Degradable anti-static nonwoven fabric and method for manufacturing the same

Abstract

This invention relates to the field of nonwoven fabric technology, and provides a biodegradable antistatic nonwoven fabric and its preparation method. The biodegradable antistatic nonwoven fabric includes, from top to bottom, a first nonwoven base layer, an adhesive layer, an antibacterial layer, and a second nonwoven base layer. Both the first and second nonwoven base layers are provided with an antioxidant and moisture-absorbing coating. The antioxidant and moisture-absorbing coating is composed of the following components in parts by weight: 35-50 parts of polybutylene adipate, 30-40 parts of diethyl ether, 5-8 parts of phosphatidylethanolamine, 2-4 parts of polyvinyl acetate, 6-10 parts of polypropylene fumarate, and 1-3 parts of carboxymethyl cellulose. Phosphatidylethanolamine has good moisture absorption and antioxidant properties, which improves the antioxidant and moisture absorption properties of the first and second nonwoven base layers. The improved moisture absorption capacity improves the antistatic ability of the nonwoven fabric, and the improved antioxidant capacity improves the stability of the antibacterial layer on the nonwoven fabric, resulting in better antibacterial effect.

Description

Technical Field

[0001] This invention relates to the field of nonwoven fabric technology, and in particular to a biodegradable antistatic nonwoven fabric and its preparation method. Background Technology

[0002] Non-woven fabric, also known as non-woven cloth, is composed of oriented or randomly arranged fibers. It is called cloth because it resembles the appearance and some properties of fabric. Non-woven fabrics are characterized by moisture resistance, breathability, flexibility, light weight, non-flammability, easy decomposition, non-toxicity, non-irritation, rich colors, low price, and recyclability. However, non-woven fabrics themselves are not anti-static; in some environments, static electricity in non-woven fabrics can affect safety.

[0003] To impart antistatic properties to nonwoven fabrics, existing technologies typically involve applying an antistatic coating, such as through physical methods like impregnation, spraying, or ultrasonication. However, the bonding strength between most antistatic agents and nonwoven fibers is relatively weak, leading to the agent easily leaching from the fabric surface or evaporating. This results in a lack of lasting antistatic capability. Furthermore, if the antistatic agent leaches onto the surface, it can easily damage the surface of the object being wiped, or leave residue that contaminates the surface. Excessive residue can also negatively impact the properties of the object being wiped. Therefore, using antistatic agents to impart antistatic properties to nonwoven fabrics has certain limitations in application. Additionally, existing nonwoven fabrics do not possess excellent antibacterial properties, failing to effectively prevent microbial intrusion, making them prone to mold, odor, and short service life. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the present invention provides a biodegradable antistatic nonwoven fabric and its preparation method, aiming to solve the problems of existing nonwoven fabrics lacking durable antistatic ability, poor antistatic effect, ineffective antibacterial properties, and short service life.

[0005] The technical solution adopted by the present invention to solve its technical problem is as follows: On the one hand, the present invention provides a biodegradable antistatic nonwoven fabric, comprising a first nonwoven base layer, an adhesive layer, an antibacterial layer and a second nonwoven base layer arranged sequentially from top to bottom. Both the first nonwoven base layer and the second nonwoven base layer are provided with an antioxidant and moisture-absorbing coating. The antioxidant and moisture-absorbing coating is composed of the following components in parts by weight: 35-50 parts of polybutylene adipate, 30-40 parts of diethyl ether, 5-8 parts of phosphatidylethanolamine, 2-4 parts of polyvinyl acetate, 6-10 parts of polypropylene fumarate and 1-3 parts of carboxymethyl cellulose.

[0006] Preferably, the phosphatidylethanolamine is composed of glycerol, fatty acid, phosphoric acid and ethanolamine.

[0007] Preferably, the first nonwoven base layer is made of a blend of soybean protein fiber and seaweed fiber.

[0008] Preferably, the second nonwoven base layer is made of a blend of biodegradable polyester fibers and cotton fibers.

[0009] Preferably, the antibacterial layer is a polylactic acid antibacterial spray coating.

[0010] Preferably, the adhesive layer is a polyvinyl acetate adhesive layer.

[0011] On the other hand, the present invention also provides a method for preparing a biodegradable antistatic nonwoven fabric, the method comprising the following steps:

[0012] S1: Polybutylene adipate, polyvinyl acetate, polypropylene fumarate and carboxymethyl cellulose are added sequentially to diethyl ether and mixed and stirred evenly to obtain a mixed solution. Then, phosphatidylethanolamine is added to the mixed solution and mixed and stirred evenly to obtain an antioxidant and moisture-absorbing coating.

[0013] S2: The first pre-woven non-woven base layer is made by blending soybean protein fiber and seaweed fiber. The first pre-woven non-woven base layer is rinsed repeatedly with deionized water 5 to 10 times and then dried. The dried first pre-woven non-woven base layer is then soaked in an antioxidant moisture-absorbing coating for 30 to 45 minutes, then taken out and dried to obtain the first non-woven base layer with an antioxidant moisture-absorbing coating.

[0014] S3: The second pre-woven nonwoven base layer is made by blending biodegradable polyester fiber and cotton fiber. The second pre-woven nonwoven base layer is rinsed repeatedly with deionized water 5 to 10 times and then dried. The dried second pre-woven nonwoven base layer is then soaked in an antioxidant moisture-absorbing coating for 30 to 45 minutes, then removed and dried to obtain a second nonwoven base layer with an antioxidant moisture-absorbing coating.

[0015] S4: Apply polylactic acid antibacterial coating to the upper surface of the second nonwoven fabric base layer, and form an antibacterial layer after high-temperature baking;

[0016] S5: Polyvinyl acetate adhesive is coated on the upper surface of the antibacterial layer, and after being baked at high temperature, an adhesive layer is formed. Then, the lower surface of the first nonwoven base layer is laminated onto the upper surface of the adhesive layer to obtain the biodegradable antistatic nonwoven fabric.

[0017] The beneficial effects of this invention are as follows: Unlike existing technologies, the biodegradable antistatic nonwoven fabric of this invention comprises, from top to bottom, a first nonwoven base layer, an adhesive layer, an antibacterial layer, and a second nonwoven base layer. Both the first and second nonwoven base layers are provided with an antioxidant and moisture-absorbing coating. This coating is composed of the following components in parts by weight: 35-50 parts polybutylene adipate, 30-40 parts diethyl ether, 5-8 parts phosphatidylethanolamine, 2-4 parts polyvinyl acetate, 6-10 parts polypropylene fumarate, and 1-3 parts carboxymethyl cellulose. Phosphatidylethanolamine has good moisture absorption and antioxidant properties, thereby improving the antioxidant and moisture-absorbing properties of both the first and second nonwoven base layers. The improved moisture absorption capacity enhances the antistatic properties of the nonwoven fabric, and the improved antioxidant capacity improves the stability of the antibacterial layer on the nonwoven fabric, resulting in a better antibacterial effect. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a biodegradable antistatic nonwoven fabric in one embodiment of the present invention;

[0019] Figure 2 This is a flowchart illustrating the implementation of a method for preparing a biodegradable antistatic nonwoven fabric according to an embodiment of the present invention. Detailed Implementation

[0020] To more clearly illustrate the objectives, technical solutions, and advantages of the embodiments of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. It is clear and complete that the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0021] This invention provides a biodegradable antistatic nonwoven fabric, comprising, from top to bottom, a first nonwoven base layer 1, an adhesive layer 2, an antibacterial layer 3, and a second nonwoven base layer 4. Both the first nonwoven base layer 1 and the second nonwoven base layer 4 are provided with an antioxidant and moisture-absorbing coating, which is composed of the following components in parts by weight: 35-50 parts of polybutylene adipate, 30-40 parts of diethyl ether, 5-8 parts of phosphatidylethanolamine, 2-4 parts of polyvinyl acetate, 6-10 parts of polypropylene fumarate, and 1-3 parts of carboxymethyl cellulose.

[0022] Specifically, phosphatidylethanolamine is composed of glycerol, fatty acids, phosphoric acid, and ethanolamine. Phosphatidylethanolamine has unique biological activity and physiological functions, and is non-toxic, non-irritating, and does not pollute the environment. It has good hygroscopicity and antioxidant properties. The entire first nonwoven base layer 1 and the second nonwoven base layer 4 are soaked with an antioxidant and hygroscopic coating containing phosphatidylethanolamine, which makes the conductivity of the first nonwoven base layer 1 and the second nonwoven base layer 4 better and the antistatic effect significant.

[0023] Specifically, the first nonwoven base layer 1 is made of a blend of soybean protein fiber and seaweed fiber, both of which have good biodegradability. Among them, the bio-based carbon content of seaweed fiber is close to 100%, and its biodegradability is good. The limiting oxygen index of seaweed fiber reaches 45%, which means that seaweed fiber can only burn when the oxygen concentration reaches 45%. Therefore, when used in a normal temperature environment, seaweed fiber also has very good flame retardancy.

[0024] Specifically, the second nonwoven base layer 4 is made of a blend of biodegradable polyester fiber and cotton fiber. The biodegradable polyester fiber is a high-performance polyester fiber made of environmentally friendly biodegradable polyester material, which has good conductivity and biodegradability.

[0025] The present invention will be further described below with reference to specific embodiments one through four.

[0026] Example 1:

[0027] The biodegradable antistatic nonwoven fabric of Embodiment 1 of the present invention has the following structure: Figure 2 As shown, the structure includes a first nonwoven base layer 1, an adhesive layer 2, an antibacterial layer 3, and a second nonwoven base layer 4 arranged sequentially from top to bottom. Both the first nonwoven base layer 1 and the second nonwoven base layer 4 are provided with an antioxidant and moisture-absorbing coating. The antioxidant and moisture-absorbing coating is composed of the following components in parts by weight: 50 parts of polybutylene adipate, 35 parts of diethyl ether, 5 parts of phosphatidylethanolamine, 3 parts of polyvinyl acetate, 8 parts of polypropylene fumarate, and 1 part of carboxymethyl cellulose.

[0028] Example 2:

[0029] The biodegradable antistatic nonwoven fabric of Embodiment 2 of the present invention has the following structure: Figure 2 As shown, the structure includes a first nonwoven base layer 1, an adhesive layer 2, an antibacterial layer 3, and a second nonwoven base layer 4 arranged sequentially from top to bottom. Both the first nonwoven base layer 1 and the second nonwoven base layer 4 are provided with an antioxidant and moisture-absorbing coating. The antioxidant and moisture-absorbing coating is composed of the following components in parts by weight: 46 parts of polybutylene adipate, 40 parts of diethyl ether, 7 parts of phosphatidylethanolamine, 2 parts of polyvinyl acetate, 6 parts of polypropylene fumarate, and 2 parts of carboxymethyl cellulose.

[0030] Example 3:

[0031] The biodegradable antistatic nonwoven fabric of Embodiment 3 of the present invention has the following structure: Figure 2 As shown, the structure includes a first nonwoven base layer 1, an adhesive layer 2, an antibacterial layer 3, and a second nonwoven base layer 4 arranged sequentially from top to bottom. Both the first nonwoven base layer 1 and the second nonwoven base layer 4 are provided with an antioxidant and moisture-absorbing coating. The antioxidant and moisture-absorbing coating is composed of the following components in parts by weight: 35 parts polybutylene adipate, 30 parts diethyl ether, 8 parts phosphatidylethanolamine, 4 parts polyvinyl acetate, 10 parts polypropylene fumarate, and 3 parts carboxymethyl cellulose.

[0032] Example 4:

[0033] The preparation method of the biodegradable antistatic nonwoven fabric in Embodiment 4 of the present invention is as follows: Figure 1 The steps shown are as follows: S1 to S5:

[0034] S1: Add polybutylene adipate, polyvinyl acetate, polypropylene fumarate and carboxymethyl cellulose to diethyl ether in sequence, mix and stir evenly to obtain a mixed solution, then add phosphatidylethanolamine to the mixed solution and mix and stir evenly to obtain an antioxidant moisture-absorbing coating.

[0035] S2: The first pre-fabricated non-woven fabric base layer is made by blending soybean protein fiber and seaweed fiber. The first pre-fabricated non-woven fabric base layer is repeatedly rinsed with deionized water 6 times and then dried. The dried first pre-fabricated non-woven fabric base layer is then soaked in an antioxidant moisture-absorbing coating for 40 minutes, then taken out and dried to obtain the first non-woven fabric base layer with an antioxidant moisture-absorbing coating.

[0036] S3: The second pre-woven nonwoven base layer is made by blending biodegradable polyester fiber and cotton fiber. The second pre-woven nonwoven base layer is rinsed repeatedly with deionized water 10 times and then dried. The dried second pre-woven nonwoven base layer is then soaked in an antioxidant moisture-absorbing coating for 45 minutes, then removed and dried to obtain a second nonwoven base layer with an antioxidant moisture-absorbing coating.

[0037] S4: Apply polylactic acid antibacterial coating to the upper surface of the second nonwoven fabric base layer, and form an antibacterial layer after high-temperature baking;

[0038] S5: Polyvinyl acetate adhesive is coated on the upper surface of the antibacterial layer and baked at high temperature to form an adhesive layer. Then, the lower surface of the first nonwoven base layer is laminated on the upper surface of the adhesive layer to obtain a biodegradable antistatic nonwoven fabric.

[0039] In this embodiment, the antibacterial layer is a polylactic acid antibacterial coating; the adhesive layer is a polyvinyl acetate adhesive layer.

[0040] In this embodiment, the drying temperature is 40°C; the high-temperature baking temperature is 70°C.

[0041] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A biodegradable antistatic nonwoven fabric, comprising, from top to bottom, a first nonwoven base layer, an adhesive layer, an antibacterial layer, and a second nonwoven base layer, characterized in that, Both the first and second nonwoven fabric base layers are provided with an antioxidant and moisture-absorbing coating. The antioxidant and moisture-absorbing coating is composed of the following components in parts by weight: 35-50 parts of polybutylene adipate, 30-40 parts of diethyl ether, 5-8 parts of phosphatidylethanolamine, 2-4 parts of polyvinyl acetate, 6-10 parts of polypropylene fumarate, and 1-3 parts of carboxymethyl cellulose. The phosphatidylethanolamine is composed of glycerol, fatty acid, phosphoric acid, and ethanolamine.

2. The biodegradable antistatic nonwoven fabric according to claim 1, characterized in that, The first nonwoven base layer is made of a blend of soybean protein fiber and seaweed fiber.

3. The biodegradable antistatic nonwoven fabric according to claim 1, characterized in that, The second nonwoven base layer is made of a blend of biodegradable polyester and cotton fibers.

4. The biodegradable antistatic nonwoven fabric according to claim 1, characterized in that, The antibacterial layer is a polylactic acid antibacterial spray coating.

5. The biodegradable antistatic nonwoven fabric according to claim 1, characterized in that, The adhesive layer is a polyvinyl acetate adhesive layer.

6. A method for preparing a biodegradable antistatic nonwoven fabric, characterized in that, The method includes the following steps: S1: Polybutylene adipate, polyvinyl acetate, polypropylene fumarate and carboxymethyl cellulose are added sequentially to diethyl ether and mixed and stirred evenly to obtain a mixed solution. Then, phosphatidylethanolamine is added to the mixed solution and mixed and stirred evenly to obtain an antioxidant and moisture-absorbing coating. The phosphatidylethanolamine is composed of glycerol, fatty acid, phosphoric acid and ethanolamine. S2: The first pre-woven non-woven base layer is made by blending soybean protein fiber and seaweed fiber. The first pre-woven non-woven base layer is rinsed repeatedly with deionized water 5 to 10 times and then dried. The dried first pre-woven non-woven base layer is then soaked in an antioxidant moisture-absorbing coating for 30 to 45 minutes, then taken out and dried to obtain the first non-woven base layer with an antioxidant moisture-absorbing coating. S3: The second pre-woven nonwoven base layer is made by blending biodegradable polyester fiber and cotton fiber. The second pre-woven nonwoven base layer is rinsed repeatedly with deionized water 5 to 10 times and then dried. The dried second pre-woven nonwoven base layer is then soaked in an antioxidant moisture-absorbing coating for 30 to 45 minutes, then removed and dried to obtain a second nonwoven base layer with an antioxidant moisture-absorbing coating. S4: Apply polylactic acid antibacterial coating to the upper surface of the second nonwoven fabric base layer, and form an antibacterial layer after high-temperature baking; S5: Polyvinyl acetate adhesive is coated on the upper surface of the antibacterial layer, and after being baked at high temperature, an adhesive layer is formed. Then, the lower surface of the first nonwoven base layer is laminated onto the upper surface of the adhesive layer to obtain the biodegradable antistatic nonwoven fabric.

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