Preparation Method of Protective Three-Dimensional Structured Hemostatic Textile Spacer Fabric

Abstract

This application relates to a preparation method of a protective three-dimensional structured hemostatic textile spacer fabric, and relates to the field of knitted medical dressings. In this application, the spacer dressing uses carboxymethyl-modified viscose filament-PTFE braided yarn as the skin contact material, and quickly stops bleeding through three methods: physical, chemical, and biological. The physical principle is to absorb blood to form a gel-like substance to block the wound. The chemical action concentrates the blood concentration to activate the coagulation system. The biological action releases negative ions to activate coagulation factors and initiate the endogenous coagulation system. Sodium carboxymethyl cellulose can be obtained by carboxymethylation modification of fibers, and PTFE plays a structural support role; Coolmax-nylon monofilament wrapping yarn with high water absorption and elastic recovery is used as the spacer filament; ultra-high molecular weight polyethylene fiber with superhydrophobicity is used as the outer surface material, and the surface structure is tight to play a barrier role; furthermore, a preparation method of a protective three-dimensional structured hemostatic textile spacer fabric is designed.

Description

Technical Field

[0001] The present application relates to the technical field of knitted medical dressings, and particularly relates to a preparation method of a protective three-dimensional structure hemostatic textile spacer fabric. Background Art

[0002] The skin is a barrier between the internal and external environments of the human body and is of great significance for maintaining the normal physiological functions of the body. However, after large-area skin injuries, it is generally difficult to heal spontaneously. Therefore, the emergence of skin dressings is crucial as they can accelerate wound healing. Skin dressings are divided into four categories: traditional, biological, synthetic, and composite. Traditional skin dressings are mainly made of cotton fabrics but are not easy to remove; biological skin dressings can be divided into protein-based, polysaccharide-based, etc. and have good biocompatibility; synthetic skin dressings are made of polymer materials synthesized by chemical or physical methods and are easy to manufacture; composite skin dressings include composites and composite membranes and have good protective effects.

[0003] However, composite dressings promote wound repair with the characteristics of an outer surface barrier and inner biocompatibility. They mostly use synthetic films such as silicone rubber, polyurethane, and polyvinyl alcohol to play a barrier protection role, and use biological dressings as the skin contact surface. In the textile field, spacer fabrics can also achieve composite dressings. Such spacer dressings mainly achieve physical and chemical hemostasis by absorbing a large amount of blood, using high-absorbency cotton, viscose, and tencel as spacer filaments, and hydrophobic yarns to weave the two surfaces. However, bacteria breed in the wet state of cellulose and need antibacterial treatment, and the prepared spacer fabric has poor mechanical properties because the spacer filaments are soft. Summary of the Invention

[0004] The purpose of the present application is to provide a preparation method of a protective three-dimensional structure hemostatic textile spacer fabric to solve the problems existing in the above-mentioned prior art.

[0005] To achieve the above purpose, the technical solution adopted by the present application is as follows:

[0006] A preparation method of a protective three-dimensional structure hemostatic textile spacer fabric, comprising:

[0007] S1. Using viscose filament as the skin yarn and PTFE sewing thread as the core yarn, weaving on a high-speed knitting machine. The skin yarn is installed on the spindle and rotated for weaving, and the core yarn is directly fed. After adjusting the knitting pitch of the skin yarn, a viscose filament - PTFE woven yarn is woven.

[0008] S2. Alkalizing, etherifying, acidifying, and drying the viscose filament - PTFE woven yarn in sequence to obtain a modified viscose filament - PTFE woven yarn.

[0009] S3. Use Coolmax as the skin yarn and polyamide monofilament as the core yarn, and perform wrapping on a high-speed knitting machine. The skin yarn is installed on the spindle and rotates for wrapping, and the core yarn is directly fed. After adjusting the knitting pitch of the skin yarn, Coolmax-polyamide monofilament wrapped yarn is knitted.

[0010] S4. Use the modified viscose filament-PTFE woven yarn as the inner and outer surface yarn, use the Coolmax-polyamide monofilament wrapped yarn as the spacer yarn, and use ultra-high molecular weight polyethylene as the outer surface yarn, and perform knitting on a flat knitting machine. After adjusting the number of needles spanned by the spacer yarn, a protective three-dimensional structure hemostatic textile spacer fabric is knitted.

[0011] In a possible implementation manner, in the step S1:

[0012] The specification of the viscose filament is 75D-600D, the number of spindles of the skin yarn is 4 or 8 or 16, and the mass ratio of the skin yarn in the viscose filament-PTFE woven yarn is 10%-90%;

[0013] The number of spindles of the skin yarn is an even number. Half of the spindles rotate clockwise and the other half rotate counterclockwise, and the spindles of the skin yarn form symmetric knitting;

[0014] The specification of the PTFE sewing thread is 200D-800D, and the number of core yarns is 1-4.

[0015] In a possible implementation manner, in the step S1:

[0016] The knitting pitch is 0.1mm-4mm;

[0017] The diameter of the viscose filament-PTFE woven yarn is 0.5mm-1.5cm.

[0018] In a possible implementation manner, in the step S2:

[0019] The lye used in the alkalization consists of NaOH and deionized water, the alkalization concentration is 22.5%-40%, the alkalization time is 5min-120min, and the alkalization temperature is 15°C-70°C.

[0020] In a possible implementation manner, in the step S2:

[0021] The etherifying agent used in the etherification consists of NaOH, deionized water, monochloroacetic acid and absolute ethanol, or consists of NaOH, deionized water, monochloroacetic acid and isopropanol;

[0022] The concentration of the NaOH is 10%-18%, the concentration of the monochloroacetic acid is 2.5%-12%, the etherification time is 0.5h-4h, and the etherification temperature is 55°C-80°C;

[0023] The acidifying reagent used in the acidification includes acetic acid or sulfuric acid.

[0024] In a possible implementation, in the step S3:

[0025] The specification of the Coolmax is 75D-150D, and the number of spindles of the skin yarn is an even number;

[0026] All the spindles of the skin yarn are wrapped clockwise or counterclockwise to form a co-directional wrap;

[0027] The diameter of the polyamide monofilament is 0.1mm-0.25mm, and the number of core yarns is 1-4.

[0028] In a possible implementation, in the step S3:

[0029] The knitting pitch is 0.5mm-2mm;

[0030] The diameter of the Coolmax-polyamide monofilament wrapped yarn is 0.2mm-1mm.

[0031] In a possible implementation, in the step S4:

[0032] 1-2 root(s) of the inner and outer yarns are fed in, 1-4 root(s) of the spacer yarns are fed in, and 2-8 root(s) of the outer yarns are fed in;

[0033] The specification of the ultra-high molecular weight polyethylene is 300D-600D, with 40-80 twists / m.

[0034] In a possible implementation, in the step S4:

[0035] The number of needles spanned by the spacer yarn is 2 or 4 or 6 or 8;

[0036] The stitch density value of the spacer yarn is 55-110.

[0037] In a possible implementation, in the step S4:

[0038] The basic unit in the surface structure of the protective three-dimensional structured hemostatic textile spacer fabric consists of six rows, and the surface structure includes an inner surface structure and an outer surface structure with consistent tissues;

[0039] The first row of the basic unit of the protective three-dimensional structured hemostatic textile spacer fabric is a full needle row. The second row is knitted at odd needle positions to achieve the effect of knitting with a one-needle spacing. The third row is still knitted at odd needle positions to achieve the effect of knitting with a one-needle spacing. The fourth row is a full needle row. The fifth row is knitted at even needle positions to achieve the effect of knitting with a one-needle spacing. The sixth row is still knitted at even needle positions to achieve the effect of knitting with a one-needle spacing;

[0040] The surface texture of the protective three-dimensional structured hemostatic textile spacer fabric repeats this basic unit according to the fabric size;

[0041] The surface texture density value of the protective three-dimensional structured hemostatic textile spacer fabric is 80 - 120.

[0042] The beneficial effects brought by the technical solution provided in this application at least include:

[0043] In the skin contact surface of this application, the skin yarn and core yarn of the carboxymethyl-modified viscose filament - PTFE braided yarn are braided together. However, after the skin yarn is dissolved, the core yarn structure remains intact, and the core yarn has good biocompatibility and high inertness, which is different from seaweed fiber - cotton blended yarn or chitosan - cotton blended yarn. Although the cotton yarn in the blended yarn also plays a role in structural support, it may lead to granulation tissue in the cotton yarn pores, causing secondary wound damage during replacement; The Coolmax - polyamide monofilament wrapped yarn spacer filaments provided in this application have rapid core absorption of Coolmax to accelerate hemostasis, and the polyamide monofilament provides elastic recovery and support. Different from the spacer filaments composed of pure highly absorbent cotton, viscose, and tencel, which can only absorb a large amount of blood, but the fabric structure is tight, the gram weight is large, and the spacer filaments have no elasticity. The hemostasis effect is good, but the protective effect is weak; The protective three-dimensional structured hemostatic textile spacer fabric provided in this application completes the basic surface structure through a row of full needles, and then increases the density by knitting with a one-needle spacing to prevent the spacer filaments from protruding from the surface pores. Different from increasing the machine number to improve the density, it enables a complete structure of the spacer fabric to be formed with relatively thick yarns; It meets the requirements of good biocompatibility and intact structure of the raw materials on the skin contact surface, good hygroscopicity and elastic recovery of the spacer filaments, and good hydrophobic protection on the outer surface, achieving rapid hemostasis and strengthening the protective effect on the wound. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The drawings are used to provide a further understanding of this application, and constitute a part of the specification. They are used together with the embodiments of this application to explain this application, and do not constitute a limitation to this application. In the drawings:

[0045] Figure 1 Shows a flowchart of the preparation method of the protective three-dimensional structured hemostatic textile spacer fabric provided by an exemplary embodiment of this application;

[0046] Figure 2Shows a schematic structural diagram of the knitting yarn of the preparation method of the protective three-dimensional structure hemostatic textile spacer fabric provided by an exemplary embodiment of the present application;

[0047] Figure 3 Shows a schematic structural diagram of the wrapping yarn of the preparation method of the protective three-dimensional structure hemostatic textile spacer fabric provided by an exemplary embodiment of the present application;

[0048] Figure 4 Shows a schematic structural diagram of the protective three-dimensional structure hemostatic textile spacer fabric of the preparation method of the protective three-dimensional structure hemostatic textile spacer fabric provided by an exemplary embodiment of the present application;

[0049] Figure 5 Shows a knitting schematic diagram of the preparation method of the protective three-dimensional structure hemostatic textile spacer fabric provided by an exemplary embodiment of the present application. Detailed implementation manners

[0050] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0051] Among them, the same components are denoted by the same reference numerals. It should be noted that the terms "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the accompanying drawings of the present application specification, and the terms "bottom surface" and "top surface", "inner" and "outer" respectively refer to facing or away from a specific component. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application specification, "a plurality of" means two or more.

[0052] Next, the present application will be further described in conjunction with the drawings and embodiments.

[0053] First, a brief introduction to the nouns involved in the embodiments of the present application:

[0054] PTFE, polytetrafluoroethylene (Poly tetra fluoroethylene, abbreviated as PTFE), commonly known as "the king of plastics", is a high molecular polymer obtained by polymerizing tetrafluoroethylene as a monomer, and its chemical formula is (C 2 F 4 ) n, It has excellent heat and cold resistance and can be used for a long time at -180 to 260 °C. This material has the characteristics of being resistant to acids, alkalis, and various organic solvents and is almost insoluble in all solvents. At the same time, polytetrafluoroethylene has the characteristic of high temperature resistance, and its coefficient of friction is extremely low.

[0055] Coolmax, Coolmax fiber with four grooves, can quickly drain the sweat generated during human activities to the surface of the clothing for evaporation, keep the skin fresh, and make the activities feel more comfortable. It has good moisture conductivity, and the knitted fabric interwoven with cotton fiber has good moisture conduction effect and is widely used for sewing T-shirts, sportswear, etc.

[0056] Figure 1 The flowchart of the preparation method of the protective three-dimensional structure hemostatic textile spacer fabric provided by an exemplary embodiment of the present application is shown. The method includes the following steps:

[0057] Step S1: Using viscose filament as the skin yarn and PTFE sewing thread as the core yarn, weaving on a high-speed knitting machine. The skin yarn is installed on the spindle and rotates for weaving, and the core yarn is directly fed. After adjusting the weaving pitch of the skin yarn, the viscose filament-PTFE woven yarn is woven.

[0058] In the embodiment of the present application, viscose filament is used as the raw material for carboxymethyl modification, and PTFE with high biocompatibility and inertness is used as the core yarn to ensure the integrity of the fabric structure after the viscose skin yarn absorbs and dissolves blood.

[0059] In an optional embodiment, the specification of the viscose filament is 75D - 600D, the number of spindles of the skin yarn is 4 or 8 or 16, and the mass ratio of the skin yarn in the viscose filament-PTFE woven yarn is 10% - 90%; the number of spindles of the skin yarn is an even number, half of the spindles rotate clockwise, and the other half rotate counterclockwise, and the spindles of the skin yarn form symmetric weaving; the specification of the PTFE sewing thread is 200D - 800D, and the number of core yarns is 1 - 4.

[0060] Furthermore, the weaving pitch is 0.1mm - 4mm; the diameter of the viscose filament-PTFE woven yarn is 0.5mm - 1.5cm.

[0061] Step S2: Alkalinize, etherify, acidify, and dry the viscose filament-PTFE woven yarn in sequence to obtain the modified viscose filament-PTFE woven yarn.

[0062] Specifically, the lye used in alkalization consists of NaOH and deionized water, the alkalization concentration is 22.5%-40%, the alkalization time is 5 min - 120 min, and the alkalization temperature is 15°C - 70°C. The etherifying agent used in etherification consists of NaOH, deionized water, monochloroacetic acid and absolute ethanol, or consists of NaOH, deionized water, monochloroacetic acid and isopropanol; the concentration of NaOH is 10%-18%, the concentration of monochloroacetic acid is 2.5%-12%, the etherification time is 0.5 h - 4 h, and the etherification temperature is 55°C - 80°C. The acidifying reagent used in acidification includes but is not limited to acetic acid or sulfuric acid.

[0063] In the embodiment of the present application, Coolmax with good wicking effect is used as the skin yarn, and nylon monofilament with good elastic recovery is used as the core yarn, ensuring that the spacer yarn of the wrapped yarn can quickly absorb blood and conduct it, accelerating hemostasis, and at the same time having good resilience when impacted by external objects, playing a role in protecting the wound.

[0064] Step S3: Using Coolmax as the skin yarn and nylon monofilament as the core yarn, perform wrapping on a high-speed knitting machine. The skin yarn is installed on the spindle and rotates for wrapping, and the core yarn is directly fed. After adjusting the knitting pitch of the skin yarn, a Coolmax-nylon monofilament wrapped yarn is knitted.

[0065] In an alternative embodiment, the specification of Coolmax is 75D - 150D, and the number of spindles of the skin yarn is an even number; the spindles of the skin yarn are all wrapped clockwise or counterclockwise to form a co-directional wrap; the diameter of the nylon monofilament is 0.1 mm - 0.25 mm, and the number of core yarns is 1 - 4.

[0066] Preferably, the knitting pitch is 0.5 mm - 2 mm; the diameter of the Coolmax-nylon monofilament wrapped yarn is 0.2 mm - 1 mm.

[0067] Step S4: Using the modified viscose filament-PTFE woven yarn as the inner and outer surface yarn, the Coolmax-nylon monofilament wrapped yarn as the spacer yarn, and ultra-high molecular weight polyethylene as the outer surface yarn, perform knitting on a flat knitting machine. After adjusting the number of needles spanned by the spacer yarn, a protective three-dimensional structure hemostatic textile spacer fabric is knitted.

[0068] In an alternative embodiment, 1 - 2 inner and outer surface yarns are fed, 1 - 4 spacer yarns are fed, and 2 - 8 outer surface yarns are fed; the specification of ultra-high molecular weight polyethylene is 300D - 600D, with 40 - 80 twists / m. The number of needles spanned by the spacer yarn is 2 or 4 or 6 or 8; the dpi value of the spacer yarn is 55 - 110.

[0069] It should be noted that the basic unit in the surface structure of the protective three-dimensional structured hemostatic textile spacer fabric consists of six rows. The surface structure includes an inner surface structure and an outer surface structure with consistent textures. The first row of the basic unit of the protective three-dimensional structured hemostatic textile spacer fabric is a full needle row. The second row is knitted at odd needle positions to achieve the effect of knitting with a one-needle interval. The third row is still knitted at odd needle positions to achieve the effect of knitting with a one-needle interval. The fourth row is a full needle row. The fifth row is knitted at even needle positions to achieve the effect of knitting with a one-needle interval. The sixth row is still knitted at even needle positions to achieve the effect of knitting with a one-needle interval. The surface structure of the protective three-dimensional structured hemostatic textile spacer fabric repeats this basic unit according to the fabric size. The surface structure stitch density value of the protective three-dimensional structured hemostatic textile spacer fabric is 80 - 120.

[0070] In summary, in the skin contact surface of the present application, the skin yarn and the core yarn of the carboxymethyl-modified viscose filament-PTFE braided yarn are braided together. However, after the skin yarn is dissolved, the core yarn structure remains intact, and the core yarn has good biocompatibility and high inertness, which is different from seaweed fiber-cotton blended yarn or chitosan-cotton blended yarn. Although the cotton yarn in the blended yarn also plays a role in structural support, it may lead to granulation tissue in the cotton yarn pores, causing secondary wound damage during replacement. The Coolmax-nylon monofilament wrapped yarn spacer filament provided in the present application has rapid core absorption of Coolmax to accelerate hemostasis, and the nylon monofilament provides elastic recovery and support force, which is different from the spacer filament composed of pure highly water-absorbent cotton, viscose, and tencel. It can only absorb a large amount of blood, but the fabric structure is tight, the gram weight is large, the spacer filament has no elasticity, the hemostasis effect is good, but the protective effect is weak. The protective three-dimensional structured hemostatic textile spacer fabric provided in the present application completes the basic surface structure through a row of full needles, and then increases the density by knitting with a one-needle interval to prevent the spacer filament from protruding from the surface pores, which is different from increasing the machine gauge to increase the density, enabling a complete structure of the spacer fabric to be formed even with coarser yarns. It meets the requirements of good biocompatibility and intact structure of the raw materials on the skin contact surface, good hygroscopicity and elastic recovery of the spacer filament, and good hydrophobic protection on the outer surface, achieving rapid hemostasis and strengthening the protective effect on the wound.

[0071] To better understand the present application, the following further illustrates the present application in conjunction with the accompanying drawings and two specific embodiments. It should be noted that the embodiments described in the specific embodiments are only a part of the embodiments of the present application and do not limit the scope of protection of the present application.

[0072] Embodiment 1

[0073] This embodiment provides a preparation method of a protective three-dimensional structured hemostatic textile spacer fabric, including the following steps:

[0074] Step S1, please refer to Figure 2, using 75D viscose filament as the skin yarn 2 and 3 pieces of 800D PTFE sewing thread as the core yarn 1, weaving on a high-speed knitting machine of model 90-16-1. The skin yarn 2 is installed on 8 spindles and rotates for weaving, and 1 piece of core yarn 1 is directly fed. Adjust the knitting pitch of the skin yarn 2 to 3 mm, and weave to obtain a viscose filament-PTFE woven yarn with a diameter of 0.5 mm, where the mass ratio of the skin yarn 2 in the viscose filament-PTFE woven yarn is 41%.

[0075] Step S2: Alkalize, etherify, acidify and dry the viscose filament-PTFE woven yarn in sequence to obtain the modified viscose filament-PTFE woven yarn; where the alkalization concentration is 30%, the alkalization time is 30 min, and the alkalization temperature is 40 °C; the etherifying agent used during etherification consists of 18% NaOH, deionized water, 5% monochloroacetic acid and absolute ethanol, the etherification time is 2 h, and the etherification temperature is 70 °C; in addition, the acidifying reagent used during acidification is acetic acid.

[0076] Step S3: Please refer to Figure 3 , using 75D Coolmax as the skin yarn 4 and a polyamide monofilament with a diameter of 0.2 mm as the core yarn 3, performing wrapping on a high-speed knitting machine of model 90-16-1. The skin yarn 4 is installed on 4 spindles and rotates for wrapping, and 1 piece of core yarn 3 is directly fed. After adjusting the knitting pitch of the skin yarn 4 to 2 mm, weave to obtain a Coolmax-polyamide monofilament wrapped yarn with a diameter of 0.356 mm.

[0077] Step S4: Please refer to Figure 4 , using the modified viscose filament-PTFE woven yarn as the inner and outer surface yarn 7, the Coolmax-polyamide monofilament wrapped yarn as the spacer yarn 6, and 4 pieces of 600D, 80 twists / m ultra-high molecular weight polyethylene as the outer surface yarn 5, performing weaving on a flat knitting machine of model 7. After adjusting the number of needles spanned by the spacer yarn, weave to obtain a protective three-dimensional structure hemostatic textile spacer fabric.

[0078] It should be noted that, please refer to Figure 5 , the basic unit in the surface structure of the protective three-dimensional structure hemostatic textile spacer fabric consists of six rows, and the surface structure includes a consistent inner surface structure and outer surface structure; in the first row of the basic unit of the protective three-dimensional structure hemostatic textile spacer fabric, full knitting is performed at all needle positions 8, in the second row, knitting is performed at odd needle positions 9 to achieve the effect of knitting with a one-needle interval, in the third row, knitting is still performed at odd needle positions 9 to achieve the effect of knitting with a one-needle interval, in the fourth row, full knitting is performed at all needle positions 8, in the fifth row, knitting is performed at even needle positions 11 to achieve the effect of knitting with a one-needle interval, in the sixth row, knitting is still performed at even needle positions 11 to achieve the effect of knitting with a one-needle interval; the surface structure of the protective three-dimensional structure hemostatic textile spacer fabric repeats this basic unit according to the fabric size.

[0079] In addition, the spacer yarn 6 is knitted at the stitch position 10 that spans 4 stitches each time. The stitch density values of the two surface tissues are 80, and the stitch density value of the spacer yarn 6 is 65. The thickness of the finally obtained protective three-dimensional structural hemostatic textile spacer fabric is 7.373 cm, and the grammage is 1448.24 g / m 2 , and the bulk weight is 0.196 g / cm 3 . The cyclic compressive stress is about 1.68 MPa, the air permeability is about 986.05 mm / s, and the moisture permeability is 1372.09 g / m 2 / day, the thermal resistance is 0.2659 m 2 K / W, and the percentage of blood absorption is 186.43%.

[0080] Example Two

[0081] This example provides another method for preparing a protective three-dimensional structural hemostatic textile spacer fabric, including the following steps:

[0082] Step S1, please refer to Figure 2 , use 75D viscose filament as the skin yarn 2 and 3 pieces of 800D PTFE sewing thread as the core yarn 1, and knit on a high-speed knitting machine of model 90-16-1. The skin yarn 2 is installed on 8 spindles and rotates for knitting, and 2 pieces of core yarn 1 are directly fed. Adjust the knitting pitch of the skin yarn 2 to 3 mm, and knit to obtain a viscose filament-PTFE knitting yarn with a diameter of 0.8 mm, where the mass ratio of the skin yarn 2 in the viscose filament-PTFE knitting yarn is 31%.

[0083] Step S2, successively perform alkalization, etherification, acidification, and drying on the viscose filament-PTFE knitting yarn to obtain a modified viscose filament-PTFE knitting yarn; the alkalization concentration is 30%, the alkalization time is 30 min, and the alkalization temperature is 40 °C; the etherifying agent used during etherification consists of 18% NaOH, deionized water, 5% monochloroacetic acid, and absolute ethanol, the etherification time is 2 h, and the etherification temperature is 70 °C; in addition, the acidifying reagent used during acidification is acetic acid.

[0084] Step S3, please refer to Figure 3 , use 75D Coolmax as the skin yarn 4 and a polyamide monofilament with a diameter of 0.2 mm as the core yarn 3, and perform wrapping on a high-speed knitting machine of model 90-16-1. The skin yarn 4 is installed on 4 spindles and rotates for wrapping, and 1 piece of core yarn 3 is directly fed. After adjusting the knitting pitch of the skin yarn 4 to 2 mm, knit to obtain a Coolmax-polyamide monofilament wrapped yarn with a diameter of 0.356 mm.

[0085] Step S4, please refer to Figure 4, using the modified viscose filament-PTFE braided yarn as the inner and outer yarn 7, the Coolmax-polyamide monofilament wrapped yarn as the spacer yarn 6, and 4 pieces of 600D, 80 twists / m ultra-high molecular weight polyethylene as the outer yarn 5, knitting on a flat knitting machine of model No. 7. After adjusting the number of needles spanned by the spacer yarn, a protective three-dimensional structured hemostatic textile spacer fabric is knitted.

[0086] It should be noted that, please refer to Figure 5 , the basic unit in the surface structure of the protective three-dimensional structured hemostatic textile spacer fabric consists of six rows. The surface structure includes an inner surface structure and an outer surface structure with consistent texture; the first row of the basic unit of the protective three-dimensional structured hemostatic textile spacer fabric is knitted with full needles at all needle positions 8, the second row is knitted at odd needle positions 9 to achieve the effect of knitting with a one-needle interval, the third row is still knitted at odd needle positions 9 to achieve the effect of knitting with a one-needle interval, the fourth row is knitted with full needles at all needle positions 8, the fifth row is knitted at even needle positions 11 to achieve the effect of knitting with a one-needle interval, and the sixth row is still knitted at even needle positions 11 to achieve the effect of knitting with a one-needle interval; the surface structure of the protective three-dimensional structured hemostatic textile spacer fabric repeats this basic unit according to the fabric size.

[0087] In addition, the spacer yarn 6 is knitted at the needle position 10 where it spans 4 needles each time. The stitch density values of the two surface structures are 80, and the stitch density value of the spacer yarn 6 is 65. The finally obtained protective three-dimensional structured hemostatic textile spacer fabric has a thickness of 6.592 cm and a gram weight of 1743.8 g / m 2 , and the bulk weight is 0.265 g / cm 3 . The cyclic compressive stress is about 1.57 MPa, the air permeability is about 924.94 mm / s, the moisture permeability is 1357.65 g / m 2 / day, the thermal resistance is 0.2123 m 2 K / W, and the percentage of absorbed blood is 177.14%.

[0088] The above are only the preferred embodiments of the present application. It should be pointed out that: for those of ordinary skill in the art of this technology, without departing from the principle of the present application, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present application.

Claims

1. A preparation method of a protective three-dimensional structure hemostatic textile spacer fabric, characterized in that, it includes the steps: S1. Using viscose filament as the first skin yarn and PTFE sewing thread as the first core yarn, weaving on a high-speed knitting machine. The first skin yarn is installed on the spindle and rotates for weaving, and the first core yarn is directly fed. After adjusting the knitting pitch of the first skin yarn, viscose filament-PTFE woven yarn is woven; S2. Alkalinizing, etherifying, acidifying and drying the viscose filament-PTFE woven yarn in sequence to obtain the modified viscose filament-PTFE woven yarn; S3. Using Coolmax as the second skin yarn and nylon monofilament as the second core yarn, wrapping on a high-speed knitting machine. The second skin yarn is installed on the spindle and rotates for wrapping, and the second core yarn is directly fed. After adjusting the knitting pitch of the second skin yarn, Coolmax-nylon monofilament wrapped yarn is woven; S4. Using the modified viscose filament-PTFE woven yarn as the inner and outer surface yarn, the Coolmax-nylon monofilament wrapped yarn as the spacer yarn, and ultra-high molecular weight polyethylene as the outer surface yarn, weaving on a flat knitting machine. After adjusting the number of needles spanned by the spacer yarn, a protective three-dimensional structure hemostatic textile spacer fabric is woven; In the step S4: The basic unit of the surface structure of the protective three-dimensional structure hemostatic textile spacer fabric consists of six rows, and the surface structure includes a consistent inner surface structure and an outer surface structure; The first row of the basic unit of the protective three-dimensional structure hemostatic textile spacer fabric is a full needle, the second row is woven at odd needle positions to achieve the effect of one needle spacing per one needle interval weaving, the third row is still woven at odd needle positions to achieve the effect of one needle spacing per one needle interval weaving, the fourth row is a full needle, the fifth row is woven at even needle positions to achieve the effect of one needle spacing per one needle interval weaving, and the sixth row is still woven at even needle positions to achieve the effect of one needle spacing per one needle interval weaving; The surface structure of the protective three-dimensional structure hemostatic textile spacer fabric repeats this basic unit according to the fabric size; The surface structure density value of the protective three-dimensional structure hemostatic textile spacer fabric is 80-120.

2. The preparation method of the protective three-dimensional structure hemostatic textile spacer fabric according to claim 1, characterized in that, in the step S1: The specification of the viscose filament is 75D-600D, the number of spindles of the first skin yarn is 4 or 8 or 16, and the mass ratio of the first skin yarn in the viscose filament-PTFE woven yarn is 10%-90%; The number of spindles of the first skin yarn is an even number, half of the spindles rotate clockwise and the other half rotate counterclockwise, and the spindles of the first skin yarn form symmetric weaving; The specification of the PTFE sewing thread is 200D-800D, and the number of the first core yarn is 1-4.

3. The preparation method of the protective three-dimensional structure hemostatic textile spacer fabric according to claim 1, characterized in that, in the step S1: The knitting pitch is 0.1mm-4mm; The diameter of the viscose filament-PTFE woven yarn is 0.5mm-1.5cm.

4. The preparation method of the protective three-dimensional structured hemostatic textile spacer fabric according to claim 1, characterized in that, in the step S2: the lye used in the alkalization consists of NaOH and deionized water, the alkalization concentration is 22.5%-40%, the alkalization time is 5 min - 120 min, and the alkalization temperature is 15°C - 70°C.

5. The preparation method of the protective three-dimensional structured hemostatic textile spacer fabric according to claim 1, characterized in that, in the step S2: the etherifying agent used in the etherification consists of NaOH, deionized water, monochloroacetic acid and absolute ethanol, or consists of NaOH, deionized water, monochloroacetic acid and isopropanol; the concentration of the NaOH is 10%-18%, the concentration of the monochloroacetic acid is 2.5%-12%, the etherification time is 0.5 h - 4 h, and the etherification temperature is 55°C - 80°C; the acidifying reagent used in the acidification includes acetic acid or sulfuric acid.

6. The preparation method of the protective three-dimensional structured hemostatic textile spacer fabric according to claim 1, characterized in that, in the step S3: the specification of the Coolmax is 75D - 150D, and the number of spindles of the second skin yarn is an even number; all the spindles of the second skin yarn are wrapped clockwise or counterclockwise to form a co-directional wrap; the diameter of the polyamide monofilament is 0.1 mm - 0.25 mm, and the number of the second core yarns is 1 - 4.

7. The preparation method of the protective three-dimensional structured hemostatic textile spacer fabric according to claim 1, characterized in that, in the step S3: the knitting pitch is 0.5 mm - 2 mm; the diameter of the Coolmax-polyamide monofilament wrapped yarn is 0.2 mm - 1 mm.

8. The preparation method of the protective three-dimensional structured hemostatic textile spacer fabric according to claim 1, characterized in that, in the step S4: 1 - 2 inner and outer surface yarns are fed in, 1 - 4 spacer filaments are fed in, and 2 - 8 outer surface yarns are fed in; the specification of the ultra-high molecular weight polyethylene is 300D - 600D, with 40 - 80 twists / m.

9. The preparation method of the protective three-dimensional structured hemostatic textile spacer fabric according to claim 1, characterized in that, in the step S4: the number of needles spanned by the spacer filament is 2 or 4 or 6 or 8; the dpi value of the spacer filament is 55 - 110.

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