A waterproof isolation gown and its manufacturing process

Abstract

This application discloses a waterproof isolation gown and its manufacturing process, relating to the field of isolation gowns. It comprises a biodegradable base layer, a waterproof fabric layer, and a waterproof coating. The waterproof fabric layer is made from the following raw materials in parts by weight: polyvinyl alcohol: 8-12 parts; solvent: 93-97 parts; fumed silica: 0.5-1.4 parts; magnesium aluminum hydrotalcite: 0.1-1 parts. The waterproof coating is made from the following raw materials in parts by weight: waterborne polyurethane: 95-100 parts; stearic acid: 2-4 parts; crosslinking agent: 0.9-1.1 parts; defoamer: 0.1-0.3 parts. This application improves the waterproofness and breathability of the biodegradable isolation gown.

Description

Technical Field

[0001] This application relates to the field of isolation gowns, and in particular to a waterproof isolation gown and its manufacturing process. Background Technology

[0002] The main function of isolation gowns is to prevent contamination from blood, bodily fluids, and other infectious substances. They are commonly used in the medical field and are available in disposable and non-disposable forms. Because they are used in environments that are easily contaminated and are difficult to reuse, disposable isolation gowns are used more widely.

[0003] Disposable isolation gowns are usually made of polypropylene nonwoven fabric as the main material. Since disposable isolation gowns are consumables, their consumption is large and they are difficult to degrade in a short period of time. Considering environmental factors, some studies are currently using polylactic acid fabric or biodegradable polyurethane fabric as the main material to make disposable isolation gowns.

[0004] However, the waterproof and breathable properties of isolation gowns made from biodegradable materials are urgent issues that need to be addressed. Summary of the Invention

[0005] To improve the poor waterproofness and breathability of isolation gowns made from biodegradable materials, this application provides a waterproof isolation gown and its manufacturing process.

[0006] On the one hand, the waterproof isolation gown provided in this application adopts the following technical solution:

[0007] A waterproof protective garment includes a biodegradable base layer, a waterproof fabric layer, and a waterproof coating, wherein the waterproof fabric layer is made of raw materials comprising the following parts by weight:

[0008] Polyvinyl alcohol: 8-12 parts;

[0009] Solvent: 93-97 parts;

[0010] Fumed nano-silica: 0.5-1.4 parts;

[0011] Magnesium aluminum hydrotalcite: 0.1-1 part;

[0012] The waterproof coating is made from raw materials comprising the following parts by weight;

[0013] Waterborne polyurethane: 95-100 parts;

[0014] Stearic acid: 2-4 parts;

[0015] Crosslinking agent: 0.9-1.1 parts;

[0016] Defoamer: 0.1-0.3 parts.

[0017] By adopting the above technical solution, a biodegradable base layer is used as the main material to improve the biodegradability of the isolation gown. Then, a waterproof fabric layer and a waterproof coating are used to waterproof the surface of the biodegradable base layer. On the one hand, biodegradable polyvinyl alcohol is used to facilitate its degradation. On the other hand, fumed silica nanoparticles and layered magnesium aluminum hydrotalcite can reduce the surface energy of the waterproof fabric layer, prevent water droplet adhesion, and improve its waterproof performance. At the same time, the nanoparticles of silica and the layered structure of magnesium aluminum hydrotalcite can also form channels for air to pass through, improving the breathability of the isolation gown. The water-based polyurethane coating increases the breathability and waterproofness of the waterproof fabric layer, while the stearic acid in it can also improve the waterproof effect of polyvinyl alcohol. Under the combined effect, the waterproofness and breathability of the biodegradable isolation gown are improved.

[0018] Optionally, the solvent includes one or more of water, ethanol, and acetone.

[0019] Preferably, the solvent consists of 88-92 parts by weight of water and 3-7 parts by weight of ethanol.

[0020] Preferably, the weight ratio of the sum of the fumed nano-silica and the magnesium aluminum hydrotalcite to the weight of the ethanol is 3:(6-14).

[0021] By adopting the above technical solution, water and ethanol are selected as solvents, and the weight ratio of ethanol and fumed nano silica to magnesium aluminum hydrotalcite is controlled, thereby improving the solubility of polyvinyl alcohol in the solvent and the dispersion effect of fumed nano silica and magnesium aluminum hydrotalcite.

[0022] Optionally, the waterproof fabric layer is prepared by the following steps: mixing and stirring polyvinyl alcohol, fumed nano silica, magnesium aluminum hydrotalcite and solvent until the polyvinyl alcohol is dissolved, ultrasonicating to obtain a spinning agent, and using the spinning agent to perform electrospinning on the substrate, thereby forming a waterproof fabric layer on the substrate.

[0023] Preferably, the substrate is polyester or polypropylene nonwoven fabric.

[0024] Preferably, the substrate is polyester.

[0025] By adopting the above technical solution, a waterproof fabric layer is formed on the substrate surface by electrospinning. On the one hand, the fibers of the waterproof fabric layer are evenly distributed and the porosity is easy to control. On the other hand, the uniformity of the distribution of fumed nano silica and magnesium aluminum hydrotalcite is improved. Furthermore, using polyester with good breathability as the substrate can also minimize the risk of poor breathability.

[0026] Optionally, the spinning agent is prepared by the following steps: mixing polyvinyl alcohol and water to obtain a polyvinyl alcohol solution, mixing ethanol, fumed nano silica and magnesium aluminum hydrotalcite and mixing them with the polyvinyl alcohol solution, and then sonicating.

[0027] Preferably, the ultrasound duration is 0.5-2 hours.

[0028] By adopting the above technical solution, fumed silica and magnesium aluminum hydrotalcite are wetted with ethanol and then mixed with polyvinyl alcohol solution. This avoids agglomeration of fumed silica and magnesium aluminum hydrotalcite as much as possible, and improves the dispersion effect of fumed silica and magnesium aluminum hydrotalcite. Furthermore, ultrasonic exfoliation of the layered structure of magnesium aluminum hydrotalcite further improves the dispersion effect and uniformity of the layered structure of magnesium aluminum hydrotalcite and fumed silica particles in polyvinyl alcohol solution.

[0029] On the other hand, the manufacturing process of the waterproof isolation gown provided in this application adopts the following technical solution:

[0030] A manufacturing process for a waterproof isolation gown includes sequentially forming a waterproof fabric layer and a waterproof coating layer on a biodegradable base layer, and then cutting and splicing them together to produce the waterproof isolation gown.

[0031] Preferably, the process of sequentially forming a waterproof fabric layer and a waterproof coating on the biodegradable base layer includes the following steps: forming a waterproof fabric layer on the substrate, then hot-melt bonding the substrate with the formed waterproof fabric layer to the biodegradable base layer, and forming a waterproof coating on the side of the waterproof fabric layer away from the biodegradable base layer.

[0032] By adopting the above technical solution, the base with the waterproof fabric layer is first heat-fused to the biodegradable base layer inside the casing, and then the waterproof coating is formed. This avoids damage to the waterproof coating during the heat-fusion bonding process as much as possible, thus improving the waterproofness of the isolation gown. Furthermore, the use of heat-fusion bonding seals the larger pores on the biodegradable base layer, further enhancing the waterproofness.

[0033] In summary, this application includes at least one of the following beneficial technical effects:

[0034] 1. A biodegradable base layer is used as the main material to improve the biodegradability of the isolation gown. Then, the surface of the biodegradable base layer is waterproofed through a waterproof fabric layer and a waterproof coating. On the one hand, biodegradable polyvinyl alcohol is used to facilitate its degradation. On the other hand, fumed nano-silica and layered magnesium aluminum hydrotalcite can reduce the surface energy of the waterproof fabric layer, prevent water droplet adhesion, and improve its waterproof performance. At the same time, the nanoparticles of silica and the layered structure of magnesium aluminum hydrotalcite can also form channels for air to pass through, improving the breathability of the isolation gown. The water-based polyurethane coating increases the breathability and waterproofness of the waterproof fabric layer, while the stearic acid in it can also improve the waterproof effect of polyvinyl alcohol.

[0035] 2. Electrospinning forms a waterproof fabric layer on the substrate surface, which on the one hand makes the fibers of the waterproof fabric layer evenly distributed and makes it easy to control the porosity; on the other hand, it improves the uniformity of the distribution of fumed nano silica and magnesium aluminum hydrotalcite, and using polyester with good air permeability as the substrate can also avoid poor air permeability as much as possible.

[0036] 3. First, the base with the pre-formed waterproof fabric layer is heat-fused to the biodegradable base layer inside the casing before the waterproof coating is formed. This process minimizes damage to the waterproof coating during heat fusion bonding, thus improving the waterproofness of the isolation gown. Furthermore, the use of heat fusion bonding seals larger pores on the biodegradable base layer, further enhancing its waterproofness. Detailed Implementation

[0037] The present application will be further described in detail below with reference to the embodiments. The following embodiments are for illustrative purposes only and should not be considered as limiting the scope of the invention. Unless otherwise specified, specific conditions in the following embodiments were performed under conventional conditions or conditions recommended by the manufacturer. Unless otherwise specified, the methods used are conventional methods known in the art, and the consumables and reagents used are commercially available. Unless otherwise stated, the technical and scientific terms used herein have the same meaning as those familiar to those skilled in the art. Furthermore, any methods or materials similar to or equivalent to those described herein may also be applied to the present invention.

[0038] All raw materials used in the examples are commercially available.

[0039] Example 1

[0040] Example 1 provides a waterproof isolation gown, the preparation process of which is as follows:

[0041] Forming of the waterproof fabric layer: Take 8 kg of polyvinyl alcohol, 92 kg of water, 5 kg of ethanol, 1 kg of fumed nano silica and 0.5 kg of magnesium aluminum hydrotalcite, mix and stir until the polyvinyl alcohol is dissolved, and sonicate for 0.5 h to obtain a spinning agent; attach polyester as a substrate to the roller of the receiver, and use an electrospinning device to spin. During the spinning process, the spinning voltage is set to 12 kV, the spinning speed is 0.5 ml / L, the distance between the spinneret and the collector is 13 cm, the temperature is (25±3)℃, and the humidity is (40±5)%. The waterproof fabric layer is formed on the polyester.

[0042] Forming of the waterproof coating: Mix 3kg stearic acid, 95kg waterborne polyurethane, 0.9kg crosslinking agent and 0.1kg defoamer evenly, and sonicate for 30 minutes to obtain a waterproof coating. Apply the waterproof coating to the waterproof fabric layer and cure to obtain the waterproof coating layer.

[0043] Garment making: Polyester with a waterproof coating and waterproof fabric layer is heat-fused to a biodegradable base layer, and then cut and spliced ​​to make a waterproof isolation garment.

[0044] In this embodiment, the average particle size of the fumed nano-silica is 40 nm, the degree of polymerization of polyvinyl alcohol is 1700 and the degree of alcoholysis is 88%, the waterborne polyurethane is an anionic waterborne polyurethane with a solid content of 40% and a pH of 7-9, the crosslinking agent is aziridine crosslinking agent, the defoamer is a polyether-modified organosilicon defoamer, and the biodegradable base layer is polylactic acid fabric.

[0045] Example 2

[0046] Example 2 provides a waterproof isolation garment, the preparation process of which is as follows:

[0047] Forming of the waterproof fabric layer: Take 10kg polyvinyl alcohol, 90kg water, 5kg ethanol, 1kg fumed nano silica and 0.5kg magnesium aluminum hydrotalcite, mix and stir until the polyvinyl alcohol is dissolved, and sonicate for 0.5h to obtain a spinning agent; attach polyester as a substrate to the roller of the receiver, and use an electrospinning device to spin. During the spinning process, the spinning voltage is set to 12kV, the spinning speed is 0.5ml / L, the distance between the spinneret and the collector is 13cm, the temperature is (25±3)℃, and the humidity is (40±5)%. The waterproof fabric layer is formed on the polyester.

[0048] Forming of the waterproof coating: Mix 3kg stearic acid, 97kg waterborne polyurethane, 1kg crosslinking agent and 0.2kg defoamer evenly, and sonicate for 30 minutes to obtain a waterproof coating. Apply the waterproof coating to the waterproof fabric layer and cure to obtain the waterproof coating layer.

[0049] Garment making: Polyester with a waterproof coating and waterproof fabric layer is heat-fused to a biodegradable base layer, and then cut and spliced ​​to make a waterproof isolation garment.

[0050] In this embodiment, the average particle size of the fumed nano-silica is 40 nm, the degree of polymerization of polyvinyl alcohol is 1700 and the degree of alcoholysis is 88%, the waterborne polyurethane is an anionic waterborne polyurethane with a solid content of 40% and a pH of 7-9, the crosslinking agent is aziridine crosslinking agent, the defoamer is a polyether-modified organosilicon defoamer, and the biodegradable base layer is polylactic acid fabric.

[0051] Example 3

[0052] Example 3 provides a waterproof isolation garment, the preparation process of which is as follows:

[0053] Forming of the waterproof fabric layer: Take 12kg polyvinyl alcohol, 88kg water, 5kg ethanol, 1kg fumed nano silica and 0.5kg magnesium aluminum hydrotalcite, mix and stir until polyvinyl alcohol is dissolved, and sonicate for 0.5h to obtain a spinning agent; attach polyester as a substrate to the roller of the receiver, and use an electrospinning device to spin. During the spinning process, the spinning voltage is set to 12kV, the spinning speed is 0.5ml / L, the distance between the spinneret and the collector is 13cm, the temperature is (25±3)℃, and the humidity is (40±5)%. The waterproof fabric layer is formed on the polyester.

[0054] Forming of the waterproof coating: Mix 3 kg of stearic acid, 100 kg of waterborne polyurethane, 1.1 kg of crosslinking agent and 0.3 kg of defoamer evenly, and sonicate for 30 min to obtain a waterproof coating. Apply the waterproof coating to the waterproof fabric layer and cure to obtain the waterproof coating layer.

[0055] Garment making: Polyester with a waterproof coating and waterproof fabric layer is heat-fused to a biodegradable base layer, and then cut and spliced ​​to make a waterproof isolation garment.

[0056] In this embodiment, the average particle size of the fumed nano-silica is 40 nm, the degree of polymerization of polyvinyl alcohol is 1700 and the degree of alcoholysis is 88%, the waterborne polyurethane is an anionic waterborne polyurethane with a solid content of 40% and a pH of 7-9, the crosslinking agent is aziridine crosslinking agent, the defoamer is a polyether-modified organosilicon defoamer, and the biodegradable base layer is polylactic acid fabric.

[0057] Example 4

[0058] Example 4 provides a waterproof isolation garment, the preparation process of which is as follows:

[0059] Forming of the waterproof fabric layer: Take 10kg polyvinyl alcohol, 90kg water, 3kg ethanol, 1kg fumed nano silica and 0.5kg magnesium aluminum hydrotalcite, mix and stir until the polyvinyl alcohol is dissolved, and sonicate for 0.5h to obtain a spinning agent; attach polyester as a substrate to the roller of the receiver, and use an electrospinning device to spin. During the spinning process, the spinning voltage is set to 12kV, the spinning speed is 0.5ml / L, the distance between the spinneret and the collector is 13cm, the temperature is (25±3)℃, and the humidity is (40±5)%. The waterproof fabric layer is formed on the polyester.

[0060] Forming of the waterproof coating: Mix 3kg stearic acid, 97kg waterborne polyurethane, 1kg crosslinking agent and 0.2kg defoamer evenly, and sonicate for 30 minutes to obtain a waterproof coating. Apply the waterproof coating to the waterproof fabric layer and cure to obtain the waterproof coating layer.

[0061] Garment making: Polyester with a waterproof coating and waterproof fabric layer is heat-fused to a biodegradable base layer, and then cut and spliced ​​to make a waterproof isolation garment.

[0062] In this embodiment, the average particle size of the fumed nano-silica is 40 nm, the degree of polymerization of polyvinyl alcohol is 1700 and the degree of alcoholysis is 88%, the waterborne polyurethane is an anionic waterborne polyurethane with a solid content of 40% and a pH of 7-9, the crosslinking agent is aziridine crosslinking agent, the defoamer is a polyether-modified organosilicon defoamer, and the biodegradable base layer is polylactic acid fabric.

[0063] Example 5

[0064] Example 5 provides a waterproof isolation garment, the preparation process of which is as follows:

[0065] Forming of the waterproof fabric layer: Take 10kg polyvinyl alcohol, 90kg water, 7kg ethanol, 1kg fumed nano silica and 0.5kg magnesium aluminum hydrotalcite, mix and stir until polyvinyl alcohol is dissolved, and sonicate for 0.5h to obtain a spinning agent; attach polyester as a substrate to the roller of the receiver, and use an electrospinning device to spin. During the spinning process, the spinning voltage is set to 12kV, the spinning speed is 0.5ml / L, the distance between the spinneret and the collector is 13cm, the temperature is (25±3)℃, and the humidity is (40±5)%. The waterproof fabric layer is formed on the polyester.

[0066] Forming of the waterproof coating: Mix 3kg stearic acid, 97kg waterborne polyurethane, 1kg crosslinking agent and 0.2kg defoamer evenly, and sonicate for 30 minutes to obtain a waterproof coating. Apply the waterproof coating to the waterproof fabric layer and cure to obtain the waterproof coating layer.

[0067] Garment making: Polyester with a waterproof coating and waterproof fabric layer is heat-fused to a biodegradable base layer, and then cut and spliced ​​to make a waterproof isolation garment.

[0068] In this embodiment, the average particle size of the fumed nano-silica is 40 nm, the degree of polymerization of polyvinyl alcohol is 1700 and the degree of alcoholysis is 88%, the waterborne polyurethane is an anionic waterborne polyurethane with a solid content of 40% and a pH of 7-9, the crosslinking agent is aziridine crosslinking agent, the defoamer is a polyether-modified organosilicon defoamer, and the biodegradable base layer is polylactic acid fabric.

[0069] Example 6

[0070] Example 6 provides a waterproof isolation garment, the preparation process of which is as follows:

[0071] Forming of the waterproof fabric layer: Take 10kg polyvinyl alcohol, 90kg water, 5kg ethanol, 1.4kg fumed nano silica and 0.1kg magnesium aluminum hydrotalcite, mix and stir until the polyvinyl alcohol is dissolved, and sonicate for 0.5h to obtain a spinning agent; attach polyester as a substrate to the roller of the receiver, and use an electrospinning device to spin. During the spinning process, the spinning voltage is set to 12kV, the spinning speed is 0.5ml / L, the distance between the spinneret and the collector is 13cm, the temperature is (25±3)℃, and the humidity is (40±5)%. The waterproof fabric layer is formed on the polyester.

[0072] Forming of the waterproof coating: Mix 3kg stearic acid, 97kg waterborne polyurethane, 1kg crosslinking agent and 0.2kg defoamer evenly, and sonicate for 30 minutes to obtain a waterproof coating. Apply the waterproof coating to the waterproof fabric layer and cure to obtain the waterproof coating layer.

[0073] Garment making: Polyester with a waterproof coating and waterproof fabric layer is heat-fused to a biodegradable base layer, and then cut and spliced ​​to make a waterproof isolation garment.

[0074] In this embodiment, the average particle size of the fumed nano-silica is 40 nm, the degree of polymerization of polyvinyl alcohol is 1700 and the degree of alcoholysis is 88%, the waterborne polyurethane is an anionic waterborne polyurethane with a solid content of 40% and a pH of 7-9, the crosslinking agent is aziridine crosslinking agent, the defoamer is a polyether-modified organosilicon defoamer, and the biodegradable base layer is polylactic acid fabric.

[0075] Example 7

[0076] Example 7 provides a waterproof isolation gown, the preparation process of which is as follows:

[0077] Forming of the waterproof fabric layer: Take 10kg polyvinyl alcohol, 90kg water, 5kg ethanol, 0.5kg fumed nano silica and 1kg magnesium aluminum hydrotalcite, mix and stir until the polyvinyl alcohol is dissolved, and sonicate for 0.5h to obtain a spinning agent; attach polyester as a substrate to the roller of the receiver, and use an electrospinning device to spin. During the spinning process, the spinning voltage is set to 12kV, the spinning speed is 0.5ml / L, the distance between the spinneret and the collector is 13cm, the temperature is (25±3)℃, and the humidity is (40±5)%. The waterproof fabric layer is formed on the polyester.

[0078] Forming of the waterproof coating: Mix 3kg stearic acid, 97kg waterborne polyurethane, 1kg crosslinking agent and 0.2kg defoamer evenly, and sonicate for 30 minutes to obtain a waterproof coating. Apply the waterproof coating to the waterproof fabric layer and cure to obtain the waterproof coating layer.

[0079] Garment making: Polyester with a waterproof coating and waterproof fabric layer is heat-fused to a biodegradable base layer, and then cut and spliced ​​to make a waterproof isolation garment.

[0080] In this embodiment, the average particle size of the fumed nano-silica is 40 nm, the degree of polymerization of polyvinyl alcohol is 1700 and the degree of alcoholysis is 88%, the waterborne polyurethane is an anionic waterborne polyurethane with a solid content of 40% and a pH of 7-9, the crosslinking agent is aziridine crosslinking agent, the defoamer is a polyether-modified organosilicon defoamer, and the biodegradable base layer is polylactic acid fabric.

[0081] Example 8

[0082] Example 8 provides a waterproof isolation gown, the preparation process of which is as follows:

[0083] Forming of the waterproof fabric layer: Take 10kg polyvinyl alcohol, 90kg water, 5kg ethanol, 1kg fumed nano silica and 0.5kg magnesium aluminum hydrotalcite, mix and stir until the polyvinyl alcohol is dissolved, and sonicate for 0.5h to obtain a spinning agent; attach polyester as a substrate to the roller of the receiver, and use an electrospinning device to spin. During the spinning process, the spinning voltage is set to 12kV, the spinning speed is 0.5ml / L, the distance between the spinneret and the collector is 13cm, the temperature is (25±3)℃, and the humidity is (40±5)%. The waterproof fabric layer is formed on the polyester.

[0084] Forming of the waterproof coating: Mix 2kg stearic acid, 97kg waterborne polyurethane, 1kg crosslinking agent and 0.2kg defoamer evenly, and sonicate for 30 minutes to obtain a waterproof coating. Apply the waterproof coating to the waterproof fabric layer and cure to obtain the waterproof coating.

[0085] Garment making: Polyester with a waterproof coating and waterproof fabric layer is heat-fused to a biodegradable base layer, and then cut and spliced ​​to make a waterproof isolation garment.

[0086] In this embodiment, the average particle size of the fumed nano-silica is 40 nm, the degree of polymerization of polyvinyl alcohol is 1700 and the degree of alcoholysis is 88%, the waterborne polyurethane is an anionic waterborne polyurethane with a solid content of 40% and a pH of 7-9, the crosslinking agent is aziridine crosslinking agent, the defoamer is a polyether-modified organosilicon defoamer, and the biodegradable base layer is polylactic acid fabric.

[0087] Example 9

[0088] Example 9 provides a waterproof isolation garment, the preparation process of which is as follows:

[0089] Forming of the waterproof fabric layer: Take 10kg polyvinyl alcohol, 90kg water, 5kg ethanol, 1kg fumed nano silica and 0.5kg magnesium aluminum hydrotalcite, mix and stir until the polyvinyl alcohol is dissolved, and sonicate for 0.5h to obtain a spinning agent; attach polyester as a substrate to the roller of the receiver, and use an electrospinning device to spin. During the spinning process, the spinning voltage is set to 12kV, the spinning speed is 0.5ml / L, the distance between the spinneret and the collector is 13cm, the temperature is (25±3)℃, and the humidity is (40±5)%. The waterproof fabric layer is formed on the polyester.

[0090] Forming of the waterproof coating: Mix 4 kg of stearic acid, 97 kg of waterborne polyurethane, 1 kg of crosslinking agent and 0.2 kg of defoamer evenly, and sonicate for 30 min to obtain a waterproof coating. Apply the waterproof coating to the waterproof fabric layer and cure to obtain the waterproof coating layer.

[0091] Garment making: Polyester with a waterproof coating and waterproof fabric layer is heat-fused to a biodegradable base layer, and then cut and spliced ​​to make a waterproof isolation garment.

[0092] In this embodiment, the average particle size of the fumed nano-silica is 40 nm, the degree of polymerization of polyvinyl alcohol is 1700 and the degree of alcoholysis is 88%, the waterborne polyurethane is an anionic waterborne polyurethane with a solid content of 40% and a pH of 7-9, the crosslinking agent is aziridine crosslinking agent, the defoamer is a polyether-modified organosilicon defoamer, and the biodegradable base layer is polylactic acid fabric.

[0093] Example 10

[0094] Example 10 provides a waterproof isolation gown, the preparation process of which is as follows:

[0095] Forming of the waterproof fabric layer: Take 10kg polyvinyl alcohol, 90kg water, 5kg ethanol, 1kg fumed nano silica and 0.5kg magnesium aluminum hydrotalcite, mix and stir until the polyvinyl alcohol is dissolved, and sonicate for 0.5h to obtain a spinning agent; attach polypropylene nonwoven fabric as a substrate to the roller of the receiver, and use an electrospinning device to spin. During the spinning process, the spinning voltage is set to 12kV, the spinning speed is 0.5ml / L, the distance between the spinneret and the collector is 13cm, the temperature is (25±3)℃, and the humidity is (40±5)%. The waterproof fabric layer is formed on polyester.

[0096] Forming of the waterproof coating: Mix 3kg stearic acid, 97kg waterborne polyurethane, 1kg crosslinking agent and 0.2kg defoamer evenly, and sonicate for 30 minutes to obtain a waterproof coating. Apply the waterproof coating to the waterproof fabric layer and cure to obtain the waterproof coating layer.

[0097] Garment making: Polypropylene nonwoven fabric with a waterproof coating and waterproof fabric layer is heat-fused to a biodegradable base layer, and then cut and spliced ​​to make a waterproof isolation garment.

[0098] In this embodiment, the average particle size of the fumed nano-silica is 40 nm, the degree of polymerization of polyvinyl alcohol is 1700 and the degree of alcoholysis is 88%, the waterborne polyurethane is an anionic waterborne polyurethane with a solid content of 40% and a pH of 7-9, the crosslinking agent is aziridine crosslinking agent, the defoamer is a polyether-modified organosilicon defoamer, and the biodegradable base layer is polylactic acid fabric.

[0099] Example 11

[0100] Example 11 provides a waterproof isolation gown, the preparation process of which is as follows:

[0101] Forming of the waterproof fabric layer: Take 10 kg of polyvinyl alcohol and 90 kg of water, mix and stir until the polyvinyl alcohol dissolves to obtain a polyvinyl alcohol solution. Take 5 kg of ethanol, 1 kg of fumed nano silica and 0.5 kg of magnesium aluminum hydrotalcite, mix and stir, and add to the polyvinyl alcohol aqueous solution. Stir and sonicate for 0.5 h to obtain a spinning agent. Attach polyester as a substrate to the roller of the receiver and use an electrospinning device for spinning. During the spinning process, the spinning voltage is set to 12 kV, the spinning speed is 0.5 ml / L, the distance between the spinneret and the collector is 13 cm, the temperature is (25±3)℃, and the humidity is (40±5)%. Form the waterproof fabric layer on the polyester.

[0102] Forming of the waterproof coating: Mix 3kg stearic acid, 97kg waterborne polyurethane, 1kg crosslinking agent and 0.2kg defoamer evenly, and sonicate for 30 minutes to obtain a waterproof coating. Apply the waterproof coating to the waterproof fabric layer and cure to obtain the waterproof coating layer.

[0103] Garment making: Polyester with a waterproof coating and waterproof fabric layer is heat-fused to a biodegradable base layer, and then cut and spliced ​​to make a waterproof isolation garment.

[0104] In this embodiment, the average particle size of the fumed nano-silica is 40 nm, the degree of polymerization of polyvinyl alcohol is 1700 and the degree of alcoholysis is 88%, the waterborne polyurethane is an anionic waterborne polyurethane with a solid content of 40% and a pH of 7-9, the crosslinking agent is aziridine crosslinking agent, the defoamer is a polyether-modified organosilicon defoamer, and the biodegradable base layer is polylactic acid fabric.

[0105] Example 12

[0106] Example 12 provides a waterproof isolation gown, the preparation process of which is as follows:

[0107] Forming of the waterproof fabric layer: Take 10 kg of polyvinyl alcohol and 90 kg of water, mix and stir until the polyvinyl alcohol dissolves to obtain a polyvinyl alcohol solution. Take 5 kg of ethanol, 1 kg of fumed nano silica and 0.5 kg of magnesium aluminum hydrotalcite, mix and stir, and add to the polyvinyl alcohol aqueous solution. Stir and sonicate for 1 h to obtain a spinning agent. Attach polyester as a substrate to the roller of the receiver and use an electrospinning device for spinning. During the spinning process, the spinning voltage is set to 12 kV, the spinning speed is 0.5 ml / L, the distance between the spinneret and the collector is 13 cm, the temperature is (25±3)℃, and the humidity is (40±5)%. Form the waterproof fabric layer on the polyester.

[0108] Forming of the waterproof coating: Mix 3kg stearic acid, 97kg waterborne polyurethane, 1kg crosslinking agent and 0.2kg defoamer evenly, and sonicate for 30 minutes to obtain a waterproof coating. Apply the waterproof coating to the waterproof fabric layer and cure to obtain the waterproof coating layer.

[0109] Garment making: Polyester with a waterproof coating and waterproof fabric layer is heat-fused to a biodegradable base layer, and then cut and spliced ​​to make a waterproof isolation garment.

[0110] In this embodiment, the average particle size of the fumed nano-silica is 40 nm, the degree of polymerization of polyvinyl alcohol is 1700 and the degree of alcoholysis is 88%, the waterborne polyurethane is an anionic waterborne polyurethane with a solid content of 40% and a pH of 7-9, the crosslinking agent is aziridine crosslinking agent, the defoamer is a polyether-modified organosilicon defoamer, and the biodegradable base layer is polylactic acid fabric.

[0111] Example 13

[0112] Example 13 provides a waterproof isolation gown, the preparation process of which is as follows:

[0113] Forming of the waterproof fabric layer: Take 10 kg of polyvinyl alcohol and 90 kg of water, mix and stir until the polyvinyl alcohol dissolves to obtain a polyvinyl alcohol solution. Take 5 kg of ethanol, 1 kg of fumed nano silica and 0.5 kg of magnesium aluminum hydrotalcite, mix and stir, and add to the polyvinyl alcohol aqueous solution. Stir and sonicate for 2 hours to obtain a spinning agent. Attach polyester as a substrate to the roller of the receiver and use an electrospinning device for spinning. During the spinning process, the spinning voltage is set to 12 kV, the spinning speed is 0.5 ml / L, the distance between the spinneret and the collector is 13 cm, the temperature is (25±3)℃, and the humidity is (40±5)%. Form the waterproof fabric layer on the polyester.

[0114] Forming of the waterproof coating: Mix 3kg stearic acid, 97kg waterborne polyurethane, 1kg crosslinking agent and 0.2kg defoamer evenly, and sonicate for 30 minutes to obtain a waterproof coating. Apply the waterproof coating to the waterproof fabric layer and cure to obtain the waterproof coating layer.

[0115] Garment making: Polyester with a waterproof coating and waterproof fabric layer is heat-fused to a biodegradable base layer, and then cut and spliced ​​to make a waterproof isolation garment.

[0116] In this embodiment, the average particle size of the fumed nano-silica is 40 nm, the degree of polymerization of polyvinyl alcohol is 1700 and the degree of alcoholysis is 88%, the waterborne polyurethane is an anionic waterborne polyurethane with a solid content of 40% and a pH of 7-9, the crosslinking agent is aziridine crosslinking agent, the defoamer is a polyether-modified organosilicon defoamer, and the biodegradable base layer is polylactic acid fabric.

[0117] Example 14

[0118] Example 14 provides a waterproof isolation gown, the preparation process of which is as follows:

[0119] Forming of the waterproof fabric layer: Take 10 kg of polyvinyl alcohol and 90 kg of water, mix and stir until the polyvinyl alcohol dissolves to obtain a polyvinyl alcohol solution. Take 5 kg of ethanol, 1 kg of fumed nano silica and 0.5 kg of magnesium aluminum hydrotalcite, mix and stir, and add to the polyvinyl alcohol aqueous solution. Stir and sonicate for 1 h to obtain a spinning agent. Attach polyester as a substrate to the roller of the receiver and use an electrospinning device for spinning. During the spinning process, the spinning voltage is set to 12 kV, the spinning speed is 0.5 ml / L, the distance between the spinneret and the collector is 13 cm, the temperature is (25±3)℃, and the humidity is (40±5)%. Form a waterproof fabric layer on the polyester. Heat-melt bond the polyester with the formed waterproof fabric layer to the biodegradable base layer, and then form a waterproof coating.

[0120] Forming of the waterproof coating: Mix 3kg stearic acid, 97kg waterborne polyurethane, 1kg crosslinking agent and 0.2kg defoamer evenly, and sonicate for 30 minutes to obtain a waterproof coating. Apply the waterproof coating to the surface of the waterproof fabric layer away from the biodegradable substrate, and cure to obtain a waterproof coating.

[0121] Garment making: The biodegradable base layer with a waterproof coating and waterproof fabric layer is cut and spliced ​​to make a waterproof isolation garment.

[0122] In this embodiment, the average particle size of the fumed nano-silica is 40 nm, the degree of polymerization of polyvinyl alcohol is 1700 and the degree of alcoholysis is 88%, the waterborne polyurethane is an anionic waterborne polyurethane with a solid content of 40% and a pH of 7-9, the crosslinking agent is aziridine crosslinking agent, the defoamer is a polyether-modified organosilicon defoamer, and the biodegradable base layer is polylactic acid fabric.

[0123] Comparative Example 1

[0124] Comparative Example 1 provides a manufacturing process for a waterproof isolation garment. The difference between Comparative Example 1 and Example 2 is that Comparative Example 1 does not add fumed nano-silica and magnesium aluminum hydrotalcite when molding the waterproof fabric layer.

[0125] Comparative Example 2

[0126] Comparative Example 2 provides a preparation process for a waterproof isolation garment. The difference between Comparative Example 2 and Example 2 is that Comparative Example 1 does not add fumed nano-silica when molding the waterproof fabric layer, and the amount of magnesium aluminum hydrotalcite added is 1.5 kg.

[0127] Comparative Example 3

[0128] Comparative Example 3 provides a preparation process for a waterproof isolation garment. The difference between Comparative Example 3 and Example 2 is that: in Comparative Example 1, magnesium aluminum hydrotalcite is not added when forming the waterproof fabric layer, and the amount of fumed nano silica added is 1.5 kg.

[0129] Comparative Example 4

[0130] Comparative Example 4 provides a manufacturing process for a waterproof isolation gown. The difference between Comparative Example 4 and Example 2 is that Comparative Example 1 does not add stearic acid when forming the waterproof coating.

[0131] Testing and Inspection

[0132] The waterproof isolation gowns prepared according to Examples 1-14 and Comparative Examples 1-4 were subjected to the following tests:

[0133] (1) Test the hydrostatic pressure (kPa) of the waterproof isolation gown according to GB / T 4744-1887.

[0134] (2) Test the air permeability (mm / s) of the waterproof isolation gown according to GB / T 5453-1997.

[0135] The test data are shown in Table 1.

[0136] Table 1: Breathability and Waterproofing of Waterproof Isolation Gowns

[0137]

[0138]

[0139] The following detailed description of this application is based on the experimental data provided in Table 1.

[0140] The hydrostatic pressure of the waterproof isolation garments prepared in Examples 1-3 reached over 50 kPa and the breathability exceeded 11 mm / s, indicating that the waterproof isolation garments in Examples 1-3 have both good waterproof performance and good breathability.

[0141] Using Example 2 as a control, Examples 4 and 5 investigated the effect of the ratio of fumed silica and magnesium aluminum hydrotalcite to ethanol on the waterproofness and breathability of the prepared waterproof isolation garment. The waterproof isolation garment prepared using Example 2 showed greater breathability and hydrostatic pressure than those prepared using Examples 4 and 5, indicating that controlling the weight ratio of fumed silica and magnesium aluminum hydrotalcite to ethanol to 1:0.5:5 resulted in a waterproof isolation garment with good waterproofness and breathability.

[0142] Using Example 2 as a control, Examples 6 and 7 investigated the effect of the ratio of fumed silica to magnesium aluminum hydrotalcite on the waterproofness and breathability of the prepared waterproof isolation garments. The waterproof isolation garment prepared using Example 2 showed greater breathability and hydrostatic pressure than those prepared using Examples 6 and 7, indicating that the ratio of fumed silica to magnesium aluminum hydrotalcite affects the breathability and waterproofness of the prepared waterproof isolation garments.

[0143] Using Example 2 as a control, Examples 8 and 9 investigated the effect of stearic acid on the waterproofness and breathability of the prepared waterproof isolation garments. The waterproof isolation garment prepared using Example 2 showed greater breathability and hydrostatic pressure than those prepared using Examples 8 and 9, indicating that increasing the amount of stearic acid improved both the waterproofness and breathability of the garment. Furthermore, the breathability and hydrostatic pressure data for Example 9 were very similar to those for Example 2, possibly because the stearic acid had reached saturation. To reduce raw material costs, Example 2 was preferred.

[0144] Compared with Example 2, Example 10 investigated the effect of the substrate of the molded waterproof fabric layer on the waterproofness and breathability of the prepared waterproof isolation garment. The waterproof isolation garment prepared using Example 2 had greater breathability and hydrostatic pressure than the waterproof isolation garment prepared using Example 10. Therefore, using polyester as the substrate is better than using polypropylene nonwoven fabric as the substrate.

[0145] Compared with Example 2, Examples 11-13 investigated the effects of the mixing order and ultrasonic duration on the waterproofness and breathability of the prepared waterproof isolation garments. The waterproof isolation garments prepared using Examples 11-13 showed higher hydrostatic pressure and breathability than those prepared using Example 2, indicating that wetting the fumed silica and magnesium aluminum hydrotalcite with ethanol before mixing with the polyvinyl alcohol solution during the waterproof fabric layer preparation process improves the waterproofness and breathability of the prepared garments. Conversely, the waterproof isolation garment prepared using Example 12 showed higher hydrostatic pressure and breathability than those prepared using Examples 11 and 13, indicating that an appropriate ultrasonic duration improves the waterproofness and breathability of the prepared garments.

[0146] Compared with Example 11, Example 14 investigated the effect of the timing of forming the waterproof coating on the waterproofness and breathability of the resulting waterproof isolation garment. The waterproof isolation garment prepared using Example 14 had higher breathability and hydrostatic pressure than the waterproof isolation garment prepared using Example 11, indicating that first hot-melt bonding the substrate with the formed waterproof fabric layer to the biodegradable base layer before forming the waterproof coating is beneficial to improving the waterproofness and breathability of the resulting waterproof isolation garment.

[0147] Using Example 2 as a control, Comparative Examples 1-3 investigated the effects of the presence or absence of fumed silica and magnesium aluminum hydrotalcite on the waterproofness and breathability of the prepared waterproof isolation garments. The waterproof isolation garment prepared using Example 2 had significantly higher breathability and hydrostatic pressure than those prepared using Comparative Examples 1-3. This indicates that the simultaneous use of magnesium aluminum hydrotalcite and fumed silica produces a synergistic effect, greatly improving the waterproofness and breathability of the prepared waterproof isolation garments. It is speculated that this is because the layered structure of montmorillonite and the nanoparticle structure of fumed silica form breathable channels between the fiber pores, improving breathability and reducing the surface energy of the protective clothing surface, thereby reducing the probability of external water droplets adhering to and penetrating the isolation garment, and improving waterproofness.

[0148] Compared with Example 2, Comparative Example 4 investigated the effect of the presence or absence of stearic acid on the waterproofness and breathability of the prepared waterproof isolation garment. The hydrostatic pressure of the waterproof isolation garment prepared using Example 2 was much greater than that of the waterproof isolation garment prepared using Comparative Example 4, while the breathability of the waterproof isolation garment prepared using Example 2 was slightly greater than that of the waterproof isolation garment prepared using Comparative Example 4. This indicates that stearic acid helps to improve the waterproofness and breathability of the prepared waterproof isolation garment. It is speculated that this is because the stearic acid in the waterproof coating penetrates into the waterproof fabric layer during coating, allowing the stearic acid to combine with the hydroxyl groups on polyvinyl alcohol, thereby improving the waterproofness of polyvinyl alcohol.

[0149] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A waterproof barrier cloth characterized by: The waterproof isolation clothes comprises a degradable base layer, a waterproof fabric layer and a waterproof coating layer, and the preparation of the waterproof isolation clothes comprises the following steps: sequentially forming the waterproof fabric layer and the waterproof coating layer on the degradable base layer, cutting and splicing to obtain the waterproof isolation clothes; the waterproof fabric layer is prepared from the following raw materials by weight: Polyvinyl alcohol: 8-12 parts; Solvent: 93-97 parts; Fumed nano-silica: 0.5-1.4 parts; Mg-Al hydrotalcite: 0.1-1 part; The waterproof coating layer is prepared from the following raw materials by weight: Water-based polyurethane: 95-100 parts; Stearic acid: 2-4 parts; Crosslinking agent: 0.9-1.1 parts; Defoaming agent: 0.1-0.3 parts; The solvent is composed of 88-92 parts by weight of water and 3-7 parts by weight of ethanol; The waterproof fabric layer is prepared by the following steps: mixing and stirring polyvinyl alcohol, fumed nano-silica, Mg-Al hydrotalcite and solvent until the polyvinyl alcohol is dissolved, ultrasonic treatment to obtain a spinning agent, and electrospinning on a substrate using the spinning agent to form a waterproof fabric layer on the substrate; the substrate is polyester or polypropylene non-woven fabric.

2. A waterproof coverall according to claim 1, characterised in that: The ratio of the sum of the weight parts of the fumed nano-silica and the Mg-Al hydrotalcite to the weight parts of the ethanol is 3: (6-14).

3. The waterproof coverall of claim 1, wherein: The spinning agent is prepared by the following steps: mixing and stirring polyvinyl alcohol and water to obtain a polyvinyl alcohol solution, mixing and stirring ethanol, fumed nano-silica and Mg-Al hydrotalcite, then mixing with the polyvinyl alcohol solution, and then ultrasonic treatment.

4. The waterproof coverall of claim 1, wherein: The ultrasonic treatment time is 0.5-2 hours.

5. The waterproof coverall of claim 1, wherein: The sequentially forming the waterproof fabric layer and the waterproof coating layer on the degradable base layer comprises the following steps: forming the waterproof fabric layer on a substrate, then hot-melt bonding the substrate with the degradable base layer, and forming the waterproof coating layer on the side of the waterproof fabric layer away from the degradable base layer.

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