self structure of the acid dye and other reasons, the problems of low color yield, non-bright color, poor integral definition of pattern outline, poor color fastness and the like can be caused in use; before the reactive dye is used, pretreatment slurry is needed to pretreat wool fabrics, but the current pretreatment slurry contains a certain alkali agent, the wool fabrics are possibly damaged by the acid-alkali agent and steaming treatment in the printing process, the damaged wool is easy to yellow and has a rough and hard hand feeling, and the printing effect and the service performance of the wool fabrics are influenced, for example, Chinese patent application No. 201810883590.5.

Disclosure of Invention

The invention provides alkali-free pretreatment slurry for wet transfer printing of wool fabrics and a printing process, aiming at overcoming the defects of the prior art.

In order to realize the purpose, the alkali-free pretreatment size for the wet transfer printing of the wool fabric is designed, and is characterized in that: the alkali-free pretreatment slurry comprises the following components: 0.3-50% of macromolecular compound, 0-20% of cationic compound, 0.1-10% of surfactant, 0-10% of chelating agent, 0-30% of film-forming agent, 0-10% of crosslinking initiator, 0-8% of moisturizing compound and the balance of water, wherein the sum of the contents of all the components is 100%;

the printing process comprises the following steps: s1, preparing slurry; s2, sizing; s3, wet transfer printing; s4, steaming; and S5, washing with water, S6 and drying.

The cationic compound can be one or more of quaternary ammonium salt compound, chitin, cationic organosilicon and cationic polyacrylamide.

The film forming agent is one or more of waterborne polyurethane, EVA emulsion, PVA and fluorocarbon.

The crosslinking initiator is one or more of isocyanate, melamine, ammonium persulfate and peroxide.

The high molecular compound is one or more of natural high molecular compound and synthetic high molecular compound; the natural polymer compound is one or more of sodium alginate, dragon gum, guar gum, gelatin, CMC, gum arabic powder and beta-cyclodextrin; the synthetic high molecular compound is one or more of polyacrylate compound, polymethacrylate compound and polyacrylamide.

The surfactant is one or more of AEO-3, AEO-5, AEO-6, AEO-7, AEO-9, AEO-10, TX-4, TX-5, TX-7, TX-9, TX-10, TX-12, TX-13, TX-15, TX-18, TX-21, TX-30, SPAN-20, SPAN-40, SPAN-60, SPAN-80, SPAN-85, TWEEN-20, TWEEN-40, TWEEN-60, TWEEN-80, isotridecyl alcohol ether, peregal O, LAS, AES, SDBS and JFC.

The chelating agent is one or more of HEDP, EDTA, PBTC, PAA, DTPMP and PASP.

The moisturizing compound is one or more of glycerol, butanol, chitosan, hyaluronic acid, xylitol or urea.

The alkali-free pretreatment slurry comprises the following components: 5% of sodium alginate, 10% of T-8055, 5% of AEO-5, 3% of EDTA, 8% of waterborne polyurethane, 0.3% of isocyanate and 68.7% of water.

The specific method of step S1 is as follows: s11 paste melting: adding a macromolecular compound into half of water, stirring, and standing until the mixture is uniformly mixed; s12, adding water: adding the residual water content into a material melting barrel, adding the melted paste, and stirring until the mixture is uniformly mixed; s13, adding a cationic compound: adding a cationic compound under stirring; s14, adding a surfactant: adding a surfactant under stirring; s15, adding a chelating agent: adding a chelating agent under stirring; s16, adding a film forming agent and a crosslinking initiator: adding the film forming agent and the crosslinking initiator under the stirring state, and stirring until all the components are uniformly mixed;

the specific method of step S2 is as follows: setting the process as one soaking and one rolling, the pressure is 1-16KG, the liquid carrying rate is 10% -100%, and the wet wool fabric is obtained;

the specific method of step S3 is as follows: s31, attaching the wetted wool fabric and the printing paper or the printing film together, and then rolling the wool fabric and the printing paper or the printing film in a transfer printing device, wherein the running speed is 5-35 m/min, and the transfer printing pressure is 0.5-5 MPa, so that the patterns on the printing paper or the printing film are clearly transferred to the surface of the wool fabric; s32, separating the wool fabric printed with patterns from the printing paper or the printing film after the wool fabric is discharged from the transfer printing device;

the specific method of step S4 is as follows: introducing the wool fabric printed with the pattern into a continuous steamer, steaming for 30-90min at 100-105 ℃ saturated steam, and steaming for color development;

the specific method of step S5 is as follows: soaking the wool fabric in cold water after leaving the steamer, then washing with hot water for 10min, soaping for 1min, and washing with warm water for 5 min;

the specific method of step S6 is as follows: and drying and shaping the washed wool fabric.

Compared with the prior art, the pretreatment slurry is suitable for a wet transfer printing process using a reactive dye for wool and an acid dye, the finally obtained wool printed fabric has higher color yield, the overall definition and color fastness of the pattern contour are improved, and good fabric hand feeling is ensured.

Detailed Description

Example 1:

the wool fabric comprises wool knitted fabric, wool woven fabric, wool carpet, wool non-woven fabric and wool woolen cloth, wherein the wool fabric is made of the wool woolen cloth, and the wet-conversion printing and dyeing material is made of reactive dye for wool.

The alkali-free pretreatment slurry consists of the following components: 5% of sodium alginate, 10% of T-8055, 5% of AEO-5, 3% of EDTA, 8% of waterborne polyurethane, 0.3% of isocyanate and 68.7% of water.

The process for treating wool fabric by using the alkali-free pretreatment slurry and performing wet transfer printing comprises the following steps:

s1, preparing slurry: s11 paste melting: adding sodium alginate into half of water, stirring, and standing to mix well; s12, adding water: adding the residual water content into a material melting barrel, adding the melted paste, and stirring until the mixture is uniformly mixed; s13, adding a cationic compound: adding T-8055 under stirring; s14, adding a surfactant: adding AEO-5 under stirring; s15, adding a chelating agent: adding EDTA under stirring; s16, adding a film forming agent and a crosslinking initiator: adding waterborne polyurethane and isocyanate under stirring, and stirring until all components are uniformly mixed;

s2, sizing: setting the process as one soaking and one rolling, wherein the pressure is 3KG, the liquid carrying rate is 100 percent, and the wet wool fabric is obtained;

s3, wet transfer printing: s31, the wetted wool fabric is attached to the printing paper or the printing film, and the wool fabric and the printing paper or the printing film are rolled and pressed in a transfer printing device, the running speed is 25m/min, and the transfer printing pressure is 5MPa, so that the patterns on the printing paper or the printing film are clearly transferred to the surface of the wool fabric; s32, separating the wool fabric printed with patterns from the printing paper or the printing film after the wool fabric is discharged from the transfer printing device;

s4, steaming: introducing the wool fabric printed with the patterns into a continuous steamer, steaming for 60min under 105 ℃ saturated steam, and steaming and coloring;

s5, washing: soaking the wool fabric in cold water after leaving the steamer, then washing with hot water for 10min, soaping for 1min, and washing with warm water for 5 min;

s6, drying: and drying and shaping the washed wool fabric.

In the prior art, inorganic salt and inorganic base are added into wool pretreatment slurry to solve the problems of color yield and color fastness of wool fabrics, but the problems cannot be solved by using the inorganic salt and the inorganic base in a wool wet transfer printing process, and the final effect of the wool fabrics is greatly influenced by subsequent printing processes such as printing, steaming, washing and the like, so that the performance of the wool fabrics is damaged. The alkali-free pretreatment size can not damage wool fabrics, solves the problems of color yield and color fastness of the wool fabrics, and ensures the performance of the wool fabrics because the wool fabrics treated by the alkali-free pretreatment size are less influenced by a subsequent printing process.

According to the invention, the cationic compound is added into the pretreatment slurry, so that the color yield and color fastness of the printed wool fabric are improved; the film forming agent is added to improve the definition, color fastness and dye transfer rate of a printing profile; the crosslinking initiator is added to catalyze the film forming reaction of the film forming agent; the surfactant is added to provide certain permeability and ensure the printing uniformity; the chelating agent is added to chelate impurities in the wool, so that the color vividness of the printing is improved.

Example 2:

the wool fabric of this embodiment selects the wool woollen, and the wet-conversion printing and dyeing material selects the reactive dye for wool.

The alkali-free pretreatment slurry consists of the following components: 2% CMC, 2% JFC, 4% PBTC, 10% PVA, 0.2% ammonium persulfate, and 81.8% water.

The process for treating wool fabric by using the alkali-free pretreatment slurry and performing wet transfer printing comprises the following steps:

s1, preparing slurry: s11 paste melting: adding CMC into half of the water, stirring and then placing until the CMC is uniformly mixed; s12, adding water: adding the residual water content into a material melting barrel, adding the melted paste, and stirring until the mixture is uniformly mixed; s13, adding a surfactant: adding JFC under stirring; s14, adding a chelating agent: adding PBTC under stirring; s15, adding a film forming agent and a crosslinking initiator: adding PVA and ammonium persulfate under stirring, and stirring until all components are uniformly mixed;

s2, sizing: setting the process as one soaking and one rolling, wherein the pressure is 1KG, the liquid carrying rate is 100 percent, and the wet wool fabric is obtained;

s3, wet transfer printing: s31, the wetted wool fabric is adhered to the printing paper or the printing film, and the wool fabric and the printing paper or the printing film are rolled and pressed in a transfer printing device, the running speed is 15m/min, and the transfer printing pressure is 2MPa, so that the patterns on the printing paper or the printing film are clearly transferred to the surface of the wool fabric; s32, separating the wool fabric printed with patterns from the printing paper or the printing film after the wool fabric is discharged from the transfer printing device;

s4, steaming: introducing the wool fabric printed with the patterns into a continuous steamer, steaming for 70min under saturated steam at 100 ℃, and steaming for color development;

s5, washing: soaking the wool fabric in cold water after leaving the steamer, then washing with hot water for 10min, soaping for 1min, and washing with warm water for 5 min; s6, drying: and drying and shaping the washed wool fabric.

Example 3:

the wool fabric of this embodiment selects the wool woollen, and the wet-conversion printing and dyeing material selects the reactive dye for wool.

The alkali-free pretreatment slurry consists of the following components: 1% of beta-cyclodextrin, 5% of TG-570, 1% of 1306, 20% of 2099, 2% of cross-linking agent E and 71% of water.

The process for treating wool fabric by using the alkali-free pretreatment slurry and performing wet transfer printing comprises the following steps:

s1, preparing slurry: s11 paste melting: adding beta-cyclodextrin into half of water, stirring, and standing until the mixture is uniformly mixed; s12, adding water: adding the residual water content into a material melting barrel, adding the melted paste, and stirring until the mixture is uniformly mixed; s13, adding a cationic compound: adding TG-570 into the mixture under the stirring state; s14, adding a surfactant: adding 1306 under stirring; s15, adding a film forming agent and a crosslinking initiator: adding 2099 and the cross-linking agent E under stirring, and stirring until the components are uniformly mixed;

s2, sizing: setting the process as one soaking and one rolling, the pressure is 5KG, the liquid carrying rate is 90%, and obtaining the wet wool fabric;

s3, wet transfer printing: s31, the wetted wool fabric is adhered to the printing paper or the printing film, and the wool fabric and the printing paper or the printing film are rolled and pressed in a transfer printing device, the running speed is 5m/min, and the transfer printing pressure is 0.5MPa, so that the patterns on the printing paper or the printing film are clearly transferred to the surface of the wool fabric; s32, separating the wool fabric printed with patterns from the printing paper or the printing film after the wool fabric is discharged from the transfer printing device;

s4, steaming: introducing the wool fabric printed with the patterns into a continuous steamer, steaming for 90min under 105 ℃ saturated steam, and steaming and coloring;

s5, washing: soaking the wool fabric in cold water after leaving the steamer, then washing with hot water for 10min, soaping for 1min, and washing with warm water for 5 min;

s6, drying: and drying and shaping the washed wool fabric.

Example 4:

the wool fabric of this embodiment selects the wool woollen, and the wet-conversion printing and dyeing material selects the reactive dye for wool.

The alkali-free pretreatment slurry consists of the following components: 3% of WF, 3% of GM-03, 1% of AES, 3% of EDTA and 90% of water.

The process for treating wool fabric by using the alkali-free pretreatment slurry and performing wet transfer printing comprises the following steps:

s1, preparing slurry: s11 paste melting: adding WF into half of the water, stirring and then placing until the mixture is uniformly mixed; s12, adding water: adding the residual water content into a material melting barrel, adding the melted paste, and stirring until the mixture is uniformly mixed; s13, adding a cationic compound: adding GM-03 under stirring; s14, adding a surfactant: adding AES under stirring; s15, adding a chelating agent: adding EDTA under stirring, and stirring until the components are uniformly mixed;

s2, sizing: setting the process as one soaking and one rolling, the pressure is 10KG, the liquid carrying rate is 80%, and obtaining the wet wool fabric;

s3, wet transfer printing: s31, the wetted wool fabric is adhered to the printing paper or the printing film, and the wool fabric and the printing paper or the printing film are rolled and pressed in a transfer printing device, the running speed is 35m/min, and the transfer printing pressure is 5MPa, so that the patterns on the printing paper or the printing film are clearly transferred to the surface of the wool fabric; s32, separating the wool fabric printed with patterns from the printing paper or the printing film after the wool fabric is discharged from the transfer printing device;

s4, steaming: introducing the wool fabric printed with the patterns into a continuous steamer, steaming for 30min under saturated steam at 100 ℃, and steaming and color development;

s5, washing: washing the wool fabric with hot water for 10min, soaping for 1min, and washing with warm water for 5 min;

s6, drying: and drying and shaping the washed wool fabric.

The printed fabrics obtained in examples 1 to 4 were examined and the results obtained were compared to the following table 1:

TABLE 1

And (4) conclusion:

in the composition of the alkali-free pretreated slurry, compared with example 1, example 2 does not contain a cationic compound, example 3 does not contain a chelating agent, and example 4 does not contain a film-forming agent and a crosslinking initiator. From the results in the above table, it can be seen that the base colors (i.e., red, yellow, blue, black) printed in example 1 are the best in color yield and fastness, dye transfer rate, and definition of the outline. The printed fabric obtained in example 3, which did not contain a chelating agent, was inferior in color fastness, and the printed fabric obtained by treating the wool fabric with the pretreatment slurry containing no cationic compound was inferior in color fastness, and the printed fabric obtained by treating the wool fabric with the pretreatment slurry containing no film-forming agent and no crosslinking initiator was inferior in color fastness, definition of profile, and dye transfer rate.

Example 5:

the wool fabric of the embodiment is a wool knitted fabric, and the wet-conversion printing and dyeing material is a reactive dye.

The alkali-free pretreatment slurry consists of the following components: 0.6% of a high molecular compound: guar gum, 2% cationic compound: chitin, 9% surfactant: LAS, 0.3% chelating agent: PAA, 3% film-forming agent: 2020. 0.2% of crosslinking initiator: melamine, 84.9% water.

The process for treating wool fabric by using the alkali-free pretreatment slurry and performing wet transfer printing comprises the following steps:

s1, preparing slurry: s11 paste melting: adding a macromolecular compound into half of water, stirring, and standing until the mixture is uniformly mixed; s12, adding water: adding the residual water content into a material melting barrel, adding the melted paste, and stirring until the mixture is uniformly mixed; s13, adding a cationic compound: adding a cationic compound under stirring; s14, adding a surfactant: adding a surfactant under stirring; s15, adding a chelating agent: adding a chelating agent under stirring; s16, adding a film forming agent and a crosslinking initiator: adding the film forming agent and the crosslinking initiator under the stirring state, and stirring until all the components are uniformly mixed;

s2, sizing: setting the process as one soaking and one rolling, wherein the pressure is 3KG, the liquid carrying rate is 100 percent, and the wet wool fabric is obtained;

s3, wet transfer printing: s31, the wetted wool fabric is attached to the printing paper or the printing film, and the wool fabric and the printing paper or the printing film are rolled and pressed in a transfer printing device, the running speed is 25m/min, and the transfer printing pressure is 5MPa, so that the patterns on the printing paper or the printing film are clearly transferred to the surface of the wool fabric; s32, separating the wool fabric printed with patterns from the printing paper or the printing film after the wool fabric is discharged from the transfer printing device;

s4, steaming: introducing the wool fabric printed with the patterns into a continuous steamer, steaming for 60min under 105 ℃ saturated steam, and steaming and coloring;

s5, washing: soaking the wool fabric in cold water after leaving the steamer, then washing with hot water for 10min, soaping for 1min, and washing with warm water for 5 min;

s6, drying: and drying and shaping the washed wool fabric.

Example 6:

the wool fabric of this embodiment selects the wool non-woven fabrics, and the wet-conversion printing and dyeing material selects acid dye for use.

The alkali-free pretreatment slurry consists of the following components: 4% of a high molecular compound: guar gum, 2% cationic compound: chitin, 5% surfactant: TWEEN-60, 5% chelating agent: DTPMP, 15% film former: resin ERF-3, 1% crosslinking initiator: ammonium persulfate and 68% of water.

The process of treating wool fabric with the alkali-free pre-treatment slurry and wet transfer printing was the same as in example 5.

Example 7:

the wool carpet is selected for the wool fabric of this embodiment, and reactive dye is selected for the wet-conversion printing dye.

The alkali-free pretreatment slurry consists of the following components: 6% of a high molecular compound: guar gum, 2% cationic compound: chitin, 3% surfactant: peregal O, 9% chelating agent: PASP, 25% film former: PX-10, 1.5% crosslinking initiator: isocyanate, 53.5% water.

The process of treating wool fabric with the alkali-free pre-treatment slurry and wet transfer printing was the same as in example 5.

Example 8:

the wool fabric of the embodiment is a wool woven fabric, and the wet-conversion printing and dyeing material is an acid dye.

The alkali-free pretreatment slurry consists of the following components: 20% of a high molecular compound: gum arabic powder, 10% cationic compound: cationic polyacrylamide, 0.3% surfactant: LAS, 0.3% chelating agent: PAA, 15% film forming agent: resin ERF-3, 3% crosslinking initiator: ammonium persulfate, 51.4% water.

The process of treating wool fabric with the alkali-free pre-treatment slurry and wet transfer printing was the same as in example 5.

Example 9:

the wool fabric of this embodiment selects for use the wool non-woven fabrics, and the wet commentaries on classics printing and dyeing material selects for use reactive dye.

The alkali-free pretreatment slurry consists of the following components: 8% of a high molecular compound: SN, 10% cationic compound: cationic polyacrylamide, 0.8% surfactant: LAS, 5% chelating agent: DTPMP, 25% film former: PX-10, 8% crosslinking initiator: isonitrile acid ester, 43.2% water.

The process of treating wool fabric with the alkali-free pre-treatment slurry and wet transfer printing was the same as in example 5.

Example 10:

the wool carpet is selected for the wool fabric of the embodiment, and the acid dye is selected for the wet-conversion printing and dyeing material.

The alkali-free pretreatment slurry consists of the following components: 13% of a high molecular compound: gum arabic powder, 10% cationic compound: cationic polyacrylamide, 2% surfactant: peregal O, 9% chelating agent: PASP, 3% film forming agent: 2020. 1% of crosslinking initiator: melamine, 62% water.

The process of treating wool fabric with the alkali-free pre-treatment slurry and wet transfer printing was the same as in example 5.

Example 11:

the wool fabric of the embodiment is a wool woven fabric, and the wet-conversion printing and dyeing material is a reactive dye.

The alkali-free pretreatment slurry consists of the following components: 10% of a high molecular compound: SN, 18% cationic compound: TG-320, 1% surfactant: peregal O, 0.3% chelating agent: PAA, 25% film-forming agent: PX-10, 2% crosslinking initiator: isocyanate, 43.7% water.

The process of treating wool fabric with the alkali-free pre-treatment slurry and wet transfer printing was the same as in example 5.

Example 12:

the wool fabric of the embodiment is a wool knitted fabric, and the wet-conversion printing and dyeing material is an acid dye.

The alkali-free pretreatment slurry consists of the following components: 25% of a high molecular compound: gum arabic powder, 18% cationic compound: TG-320, 7% surfactant: TWEEN-60, 5% chelating agent: DTPMP, 3% film former: 2020. 0.1% of crosslinking initiator: melamine, 41.9% water.

The process of treating wool fabric with the alkali-free pre-treatment slurry and wet transfer printing was the same as in example 5.

Example 13:

the wool fabric of this embodiment selects for use the wool non-woven fabrics, and the wet commentaries on classics printing and dyeing material selects for use reactive dye.

The alkali-free pretreatment slurry consists of the following components: 8% of a high molecular compound: SN, 18% cationic compound: TG-320, 0.8% surfactant: LAS, 9% chelating agent: PASP, 15% film forming agent: resin ERF-3, 1.5% of a crosslinking initiator: ammonium persulfate, 47.7% water.

The process of treating wool fabric with the alkali-free pre-treatment slurry and wet transfer printing was the same as in example 5.

The wool fabrics obtained in examples 5 to 13 were examined and the results obtained were compared with the following table 2:

table 2:

and (4) conclusion:

after the alkali-free pretreatment slurry is used for pretreating wool fabrics, the wool fabrics are subjected to wet transfer printing by using reactive dyes or acid dyes, the four-color yield of the obtained printed fabrics is higher than that of the prior art, the soaping fastness is over 4 grade, the dry-wet rubbing fastness is over 4 grade/3-4 grade, the contour definition is high, and the dye transfer printing rate is high.

Description of the detection method in each embodiment of the present invention:

K/S value: in the test, a Datacolor 650 computer color measuring and matching instrument is adopted to test a color block of the printed fabric under a D65 light source and an observation angle of 10 degrees, a sample is folded, multi-layer and opaque and then placed on a Datacolor TOOLS color measuring system, 3 different positions are selected on the fabric for testing, and the average value is a K/S value.

Soaping fastness and dry/wet rubbing fastness: the soaping resistance and the rubbing color fastness of the wool printed fabric are tested by respectively referring to the GB/T3921 and 2008 textile color fastness test soaping color fastness and the GB/T3920 and 2008 textile color fastness test rubbing color fastness.

Dye transfer rate: the dye transfer ratio (%) is the amount of dye transferred off/amount of dye on the base printing paper (%).

Definition of the outline: visual inspection was carried out.

SN, WF, T-8055, TG-320, TG-570, 2020, resins ERF-3, 2099 and PX-10 used in the examples of the present invention were purchased from Shanghai textile science research institute, Inc. GM-03 and crosslinker E were purchased from Shanghai Tiantan auxiliary Agents Co., Ltd. 1306 purchased from Shanghai Sockey industries, Inc.

Claims (10)

1. An alkali-free pretreatment slurry for wet transfer printing of wool fabrics and a printing process are characterized in that: the alkali-free pretreatment slurry comprises the following components: 0.3-50% of macromolecular compound, 0-20% of cationic compound, 0.1-10% of surfactant, 0-10% of chelating agent, 0-30% of film-forming agent, 0-10% of crosslinking initiator, 0-8% of moisturizing compound and the balance of water, wherein the sum of the contents of all the components is 100%;

the printing process comprises the following steps: s1, preparing slurry; s2, sizing; s3, wet transfer printing; s4, steaming; and S5, washing with water, S6 and drying.

2. The alkali-free pretreatment slurry for wool fabric wet transfer printing and the printing process according to claim 1, wherein the alkali-free pretreatment slurry comprises the following components in percentage by weight: the cationic compound can be one or more of quaternary ammonium salt compound, chitin, cationic organosilicon and cationic polyacrylamide.

3. The alkali-free pretreatment slurry for wool fabric wet transfer printing and the printing process according to claim 1, wherein the alkali-free pretreatment slurry comprises the following components in percentage by weight: the film forming agent is one or more of waterborne polyurethane, EVA emulsion, PVA and fluorocarbon.

4. The alkali-free pretreatment slurry for wool fabric wet transfer printing and the printing process according to claim 1, wherein the alkali-free pretreatment slurry comprises the following components in percentage by weight: the crosslinking initiator is one or more of isocyanate, melamine, ammonium persulfate and peroxide.

5. The alkali-free pretreatment slurry for wool fabric wet transfer printing and the printing process according to claim 1, wherein the alkali-free pretreatment slurry comprises the following components in percentage by weight: the high molecular compound is one or more of natural high molecular compound and synthetic high molecular compound; the natural polymer compound is one or more of sodium alginate, dragon gum, guar gum, gelatin, CMC, gum arabic powder and beta-cyclodextrin; the synthetic high molecular compound is one or more of polyacrylate compound, polymethacrylate compound and polyacrylamide.

6. The alkali-free pretreatment slurry for wool fabric wet transfer printing and the printing process according to claim 1, wherein the alkali-free pretreatment slurry comprises the following components in percentage by weight: the surfactant is one or more of AEO-3, AEO-5, AEO-6, AEO-7, AEO-9, AEO-10, TX-4, TX-5, TX-7, TX-9, TX-10, TX-12, TX-13, TX-15, TX-18, TX-21, TX-30, SPAN-20, SPAN-40, SPAN-60, SPAN-80, SPAN-85, TWEEN-20, TWEEN-40, TWEEN-60, TWEEN-80, isotridecyl alcohol ether, peregal O, LAS, AES, SDBS and JFC.

7. The alkali-free pretreatment slurry for wool fabric wet transfer printing and the printing process according to claim 1, wherein the alkali-free pretreatment slurry comprises the following components in percentage by weight: the chelating agent is one or more of HEDP, EDTA, PBTC, PAA, DTPMP and PASP.

8. The alkali-free pretreatment slurry for wool fabric wet transfer printing and the printing process according to claim 1, wherein the alkali-free pretreatment slurry comprises the following components in percentage by weight: the moisturizing compound is one or more of glycerol, butanol, chitosan, hyaluronic acid, xylitol or urea.

9. The slurry for wool fabric wet transfer printing and the printing process according to any one of claims 1 to 8, wherein the slurry comprises: the alkali-free pretreatment slurry comprises the following components: 5% of sodium alginate, 10% of T-8055, 5% of AEO-5, 3% of EDTA, 8% of waterborne polyurethane, 0.3% of isocyanate and 68.7% of water.

10. The alkali-free pretreatment slurry for wool fabric wet transfer printing and the printing process according to claim 1, wherein the alkali-free pretreatment slurry comprises the following components in percentage by weight: the specific method of step S1 is as follows: s11 paste melting: adding a macromolecular compound into half of water, stirring, and standing until the mixture is uniformly mixed; s12, adding water: adding the residual water content into a material melting barrel, adding the melted paste, and stirring until the mixture is uniformly mixed; s13, adding a cationic compound: adding a cationic compound under stirring; s14, adding a surfactant: adding a surfactant under stirring; s15, adding a chelating agent: adding a chelating agent under stirring; s16, adding a film forming agent and a crosslinking initiator: adding the film forming agent and the crosslinking initiator under the stirring state, and stirring until all the components are uniformly mixed;

the specific method of step S2 is as follows: setting the process as one soaking and one rolling, the pressure is 1-16KG, the liquid carrying rate is 10% -100%, and the wet wool fabric is obtained;

the specific method of step S3 is as follows: s31, attaching the wetted wool fabric and the printing paper or the printing film together, and then rolling the wool fabric and the printing paper or the printing film in a transfer printing device, wherein the running speed is 5-35 m/min, and the transfer printing pressure is 0.5-5 MPa, so that the patterns on the printing paper or the printing film are clearly transferred to the surface of the wool fabric; s32, separating the wool fabric printed with patterns from the printing paper or the printing film after the wool fabric is discharged from the transfer printing device;

the specific method of step S4 is as follows: introducing the wool fabric printed with the pattern into a continuous steamer, steaming for 30-90min at 100-105 ℃ saturated steam, and steaming for color development;

the specific method of step S5 is as follows: soaking the wool fabric in cold water after leaving the steamer, then washing with hot water for 10min, soaping for 1min, and washing with warm water for 5 min;

the specific method of step S6 is as follows: and drying and shaping the washed wool fabric.