A water-soluble functional wiping material and its preparation method and application

Abstract

The present invention discloses a water-soluble functional wiping material, which comprises the following raw material components by mass percentage: 80-95% water-soluble polyvinyl alcohol fiber and 5-20% microcapsule slow-release detergent; wherein the fineness of the water-soluble polyvinyl alcohol fiber is 2D×38mm, and the basis weight of the water-soluble functional wiping material is 40-80g / m 2 The wiping material has good wear resistance and water absorption when used at room temperature. After being soaked in water, the detergent is water-soluble, and no external detergent is needed. It has strong decontamination ability. The waste after use can be dissolved in hot water above 90°C, solving the problem of difficult waste disposal and being beneficial to the environment. It can be used as disposable wipes in household, industrial and medical fields.

Description

Technical Field

[0001] The invention belongs to the technical field of industrial textiles, and in particular relates to a water-soluble functional wiping material and a preparation method and application thereof. Background Art

[0002] With the improvement of living standards and the accelerated pace of life, people are becoming increasingly dependent on wiping materials. From infant care to adult care, from household wiping to workplace cleaning, from general equipment cleaning to precision instrument cleaning, wiping materials are ubiquitous in daily life and industrial production. Spunlace nonwovens have become a major material for wiping materials due to their simple processing, low cost, low lint removal, and softness that does not damage the surface of the wiped object.

[0003] As the use of wiping materials grows, the disposal of their waste has attracted global attention. The Director of External Relations and Sustainability at the European Nonwovens Association stated that nonwovens and related industries play a vital role in achieving the 2030 Sustainable Development Goals, demonstrating that the future development of wiping materials is inseparable from the theme and core of "sustainability." Currently, spunlace nonwovens are generally made from viscose and polyester fibers. Polyester fibers are non-biodegradable, while viscose fibers can be degraded, but require a specific environment and time to degrade, resulting in the problem of waste accumulation and disposal.

[0004] In addition to the research and development and promotion of advanced green non-woven wiping materials throughout their life cycle, the diversification and functionalization of wiping materials as end products is also a major development direction. Functions and differentiation such as sterilization, electrostatic wiping, cleaning, defogging, makeup removal, mosquito repellent, and sun protection will also become new hot spots and focuses of people's attention. In particular, providing upgraded functions such as sterilization and thorough cleaning is the focus of consumers. At present, the functionalization of wiping materials can be achieved by using functional fibers or non-woven materials for finishing. The cost of functional fibers is too high, and the fiber structure may be damaged during the hydroentanglement process, thereby affecting the performance of the function. The finishing method requires adhesives to improve the adhesion of functional materials. On the one hand, it will affect the increase in production speed. On the other hand, the hygienic performance of the product after adhesive treatment will be affected. In addition, the emission substances may not conform to the theme of sustainable development due to the presence of adhesives. Therefore, the output and quality of hydroentangled wiping materials will be affected.

[0005] Therefore, how to avoid using functional fibers or nonwoven materials to obtain water-soluble functional wiping materials has become an urgent problem to be solved. Summary of the Invention

[0006] The present invention aims to address the technical problems existing in the above-mentioned prior art. To this end, the present invention provides a water-soluble functional wiping material, its preparation method, and its application. Using water-soluble polyvinyl alcohol fibers as raw materials, the present invention uses a double-carding machine to prepare a two-layer fiber web. During the hydroentanglement process, the fiber web pore structure is controlled. A microcapsule sustained-release detergent is continuously added to the fiber web pore structure. The water-soluble functional wiping material is then formed into a single layer after low-temperature drying.

[0007] According to a first aspect of the present invention, a water-soluble functional wiping material is provided, wherein the water-soluble functional wiping material comprises the following raw material components by mass percentage: 80-95% water-soluble polyvinyl alcohol fiber, 5-20% microcapsule slow-release detergent; wherein the fineness of the water-soluble polyvinyl alcohol fiber is 2D×38mm, and the basis weight of the water-soluble polyvinyl alcohol fiber is 40-80g / m 2 .

[0008] In some embodiments of the present invention, the water-soluble functional wiping material comprises two layers of water-soluble polyvinyl alcohol webs, with a controllable three-dimensional network structure formed between the two layers. Microcapsules with a slow-release detergent are added to the three-dimensional network structure to form the product in one step. The three-dimensional network structure has a pore structure with adjustable pore size. Without a pore structure, forming the product in one step would be difficult. Post-processing makes it difficult for microcapsules to enter the web structure.

[0009] In some embodiments of the present invention, the microcapsule sustained-release detergent is prepared by the following method: using calcium alginate generated by the reaction of sodium alginate and calcium chloride as the wall material and ordinary detergent as the core material, and is prepared by in-situ polymerization; the particle size of the microcapsule sustained-release detergent is less than 5μm.

[0010] In some embodiments of the present invention, the water-soluble functional wiping material is soluble in hot water above 90°C.

[0011] According to a second aspect of the present invention, a method for preparing the above-mentioned water-soluble functional wiping material is provided, comprising the following steps:

[0012] (1) The first water-soluble polyvinyl alcohol fiber is subjected to rotary net hydroentanglement to obtain a first water-soluble polyvinyl alcohol fiber web after hydroentanglement, and is fed under a steel pipe in a flat net hydroentanglement area with a steel pipe support;

[0013] (2) feeding the second water-soluble polyvinyl alcohol fiber into the steel pipe above the flat mesh spunlace area and performing composite spunlace with the first water-soluble polyvinyl alcohol fiber web after spunlace obtained in step (1);

[0014] (3) continuously delivering the microcapsule slow-release detergent into the steel pipe, and forming the water-soluble functional wiping material in one step after drying.

[0015] In some embodiments of the present invention, the steel pipe support is composed of steel pipes arranged parallel to the width direction of the fiber web, and the axis of the steel pipe is parallel to the output direction of the fiber web; the microcapsule sustained-release detergent is continuously input into the flat mesh spunlace area from one end of the steel pipe, and then enters between the two layers of water-soluble polyvinyl alcohol fiber webs after composite spunlace from the other end of the steel pipe.

[0016] In some embodiments of the present invention, in step (1), the first water-soluble polyvinyl alcohol fiber is first opened, carded and laid before being subjected to rotary net hydroentanglement.

[0017] In some embodiments of the present invention, in step (2), the second water-soluble polyvinyl alcohol fiber is first opened and combed before being fed into the flat mesh hydroentanglement area above the steel pipe.

[0018] In some embodiments of the present invention, the spacing between the steel pipes is 10 to 30 mm, and the diameter of the steel pipes is 3 to 10 mm.

[0019] In some embodiments of the present invention, in step (3), the drying is performed in a three-layer flat-mesh drying room, with the temperature of the lower layer being 75-80°C, the temperature of the middle layer being 80-85°C, and the temperature of the upper layer being 85-88°C. The drying room is 6 meters long, and the water-soluble functional wiping material is wound after low-temperature drying. The low-temperature drying method can prevent the water-soluble functional wiping material from melting during the drying process.

[0020] The present invention adopts a one-step method of combining a double carding machine with a rotary screen and a flat screen hydroentanglement to prepare a water-soluble functional wiping material. The preparation method includes the following process steps:

[0021] One of the carding machines is equipped with a web laying device, which opens, mixes, and combs the first water-soluble polyvinyl alcohol fiber into a web, and cross-lays the formed fiber web, which is then sent to the bottom of the steel pipe in the flat net spunlace area with a steel pipe support after hydroentanglement through a rotary net; the other carding machine is not equipped with a web laying device, which opens, mixes, and combs the second water-soluble polyvinyl alcohol fiber into a web, to form a parallel fiber web, which is sent to the top of the steel pipe in the above-mentioned flat net spunlace area, and is composited with the cross-laid fiber web after hydroentanglement through hydroentanglement. The flat mesh spunlace area is required to set a series of parallel steel pipes with the same width as the fiber web output direction. During the spunlace process, the steel pipe part maintains two layers of fiber web, leaving a pore structure corresponding to the steel pipe size in the middle, and the two layers of fiber web in the part without the steel pipe are completely entangled to form a layer of fiber web, thereby forming a water-soluble non-woven material with controllable structure; while the spunlace fiber web moves forward, the microcapsule slow-release detergent is continuously input into the steel pipe in the flat mesh spunlace area from one end at the same speed as the fiber web, and then enters the pore structure of the spunlace non-woven material from the other end of the steel pipe and remains in the non-woven material. At the outlet end of the steel pipe, the pore structure of the fiber web is maintained by the light pressure of a grooved roller corresponding to the steel pipe, and the microcapsule slow-release detergent is not destroyed by any external pressure under the protection of the steel pipe; the wet water-soluble functional wiping material obtained by spunlace is sent to a three-layer flat mesh drying room for low-temperature drying, and finally cut and wound to form the water-soluble functional wiping material.

[0022] The water-soluble functional wiping material is composed of a three-dimensional network of water-soluble polyvinyl alcohol fibers with a controllable structure. The pores of this controllable structure are filled with microcapsules of a sustained-release detergent. During the hydroentanglement process, a rotary mesh is first used to solidify the cross-laid web, which then serves as a base layer before being combined with the parallel-laid web. During the hydroentanglement process, the microcapsules of sustained-release detergent are continuously fed into the steel pipe, preventing the sustained-release detergent from being destroyed by the pressure of the hydroentanglement needles. The steel pipe extends directly out of the hydroentanglement area. At the end of the steel pipe, a grooved roller corresponding to the steel pipe is used to gently press the spunlace nonwoven material to maintain the corresponding hole structure of the steel pipe. The nonwoven is then directly fed into a three-layer flat-mesh drying chamber for low-temperature drying.

[0023] According to the third aspect of the present invention, a water-soluble functional wiping material production equipment is proposed, which is used to perform the preparation method described in the second aspect of the present invention, including a loosening device, a carding device, a hydroentanglement device, a drying device, a trimming device and a winding device connected in sequence; the hydroentanglement device includes a rotary screen hydroentanglement machine and a flat screen hydroentanglement machine, and the rotary screen hydroentanglement machine is connected to the flat screen hydroentanglement machine; the flat screen hydroentanglement machine is provided with a steel pipe support, and the steel pipe support is composed of steel pipes arranged parallel to the width direction of the fiber web, and the axis of the steel pipe is parallel to the output direction of the fiber web.

[0024] In some embodiments of the present invention, the opening device includes a first opener and a second opener, and the combing device includes a first combing machine and a second combing machine, the first opener is connected to the first combing machine, and the second opener is connected to the second combing machine.

[0025] In some embodiments of the present invention, the first carding machine is connected to the rotary screen water spunlace machine, and the second carding machine is connected to the flat screen water spunlace machine; preferably, a cross-lapping machine is further provided between the first carding machine and the rotary screen water spunlace machine, and the cross-lapping machine conveys the fiber web output by the first carding machine to the rotary screen water spunlace machine, and the fiber web output by the rotary screen water spunlace machine enters under the steel pipe support of the flat screen water spunlace machine; a laying curtain is further provided between the second carding machine and the flat screen water spunlace machine, and the laying curtain conveys the fiber web output by the second carding machine to above the steel pipe support of the flat screen water spunlace machine.

[0026] The present invention also provides application of the water-soluble functional wiping material in disposable wiping materials.

[0027] According to a preferred embodiment of the present invention, there are at least the following beneficial effects:

[0028] 1. The present invention uses water-soluble polyvinyl alcohol fiber as raw material to prepare functional wiping materials. The waste after use can be dissolved with hot water. The product has no impact on the environment, saves land occupation and the time and cost of waste incineration, and has very considerable social and economic benefits.

[0029] 2. The present invention utilizes a microcapsule sustained-release detergent to be formed in one step and added to the spunlace nonwoven material. The product is soft and does not damage the surface of the wiped object or drop debris. No external detergent is required during use. It has strong decontamination ability and is easy to use.

[0030] 3. Adding microcapsule slow-release detergent during the hydroentanglement process allows the product to be formed in one step, simplifies functional finishing equipment, and the production speed is not affected by the post-finishing process, thereby reducing costs and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0032] Figure 1 This is a schematic cross-sectional view of the water-soluble functional wiping material prepared in Example 1 of the present invention.

[0033] Figure 2 Schematic diagram of the process flow of Example 1 of the present invention.

[0034] Figure 3 This is a schematic diagram of the fiber web being spunlace in the rotary screen and flat screen spunlace areas and dried in a three-layer flat screen drying room during the preparation process of Example 1 of the present invention.

[0035] Figure 4 Schematic diagram of water dissolution of water-soluble functional wiping material waste prepared in Example 1 of the present invention at room temperature.

[0036] Figure 5 Schematic diagram of the water dissolution of the water-soluble functional wiping material waste prepared in Example 1 of the present invention at 80°C.

[0037] Figure 6 This is a schematic diagram of the water dissolution of the water-soluble functional wiping material waste prepared in Example 1 of the present invention at 85°C.

[0038] Figure 7 Schematic diagram of the water dissolution of the water-soluble functional wiping material waste prepared in Example 1 of the present invention at 90°C.

[0039] Figure 8 This is a schematic diagram of the water dissolution of the water-soluble functional wiping material waste prepared in Example 1 of the present invention at 95°C.

[0040] Figure 9 Schematic diagram of the water dissolution of the water-soluble functional wiping material waste prepared in Example 1 of the present invention at 100°C.

[0041] Reference numerals:

[0042] 100. First opener; 110. Second opener; 120. Fiber conveyor curtain; 130. First carding machine; 140. Second carding machine; 150. Laying curtain; 160. Cross-lapper; 170. Rotary spunlace machine; 180. Flat spunlace machine; 190. Steel pipe; 200. Grooved roller; 210. Three-layer flat-net drying room; 220. Trimming machine; 230. Winding machine;

[0043] 171. First pre-wetting head; 172. First water jet head; 173. First vacuum water suction box; 181. Second pre-wetting head; 182. Second water jet head; 183. Second vacuum water suction box;

[0044] 240. Cross-lapped water-soluble polyvinyl alcohol fiber mesh; 250. Parallel-lapped water-soluble polyvinyl alcohol fiber mesh; 260. Microcapsule sustained-release detergent; 270. Lower mesh curtain; 280. Middle mesh curtain; 290. Upper mesh curtain; 300. Water-soluble functional wiping material. DETAILED DESCRIPTION

[0045] The following will clearly and completely describe the concept and technical effects of the present invention in conjunction with the embodiments, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention. Among them, the water-soluble polyvinyl alcohol fiber used in the examples is from Luxian Group.

[0046] Example 1

[0047] A water-soluble functional wiping material comprises the following raw material components by mass percentage: 83% water-soluble polyvinyl alcohol fiber and 17% microcapsule slow-release detergent; wherein the fineness of the water-soluble polyvinyl alcohol fiber is 2D×38mm, and the basis weight of the water-soluble functional wiping material is 60g / m 2 .

[0048] A method for preparing the water-soluble functional wiping material as described above comprises the following steps:

[0049] (1) The polyvinyl alcohol fibers are opened and mixed, combed into a web, and cross-laid to form a fiber web, which is then sent to the rotary mesh spunlace area, pre-wetted, and then entangled through four spunlaces with water pressures of 3 MPa, 5 MPa, 5 MPa, and 5 MPa, respectively. The fibers are then sent to the flat mesh spunlace area with a steel pipe support under the steel pipe.

[0050] (2) The polyvinyl alcohol fibers are opened, mixed, and combed into a web to form a layer of parallel fiber webs, which are then fed into the flat mesh spunlace area above the steel pipe with a steel pipe support. After pre-wetting, they are entangled with the cross-fiber webs entangled in the round mesh spunlace area through four spunlaces. The water pressures are 3MPa, 5MPa, 7MPa, and 7MPa, respectively. In the steel pipe support part, the water needle rebounds after encountering the steel pipe, and a pore structure corresponding to the diameter of the steel pipe is formed between the two layers of fiber webs. In the part without the steel pipe, the two layers of fiber webs are tightly entangled into a layer of fiber web, thus forming a water-soluble pore structure non-woven material; the diameter of the steel pipe is 5mm, and the average arrangement interval is 15mm.

[0051] (3) During the hydroentanglement process, the web runs at a speed of 80 m / min, and the microcapsule slow-release detergent is continuously fed into the steel pipe at the same speed. Due to the protective effect of the steel pipe in the hydroentanglement area, the microcapsule slow-release detergent is not affected. After leaving the hydroentanglement area, it enters the pore structure of the water-soluble nonwoven material from the outlet end of the steel pipe. Above the outlet end of the steel pipe, a grooved roller corresponding to the arrangement size of the steel pipe gently presses the web, which can maintain the pore structure in the web and allow the microcapsule slow-release detergent to enter the pore structure smoothly.

[0052] (4) The wet water-soluble functional wiping material is sent to a three-layer flat mesh drying room with a length of 6 meters for low-temperature drying. The temperature of the lower layer is set to 80°C, the temperature of the middle layer is set to 82°C, and the temperature of the upper layer is set to 88°C. The drying hot air flow velocity is 2m / s. Since there is no external force during the low-temperature hot air drying process, the moisture is removed from the functional wiping material by the hot air, and the state of the microcapsule slow-release detergent in the pore structure of the water-soluble nonwoven material does not change. After trimming and winding, the water-soluble functional wiping material is formed.

[0053] According to "GB / T 24218.1-2009 Textiles - Test methods for nonwoven fabrics - Part 1: Determination of mass per unit area", the basis weight is 60 g / m 2 According to "GB / T 24218.3-2010 Textiles - Nonwovens - Test Methods - Part 3: Determination of breaking strength and elongation at break", the longitudinal breaking strength was 69.3N / 5cm, the elongation at break was 35%, the transverse breaking strength was 86.2N / 5cm, and the elongation at break was 33%; according to "GB / T21196.2-2007 Textiles - Determination of abrasion resistance of fabrics by the Martindale method - Part 2: Determination of specimen damage", the abrasion number was 182.

[0054] The cross section of the water-soluble functional wiping material is as follows Figure 1 shown.

[0055] A process flow of a water-soluble functional wiping material, such as Figure 2 As shown, the following steps are included:

[0056] The first opener 100 opens the mixed polyvinyl alcohol fibers, which are fed into the first carding machine 130 through the fiber conveying curtain 120, and then are laid out by the cross-lapping machine 160 and sent to the rotary net spunlace machine 170 for spunlace, and then sent to the bottom of the flat net spunlace machine 180 steel pipe 190; the second opener 110 opens the mixed polyvinyl alcohol fibers and feeds them into the second carding machine 140, which is conveyed to the top of the flat net spunlace machine 180 steel pipe 190 through the laying curtain 150, and is compounded with the lower fiber web to undergo flat net spunlace to form a pore structured spunlace non-woven material. Microcapsule slow-release cleaning agent can be continuously fed into the inlet end of the steel pipe 190, and the pore structure is maintained under the light pressure of the grooved roller 200, ensuring that the microcapsule slow-release cleaning agent smoothly enters the pore structure of the spunlace non-woven material from the outlet end of the steel pipe 110 to form a wet water-soluble functional wiping material, and then enters the three-layer flat mesh drying room 210 for low-temperature drying, and then is cut by the trimming machine 220 and then wound into a one-way moisture-conducting, moisture-absorbing and quick-drying spunlace non-woven material by the winding machine 230.

[0057] The polyvinyl alcohol fiber web is spunlace in the rotary screen and flat screen spunlace area and dried in the three-layer flat screen drying room, such as Figure 3 As shown, the following steps are included:

[0058] The cross-laid polyvinyl alcohol fiber web 240 is pre-wetted by the first pre-wetting head 171 in the rotary screen water entanglement, and then is hydroentangled by the four first water entanglement heads 172 arranged circumferentially. The water pressure setting gradually increases from back to front, and is transported to the bottom of the steel pipe 190 in the flat screen water entanglement machine 180 under the suction action of the first vacuum water suction box 173; the parallel-laid polyvinyl alcohol fiber web 250 is sent to the top of the steel pipe 190 of the flat screen water entanglement machine 180, and after being pre-wetted by the second pre-wetting head 181, it is composited with the polyvinyl alcohol fiber web below the steel pipe 190 under the second water entanglement head 182. Microcapsule slow-release cleaning agent 260 is continuously input into 190, and the steel pipe 190 extends all the way to the front end of the grooved roller 200. The pore structure of the non-woven material is maintained under the light pressure of the grooved roller 200 and the flat mesh curtain. The microcapsule slow-release cleaning agent 260 smoothly enters the pore structure of the non-woven material and is retained before entering the three-layer flat mesh drying room 210. Under the conveying action of the lower mesh curtain 270, the middle mesh curtain 280 and the upper mesh curtain 290, it is dried at 75-88°C to form a one-way moisture-conducting, moisture-absorbing and quick-drying non-woven material 300, which is finally formed into a finished product after trimming and winding.

[0059] Example 2

[0060] A water-soluble functional wiping material comprises the following raw material components by mass percentage: 90% water-soluble polyvinyl alcohol fiber and 10% microcapsule slow-release detergent; wherein the fineness of the water-soluble polyvinyl alcohol fiber is 2D×38mm, and the quantitative weight of the water-soluble functional wiping material is 60g / m 2 .

[0061] A method for preparing the water-soluble functional wiping material as described above comprises the following steps:

[0062] (1) The polyvinyl alcohol fibers are opened and mixed, combed into a web, and cross-laid to form a fiber web, which is then sent to the rotary mesh spunlace area, pre-wetted, and then entangled through four spunlaces with water pressures of 3MPa, 5MPa, 5MPa, and 7MPa, respectively. The fibers are then sent to the flat mesh spunlace area with a steel pipe support under the steel pipe.

[0063] (2) The polyvinyl alcohol fibers are opened, mixed, and combed into a web to form a layer of parallel fiber webs, which are then fed into the flat mesh spunlace area above the steel pipe with a steel pipe support. After pre-wetting, they are entangled with the cross-fiber webs entangled in the round mesh spunlace area through four spunlaces. The water pressures are 5 MPa, 7 MPa, 7 MPa, and 9 MPa, respectively. In the steel pipe support part, the water needle rebounds after encountering the steel pipe, and a pore structure corresponding to the diameter of the steel pipe is formed between the two layers of fiber webs. In the part without the steel pipe, the two layers of fiber webs are tightly entangled into a layer of fiber web, thus forming a water-soluble pore structure non-woven material; the diameter of the steel pipe is 5 mm, and the average arrangement interval is 20 mm.

[0064] (3) During the hydroentanglement process, the web runs at a speed of 60 m / min, and the microcapsule slow-release detergent is continuously fed into the steel pipe at the same speed. Due to the protective effect of the steel pipe in the hydroentanglement area, the microcapsule slow-release detergent is not affected. After leaving the hydroentanglement area, it enters the pore structure of the water-soluble nonwoven material from the outlet end of the steel pipe. Above the outlet end of the steel pipe, a grooved roller corresponding to the arrangement size of the steel pipe gently presses the web, which can maintain the pore structure in the web and allow the microcapsule slow-release detergent to enter the pore structure smoothly.

[0065] (4) The wet water-soluble functional wiping material is sent to a three-layer flat mesh drying room with a length of 6 meters for low-temperature drying. The temperature of the lower layer is set to 78°C, the temperature of the middle layer is set to 80°C, and the temperature of the upper layer is set to 85°C. The drying hot air flow speed is 2m / s. Since there is no external force during the low-temperature hot air drying process, the moisture is removed from the functional wiping material by the hot air, and the state of the microcapsule slow-release detergent in the pore structure of the water-soluble non-woven material does not change. After trimming and winding, the water-soluble functional wiping material is formed.

[0066] According to "GB / T 24218.1-2009 Textiles - Test methods for nonwoven fabrics - Part 1: Determination of mass per unit area", the basis weight is 60 g / m 2 According to "GB / T 24218.3-2010 Textiles - Nonwovens - Test Methods - Part 3: Determination of breaking strength and elongation at break", the longitudinal breaking strength was 78.6N / 5cm, the elongation at break was 33%, the transverse breaking strength was 97.4N / 5cm, and the elongation at break was 31%; according to "GB / T21196.2-2007 Textiles - Determination of abrasion resistance of fabrics by the Martindale method - Part 2: Determination of specimen damage", the abrasion number was 212.

[0067] Example 3

[0068] A water-soluble functional wiping material comprises the following raw material components by mass percentage: 95% water-soluble polyvinyl alcohol fiber and 5% microcapsule slow-release detergent; wherein the fineness of the water-soluble polyvinyl alcohol fiber is 2D×38mm, and the quantitative weight of the water-soluble functional wiping material is 60g / m 2 .

[0069] A method for preparing the water-soluble functional wiping material as described above comprises the following steps:

[0070] (1) The polyvinyl alcohol fibers are opened and mixed, combed into a web, and cross-laid to form a fiber web, which is then sent to the rotary mesh spunlace area, pre-wetted, and then entangled through four spunlaces with water pressures of 3MPa, 5MPa, 7MPa, and 9MPa, respectively. The fibers are then sent to the flat mesh spunlace area with a steel pipe support under the steel pipe.

[0071] (2) The polyvinyl alcohol fibers are opened, mixed, and combed into a web to form a layer of parallel fiber webs, which are then fed into the flat mesh spunlace area above the steel pipe with a steel pipe support. After pre-wetting, they are entangled with the cross-fiber web entangled in the round mesh spunlace area through four spunlaces. The water pressures are 5 MPa, 7 MPa, 9 MPa, and 9 MPa, respectively. In the steel pipe support part, the water needle rebounds after encountering the steel pipe, and a pore structure corresponding to the diameter of the steel pipe is formed between the two layers of fiber webs. In the part without the steel pipe, the two layers of fiber webs are tightly entangled into a layer of fiber web, thus forming a water-soluble pore structure non-woven material. The diameter of the steel pipe is 5 mm, and the average arrangement interval is 25 mm.

[0072] (3) During the hydroentanglement process, the web runs at a speed of 80 m / min, and the microcapsule slow-release detergent is continuously fed into the steel pipe at the same speed. Due to the protective effect of the steel pipe in the hydroentanglement area, the microcapsule slow-release detergent is not affected. After leaving the hydroentanglement area, it enters the pore structure of the water-soluble nonwoven material from the outlet end of the steel pipe. Above the outlet end of the steel pipe, a grooved roller corresponding to the arrangement size of the steel pipe gently presses the web, which can maintain the pore structure in the web and allow the microcapsule slow-release detergent to enter the pore structure smoothly.

[0073] (4) The wet water-soluble functional wiping material is sent to a three-layer flat mesh drying room with a length of 6 meters for low-temperature drying. The temperature of the lower layer is set to 80°C, the temperature of the middle layer is set to 85°C, and the temperature of the upper layer is set to 88°C. The drying hot air flow speed is 3m / s. Since there is no external force during the low-temperature hot air drying process, the moisture is removed from the functional wiping material by the hot air, and the state of the microcapsule slow-release detergent in the pore structure of the water-soluble non-woven material does not change. After trimming and winding, the water-soluble functional wiping material is formed.

[0074] According to "GB / T 24218.1-2009 Textiles - Test methods for nonwoven fabrics - Part 1: Determination of mass per unit area", the basis weight is 60 g / m 2 According to "GB / T 24218.3-2010 Textiles - Nonwovens - Test Methods - Part 3: Determination of breaking strength and elongation at break", the longitudinal breaking strength was 87.4N / 5cm, the elongation at break was 38%, the transverse breaking strength was 102.6N / 5cm, and the elongation at break was 36%; according to "GB / T21196.2-2007 Textiles - Determination of abrasion resistance of fabrics by the Martindale method - Part 2: Determination of specimen damage", the abrasion number was 248.

[0075] Test example

[0076] The water-soluble functional wiping material prepared in Example 1 of the present invention was cut into small pieces and placed in a cup of cold water. After soaking for 2 minutes, the microcapsule sustained-release detergent dissolved in the water. The water-soluble functional wiping material was taken out of the water, and excess water was lightly squeezed out and wiped on the surface to be cleaned. The stains on the surface of the object could be easily removed.

[0077] Figures 4 to 9 The water-soluble functional wiping material after decontamination is placed in hot water for water solubility test. At room temperature, the waste of water-soluble functional wiping material is insoluble in water, but it can absorb water and swell. Figure 4 As shown in the figure, the water temperature gradually rises from 80℃ to 100℃. With the increase of temperature and heating time, the water-soluble functional wiping material waste gradually dissolves in water and eventually completely dissolves in water and disappears. At 80℃ and 85℃, even if the heating time is as long as 15 minutes, the water-soluble functional wiping material waste does not dissolve in water. It just gradually dissolves into fibers and evenly disperses in hot water as the stirring proceeds. Therefore, it cannot dissolve in hot water below 85℃. Figure 5 、 Figure 6 When the water-soluble functional wiping material waste is placed in 90℃ hot water, it is obvious that the wipe shrinks rapidly. After 15 minutes, the PVA fibers are no longer visible in the hot water, but the aqueous solution is turbid, as shown in the figure. Figure 7 When the water-soluble functional wiping material waste is put into 95℃ hot water, the wiping material shrinks faster and becomes a turbid liquid after 10 minutes, and no fibers can be seen. After 15 minutes, the solution becomes clear, indicating that the water-soluble functional wiping material waste has been completely dissolved in water. Figure 8 When the waste of water-soluble functional wiping material is put into 100℃ hot water, the wiping material will immediately dissolve and shrink into small pieces. After 5 minutes, the solution has become clear, indicating that it has been completely dissolved in water. Figure 9 Therefore, the water-soluble functional wiping material waste can be dissolved in 90°C hot water. As the water temperature rises, the dissolution rate increases and the time becomes shorter.

[0078] While the embodiments of the present invention have been described in detail above with reference to the accompanying drawings, the present invention is not limited to the embodiments described above. Various modifications may be made within the scope of knowledge possessed by a person skilled in the art without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof may be combined with one another unless there is a conflict.

Claims

1. A water-soluble functional wiping material, characterized in that: The water-soluble functional wiping material comprises the following raw material components by mass percentage: 80-95% water-soluble polyvinyl alcohol fiber and 5-20% microcapsule slow-release detergent; wherein the fineness of the water-soluble polyvinyl alcohol fiber is 2D×38mm, and the quantitative weight of the water-soluble functional wiping material is 40-80g / m 2 ; The preparation method of the water-soluble functional wiping material comprises the following steps: (1) The first water-soluble polyvinyl alcohol fiber is subjected to rotary net hydroentanglement to obtain a first water-soluble polyvinyl alcohol fiber web after hydroentanglement, and is fed under a steel pipe in a flat net hydroentanglement area with a steel pipe support; (2) feeding the second water-soluble polyvinyl alcohol fiber into the steel pipe above the flat mesh spunlace area and performing composite spunlace with the first water-soluble polyvinyl alcohol fiber web after spunlace obtained in step (1); (3) continuously delivering the microcapsule slow-release detergent into the steel pipe, and forming the microcapsule into a water-soluble functional wiping material after drying.

2. The water-soluble functional wiping material according to claim 1, characterized in that: The water-soluble functional wiping material comprises two layers of water-soluble polyvinyl alcohol fiber webs, a three-dimensional network structure with controllable structure is formed between the two layers of water-soluble polyvinyl alcohol fiber webs, and a microcapsule slow-release detergent is added to the three-dimensional network structure to form the material in one step.

3. The water-soluble functional wiping material according to claim 1 or 2, characterized in that: The water-soluble functional wiping material is soluble in hot water above 90°C.

4. A method for preparing the water-soluble functional wiping material according to any one of claims 1 to 2, characterized in that: The following steps are involved: (1) The first water-soluble polyvinyl alcohol fiber is subjected to rotary net hydroentanglement to obtain a first water-soluble polyvinyl alcohol fiber web after hydroentanglement, and is fed under a steel pipe in a flat net hydroentanglement area with a steel pipe support; (2) feeding the second water-soluble polyvinyl alcohol fiber into the steel pipe above the flat mesh spunlace area and performing composite spunlace with the first water-soluble polyvinyl alcohol fiber web after spunlace obtained in step (1); (3) continuously delivering the microcapsule slow-release detergent into the steel pipe, and forming the microcapsule into a water-soluble functional wiping material after drying.

5. The preparation method according to claim 4, characterized in that The steel pipe support is composed of steel pipes arranged parallel to the width direction of the fiber web, and the axis of the steel pipe is parallel to the output direction of the fiber web; the microcapsule sustained-release detergent is continuously input into the flat mesh spunlace area from one end of the steel pipe, and then enters between the two layers of water-soluble polyvinyl alcohol fiber webs after composite spunlace from the other end of the steel pipe.

6. The preparation method according to claim 4, characterized in that In step (1), the first water-soluble polyvinyl alcohol fiber is first opened, carded and laid before being subjected to rotary net hydroentanglement.

7. The preparation method according to claim 4, characterized in that The spacing between the steel pipes is 10 to 30 mm, and the diameter of the steel pipes is 3 to 10 mm.

8. The preparation method according to claim 4, characterized in that In step (3), the drying is carried out in a three-layer flat-net drying room, with the temperature of the lower layer being 75-80°C, the temperature of the middle layer being 80-85°C, and the temperature of the upper layer being 85-88°C.

9. A water-soluble functional wiping material production device, used to perform the preparation method according to any one of claims 4 to 8, characterized in that: It includes a loosening device, a carding device, a spunlace device, a drying device, a trimming device and a winding device connected in sequence; the spunlace device includes a rotary screen spunlace machine and a flat screen spunlace machine, and the rotary screen spunlace machine is connected to the flat screen spunlace machine; the flat screen spunlace machine is provided with a steel pipe support, and the steel pipe support is composed of steel pipes arranged parallel to the width direction of the fiber web, and the axis of the steel pipe is parallel to the output direction of the fiber web.

10. Use of the water-soluble functional wiping material according to any one of claims 1 to 3 in disposable wiping materials.

Images