Ultrafine bio-based hydrolysis-resistant non-woven fabric for wiping and preparation method of superfine bio-based hydrolysis-resistant non-woven fabric

Abstract

The invention relates to the technical field of non-woven fabrics, in particular to a superfine bio-based hydrolysis-resistant wiping non-woven fabric and a preparation method thereof.The non-woven fabric at least comprises a composite layer, the composite layer comprises a bio-based hydrolysis-resistant layer, fluff pulp fibers are embedded in the bio-based hydrolysis-resistant layer, and the fluff pulp fibers are made of polyester fibers. And the fluff pulp fibers are self-adhered to the bio-based hydrolysis-resistant layer. According to the superfine bio-based hydrolysis-resistant non-woven fabric for wiping, the fluff pulp fibers are embedded into the bio-based hydrolysis-resistant layer, and the fluff pulp and the bio-based hydrolysis-resistant layer are self-bonded, so that the fibers and particles do not fall off. In addition, due to the design of the mixed fluff pulp, the material can absorb water and contain water due to a track-and-track pore structure, and the water absorption property and the water-containing property of the material are improved.

Description

Technical Field

[0001] The invention relates to the technical field of nonwoven fabrics, and in particular to an ultra-fine bio-based hydrolysis-resistant wiping nonwoven fabric and a preparation method thereof. Background Art

[0002] Nonwoven fabrics have a wide range of applications, including beauty, hygiene, wiping, household and fast-moving consumer goods, and are mostly disposable products. Currently, the most widely used nonwoven fabrics on the market are spunlace nonwoven fabrics, which are usually made of a blend of cellulose fiber and polyester staple fiber, and are formed by high-pressure spunlace reinforcement and drying. The process is long, the water consumption is large, and the energy consumption is high. It is estimated that the water consumption of the spunlace entanglement process is 200 tons / day. If there is no water circulation system, the water consumption is as high as 4,000 tons / day, and the energy consumption is usually 2,500kWh / ton. In addition, the raw materials are non-degradable. Recently, pure cotton and 100% cellulose fiber spunlace nonwoven fabrics have been launched, which have high energy consumption and processing costs.

[0003] In addition, none of the nonwoven fiber webs in the prior art involve solutions related to anti-hydrolysis. Summary of the invention

[0004] In view of the shortcomings of the prior art mentioned above, the purpose of the present invention is to provide an ultra-fine bio-based hydrolysis-resistant wiping non-woven fabric and a preparation method thereof, in order to address the problems that the spunlace non-woven fabrics used on the market have high energy consumption, most of the materials are non-biodegradable and are prone to hydrolysis.

[0005] To achieve the above-mentioned purpose and other related purposes, the present invention provides, on the one hand, an ultra-fine bio-based anti-hydrolysis wiping non-woven fabric, wherein the non-woven fabric comprises at least a composite layer, wherein the composite layer comprises a bio-based anti-hydrolysis layer, wherein fluff pulp fibers are embedded in the bio-based anti-hydrolysis layer, and the fluff pulp fibers are self-adhesive to the bio-based anti-hydrolysis layer.

[0006] The second aspect of the present invention provides a method for preparing an ultra-fine bio-based anti-hydrolysis wiping non-woven fabric, comprising crushing a fluff pulp board through open feeding, and rapidly cutting the obtained fluff pulp fibers into a bio-based anti-hydrolysis layer under the action of airflow for thermal mixing to form a composite layer to provide a non-woven fabric.

[0007] The third aspect of the present invention provides the use of the ultra-fine bio-based hydrolysis-resistant wiping nonwoven fabric described in the first aspect of the present invention in the fields of beauty, hygiene, wiping, household and fast-moving consumer goods.

[0008] Compared with the prior art, the present invention has the following beneficial effects:

[0009] The ultra-fine bio-based hydrolysis-resistant wiping nonwoven fabric of the present application embeds fluff pulp fibers into a bio-based hydrolysis-resistant layer and relies on the self-adhesion of the fluff pulp fibers and the bio-based hydrolysis-resistant layer to prevent the fibers and particles from falling off. In addition, the design of the mixed fluff pulp fibers and the tortuous pore structure enable the material to absorb water and contain more water, thereby improving the water absorption and water content of the material. In a further preferred embodiment, the hydrolysis-resistant formula of the present application is optimized.

[0010] The present application also provides a method for preparing ultra-fine bio-based hydrolysis-resistant nonwovens for wiping, and proposes to use a melt-blown hot-mixing process to process bio-based ultrafine fibers and fluff pulp fiber composite wiping materials. In addition, the bio-based melt-blown materials are not resistant to hydrolysis and have a short shelf life, so the anti-hydrolysis problem of the hot-mixed nonwovens is improved, and the shelf life of the wiping materials is extended, thereby solving the problems in the prior art. Specifically, the new nonwoven processing technology of the present application has an energy consumption of 1300kWh / ton, which can significantly reduce energy consumption. It uses a pure bio-based melt-blown processing technology, and the fineness is 1 / 8 of that of traditional spunlace nonwovens. It has a delicate hand feel, and innovatively adds an anti-hydrolysis formula to solve the problem of hydrolysis of bio-based materials during storage, especially degradation under neutral, acidic, and alkaline conditions, extending the shelf life and facilitating consumer use. The material is completely biodegradable, environmentally friendly, and pollution-free. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 Shown is a diagram of the apparatus for the meltblowing hot hybrid process.

[0012] Figure 2 Shown are the structural diagrams of the bio-based hydrolysis-resistant wiping nonwoven fabrics in Example 1 and Example 2.

[0013] Figure 3 Shown is the structure diagram of the bio-based hydrolysis-resistant wiping nonwoven fabric of Example 3.

[0014] Figure 4 Shown are structural diagrams of bio-based hydrolysis-resistant wiping nonwoven fabrics of Examples 4 to 6. DETAILED DESCRIPTION

[0015] "Scope" disclosed in the present application is limited in the form of lower limit and upper limit, and a given range is limited by selecting a lower limit and an upper limit, and the selected lower limit and upper limit define the boundary of a special range. The scope limited in this way can be including end values ​​or not including end values, and can be arbitrarily combined, that is, any lower limit can be combined with any upper limit to form a scope. For example, if the scope of 60-120 and 80-110 is listed for a specific parameter, it is understood that the scope of 60-110 and 80-120 is also expected. In addition, if the minimum range values ​​1 and 2 are listed, and if the maximum range values ​​3, 4 and 5 are listed, the following scope can be all expected: 1-3, 1-4, 1-5, 2-3, 2-4 and 2-5. In the present application, unless otherwise specified, the numerical range "ab" represents the abbreviation of any real number combination between a and b, wherein a and b are real numbers. For example, the numerical range "0-5" means that all real numbers between "0-5" are listed in this document, and "0-5" is just an abbreviation of these numerical combinations. In addition, when a parameter is expressed as an integer ≥ 2, it is equivalent to disclosing that the parameter is, for example, an integer of 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0016] If there is no special explanation, all steps of the present application can be performed sequentially or randomly, preferably sequentially. For example, the method includes steps 1) and 2), which means that the method may include steps 1) and 2) performed sequentially, or may include steps 2) and 1) performed sequentially.

[0017] At present, the biodegradable materials on the market mainly include PLA, PBAT, PBS, PHA, PCL, PGA, etc. They are all ester compounds with ester (-COOR) functional groups on the molecular chain. They are easily degraded under the action of water, enzymes, etc., and then transformed by microorganisms, and finally become water and carbon dioxide. Biodegradable materials have their advantages in performance, practicality, degradability, safety, etc. At the same time, the synthetic raw materials of some biodegradable materials can be obtained by biomass fermentation extraction, reducing the use of fossil energy, which is in line with the concept of sustainable development. However, biodegradable materials have poor hydrolysis resistance and are prone to hydrolysis under high temperature and humidity, resulting in a decrease in mechanical properties and ultimately loss of performance.

[0018] Anti-hydrolysis agents can inhibit the molecular chain breakage and comprehensive physical property degradation caused by hydrolysis of polymers, maintain excellent mechanical properties and chemical stability, effectively improve the hydrolysis resistance of plastic products, and ensure the long-term service life of plastic products. They are widely used in the fields of automobiles, electronics, aerospace, etc. In the field of non-woven fabrics, especially the melt-spinning wiping field mentioned in the present invention, melt-blown and spunbond non-woven fabric technology have high requirements for the processing of bio-based resin melt index, requiring the resin to have good spinnability and uniform filament formation. At the same time, the requirements for the dispersion of the processing masterbatch are also high, and it is compatible with the bio-based resin material. Through a large number of screening experiments and performance verification, the present invention finds that a specific type of anti-hydrolysis masterbatch and bio-based nucleating agent need to be used in combination to achieve the best effect, and then synergistically, which can not only meet the spinning requirements, unbroken filaments, good fiber-forming performance, but also meet the anti-hydrolysis performance and improve the mechanical stability of the material.

[0019] The problems solved and solutions proposed by the patent of this invention are: 1. Processing of ultra-fine bio-based wiping materials, using meltblown non-woven bio-based materials; 2. Improving the water absorption and water content of the material, designing hot mixed fluff pulp, and the tortuous pore structure enable the material to absorb more water and hold more water; 3. Preparation of hydrolysis-resistant formula of bio-based materials; 4. Multi-layer embedded non-woven structure design, fibers and particles do not shed.

[0020] Based on this, the inventor completed this application.

[0021] Hereinafter, embodiments of the ultra-fine bio-based hydrolysis-resistant wiping nonwoven fabric and the preparation method thereof of the present invention are specifically disclosed in detail.

[0022] Ultra-fine bio-based hydrolysis-resistant nonwoven fabric for wiping

[0023] One aspect of the present invention provides an ultra-fine bio-based anti-hydrolysis wiping non-woven fabric, the non-woven fabric at least comprising a composite layer, the composite layer comprising a bio-based anti-hydrolysis layer, the bio-based anti-hydrolysis layer having fluff pulp fibers embedded therein, the fluff pulp fibers being self-adhered to the bio-based anti-hydrolysis layer.

[0024] In the composite layer of the present invention, the material of the bio-based anti-hydrolysis layer is selected from bio-based anti-hydrolysis materials for bonding, wherein the bio-based anti-hydrolysis materials for bonding are selected from a combination of a first bio-based material and an anti-hydrolysis masterbatch, or a combination of a second bio-based material, a second bio-based nucleating agent and a second anti-hydrolysis agent.

[0025] When the bio-based anti-hydrolysis material for bonding is selected from a combination of a first bio-based material and an anti-hydrolysis masterbatch, the first bio-based material is selected from a combination of polylactic acid (PLA), polybutylene terephthalate-adipate (PBAT), polybutylene succinate (PBS), polyhydroxyalkanoate (PHA), polycaprolactone (PCL), polyglycolic acid (PGA) or one or more. The anti-hydrolysis masterbatch includes a third bio-based material, a first bio-based nucleating agent and a first anti-hydrolysis agent, and the third bio-based material, the first bio-based nucleating agent and the first anti-hydrolysis agent are prepared into a bio-based anti-hydrolysis masterbatch through blending and compounding.

[0026] The first bio-based nucleating agent can be selected from, for example, a combination of one or more of a polysaccharide nucleating agent, a phenolic nucleating agent, an alcohol nucleating agent, a protein nucleating agent, and a carboxylic acid nucleating agent. Among them, the polysaccharide nucleating agent is selected from a combination of one or more of starch, cellulose, chitin, chitosan, and cyclodextrin. The phenolic nucleating agent can be selected from, for example, lignin. The alcohol nucleating agent can be selected from, for example, inositol. The protein nucleating agent can be selected from, for example, amino acids. The carboxylic acid nucleating agent can be selected from, for example, orotic acid.

[0027] The first anti-hydrolysis agent is selected from one or a combination of monoepoxy glycidyl ester, diepoxy glycidyl ester, epoxy soybean oil, isocyanate glycidyl ester, monomeric carbodiimide, aliphatic carbodiimide and aromatic carbodiimide.

[0028] The third bio-based material is selected from one or more combinations of polylactic acid (PLA), polybutylene terephthalate-adipate (PBAT), polybutylene succinate (PBS), polyhydroxyalkanoate (PHA), polycaprolactone (PCL), and polyglycolic acid (PGA).

[0029] Calculated by the weight percentage of the component in the bio-based anti-hydrolysis material for bonding, the first anti-hydrolysis agent accounts for 0.5% to 2% of the total weight of the bio-based anti-hydrolysis material for bonding, preferably 0.8% to 1.5%; calculated by the weight percentage of the component in the bio-based anti-hydrolysis material for bonding, the first bio-based nucleating agent accounts for 0.05% to 1% of the total weight of the bio-based anti-hydrolysis material for bonding, preferably 0.1% to 0.3%.

[0030] Optionally, the anti-hydrolysis masterbatch may further include a first antibacterial masterbatch, wherein the weight percentage of the first antibacterial masterbatch to the anti-hydrolysis masterbatch may be, for example, 1% to 10%, 1% to 5%, 5% to 10%, 1% to 3%, 3% to 5%, 5% to 8% or 8% to 10%. The first antibacterial masterbatch may be directly commercially available.

[0031] The weight percentage of the anti-hydrolysis masterbatch in the bio-based anti-hydrolysis material for bonding is 5-50%, preferably 10-30%.

[0032] When the bio-based anti-hydrolysis material for bonding is a combination of a second bio-based material, a second bio-based nucleating agent and a second anti-hydrolysis agent, the weight percentage of the second bio-based material in the bio-based anti-hydrolysis material for bonding is 97% to 99%. The weight percentage of the second bio-based nucleating agent in the bio-based anti-hydrolysis material for bonding is 0.05% to 1%. The weight percentage of the second anti-hydrolysis agent in the bio-based anti-hydrolysis material for bonding is 0.5% to 2%.

[0033] The second bio-based nucleating agent can be selected from a combination of one or more of polysaccharide nucleating agents, phenolic nucleating agents, alcohol nucleating agents, protein nucleating agents, and carboxylic acid nucleating agents. Among them, the polysaccharide nucleating agent is selected from a combination of one or more of starch, cellulose, chitin, chitosan, and cyclodextrin. The phenolic nucleating agent can be selected from lignin, for example. The alcohol nucleating agent can be selected from inositol, for example. The protein nucleating agent can be selected from amino acids, for example. The carboxylic acid nucleating agent can be selected from orotic acid, for example.

[0034] The second anti-hydrolysis agent is selected from one or a combination of monoepoxy glycidyl ester, diepoxy glycidyl ester, epoxy soybean oil, isocyanate glycidyl ester, monomeric carbodiimide, aliphatic carbodiimide and aromatic carbodiimide.

[0035] The second bio-based material is selected from one or more combinations of polylactic acid (PLA), polybutylene terephthalate-adipate (PBAT), polybutylene succinate (PBS), polyhydroxyalkanoate (PHA), polycaprolactone (PCL), and polyglycolic acid (PGA).

[0036] When the bio-based anti-hydrolysis material for bonding is a combination of a second bio-based material, a second bio-based nucleating agent and a second anti-hydrolysis agent, a second antibacterial masterbatch may also be included. The second antibacterial masterbatch may be directly commercially available.

[0037] The advantages of bio-based anti-hydrolysis materials for bonding are that bio-based anti-hydrolysis materials have advantages in performance, practicality, degradability, safety, etc. At the same time, the synthetic raw materials of some biodegradable materials can be obtained by biomass fermentation extraction, reducing the use of fossil energy and conforming to the concept of sustainable development. In particular, the use of PBAT as a bonding material can be biodegradable and well bonded to the fluff pulp, preventing the fluff pulp fibers from falling off, improving the formability of the fiber mesh, and at the same time maintaining good mechanical properties, stiffness, and heat resistance.

[0038] In the composite layer of the present invention, the fluff pulp fibers are obtained by opening paperboard fibers (which can be processed in an existing manner). The paperboard fibers are selected from International Paper Company.

[0039] In the composite layer of the present invention, the fluff pulp fibers account for 40-80% of the weight of the nonwoven fabric, preferably 55-75%. The fluff pulp fibers account for 65-85% of the weight of the composite layer, preferably 75%-80%. The present invention uses biodegradable fluff pulp fibers with good water and oil absorption, and uses melt-blown bio-based materials or other biodegradable polymers and a mixture of two or more of the above polymers to make microfibers, which play a role in fixing and covering the fluff pulp fibers. At the same time, the porous fiber net composed of microfibers will not block the absorption performance of the fluff pulp fibers in the core layer. The surface layer and the bottom layer with micropores and composed entirely of biodegradable microfibers completely cover the middle layer mixed with a large amount of fluff pulp fibers, so that wood pulp cannot fall out from the surface of the nonwoven fabric, thereby effectively preventing debris from falling, and at the same time, bonding can also improve the mechanical strength of the present invention, and can also prevent environmental pollution.

[0040] In a first embodiment:

[0041] The nonwoven fabric comprises a first bio-based hydrolysis-resistant meltblown layer and a composite layer. Figure 2 .

[0042] The material of the first bio-based anti-hydrolysis meltblown layer is selected from the anti-hydrolysis masterbatch processed by granulation and the anti-hydrolysis PLA material obtained by blending and spinning of PLA resin. The anti-hydrolysis masterbatch processed by granulation is prepared by mixing PLA with a third bio-based nucleating agent and a third anti-hydrolysis agent. Among them, the third bio-based nucleating agent can be selected from a combination of one or more of polysaccharide nucleating agents, phenolic nucleating agents, alcohol nucleating agents, protein nucleating agents, and carboxylic acid nucleating agents. Among them, the polysaccharide nucleating agent is selected from a combination of one or more of starch, cellulose, chitin, chitosan and cyclodextrin. Phenolic nucleating agents can be selected from lignin, for example. Alcohol nucleating agents can be selected from inositol, for example. Protein nucleating agents can be selected from amino acids, for example. Carboxylic acid nucleating agents can be selected from orotic acid, for example. The third anti-hydrolysis agent is selected from one or a combination of monoepoxy glycidyl ester, diepoxy glycidyl ester, epoxy soybean oil, isocyanate glycidyl ester, monomeric carbodiimide, aliphatic carbodiimide and aromatic carbodiimide.

[0043] The material of the composite layer is selected from the anti-hydrolysis PLA material obtained by blending and spinning the anti-hydrolysis masterbatch processed by granulation and the PLA resin, and is thermally mixed with the fluff pulp fiber to form a composite structure. The anti-hydrolysis masterbatch processed by granulation is prepared by mixing PLA with a first bio-based nucleating agent and a first anti-hydrolysis agent. The selection of the first bio-based nucleating agent and the first anti-hydrolysis agent is the same as the selection in the aforementioned composite layer of the present invention.

[0044] Furthermore, the fiber fineness of the first bio-based hydrolysis-resistant meltblown layer can be, for example, 1-20 um, 1-2 um, 2-6 um, 6-10 um or 10-20 um, etc. Preferably, it is 2-6 um.

[0045] Furthermore, the fiber fineness of the composite layer may be, for example, 1-20 um, 1-2 um, 2-6 um, 6-10 um or 10-20 um, etc. Preferably, it is 2-6 um.

[0046] Furthermore, the density of the nonwoven fabric is (5-15)%, preferably (7-12)%.

[0047] In the second embodiment:

[0048] The nonwoven fabric comprises a first bio-based hydrolysis-resistant meltblown layer and a composite layer. Figure 2 .

[0049] The material of the first bio-based anti-hydrolysis meltblown layer is selected from the anti-hydrolysis masterbatch processed by granulation and the anti-hydrolysis PBAT material obtained by blending and spinning PBAT resin. Among them, the anti-hydrolysis masterbatch processed by granulation is prepared by mixing PBAT with a third bio-based nucleating agent and a third anti-hydrolysis agent. Among them, the third bio-based nucleating agent and the third anti-hydrolysis agent are selected from the same as the first embodiment.

[0050] The material of the composite layer is selected from the anti-hydrolysis masterbatch processed by granulation and the anti-hydrolysis PBAT material obtained by blending and spinning PBAT resin, and is thermally mixed with fluff pulp fiber to form a composite structure. The anti-hydrolysis masterbatch processed by granulation is obtained by mixing PBAT with a first bio-based nucleating agent and a first anti-hydrolysis agent.

[0051] Furthermore, the fiber fineness of the first bio-based hydrolysis-resistant meltblown layer can be, for example, 1-20 um, 1-2 um, 2-6 um, 6-10 um or 10-20 um, etc. Preferably, it is 2-6 um.

[0052] Furthermore, the fiber fineness of the composite layer may be, for example, 1-20 um, 1-2 um, 2-6 um, 6-10 um or 10-20 um, etc. Preferably, it is 2-6 um.

[0053] The density of the nonwoven fabric is (5-15)%, preferably (7-12)%;

[0054] In the third embodiment:

[0055] The nonwoven fabric also includes a first bio-based anti-hydrolysis meltblown layer and a second bio-based anti-hydrolysis meltblown layer, and the composite layer is arranged between the first bio-based anti-hydrolysis meltblown layer and the second bio-based anti-hydrolysis meltblown layer. Figure 3 .

[0056] The material of the first bio-based anti-hydrolysis meltblown layer is selected from the anti-hydrolysis PLA material obtained by blending and spinning the anti-hydrolysis masterbatch processed by granulation and PLA resin. The anti-hydrolysis masterbatch processed by granulation is prepared by mixing PLA with a third bio-based nucleating agent and a third anti-hydrolysis agent. The selection of the third bio-based nucleating agent and the third anti-hydrolysis agent is the same as that of the first embodiment.

[0057] The material of the second bio-based anti-hydrolysis meltblown layer is selected from the anti-hydrolysis masterbatch processed by granulation and the anti-hydrolysis PBAT material obtained by blending and spinning PBAT resin. Among them, the anti-hydrolysis masterbatch processed by granulation is prepared by mixing PBAT with a fourth bio-based nucleating agent and a fourth anti-hydrolysis agent. Among them, the fourth bio-based nucleating agent can be selected from a combination of one or more of polysaccharide nucleating agents, phenolic nucleating agents, alcohol nucleating agents, protein nucleating agents, and carboxylic acid nucleating agents. Among them, the polysaccharide nucleating agent is selected from a combination of one or more of starch, cellulose, chitin, chitosan and cyclodextrin. Phenolic nucleating agents can be selected from lignin, for example. Alcohol nucleating agents can be selected from inositol, for example. Protein nucleating agents can be selected from amino acids, for example. Carboxylic acid nucleating agents can be selected from orotic acid, for example. The fourth anti-hydrolysis agent is selected from one or a combination of monoepoxy glycidyl ester, diepoxy glycidyl ester, epoxy soybean oil, isocyanate glycidyl ester, monomeric carbodiimide, aliphatic carbodiimide and aromatic carbodiimide.

[0058] The composite layer is selected from the anti-hydrolysis PBAT material obtained by blending and spinning the anti-hydrolysis masterbatch processed by granulation and PBAT resin, and is thermally mixed with fluff pulp fibers to form a composite layer. The anti-hydrolysis masterbatch processed by granulation is prepared by mixing PBAT with a first bio-based nucleating agent and a first anti-hydrolysis agent. The selection of the first bio-based nucleating agent and the first anti-hydrolysis agent is the same as the selection in the aforementioned composite layer of the present invention.

[0059] The fiber fineness of the first bio-based hydrolysis-resistant meltblown layer can be, for example, 1-20 um, 1-2 um, 2-6 um, 6-10 um or 10-20 um, etc. Preferably, it is 2-6 um.

[0060] The fiber fineness of the second bio-based hydrolysis-resistant meltblown layer can be, for example, 1-20 um, 1-2 um, 2-6 um, 6-10 um or 10-20 um, etc. Preferably, it is 2-6 um.

[0061] The fineness of the composite layer meltblown fibers can be, for example, 1-20 um, 1-2 um, 2-6 um, 6-10 um or 10-20 um, etc. Preferably, it is 2-6 um.

[0062] The density of the nonwoven fabric is (5-15)%, preferably (7-12)%.

[0063] In the fourth to sixth embodiments:

[0064] Compared with the third embodiment, the fourth to sixth embodiments further include a first bio-based anti-hydrolysis spunbond layer and a second bio-based anti-hydrolysis spunbond layer, wherein the second bio-based anti-hydrolysis spunbond layer, the second bio-based anti-hydrolysis meltblown layer, the composite layer, the first bio-based anti-hydrolysis meltblown layer, and the first bio-based anti-hydrolysis spunbond layer are stacked in sequence. Figure 4 .

[0065] The first bio-based hydrolysis-resistant spunbond layer and the second bio-based hydrolysis-resistant spunbond layer are respectively made of one or a combination of hydrolysis-resistant PLA spunbond material, hydrolysis-resistant PBAT spunbond material and the like.

[0066] The material of the first bio-based hydrolysis-resistant meltblown layer is selected from the hydrolysis-resistant PLA material obtained by blending and spinning the hydrolysis-resistant masterbatch processed by granulation and the PLA resin.

[0067] The material of the second bio-based hydrolysis-resistant meltblown layer is selected from the hydrolysis-resistant PBAT material obtained by blending and spinning the hydrolysis-resistant masterbatch processed by granulation and the PBAT resin.

[0068] The composite layer is selected from the anti-hydrolysis PBAT material obtained by blending and spinning the anti-hydrolysis masterbatch processed by granulation and PBAT resin, and is thermally mixed with fluff pulp fibers to form a composite structure.

[0069] The fiber fineness of the first bio-based hydrolysis-resistant meltblown layer can be, for example, 1-20 um, 1-2 um, 2-6 um, 6-10 um or 10-20 um, etc. Preferably, it is 2-6 um.

[0070] The fiber fineness of the second bio-based hydrolysis-resistant meltblown layer can be, for example, 1-20 um, 1-2 um, 2-6 um, 6-10 um or 10-20 um, etc. Preferably, it is 2-6 um.

[0071] The fineness of the composite layer meltblown fibers can be, for example, 1-20 um, 1-2 um, 2-6 um, 6-10 um or 10-20 um, etc. Preferably, it is 2-6 um.

[0072] The first bio-based anti-hydrolysis spunbond layer and the second bio-based anti-hydrolysis spunbond layer have a gram weight of 5-20 gsm, preferably 8-15 gsm, and a fiber fineness of 10-30 um, preferably 15-25 um. The gram weight and fiber fineness of the first bio-based anti-hydrolysis spunbond layer and the second bio-based anti-hydrolysis spunbond layer can be the same or different. The first bio-based anti-hydrolysis spunbond layer and the second bio-based anti-hydrolysis spunbond layer can assist in supporting the surface, thereby improving the uniformity of the mesh surface.

[0073] The density of the nonwoven fabric is (5-15)%, preferably (7-12)%;

[0074] In an embodiment of the present invention, the first bio-based material, the second bio-based material, and the third bio-based material may be the same or different. The first bio-based nucleating agent, the second bio-based nucleating agent, and the third bio-based nucleating agent may be the same or different. The first anti-hydrolysis agent, the second anti-hydrolysis agent, and the third anti-hydrolysis agent may be the same or different.

[0075] In the embodiment of the present invention, the fiber fineness of the first bio-based hydrolysis resistant meltblown layer, the composite layer, and the second bio-based hydrolysis resistant meltblown layer may be the same or different.

[0076] In the embodiment of the present invention, adjacent layers are tightly combined by ultrasonic wave, hot rolling, glue or the like.

[0077] Preparation method of ultra-fine bio-based hydrolysis-resistant nonwoven fabric for wiping

[0078] The preparation method at least comprises the steps of crushing the fluff pulp paperboard by open feeding, and the obtained fluff pulp fibers are rapidly cut into the bio-based anti-hydrolysis layer by air flow to be thermally mixed, thereby forming a composite layer to provide a nonwoven fabric.

[0079] More specifically, the preparation of the composite layer: The fluff pulp board is crushed and broken down into single fibers, and then transported to the meltblowing area through pipelines. Under the action of high-speed airflow (greater than 340m / s), the fluff pulp fibers quickly cut into the bio-based anti-hydrolysis layer to form a fluff pulp composite layer.

[0080] More specifically, The preparation method comprises at least the following steps:

[0081] 1) The bio-based material, the nucleating agent and the anti-hydrolysis agent are uniformly mixed to prepare the anti-hydrolysis masterbatch;

[0082] 2) The bio-based material and the anti-hydrolysis masterbatch in step 1) are processed by a melt-blown die head and oriented by airflow stretching, and then randomly and evenly spread on a forming mesh curtain under the action of a suction fan to obtain a first bio-based anti-hydrolysis material, i.e., a first bio-based anti-hydrolysis melt-blown layer;

[0083] 3) The bio-based material and the anti-hydrolysis masterbatch in step 1) are processed by a melt-blowing die head and oriented by air flow drawing, and then thermally mixed with the fluff pulp fiber 1 to form a composite layer;

[0084] 4) The first bio-based hydrolysis-resistant meltblown layer and the composite layer form a layered fabric on the conveying curtain 7, and then are bonded into a nonwoven fabric with a sheet material by mechanical, thermal, chemical, and ultrasonic methods;

[0085] 5) The bio-based anti-hydrolysis material is not limited to the above-mentioned preparation method, and can be a combination of multiple anti-hydrolysis materials.

[0086] Furthermore, in step 1), an antibacterial masterbatch can be optionally added and mixed with a bio-based material, a nucleating agent, and an anti-hydrolysis agent. It should be noted that, for example, the anti-hydrolysis masterbatch used in the composite layer is obtained by uniformly mixing the third bio-based material, the first nucleating agent, and the first anti-hydrolysis agent to obtain the anti-hydrolysis masterbatch. If it is an anti-hydrolysis masterbatch used in the first bio-based anti-hydrolysis melt-blown layer, PLA or PBAT is uniformly mixed with the third nucleating agent and the third anti-hydrolysis agent to obtain the anti-hydrolysis masterbatch. For another example, the anti-hydrolysis masterbatch used in the second bio-based anti-hydrolysis melt-blown layer is PLA or PBAT, which is uniformly mixed with the fourth nucleating agent and the fourth anti-hydrolysis agent to obtain the anti-hydrolysis masterbatch.

[0087] The moisture content of the anti-hydrolysis masterbatch provided in step 1) of the present invention is 500ppm, preferably 300ppm, more preferably 200ppm, and most preferably 100ppm. The anti-hydrolysis masterbatch drying method can adopt the currently known drying methods, which can include vacuum rotary drying, drying tower drying, oven drying, etc. The vacuum rotary drying preferably has a drying temperature of 50-85°C, a vacuum degree of 0.05-0.1Mpa, and a drying time of ≥8h; the drying tower drying temperature is preferably 40-80°C, the dry air dew point is ≤-30°C, and the drying time is ≥8h; according to the type of polymer selected and the initial moisture content of the polymer, relevant technical personnel in this field know how to adjust the drying process conditions.

[0088] The method for preparing the ultra-fine bio-based hydrolysis-resistant wiping nonwoven fabric of the present invention further comprises step 6):

[0089] 6) The bio-based material and the anti-hydrolysis masterbatch in step 1) are processed by a melt-blown die head and oriented by air flow stretching, and then randomly and evenly spread on a forming mesh curtain under the action of a suction fan to obtain a second bio-based anti-hydrolysis material, i.e., a second bio-based anti-hydrolysis melt-blown layer.

[0090] The method for preparing the ultra-fine bio-based hydrolysis-resistant wiping nonwoven fabric of the present invention further comprises step 7):

[0091] The nonwoven fabric having sheet-like material is bonded by mechanical, thermal, chemical or ultrasonic means to the first bio-based anti-hydrolysis meltblown layer or the second bio-based anti-hydrolysis meltblown layer and the first bio-based anti-hydrolysis spunbond layer and / or the second bio-based anti-hydrolysis spunbond layer.

[0092] application

[0093] At present, a large number of non-woven materials are used in the fields of wiping and hygiene, and most of them are disposable products. They are made of wood pulp and adhesives, or wood pulp and non-degradable fibers. There are two major problems with existing products. One is that the materials contain ingredients that are harmful to the environment, and some adhesives can also cause harm to human skin. The second is "chipping". The length of wood pulp fibers is only a few millimeters. The structure of existing products is not enough to fix the wood pulp fibers and cover the surface, which will cause "chipping" and bring many inconveniences to use. Increasing the amount of adhesive or bonding and coating fibers will increase the adverse effects on the environment. The present invention uses a bio-based anti-hydrolysis material for bonding, such as PBAT with high viscosity, to bond wood pulp, which can effectively solve the problem of chipping and has good coating performance.

[0094] Compared with the prior art, the ultra-fine bio-based hydrolysis-resistant wiping nonwoven fabric of the present invention has the following beneficial effects:

[0095] The ultra-fine bio-based hydrolysis-resistant wiping nonwoven fabric of the present application embeds fluff pulp fibers into a bio-based hydrolysis-resistant layer and relies on the self-adhesion of the fluff pulp fibers and the bio-based hydrolysis-resistant layer to prevent the fibers and particles from falling off. In addition, the design of the mixed fluff pulp fibers and the tortuous pore structure enable the material to absorb water and contain more water, thereby improving the water absorption and water content of the material. In a further preferred embodiment, the hydrolysis-resistant formula of the present application is optimized.

[0096] The present application also provides a method for preparing ultra-fine bio-based hydrolysis-resistant wiping nonwoven fabric, and proposes to use a melt-blown hot-mixing process to process bio-based ultra-fine fibers and fluff pulp fiber composite wiping materials. In addition, the bio-based melt-blown materials are not resistant to hydrolysis and have a short shelf life, and the anti-hydrolysis problem of the hot-mixed nonwoven fabric is improved, and the shelf life of the wiping material is extended, thereby solving the problems in the prior art. Specifically, the new nonwoven fabric processing technology of the present application has an energy consumption of 1300kWh / ton, which can significantly reduce energy consumption. Compared with traditional spunlace nonwoven fabrics, the energy consumption per ton of material is reduced by 50%, and waterless processing can save 200 tons of water per day. The fiber fineness is 1 / 8 of the spunlace fiber fineness, and the cloth surface is more delicate. The anti-hydrolysis formula treatment can extend the shelf life of the material to 2 years when immersed in pure water.

[0097] The beneficial effects of the present invention are further illustrated below in conjunction with embodiments.

[0098] In order to make the invention purpose, technical scheme and beneficial technical effect of the present invention clearer, the present invention is further described in detail below in conjunction with examples. However, it should be understood that the examples of the present invention are only for explaining the present invention, not for limiting the present invention, and the examples of the present invention are not limited to the examples given in the specification. The specific experimental conditions or operating conditions not specified in the examples are made under conventional conditions, or are made under the conditions recommended by the material supplier.

[0099] In addition, it should be understood that one or more method steps mentioned in the present invention do not exclude the existence of other method steps before or after the combination step or the insertion of other method steps between these explicitly mentioned steps, unless otherwise specified; it should also be understood that the combination connection relationship between one or more devices / apparatuses mentioned in the present invention does not exclude the existence of other devices / apparatuses before or after the combination device / apparatus or the insertion of other devices / apparatuses between these explicitly mentioned two devices / apparatuses, unless otherwise specified. Moreover, unless otherwise specified, the numbering of each method step is only a convenient tool for identifying each method step, and is not intended to limit the order of arrangement of each method step or the scope of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the present invention without substantially changing the technical content.

[0100] In the following examples, the reagents, materials and instruments used are all commercially available unless otherwise specified.

[0101] Example 1

[0102] like Figure 1 , fluff pulp 1, hydrolysis-resistant PLA meltblown 2, hydrolysis-resistant PLA meltblown 3, multilayer structure 8. The fluff pulp was selected from North American Paper, the PLA material was purchased from Naturalworks 6252D, the hydrolysis-resistant masterbatch was prepared by granulation, and the bio-based nucleating agent and anti-hydrolysis agent for granulation were selected from Shanxi Chemical Research Institute TMC-328 and Changchun Chemical Epoxidized Soybean Oil B-22, respectively, with a ratio of 7:3.

[0103] Preparation of the first bio-based anti-hydrolysis meltblown layer: PLA, bio-based nucleating agent and anti-hydrolysis agent are mixed in a ratio of 85:5:10 to obtain an anti-hydrolysis masterbatch. The anti-hydrolysis masterbatch (added at a ratio of 2% of the first bio-based anti-hydrolysis meltblown layer) and PLA bio-based resin (added at a ratio of 98% of the first bio-based anti-hydrolysis meltblown layer) are transported to the screw extruder by airflow, heated to a suitable melt temperature, and then transported to the meltblown die head by a metering pump, and stretched and thinned by supersonic hot air flow to form a PLA anti-hydrolysis meltblown material layer. The fiber fineness of the prepared first bio-based anti-hydrolysis meltblown layer is 2.0um.

[0104] Composite layer: PLA, bio-based nucleating agent and anti-hydrolysis agent are mixed evenly in a mass ratio of 85:5:10 to obtain anti-hydrolysis masterbatch. Fluff pulp paperboard is crushed by open feeding, decomposed into single fiber state, and transported to the melt-blown die head through a pipeline. Fluff pulp fibers accounting for 65% of the composite layer mass ratio are rapidly cut into the bonding bio-based anti-hydrolysis material accounting for 35% of the composite layer mass ratio under the action of high-speed airflow. The bonding bio-based anti-hydrolysis material includes PLA accounting for 90% of its mass ratio and anti-hydrolysis masterbatch accounting for 10% of its mass ratio as raw materials. Fluff pulp and bonding bio-based anti-hydrolysis material are melt-blown to form a composite layer. The fiber fineness of the composite layer is 2.6um.

[0105] The first bio-based hydrolysis-resistant meltblown layer and the composite layer form a layered fabric on the conveying curtain 7, and then are bonded by ultrasonic means to form a nonwoven fabric having a sheet material, such as Figure 2 The nonwoven fabric has a solidity of 7.3%.

[0106] Example 2

[0107] like Figure 1 , fluff pulp 1, hydrolysis-resistant PBAT meltblown 2, hydrolysis-resistant PBAT meltblown 3, multilayer structure 8, wherein the fluff pulp is selected from International Paper Company, PBAT is selected from Huafeng, the hydrolysis-resistant masterbatch is prepared by granulation, and the nucleating agent and hydrolysis-resistant agent for granulation are selected from Shanxi Chemical Research Institute TMC-328 and Changchun Chemical epoxidized soybean oil B-22, and the ratio of the two is 7:3.

[0108] Preparation of the first bio-based anti-hydrolysis meltblown layer: PBAT is mixed with a bio-based nucleating agent and an anti-hydrolysis agent in a ratio of 75:5:20 to obtain an anti-hydrolysis masterbatch. The anti-hydrolysis masterbatch (added at a ratio of 2% of the first bio-based anti-hydrolysis meltblown layer) and the PBAT bio-based resin (added at a ratio of 98% of the first bio-based anti-hydrolysis meltblown layer) are transported to the screw extruder by airflow, heated to a suitable melt temperature, and then transported to the meltblown die head by a metering pump, and stretched and thinned by supersonic hot air flow to form a PBAT anti-hydrolysis meltblown material layer. The fiber fineness of the prepared first bio-based anti-hydrolysis meltblown layer is 2.2um.

[0109] Composite layer: PBAT is mixed with bio-based nucleating agent and anti-hydrolysis agent in a ratio of 75:5:20 to obtain bio-based anti-hydrolysis masterbatch. Fluff pulp paperboard is crushed by open feeding, decomposed into single fiber state, and transported to the melt-blown die head through a pipeline. Fluff pulp fibers accounting for 65% of the composite layer by mass are rapidly cut into the bonding bio-based anti-hydrolysis material accounting for 35% of the composite layer by mass under the action of high-speed airflow. The bonding bio-based anti-hydrolysis material includes PLA accounting for 85% of its mass ratio and anti-hydrolysis masterbatch accounting for 15% of its mass ratio as raw materials. Fluff pulp and bonding bio-based anti-hydrolysis material are melt-blown to form a composite layer. The fiber fineness of the composite layer is 2.2um.

[0110] The first bio-based hydrolysis-resistant meltblown layer and the composite layer form a layered fabric on the conveying curtain 7, and then are bonded by ultrasonic means to form a nonwoven fabric having a sheet material, such as Figure 2 The nonwoven fabric has a solidity of 7.8%.

[0111] Example 3

[0112] Fluff pulp 1, hydrolysis-resistant PLA meltblown 2, hydrolysis-resistant PBAT meltblown 3, hydrolysis-resistant PBAT meltblown 4, multilayer structure 8, see Figure 3 The fluff pulp was selected from International Paper Company, the PLA material was purchased from Naturalworks 6252D, the PBAT was selected from Huafeng, the anti-hydrolysis masterbatch was prepared by granulation, and the nucleating agent and anti-hydrolysis agent for granulation were selected from Qingdao Sino KY-EBS and Changchun Chemical epoxidized soybean oil B-22, and the ratio of the two was 5:5.

[0113] Preparation of the first bio-based anti-hydrolysis meltblown layer: PLA, bio-based nucleating agent and anti-hydrolysis agent are mixed in a ratio of 75:5:20 to obtain an anti-hydrolysis masterbatch. The anti-hydrolysis masterbatch (added at a ratio of 2% of the first bio-based anti-hydrolysis meltblown layer) and PLA bio-based resin (added at a ratio of 98% of the first bio-based anti-hydrolysis meltblown layer) are transported to the screw extruder by airflow, heated to a suitable melt temperature, and then transported to the meltblown die head by a metering pump, and stretched and thinned by supersonic hot air flow to form a PLA anti-hydrolysis meltblown material layer, i.e., the first bio-based anti-hydrolysis meltblown layer. The fiber fineness of the prepared first bio-based anti-hydrolysis meltblown layer is 3.2um.

[0114] Preparation of the second bio-based anti-hydrolysis meltblown layer: PBAT is mixed with a bio-based nucleating agent and an anti-hydrolysis agent in a ratio of 75:5:20 to obtain an anti-hydrolysis masterbatch. The anti-hydrolysis masterbatch (added at a ratio of 3% of the second bio-based anti-hydrolysis meltblown layer) and the PBAT bio-based resin (added at a ratio of 97% of the second bio-based anti-hydrolysis meltblown layer) are transported to the screw extruder by airflow, heated to a suitable melt temperature, and then transported to the meltblown die head by a metering pump, and stretched and thinned by supersonic hot air flow to form a PBAT anti-hydrolysis meltblown material layer, i.e., the second bio-based anti-hydrolysis meltblown layer. The fiber fineness of the prepared second bio-based anti-hydrolysis meltblown layer is 2.1um.

[0115] Composite layer: PBAT is mixed with a bio-based nucleating agent and an anti-hydrolysis agent in a ratio of 75:5:20 to obtain a bio-based anti-hydrolysis masterbatch. The fluff pulp paperboard is crushed by opening and decomposed into a single fiber state, and transported to the melt-blown die head through a pipeline. The fluff pulp fiber, which accounts for 65% of the composite layer by mass, is rapidly cut into the bonding bio-based anti-hydrolysis material, which accounts for 35% of the composite layer by mass, under the action of high-speed airflow. The bonding bio-based anti-hydrolysis material includes PBAT, which accounts for 85% of its mass ratio, and anti-hydrolysis masterbatch, which accounts for 15% of its mass ratio, as raw materials. The fluff pulp and the bonding bio-based anti-hydrolysis material are melt-blown to form a composite layer. The fiber fineness of the composite layer is 2.5um.

[0116] The first bio-based anti-hydrolysis meltblown layer, the second bio-based anti-hydrolysis meltblown layer and the composite layer form a layered fabric on the conveying curtain 7, and then are bonded by hot rolling to form a non-woven fabric with a sheet material, such as Figure 3 The nonwoven fabric has a solidity of 9.0%.

[0117] Example 4

[0118] like Figure 1 , spunbond PBAT5, fluff pulp 1, hydrolysis-resistant PLA meltblown 2, hydrolysis-resistant PBAT meltblown 3, hydrolysis-resistant PBAT meltblown 4, spunbond PBAT6, multilayer structure 8. Among them, spunbond PBAT5 is a spunbond nonwoven fabric produced by Jingfa (model: F581), fluff pulp 1 is selected from International Paper Company, PLA material is purchased from Naturalworks 6252D, PBAT is selected from Huafeng, and the hydrolysis-resistant masterbatch is prepared by granulation. The nucleating agent and anti-hydrolysis agent for granulation are selected from Qingdao Sino KY-EBS and Changchun Chemical Epoxidized Soybean Oil B-22, with a ratio of 8:2.

[0119] Preparation of the first bio-based anti-hydrolysis meltblown layer: PLA, bio-based nucleating agent and anti-hydrolysis agent are mixed in a ratio of 75:5:20 to obtain an anti-hydrolysis masterbatch. The anti-hydrolysis masterbatch (added at a ratio of 2% of the first bio-based anti-hydrolysis meltblown layer) and PLA bio-based resin (added at a ratio of 98% of the first bio-based anti-hydrolysis meltblown layer) are transported to the screw extruder by airflow, heated to a suitable melt temperature, and then transported to the meltblown die head by a metering pump, and stretched and thinned by supersonic hot air flow to form a PLA anti-hydrolysis meltblown material layer, i.e., the first bio-based anti-hydrolysis meltblown layer. The fiber fineness of the prepared first bio-based anti-hydrolysis meltblown layer is 2.8um.

[0120] Preparation of the second bio-based anti-hydrolysis meltblown layer: PBAT is mixed with a bio-based nucleating agent and an anti-hydrolysis agent in a ratio of 75:5:20 to obtain an anti-hydrolysis masterbatch. The anti-hydrolysis masterbatch (added at a ratio of 3% of the second bio-based anti-hydrolysis meltblown layer) and the PBAT bio-based resin (added at a ratio of 97% of the second bio-based anti-hydrolysis meltblown layer) are transported to the screw extruder by airflow, heated to a suitable melt temperature, and then conveyed to the meltblown die head by a metering pump, and stretched and thinned by a supersonic hot air flow to form a PBAT anti-hydrolysis meltblown material layer, i.e., the second bio-based anti-hydrolysis meltblown layer. The fiber fineness of the prepared second bio-based anti-hydrolysis meltblown layer is 2.8um.

[0121] Composite layer: PBAT is mixed with a bio-based nucleating agent and an anti-hydrolysis agent in a ratio of 75:5:20 to obtain a bio-based anti-hydrolysis masterbatch. The fluff pulp paperboard is crushed by opening and decomposed into a single fiber state, and transported to the melt-blown die head through a pipeline. The fluff pulp fiber, which accounts for 65% of the composite layer by mass, is rapidly cut into the bonding bio-based anti-hydrolysis material, which accounts for 35% of the composite layer by mass, under the action of high-speed airflow. The bonding bio-based anti-hydrolysis material includes PBAT, which accounts for 85% of its mass ratio, and anti-hydrolysis masterbatch, which accounts for 15% of its mass ratio, as raw materials. The fluff pulp and the bonding bio-based anti-hydrolysis material are melt-blown to form a composite layer. The fiber fineness of the composite layer is 2.5um.

[0122] The first bio-based anti-hydrolysis spunbond layer: the 20gsm anti-hydrolysis PBAT spunbond material with model F581 produced by Shanghai Jingfa Industrial Co., Ltd. is selected; it is combined with the first bio-based anti-hydrolysis meltblown layer by hot rolling.

[0123] The second bio-based anti-hydrolysis spunbond layer: The 20gsm anti-hydrolysis PBAT spunbond material with model F581 produced by Shanghai Jingfa Industrial Co., Ltd. is selected; it is combined with the second bio-based anti-hydrolysis meltblown layer by hot rolling.

[0124] The first bio-based anti-hydrolysis meltblown layer, the second bio-based anti-hydrolysis meltblown layer and the composite layer, the first bio-based anti-hydrolysis spunbond layer, and the second bio-based anti-hydrolysis spunbond layer form a layered fabric on the conveying curtain 7, and then are bonded by hot rolling to form a nonwoven fabric having a sheet material, such as Figure 4 The nonwoven fabric has a solidity of 9.2%.

[0125] Example 5

[0126] Spunbond PLA5, fluff pulp 1, hydrolysis-resistant PLA meltblown 2, hydrolysis-resistant PBAT meltblown 3, hydrolysis-resistant PBAT meltblown 4, spunbond PLA6, multilayer structure 8, wherein spunbond PLA5 is a spunbond nonwoven fabric produced by Jingfa, fluff pulp 1 is selected from International Paper Company, PLA material is purchased from Naturalworks 6252D, PBAT is selected from Huafeng, spunbond PLA6 is a spunbond nonwoven fabric produced by Jingfa, the hydrolysis-resistant masterbatch is prepared by granulation, and the nucleating agent and anti-hydrolysis agent for granulation are selected from Qingdao Sino KY-EBS and Changchun Chemical Epoxidized Soybean Oil B-22, and the ratio between the two is 8:2.

[0127] Preparation of the first bio-based anti-hydrolysis meltblown layer: PLA, bio-based nucleating agent and anti-hydrolysis agent are mixed in a ratio of 75:5:20 to obtain an anti-hydrolysis masterbatch. The anti-hydrolysis masterbatch (added at a ratio of 2% of the first bio-based anti-hydrolysis meltblown layer) and PLA bio-based resin (added at a ratio of 98% of the first bio-based anti-hydrolysis meltblown layer) are transported to the screw extruder by airflow, heated to a suitable melt temperature, and then transported to the meltblown die head by a metering pump, and stretched and thinned by supersonic hot air flow to form a PLA anti-hydrolysis meltblown material layer, i.e., the first bio-based anti-hydrolysis meltblown layer. The fiber fineness of the prepared first bio-based anti-hydrolysis meltblown layer is 2.3um.

[0128] Preparation of the second bio-based anti-hydrolysis meltblown layer: PBAT is mixed with a bio-based nucleating agent and an anti-hydrolysis agent in a ratio of 75:5:20 to obtain an anti-hydrolysis masterbatch. The anti-hydrolysis masterbatch (added at a ratio of 3% of the second bio-based anti-hydrolysis meltblown layer) and the PBAT bio-based resin (added at a ratio of 97% of the second bio-based anti-hydrolysis meltblown layer) are transported to the screw extruder by airflow, heated to a suitable melt temperature, and then conveyed to the meltblown die head by a metering pump, and stretched and thinned by a supersonic hot air flow to form a PBAT anti-hydrolysis meltblown material layer, i.e., the second bio-based anti-hydrolysis meltblown layer. The fiber fineness of the prepared second bio-based anti-hydrolysis meltblown layer is 2.5um.

[0129] Composite layer: PBAT is mixed with a bio-based nucleating agent and an anti-hydrolysis agent in a ratio of 75:5:20 to obtain a bio-based anti-hydrolysis masterbatch. The fluff pulp paperboard is crushed by opening and decomposed into a single fiber state, and transported to the melt-blown die head through a pipeline. The fluff pulp fiber, which accounts for 65% of the mass ratio of the composite layer, is rapidly cut into the bonding bio-based anti-hydrolysis material, which accounts for 35% of the mass ratio of the composite layer, under the action of high-speed airflow. The bonding bio-based anti-hydrolysis material includes 85% PBAT and 15% anti-hydrolysis masterbatch as raw materials. The fluff pulp and the bonding bio-based anti-hydrolysis material are melt-blown to form a composite layer. The fiber fineness of the composite layer is 2.3um.

[0130] The first bio-based hydrolysis-resistant spunbond layer: 15gsm hydrolysis-resistant PLA spunbond material produced by Shanghai Jingfa Industrial Co., Ltd. (Model 8133)

[0131] The second bio-based hydrolysis-resistant spunbond layer: 15gsm hydrolysis-resistant PLA spunbond material produced by Shanghai Jingfa Industrial Co., Ltd. (model 8133)

[0132] The first bio-based anti-hydrolysis meltblown layer, the second bio-based anti-hydrolysis meltblown layer and the composite layer, the first bio-based anti-hydrolysis spunbond layer, and the second bio-based anti-hydrolysis spunbond layer form a layered fabric on the conveying curtain 7, and then are bonded by hot rolling to form a nonwoven fabric having a sheet material, such as Figure 4 The density of the nonwoven fabric is 10.1%.

[0133] Example 6

[0134] Spunbond PBAT5, fluff pulp 1, hydrolysis-resistant PLA meltblown 2, hydrolysis-resistant PBAT meltblown 3, hydrolysis-resistant PBAT meltblown 4, spunbond PLA6, multilayer structure 8, wherein spunbond PBAT5 is a spunbond nonwoven fabric produced by Jingfa, fluff pulp 1 is selected from International Paper Company, PLA material is purchased from Naturalworks 6252D, PBAT is selected from Huafeng, spunbond PLA6 is a spunbond nonwoven fabric produced by Jingfa, the hydrolysis-resistant masterbatch is prepared by granulation, and the nucleating agent and anti-hydrolysis agent for granulation are selected from Qingdao Sino KY-EBS and Changchun Chemical epoxidized soybean oil B-22, and the ratio between the two is 8:2.

[0135] Preparation of the first bio-based anti-hydrolysis meltblown layer: PLA, bio-based nucleating agent and anti-hydrolysis agent are mixed evenly in a ratio of 75:5:20 to obtain an anti-hydrolysis masterbatch. The anti-hydrolysis masterbatch (added at a ratio of 2% of the first bio-based anti-hydrolysis meltblown layer) and PLA bio-based resin (added at a ratio of 98% of the first bio-based anti-hydrolysis meltblown layer) are transported to the screw extruder by airflow, heated to a suitable melt temperature, and then transported to the meltblown die head by a metering pump, and stretched and thinned by supersonic hot air flow to form a PLA anti-hydrolysis meltblown material layer, i.e., the first bio-based anti-hydrolysis meltblown layer. The fiber fineness of the prepared first bio-based anti-hydrolysis meltblown layer is 3.5um.

[0136] Preparation of the second bio-based anti-hydrolysis meltblown layer: PBAT is mixed with a bio-based nucleating agent and an anti-hydrolysis agent in a ratio of 75:5:20 to obtain an anti-hydrolysis masterbatch. The anti-hydrolysis masterbatch (added at a ratio of 3% of the second bio-based anti-hydrolysis meltblown layer) and the PBAT bio-based resin (added at a ratio of 97% of the second bio-based anti-hydrolysis meltblown layer) are transported to the screw extruder by airflow, heated to a suitable melt temperature, and then conveyed to the meltblown die head by a metering pump, and stretched and thinned by a supersonic hot air flow to form a PBAT anti-hydrolysis meltblown material layer, i.e., the second bio-based anti-hydrolysis meltblown layer. The fiber fineness of the prepared second bio-based anti-hydrolysis meltblown layer is 2.5um.

[0137] Composite layer: PBAT is mixed with a bio-based nucleating agent and an anti-hydrolysis agent in a ratio of 75:5:20 to obtain a bio-based anti-hydrolysis masterbatch. The fluff pulp paperboard is crushed by opening and decomposed into a single fiber state, and transported to the melt-blown die head through a pipeline. The fluff pulp fiber, which accounts for 65% of the composite layer by mass, is rapidly cut into the bonding bio-based anti-hydrolysis material, which accounts for 35% of the composite layer by mass, under the action of high-speed airflow. The bonding bio-based anti-hydrolysis material includes PBAT, which accounts for 85% of its mass ratio, and anti-hydrolysis masterbatch, which accounts for 15% of its mass ratio, as raw materials. The fluff pulp and the bonding bio-based anti-hydrolysis material are melt-blown to form a composite layer. The fiber fineness of the composite layer is 2.5um.

[0138] The first bio-based anti-hydrolysis spunbond layer: the 20gsm anti-hydrolysis PBAT spunbond material with model F581 produced by Shanghai Jingfa Industrial Co., Ltd. is selected; it is combined with the first bio-based anti-hydrolysis meltblown layer by hot rolling.

[0139] The second bio-based hydrolysis-resistant spunbond layer: 15gsm hydrolysis-resistant PLA spunbond material produced by Shanghai Jingfa Industrial Co., Ltd. (model 8133)

[0140] The first bio-based anti-hydrolysis meltblown layer, the second bio-based anti-hydrolysis meltblown layer and the composite layer, the first bio-based anti-hydrolysis spunbond layer, and the second bio-based anti-hydrolysis spunbond layer form a layered fabric on the conveying curtain 7, and then are bonded by hot rolling to form a nonwoven fabric having a sheet material, such as Figure 4 The nonwoven fabric has a solidity of 9.7%.

[0141] Comparative Example

[0142] Referring to Example 1, the specific implementation is as follows Figure 1 , fluff pulp 1, PLA meltblown 2, PLA meltblown 3, multilayer structure 8. The fluff pulp was selected from North American Paper, and the PLA material was purchased from Naturalworks 6252D.

[0143] Preparation of the first bio-based meltblown layer: Pure PLA resin is conveyed to a screw extruder through an airflow, heated to a suitable melt temperature, and then conveyed to a meltblown die head through a metering pump, where it is stretched and thinned by a supersonic hot airflow to form a PLA meltblown material layer. The fiber fineness of the prepared first bio-based meltblown layer is 2.0 um.

[0144] Composite layer: Fluff pulp paperboard is crushed and broken into single fibers through open feeding, and then transported to the melt-blown die head through a pipeline. Fluff pulp fibers accounting for 65% of the composite layer by mass are rapidly cut into the adhesive bio-based material accounting for 35% of the composite layer by mass under the action of high-speed airflow. Fluff pulp and adhesive bio-based material are melt-blown to form a composite layer. The fiber fineness of the composite layer is 2.6um.

[0145] The first bio-based meltblown layer and the composite layer form a layered fabric on the conveying curtain 7, and then are bonded into a non-woven fabric having a sheet-like material by ultrasonic bonding. The density of the non-woven fabric is 6.9%.

[0146] Table 1

[0147]

[0148]

[0149] Test Method

[0150] The gram weight test standard is tested in accordance with GB / T24218.1

[0151] Thickness GB / T24218.2 Test pressure 125cN, presser foot area 2500mm 2 ;

[0152] Density σ=BW / (ρ*α)

[0153] Where: BW is the weight per unit area, in gsm, ρ is the material density, in g / cc, and α is the material thickness, in mm.

[0154] Strength is in accordance with ASTM D5035, clamp distance 75mm, tensile rate 300mm / min.

[0155] 180-day biodegradation rate and 180-day relative biodegradation rate: Determination of the final aerobic biodegradability of materials under composting conditions, using the method of measuring the released carbon dioxide, test method: GB / T 19277.1-2011.

[0156] 28-day accelerated aging test method: temperature is 54°C, relative humidity is 75%, the sample is immersed in pure water or deionized water until it is completely soaked, and the strength value is tested after 28 days of accelerated aging in the oven. The strength is divided into longitudinal and transverse directions, and the test is in accordance with ASTMD5035.

[0157] After 28 days of accelerated aging, the MD strength value retention rate is above 90%, and the CD strength value is maintained at above 80%, which is equivalent to a 2-year shelf life under natural conditions.

[0158] Energy consumption test method: Use a smart meter to calculate the power load value and divide it by the tons produced to get the standard energy consumption (in kWh / ton).

[0159] In summary, the present invention effectively overcomes various shortcomings of the prior art and has high industrial utilization value.

[0160] The above is only a preferred embodiment of the present invention, and is not any formal or substantial limitation of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and supplements without departing from the method of the present invention, and these improvements and supplements should also be regarded as the protection scope of the present invention. Any technician familiar with this profession, without departing from the spirit and scope of the present invention, can make some changes, modifications and evolutions of the technical content disclosed above, which are equivalent embodiments of the present invention; at the same time, any changes, modifications and evolutions of any equivalent changes made to the above embodiments based on the essential technology of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An ultra-fine bio-based hydrolysis-resistant nonwoven fabric for wiping, characterized in that: The nonwoven fabric at least comprises a composite layer, wherein the composite layer comprises a bio-based anti-hydrolysis layer, wherein fluff pulp fibers are embedded in the bio-based anti-hydrolysis layer, and the fluff pulp fibers are self-adhered to the bio-based anti-hydrolysis layer.

2. The ultra-fine bio-based hydrolysis-resistant wiping nonwoven fabric according to claim 1, characterized in that: The material of the bio-based anti-hydrolysis layer is selected from a bio-based anti-hydrolysis material for bonding, wherein the bio-based anti-hydrolysis material for bonding is selected from a combination of a first bio-based material and an anti-hydrolysis masterbatch, or a combination of a second bio-based material, a second bio-based nucleating agent and a second anti-hydrolysis agent.

3. The ultra-fine bio-based hydrolysis-resistant nonwoven fabric for wiping as claimed in claim 2, characterized in that: When the bonding bio-based anti-hydrolysis material is selected from a combination of a first bio-based material and an anti-hydrolysis masterbatch, the first bio-based material is selected from a combination of one or more of polylactic acid, polybutylene terephthalate-adipate, polybutylene succinate, polyhydroxyalkanoate, polycaprolactone, and polyglycolic acid; the anti-hydrolysis masterbatch includes a third bio-based material, a first bio-based nucleating agent, and a first anti-hydrolysis agent, and the third bio-based material, the first bio-based nucleating agent, and the first anti-hydrolysis agent are prepared into a bio-based anti-hydrolysis masterbatch through blending and compounding.

4. The ultra-fine bio-based hydrolysis-resistant wiping nonwoven fabric according to claim 3, characterized in that: The first anti-hydrolysis agent accounts for 0.5% to 2% of the total weight of the bio-based anti-hydrolysis material for bonding; and / or, the first bio-based nucleating agent accounts for 0.05% to 1% of the total weight of the bio-based hydrolysis-resistant material for bonding; And / or, the anti-hydrolysis masterbatch further comprises a first antibacterial masterbatch, and the weight percentage of the first antibacterial masterbatch in the anti-hydrolysis masterbatch is 1% to 10%; and / or, the weight percentage of the anti-hydrolysis masterbatch in the bio-based anti-hydrolysis material for bonding is 5 to 50%; And / or, the first bio-based nucleating agent is selected from a combination of one or more of polysaccharide nucleating agents, phenolic nucleating agents, alcohol nucleating agents, protein nucleating agents, and carboxylic acid nucleating agents; And / or, the first anti-hydrolysis agent is selected from one or a combination of monoepoxy glycidyl ester, diepoxy glycidyl ester, epoxy soybean oil, isocyanate glycidyl ester, monomeric carbodiimide, aliphatic carbodiimide and aromatic carbodiimide; And / or, the third bio-based material is selected from one or more combinations of polylactic acid, polybutylene terephthalate-adipate, polybutylene succinate, polyhydroxyalkanoate, polycaprolactone, and polyglycolic acid.

5. The ultra-fine bio-based hydrolysis-resistant nonwoven fabric for wiping as claimed in claim 2, characterized in that: When the bio-based anti-hydrolysis material for bonding is a combination of a second bio-based material, a second bio-based nucleating agent and a second anti-hydrolysis agent, the weight percentage of the second bio-based material in the bio-based anti-hydrolysis material for bonding is 97% to 99%; and / or, the weight percentage of the second bio-based nucleating agent in the bio-based anti-hydrolysis material for bonding is 0.05% to 1%; and / or, the weight percentage of the second anti-hydrolysis agent in the bio-based anti-hydrolysis material for bonding is 0.5% to 2%; And / or, the second bio-based nucleating agent is selected from a combination of one or more of polysaccharide nucleating agents, phenolic nucleating agents, alcohol nucleating agents, protein nucleating agents, and carboxylic acid nucleating agents; And / or, the second anti-hydrolysis agent is selected from one or a combination of monoepoxy glycidyl ester, diepoxy glycidyl ester, epoxy soybean oil, isocyanate glycidyl ester, monomeric carbodiimide, aliphatic carbodiimide and aromatic carbodiimide; And / or, the second bio-based material is selected from one or more combinations of polylactic acid, polybutylene terephthalate-adipate, polybutylene succinate, polyhydroxyalkanoate, polycaprolactone, and polyglycolic acid.

6. The ultra-fine bio-based hydrolysis-resistant nonwoven fabric for wiping as claimed in claim 1, characterized in that: The fluff pulp fibers are obtained by opening paperboard fibers; and / or, the fluff pulp fibers account for 40-80% by weight of the nonwoven fabric; And / or, the fluff pulp fibers comprise 65-85% by weight of the composite layer.

7. The ultra-fine bio-based hydrolysis-resistant wiping nonwoven fabric according to any one of claims 1 to 5, characterized in that: The nonwoven fabric also includes a first bio-based hydrolysis-resistant meltblown layer, and the first bio-based hydrolysis-resistant meltblown layer is adjacent to the composite layer.

8. The ultra-fine bio-based hydrolysis-resistant nonwoven fabric for wiping as claimed in claim 7, characterized in that: The fiber fineness of the first bio-based hydrolysis-resistant meltblown layer is 1-20 um; And / or, the fiber fineness of the composite layer is 1-20 um; And / or, the density of the nonwoven fabric is (5-15)%.

9. The ultra-fine bio-based hydrolysis-resistant nonwoven fabric for wiping as claimed in claim 7, characterized in that: It also includes a second bio-based anti-hydrolysis melt-blown layer, and the composite layer is arranged between the first bio-based anti-hydrolysis melt-blown layer and the second bio-based anti-hydrolysis melt-blown layer.

10. The ultra-fine bio-based hydrolysis-resistant nonwoven fabric for wiping as claimed in claim 9, characterized in that: It also includes a first bio-based anti-hydrolysis spunbond layer and a second bio-based anti-hydrolysis spunbond layer, wherein the second bio-based anti-hydrolysis spunbond layer, the second bio-based anti-hydrolysis meltblown layer, the composite layer, the first bio-based anti-hydrolysis meltblown layer, and the first bio-based anti-hydrolysis spunbond layer are stacked in sequence.

11. The ultra-fine bio-based hydrolysis-resistant nonwoven fabric for wiping as claimed in claim 10, characterized in that: The first bio-based hydrolysis-resistant spunbond layer and the second bio-based hydrolysis-resistant spunbond layer have a gram weight of 5-20 gsm and a fiber fineness of 10-30 um; The density of the nonwoven fabric is (5-15)%.

12. The method for preparing the ultra-fine bio-based hydrolysis-resistant wiping nonwoven fabric according to any one of claims 1 to 11, comprising: The fluff pulp paperboard is crushed by open feeding, and the obtained fluff pulp fibers are quickly cut into the bio-based anti-hydrolysis layer and thermally mixed under the action of airflow to form a composite layer to provide a non-woven fabric.

13. Use of the ultra-fine bio-based hydrolysis-resistant wiping nonwoven fabric according to any one of claims 1 to 11 in the fields of beauty, hygiene, wiping, household and fast-moving consumer goods.

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