Anti-static polyester textile fabric and preparation method thereof

Abstract

The invention discloses an anti-static polyester textile fabric and a preparation method thereof, and relates to the technical field of polyester textile fabrics, the anti-static polyester textile fabric comprises a bottom layer, the upper surface of the bottom layer is provided with an inner layer for performing anti-static treatment on the fabric, and the outer side of the inner layer is provided with an outer layer for improving the waterproof performance of the fabric. According to the anti-static polyester textile fabric and the preparation method thereof, the carbon nanotubes are embedded into the inner layer to form a three-dimensional conductive network, the static charge dissipation efficiency is improved, meanwhile, the construction of an intelligent conductive network is realized through a core-shell structure by a carbon nanotube microcapsule technology, a microcapsule shell is made of a polylactic acid material, and the electrostatic charge dissipation efficiency is improved. Polylactic acid is subjected to ring opening polymerization to form a compact shell, the problem of dispersity of the carbon nanotubes in a polyester matrix is solved, the microcapsule shell is kept complete in a normal temperature state, the carbon nanotubes are isolated by the polylactic acid shell, daily friction damage is avoided, and when the environment temperature exceeds 35 DEG C, the polylactic acid shell is softened and broken, so that the performance of the carbon nanotubes is improved. And releasing the carbon nanotubes to form a three-dimensional conductive network.

Description

Technical Field

[0001] The present invention relates to the technical field of polyester textile fabrics, and specifically relates to an anti-static polyester textile fabric and a preparation method thereof. Background Art

[0002] Polyester textile fabric is a kind of polyester fiber fabric synthesized from petrochemical products. It is made by the melt spinning method and has thermoplasticity, and can be reheated and reshaped repeatedly. Polyester fabrics are widely used in many fields due to their high strength, wrinkle resistance and easy care characteristics.

[0003] Prior Art One (a Chinese patent with the publication number CN213972944U and the publication date August 17, 2021) an antibacterial polyester fabric, including a fabric body, the fabric body from top to bottom is successively composed of a wear-resistant layer, a breathable layer, a polyester fabric layer, an antibacterial layer, and a sweat-absorbing layer, and the wear-resistant layer, the breathable layer, the polyester fabric layer, the antibacterial layer, and the sweat-absorbing layer are all fixedly bonded through a hot melt adhesive dot film layer. The polyester fabric layer is woven by interlacing polyester warp yarns and polyester weft yarns, and ventilation holes are provided at the intersections of the polyester warp yarns and polyester weft yarns. A mildew-proof layer is provided on the top of the sweat-absorbing layer, and a lining layer is provided on the top of the sweat-absorbing layer. A plurality of ventilation holes are opened in the fabric to increase the air permeability of the fabric and make people more comfortable when using it. At the same time, the sweat-absorbing layer can absorb moisture and strengthen the function of discharging moisture and sweating, so that people feel comfortable. At the same time, the mildew-proof layer and the antibacterial layer can effectively prevent mildew and the growth of bacteria in the fabric. And Prior Art Two (a Chinese patent with the publication number CN217944586U and the publication date December 2, 2022) a composite flame-retardant polyester textile fabric, including a fabric main body, the fabric main body includes a base fabric, flame-retardant layers are fixedly connected to both the upper surface and the bottom surface of the base fabric, an insulating layer is fixedly connected to the upper surface of the flame-retardant layer located on the upper surface of the base fabric, and a skin-friendly layer is connected to the bottom surface of the flame-retardant layer located on the bottom surface of the base fabric. This new type of composite flame-retardant polyester textile fabric has a flame-retardant effect by fixedly connecting flame-retardant layers to both the upper surface and the bottom surface of the base fabric, reducing the possibility of burns. The insulating layer blocks heat and reduces the possibility of burns. The skin-friendly layer can increase the wearing comfort.

[0004] Although the fabrics in the prior art can increase the comfort of the user when wearing, the static electricity problem of the polyester textile fabric itself is relatively large. When the user wears work clothes made of polyester textile fabric to work in flammable and explosive industries such as petroleum, chemical industry, and coal mines, there are certain safety hazards.

[0005] Therefore, we propose an anti-static polyester textile fabric and a preparation method thereof to solve the problems mentioned above. Summary of the Invention

[0006] The object of the present invention is to provide an antistatic polyester textile fabric and a preparation method thereof, so as to solve the problem of large static electricity of the polyester textile fabric itself in the current market. When the user wears work clothes made of polyester textile fabric to work in flammable and explosive industries such as petroleum, chemical industry, and coal mines, there are certain potential safety hazards.

[0007] To achieve the above object, the present invention provides the following technical solution: an antistatic polyester textile fabric and a preparation method thereof, including a bottom layer, on the upper surface of the bottom layer, there is an inner layer for antistatic treatment of the fabric itself, and on the outer side of the inner layer, there is an outer layer for improving the waterproof performance of the fabric itself.

[0008] Preferably, the bottom layer is a polyester fabric base woven from polyester filaments, and plush bumps are sewn on the lower surface of the bottom layer.

[0009] Preferably, the plush bumps are evenly distributed on the lower surface of the bottom layer. Through the plush bumps, the direct contact area between the bottom layer and the skin can be reduced, and the plush bumps are made of cotton material.

[0010] Preferably, metal wires are arranged at equal intervals between the outer layer and the inner layer, and between the inner layer and the bottom layer. And connecting wires are arranged through the outer layer, the inner layer and the bottom layer, and the connecting wires are wound around the outside of the metal wires.

[0011] Preferably, the metal wires are fixed to the three-layer fabrics through the connecting wires, and hot melt adhesive points are arranged between the outer layer and the inner layer, and between the inner layer and the bottom layer. And the hot melt adhesive points are made of PU material. At the same time, the hot melt adhesive points are circular dot-shaped structures and are arranged in a rectangular array between the three groups of layers.

[0012] Preferably, the inner layer is woven from copper-plated polyester yarn, and embedding grooves are opened on both the front and back sides of the inner layer, and the embedding grooves on both sides are communicated through the side edges of the inner layer.

[0013] Preferably, carbon nanotubes are embedded in the embedding grooves, and a microcapsule shell for reducing the dispersion of carbon nanotubes in the inner layer is encapsulated on the outer side of the carbon nanotubes, and the microcapsule shell is made of polylactic acid material.

[0014] Preferably, the outer layer is woven from graphene limit and polyester fiber together, and a PTFE film for enhancing the waterproof performance of the fabric is coated on the outer side of the outer layer.

[0015] A preparation method of an antistatic polyester textile fabric includes the following steps: S1. Fiber modification stage: Add 3%-5% of graphene conductive material to the polyester chips, and use the melt spinning technology to make the polyester chips into polyester fibers with preliminary antistatic effect. At the same time, set the spinning temperature between 265~280°C, and the draw ratio of the fibers is 3.5~4.2; Limited weaving stage: Embed copper fiber wires and polyester fibers at intervals of 5~10 mm in the warp and weft yarns to form a conductive network through warp / weft inlay weaving. At the same time, make the surface layer of the fabric be a wire limiting wire with graphene, and sew plush bumps made of cotton material at the bottom layer of the fabric. At the same time, during the weaving process, use a water jet loom that can avoid static interference, and adjust the yarn tension ≤5 cN; S2. Antistatic agent padding: Mix polyether ester antistatic agent (20 g / L) and crosslinking agent (5 g / L), and carry out antistatic agent padding on the woven fabric. The specific steps are padding rate 70% → pre-drying (100°C × 2 min) → curing (150°C × 1 min). At the same time, scrape the PU dispersion on the woven fabric and dry the fabric (120°C × 3 min); S3. Hot melt adhesive dots: Further connect multiple layers of fabrics through hot melt adhesive dots. The diameter of the PU adhesive dots is 0.3~0.5 mm, and the spacing is 1~2 mm and set between the fabrics to bond the fabrics. Only locally fix through dot matrix adhesion, retain the exposed conductive area, and distribute the tiny adhesive dots at high density to balance strength and conductivity. The elastic PU adhesive dots buffer stress and protect the conductive network; Carbon nanotubes: Improve the embedding of carbon nanotubes into the pores of polyester fibers through ultrasonic assistance to ensure the uniform embedding of the conductive network into the inner layer, form a three-dimensional conductive network, and improve the static charge dissipation efficiency. At the same time, encapsulate the carbon nanotubes through microcapsule technology to form a microcapsule shell on the outside of the carbon nanotubes. Use polylactic acid (PLA) to form a dense shell through ring-opening polymerization to solve the dispersion problem of carbon nanotubes in the polyester matrix. At room temperature, the microcapsule shell remains intact, and the carbon nanotubes are isolated by the polylactic acid shell to avoid daily friction damage. When the environmental temperature exceeds 35°C, the polylactic acid shell softens and breaks, releasing carbon nanotubes to form a three-dimensional conductive network, and the static half-life is shortened from 8 seconds to 0.5 seconds.

[0016] Compared with the prior art, the beneficial effects of the present invention are: The fabric is divided into three layers: the outer layer, the inner layer, and the bottom layer. At the same time, the inner layer is woven from copper-plated polyester yarn, and the outer layer is woven from graphene limiting and polyester fibers together. The three-layer setting makes the fabric form a sandwich structure. Through the mutual cooperation between the copper fiber wires and graphene, the antistatic effect of the fabric can be improved.

[0017] A wire is provided between the surface layers, through which multiple groups of surface layers can be reinforced to improve the toughness of the fabric. At the same time, a connecting wire passing through each surface layer is used to reinforce the wire to prevent the wire from separating from each surface layer.

[0018] The multi-layer fabric is fixed by hot melt adhesive dots, so that the dot matrix adhesive only fixes the fabric locally, leaving the exposed conductive area, avoiding the problem that the continuous adhesive film completely isolates the conductive material and the conductive path is covered by the adhesive film. The tiny adhesive dots are distributed densely, thus balancing strength and conductivity, avoiding the problem that high bonding strength requires a thick adhesive layer and sacrificing conductivity, and making the bonding strength and conductivity contradictory. At the same time, the elastic PU adhesive dots buffer stress, can protect the conductive network, prevent the rigid bonding layer from easily causing stress concentration of fibers, and prevent the phenomenon that the conductive fibers break due to the interlayer displacement between the surface layers.

[0019] Carbon nanotubes are embedded in the inner layer to form a three-dimensional conductive network, improving the static charge dissipation efficiency. At the same time, the carbon nanotube microcapsule technology realizes the construction of an intelligent conductive network through a core-shell structure. The microcapsule shell is made of polylactic acid. Through ring-opening polymerization of polylactic acid, a dense shell is formed to solve the dispersion problem of carbon nanotubes in the polyester matrix. At room temperature, the microcapsule shell remains intact, and the carbon nanotubes are isolated by the polylactic acid shell to avoid daily friction damage. When the environmental temperature exceeds 35 °C, the polylactic acid shell softens and breaks, releasing carbon nanotubes to form a three-dimensional conductive network. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional structure schematic diagram of the fabric of the present invention; Figure 2 It is a developed structure schematic diagram of the fabric of the present invention; Figure 3 It is a three-dimensional structure schematic diagram of the connecting wire of the present invention; Figure 4 For the present invention Figure 3 The enlarged structure schematic diagram at A in; Figure 5 It is a three-dimensional structure schematic diagram of the hot melt adhesive dots of the present invention; Figure 6 It is a three-dimensional structure schematic diagram of the inner layer of the present invention; Figure 7 It is a three-dimensional structure schematic diagram of the microcapsule shell of the present invention; Figure 8 It is a three-dimensional sectional structure schematic diagram of the inner layer of the present invention; Figure 9 For the present invention Figure 8 The enlarged structure schematic diagram at B in.

[0021] In the figure: 1. Outer layer; 2. Inner layer; 3. Bottom layer; 4. Connecting wire; 5. Metal wire; 6. Hot melt glue dots; 7. Plush bumps; 8. Embedding groove; 9. Microcapsule shell; 10. Carbon nanotubes. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Embodiment 1: Figures 1 - 5 The technical solution shown in the figure, the present invention provides the following technical solution: an antistatic polyester textile fabric and a preparation method thereof, disclosing a three-layer fabric of an outer layer 1, an inner layer 2 and a bottom layer 3, wherein the three-layer fabric arranged in a sandwich structure can improve the antistatic effect of the fabric: The upper surface of the bottom layer 3 is provided with an inner layer 2 which is the same as the antistatic treatment of the fabric itself, and the outer side of the inner layer 2 is provided with an outer layer 1 which improves the waterproof performance of the fabric itself. The bottom layer 3 is a polyester cloth base woven from polyester filaments, and the lower surface of the bottom layer 3 is sewn with plush convex dots 7, and the plush convex dots 7 are evenly spaced and arranged on the lower surface of the bottom layer 3. The direct contact area between the bottom layer 3 and the skin can be reduced by the plush convex dots 7, and the plush convex dots 7 are made of cotton material. Metal wires 5 are evenly spaced and arranged between the outer layer 1 and the inner layer 2, and between the inner layer 2 and the bottom layer 3, and connecting wires 4 are penetrated through the outer layer 1, the inner layer 2 and the bottom layer 3, and the connecting wires 4 are wound around the outside of the metal wires 5, and the metal wires 5 are fixed to the three layers of fabric through the connecting wires 4. The inner layer 2 is woven from copper-plated polyester yarn, the outer layer 1 is woven from graphene limiters and polyester fibers, and the outer side of the outer layer 1 is coated with a PTFE film which enhances the waterproof performance of the fabric.

[0024] The fabric is divided into three layers, namely, an outer layer 1, an inner layer 2 and a bottom layer 3. The inner layer 2 is woven from copper-plated polyester yarn, and the outer layer 1 is woven from graphene limiters and polyester fibers. The three-layer arrangement makes the fabric form a sandwich structure. The antistatic effect of the fabric can be improved by the cooperation between the copper fiber yarns and the graphene. Metal wires 5 are arranged between the surface layers, and multiple groups of surface layers can be reinforced by the metal wires 5 to improve the toughness of the fabric. At the same time, the metal wires 5 are reinforced by connecting lines 4 running through the surface layers to prevent separation of the metal wires 5 from the surface layers.

[0025] Embodiment 2: Figure 2 , Figure 3 and Figure 5For the technical solution shown, the present invention provides the following technical solution: an anti-static polyester textile fabric and a preparation method thereof, discloses hot melt adhesive points 6, through which the shielding conductive path can be avoided: hot melt adhesive points 6 are provided between the outer layer 1 and the inner layer 2, and between the inner layer 2 and the bottom layer 3, and the hot melt adhesive points 6 are made of PU material. At the same time, the hot melt adhesive points 6 are circular dot-shaped structures and are arranged in a rectangular array between the three groups of layers.

[0026] The multi-layer fabric is fixed through the hot melt adhesive points 6, so that the dot matrix adhesion only fixes the fabric locally, leaving the exposed conductive area, avoiding the problem that the continuous adhesive film completely isolates the conductive material and the conductive path is covered by the adhesive film. The tiny adhesive points are distributed at a high density, thus balancing strength and conductivity, avoiding the problem that a high bonding strength requires a thick adhesive layer and sacrificing conductivity, and making the bonding strength and conductivity contradictory. At the same time, the elastic PU adhesive points buffer stress, can protect the conductive network, prevent the rigid bonding layer from easily causing stress concentration of the fibers, and prevent the phenomenon that the interlayer displacement between the surface layers causes the conductive fibers to break.

[0027] Example three: As Figure 1 、 Figure 2 、 Figures 6 - 9 For the technical solution shown, the present invention provides the following technical solution: an anti-static polyester textile fabric and a preparation method thereof, discloses carbon nanotubes 10 and microcapsule shells 9, through which the carbon nanotubes 10 can be released when the temperature rises, thereby improving the static charge dissipation efficiency of the fabric: Embedding grooves 8 are provided on both the front and back sides of the inner layer 2, and the embedding grooves 8 on both the front and back sides are connected through the side edges of the inner layer 2. Carbon nanotubes 10 are embedded in the embedding grooves 8, and a microcapsule shell 9 for reducing the dispersion of the carbon nanotubes 10 in the inner layer 2 is encapsulated on the outer side of the carbon nanotubes 10, and the microcapsule shell 9 is made of polylactic acid material.

[0028] The carbon nanotubes 10 are embedded in the inner layer 2 to form a three-dimensional conductive network, improving the static charge dissipation efficiency. At the same time, the carbon nanotube microcapsule technology realizes the construction of an intelligent conductive network through a core-shell structure. The microcapsule shell 9 is made of polylactic acid PLA material. The polylactic acid PLA forms a dense shell through ring-opening polymerization, solving the dispersion problem of the carbon nanotubes 10 in the polyester matrix. At room temperature, the microcapsule shell 9 remains intact, and the carbon nanotubes 10 are isolated by the polylactic acid shell, avoiding daily friction damage. When the environmental temperature exceeds 35 °C, the polylactic acid shell softens and breaks, releasing the carbon nanotubes 10 to form a three-dimensional conductive network.

[0029] A preparation method of an anti-static polyester textile fabric includes the following steps: S1. Fiber modification stage: Add 3%-5% of graphene conductive material to the polyester chips, and use the melt spinning technology to make the polyester chips into polyester fibers with preliminary antistatic effect. At the same time, set the spinning temperature between 265~280°C, and the draw ratio of the fibers is 3.5~4.2; Limited weaving stage: Embed copper fiber wires and polyester fibers at intervals of 5~10 mm in the warp and weft yarns, and form a conductive network through warp / weft inlay weaving. At the same time, make the surface layer of the fabric be the wire limiting filaments with graphene, and stitch 7 cotton plush bumps at the bottom layer 3 of the fabric. At the same time, during the weaving process, use a water jet loom that can avoid static interference, and adjust the yarn tension ≤5 cN; S2. Antistatic agent padding: Mix the polyether ester antistatic agent (20 g / L) and the crosslinking agent (5 g / L), and perform antistatic agent padding on the woven fabric. The specific steps are padding rate 70% → pre-drying (100°C × 2 min) → curing (150°C × 1 min). At the same time, scrape the PU dispersion on the woven fabric, and dry the fabric (120°C × 3 min); S3. Hot melt adhesive dots 6: Further connect multiple layers of fabrics through the hot melt adhesive dots 6. The diameter of the PU adhesive dots is 0.3~0.5 mm, and the spacing is set at 1~2 mm between the fabrics, so as to bond the fabrics. Only locally fix through dot matrix adhesion, retain the exposed conductive area, distribute the tiny adhesive dots at high density, balance strength and conductivity, and use elastic PU adhesive dots to buffer stress and protect the conductive network; Carbon nanotubes 10: Improve the carbon nanotubes 10 and embed them into the pores of the polyester fibers through ultrasonic assistance to ensure the uniform embedding of the conductive network into the inner layer 2, form a three-dimensional conductive network, and improve the static charge dissipation efficiency. At the same time, encapsulate the carbon nanotubes 10 through the microcapsule technology, so that a microcapsule shell 9 is formed on the outside of the carbon nanotubes 10. Use polylactic acid (PLA) to form a dense shell through ring-opening polymerization to solve the dispersion problem of the carbon nanotubes 10 in the polyester matrix. At room temperature, the microcapsule shell 9 remains intact, and the carbon nanotubes 10 are isolated by the polylactic acid shell to avoid daily friction damage. When the environmental temperature exceeds 35°C, the polylactic acid shell softens and breaks, releasing the carbon nanotubes 10 to form a three-dimensional conductive network, and the static half-life is shortened from 8 seconds to 0.5 seconds.

[0030] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An antistatic polyester textile fabric, comprising a bottom layer (3), characterized in that: The upper surface of the bottom layer (3) is provided with an inner layer (2) which is similar to the antistatic treatment of the fabric itself, and the outer side of the inner layer (2) is provided with an outer layer (1) which improves the waterproof performance of the fabric itself; The bottom layer (3) is a polyester cloth base layer woven from polyester filaments, and the lower surface of the bottom layer (3) is sewn with plush protrusions (7); The plush convex points (7) are arranged at equal intervals on the lower surface of the bottom layer (3); the plush convex points (7) can reduce the direct contact area between the bottom layer (3) and the skin, and the plush convex points (7) are made of cotton; Metal wires (5) are arranged at equal intervals between the outer layer (1) and the inner layer (2), and between the inner layer (2) and the bottom layer (3), and connecting wires (4) are arranged through the outer layer (1), the inner layer (2) and the bottom layer (3), and the connecting wires (4) are wound around the outside of the metal wires (5); The metal wire (5) is fixed to the three layers of fabric via a connecting line (4), and hot melt adhesive dots (6) are arranged between the outer layer (1) and the inner layer (2), and between the inner layer (2) and the bottom layer (3), and the hot melt adhesive dots (6) are made of PU material. The hot melt adhesive dots (6) are circular dot-shaped structures and are distributed in a rectangular array between the three groups of layers.

2. The antistatic polyester textile fabric according to claim 1, characterized in that: The inner layer (2) is woven from copper-plated polyester yarn, and embedding grooves (8) are provided on both the front and back sides of the inner layer (2), and the embedding grooves (8) on the front and back sides are connected through the sides of the inner layer (2).

3. The antistatic polyester textile fabric according to claim 2, characterized in that: The embedding groove (8) has a carbon nanotube (10) embedded therein, and the outer side of the carbon nanotube (10) is encapsulated with a microcapsule shell (9) for reducing the dispersion of the carbon nanotube (10) in the inner layer (2), and the microcapsule shell (9) is made of polylactic acid.

4. The antistatic polyester textile fabric according to claim 1, characterized in that: The outer layer (1) is woven from graphene fibers and polyester fibers, and the outer side of the outer layer (1) is coated with a PTFE film that enhances the waterproof performance of the fabric.

5. A preparation method, applied to the antistatic polyester textile fabric as claimed in claim 1, characterized in that: The steps include: S1, fiber modification stage: add 3%-5% graphene conductive material to polyester slices, and make polyester slices into polyester fibers with preliminary antistatic effect through melt spinning technology, and set the spinning temperature between 265~280℃, and the fiber stretching ratio is 3.5~4.2; Limiting weaving stage: copper fiber and polyester fiber are embedded into the warp and weft yarns at intervals of 5 to 10 mm, and a conductive network is formed by warp / weft weaving. At the same time, the surface layer of the fabric is a conductive wire limiting wire with graphene, and the bottom layer of the fabric (3) is sewn to set cotton material plush bumps (7). At the same time, during the weaving process, a water jet loom that can avoid electrostatic interference is used, and the yarn tension is adjusted to ≤5cN; S2. Antistatic agent padding: Mix the polyether ester antistatic agent (20g / L) + cross-linking agent (5g / L) and pad the woven fabric with the antistatic agent. The specific steps are: padding rate 70% → pre-baking (100℃×2min) → baking (150℃×1min), and at the same time, scrape the PU dispersion on the woven fabric, and dry the fabric (120℃×3min); S3, hot melt glue point (6): The multi-layer fabrics are further connected by hot melt glue point (6). The PU glue point has a diameter of 0.3-0.5 mm and a spacing of 1-2 mm between the fabrics, so as to bond the fabrics. The dot matrix glue is only used to fix the fabrics locally, leaving the exposed conductive area. The tiny glue points are densely distributed to balance strength and conductivity. The elastic PU glue points buffer stress and protect the conductive network. Carbon nanotubes (10): The carbon nanotubes (10) are embedded into the pores of polyester fibers with the assistance of ultrasound to ensure the uniformity of the conductive network embedded in the inner layer (2) to form a three-dimensional conductive network and improve the efficiency of static charge dissipation. At the same time, the carbon nanotubes (10) are encapsulated by microencapsulation technology to form a microcapsule shell (9) on the outside of the carbon nanotubes (10). Polylactic acid (PLA) is used to form a dense shell through ring-opening polymerization to solve the dispersion problem of the carbon nanotubes (10) in the polyester matrix. At room temperature, the microcapsule shell (9) remains intact and the carbon nanotubes (10) are isolated by the polylactic acid shell to avoid daily friction damage. When the ambient temperature exceeds 35°C, the polylactic acid shell softens and breaks, releasing the carbon nanotubes (10) to form a three-dimensional conductive network, and the static half-life is shortened from 8 seconds to 0.5 seconds.

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