Dispersible non-woven fabric pearl jacquard technology

Abstract

The invention discloses a non-woven fabric pearl jacquard technology capable of being dispersed, and belongs to the technical field of non-woven fabrics. The process comprises the following steps: mixing and stirring pretreated softwood pulp and pretreated lyocell fibers to obtain mixed pulp; adding a composite adhesive into the mixed slurry, stirring and mixing to obtain composite slurry; sequentially carrying out inclined wire forming, spunlace treatment and vacuum dehydration on the composite slurry to obtain a fiber web; the fiber web is embossed by a pearl pattern roller to obtain the dispersible pearl jacquard non-woven fabric. The adhesive structure is destroyed through a rapid chemical reaction path which is activated under a large amount of water and mechanical disturbance, the bottleneck that strength and dispersity are mutually restricted in the prior art is solved, and non-woven fabric products can be rapidly dispersed on the premise that the using performance is not sacrificed.

Description

Technical Field

[0001] This invention relates to the field of nonwoven fabric technology, specifically to a washable nonwoven fabric pearl jacquard process. Background Technology

[0002] Nonwoven materials (commonly known as non-woven fabrics) do not require spinning and can be directly made into sheets, webs, or wadding. Due to their rapid production, low cost, and diverse properties, they play a crucial role in industry and daily consumption. Disposable products such as wet wipes and cleaning cloths, in particular, are widely used in personal care, household cleaning, and medical fields due to their convenience and hygiene, significantly improving quality of life and public health. However, the large consumption of these materials makes their post-use disposal a key focus for sustainable industrial development and environmental protection.

[0003] In the early days, to pursue strength, durability, and cost advantages, nonwoven materials mostly used stable synthetic fibers such as polypropylene and polyester. Products made through processes such as thermal bonding, needle punching, or hydroentangling have tightly bonded fibers, forming a stable three-dimensional structure with good tensile strength and abrasion resistance, meeting the strength requirements for use. However, this chemical inertness and structural stability bring serious environmental problems after disposal: it is difficult to degrade, does not disintegrate in water, and can easily entangle and clog pipes when carelessly disposed of in sewers, threatening municipal sewage discharge.

[0004] To address environmental pressures, the industry is turning to biodegradable materials made from natural fibers. However, in practice, pure natural short fiber technology presents an irreconcilable contradiction: the wet strength required for use directly conflicts with the rapid water dispersibility required for disposal. To ensure that the product is not easily damaged during use (such as with wet wipes), it is necessary to enhance the hydroentanglement energy, increase entanglement points, or add wet strength agents. While this improves wet strength and usability, it weakens flushability and still carries the risk of clogging. If flushability is prioritized at the expense of fiber bonding strength, the product may be easy to disperse, but its wet strength will not meet the standards, making it prone to damage during use and losing its functional value.

[0005] Patent CN105420920A discloses a process and equipment for preparing pure seaweed fiber filament nonwoven fabric based on wet spinning technology. This technology prepares nascent seaweed fiber bundles using a conventional wet spinning process, uniformly lays them into a web, and then performs hydroentangling reinforcement and drying. While this method can utilize natural fibers to produce nonwoven fabrics with thin, breathable, and highly absorbent properties, its process has limited control over the uniformity of the fiber web, potentially leading to unstable performance of the finished product when dispersed in water. Furthermore, it fails to effectively address the strength issue of natural fibers in a wet state.

[0006] Therefore, designing a washable nonwoven fabric that has sufficient wet integrity during use and can be quickly triggered to disintegrate upon disposal is an important problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0007] To address the issues of mechanical stability and rapid dispersibility during processing in existing washable nonwoven fabrics, this invention provides a pearl jacquard process for washable nonwoven fabrics. Specifically, the technical solution of this invention includes the following: A washable nonwoven fabric pearl jacquard process, the process comprising the following steps: Pretreated softwood pulp is obtained by sequentially pulping and refining softwood pulp and deionized water. Lyocell fibers are opened to obtain pretreated lyocell fibers; Pretreated softwood pulp and pretreated lyocell fiber are mixed and stirred to obtain a mixed pulp; A composite slurry is obtained by adding a composite adhesive to the mixed slurry and stirring. The composite slurry is formed into a wet fiber web by oblique mesh forming; The wet fiber web is then subjected to hydroentangling and vacuum dehydration to obtain the fiber web. Pearl-textured fiber web is obtained by embossing the fiber web with a pearl-textured roller. The described washable pearl jacquard nonwoven fabric is obtained by drying the pearl-textured fiber web.

[0008] Furthermore, the mixing conditions for pretreated softwood pulp and pretreated lyocell fiber include a mixing speed of 500-800 r / min and a mixing time of 20-30 min.

[0009] Furthermore, the preparation method of the composite adhesive includes the following steps: ε-caprolactone, L-lactic acid and zinc lactate were reacted at 140℃ for 6-8 days to obtain a copolyester; The copolyester was dispersed in ethyl acetate to obtain an oil phase; Lecithin and sucrose esters were dispersed in deionized water to obtain an aqueous phase; The oil phase and aqueous phase were sequentially subjected to high-speed shear emulsification and rotary evaporation to obtain an emulsion; Sodium carboxymethyl cellulose was dispersed in deionized water to obtain a carboxymethyl cellulose solution; The composite adhesive was prepared by mixing a mixed emulsion, a carboxymethyl cellulose solution, and bilayer microcapsules and adjusting the pH to 5.5-6.5.

[0010] Furthermore, the weight ratio of ε-caprolactone, L-lactic acid, and zinc lactate is 25~38:10:0.035~0.045.

[0011] Furthermore, the weight ratio of the copolyester, lecithin, and sucrose ester is 100:2~4:0.4~0.6.

[0012] Furthermore, the conditions for high-speed shear emulsification include an emulsification speed of 8000 r / min and an emulsification time of 5 to 10 min.

[0013] Furthermore, the weight ratio of sodium carboxymethyl cellulose to deionized water is 15~25:100.

[0014] Furthermore, the preparation method of the bilayer microcapsules includes the following steps: Green tea powder and deionized water are mixed and stirred, then baked to obtain dried tea residue; Pretreated tea residue is obtained by mixing dried tea residue and deionized water and then treating it at high temperature. After the pretreated tea residue was mixed and reacted with potassium hydroxide, it was soaked in a 2wt% citric acid solution to obtain acid-base treated tea residue. Activated tea residue is obtained by reacting acid-base treated tea residue with tris(hydroxymethyl)aminomethane. Immobilized lipase was obtained by mixing activated tea residue and lipase and reacting with a vortex reaction. Anhydrous sodium carbonate and immobilized lipase were mixed to obtain a core mixture; The core mixture is fluidized with hot air while being atomized and sprayed with a 5wt% ethyl cellulose ethanol solution to obtain an intermediate. The intermediate was dispersed in a 0.5 wt% chitosan solution and stirred, then dispersed in a 1 wt% sodium alginate solution, and 5 wt% calcium chloride solution was added dropwise with stirring to obtain the bilayer microcapsules.

[0015] Furthermore, the conditions for the high-temperature treatment include a treatment temperature of 200°C and a treatment time of 5 hours.

[0016] Furthermore, the weight ratio of the pretreated tea residue to potassium hydroxide is 1:0.2~0.3.

[0017] Furthermore, the conditions for the reaction of the pretreated tea residue and potassium hydroxide include a reaction temperature of 23-25°C and a reaction time of 24 hours.

[0018] Furthermore, the weight ratio of the acid-base treated tea residue to tris(hydroxymethyl)aminomethane is 0.8~1.2:0.06~0.08.

[0019] Furthermore, the conditions for the acid-base treatment of tea residue and the reaction of tris(hydroxymethyl)aminomethane include a reaction temperature of 50-70°C and a reaction time of 4-5 hours.

[0020] Furthermore, the weight ratio of the activated tea residue to lipase is 4~8:0.25~0.45.

[0021] Furthermore, the conditions for the mixed oscillation reaction of activated tea residue and lipase include a reaction temperature of 30-35℃ and a reaction time of 0.25-0.45 seconds.

[0022] Furthermore, the weight ratio of the anhydrous sodium carbonate to the immobilized lipase is 3~4:10~15.

[0023] Furthermore, the weight ratio of the emulsion, carboxymethyl cellulose solution, and bilayer microcapsules is 50~70:15~25:15~20.

[0024] Furthermore, the weight ratio of the softwood pulp, lyocell fiber, and composite adhesive is 30~50:50~70:4~6.

[0025] Furthermore, the conditions for the hydroentangling process include pre-wetting treatment at a pressure of 20-40 bar and a water needle diameter of 0.12 mm; followed by a first main hydroentangling treatment at a pressure of 70-90 bar and a water needle density of 40 pores / cm; then a second main hydroentangling treatment at a pressure of 90-110 bar and a water needle density of 50 pores / cm; and finally a third hydroentangling treatment at a pressure of 110-130 bar and a water needle density of 60 pores / cm.

[0026] Furthermore, the embossing conditions include a processing temperature of 120°C, a linear pressure of 8 MPa, and an embossing time of 3 seconds.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) The preparation of the double-layer microcapsule in this invention ensures the stability of the lipase in the environment, so that the lipase can still maintain a fairly high catalytic activity when it is subsequently released into the alkaline environment; Ethyl cellulose as the inner layer material forms a strong chemical barrier, which can effectively prevent trace amounts of moisture in the environment from penetrating into the core during product storage and use, thereby avoiding premature hydration of the alkaline substances in the core with the enzyme or unexpected slow reaction with the acidic or ester components in the adhesive system, ensuring the "dormant" state of the entire system; A composite polyelectrolyte membrane with specific environmental responsiveness is constructed on the outer layer, and its material is chitosan-calcium alginate. This chitosan-calcium alginate outer shell exhibits considerable mechanical strength and brittleness in low-moisture environments (such as in the soaking solution of wet wipes) or in a dry state, protecting the inner structure. However, once it is placed in an environment with a large amount of water (such as a toilet), the calcium alginate network will rapidly swell due to ion exchange with sodium ions in the water, resulting in high stress concentration in the network structure and a sharp decrease in its mechanical strength. At this time, the weak shear force or turbulent impact force provided by the water flow is enough to cause it to fracture brittlely, thereby initiating the entire dispersion process.

[0028] (2) In this invention, the copolyester forms an interconnected, porous three-dimensional network structure skeleton in the fiber web; after drying, sodium carboxymethyl cellulose forms a polymer film between the copolyester skeleton and the wood pulp fiber, anchoring the wood pulp fiber to the copolyester skeleton and forming a stable composite interface; when the product is used, the limited impregnation liquid usually has insufficient water content to completely dissolve it, which will cause the sodium carboxymethyl cellulose polymer chain to swell and enter a gel state, but still maintain a significant adhesive function, thereby ensuring the wet strength of the product.

[0029] (3) The present invention destroys the adhesive structure through a rapid chemical reaction pathway activated by a large amount of water and mechanical disturbance, which solves the bottleneck of mutual constraint between strength and dispersibility in the prior art, enabling non-woven products to achieve rapid dispersion without sacrificing performance. Detailed Implementation

[0030] The technical solution of the present invention will be clearly and completely described below through embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Unless otherwise stated, all raw materials and reagents used in this invention are commercially available or can be prepared by known methods.

[0032] Preparation Example 1: The preparation method of bilayer microcapsules includes the following steps: Green tea powder and deionized water were mixed at a weight ratio of 1:20 and stirred at 90℃ for 3 hours. The wet green tea residue was then collected and baked at 60℃ for 24 hours to obtain dried tea residue. Four parts by weight of the dried tea residue were dispersed in 40 parts by weight of deionized water and placed in a hydrothermal reactor at 200℃ for 5 hours. Afterward, it was vacuum dried at 60℃ for 8 hours to obtain pretreated tea residue. One part by weight of the pretreated tea residue and 0.2 parts by weight of potassium hydroxide were dispersed in 50 parts by weight of ethanol solution. The tea residue was soaked at 23℃ for 24 hours, washed with deionized water until pH 7.4, and then soaked in 2wt% citric acid solution for another 24 hours. It was then washed with deionized water until neutral and finally vacuum dried at 60℃ for 8 hours to obtain acid-base treated tea residue. 0.8 parts by weight of acid-base treated tea residue and 0.06 parts by weight of tris(hydroxymethyl)aminomethane were dispersed in 100 parts by weight of deionized water and stirred at 50℃ for 4 hours. After washing with deionized water and vacuum drying, activated tea residue was obtained. Four parts by weight of activated tea residue and 0.25 parts by weight of lipase were dispersed in 100 parts by weight of phosphate buffer at pH 7.5 and shaken at 30°C for 6 hours. After washing and drying, immobilized lipase was obtained. Three parts by weight of anhydrous sodium carbonate and 10 parts by weight of immobilized lipase were mixed under nitrogen protection for 40 minutes to obtain a core mixture. Ten parts by weight of the core mixture were placed in a fluidized bed bottom spray coating machine and fluidized with hot air at 60°C. At the same time, 5 wt% ethyl cellulose ethanol solution was sprayed in by atomization. The total spray volume was controlled so that the dry weight of the coating layer was 10% of the core weight to obtain an intermediate. The above intermediate was dispersed in 100 parts by weight of a 0.5 wt% chitosan solution with pH 4.5, stirred and adsorbed for 30 min, then centrifuged and washed to obtain chitosan-coated particles; the above chitosan-coated particles were dispersed in 50 parts by weight of a 1 wt% sodium alginate solution, and 5 wt% calcium chloride solution was added dropwise at 1500 r / min, stirred and reacted for 10 min, then filtered and washed, and dried under vacuum at 40 °C to obtain bilayer microcapsules.

[0033] Preparation Example 2: The preparation method of bilayer microcapsules includes the following steps: Green tea powder and deionized water were mixed at a weight ratio of 1:20 and stirred at 90℃ for 3 hours. The wet green tea residue was then collected and baked at 60℃ for 24 hours to obtain dried tea residue. Four parts by weight of the dried tea residue were dispersed in 40 parts by weight of deionized water and placed in a hydrothermal reactor at 200℃ for 5 hours. Afterward, it was vacuum dried at 60℃ for 8 hours to obtain pretreated tea residue. One part by weight of the pretreated tea residue and 0.22 parts by weight of potassium hydroxide were dispersed in 50 parts by weight of ethanol solution and stirred at 2... The tea residue was soaked at 4℃ for 24 hours, washed with deionized water until pH 7.4, and then soaked in 2wt% citric acid solution for another 24 hours. It was then washed with deionized water until neutral and finally vacuum dried at 60℃ for 8 hours to obtain acid-base treated tea residue. 0.9 parts by weight of acid-base treated tea residue and 0.065 parts by weight of tris(hydroxymethyl)aminomethane were dispersed in 100 parts by weight of deionized water and stirred at 55℃ for 4.2 hours. After washing with deionized water and vacuum drying, activated tea residue was obtained. Five parts by weight of activated tea residue and 0.30 parts by weight of lipase were dispersed in 100 parts by weight of phosphate buffer at pH 7.5 and shaken at 31°C for 6.5 h. After washing and drying, immobilized lipase was obtained. 3.2 parts by weight of anhydrous sodium carbonate and 11 parts by weight of immobilized lipase were mixed under nitrogen protection for 45 min to obtain a core mixture. Ten parts by weight of the core mixture were placed in a fluidized bed bottom spray coating machine and fluidized with hot air at 62°C. At the same time, 5 wt% ethyl cellulose ethanol solution was sprayed in by atomization. The total spray volume was controlled so that the dry weight of the coating layer was 10% of the core weight to obtain an intermediate. The above intermediate was dispersed in 100 parts by weight of a 0.5 wt% chitosan solution with pH 4.5, stirred and adsorbed for 35 min, then centrifuged and washed to obtain chitosan-coated particles; the above chitosan-coated particles were dispersed in 50 parts by weight of a 1 wt% sodium alginate solution, and 5 wt% calcium chloride solution was added dropwise at 1500 r / min, stirred and reacted for 15 min, then filtered and washed, and dried under vacuum at 40 °C to obtain bilayer microcapsules.

[0034] Preparation Example 3: The preparation method of bilayer microcapsules includes the following steps: Green tea powder and deionized water were mixed at a weight ratio of 1:20 and stirred at 90℃ for 3 hours. The wet green tea residue was then collected and baked at 60℃ for 24 hours to obtain dried tea residue. Four parts by weight of the dried tea residue were dispersed in 40 parts by weight of deionized water and placed in a hydrothermal reactor at 200℃ for 5 hours. Afterward, it was vacuum dried at 60℃ for 8 hours to obtain pretreated tea residue. One part by weight of the pretreated tea residue and 0.25 parts by weight of potassium hydroxide were dispersed in 50 parts by weight of ethanol solution. The tea residue was soaked at 25℃ for 24 hours, washed with deionized water until pH 7.4, and then soaked in 2wt% citric acid solution for another 24 hours. It was then washed with deionized water until neutral and finally vacuum dried at 60℃ for 8 hours to obtain acid-base treated tea residue. 1.0 part by weight of acid-base treated tea residue and 0.07 parts by weight of tris(hydroxymethyl)aminomethane were dispersed in 100 parts by weight of deionized water and stirred at 60℃ for 4.5 hours. After washing with deionized water and vacuum drying, activated tea residue was obtained. Six parts by weight of activated tea residue and 0.35 parts by weight of lipase were dispersed in 100 parts by weight of phosphate buffer at pH 7.5 and shaken at 32°C for 7 hours. After washing and drying, immobilized lipase was obtained. 3.5 parts by weight of anhydrous sodium carbonate and 12 parts by weight of immobilized lipase were mixed under nitrogen protection for 50 minutes to obtain a core mixture. Ten parts by weight of the core mixture were placed in a fluidized bed bottom spray coating machine and fluidized with hot air at 65°C. At the same time, 5 wt% ethyl cellulose ethanol solution was sprayed in by atomization. The total spray volume was controlled so that the dry weight of the coating layer was 10% of the core weight to obtain an intermediate. The above intermediate was dispersed in 100 parts by weight of a 0.5 wt% chitosan solution with pH 4.5, stirred and adsorbed for 40 min, then centrifuged and washed to obtain chitosan-coated particles; the above chitosan-coated particles were dispersed in 50 parts by weight of a 1 wt% sodium alginate solution, and 5 wt% calcium chloride solution was added dropwise at 1500 r / min, stirred and reacted for 20 min, then filtered and washed sequentially, and vacuum dried at 40 °C to obtain bilayer microcapsules.

[0035] Preparation Example 4: The preparation method of bilayer microcapsules includes the following steps: Green tea powder and deionized water were mixed at a weight ratio of 1:20 and stirred at 90℃ for 3 hours. The wet green tea residue was then collected and baked at 60℃ for 24 hours to obtain dried tea residue. Four parts by weight of the dried tea residue were dispersed in 40 parts by weight of deionized water and placed in a hydrothermal reactor at 200℃ for 5 hours. Afterward, it was vacuum dried at 60℃ for 8 hours to obtain pretreated tea residue. One part by weight of the pretreated tea residue and 0.27 parts by weight of potassium hydroxide were dispersed in 50 parts by weight of ethanol solution and stirred at 2... The tea residue was soaked at 5℃ for 24 hours, washed with deionized water until pH 7.4, and then soaked in 2wt% citric acid solution for another 24 hours. It was then washed with deionized water until neutral and finally vacuum dried at 60℃ for 8 hours to obtain acid-base treated tea residue. 1.1 parts by weight of acid-base treated tea residue and 0.075 parts by weight of tris(hydroxymethyl)aminomethane were dispersed in 100 parts by weight of deionized water and stirred at 65℃ for 4.7 hours. After washing with deionized water and vacuum drying, activated tea residue was obtained. Seven parts by weight of activated tea residue and 0.40 parts by weight of lipase were dispersed in 100 parts by weight of phosphate buffer at pH 7.5 and shaken at 33°C for 7.5 h. After washing and drying, immobilized lipase was obtained. 3.7 parts by weight of anhydrous sodium carbonate and 13 parts by weight of immobilized lipase were mixed under nitrogen protection for 55 min to obtain a core mixture. Ten parts by weight of the core mixture were placed in a fluidized bed bottom spray coating machine and fluidized with hot air at 67°C. At the same time, 5 wt% ethyl cellulose ethanol solution was sprayed in by atomization. The total spray volume was controlled so that the dry weight of the coating layer was 10% of the core weight to obtain an intermediate. The above intermediate was dispersed in 100 parts by weight of a 0.5 wt% chitosan solution with pH 4.5, stirred and adsorbed for 50 min, then centrifuged and washed to obtain chitosan-coated particles; the above chitosan-coated particles were dispersed in 50 parts by weight of a 1 wt% sodium alginate solution, and 5 wt% calcium chloride solution was added dropwise at 1500 r / min, stirred and reacted for 25 min, then filtered and washed, and dried under vacuum at 40 °C to obtain bilayer microcapsules.

[0036] Preparation Example 5: The preparation method of bilayer microcapsules includes the following steps: Green tea powder and deionized water were mixed at a weight ratio of 1:20 and stirred at 90℃ for 3 hours. The wet green tea residue was then collected and baked at 60℃ for 24 hours to obtain dried tea residue. Four parts by weight of the dried tea residue were dispersed in 40 parts by weight of deionized water and placed in a hydrothermal reactor at 200℃ for 5 hours. Afterward, it was vacuum dried at 60℃ for 8 hours to obtain pretreated tea residue. One part by weight of the pretreated tea residue and 0.3 parts by weight of potassium hydroxide were dispersed in 50 parts by weight of ethanol solution. The tea residue was soaked at 25℃ for 24 hours, washed with deionized water until pH 7.4, and then soaked in 2wt% citric acid solution for another 24 hours. It was then washed with deionized water until neutral and finally vacuum dried at 60℃ for 8 hours to obtain acid-base treated tea residue. 1.2 parts by weight of acid-base treated tea residue and 0.08 parts by weight of tris(hydroxymethyl)aminomethane were dispersed in 100 parts by weight of deionized water and stirred at 70℃ for 5 hours. After washing with deionized water and vacuum drying, activated tea residue was obtained. Eight parts by weight of activated tea residue and 0.45 parts by weight of lipase were dispersed in 100 parts by weight of phosphate buffer at pH 7.5 and shaken at 35°C for 8 hours. After washing and drying, immobilized lipase was obtained. Four parts by weight of anhydrous sodium carbonate and 15 parts by weight of immobilized lipase were mixed under nitrogen protection for 60 minutes to obtain a core mixture. Ten parts by weight of the core mixture were placed in a fluidized bed bottom spray coating machine and fluidized with hot air at 70°C. At the same time, 5 wt% ethyl cellulose ethanol solution was sprayed in by atomization. The total spray volume was controlled so that the dry weight of the coating layer was 10% of the core weight to obtain an intermediate. The above intermediate was dispersed in 100 parts by weight of a 0.5 wt% chitosan solution with pH 4.5, stirred and adsorbed for 60 min, then centrifuged and washed to obtain chitosan-coated particles; the above chitosan-coated particles were dispersed in 50 parts by weight of a 1 wt% sodium alginate solution, and 5 wt% calcium chloride solution was added dropwise at 1500 r / min, stirred and reacted for 30 min, then filtered and washed, and dried under vacuum at 40 °C to obtain bilayer microcapsules.

[0037] Preparation Example 6: The preparation method of bilayer microcapsules includes the following steps: The immobilized lipase in Preparation Example 5 was replaced with lipase, and all other operations were the same as in Preparation Example 5.

[0038] Preparation Example 7: The preparation method of bilayer microcapsules includes the following steps: Remove the 5 wt% ethyl cellulose ethanol solution from Preparation Example 5, and keep all other operations consistent with Preparation Example 5.

[0039] Preparation Example 8: The preparation method of bilayer microcapsules includes the following steps: Remove the 0.5 wt% chitosan solution, 1 wt% sodium alginate solution and 5 wt% calcium chloride solution from Preparation Example 5, and keep all other operations the same as in Preparation Example 5.

[0040] Preparation Example 9: The preparation method of the composite adhesive includes the following steps: 25 parts by weight of ε-caprolactone, 10 parts by weight of L-lactic acid and 0.035 parts by weight of zinc lactate were reacted at 140°C for 6 days under nitrogen protection. After the reaction, the copolyester was obtained by dissolution, precipitation and vacuum drying. 100 parts by weight of the copolyester was dispersed in 400 parts by weight of ethyl acetate to obtain the oil phase. Two parts by weight of lecithin and 0.4 parts by weight of sucrose ester were dispersed in 100 parts by weight of deionized water at 60°C and stirred for 10 minutes to obtain an aqueous phase. The oil phase was slowly added to the aqueous phase, and the mixture was emulsified by high-speed shearing at 8000 r / min for 5 min. The mixture was then circulated 4 times under a pressure of 80 MPa to obtain the final mixture. After removing the organic solvent by rotary evaporation, deionized water is added to adjust the solid content to 50% to obtain an emulsion. 15 parts by weight of sodium carboxymethyl cellulose were dispersed in 100 parts by weight of deionized water at 60°C. The mixture was stirred at 800 r / min for 1 h and then allowed to stand to remove bubbles to obtain a carboxymethyl cellulose solution. Mix 50 parts by weight of emulsion and 15 parts by weight of carboxymethyl cellulose solution, stir at 800 r / min for 30 min, then slowly add 15 parts by weight of the bilayer microcapsules prepared in Preparation Example 1, stir at 200 r / min for 10 min, and adjust the pH to 5.5 to obtain the composite adhesive.

[0041] Preparation Example 10: The preparation method of the composite adhesive includes the following steps: 27 parts by weight of ε-caprolactone, 10 parts by weight of L-lactic acid and 0.037 parts by weight of zinc lactate were reacted at 140°C for 6.5 days under nitrogen protection. After the reaction was completed, the copolyester was obtained by dissolution, precipitation and vacuum drying. 100 parts by weight of the copolyester was dispersed in 400 parts by weight of ethyl acetate to obtain the oil phase. 2.5 parts by weight of lecithin and 0.45 parts by weight of sucrose ester were dispersed in 100 parts by weight of deionized water at 60°C and stirred for 10 min to obtain an aqueous phase; The oil phase was slowly added to the aqueous phase, and the mixture was emulsified by high-speed shearing at 8000 r / min for 6 min. The mixture was then circulated 4 times under a pressure of 90 MPa to obtain the final mixture. After removing the organic solvent by rotary evaporation, deionized water is added to adjust the solid content to 50% to obtain an emulsion. 17 parts by weight of sodium carboxymethyl cellulose were dispersed in 100 parts by weight of deionized water at 60°C. The mixture was stirred at 800 r / min for 1.2 h and then allowed to stand to remove bubbles to obtain a carboxymethyl cellulose solution. Mix 55 parts by weight of emulsion and 17 parts by weight of carboxymethyl cellulose solution, stir at 800 r / min for 30 min, then slowly add 16 parts by weight of the bilayer microcapsules prepared in Preparation Example 2, stir at 200 r / min for 10 min, and adjust the pH to 5.7 to obtain the composite adhesive.

[0042] Preparation Example 11: The preparation method of the composite adhesive includes the following steps: 30 parts by weight of ε-caprolactone, 10 parts by weight of L-lactic acid and 0.040 parts by weight of zinc lactate were reacted at 140°C for 7 days under nitrogen protection. After the reaction, the copolyester was obtained by dissolution, precipitation and vacuum drying. 100 parts by weight of the copolyester was dispersed in 400 parts by weight of ethyl acetate to obtain the oil phase. Three parts by weight of lecithin and 0.5 parts by weight of sucrose ester were dispersed in 100 parts by weight of deionized water at 60°C and stirred for 10 minutes to obtain an aqueous phase. The oil phase was slowly added to the aqueous phase, and after high-speed shear emulsification at 8000 r / min for 7 min, the mixture was circulated 4 times under a pressure of 100 MPa to obtain the mixture. After removing the organic solvent by rotary evaporation, deionized water is added to adjust the solid content to 50% to obtain an emulsion. 20 parts by weight of sodium carboxymethyl cellulose were dispersed in 100 parts by weight of deionized water at 60°C. The mixture was stirred at 800 r / min for 1.5 h and then allowed to stand to remove bubbles to obtain a carboxymethyl cellulose solution. Mix 60 parts by weight of emulsion and 20 parts by weight of carboxymethyl cellulose solution, stir at 800 r / min for 30 min, then slowly add 17 parts by weight of the bilayer microcapsules prepared in Preparation Example 3, stir at 200 r / min for 10 min, and adjust the pH to 6.0 to obtain the composite adhesive.

[0043] Preparation Example 12: The preparation method of the composite adhesive includes the following steps: 34 parts by weight of ε-caprolactone, 10 parts by weight of L-lactic acid and 0.042 parts by weight of zinc lactate were reacted at 140°C for 7.5 days under nitrogen protection. After the reaction was completed, the copolyester was obtained by dissolution, precipitation and vacuum drying. 100 parts by weight of the copolyester was dispersed in 400 parts by weight of ethyl acetate to obtain the oil phase. 3.5 parts by weight of lecithin and 0.55 parts by weight of sucrose ester were dispersed in 100 parts by weight of deionized water at 60°C and stirred for 10 min to obtain an aqueous phase; The oil phase was slowly added to the aqueous phase, and after high-speed shear emulsification at 8000 r / min for 8 min, the mixture was circulated 4 times under a pressure of 110 MPa to obtain the mixture. After removing the organic solvent by rotary evaporation, deionized water is added to adjust the solid content to 50% to obtain an emulsion. 22 parts by weight of sodium carboxymethyl cellulose were dispersed in 100 parts by weight of deionized water at 60°C. The mixture was stirred at 800 r / min for 1.7 h and then allowed to stand to remove bubbles to obtain a carboxymethyl cellulose solution. Mix 65 parts by weight of emulsion and 22 parts by weight of carboxymethyl cellulose solution, stir at 800 r / min for 30 min, then slowly add 18 parts by weight of the bilayer microcapsules prepared in Preparation Example 4, stir at 200 r / min for 10 min, and adjust the pH to 6.2 to obtain the composite adhesive.

[0044] Preparation Example 13: The preparation method of the composite adhesive includes the following steps: 38 parts by weight of ε-caprolactone, 10 parts by weight of L-lactic acid and 0.045 parts by weight of zinc lactate were reacted at 140°C for 8 days under nitrogen protection. After the reaction, the copolyester was obtained by dissolution, precipitation and vacuum drying. 100 parts by weight of the copolyester was dispersed in 400 parts by weight of ethyl acetate to obtain the oil phase. Four parts by weight of lecithin and 0.6 parts by weight of sucrose ester were dispersed in 100 parts by weight of deionized water at 60°C and stirred for 10 minutes to obtain an aqueous phase. The oil phase was slowly added to the aqueous phase, and after high-speed shear emulsification at 8000 r / min for 10 min, the mixture was circulated 4 times under a pressure of 120 MPa to obtain the mixture. After removing the organic solvent by rotary evaporation, deionized water is added to adjust the solid content to 50% to obtain an emulsion. 25 parts by weight of sodium carboxymethyl cellulose were dispersed in 100 parts by weight of deionized water at 60°C. The mixture was stirred at 800 r / min for 2 h and then allowed to stand to remove bubbles to obtain a carboxymethyl cellulose solution. 70 parts by weight of emulsion and 25 parts by weight of carboxymethyl cellulose solution were mixed and stirred at 800 r / min for 30 min. Then, 20 parts by weight of the bilayer microcapsules prepared in Preparation Example 5 were slowly added and stirred at 200 r / min for 10 min. The pH was then adjusted to 6.5 to obtain the composite adhesive.

[0045] Preparation Example 14: The preparation method of the composite adhesive includes the following steps: Replace the bilayer microcapsules prepared in Preparation Example 5 of Preparation Example 13 with the bilayer microcapsules prepared in Preparation Example 6, and keep all other operations the same as in Preparation Example 13.

[0046] Preparation Example 15: The preparation method of the composite adhesive includes the following steps: The bilayer microcapsules prepared in Preparation Example 5 of Preparation Example 13 were replaced with the bilayer microcapsules prepared in Preparation Example 8, and all other operations were the same as in Preparation Example 13.

[0047] Preparation Example 16: The preparation method of the composite adhesive includes the following steps: Replace the bilayer microcapsules prepared in Preparation Example 5 of Preparation Example 13 with the bilayer microcapsules prepared in Preparation Example 9, and keep all other operations the same as in Preparation Example 13.

[0048] Preparation Example 17: The preparation method of the composite adhesive includes the following steps: Remove the bilayer microcapsules obtained in Preparation Example 5 of Preparation Example 13, and keep the other operations the same as in Preparation Example 13.

[0049] Example 1: A washable nonwoven fabric pearl jacquard process includes the following steps: Add 30 parts by weight of softwood pulp and 1000 parts by weight of deionized water to a pulper, loosen for 15 minutes, then transfer to a refiner and beat with a light knife to a freeness of 25°SR to obtain pretreated softwood pulp. 50 parts by weight of lyocell fiber were opened by an opening machine at a speed of 800 r / min to remove impurities and obtain pretreated lyocell fiber. Mix pretreated softwood pulp and pretreated lyocell fiber, add deionized water to adjust the total concentration to 1%, and then stir at 500 r / min for 20 min to obtain mixed pulp; Four parts by weight of the composite adhesive prepared in Preparation Example 9 were added to the above mixed slurry. After adjusting the pH to 6.0, the mixture was stirred and mixed at 250 r / min at 42°C for 15 min to obtain a composite slurry. The composite slurry was processed by an inclined wire forming machine to obtain a wet fiber web at a wire speed of 10 m / min. The wet fiber web is first pre-wetted under a pressure of 20 bar and a water needle aperture of 0.12 mm; then, it undergoes the first main hydroentangling treatment under a pressure of 70 bar and a water needle density of 40 pores / cm to achieve front-side entanglement; subsequently, it undergoes the second main hydroentangling treatment under a pressure of 90 bar and a water needle density of 50 pores / cm to achieve back-side entanglement; next, it undergoes the third hydroentangling treatment under a pressure of 110 bar and a water needle density of 60 pores / cm to reinforce the structure; finally, it is vacuum dehydrated under a vacuum of 0.08 MPa to obtain the fiber web. The fiber web is embossed by a pearl-patterned roller in a 120℃ environment with a linear pressure of 8MPa and a speed of 8m / min for 3s to obtain a pearl-patterned fiber web. Pearl-textured fiber web is processed by a 110℃ hot air penetration dryer and dried to a moisture content of 7% at an air speed of 2.5m / s before being rolled up to obtain a washable pearl jacquard nonwoven fabric.

[0050] Example 2: A washable nonwoven fabric pearl jacquard process includes the following steps: Add 35 parts by weight of softwood pulp and 1000 parts by weight of deionized water to a pulper, loosen for 16 minutes, then transfer to a refiner and beat with a light knife to a freeness of 26°SR to obtain pretreated softwood pulp. 55 parts by weight of lyocell fiber were opened by an opening machine at a speed of 800 r / min to remove impurities and obtain pretreated lyocell fiber. Mix pretreated softwood pulp and pretreated lyocell fiber, add deionized water to adjust the total concentration to 1.1%, and then stir at 550 r / min for 22 min to obtain mixed pulp; 4.5 parts by weight of the composite adhesive prepared in Preparation Example 10 were added to the above mixed slurry, the pH was adjusted to 6.0, and the mixture was stirred at 250 r / min for 17 min at 43°C to obtain a composite slurry; the composite slurry was processed by an inclined wire forming machine to obtain a wet fiber web at a wire speed of 12 m / min. The wet fiber web is first pre-wetted under a pressure of 25 bar and a water needle aperture of 0.12 mm; then, it undergoes the first main hydroentangling treatment under a pressure of 75 bar and a water needle density of 40 pores / cm to achieve front-side entanglement; subsequently, it undergoes the second main hydroentangling treatment under a pressure of 95 bar and a water needle density of 50 pores / cm to achieve back-side entanglement; next, it undergoes the third hydroentangling treatment under a pressure of 115 bar and a water needle density of 60 pores / cm to reinforce the structure; finally, it is vacuum dehydrated under a vacuum of 0.08 MPa to obtain the fiber web. The fiber web is embossed by a pearl-patterned roller in a 120℃ environment with a linear pressure of 8MPa and a speed of 8m / min for 3s to obtain a pearl-patterned fiber web. Pearl-textured fiber web is processed by a 110℃ hot air penetration dryer and dried to a moisture content of 7% at an air speed of 2.5m / s before being rolled up to obtain a washable pearl jacquard nonwoven fabric.

[0051] Example 3: A washable nonwoven fabric pearl jacquard process includes the following steps: Add 40 parts by weight of softwood pulp and 1000 parts by weight of deionized water to a pulper, loosen for 17 minutes, then transfer to a refiner and beat with a light knife to a freeness of 27°SR to obtain pretreated softwood pulp. 60 parts by weight of lyocell fiber were opened by an opening machine at a speed of 800 r / min to remove impurities and obtain pretreated lyocell fiber. Mix pretreated softwood pulp and pretreated lyocell fiber, add deionized water to adjust the total concentration to 1.2%, and then stir at 600 r / min for 25 min to obtain mixed pulp; Five parts by weight of the composite adhesive prepared in Preparation Example 11 were added to the above mixed slurry. After adjusting the pH to 6.0, the mixture was stirred and mixed at 250 r / min at 44°C for 20 min to obtain a composite slurry. The composite slurry was then processed by an inclined wire forming machine to obtain a wet fiber web at a wire speed of 15 m / min. The wet fiber web is first pre-wetted under a pressure of 30 bar and a water needle aperture of 0.12 mm; then, it undergoes the first main hydroentangling treatment under a pressure of 80 bar and a water needle density of 40 pores / cm to achieve front-side entanglement; subsequently, it undergoes the second main hydroentangling treatment under a pressure of 100 bar and a water needle density of 50 pores / cm to achieve back-side entanglement; next, it undergoes the third hydroentangling treatment under a pressure of 120 bar and a water needle density of 60 pores / cm to reinforce the structure; finally, it is vacuum dehydrated under a vacuum of 0.08 MPa to obtain the fiber web. The fiber web is embossed by a pearl-patterned roller in a 120℃ environment with a linear pressure of 8MPa and a speed of 8m / min for 3s to obtain a pearl-patterned fiber web. Pearl-textured fiber web is processed by a 110℃ hot air penetration dryer and dried to a moisture content of 7% at an air speed of 2.5m / s before being rolled up to obtain a washable pearl jacquard nonwoven fabric.

[0052] Example 4: A washable nonwoven fabric pearl jacquard process includes the following steps: Add 45 parts by weight of softwood pulp and 1000 parts by weight of deionized water to a pulper, loosen for 18 minutes, then transfer to a refiner and beat with a light knife to a freeness of 28°SR to obtain pretreated softwood pulp. 65 parts by weight of lyocell fiber were opened by an opening machine at a speed of 800 r / min to remove impurities and obtain pretreated lyocell fiber. Mix pretreated softwood pulp and pretreated lyocell fiber, add deionized water to adjust the total concentration to 1.4%, and then stir at 700 r / min for 27 min to obtain mixed pulp; 5.5 parts by weight of the composite adhesive prepared in Preparation Example 12 were added to the above mixed slurry, the pH was adjusted to 6.0, and the mixture was stirred at 250 r / min at 45°C for 23 min to obtain a composite slurry; the composite slurry was processed by an inclined wire forming machine to obtain a wet fiber web at a wire speed of 17 m / min. The wet fiber web is first pre-wetted under a pressure of 35 bar and a water needle aperture of 0.12 mm; then, it undergoes the first main hydroentangling treatment under a pressure of 85 bar and a water needle density of 40 pores / cm to achieve front-side entanglement; subsequently, it undergoes the second main hydroentangling treatment under a pressure of 105 bar and a water needle density of 50 pores / cm to achieve back-side entanglement; next, it undergoes the third hydroentangling treatment under a pressure of 125 bar and a water needle density of 60 pores / cm to reinforce the structure; finally, it is vacuum dehydrated under a vacuum of 0.08 MPa to obtain the fiber web. The fiber web is embossed by a pearl-patterned roller in a 120℃ environment with a linear pressure of 8MPa and a speed of 8m / min for 3s to obtain a pearl-patterned fiber web. Pearl-textured fiber web is processed by a 110℃ hot air penetration dryer and dried to a moisture content of 7% at an air speed of 2.5m / s before being rolled up to obtain a washable pearl jacquard nonwoven fabric.

[0053] Example 5: A washable nonwoven fabric pearl jacquard process includes the following steps: Add 50 parts by weight of softwood pulp and 1000 parts by weight of deionized water to a pulper, loosen for 20 minutes, then transfer to a refiner and beat with a light knife to a freeness of 30°SR to obtain pretreated softwood pulp. 70 parts by weight of lyocell fiber were opened by an opening machine at a speed of 800 r / min to remove impurities and obtain pretreated lyocell fiber. Mix pretreated softwood pulp and pretreated lyocell fiber, add deionized water to adjust the total concentration to 1.5%, and then stir at 800 r / min for 30 min to obtain mixed pulp; Six parts by weight of the composite adhesive prepared in Preparation Example 13 were added to the above mixed slurry. After adjusting the pH to 6.0, the mixture was stirred and mixed at 250 r / min at 47°C for 25 min to obtain a composite slurry. The composite slurry was processed by an inclined wire forming machine to obtain a wet fiber web at a wire speed of 20 m / min. The wet fiber web is first pre-wetted under a pressure of 40 bar and a water needle aperture of 0.12 mm; then, it undergoes the first main hydroentangling treatment under a pressure of 90 bar and a water needle density of 40 pores / cm to achieve front-side entanglement; subsequently, it undergoes the second main hydroentangling treatment under a pressure of 110 bar and a water needle density of 50 pores / cm to achieve back-side entanglement; next, it undergoes the third hydroentangling treatment under a pressure of 130 bar and a water needle density of 60 pores / cm to reinforce the structure; finally, it is vacuum dehydrated under a vacuum of 0.08 MPa to obtain the fiber web. The fiber web is embossed by a pearl-patterned roller in a 120℃ environment with a linear pressure of 8MPa and a speed of 8m / min for 3s to obtain a pearl-patterned fiber web. Pearl-textured fiber web is processed by a 110℃ hot air penetration dryer and dried to a moisture content of 7% at an air speed of 2.5m / s before being rolled up to obtain a washable pearl jacquard nonwoven fabric.

[0054] Comparative Example 1: A washable nonwoven fabric pearl jacquard process includes the following steps: The composite adhesive prepared in Example 13 of Example 5 was replaced with the composite adhesive prepared in Example 14, and all other operations were the same as in Example 5.

[0055] Comparative Example 2: A washable nonwoven fabric pearl jacquard process includes the following steps: The composite adhesive prepared in Example 13 of Example 5 was replaced with the composite adhesive prepared in Example 15, and all other operations were the same as in Example 5.

[0056] Comparative Example 3: A washable nonwoven fabric pearl jacquard process includes the following steps: The composite adhesive prepared in Example 13 of Example 5 was replaced with the composite adhesive prepared in Example 16, and all other operations were the same as in Example 5.

[0057] Comparative Example 4: A washable nonwoven fabric pearl jacquard process includes the following steps: The composite adhesive prepared in Example 13 of Example 5 was replaced with the composite adhesive prepared in Example 17, and all other operations were the same as in Example 5.

[0058] Comparative Example 5: A washable nonwoven fabric pearl jacquard process includes the following steps: The composite adhesive prepared in Example 5 with 6 parts by weight of Preparation Example 13 was replaced with the composite adhesive prepared in Preparation Example 13 with 12 parts by weight of Preparation Example 13, and other operations were kept the same as in Example 5.

[0059] Comparative Example 6: A washable nonwoven fabric pearl jacquard process includes the following steps: The composite adhesive prepared in Example 5 with 6 parts by weight of Preparation Example 13 was replaced with 1 part by weight of Preparation Example 13, and all other operations were the same as in Example 5.

[0060] Performance testing: The properties of the washable pearl jacquard nonwoven fabrics prepared in Examples 1-5 and Comparative Examples 1-6 were tested, and the test results are shown in Table 1. The test method for dry longitudinal tensile force and dry transverse tensile force shall be adopted according to GB / T 24218.3-2010, wherein the sample width is 50 mm, the clamping distance is 100 mm, and the tensile speed is 100 mm / min; The wet longitudinal tensile agent is tested for wet transverse tensile strength according to the test method in GB / T 40181-2021, where the sample width is 50 mm, the clamping distance is 100 mm, and the tensile speed is 100 mm / min. Dispersion test: Sample pretreatment: According to the INDA / EDANA method, the sample to be tested is put into 20L of water and stirred for 30s; Water dispersibility test: Add 2L of water (water temperature 22±3°C) to the shaking chamber, shake at a frequency of 33rpm, start the shaking chamber and start timing, and record the time it takes for the sample to disintegrate. Disintegration is the separation of the first small piece of sample from the nonwoven fabric.

[0061] Table 1. Performance Testing

[0062] The test results in Table 1 show that the strength and dispersibility of the washable pearl jacquard nonwoven fabrics prepared in Examples 1-5 of this invention are good, while the washable pearl jacquard nonwoven fabrics prepared in Comparative Examples 1-6 have some shortcomings in performance.

[0063] The performance degradation in Comparative Example 1 may be due to the fact that ordinary lipases are directly exposed in the core, making them susceptible to chemical or physical damage from subsequent processes, leading to reduced enzyme activity. Immobilized lipases protect the enzyme structure and maintain their catalytic ability by activating the tea residue carrier; while ordinary enzymes, after losing carrier protection, are partially inactivated during microcapsule preparation, weakening their role in promoting degradation in composite binders, thereby reducing wet strength and dispersibility. The reason for the performance degradation in Comparative Example 2 may be that ethyl cellulose acts as a hydrophobic barrier to prevent the core mixture from contacting water too early. After removal, the lipase directly contacts the aqueous phase during subsequent chitosan / sodium alginate coating, resulting in partial dissolution and loss. The core mixture lacks a primary protective layer, leading to poor microcapsule integrity. It is prone to breakage during the mixing of composite adhesives or hydroentangling, reducing the reinforcing effect on fibers and dispersion efficiency. The reason for the performance reduction in Comparative Example 3 may be that chitosan and sodium alginate form a dense outer layer through electrostatic cross-linking. Without the protection of the outer layer, lipase is released prematurely during the preparation of the composite adhesive and cannot effectively degrade the fiber during dispersal. The chitosan / sodium alginate layer can enhance the binding force between the microcapsule and the fiber, and its wet strength decreases after removal. The reason for the performance degradation in Comparative Example 4 may be that the lipase in the microcapsule can continuously degrade the inter-fiber composite adhesive, accelerating dispersion; the microcapsule itself, as a rigid particle, fills the fiber network, improving dry / wet strength; after its absence, the composite adhesive relies solely on copolyester / carboxymethyl cellulose for binding force, which is prone to swelling and failure in the wet state, and there is no enzymatic degradation mechanism.

[0064] The performance degradation of Comparative Example 5 may be due to excessive composite adhesive leading to excessive bonding between fibers. Although it improves dry strength, it restricts fiber sliding, and stress concentration in wet conditions makes it prone to breakage. The lipase in the microcapsule needs to degrade more adhesive, prolonging the disintegration time. The additional composite adhesive thickens the fiber web, hinders water penetration, and delays dispersion. The performance degradation of Comparative Example 6 may be due to insufficient composite adhesive leading to insufficient hydrogen bonding and mechanical entanglement between fibers, making them prone to breakage in both dry and wet conditions; too little composite adhesive reduces its effectiveness; and weak fiber web bonding causes it to disintegrate rapidly upon contact with water, sacrificing its strength.

[0065] Based on the above, it is speculated that the dispersion of the washable pearl jacquard nonwoven fabric obtained by the present invention may include the following processes: First stage: Under the dual action of large water flow and turbulent shear force, the alginate-chitosan composite membrane on the outer layer of the microcapsule rapidly absorbs water and swells, and its brittleness increases significantly; the mechanical impact force of the water flow easily causes the outer capsule wall to fracture brittlely, thereby destroying the inner ethyl cellulose protective layer, allowing the core material of the microcapsule to be released. Second stage: After the bilayer microcapsules rupture, the anhydrous sodium carbonate in the core mixture dissolves rapidly, and the local pH value changes from near neutral to alkaline around the polymer chains of the copolyester network backbone; at the same time, the immobilized lipase that was originally in a dormant state is also released into this high pH environment. The third stage: The alkaline environment accelerates the saponification and hydrolysis rate of ester bonds in the copolyester, causing the long polymer chains to break. At the same time, the activated lipases exhibit catalytic activity in this alkaline environment, attacking and cleaving ester bonds, forming a synergistic effect with alkaline-catalyzed hydrolysis. The dual catalytic action of chemical and biological processes causes the copolyester network, which is the main structural component, to undergo deep degradation in a very short time, disintegrating from a tough solid skeleton into water-soluble or water-dispersible oligomer fragments. Fourth stage: While the copolyester, which serves as the core skeleton, is destroyed, sodium carboxymethyl cellulose also dissolves rapidly in a large amount of water, losing its adhesive function; the simultaneous failure of the two major adhesive systems causes the internal bonding force of the nonwoven material to disappear instantly, and the entire structure disintegrates and eventually disperses into harmless, independent base fibers.

[0066] The embodiments described above provide a detailed explanation of the technical solutions and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed.

Claims

1. A washable nonwoven fabric pearl jacquard process, characterized in that, The process includes the following steps: Pretreated softwood pulp and pretreated lyocell fiber are mixed and stirred to obtain a mixed pulp; A composite slurry is obtained by adding a composite adhesive to the mixed slurry and stirring. The composite slurry is sequentially processed through inclined wire forming, hydroentangling, and vacuum dewatering to obtain a fiber web; The fiber web is embossed with a pearl-patterned roller to obtain the washable pearl jacquard nonwoven fabric.

2. The washable nonwoven pearl jacquard process as described in claim 1, characterized in that, The preparation method of the composite adhesive includes the following steps: ε-caprolactone, L-lactic acid and zinc lactate were reacted at 140℃ for 6-8 days to obtain a copolyester; The copolyester was dispersed in ethyl acetate to obtain an oil phase; Lecithin and sucrose esters were dispersed in deionized water to obtain an aqueous phase; The oil phase and aqueous phase were sequentially subjected to high-speed shear emulsification and rotary evaporation to obtain an emulsion; Sodium carboxymethyl cellulose was dispersed in deionized water to obtain a carboxymethyl cellulose solution; The composite adhesive was prepared by mixing a mixed emulsion, a carboxymethyl cellulose solution, and bilayer microcapsules and adjusting the pH to 5.5-6.

5.

3. The washable nonwoven pearl jacquard process as described in claim 2, characterized in that, The weight ratio of ε-caprolactone, L-lactic acid and zinc lactate is 25~38:10:0.035~0.

045.

4. The washable nonwoven pearl jacquard process as described in claim 2, characterized in that, The weight ratio of the copolyester, lecithin, and sucrose ester is 100:2~4:0.4~0.

6.

5. The washable nonwoven pearl jacquard process as described in claim 2, characterized in that, The preparation method of the bilayer microcapsules includes the following steps: After the pretreated tea residue was mixed and reacted with potassium hydroxide, it was soaked in a 2wt% citric acid solution to obtain acid-base treated tea residue. Activated tea residue is obtained by reacting acid-base treated tea residue with tris(hydroxymethyl)aminomethane. Immobilized lipase was obtained by mixing activated tea residue and lipase and reacting with a vortex reaction. Anhydrous sodium carbonate and immobilized lipase were mixed to obtain a core mixture; The core mixture is fluidized with hot air while being atomized and sprayed with a 5wt% ethyl cellulose ethanol solution to obtain an intermediate. The intermediate was dispersed in a 0.5 wt% chitosan solution and stirred, then dispersed in a 1 wt% sodium alginate solution, and 5 wt% calcium chloride solution was added dropwise with stirring to obtain the bilayer microcapsules.

6. The washable nonwoven pearl jacquard process as described in claim 3, characterized in that, The weight ratio of the pretreated tea residue to potassium hydroxide is 1:0.2~0.

3.

7. The washable nonwoven pearl jacquard process as described in claim 3, characterized in that, The weight ratio of the acid-base treated tea residue to tris(hydroxymethyl)aminomethane is 0.8~1.2:0.06~0.

08.

8. The washable nonwoven pearl jacquard process as described in claim 3, characterized in that, The weight ratio of anhydrous sodium carbonate to immobilized lipase is 3~4:10~15.

9. The washable nonwoven pearl jacquard process as described in claim 1, characterized in that, The weight ratio of the softwood pulp, lyocell fiber, and composite adhesive is 30~50:50~70:4~6.

10. The washable nonwoven pearl jacquard process as described in claim 1, characterized in that, The conditions for the embossing process include a processing temperature of 120°C, a linear pressure of 8 MPa, and an embossing time of 3 seconds.

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