Degradable composite non-woven fabric

Abstract

The utility model discloses a degradable composite non-woven fabric, and belongs to the technical field of laminated non-woven fabrics. The utility model relates to a degradable composite non-woven fabric, which comprises a'three-layer 'structure consisting of a bio-based fiber non-woven fabric base layer, a degradable high polymer material laminated film upper layer and a degradable high polymer material laminated film lower layer, and viscose fiber pores in the bio-based fiber non-woven fabric base layer are uniformly distributed; the melt I in the upper layer of the degradable high polymer material lamination extends into the pores of the viscose fiber, the melt II in the lower layer of the degradable high polymer material lamination extends into the pores of the viscose fiber, and the melt I and the melt II are bonded in the pores of the viscose fiber; in addition, the degradable high polymer material in the degradable high polymer material spraying film upper layer forms a film I on the front side of the bio-based fiber non-woven fabric base layer, and the degradable high polymer material in the degradable high polymer material spraying film lower layer forms a film II on the back side of the bio-based fiber non-woven fabric base layer. According to the laminated non-woven fabric disclosed by the utility model, the structure of the laminated non-woven fabric is particularly limited, so that the obtained laminated non-woven fabric has the characteristics of degradability, high stiffness and difficulty in layering, and the subsequent requirements are met.

Description

Technical Field

[0001] The utility model relates to a degradable composite non-woven fabric, in particular to a composite non-woven fabric which is produced by regulating the structure of the non-woven fabric and adopting a degradable polymer melt coating, and belongs to the technical field of composite non-woven fabrics. Background Art

[0002] Non-woven fabrics have the effects of water absorption, heat preservation, insulation, and filtration, and can be used for vegetable preservation, filter bags, medical, sanitary industry, and automotive industry. At present, coated non-woven fabrics are mainly prepared with polypropylene spunbond non-woven fabrics or woven fabrics as the base and polyethylene as the coating raw material. The coated non-woven fabrics prepared by this method have the advantages of high strength and long service life. However, since polypropylene and polyethylene are both plastic products and cannot be degraded, they will cause great harm to the environment after use.

[0003] Although the prior art CN203974187U discloses "a bio-based degradable coating layer structure", the coating layer structure involved is easy to delaminate and has insufficient stiffness, etc. Therefore, a non-woven fabric with superior performance is needed. Summary of the invention

[0004] In order to solve the technical problems of the existing laminated non-woven fabrics, such as non-degradability, loose structure, easy delamination and insufficient stiffness, the utility model proposes a degradable composite non-woven fabric.

[0005] In order to achieve the above technical objectives, the following technical solutions are proposed:

[0006] A degradable composite nonwoven fabric comprises a bio-based fiber nonwoven fabric base layer, a degradable polymer material coating upper layer arranged on the front side of the bio-based fiber nonwoven fabric base layer, and a degradable polymer material coating lower layer arranged on the back side of the bio-based fiber nonwoven fabric base layer, wherein the degradable polymer material coating upper layer, the bio-based fiber nonwoven fabric base layer and the degradable polymer material coating lower layer are arranged in sequence from top to bottom;

[0007] The bio-based fiber non-woven fabric base layer is provided with viscose fiber pores formed by viscose fibers, and the viscose fiber pores are evenly distributed in the bio-based fiber non-woven fabric base layer;

[0008] Degradable polymer material coating upper layer: the melt I extends into the pores of the viscose fibers on the reverse side of the bio-based fiber non-woven fabric base layer, and the degradable polymer material in the degradable polymer material coating upper layer forms a film I on the front side of the bio-based fiber non-woven fabric base layer;

[0009] Degradable polymer material coating lower layer: melt II extends into the viscose fiber pores on the front side of the bio-based fiber non-woven fabric base layer, melt I and melt II bond in the viscose fiber pores; and the degradable polymer material in the degradable polymer material coating lower layer forms a film II on the back side of the bio-based fiber non-woven fabric base layer.

[0010] Furthermore, the thickness of the degradable coated non-woven fabric is 0.62-1.37 mm.

[0011] Furthermore, in the bio-based fiber non-woven fabric base layer, the viscose spunlace non-woven fabric has a gram weight of 50 to 120 g / m 2 , the length of the viscose fiber is 5 to 20 mm; and the thickness of the bio-based fiber non-woven fabric base layer is 0.32 to 0.87 mm.

[0012] Furthermore, the bio-based fiber non-woven fabric base layer is a regenerated cellulose fiber base layer or a natural bamboo-derived cellulose layer.

[0013] Furthermore, the thickness of the upper layer of the degradable polymer material coating after the degradable polymer material melt is cooled is 0.15-0.25 mm, and the thickness of the lower layer of the degradable polymer material coating after the degradable polymer material melt is cooled is 0.15-0.25 mm.

[0014] Furthermore, the degradable polymer material coating layer is a PBAT layer, a PCL layer or a PLA layer.

[0015] The positional relationships involved in this technical solution, such as "front side", "back side", "upper", "lower", "from top to bottom", "middle", "inside", and "between", are defined according to the situations under actual usage conditions. They are conventional terms in this technical field and are also conventional terms used by technical personnel in this field in actual usage.

[0016] The beneficial technical effects brought about by adopting this technical solution are:

[0017] 1. The utility model ensures that the obtained coated nonwoven fabric has the characteristics of being degradable, highly stiff, and not easy to delaminate by setting the upper layer of degradable polymer material coating, the base layer of bio-based fiber nonwoven fabric, and the lower layer of degradable polymer material coating, as well as the formation of film I and film II, so as to meet subsequent needs;

[0018] 2. In the utility model, the "three-layer" structure of the degradable polymer material coating upper layer, the bio-based fiber non-woven fabric base layer and the degradable polymer material coating lower layer is set, and melt I and melt II are bonded in the pores of the viscose fiber to ensure that the coated non-woven fabric forms a dense structure as a whole;

[0019] 3. In the utility model, the degradable polymer material has excellent compatibility with the viscose fiber. While ensuring the degradable characteristics of the coated non-woven fabric, it can better ensure the structural stability between the bio-based fiber non-woven fabric base layer, the degradable polymer material coated upper layer and the degradable polymer material coated lower layer, thereby improving the characteristics of the coated non-woven fabric, such as: high stiffness, not easy to delaminate, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a partial structural schematic diagram of the utility model;

[0021] Figure 2 It is a cross-sectional view of the utility model;

[0022] Figure 3 This is an electron microscope scanning image of the bio-based fiber non-woven fabric base layer in the utility model (without adding the degradable polymer material coating upper layer and the degradable polymer material coating lower layer);

[0023] Figure 4 This is a front electron microscope scanning image of the utility model (adding a degradable polymer material coating upper layer and a degradable polymer material coating lower layer);

[0024] Figure 5 This is an electron microscope scanning image of the reverse side of the utility model (adding a degradable polymer material coating upper layer and a degradable polymer material coating lower layer);

[0025] In the figure, 1. upper layer of degradable polymer material coating, 11. melt I, 12. film I, 2. bio-based fiber non-woven fabric base layer, 21. viscose fiber pores, 22. viscose fiber, 3. lower layer of degradable polymer material coating, 31. melt II, 32. film II. DETAILED DESCRIPTION

[0026] The following is a clear and complete description of the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] Example 1

[0028] A degradable composite nonwoven fabric, such as Figure 1-2As shown, it includes a bio-based fiber non-woven fabric base layer 2, a degradable polymer material coating upper layer 1 arranged on the front side of the bio-based fiber non-woven fabric base layer 2, and a degradable polymer material coating lower layer 3 arranged on the back side of the bio-based fiber non-woven fabric base layer 2, and the degradable polymer material coating upper layer 1, the bio-based fiber non-woven fabric base layer 2 and the degradable polymer material coating lower layer 3 are arranged in sequence from top to bottom;

[0029] The bio-based fiber non-woven fabric base layer 2 is provided with viscose fiber pores 21 formed by viscose fibers 22, and the viscose fiber pores 21 are evenly distributed in the bio-based fiber non-woven fabric base layer 2. The formation of the viscose fiber pores 21 can be achieved by combing the viscose fiber pores 21 to form uniform pores, such as Figure 3 As shown;

[0030] Degradable polymer material coating upper layer 1: the melt Ⅰ11 thereof extends into the viscose fiber pores 21 on the reverse side of the bio-based fiber non-woven fabric base layer 2, and the degradable polymer material in the degradable polymer material coating upper layer 1 forms a film Ⅰ12 on the front side of the bio-based fiber non-woven fabric base layer 2;

[0031] Degradable polymer material coating lower layer 3: the melt II31 therein extends into the viscose fiber pores 21 on the front side of the bio-based fiber non-woven fabric base layer 2, and the melt I11 and the melt II31 are bonded in the viscose fiber pores 21; and the degradable polymer material in the degradable polymer material coating lower layer 3 forms a film II32 on the back side of the bio-based fiber non-woven fabric base layer 2.

[0032] Among them, the thickness of the biodegradable coated non-woven fabric involved is 0.62 to 1.37 mm.

[0033] During the processing, the molten melt I11 on the front side penetrates, flows and solidifies through the pores of the viscose spunlace fabric to the back side, and the molten melt II31 on the back side penetrates, flows and solidifies through the pores of the viscose spunlace fabric to the front side, and fills the pores of the viscose spunlace non-woven fabric (belongs to the physical processing process), and the melt I11 and the melt II31 are bonded in the viscose fiber pores 21 to form a structurally complete whole, that is, the viscose fiber 22 is coated therein; and the degradable polymer material in the degradable polymer coating layer forms a thin film on the front and back sides of the viscose spunlace base layer, ensuring that the prepared coated composite non-woven fabric has high stiffness, overcoming the deficiency of stratification after single-sided coating of the spunlace non-woven fabric, and at the same time having high stiffness (such as Figure 4-5 as shown).

[0034] Example 2

[0035] On the basis of Example 1, this example further defines the bio-based fiber non-woven fabric base layer 2 to further illustrate the technical solution.

[0036] In the bio-based fiber non-woven fabric base 2, the viscose spunlace non-woven fabric has a gram weight of 50 to 120 g / m 2 , the length of the viscose fiber 22 is 5 to 20 mm. This setting makes it easy for the melt in the degradable polymer coating layer to penetrate the pores formed by the viscose fiber 22. For example, when the gram weight is lower than 50 gsm, the bio-based fiber non-woven fabric base layer 2 is unevenly formed, which in turn causes the gram weight of the degradable polymer coating layer to be uneven; when the gram weight is higher than 120 gsm, the bio-based fiber non-woven fabric base layer 2 is too thick, and the pores formed by the viscose fiber 22 are small, which is not conducive to the melt in the degradable polymer coating layer to penetrate the pores to form a whole bonded on both sides (both sides of the bio-based fiber non-woven fabric base layer 2); in the degradable polymer coating layer, the gram weight of the degradable polymer coating is 10 to 25 g / m 2 If the gram weight of the degradable polymer coating layer is lower than 10g / m2, the degradable coated non-woven fabric will have no stiffness and strong flexibility, which is not conducive to the preparation of packaging materials; if the gram weight of the degradable coated non-woven fabric is higher than 25g / m2, the degradable coated non-woven fabric will become thicker and easy to bend and crack. For this reason, the definition of the structure of the degradable coated non-woven fabric ensures that the bio-based fiber non-woven fabric base layer 2 and the degradable polymer coating layer form a bonded whole, which ensures that the coated non-woven fabric is degradable and environmentally friendly; and ensures that the coated non-woven fabric has the characteristics of high stiffness to meet actual needs. And the thickness of the bio-based fiber non-woven fabric base layer 2 is 0.32-0.87mm.

[0037] The number of pores in viscose fiber is 40 to 50 per cm 2 .

[0038] The bio-based fiber non-woven fabric base layer 2 is a regenerated cellulose fiber base layer or a natural bamboo-derived cellulose layer.

[0039] Example 3

[0040] On the basis of Example 1, this example further defines the degradable polymer material coating upper layer 1 to further illustrate the technical solution.

[0041] The thickness of the degradable polymer material coating upper layer 1 after the degradable polymer material melt is cooled is 0.15-0.25 mm, wherein the degradable polymer material coating upper layer 1 is a PBAT layer, a PCL layer or a PLA layer.

[0042] Example 4

[0043] On the basis of Example 1, this example further defines the degradable polymer material coating lower layer 3 to further illustrate the technical solution.

[0044] The thickness of the degradable polymer material coating lower layer 3 after the degradable polymer material melt is cooled is 0.15-0.25 mm, wherein the degradable polymer material coating lower layer 3 is a PBAT layer, a PCL layer or a PLA layer.

Claims

1. A degradable composite nonwoven fabric, characterized in that: It comprises a bio-based fiber non-woven fabric base layer (2), a degradable polymer material coating upper layer (1) arranged on the front side of the bio-based fiber non-woven fabric base layer (2), and a degradable polymer material coating lower layer (3) arranged on the back side of the bio-based fiber non-woven fabric base layer (2), wherein the degradable polymer material coating upper layer (1), the bio-based fiber non-woven fabric base layer (2), and the degradable polymer material coating lower layer (3) are arranged in order from top to bottom; The bio-based fiber non-woven fabric base layer (2) is provided with viscose fiber pores (21) formed by viscose fibers (22), and the viscose fiber pores (21) are evenly distributed in the bio-based fiber non-woven fabric base layer (2); the melt I (11) in the upper layer (1) of the degradable polymer material coating extends into the viscose fiber pores (21) on the back side of the bio-based fiber non-woven fabric base layer (2), and the melt II (31) in the lower layer (3) of the degradable polymer material coating extends into the viscose fiber pores (21) on the back side of the bio-based fiber non-woven fabric base layer (2). The melt I (11) and the melt II (31) extend into the viscose fiber pores (21) on the front side of the fabric base layer (2), and the melt I (11) and the melt II (31) are bonded in the viscose fiber pores (21); and the degradable polymer material in the degradable polymer material coating upper layer (1) forms a film I (12) on the front side of the bio-based fiber non-woven fabric base layer (2), and the degradable polymer material in the degradable polymer material coating lower layer (3) forms a film II (32) on the back side of the bio-based fiber non-woven fabric base layer (2).

2. The degradable composite nonwoven fabric according to claim 1, characterized in that: The thickness of the degradable composite non-woven fabric is 0.62-1.37 mm.

3. The degradable composite nonwoven fabric according to claim 1, characterized in that: In the bio-based fiber non-woven fabric base layer (2), the viscose spunlace non-woven fabric has a gram weight of 50 to 120 g / m2, and the viscose fiber (22) has a length of 5 to 20 mm.

4. The degradable composite nonwoven fabric according to claim 1 or 3, characterized in that: The bio-based fiber non-woven fabric base layer (2) has a thickness of 0.32 to 0.87 mm.

5. The degradable composite nonwoven fabric according to claim 4, characterized in that: The number of the viscose fiber pores (21) is 40 to 50 per cm2.

6. The degradable composite nonwoven fabric according to claim 1, characterized in that: The bio-based fiber non-woven fabric base layer (2) is a regenerated cellulose fiber base layer or a natural bamboo-derived cellulose layer.

7. The degradable composite nonwoven fabric according to claim 1, characterized in that: The thickness of the upper layer (1) of the degradable polymer material coating after the degradable polymer material melt is cooled is 0.15 to 0.25 mm, and the thickness of the lower layer (3) of the degradable polymer material coating after the degradable polymer material melt is cooled is 0.15 to 0.25 mm.

8. The degradable composite nonwoven fabric according to claim 1 or 7, characterized in that: The degradable polymer material coating layer is a PBAT layer, a PCL layer or a PLA layer.

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